11da177e4SLinus Torvalds /* 210fbcf4cSKay Sievers * Basic Node interface support 31da177e4SLinus Torvalds */ 41da177e4SLinus Torvalds 51da177e4SLinus Torvalds #include <linux/module.h> 61da177e4SLinus Torvalds #include <linux/init.h> 71da177e4SLinus Torvalds #include <linux/mm.h> 8c04fc586SGary Hade #include <linux/memory.h> 9fa25c503SKOSAKI Motohiro #include <linux/vmstat.h> 106e259e7dSAndrew Morton #include <linux/notifier.h> 111da177e4SLinus Torvalds #include <linux/node.h> 121da177e4SLinus Torvalds #include <linux/hugetlb.h> 13ed4a6d7fSMel Gorman #include <linux/compaction.h> 141da177e4SLinus Torvalds #include <linux/cpumask.h> 151da177e4SLinus Torvalds #include <linux/topology.h> 161da177e4SLinus Torvalds #include <linux/nodemask.h> 1776b67ed9SKAMEZAWA Hiroyuki #include <linux/cpu.h> 18bde631a5SLee Schermerhorn #include <linux/device.h> 19af936a16SLee Schermerhorn #include <linux/swap.h> 2018e5b539STejun Heo #include <linux/slab.h> 211da177e4SLinus Torvalds 2210fbcf4cSKay Sievers static struct bus_type node_subsys = { 23af5ca3f4SKay Sievers .name = "node", 2410fbcf4cSKay Sievers .dev_name = "node", 251da177e4SLinus Torvalds }; 261da177e4SLinus Torvalds 271da177e4SLinus Torvalds 285aaba363SSudeep Holla static ssize_t node_read_cpumap(struct device *dev, bool list, char *buf) 291da177e4SLinus Torvalds { 301da177e4SLinus Torvalds struct node *node_dev = to_node(dev); 3110fbcf4cSKay Sievers const struct cpumask *mask = cpumask_of_node(node_dev->dev.id); 321da177e4SLinus Torvalds 3339106dcfSMike Travis /* 2008/04/07: buf currently PAGE_SIZE, need 9 chars per 32 bits. */ 3439106dcfSMike Travis BUILD_BUG_ON((NR_CPUS/32 * 9) > (PAGE_SIZE-1)); 351da177e4SLinus Torvalds 365aaba363SSudeep Holla return cpumap_print_to_pagebuf(list, buf, mask); 371da177e4SLinus Torvalds } 381da177e4SLinus Torvalds 3910fbcf4cSKay Sievers static inline ssize_t node_read_cpumask(struct device *dev, 4010fbcf4cSKay Sievers struct device_attribute *attr, char *buf) 4139106dcfSMike Travis { 425aaba363SSudeep Holla return node_read_cpumap(dev, false, buf); 4339106dcfSMike Travis } 4410fbcf4cSKay Sievers static inline ssize_t node_read_cpulist(struct device *dev, 4510fbcf4cSKay Sievers struct device_attribute *attr, char *buf) 4639106dcfSMike Travis { 475aaba363SSudeep Holla return node_read_cpumap(dev, true, buf); 4839106dcfSMike Travis } 4939106dcfSMike Travis 5010fbcf4cSKay Sievers static DEVICE_ATTR(cpumap, S_IRUGO, node_read_cpumask, NULL); 5110fbcf4cSKay Sievers static DEVICE_ATTR(cpulist, S_IRUGO, node_read_cpulist, NULL); 521da177e4SLinus Torvalds 531da177e4SLinus Torvalds #define K(x) ((x) << (PAGE_SHIFT - 10)) 5410fbcf4cSKay Sievers static ssize_t node_read_meminfo(struct device *dev, 5510fbcf4cSKay Sievers struct device_attribute *attr, char *buf) 561da177e4SLinus Torvalds { 571da177e4SLinus Torvalds int n; 581da177e4SLinus Torvalds int nid = dev->id; 59599d0c95SMel Gorman struct pglist_data *pgdat = NODE_DATA(nid); 601da177e4SLinus Torvalds struct sysinfo i; 611da177e4SLinus Torvalds 621da177e4SLinus Torvalds si_meminfo_node(&i, nid); 637ee92255SKOSAKI Motohiro n = sprintf(buf, 641da177e4SLinus Torvalds "Node %d MemTotal: %8lu kB\n" 651da177e4SLinus Torvalds "Node %d MemFree: %8lu kB\n" 661da177e4SLinus Torvalds "Node %d MemUsed: %8lu kB\n" 671da177e4SLinus Torvalds "Node %d Active: %8lu kB\n" 681da177e4SLinus Torvalds "Node %d Inactive: %8lu kB\n" 694f98a2feSRik van Riel "Node %d Active(anon): %8lu kB\n" 704f98a2feSRik van Riel "Node %d Inactive(anon): %8lu kB\n" 714f98a2feSRik van Riel "Node %d Active(file): %8lu kB\n" 724f98a2feSRik van Riel "Node %d Inactive(file): %8lu kB\n" 735344b7e6SNick Piggin "Node %d Unevictable: %8lu kB\n" 747ee92255SKOSAKI Motohiro "Node %d Mlocked: %8lu kB\n", 757ee92255SKOSAKI Motohiro nid, K(i.totalram), 767ee92255SKOSAKI Motohiro nid, K(i.freeram), 777ee92255SKOSAKI Motohiro nid, K(i.totalram - i.freeram), 78599d0c95SMel Gorman nid, K(node_page_state(pgdat, NR_ACTIVE_ANON) + 79599d0c95SMel Gorman node_page_state(pgdat, NR_ACTIVE_FILE)), 80599d0c95SMel Gorman nid, K(node_page_state(pgdat, NR_INACTIVE_ANON) + 81599d0c95SMel Gorman node_page_state(pgdat, NR_INACTIVE_FILE)), 82599d0c95SMel Gorman nid, K(node_page_state(pgdat, NR_ACTIVE_ANON)), 83599d0c95SMel Gorman nid, K(node_page_state(pgdat, NR_INACTIVE_ANON)), 84599d0c95SMel Gorman nid, K(node_page_state(pgdat, NR_ACTIVE_FILE)), 85599d0c95SMel Gorman nid, K(node_page_state(pgdat, NR_INACTIVE_FILE)), 86599d0c95SMel Gorman nid, K(node_page_state(pgdat, NR_UNEVICTABLE)), 8775ef7184SMel Gorman nid, K(sum_zone_node_page_state(nid, NR_MLOCK))); 887ee92255SKOSAKI Motohiro 89182e8e23SChristoph Lameter #ifdef CONFIG_HIGHMEM 907ee92255SKOSAKI Motohiro n += sprintf(buf + n, 911da177e4SLinus Torvalds "Node %d HighTotal: %8lu kB\n" 921da177e4SLinus Torvalds "Node %d HighFree: %8lu kB\n" 931da177e4SLinus Torvalds "Node %d LowTotal: %8lu kB\n" 947ee92255SKOSAKI Motohiro "Node %d LowFree: %8lu kB\n", 957ee92255SKOSAKI Motohiro nid, K(i.totalhigh), 967ee92255SKOSAKI Motohiro nid, K(i.freehigh), 977ee92255SKOSAKI Motohiro nid, K(i.totalram - i.totalhigh), 987ee92255SKOSAKI Motohiro nid, K(i.freeram - i.freehigh)); 99182e8e23SChristoph Lameter #endif 1007ee92255SKOSAKI Motohiro n += sprintf(buf + n, 101c07e02dbSMartin Hicks "Node %d Dirty: %8lu kB\n" 102c07e02dbSMartin Hicks "Node %d Writeback: %8lu kB\n" 103347ce434SChristoph Lameter "Node %d FilePages: %8lu kB\n" 104c07e02dbSMartin Hicks "Node %d Mapped: %8lu kB\n" 105f3dbd344SChristoph Lameter "Node %d AnonPages: %8lu kB\n" 1064b02108aSKOSAKI Motohiro "Node %d Shmem: %8lu kB\n" 107c6a7f572SKOSAKI Motohiro "Node %d KernelStack: %8lu kB\n" 108df849a15SChristoph Lameter "Node %d PageTables: %8lu kB\n" 109f5ef68daSAndrew Morton "Node %d NFS_Unstable: %8lu kB\n" 110d2c5e30cSChristoph Lameter "Node %d Bounce: %8lu kB\n" 111fc3ba692SMiklos Szeredi "Node %d WritebackTmp: %8lu kB\n" 112972d1a7bSChristoph Lameter "Node %d Slab: %8lu kB\n" 113972d1a7bSChristoph Lameter "Node %d SReclaimable: %8lu kB\n" 11405b258e9SDavid Rientjes "Node %d SUnreclaim: %8lu kB\n" 11505b258e9SDavid Rientjes #ifdef CONFIG_TRANSPARENT_HUGEPAGE 11605b258e9SDavid Rientjes "Node %d AnonHugePages: %8lu kB\n" 11765c45377SKirill A. Shutemov "Node %d ShmemHugePages: %8lu kB\n" 11865c45377SKirill A. Shutemov "Node %d ShmemPmdMapped: %8lu kB\n" 11905b258e9SDavid Rientjes #endif 12005b258e9SDavid Rientjes , 12111fb9989SMel Gorman nid, K(node_page_state(pgdat, NR_FILE_DIRTY)), 12211fb9989SMel Gorman nid, K(node_page_state(pgdat, NR_WRITEBACK)), 12311fb9989SMel Gorman nid, K(node_page_state(pgdat, NR_FILE_PAGES)), 12450658e2eSMel Gorman nid, K(node_page_state(pgdat, NR_FILE_MAPPED)), 1254b9d0fabSMel Gorman nid, K(node_page_state(pgdat, NR_ANON_MAPPED)), 126cc7452b6SRafael Aquini nid, K(i.sharedram), 127d30dd8beSAndy Lutomirski nid, sum_zone_node_page_state(nid, NR_KERNEL_STACK_KB), 12875ef7184SMel Gorman nid, K(sum_zone_node_page_state(nid, NR_PAGETABLE)), 12911fb9989SMel Gorman nid, K(node_page_state(pgdat, NR_UNSTABLE_NFS)), 13075ef7184SMel Gorman nid, K(sum_zone_node_page_state(nid, NR_BOUNCE)), 13111fb9989SMel Gorman nid, K(node_page_state(pgdat, NR_WRITEBACK_TEMP)), 13275ef7184SMel Gorman nid, K(sum_zone_node_page_state(nid, NR_SLAB_RECLAIMABLE) + 13375ef7184SMel Gorman sum_zone_node_page_state(nid, NR_SLAB_UNRECLAIMABLE)), 13475ef7184SMel Gorman nid, K(sum_zone_node_page_state(nid, NR_SLAB_RECLAIMABLE)), 13505b258e9SDavid Rientjes #ifdef CONFIG_TRANSPARENT_HUGEPAGE 13675ef7184SMel Gorman nid, K(sum_zone_node_page_state(nid, NR_SLAB_UNRECLAIMABLE)), 13711fb9989SMel Gorman nid, K(node_page_state(pgdat, NR_ANON_THPS) * 13865c45377SKirill A. Shutemov HPAGE_PMD_NR), 13911fb9989SMel Gorman nid, K(node_page_state(pgdat, NR_SHMEM_THPS) * 14065c45377SKirill A. Shutemov HPAGE_PMD_NR), 14111fb9989SMel Gorman nid, K(node_page_state(pgdat, NR_SHMEM_PMDMAPPED) * 14291a13c28SClaudio Scordino HPAGE_PMD_NR)); 14391a13c28SClaudio Scordino #else 14475ef7184SMel Gorman nid, K(sum_zone_node_page_state(nid, NR_SLAB_UNRECLAIMABLE))); 14505b258e9SDavid Rientjes #endif 1461da177e4SLinus Torvalds n += hugetlb_report_node_meminfo(nid, buf + n); 1471da177e4SLinus Torvalds return n; 1481da177e4SLinus Torvalds } 1491da177e4SLinus Torvalds 1501da177e4SLinus Torvalds #undef K 15110fbcf4cSKay Sievers static DEVICE_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL); 1521da177e4SLinus Torvalds 15310fbcf4cSKay Sievers static ssize_t node_read_numastat(struct device *dev, 15410fbcf4cSKay Sievers struct device_attribute *attr, char *buf) 1551da177e4SLinus Torvalds { 1561da177e4SLinus Torvalds return sprintf(buf, 1571da177e4SLinus Torvalds "numa_hit %lu\n" 1581da177e4SLinus Torvalds "numa_miss %lu\n" 1591da177e4SLinus Torvalds "numa_foreign %lu\n" 1601da177e4SLinus Torvalds "interleave_hit %lu\n" 1611da177e4SLinus Torvalds "local_node %lu\n" 1621da177e4SLinus Torvalds "other_node %lu\n", 16375ef7184SMel Gorman sum_zone_node_page_state(dev->id, NUMA_HIT), 16475ef7184SMel Gorman sum_zone_node_page_state(dev->id, NUMA_MISS), 16575ef7184SMel Gorman sum_zone_node_page_state(dev->id, NUMA_FOREIGN), 16675ef7184SMel Gorman sum_zone_node_page_state(dev->id, NUMA_INTERLEAVE_HIT), 16775ef7184SMel Gorman sum_zone_node_page_state(dev->id, NUMA_LOCAL), 16875ef7184SMel Gorman sum_zone_node_page_state(dev->id, NUMA_OTHER)); 1691da177e4SLinus Torvalds } 17010fbcf4cSKay Sievers static DEVICE_ATTR(numastat, S_IRUGO, node_read_numastat, NULL); 1711da177e4SLinus Torvalds 17210fbcf4cSKay Sievers static ssize_t node_read_vmstat(struct device *dev, 17310fbcf4cSKay Sievers struct device_attribute *attr, char *buf) 1742ac39037SMichael Rubin { 1752ac39037SMichael Rubin int nid = dev->id; 17675ef7184SMel Gorman struct pglist_data *pgdat = NODE_DATA(nid); 177fa25c503SKOSAKI Motohiro int i; 178fa25c503SKOSAKI Motohiro int n = 0; 179fa25c503SKOSAKI Motohiro 180fa25c503SKOSAKI Motohiro for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) 181fa25c503SKOSAKI Motohiro n += sprintf(buf+n, "%s %lu\n", vmstat_text[i], 18275ef7184SMel Gorman sum_zone_node_page_state(nid, i)); 18375ef7184SMel Gorman 18475ef7184SMel Gorman for (i = 0; i < NR_VM_NODE_STAT_ITEMS; i++) 18575ef7184SMel Gorman n += sprintf(buf+n, "%s %lu\n", 18675ef7184SMel Gorman vmstat_text[i + NR_VM_ZONE_STAT_ITEMS], 18775ef7184SMel Gorman node_page_state(pgdat, i)); 188fa25c503SKOSAKI Motohiro 189fa25c503SKOSAKI Motohiro return n; 1902ac39037SMichael Rubin } 19110fbcf4cSKay Sievers static DEVICE_ATTR(vmstat, S_IRUGO, node_read_vmstat, NULL); 1922ac39037SMichael Rubin 19310fbcf4cSKay Sievers static ssize_t node_read_distance(struct device *dev, 19410fbcf4cSKay Sievers struct device_attribute *attr, char *buf) 1951da177e4SLinus Torvalds { 1961da177e4SLinus Torvalds int nid = dev->id; 1971da177e4SLinus Torvalds int len = 0; 1981da177e4SLinus Torvalds int i; 1991da177e4SLinus Torvalds 20012ee3c0aSDavid Rientjes /* 20112ee3c0aSDavid Rientjes * buf is currently PAGE_SIZE in length and each node needs 4 chars 20212ee3c0aSDavid Rientjes * at the most (distance + space or newline). 20312ee3c0aSDavid Rientjes */ 20412ee3c0aSDavid Rientjes BUILD_BUG_ON(MAX_NUMNODES * 4 > PAGE_SIZE); 2051da177e4SLinus Torvalds 2061da177e4SLinus Torvalds for_each_online_node(i) 2071da177e4SLinus Torvalds len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i)); 2081da177e4SLinus Torvalds 2091da177e4SLinus Torvalds len += sprintf(buf + len, "\n"); 2101da177e4SLinus Torvalds return len; 2111da177e4SLinus Torvalds } 21210fbcf4cSKay Sievers static DEVICE_ATTR(distance, S_IRUGO, node_read_distance, NULL); 2131da177e4SLinus Torvalds 2143c9b8aafSTakashi Iwai static struct attribute *node_dev_attrs[] = { 2153c9b8aafSTakashi Iwai &dev_attr_cpumap.attr, 2163c9b8aafSTakashi Iwai &dev_attr_cpulist.attr, 2173c9b8aafSTakashi Iwai &dev_attr_meminfo.attr, 2183c9b8aafSTakashi Iwai &dev_attr_numastat.attr, 2193c9b8aafSTakashi Iwai &dev_attr_distance.attr, 2203c9b8aafSTakashi Iwai &dev_attr_vmstat.attr, 2213c9b8aafSTakashi Iwai NULL 2223c9b8aafSTakashi Iwai }; 2237ca7ec40SGreg Kroah-Hartman ATTRIBUTE_GROUPS(node_dev); 2243c9b8aafSTakashi Iwai 2259a305230SLee Schermerhorn #ifdef CONFIG_HUGETLBFS 2269a305230SLee Schermerhorn /* 2279a305230SLee Schermerhorn * hugetlbfs per node attributes registration interface: 2289a305230SLee Schermerhorn * When/if hugetlb[fs] subsystem initializes [sometime after this module], 2294faf8d95SLee Schermerhorn * it will register its per node attributes for all online nodes with 2304faf8d95SLee Schermerhorn * memory. It will also call register_hugetlbfs_with_node(), below, to 2319a305230SLee Schermerhorn * register its attribute registration functions with this node driver. 2329a305230SLee Schermerhorn * Once these hooks have been initialized, the node driver will call into 2339a305230SLee Schermerhorn * the hugetlb module to [un]register attributes for hot-plugged nodes. 2349a305230SLee Schermerhorn */ 2359a305230SLee Schermerhorn static node_registration_func_t __hugetlb_register_node; 2369a305230SLee Schermerhorn static node_registration_func_t __hugetlb_unregister_node; 2379a305230SLee Schermerhorn 23839da08cbSLee Schermerhorn static inline bool hugetlb_register_node(struct node *node) 2399a305230SLee Schermerhorn { 2404faf8d95SLee Schermerhorn if (__hugetlb_register_node && 2418cebfcd0SLai Jiangshan node_state(node->dev.id, N_MEMORY)) { 2429a305230SLee Schermerhorn __hugetlb_register_node(node); 24339da08cbSLee Schermerhorn return true; 24439da08cbSLee Schermerhorn } 24539da08cbSLee Schermerhorn return false; 2469a305230SLee Schermerhorn } 2479a305230SLee Schermerhorn 2489a305230SLee Schermerhorn static inline void hugetlb_unregister_node(struct node *node) 2499a305230SLee Schermerhorn { 2509a305230SLee Schermerhorn if (__hugetlb_unregister_node) 2519a305230SLee Schermerhorn __hugetlb_unregister_node(node); 2529a305230SLee Schermerhorn } 2539a305230SLee Schermerhorn 2549a305230SLee Schermerhorn void register_hugetlbfs_with_node(node_registration_func_t doregister, 2559a305230SLee Schermerhorn node_registration_func_t unregister) 2569a305230SLee Schermerhorn { 2579a305230SLee Schermerhorn __hugetlb_register_node = doregister; 2589a305230SLee Schermerhorn __hugetlb_unregister_node = unregister; 2599a305230SLee Schermerhorn } 2609a305230SLee Schermerhorn #else 2619a305230SLee Schermerhorn static inline void hugetlb_register_node(struct node *node) {} 2629a305230SLee Schermerhorn 2639a305230SLee Schermerhorn static inline void hugetlb_unregister_node(struct node *node) {} 2649a305230SLee Schermerhorn #endif 2659a305230SLee Schermerhorn 2668c7b5b4eSYasuaki Ishimatsu static void node_device_release(struct device *dev) 2678c7b5b4eSYasuaki Ishimatsu { 2688c7b5b4eSYasuaki Ishimatsu struct node *node = to_node(dev); 2698c7b5b4eSYasuaki Ishimatsu 2708c7b5b4eSYasuaki Ishimatsu #if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_HUGETLBFS) 2718c7b5b4eSYasuaki Ishimatsu /* 2728c7b5b4eSYasuaki Ishimatsu * We schedule the work only when a memory section is 2738c7b5b4eSYasuaki Ishimatsu * onlined/offlined on this node. When we come here, 2748c7b5b4eSYasuaki Ishimatsu * all the memory on this node has been offlined, 2758c7b5b4eSYasuaki Ishimatsu * so we won't enqueue new work to this work. 2768c7b5b4eSYasuaki Ishimatsu * 2778c7b5b4eSYasuaki Ishimatsu * The work is using node->node_work, so we should 2788c7b5b4eSYasuaki Ishimatsu * flush work before freeing the memory. 2798c7b5b4eSYasuaki Ishimatsu */ 2808c7b5b4eSYasuaki Ishimatsu flush_work(&node->node_work); 2818c7b5b4eSYasuaki Ishimatsu #endif 2828c7b5b4eSYasuaki Ishimatsu kfree(node); 2838c7b5b4eSYasuaki Ishimatsu } 2841da177e4SLinus Torvalds 2851da177e4SLinus Torvalds /* 286405ae7d3SRobert P. J. Day * register_node - Setup a sysfs device for a node. 2871da177e4SLinus Torvalds * @num - Node number to use when creating the device. 2881da177e4SLinus Torvalds * 2891da177e4SLinus Torvalds * Initialize and register the node device. 2901da177e4SLinus Torvalds */ 291fa264375SYasuaki Ishimatsu static int register_node(struct node *node, int num, struct node *parent) 2921da177e4SLinus Torvalds { 2931da177e4SLinus Torvalds int error; 2941da177e4SLinus Torvalds 29510fbcf4cSKay Sievers node->dev.id = num; 29610fbcf4cSKay Sievers node->dev.bus = &node_subsys; 2978c7b5b4eSYasuaki Ishimatsu node->dev.release = node_device_release; 2987ca7ec40SGreg Kroah-Hartman node->dev.groups = node_dev_groups; 29910fbcf4cSKay Sievers error = device_register(&node->dev); 3001da177e4SLinus Torvalds 3011da177e4SLinus Torvalds if (!error){ 3029a305230SLee Schermerhorn hugetlb_register_node(node); 303ed4a6d7fSMel Gorman 304ed4a6d7fSMel Gorman compaction_register_node(node); 3051da177e4SLinus Torvalds } 3061da177e4SLinus Torvalds return error; 3071da177e4SLinus Torvalds } 3081da177e4SLinus Torvalds 3094b45099bSKeiichiro Tokunaga /** 3104b45099bSKeiichiro Tokunaga * unregister_node - unregister a node device 3114b45099bSKeiichiro Tokunaga * @node: node going away 3124b45099bSKeiichiro Tokunaga * 3134b45099bSKeiichiro Tokunaga * Unregisters a node device @node. All the devices on the node must be 3144b45099bSKeiichiro Tokunaga * unregistered before calling this function. 3154b45099bSKeiichiro Tokunaga */ 3164b45099bSKeiichiro Tokunaga void unregister_node(struct node *node) 3174b45099bSKeiichiro Tokunaga { 3184faf8d95SLee Schermerhorn hugetlb_unregister_node(node); /* no-op, if memoryless node */ 319af936a16SLee Schermerhorn 32010fbcf4cSKay Sievers device_unregister(&node->dev); 3214b45099bSKeiichiro Tokunaga } 3224b45099bSKeiichiro Tokunaga 3238732794bSWen Congyang struct node *node_devices[MAX_NUMNODES]; 3240fc44159SYasunori Goto 32576b67ed9SKAMEZAWA Hiroyuki /* 32676b67ed9SKAMEZAWA Hiroyuki * register cpu under node 32776b67ed9SKAMEZAWA Hiroyuki */ 32876b67ed9SKAMEZAWA Hiroyuki int register_cpu_under_node(unsigned int cpu, unsigned int nid) 32976b67ed9SKAMEZAWA Hiroyuki { 3301830794aSAlex Chiang int ret; 3318a25a2fdSKay Sievers struct device *obj; 332f8246f31SAlex Chiang 333f8246f31SAlex Chiang if (!node_online(nid)) 334f8246f31SAlex Chiang return 0; 335f8246f31SAlex Chiang 3368a25a2fdSKay Sievers obj = get_cpu_device(cpu); 33776b67ed9SKAMEZAWA Hiroyuki if (!obj) 33876b67ed9SKAMEZAWA Hiroyuki return 0; 339f8246f31SAlex Chiang 3408732794bSWen Congyang ret = sysfs_create_link(&node_devices[nid]->dev.kobj, 34176b67ed9SKAMEZAWA Hiroyuki &obj->kobj, 34276b67ed9SKAMEZAWA Hiroyuki kobject_name(&obj->kobj)); 3431830794aSAlex Chiang if (ret) 3441830794aSAlex Chiang return ret; 3451830794aSAlex Chiang 3461830794aSAlex Chiang return sysfs_create_link(&obj->kobj, 3478732794bSWen Congyang &node_devices[nid]->dev.kobj, 3488732794bSWen Congyang kobject_name(&node_devices[nid]->dev.kobj)); 34976b67ed9SKAMEZAWA Hiroyuki } 35076b67ed9SKAMEZAWA Hiroyuki 35176b67ed9SKAMEZAWA Hiroyuki int unregister_cpu_under_node(unsigned int cpu, unsigned int nid) 35276b67ed9SKAMEZAWA Hiroyuki { 3538a25a2fdSKay Sievers struct device *obj; 354b9d52dadSAlex Chiang 355b9d52dadSAlex Chiang if (!node_online(nid)) 356b9d52dadSAlex Chiang return 0; 357b9d52dadSAlex Chiang 3588a25a2fdSKay Sievers obj = get_cpu_device(cpu); 359b9d52dadSAlex Chiang if (!obj) 360b9d52dadSAlex Chiang return 0; 361b9d52dadSAlex Chiang 3628732794bSWen Congyang sysfs_remove_link(&node_devices[nid]->dev.kobj, 36376b67ed9SKAMEZAWA Hiroyuki kobject_name(&obj->kobj)); 3641830794aSAlex Chiang sysfs_remove_link(&obj->kobj, 3658732794bSWen Congyang kobject_name(&node_devices[nid]->dev.kobj)); 366b9d52dadSAlex Chiang 36776b67ed9SKAMEZAWA Hiroyuki return 0; 36876b67ed9SKAMEZAWA Hiroyuki } 36976b67ed9SKAMEZAWA Hiroyuki 370c04fc586SGary Hade #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE 371c04fc586SGary Hade #define page_initialized(page) (page->lru.next) 372c04fc586SGary Hade 3733a80a7faSMel Gorman static int __init_refok get_nid_for_pfn(unsigned long pfn) 374c04fc586SGary Hade { 375c04fc586SGary Hade struct page *page; 376c04fc586SGary Hade 377c04fc586SGary Hade if (!pfn_valid_within(pfn)) 378c04fc586SGary Hade return -1; 3793a80a7faSMel Gorman #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT 3803a80a7faSMel Gorman if (system_state == SYSTEM_BOOTING) 3813a80a7faSMel Gorman return early_pfn_to_nid(pfn); 3823a80a7faSMel Gorman #endif 383c04fc586SGary Hade page = pfn_to_page(pfn); 384c04fc586SGary Hade if (!page_initialized(page)) 385c04fc586SGary Hade return -1; 386c04fc586SGary Hade return pfn_to_nid(pfn); 387c04fc586SGary Hade } 388c04fc586SGary Hade 389c04fc586SGary Hade /* register memory section under specified node if it spans that node */ 390c04fc586SGary Hade int register_mem_sect_under_node(struct memory_block *mem_blk, int nid) 391c04fc586SGary Hade { 392dee5d0d5SAlex Chiang int ret; 393c04fc586SGary Hade unsigned long pfn, sect_start_pfn, sect_end_pfn; 394c04fc586SGary Hade 395c04fc586SGary Hade if (!mem_blk) 396c04fc586SGary Hade return -EFAULT; 397c04fc586SGary Hade if (!node_online(nid)) 398c04fc586SGary Hade return 0; 399d3360164SNathan Fontenot 400d3360164SNathan Fontenot sect_start_pfn = section_nr_to_pfn(mem_blk->start_section_nr); 401d3360164SNathan Fontenot sect_end_pfn = section_nr_to_pfn(mem_blk->end_section_nr); 402d3360164SNathan Fontenot sect_end_pfn += PAGES_PER_SECTION - 1; 403c04fc586SGary Hade for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) { 404c04fc586SGary Hade int page_nid; 405c04fc586SGary Hade 40604697858SYinghai Lu /* 40704697858SYinghai Lu * memory block could have several absent sections from start. 40804697858SYinghai Lu * skip pfn range from absent section 40904697858SYinghai Lu */ 41004697858SYinghai Lu if (!pfn_present(pfn)) { 41104697858SYinghai Lu pfn = round_down(pfn + PAGES_PER_SECTION, 41204697858SYinghai Lu PAGES_PER_SECTION) - 1; 41304697858SYinghai Lu continue; 41404697858SYinghai Lu } 41504697858SYinghai Lu 416c04fc586SGary Hade page_nid = get_nid_for_pfn(pfn); 417c04fc586SGary Hade if (page_nid < 0) 418c04fc586SGary Hade continue; 419c04fc586SGary Hade if (page_nid != nid) 420c04fc586SGary Hade continue; 4218732794bSWen Congyang ret = sysfs_create_link_nowarn(&node_devices[nid]->dev.kobj, 42210fbcf4cSKay Sievers &mem_blk->dev.kobj, 42310fbcf4cSKay Sievers kobject_name(&mem_blk->dev.kobj)); 424dee5d0d5SAlex Chiang if (ret) 425dee5d0d5SAlex Chiang return ret; 426dee5d0d5SAlex Chiang 42710fbcf4cSKay Sievers return sysfs_create_link_nowarn(&mem_blk->dev.kobj, 4288732794bSWen Congyang &node_devices[nid]->dev.kobj, 4298732794bSWen Congyang kobject_name(&node_devices[nid]->dev.kobj)); 430c04fc586SGary Hade } 431c04fc586SGary Hade /* mem section does not span the specified node */ 432c04fc586SGary Hade return 0; 433c04fc586SGary Hade } 434c04fc586SGary Hade 435c04fc586SGary Hade /* unregister memory section under all nodes that it spans */ 436d3360164SNathan Fontenot int unregister_mem_sect_under_nodes(struct memory_block *mem_blk, 437d3360164SNathan Fontenot unsigned long phys_index) 438c04fc586SGary Hade { 4399ae49fabSDavid Rientjes NODEMASK_ALLOC(nodemask_t, unlinked_nodes, GFP_KERNEL); 440c04fc586SGary Hade unsigned long pfn, sect_start_pfn, sect_end_pfn; 441c04fc586SGary Hade 4429ae49fabSDavid Rientjes if (!mem_blk) { 4439ae49fabSDavid Rientjes NODEMASK_FREE(unlinked_nodes); 444c04fc586SGary Hade return -EFAULT; 4459ae49fabSDavid Rientjes } 4469ae49fabSDavid Rientjes if (!unlinked_nodes) 4479ae49fabSDavid Rientjes return -ENOMEM; 4489ae49fabSDavid Rientjes nodes_clear(*unlinked_nodes); 449d3360164SNathan Fontenot 450d3360164SNathan Fontenot sect_start_pfn = section_nr_to_pfn(phys_index); 451c04fc586SGary Hade sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1; 452c04fc586SGary Hade for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) { 45347504980SRoel Kluin int nid; 454c04fc586SGary Hade 455c04fc586SGary Hade nid = get_nid_for_pfn(pfn); 456c04fc586SGary Hade if (nid < 0) 457c04fc586SGary Hade continue; 458c04fc586SGary Hade if (!node_online(nid)) 459c04fc586SGary Hade continue; 4609ae49fabSDavid Rientjes if (node_test_and_set(nid, *unlinked_nodes)) 461c04fc586SGary Hade continue; 4628732794bSWen Congyang sysfs_remove_link(&node_devices[nid]->dev.kobj, 46310fbcf4cSKay Sievers kobject_name(&mem_blk->dev.kobj)); 46410fbcf4cSKay Sievers sysfs_remove_link(&mem_blk->dev.kobj, 4658732794bSWen Congyang kobject_name(&node_devices[nid]->dev.kobj)); 466c04fc586SGary Hade } 4679ae49fabSDavid Rientjes NODEMASK_FREE(unlinked_nodes); 468c04fc586SGary Hade return 0; 469c04fc586SGary Hade } 470c04fc586SGary Hade 471c04fc586SGary Hade static int link_mem_sections(int nid) 472c04fc586SGary Hade { 473c04fc586SGary Hade unsigned long start_pfn = NODE_DATA(nid)->node_start_pfn; 474c04fc586SGary Hade unsigned long end_pfn = start_pfn + NODE_DATA(nid)->node_spanned_pages; 475c04fc586SGary Hade unsigned long pfn; 47663d027a6SRobin Holt struct memory_block *mem_blk = NULL; 477c04fc586SGary Hade int err = 0; 478c04fc586SGary Hade 479c04fc586SGary Hade for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { 480c04fc586SGary Hade unsigned long section_nr = pfn_to_section_nr(pfn); 481c04fc586SGary Hade struct mem_section *mem_sect; 482c04fc586SGary Hade int ret; 483c04fc586SGary Hade 484c04fc586SGary Hade if (!present_section_nr(section_nr)) 485c04fc586SGary Hade continue; 486c04fc586SGary Hade mem_sect = __nr_to_section(section_nr); 487321bf4edSYinghai Lu 488321bf4edSYinghai Lu /* same memblock ? */ 489321bf4edSYinghai Lu if (mem_blk) 490321bf4edSYinghai Lu if ((section_nr >= mem_blk->start_section_nr) && 491321bf4edSYinghai Lu (section_nr <= mem_blk->end_section_nr)) 492321bf4edSYinghai Lu continue; 493321bf4edSYinghai Lu 49463d027a6SRobin Holt mem_blk = find_memory_block_hinted(mem_sect, mem_blk); 495321bf4edSYinghai Lu 496c04fc586SGary Hade ret = register_mem_sect_under_node(mem_blk, nid); 497c04fc586SGary Hade if (!err) 498c04fc586SGary Hade err = ret; 499c04fc586SGary Hade 500c04fc586SGary Hade /* discard ref obtained in find_memory_block() */ 501c04fc586SGary Hade } 50263d027a6SRobin Holt 50363d027a6SRobin Holt if (mem_blk) 50410fbcf4cSKay Sievers kobject_put(&mem_blk->dev.kobj); 505c04fc586SGary Hade return err; 506c04fc586SGary Hade } 5074faf8d95SLee Schermerhorn 50839da08cbSLee Schermerhorn #ifdef CONFIG_HUGETLBFS 5094faf8d95SLee Schermerhorn /* 5104faf8d95SLee Schermerhorn * Handle per node hstate attribute [un]registration on transistions 5114faf8d95SLee Schermerhorn * to/from memoryless state. 5124faf8d95SLee Schermerhorn */ 51339da08cbSLee Schermerhorn static void node_hugetlb_work(struct work_struct *work) 51439da08cbSLee Schermerhorn { 51539da08cbSLee Schermerhorn struct node *node = container_of(work, struct node, node_work); 51639da08cbSLee Schermerhorn 51739da08cbSLee Schermerhorn /* 51839da08cbSLee Schermerhorn * We only get here when a node transitions to/from memoryless state. 51939da08cbSLee Schermerhorn * We can detect which transition occurred by examining whether the 52039da08cbSLee Schermerhorn * node has memory now. hugetlb_register_node() already check this 52139da08cbSLee Schermerhorn * so we try to register the attributes. If that fails, then the 52239da08cbSLee Schermerhorn * node has transitioned to memoryless, try to unregister the 52339da08cbSLee Schermerhorn * attributes. 52439da08cbSLee Schermerhorn */ 52539da08cbSLee Schermerhorn if (!hugetlb_register_node(node)) 52639da08cbSLee Schermerhorn hugetlb_unregister_node(node); 52739da08cbSLee Schermerhorn } 52839da08cbSLee Schermerhorn 52939da08cbSLee Schermerhorn static void init_node_hugetlb_work(int nid) 53039da08cbSLee Schermerhorn { 5318732794bSWen Congyang INIT_WORK(&node_devices[nid]->node_work, node_hugetlb_work); 53239da08cbSLee Schermerhorn } 5334faf8d95SLee Schermerhorn 5344faf8d95SLee Schermerhorn static int node_memory_callback(struct notifier_block *self, 5354faf8d95SLee Schermerhorn unsigned long action, void *arg) 5364faf8d95SLee Schermerhorn { 5374faf8d95SLee Schermerhorn struct memory_notify *mnb = arg; 5384faf8d95SLee Schermerhorn int nid = mnb->status_change_nid; 5394faf8d95SLee Schermerhorn 5404faf8d95SLee Schermerhorn switch (action) { 54139da08cbSLee Schermerhorn case MEM_ONLINE: 54239da08cbSLee Schermerhorn case MEM_OFFLINE: 54339da08cbSLee Schermerhorn /* 54439da08cbSLee Schermerhorn * offload per node hstate [un]registration to a work thread 54539da08cbSLee Schermerhorn * when transitioning to/from memoryless state. 54639da08cbSLee Schermerhorn */ 5474faf8d95SLee Schermerhorn if (nid != NUMA_NO_NODE) 5488732794bSWen Congyang schedule_work(&node_devices[nid]->node_work); 5494faf8d95SLee Schermerhorn break; 55039da08cbSLee Schermerhorn 5514faf8d95SLee Schermerhorn case MEM_GOING_ONLINE: 5524faf8d95SLee Schermerhorn case MEM_GOING_OFFLINE: 5534faf8d95SLee Schermerhorn case MEM_CANCEL_ONLINE: 5544faf8d95SLee Schermerhorn case MEM_CANCEL_OFFLINE: 5554faf8d95SLee Schermerhorn default: 5564faf8d95SLee Schermerhorn break; 5574faf8d95SLee Schermerhorn } 5584faf8d95SLee Schermerhorn 5594faf8d95SLee Schermerhorn return NOTIFY_OK; 5604faf8d95SLee Schermerhorn } 56139da08cbSLee Schermerhorn #endif /* CONFIG_HUGETLBFS */ 56239da08cbSLee Schermerhorn #else /* !CONFIG_MEMORY_HOTPLUG_SPARSE */ 5634faf8d95SLee Schermerhorn 56439da08cbSLee Schermerhorn static int link_mem_sections(int nid) { return 0; } 56539da08cbSLee Schermerhorn #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */ 56639da08cbSLee Schermerhorn 56739da08cbSLee Schermerhorn #if !defined(CONFIG_MEMORY_HOTPLUG_SPARSE) || \ 56839da08cbSLee Schermerhorn !defined(CONFIG_HUGETLBFS) 5694faf8d95SLee Schermerhorn static inline int node_memory_callback(struct notifier_block *self, 5704faf8d95SLee Schermerhorn unsigned long action, void *arg) 5714faf8d95SLee Schermerhorn { 5724faf8d95SLee Schermerhorn return NOTIFY_OK; 5734faf8d95SLee Schermerhorn } 57439da08cbSLee Schermerhorn 57539da08cbSLee Schermerhorn static void init_node_hugetlb_work(int nid) { } 57639da08cbSLee Schermerhorn 57739da08cbSLee Schermerhorn #endif 578c04fc586SGary Hade 5790fc44159SYasunori Goto int register_one_node(int nid) 5800fc44159SYasunori Goto { 5810fc44159SYasunori Goto int error = 0; 58276b67ed9SKAMEZAWA Hiroyuki int cpu; 5830fc44159SYasunori Goto 5840fc44159SYasunori Goto if (node_online(nid)) { 5850fc44159SYasunori Goto int p_node = parent_node(nid); 5860fc44159SYasunori Goto struct node *parent = NULL; 5870fc44159SYasunori Goto 5880fc44159SYasunori Goto if (p_node != nid) 5898732794bSWen Congyang parent = node_devices[p_node]; 5900fc44159SYasunori Goto 5918732794bSWen Congyang node_devices[nid] = kzalloc(sizeof(struct node), GFP_KERNEL); 5928732794bSWen Congyang if (!node_devices[nid]) 5938732794bSWen Congyang return -ENOMEM; 5948732794bSWen Congyang 5958732794bSWen Congyang error = register_node(node_devices[nid], nid, parent); 59676b67ed9SKAMEZAWA Hiroyuki 59776b67ed9SKAMEZAWA Hiroyuki /* link cpu under this node */ 59876b67ed9SKAMEZAWA Hiroyuki for_each_present_cpu(cpu) { 59976b67ed9SKAMEZAWA Hiroyuki if (cpu_to_node(cpu) == nid) 60076b67ed9SKAMEZAWA Hiroyuki register_cpu_under_node(cpu, nid); 60176b67ed9SKAMEZAWA Hiroyuki } 602c04fc586SGary Hade 603c04fc586SGary Hade /* link memory sections under this node */ 604c04fc586SGary Hade error = link_mem_sections(nid); 60539da08cbSLee Schermerhorn 60639da08cbSLee Schermerhorn /* initialize work queue for memory hot plug */ 60739da08cbSLee Schermerhorn init_node_hugetlb_work(nid); 6080fc44159SYasunori Goto } 6090fc44159SYasunori Goto 6100fc44159SYasunori Goto return error; 6110fc44159SYasunori Goto 6120fc44159SYasunori Goto } 6130fc44159SYasunori Goto 6140fc44159SYasunori Goto void unregister_one_node(int nid) 6150fc44159SYasunori Goto { 61692d585efSXishi Qiu if (!node_devices[nid]) 61792d585efSXishi Qiu return; 61892d585efSXishi Qiu 6198732794bSWen Congyang unregister_node(node_devices[nid]); 6208732794bSWen Congyang node_devices[nid] = NULL; 6210fc44159SYasunori Goto } 6220fc44159SYasunori Goto 623bde631a5SLee Schermerhorn /* 624bde631a5SLee Schermerhorn * node states attributes 625bde631a5SLee Schermerhorn */ 626bde631a5SLee Schermerhorn 627bde631a5SLee Schermerhorn static ssize_t print_nodes_state(enum node_states state, char *buf) 628bde631a5SLee Schermerhorn { 629bde631a5SLee Schermerhorn int n; 630bde631a5SLee Schermerhorn 631f799b1a7STejun Heo n = scnprintf(buf, PAGE_SIZE - 1, "%*pbl", 632f799b1a7STejun Heo nodemask_pr_args(&node_states[state])); 633f6238818SRyota Ozaki buf[n++] = '\n'; 634f6238818SRyota Ozaki buf[n] = '\0'; 635bde631a5SLee Schermerhorn return n; 636bde631a5SLee Schermerhorn } 637bde631a5SLee Schermerhorn 638b15f562fSAndi Kleen struct node_attr { 63910fbcf4cSKay Sievers struct device_attribute attr; 640b15f562fSAndi Kleen enum node_states state; 641b15f562fSAndi Kleen }; 642b15f562fSAndi Kleen 64310fbcf4cSKay Sievers static ssize_t show_node_state(struct device *dev, 64410fbcf4cSKay Sievers struct device_attribute *attr, char *buf) 645bde631a5SLee Schermerhorn { 646b15f562fSAndi Kleen struct node_attr *na = container_of(attr, struct node_attr, attr); 647b15f562fSAndi Kleen return print_nodes_state(na->state, buf); 648bde631a5SLee Schermerhorn } 649bde631a5SLee Schermerhorn 650b15f562fSAndi Kleen #define _NODE_ATTR(name, state) \ 65110fbcf4cSKay Sievers { __ATTR(name, 0444, show_node_state, NULL), state } 652bde631a5SLee Schermerhorn 653b15f562fSAndi Kleen static struct node_attr node_state_attr[] = { 654fcf07d22SLai Jiangshan [N_POSSIBLE] = _NODE_ATTR(possible, N_POSSIBLE), 655fcf07d22SLai Jiangshan [N_ONLINE] = _NODE_ATTR(online, N_ONLINE), 656fcf07d22SLai Jiangshan [N_NORMAL_MEMORY] = _NODE_ATTR(has_normal_memory, N_NORMAL_MEMORY), 657bde631a5SLee Schermerhorn #ifdef CONFIG_HIGHMEM 658fcf07d22SLai Jiangshan [N_HIGH_MEMORY] = _NODE_ATTR(has_high_memory, N_HIGH_MEMORY), 659bde631a5SLee Schermerhorn #endif 66020b2f52bSLai Jiangshan #ifdef CONFIG_MOVABLE_NODE 66120b2f52bSLai Jiangshan [N_MEMORY] = _NODE_ATTR(has_memory, N_MEMORY), 66220b2f52bSLai Jiangshan #endif 663fcf07d22SLai Jiangshan [N_CPU] = _NODE_ATTR(has_cpu, N_CPU), 664bde631a5SLee Schermerhorn }; 665bde631a5SLee Schermerhorn 66610fbcf4cSKay Sievers static struct attribute *node_state_attrs[] = { 667fcf07d22SLai Jiangshan &node_state_attr[N_POSSIBLE].attr.attr, 668fcf07d22SLai Jiangshan &node_state_attr[N_ONLINE].attr.attr, 669fcf07d22SLai Jiangshan &node_state_attr[N_NORMAL_MEMORY].attr.attr, 6703701cde6SAndi Kleen #ifdef CONFIG_HIGHMEM 671fcf07d22SLai Jiangshan &node_state_attr[N_HIGH_MEMORY].attr.attr, 6723701cde6SAndi Kleen #endif 67320b2f52bSLai Jiangshan #ifdef CONFIG_MOVABLE_NODE 67420b2f52bSLai Jiangshan &node_state_attr[N_MEMORY].attr.attr, 67520b2f52bSLai Jiangshan #endif 676fcf07d22SLai Jiangshan &node_state_attr[N_CPU].attr.attr, 6773701cde6SAndi Kleen NULL 6783701cde6SAndi Kleen }; 679bde631a5SLee Schermerhorn 68010fbcf4cSKay Sievers static struct attribute_group memory_root_attr_group = { 68110fbcf4cSKay Sievers .attrs = node_state_attrs, 68210fbcf4cSKay Sievers }; 68310fbcf4cSKay Sievers 68410fbcf4cSKay Sievers static const struct attribute_group *cpu_root_attr_groups[] = { 68510fbcf4cSKay Sievers &memory_root_attr_group, 68610fbcf4cSKay Sievers NULL, 68710fbcf4cSKay Sievers }; 68810fbcf4cSKay Sievers 6894faf8d95SLee Schermerhorn #define NODE_CALLBACK_PRI 2 /* lower than SLAB */ 6904b45099bSKeiichiro Tokunaga static int __init register_node_type(void) 6911da177e4SLinus Torvalds { 692bde631a5SLee Schermerhorn int ret; 693bde631a5SLee Schermerhorn 6943701cde6SAndi Kleen BUILD_BUG_ON(ARRAY_SIZE(node_state_attr) != NR_NODE_STATES); 6953701cde6SAndi Kleen BUILD_BUG_ON(ARRAY_SIZE(node_state_attrs)-1 != NR_NODE_STATES); 6963701cde6SAndi Kleen 69710fbcf4cSKay Sievers ret = subsys_system_register(&node_subsys, cpu_root_attr_groups); 6984faf8d95SLee Schermerhorn if (!ret) { 6996e259e7dSAndrew Morton static struct notifier_block node_memory_callback_nb = { 7006e259e7dSAndrew Morton .notifier_call = node_memory_callback, 7016e259e7dSAndrew Morton .priority = NODE_CALLBACK_PRI, 7026e259e7dSAndrew Morton }; 7036e259e7dSAndrew Morton register_hotmemory_notifier(&node_memory_callback_nb); 7044faf8d95SLee Schermerhorn } 705bde631a5SLee Schermerhorn 706bde631a5SLee Schermerhorn /* 707bde631a5SLee Schermerhorn * Note: we're not going to unregister the node class if we fail 708bde631a5SLee Schermerhorn * to register the node state class attribute files. 709bde631a5SLee Schermerhorn */ 710bde631a5SLee Schermerhorn return ret; 7111da177e4SLinus Torvalds } 7121da177e4SLinus Torvalds postcore_initcall(register_node_type); 713