1b2441318SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0 21da177e4SLinus Torvalds /* 31da177e4SLinus Torvalds * S390 version 4a53c8fabSHeiko Carstens * Copyright IBM Corp. 1999 51da177e4SLinus Torvalds * Author(s): Hartmut Penner (hp@de.ibm.com) 61da177e4SLinus Torvalds * 71da177e4SLinus Torvalds * Derived from "arch/i386/mm/init.c" 81da177e4SLinus Torvalds * Copyright (C) 1995 Linus Torvalds 91da177e4SLinus Torvalds */ 101da177e4SLinus Torvalds 111da177e4SLinus Torvalds #include <linux/signal.h> 121da177e4SLinus Torvalds #include <linux/sched.h> 131da177e4SLinus Torvalds #include <linux/kernel.h> 141da177e4SLinus Torvalds #include <linux/errno.h> 151da177e4SLinus Torvalds #include <linux/string.h> 161da177e4SLinus Torvalds #include <linux/types.h> 171da177e4SLinus Torvalds #include <linux/ptrace.h> 181da177e4SLinus Torvalds #include <linux/mman.h> 191da177e4SLinus Torvalds #include <linux/mm.h> 201da177e4SLinus Torvalds #include <linux/swap.h> 2164e1f0c5SHalil Pasic #include <linux/swiotlb.h> 221da177e4SLinus Torvalds #include <linux/smp.h> 231da177e4SLinus Torvalds #include <linux/init.h> 241da177e4SLinus Torvalds #include <linux/pagemap.h> 2557c8a661SMike Rapoport #include <linux/memblock.h> 26e5d709bbSHeiko Carstens #include <linux/memory.h> 27d882b172SHeiko Carstens #include <linux/pfn.h> 28028d9b3cSHeiko Carstens #include <linux/poison.h> 292b67fc46SHeiko Carstens #include <linux/initrd.h> 303a4c5d59SHeiko Carstens #include <linux/export.h> 3134ad7cdcSHeiko Carstens #include <linux/cma.h> 325a0e3ad6STejun Heo #include <linux/gfp.h> 339087c375STom Lendacky #include <linux/dma-direct.h> 341da177e4SLinus Torvalds #include <asm/processor.h> 357c0f6ba6SLinus Torvalds #include <linux/uaccess.h> 361da177e4SLinus Torvalds #include <asm/pgalloc.h> 37e41ba111SSven Schnelle #include <asm/kfence.h> 3808c8e685SHeiko Carstens #include <asm/ptdump.h> 391da177e4SLinus Torvalds #include <asm/dma.h> 404df29d2bSAlexander Gordeev #include <asm/abs_lowcore.h> 411da177e4SLinus Torvalds #include <asm/tlb.h> 421da177e4SLinus Torvalds #include <asm/tlbflush.h> 43d882b172SHeiko Carstens #include <asm/sections.h> 44a0616cdeSDavid Howells #include <asm/ctl_reg.h> 45e5d709bbSHeiko Carstens #include <asm/sclp.h> 46e6c7c630SLaura Abbott #include <asm/set_memory.h> 4742db5ed8SVasily Gorbik #include <asm/kasan.h> 4864e1f0c5SHalil Pasic #include <asm/dma-mapping.h> 4964e1f0c5SHalil Pasic #include <asm/uv.h> 50a603002eSJuergen Gross #include <linux/virtio_anchor.h> 514ce1cf7bSPierre Morel #include <linux/virtio_config.h> 521da177e4SLinus Torvalds 5333def849SJoe Perches pgd_t swapper_pg_dir[PTRS_PER_PGD] __section(".bss..swapper_pg_dir"); 540290c9e3SHeiko Carstens static pgd_t invalid_pg_dir[PTRS_PER_PGD] __section(".bss..invalid_pg_dir"); 550290c9e3SHeiko Carstens 560290c9e3SHeiko Carstens unsigned long s390_invalid_asce; 571485c5c8SHeiko Carstens 58238ec4efSMartin Schwidefsky unsigned long empty_zero_page, zero_page_mask; 591485c5c8SHeiko Carstens EXPORT_SYMBOL(empty_zero_page); 600b70068eSArd Biesheuvel EXPORT_SYMBOL(zero_page_mask); 611da177e4SLinus Torvalds 620999f119SJiang Liu static void __init setup_zero_pages(void) 63238ec4efSMartin Schwidefsky { 64238ec4efSMartin Schwidefsky unsigned int order; 65238ec4efSMartin Schwidefsky struct page *page; 66238ec4efSMartin Schwidefsky int i; 67238ec4efSMartin Schwidefsky 68c7e8b2c2SMartin Schwidefsky /* Latest machines require a mapping granularity of 512KB */ 691f6b83e5SMartin Schwidefsky order = 7; 70c7e8b2c2SMartin Schwidefsky 717919e91bSMartin Schwidefsky /* Limit number of empty zero pages for small memory sizes */ 72ca79b0c2SArun KS while (order > 2 && (totalram_pages() >> 10) < (1UL << order)) 731f6b83e5SMartin Schwidefsky order--; 74238ec4efSMartin Schwidefsky 75238ec4efSMartin Schwidefsky empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order); 76238ec4efSMartin Schwidefsky if (!empty_zero_page) 77238ec4efSMartin Schwidefsky panic("Out of memory in setup_zero_pages"); 78238ec4efSMartin Schwidefsky 79238ec4efSMartin Schwidefsky page = virt_to_page((void *) empty_zero_page); 80238ec4efSMartin Schwidefsky split_page(page, order); 81238ec4efSMartin Schwidefsky for (i = 1 << order; i > 0; i--) { 820999f119SJiang Liu mark_page_reserved(page); 83238ec4efSMartin Schwidefsky page++; 84238ec4efSMartin Schwidefsky } 85238ec4efSMartin Schwidefsky 860999f119SJiang Liu zero_page_mask = ((PAGE_SIZE << order) - 1) & PAGE_MASK; 87238ec4efSMartin Schwidefsky } 88238ec4efSMartin Schwidefsky 891da177e4SLinus Torvalds /* 901da177e4SLinus Torvalds * paging_init() sets up the page tables 911da177e4SLinus Torvalds */ 921da177e4SLinus Torvalds void __init paging_init(void) 931da177e4SLinus Torvalds { 9439b742f9SHeiko Carstens unsigned long max_zone_pfns[MAX_NR_ZONES]; 9514045ebfSMartin Schwidefsky unsigned long pgd_type, asce_bits; 9660c49701SHeiko Carstens psw_t psw; 971da177e4SLinus Torvalds 980290c9e3SHeiko Carstens s390_invalid_asce = (unsigned long)invalid_pg_dir; 990290c9e3SHeiko Carstens s390_invalid_asce |= _ASCE_TYPE_REGION3 | _ASCE_TABLE_LENGTH; 1000290c9e3SHeiko Carstens crst_table_init((unsigned long *)invalid_pg_dir, _REGION3_ENTRY_EMPTY); 1013610cce8SMartin Schwidefsky init_mm.pgd = swapper_pg_dir; 102f1c1174fSHeiko Carstens if (VMALLOC_END > _REGION2_SIZE) { 10314045ebfSMartin Schwidefsky asce_bits = _ASCE_TYPE_REGION2 | _ASCE_TABLE_LENGTH; 10414045ebfSMartin Schwidefsky pgd_type = _REGION2_ENTRY_EMPTY; 10514045ebfSMartin Schwidefsky } else { 10614045ebfSMartin Schwidefsky asce_bits = _ASCE_TYPE_REGION3 | _ASCE_TABLE_LENGTH; 1076252d702SMartin Schwidefsky pgd_type = _REGION3_ENTRY_EMPTY; 10814045ebfSMartin Schwidefsky } 109723cacbdSGerald Schaefer init_mm.context.asce = (__pa(init_mm.pgd) & PAGE_MASK) | asce_bits; 110723cacbdSGerald Schaefer S390_lowcore.kernel_asce = init_mm.context.asce; 1110290c9e3SHeiko Carstens S390_lowcore.user_asce = s390_invalid_asce; 112f1c1174fSHeiko Carstens crst_table_init((unsigned long *) init_mm.pgd, pgd_type); 113f4eb07c1SHeiko Carstens vmem_map_init(); 11454b52981SVasily Gorbik kasan_copy_shadow_mapping(); 1151da177e4SLinus Torvalds 1161da177e4SLinus Torvalds /* enable virtual mapping in kernel mode */ 1173610cce8SMartin Schwidefsky __ctl_load(S390_lowcore.kernel_asce, 1, 1); 1180290c9e3SHeiko Carstens __ctl_load(S390_lowcore.user_asce, 7, 7); 1193610cce8SMartin Schwidefsky __ctl_load(S390_lowcore.kernel_asce, 13, 13); 12060c49701SHeiko Carstens psw.mask = __extract_psw(); 121a7525982SHeiko Carstens psw_bits(psw).dat = 1; 1228bb3fdd6SHeiko Carstens psw_bits(psw).as = PSW_BITS_AS_HOME; 12360c49701SHeiko Carstens __load_psw_mask(psw.mask); 124135ff163SVasily Gorbik kasan_free_early_identity(); 1251da177e4SLinus Torvalds 12617f34580SHeiko Carstens sparse_init(); 1278b5369eaSNicolas Saenz Julienne zone_dma_bits = 31; 12839b742f9SHeiko Carstens memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); 12939b742f9SHeiko Carstens max_zone_pfns[ZONE_DMA] = PFN_DOWN(MAX_DMA_ADDRESS); 13039b742f9SHeiko Carstens max_zone_pfns[ZONE_NORMAL] = max_low_pfn; 1319691a071SMike Rapoport free_area_init(max_zone_pfns); 1321da177e4SLinus Torvalds } 1331da177e4SLinus Torvalds 13491d37211SHeiko Carstens void mark_rodata_ro(void) 13591d37211SHeiko Carstens { 136d07a980cSHeiko Carstens unsigned long size = __end_ro_after_init - __start_ro_after_init; 137d07a980cSHeiko Carstens 138d07a980cSHeiko Carstens set_memory_ro((unsigned long)__start_ro_after_init, size >> PAGE_SHIFT); 139d07a980cSHeiko Carstens pr_info("Write protected read-only-after-init data: %luk\n", size >> 10); 14008c8e685SHeiko Carstens debug_checkwx(); 14191d37211SHeiko Carstens } 14291d37211SHeiko Carstens 143*58635d66SNico Boehr int set_memory_encrypted(unsigned long vaddr, int numpages) 14464e1f0c5SHalil Pasic { 14564e1f0c5SHalil Pasic int i; 14664e1f0c5SHalil Pasic 14764e1f0c5SHalil Pasic /* make specified pages unshared, (swiotlb, dma_free) */ 14864e1f0c5SHalil Pasic for (i = 0; i < numpages; ++i) { 149*58635d66SNico Boehr uv_remove_shared(virt_to_phys((void *)vaddr)); 150*58635d66SNico Boehr vaddr += PAGE_SIZE; 15164e1f0c5SHalil Pasic } 15264e1f0c5SHalil Pasic return 0; 15364e1f0c5SHalil Pasic } 15464e1f0c5SHalil Pasic 155*58635d66SNico Boehr int set_memory_decrypted(unsigned long vaddr, int numpages) 15664e1f0c5SHalil Pasic { 15764e1f0c5SHalil Pasic int i; 15864e1f0c5SHalil Pasic /* make specified pages shared (swiotlb, dma_alloca) */ 15964e1f0c5SHalil Pasic for (i = 0; i < numpages; ++i) { 160*58635d66SNico Boehr uv_set_shared(virt_to_phys((void *)vaddr)); 161*58635d66SNico Boehr vaddr += PAGE_SIZE; 16264e1f0c5SHalil Pasic } 16364e1f0c5SHalil Pasic return 0; 16464e1f0c5SHalil Pasic } 16564e1f0c5SHalil Pasic 16664e1f0c5SHalil Pasic /* are we a protected virtualization guest? */ 1679087c375STom Lendacky bool force_dma_unencrypted(struct device *dev) 1689087c375STom Lendacky { 1695cbdaeefSThiago Jung Bauermann return is_prot_virt_guest(); 1709087c375STom Lendacky } 1719087c375STom Lendacky 17264e1f0c5SHalil Pasic /* protected virtualization */ 17364e1f0c5SHalil Pasic static void pv_init(void) 17464e1f0c5SHalil Pasic { 17564e1f0c5SHalil Pasic if (!is_prot_virt_guest()) 17664e1f0c5SHalil Pasic return; 17764e1f0c5SHalil Pasic 178a603002eSJuergen Gross virtio_set_mem_acc_cb(virtio_require_restricted_mem_acc); 1793f9dfbebSJuergen Gross 18064e1f0c5SHalil Pasic /* make sure bounce buffers are shared */ 181c6af2aa9SChristoph Hellwig swiotlb_init(true, SWIOTLB_FORCE | SWIOTLB_VERBOSE); 18264e1f0c5SHalil Pasic swiotlb_update_mem_attributes(); 18364e1f0c5SHalil Pasic } 18464e1f0c5SHalil Pasic 1851da177e4SLinus Torvalds void __init mem_init(void) 1861da177e4SLinus Torvalds { 1871b948d6cSMartin Schwidefsky cpumask_set_cpu(0, &init_mm.context.cpu_attach_mask); 1881b948d6cSMartin Schwidefsky cpumask_set_cpu(0, mm_cpumask(&init_mm)); 1891b948d6cSMartin Schwidefsky 1903a368f74SPhilipp Hachtmann set_max_mapnr(max_low_pfn); 1911da177e4SLinus Torvalds high_memory = (void *) __va(max_low_pfn * PAGE_SIZE); 1921da177e4SLinus Torvalds 19364e1f0c5SHalil Pasic pv_init(); 194e41ba111SSven Schnelle kfence_split_mapping(); 19545e576b1SMartin Schwidefsky /* Setup guest page hinting */ 19645e576b1SMartin Schwidefsky cmma_init(); 19745e576b1SMartin Schwidefsky 1981da177e4SLinus Torvalds /* this will put all low memory onto the freelists */ 199c6ffc5caSMike Rapoport memblock_free_all(); 2000999f119SJiang Liu setup_zero_pages(); /* Setup zeroed pages. */ 2011da177e4SLinus Torvalds 202c9b5ad54SMartin Schwidefsky cmma_init_nodat(); 2031da177e4SLinus Torvalds } 2041da177e4SLinus Torvalds 205d96221abSHeiko Carstens void free_initmem(void) 206d96221abSHeiko Carstens { 20757d7f939SMartin Schwidefsky __set_memory((unsigned long)_sinittext, 208ead7a22eSHeiko Carstens (unsigned long)(_einittext - _sinittext) >> PAGE_SHIFT, 20957d7f939SMartin Schwidefsky SET_MEMORY_RW | SET_MEMORY_NX); 210cb22cd2dSAlexander Egorenkov free_reserved_area(sclp_early_sccb, 211cb22cd2dSAlexander Egorenkov sclp_early_sccb + EXT_SCCB_READ_SCP, 212cb22cd2dSAlexander Egorenkov POISON_FREE_INITMEM, "unused early sccb"); 213dbe67df4SJiang Liu free_initmem_default(POISON_FREE_INITMEM); 2141da177e4SLinus Torvalds } 2151da177e4SLinus Torvalds 216604ddad0SHeiko Carstens unsigned long memory_block_size_bytes(void) 217604ddad0SHeiko Carstens { 218604ddad0SHeiko Carstens /* 219604ddad0SHeiko Carstens * Make sure the memory block size is always greater 220604ddad0SHeiko Carstens * or equal than the memory increment size. 221604ddad0SHeiko Carstens */ 222604ddad0SHeiko Carstens return max_t(unsigned long, MIN_MEMORY_BLOCK_SIZE, sclp.rzm); 223604ddad0SHeiko Carstens } 224604ddad0SHeiko Carstens 225421c175cSHeiko Carstens #ifdef CONFIG_MEMORY_HOTPLUG 22634ad7cdcSHeiko Carstens 22734ad7cdcSHeiko Carstens #ifdef CONFIG_CMA 22834ad7cdcSHeiko Carstens 22934ad7cdcSHeiko Carstens /* Prevent memory blocks which contain cma regions from going offline */ 23034ad7cdcSHeiko Carstens 23134ad7cdcSHeiko Carstens struct s390_cma_mem_data { 23234ad7cdcSHeiko Carstens unsigned long start; 23334ad7cdcSHeiko Carstens unsigned long end; 23434ad7cdcSHeiko Carstens }; 23534ad7cdcSHeiko Carstens 23634ad7cdcSHeiko Carstens static int s390_cma_check_range(struct cma *cma, void *data) 23734ad7cdcSHeiko Carstens { 23834ad7cdcSHeiko Carstens struct s390_cma_mem_data *mem_data; 23934ad7cdcSHeiko Carstens unsigned long start, end; 24034ad7cdcSHeiko Carstens 24134ad7cdcSHeiko Carstens mem_data = data; 24234ad7cdcSHeiko Carstens start = cma_get_base(cma); 24334ad7cdcSHeiko Carstens end = start + cma_get_size(cma); 24434ad7cdcSHeiko Carstens if (end < mem_data->start) 24534ad7cdcSHeiko Carstens return 0; 24634ad7cdcSHeiko Carstens if (start >= mem_data->end) 24734ad7cdcSHeiko Carstens return 0; 24834ad7cdcSHeiko Carstens return -EBUSY; 24934ad7cdcSHeiko Carstens } 25034ad7cdcSHeiko Carstens 25134ad7cdcSHeiko Carstens static int s390_cma_mem_notifier(struct notifier_block *nb, 25234ad7cdcSHeiko Carstens unsigned long action, void *data) 25334ad7cdcSHeiko Carstens { 25434ad7cdcSHeiko Carstens struct s390_cma_mem_data mem_data; 25534ad7cdcSHeiko Carstens struct memory_notify *arg; 25634ad7cdcSHeiko Carstens int rc = 0; 25734ad7cdcSHeiko Carstens 25834ad7cdcSHeiko Carstens arg = data; 25934ad7cdcSHeiko Carstens mem_data.start = arg->start_pfn << PAGE_SHIFT; 26034ad7cdcSHeiko Carstens mem_data.end = mem_data.start + (arg->nr_pages << PAGE_SHIFT); 26134ad7cdcSHeiko Carstens if (action == MEM_GOING_OFFLINE) 26234ad7cdcSHeiko Carstens rc = cma_for_each_area(s390_cma_check_range, &mem_data); 26334ad7cdcSHeiko Carstens return notifier_from_errno(rc); 26434ad7cdcSHeiko Carstens } 26534ad7cdcSHeiko Carstens 26634ad7cdcSHeiko Carstens static struct notifier_block s390_cma_mem_nb = { 26734ad7cdcSHeiko Carstens .notifier_call = s390_cma_mem_notifier, 26834ad7cdcSHeiko Carstens }; 26934ad7cdcSHeiko Carstens 27034ad7cdcSHeiko Carstens static int __init s390_cma_mem_init(void) 27134ad7cdcSHeiko Carstens { 27234ad7cdcSHeiko Carstens return register_memory_notifier(&s390_cma_mem_nb); 27334ad7cdcSHeiko Carstens } 27434ad7cdcSHeiko Carstens device_initcall(s390_cma_mem_init); 27534ad7cdcSHeiko Carstens 27634ad7cdcSHeiko Carstens #endif /* CONFIG_CMA */ 27734ad7cdcSHeiko Carstens 278940519f0SMichal Hocko int arch_add_memory(int nid, u64 start, u64 size, 279f5637d3bSLogan Gunthorpe struct mhp_params *params) 280421c175cSHeiko Carstens { 281892365abSGerald Schaefer unsigned long start_pfn = PFN_DOWN(start); 282892365abSGerald Schaefer unsigned long size_pages = PFN_DOWN(size); 283f1dd2cd1SMichal Hocko int rc; 284421c175cSHeiko Carstens 285f5637d3bSLogan Gunthorpe if (WARN_ON_ONCE(params->altmap)) 286973de24aSDavid Hildenbrand return -EINVAL; 287973de24aSDavid Hildenbrand 288bfeb022fSLogan Gunthorpe if (WARN_ON_ONCE(params->pgprot.pgprot != PAGE_KERNEL.pgprot)) 289bfeb022fSLogan Gunthorpe return -EINVAL; 290bfeb022fSLogan Gunthorpe 2917707248aSAnshuman Khandual VM_BUG_ON(!mhp_range_allowed(start, size, true)); 292421c175cSHeiko Carstens rc = vmem_add_mapping(start, size); 293421c175cSHeiko Carstens if (rc) 294421c175cSHeiko Carstens return rc; 295199071f1SGerald Schaefer 296f5637d3bSLogan Gunthorpe rc = __add_pages(nid, start_pfn, size_pages, params); 297421c175cSHeiko Carstens if (rc) 298421c175cSHeiko Carstens vmem_remove_mapping(start, size); 299421c175cSHeiko Carstens return rc; 300421c175cSHeiko Carstens } 30124d335caSWen Congyang 30265a2aa5fSDavid Hildenbrand void arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap) 30324d335caSWen Congyang { 30418c86506SDavid Hildenbrand unsigned long start_pfn = start >> PAGE_SHIFT; 30518c86506SDavid Hildenbrand unsigned long nr_pages = size >> PAGE_SHIFT; 30618c86506SDavid Hildenbrand 307feee6b29SDavid Hildenbrand __remove_pages(start_pfn, nr_pages, altmap); 30818c86506SDavid Hildenbrand vmem_remove_mapping(start, size); 30924d335caSWen Congyang } 310421c175cSHeiko Carstens #endif /* CONFIG_MEMORY_HOTPLUG */ 311