11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * Generic hugetlb support. 36d49e352SNadia Yvette Chambers * (C) Nadia Yvette Chambers, April 2004 41da177e4SLinus Torvalds */ 51da177e4SLinus Torvalds #include <linux/list.h> 61da177e4SLinus Torvalds #include <linux/init.h> 71da177e4SLinus Torvalds #include <linux/mm.h> 8e1759c21SAlexey Dobriyan #include <linux/seq_file.h> 91da177e4SLinus Torvalds #include <linux/sysctl.h> 101da177e4SLinus Torvalds #include <linux/highmem.h> 11cddb8a5cSAndrea Arcangeli #include <linux/mmu_notifier.h> 121da177e4SLinus Torvalds #include <linux/nodemask.h> 1363551ae0SDavid Gibson #include <linux/pagemap.h> 145da7ca86SChristoph Lameter #include <linux/mempolicy.h> 153b32123dSGideon Israel Dsouza #include <linux/compiler.h> 16aea47ff3SChristoph Lameter #include <linux/cpuset.h> 173935baa9SDavid Gibson #include <linux/mutex.h> 18aa888a74SAndi Kleen #include <linux/bootmem.h> 19a3437870SNishanth Aravamudan #include <linux/sysfs.h> 205a0e3ad6STejun Heo #include <linux/slab.h> 210fe6e20bSNaoya Horiguchi #include <linux/rmap.h> 22fd6a03edSNaoya Horiguchi #include <linux/swap.h> 23fd6a03edSNaoya Horiguchi #include <linux/swapops.h> 24c8721bbbSNaoya Horiguchi #include <linux/page-isolation.h> 258382d914SDavidlohr Bueso #include <linux/jhash.h> 26d6606683SLinus Torvalds 2763551ae0SDavid Gibson #include <asm/page.h> 2863551ae0SDavid Gibson #include <asm/pgtable.h> 2924669e58SAneesh Kumar K.V #include <asm/tlb.h> 3063551ae0SDavid Gibson 3124669e58SAneesh Kumar K.V #include <linux/io.h> 3263551ae0SDavid Gibson #include <linux/hugetlb.h> 339dd540e2SAneesh Kumar K.V #include <linux/hugetlb_cgroup.h> 349a305230SLee Schermerhorn #include <linux/node.h> 357835e98bSNick Piggin #include "internal.h" 361da177e4SLinus Torvalds 37753162cdSAndrey Ryabinin int hugepages_treat_as_movable; 38a5516438SAndi Kleen 39c3f38a38SAneesh Kumar K.V int hugetlb_max_hstate __read_mostly; 40e5ff2159SAndi Kleen unsigned int default_hstate_idx; 41e5ff2159SAndi Kleen struct hstate hstates[HUGE_MAX_HSTATE]; 42641844f5SNaoya Horiguchi /* 43641844f5SNaoya Horiguchi * Minimum page order among possible hugepage sizes, set to a proper value 44641844f5SNaoya Horiguchi * at boot time. 45641844f5SNaoya Horiguchi */ 46641844f5SNaoya Horiguchi static unsigned int minimum_order __read_mostly = UINT_MAX; 47e5ff2159SAndi Kleen 4853ba51d2SJon Tollefson __initdata LIST_HEAD(huge_boot_pages); 4953ba51d2SJon Tollefson 50e5ff2159SAndi Kleen /* for command line parsing */ 51e5ff2159SAndi Kleen static struct hstate * __initdata parsed_hstate; 52e5ff2159SAndi Kleen static unsigned long __initdata default_hstate_max_huge_pages; 53e11bfbfcSNick Piggin static unsigned long __initdata default_hstate_size; 549fee021dSVaishali Thakkar static bool __initdata parsed_valid_hugepagesz = true; 55e5ff2159SAndi Kleen 563935baa9SDavid Gibson /* 5731caf665SNaoya Horiguchi * Protects updates to hugepage_freelists, hugepage_activelist, nr_huge_pages, 5831caf665SNaoya Horiguchi * free_huge_pages, and surplus_huge_pages. 593935baa9SDavid Gibson */ 60c3f38a38SAneesh Kumar K.V DEFINE_SPINLOCK(hugetlb_lock); 610bd0f9fbSEric Paris 628382d914SDavidlohr Bueso /* 638382d914SDavidlohr Bueso * Serializes faults on the same logical page. This is used to 648382d914SDavidlohr Bueso * prevent spurious OOMs when the hugepage pool is fully utilized. 658382d914SDavidlohr Bueso */ 668382d914SDavidlohr Bueso static int num_fault_mutexes; 67c672c7f2SMike Kravetz struct mutex *hugetlb_fault_mutex_table ____cacheline_aligned_in_smp; 688382d914SDavidlohr Bueso 697ca02d0aSMike Kravetz /* Forward declaration */ 707ca02d0aSMike Kravetz static int hugetlb_acct_memory(struct hstate *h, long delta); 717ca02d0aSMike Kravetz 7290481622SDavid Gibson static inline void unlock_or_release_subpool(struct hugepage_subpool *spool) 7390481622SDavid Gibson { 7490481622SDavid Gibson bool free = (spool->count == 0) && (spool->used_hpages == 0); 7590481622SDavid Gibson 7690481622SDavid Gibson spin_unlock(&spool->lock); 7790481622SDavid Gibson 7890481622SDavid Gibson /* If no pages are used, and no other handles to the subpool 797ca02d0aSMike Kravetz * remain, give up any reservations mased on minimum size and 807ca02d0aSMike Kravetz * free the subpool */ 817ca02d0aSMike Kravetz if (free) { 827ca02d0aSMike Kravetz if (spool->min_hpages != -1) 837ca02d0aSMike Kravetz hugetlb_acct_memory(spool->hstate, 847ca02d0aSMike Kravetz -spool->min_hpages); 8590481622SDavid Gibson kfree(spool); 8690481622SDavid Gibson } 877ca02d0aSMike Kravetz } 8890481622SDavid Gibson 897ca02d0aSMike Kravetz struct hugepage_subpool *hugepage_new_subpool(struct hstate *h, long max_hpages, 907ca02d0aSMike Kravetz long min_hpages) 9190481622SDavid Gibson { 9290481622SDavid Gibson struct hugepage_subpool *spool; 9390481622SDavid Gibson 94c6a91820SMike Kravetz spool = kzalloc(sizeof(*spool), GFP_KERNEL); 9590481622SDavid Gibson if (!spool) 9690481622SDavid Gibson return NULL; 9790481622SDavid Gibson 9890481622SDavid Gibson spin_lock_init(&spool->lock); 9990481622SDavid Gibson spool->count = 1; 1007ca02d0aSMike Kravetz spool->max_hpages = max_hpages; 1017ca02d0aSMike Kravetz spool->hstate = h; 1027ca02d0aSMike Kravetz spool->min_hpages = min_hpages; 1037ca02d0aSMike Kravetz 1047ca02d0aSMike Kravetz if (min_hpages != -1 && hugetlb_acct_memory(h, min_hpages)) { 1057ca02d0aSMike Kravetz kfree(spool); 1067ca02d0aSMike Kravetz return NULL; 1077ca02d0aSMike Kravetz } 1087ca02d0aSMike Kravetz spool->rsv_hpages = min_hpages; 10990481622SDavid Gibson 11090481622SDavid Gibson return spool; 11190481622SDavid Gibson } 11290481622SDavid Gibson 11390481622SDavid Gibson void hugepage_put_subpool(struct hugepage_subpool *spool) 11490481622SDavid Gibson { 11590481622SDavid Gibson spin_lock(&spool->lock); 11690481622SDavid Gibson BUG_ON(!spool->count); 11790481622SDavid Gibson spool->count--; 11890481622SDavid Gibson unlock_or_release_subpool(spool); 11990481622SDavid Gibson } 12090481622SDavid Gibson 1211c5ecae3SMike Kravetz /* 1221c5ecae3SMike Kravetz * Subpool accounting for allocating and reserving pages. 1231c5ecae3SMike Kravetz * Return -ENOMEM if there are not enough resources to satisfy the 1241c5ecae3SMike Kravetz * the request. Otherwise, return the number of pages by which the 1251c5ecae3SMike Kravetz * global pools must be adjusted (upward). The returned value may 1261c5ecae3SMike Kravetz * only be different than the passed value (delta) in the case where 1271c5ecae3SMike Kravetz * a subpool minimum size must be manitained. 1281c5ecae3SMike Kravetz */ 1291c5ecae3SMike Kravetz static long hugepage_subpool_get_pages(struct hugepage_subpool *spool, 13090481622SDavid Gibson long delta) 13190481622SDavid Gibson { 1321c5ecae3SMike Kravetz long ret = delta; 13390481622SDavid Gibson 13490481622SDavid Gibson if (!spool) 1351c5ecae3SMike Kravetz return ret; 13690481622SDavid Gibson 13790481622SDavid Gibson spin_lock(&spool->lock); 13890481622SDavid Gibson 1391c5ecae3SMike Kravetz if (spool->max_hpages != -1) { /* maximum size accounting */ 1401c5ecae3SMike Kravetz if ((spool->used_hpages + delta) <= spool->max_hpages) 1411c5ecae3SMike Kravetz spool->used_hpages += delta; 1421c5ecae3SMike Kravetz else { 1431c5ecae3SMike Kravetz ret = -ENOMEM; 1441c5ecae3SMike Kravetz goto unlock_ret; 1451c5ecae3SMike Kravetz } 1461c5ecae3SMike Kravetz } 1471c5ecae3SMike Kravetz 14809a95e29SMike Kravetz /* minimum size accounting */ 14909a95e29SMike Kravetz if (spool->min_hpages != -1 && spool->rsv_hpages) { 1501c5ecae3SMike Kravetz if (delta > spool->rsv_hpages) { 1511c5ecae3SMike Kravetz /* 1521c5ecae3SMike Kravetz * Asking for more reserves than those already taken on 1531c5ecae3SMike Kravetz * behalf of subpool. Return difference. 1541c5ecae3SMike Kravetz */ 1551c5ecae3SMike Kravetz ret = delta - spool->rsv_hpages; 1561c5ecae3SMike Kravetz spool->rsv_hpages = 0; 1571c5ecae3SMike Kravetz } else { 1581c5ecae3SMike Kravetz ret = 0; /* reserves already accounted for */ 1591c5ecae3SMike Kravetz spool->rsv_hpages -= delta; 1601c5ecae3SMike Kravetz } 1611c5ecae3SMike Kravetz } 1621c5ecae3SMike Kravetz 1631c5ecae3SMike Kravetz unlock_ret: 1641c5ecae3SMike Kravetz spin_unlock(&spool->lock); 16590481622SDavid Gibson return ret; 16690481622SDavid Gibson } 16790481622SDavid Gibson 1681c5ecae3SMike Kravetz /* 1691c5ecae3SMike Kravetz * Subpool accounting for freeing and unreserving pages. 1701c5ecae3SMike Kravetz * Return the number of global page reservations that must be dropped. 1711c5ecae3SMike Kravetz * The return value may only be different than the passed value (delta) 1721c5ecae3SMike Kravetz * in the case where a subpool minimum size must be maintained. 1731c5ecae3SMike Kravetz */ 1741c5ecae3SMike Kravetz static long hugepage_subpool_put_pages(struct hugepage_subpool *spool, 17590481622SDavid Gibson long delta) 17690481622SDavid Gibson { 1771c5ecae3SMike Kravetz long ret = delta; 1781c5ecae3SMike Kravetz 17990481622SDavid Gibson if (!spool) 1801c5ecae3SMike Kravetz return delta; 18190481622SDavid Gibson 18290481622SDavid Gibson spin_lock(&spool->lock); 1831c5ecae3SMike Kravetz 1841c5ecae3SMike Kravetz if (spool->max_hpages != -1) /* maximum size accounting */ 18590481622SDavid Gibson spool->used_hpages -= delta; 1861c5ecae3SMike Kravetz 18709a95e29SMike Kravetz /* minimum size accounting */ 18809a95e29SMike Kravetz if (spool->min_hpages != -1 && spool->used_hpages < spool->min_hpages) { 1891c5ecae3SMike Kravetz if (spool->rsv_hpages + delta <= spool->min_hpages) 1901c5ecae3SMike Kravetz ret = 0; 1911c5ecae3SMike Kravetz else 1921c5ecae3SMike Kravetz ret = spool->rsv_hpages + delta - spool->min_hpages; 1931c5ecae3SMike Kravetz 1941c5ecae3SMike Kravetz spool->rsv_hpages += delta; 1951c5ecae3SMike Kravetz if (spool->rsv_hpages > spool->min_hpages) 1961c5ecae3SMike Kravetz spool->rsv_hpages = spool->min_hpages; 1971c5ecae3SMike Kravetz } 1981c5ecae3SMike Kravetz 1991c5ecae3SMike Kravetz /* 2001c5ecae3SMike Kravetz * If hugetlbfs_put_super couldn't free spool due to an outstanding 2011c5ecae3SMike Kravetz * quota reference, free it now. 2021c5ecae3SMike Kravetz */ 20390481622SDavid Gibson unlock_or_release_subpool(spool); 2041c5ecae3SMike Kravetz 2051c5ecae3SMike Kravetz return ret; 20690481622SDavid Gibson } 20790481622SDavid Gibson 20890481622SDavid Gibson static inline struct hugepage_subpool *subpool_inode(struct inode *inode) 20990481622SDavid Gibson { 21090481622SDavid Gibson return HUGETLBFS_SB(inode->i_sb)->spool; 21190481622SDavid Gibson } 21290481622SDavid Gibson 21390481622SDavid Gibson static inline struct hugepage_subpool *subpool_vma(struct vm_area_struct *vma) 21490481622SDavid Gibson { 215496ad9aaSAl Viro return subpool_inode(file_inode(vma->vm_file)); 21690481622SDavid Gibson } 21790481622SDavid Gibson 218e7c4b0bfSAndy Whitcroft /* 21996822904SAndy Whitcroft * Region tracking -- allows tracking of reservations and instantiated pages 22096822904SAndy Whitcroft * across the pages in a mapping. 22184afd99bSAndy Whitcroft * 2221dd308a7SMike Kravetz * The region data structures are embedded into a resv_map and protected 2231dd308a7SMike Kravetz * by a resv_map's lock. The set of regions within the resv_map represent 2241dd308a7SMike Kravetz * reservations for huge pages, or huge pages that have already been 2251dd308a7SMike Kravetz * instantiated within the map. The from and to elements are huge page 2261dd308a7SMike Kravetz * indicies into the associated mapping. from indicates the starting index 2271dd308a7SMike Kravetz * of the region. to represents the first index past the end of the region. 2281dd308a7SMike Kravetz * 2291dd308a7SMike Kravetz * For example, a file region structure with from == 0 and to == 4 represents 2301dd308a7SMike Kravetz * four huge pages in a mapping. It is important to note that the to element 2311dd308a7SMike Kravetz * represents the first element past the end of the region. This is used in 2321dd308a7SMike Kravetz * arithmetic as 4(to) - 0(from) = 4 huge pages in the region. 2331dd308a7SMike Kravetz * 2341dd308a7SMike Kravetz * Interval notation of the form [from, to) will be used to indicate that 2351dd308a7SMike Kravetz * the endpoint from is inclusive and to is exclusive. 23696822904SAndy Whitcroft */ 23796822904SAndy Whitcroft struct file_region { 23896822904SAndy Whitcroft struct list_head link; 23996822904SAndy Whitcroft long from; 24096822904SAndy Whitcroft long to; 24196822904SAndy Whitcroft }; 24296822904SAndy Whitcroft 2431dd308a7SMike Kravetz /* 2441dd308a7SMike Kravetz * Add the huge page range represented by [f, t) to the reserve 2455e911373SMike Kravetz * map. In the normal case, existing regions will be expanded 2465e911373SMike Kravetz * to accommodate the specified range. Sufficient regions should 2475e911373SMike Kravetz * exist for expansion due to the previous call to region_chg 2485e911373SMike Kravetz * with the same range. However, it is possible that region_del 2495e911373SMike Kravetz * could have been called after region_chg and modifed the map 2505e911373SMike Kravetz * in such a way that no region exists to be expanded. In this 2515e911373SMike Kravetz * case, pull a region descriptor from the cache associated with 2525e911373SMike Kravetz * the map and use that for the new range. 253cf3ad20bSMike Kravetz * 254cf3ad20bSMike Kravetz * Return the number of new huge pages added to the map. This 255cf3ad20bSMike Kravetz * number is greater than or equal to zero. 2561dd308a7SMike Kravetz */ 2571406ec9bSJoonsoo Kim static long region_add(struct resv_map *resv, long f, long t) 25896822904SAndy Whitcroft { 2591406ec9bSJoonsoo Kim struct list_head *head = &resv->regions; 26096822904SAndy Whitcroft struct file_region *rg, *nrg, *trg; 261cf3ad20bSMike Kravetz long add = 0; 26296822904SAndy Whitcroft 2637b24d861SDavidlohr Bueso spin_lock(&resv->lock); 26496822904SAndy Whitcroft /* Locate the region we are either in or before. */ 26596822904SAndy Whitcroft list_for_each_entry(rg, head, link) 26696822904SAndy Whitcroft if (f <= rg->to) 26796822904SAndy Whitcroft break; 26896822904SAndy Whitcroft 2695e911373SMike Kravetz /* 2705e911373SMike Kravetz * If no region exists which can be expanded to include the 2715e911373SMike Kravetz * specified range, the list must have been modified by an 2725e911373SMike Kravetz * interleving call to region_del(). Pull a region descriptor 2735e911373SMike Kravetz * from the cache and use it for this range. 2745e911373SMike Kravetz */ 2755e911373SMike Kravetz if (&rg->link == head || t < rg->from) { 2765e911373SMike Kravetz VM_BUG_ON(resv->region_cache_count <= 0); 2775e911373SMike Kravetz 2785e911373SMike Kravetz resv->region_cache_count--; 2795e911373SMike Kravetz nrg = list_first_entry(&resv->region_cache, struct file_region, 2805e911373SMike Kravetz link); 2815e911373SMike Kravetz list_del(&nrg->link); 2825e911373SMike Kravetz 2835e911373SMike Kravetz nrg->from = f; 2845e911373SMike Kravetz nrg->to = t; 2855e911373SMike Kravetz list_add(&nrg->link, rg->link.prev); 2865e911373SMike Kravetz 2875e911373SMike Kravetz add += t - f; 2885e911373SMike Kravetz goto out_locked; 2895e911373SMike Kravetz } 2905e911373SMike Kravetz 29196822904SAndy Whitcroft /* Round our left edge to the current segment if it encloses us. */ 29296822904SAndy Whitcroft if (f > rg->from) 29396822904SAndy Whitcroft f = rg->from; 29496822904SAndy Whitcroft 29596822904SAndy Whitcroft /* Check for and consume any regions we now overlap with. */ 29696822904SAndy Whitcroft nrg = rg; 29796822904SAndy Whitcroft list_for_each_entry_safe(rg, trg, rg->link.prev, link) { 29896822904SAndy Whitcroft if (&rg->link == head) 29996822904SAndy Whitcroft break; 30096822904SAndy Whitcroft if (rg->from > t) 30196822904SAndy Whitcroft break; 30296822904SAndy Whitcroft 30396822904SAndy Whitcroft /* If this area reaches higher then extend our area to 30496822904SAndy Whitcroft * include it completely. If this is not the first area 30596822904SAndy Whitcroft * which we intend to reuse, free it. */ 30696822904SAndy Whitcroft if (rg->to > t) 30796822904SAndy Whitcroft t = rg->to; 30896822904SAndy Whitcroft if (rg != nrg) { 309cf3ad20bSMike Kravetz /* Decrement return value by the deleted range. 310cf3ad20bSMike Kravetz * Another range will span this area so that by 311cf3ad20bSMike Kravetz * end of routine add will be >= zero 312cf3ad20bSMike Kravetz */ 313cf3ad20bSMike Kravetz add -= (rg->to - rg->from); 31496822904SAndy Whitcroft list_del(&rg->link); 31596822904SAndy Whitcroft kfree(rg); 31696822904SAndy Whitcroft } 31796822904SAndy Whitcroft } 318cf3ad20bSMike Kravetz 319cf3ad20bSMike Kravetz add += (nrg->from - f); /* Added to beginning of region */ 32096822904SAndy Whitcroft nrg->from = f; 321cf3ad20bSMike Kravetz add += t - nrg->to; /* Added to end of region */ 32296822904SAndy Whitcroft nrg->to = t; 323cf3ad20bSMike Kravetz 3245e911373SMike Kravetz out_locked: 3255e911373SMike Kravetz resv->adds_in_progress--; 3267b24d861SDavidlohr Bueso spin_unlock(&resv->lock); 327cf3ad20bSMike Kravetz VM_BUG_ON(add < 0); 328cf3ad20bSMike Kravetz return add; 32996822904SAndy Whitcroft } 33096822904SAndy Whitcroft 3311dd308a7SMike Kravetz /* 3321dd308a7SMike Kravetz * Examine the existing reserve map and determine how many 3331dd308a7SMike Kravetz * huge pages in the specified range [f, t) are NOT currently 3341dd308a7SMike Kravetz * represented. This routine is called before a subsequent 3351dd308a7SMike Kravetz * call to region_add that will actually modify the reserve 3361dd308a7SMike Kravetz * map to add the specified range [f, t). region_chg does 3371dd308a7SMike Kravetz * not change the number of huge pages represented by the 3381dd308a7SMike Kravetz * map. However, if the existing regions in the map can not 3391dd308a7SMike Kravetz * be expanded to represent the new range, a new file_region 3401dd308a7SMike Kravetz * structure is added to the map as a placeholder. This is 3411dd308a7SMike Kravetz * so that the subsequent region_add call will have all the 3421dd308a7SMike Kravetz * regions it needs and will not fail. 3431dd308a7SMike Kravetz * 3445e911373SMike Kravetz * Upon entry, region_chg will also examine the cache of region descriptors 3455e911373SMike Kravetz * associated with the map. If there are not enough descriptors cached, one 3465e911373SMike Kravetz * will be allocated for the in progress add operation. 3475e911373SMike Kravetz * 3485e911373SMike Kravetz * Returns the number of huge pages that need to be added to the existing 3495e911373SMike Kravetz * reservation map for the range [f, t). This number is greater or equal to 3505e911373SMike Kravetz * zero. -ENOMEM is returned if a new file_region structure or cache entry 3515e911373SMike Kravetz * is needed and can not be allocated. 3521dd308a7SMike Kravetz */ 3531406ec9bSJoonsoo Kim static long region_chg(struct resv_map *resv, long f, long t) 35496822904SAndy Whitcroft { 3551406ec9bSJoonsoo Kim struct list_head *head = &resv->regions; 3567b24d861SDavidlohr Bueso struct file_region *rg, *nrg = NULL; 35796822904SAndy Whitcroft long chg = 0; 35896822904SAndy Whitcroft 3597b24d861SDavidlohr Bueso retry: 3607b24d861SDavidlohr Bueso spin_lock(&resv->lock); 3615e911373SMike Kravetz retry_locked: 3625e911373SMike Kravetz resv->adds_in_progress++; 3635e911373SMike Kravetz 3645e911373SMike Kravetz /* 3655e911373SMike Kravetz * Check for sufficient descriptors in the cache to accommodate 3665e911373SMike Kravetz * the number of in progress add operations. 3675e911373SMike Kravetz */ 3685e911373SMike Kravetz if (resv->adds_in_progress > resv->region_cache_count) { 3695e911373SMike Kravetz struct file_region *trg; 3705e911373SMike Kravetz 3715e911373SMike Kravetz VM_BUG_ON(resv->adds_in_progress - resv->region_cache_count > 1); 3725e911373SMike Kravetz /* Must drop lock to allocate a new descriptor. */ 3735e911373SMike Kravetz resv->adds_in_progress--; 3745e911373SMike Kravetz spin_unlock(&resv->lock); 3755e911373SMike Kravetz 3765e911373SMike Kravetz trg = kmalloc(sizeof(*trg), GFP_KERNEL); 377dbe409e4SMike Kravetz if (!trg) { 378dbe409e4SMike Kravetz kfree(nrg); 3795e911373SMike Kravetz return -ENOMEM; 380dbe409e4SMike Kravetz } 3815e911373SMike Kravetz 3825e911373SMike Kravetz spin_lock(&resv->lock); 3835e911373SMike Kravetz list_add(&trg->link, &resv->region_cache); 3845e911373SMike Kravetz resv->region_cache_count++; 3855e911373SMike Kravetz goto retry_locked; 3865e911373SMike Kravetz } 3875e911373SMike Kravetz 38896822904SAndy Whitcroft /* Locate the region we are before or in. */ 38996822904SAndy Whitcroft list_for_each_entry(rg, head, link) 39096822904SAndy Whitcroft if (f <= rg->to) 39196822904SAndy Whitcroft break; 39296822904SAndy Whitcroft 39396822904SAndy Whitcroft /* If we are below the current region then a new region is required. 39496822904SAndy Whitcroft * Subtle, allocate a new region at the position but make it zero 39596822904SAndy Whitcroft * size such that we can guarantee to record the reservation. */ 39696822904SAndy Whitcroft if (&rg->link == head || t < rg->from) { 3977b24d861SDavidlohr Bueso if (!nrg) { 3985e911373SMike Kravetz resv->adds_in_progress--; 3997b24d861SDavidlohr Bueso spin_unlock(&resv->lock); 40096822904SAndy Whitcroft nrg = kmalloc(sizeof(*nrg), GFP_KERNEL); 40196822904SAndy Whitcroft if (!nrg) 40296822904SAndy Whitcroft return -ENOMEM; 4037b24d861SDavidlohr Bueso 40496822904SAndy Whitcroft nrg->from = f; 40596822904SAndy Whitcroft nrg->to = f; 40696822904SAndy Whitcroft INIT_LIST_HEAD(&nrg->link); 4077b24d861SDavidlohr Bueso goto retry; 4087b24d861SDavidlohr Bueso } 40996822904SAndy Whitcroft 4107b24d861SDavidlohr Bueso list_add(&nrg->link, rg->link.prev); 4117b24d861SDavidlohr Bueso chg = t - f; 4127b24d861SDavidlohr Bueso goto out_nrg; 41396822904SAndy Whitcroft } 41496822904SAndy Whitcroft 41596822904SAndy Whitcroft /* Round our left edge to the current segment if it encloses us. */ 41696822904SAndy Whitcroft if (f > rg->from) 41796822904SAndy Whitcroft f = rg->from; 41896822904SAndy Whitcroft chg = t - f; 41996822904SAndy Whitcroft 42096822904SAndy Whitcroft /* Check for and consume any regions we now overlap with. */ 42196822904SAndy Whitcroft list_for_each_entry(rg, rg->link.prev, link) { 42296822904SAndy Whitcroft if (&rg->link == head) 42396822904SAndy Whitcroft break; 42496822904SAndy Whitcroft if (rg->from > t) 4257b24d861SDavidlohr Bueso goto out; 42696822904SAndy Whitcroft 42725985edcSLucas De Marchi /* We overlap with this area, if it extends further than 42896822904SAndy Whitcroft * us then we must extend ourselves. Account for its 42996822904SAndy Whitcroft * existing reservation. */ 43096822904SAndy Whitcroft if (rg->to > t) { 43196822904SAndy Whitcroft chg += rg->to - t; 43296822904SAndy Whitcroft t = rg->to; 43396822904SAndy Whitcroft } 43496822904SAndy Whitcroft chg -= rg->to - rg->from; 43596822904SAndy Whitcroft } 4367b24d861SDavidlohr Bueso 4377b24d861SDavidlohr Bueso out: 4387b24d861SDavidlohr Bueso spin_unlock(&resv->lock); 4397b24d861SDavidlohr Bueso /* We already know we raced and no longer need the new region */ 4407b24d861SDavidlohr Bueso kfree(nrg); 4417b24d861SDavidlohr Bueso return chg; 4427b24d861SDavidlohr Bueso out_nrg: 4437b24d861SDavidlohr Bueso spin_unlock(&resv->lock); 44496822904SAndy Whitcroft return chg; 44596822904SAndy Whitcroft } 44696822904SAndy Whitcroft 4471dd308a7SMike Kravetz /* 4485e911373SMike Kravetz * Abort the in progress add operation. The adds_in_progress field 4495e911373SMike Kravetz * of the resv_map keeps track of the operations in progress between 4505e911373SMike Kravetz * calls to region_chg and region_add. Operations are sometimes 4515e911373SMike Kravetz * aborted after the call to region_chg. In such cases, region_abort 4525e911373SMike Kravetz * is called to decrement the adds_in_progress counter. 4535e911373SMike Kravetz * 4545e911373SMike Kravetz * NOTE: The range arguments [f, t) are not needed or used in this 4555e911373SMike Kravetz * routine. They are kept to make reading the calling code easier as 4565e911373SMike Kravetz * arguments will match the associated region_chg call. 4575e911373SMike Kravetz */ 4585e911373SMike Kravetz static void region_abort(struct resv_map *resv, long f, long t) 4595e911373SMike Kravetz { 4605e911373SMike Kravetz spin_lock(&resv->lock); 4615e911373SMike Kravetz VM_BUG_ON(!resv->region_cache_count); 4625e911373SMike Kravetz resv->adds_in_progress--; 4635e911373SMike Kravetz spin_unlock(&resv->lock); 4645e911373SMike Kravetz } 4655e911373SMike Kravetz 4665e911373SMike Kravetz /* 467feba16e2SMike Kravetz * Delete the specified range [f, t) from the reserve map. If the 468feba16e2SMike Kravetz * t parameter is LONG_MAX, this indicates that ALL regions after f 469feba16e2SMike Kravetz * should be deleted. Locate the regions which intersect [f, t) 470feba16e2SMike Kravetz * and either trim, delete or split the existing regions. 471feba16e2SMike Kravetz * 472feba16e2SMike Kravetz * Returns the number of huge pages deleted from the reserve map. 473feba16e2SMike Kravetz * In the normal case, the return value is zero or more. In the 474feba16e2SMike Kravetz * case where a region must be split, a new region descriptor must 475feba16e2SMike Kravetz * be allocated. If the allocation fails, -ENOMEM will be returned. 476feba16e2SMike Kravetz * NOTE: If the parameter t == LONG_MAX, then we will never split 477feba16e2SMike Kravetz * a region and possibly return -ENOMEM. Callers specifying 478feba16e2SMike Kravetz * t == LONG_MAX do not need to check for -ENOMEM error. 4791dd308a7SMike Kravetz */ 480feba16e2SMike Kravetz static long region_del(struct resv_map *resv, long f, long t) 48196822904SAndy Whitcroft { 4821406ec9bSJoonsoo Kim struct list_head *head = &resv->regions; 48396822904SAndy Whitcroft struct file_region *rg, *trg; 484feba16e2SMike Kravetz struct file_region *nrg = NULL; 485feba16e2SMike Kravetz long del = 0; 48696822904SAndy Whitcroft 487feba16e2SMike Kravetz retry: 4887b24d861SDavidlohr Bueso spin_lock(&resv->lock); 489feba16e2SMike Kravetz list_for_each_entry_safe(rg, trg, head, link) { 490dbe409e4SMike Kravetz /* 491dbe409e4SMike Kravetz * Skip regions before the range to be deleted. file_region 492dbe409e4SMike Kravetz * ranges are normally of the form [from, to). However, there 493dbe409e4SMike Kravetz * may be a "placeholder" entry in the map which is of the form 494dbe409e4SMike Kravetz * (from, to) with from == to. Check for placeholder entries 495dbe409e4SMike Kravetz * at the beginning of the range to be deleted. 496dbe409e4SMike Kravetz */ 497dbe409e4SMike Kravetz if (rg->to <= f && (rg->to != rg->from || rg->to != f)) 498feba16e2SMike Kravetz continue; 499dbe409e4SMike Kravetz 500feba16e2SMike Kravetz if (rg->from >= t) 50196822904SAndy Whitcroft break; 50296822904SAndy Whitcroft 503feba16e2SMike Kravetz if (f > rg->from && t < rg->to) { /* Must split region */ 504feba16e2SMike Kravetz /* 505feba16e2SMike Kravetz * Check for an entry in the cache before dropping 506feba16e2SMike Kravetz * lock and attempting allocation. 507feba16e2SMike Kravetz */ 508feba16e2SMike Kravetz if (!nrg && 509feba16e2SMike Kravetz resv->region_cache_count > resv->adds_in_progress) { 510feba16e2SMike Kravetz nrg = list_first_entry(&resv->region_cache, 511feba16e2SMike Kravetz struct file_region, 512feba16e2SMike Kravetz link); 513feba16e2SMike Kravetz list_del(&nrg->link); 514feba16e2SMike Kravetz resv->region_cache_count--; 51596822904SAndy Whitcroft } 51696822904SAndy Whitcroft 517feba16e2SMike Kravetz if (!nrg) { 518feba16e2SMike Kravetz spin_unlock(&resv->lock); 519feba16e2SMike Kravetz nrg = kmalloc(sizeof(*nrg), GFP_KERNEL); 520feba16e2SMike Kravetz if (!nrg) 521feba16e2SMike Kravetz return -ENOMEM; 522feba16e2SMike Kravetz goto retry; 523feba16e2SMike Kravetz } 524feba16e2SMike Kravetz 525feba16e2SMike Kravetz del += t - f; 526feba16e2SMike Kravetz 527feba16e2SMike Kravetz /* New entry for end of split region */ 528feba16e2SMike Kravetz nrg->from = t; 529feba16e2SMike Kravetz nrg->to = rg->to; 530feba16e2SMike Kravetz INIT_LIST_HEAD(&nrg->link); 531feba16e2SMike Kravetz 532feba16e2SMike Kravetz /* Original entry is trimmed */ 533feba16e2SMike Kravetz rg->to = f; 534feba16e2SMike Kravetz 535feba16e2SMike Kravetz list_add(&nrg->link, &rg->link); 536feba16e2SMike Kravetz nrg = NULL; 53796822904SAndy Whitcroft break; 538feba16e2SMike Kravetz } 539feba16e2SMike Kravetz 540feba16e2SMike Kravetz if (f <= rg->from && t >= rg->to) { /* Remove entire region */ 541feba16e2SMike Kravetz del += rg->to - rg->from; 54296822904SAndy Whitcroft list_del(&rg->link); 54396822904SAndy Whitcroft kfree(rg); 544feba16e2SMike Kravetz continue; 54596822904SAndy Whitcroft } 5467b24d861SDavidlohr Bueso 547feba16e2SMike Kravetz if (f <= rg->from) { /* Trim beginning of region */ 548feba16e2SMike Kravetz del += t - rg->from; 549feba16e2SMike Kravetz rg->from = t; 550feba16e2SMike Kravetz } else { /* Trim end of region */ 551feba16e2SMike Kravetz del += rg->to - f; 552feba16e2SMike Kravetz rg->to = f; 553feba16e2SMike Kravetz } 554feba16e2SMike Kravetz } 555feba16e2SMike Kravetz 5567b24d861SDavidlohr Bueso spin_unlock(&resv->lock); 557feba16e2SMike Kravetz kfree(nrg); 558feba16e2SMike Kravetz return del; 55996822904SAndy Whitcroft } 56096822904SAndy Whitcroft 5611dd308a7SMike Kravetz /* 562b5cec28dSMike Kravetz * A rare out of memory error was encountered which prevented removal of 563b5cec28dSMike Kravetz * the reserve map region for a page. The huge page itself was free'ed 564b5cec28dSMike Kravetz * and removed from the page cache. This routine will adjust the subpool 565b5cec28dSMike Kravetz * usage count, and the global reserve count if needed. By incrementing 566b5cec28dSMike Kravetz * these counts, the reserve map entry which could not be deleted will 567b5cec28dSMike Kravetz * appear as a "reserved" entry instead of simply dangling with incorrect 568b5cec28dSMike Kravetz * counts. 569b5cec28dSMike Kravetz */ 570b5cec28dSMike Kravetz void hugetlb_fix_reserve_counts(struct inode *inode, bool restore_reserve) 571b5cec28dSMike Kravetz { 572b5cec28dSMike Kravetz struct hugepage_subpool *spool = subpool_inode(inode); 573b5cec28dSMike Kravetz long rsv_adjust; 574b5cec28dSMike Kravetz 575b5cec28dSMike Kravetz rsv_adjust = hugepage_subpool_get_pages(spool, 1); 576b5cec28dSMike Kravetz if (restore_reserve && rsv_adjust) { 577b5cec28dSMike Kravetz struct hstate *h = hstate_inode(inode); 578b5cec28dSMike Kravetz 579b5cec28dSMike Kravetz hugetlb_acct_memory(h, 1); 580b5cec28dSMike Kravetz } 581b5cec28dSMike Kravetz } 582b5cec28dSMike Kravetz 583b5cec28dSMike Kravetz /* 5841dd308a7SMike Kravetz * Count and return the number of huge pages in the reserve map 5851dd308a7SMike Kravetz * that intersect with the range [f, t). 5861dd308a7SMike Kravetz */ 5871406ec9bSJoonsoo Kim static long region_count(struct resv_map *resv, long f, long t) 58884afd99bSAndy Whitcroft { 5891406ec9bSJoonsoo Kim struct list_head *head = &resv->regions; 59084afd99bSAndy Whitcroft struct file_region *rg; 59184afd99bSAndy Whitcroft long chg = 0; 59284afd99bSAndy Whitcroft 5937b24d861SDavidlohr Bueso spin_lock(&resv->lock); 59484afd99bSAndy Whitcroft /* Locate each segment we overlap with, and count that overlap. */ 59584afd99bSAndy Whitcroft list_for_each_entry(rg, head, link) { 596f2135a4aSWang Sheng-Hui long seg_from; 597f2135a4aSWang Sheng-Hui long seg_to; 59884afd99bSAndy Whitcroft 59984afd99bSAndy Whitcroft if (rg->to <= f) 60084afd99bSAndy Whitcroft continue; 60184afd99bSAndy Whitcroft if (rg->from >= t) 60284afd99bSAndy Whitcroft break; 60384afd99bSAndy Whitcroft 60484afd99bSAndy Whitcroft seg_from = max(rg->from, f); 60584afd99bSAndy Whitcroft seg_to = min(rg->to, t); 60684afd99bSAndy Whitcroft 60784afd99bSAndy Whitcroft chg += seg_to - seg_from; 60884afd99bSAndy Whitcroft } 6097b24d861SDavidlohr Bueso spin_unlock(&resv->lock); 61084afd99bSAndy Whitcroft 61184afd99bSAndy Whitcroft return chg; 61284afd99bSAndy Whitcroft } 61384afd99bSAndy Whitcroft 61496822904SAndy Whitcroft /* 615e7c4b0bfSAndy Whitcroft * Convert the address within this vma to the page offset within 616e7c4b0bfSAndy Whitcroft * the mapping, in pagecache page units; huge pages here. 617e7c4b0bfSAndy Whitcroft */ 618a5516438SAndi Kleen static pgoff_t vma_hugecache_offset(struct hstate *h, 619a5516438SAndi Kleen struct vm_area_struct *vma, unsigned long address) 620e7c4b0bfSAndy Whitcroft { 621a5516438SAndi Kleen return ((address - vma->vm_start) >> huge_page_shift(h)) + 622a5516438SAndi Kleen (vma->vm_pgoff >> huge_page_order(h)); 623e7c4b0bfSAndy Whitcroft } 624e7c4b0bfSAndy Whitcroft 6250fe6e20bSNaoya Horiguchi pgoff_t linear_hugepage_index(struct vm_area_struct *vma, 6260fe6e20bSNaoya Horiguchi unsigned long address) 6270fe6e20bSNaoya Horiguchi { 6280fe6e20bSNaoya Horiguchi return vma_hugecache_offset(hstate_vma(vma), vma, address); 6290fe6e20bSNaoya Horiguchi } 6300fe6e20bSNaoya Horiguchi 63184afd99bSAndy Whitcroft /* 63208fba699SMel Gorman * Return the size of the pages allocated when backing a VMA. In the majority 63308fba699SMel Gorman * cases this will be same size as used by the page table entries. 63408fba699SMel Gorman */ 63508fba699SMel Gorman unsigned long vma_kernel_pagesize(struct vm_area_struct *vma) 63608fba699SMel Gorman { 63708fba699SMel Gorman struct hstate *hstate; 63808fba699SMel Gorman 63908fba699SMel Gorman if (!is_vm_hugetlb_page(vma)) 64008fba699SMel Gorman return PAGE_SIZE; 64108fba699SMel Gorman 64208fba699SMel Gorman hstate = hstate_vma(vma); 64308fba699SMel Gorman 6442415cf12SWanpeng Li return 1UL << huge_page_shift(hstate); 64508fba699SMel Gorman } 646f340ca0fSJoerg Roedel EXPORT_SYMBOL_GPL(vma_kernel_pagesize); 64708fba699SMel Gorman 64808fba699SMel Gorman /* 6493340289dSMel Gorman * Return the page size being used by the MMU to back a VMA. In the majority 6503340289dSMel Gorman * of cases, the page size used by the kernel matches the MMU size. On 6513340289dSMel Gorman * architectures where it differs, an architecture-specific version of this 6523340289dSMel Gorman * function is required. 6533340289dSMel Gorman */ 6543340289dSMel Gorman #ifndef vma_mmu_pagesize 6553340289dSMel Gorman unsigned long vma_mmu_pagesize(struct vm_area_struct *vma) 6563340289dSMel Gorman { 6573340289dSMel Gorman return vma_kernel_pagesize(vma); 6583340289dSMel Gorman } 6593340289dSMel Gorman #endif 6603340289dSMel Gorman 6613340289dSMel Gorman /* 66284afd99bSAndy Whitcroft * Flags for MAP_PRIVATE reservations. These are stored in the bottom 66384afd99bSAndy Whitcroft * bits of the reservation map pointer, which are always clear due to 66484afd99bSAndy Whitcroft * alignment. 66584afd99bSAndy Whitcroft */ 66684afd99bSAndy Whitcroft #define HPAGE_RESV_OWNER (1UL << 0) 66784afd99bSAndy Whitcroft #define HPAGE_RESV_UNMAPPED (1UL << 1) 66804f2cbe3SMel Gorman #define HPAGE_RESV_MASK (HPAGE_RESV_OWNER | HPAGE_RESV_UNMAPPED) 66984afd99bSAndy Whitcroft 670a1e78772SMel Gorman /* 671a1e78772SMel Gorman * These helpers are used to track how many pages are reserved for 672a1e78772SMel Gorman * faults in a MAP_PRIVATE mapping. Only the process that called mmap() 673a1e78772SMel Gorman * is guaranteed to have their future faults succeed. 674a1e78772SMel Gorman * 675a1e78772SMel Gorman * With the exception of reset_vma_resv_huge_pages() which is called at fork(), 676a1e78772SMel Gorman * the reserve counters are updated with the hugetlb_lock held. It is safe 677a1e78772SMel Gorman * to reset the VMA at fork() time as it is not in use yet and there is no 678a1e78772SMel Gorman * chance of the global counters getting corrupted as a result of the values. 67984afd99bSAndy Whitcroft * 68084afd99bSAndy Whitcroft * The private mapping reservation is represented in a subtly different 68184afd99bSAndy Whitcroft * manner to a shared mapping. A shared mapping has a region map associated 68284afd99bSAndy Whitcroft * with the underlying file, this region map represents the backing file 68384afd99bSAndy Whitcroft * pages which have ever had a reservation assigned which this persists even 68484afd99bSAndy Whitcroft * after the page is instantiated. A private mapping has a region map 68584afd99bSAndy Whitcroft * associated with the original mmap which is attached to all VMAs which 68684afd99bSAndy Whitcroft * reference it, this region map represents those offsets which have consumed 68784afd99bSAndy Whitcroft * reservation ie. where pages have been instantiated. 688a1e78772SMel Gorman */ 689e7c4b0bfSAndy Whitcroft static unsigned long get_vma_private_data(struct vm_area_struct *vma) 690e7c4b0bfSAndy Whitcroft { 691e7c4b0bfSAndy Whitcroft return (unsigned long)vma->vm_private_data; 692e7c4b0bfSAndy Whitcroft } 693e7c4b0bfSAndy Whitcroft 694e7c4b0bfSAndy Whitcroft static void set_vma_private_data(struct vm_area_struct *vma, 695e7c4b0bfSAndy Whitcroft unsigned long value) 696e7c4b0bfSAndy Whitcroft { 697e7c4b0bfSAndy Whitcroft vma->vm_private_data = (void *)value; 698e7c4b0bfSAndy Whitcroft } 699e7c4b0bfSAndy Whitcroft 7009119a41eSJoonsoo Kim struct resv_map *resv_map_alloc(void) 70184afd99bSAndy Whitcroft { 70284afd99bSAndy Whitcroft struct resv_map *resv_map = kmalloc(sizeof(*resv_map), GFP_KERNEL); 7035e911373SMike Kravetz struct file_region *rg = kmalloc(sizeof(*rg), GFP_KERNEL); 7045e911373SMike Kravetz 7055e911373SMike Kravetz if (!resv_map || !rg) { 7065e911373SMike Kravetz kfree(resv_map); 7075e911373SMike Kravetz kfree(rg); 70884afd99bSAndy Whitcroft return NULL; 7095e911373SMike Kravetz } 71084afd99bSAndy Whitcroft 71184afd99bSAndy Whitcroft kref_init(&resv_map->refs); 7127b24d861SDavidlohr Bueso spin_lock_init(&resv_map->lock); 71384afd99bSAndy Whitcroft INIT_LIST_HEAD(&resv_map->regions); 71484afd99bSAndy Whitcroft 7155e911373SMike Kravetz resv_map->adds_in_progress = 0; 7165e911373SMike Kravetz 7175e911373SMike Kravetz INIT_LIST_HEAD(&resv_map->region_cache); 7185e911373SMike Kravetz list_add(&rg->link, &resv_map->region_cache); 7195e911373SMike Kravetz resv_map->region_cache_count = 1; 7205e911373SMike Kravetz 72184afd99bSAndy Whitcroft return resv_map; 72284afd99bSAndy Whitcroft } 72384afd99bSAndy Whitcroft 7249119a41eSJoonsoo Kim void resv_map_release(struct kref *ref) 72584afd99bSAndy Whitcroft { 72684afd99bSAndy Whitcroft struct resv_map *resv_map = container_of(ref, struct resv_map, refs); 7275e911373SMike Kravetz struct list_head *head = &resv_map->region_cache; 7285e911373SMike Kravetz struct file_region *rg, *trg; 72984afd99bSAndy Whitcroft 73084afd99bSAndy Whitcroft /* Clear out any active regions before we release the map. */ 731feba16e2SMike Kravetz region_del(resv_map, 0, LONG_MAX); 7325e911373SMike Kravetz 7335e911373SMike Kravetz /* ... and any entries left in the cache */ 7345e911373SMike Kravetz list_for_each_entry_safe(rg, trg, head, link) { 7355e911373SMike Kravetz list_del(&rg->link); 7365e911373SMike Kravetz kfree(rg); 7375e911373SMike Kravetz } 7385e911373SMike Kravetz 7395e911373SMike Kravetz VM_BUG_ON(resv_map->adds_in_progress); 7405e911373SMike Kravetz 74184afd99bSAndy Whitcroft kfree(resv_map); 74284afd99bSAndy Whitcroft } 74384afd99bSAndy Whitcroft 7444e35f483SJoonsoo Kim static inline struct resv_map *inode_resv_map(struct inode *inode) 7454e35f483SJoonsoo Kim { 7464e35f483SJoonsoo Kim return inode->i_mapping->private_data; 7474e35f483SJoonsoo Kim } 7484e35f483SJoonsoo Kim 74984afd99bSAndy Whitcroft static struct resv_map *vma_resv_map(struct vm_area_struct *vma) 750a1e78772SMel Gorman { 75181d1b09cSSasha Levin VM_BUG_ON_VMA(!is_vm_hugetlb_page(vma), vma); 7524e35f483SJoonsoo Kim if (vma->vm_flags & VM_MAYSHARE) { 7534e35f483SJoonsoo Kim struct address_space *mapping = vma->vm_file->f_mapping; 7544e35f483SJoonsoo Kim struct inode *inode = mapping->host; 7554e35f483SJoonsoo Kim 7564e35f483SJoonsoo Kim return inode_resv_map(inode); 7574e35f483SJoonsoo Kim 7584e35f483SJoonsoo Kim } else { 75984afd99bSAndy Whitcroft return (struct resv_map *)(get_vma_private_data(vma) & 76084afd99bSAndy Whitcroft ~HPAGE_RESV_MASK); 7614e35f483SJoonsoo Kim } 762a1e78772SMel Gorman } 763a1e78772SMel Gorman 76484afd99bSAndy Whitcroft static void set_vma_resv_map(struct vm_area_struct *vma, struct resv_map *map) 765a1e78772SMel Gorman { 76681d1b09cSSasha Levin VM_BUG_ON_VMA(!is_vm_hugetlb_page(vma), vma); 76781d1b09cSSasha Levin VM_BUG_ON_VMA(vma->vm_flags & VM_MAYSHARE, vma); 768a1e78772SMel Gorman 76984afd99bSAndy Whitcroft set_vma_private_data(vma, (get_vma_private_data(vma) & 77084afd99bSAndy Whitcroft HPAGE_RESV_MASK) | (unsigned long)map); 77104f2cbe3SMel Gorman } 77204f2cbe3SMel Gorman 77304f2cbe3SMel Gorman static void set_vma_resv_flags(struct vm_area_struct *vma, unsigned long flags) 77404f2cbe3SMel Gorman { 77581d1b09cSSasha Levin VM_BUG_ON_VMA(!is_vm_hugetlb_page(vma), vma); 77681d1b09cSSasha Levin VM_BUG_ON_VMA(vma->vm_flags & VM_MAYSHARE, vma); 777e7c4b0bfSAndy Whitcroft 778e7c4b0bfSAndy Whitcroft set_vma_private_data(vma, get_vma_private_data(vma) | flags); 77904f2cbe3SMel Gorman } 78004f2cbe3SMel Gorman 78104f2cbe3SMel Gorman static int is_vma_resv_set(struct vm_area_struct *vma, unsigned long flag) 78204f2cbe3SMel Gorman { 78381d1b09cSSasha Levin VM_BUG_ON_VMA(!is_vm_hugetlb_page(vma), vma); 784e7c4b0bfSAndy Whitcroft 785e7c4b0bfSAndy Whitcroft return (get_vma_private_data(vma) & flag) != 0; 786a1e78772SMel Gorman } 787a1e78772SMel Gorman 78804f2cbe3SMel Gorman /* Reset counters to 0 and clear all HPAGE_RESV_* flags */ 789a1e78772SMel Gorman void reset_vma_resv_huge_pages(struct vm_area_struct *vma) 790a1e78772SMel Gorman { 79181d1b09cSSasha Levin VM_BUG_ON_VMA(!is_vm_hugetlb_page(vma), vma); 792f83a275dSMel Gorman if (!(vma->vm_flags & VM_MAYSHARE)) 793a1e78772SMel Gorman vma->vm_private_data = (void *)0; 794a1e78772SMel Gorman } 795a1e78772SMel Gorman 796a1e78772SMel Gorman /* Returns true if the VMA has associated reserve pages */ 797559ec2f8SNicholas Krause static bool vma_has_reserves(struct vm_area_struct *vma, long chg) 798a1e78772SMel Gorman { 799af0ed73eSJoonsoo Kim if (vma->vm_flags & VM_NORESERVE) { 800af0ed73eSJoonsoo Kim /* 801af0ed73eSJoonsoo Kim * This address is already reserved by other process(chg == 0), 802af0ed73eSJoonsoo Kim * so, we should decrement reserved count. Without decrementing, 803af0ed73eSJoonsoo Kim * reserve count remains after releasing inode, because this 804af0ed73eSJoonsoo Kim * allocated page will go into page cache and is regarded as 805af0ed73eSJoonsoo Kim * coming from reserved pool in releasing step. Currently, we 806af0ed73eSJoonsoo Kim * don't have any other solution to deal with this situation 807af0ed73eSJoonsoo Kim * properly, so add work-around here. 808af0ed73eSJoonsoo Kim */ 809af0ed73eSJoonsoo Kim if (vma->vm_flags & VM_MAYSHARE && chg == 0) 810559ec2f8SNicholas Krause return true; 811af0ed73eSJoonsoo Kim else 812559ec2f8SNicholas Krause return false; 813af0ed73eSJoonsoo Kim } 814a63884e9SJoonsoo Kim 815a63884e9SJoonsoo Kim /* Shared mappings always use reserves */ 8161fb1b0e9SMike Kravetz if (vma->vm_flags & VM_MAYSHARE) { 8171fb1b0e9SMike Kravetz /* 8181fb1b0e9SMike Kravetz * We know VM_NORESERVE is not set. Therefore, there SHOULD 8191fb1b0e9SMike Kravetz * be a region map for all pages. The only situation where 8201fb1b0e9SMike Kravetz * there is no region map is if a hole was punched via 8211fb1b0e9SMike Kravetz * fallocate. In this case, there really are no reverves to 8221fb1b0e9SMike Kravetz * use. This situation is indicated if chg != 0. 8231fb1b0e9SMike Kravetz */ 8241fb1b0e9SMike Kravetz if (chg) 8251fb1b0e9SMike Kravetz return false; 8261fb1b0e9SMike Kravetz else 827559ec2f8SNicholas Krause return true; 8281fb1b0e9SMike Kravetz } 829a63884e9SJoonsoo Kim 830a63884e9SJoonsoo Kim /* 831a63884e9SJoonsoo Kim * Only the process that called mmap() has reserves for 832a63884e9SJoonsoo Kim * private mappings. 833a63884e9SJoonsoo Kim */ 8347f09ca51SMel Gorman if (is_vma_resv_set(vma, HPAGE_RESV_OWNER)) 835559ec2f8SNicholas Krause return true; 836a63884e9SJoonsoo Kim 837559ec2f8SNicholas Krause return false; 838a1e78772SMel Gorman } 839a1e78772SMel Gorman 840a5516438SAndi Kleen static void enqueue_huge_page(struct hstate *h, struct page *page) 8411da177e4SLinus Torvalds { 8421da177e4SLinus Torvalds int nid = page_to_nid(page); 8430edaecfaSAneesh Kumar K.V list_move(&page->lru, &h->hugepage_freelists[nid]); 844a5516438SAndi Kleen h->free_huge_pages++; 845a5516438SAndi Kleen h->free_huge_pages_node[nid]++; 8461da177e4SLinus Torvalds } 8471da177e4SLinus Torvalds 848bf50bab2SNaoya Horiguchi static struct page *dequeue_huge_page_node(struct hstate *h, int nid) 849bf50bab2SNaoya Horiguchi { 850bf50bab2SNaoya Horiguchi struct page *page; 851bf50bab2SNaoya Horiguchi 852c8721bbbSNaoya Horiguchi list_for_each_entry(page, &h->hugepage_freelists[nid], lru) 853c8721bbbSNaoya Horiguchi if (!is_migrate_isolate_page(page)) 854c8721bbbSNaoya Horiguchi break; 855c8721bbbSNaoya Horiguchi /* 856c8721bbbSNaoya Horiguchi * if 'non-isolated free hugepage' not found on the list, 857c8721bbbSNaoya Horiguchi * the allocation fails. 858c8721bbbSNaoya Horiguchi */ 859c8721bbbSNaoya Horiguchi if (&h->hugepage_freelists[nid] == &page->lru) 860bf50bab2SNaoya Horiguchi return NULL; 8610edaecfaSAneesh Kumar K.V list_move(&page->lru, &h->hugepage_activelist); 862a9869b83SNaoya Horiguchi set_page_refcounted(page); 863bf50bab2SNaoya Horiguchi h->free_huge_pages--; 864bf50bab2SNaoya Horiguchi h->free_huge_pages_node[nid]--; 865bf50bab2SNaoya Horiguchi return page; 866bf50bab2SNaoya Horiguchi } 867bf50bab2SNaoya Horiguchi 86886cdb465SNaoya Horiguchi /* Movability of hugepages depends on migration support. */ 86986cdb465SNaoya Horiguchi static inline gfp_t htlb_alloc_mask(struct hstate *h) 87086cdb465SNaoya Horiguchi { 871100873d7SNaoya Horiguchi if (hugepages_treat_as_movable || hugepage_migration_supported(h)) 87286cdb465SNaoya Horiguchi return GFP_HIGHUSER_MOVABLE; 87386cdb465SNaoya Horiguchi else 87486cdb465SNaoya Horiguchi return GFP_HIGHUSER; 87586cdb465SNaoya Horiguchi } 87686cdb465SNaoya Horiguchi 877a5516438SAndi Kleen static struct page *dequeue_huge_page_vma(struct hstate *h, 878a5516438SAndi Kleen struct vm_area_struct *vma, 879af0ed73eSJoonsoo Kim unsigned long address, int avoid_reserve, 880af0ed73eSJoonsoo Kim long chg) 8811da177e4SLinus Torvalds { 882b1c12cbcSKonstantin Khlebnikov struct page *page = NULL; 883480eccf9SLee Schermerhorn struct mempolicy *mpol; 88419770b32SMel Gorman nodemask_t *nodemask; 885c0ff7453SMiao Xie struct zonelist *zonelist; 886dd1a239fSMel Gorman struct zone *zone; 887dd1a239fSMel Gorman struct zoneref *z; 888cc9a6c87SMel Gorman unsigned int cpuset_mems_cookie; 8891da177e4SLinus Torvalds 890a1e78772SMel Gorman /* 891a1e78772SMel Gorman * A child process with MAP_PRIVATE mappings created by their parent 892a1e78772SMel Gorman * have no page reserves. This check ensures that reservations are 893a1e78772SMel Gorman * not "stolen". The child may still get SIGKILLed 894a1e78772SMel Gorman */ 895af0ed73eSJoonsoo Kim if (!vma_has_reserves(vma, chg) && 896a5516438SAndi Kleen h->free_huge_pages - h->resv_huge_pages == 0) 897c0ff7453SMiao Xie goto err; 898a1e78772SMel Gorman 89904f2cbe3SMel Gorman /* If reserves cannot be used, ensure enough pages are in the pool */ 900a5516438SAndi Kleen if (avoid_reserve && h->free_huge_pages - h->resv_huge_pages == 0) 9016eab04a8SJustin P. Mattock goto err; 90204f2cbe3SMel Gorman 9039966c4bbSJoonsoo Kim retry_cpuset: 904d26914d1SMel Gorman cpuset_mems_cookie = read_mems_allowed_begin(); 9059966c4bbSJoonsoo Kim zonelist = huge_zonelist(vma, address, 90686cdb465SNaoya Horiguchi htlb_alloc_mask(h), &mpol, &nodemask); 9079966c4bbSJoonsoo Kim 90819770b32SMel Gorman for_each_zone_zonelist_nodemask(zone, z, zonelist, 90919770b32SMel Gorman MAX_NR_ZONES - 1, nodemask) { 910344736f2SVladimir Davydov if (cpuset_zone_allowed(zone, htlb_alloc_mask(h))) { 911bf50bab2SNaoya Horiguchi page = dequeue_huge_page_node(h, zone_to_nid(zone)); 912bf50bab2SNaoya Horiguchi if (page) { 913af0ed73eSJoonsoo Kim if (avoid_reserve) 914af0ed73eSJoonsoo Kim break; 915af0ed73eSJoonsoo Kim if (!vma_has_reserves(vma, chg)) 916af0ed73eSJoonsoo Kim break; 917af0ed73eSJoonsoo Kim 91807443a85SJoonsoo Kim SetPagePrivate(page); 919a63884e9SJoonsoo Kim h->resv_huge_pages--; 9205ab3ee7bSKen Chen break; 9211da177e4SLinus Torvalds } 9223abf7afdSAndrew Morton } 923bf50bab2SNaoya Horiguchi } 924cc9a6c87SMel Gorman 925cc9a6c87SMel Gorman mpol_cond_put(mpol); 926d26914d1SMel Gorman if (unlikely(!page && read_mems_allowed_retry(cpuset_mems_cookie))) 927cc9a6c87SMel Gorman goto retry_cpuset; 928cc9a6c87SMel Gorman return page; 929cc9a6c87SMel Gorman 930c0ff7453SMiao Xie err: 931cc9a6c87SMel Gorman return NULL; 9321da177e4SLinus Torvalds } 9331da177e4SLinus Torvalds 9341cac6f2cSLuiz Capitulino /* 9351cac6f2cSLuiz Capitulino * common helper functions for hstate_next_node_to_{alloc|free}. 9361cac6f2cSLuiz Capitulino * We may have allocated or freed a huge page based on a different 9371cac6f2cSLuiz Capitulino * nodes_allowed previously, so h->next_node_to_{alloc|free} might 9381cac6f2cSLuiz Capitulino * be outside of *nodes_allowed. Ensure that we use an allowed 9391cac6f2cSLuiz Capitulino * node for alloc or free. 9401cac6f2cSLuiz Capitulino */ 9411cac6f2cSLuiz Capitulino static int next_node_allowed(int nid, nodemask_t *nodes_allowed) 9421cac6f2cSLuiz Capitulino { 9430edaf86cSAndrew Morton nid = next_node_in(nid, *nodes_allowed); 9441cac6f2cSLuiz Capitulino VM_BUG_ON(nid >= MAX_NUMNODES); 9451cac6f2cSLuiz Capitulino 9461cac6f2cSLuiz Capitulino return nid; 9471cac6f2cSLuiz Capitulino } 9481cac6f2cSLuiz Capitulino 9491cac6f2cSLuiz Capitulino static int get_valid_node_allowed(int nid, nodemask_t *nodes_allowed) 9501cac6f2cSLuiz Capitulino { 9511cac6f2cSLuiz Capitulino if (!node_isset(nid, *nodes_allowed)) 9521cac6f2cSLuiz Capitulino nid = next_node_allowed(nid, nodes_allowed); 9531cac6f2cSLuiz Capitulino return nid; 9541cac6f2cSLuiz Capitulino } 9551cac6f2cSLuiz Capitulino 9561cac6f2cSLuiz Capitulino /* 9571cac6f2cSLuiz Capitulino * returns the previously saved node ["this node"] from which to 9581cac6f2cSLuiz Capitulino * allocate a persistent huge page for the pool and advance the 9591cac6f2cSLuiz Capitulino * next node from which to allocate, handling wrap at end of node 9601cac6f2cSLuiz Capitulino * mask. 9611cac6f2cSLuiz Capitulino */ 9621cac6f2cSLuiz Capitulino static int hstate_next_node_to_alloc(struct hstate *h, 9631cac6f2cSLuiz Capitulino nodemask_t *nodes_allowed) 9641cac6f2cSLuiz Capitulino { 9651cac6f2cSLuiz Capitulino int nid; 9661cac6f2cSLuiz Capitulino 9671cac6f2cSLuiz Capitulino VM_BUG_ON(!nodes_allowed); 9681cac6f2cSLuiz Capitulino 9691cac6f2cSLuiz Capitulino nid = get_valid_node_allowed(h->next_nid_to_alloc, nodes_allowed); 9701cac6f2cSLuiz Capitulino h->next_nid_to_alloc = next_node_allowed(nid, nodes_allowed); 9711cac6f2cSLuiz Capitulino 9721cac6f2cSLuiz Capitulino return nid; 9731cac6f2cSLuiz Capitulino } 9741cac6f2cSLuiz Capitulino 9751cac6f2cSLuiz Capitulino /* 9761cac6f2cSLuiz Capitulino * helper for free_pool_huge_page() - return the previously saved 9771cac6f2cSLuiz Capitulino * node ["this node"] from which to free a huge page. Advance the 9781cac6f2cSLuiz Capitulino * next node id whether or not we find a free huge page to free so 9791cac6f2cSLuiz Capitulino * that the next attempt to free addresses the next node. 9801cac6f2cSLuiz Capitulino */ 9811cac6f2cSLuiz Capitulino static int hstate_next_node_to_free(struct hstate *h, nodemask_t *nodes_allowed) 9821cac6f2cSLuiz Capitulino { 9831cac6f2cSLuiz Capitulino int nid; 9841cac6f2cSLuiz Capitulino 9851cac6f2cSLuiz Capitulino VM_BUG_ON(!nodes_allowed); 9861cac6f2cSLuiz Capitulino 9871cac6f2cSLuiz Capitulino nid = get_valid_node_allowed(h->next_nid_to_free, nodes_allowed); 9881cac6f2cSLuiz Capitulino h->next_nid_to_free = next_node_allowed(nid, nodes_allowed); 9891cac6f2cSLuiz Capitulino 9901cac6f2cSLuiz Capitulino return nid; 9911cac6f2cSLuiz Capitulino } 9921cac6f2cSLuiz Capitulino 9931cac6f2cSLuiz Capitulino #define for_each_node_mask_to_alloc(hs, nr_nodes, node, mask) \ 9941cac6f2cSLuiz Capitulino for (nr_nodes = nodes_weight(*mask); \ 9951cac6f2cSLuiz Capitulino nr_nodes > 0 && \ 9961cac6f2cSLuiz Capitulino ((node = hstate_next_node_to_alloc(hs, mask)) || 1); \ 9971cac6f2cSLuiz Capitulino nr_nodes--) 9981cac6f2cSLuiz Capitulino 9991cac6f2cSLuiz Capitulino #define for_each_node_mask_to_free(hs, nr_nodes, node, mask) \ 10001cac6f2cSLuiz Capitulino for (nr_nodes = nodes_weight(*mask); \ 10011cac6f2cSLuiz Capitulino nr_nodes > 0 && \ 10021cac6f2cSLuiz Capitulino ((node = hstate_next_node_to_free(hs, mask)) || 1); \ 10031cac6f2cSLuiz Capitulino nr_nodes--) 10041cac6f2cSLuiz Capitulino 1005080fe206SVlastimil Babka #if defined(CONFIG_X86_64) && ((defined(CONFIG_MEMORY_ISOLATION) && defined(CONFIG_COMPACTION)) || defined(CONFIG_CMA)) 1006944d9fecSLuiz Capitulino static void destroy_compound_gigantic_page(struct page *page, 1007d00181b9SKirill A. Shutemov unsigned int order) 1008944d9fecSLuiz Capitulino { 1009944d9fecSLuiz Capitulino int i; 1010944d9fecSLuiz Capitulino int nr_pages = 1 << order; 1011944d9fecSLuiz Capitulino struct page *p = page + 1; 1012944d9fecSLuiz Capitulino 1013944d9fecSLuiz Capitulino for (i = 1; i < nr_pages; i++, p = mem_map_next(p, page, i)) { 10141d798ca3SKirill A. Shutemov clear_compound_head(p); 1015944d9fecSLuiz Capitulino set_page_refcounted(p); 1016944d9fecSLuiz Capitulino } 1017944d9fecSLuiz Capitulino 1018944d9fecSLuiz Capitulino set_compound_order(page, 0); 1019944d9fecSLuiz Capitulino __ClearPageHead(page); 1020944d9fecSLuiz Capitulino } 1021944d9fecSLuiz Capitulino 1022d00181b9SKirill A. Shutemov static void free_gigantic_page(struct page *page, unsigned int order) 1023944d9fecSLuiz Capitulino { 1024944d9fecSLuiz Capitulino free_contig_range(page_to_pfn(page), 1 << order); 1025944d9fecSLuiz Capitulino } 1026944d9fecSLuiz Capitulino 1027944d9fecSLuiz Capitulino static int __alloc_gigantic_page(unsigned long start_pfn, 1028944d9fecSLuiz Capitulino unsigned long nr_pages) 1029944d9fecSLuiz Capitulino { 1030944d9fecSLuiz Capitulino unsigned long end_pfn = start_pfn + nr_pages; 1031944d9fecSLuiz Capitulino return alloc_contig_range(start_pfn, end_pfn, MIGRATE_MOVABLE); 1032944d9fecSLuiz Capitulino } 1033944d9fecSLuiz Capitulino 1034944d9fecSLuiz Capitulino static bool pfn_range_valid_gigantic(unsigned long start_pfn, 1035944d9fecSLuiz Capitulino unsigned long nr_pages) 1036944d9fecSLuiz Capitulino { 1037944d9fecSLuiz Capitulino unsigned long i, end_pfn = start_pfn + nr_pages; 1038944d9fecSLuiz Capitulino struct page *page; 1039944d9fecSLuiz Capitulino 1040944d9fecSLuiz Capitulino for (i = start_pfn; i < end_pfn; i++) { 1041944d9fecSLuiz Capitulino if (!pfn_valid(i)) 1042944d9fecSLuiz Capitulino return false; 1043944d9fecSLuiz Capitulino 1044944d9fecSLuiz Capitulino page = pfn_to_page(i); 1045944d9fecSLuiz Capitulino 1046944d9fecSLuiz Capitulino if (PageReserved(page)) 1047944d9fecSLuiz Capitulino return false; 1048944d9fecSLuiz Capitulino 1049944d9fecSLuiz Capitulino if (page_count(page) > 0) 1050944d9fecSLuiz Capitulino return false; 1051944d9fecSLuiz Capitulino 1052944d9fecSLuiz Capitulino if (PageHuge(page)) 1053944d9fecSLuiz Capitulino return false; 1054944d9fecSLuiz Capitulino } 1055944d9fecSLuiz Capitulino 1056944d9fecSLuiz Capitulino return true; 1057944d9fecSLuiz Capitulino } 1058944d9fecSLuiz Capitulino 1059944d9fecSLuiz Capitulino static bool zone_spans_last_pfn(const struct zone *zone, 1060944d9fecSLuiz Capitulino unsigned long start_pfn, unsigned long nr_pages) 1061944d9fecSLuiz Capitulino { 1062944d9fecSLuiz Capitulino unsigned long last_pfn = start_pfn + nr_pages - 1; 1063944d9fecSLuiz Capitulino return zone_spans_pfn(zone, last_pfn); 1064944d9fecSLuiz Capitulino } 1065944d9fecSLuiz Capitulino 1066d00181b9SKirill A. Shutemov static struct page *alloc_gigantic_page(int nid, unsigned int order) 1067944d9fecSLuiz Capitulino { 1068944d9fecSLuiz Capitulino unsigned long nr_pages = 1 << order; 1069944d9fecSLuiz Capitulino unsigned long ret, pfn, flags; 1070944d9fecSLuiz Capitulino struct zone *z; 1071944d9fecSLuiz Capitulino 1072944d9fecSLuiz Capitulino z = NODE_DATA(nid)->node_zones; 1073944d9fecSLuiz Capitulino for (; z - NODE_DATA(nid)->node_zones < MAX_NR_ZONES; z++) { 1074944d9fecSLuiz Capitulino spin_lock_irqsave(&z->lock, flags); 1075944d9fecSLuiz Capitulino 1076944d9fecSLuiz Capitulino pfn = ALIGN(z->zone_start_pfn, nr_pages); 1077944d9fecSLuiz Capitulino while (zone_spans_last_pfn(z, pfn, nr_pages)) { 1078944d9fecSLuiz Capitulino if (pfn_range_valid_gigantic(pfn, nr_pages)) { 1079944d9fecSLuiz Capitulino /* 1080944d9fecSLuiz Capitulino * We release the zone lock here because 1081944d9fecSLuiz Capitulino * alloc_contig_range() will also lock the zone 1082944d9fecSLuiz Capitulino * at some point. If there's an allocation 1083944d9fecSLuiz Capitulino * spinning on this lock, it may win the race 1084944d9fecSLuiz Capitulino * and cause alloc_contig_range() to fail... 1085944d9fecSLuiz Capitulino */ 1086944d9fecSLuiz Capitulino spin_unlock_irqrestore(&z->lock, flags); 1087944d9fecSLuiz Capitulino ret = __alloc_gigantic_page(pfn, nr_pages); 1088944d9fecSLuiz Capitulino if (!ret) 1089944d9fecSLuiz Capitulino return pfn_to_page(pfn); 1090944d9fecSLuiz Capitulino spin_lock_irqsave(&z->lock, flags); 1091944d9fecSLuiz Capitulino } 1092944d9fecSLuiz Capitulino pfn += nr_pages; 1093944d9fecSLuiz Capitulino } 1094944d9fecSLuiz Capitulino 1095944d9fecSLuiz Capitulino spin_unlock_irqrestore(&z->lock, flags); 1096944d9fecSLuiz Capitulino } 1097944d9fecSLuiz Capitulino 1098944d9fecSLuiz Capitulino return NULL; 1099944d9fecSLuiz Capitulino } 1100944d9fecSLuiz Capitulino 1101944d9fecSLuiz Capitulino static void prep_new_huge_page(struct hstate *h, struct page *page, int nid); 1102d00181b9SKirill A. Shutemov static void prep_compound_gigantic_page(struct page *page, unsigned int order); 1103944d9fecSLuiz Capitulino 1104944d9fecSLuiz Capitulino static struct page *alloc_fresh_gigantic_page_node(struct hstate *h, int nid) 1105944d9fecSLuiz Capitulino { 1106944d9fecSLuiz Capitulino struct page *page; 1107944d9fecSLuiz Capitulino 1108944d9fecSLuiz Capitulino page = alloc_gigantic_page(nid, huge_page_order(h)); 1109944d9fecSLuiz Capitulino if (page) { 1110944d9fecSLuiz Capitulino prep_compound_gigantic_page(page, huge_page_order(h)); 1111944d9fecSLuiz Capitulino prep_new_huge_page(h, page, nid); 1112944d9fecSLuiz Capitulino } 1113944d9fecSLuiz Capitulino 1114944d9fecSLuiz Capitulino return page; 1115944d9fecSLuiz Capitulino } 1116944d9fecSLuiz Capitulino 1117944d9fecSLuiz Capitulino static int alloc_fresh_gigantic_page(struct hstate *h, 1118944d9fecSLuiz Capitulino nodemask_t *nodes_allowed) 1119944d9fecSLuiz Capitulino { 1120944d9fecSLuiz Capitulino struct page *page = NULL; 1121944d9fecSLuiz Capitulino int nr_nodes, node; 1122944d9fecSLuiz Capitulino 1123944d9fecSLuiz Capitulino for_each_node_mask_to_alloc(h, nr_nodes, node, nodes_allowed) { 1124944d9fecSLuiz Capitulino page = alloc_fresh_gigantic_page_node(h, node); 1125944d9fecSLuiz Capitulino if (page) 1126944d9fecSLuiz Capitulino return 1; 1127944d9fecSLuiz Capitulino } 1128944d9fecSLuiz Capitulino 1129944d9fecSLuiz Capitulino return 0; 1130944d9fecSLuiz Capitulino } 1131944d9fecSLuiz Capitulino 1132944d9fecSLuiz Capitulino static inline bool gigantic_page_supported(void) { return true; } 1133944d9fecSLuiz Capitulino #else 1134944d9fecSLuiz Capitulino static inline bool gigantic_page_supported(void) { return false; } 1135d00181b9SKirill A. Shutemov static inline void free_gigantic_page(struct page *page, unsigned int order) { } 1136944d9fecSLuiz Capitulino static inline void destroy_compound_gigantic_page(struct page *page, 1137d00181b9SKirill A. Shutemov unsigned int order) { } 1138944d9fecSLuiz Capitulino static inline int alloc_fresh_gigantic_page(struct hstate *h, 1139944d9fecSLuiz Capitulino nodemask_t *nodes_allowed) { return 0; } 1140944d9fecSLuiz Capitulino #endif 1141944d9fecSLuiz Capitulino 1142a5516438SAndi Kleen static void update_and_free_page(struct hstate *h, struct page *page) 11436af2acb6SAdam Litke { 11446af2acb6SAdam Litke int i; 1145a5516438SAndi Kleen 1146944d9fecSLuiz Capitulino if (hstate_is_gigantic(h) && !gigantic_page_supported()) 1147944d9fecSLuiz Capitulino return; 114818229df5SAndy Whitcroft 1149a5516438SAndi Kleen h->nr_huge_pages--; 1150a5516438SAndi Kleen h->nr_huge_pages_node[page_to_nid(page)]--; 1151a5516438SAndi Kleen for (i = 0; i < pages_per_huge_page(h); i++) { 115232f84528SChris Forbes page[i].flags &= ~(1 << PG_locked | 1 << PG_error | 115332f84528SChris Forbes 1 << PG_referenced | 1 << PG_dirty | 1154a7407a27SLuiz Capitulino 1 << PG_active | 1 << PG_private | 1155a7407a27SLuiz Capitulino 1 << PG_writeback); 11566af2acb6SAdam Litke } 1157309381feSSasha Levin VM_BUG_ON_PAGE(hugetlb_cgroup_from_page(page), page); 1158f1e61557SKirill A. Shutemov set_compound_page_dtor(page, NULL_COMPOUND_DTOR); 11596af2acb6SAdam Litke set_page_refcounted(page); 1160944d9fecSLuiz Capitulino if (hstate_is_gigantic(h)) { 1161944d9fecSLuiz Capitulino destroy_compound_gigantic_page(page, huge_page_order(h)); 1162944d9fecSLuiz Capitulino free_gigantic_page(page, huge_page_order(h)); 1163944d9fecSLuiz Capitulino } else { 1164a5516438SAndi Kleen __free_pages(page, huge_page_order(h)); 11656af2acb6SAdam Litke } 1166944d9fecSLuiz Capitulino } 11676af2acb6SAdam Litke 1168e5ff2159SAndi Kleen struct hstate *size_to_hstate(unsigned long size) 1169e5ff2159SAndi Kleen { 1170e5ff2159SAndi Kleen struct hstate *h; 1171e5ff2159SAndi Kleen 1172e5ff2159SAndi Kleen for_each_hstate(h) { 1173e5ff2159SAndi Kleen if (huge_page_size(h) == size) 1174e5ff2159SAndi Kleen return h; 1175e5ff2159SAndi Kleen } 1176e5ff2159SAndi Kleen return NULL; 1177e5ff2159SAndi Kleen } 1178e5ff2159SAndi Kleen 1179bcc54222SNaoya Horiguchi /* 1180bcc54222SNaoya Horiguchi * Test to determine whether the hugepage is "active/in-use" (i.e. being linked 1181bcc54222SNaoya Horiguchi * to hstate->hugepage_activelist.) 1182bcc54222SNaoya Horiguchi * 1183bcc54222SNaoya Horiguchi * This function can be called for tail pages, but never returns true for them. 1184bcc54222SNaoya Horiguchi */ 1185bcc54222SNaoya Horiguchi bool page_huge_active(struct page *page) 1186bcc54222SNaoya Horiguchi { 1187bcc54222SNaoya Horiguchi VM_BUG_ON_PAGE(!PageHuge(page), page); 1188bcc54222SNaoya Horiguchi return PageHead(page) && PagePrivate(&page[1]); 1189bcc54222SNaoya Horiguchi } 1190bcc54222SNaoya Horiguchi 1191bcc54222SNaoya Horiguchi /* never called for tail page */ 1192bcc54222SNaoya Horiguchi static void set_page_huge_active(struct page *page) 1193bcc54222SNaoya Horiguchi { 1194bcc54222SNaoya Horiguchi VM_BUG_ON_PAGE(!PageHeadHuge(page), page); 1195bcc54222SNaoya Horiguchi SetPagePrivate(&page[1]); 1196bcc54222SNaoya Horiguchi } 1197bcc54222SNaoya Horiguchi 1198bcc54222SNaoya Horiguchi static void clear_page_huge_active(struct page *page) 1199bcc54222SNaoya Horiguchi { 1200bcc54222SNaoya Horiguchi VM_BUG_ON_PAGE(!PageHeadHuge(page), page); 1201bcc54222SNaoya Horiguchi ClearPagePrivate(&page[1]); 1202bcc54222SNaoya Horiguchi } 1203bcc54222SNaoya Horiguchi 12048f1d26d0SAtsushi Kumagai void free_huge_page(struct page *page) 120527a85ef1SDavid Gibson { 1206a5516438SAndi Kleen /* 1207a5516438SAndi Kleen * Can't pass hstate in here because it is called from the 1208a5516438SAndi Kleen * compound page destructor. 1209a5516438SAndi Kleen */ 1210e5ff2159SAndi Kleen struct hstate *h = page_hstate(page); 12117893d1d5SAdam Litke int nid = page_to_nid(page); 121290481622SDavid Gibson struct hugepage_subpool *spool = 121390481622SDavid Gibson (struct hugepage_subpool *)page_private(page); 121407443a85SJoonsoo Kim bool restore_reserve; 121527a85ef1SDavid Gibson 1216e5df70abSAndy Whitcroft set_page_private(page, 0); 121723be7468SMel Gorman page->mapping = NULL; 1218b4330afbSMike Kravetz VM_BUG_ON_PAGE(page_count(page), page); 1219b4330afbSMike Kravetz VM_BUG_ON_PAGE(page_mapcount(page), page); 122007443a85SJoonsoo Kim restore_reserve = PagePrivate(page); 122116c794b4SJoonsoo Kim ClearPagePrivate(page); 122227a85ef1SDavid Gibson 12231c5ecae3SMike Kravetz /* 12241c5ecae3SMike Kravetz * A return code of zero implies that the subpool will be under its 12251c5ecae3SMike Kravetz * minimum size if the reservation is not restored after page is free. 12261c5ecae3SMike Kravetz * Therefore, force restore_reserve operation. 12271c5ecae3SMike Kravetz */ 12281c5ecae3SMike Kravetz if (hugepage_subpool_put_pages(spool, 1) == 0) 12291c5ecae3SMike Kravetz restore_reserve = true; 12301c5ecae3SMike Kravetz 123127a85ef1SDavid Gibson spin_lock(&hugetlb_lock); 1232bcc54222SNaoya Horiguchi clear_page_huge_active(page); 12336d76dcf4SAneesh Kumar K.V hugetlb_cgroup_uncharge_page(hstate_index(h), 12346d76dcf4SAneesh Kumar K.V pages_per_huge_page(h), page); 123507443a85SJoonsoo Kim if (restore_reserve) 123607443a85SJoonsoo Kim h->resv_huge_pages++; 123707443a85SJoonsoo Kim 1238944d9fecSLuiz Capitulino if (h->surplus_huge_pages_node[nid]) { 12390edaecfaSAneesh Kumar K.V /* remove the page from active list */ 12400edaecfaSAneesh Kumar K.V list_del(&page->lru); 1241a5516438SAndi Kleen update_and_free_page(h, page); 1242a5516438SAndi Kleen h->surplus_huge_pages--; 1243a5516438SAndi Kleen h->surplus_huge_pages_node[nid]--; 12447893d1d5SAdam Litke } else { 12455d3a551cSWill Deacon arch_clear_hugepage_flags(page); 1246a5516438SAndi Kleen enqueue_huge_page(h, page); 12477893d1d5SAdam Litke } 124827a85ef1SDavid Gibson spin_unlock(&hugetlb_lock); 124927a85ef1SDavid Gibson } 125027a85ef1SDavid Gibson 1251a5516438SAndi Kleen static void prep_new_huge_page(struct hstate *h, struct page *page, int nid) 1252b7ba30c6SAndi Kleen { 12530edaecfaSAneesh Kumar K.V INIT_LIST_HEAD(&page->lru); 1254f1e61557SKirill A. Shutemov set_compound_page_dtor(page, HUGETLB_PAGE_DTOR); 1255b7ba30c6SAndi Kleen spin_lock(&hugetlb_lock); 12569dd540e2SAneesh Kumar K.V set_hugetlb_cgroup(page, NULL); 1257a5516438SAndi Kleen h->nr_huge_pages++; 1258a5516438SAndi Kleen h->nr_huge_pages_node[nid]++; 1259b7ba30c6SAndi Kleen spin_unlock(&hugetlb_lock); 1260b7ba30c6SAndi Kleen put_page(page); /* free it into the hugepage allocator */ 1261b7ba30c6SAndi Kleen } 1262b7ba30c6SAndi Kleen 1263d00181b9SKirill A. Shutemov static void prep_compound_gigantic_page(struct page *page, unsigned int order) 126420a0307cSWu Fengguang { 126520a0307cSWu Fengguang int i; 126620a0307cSWu Fengguang int nr_pages = 1 << order; 126720a0307cSWu Fengguang struct page *p = page + 1; 126820a0307cSWu Fengguang 126920a0307cSWu Fengguang /* we rely on prep_new_huge_page to set the destructor */ 127020a0307cSWu Fengguang set_compound_order(page, order); 1271ef5a22beSAndrea Arcangeli __ClearPageReserved(page); 1272de09d31dSKirill A. Shutemov __SetPageHead(page); 127320a0307cSWu Fengguang for (i = 1; i < nr_pages; i++, p = mem_map_next(p, page, i)) { 1274ef5a22beSAndrea Arcangeli /* 1275ef5a22beSAndrea Arcangeli * For gigantic hugepages allocated through bootmem at 1276ef5a22beSAndrea Arcangeli * boot, it's safer to be consistent with the not-gigantic 1277ef5a22beSAndrea Arcangeli * hugepages and clear the PG_reserved bit from all tail pages 1278ef5a22beSAndrea Arcangeli * too. Otherwse drivers using get_user_pages() to access tail 1279ef5a22beSAndrea Arcangeli * pages may get the reference counting wrong if they see 1280ef5a22beSAndrea Arcangeli * PG_reserved set on a tail page (despite the head page not 1281ef5a22beSAndrea Arcangeli * having PG_reserved set). Enforcing this consistency between 1282ef5a22beSAndrea Arcangeli * head and tail pages allows drivers to optimize away a check 1283ef5a22beSAndrea Arcangeli * on the head page when they need know if put_page() is needed 1284ef5a22beSAndrea Arcangeli * after get_user_pages(). 1285ef5a22beSAndrea Arcangeli */ 1286ef5a22beSAndrea Arcangeli __ClearPageReserved(p); 128758a84aa9SYouquan Song set_page_count(p, 0); 12881d798ca3SKirill A. Shutemov set_compound_head(p, page); 128920a0307cSWu Fengguang } 1290b4330afbSMike Kravetz atomic_set(compound_mapcount_ptr(page), -1); 129120a0307cSWu Fengguang } 129220a0307cSWu Fengguang 12937795912cSAndrew Morton /* 12947795912cSAndrew Morton * PageHuge() only returns true for hugetlbfs pages, but not for normal or 12957795912cSAndrew Morton * transparent huge pages. See the PageTransHuge() documentation for more 12967795912cSAndrew Morton * details. 12977795912cSAndrew Morton */ 129820a0307cSWu Fengguang int PageHuge(struct page *page) 129920a0307cSWu Fengguang { 130020a0307cSWu Fengguang if (!PageCompound(page)) 130120a0307cSWu Fengguang return 0; 130220a0307cSWu Fengguang 130320a0307cSWu Fengguang page = compound_head(page); 1304f1e61557SKirill A. Shutemov return page[1].compound_dtor == HUGETLB_PAGE_DTOR; 130520a0307cSWu Fengguang } 130643131e14SNaoya Horiguchi EXPORT_SYMBOL_GPL(PageHuge); 130743131e14SNaoya Horiguchi 130827c73ae7SAndrea Arcangeli /* 130927c73ae7SAndrea Arcangeli * PageHeadHuge() only returns true for hugetlbfs head page, but not for 131027c73ae7SAndrea Arcangeli * normal or transparent huge pages. 131127c73ae7SAndrea Arcangeli */ 131227c73ae7SAndrea Arcangeli int PageHeadHuge(struct page *page_head) 131327c73ae7SAndrea Arcangeli { 131427c73ae7SAndrea Arcangeli if (!PageHead(page_head)) 131527c73ae7SAndrea Arcangeli return 0; 131627c73ae7SAndrea Arcangeli 1317758f66a2SAndrew Morton return get_compound_page_dtor(page_head) == free_huge_page; 131827c73ae7SAndrea Arcangeli } 131927c73ae7SAndrea Arcangeli 132013d60f4bSZhang Yi pgoff_t __basepage_index(struct page *page) 132113d60f4bSZhang Yi { 132213d60f4bSZhang Yi struct page *page_head = compound_head(page); 132313d60f4bSZhang Yi pgoff_t index = page_index(page_head); 132413d60f4bSZhang Yi unsigned long compound_idx; 132513d60f4bSZhang Yi 132613d60f4bSZhang Yi if (!PageHuge(page_head)) 132713d60f4bSZhang Yi return page_index(page); 132813d60f4bSZhang Yi 132913d60f4bSZhang Yi if (compound_order(page_head) >= MAX_ORDER) 133013d60f4bSZhang Yi compound_idx = page_to_pfn(page) - page_to_pfn(page_head); 133113d60f4bSZhang Yi else 133213d60f4bSZhang Yi compound_idx = page - page_head; 133313d60f4bSZhang Yi 133413d60f4bSZhang Yi return (index << compound_order(page_head)) + compound_idx; 133513d60f4bSZhang Yi } 133613d60f4bSZhang Yi 1337a5516438SAndi Kleen static struct page *alloc_fresh_huge_page_node(struct hstate *h, int nid) 13381da177e4SLinus Torvalds { 13391da177e4SLinus Torvalds struct page *page; 1340f96efd58SJoe Jin 134196db800fSVlastimil Babka page = __alloc_pages_node(nid, 134286cdb465SNaoya Horiguchi htlb_alloc_mask(h)|__GFP_COMP|__GFP_THISNODE| 1343551883aeSNishanth Aravamudan __GFP_REPEAT|__GFP_NOWARN, 1344a5516438SAndi Kleen huge_page_order(h)); 13451da177e4SLinus Torvalds if (page) { 1346a5516438SAndi Kleen prep_new_huge_page(h, page, nid); 13471da177e4SLinus Torvalds } 134863b4613cSNishanth Aravamudan 134963b4613cSNishanth Aravamudan return page; 135063b4613cSNishanth Aravamudan } 135163b4613cSNishanth Aravamudan 1352b2261026SJoonsoo Kim static int alloc_fresh_huge_page(struct hstate *h, nodemask_t *nodes_allowed) 1353b2261026SJoonsoo Kim { 1354b2261026SJoonsoo Kim struct page *page; 1355b2261026SJoonsoo Kim int nr_nodes, node; 1356b2261026SJoonsoo Kim int ret = 0; 1357b2261026SJoonsoo Kim 1358b2261026SJoonsoo Kim for_each_node_mask_to_alloc(h, nr_nodes, node, nodes_allowed) { 1359b2261026SJoonsoo Kim page = alloc_fresh_huge_page_node(h, node); 1360b2261026SJoonsoo Kim if (page) { 1361b2261026SJoonsoo Kim ret = 1; 1362b2261026SJoonsoo Kim break; 1363b2261026SJoonsoo Kim } 1364b2261026SJoonsoo Kim } 1365b2261026SJoonsoo Kim 1366b2261026SJoonsoo Kim if (ret) 1367b2261026SJoonsoo Kim count_vm_event(HTLB_BUDDY_PGALLOC); 1368b2261026SJoonsoo Kim else 1369b2261026SJoonsoo Kim count_vm_event(HTLB_BUDDY_PGALLOC_FAIL); 1370b2261026SJoonsoo Kim 1371b2261026SJoonsoo Kim return ret; 1372b2261026SJoonsoo Kim } 1373b2261026SJoonsoo Kim 1374e8c5c824SLee Schermerhorn /* 1375e8c5c824SLee Schermerhorn * Free huge page from pool from next node to free. 1376e8c5c824SLee Schermerhorn * Attempt to keep persistent huge pages more or less 1377e8c5c824SLee Schermerhorn * balanced over allowed nodes. 1378e8c5c824SLee Schermerhorn * Called with hugetlb_lock locked. 1379e8c5c824SLee Schermerhorn */ 13806ae11b27SLee Schermerhorn static int free_pool_huge_page(struct hstate *h, nodemask_t *nodes_allowed, 13816ae11b27SLee Schermerhorn bool acct_surplus) 1382e8c5c824SLee Schermerhorn { 1383b2261026SJoonsoo Kim int nr_nodes, node; 1384e8c5c824SLee Schermerhorn int ret = 0; 1385e8c5c824SLee Schermerhorn 1386b2261026SJoonsoo Kim for_each_node_mask_to_free(h, nr_nodes, node, nodes_allowed) { 1387685f3457SLee Schermerhorn /* 1388685f3457SLee Schermerhorn * If we're returning unused surplus pages, only examine 1389685f3457SLee Schermerhorn * nodes with surplus pages. 1390685f3457SLee Schermerhorn */ 1391b2261026SJoonsoo Kim if ((!acct_surplus || h->surplus_huge_pages_node[node]) && 1392b2261026SJoonsoo Kim !list_empty(&h->hugepage_freelists[node])) { 1393e8c5c824SLee Schermerhorn struct page *page = 1394b2261026SJoonsoo Kim list_entry(h->hugepage_freelists[node].next, 1395e8c5c824SLee Schermerhorn struct page, lru); 1396e8c5c824SLee Schermerhorn list_del(&page->lru); 1397e8c5c824SLee Schermerhorn h->free_huge_pages--; 1398b2261026SJoonsoo Kim h->free_huge_pages_node[node]--; 1399685f3457SLee Schermerhorn if (acct_surplus) { 1400685f3457SLee Schermerhorn h->surplus_huge_pages--; 1401b2261026SJoonsoo Kim h->surplus_huge_pages_node[node]--; 1402685f3457SLee Schermerhorn } 1403e8c5c824SLee Schermerhorn update_and_free_page(h, page); 1404e8c5c824SLee Schermerhorn ret = 1; 14059a76db09SLee Schermerhorn break; 1406e8c5c824SLee Schermerhorn } 1407b2261026SJoonsoo Kim } 1408e8c5c824SLee Schermerhorn 1409e8c5c824SLee Schermerhorn return ret; 1410e8c5c824SLee Schermerhorn } 1411e8c5c824SLee Schermerhorn 1412c8721bbbSNaoya Horiguchi /* 1413c8721bbbSNaoya Horiguchi * Dissolve a given free hugepage into free buddy pages. This function does 1414c8721bbbSNaoya Horiguchi * nothing for in-use (including surplus) hugepages. 1415c8721bbbSNaoya Horiguchi */ 1416c8721bbbSNaoya Horiguchi static void dissolve_free_huge_page(struct page *page) 1417c8721bbbSNaoya Horiguchi { 1418c8721bbbSNaoya Horiguchi spin_lock(&hugetlb_lock); 1419c8721bbbSNaoya Horiguchi if (PageHuge(page) && !page_count(page)) { 1420c8721bbbSNaoya Horiguchi struct hstate *h = page_hstate(page); 1421c8721bbbSNaoya Horiguchi int nid = page_to_nid(page); 1422c8721bbbSNaoya Horiguchi list_del(&page->lru); 1423c8721bbbSNaoya Horiguchi h->free_huge_pages--; 1424c8721bbbSNaoya Horiguchi h->free_huge_pages_node[nid]--; 1425c8721bbbSNaoya Horiguchi update_and_free_page(h, page); 1426c8721bbbSNaoya Horiguchi } 1427c8721bbbSNaoya Horiguchi spin_unlock(&hugetlb_lock); 1428c8721bbbSNaoya Horiguchi } 1429c8721bbbSNaoya Horiguchi 1430c8721bbbSNaoya Horiguchi /* 1431c8721bbbSNaoya Horiguchi * Dissolve free hugepages in a given pfn range. Used by memory hotplug to 1432c8721bbbSNaoya Horiguchi * make specified memory blocks removable from the system. 1433c8721bbbSNaoya Horiguchi * Note that start_pfn should aligned with (minimum) hugepage size. 1434c8721bbbSNaoya Horiguchi */ 1435c8721bbbSNaoya Horiguchi void dissolve_free_huge_pages(unsigned long start_pfn, unsigned long end_pfn) 1436c8721bbbSNaoya Horiguchi { 1437c8721bbbSNaoya Horiguchi unsigned long pfn; 1438c8721bbbSNaoya Horiguchi 1439d0177639SLi Zhong if (!hugepages_supported()) 1440d0177639SLi Zhong return; 1441d0177639SLi Zhong 1442641844f5SNaoya Horiguchi VM_BUG_ON(!IS_ALIGNED(start_pfn, 1 << minimum_order)); 1443641844f5SNaoya Horiguchi for (pfn = start_pfn; pfn < end_pfn; pfn += 1 << minimum_order) 1444c8721bbbSNaoya Horiguchi dissolve_free_huge_page(pfn_to_page(pfn)); 1445c8721bbbSNaoya Horiguchi } 1446c8721bbbSNaoya Horiguchi 1447099730d6SDave Hansen /* 1448099730d6SDave Hansen * There are 3 ways this can get called: 1449099730d6SDave Hansen * 1. With vma+addr: we use the VMA's memory policy 1450099730d6SDave Hansen * 2. With !vma, but nid=NUMA_NO_NODE: We try to allocate a huge 1451099730d6SDave Hansen * page from any node, and let the buddy allocator itself figure 1452099730d6SDave Hansen * it out. 1453099730d6SDave Hansen * 3. With !vma, but nid!=NUMA_NO_NODE. We allocate a huge page 1454099730d6SDave Hansen * strictly from 'nid' 1455099730d6SDave Hansen */ 1456099730d6SDave Hansen static struct page *__hugetlb_alloc_buddy_huge_page(struct hstate *h, 1457099730d6SDave Hansen struct vm_area_struct *vma, unsigned long addr, int nid) 1458099730d6SDave Hansen { 1459099730d6SDave Hansen int order = huge_page_order(h); 1460099730d6SDave Hansen gfp_t gfp = htlb_alloc_mask(h)|__GFP_COMP|__GFP_REPEAT|__GFP_NOWARN; 1461099730d6SDave Hansen unsigned int cpuset_mems_cookie; 1462099730d6SDave Hansen 1463099730d6SDave Hansen /* 1464099730d6SDave Hansen * We need a VMA to get a memory policy. If we do not 1465e0ec90eeSDave Hansen * have one, we use the 'nid' argument. 1466e0ec90eeSDave Hansen * 1467e0ec90eeSDave Hansen * The mempolicy stuff below has some non-inlined bits 1468e0ec90eeSDave Hansen * and calls ->vm_ops. That makes it hard to optimize at 1469e0ec90eeSDave Hansen * compile-time, even when NUMA is off and it does 1470e0ec90eeSDave Hansen * nothing. This helps the compiler optimize it out. 1471099730d6SDave Hansen */ 1472e0ec90eeSDave Hansen if (!IS_ENABLED(CONFIG_NUMA) || !vma) { 1473099730d6SDave Hansen /* 1474099730d6SDave Hansen * If a specific node is requested, make sure to 1475099730d6SDave Hansen * get memory from there, but only when a node 1476099730d6SDave Hansen * is explicitly specified. 1477099730d6SDave Hansen */ 1478099730d6SDave Hansen if (nid != NUMA_NO_NODE) 1479099730d6SDave Hansen gfp |= __GFP_THISNODE; 1480099730d6SDave Hansen /* 1481099730d6SDave Hansen * Make sure to call something that can handle 1482099730d6SDave Hansen * nid=NUMA_NO_NODE 1483099730d6SDave Hansen */ 1484099730d6SDave Hansen return alloc_pages_node(nid, gfp, order); 1485099730d6SDave Hansen } 1486099730d6SDave Hansen 1487099730d6SDave Hansen /* 1488099730d6SDave Hansen * OK, so we have a VMA. Fetch the mempolicy and try to 1489e0ec90eeSDave Hansen * allocate a huge page with it. We will only reach this 1490e0ec90eeSDave Hansen * when CONFIG_NUMA=y. 1491099730d6SDave Hansen */ 1492099730d6SDave Hansen do { 1493099730d6SDave Hansen struct page *page; 1494099730d6SDave Hansen struct mempolicy *mpol; 1495099730d6SDave Hansen struct zonelist *zl; 1496099730d6SDave Hansen nodemask_t *nodemask; 1497099730d6SDave Hansen 1498099730d6SDave Hansen cpuset_mems_cookie = read_mems_allowed_begin(); 1499099730d6SDave Hansen zl = huge_zonelist(vma, addr, gfp, &mpol, &nodemask); 1500099730d6SDave Hansen mpol_cond_put(mpol); 1501099730d6SDave Hansen page = __alloc_pages_nodemask(gfp, order, zl, nodemask); 1502099730d6SDave Hansen if (page) 1503099730d6SDave Hansen return page; 1504099730d6SDave Hansen } while (read_mems_allowed_retry(cpuset_mems_cookie)); 1505099730d6SDave Hansen 1506099730d6SDave Hansen return NULL; 1507099730d6SDave Hansen } 1508099730d6SDave Hansen 1509099730d6SDave Hansen /* 1510099730d6SDave Hansen * There are two ways to allocate a huge page: 1511099730d6SDave Hansen * 1. When you have a VMA and an address (like a fault) 1512099730d6SDave Hansen * 2. When you have no VMA (like when setting /proc/.../nr_hugepages) 1513099730d6SDave Hansen * 1514099730d6SDave Hansen * 'vma' and 'addr' are only for (1). 'nid' is always NUMA_NO_NODE in 1515099730d6SDave Hansen * this case which signifies that the allocation should be done with 1516099730d6SDave Hansen * respect for the VMA's memory policy. 1517099730d6SDave Hansen * 1518099730d6SDave Hansen * For (2), we ignore 'vma' and 'addr' and use 'nid' exclusively. This 1519099730d6SDave Hansen * implies that memory policies will not be taken in to account. 1520099730d6SDave Hansen */ 1521099730d6SDave Hansen static struct page *__alloc_buddy_huge_page(struct hstate *h, 1522099730d6SDave Hansen struct vm_area_struct *vma, unsigned long addr, int nid) 15237893d1d5SAdam Litke { 15247893d1d5SAdam Litke struct page *page; 1525bf50bab2SNaoya Horiguchi unsigned int r_nid; 15267893d1d5SAdam Litke 1527bae7f4aeSLuiz Capitulino if (hstate_is_gigantic(h)) 1528aa888a74SAndi Kleen return NULL; 1529aa888a74SAndi Kleen 1530d1c3fb1fSNishanth Aravamudan /* 1531099730d6SDave Hansen * Make sure that anyone specifying 'nid' is not also specifying a VMA. 1532099730d6SDave Hansen * This makes sure the caller is picking _one_ of the modes with which 1533099730d6SDave Hansen * we can call this function, not both. 1534099730d6SDave Hansen */ 1535099730d6SDave Hansen if (vma || (addr != -1)) { 1536e0ec90eeSDave Hansen VM_WARN_ON_ONCE(addr == -1); 1537e0ec90eeSDave Hansen VM_WARN_ON_ONCE(nid != NUMA_NO_NODE); 1538099730d6SDave Hansen } 1539099730d6SDave Hansen /* 1540d1c3fb1fSNishanth Aravamudan * Assume we will successfully allocate the surplus page to 1541d1c3fb1fSNishanth Aravamudan * prevent racing processes from causing the surplus to exceed 1542d1c3fb1fSNishanth Aravamudan * overcommit 1543d1c3fb1fSNishanth Aravamudan * 1544d1c3fb1fSNishanth Aravamudan * This however introduces a different race, where a process B 1545d1c3fb1fSNishanth Aravamudan * tries to grow the static hugepage pool while alloc_pages() is 1546d1c3fb1fSNishanth Aravamudan * called by process A. B will only examine the per-node 1547d1c3fb1fSNishanth Aravamudan * counters in determining if surplus huge pages can be 1548d1c3fb1fSNishanth Aravamudan * converted to normal huge pages in adjust_pool_surplus(). A 1549d1c3fb1fSNishanth Aravamudan * won't be able to increment the per-node counter, until the 1550d1c3fb1fSNishanth Aravamudan * lock is dropped by B, but B doesn't drop hugetlb_lock until 1551d1c3fb1fSNishanth Aravamudan * no more huge pages can be converted from surplus to normal 1552d1c3fb1fSNishanth Aravamudan * state (and doesn't try to convert again). Thus, we have a 1553d1c3fb1fSNishanth Aravamudan * case where a surplus huge page exists, the pool is grown, and 1554d1c3fb1fSNishanth Aravamudan * the surplus huge page still exists after, even though it 1555d1c3fb1fSNishanth Aravamudan * should just have been converted to a normal huge page. This 1556d1c3fb1fSNishanth Aravamudan * does not leak memory, though, as the hugepage will be freed 1557d1c3fb1fSNishanth Aravamudan * once it is out of use. It also does not allow the counters to 1558d1c3fb1fSNishanth Aravamudan * go out of whack in adjust_pool_surplus() as we don't modify 1559d1c3fb1fSNishanth Aravamudan * the node values until we've gotten the hugepage and only the 1560d1c3fb1fSNishanth Aravamudan * per-node value is checked there. 1561d1c3fb1fSNishanth Aravamudan */ 1562d1c3fb1fSNishanth Aravamudan spin_lock(&hugetlb_lock); 1563a5516438SAndi Kleen if (h->surplus_huge_pages >= h->nr_overcommit_huge_pages) { 1564d1c3fb1fSNishanth Aravamudan spin_unlock(&hugetlb_lock); 1565d1c3fb1fSNishanth Aravamudan return NULL; 1566d1c3fb1fSNishanth Aravamudan } else { 1567a5516438SAndi Kleen h->nr_huge_pages++; 1568a5516438SAndi Kleen h->surplus_huge_pages++; 1569d1c3fb1fSNishanth Aravamudan } 1570d1c3fb1fSNishanth Aravamudan spin_unlock(&hugetlb_lock); 1571d1c3fb1fSNishanth Aravamudan 1572099730d6SDave Hansen page = __hugetlb_alloc_buddy_huge_page(h, vma, addr, nid); 1573d1c3fb1fSNishanth Aravamudan 15747893d1d5SAdam Litke spin_lock(&hugetlb_lock); 1575d1c3fb1fSNishanth Aravamudan if (page) { 15760edaecfaSAneesh Kumar K.V INIT_LIST_HEAD(&page->lru); 1577bf50bab2SNaoya Horiguchi r_nid = page_to_nid(page); 1578f1e61557SKirill A. Shutemov set_compound_page_dtor(page, HUGETLB_PAGE_DTOR); 15799dd540e2SAneesh Kumar K.V set_hugetlb_cgroup(page, NULL); 1580d1c3fb1fSNishanth Aravamudan /* 1581d1c3fb1fSNishanth Aravamudan * We incremented the global counters already 1582d1c3fb1fSNishanth Aravamudan */ 1583bf50bab2SNaoya Horiguchi h->nr_huge_pages_node[r_nid]++; 1584bf50bab2SNaoya Horiguchi h->surplus_huge_pages_node[r_nid]++; 15853b116300SAdam Litke __count_vm_event(HTLB_BUDDY_PGALLOC); 1586d1c3fb1fSNishanth Aravamudan } else { 1587a5516438SAndi Kleen h->nr_huge_pages--; 1588a5516438SAndi Kleen h->surplus_huge_pages--; 15893b116300SAdam Litke __count_vm_event(HTLB_BUDDY_PGALLOC_FAIL); 15907893d1d5SAdam Litke } 1591d1c3fb1fSNishanth Aravamudan spin_unlock(&hugetlb_lock); 15927893d1d5SAdam Litke 15937893d1d5SAdam Litke return page; 15947893d1d5SAdam Litke } 15957893d1d5SAdam Litke 1596e4e574b7SAdam Litke /* 1597099730d6SDave Hansen * Allocate a huge page from 'nid'. Note, 'nid' may be 1598099730d6SDave Hansen * NUMA_NO_NODE, which means that it may be allocated 1599099730d6SDave Hansen * anywhere. 1600099730d6SDave Hansen */ 1601e0ec90eeSDave Hansen static 1602099730d6SDave Hansen struct page *__alloc_buddy_huge_page_no_mpol(struct hstate *h, int nid) 1603099730d6SDave Hansen { 1604099730d6SDave Hansen unsigned long addr = -1; 1605099730d6SDave Hansen 1606099730d6SDave Hansen return __alloc_buddy_huge_page(h, NULL, addr, nid); 1607099730d6SDave Hansen } 1608099730d6SDave Hansen 1609099730d6SDave Hansen /* 1610099730d6SDave Hansen * Use the VMA's mpolicy to allocate a huge page from the buddy. 1611099730d6SDave Hansen */ 1612e0ec90eeSDave Hansen static 1613099730d6SDave Hansen struct page *__alloc_buddy_huge_page_with_mpol(struct hstate *h, 1614099730d6SDave Hansen struct vm_area_struct *vma, unsigned long addr) 1615099730d6SDave Hansen { 1616099730d6SDave Hansen return __alloc_buddy_huge_page(h, vma, addr, NUMA_NO_NODE); 1617099730d6SDave Hansen } 1618099730d6SDave Hansen 1619099730d6SDave Hansen /* 1620bf50bab2SNaoya Horiguchi * This allocation function is useful in the context where vma is irrelevant. 1621bf50bab2SNaoya Horiguchi * E.g. soft-offlining uses this function because it only cares physical 1622bf50bab2SNaoya Horiguchi * address of error page. 1623bf50bab2SNaoya Horiguchi */ 1624bf50bab2SNaoya Horiguchi struct page *alloc_huge_page_node(struct hstate *h, int nid) 1625bf50bab2SNaoya Horiguchi { 16264ef91848SJoonsoo Kim struct page *page = NULL; 1627bf50bab2SNaoya Horiguchi 1628bf50bab2SNaoya Horiguchi spin_lock(&hugetlb_lock); 16294ef91848SJoonsoo Kim if (h->free_huge_pages - h->resv_huge_pages > 0) 1630bf50bab2SNaoya Horiguchi page = dequeue_huge_page_node(h, nid); 1631bf50bab2SNaoya Horiguchi spin_unlock(&hugetlb_lock); 1632bf50bab2SNaoya Horiguchi 163394ae8ba7SAneesh Kumar K.V if (!page) 1634099730d6SDave Hansen page = __alloc_buddy_huge_page_no_mpol(h, nid); 1635bf50bab2SNaoya Horiguchi 1636bf50bab2SNaoya Horiguchi return page; 1637bf50bab2SNaoya Horiguchi } 1638bf50bab2SNaoya Horiguchi 1639bf50bab2SNaoya Horiguchi /* 164025985edcSLucas De Marchi * Increase the hugetlb pool such that it can accommodate a reservation 1641e4e574b7SAdam Litke * of size 'delta'. 1642e4e574b7SAdam Litke */ 1643a5516438SAndi Kleen static int gather_surplus_pages(struct hstate *h, int delta) 1644e4e574b7SAdam Litke { 1645e4e574b7SAdam Litke struct list_head surplus_list; 1646e4e574b7SAdam Litke struct page *page, *tmp; 1647e4e574b7SAdam Litke int ret, i; 1648e4e574b7SAdam Litke int needed, allocated; 164928073b02SHillf Danton bool alloc_ok = true; 1650e4e574b7SAdam Litke 1651a5516438SAndi Kleen needed = (h->resv_huge_pages + delta) - h->free_huge_pages; 1652ac09b3a1SAdam Litke if (needed <= 0) { 1653a5516438SAndi Kleen h->resv_huge_pages += delta; 1654e4e574b7SAdam Litke return 0; 1655ac09b3a1SAdam Litke } 1656e4e574b7SAdam Litke 1657e4e574b7SAdam Litke allocated = 0; 1658e4e574b7SAdam Litke INIT_LIST_HEAD(&surplus_list); 1659e4e574b7SAdam Litke 1660e4e574b7SAdam Litke ret = -ENOMEM; 1661e4e574b7SAdam Litke retry: 1662e4e574b7SAdam Litke spin_unlock(&hugetlb_lock); 1663e4e574b7SAdam Litke for (i = 0; i < needed; i++) { 1664099730d6SDave Hansen page = __alloc_buddy_huge_page_no_mpol(h, NUMA_NO_NODE); 166528073b02SHillf Danton if (!page) { 166628073b02SHillf Danton alloc_ok = false; 166728073b02SHillf Danton break; 166828073b02SHillf Danton } 1669e4e574b7SAdam Litke list_add(&page->lru, &surplus_list); 1670e4e574b7SAdam Litke } 167128073b02SHillf Danton allocated += i; 1672e4e574b7SAdam Litke 1673e4e574b7SAdam Litke /* 1674e4e574b7SAdam Litke * After retaking hugetlb_lock, we need to recalculate 'needed' 1675e4e574b7SAdam Litke * because either resv_huge_pages or free_huge_pages may have changed. 1676e4e574b7SAdam Litke */ 1677e4e574b7SAdam Litke spin_lock(&hugetlb_lock); 1678a5516438SAndi Kleen needed = (h->resv_huge_pages + delta) - 1679a5516438SAndi Kleen (h->free_huge_pages + allocated); 168028073b02SHillf Danton if (needed > 0) { 168128073b02SHillf Danton if (alloc_ok) 1682e4e574b7SAdam Litke goto retry; 168328073b02SHillf Danton /* 168428073b02SHillf Danton * We were not able to allocate enough pages to 168528073b02SHillf Danton * satisfy the entire reservation so we free what 168628073b02SHillf Danton * we've allocated so far. 168728073b02SHillf Danton */ 168828073b02SHillf Danton goto free; 168928073b02SHillf Danton } 1690e4e574b7SAdam Litke /* 1691e4e574b7SAdam Litke * The surplus_list now contains _at_least_ the number of extra pages 169225985edcSLucas De Marchi * needed to accommodate the reservation. Add the appropriate number 1693e4e574b7SAdam Litke * of pages to the hugetlb pool and free the extras back to the buddy 1694ac09b3a1SAdam Litke * allocator. Commit the entire reservation here to prevent another 1695ac09b3a1SAdam Litke * process from stealing the pages as they are added to the pool but 1696ac09b3a1SAdam Litke * before they are reserved. 1697e4e574b7SAdam Litke */ 1698e4e574b7SAdam Litke needed += allocated; 1699a5516438SAndi Kleen h->resv_huge_pages += delta; 1700e4e574b7SAdam Litke ret = 0; 1701a9869b83SNaoya Horiguchi 170219fc3f0aSAdam Litke /* Free the needed pages to the hugetlb pool */ 170319fc3f0aSAdam Litke list_for_each_entry_safe(page, tmp, &surplus_list, lru) { 170419fc3f0aSAdam Litke if ((--needed) < 0) 170519fc3f0aSAdam Litke break; 1706a9869b83SNaoya Horiguchi /* 1707a9869b83SNaoya Horiguchi * This page is now managed by the hugetlb allocator and has 1708a9869b83SNaoya Horiguchi * no users -- drop the buddy allocator's reference. 1709a9869b83SNaoya Horiguchi */ 1710a9869b83SNaoya Horiguchi put_page_testzero(page); 1711309381feSSasha Levin VM_BUG_ON_PAGE(page_count(page), page); 1712a5516438SAndi Kleen enqueue_huge_page(h, page); 171319fc3f0aSAdam Litke } 171428073b02SHillf Danton free: 1715b0365c8dSHillf Danton spin_unlock(&hugetlb_lock); 171619fc3f0aSAdam Litke 171719fc3f0aSAdam Litke /* Free unnecessary surplus pages to the buddy allocator */ 1718c0d934baSJoonsoo Kim list_for_each_entry_safe(page, tmp, &surplus_list, lru) 1719a9869b83SNaoya Horiguchi put_page(page); 172019fc3f0aSAdam Litke spin_lock(&hugetlb_lock); 1721e4e574b7SAdam Litke 1722e4e574b7SAdam Litke return ret; 1723e4e574b7SAdam Litke } 1724e4e574b7SAdam Litke 1725e4e574b7SAdam Litke /* 1726e4e574b7SAdam Litke * When releasing a hugetlb pool reservation, any surplus pages that were 1727e4e574b7SAdam Litke * allocated to satisfy the reservation must be explicitly freed if they were 1728e4e574b7SAdam Litke * never used. 1729685f3457SLee Schermerhorn * Called with hugetlb_lock held. 1730e4e574b7SAdam Litke */ 1731a5516438SAndi Kleen static void return_unused_surplus_pages(struct hstate *h, 1732a5516438SAndi Kleen unsigned long unused_resv_pages) 1733e4e574b7SAdam Litke { 1734e4e574b7SAdam Litke unsigned long nr_pages; 1735e4e574b7SAdam Litke 1736ac09b3a1SAdam Litke /* Uncommit the reservation */ 1737a5516438SAndi Kleen h->resv_huge_pages -= unused_resv_pages; 1738ac09b3a1SAdam Litke 1739aa888a74SAndi Kleen /* Cannot return gigantic pages currently */ 1740bae7f4aeSLuiz Capitulino if (hstate_is_gigantic(h)) 1741aa888a74SAndi Kleen return; 1742aa888a74SAndi Kleen 1743a5516438SAndi Kleen nr_pages = min(unused_resv_pages, h->surplus_huge_pages); 1744e4e574b7SAdam Litke 1745685f3457SLee Schermerhorn /* 1746685f3457SLee Schermerhorn * We want to release as many surplus pages as possible, spread 17479b5e5d0fSLee Schermerhorn * evenly across all nodes with memory. Iterate across these nodes 17489b5e5d0fSLee Schermerhorn * until we can no longer free unreserved surplus pages. This occurs 17499b5e5d0fSLee Schermerhorn * when the nodes with surplus pages have no free pages. 17509b5e5d0fSLee Schermerhorn * free_pool_huge_page() will balance the the freed pages across the 17519b5e5d0fSLee Schermerhorn * on-line nodes with memory and will handle the hstate accounting. 1752685f3457SLee Schermerhorn */ 1753685f3457SLee Schermerhorn while (nr_pages--) { 17548cebfcd0SLai Jiangshan if (!free_pool_huge_page(h, &node_states[N_MEMORY], 1)) 1755685f3457SLee Schermerhorn break; 17567848a4bfSMizuma, Masayoshi cond_resched_lock(&hugetlb_lock); 1757e4e574b7SAdam Litke } 1758e4e574b7SAdam Litke } 1759e4e574b7SAdam Litke 17605e911373SMike Kravetz 1761c37f9fb1SAndy Whitcroft /* 1762feba16e2SMike Kravetz * vma_needs_reservation, vma_commit_reservation and vma_end_reservation 17635e911373SMike Kravetz * are used by the huge page allocation routines to manage reservations. 1764cf3ad20bSMike Kravetz * 1765cf3ad20bSMike Kravetz * vma_needs_reservation is called to determine if the huge page at addr 1766cf3ad20bSMike Kravetz * within the vma has an associated reservation. If a reservation is 1767cf3ad20bSMike Kravetz * needed, the value 1 is returned. The caller is then responsible for 1768cf3ad20bSMike Kravetz * managing the global reservation and subpool usage counts. After 1769cf3ad20bSMike Kravetz * the huge page has been allocated, vma_commit_reservation is called 1770feba16e2SMike Kravetz * to add the page to the reservation map. If the page allocation fails, 1771feba16e2SMike Kravetz * the reservation must be ended instead of committed. vma_end_reservation 1772feba16e2SMike Kravetz * is called in such cases. 1773cf3ad20bSMike Kravetz * 1774cf3ad20bSMike Kravetz * In the normal case, vma_commit_reservation returns the same value 1775cf3ad20bSMike Kravetz * as the preceding vma_needs_reservation call. The only time this 1776cf3ad20bSMike Kravetz * is not the case is if a reserve map was changed between calls. It 1777cf3ad20bSMike Kravetz * is the responsibility of the caller to notice the difference and 1778cf3ad20bSMike Kravetz * take appropriate action. 1779c37f9fb1SAndy Whitcroft */ 17805e911373SMike Kravetz enum vma_resv_mode { 17815e911373SMike Kravetz VMA_NEEDS_RESV, 17825e911373SMike Kravetz VMA_COMMIT_RESV, 1783feba16e2SMike Kravetz VMA_END_RESV, 17845e911373SMike Kravetz }; 1785cf3ad20bSMike Kravetz static long __vma_reservation_common(struct hstate *h, 1786cf3ad20bSMike Kravetz struct vm_area_struct *vma, unsigned long addr, 17875e911373SMike Kravetz enum vma_resv_mode mode) 1788c37f9fb1SAndy Whitcroft { 17894e35f483SJoonsoo Kim struct resv_map *resv; 17904e35f483SJoonsoo Kim pgoff_t idx; 1791cf3ad20bSMike Kravetz long ret; 1792c37f9fb1SAndy Whitcroft 17934e35f483SJoonsoo Kim resv = vma_resv_map(vma); 17944e35f483SJoonsoo Kim if (!resv) 1795c37f9fb1SAndy Whitcroft return 1; 1796c37f9fb1SAndy Whitcroft 17974e35f483SJoonsoo Kim idx = vma_hugecache_offset(h, vma, addr); 17985e911373SMike Kravetz switch (mode) { 17995e911373SMike Kravetz case VMA_NEEDS_RESV: 1800cf3ad20bSMike Kravetz ret = region_chg(resv, idx, idx + 1); 18015e911373SMike Kravetz break; 18025e911373SMike Kravetz case VMA_COMMIT_RESV: 18035e911373SMike Kravetz ret = region_add(resv, idx, idx + 1); 18045e911373SMike Kravetz break; 1805feba16e2SMike Kravetz case VMA_END_RESV: 18065e911373SMike Kravetz region_abort(resv, idx, idx + 1); 18075e911373SMike Kravetz ret = 0; 18085e911373SMike Kravetz break; 18095e911373SMike Kravetz default: 18105e911373SMike Kravetz BUG(); 18115e911373SMike Kravetz } 181284afd99bSAndy Whitcroft 18134e35f483SJoonsoo Kim if (vma->vm_flags & VM_MAYSHARE) 1814cf3ad20bSMike Kravetz return ret; 18154e35f483SJoonsoo Kim else 1816cf3ad20bSMike Kravetz return ret < 0 ? ret : 0; 181784afd99bSAndy Whitcroft } 1818cf3ad20bSMike Kravetz 1819cf3ad20bSMike Kravetz static long vma_needs_reservation(struct hstate *h, 1820a5516438SAndi Kleen struct vm_area_struct *vma, unsigned long addr) 1821c37f9fb1SAndy Whitcroft { 18225e911373SMike Kravetz return __vma_reservation_common(h, vma, addr, VMA_NEEDS_RESV); 1823cf3ad20bSMike Kravetz } 1824c37f9fb1SAndy Whitcroft 1825cf3ad20bSMike Kravetz static long vma_commit_reservation(struct hstate *h, 1826cf3ad20bSMike Kravetz struct vm_area_struct *vma, unsigned long addr) 1827cf3ad20bSMike Kravetz { 18285e911373SMike Kravetz return __vma_reservation_common(h, vma, addr, VMA_COMMIT_RESV); 18295e911373SMike Kravetz } 18305e911373SMike Kravetz 1831feba16e2SMike Kravetz static void vma_end_reservation(struct hstate *h, 18325e911373SMike Kravetz struct vm_area_struct *vma, unsigned long addr) 18335e911373SMike Kravetz { 1834feba16e2SMike Kravetz (void)__vma_reservation_common(h, vma, addr, VMA_END_RESV); 1835c37f9fb1SAndy Whitcroft } 1836c37f9fb1SAndy Whitcroft 183770c3547eSMike Kravetz struct page *alloc_huge_page(struct vm_area_struct *vma, 183804f2cbe3SMel Gorman unsigned long addr, int avoid_reserve) 1839348ea204SAdam Litke { 184090481622SDavid Gibson struct hugepage_subpool *spool = subpool_vma(vma); 1841a5516438SAndi Kleen struct hstate *h = hstate_vma(vma); 1842348ea204SAdam Litke struct page *page; 1843d85f69b0SMike Kravetz long map_chg, map_commit; 1844d85f69b0SMike Kravetz long gbl_chg; 18456d76dcf4SAneesh Kumar K.V int ret, idx; 18466d76dcf4SAneesh Kumar K.V struct hugetlb_cgroup *h_cg; 18472fc39cecSAdam Litke 18486d76dcf4SAneesh Kumar K.V idx = hstate_index(h); 1849a1e78772SMel Gorman /* 1850d85f69b0SMike Kravetz * Examine the region/reserve map to determine if the process 1851d85f69b0SMike Kravetz * has a reservation for the page to be allocated. A return 1852d85f69b0SMike Kravetz * code of zero indicates a reservation exists (no change). 1853a1e78772SMel Gorman */ 1854d85f69b0SMike Kravetz map_chg = gbl_chg = vma_needs_reservation(h, vma, addr); 1855d85f69b0SMike Kravetz if (map_chg < 0) 185676dcee75SAneesh Kumar K.V return ERR_PTR(-ENOMEM); 1857d85f69b0SMike Kravetz 1858d85f69b0SMike Kravetz /* 1859d85f69b0SMike Kravetz * Processes that did not create the mapping will have no 1860d85f69b0SMike Kravetz * reserves as indicated by the region/reserve map. Check 1861d85f69b0SMike Kravetz * that the allocation will not exceed the subpool limit. 1862d85f69b0SMike Kravetz * Allocations for MAP_NORESERVE mappings also need to be 1863d85f69b0SMike Kravetz * checked against any subpool limit. 1864d85f69b0SMike Kravetz */ 1865d85f69b0SMike Kravetz if (map_chg || avoid_reserve) { 1866d85f69b0SMike Kravetz gbl_chg = hugepage_subpool_get_pages(spool, 1); 1867d85f69b0SMike Kravetz if (gbl_chg < 0) { 1868feba16e2SMike Kravetz vma_end_reservation(h, vma, addr); 186976dcee75SAneesh Kumar K.V return ERR_PTR(-ENOSPC); 18705e911373SMike Kravetz } 187190d8b7e6SAdam Litke 1872d85f69b0SMike Kravetz /* 1873d85f69b0SMike Kravetz * Even though there was no reservation in the region/reserve 1874d85f69b0SMike Kravetz * map, there could be reservations associated with the 1875d85f69b0SMike Kravetz * subpool that can be used. This would be indicated if the 1876d85f69b0SMike Kravetz * return value of hugepage_subpool_get_pages() is zero. 1877d85f69b0SMike Kravetz * However, if avoid_reserve is specified we still avoid even 1878d85f69b0SMike Kravetz * the subpool reservations. 1879d85f69b0SMike Kravetz */ 1880d85f69b0SMike Kravetz if (avoid_reserve) 1881d85f69b0SMike Kravetz gbl_chg = 1; 1882d85f69b0SMike Kravetz } 1883d85f69b0SMike Kravetz 18846d76dcf4SAneesh Kumar K.V ret = hugetlb_cgroup_charge_cgroup(idx, pages_per_huge_page(h), &h_cg); 18858f34af6fSJianyu Zhan if (ret) 18868f34af6fSJianyu Zhan goto out_subpool_put; 18878f34af6fSJianyu Zhan 1888a1e78772SMel Gorman spin_lock(&hugetlb_lock); 1889d85f69b0SMike Kravetz /* 1890d85f69b0SMike Kravetz * glb_chg is passed to indicate whether or not a page must be taken 1891d85f69b0SMike Kravetz * from the global free pool (global change). gbl_chg == 0 indicates 1892d85f69b0SMike Kravetz * a reservation exists for the allocation. 1893d85f69b0SMike Kravetz */ 1894d85f69b0SMike Kravetz page = dequeue_huge_page_vma(h, vma, addr, avoid_reserve, gbl_chg); 189581a6fcaeSJoonsoo Kim if (!page) { 189694ae8ba7SAneesh Kumar K.V spin_unlock(&hugetlb_lock); 1897099730d6SDave Hansen page = __alloc_buddy_huge_page_with_mpol(h, vma, addr); 18988f34af6fSJianyu Zhan if (!page) 18998f34af6fSJianyu Zhan goto out_uncharge_cgroup; 1900a88c7695SNaoya Horiguchi if (!avoid_reserve && vma_has_reserves(vma, gbl_chg)) { 1901a88c7695SNaoya Horiguchi SetPagePrivate(page); 1902a88c7695SNaoya Horiguchi h->resv_huge_pages--; 1903a88c7695SNaoya Horiguchi } 190479dbb236SAneesh Kumar K.V spin_lock(&hugetlb_lock); 190579dbb236SAneesh Kumar K.V list_move(&page->lru, &h->hugepage_activelist); 190681a6fcaeSJoonsoo Kim /* Fall through */ 1907a1e78772SMel Gorman } 190881a6fcaeSJoonsoo Kim hugetlb_cgroup_commit_charge(idx, pages_per_huge_page(h), h_cg, page); 190981a6fcaeSJoonsoo Kim spin_unlock(&hugetlb_lock); 1910a1e78772SMel Gorman 191190481622SDavid Gibson set_page_private(page, (unsigned long)spool); 1912a1e78772SMel Gorman 1913d85f69b0SMike Kravetz map_commit = vma_commit_reservation(h, vma, addr); 1914d85f69b0SMike Kravetz if (unlikely(map_chg > map_commit)) { 191533039678SMike Kravetz /* 191633039678SMike Kravetz * The page was added to the reservation map between 191733039678SMike Kravetz * vma_needs_reservation and vma_commit_reservation. 191833039678SMike Kravetz * This indicates a race with hugetlb_reserve_pages. 191933039678SMike Kravetz * Adjust for the subpool count incremented above AND 192033039678SMike Kravetz * in hugetlb_reserve_pages for the same page. Also, 192133039678SMike Kravetz * the reservation count added in hugetlb_reserve_pages 192233039678SMike Kravetz * no longer applies. 192333039678SMike Kravetz */ 192433039678SMike Kravetz long rsv_adjust; 192533039678SMike Kravetz 192633039678SMike Kravetz rsv_adjust = hugepage_subpool_put_pages(spool, 1); 192733039678SMike Kravetz hugetlb_acct_memory(h, -rsv_adjust); 192833039678SMike Kravetz } 19297893d1d5SAdam Litke return page; 19308f34af6fSJianyu Zhan 19318f34af6fSJianyu Zhan out_uncharge_cgroup: 19328f34af6fSJianyu Zhan hugetlb_cgroup_uncharge_cgroup(idx, pages_per_huge_page(h), h_cg); 19338f34af6fSJianyu Zhan out_subpool_put: 1934d85f69b0SMike Kravetz if (map_chg || avoid_reserve) 19358f34af6fSJianyu Zhan hugepage_subpool_put_pages(spool, 1); 1936feba16e2SMike Kravetz vma_end_reservation(h, vma, addr); 19378f34af6fSJianyu Zhan return ERR_PTR(-ENOSPC); 1938b45b5bd6SDavid Gibson } 1939b45b5bd6SDavid Gibson 194074060e4dSNaoya Horiguchi /* 194174060e4dSNaoya Horiguchi * alloc_huge_page()'s wrapper which simply returns the page if allocation 194274060e4dSNaoya Horiguchi * succeeds, otherwise NULL. This function is called from new_vma_page(), 194374060e4dSNaoya Horiguchi * where no ERR_VALUE is expected to be returned. 194474060e4dSNaoya Horiguchi */ 194574060e4dSNaoya Horiguchi struct page *alloc_huge_page_noerr(struct vm_area_struct *vma, 194674060e4dSNaoya Horiguchi unsigned long addr, int avoid_reserve) 194774060e4dSNaoya Horiguchi { 194874060e4dSNaoya Horiguchi struct page *page = alloc_huge_page(vma, addr, avoid_reserve); 194974060e4dSNaoya Horiguchi if (IS_ERR(page)) 195074060e4dSNaoya Horiguchi page = NULL; 195174060e4dSNaoya Horiguchi return page; 195274060e4dSNaoya Horiguchi } 195374060e4dSNaoya Horiguchi 195491f47662SCyrill Gorcunov int __weak alloc_bootmem_huge_page(struct hstate *h) 1955aa888a74SAndi Kleen { 1956aa888a74SAndi Kleen struct huge_bootmem_page *m; 1957b2261026SJoonsoo Kim int nr_nodes, node; 1958aa888a74SAndi Kleen 1959b2261026SJoonsoo Kim for_each_node_mask_to_alloc(h, nr_nodes, node, &node_states[N_MEMORY]) { 1960aa888a74SAndi Kleen void *addr; 1961aa888a74SAndi Kleen 19628b89a116SGrygorii Strashko addr = memblock_virt_alloc_try_nid_nopanic( 19638b89a116SGrygorii Strashko huge_page_size(h), huge_page_size(h), 19648b89a116SGrygorii Strashko 0, BOOTMEM_ALLOC_ACCESSIBLE, node); 1965aa888a74SAndi Kleen if (addr) { 1966aa888a74SAndi Kleen /* 1967aa888a74SAndi Kleen * Use the beginning of the huge page to store the 1968aa888a74SAndi Kleen * huge_bootmem_page struct (until gather_bootmem 1969aa888a74SAndi Kleen * puts them into the mem_map). 1970aa888a74SAndi Kleen */ 1971aa888a74SAndi Kleen m = addr; 1972aa888a74SAndi Kleen goto found; 1973aa888a74SAndi Kleen } 1974aa888a74SAndi Kleen } 1975aa888a74SAndi Kleen return 0; 1976aa888a74SAndi Kleen 1977aa888a74SAndi Kleen found: 1978df994eadSLuiz Capitulino BUG_ON(!IS_ALIGNED(virt_to_phys(m), huge_page_size(h))); 1979aa888a74SAndi Kleen /* Put them into a private list first because mem_map is not up yet */ 1980aa888a74SAndi Kleen list_add(&m->list, &huge_boot_pages); 1981aa888a74SAndi Kleen m->hstate = h; 1982aa888a74SAndi Kleen return 1; 1983aa888a74SAndi Kleen } 1984aa888a74SAndi Kleen 1985d00181b9SKirill A. Shutemov static void __init prep_compound_huge_page(struct page *page, 1986d00181b9SKirill A. Shutemov unsigned int order) 198718229df5SAndy Whitcroft { 198818229df5SAndy Whitcroft if (unlikely(order > (MAX_ORDER - 1))) 198918229df5SAndy Whitcroft prep_compound_gigantic_page(page, order); 199018229df5SAndy Whitcroft else 199118229df5SAndy Whitcroft prep_compound_page(page, order); 199218229df5SAndy Whitcroft } 199318229df5SAndy Whitcroft 1994aa888a74SAndi Kleen /* Put bootmem huge pages into the standard lists after mem_map is up */ 1995aa888a74SAndi Kleen static void __init gather_bootmem_prealloc(void) 1996aa888a74SAndi Kleen { 1997aa888a74SAndi Kleen struct huge_bootmem_page *m; 1998aa888a74SAndi Kleen 1999aa888a74SAndi Kleen list_for_each_entry(m, &huge_boot_pages, list) { 2000aa888a74SAndi Kleen struct hstate *h = m->hstate; 2001ee8f248dSBecky Bruce struct page *page; 2002ee8f248dSBecky Bruce 2003ee8f248dSBecky Bruce #ifdef CONFIG_HIGHMEM 2004ee8f248dSBecky Bruce page = pfn_to_page(m->phys >> PAGE_SHIFT); 20058b89a116SGrygorii Strashko memblock_free_late(__pa(m), 2006ee8f248dSBecky Bruce sizeof(struct huge_bootmem_page)); 2007ee8f248dSBecky Bruce #else 2008ee8f248dSBecky Bruce page = virt_to_page(m); 2009ee8f248dSBecky Bruce #endif 2010aa888a74SAndi Kleen WARN_ON(page_count(page) != 1); 201118229df5SAndy Whitcroft prep_compound_huge_page(page, h->order); 2012ef5a22beSAndrea Arcangeli WARN_ON(PageReserved(page)); 2013aa888a74SAndi Kleen prep_new_huge_page(h, page, page_to_nid(page)); 2014b0320c7bSRafael Aquini /* 2015b0320c7bSRafael Aquini * If we had gigantic hugepages allocated at boot time, we need 2016b0320c7bSRafael Aquini * to restore the 'stolen' pages to totalram_pages in order to 2017b0320c7bSRafael Aquini * fix confusing memory reports from free(1) and another 2018b0320c7bSRafael Aquini * side-effects, like CommitLimit going negative. 2019b0320c7bSRafael Aquini */ 2020bae7f4aeSLuiz Capitulino if (hstate_is_gigantic(h)) 20213dcc0571SJiang Liu adjust_managed_page_count(page, 1 << h->order); 2022aa888a74SAndi Kleen } 2023aa888a74SAndi Kleen } 2024aa888a74SAndi Kleen 20258faa8b07SAndi Kleen static void __init hugetlb_hstate_alloc_pages(struct hstate *h) 20261da177e4SLinus Torvalds { 20271da177e4SLinus Torvalds unsigned long i; 20281da177e4SLinus Torvalds 2029e5ff2159SAndi Kleen for (i = 0; i < h->max_huge_pages; ++i) { 2030bae7f4aeSLuiz Capitulino if (hstate_is_gigantic(h)) { 2031aa888a74SAndi Kleen if (!alloc_bootmem_huge_page(h)) 2032aa888a74SAndi Kleen break; 20339b5e5d0fSLee Schermerhorn } else if (!alloc_fresh_huge_page(h, 20348cebfcd0SLai Jiangshan &node_states[N_MEMORY])) 20351da177e4SLinus Torvalds break; 20361da177e4SLinus Torvalds } 20378faa8b07SAndi Kleen h->max_huge_pages = i; 2038e5ff2159SAndi Kleen } 2039e5ff2159SAndi Kleen 2040e5ff2159SAndi Kleen static void __init hugetlb_init_hstates(void) 2041e5ff2159SAndi Kleen { 2042e5ff2159SAndi Kleen struct hstate *h; 2043e5ff2159SAndi Kleen 2044e5ff2159SAndi Kleen for_each_hstate(h) { 2045641844f5SNaoya Horiguchi if (minimum_order > huge_page_order(h)) 2046641844f5SNaoya Horiguchi minimum_order = huge_page_order(h); 2047641844f5SNaoya Horiguchi 20488faa8b07SAndi Kleen /* oversize hugepages were init'ed in early boot */ 2049bae7f4aeSLuiz Capitulino if (!hstate_is_gigantic(h)) 20508faa8b07SAndi Kleen hugetlb_hstate_alloc_pages(h); 2051e5ff2159SAndi Kleen } 2052641844f5SNaoya Horiguchi VM_BUG_ON(minimum_order == UINT_MAX); 2053e5ff2159SAndi Kleen } 2054e5ff2159SAndi Kleen 20554abd32dbSAndi Kleen static char * __init memfmt(char *buf, unsigned long n) 20564abd32dbSAndi Kleen { 20574abd32dbSAndi Kleen if (n >= (1UL << 30)) 20584abd32dbSAndi Kleen sprintf(buf, "%lu GB", n >> 30); 20594abd32dbSAndi Kleen else if (n >= (1UL << 20)) 20604abd32dbSAndi Kleen sprintf(buf, "%lu MB", n >> 20); 20614abd32dbSAndi Kleen else 20624abd32dbSAndi Kleen sprintf(buf, "%lu KB", n >> 10); 20634abd32dbSAndi Kleen return buf; 20644abd32dbSAndi Kleen } 20654abd32dbSAndi Kleen 2066e5ff2159SAndi Kleen static void __init report_hugepages(void) 2067e5ff2159SAndi Kleen { 2068e5ff2159SAndi Kleen struct hstate *h; 2069e5ff2159SAndi Kleen 2070e5ff2159SAndi Kleen for_each_hstate(h) { 20714abd32dbSAndi Kleen char buf[32]; 2072ffb22af5SAndrew Morton pr_info("HugeTLB registered %s page size, pre-allocated %ld pages\n", 20734abd32dbSAndi Kleen memfmt(buf, huge_page_size(h)), 20744abd32dbSAndi Kleen h->free_huge_pages); 2075e5ff2159SAndi Kleen } 2076e5ff2159SAndi Kleen } 2077e5ff2159SAndi Kleen 20781da177e4SLinus Torvalds #ifdef CONFIG_HIGHMEM 20796ae11b27SLee Schermerhorn static void try_to_free_low(struct hstate *h, unsigned long count, 20806ae11b27SLee Schermerhorn nodemask_t *nodes_allowed) 20811da177e4SLinus Torvalds { 20824415cc8dSChristoph Lameter int i; 20834415cc8dSChristoph Lameter 2084bae7f4aeSLuiz Capitulino if (hstate_is_gigantic(h)) 2085aa888a74SAndi Kleen return; 2086aa888a74SAndi Kleen 20876ae11b27SLee Schermerhorn for_each_node_mask(i, *nodes_allowed) { 20881da177e4SLinus Torvalds struct page *page, *next; 2089a5516438SAndi Kleen struct list_head *freel = &h->hugepage_freelists[i]; 2090a5516438SAndi Kleen list_for_each_entry_safe(page, next, freel, lru) { 2091a5516438SAndi Kleen if (count >= h->nr_huge_pages) 20926b0c880dSAdam Litke return; 20931da177e4SLinus Torvalds if (PageHighMem(page)) 20941da177e4SLinus Torvalds continue; 20951da177e4SLinus Torvalds list_del(&page->lru); 2096e5ff2159SAndi Kleen update_and_free_page(h, page); 2097a5516438SAndi Kleen h->free_huge_pages--; 2098a5516438SAndi Kleen h->free_huge_pages_node[page_to_nid(page)]--; 20991da177e4SLinus Torvalds } 21001da177e4SLinus Torvalds } 21011da177e4SLinus Torvalds } 21021da177e4SLinus Torvalds #else 21036ae11b27SLee Schermerhorn static inline void try_to_free_low(struct hstate *h, unsigned long count, 21046ae11b27SLee Schermerhorn nodemask_t *nodes_allowed) 21051da177e4SLinus Torvalds { 21061da177e4SLinus Torvalds } 21071da177e4SLinus Torvalds #endif 21081da177e4SLinus Torvalds 210920a0307cSWu Fengguang /* 211020a0307cSWu Fengguang * Increment or decrement surplus_huge_pages. Keep node-specific counters 211120a0307cSWu Fengguang * balanced by operating on them in a round-robin fashion. 211220a0307cSWu Fengguang * Returns 1 if an adjustment was made. 211320a0307cSWu Fengguang */ 21146ae11b27SLee Schermerhorn static int adjust_pool_surplus(struct hstate *h, nodemask_t *nodes_allowed, 21156ae11b27SLee Schermerhorn int delta) 211620a0307cSWu Fengguang { 2117b2261026SJoonsoo Kim int nr_nodes, node; 211820a0307cSWu Fengguang 211920a0307cSWu Fengguang VM_BUG_ON(delta != -1 && delta != 1); 212020a0307cSWu Fengguang 2121e8c5c824SLee Schermerhorn if (delta < 0) { 2122b2261026SJoonsoo Kim for_each_node_mask_to_alloc(h, nr_nodes, node, nodes_allowed) { 2123b2261026SJoonsoo Kim if (h->surplus_huge_pages_node[node]) 2124b2261026SJoonsoo Kim goto found; 2125b2261026SJoonsoo Kim } 2126b2261026SJoonsoo Kim } else { 2127b2261026SJoonsoo Kim for_each_node_mask_to_free(h, nr_nodes, node, nodes_allowed) { 2128b2261026SJoonsoo Kim if (h->surplus_huge_pages_node[node] < 2129b2261026SJoonsoo Kim h->nr_huge_pages_node[node]) 2130b2261026SJoonsoo Kim goto found; 2131e8c5c824SLee Schermerhorn } 21329a76db09SLee Schermerhorn } 2133b2261026SJoonsoo Kim return 0; 213420a0307cSWu Fengguang 2135b2261026SJoonsoo Kim found: 213620a0307cSWu Fengguang h->surplus_huge_pages += delta; 2137b2261026SJoonsoo Kim h->surplus_huge_pages_node[node] += delta; 2138b2261026SJoonsoo Kim return 1; 213920a0307cSWu Fengguang } 214020a0307cSWu Fengguang 2141a5516438SAndi Kleen #define persistent_huge_pages(h) (h->nr_huge_pages - h->surplus_huge_pages) 21426ae11b27SLee Schermerhorn static unsigned long set_max_huge_pages(struct hstate *h, unsigned long count, 21436ae11b27SLee Schermerhorn nodemask_t *nodes_allowed) 21441da177e4SLinus Torvalds { 21457893d1d5SAdam Litke unsigned long min_count, ret; 21461da177e4SLinus Torvalds 2147944d9fecSLuiz Capitulino if (hstate_is_gigantic(h) && !gigantic_page_supported()) 2148aa888a74SAndi Kleen return h->max_huge_pages; 2149aa888a74SAndi Kleen 21507893d1d5SAdam Litke /* 21517893d1d5SAdam Litke * Increase the pool size 21527893d1d5SAdam Litke * First take pages out of surplus state. Then make up the 21537893d1d5SAdam Litke * remaining difference by allocating fresh huge pages. 2154d1c3fb1fSNishanth Aravamudan * 2155d15c7c09SNaoya Horiguchi * We might race with __alloc_buddy_huge_page() here and be unable 2156d1c3fb1fSNishanth Aravamudan * to convert a surplus huge page to a normal huge page. That is 2157d1c3fb1fSNishanth Aravamudan * not critical, though, it just means the overall size of the 2158d1c3fb1fSNishanth Aravamudan * pool might be one hugepage larger than it needs to be, but 2159d1c3fb1fSNishanth Aravamudan * within all the constraints specified by the sysctls. 21607893d1d5SAdam Litke */ 21611da177e4SLinus Torvalds spin_lock(&hugetlb_lock); 2162a5516438SAndi Kleen while (h->surplus_huge_pages && count > persistent_huge_pages(h)) { 21636ae11b27SLee Schermerhorn if (!adjust_pool_surplus(h, nodes_allowed, -1)) 21647893d1d5SAdam Litke break; 21657893d1d5SAdam Litke } 21667893d1d5SAdam Litke 2167a5516438SAndi Kleen while (count > persistent_huge_pages(h)) { 21687893d1d5SAdam Litke /* 21697893d1d5SAdam Litke * If this allocation races such that we no longer need the 21707893d1d5SAdam Litke * page, free_huge_page will handle it by freeing the page 21717893d1d5SAdam Litke * and reducing the surplus. 21727893d1d5SAdam Litke */ 21737893d1d5SAdam Litke spin_unlock(&hugetlb_lock); 2174944d9fecSLuiz Capitulino if (hstate_is_gigantic(h)) 2175944d9fecSLuiz Capitulino ret = alloc_fresh_gigantic_page(h, nodes_allowed); 2176944d9fecSLuiz Capitulino else 21776ae11b27SLee Schermerhorn ret = alloc_fresh_huge_page(h, nodes_allowed); 21787893d1d5SAdam Litke spin_lock(&hugetlb_lock); 21797893d1d5SAdam Litke if (!ret) 21807893d1d5SAdam Litke goto out; 21817893d1d5SAdam Litke 2182536240f2SMel Gorman /* Bail for signals. Probably ctrl-c from user */ 2183536240f2SMel Gorman if (signal_pending(current)) 2184536240f2SMel Gorman goto out; 21857893d1d5SAdam Litke } 21867893d1d5SAdam Litke 21877893d1d5SAdam Litke /* 21887893d1d5SAdam Litke * Decrease the pool size 21897893d1d5SAdam Litke * First return free pages to the buddy allocator (being careful 21907893d1d5SAdam Litke * to keep enough around to satisfy reservations). Then place 21917893d1d5SAdam Litke * pages into surplus state as needed so the pool will shrink 21927893d1d5SAdam Litke * to the desired size as pages become free. 2193d1c3fb1fSNishanth Aravamudan * 2194d1c3fb1fSNishanth Aravamudan * By placing pages into the surplus state independent of the 2195d1c3fb1fSNishanth Aravamudan * overcommit value, we are allowing the surplus pool size to 2196d1c3fb1fSNishanth Aravamudan * exceed overcommit. There are few sane options here. Since 2197d15c7c09SNaoya Horiguchi * __alloc_buddy_huge_page() is checking the global counter, 2198d1c3fb1fSNishanth Aravamudan * though, we'll note that we're not allowed to exceed surplus 2199d1c3fb1fSNishanth Aravamudan * and won't grow the pool anywhere else. Not until one of the 2200d1c3fb1fSNishanth Aravamudan * sysctls are changed, or the surplus pages go out of use. 22017893d1d5SAdam Litke */ 2202a5516438SAndi Kleen min_count = h->resv_huge_pages + h->nr_huge_pages - h->free_huge_pages; 22036b0c880dSAdam Litke min_count = max(count, min_count); 22046ae11b27SLee Schermerhorn try_to_free_low(h, min_count, nodes_allowed); 2205a5516438SAndi Kleen while (min_count < persistent_huge_pages(h)) { 22066ae11b27SLee Schermerhorn if (!free_pool_huge_page(h, nodes_allowed, 0)) 22071da177e4SLinus Torvalds break; 220855f67141SMizuma, Masayoshi cond_resched_lock(&hugetlb_lock); 22091da177e4SLinus Torvalds } 2210a5516438SAndi Kleen while (count < persistent_huge_pages(h)) { 22116ae11b27SLee Schermerhorn if (!adjust_pool_surplus(h, nodes_allowed, 1)) 22127893d1d5SAdam Litke break; 22137893d1d5SAdam Litke } 22147893d1d5SAdam Litke out: 2215a5516438SAndi Kleen ret = persistent_huge_pages(h); 22161da177e4SLinus Torvalds spin_unlock(&hugetlb_lock); 22177893d1d5SAdam Litke return ret; 22181da177e4SLinus Torvalds } 22191da177e4SLinus Torvalds 2220a3437870SNishanth Aravamudan #define HSTATE_ATTR_RO(_name) \ 2221a3437870SNishanth Aravamudan static struct kobj_attribute _name##_attr = __ATTR_RO(_name) 2222a3437870SNishanth Aravamudan 2223a3437870SNishanth Aravamudan #define HSTATE_ATTR(_name) \ 2224a3437870SNishanth Aravamudan static struct kobj_attribute _name##_attr = \ 2225a3437870SNishanth Aravamudan __ATTR(_name, 0644, _name##_show, _name##_store) 2226a3437870SNishanth Aravamudan 2227a3437870SNishanth Aravamudan static struct kobject *hugepages_kobj; 2228a3437870SNishanth Aravamudan static struct kobject *hstate_kobjs[HUGE_MAX_HSTATE]; 2229a3437870SNishanth Aravamudan 22309a305230SLee Schermerhorn static struct hstate *kobj_to_node_hstate(struct kobject *kobj, int *nidp); 22319a305230SLee Schermerhorn 22329a305230SLee Schermerhorn static struct hstate *kobj_to_hstate(struct kobject *kobj, int *nidp) 2233a3437870SNishanth Aravamudan { 2234a3437870SNishanth Aravamudan int i; 22359a305230SLee Schermerhorn 2236a3437870SNishanth Aravamudan for (i = 0; i < HUGE_MAX_HSTATE; i++) 22379a305230SLee Schermerhorn if (hstate_kobjs[i] == kobj) { 22389a305230SLee Schermerhorn if (nidp) 22399a305230SLee Schermerhorn *nidp = NUMA_NO_NODE; 2240a3437870SNishanth Aravamudan return &hstates[i]; 22419a305230SLee Schermerhorn } 22429a305230SLee Schermerhorn 22439a305230SLee Schermerhorn return kobj_to_node_hstate(kobj, nidp); 2244a3437870SNishanth Aravamudan } 2245a3437870SNishanth Aravamudan 224606808b08SLee Schermerhorn static ssize_t nr_hugepages_show_common(struct kobject *kobj, 2247a3437870SNishanth Aravamudan struct kobj_attribute *attr, char *buf) 2248a3437870SNishanth Aravamudan { 22499a305230SLee Schermerhorn struct hstate *h; 22509a305230SLee Schermerhorn unsigned long nr_huge_pages; 22519a305230SLee Schermerhorn int nid; 22529a305230SLee Schermerhorn 22539a305230SLee Schermerhorn h = kobj_to_hstate(kobj, &nid); 22549a305230SLee Schermerhorn if (nid == NUMA_NO_NODE) 22559a305230SLee Schermerhorn nr_huge_pages = h->nr_huge_pages; 22569a305230SLee Schermerhorn else 22579a305230SLee Schermerhorn nr_huge_pages = h->nr_huge_pages_node[nid]; 22589a305230SLee Schermerhorn 22599a305230SLee Schermerhorn return sprintf(buf, "%lu\n", nr_huge_pages); 2260a3437870SNishanth Aravamudan } 2261adbe8726SEric B Munson 2262238d3c13SDavid Rientjes static ssize_t __nr_hugepages_store_common(bool obey_mempolicy, 2263238d3c13SDavid Rientjes struct hstate *h, int nid, 2264238d3c13SDavid Rientjes unsigned long count, size_t len) 2265a3437870SNishanth Aravamudan { 2266a3437870SNishanth Aravamudan int err; 2267bad44b5bSDavid Rientjes NODEMASK_ALLOC(nodemask_t, nodes_allowed, GFP_KERNEL | __GFP_NORETRY); 2268a3437870SNishanth Aravamudan 2269944d9fecSLuiz Capitulino if (hstate_is_gigantic(h) && !gigantic_page_supported()) { 2270adbe8726SEric B Munson err = -EINVAL; 2271adbe8726SEric B Munson goto out; 2272adbe8726SEric B Munson } 2273adbe8726SEric B Munson 22749a305230SLee Schermerhorn if (nid == NUMA_NO_NODE) { 22759a305230SLee Schermerhorn /* 22769a305230SLee Schermerhorn * global hstate attribute 22779a305230SLee Schermerhorn */ 22789a305230SLee Schermerhorn if (!(obey_mempolicy && 22799a305230SLee Schermerhorn init_nodemask_of_mempolicy(nodes_allowed))) { 228006808b08SLee Schermerhorn NODEMASK_FREE(nodes_allowed); 22818cebfcd0SLai Jiangshan nodes_allowed = &node_states[N_MEMORY]; 228206808b08SLee Schermerhorn } 22839a305230SLee Schermerhorn } else if (nodes_allowed) { 22849a305230SLee Schermerhorn /* 22859a305230SLee Schermerhorn * per node hstate attribute: adjust count to global, 22869a305230SLee Schermerhorn * but restrict alloc/free to the specified node. 22879a305230SLee Schermerhorn */ 22889a305230SLee Schermerhorn count += h->nr_huge_pages - h->nr_huge_pages_node[nid]; 22899a305230SLee Schermerhorn init_nodemask_of_node(nodes_allowed, nid); 22909a305230SLee Schermerhorn } else 22918cebfcd0SLai Jiangshan nodes_allowed = &node_states[N_MEMORY]; 22929a305230SLee Schermerhorn 229306808b08SLee Schermerhorn h->max_huge_pages = set_max_huge_pages(h, count, nodes_allowed); 2294a3437870SNishanth Aravamudan 22958cebfcd0SLai Jiangshan if (nodes_allowed != &node_states[N_MEMORY]) 229606808b08SLee Schermerhorn NODEMASK_FREE(nodes_allowed); 229706808b08SLee Schermerhorn 229806808b08SLee Schermerhorn return len; 2299adbe8726SEric B Munson out: 2300adbe8726SEric B Munson NODEMASK_FREE(nodes_allowed); 2301adbe8726SEric B Munson return err; 230206808b08SLee Schermerhorn } 230306808b08SLee Schermerhorn 2304238d3c13SDavid Rientjes static ssize_t nr_hugepages_store_common(bool obey_mempolicy, 2305238d3c13SDavid Rientjes struct kobject *kobj, const char *buf, 2306238d3c13SDavid Rientjes size_t len) 2307238d3c13SDavid Rientjes { 2308238d3c13SDavid Rientjes struct hstate *h; 2309238d3c13SDavid Rientjes unsigned long count; 2310238d3c13SDavid Rientjes int nid; 2311238d3c13SDavid Rientjes int err; 2312238d3c13SDavid Rientjes 2313238d3c13SDavid Rientjes err = kstrtoul(buf, 10, &count); 2314238d3c13SDavid Rientjes if (err) 2315238d3c13SDavid Rientjes return err; 2316238d3c13SDavid Rientjes 2317238d3c13SDavid Rientjes h = kobj_to_hstate(kobj, &nid); 2318238d3c13SDavid Rientjes return __nr_hugepages_store_common(obey_mempolicy, h, nid, count, len); 2319238d3c13SDavid Rientjes } 2320238d3c13SDavid Rientjes 232106808b08SLee Schermerhorn static ssize_t nr_hugepages_show(struct kobject *kobj, 232206808b08SLee Schermerhorn struct kobj_attribute *attr, char *buf) 232306808b08SLee Schermerhorn { 232406808b08SLee Schermerhorn return nr_hugepages_show_common(kobj, attr, buf); 232506808b08SLee Schermerhorn } 232606808b08SLee Schermerhorn 232706808b08SLee Schermerhorn static ssize_t nr_hugepages_store(struct kobject *kobj, 232806808b08SLee Schermerhorn struct kobj_attribute *attr, const char *buf, size_t len) 232906808b08SLee Schermerhorn { 2330238d3c13SDavid Rientjes return nr_hugepages_store_common(false, kobj, buf, len); 2331a3437870SNishanth Aravamudan } 2332a3437870SNishanth Aravamudan HSTATE_ATTR(nr_hugepages); 2333a3437870SNishanth Aravamudan 233406808b08SLee Schermerhorn #ifdef CONFIG_NUMA 233506808b08SLee Schermerhorn 233606808b08SLee Schermerhorn /* 233706808b08SLee Schermerhorn * hstate attribute for optionally mempolicy-based constraint on persistent 233806808b08SLee Schermerhorn * huge page alloc/free. 233906808b08SLee Schermerhorn */ 234006808b08SLee Schermerhorn static ssize_t nr_hugepages_mempolicy_show(struct kobject *kobj, 234106808b08SLee Schermerhorn struct kobj_attribute *attr, char *buf) 234206808b08SLee Schermerhorn { 234306808b08SLee Schermerhorn return nr_hugepages_show_common(kobj, attr, buf); 234406808b08SLee Schermerhorn } 234506808b08SLee Schermerhorn 234606808b08SLee Schermerhorn static ssize_t nr_hugepages_mempolicy_store(struct kobject *kobj, 234706808b08SLee Schermerhorn struct kobj_attribute *attr, const char *buf, size_t len) 234806808b08SLee Schermerhorn { 2349238d3c13SDavid Rientjes return nr_hugepages_store_common(true, kobj, buf, len); 235006808b08SLee Schermerhorn } 235106808b08SLee Schermerhorn HSTATE_ATTR(nr_hugepages_mempolicy); 235206808b08SLee Schermerhorn #endif 235306808b08SLee Schermerhorn 235406808b08SLee Schermerhorn 2355a3437870SNishanth Aravamudan static ssize_t nr_overcommit_hugepages_show(struct kobject *kobj, 2356a3437870SNishanth Aravamudan struct kobj_attribute *attr, char *buf) 2357a3437870SNishanth Aravamudan { 23589a305230SLee Schermerhorn struct hstate *h = kobj_to_hstate(kobj, NULL); 2359a3437870SNishanth Aravamudan return sprintf(buf, "%lu\n", h->nr_overcommit_huge_pages); 2360a3437870SNishanth Aravamudan } 2361adbe8726SEric B Munson 2362a3437870SNishanth Aravamudan static ssize_t nr_overcommit_hugepages_store(struct kobject *kobj, 2363a3437870SNishanth Aravamudan struct kobj_attribute *attr, const char *buf, size_t count) 2364a3437870SNishanth Aravamudan { 2365a3437870SNishanth Aravamudan int err; 2366a3437870SNishanth Aravamudan unsigned long input; 23679a305230SLee Schermerhorn struct hstate *h = kobj_to_hstate(kobj, NULL); 2368a3437870SNishanth Aravamudan 2369bae7f4aeSLuiz Capitulino if (hstate_is_gigantic(h)) 2370adbe8726SEric B Munson return -EINVAL; 2371adbe8726SEric B Munson 23723dbb95f7SJingoo Han err = kstrtoul(buf, 10, &input); 2373a3437870SNishanth Aravamudan if (err) 237473ae31e5SEric B Munson return err; 2375a3437870SNishanth Aravamudan 2376a3437870SNishanth Aravamudan spin_lock(&hugetlb_lock); 2377a3437870SNishanth Aravamudan h->nr_overcommit_huge_pages = input; 2378a3437870SNishanth Aravamudan spin_unlock(&hugetlb_lock); 2379a3437870SNishanth Aravamudan 2380a3437870SNishanth Aravamudan return count; 2381a3437870SNishanth Aravamudan } 2382a3437870SNishanth Aravamudan HSTATE_ATTR(nr_overcommit_hugepages); 2383a3437870SNishanth Aravamudan 2384a3437870SNishanth Aravamudan static ssize_t free_hugepages_show(struct kobject *kobj, 2385a3437870SNishanth Aravamudan struct kobj_attribute *attr, char *buf) 2386a3437870SNishanth Aravamudan { 23879a305230SLee Schermerhorn struct hstate *h; 23889a305230SLee Schermerhorn unsigned long free_huge_pages; 23899a305230SLee Schermerhorn int nid; 23909a305230SLee Schermerhorn 23919a305230SLee Schermerhorn h = kobj_to_hstate(kobj, &nid); 23929a305230SLee Schermerhorn if (nid == NUMA_NO_NODE) 23939a305230SLee Schermerhorn free_huge_pages = h->free_huge_pages; 23949a305230SLee Schermerhorn else 23959a305230SLee Schermerhorn free_huge_pages = h->free_huge_pages_node[nid]; 23969a305230SLee Schermerhorn 23979a305230SLee Schermerhorn return sprintf(buf, "%lu\n", free_huge_pages); 2398a3437870SNishanth Aravamudan } 2399a3437870SNishanth Aravamudan HSTATE_ATTR_RO(free_hugepages); 2400a3437870SNishanth Aravamudan 2401a3437870SNishanth Aravamudan static ssize_t resv_hugepages_show(struct kobject *kobj, 2402a3437870SNishanth Aravamudan struct kobj_attribute *attr, char *buf) 2403a3437870SNishanth Aravamudan { 24049a305230SLee Schermerhorn struct hstate *h = kobj_to_hstate(kobj, NULL); 2405a3437870SNishanth Aravamudan return sprintf(buf, "%lu\n", h->resv_huge_pages); 2406a3437870SNishanth Aravamudan } 2407a3437870SNishanth Aravamudan HSTATE_ATTR_RO(resv_hugepages); 2408a3437870SNishanth Aravamudan 2409a3437870SNishanth Aravamudan static ssize_t surplus_hugepages_show(struct kobject *kobj, 2410a3437870SNishanth Aravamudan struct kobj_attribute *attr, char *buf) 2411a3437870SNishanth Aravamudan { 24129a305230SLee Schermerhorn struct hstate *h; 24139a305230SLee Schermerhorn unsigned long surplus_huge_pages; 24149a305230SLee Schermerhorn int nid; 24159a305230SLee Schermerhorn 24169a305230SLee Schermerhorn h = kobj_to_hstate(kobj, &nid); 24179a305230SLee Schermerhorn if (nid == NUMA_NO_NODE) 24189a305230SLee Schermerhorn surplus_huge_pages = h->surplus_huge_pages; 24199a305230SLee Schermerhorn else 24209a305230SLee Schermerhorn surplus_huge_pages = h->surplus_huge_pages_node[nid]; 24219a305230SLee Schermerhorn 24229a305230SLee Schermerhorn return sprintf(buf, "%lu\n", surplus_huge_pages); 2423a3437870SNishanth Aravamudan } 2424a3437870SNishanth Aravamudan HSTATE_ATTR_RO(surplus_hugepages); 2425a3437870SNishanth Aravamudan 2426a3437870SNishanth Aravamudan static struct attribute *hstate_attrs[] = { 2427a3437870SNishanth Aravamudan &nr_hugepages_attr.attr, 2428a3437870SNishanth Aravamudan &nr_overcommit_hugepages_attr.attr, 2429a3437870SNishanth Aravamudan &free_hugepages_attr.attr, 2430a3437870SNishanth Aravamudan &resv_hugepages_attr.attr, 2431a3437870SNishanth Aravamudan &surplus_hugepages_attr.attr, 243206808b08SLee Schermerhorn #ifdef CONFIG_NUMA 243306808b08SLee Schermerhorn &nr_hugepages_mempolicy_attr.attr, 243406808b08SLee Schermerhorn #endif 2435a3437870SNishanth Aravamudan NULL, 2436a3437870SNishanth Aravamudan }; 2437a3437870SNishanth Aravamudan 2438a3437870SNishanth Aravamudan static struct attribute_group hstate_attr_group = { 2439a3437870SNishanth Aravamudan .attrs = hstate_attrs, 2440a3437870SNishanth Aravamudan }; 2441a3437870SNishanth Aravamudan 2442094e9539SJeff Mahoney static int hugetlb_sysfs_add_hstate(struct hstate *h, struct kobject *parent, 24439a305230SLee Schermerhorn struct kobject **hstate_kobjs, 24449a305230SLee Schermerhorn struct attribute_group *hstate_attr_group) 2445a3437870SNishanth Aravamudan { 2446a3437870SNishanth Aravamudan int retval; 2447972dc4deSAneesh Kumar K.V int hi = hstate_index(h); 2448a3437870SNishanth Aravamudan 24499a305230SLee Schermerhorn hstate_kobjs[hi] = kobject_create_and_add(h->name, parent); 24509a305230SLee Schermerhorn if (!hstate_kobjs[hi]) 2451a3437870SNishanth Aravamudan return -ENOMEM; 2452a3437870SNishanth Aravamudan 24539a305230SLee Schermerhorn retval = sysfs_create_group(hstate_kobjs[hi], hstate_attr_group); 2454a3437870SNishanth Aravamudan if (retval) 24559a305230SLee Schermerhorn kobject_put(hstate_kobjs[hi]); 2456a3437870SNishanth Aravamudan 2457a3437870SNishanth Aravamudan return retval; 2458a3437870SNishanth Aravamudan } 2459a3437870SNishanth Aravamudan 2460a3437870SNishanth Aravamudan static void __init hugetlb_sysfs_init(void) 2461a3437870SNishanth Aravamudan { 2462a3437870SNishanth Aravamudan struct hstate *h; 2463a3437870SNishanth Aravamudan int err; 2464a3437870SNishanth Aravamudan 2465a3437870SNishanth Aravamudan hugepages_kobj = kobject_create_and_add("hugepages", mm_kobj); 2466a3437870SNishanth Aravamudan if (!hugepages_kobj) 2467a3437870SNishanth Aravamudan return; 2468a3437870SNishanth Aravamudan 2469a3437870SNishanth Aravamudan for_each_hstate(h) { 24709a305230SLee Schermerhorn err = hugetlb_sysfs_add_hstate(h, hugepages_kobj, 24719a305230SLee Schermerhorn hstate_kobjs, &hstate_attr_group); 2472a3437870SNishanth Aravamudan if (err) 2473ffb22af5SAndrew Morton pr_err("Hugetlb: Unable to add hstate %s", h->name); 2474a3437870SNishanth Aravamudan } 2475a3437870SNishanth Aravamudan } 2476a3437870SNishanth Aravamudan 24779a305230SLee Schermerhorn #ifdef CONFIG_NUMA 24789a305230SLee Schermerhorn 24799a305230SLee Schermerhorn /* 24809a305230SLee Schermerhorn * node_hstate/s - associate per node hstate attributes, via their kobjects, 248110fbcf4cSKay Sievers * with node devices in node_devices[] using a parallel array. The array 248210fbcf4cSKay Sievers * index of a node device or _hstate == node id. 248310fbcf4cSKay Sievers * This is here to avoid any static dependency of the node device driver, in 24849a305230SLee Schermerhorn * the base kernel, on the hugetlb module. 24859a305230SLee Schermerhorn */ 24869a305230SLee Schermerhorn struct node_hstate { 24879a305230SLee Schermerhorn struct kobject *hugepages_kobj; 24889a305230SLee Schermerhorn struct kobject *hstate_kobjs[HUGE_MAX_HSTATE]; 24899a305230SLee Schermerhorn }; 2490b4e289a6SAlexander Kuleshov static struct node_hstate node_hstates[MAX_NUMNODES]; 24919a305230SLee Schermerhorn 24929a305230SLee Schermerhorn /* 249310fbcf4cSKay Sievers * A subset of global hstate attributes for node devices 24949a305230SLee Schermerhorn */ 24959a305230SLee Schermerhorn static struct attribute *per_node_hstate_attrs[] = { 24969a305230SLee Schermerhorn &nr_hugepages_attr.attr, 24979a305230SLee Schermerhorn &free_hugepages_attr.attr, 24989a305230SLee Schermerhorn &surplus_hugepages_attr.attr, 24999a305230SLee Schermerhorn NULL, 25009a305230SLee Schermerhorn }; 25019a305230SLee Schermerhorn 25029a305230SLee Schermerhorn static struct attribute_group per_node_hstate_attr_group = { 25039a305230SLee Schermerhorn .attrs = per_node_hstate_attrs, 25049a305230SLee Schermerhorn }; 25059a305230SLee Schermerhorn 25069a305230SLee Schermerhorn /* 250710fbcf4cSKay Sievers * kobj_to_node_hstate - lookup global hstate for node device hstate attr kobj. 25089a305230SLee Schermerhorn * Returns node id via non-NULL nidp. 25099a305230SLee Schermerhorn */ 25109a305230SLee Schermerhorn static struct hstate *kobj_to_node_hstate(struct kobject *kobj, int *nidp) 25119a305230SLee Schermerhorn { 25129a305230SLee Schermerhorn int nid; 25139a305230SLee Schermerhorn 25149a305230SLee Schermerhorn for (nid = 0; nid < nr_node_ids; nid++) { 25159a305230SLee Schermerhorn struct node_hstate *nhs = &node_hstates[nid]; 25169a305230SLee Schermerhorn int i; 25179a305230SLee Schermerhorn for (i = 0; i < HUGE_MAX_HSTATE; i++) 25189a305230SLee Schermerhorn if (nhs->hstate_kobjs[i] == kobj) { 25199a305230SLee Schermerhorn if (nidp) 25209a305230SLee Schermerhorn *nidp = nid; 25219a305230SLee Schermerhorn return &hstates[i]; 25229a305230SLee Schermerhorn } 25239a305230SLee Schermerhorn } 25249a305230SLee Schermerhorn 25259a305230SLee Schermerhorn BUG(); 25269a305230SLee Schermerhorn return NULL; 25279a305230SLee Schermerhorn } 25289a305230SLee Schermerhorn 25299a305230SLee Schermerhorn /* 253010fbcf4cSKay Sievers * Unregister hstate attributes from a single node device. 25319a305230SLee Schermerhorn * No-op if no hstate attributes attached. 25329a305230SLee Schermerhorn */ 25333cd8b44fSClaudiu Ghioc static void hugetlb_unregister_node(struct node *node) 25349a305230SLee Schermerhorn { 25359a305230SLee Schermerhorn struct hstate *h; 253610fbcf4cSKay Sievers struct node_hstate *nhs = &node_hstates[node->dev.id]; 25379a305230SLee Schermerhorn 25389a305230SLee Schermerhorn if (!nhs->hugepages_kobj) 25399b5e5d0fSLee Schermerhorn return; /* no hstate attributes */ 25409a305230SLee Schermerhorn 2541972dc4deSAneesh Kumar K.V for_each_hstate(h) { 2542972dc4deSAneesh Kumar K.V int idx = hstate_index(h); 2543972dc4deSAneesh Kumar K.V if (nhs->hstate_kobjs[idx]) { 2544972dc4deSAneesh Kumar K.V kobject_put(nhs->hstate_kobjs[idx]); 2545972dc4deSAneesh Kumar K.V nhs->hstate_kobjs[idx] = NULL; 2546972dc4deSAneesh Kumar K.V } 25479a305230SLee Schermerhorn } 25489a305230SLee Schermerhorn 25499a305230SLee Schermerhorn kobject_put(nhs->hugepages_kobj); 25509a305230SLee Schermerhorn nhs->hugepages_kobj = NULL; 25519a305230SLee Schermerhorn } 25529a305230SLee Schermerhorn 25539a305230SLee Schermerhorn 25549a305230SLee Schermerhorn /* 255510fbcf4cSKay Sievers * Register hstate attributes for a single node device. 25569a305230SLee Schermerhorn * No-op if attributes already registered. 25579a305230SLee Schermerhorn */ 25583cd8b44fSClaudiu Ghioc static void hugetlb_register_node(struct node *node) 25599a305230SLee Schermerhorn { 25609a305230SLee Schermerhorn struct hstate *h; 256110fbcf4cSKay Sievers struct node_hstate *nhs = &node_hstates[node->dev.id]; 25629a305230SLee Schermerhorn int err; 25639a305230SLee Schermerhorn 25649a305230SLee Schermerhorn if (nhs->hugepages_kobj) 25659a305230SLee Schermerhorn return; /* already allocated */ 25669a305230SLee Schermerhorn 25679a305230SLee Schermerhorn nhs->hugepages_kobj = kobject_create_and_add("hugepages", 256810fbcf4cSKay Sievers &node->dev.kobj); 25699a305230SLee Schermerhorn if (!nhs->hugepages_kobj) 25709a305230SLee Schermerhorn return; 25719a305230SLee Schermerhorn 25729a305230SLee Schermerhorn for_each_hstate(h) { 25739a305230SLee Schermerhorn err = hugetlb_sysfs_add_hstate(h, nhs->hugepages_kobj, 25749a305230SLee Schermerhorn nhs->hstate_kobjs, 25759a305230SLee Schermerhorn &per_node_hstate_attr_group); 25769a305230SLee Schermerhorn if (err) { 2577ffb22af5SAndrew Morton pr_err("Hugetlb: Unable to add hstate %s for node %d\n", 257810fbcf4cSKay Sievers h->name, node->dev.id); 25799a305230SLee Schermerhorn hugetlb_unregister_node(node); 25809a305230SLee Schermerhorn break; 25819a305230SLee Schermerhorn } 25829a305230SLee Schermerhorn } 25839a305230SLee Schermerhorn } 25849a305230SLee Schermerhorn 25859a305230SLee Schermerhorn /* 25869b5e5d0fSLee Schermerhorn * hugetlb init time: register hstate attributes for all registered node 258710fbcf4cSKay Sievers * devices of nodes that have memory. All on-line nodes should have 258810fbcf4cSKay Sievers * registered their associated device by this time. 25899a305230SLee Schermerhorn */ 25907d9ca000SLuiz Capitulino static void __init hugetlb_register_all_nodes(void) 25919a305230SLee Schermerhorn { 25929a305230SLee Schermerhorn int nid; 25939a305230SLee Schermerhorn 25948cebfcd0SLai Jiangshan for_each_node_state(nid, N_MEMORY) { 25958732794bSWen Congyang struct node *node = node_devices[nid]; 259610fbcf4cSKay Sievers if (node->dev.id == nid) 25979a305230SLee Schermerhorn hugetlb_register_node(node); 25989a305230SLee Schermerhorn } 25999a305230SLee Schermerhorn 26009a305230SLee Schermerhorn /* 260110fbcf4cSKay Sievers * Let the node device driver know we're here so it can 26029a305230SLee Schermerhorn * [un]register hstate attributes on node hotplug. 26039a305230SLee Schermerhorn */ 26049a305230SLee Schermerhorn register_hugetlbfs_with_node(hugetlb_register_node, 26059a305230SLee Schermerhorn hugetlb_unregister_node); 26069a305230SLee Schermerhorn } 26079a305230SLee Schermerhorn #else /* !CONFIG_NUMA */ 26089a305230SLee Schermerhorn 26099a305230SLee Schermerhorn static struct hstate *kobj_to_node_hstate(struct kobject *kobj, int *nidp) 26109a305230SLee Schermerhorn { 26119a305230SLee Schermerhorn BUG(); 26129a305230SLee Schermerhorn if (nidp) 26139a305230SLee Schermerhorn *nidp = -1; 26149a305230SLee Schermerhorn return NULL; 26159a305230SLee Schermerhorn } 26169a305230SLee Schermerhorn 26179a305230SLee Schermerhorn static void hugetlb_register_all_nodes(void) { } 26189a305230SLee Schermerhorn 26199a305230SLee Schermerhorn #endif 26209a305230SLee Schermerhorn 2621a3437870SNishanth Aravamudan static int __init hugetlb_init(void) 2622a3437870SNishanth Aravamudan { 26238382d914SDavidlohr Bueso int i; 26248382d914SDavidlohr Bueso 2625457c1b27SNishanth Aravamudan if (!hugepages_supported()) 26260ef89d25SBenjamin Herrenschmidt return 0; 2627a3437870SNishanth Aravamudan 2628e11bfbfcSNick Piggin if (!size_to_hstate(default_hstate_size)) { 2629e11bfbfcSNick Piggin default_hstate_size = HPAGE_SIZE; 2630e11bfbfcSNick Piggin if (!size_to_hstate(default_hstate_size)) 2631a3437870SNishanth Aravamudan hugetlb_add_hstate(HUGETLB_PAGE_ORDER); 2632a3437870SNishanth Aravamudan } 2633972dc4deSAneesh Kumar K.V default_hstate_idx = hstate_index(size_to_hstate(default_hstate_size)); 2634f8b74815SVaishali Thakkar if (default_hstate_max_huge_pages) { 2635f8b74815SVaishali Thakkar if (!default_hstate.max_huge_pages) 2636e11bfbfcSNick Piggin default_hstate.max_huge_pages = default_hstate_max_huge_pages; 2637f8b74815SVaishali Thakkar } 2638a3437870SNishanth Aravamudan 2639a3437870SNishanth Aravamudan hugetlb_init_hstates(); 2640aa888a74SAndi Kleen gather_bootmem_prealloc(); 2641a3437870SNishanth Aravamudan report_hugepages(); 2642a3437870SNishanth Aravamudan 2643a3437870SNishanth Aravamudan hugetlb_sysfs_init(); 26449a305230SLee Schermerhorn hugetlb_register_all_nodes(); 26457179e7bfSJianguo Wu hugetlb_cgroup_file_init(); 26469a305230SLee Schermerhorn 26478382d914SDavidlohr Bueso #ifdef CONFIG_SMP 26488382d914SDavidlohr Bueso num_fault_mutexes = roundup_pow_of_two(8 * num_possible_cpus()); 26498382d914SDavidlohr Bueso #else 26508382d914SDavidlohr Bueso num_fault_mutexes = 1; 26518382d914SDavidlohr Bueso #endif 2652c672c7f2SMike Kravetz hugetlb_fault_mutex_table = 26538382d914SDavidlohr Bueso kmalloc(sizeof(struct mutex) * num_fault_mutexes, GFP_KERNEL); 2654c672c7f2SMike Kravetz BUG_ON(!hugetlb_fault_mutex_table); 26558382d914SDavidlohr Bueso 26568382d914SDavidlohr Bueso for (i = 0; i < num_fault_mutexes; i++) 2657c672c7f2SMike Kravetz mutex_init(&hugetlb_fault_mutex_table[i]); 2658a3437870SNishanth Aravamudan return 0; 2659a3437870SNishanth Aravamudan } 26603e89e1c5SPaul Gortmaker subsys_initcall(hugetlb_init); 2661a3437870SNishanth Aravamudan 2662a3437870SNishanth Aravamudan /* Should be called on processing a hugepagesz=... option */ 26639fee021dSVaishali Thakkar void __init hugetlb_bad_size(void) 26649fee021dSVaishali Thakkar { 26659fee021dSVaishali Thakkar parsed_valid_hugepagesz = false; 26669fee021dSVaishali Thakkar } 26679fee021dSVaishali Thakkar 2668d00181b9SKirill A. Shutemov void __init hugetlb_add_hstate(unsigned int order) 2669a3437870SNishanth Aravamudan { 2670a3437870SNishanth Aravamudan struct hstate *h; 26718faa8b07SAndi Kleen unsigned long i; 26728faa8b07SAndi Kleen 2673a3437870SNishanth Aravamudan if (size_to_hstate(PAGE_SIZE << order)) { 2674598d8091SJoe Perches pr_warn("hugepagesz= specified twice, ignoring\n"); 2675a3437870SNishanth Aravamudan return; 2676a3437870SNishanth Aravamudan } 267747d38344SAneesh Kumar K.V BUG_ON(hugetlb_max_hstate >= HUGE_MAX_HSTATE); 2678a3437870SNishanth Aravamudan BUG_ON(order == 0); 267947d38344SAneesh Kumar K.V h = &hstates[hugetlb_max_hstate++]; 2680a3437870SNishanth Aravamudan h->order = order; 2681a3437870SNishanth Aravamudan h->mask = ~((1ULL << (order + PAGE_SHIFT)) - 1); 26828faa8b07SAndi Kleen h->nr_huge_pages = 0; 26838faa8b07SAndi Kleen h->free_huge_pages = 0; 26848faa8b07SAndi Kleen for (i = 0; i < MAX_NUMNODES; ++i) 26858faa8b07SAndi Kleen INIT_LIST_HEAD(&h->hugepage_freelists[i]); 26860edaecfaSAneesh Kumar K.V INIT_LIST_HEAD(&h->hugepage_activelist); 26878cebfcd0SLai Jiangshan h->next_nid_to_alloc = first_node(node_states[N_MEMORY]); 26888cebfcd0SLai Jiangshan h->next_nid_to_free = first_node(node_states[N_MEMORY]); 2689a3437870SNishanth Aravamudan snprintf(h->name, HSTATE_NAME_LEN, "hugepages-%lukB", 2690a3437870SNishanth Aravamudan huge_page_size(h)/1024); 26918faa8b07SAndi Kleen 2692a3437870SNishanth Aravamudan parsed_hstate = h; 2693a3437870SNishanth Aravamudan } 2694a3437870SNishanth Aravamudan 2695e11bfbfcSNick Piggin static int __init hugetlb_nrpages_setup(char *s) 2696a3437870SNishanth Aravamudan { 2697a3437870SNishanth Aravamudan unsigned long *mhp; 26988faa8b07SAndi Kleen static unsigned long *last_mhp; 2699a3437870SNishanth Aravamudan 27009fee021dSVaishali Thakkar if (!parsed_valid_hugepagesz) { 27019fee021dSVaishali Thakkar pr_warn("hugepages = %s preceded by " 27029fee021dSVaishali Thakkar "an unsupported hugepagesz, ignoring\n", s); 27039fee021dSVaishali Thakkar parsed_valid_hugepagesz = true; 27049fee021dSVaishali Thakkar return 1; 27059fee021dSVaishali Thakkar } 2706a3437870SNishanth Aravamudan /* 270747d38344SAneesh Kumar K.V * !hugetlb_max_hstate means we haven't parsed a hugepagesz= parameter yet, 2708a3437870SNishanth Aravamudan * so this hugepages= parameter goes to the "default hstate". 2709a3437870SNishanth Aravamudan */ 27109fee021dSVaishali Thakkar else if (!hugetlb_max_hstate) 2711a3437870SNishanth Aravamudan mhp = &default_hstate_max_huge_pages; 2712a3437870SNishanth Aravamudan else 2713a3437870SNishanth Aravamudan mhp = &parsed_hstate->max_huge_pages; 2714a3437870SNishanth Aravamudan 27158faa8b07SAndi Kleen if (mhp == last_mhp) { 2716598d8091SJoe Perches pr_warn("hugepages= specified twice without interleaving hugepagesz=, ignoring\n"); 27178faa8b07SAndi Kleen return 1; 27188faa8b07SAndi Kleen } 27198faa8b07SAndi Kleen 2720a3437870SNishanth Aravamudan if (sscanf(s, "%lu", mhp) <= 0) 2721a3437870SNishanth Aravamudan *mhp = 0; 2722a3437870SNishanth Aravamudan 27238faa8b07SAndi Kleen /* 27248faa8b07SAndi Kleen * Global state is always initialized later in hugetlb_init. 27258faa8b07SAndi Kleen * But we need to allocate >= MAX_ORDER hstates here early to still 27268faa8b07SAndi Kleen * use the bootmem allocator. 27278faa8b07SAndi Kleen */ 272847d38344SAneesh Kumar K.V if (hugetlb_max_hstate && parsed_hstate->order >= MAX_ORDER) 27298faa8b07SAndi Kleen hugetlb_hstate_alloc_pages(parsed_hstate); 27308faa8b07SAndi Kleen 27318faa8b07SAndi Kleen last_mhp = mhp; 27328faa8b07SAndi Kleen 2733a3437870SNishanth Aravamudan return 1; 2734a3437870SNishanth Aravamudan } 2735e11bfbfcSNick Piggin __setup("hugepages=", hugetlb_nrpages_setup); 2736e11bfbfcSNick Piggin 2737e11bfbfcSNick Piggin static int __init hugetlb_default_setup(char *s) 2738e11bfbfcSNick Piggin { 2739e11bfbfcSNick Piggin default_hstate_size = memparse(s, &s); 2740e11bfbfcSNick Piggin return 1; 2741e11bfbfcSNick Piggin } 2742e11bfbfcSNick Piggin __setup("default_hugepagesz=", hugetlb_default_setup); 2743a3437870SNishanth Aravamudan 27448a213460SNishanth Aravamudan static unsigned int cpuset_mems_nr(unsigned int *array) 27458a213460SNishanth Aravamudan { 27468a213460SNishanth Aravamudan int node; 27478a213460SNishanth Aravamudan unsigned int nr = 0; 27488a213460SNishanth Aravamudan 27498a213460SNishanth Aravamudan for_each_node_mask(node, cpuset_current_mems_allowed) 27508a213460SNishanth Aravamudan nr += array[node]; 27518a213460SNishanth Aravamudan 27528a213460SNishanth Aravamudan return nr; 27538a213460SNishanth Aravamudan } 27548a213460SNishanth Aravamudan 27558a213460SNishanth Aravamudan #ifdef CONFIG_SYSCTL 275606808b08SLee Schermerhorn static int hugetlb_sysctl_handler_common(bool obey_mempolicy, 275706808b08SLee Schermerhorn struct ctl_table *table, int write, 275806808b08SLee Schermerhorn void __user *buffer, size_t *length, loff_t *ppos) 27591da177e4SLinus Torvalds { 2760e5ff2159SAndi Kleen struct hstate *h = &default_hstate; 2761238d3c13SDavid Rientjes unsigned long tmp = h->max_huge_pages; 276208d4a246SMichal Hocko int ret; 2763e5ff2159SAndi Kleen 2764457c1b27SNishanth Aravamudan if (!hugepages_supported()) 276586613628SJan Stancek return -EOPNOTSUPP; 2766457c1b27SNishanth Aravamudan 2767e5ff2159SAndi Kleen table->data = &tmp; 2768e5ff2159SAndi Kleen table->maxlen = sizeof(unsigned long); 276908d4a246SMichal Hocko ret = proc_doulongvec_minmax(table, write, buffer, length, ppos); 277008d4a246SMichal Hocko if (ret) 277108d4a246SMichal Hocko goto out; 2772e5ff2159SAndi Kleen 2773238d3c13SDavid Rientjes if (write) 2774238d3c13SDavid Rientjes ret = __nr_hugepages_store_common(obey_mempolicy, h, 2775238d3c13SDavid Rientjes NUMA_NO_NODE, tmp, *length); 277608d4a246SMichal Hocko out: 277708d4a246SMichal Hocko return ret; 27781da177e4SLinus Torvalds } 2779396faf03SMel Gorman 278006808b08SLee Schermerhorn int hugetlb_sysctl_handler(struct ctl_table *table, int write, 278106808b08SLee Schermerhorn void __user *buffer, size_t *length, loff_t *ppos) 278206808b08SLee Schermerhorn { 278306808b08SLee Schermerhorn 278406808b08SLee Schermerhorn return hugetlb_sysctl_handler_common(false, table, write, 278506808b08SLee Schermerhorn buffer, length, ppos); 278606808b08SLee Schermerhorn } 278706808b08SLee Schermerhorn 278806808b08SLee Schermerhorn #ifdef CONFIG_NUMA 278906808b08SLee Schermerhorn int hugetlb_mempolicy_sysctl_handler(struct ctl_table *table, int write, 279006808b08SLee Schermerhorn void __user *buffer, size_t *length, loff_t *ppos) 279106808b08SLee Schermerhorn { 279206808b08SLee Schermerhorn return hugetlb_sysctl_handler_common(true, table, write, 279306808b08SLee Schermerhorn buffer, length, ppos); 279406808b08SLee Schermerhorn } 279506808b08SLee Schermerhorn #endif /* CONFIG_NUMA */ 279606808b08SLee Schermerhorn 2797a3d0c6aaSNishanth Aravamudan int hugetlb_overcommit_handler(struct ctl_table *table, int write, 27988d65af78SAlexey Dobriyan void __user *buffer, 2799a3d0c6aaSNishanth Aravamudan size_t *length, loff_t *ppos) 2800a3d0c6aaSNishanth Aravamudan { 2801a5516438SAndi Kleen struct hstate *h = &default_hstate; 2802e5ff2159SAndi Kleen unsigned long tmp; 280308d4a246SMichal Hocko int ret; 2804e5ff2159SAndi Kleen 2805457c1b27SNishanth Aravamudan if (!hugepages_supported()) 280686613628SJan Stancek return -EOPNOTSUPP; 2807457c1b27SNishanth Aravamudan 2808e5ff2159SAndi Kleen tmp = h->nr_overcommit_huge_pages; 2809e5ff2159SAndi Kleen 2810bae7f4aeSLuiz Capitulino if (write && hstate_is_gigantic(h)) 2811adbe8726SEric B Munson return -EINVAL; 2812adbe8726SEric B Munson 2813e5ff2159SAndi Kleen table->data = &tmp; 2814e5ff2159SAndi Kleen table->maxlen = sizeof(unsigned long); 281508d4a246SMichal Hocko ret = proc_doulongvec_minmax(table, write, buffer, length, ppos); 281608d4a246SMichal Hocko if (ret) 281708d4a246SMichal Hocko goto out; 2818e5ff2159SAndi Kleen 2819e5ff2159SAndi Kleen if (write) { 2820064d9efeSNishanth Aravamudan spin_lock(&hugetlb_lock); 2821e5ff2159SAndi Kleen h->nr_overcommit_huge_pages = tmp; 2822a3d0c6aaSNishanth Aravamudan spin_unlock(&hugetlb_lock); 2823e5ff2159SAndi Kleen } 282408d4a246SMichal Hocko out: 282508d4a246SMichal Hocko return ret; 2826a3d0c6aaSNishanth Aravamudan } 2827a3d0c6aaSNishanth Aravamudan 28281da177e4SLinus Torvalds #endif /* CONFIG_SYSCTL */ 28291da177e4SLinus Torvalds 2830e1759c21SAlexey Dobriyan void hugetlb_report_meminfo(struct seq_file *m) 28311da177e4SLinus Torvalds { 2832a5516438SAndi Kleen struct hstate *h = &default_hstate; 2833457c1b27SNishanth Aravamudan if (!hugepages_supported()) 2834457c1b27SNishanth Aravamudan return; 2835e1759c21SAlexey Dobriyan seq_printf(m, 28361da177e4SLinus Torvalds "HugePages_Total: %5lu\n" 28371da177e4SLinus Torvalds "HugePages_Free: %5lu\n" 2838b45b5bd6SDavid Gibson "HugePages_Rsvd: %5lu\n" 28397893d1d5SAdam Litke "HugePages_Surp: %5lu\n" 28404f98a2feSRik van Riel "Hugepagesize: %8lu kB\n", 2841a5516438SAndi Kleen h->nr_huge_pages, 2842a5516438SAndi Kleen h->free_huge_pages, 2843a5516438SAndi Kleen h->resv_huge_pages, 2844a5516438SAndi Kleen h->surplus_huge_pages, 2845a5516438SAndi Kleen 1UL << (huge_page_order(h) + PAGE_SHIFT - 10)); 28461da177e4SLinus Torvalds } 28471da177e4SLinus Torvalds 28481da177e4SLinus Torvalds int hugetlb_report_node_meminfo(int nid, char *buf) 28491da177e4SLinus Torvalds { 2850a5516438SAndi Kleen struct hstate *h = &default_hstate; 2851457c1b27SNishanth Aravamudan if (!hugepages_supported()) 2852457c1b27SNishanth Aravamudan return 0; 28531da177e4SLinus Torvalds return sprintf(buf, 28541da177e4SLinus Torvalds "Node %d HugePages_Total: %5u\n" 2855a1de0919SNishanth Aravamudan "Node %d HugePages_Free: %5u\n" 2856a1de0919SNishanth Aravamudan "Node %d HugePages_Surp: %5u\n", 2857a5516438SAndi Kleen nid, h->nr_huge_pages_node[nid], 2858a5516438SAndi Kleen nid, h->free_huge_pages_node[nid], 2859a5516438SAndi Kleen nid, h->surplus_huge_pages_node[nid]); 28601da177e4SLinus Torvalds } 28611da177e4SLinus Torvalds 2862949f7ec5SDavid Rientjes void hugetlb_show_meminfo(void) 2863949f7ec5SDavid Rientjes { 2864949f7ec5SDavid Rientjes struct hstate *h; 2865949f7ec5SDavid Rientjes int nid; 2866949f7ec5SDavid Rientjes 2867457c1b27SNishanth Aravamudan if (!hugepages_supported()) 2868457c1b27SNishanth Aravamudan return; 2869457c1b27SNishanth Aravamudan 2870949f7ec5SDavid Rientjes for_each_node_state(nid, N_MEMORY) 2871949f7ec5SDavid Rientjes for_each_hstate(h) 2872949f7ec5SDavid Rientjes pr_info("Node %d hugepages_total=%u hugepages_free=%u hugepages_surp=%u hugepages_size=%lukB\n", 2873949f7ec5SDavid Rientjes nid, 2874949f7ec5SDavid Rientjes h->nr_huge_pages_node[nid], 2875949f7ec5SDavid Rientjes h->free_huge_pages_node[nid], 2876949f7ec5SDavid Rientjes h->surplus_huge_pages_node[nid], 2877949f7ec5SDavid Rientjes 1UL << (huge_page_order(h) + PAGE_SHIFT - 10)); 2878949f7ec5SDavid Rientjes } 2879949f7ec5SDavid Rientjes 28805d317b2bSNaoya Horiguchi void hugetlb_report_usage(struct seq_file *m, struct mm_struct *mm) 28815d317b2bSNaoya Horiguchi { 28825d317b2bSNaoya Horiguchi seq_printf(m, "HugetlbPages:\t%8lu kB\n", 28835d317b2bSNaoya Horiguchi atomic_long_read(&mm->hugetlb_usage) << (PAGE_SHIFT - 10)); 28845d317b2bSNaoya Horiguchi } 28855d317b2bSNaoya Horiguchi 28861da177e4SLinus Torvalds /* Return the number pages of memory we physically have, in PAGE_SIZE units. */ 28871da177e4SLinus Torvalds unsigned long hugetlb_total_pages(void) 28881da177e4SLinus Torvalds { 2889d0028588SWanpeng Li struct hstate *h; 2890d0028588SWanpeng Li unsigned long nr_total_pages = 0; 2891d0028588SWanpeng Li 2892d0028588SWanpeng Li for_each_hstate(h) 2893d0028588SWanpeng Li nr_total_pages += h->nr_huge_pages * pages_per_huge_page(h); 2894d0028588SWanpeng Li return nr_total_pages; 28951da177e4SLinus Torvalds } 28961da177e4SLinus Torvalds 2897a5516438SAndi Kleen static int hugetlb_acct_memory(struct hstate *h, long delta) 2898fc1b8a73SMel Gorman { 2899fc1b8a73SMel Gorman int ret = -ENOMEM; 2900fc1b8a73SMel Gorman 2901fc1b8a73SMel Gorman spin_lock(&hugetlb_lock); 2902fc1b8a73SMel Gorman /* 2903fc1b8a73SMel Gorman * When cpuset is configured, it breaks the strict hugetlb page 2904fc1b8a73SMel Gorman * reservation as the accounting is done on a global variable. Such 2905fc1b8a73SMel Gorman * reservation is completely rubbish in the presence of cpuset because 2906fc1b8a73SMel Gorman * the reservation is not checked against page availability for the 2907fc1b8a73SMel Gorman * current cpuset. Application can still potentially OOM'ed by kernel 2908fc1b8a73SMel Gorman * with lack of free htlb page in cpuset that the task is in. 2909fc1b8a73SMel Gorman * Attempt to enforce strict accounting with cpuset is almost 2910fc1b8a73SMel Gorman * impossible (or too ugly) because cpuset is too fluid that 2911fc1b8a73SMel Gorman * task or memory node can be dynamically moved between cpusets. 2912fc1b8a73SMel Gorman * 2913fc1b8a73SMel Gorman * The change of semantics for shared hugetlb mapping with cpuset is 2914fc1b8a73SMel Gorman * undesirable. However, in order to preserve some of the semantics, 2915fc1b8a73SMel Gorman * we fall back to check against current free page availability as 2916fc1b8a73SMel Gorman * a best attempt and hopefully to minimize the impact of changing 2917fc1b8a73SMel Gorman * semantics that cpuset has. 2918fc1b8a73SMel Gorman */ 2919fc1b8a73SMel Gorman if (delta > 0) { 2920a5516438SAndi Kleen if (gather_surplus_pages(h, delta) < 0) 2921fc1b8a73SMel Gorman goto out; 2922fc1b8a73SMel Gorman 2923a5516438SAndi Kleen if (delta > cpuset_mems_nr(h->free_huge_pages_node)) { 2924a5516438SAndi Kleen return_unused_surplus_pages(h, delta); 2925fc1b8a73SMel Gorman goto out; 2926fc1b8a73SMel Gorman } 2927fc1b8a73SMel Gorman } 2928fc1b8a73SMel Gorman 2929fc1b8a73SMel Gorman ret = 0; 2930fc1b8a73SMel Gorman if (delta < 0) 2931a5516438SAndi Kleen return_unused_surplus_pages(h, (unsigned long) -delta); 2932fc1b8a73SMel Gorman 2933fc1b8a73SMel Gorman out: 2934fc1b8a73SMel Gorman spin_unlock(&hugetlb_lock); 2935fc1b8a73SMel Gorman return ret; 2936fc1b8a73SMel Gorman } 2937fc1b8a73SMel Gorman 293884afd99bSAndy Whitcroft static void hugetlb_vm_op_open(struct vm_area_struct *vma) 293984afd99bSAndy Whitcroft { 2940f522c3acSJoonsoo Kim struct resv_map *resv = vma_resv_map(vma); 294184afd99bSAndy Whitcroft 294284afd99bSAndy Whitcroft /* 294384afd99bSAndy Whitcroft * This new VMA should share its siblings reservation map if present. 294484afd99bSAndy Whitcroft * The VMA will only ever have a valid reservation map pointer where 294584afd99bSAndy Whitcroft * it is being copied for another still existing VMA. As that VMA 294625985edcSLucas De Marchi * has a reference to the reservation map it cannot disappear until 294784afd99bSAndy Whitcroft * after this open call completes. It is therefore safe to take a 294884afd99bSAndy Whitcroft * new reference here without additional locking. 294984afd99bSAndy Whitcroft */ 29504e35f483SJoonsoo Kim if (resv && is_vma_resv_set(vma, HPAGE_RESV_OWNER)) 2951f522c3acSJoonsoo Kim kref_get(&resv->refs); 295284afd99bSAndy Whitcroft } 295384afd99bSAndy Whitcroft 2954a1e78772SMel Gorman static void hugetlb_vm_op_close(struct vm_area_struct *vma) 2955a1e78772SMel Gorman { 2956a5516438SAndi Kleen struct hstate *h = hstate_vma(vma); 2957f522c3acSJoonsoo Kim struct resv_map *resv = vma_resv_map(vma); 295890481622SDavid Gibson struct hugepage_subpool *spool = subpool_vma(vma); 29594e35f483SJoonsoo Kim unsigned long reserve, start, end; 29601c5ecae3SMike Kravetz long gbl_reserve; 296184afd99bSAndy Whitcroft 29624e35f483SJoonsoo Kim if (!resv || !is_vma_resv_set(vma, HPAGE_RESV_OWNER)) 29634e35f483SJoonsoo Kim return; 29644e35f483SJoonsoo Kim 2965a5516438SAndi Kleen start = vma_hugecache_offset(h, vma, vma->vm_start); 2966a5516438SAndi Kleen end = vma_hugecache_offset(h, vma, vma->vm_end); 296784afd99bSAndy Whitcroft 29684e35f483SJoonsoo Kim reserve = (end - start) - region_count(resv, start, end); 296984afd99bSAndy Whitcroft 2970f031dd27SJoonsoo Kim kref_put(&resv->refs, resv_map_release); 297184afd99bSAndy Whitcroft 29727251ff78SAdam Litke if (reserve) { 29731c5ecae3SMike Kravetz /* 29741c5ecae3SMike Kravetz * Decrement reserve counts. The global reserve count may be 29751c5ecae3SMike Kravetz * adjusted if the subpool has a minimum size. 29761c5ecae3SMike Kravetz */ 29771c5ecae3SMike Kravetz gbl_reserve = hugepage_subpool_put_pages(spool, reserve); 29781c5ecae3SMike Kravetz hugetlb_acct_memory(h, -gbl_reserve); 29797251ff78SAdam Litke } 2980a1e78772SMel Gorman } 2981a1e78772SMel Gorman 29821da177e4SLinus Torvalds /* 29831da177e4SLinus Torvalds * We cannot handle pagefaults against hugetlb pages at all. They cause 29841da177e4SLinus Torvalds * handle_mm_fault() to try to instantiate regular-sized pages in the 29851da177e4SLinus Torvalds * hugegpage VMA. do_page_fault() is supposed to trap this, so BUG is we get 29861da177e4SLinus Torvalds * this far. 29871da177e4SLinus Torvalds */ 2988d0217ac0SNick Piggin static int hugetlb_vm_op_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 29891da177e4SLinus Torvalds { 29901da177e4SLinus Torvalds BUG(); 2991d0217ac0SNick Piggin return 0; 29921da177e4SLinus Torvalds } 29931da177e4SLinus Torvalds 2994f0f37e2fSAlexey Dobriyan const struct vm_operations_struct hugetlb_vm_ops = { 2995d0217ac0SNick Piggin .fault = hugetlb_vm_op_fault, 299684afd99bSAndy Whitcroft .open = hugetlb_vm_op_open, 2997a1e78772SMel Gorman .close = hugetlb_vm_op_close, 29981da177e4SLinus Torvalds }; 29991da177e4SLinus Torvalds 30001e8f889bSDavid Gibson static pte_t make_huge_pte(struct vm_area_struct *vma, struct page *page, 30011e8f889bSDavid Gibson int writable) 300263551ae0SDavid Gibson { 300363551ae0SDavid Gibson pte_t entry; 300463551ae0SDavid Gibson 30051e8f889bSDavid Gibson if (writable) { 3006106c992aSGerald Schaefer entry = huge_pte_mkwrite(huge_pte_mkdirty(mk_huge_pte(page, 3007106c992aSGerald Schaefer vma->vm_page_prot))); 300863551ae0SDavid Gibson } else { 3009106c992aSGerald Schaefer entry = huge_pte_wrprotect(mk_huge_pte(page, 3010106c992aSGerald Schaefer vma->vm_page_prot)); 301163551ae0SDavid Gibson } 301263551ae0SDavid Gibson entry = pte_mkyoung(entry); 301363551ae0SDavid Gibson entry = pte_mkhuge(entry); 3014d9ed9faaSChris Metcalf entry = arch_make_huge_pte(entry, vma, page, writable); 301563551ae0SDavid Gibson 301663551ae0SDavid Gibson return entry; 301763551ae0SDavid Gibson } 301863551ae0SDavid Gibson 30191e8f889bSDavid Gibson static void set_huge_ptep_writable(struct vm_area_struct *vma, 30201e8f889bSDavid Gibson unsigned long address, pte_t *ptep) 30211e8f889bSDavid Gibson { 30221e8f889bSDavid Gibson pte_t entry; 30231e8f889bSDavid Gibson 3024106c992aSGerald Schaefer entry = huge_pte_mkwrite(huge_pte_mkdirty(huge_ptep_get(ptep))); 302532f84528SChris Forbes if (huge_ptep_set_access_flags(vma, address, ptep, entry, 1)) 30264b3073e1SRussell King update_mmu_cache(vma, address, ptep); 30271e8f889bSDavid Gibson } 30281e8f889bSDavid Gibson 30294a705fefSNaoya Horiguchi static int is_hugetlb_entry_migration(pte_t pte) 30304a705fefSNaoya Horiguchi { 30314a705fefSNaoya Horiguchi swp_entry_t swp; 30324a705fefSNaoya Horiguchi 30334a705fefSNaoya Horiguchi if (huge_pte_none(pte) || pte_present(pte)) 30344a705fefSNaoya Horiguchi return 0; 30354a705fefSNaoya Horiguchi swp = pte_to_swp_entry(pte); 30364a705fefSNaoya Horiguchi if (non_swap_entry(swp) && is_migration_entry(swp)) 30374a705fefSNaoya Horiguchi return 1; 30384a705fefSNaoya Horiguchi else 30394a705fefSNaoya Horiguchi return 0; 30404a705fefSNaoya Horiguchi } 30414a705fefSNaoya Horiguchi 30424a705fefSNaoya Horiguchi static int is_hugetlb_entry_hwpoisoned(pte_t pte) 30434a705fefSNaoya Horiguchi { 30444a705fefSNaoya Horiguchi swp_entry_t swp; 30454a705fefSNaoya Horiguchi 30464a705fefSNaoya Horiguchi if (huge_pte_none(pte) || pte_present(pte)) 30474a705fefSNaoya Horiguchi return 0; 30484a705fefSNaoya Horiguchi swp = pte_to_swp_entry(pte); 30494a705fefSNaoya Horiguchi if (non_swap_entry(swp) && is_hwpoison_entry(swp)) 30504a705fefSNaoya Horiguchi return 1; 30514a705fefSNaoya Horiguchi else 30524a705fefSNaoya Horiguchi return 0; 30534a705fefSNaoya Horiguchi } 30541e8f889bSDavid Gibson 305563551ae0SDavid Gibson int copy_hugetlb_page_range(struct mm_struct *dst, struct mm_struct *src, 305663551ae0SDavid Gibson struct vm_area_struct *vma) 305763551ae0SDavid Gibson { 305863551ae0SDavid Gibson pte_t *src_pte, *dst_pte, entry; 305963551ae0SDavid Gibson struct page *ptepage; 30601c59827dSHugh Dickins unsigned long addr; 30611e8f889bSDavid Gibson int cow; 3062a5516438SAndi Kleen struct hstate *h = hstate_vma(vma); 3063a5516438SAndi Kleen unsigned long sz = huge_page_size(h); 3064e8569dd2SAndreas Sandberg unsigned long mmun_start; /* For mmu_notifiers */ 3065e8569dd2SAndreas Sandberg unsigned long mmun_end; /* For mmu_notifiers */ 3066e8569dd2SAndreas Sandberg int ret = 0; 30671e8f889bSDavid Gibson 30681e8f889bSDavid Gibson cow = (vma->vm_flags & (VM_SHARED | VM_MAYWRITE)) == VM_MAYWRITE; 306963551ae0SDavid Gibson 3070e8569dd2SAndreas Sandberg mmun_start = vma->vm_start; 3071e8569dd2SAndreas Sandberg mmun_end = vma->vm_end; 3072e8569dd2SAndreas Sandberg if (cow) 3073e8569dd2SAndreas Sandberg mmu_notifier_invalidate_range_start(src, mmun_start, mmun_end); 3074e8569dd2SAndreas Sandberg 3075a5516438SAndi Kleen for (addr = vma->vm_start; addr < vma->vm_end; addr += sz) { 3076cb900f41SKirill A. Shutemov spinlock_t *src_ptl, *dst_ptl; 3077c74df32cSHugh Dickins src_pte = huge_pte_offset(src, addr); 3078c74df32cSHugh Dickins if (!src_pte) 3079c74df32cSHugh Dickins continue; 3080a5516438SAndi Kleen dst_pte = huge_pte_alloc(dst, addr, sz); 3081e8569dd2SAndreas Sandberg if (!dst_pte) { 3082e8569dd2SAndreas Sandberg ret = -ENOMEM; 3083e8569dd2SAndreas Sandberg break; 3084e8569dd2SAndreas Sandberg } 3085c5c99429SLarry Woodman 3086c5c99429SLarry Woodman /* If the pagetables are shared don't copy or take references */ 3087c5c99429SLarry Woodman if (dst_pte == src_pte) 3088c5c99429SLarry Woodman continue; 3089c5c99429SLarry Woodman 3090cb900f41SKirill A. Shutemov dst_ptl = huge_pte_lock(h, dst, dst_pte); 3091cb900f41SKirill A. Shutemov src_ptl = huge_pte_lockptr(h, src, src_pte); 3092cb900f41SKirill A. Shutemov spin_lock_nested(src_ptl, SINGLE_DEPTH_NESTING); 30934a705fefSNaoya Horiguchi entry = huge_ptep_get(src_pte); 30944a705fefSNaoya Horiguchi if (huge_pte_none(entry)) { /* skip none entry */ 30954a705fefSNaoya Horiguchi ; 30964a705fefSNaoya Horiguchi } else if (unlikely(is_hugetlb_entry_migration(entry) || 30974a705fefSNaoya Horiguchi is_hugetlb_entry_hwpoisoned(entry))) { 30984a705fefSNaoya Horiguchi swp_entry_t swp_entry = pte_to_swp_entry(entry); 30994a705fefSNaoya Horiguchi 31004a705fefSNaoya Horiguchi if (is_write_migration_entry(swp_entry) && cow) { 31014a705fefSNaoya Horiguchi /* 31024a705fefSNaoya Horiguchi * COW mappings require pages in both 31034a705fefSNaoya Horiguchi * parent and child to be set to read. 31044a705fefSNaoya Horiguchi */ 31054a705fefSNaoya Horiguchi make_migration_entry_read(&swp_entry); 31064a705fefSNaoya Horiguchi entry = swp_entry_to_pte(swp_entry); 31074a705fefSNaoya Horiguchi set_huge_pte_at(src, addr, src_pte, entry); 31084a705fefSNaoya Horiguchi } 31094a705fefSNaoya Horiguchi set_huge_pte_at(dst, addr, dst_pte, entry); 31104a705fefSNaoya Horiguchi } else { 311134ee645eSJoerg Roedel if (cow) { 31127f2e9525SGerald Schaefer huge_ptep_set_wrprotect(src, addr, src_pte); 311334ee645eSJoerg Roedel mmu_notifier_invalidate_range(src, mmun_start, 311434ee645eSJoerg Roedel mmun_end); 311534ee645eSJoerg Roedel } 31160253d634SNaoya Horiguchi entry = huge_ptep_get(src_pte); 311763551ae0SDavid Gibson ptepage = pte_page(entry); 311863551ae0SDavid Gibson get_page(ptepage); 311953f9263bSKirill A. Shutemov page_dup_rmap(ptepage, true); 312063551ae0SDavid Gibson set_huge_pte_at(dst, addr, dst_pte, entry); 31215d317b2bSNaoya Horiguchi hugetlb_count_add(pages_per_huge_page(h), dst); 31221c59827dSHugh Dickins } 3123cb900f41SKirill A. Shutemov spin_unlock(src_ptl); 3124cb900f41SKirill A. Shutemov spin_unlock(dst_ptl); 312563551ae0SDavid Gibson } 312663551ae0SDavid Gibson 3127e8569dd2SAndreas Sandberg if (cow) 3128e8569dd2SAndreas Sandberg mmu_notifier_invalidate_range_end(src, mmun_start, mmun_end); 3129e8569dd2SAndreas Sandberg 3130e8569dd2SAndreas Sandberg return ret; 313163551ae0SDavid Gibson } 313263551ae0SDavid Gibson 313324669e58SAneesh Kumar K.V void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma, 313424669e58SAneesh Kumar K.V unsigned long start, unsigned long end, 313524669e58SAneesh Kumar K.V struct page *ref_page) 313663551ae0SDavid Gibson { 313724669e58SAneesh Kumar K.V int force_flush = 0; 313863551ae0SDavid Gibson struct mm_struct *mm = vma->vm_mm; 313963551ae0SDavid Gibson unsigned long address; 3140c7546f8fSDavid Gibson pte_t *ptep; 314163551ae0SDavid Gibson pte_t pte; 3142cb900f41SKirill A. Shutemov spinlock_t *ptl; 314363551ae0SDavid Gibson struct page *page; 3144a5516438SAndi Kleen struct hstate *h = hstate_vma(vma); 3145a5516438SAndi Kleen unsigned long sz = huge_page_size(h); 31462ec74c3eSSagi Grimberg const unsigned long mmun_start = start; /* For mmu_notifiers */ 31472ec74c3eSSagi Grimberg const unsigned long mmun_end = end; /* For mmu_notifiers */ 3148a5516438SAndi Kleen 314963551ae0SDavid Gibson WARN_ON(!is_vm_hugetlb_page(vma)); 3150a5516438SAndi Kleen BUG_ON(start & ~huge_page_mask(h)); 3151a5516438SAndi Kleen BUG_ON(end & ~huge_page_mask(h)); 315263551ae0SDavid Gibson 315324669e58SAneesh Kumar K.V tlb_start_vma(tlb, vma); 31542ec74c3eSSagi Grimberg mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end); 3155569f48b8SHillf Danton address = start; 315624669e58SAneesh Kumar K.V again: 3157569f48b8SHillf Danton for (; address < end; address += sz) { 3158c7546f8fSDavid Gibson ptep = huge_pte_offset(mm, address); 3159c7546f8fSDavid Gibson if (!ptep) 3160c7546f8fSDavid Gibson continue; 3161c7546f8fSDavid Gibson 3162cb900f41SKirill A. Shutemov ptl = huge_pte_lock(h, mm, ptep); 316339dde65cSChen, Kenneth W if (huge_pmd_unshare(mm, &address, ptep)) 3164cb900f41SKirill A. Shutemov goto unlock; 316539dde65cSChen, Kenneth W 31666629326bSHillf Danton pte = huge_ptep_get(ptep); 31676629326bSHillf Danton if (huge_pte_none(pte)) 3168cb900f41SKirill A. Shutemov goto unlock; 31696629326bSHillf Danton 31706629326bSHillf Danton /* 31719fbc1f63SNaoya Horiguchi * Migrating hugepage or HWPoisoned hugepage is already 31729fbc1f63SNaoya Horiguchi * unmapped and its refcount is dropped, so just clear pte here. 31736629326bSHillf Danton */ 31749fbc1f63SNaoya Horiguchi if (unlikely(!pte_present(pte))) { 3175106c992aSGerald Schaefer huge_pte_clear(mm, address, ptep); 3176cb900f41SKirill A. Shutemov goto unlock; 31778c4894c6SNaoya Horiguchi } 31786629326bSHillf Danton 31796629326bSHillf Danton page = pte_page(pte); 318004f2cbe3SMel Gorman /* 318104f2cbe3SMel Gorman * If a reference page is supplied, it is because a specific 318204f2cbe3SMel Gorman * page is being unmapped, not a range. Ensure the page we 318304f2cbe3SMel Gorman * are about to unmap is the actual page of interest. 318404f2cbe3SMel Gorman */ 318504f2cbe3SMel Gorman if (ref_page) { 318604f2cbe3SMel Gorman if (page != ref_page) 3187cb900f41SKirill A. Shutemov goto unlock; 318804f2cbe3SMel Gorman 318904f2cbe3SMel Gorman /* 319004f2cbe3SMel Gorman * Mark the VMA as having unmapped its page so that 319104f2cbe3SMel Gorman * future faults in this VMA will fail rather than 319204f2cbe3SMel Gorman * looking like data was lost 319304f2cbe3SMel Gorman */ 319404f2cbe3SMel Gorman set_vma_resv_flags(vma, HPAGE_RESV_UNMAPPED); 319504f2cbe3SMel Gorman } 319604f2cbe3SMel Gorman 3197c7546f8fSDavid Gibson pte = huge_ptep_get_and_clear(mm, address, ptep); 319824669e58SAneesh Kumar K.V tlb_remove_tlb_entry(tlb, ptep, address); 3199106c992aSGerald Schaefer if (huge_pte_dirty(pte)) 32006649a386SKen Chen set_page_dirty(page); 32019e81130bSHillf Danton 32025d317b2bSNaoya Horiguchi hugetlb_count_sub(pages_per_huge_page(h), mm); 3203d281ee61SKirill A. Shutemov page_remove_rmap(page, true); 320424669e58SAneesh Kumar K.V force_flush = !__tlb_remove_page(tlb, page); 3205cb900f41SKirill A. Shutemov if (force_flush) { 3206569f48b8SHillf Danton address += sz; 3207cb900f41SKirill A. Shutemov spin_unlock(ptl); 32089e81130bSHillf Danton break; 320963551ae0SDavid Gibson } 3210cb900f41SKirill A. Shutemov /* Bail out after unmapping reference page if supplied */ 3211cb900f41SKirill A. Shutemov if (ref_page) { 3212cb900f41SKirill A. Shutemov spin_unlock(ptl); 3213cb900f41SKirill A. Shutemov break; 3214cb900f41SKirill A. Shutemov } 3215cb900f41SKirill A. Shutemov unlock: 3216cb900f41SKirill A. Shutemov spin_unlock(ptl); 3217cb900f41SKirill A. Shutemov } 321824669e58SAneesh Kumar K.V /* 321924669e58SAneesh Kumar K.V * mmu_gather ran out of room to batch pages, we break out of 322024669e58SAneesh Kumar K.V * the PTE lock to avoid doing the potential expensive TLB invalidate 322124669e58SAneesh Kumar K.V * and page-free while holding it. 322224669e58SAneesh Kumar K.V */ 322324669e58SAneesh Kumar K.V if (force_flush) { 322424669e58SAneesh Kumar K.V force_flush = 0; 322524669e58SAneesh Kumar K.V tlb_flush_mmu(tlb); 322624669e58SAneesh Kumar K.V if (address < end && !ref_page) 322724669e58SAneesh Kumar K.V goto again; 3228fe1668aeSChen, Kenneth W } 32292ec74c3eSSagi Grimberg mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end); 323024669e58SAneesh Kumar K.V tlb_end_vma(tlb, vma); 32311da177e4SLinus Torvalds } 323263551ae0SDavid Gibson 3233d833352aSMel Gorman void __unmap_hugepage_range_final(struct mmu_gather *tlb, 3234d833352aSMel Gorman struct vm_area_struct *vma, unsigned long start, 3235d833352aSMel Gorman unsigned long end, struct page *ref_page) 3236d833352aSMel Gorman { 3237d833352aSMel Gorman __unmap_hugepage_range(tlb, vma, start, end, ref_page); 3238d833352aSMel Gorman 3239d833352aSMel Gorman /* 3240d833352aSMel Gorman * Clear this flag so that x86's huge_pmd_share page_table_shareable 3241d833352aSMel Gorman * test will fail on a vma being torn down, and not grab a page table 3242d833352aSMel Gorman * on its way out. We're lucky that the flag has such an appropriate 3243d833352aSMel Gorman * name, and can in fact be safely cleared here. We could clear it 3244d833352aSMel Gorman * before the __unmap_hugepage_range above, but all that's necessary 3245c8c06efaSDavidlohr Bueso * is to clear it before releasing the i_mmap_rwsem. This works 3246d833352aSMel Gorman * because in the context this is called, the VMA is about to be 3247c8c06efaSDavidlohr Bueso * destroyed and the i_mmap_rwsem is held. 3248d833352aSMel Gorman */ 3249d833352aSMel Gorman vma->vm_flags &= ~VM_MAYSHARE; 3250d833352aSMel Gorman } 3251d833352aSMel Gorman 3252502717f4SChen, Kenneth W void unmap_hugepage_range(struct vm_area_struct *vma, unsigned long start, 325304f2cbe3SMel Gorman unsigned long end, struct page *ref_page) 3254502717f4SChen, Kenneth W { 325524669e58SAneesh Kumar K.V struct mm_struct *mm; 325624669e58SAneesh Kumar K.V struct mmu_gather tlb; 325724669e58SAneesh Kumar K.V 325824669e58SAneesh Kumar K.V mm = vma->vm_mm; 325924669e58SAneesh Kumar K.V 32602b047252SLinus Torvalds tlb_gather_mmu(&tlb, mm, start, end); 326124669e58SAneesh Kumar K.V __unmap_hugepage_range(&tlb, vma, start, end, ref_page); 326224669e58SAneesh Kumar K.V tlb_finish_mmu(&tlb, start, end); 3263502717f4SChen, Kenneth W } 3264502717f4SChen, Kenneth W 326504f2cbe3SMel Gorman /* 326604f2cbe3SMel Gorman * This is called when the original mapper is failing to COW a MAP_PRIVATE 326704f2cbe3SMel Gorman * mappping it owns the reserve page for. The intention is to unmap the page 326804f2cbe3SMel Gorman * from other VMAs and let the children be SIGKILLed if they are faulting the 326904f2cbe3SMel Gorman * same region. 327004f2cbe3SMel Gorman */ 32712f4612afSDavidlohr Bueso static void unmap_ref_private(struct mm_struct *mm, struct vm_area_struct *vma, 32722a4b3dedSHarvey Harrison struct page *page, unsigned long address) 327304f2cbe3SMel Gorman { 32747526674dSAdam Litke struct hstate *h = hstate_vma(vma); 327504f2cbe3SMel Gorman struct vm_area_struct *iter_vma; 327604f2cbe3SMel Gorman struct address_space *mapping; 327704f2cbe3SMel Gorman pgoff_t pgoff; 327804f2cbe3SMel Gorman 327904f2cbe3SMel Gorman /* 328004f2cbe3SMel Gorman * vm_pgoff is in PAGE_SIZE units, hence the different calculation 328104f2cbe3SMel Gorman * from page cache lookup which is in HPAGE_SIZE units. 328204f2cbe3SMel Gorman */ 32837526674dSAdam Litke address = address & huge_page_mask(h); 328436e4f20aSMichal Hocko pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + 328536e4f20aSMichal Hocko vma->vm_pgoff; 3286496ad9aaSAl Viro mapping = file_inode(vma->vm_file)->i_mapping; 328704f2cbe3SMel Gorman 32884eb2b1dcSMel Gorman /* 32894eb2b1dcSMel Gorman * Take the mapping lock for the duration of the table walk. As 32904eb2b1dcSMel Gorman * this mapping should be shared between all the VMAs, 32914eb2b1dcSMel Gorman * __unmap_hugepage_range() is called as the lock is already held 32924eb2b1dcSMel Gorman */ 329383cde9e8SDavidlohr Bueso i_mmap_lock_write(mapping); 32946b2dbba8SMichel Lespinasse vma_interval_tree_foreach(iter_vma, &mapping->i_mmap, pgoff, pgoff) { 329504f2cbe3SMel Gorman /* Do not unmap the current VMA */ 329604f2cbe3SMel Gorman if (iter_vma == vma) 329704f2cbe3SMel Gorman continue; 329804f2cbe3SMel Gorman 329904f2cbe3SMel Gorman /* 33002f84a899SMel Gorman * Shared VMAs have their own reserves and do not affect 33012f84a899SMel Gorman * MAP_PRIVATE accounting but it is possible that a shared 33022f84a899SMel Gorman * VMA is using the same page so check and skip such VMAs. 33032f84a899SMel Gorman */ 33042f84a899SMel Gorman if (iter_vma->vm_flags & VM_MAYSHARE) 33052f84a899SMel Gorman continue; 33062f84a899SMel Gorman 33072f84a899SMel Gorman /* 330804f2cbe3SMel Gorman * Unmap the page from other VMAs without their own reserves. 330904f2cbe3SMel Gorman * They get marked to be SIGKILLed if they fault in these 331004f2cbe3SMel Gorman * areas. This is because a future no-page fault on this VMA 331104f2cbe3SMel Gorman * could insert a zeroed page instead of the data existing 331204f2cbe3SMel Gorman * from the time of fork. This would look like data corruption 331304f2cbe3SMel Gorman */ 331404f2cbe3SMel Gorman if (!is_vma_resv_set(iter_vma, HPAGE_RESV_OWNER)) 331524669e58SAneesh Kumar K.V unmap_hugepage_range(iter_vma, address, 331624669e58SAneesh Kumar K.V address + huge_page_size(h), page); 331704f2cbe3SMel Gorman } 331883cde9e8SDavidlohr Bueso i_mmap_unlock_write(mapping); 331904f2cbe3SMel Gorman } 332004f2cbe3SMel Gorman 33210fe6e20bSNaoya Horiguchi /* 33220fe6e20bSNaoya Horiguchi * Hugetlb_cow() should be called with page lock of the original hugepage held. 3323ef009b25SMichal Hocko * Called with hugetlb_instantiation_mutex held and pte_page locked so we 3324ef009b25SMichal Hocko * cannot race with other handlers or page migration. 3325ef009b25SMichal Hocko * Keep the pte_same checks anyway to make transition from the mutex easier. 33260fe6e20bSNaoya Horiguchi */ 33271e8f889bSDavid Gibson static int hugetlb_cow(struct mm_struct *mm, struct vm_area_struct *vma, 332804f2cbe3SMel Gorman unsigned long address, pte_t *ptep, pte_t pte, 3329cb900f41SKirill A. Shutemov struct page *pagecache_page, spinlock_t *ptl) 33301e8f889bSDavid Gibson { 3331a5516438SAndi Kleen struct hstate *h = hstate_vma(vma); 33321e8f889bSDavid Gibson struct page *old_page, *new_page; 3333ad4404a2SDavidlohr Bueso int ret = 0, outside_reserve = 0; 33342ec74c3eSSagi Grimberg unsigned long mmun_start; /* For mmu_notifiers */ 33352ec74c3eSSagi Grimberg unsigned long mmun_end; /* For mmu_notifiers */ 33361e8f889bSDavid Gibson 33371e8f889bSDavid Gibson old_page = pte_page(pte); 33381e8f889bSDavid Gibson 333904f2cbe3SMel Gorman retry_avoidcopy: 33401e8f889bSDavid Gibson /* If no-one else is actually using this page, avoid the copy 33411e8f889bSDavid Gibson * and just make the page writable */ 334237a2140dSJoonsoo Kim if (page_mapcount(old_page) == 1 && PageAnon(old_page)) { 33430fe6e20bSNaoya Horiguchi page_move_anon_rmap(old_page, vma, address); 33441e8f889bSDavid Gibson set_huge_ptep_writable(vma, address, ptep); 334583c54070SNick Piggin return 0; 33461e8f889bSDavid Gibson } 33471e8f889bSDavid Gibson 334804f2cbe3SMel Gorman /* 334904f2cbe3SMel Gorman * If the process that created a MAP_PRIVATE mapping is about to 335004f2cbe3SMel Gorman * perform a COW due to a shared page count, attempt to satisfy 335104f2cbe3SMel Gorman * the allocation without using the existing reserves. The pagecache 335204f2cbe3SMel Gorman * page is used to determine if the reserve at this address was 335304f2cbe3SMel Gorman * consumed or not. If reserves were used, a partial faulted mapping 335404f2cbe3SMel Gorman * at the time of fork() could consume its reserves on COW instead 335504f2cbe3SMel Gorman * of the full address range. 335604f2cbe3SMel Gorman */ 33575944d011SJoonsoo Kim if (is_vma_resv_set(vma, HPAGE_RESV_OWNER) && 335804f2cbe3SMel Gorman old_page != pagecache_page) 335904f2cbe3SMel Gorman outside_reserve = 1; 336004f2cbe3SMel Gorman 336109cbfeafSKirill A. Shutemov get_page(old_page); 3362b76c8cfbSLarry Woodman 3363ad4404a2SDavidlohr Bueso /* 3364ad4404a2SDavidlohr Bueso * Drop page table lock as buddy allocator may be called. It will 3365ad4404a2SDavidlohr Bueso * be acquired again before returning to the caller, as expected. 3366ad4404a2SDavidlohr Bueso */ 3367cb900f41SKirill A. Shutemov spin_unlock(ptl); 336804f2cbe3SMel Gorman new_page = alloc_huge_page(vma, address, outside_reserve); 33691e8f889bSDavid Gibson 33702fc39cecSAdam Litke if (IS_ERR(new_page)) { 337104f2cbe3SMel Gorman /* 337204f2cbe3SMel Gorman * If a process owning a MAP_PRIVATE mapping fails to COW, 337304f2cbe3SMel Gorman * it is due to references held by a child and an insufficient 337404f2cbe3SMel Gorman * huge page pool. To guarantee the original mappers 337504f2cbe3SMel Gorman * reliability, unmap the page from child processes. The child 337604f2cbe3SMel Gorman * may get SIGKILLed if it later faults. 337704f2cbe3SMel Gorman */ 337804f2cbe3SMel Gorman if (outside_reserve) { 337909cbfeafSKirill A. Shutemov put_page(old_page); 338004f2cbe3SMel Gorman BUG_ON(huge_pte_none(pte)); 33812f4612afSDavidlohr Bueso unmap_ref_private(mm, vma, old_page, address); 338204f2cbe3SMel Gorman BUG_ON(huge_pte_none(pte)); 3383cb900f41SKirill A. Shutemov spin_lock(ptl); 3384a734bcc8SHillf Danton ptep = huge_pte_offset(mm, address & huge_page_mask(h)); 3385a9af0c5dSNaoya Horiguchi if (likely(ptep && 3386a9af0c5dSNaoya Horiguchi pte_same(huge_ptep_get(ptep), pte))) 338704f2cbe3SMel Gorman goto retry_avoidcopy; 3388a734bcc8SHillf Danton /* 3389cb900f41SKirill A. Shutemov * race occurs while re-acquiring page table 3390cb900f41SKirill A. Shutemov * lock, and our job is done. 3391a734bcc8SHillf Danton */ 3392a734bcc8SHillf Danton return 0; 339304f2cbe3SMel Gorman } 339404f2cbe3SMel Gorman 3395ad4404a2SDavidlohr Bueso ret = (PTR_ERR(new_page) == -ENOMEM) ? 3396ad4404a2SDavidlohr Bueso VM_FAULT_OOM : VM_FAULT_SIGBUS; 3397ad4404a2SDavidlohr Bueso goto out_release_old; 33981e8f889bSDavid Gibson } 33991e8f889bSDavid Gibson 34000fe6e20bSNaoya Horiguchi /* 34010fe6e20bSNaoya Horiguchi * When the original hugepage is shared one, it does not have 34020fe6e20bSNaoya Horiguchi * anon_vma prepared. 34030fe6e20bSNaoya Horiguchi */ 340444e2aa93SDean Nelson if (unlikely(anon_vma_prepare(vma))) { 3405ad4404a2SDavidlohr Bueso ret = VM_FAULT_OOM; 3406ad4404a2SDavidlohr Bueso goto out_release_all; 340744e2aa93SDean Nelson } 34080fe6e20bSNaoya Horiguchi 340947ad8475SAndrea Arcangeli copy_user_huge_page(new_page, old_page, address, vma, 341047ad8475SAndrea Arcangeli pages_per_huge_page(h)); 34110ed361deSNick Piggin __SetPageUptodate(new_page); 3412bcc54222SNaoya Horiguchi set_page_huge_active(new_page); 34131e8f889bSDavid Gibson 34142ec74c3eSSagi Grimberg mmun_start = address & huge_page_mask(h); 34152ec74c3eSSagi Grimberg mmun_end = mmun_start + huge_page_size(h); 34162ec74c3eSSagi Grimberg mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end); 3417ad4404a2SDavidlohr Bueso 3418b76c8cfbSLarry Woodman /* 3419cb900f41SKirill A. Shutemov * Retake the page table lock to check for racing updates 3420b76c8cfbSLarry Woodman * before the page tables are altered 3421b76c8cfbSLarry Woodman */ 3422cb900f41SKirill A. Shutemov spin_lock(ptl); 3423a5516438SAndi Kleen ptep = huge_pte_offset(mm, address & huge_page_mask(h)); 3424a9af0c5dSNaoya Horiguchi if (likely(ptep && pte_same(huge_ptep_get(ptep), pte))) { 342507443a85SJoonsoo Kim ClearPagePrivate(new_page); 342607443a85SJoonsoo Kim 34271e8f889bSDavid Gibson /* Break COW */ 34288fe627ecSGerald Schaefer huge_ptep_clear_flush(vma, address, ptep); 342934ee645eSJoerg Roedel mmu_notifier_invalidate_range(mm, mmun_start, mmun_end); 34301e8f889bSDavid Gibson set_huge_pte_at(mm, address, ptep, 34311e8f889bSDavid Gibson make_huge_pte(vma, new_page, 1)); 3432d281ee61SKirill A. Shutemov page_remove_rmap(old_page, true); 3433cd67f0d2SNaoya Horiguchi hugepage_add_new_anon_rmap(new_page, vma, address); 34341e8f889bSDavid Gibson /* Make the old page be freed below */ 34351e8f889bSDavid Gibson new_page = old_page; 34361e8f889bSDavid Gibson } 3437cb900f41SKirill A. Shutemov spin_unlock(ptl); 34382ec74c3eSSagi Grimberg mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end); 3439ad4404a2SDavidlohr Bueso out_release_all: 344009cbfeafSKirill A. Shutemov put_page(new_page); 3441ad4404a2SDavidlohr Bueso out_release_old: 344209cbfeafSKirill A. Shutemov put_page(old_page); 34438312034fSJoonsoo Kim 3444ad4404a2SDavidlohr Bueso spin_lock(ptl); /* Caller expects lock to be held */ 3445ad4404a2SDavidlohr Bueso return ret; 34461e8f889bSDavid Gibson } 34471e8f889bSDavid Gibson 344804f2cbe3SMel Gorman /* Return the pagecache page at a given address within a VMA */ 3449a5516438SAndi Kleen static struct page *hugetlbfs_pagecache_page(struct hstate *h, 3450a5516438SAndi Kleen struct vm_area_struct *vma, unsigned long address) 345104f2cbe3SMel Gorman { 345204f2cbe3SMel Gorman struct address_space *mapping; 3453e7c4b0bfSAndy Whitcroft pgoff_t idx; 345404f2cbe3SMel Gorman 345504f2cbe3SMel Gorman mapping = vma->vm_file->f_mapping; 3456a5516438SAndi Kleen idx = vma_hugecache_offset(h, vma, address); 345704f2cbe3SMel Gorman 345804f2cbe3SMel Gorman return find_lock_page(mapping, idx); 345904f2cbe3SMel Gorman } 346004f2cbe3SMel Gorman 34613ae77f43SHugh Dickins /* 34623ae77f43SHugh Dickins * Return whether there is a pagecache page to back given address within VMA. 34633ae77f43SHugh Dickins * Caller follow_hugetlb_page() holds page_table_lock so we cannot lock_page. 34643ae77f43SHugh Dickins */ 34653ae77f43SHugh Dickins static bool hugetlbfs_pagecache_present(struct hstate *h, 34662a15efc9SHugh Dickins struct vm_area_struct *vma, unsigned long address) 34672a15efc9SHugh Dickins { 34682a15efc9SHugh Dickins struct address_space *mapping; 34692a15efc9SHugh Dickins pgoff_t idx; 34702a15efc9SHugh Dickins struct page *page; 34712a15efc9SHugh Dickins 34722a15efc9SHugh Dickins mapping = vma->vm_file->f_mapping; 34732a15efc9SHugh Dickins idx = vma_hugecache_offset(h, vma, address); 34742a15efc9SHugh Dickins 34752a15efc9SHugh Dickins page = find_get_page(mapping, idx); 34762a15efc9SHugh Dickins if (page) 34772a15efc9SHugh Dickins put_page(page); 34782a15efc9SHugh Dickins return page != NULL; 34792a15efc9SHugh Dickins } 34802a15efc9SHugh Dickins 3481ab76ad54SMike Kravetz int huge_add_to_page_cache(struct page *page, struct address_space *mapping, 3482ab76ad54SMike Kravetz pgoff_t idx) 3483ab76ad54SMike Kravetz { 3484ab76ad54SMike Kravetz struct inode *inode = mapping->host; 3485ab76ad54SMike Kravetz struct hstate *h = hstate_inode(inode); 3486ab76ad54SMike Kravetz int err = add_to_page_cache(page, mapping, idx, GFP_KERNEL); 3487ab76ad54SMike Kravetz 3488ab76ad54SMike Kravetz if (err) 3489ab76ad54SMike Kravetz return err; 3490ab76ad54SMike Kravetz ClearPagePrivate(page); 3491ab76ad54SMike Kravetz 3492ab76ad54SMike Kravetz spin_lock(&inode->i_lock); 3493ab76ad54SMike Kravetz inode->i_blocks += blocks_per_huge_page(h); 3494ab76ad54SMike Kravetz spin_unlock(&inode->i_lock); 3495ab76ad54SMike Kravetz return 0; 3496ab76ad54SMike Kravetz } 3497ab76ad54SMike Kravetz 3498a1ed3ddaSRobert P. J. Day static int hugetlb_no_page(struct mm_struct *mm, struct vm_area_struct *vma, 34998382d914SDavidlohr Bueso struct address_space *mapping, pgoff_t idx, 3500788c7df4SHugh Dickins unsigned long address, pte_t *ptep, unsigned int flags) 3501ac9b9c66SHugh Dickins { 3502a5516438SAndi Kleen struct hstate *h = hstate_vma(vma); 3503ac9b9c66SHugh Dickins int ret = VM_FAULT_SIGBUS; 3504409eb8c2SHillf Danton int anon_rmap = 0; 35054c887265SAdam Litke unsigned long size; 35064c887265SAdam Litke struct page *page; 35071e8f889bSDavid Gibson pte_t new_pte; 3508cb900f41SKirill A. Shutemov spinlock_t *ptl; 35094c887265SAdam Litke 351004f2cbe3SMel Gorman /* 351104f2cbe3SMel Gorman * Currently, we are forced to kill the process in the event the 351204f2cbe3SMel Gorman * original mapper has unmapped pages from the child due to a failed 351325985edcSLucas De Marchi * COW. Warn that such a situation has occurred as it may not be obvious 351404f2cbe3SMel Gorman */ 351504f2cbe3SMel Gorman if (is_vma_resv_set(vma, HPAGE_RESV_UNMAPPED)) { 3516910154d5SGeoffrey Thomas pr_warn_ratelimited("PID %d killed due to inadequate hugepage pool\n", 351704f2cbe3SMel Gorman current->pid); 351804f2cbe3SMel Gorman return ret; 351904f2cbe3SMel Gorman } 352004f2cbe3SMel Gorman 35214c887265SAdam Litke /* 35224c887265SAdam Litke * Use page lock to guard against racing truncation 35234c887265SAdam Litke * before we get page_table_lock. 35244c887265SAdam Litke */ 35256bda666aSChristoph Lameter retry: 35266bda666aSChristoph Lameter page = find_lock_page(mapping, idx); 35276bda666aSChristoph Lameter if (!page) { 3528a5516438SAndi Kleen size = i_size_read(mapping->host) >> huge_page_shift(h); 3529ebed4bfcSHugh Dickins if (idx >= size) 3530ebed4bfcSHugh Dickins goto out; 353104f2cbe3SMel Gorman page = alloc_huge_page(vma, address, 0); 35322fc39cecSAdam Litke if (IS_ERR(page)) { 353376dcee75SAneesh Kumar K.V ret = PTR_ERR(page); 353476dcee75SAneesh Kumar K.V if (ret == -ENOMEM) 353576dcee75SAneesh Kumar K.V ret = VM_FAULT_OOM; 353676dcee75SAneesh Kumar K.V else 353776dcee75SAneesh Kumar K.V ret = VM_FAULT_SIGBUS; 35386bda666aSChristoph Lameter goto out; 35396bda666aSChristoph Lameter } 354047ad8475SAndrea Arcangeli clear_huge_page(page, address, pages_per_huge_page(h)); 35410ed361deSNick Piggin __SetPageUptodate(page); 3542bcc54222SNaoya Horiguchi set_page_huge_active(page); 3543ac9b9c66SHugh Dickins 3544f83a275dSMel Gorman if (vma->vm_flags & VM_MAYSHARE) { 3545ab76ad54SMike Kravetz int err = huge_add_to_page_cache(page, mapping, idx); 35466bda666aSChristoph Lameter if (err) { 35476bda666aSChristoph Lameter put_page(page); 35486bda666aSChristoph Lameter if (err == -EEXIST) 35496bda666aSChristoph Lameter goto retry; 35506bda666aSChristoph Lameter goto out; 35516bda666aSChristoph Lameter } 355223be7468SMel Gorman } else { 35536bda666aSChristoph Lameter lock_page(page); 35540fe6e20bSNaoya Horiguchi if (unlikely(anon_vma_prepare(vma))) { 35550fe6e20bSNaoya Horiguchi ret = VM_FAULT_OOM; 35560fe6e20bSNaoya Horiguchi goto backout_unlocked; 355723be7468SMel Gorman } 3558409eb8c2SHillf Danton anon_rmap = 1; 35590fe6e20bSNaoya Horiguchi } 35600fe6e20bSNaoya Horiguchi } else { 356157303d80SAndy Whitcroft /* 3562998b4382SNaoya Horiguchi * If memory error occurs between mmap() and fault, some process 3563998b4382SNaoya Horiguchi * don't have hwpoisoned swap entry for errored virtual address. 3564998b4382SNaoya Horiguchi * So we need to block hugepage fault by PG_hwpoison bit check. 3565fd6a03edSNaoya Horiguchi */ 3566fd6a03edSNaoya Horiguchi if (unlikely(PageHWPoison(page))) { 3567aa50d3a7SAndi Kleen ret = VM_FAULT_HWPOISON | 3568972dc4deSAneesh Kumar K.V VM_FAULT_SET_HINDEX(hstate_index(h)); 3569fd6a03edSNaoya Horiguchi goto backout_unlocked; 35706bda666aSChristoph Lameter } 3571998b4382SNaoya Horiguchi } 35721e8f889bSDavid Gibson 357357303d80SAndy Whitcroft /* 357457303d80SAndy Whitcroft * If we are going to COW a private mapping later, we examine the 357557303d80SAndy Whitcroft * pending reservations for this page now. This will ensure that 357657303d80SAndy Whitcroft * any allocations necessary to record that reservation occur outside 357757303d80SAndy Whitcroft * the spinlock. 357857303d80SAndy Whitcroft */ 35795e911373SMike Kravetz if ((flags & FAULT_FLAG_WRITE) && !(vma->vm_flags & VM_SHARED)) { 35802b26736cSAndy Whitcroft if (vma_needs_reservation(h, vma, address) < 0) { 35812b26736cSAndy Whitcroft ret = VM_FAULT_OOM; 35822b26736cSAndy Whitcroft goto backout_unlocked; 35832b26736cSAndy Whitcroft } 35845e911373SMike Kravetz /* Just decrements count, does not deallocate */ 3585feba16e2SMike Kravetz vma_end_reservation(h, vma, address); 35865e911373SMike Kravetz } 358757303d80SAndy Whitcroft 3588cb900f41SKirill A. Shutemov ptl = huge_pte_lockptr(h, mm, ptep); 3589cb900f41SKirill A. Shutemov spin_lock(ptl); 3590a5516438SAndi Kleen size = i_size_read(mapping->host) >> huge_page_shift(h); 35914c887265SAdam Litke if (idx >= size) 35924c887265SAdam Litke goto backout; 35934c887265SAdam Litke 359483c54070SNick Piggin ret = 0; 35957f2e9525SGerald Schaefer if (!huge_pte_none(huge_ptep_get(ptep))) 35964c887265SAdam Litke goto backout; 35974c887265SAdam Litke 359807443a85SJoonsoo Kim if (anon_rmap) { 359907443a85SJoonsoo Kim ClearPagePrivate(page); 3600409eb8c2SHillf Danton hugepage_add_new_anon_rmap(page, vma, address); 3601ac714904SChoi Gi-yong } else 360253f9263bSKirill A. Shutemov page_dup_rmap(page, true); 36031e8f889bSDavid Gibson new_pte = make_huge_pte(vma, page, ((vma->vm_flags & VM_WRITE) 36041e8f889bSDavid Gibson && (vma->vm_flags & VM_SHARED))); 36051e8f889bSDavid Gibson set_huge_pte_at(mm, address, ptep, new_pte); 36061e8f889bSDavid Gibson 36075d317b2bSNaoya Horiguchi hugetlb_count_add(pages_per_huge_page(h), mm); 3608788c7df4SHugh Dickins if ((flags & FAULT_FLAG_WRITE) && !(vma->vm_flags & VM_SHARED)) { 36091e8f889bSDavid Gibson /* Optimization, do the COW without a second fault */ 3610cb900f41SKirill A. Shutemov ret = hugetlb_cow(mm, vma, address, ptep, new_pte, page, ptl); 36111e8f889bSDavid Gibson } 36121e8f889bSDavid Gibson 3613cb900f41SKirill A. Shutemov spin_unlock(ptl); 36144c887265SAdam Litke unlock_page(page); 36154c887265SAdam Litke out: 3616ac9b9c66SHugh Dickins return ret; 36174c887265SAdam Litke 36184c887265SAdam Litke backout: 3619cb900f41SKirill A. Shutemov spin_unlock(ptl); 36202b26736cSAndy Whitcroft backout_unlocked: 36214c887265SAdam Litke unlock_page(page); 36224c887265SAdam Litke put_page(page); 36234c887265SAdam Litke goto out; 3624ac9b9c66SHugh Dickins } 3625ac9b9c66SHugh Dickins 36268382d914SDavidlohr Bueso #ifdef CONFIG_SMP 3627c672c7f2SMike Kravetz u32 hugetlb_fault_mutex_hash(struct hstate *h, struct mm_struct *mm, 36288382d914SDavidlohr Bueso struct vm_area_struct *vma, 36298382d914SDavidlohr Bueso struct address_space *mapping, 36308382d914SDavidlohr Bueso pgoff_t idx, unsigned long address) 36318382d914SDavidlohr Bueso { 36328382d914SDavidlohr Bueso unsigned long key[2]; 36338382d914SDavidlohr Bueso u32 hash; 36348382d914SDavidlohr Bueso 36358382d914SDavidlohr Bueso if (vma->vm_flags & VM_SHARED) { 36368382d914SDavidlohr Bueso key[0] = (unsigned long) mapping; 36378382d914SDavidlohr Bueso key[1] = idx; 36388382d914SDavidlohr Bueso } else { 36398382d914SDavidlohr Bueso key[0] = (unsigned long) mm; 36408382d914SDavidlohr Bueso key[1] = address >> huge_page_shift(h); 36418382d914SDavidlohr Bueso } 36428382d914SDavidlohr Bueso 36438382d914SDavidlohr Bueso hash = jhash2((u32 *)&key, sizeof(key)/sizeof(u32), 0); 36448382d914SDavidlohr Bueso 36458382d914SDavidlohr Bueso return hash & (num_fault_mutexes - 1); 36468382d914SDavidlohr Bueso } 36478382d914SDavidlohr Bueso #else 36488382d914SDavidlohr Bueso /* 36498382d914SDavidlohr Bueso * For uniprocesor systems we always use a single mutex, so just 36508382d914SDavidlohr Bueso * return 0 and avoid the hashing overhead. 36518382d914SDavidlohr Bueso */ 3652c672c7f2SMike Kravetz u32 hugetlb_fault_mutex_hash(struct hstate *h, struct mm_struct *mm, 36538382d914SDavidlohr Bueso struct vm_area_struct *vma, 36548382d914SDavidlohr Bueso struct address_space *mapping, 36558382d914SDavidlohr Bueso pgoff_t idx, unsigned long address) 36568382d914SDavidlohr Bueso { 36578382d914SDavidlohr Bueso return 0; 36588382d914SDavidlohr Bueso } 36598382d914SDavidlohr Bueso #endif 36608382d914SDavidlohr Bueso 366186e5216fSAdam Litke int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma, 3662788c7df4SHugh Dickins unsigned long address, unsigned int flags) 366386e5216fSAdam Litke { 36648382d914SDavidlohr Bueso pte_t *ptep, entry; 3665cb900f41SKirill A. Shutemov spinlock_t *ptl; 36661e8f889bSDavid Gibson int ret; 36678382d914SDavidlohr Bueso u32 hash; 36688382d914SDavidlohr Bueso pgoff_t idx; 36690fe6e20bSNaoya Horiguchi struct page *page = NULL; 367057303d80SAndy Whitcroft struct page *pagecache_page = NULL; 3671a5516438SAndi Kleen struct hstate *h = hstate_vma(vma); 36728382d914SDavidlohr Bueso struct address_space *mapping; 36730f792cf9SNaoya Horiguchi int need_wait_lock = 0; 367486e5216fSAdam Litke 36751e16a539SKAMEZAWA Hiroyuki address &= huge_page_mask(h); 36761e16a539SKAMEZAWA Hiroyuki 3677fd6a03edSNaoya Horiguchi ptep = huge_pte_offset(mm, address); 3678fd6a03edSNaoya Horiguchi if (ptep) { 3679fd6a03edSNaoya Horiguchi entry = huge_ptep_get(ptep); 3680290408d4SNaoya Horiguchi if (unlikely(is_hugetlb_entry_migration(entry))) { 3681cb900f41SKirill A. Shutemov migration_entry_wait_huge(vma, mm, ptep); 3682290408d4SNaoya Horiguchi return 0; 3683290408d4SNaoya Horiguchi } else if (unlikely(is_hugetlb_entry_hwpoisoned(entry))) 3684aa50d3a7SAndi Kleen return VM_FAULT_HWPOISON_LARGE | 3685972dc4deSAneesh Kumar K.V VM_FAULT_SET_HINDEX(hstate_index(h)); 36860d777df5SNaoya Horiguchi } else { 3687a5516438SAndi Kleen ptep = huge_pte_alloc(mm, address, huge_page_size(h)); 368886e5216fSAdam Litke if (!ptep) 368986e5216fSAdam Litke return VM_FAULT_OOM; 36900d777df5SNaoya Horiguchi } 369186e5216fSAdam Litke 36928382d914SDavidlohr Bueso mapping = vma->vm_file->f_mapping; 36938382d914SDavidlohr Bueso idx = vma_hugecache_offset(h, vma, address); 36948382d914SDavidlohr Bueso 36953935baa9SDavid Gibson /* 36963935baa9SDavid Gibson * Serialize hugepage allocation and instantiation, so that we don't 36973935baa9SDavid Gibson * get spurious allocation failures if two CPUs race to instantiate 36983935baa9SDavid Gibson * the same page in the page cache. 36993935baa9SDavid Gibson */ 3700c672c7f2SMike Kravetz hash = hugetlb_fault_mutex_hash(h, mm, vma, mapping, idx, address); 3701c672c7f2SMike Kravetz mutex_lock(&hugetlb_fault_mutex_table[hash]); 37028382d914SDavidlohr Bueso 37037f2e9525SGerald Schaefer entry = huge_ptep_get(ptep); 37047f2e9525SGerald Schaefer if (huge_pte_none(entry)) { 37058382d914SDavidlohr Bueso ret = hugetlb_no_page(mm, vma, mapping, idx, address, ptep, flags); 3706b4d1d99fSDavid Gibson goto out_mutex; 37073935baa9SDavid Gibson } 370886e5216fSAdam Litke 370983c54070SNick Piggin ret = 0; 37101e8f889bSDavid Gibson 371157303d80SAndy Whitcroft /* 37120f792cf9SNaoya Horiguchi * entry could be a migration/hwpoison entry at this point, so this 37130f792cf9SNaoya Horiguchi * check prevents the kernel from going below assuming that we have 37140f792cf9SNaoya Horiguchi * a active hugepage in pagecache. This goto expects the 2nd page fault, 37150f792cf9SNaoya Horiguchi * and is_hugetlb_entry_(migration|hwpoisoned) check will properly 37160f792cf9SNaoya Horiguchi * handle it. 37170f792cf9SNaoya Horiguchi */ 37180f792cf9SNaoya Horiguchi if (!pte_present(entry)) 37190f792cf9SNaoya Horiguchi goto out_mutex; 37200f792cf9SNaoya Horiguchi 37210f792cf9SNaoya Horiguchi /* 372257303d80SAndy Whitcroft * If we are going to COW the mapping later, we examine the pending 372357303d80SAndy Whitcroft * reservations for this page now. This will ensure that any 372457303d80SAndy Whitcroft * allocations necessary to record that reservation occur outside the 372557303d80SAndy Whitcroft * spinlock. For private mappings, we also lookup the pagecache 372657303d80SAndy Whitcroft * page now as it is used to determine if a reservation has been 372757303d80SAndy Whitcroft * consumed. 372857303d80SAndy Whitcroft */ 3729106c992aSGerald Schaefer if ((flags & FAULT_FLAG_WRITE) && !huge_pte_write(entry)) { 37302b26736cSAndy Whitcroft if (vma_needs_reservation(h, vma, address) < 0) { 37312b26736cSAndy Whitcroft ret = VM_FAULT_OOM; 3732b4d1d99fSDavid Gibson goto out_mutex; 37332b26736cSAndy Whitcroft } 37345e911373SMike Kravetz /* Just decrements count, does not deallocate */ 3735feba16e2SMike Kravetz vma_end_reservation(h, vma, address); 373657303d80SAndy Whitcroft 3737f83a275dSMel Gorman if (!(vma->vm_flags & VM_MAYSHARE)) 373857303d80SAndy Whitcroft pagecache_page = hugetlbfs_pagecache_page(h, 373957303d80SAndy Whitcroft vma, address); 374057303d80SAndy Whitcroft } 374157303d80SAndy Whitcroft 37420f792cf9SNaoya Horiguchi ptl = huge_pte_lock(h, mm, ptep); 37430fe6e20bSNaoya Horiguchi 37441e8f889bSDavid Gibson /* Check for a racing update before calling hugetlb_cow */ 3745b4d1d99fSDavid Gibson if (unlikely(!pte_same(entry, huge_ptep_get(ptep)))) 3746cb900f41SKirill A. Shutemov goto out_ptl; 3747b4d1d99fSDavid Gibson 37480f792cf9SNaoya Horiguchi /* 37490f792cf9SNaoya Horiguchi * hugetlb_cow() requires page locks of pte_page(entry) and 37500f792cf9SNaoya Horiguchi * pagecache_page, so here we need take the former one 37510f792cf9SNaoya Horiguchi * when page != pagecache_page or !pagecache_page. 37520f792cf9SNaoya Horiguchi */ 37530f792cf9SNaoya Horiguchi page = pte_page(entry); 37540f792cf9SNaoya Horiguchi if (page != pagecache_page) 37550f792cf9SNaoya Horiguchi if (!trylock_page(page)) { 37560f792cf9SNaoya Horiguchi need_wait_lock = 1; 37570f792cf9SNaoya Horiguchi goto out_ptl; 37580f792cf9SNaoya Horiguchi } 37590f792cf9SNaoya Horiguchi 37600f792cf9SNaoya Horiguchi get_page(page); 3761b4d1d99fSDavid Gibson 3762788c7df4SHugh Dickins if (flags & FAULT_FLAG_WRITE) { 3763106c992aSGerald Schaefer if (!huge_pte_write(entry)) { 376457303d80SAndy Whitcroft ret = hugetlb_cow(mm, vma, address, ptep, entry, 3765cb900f41SKirill A. Shutemov pagecache_page, ptl); 37660f792cf9SNaoya Horiguchi goto out_put_page; 3767b4d1d99fSDavid Gibson } 3768106c992aSGerald Schaefer entry = huge_pte_mkdirty(entry); 3769b4d1d99fSDavid Gibson } 3770b4d1d99fSDavid Gibson entry = pte_mkyoung(entry); 3771788c7df4SHugh Dickins if (huge_ptep_set_access_flags(vma, address, ptep, entry, 3772788c7df4SHugh Dickins flags & FAULT_FLAG_WRITE)) 37734b3073e1SRussell King update_mmu_cache(vma, address, ptep); 37740f792cf9SNaoya Horiguchi out_put_page: 37750f792cf9SNaoya Horiguchi if (page != pagecache_page) 37760f792cf9SNaoya Horiguchi unlock_page(page); 37770f792cf9SNaoya Horiguchi put_page(page); 3778cb900f41SKirill A. Shutemov out_ptl: 3779cb900f41SKirill A. Shutemov spin_unlock(ptl); 378057303d80SAndy Whitcroft 378157303d80SAndy Whitcroft if (pagecache_page) { 378257303d80SAndy Whitcroft unlock_page(pagecache_page); 378357303d80SAndy Whitcroft put_page(pagecache_page); 378457303d80SAndy Whitcroft } 3785b4d1d99fSDavid Gibson out_mutex: 3786c672c7f2SMike Kravetz mutex_unlock(&hugetlb_fault_mutex_table[hash]); 37870f792cf9SNaoya Horiguchi /* 37880f792cf9SNaoya Horiguchi * Generally it's safe to hold refcount during waiting page lock. But 37890f792cf9SNaoya Horiguchi * here we just wait to defer the next page fault to avoid busy loop and 37900f792cf9SNaoya Horiguchi * the page is not used after unlocked before returning from the current 37910f792cf9SNaoya Horiguchi * page fault. So we are safe from accessing freed page, even if we wait 37920f792cf9SNaoya Horiguchi * here without taking refcount. 37930f792cf9SNaoya Horiguchi */ 37940f792cf9SNaoya Horiguchi if (need_wait_lock) 37950f792cf9SNaoya Horiguchi wait_on_page_locked(page); 37961e8f889bSDavid Gibson return ret; 379786e5216fSAdam Litke } 379886e5216fSAdam Litke 379928a35716SMichel Lespinasse long follow_hugetlb_page(struct mm_struct *mm, struct vm_area_struct *vma, 380063551ae0SDavid Gibson struct page **pages, struct vm_area_struct **vmas, 380128a35716SMichel Lespinasse unsigned long *position, unsigned long *nr_pages, 380228a35716SMichel Lespinasse long i, unsigned int flags) 380363551ae0SDavid Gibson { 3804d5d4b0aaSChen, Kenneth W unsigned long pfn_offset; 3805d5d4b0aaSChen, Kenneth W unsigned long vaddr = *position; 380628a35716SMichel Lespinasse unsigned long remainder = *nr_pages; 3807a5516438SAndi Kleen struct hstate *h = hstate_vma(vma); 380863551ae0SDavid Gibson 380963551ae0SDavid Gibson while (vaddr < vma->vm_end && remainder) { 381063551ae0SDavid Gibson pte_t *pte; 3811cb900f41SKirill A. Shutemov spinlock_t *ptl = NULL; 38122a15efc9SHugh Dickins int absent; 381363551ae0SDavid Gibson struct page *page; 381463551ae0SDavid Gibson 38154c887265SAdam Litke /* 381602057967SDavid Rientjes * If we have a pending SIGKILL, don't keep faulting pages and 381702057967SDavid Rientjes * potentially allocating memory. 381802057967SDavid Rientjes */ 381902057967SDavid Rientjes if (unlikely(fatal_signal_pending(current))) { 382002057967SDavid Rientjes remainder = 0; 382102057967SDavid Rientjes break; 382202057967SDavid Rientjes } 382302057967SDavid Rientjes 382402057967SDavid Rientjes /* 38254c887265SAdam Litke * Some archs (sparc64, sh*) have multiple pte_ts to 38262a15efc9SHugh Dickins * each hugepage. We have to make sure we get the 38274c887265SAdam Litke * first, for the page indexing below to work. 3828cb900f41SKirill A. Shutemov * 3829cb900f41SKirill A. Shutemov * Note that page table lock is not held when pte is null. 38304c887265SAdam Litke */ 3831a5516438SAndi Kleen pte = huge_pte_offset(mm, vaddr & huge_page_mask(h)); 3832cb900f41SKirill A. Shutemov if (pte) 3833cb900f41SKirill A. Shutemov ptl = huge_pte_lock(h, mm, pte); 38342a15efc9SHugh Dickins absent = !pte || huge_pte_none(huge_ptep_get(pte)); 383563551ae0SDavid Gibson 38362a15efc9SHugh Dickins /* 38372a15efc9SHugh Dickins * When coredumping, it suits get_dump_page if we just return 38383ae77f43SHugh Dickins * an error where there's an empty slot with no huge pagecache 38393ae77f43SHugh Dickins * to back it. This way, we avoid allocating a hugepage, and 38403ae77f43SHugh Dickins * the sparse dumpfile avoids allocating disk blocks, but its 38413ae77f43SHugh Dickins * huge holes still show up with zeroes where they need to be. 38422a15efc9SHugh Dickins */ 38433ae77f43SHugh Dickins if (absent && (flags & FOLL_DUMP) && 38443ae77f43SHugh Dickins !hugetlbfs_pagecache_present(h, vma, vaddr)) { 3845cb900f41SKirill A. Shutemov if (pte) 3846cb900f41SKirill A. Shutemov spin_unlock(ptl); 38472a15efc9SHugh Dickins remainder = 0; 38482a15efc9SHugh Dickins break; 38492a15efc9SHugh Dickins } 38502a15efc9SHugh Dickins 38519cc3a5bdSNaoya Horiguchi /* 38529cc3a5bdSNaoya Horiguchi * We need call hugetlb_fault for both hugepages under migration 38539cc3a5bdSNaoya Horiguchi * (in which case hugetlb_fault waits for the migration,) and 38549cc3a5bdSNaoya Horiguchi * hwpoisoned hugepages (in which case we need to prevent the 38559cc3a5bdSNaoya Horiguchi * caller from accessing to them.) In order to do this, we use 38569cc3a5bdSNaoya Horiguchi * here is_swap_pte instead of is_hugetlb_entry_migration and 38579cc3a5bdSNaoya Horiguchi * is_hugetlb_entry_hwpoisoned. This is because it simply covers 38589cc3a5bdSNaoya Horiguchi * both cases, and because we can't follow correct pages 38599cc3a5bdSNaoya Horiguchi * directly from any kind of swap entries. 38609cc3a5bdSNaoya Horiguchi */ 38619cc3a5bdSNaoya Horiguchi if (absent || is_swap_pte(huge_ptep_get(pte)) || 3862106c992aSGerald Schaefer ((flags & FOLL_WRITE) && 3863106c992aSGerald Schaefer !huge_pte_write(huge_ptep_get(pte)))) { 38644c887265SAdam Litke int ret; 38654c887265SAdam Litke 3866cb900f41SKirill A. Shutemov if (pte) 3867cb900f41SKirill A. Shutemov spin_unlock(ptl); 38682a15efc9SHugh Dickins ret = hugetlb_fault(mm, vma, vaddr, 38692a15efc9SHugh Dickins (flags & FOLL_WRITE) ? FAULT_FLAG_WRITE : 0); 3870a89182c7SAdam Litke if (!(ret & VM_FAULT_ERROR)) 38714c887265SAdam Litke continue; 38724c887265SAdam Litke 38731c59827dSHugh Dickins remainder = 0; 38741c59827dSHugh Dickins break; 38751c59827dSHugh Dickins } 387663551ae0SDavid Gibson 3877a5516438SAndi Kleen pfn_offset = (vaddr & ~huge_page_mask(h)) >> PAGE_SHIFT; 38787f2e9525SGerald Schaefer page = pte_page(huge_ptep_get(pte)); 3879d5d4b0aaSChen, Kenneth W same_page: 3880d6692183SChen, Kenneth W if (pages) { 388169d177c2SAndy Whitcroft pages[i] = mem_map_offset(page, pfn_offset); 3882ddc58f27SKirill A. Shutemov get_page(pages[i]); 3883d6692183SChen, Kenneth W } 388463551ae0SDavid Gibson 388563551ae0SDavid Gibson if (vmas) 388663551ae0SDavid Gibson vmas[i] = vma; 388763551ae0SDavid Gibson 388863551ae0SDavid Gibson vaddr += PAGE_SIZE; 3889d5d4b0aaSChen, Kenneth W ++pfn_offset; 389063551ae0SDavid Gibson --remainder; 389163551ae0SDavid Gibson ++i; 3892d5d4b0aaSChen, Kenneth W if (vaddr < vma->vm_end && remainder && 3893a5516438SAndi Kleen pfn_offset < pages_per_huge_page(h)) { 3894d5d4b0aaSChen, Kenneth W /* 3895d5d4b0aaSChen, Kenneth W * We use pfn_offset to avoid touching the pageframes 3896d5d4b0aaSChen, Kenneth W * of this compound page. 3897d5d4b0aaSChen, Kenneth W */ 3898d5d4b0aaSChen, Kenneth W goto same_page; 3899d5d4b0aaSChen, Kenneth W } 3900cb900f41SKirill A. Shutemov spin_unlock(ptl); 390163551ae0SDavid Gibson } 390228a35716SMichel Lespinasse *nr_pages = remainder; 390363551ae0SDavid Gibson *position = vaddr; 390463551ae0SDavid Gibson 39052a15efc9SHugh Dickins return i ? i : -EFAULT; 390663551ae0SDavid Gibson } 39078f860591SZhang, Yanmin 39087da4d641SPeter Zijlstra unsigned long hugetlb_change_protection(struct vm_area_struct *vma, 39098f860591SZhang, Yanmin unsigned long address, unsigned long end, pgprot_t newprot) 39108f860591SZhang, Yanmin { 39118f860591SZhang, Yanmin struct mm_struct *mm = vma->vm_mm; 39128f860591SZhang, Yanmin unsigned long start = address; 39138f860591SZhang, Yanmin pte_t *ptep; 39148f860591SZhang, Yanmin pte_t pte; 3915a5516438SAndi Kleen struct hstate *h = hstate_vma(vma); 39167da4d641SPeter Zijlstra unsigned long pages = 0; 39178f860591SZhang, Yanmin 39188f860591SZhang, Yanmin BUG_ON(address >= end); 39198f860591SZhang, Yanmin flush_cache_range(vma, address, end); 39208f860591SZhang, Yanmin 3921a5338093SRik van Riel mmu_notifier_invalidate_range_start(mm, start, end); 392283cde9e8SDavidlohr Bueso i_mmap_lock_write(vma->vm_file->f_mapping); 3923a5516438SAndi Kleen for (; address < end; address += huge_page_size(h)) { 3924cb900f41SKirill A. Shutemov spinlock_t *ptl; 39258f860591SZhang, Yanmin ptep = huge_pte_offset(mm, address); 39268f860591SZhang, Yanmin if (!ptep) 39278f860591SZhang, Yanmin continue; 3928cb900f41SKirill A. Shutemov ptl = huge_pte_lock(h, mm, ptep); 39297da4d641SPeter Zijlstra if (huge_pmd_unshare(mm, &address, ptep)) { 39307da4d641SPeter Zijlstra pages++; 3931cb900f41SKirill A. Shutemov spin_unlock(ptl); 393239dde65cSChen, Kenneth W continue; 39337da4d641SPeter Zijlstra } 3934a8bda28dSNaoya Horiguchi pte = huge_ptep_get(ptep); 3935a8bda28dSNaoya Horiguchi if (unlikely(is_hugetlb_entry_hwpoisoned(pte))) { 3936a8bda28dSNaoya Horiguchi spin_unlock(ptl); 3937a8bda28dSNaoya Horiguchi continue; 3938a8bda28dSNaoya Horiguchi } 3939a8bda28dSNaoya Horiguchi if (unlikely(is_hugetlb_entry_migration(pte))) { 3940a8bda28dSNaoya Horiguchi swp_entry_t entry = pte_to_swp_entry(pte); 3941a8bda28dSNaoya Horiguchi 3942a8bda28dSNaoya Horiguchi if (is_write_migration_entry(entry)) { 3943a8bda28dSNaoya Horiguchi pte_t newpte; 3944a8bda28dSNaoya Horiguchi 3945a8bda28dSNaoya Horiguchi make_migration_entry_read(&entry); 3946a8bda28dSNaoya Horiguchi newpte = swp_entry_to_pte(entry); 3947a8bda28dSNaoya Horiguchi set_huge_pte_at(mm, address, ptep, newpte); 3948a8bda28dSNaoya Horiguchi pages++; 3949a8bda28dSNaoya Horiguchi } 3950a8bda28dSNaoya Horiguchi spin_unlock(ptl); 3951a8bda28dSNaoya Horiguchi continue; 3952a8bda28dSNaoya Horiguchi } 3953a8bda28dSNaoya Horiguchi if (!huge_pte_none(pte)) { 39548f860591SZhang, Yanmin pte = huge_ptep_get_and_clear(mm, address, ptep); 3955106c992aSGerald Schaefer pte = pte_mkhuge(huge_pte_modify(pte, newprot)); 3956be7517d6STony Lu pte = arch_make_huge_pte(pte, vma, NULL, 0); 39578f860591SZhang, Yanmin set_huge_pte_at(mm, address, ptep, pte); 39587da4d641SPeter Zijlstra pages++; 39598f860591SZhang, Yanmin } 3960cb900f41SKirill A. Shutemov spin_unlock(ptl); 39618f860591SZhang, Yanmin } 3962d833352aSMel Gorman /* 3963c8c06efaSDavidlohr Bueso * Must flush TLB before releasing i_mmap_rwsem: x86's huge_pmd_unshare 3964d833352aSMel Gorman * may have cleared our pud entry and done put_page on the page table: 3965c8c06efaSDavidlohr Bueso * once we release i_mmap_rwsem, another task can do the final put_page 3966d833352aSMel Gorman * and that page table be reused and filled with junk. 3967d833352aSMel Gorman */ 39688f860591SZhang, Yanmin flush_tlb_range(vma, start, end); 396934ee645eSJoerg Roedel mmu_notifier_invalidate_range(mm, start, end); 397083cde9e8SDavidlohr Bueso i_mmap_unlock_write(vma->vm_file->f_mapping); 3971a5338093SRik van Riel mmu_notifier_invalidate_range_end(mm, start, end); 39727da4d641SPeter Zijlstra 39737da4d641SPeter Zijlstra return pages << h->order; 39748f860591SZhang, Yanmin } 39758f860591SZhang, Yanmin 3976a1e78772SMel Gorman int hugetlb_reserve_pages(struct inode *inode, 3977a1e78772SMel Gorman long from, long to, 39785a6fe125SMel Gorman struct vm_area_struct *vma, 3979ca16d140SKOSAKI Motohiro vm_flags_t vm_flags) 3980e4e574b7SAdam Litke { 398117c9d12eSMel Gorman long ret, chg; 3982a5516438SAndi Kleen struct hstate *h = hstate_inode(inode); 398390481622SDavid Gibson struct hugepage_subpool *spool = subpool_inode(inode); 39849119a41eSJoonsoo Kim struct resv_map *resv_map; 39851c5ecae3SMike Kravetz long gbl_reserve; 3986e4e574b7SAdam Litke 3987a1e78772SMel Gorman /* 398817c9d12eSMel Gorman * Only apply hugepage reservation if asked. At fault time, an 398917c9d12eSMel Gorman * attempt will be made for VM_NORESERVE to allocate a page 399090481622SDavid Gibson * without using reserves 399117c9d12eSMel Gorman */ 3992ca16d140SKOSAKI Motohiro if (vm_flags & VM_NORESERVE) 399317c9d12eSMel Gorman return 0; 399417c9d12eSMel Gorman 399517c9d12eSMel Gorman /* 3996a1e78772SMel Gorman * Shared mappings base their reservation on the number of pages that 3997a1e78772SMel Gorman * are already allocated on behalf of the file. Private mappings need 3998a1e78772SMel Gorman * to reserve the full area even if read-only as mprotect() may be 3999a1e78772SMel Gorman * called to make the mapping read-write. Assume !vma is a shm mapping 4000a1e78772SMel Gorman */ 40019119a41eSJoonsoo Kim if (!vma || vma->vm_flags & VM_MAYSHARE) { 40024e35f483SJoonsoo Kim resv_map = inode_resv_map(inode); 40039119a41eSJoonsoo Kim 40041406ec9bSJoonsoo Kim chg = region_chg(resv_map, from, to); 40059119a41eSJoonsoo Kim 40069119a41eSJoonsoo Kim } else { 40079119a41eSJoonsoo Kim resv_map = resv_map_alloc(); 40085a6fe125SMel Gorman if (!resv_map) 40095a6fe125SMel Gorman return -ENOMEM; 40105a6fe125SMel Gorman 401117c9d12eSMel Gorman chg = to - from; 401217c9d12eSMel Gorman 40135a6fe125SMel Gorman set_vma_resv_map(vma, resv_map); 40145a6fe125SMel Gorman set_vma_resv_flags(vma, HPAGE_RESV_OWNER); 40155a6fe125SMel Gorman } 40165a6fe125SMel Gorman 4017c50ac050SDave Hansen if (chg < 0) { 4018c50ac050SDave Hansen ret = chg; 4019c50ac050SDave Hansen goto out_err; 4020c50ac050SDave Hansen } 402117c9d12eSMel Gorman 40221c5ecae3SMike Kravetz /* 40231c5ecae3SMike Kravetz * There must be enough pages in the subpool for the mapping. If 40241c5ecae3SMike Kravetz * the subpool has a minimum size, there may be some global 40251c5ecae3SMike Kravetz * reservations already in place (gbl_reserve). 40261c5ecae3SMike Kravetz */ 40271c5ecae3SMike Kravetz gbl_reserve = hugepage_subpool_get_pages(spool, chg); 40281c5ecae3SMike Kravetz if (gbl_reserve < 0) { 4029c50ac050SDave Hansen ret = -ENOSPC; 4030c50ac050SDave Hansen goto out_err; 4031c50ac050SDave Hansen } 403217c9d12eSMel Gorman 403317c9d12eSMel Gorman /* 403417c9d12eSMel Gorman * Check enough hugepages are available for the reservation. 403590481622SDavid Gibson * Hand the pages back to the subpool if there are not 403617c9d12eSMel Gorman */ 40371c5ecae3SMike Kravetz ret = hugetlb_acct_memory(h, gbl_reserve); 403817c9d12eSMel Gorman if (ret < 0) { 40391c5ecae3SMike Kravetz /* put back original number of pages, chg */ 40401c5ecae3SMike Kravetz (void)hugepage_subpool_put_pages(spool, chg); 4041c50ac050SDave Hansen goto out_err; 404217c9d12eSMel Gorman } 404317c9d12eSMel Gorman 404417c9d12eSMel Gorman /* 404517c9d12eSMel Gorman * Account for the reservations made. Shared mappings record regions 404617c9d12eSMel Gorman * that have reservations as they are shared by multiple VMAs. 404717c9d12eSMel Gorman * When the last VMA disappears, the region map says how much 404817c9d12eSMel Gorman * the reservation was and the page cache tells how much of 404917c9d12eSMel Gorman * the reservation was consumed. Private mappings are per-VMA and 405017c9d12eSMel Gorman * only the consumed reservations are tracked. When the VMA 405117c9d12eSMel Gorman * disappears, the original reservation is the VMA size and the 405217c9d12eSMel Gorman * consumed reservations are stored in the map. Hence, nothing 405317c9d12eSMel Gorman * else has to be done for private mappings here 405417c9d12eSMel Gorman */ 405533039678SMike Kravetz if (!vma || vma->vm_flags & VM_MAYSHARE) { 405633039678SMike Kravetz long add = region_add(resv_map, from, to); 405733039678SMike Kravetz 405833039678SMike Kravetz if (unlikely(chg > add)) { 405933039678SMike Kravetz /* 406033039678SMike Kravetz * pages in this range were added to the reserve 406133039678SMike Kravetz * map between region_chg and region_add. This 406233039678SMike Kravetz * indicates a race with alloc_huge_page. Adjust 406333039678SMike Kravetz * the subpool and reserve counts modified above 406433039678SMike Kravetz * based on the difference. 406533039678SMike Kravetz */ 406633039678SMike Kravetz long rsv_adjust; 406733039678SMike Kravetz 406833039678SMike Kravetz rsv_adjust = hugepage_subpool_put_pages(spool, 406933039678SMike Kravetz chg - add); 407033039678SMike Kravetz hugetlb_acct_memory(h, -rsv_adjust); 407133039678SMike Kravetz } 407233039678SMike Kravetz } 4073a43a8c39SChen, Kenneth W return 0; 4074c50ac050SDave Hansen out_err: 40755e911373SMike Kravetz if (!vma || vma->vm_flags & VM_MAYSHARE) 40765e911373SMike Kravetz region_abort(resv_map, from, to); 4077f031dd27SJoonsoo Kim if (vma && is_vma_resv_set(vma, HPAGE_RESV_OWNER)) 4078f031dd27SJoonsoo Kim kref_put(&resv_map->refs, resv_map_release); 4079c50ac050SDave Hansen return ret; 4080a43a8c39SChen, Kenneth W } 4081a43a8c39SChen, Kenneth W 4082b5cec28dSMike Kravetz long hugetlb_unreserve_pages(struct inode *inode, long start, long end, 4083b5cec28dSMike Kravetz long freed) 4084a43a8c39SChen, Kenneth W { 4085a5516438SAndi Kleen struct hstate *h = hstate_inode(inode); 40864e35f483SJoonsoo Kim struct resv_map *resv_map = inode_resv_map(inode); 40879119a41eSJoonsoo Kim long chg = 0; 408890481622SDavid Gibson struct hugepage_subpool *spool = subpool_inode(inode); 40891c5ecae3SMike Kravetz long gbl_reserve; 409045c682a6SKen Chen 4091b5cec28dSMike Kravetz if (resv_map) { 4092b5cec28dSMike Kravetz chg = region_del(resv_map, start, end); 4093b5cec28dSMike Kravetz /* 4094b5cec28dSMike Kravetz * region_del() can fail in the rare case where a region 4095b5cec28dSMike Kravetz * must be split and another region descriptor can not be 4096b5cec28dSMike Kravetz * allocated. If end == LONG_MAX, it will not fail. 4097b5cec28dSMike Kravetz */ 4098b5cec28dSMike Kravetz if (chg < 0) 4099b5cec28dSMike Kravetz return chg; 4100b5cec28dSMike Kravetz } 4101b5cec28dSMike Kravetz 410245c682a6SKen Chen spin_lock(&inode->i_lock); 4103e4c6f8beSEric Sandeen inode->i_blocks -= (blocks_per_huge_page(h) * freed); 410445c682a6SKen Chen spin_unlock(&inode->i_lock); 410545c682a6SKen Chen 41061c5ecae3SMike Kravetz /* 41071c5ecae3SMike Kravetz * If the subpool has a minimum size, the number of global 41081c5ecae3SMike Kravetz * reservations to be released may be adjusted. 41091c5ecae3SMike Kravetz */ 41101c5ecae3SMike Kravetz gbl_reserve = hugepage_subpool_put_pages(spool, (chg - freed)); 41111c5ecae3SMike Kravetz hugetlb_acct_memory(h, -gbl_reserve); 4112b5cec28dSMike Kravetz 4113b5cec28dSMike Kravetz return 0; 4114a43a8c39SChen, Kenneth W } 411593f70f90SNaoya Horiguchi 41163212b535SSteve Capper #ifdef CONFIG_ARCH_WANT_HUGE_PMD_SHARE 41173212b535SSteve Capper static unsigned long page_table_shareable(struct vm_area_struct *svma, 41183212b535SSteve Capper struct vm_area_struct *vma, 41193212b535SSteve Capper unsigned long addr, pgoff_t idx) 41203212b535SSteve Capper { 41213212b535SSteve Capper unsigned long saddr = ((idx - svma->vm_pgoff) << PAGE_SHIFT) + 41223212b535SSteve Capper svma->vm_start; 41233212b535SSteve Capper unsigned long sbase = saddr & PUD_MASK; 41243212b535SSteve Capper unsigned long s_end = sbase + PUD_SIZE; 41253212b535SSteve Capper 41263212b535SSteve Capper /* Allow segments to share if only one is marked locked */ 4127de60f5f1SEric B Munson unsigned long vm_flags = vma->vm_flags & VM_LOCKED_CLEAR_MASK; 4128de60f5f1SEric B Munson unsigned long svm_flags = svma->vm_flags & VM_LOCKED_CLEAR_MASK; 41293212b535SSteve Capper 41303212b535SSteve Capper /* 41313212b535SSteve Capper * match the virtual addresses, permission and the alignment of the 41323212b535SSteve Capper * page table page. 41333212b535SSteve Capper */ 41343212b535SSteve Capper if (pmd_index(addr) != pmd_index(saddr) || 41353212b535SSteve Capper vm_flags != svm_flags || 41363212b535SSteve Capper sbase < svma->vm_start || svma->vm_end < s_end) 41373212b535SSteve Capper return 0; 41383212b535SSteve Capper 41393212b535SSteve Capper return saddr; 41403212b535SSteve Capper } 41413212b535SSteve Capper 414231aafb45SNicholas Krause static bool vma_shareable(struct vm_area_struct *vma, unsigned long addr) 41433212b535SSteve Capper { 41443212b535SSteve Capper unsigned long base = addr & PUD_MASK; 41453212b535SSteve Capper unsigned long end = base + PUD_SIZE; 41463212b535SSteve Capper 41473212b535SSteve Capper /* 41483212b535SSteve Capper * check on proper vm_flags and page table alignment 41493212b535SSteve Capper */ 41503212b535SSteve Capper if (vma->vm_flags & VM_MAYSHARE && 41513212b535SSteve Capper vma->vm_start <= base && end <= vma->vm_end) 415231aafb45SNicholas Krause return true; 415331aafb45SNicholas Krause return false; 41543212b535SSteve Capper } 41553212b535SSteve Capper 41563212b535SSteve Capper /* 41573212b535SSteve Capper * Search for a shareable pmd page for hugetlb. In any case calls pmd_alloc() 41583212b535SSteve Capper * and returns the corresponding pte. While this is not necessary for the 41593212b535SSteve Capper * !shared pmd case because we can allocate the pmd later as well, it makes the 41603212b535SSteve Capper * code much cleaner. pmd allocation is essential for the shared case because 4161c8c06efaSDavidlohr Bueso * pud has to be populated inside the same i_mmap_rwsem section - otherwise 41623212b535SSteve Capper * racing tasks could either miss the sharing (see huge_pte_offset) or select a 41633212b535SSteve Capper * bad pmd for sharing. 41643212b535SSteve Capper */ 41653212b535SSteve Capper pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud) 41663212b535SSteve Capper { 41673212b535SSteve Capper struct vm_area_struct *vma = find_vma(mm, addr); 41683212b535SSteve Capper struct address_space *mapping = vma->vm_file->f_mapping; 41693212b535SSteve Capper pgoff_t idx = ((addr - vma->vm_start) >> PAGE_SHIFT) + 41703212b535SSteve Capper vma->vm_pgoff; 41713212b535SSteve Capper struct vm_area_struct *svma; 41723212b535SSteve Capper unsigned long saddr; 41733212b535SSteve Capper pte_t *spte = NULL; 41743212b535SSteve Capper pte_t *pte; 4175cb900f41SKirill A. Shutemov spinlock_t *ptl; 41763212b535SSteve Capper 41773212b535SSteve Capper if (!vma_shareable(vma, addr)) 41783212b535SSteve Capper return (pte_t *)pmd_alloc(mm, pud, addr); 41793212b535SSteve Capper 418083cde9e8SDavidlohr Bueso i_mmap_lock_write(mapping); 41813212b535SSteve Capper vma_interval_tree_foreach(svma, &mapping->i_mmap, idx, idx) { 41823212b535SSteve Capper if (svma == vma) 41833212b535SSteve Capper continue; 41843212b535SSteve Capper 41853212b535SSteve Capper saddr = page_table_shareable(svma, vma, addr, idx); 41863212b535SSteve Capper if (saddr) { 41873212b535SSteve Capper spte = huge_pte_offset(svma->vm_mm, saddr); 41883212b535SSteve Capper if (spte) { 4189dc6c9a35SKirill A. Shutemov mm_inc_nr_pmds(mm); 41903212b535SSteve Capper get_page(virt_to_page(spte)); 41913212b535SSteve Capper break; 41923212b535SSteve Capper } 41933212b535SSteve Capper } 41943212b535SSteve Capper } 41953212b535SSteve Capper 41963212b535SSteve Capper if (!spte) 41973212b535SSteve Capper goto out; 41983212b535SSteve Capper 4199cb900f41SKirill A. Shutemov ptl = huge_pte_lockptr(hstate_vma(vma), mm, spte); 4200cb900f41SKirill A. Shutemov spin_lock(ptl); 4201dc6c9a35SKirill A. Shutemov if (pud_none(*pud)) { 42023212b535SSteve Capper pud_populate(mm, pud, 42033212b535SSteve Capper (pmd_t *)((unsigned long)spte & PAGE_MASK)); 4204dc6c9a35SKirill A. Shutemov } else { 42053212b535SSteve Capper put_page(virt_to_page(spte)); 4206dc6c9a35SKirill A. Shutemov mm_inc_nr_pmds(mm); 4207dc6c9a35SKirill A. Shutemov } 4208cb900f41SKirill A. Shutemov spin_unlock(ptl); 42093212b535SSteve Capper out: 42103212b535SSteve Capper pte = (pte_t *)pmd_alloc(mm, pud, addr); 421183cde9e8SDavidlohr Bueso i_mmap_unlock_write(mapping); 42123212b535SSteve Capper return pte; 42133212b535SSteve Capper } 42143212b535SSteve Capper 42153212b535SSteve Capper /* 42163212b535SSteve Capper * unmap huge page backed by shared pte. 42173212b535SSteve Capper * 42183212b535SSteve Capper * Hugetlb pte page is ref counted at the time of mapping. If pte is shared 42193212b535SSteve Capper * indicated by page_count > 1, unmap is achieved by clearing pud and 42203212b535SSteve Capper * decrementing the ref count. If count == 1, the pte page is not shared. 42213212b535SSteve Capper * 4222cb900f41SKirill A. Shutemov * called with page table lock held. 42233212b535SSteve Capper * 42243212b535SSteve Capper * returns: 1 successfully unmapped a shared pte page 42253212b535SSteve Capper * 0 the underlying pte page is not shared, or it is the last user 42263212b535SSteve Capper */ 42273212b535SSteve Capper int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep) 42283212b535SSteve Capper { 42293212b535SSteve Capper pgd_t *pgd = pgd_offset(mm, *addr); 42303212b535SSteve Capper pud_t *pud = pud_offset(pgd, *addr); 42313212b535SSteve Capper 42323212b535SSteve Capper BUG_ON(page_count(virt_to_page(ptep)) == 0); 42333212b535SSteve Capper if (page_count(virt_to_page(ptep)) == 1) 42343212b535SSteve Capper return 0; 42353212b535SSteve Capper 42363212b535SSteve Capper pud_clear(pud); 42373212b535SSteve Capper put_page(virt_to_page(ptep)); 4238dc6c9a35SKirill A. Shutemov mm_dec_nr_pmds(mm); 42393212b535SSteve Capper *addr = ALIGN(*addr, HPAGE_SIZE * PTRS_PER_PTE) - HPAGE_SIZE; 42403212b535SSteve Capper return 1; 42413212b535SSteve Capper } 42429e5fc74cSSteve Capper #define want_pmd_share() (1) 42439e5fc74cSSteve Capper #else /* !CONFIG_ARCH_WANT_HUGE_PMD_SHARE */ 42449e5fc74cSSteve Capper pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud) 42459e5fc74cSSteve Capper { 42469e5fc74cSSteve Capper return NULL; 42479e5fc74cSSteve Capper } 4248e81f2d22SZhang Zhen 4249e81f2d22SZhang Zhen int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep) 4250e81f2d22SZhang Zhen { 4251e81f2d22SZhang Zhen return 0; 4252e81f2d22SZhang Zhen } 42539e5fc74cSSteve Capper #define want_pmd_share() (0) 42543212b535SSteve Capper #endif /* CONFIG_ARCH_WANT_HUGE_PMD_SHARE */ 42553212b535SSteve Capper 42569e5fc74cSSteve Capper #ifdef CONFIG_ARCH_WANT_GENERAL_HUGETLB 42579e5fc74cSSteve Capper pte_t *huge_pte_alloc(struct mm_struct *mm, 42589e5fc74cSSteve Capper unsigned long addr, unsigned long sz) 42599e5fc74cSSteve Capper { 42609e5fc74cSSteve Capper pgd_t *pgd; 42619e5fc74cSSteve Capper pud_t *pud; 42629e5fc74cSSteve Capper pte_t *pte = NULL; 42639e5fc74cSSteve Capper 42649e5fc74cSSteve Capper pgd = pgd_offset(mm, addr); 42659e5fc74cSSteve Capper pud = pud_alloc(mm, pgd, addr); 42669e5fc74cSSteve Capper if (pud) { 42679e5fc74cSSteve Capper if (sz == PUD_SIZE) { 42689e5fc74cSSteve Capper pte = (pte_t *)pud; 42699e5fc74cSSteve Capper } else { 42709e5fc74cSSteve Capper BUG_ON(sz != PMD_SIZE); 42719e5fc74cSSteve Capper if (want_pmd_share() && pud_none(*pud)) 42729e5fc74cSSteve Capper pte = huge_pmd_share(mm, addr, pud); 42739e5fc74cSSteve Capper else 42749e5fc74cSSteve Capper pte = (pte_t *)pmd_alloc(mm, pud, addr); 42759e5fc74cSSteve Capper } 42769e5fc74cSSteve Capper } 42779e5fc74cSSteve Capper BUG_ON(pte && !pte_none(*pte) && !pte_huge(*pte)); 42789e5fc74cSSteve Capper 42799e5fc74cSSteve Capper return pte; 42809e5fc74cSSteve Capper } 42819e5fc74cSSteve Capper 42829e5fc74cSSteve Capper pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr) 42839e5fc74cSSteve Capper { 42849e5fc74cSSteve Capper pgd_t *pgd; 42859e5fc74cSSteve Capper pud_t *pud; 42869e5fc74cSSteve Capper pmd_t *pmd = NULL; 42879e5fc74cSSteve Capper 42889e5fc74cSSteve Capper pgd = pgd_offset(mm, addr); 42899e5fc74cSSteve Capper if (pgd_present(*pgd)) { 42909e5fc74cSSteve Capper pud = pud_offset(pgd, addr); 42919e5fc74cSSteve Capper if (pud_present(*pud)) { 42929e5fc74cSSteve Capper if (pud_huge(*pud)) 42939e5fc74cSSteve Capper return (pte_t *)pud; 42949e5fc74cSSteve Capper pmd = pmd_offset(pud, addr); 42959e5fc74cSSteve Capper } 42969e5fc74cSSteve Capper } 42979e5fc74cSSteve Capper return (pte_t *) pmd; 42989e5fc74cSSteve Capper } 42999e5fc74cSSteve Capper 430061f77edaSNaoya Horiguchi #endif /* CONFIG_ARCH_WANT_GENERAL_HUGETLB */ 430161f77edaSNaoya Horiguchi 430261f77edaSNaoya Horiguchi /* 430361f77edaSNaoya Horiguchi * These functions are overwritable if your architecture needs its own 430461f77edaSNaoya Horiguchi * behavior. 430561f77edaSNaoya Horiguchi */ 430661f77edaSNaoya Horiguchi struct page * __weak 430761f77edaSNaoya Horiguchi follow_huge_addr(struct mm_struct *mm, unsigned long address, 430861f77edaSNaoya Horiguchi int write) 430961f77edaSNaoya Horiguchi { 431061f77edaSNaoya Horiguchi return ERR_PTR(-EINVAL); 431161f77edaSNaoya Horiguchi } 431261f77edaSNaoya Horiguchi 431361f77edaSNaoya Horiguchi struct page * __weak 43149e5fc74cSSteve Capper follow_huge_pmd(struct mm_struct *mm, unsigned long address, 4315e66f17ffSNaoya Horiguchi pmd_t *pmd, int flags) 43169e5fc74cSSteve Capper { 4317e66f17ffSNaoya Horiguchi struct page *page = NULL; 4318e66f17ffSNaoya Horiguchi spinlock_t *ptl; 4319e66f17ffSNaoya Horiguchi retry: 4320e66f17ffSNaoya Horiguchi ptl = pmd_lockptr(mm, pmd); 4321e66f17ffSNaoya Horiguchi spin_lock(ptl); 4322e66f17ffSNaoya Horiguchi /* 4323e66f17ffSNaoya Horiguchi * make sure that the address range covered by this pmd is not 4324e66f17ffSNaoya Horiguchi * unmapped from other threads. 4325e66f17ffSNaoya Horiguchi */ 4326e66f17ffSNaoya Horiguchi if (!pmd_huge(*pmd)) 4327e66f17ffSNaoya Horiguchi goto out; 4328e66f17ffSNaoya Horiguchi if (pmd_present(*pmd)) { 432997534127SGerald Schaefer page = pmd_page(*pmd) + ((address & ~PMD_MASK) >> PAGE_SHIFT); 4330e66f17ffSNaoya Horiguchi if (flags & FOLL_GET) 4331e66f17ffSNaoya Horiguchi get_page(page); 4332e66f17ffSNaoya Horiguchi } else { 4333e66f17ffSNaoya Horiguchi if (is_hugetlb_entry_migration(huge_ptep_get((pte_t *)pmd))) { 4334e66f17ffSNaoya Horiguchi spin_unlock(ptl); 4335e66f17ffSNaoya Horiguchi __migration_entry_wait(mm, (pte_t *)pmd, ptl); 4336e66f17ffSNaoya Horiguchi goto retry; 4337e66f17ffSNaoya Horiguchi } 4338e66f17ffSNaoya Horiguchi /* 4339e66f17ffSNaoya Horiguchi * hwpoisoned entry is treated as no_page_table in 4340e66f17ffSNaoya Horiguchi * follow_page_mask(). 4341e66f17ffSNaoya Horiguchi */ 4342e66f17ffSNaoya Horiguchi } 4343e66f17ffSNaoya Horiguchi out: 4344e66f17ffSNaoya Horiguchi spin_unlock(ptl); 43459e5fc74cSSteve Capper return page; 43469e5fc74cSSteve Capper } 43479e5fc74cSSteve Capper 434861f77edaSNaoya Horiguchi struct page * __weak 43499e5fc74cSSteve Capper follow_huge_pud(struct mm_struct *mm, unsigned long address, 4350e66f17ffSNaoya Horiguchi pud_t *pud, int flags) 43519e5fc74cSSteve Capper { 4352e66f17ffSNaoya Horiguchi if (flags & FOLL_GET) 4353e66f17ffSNaoya Horiguchi return NULL; 43549e5fc74cSSteve Capper 4355e66f17ffSNaoya Horiguchi return pte_page(*(pte_t *)pud) + ((address & ~PUD_MASK) >> PAGE_SHIFT); 43569e5fc74cSSteve Capper } 43579e5fc74cSSteve Capper 4358d5bd9106SAndi Kleen #ifdef CONFIG_MEMORY_FAILURE 4359d5bd9106SAndi Kleen 436093f70f90SNaoya Horiguchi /* 436193f70f90SNaoya Horiguchi * This function is called from memory failure code. 436293f70f90SNaoya Horiguchi * Assume the caller holds page lock of the head page. 436393f70f90SNaoya Horiguchi */ 43646de2b1aaSNaoya Horiguchi int dequeue_hwpoisoned_huge_page(struct page *hpage) 436593f70f90SNaoya Horiguchi { 436693f70f90SNaoya Horiguchi struct hstate *h = page_hstate(hpage); 436793f70f90SNaoya Horiguchi int nid = page_to_nid(hpage); 43686de2b1aaSNaoya Horiguchi int ret = -EBUSY; 436993f70f90SNaoya Horiguchi 437093f70f90SNaoya Horiguchi spin_lock(&hugetlb_lock); 43717e1f049eSNaoya Horiguchi /* 43727e1f049eSNaoya Horiguchi * Just checking !page_huge_active is not enough, because that could be 43737e1f049eSNaoya Horiguchi * an isolated/hwpoisoned hugepage (which have >0 refcount). 43747e1f049eSNaoya Horiguchi */ 43757e1f049eSNaoya Horiguchi if (!page_huge_active(hpage) && !page_count(hpage)) { 437656f2fb14SNaoya Horiguchi /* 437756f2fb14SNaoya Horiguchi * Hwpoisoned hugepage isn't linked to activelist or freelist, 437856f2fb14SNaoya Horiguchi * but dangling hpage->lru can trigger list-debug warnings 437956f2fb14SNaoya Horiguchi * (this happens when we call unpoison_memory() on it), 438056f2fb14SNaoya Horiguchi * so let it point to itself with list_del_init(). 438156f2fb14SNaoya Horiguchi */ 438256f2fb14SNaoya Horiguchi list_del_init(&hpage->lru); 43838c6c2ecbSNaoya Horiguchi set_page_refcounted(hpage); 438493f70f90SNaoya Horiguchi h->free_huge_pages--; 438593f70f90SNaoya Horiguchi h->free_huge_pages_node[nid]--; 43866de2b1aaSNaoya Horiguchi ret = 0; 438793f70f90SNaoya Horiguchi } 43886de2b1aaSNaoya Horiguchi spin_unlock(&hugetlb_lock); 43896de2b1aaSNaoya Horiguchi return ret; 43906de2b1aaSNaoya Horiguchi } 43916de2b1aaSNaoya Horiguchi #endif 439231caf665SNaoya Horiguchi 439331caf665SNaoya Horiguchi bool isolate_huge_page(struct page *page, struct list_head *list) 439431caf665SNaoya Horiguchi { 4395bcc54222SNaoya Horiguchi bool ret = true; 4396bcc54222SNaoya Horiguchi 4397309381feSSasha Levin VM_BUG_ON_PAGE(!PageHead(page), page); 439831caf665SNaoya Horiguchi spin_lock(&hugetlb_lock); 4399bcc54222SNaoya Horiguchi if (!page_huge_active(page) || !get_page_unless_zero(page)) { 4400bcc54222SNaoya Horiguchi ret = false; 4401bcc54222SNaoya Horiguchi goto unlock; 4402bcc54222SNaoya Horiguchi } 4403bcc54222SNaoya Horiguchi clear_page_huge_active(page); 440431caf665SNaoya Horiguchi list_move_tail(&page->lru, list); 4405bcc54222SNaoya Horiguchi unlock: 440631caf665SNaoya Horiguchi spin_unlock(&hugetlb_lock); 4407bcc54222SNaoya Horiguchi return ret; 440831caf665SNaoya Horiguchi } 440931caf665SNaoya Horiguchi 441031caf665SNaoya Horiguchi void putback_active_hugepage(struct page *page) 441131caf665SNaoya Horiguchi { 4412309381feSSasha Levin VM_BUG_ON_PAGE(!PageHead(page), page); 441331caf665SNaoya Horiguchi spin_lock(&hugetlb_lock); 4414bcc54222SNaoya Horiguchi set_page_huge_active(page); 441531caf665SNaoya Horiguchi list_move_tail(&page->lru, &(page_hstate(page))->hugepage_activelist); 441631caf665SNaoya Horiguchi spin_unlock(&hugetlb_lock); 441731caf665SNaoya Horiguchi put_page(page); 441831caf665SNaoya Horiguchi } 4419