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- // SPDX-License-Identifier: GPL-2.0
- /*
- * Basic Node interface support
- */
- #include <linux/module.h>
- #include <linux/init.h>
- #include <linux/mm.h>
- #include <linux/memory.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>
- static struct bus_type node_subsys = {
- .name = "node",
- .dev_name = "node",
- };
- static ssize_t node_read_cpumap(struct device *dev, bool list, char *buf)
- {
- ssize_t n;
- cpumask_var_t mask;
- struct node *node_dev = to_node(dev);
- /* 2008/04/07: buf currently PAGE_SIZE, need 9 chars per 32 bits. */
- BUILD_BUG_ON((NR_CPUS/32 * 9) > (PAGE_SIZE-1));
- 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_to_pagebuf(list, buf, mask);
- free_cpumask_var(mask);
- return n;
- }
- static inline ssize_t cpumap_show(struct device *dev,
- struct device_attribute *attr,
- char *buf)
- {
- return node_read_cpumap(dev, false, buf);
- }
- static DEVICE_ATTR_RO(cpumap);
- static inline ssize_t cpulist_show(struct device *dev,
- struct device_attribute *attr,
- char *buf)
- {
- return node_read_cpumap(dev, true, buf);
- }
- static DEVICE_ATTR_RO(cpulist);
- /**
- * 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
- * @hmem_attrs: Heterogeneous memory performance attributes
- */
- struct node_access_nodes {
- struct device dev;
- struct list_head list_node;
- unsigned access;
- #ifdef CONFIG_HMEM_REPORTING
- struct node_hmem_attrs hmem_attrs;
- #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,
- };
- 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,
- unsigned 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(sizeof(*access_node), GFP_KERNEL);
- 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(name) \
- static ssize_t name##_show(struct device *dev, \
- struct device_attribute *attr, \
- char *buf) \
- { \
- return sysfs_emit(buf, "%u\n", \
- to_access_nodes(dev)->hmem_attrs.name); \
- } \
- static DEVICE_ATTR_RO(name)
- 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
- * @hmem_attrs: Heterogeneous memory performance attributes
- * @access: The access class the for the given attributes
- */
- void node_set_perf_attrs(unsigned int nid, struct node_hmem_attrs *hmem_attrs,
- unsigned 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->hmem_attrs = *hmem_attrs;
- 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;
- }
- }
- }
- /**
- * 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); \
- } \
- DEVICE_ATTR_RO(name);
- CACHE_ATTR(size, "%llu")
- CACHE_ATTR(line_size, "%u")
- CACHE_ATTR(indexing, "%u")
- CACHE_ATTR(write_policy, "%u")
- static struct attribute *cache_attrs[] = {
- &dev_attr_indexing.attr,
- &dev_attr_size.attr,
- &dev_attr_line_size.attr,
- &dev_attr_write_policy.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(sizeof(*dev), GFP_KERNEL);
- 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(sizeof(*info), GFP_KERNEL);
- 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);
- }
- #else
- static 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;
- 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);
- 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 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(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 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
- ,
- 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(sum_zone_node_page_state(nid, NR_PAGETABLE)),
- nid, 0UL,
- nid, K(sum_zone_node_page_state(nid, NR_BOUNCE)),
- nid, K(node_page_state(pgdat, NR_WRITEBACK_TEMP)),
- 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) *
- HPAGE_PMD_NR),
- nid, K(node_page_state(pgdat, NR_SHMEM_THPS) *
- HPAGE_PMD_NR),
- nid, K(node_page_state(pgdat, NR_SHMEM_PMDMAPPED) *
- HPAGE_PMD_NR),
- nid, K(node_page_state(pgdat, NR_FILE_THPS) *
- HPAGE_PMD_NR),
- nid, K(node_page_state(pgdat, NR_FILE_PMDMAPPED) *
- HPAGE_PMD_NR)
- #endif
- );
- len += hugetlb_report_node_meminfo(buf, len, nid);
- return len;
- }
- #undef K
- static DEVICE_ATTR(meminfo, 0444, node_read_meminfo, NULL);
- static ssize_t node_read_numastat(struct device *dev,
- struct device_attribute *attr, char *buf)
- {
- 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_state(dev->id, NUMA_HIT),
- sum_zone_numa_state(dev->id, NUMA_MISS),
- sum_zone_numa_state(dev->id, NUMA_FOREIGN),
- sum_zone_numa_state(dev->id, NUMA_INTERLEAVE_HIT),
- sum_zone_numa_state(dev->id, NUMA_LOCAL),
- sum_zone_numa_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
- for (i = 0; i < NR_VM_NUMA_STAT_ITEMS; i++)
- len += sysfs_emit_at(buf, len, "%s %lu\n",
- numa_stat_name(i),
- sum_zone_numa_state(nid, i));
- #endif
- for (i = 0; i < NR_VM_NODE_STAT_ITEMS; i++)
- len += sysfs_emit_at(buf, len, "%s %lu\n",
- node_stat_name(i),
- node_page_state_pages(pgdat, i));
- 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_cpumap.attr,
- &dev_attr_cpulist.attr,
- &dev_attr_meminfo.attr,
- &dev_attr_numastat.attr,
- &dev_attr_distance.attr,
- &dev_attr_vmstat.attr,
- NULL
- };
- ATTRIBUTE_GROUPS(node_dev);
- #ifdef CONFIG_HUGETLBFS
- /*
- * hugetlbfs per node attributes registration interface:
- * When/if hugetlb[fs] subsystem initializes [sometime after this module],
- * it will register its per node attributes for all online nodes with
- * memory. It will also call register_hugetlbfs_with_node(), below, to
- * register its attribute registration functions with this node driver.
- * Once these hooks have been initialized, the node driver will call into
- * the hugetlb module to [un]register attributes for hot-plugged nodes.
- */
- static node_registration_func_t __hugetlb_register_node;
- static node_registration_func_t __hugetlb_unregister_node;
- static inline bool hugetlb_register_node(struct node *node)
- {
- if (__hugetlb_register_node &&
- node_state(node->dev.id, N_MEMORY)) {
- __hugetlb_register_node(node);
- return true;
- }
- return false;
- }
- static inline void hugetlb_unregister_node(struct node *node)
- {
- if (__hugetlb_unregister_node)
- __hugetlb_unregister_node(node);
- }
- void register_hugetlbfs_with_node(node_registration_func_t doregister,
- node_registration_func_t unregister)
- {
- __hugetlb_register_node = doregister;
- __hugetlb_unregister_node = unregister;
- }
- #else
- static inline void hugetlb_register_node(struct node *node) {}
- static inline void hugetlb_unregister_node(struct node *node) {}
- #endif
- static void node_device_release(struct device *dev)
- {
- struct node *node = to_node(dev);
- #if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_HUGETLBFS)
- /*
- * We schedule the work only when a memory section is
- * onlined/offlined on this node. When we come here,
- * all the memory on this node has been offlined,
- * so we won't enqueue new work to this work.
- *
- * The work is using node->node_work, so we should
- * flush work before freeing the memory.
- */
- flush_work(&node->node_work);
- #endif
- kfree(node);
- }
- /*
- * register_node - Setup a sysfs device for a node.
- * @num - Node number to use when creating the device.
- *
- * Initialize and register the node device.
- */
- static int register_node(struct node *node, int num)
- {
- int error;
- node->dev.id = num;
- 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);
- else {
- hugetlb_register_node(node);
- compaction_register_node(node);
- }
- return error;
- }
- /**
- * unregister_node - unregister a node device
- * @node: node going away
- *
- * Unregisters a node device @node. All the devices on the node must be
- * unregistered before calling this function.
- */
- void unregister_node(struct node *node)
- {
- hugetlb_unregister_node(node); /* no-op, if memoryless node */
- node_remove_accesses(node);
- node_remove_caches(node);
- device_unregister(&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,
- unsigned 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_HOTPLUG_SPARSE
- static int __ref get_nid_for_pfn(unsigned long pfn)
- {
- if (!pfn_valid_within(pfn))
- return -1;
- #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
- if (system_state < SYSTEM_RUNNING)
- return early_pfn_to_nid(pfn);
- #endif
- return pfn_to_nid(pfn);
- }
- static void do_register_memory_block_under_node(int nid,
- struct memory_block *mem_blk)
- {
- int ret;
- /*
- * If this memory block spans multiple nodes, we only indicate
- * the last processed node.
- */
- mem_blk->nid = nid;
- 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);
- }
- /* register memory section under specified node if it spans that node */
- static int register_mem_block_under_node_early(struct memory_block *mem_blk,
- void *arg)
- {
- unsigned long memory_block_pfns = memory_block_size_bytes() / PAGE_SIZE;
- unsigned long start_pfn = section_nr_to_pfn(mem_blk->start_section_nr);
- unsigned long end_pfn = start_pfn + memory_block_pfns - 1;
- int nid = *(int *)arg;
- unsigned long pfn;
- for (pfn = start_pfn; pfn <= end_pfn; pfn++) {
- int page_nid;
- /*
- * memory block could have several absent sections from start.
- * skip pfn range from absent section
- */
- if (!pfn_in_present_section(pfn)) {
- pfn = round_down(pfn + PAGES_PER_SECTION,
- PAGES_PER_SECTION) - 1;
- continue;
- }
- /*
- * We need to check if page belongs to nid only at the boot
- * case because node's ranges can be interleaved.
- */
- page_nid = get_nid_for_pfn(pfn);
- if (page_nid < 0)
- continue;
- if (page_nid != nid)
- continue;
- do_register_memory_block_under_node(nid, mem_blk);
- return 0;
- }
- /* mem section does not span the specified node */
- return 0;
- }
- /*
- * 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));
- }
- void link_mem_sections(int nid, unsigned long start_pfn, unsigned long end_pfn,
- enum meminit_context context)
- {
- walk_memory_blocks_func_t func;
- if (context == MEMINIT_HOTPLUG)
- func = register_mem_block_under_node_hotplug;
- else
- func = register_mem_block_under_node_early;
- walk_memory_blocks(PFN_PHYS(start_pfn), PFN_PHYS(end_pfn - start_pfn),
- (void *)&nid, func);
- return;
- }
- #ifdef CONFIG_HUGETLBFS
- /*
- * Handle per node hstate attribute [un]registration on transistions
- * to/from memoryless state.
- */
- static void node_hugetlb_work(struct work_struct *work)
- {
- struct node *node = container_of(work, struct node, node_work);
- /*
- * We only get here when a node transitions to/from memoryless state.
- * We can detect which transition occurred by examining whether the
- * node has memory now. hugetlb_register_node() already check this
- * so we try to register the attributes. If that fails, then the
- * node has transitioned to memoryless, try to unregister the
- * attributes.
- */
- if (!hugetlb_register_node(node))
- hugetlb_unregister_node(node);
- }
- static void init_node_hugetlb_work(int nid)
- {
- INIT_WORK(&node_devices[nid]->node_work, node_hugetlb_work);
- }
- static int node_memory_callback(struct notifier_block *self,
- unsigned long action, void *arg)
- {
- struct memory_notify *mnb = arg;
- int nid = mnb->status_change_nid;
- switch (action) {
- case MEM_ONLINE:
- case MEM_OFFLINE:
- /*
- * offload per node hstate [un]registration to a work thread
- * when transitioning to/from memoryless state.
- */
- if (nid != NUMA_NO_NODE)
- schedule_work(&node_devices[nid]->node_work);
- break;
- case MEM_GOING_ONLINE:
- case MEM_GOING_OFFLINE:
- case MEM_CANCEL_ONLINE:
- case MEM_CANCEL_OFFLINE:
- default:
- break;
- }
- return NOTIFY_OK;
- }
- #endif /* CONFIG_HUGETLBFS */
- #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
- #if !defined(CONFIG_MEMORY_HOTPLUG_SPARSE) || \
- !defined(CONFIG_HUGETLBFS)
- static inline int node_memory_callback(struct notifier_block *self,
- unsigned long action, void *arg)
- {
- return NOTIFY_OK;
- }
- static void init_node_hugetlb_work(int nid) { }
- #endif
- int __register_one_node(int nid)
- {
- int error;
- int cpu;
- node_devices[nid] = kzalloc(sizeof(struct node), GFP_KERNEL);
- if (!node_devices[nid])
- return -ENOMEM;
- error = register_node(node_devices[nid], nid);
- /* link cpu under this node */
- for_each_present_cpu(cpu) {
- if (cpu_to_node(cpu) == nid)
- register_cpu_under_node(cpu, nid);
- }
- INIT_LIST_HEAD(&node_devices[nid]->access_list);
- /* initialize work queue for memory hot plug */
- init_node_hugetlb_work(nid);
- node_init_caches(nid);
- return error;
- }
- void unregister_one_node(int nid)
- {
- if (!node_devices[nid])
- return;
- unregister_node(node_devices[nid]);
- 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 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,
- };
- #define NODE_CALLBACK_PRI 2 /* lower than SLAB */
- static int __init register_node_type(void)
- {
- int ret;
- 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) {
- static struct notifier_block node_memory_callback_nb = {
- .notifier_call = node_memory_callback,
- .priority = NODE_CALLBACK_PRI,
- };
- register_hotmemory_notifier(&node_memory_callback_nb);
- }
- /*
- * Note: we're not going to unregister the node class if we fail
- * to register the node state class attribute files.
- */
- return ret;
- }
- postcore_initcall(register_node_type);
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