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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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#include <linux/module.h>#include <linux/init.h>#include <linux/mm.h>#include <linux/memory.h>#include <linux/mempolicy.h>#include <linux/vmstat.h>#include <linux/notifier.h>#include <linux/node.h>#include <linux/hugetlb.h>#include <linux/compaction.h>#include <linux/cpumask.h>#include <linux/topology.h>#include <linux/nodemask.h>#include <linux/cpu.h>#include <linux/device.h>#include <linux/pm_runtime.h>#include <linux/swap.h>#include <linux/slab.h>#include <linux/memblock.h>
static const struct bus_type node_subsys = { .name = "node", .dev_name = "node",};
static inline ssize_t cpumap_read(struct file *file, struct kobject *kobj, const struct bin_attribute *attr, char *buf, loff_t off, size_t count){ struct device *dev = kobj_to_dev(kobj); struct node *node_dev = to_node(dev); cpumask_var_t mask; ssize_t n;
if (!alloc_cpumask_var(&mask, GFP_KERNEL)) return 0;
cpumask_and(mask, cpumask_of_node(node_dev->dev.id), cpu_online_mask); n = cpumap_print_bitmask_to_buf(buf, mask, off, count); free_cpumask_var(mask);
return n;}
static const BIN_ATTR_RO(cpumap, CPUMAP_FILE_MAX_BYTES);
static inline ssize_t cpulist_read(struct file *file, struct kobject *kobj, const struct bin_attribute *attr, char *buf, loff_t off, size_t count){ struct device *dev = kobj_to_dev(kobj); struct node *node_dev = to_node(dev); cpumask_var_t mask; ssize_t n;
if (!alloc_cpumask_var(&mask, GFP_KERNEL)) return 0;
cpumask_and(mask, cpumask_of_node(node_dev->dev.id), cpu_online_mask); n = cpumap_print_list_to_buf(buf, mask, off, count); free_cpumask_var(mask);
return n;}
static const BIN_ATTR_RO(cpulist, CPULIST_FILE_MAX_BYTES);
/** * struct node_access_nodes - Access class device to hold user visible * relationships to other nodes. * @dev: Device for this memory access class * @list_node: List element in the node's access list * @access: The access class rank * @coord: Heterogeneous memory performance coordinates */struct node_access_nodes { struct device dev; struct list_head list_node; unsigned int access;#ifdef CONFIG_HMEM_REPORTING struct access_coordinate coord;#endif};#define to_access_nodes(dev) container_of(dev, struct node_access_nodes, dev)
static struct attribute *node_init_access_node_attrs[] = { NULL,};
static struct attribute *node_targ_access_node_attrs[] = { NULL,};
static const struct attribute_group initiators = { .name = "initiators", .attrs = node_init_access_node_attrs,};
static const struct attribute_group targets = { .name = "targets", .attrs = node_targ_access_node_attrs,};
static const struct attribute_group *node_access_node_groups[] = { &initiators, &targets, NULL,};
#ifdef CONFIG_MEMORY_HOTPLUGstatic BLOCKING_NOTIFIER_HEAD(node_chain);
int register_node_notifier(struct notifier_block *nb){ return blocking_notifier_chain_register(&node_chain, nb);}EXPORT_SYMBOL(register_node_notifier);
void unregister_node_notifier(struct notifier_block *nb){ blocking_notifier_chain_unregister(&node_chain, nb);}EXPORT_SYMBOL(unregister_node_notifier);
int node_notify(unsigned long val, void *v){ return blocking_notifier_call_chain(&node_chain, val, v);}#endif
static void node_remove_accesses(struct node *node){ struct node_access_nodes *c, *cnext;
list_for_each_entry_safe(c, cnext, &node->access_list, list_node) { list_del(&c->list_node); device_unregister(&c->dev); }}
static void node_access_release(struct device *dev){ kfree(to_access_nodes(dev));}
static struct node_access_nodes *node_init_node_access(struct node *node, enum access_coordinate_class access){ struct node_access_nodes *access_node; struct device *dev;
list_for_each_entry(access_node, &node->access_list, list_node) if (access_node->access == access) return access_node;
access_node = kzalloc_obj(*access_node); if (!access_node) return NULL;
access_node->access = access; dev = &access_node->dev; dev->parent = &node->dev; dev->release = node_access_release; dev->groups = node_access_node_groups; if (dev_set_name(dev, "access%u", access)) goto free;
if (device_register(dev)) goto free_name;
pm_runtime_no_callbacks(dev); list_add_tail(&access_node->list_node, &node->access_list); return access_node;free_name: kfree_const(dev->kobj.name);free: kfree(access_node); return NULL;}
#ifdef CONFIG_HMEM_REPORTING#define ACCESS_ATTR(property) \static ssize_t property##_show(struct device *dev, \ struct device_attribute *attr, \ char *buf) \{ \ return sysfs_emit(buf, "%u\n", \ to_access_nodes(dev)->coord.property); \} \static DEVICE_ATTR_RO(property)
ACCESS_ATTR(read_bandwidth);ACCESS_ATTR(read_latency);ACCESS_ATTR(write_bandwidth);ACCESS_ATTR(write_latency);
static struct attribute *access_attrs[] = { &dev_attr_read_bandwidth.attr, &dev_attr_read_latency.attr, &dev_attr_write_bandwidth.attr, &dev_attr_write_latency.attr, NULL,};
/** * node_set_perf_attrs - Set the performance values for given access class * @nid: Node identifier to be set * @coord: Heterogeneous memory performance coordinates * @access: The access class the for the given attributes */void node_set_perf_attrs(unsigned int nid, struct access_coordinate *coord, enum access_coordinate_class access){ struct node_access_nodes *c; struct node *node; int i;
if (WARN_ON_ONCE(!node_online(nid))) return;
node = node_devices[nid]; c = node_init_node_access(node, access); if (!c) return;
c->coord = *coord; for (i = 0; access_attrs[i] != NULL; i++) { if (sysfs_add_file_to_group(&c->dev.kobj, access_attrs[i], "initiators")) { pr_info("failed to add performance attribute to node %d\n", nid); break; } }
/* When setting CPU access coordinates, update mempolicy */ if (access == ACCESS_COORDINATE_CPU) { if (mempolicy_set_node_perf(nid, coord)) { pr_info("failed to set mempolicy attrs for node %d\n", nid); } }}EXPORT_SYMBOL_GPL(node_set_perf_attrs);
/** * node_update_perf_attrs - Update the performance values for given access class * @nid: Node identifier to be updated * @coord: Heterogeneous memory performance coordinates * @access: The access class for the given attributes */void node_update_perf_attrs(unsigned int nid, struct access_coordinate *coord, enum access_coordinate_class access){ struct node_access_nodes *access_node; struct node *node; int i;
if (WARN_ON_ONCE(!node_online(nid))) return;
node = node_devices[nid]; list_for_each_entry(access_node, &node->access_list, list_node) { if (access_node->access != access) continue;
access_node->coord = *coord; for (i = 0; access_attrs[i]; i++) { sysfs_notify(&access_node->dev.kobj, NULL, access_attrs[i]->name); } break; }
/* When setting CPU access coordinates, update mempolicy */ if (access != ACCESS_COORDINATE_CPU) return;
if (mempolicy_set_node_perf(nid, coord)) pr_info("failed to set mempolicy attrs for node %d\n", nid);}EXPORT_SYMBOL_GPL(node_update_perf_attrs);
/** * struct node_cache_info - Internal tracking for memory node caches * @dev: Device represeting the cache level * @node: List element for tracking in the node * @cache_attrs:Attributes for this cache level */struct node_cache_info { struct device dev; struct list_head node; struct node_cache_attrs cache_attrs;};#define to_cache_info(device) container_of(device, struct node_cache_info, dev)
#define CACHE_ATTR(name, fmt) \static ssize_t name##_show(struct device *dev, \ struct device_attribute *attr, \ char *buf) \{ \ return sysfs_emit(buf, fmt "\n", \ to_cache_info(dev)->cache_attrs.name); \} \static DEVICE_ATTR_RO(name);
CACHE_ATTR(size, "%llu")CACHE_ATTR(line_size, "%u")CACHE_ATTR(indexing, "%u")CACHE_ATTR(write_policy, "%u")CACHE_ATTR(address_mode, "%#x")
static struct attribute *cache_attrs[] = { &dev_attr_indexing.attr, &dev_attr_size.attr, &dev_attr_line_size.attr, &dev_attr_write_policy.attr, &dev_attr_address_mode.attr, NULL,};ATTRIBUTE_GROUPS(cache);
static void node_cache_release(struct device *dev){ kfree(dev);}
static void node_cacheinfo_release(struct device *dev){ struct node_cache_info *info = to_cache_info(dev); kfree(info);}
static void node_init_cache_dev(struct node *node){ struct device *dev;
dev = kzalloc_obj(*dev); if (!dev) return;
device_initialize(dev); dev->parent = &node->dev; dev->release = node_cache_release; if (dev_set_name(dev, "memory_side_cache")) goto put_device;
if (device_add(dev)) goto put_device;
pm_runtime_no_callbacks(dev); node->cache_dev = dev; return;put_device: put_device(dev);}
/** * node_add_cache() - add cache attribute to a memory node * @nid: Node identifier that has new cache attributes * @cache_attrs: Attributes for the cache being added */void node_add_cache(unsigned int nid, struct node_cache_attrs *cache_attrs){ struct node_cache_info *info; struct device *dev; struct node *node;
if (!node_online(nid) || !node_devices[nid]) return;
node = node_devices[nid]; list_for_each_entry(info, &node->cache_attrs, node) { if (info->cache_attrs.level == cache_attrs->level) { dev_warn(&node->dev, "attempt to add duplicate cache level:%d\n", cache_attrs->level); return; } }
if (!node->cache_dev) node_init_cache_dev(node); if (!node->cache_dev) return;
info = kzalloc_obj(*info); if (!info) return;
dev = &info->dev; device_initialize(dev); dev->parent = node->cache_dev; dev->release = node_cacheinfo_release; dev->groups = cache_groups; if (dev_set_name(dev, "index%d", cache_attrs->level)) goto put_device;
info->cache_attrs = *cache_attrs; if (device_add(dev)) { dev_warn(&node->dev, "failed to add cache level:%d\n", cache_attrs->level); goto put_device; } pm_runtime_no_callbacks(dev); list_add_tail(&info->node, &node->cache_attrs); return;put_device: put_device(dev);}
static void node_remove_caches(struct node *node){ struct node_cache_info *info, *next;
if (!node->cache_dev) return;
list_for_each_entry_safe(info, next, &node->cache_attrs, node) { list_del(&info->node); device_unregister(&info->dev); } device_unregister(node->cache_dev);}
static void node_init_caches(unsigned int nid){ INIT_LIST_HEAD(&node_devices[nid]->cache_attrs);}#elsestatic void node_init_caches(unsigned int nid) { }static void node_remove_caches(struct node *node) { }#endif
#define K(x) ((x) << (PAGE_SHIFT - 10))static ssize_t node_read_meminfo(struct device *dev, struct device_attribute *attr, char *buf){ int len = 0; int nid = dev->id; struct pglist_data *pgdat = NODE_DATA(nid); struct sysinfo i; unsigned long sreclaimable, sunreclaimable; unsigned long swapcached = 0;
si_meminfo_node(&i, nid); sreclaimable = node_page_state_pages(pgdat, NR_SLAB_RECLAIMABLE_B); sunreclaimable = node_page_state_pages(pgdat, NR_SLAB_UNRECLAIMABLE_B);#ifdef CONFIG_SWAP swapcached = node_page_state_pages(pgdat, NR_SWAPCACHE);#endif len = sysfs_emit_at(buf, len, "Node %d MemTotal: %8lu kB\n" "Node %d MemFree: %8lu kB\n" "Node %d MemUsed: %8lu kB\n" "Node %d SwapCached: %8lu kB\n" "Node %d Active: %8lu kB\n" "Node %d Inactive: %8lu kB\n" "Node %d Active(anon): %8lu kB\n" "Node %d Inactive(anon): %8lu kB\n" "Node %d Active(file): %8lu kB\n" "Node %d Inactive(file): %8lu kB\n" "Node %d Unevictable: %8lu kB\n" "Node %d Mlocked: %8lu kB\n", nid, K(i.totalram), nid, K(i.freeram), nid, K(i.totalram - i.freeram), nid, K(swapcached), nid, K(node_page_state(pgdat, NR_ACTIVE_ANON) + node_page_state(pgdat, NR_ACTIVE_FILE)), nid, K(node_page_state(pgdat, NR_INACTIVE_ANON) + node_page_state(pgdat, NR_INACTIVE_FILE)), nid, K(node_page_state(pgdat, NR_ACTIVE_ANON)), nid, K(node_page_state(pgdat, NR_INACTIVE_ANON)), nid, K(node_page_state(pgdat, NR_ACTIVE_FILE)), nid, K(node_page_state(pgdat, NR_INACTIVE_FILE)), nid, K(node_page_state(pgdat, NR_UNEVICTABLE)), nid, K(sum_zone_node_page_state(nid, NR_MLOCK)));
#ifdef CONFIG_HIGHMEM len += sysfs_emit_at(buf, len, "Node %d HighTotal: %8lu kB\n" "Node %d HighFree: %8lu kB\n" "Node %d LowTotal: %8lu kB\n" "Node %d LowFree: %8lu kB\n", nid, K(i.totalhigh), nid, K(i.freehigh), nid, K(i.totalram - i.totalhigh), nid, K(i.freeram - i.freehigh));#endif len += sysfs_emit_at(buf, len, "Node %d Dirty: %8lu kB\n" "Node %d Writeback: %8lu kB\n" "Node %d FilePages: %8lu kB\n" "Node %d Mapped: %8lu kB\n" "Node %d AnonPages: %8lu kB\n" "Node %d Shmem: %8lu kB\n" "Node %d KernelStack: %8lu kB\n"#ifdef CONFIG_SHADOW_CALL_STACK "Node %d ShadowCallStack:%8lu kB\n"#endif "Node %d PageTables: %8lu kB\n" "Node %d SecPageTables: %8lu kB\n" "Node %d NFS_Unstable: %8lu kB\n" "Node %d Bounce: %8lu kB\n" "Node %d WritebackTmp: %8lu kB\n" "Node %d KReclaimable: %8lu kB\n" "Node %d Slab: %8lu kB\n" "Node %d SReclaimable: %8lu kB\n" "Node %d SUnreclaim: %8lu kB\n"#ifdef CONFIG_TRANSPARENT_HUGEPAGE "Node %d AnonHugePages: %8lu kB\n" "Node %d ShmemHugePages: %8lu kB\n" "Node %d ShmemPmdMapped: %8lu kB\n" "Node %d FileHugePages: %8lu kB\n" "Node %d FilePmdMapped: %8lu kB\n"#endif#ifdef CONFIG_UNACCEPTED_MEMORY "Node %d Unaccepted: %8lu kB\n"#endif "Node %d Balloon: %8lu kB\n" "Node %d GPUActive: %8lu kB\n" "Node %d GPUReclaim: %8lu kB\n" , nid, K(node_page_state(pgdat, NR_FILE_DIRTY)), nid, K(node_page_state(pgdat, NR_WRITEBACK)), nid, K(node_page_state(pgdat, NR_FILE_PAGES)), nid, K(node_page_state(pgdat, NR_FILE_MAPPED)), nid, K(node_page_state(pgdat, NR_ANON_MAPPED)), nid, K(i.sharedram), nid, node_page_state(pgdat, NR_KERNEL_STACK_KB),#ifdef CONFIG_SHADOW_CALL_STACK nid, node_page_state(pgdat, NR_KERNEL_SCS_KB),#endif nid, K(node_page_state(pgdat, NR_PAGETABLE)), nid, K(node_page_state(pgdat, NR_SECONDARY_PAGETABLE)), nid, 0UL, nid, 0UL, nid, 0UL, nid, K(sreclaimable + node_page_state(pgdat, NR_KERNEL_MISC_RECLAIMABLE)), nid, K(sreclaimable + sunreclaimable), nid, K(sreclaimable), nid, K(sunreclaimable)#ifdef CONFIG_TRANSPARENT_HUGEPAGE , nid, K(node_page_state(pgdat, NR_ANON_THPS)), nid, K(node_page_state(pgdat, NR_SHMEM_THPS)), nid, K(node_page_state(pgdat, NR_SHMEM_PMDMAPPED)), nid, K(node_page_state(pgdat, NR_FILE_THPS)), nid, K(node_page_state(pgdat, NR_FILE_PMDMAPPED))#endif#ifdef CONFIG_UNACCEPTED_MEMORY , nid, K(sum_zone_node_page_state(nid, NR_UNACCEPTED))#endif , nid, K(node_page_state(pgdat, NR_BALLOON_PAGES)), nid, K(node_page_state(pgdat, NR_GPU_ACTIVE)), nid, K(node_page_state(pgdat, NR_GPU_RECLAIM)) ); len += hugetlb_report_node_meminfo(buf, len, nid); return len;}
#undef Kstatic DEVICE_ATTR(meminfo, 0444, node_read_meminfo, NULL);
static ssize_t node_read_numastat(struct device *dev, struct device_attribute *attr, char *buf){ fold_vm_numa_events(); return sysfs_emit(buf, "numa_hit %lu\n" "numa_miss %lu\n" "numa_foreign %lu\n" "interleave_hit %lu\n" "local_node %lu\n" "other_node %lu\n", sum_zone_numa_event_state(dev->id, NUMA_HIT), sum_zone_numa_event_state(dev->id, NUMA_MISS), sum_zone_numa_event_state(dev->id, NUMA_FOREIGN), sum_zone_numa_event_state(dev->id, NUMA_INTERLEAVE_HIT), sum_zone_numa_event_state(dev->id, NUMA_LOCAL), sum_zone_numa_event_state(dev->id, NUMA_OTHER));}static DEVICE_ATTR(numastat, 0444, node_read_numastat, NULL);
static ssize_t node_read_vmstat(struct device *dev, struct device_attribute *attr, char *buf){ int nid = dev->id; struct pglist_data *pgdat = NODE_DATA(nid); int i; int len = 0;
for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) len += sysfs_emit_at(buf, len, "%s %lu\n", zone_stat_name(i), sum_zone_node_page_state(nid, i));
#ifdef CONFIG_NUMA fold_vm_numa_events(); for (i = 0; i < NR_VM_NUMA_EVENT_ITEMS; i++) len += sysfs_emit_at(buf, len, "%s %lu\n", numa_stat_name(i), sum_zone_numa_event_state(nid, i));
#endif for (i = 0; i < NR_VM_NODE_STAT_ITEMS; i++) { unsigned long pages = node_page_state_pages(pgdat, i);
if (vmstat_item_print_in_thp(i)) pages /= HPAGE_PMD_NR; len += sysfs_emit_at(buf, len, "%s %lu\n", node_stat_name(i), pages); }
return len;}static DEVICE_ATTR(vmstat, 0444, node_read_vmstat, NULL);
static ssize_t node_read_distance(struct device *dev, struct device_attribute *attr, char *buf){ int nid = dev->id; int len = 0; int i;
/* * buf is currently PAGE_SIZE in length and each node needs 4 chars * at the most (distance + space or newline). */ BUILD_BUG_ON(MAX_NUMNODES * 4 > PAGE_SIZE);
for_each_online_node(i) { len += sysfs_emit_at(buf, len, "%s%d", i ? " " : "", node_distance(nid, i)); }
len += sysfs_emit_at(buf, len, "\n"); return len;}static DEVICE_ATTR(distance, 0444, node_read_distance, NULL);
static struct attribute *node_dev_attrs[] = { &dev_attr_meminfo.attr, &dev_attr_numastat.attr, &dev_attr_distance.attr, &dev_attr_vmstat.attr, NULL};
static const struct bin_attribute *node_dev_bin_attrs[] = { &bin_attr_cpumap, &bin_attr_cpulist, NULL};
static const struct attribute_group node_dev_group = { .attrs = node_dev_attrs, .bin_attrs = node_dev_bin_attrs,};
static const struct attribute_group *node_dev_groups[] = { &node_dev_group,#ifdef CONFIG_HAVE_ARCH_NODE_DEV_GROUP &arch_node_dev_group,#endif#ifdef CONFIG_MEMORY_FAILURE &memory_failure_attr_group,#endif NULL};
static void node_device_release(struct device *dev){ kfree(to_node(dev));}
struct node *node_devices[MAX_NUMNODES];
/* * register cpu under node */int register_cpu_under_node(unsigned int cpu, unsigned int nid){ int ret; struct device *obj;
if (!node_online(nid)) return 0;
obj = get_cpu_device(cpu); if (!obj) return 0;
ret = sysfs_create_link(&node_devices[nid]->dev.kobj, &obj->kobj, kobject_name(&obj->kobj)); if (ret) return ret;
return sysfs_create_link(&obj->kobj, &node_devices[nid]->dev.kobj, kobject_name(&node_devices[nid]->dev.kobj));}
/** * register_memory_node_under_compute_node - link memory node to its compute * node for a given access class. * @mem_nid: Memory node number * @cpu_nid: Cpu node number * @access: Access class to register * * Description: * For use with platforms that may have separate memory and compute nodes. * This function will export node relationships linking which memory * initiator nodes can access memory targets at a given ranked access * class. */int register_memory_node_under_compute_node(unsigned int mem_nid, unsigned int cpu_nid, enum access_coordinate_class access){ struct node *init_node, *targ_node; struct node_access_nodes *initiator, *target; int ret;
if (!node_online(cpu_nid) || !node_online(mem_nid)) return -ENODEV;
init_node = node_devices[cpu_nid]; targ_node = node_devices[mem_nid]; initiator = node_init_node_access(init_node, access); target = node_init_node_access(targ_node, access); if (!initiator || !target) return -ENOMEM;
ret = sysfs_add_link_to_group(&initiator->dev.kobj, "targets", &targ_node->dev.kobj, dev_name(&targ_node->dev)); if (ret) return ret;
ret = sysfs_add_link_to_group(&target->dev.kobj, "initiators", &init_node->dev.kobj, dev_name(&init_node->dev)); if (ret) goto err;
return 0; err: sysfs_remove_link_from_group(&initiator->dev.kobj, "targets", dev_name(&targ_node->dev)); return ret;}
int unregister_cpu_under_node(unsigned int cpu, unsigned int nid){ struct device *obj;
if (!node_online(nid)) return 0;
obj = get_cpu_device(cpu); if (!obj) return 0;
sysfs_remove_link(&node_devices[nid]->dev.kobj, kobject_name(&obj->kobj)); sysfs_remove_link(&obj->kobj, kobject_name(&node_devices[nid]->dev.kobj));
return 0;}
#ifdef CONFIG_MEMORY_HOTPLUGstatic void do_register_memory_block_under_node(int nid, struct memory_block *mem_blk){ int ret;
ret = sysfs_create_link_nowarn(&node_devices[nid]->dev.kobj, &mem_blk->dev.kobj, kobject_name(&mem_blk->dev.kobj)); if (ret && ret != -EEXIST) dev_err_ratelimited(&node_devices[nid]->dev, "can't create link to %s in sysfs (%d)\n", kobject_name(&mem_blk->dev.kobj), ret);
ret = sysfs_create_link_nowarn(&mem_blk->dev.kobj, &node_devices[nid]->dev.kobj, kobject_name(&node_devices[nid]->dev.kobj)); if (ret && ret != -EEXIST) dev_err_ratelimited(&mem_blk->dev, "can't create link to %s in sysfs (%d)\n", kobject_name(&node_devices[nid]->dev.kobj), ret);}
/* * During hotplug we know that all pages in the memory block belong to the same * node. */static int register_mem_block_under_node_hotplug(struct memory_block *mem_blk, void *arg){ int nid = *(int *)arg;
do_register_memory_block_under_node(nid, mem_blk); return 0;}
/* * Unregister a memory block device under the node it spans. Memory blocks * with multiple nodes cannot be offlined and therefore also never be removed. */void unregister_memory_block_under_nodes(struct memory_block *mem_blk){ if (mem_blk->nid == NUMA_NO_NODE) return;
sysfs_remove_link(&node_devices[mem_blk->nid]->dev.kobj, kobject_name(&mem_blk->dev.kobj)); sysfs_remove_link(&mem_blk->dev.kobj, kobject_name(&node_devices[mem_blk->nid]->dev.kobj));}
/* register all memory blocks under the corresponding nodes */static void register_memory_blocks_under_nodes(void){ struct memblock_region *r;
for_each_mem_region(r) { const unsigned long start_block_id = phys_to_block_id(r->base); const unsigned long end_block_id = phys_to_block_id(r->base + r->size - 1); const int nid = memblock_get_region_node(r); unsigned long block_id;
if (!node_online(nid)) continue;
for (block_id = start_block_id; block_id <= end_block_id; block_id++) { struct memory_block *mem;
mem = memory_block_get(block_id); if (!mem) continue;
memory_block_add_nid_early(mem, nid); do_register_memory_block_under_node(nid, mem); memory_block_put(mem); }
}}
void register_memory_blocks_under_node_hotplug(int nid, unsigned long start_pfn, unsigned long end_pfn){ walk_memory_blocks(PFN_PHYS(start_pfn), PFN_PHYS(end_pfn - start_pfn), (void *)&nid, register_mem_block_under_node_hotplug); return;}#endif /* CONFIG_MEMORY_HOTPLUG */
/** * register_node - Initialize and register the node device. * @nid: Node number to use when creating the device. * * Return: 0 on success, -errno otherwise */int register_node(int nid){ int error; int cpu; struct node *node;
node = kzalloc_obj(struct node); if (!node) return -ENOMEM;
INIT_LIST_HEAD(&node->access_list);
node->dev.id = nid; node->dev.bus = &node_subsys; node->dev.release = node_device_release; node->dev.groups = node_dev_groups;
error = device_register(&node->dev); if (error) { put_device(&node->dev); return error; }
node_devices[nid] = node; hugetlb_register_node(node); compaction_register_node(node); reclaim_register_node(node);
/* link cpu under this node */ for_each_present_cpu(cpu) { if (cpu_to_node(cpu) == nid) register_cpu_under_node(cpu, nid); }
node_init_caches(nid);
return error;}/** * unregister_node - unregister a node device * @nid: nid of the node going away * * Unregisters the node device at node id @nid. All the devices on the * node must be unregistered before calling this function. */void unregister_node(int nid){ struct node *node = node_devices[nid];
if (!node) return;
hugetlb_unregister_node(node); compaction_unregister_node(node); reclaim_unregister_node(node); node_remove_accesses(node); node_remove_caches(node); device_unregister(&node->dev); node_devices[nid] = NULL;}
/* * node states attributes */
struct node_attr { struct device_attribute attr; enum node_states state;};
static ssize_t show_node_state(struct device *dev, struct device_attribute *attr, char *buf){ struct node_attr *na = container_of(attr, struct node_attr, attr);
return sysfs_emit(buf, "%*pbl\n", nodemask_pr_args(&node_states[na->state]));}
#define _NODE_ATTR(name, state) \ { __ATTR(name, 0444, show_node_state, NULL), state }
static struct node_attr node_state_attr[] = { [N_POSSIBLE] = _NODE_ATTR(possible, N_POSSIBLE), [N_ONLINE] = _NODE_ATTR(online, N_ONLINE), [N_NORMAL_MEMORY] = _NODE_ATTR(has_normal_memory, N_NORMAL_MEMORY),#ifdef CONFIG_HIGHMEM [N_HIGH_MEMORY] = _NODE_ATTR(has_high_memory, N_HIGH_MEMORY),#endif [N_MEMORY] = _NODE_ATTR(has_memory, N_MEMORY), [N_CPU] = _NODE_ATTR(has_cpu, N_CPU), [N_GENERIC_INITIATOR] = _NODE_ATTR(has_generic_initiator, N_GENERIC_INITIATOR),};
static struct attribute *node_state_attrs[] = { &node_state_attr[N_POSSIBLE].attr.attr, &node_state_attr[N_ONLINE].attr.attr, &node_state_attr[N_NORMAL_MEMORY].attr.attr,#ifdef CONFIG_HIGHMEM &node_state_attr[N_HIGH_MEMORY].attr.attr,#endif &node_state_attr[N_MEMORY].attr.attr, &node_state_attr[N_CPU].attr.attr, &node_state_attr[N_GENERIC_INITIATOR].attr.attr, NULL};
static const struct attribute_group memory_root_attr_group = { .attrs = node_state_attrs,};
static const struct attribute_group *cpu_root_attr_groups[] = { &memory_root_attr_group, NULL,};
void __init node_dev_init(void){ int ret, i;
BUILD_BUG_ON(ARRAY_SIZE(node_state_attr) != NR_NODE_STATES); BUILD_BUG_ON(ARRAY_SIZE(node_state_attrs)-1 != NR_NODE_STATES);
ret = subsys_system_register(&node_subsys, cpu_root_attr_groups); if (ret) panic("%s() failed to register subsystem: %d\n", __func__, ret);
/* * Create all node devices, which will properly link the node * to already created cpu devices. */ for_each_online_node(i) { ret = register_node(i); if (ret) panic("%s() failed to add node: %d\n", __func__, ret); }
register_memory_blocks_under_nodes();}