1024 строки
27 KiB
C
1024 строки
27 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Basic Node interface support
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/mm.h>
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#include <linux/memory.h>
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#include <linux/vmstat.h>
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#include <linux/notifier.h>
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#include <linux/node.h>
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#include <linux/hugetlb.h>
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#include <linux/compaction.h>
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#include <linux/cpumask.h>
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#include <linux/topology.h>
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#include <linux/nodemask.h>
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#include <linux/cpu.h>
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#include <linux/device.h>
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#include <linux/pm_runtime.h>
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#include <linux/swap.h>
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#include <linux/slab.h>
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static struct bus_type node_subsys = {
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.name = "node",
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.dev_name = "node",
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};
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static ssize_t node_read_cpumap(struct device *dev, bool list, char *buf)
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{
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ssize_t n;
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cpumask_var_t mask;
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struct node *node_dev = to_node(dev);
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/* 2008/04/07: buf currently PAGE_SIZE, need 9 chars per 32 bits. */
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BUILD_BUG_ON((NR_CPUS/32 * 9) > (PAGE_SIZE-1));
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if (!alloc_cpumask_var(&mask, GFP_KERNEL))
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return 0;
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cpumask_and(mask, cpumask_of_node(node_dev->dev.id), cpu_online_mask);
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n = cpumap_print_to_pagebuf(list, buf, mask);
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free_cpumask_var(mask);
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return n;
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}
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static inline ssize_t node_read_cpumask(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return node_read_cpumap(dev, false, buf);
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}
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static inline ssize_t node_read_cpulist(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return node_read_cpumap(dev, true, buf);
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}
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static DEVICE_ATTR(cpumap, S_IRUGO, node_read_cpumask, NULL);
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static DEVICE_ATTR(cpulist, S_IRUGO, node_read_cpulist, NULL);
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/**
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* struct node_access_nodes - Access class device to hold user visible
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* relationships to other nodes.
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* @dev: Device for this memory access class
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* @list_node: List element in the node's access list
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* @access: The access class rank
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* @hmem_attrs: Heterogeneous memory performance attributes
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*/
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struct node_access_nodes {
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struct device dev;
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struct list_head list_node;
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unsigned access;
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#ifdef CONFIG_HMEM_REPORTING
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struct node_hmem_attrs hmem_attrs;
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#endif
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};
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#define to_access_nodes(dev) container_of(dev, struct node_access_nodes, dev)
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static struct attribute *node_init_access_node_attrs[] = {
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NULL,
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};
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static struct attribute *node_targ_access_node_attrs[] = {
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NULL,
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};
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static const struct attribute_group initiators = {
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.name = "initiators",
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.attrs = node_init_access_node_attrs,
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};
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static const struct attribute_group targets = {
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.name = "targets",
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.attrs = node_targ_access_node_attrs,
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};
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static const struct attribute_group *node_access_node_groups[] = {
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&initiators,
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&targets,
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NULL,
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};
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static void node_remove_accesses(struct node *node)
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{
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struct node_access_nodes *c, *cnext;
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list_for_each_entry_safe(c, cnext, &node->access_list, list_node) {
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list_del(&c->list_node);
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device_unregister(&c->dev);
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}
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}
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static void node_access_release(struct device *dev)
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{
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kfree(to_access_nodes(dev));
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}
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static struct node_access_nodes *node_init_node_access(struct node *node,
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unsigned access)
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{
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struct node_access_nodes *access_node;
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struct device *dev;
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list_for_each_entry(access_node, &node->access_list, list_node)
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if (access_node->access == access)
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return access_node;
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access_node = kzalloc(sizeof(*access_node), GFP_KERNEL);
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if (!access_node)
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return NULL;
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access_node->access = access;
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dev = &access_node->dev;
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dev->parent = &node->dev;
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dev->release = node_access_release;
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dev->groups = node_access_node_groups;
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if (dev_set_name(dev, "access%u", access))
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goto free;
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if (device_register(dev))
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goto free_name;
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pm_runtime_no_callbacks(dev);
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list_add_tail(&access_node->list_node, &node->access_list);
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return access_node;
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free_name:
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kfree_const(dev->kobj.name);
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free:
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kfree(access_node);
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return NULL;
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}
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#ifdef CONFIG_HMEM_REPORTING
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#define ACCESS_ATTR(name) \
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static ssize_t name##_show(struct device *dev, \
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struct device_attribute *attr, \
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char *buf) \
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{ \
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return sprintf(buf, "%u\n", to_access_nodes(dev)->hmem_attrs.name); \
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} \
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static DEVICE_ATTR_RO(name);
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ACCESS_ATTR(read_bandwidth)
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ACCESS_ATTR(read_latency)
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ACCESS_ATTR(write_bandwidth)
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ACCESS_ATTR(write_latency)
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static struct attribute *access_attrs[] = {
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&dev_attr_read_bandwidth.attr,
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&dev_attr_read_latency.attr,
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&dev_attr_write_bandwidth.attr,
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&dev_attr_write_latency.attr,
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NULL,
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};
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/**
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* node_set_perf_attrs - Set the performance values for given access class
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* @nid: Node identifier to be set
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* @hmem_attrs: Heterogeneous memory performance attributes
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* @access: The access class the for the given attributes
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*/
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void node_set_perf_attrs(unsigned int nid, struct node_hmem_attrs *hmem_attrs,
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unsigned access)
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{
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struct node_access_nodes *c;
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struct node *node;
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int i;
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if (WARN_ON_ONCE(!node_online(nid)))
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return;
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node = node_devices[nid];
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c = node_init_node_access(node, access);
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if (!c)
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return;
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c->hmem_attrs = *hmem_attrs;
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for (i = 0; access_attrs[i] != NULL; i++) {
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if (sysfs_add_file_to_group(&c->dev.kobj, access_attrs[i],
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"initiators")) {
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pr_info("failed to add performance attribute to node %d\n",
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nid);
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break;
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}
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}
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}
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/**
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* struct node_cache_info - Internal tracking for memory node caches
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* @dev: Device represeting the cache level
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* @node: List element for tracking in the node
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* @cache_attrs:Attributes for this cache level
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*/
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struct node_cache_info {
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struct device dev;
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struct list_head node;
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struct node_cache_attrs cache_attrs;
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};
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#define to_cache_info(device) container_of(device, struct node_cache_info, dev)
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#define CACHE_ATTR(name, fmt) \
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static ssize_t name##_show(struct device *dev, \
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struct device_attribute *attr, \
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char *buf) \
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{ \
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return sprintf(buf, fmt "\n", to_cache_info(dev)->cache_attrs.name);\
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} \
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DEVICE_ATTR_RO(name);
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CACHE_ATTR(size, "%llu")
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CACHE_ATTR(line_size, "%u")
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CACHE_ATTR(indexing, "%u")
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CACHE_ATTR(write_policy, "%u")
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static struct attribute *cache_attrs[] = {
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&dev_attr_indexing.attr,
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&dev_attr_size.attr,
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&dev_attr_line_size.attr,
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&dev_attr_write_policy.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(cache);
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static void node_cache_release(struct device *dev)
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{
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kfree(dev);
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}
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static void node_cacheinfo_release(struct device *dev)
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{
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struct node_cache_info *info = to_cache_info(dev);
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kfree(info);
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}
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static void node_init_cache_dev(struct node *node)
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{
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struct device *dev;
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dev = kzalloc(sizeof(*dev), GFP_KERNEL);
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if (!dev)
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return;
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dev->parent = &node->dev;
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dev->release = node_cache_release;
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if (dev_set_name(dev, "memory_side_cache"))
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goto free_dev;
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if (device_register(dev))
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goto free_name;
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pm_runtime_no_callbacks(dev);
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node->cache_dev = dev;
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return;
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free_name:
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kfree_const(dev->kobj.name);
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free_dev:
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kfree(dev);
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}
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/**
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* node_add_cache() - add cache attribute to a memory node
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* @nid: Node identifier that has new cache attributes
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* @cache_attrs: Attributes for the cache being added
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*/
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void node_add_cache(unsigned int nid, struct node_cache_attrs *cache_attrs)
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{
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struct node_cache_info *info;
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struct device *dev;
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struct node *node;
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if (!node_online(nid) || !node_devices[nid])
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return;
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node = node_devices[nid];
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list_for_each_entry(info, &node->cache_attrs, node) {
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if (info->cache_attrs.level == cache_attrs->level) {
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dev_warn(&node->dev,
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"attempt to add duplicate cache level:%d\n",
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cache_attrs->level);
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return;
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}
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}
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if (!node->cache_dev)
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node_init_cache_dev(node);
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if (!node->cache_dev)
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return;
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info = kzalloc(sizeof(*info), GFP_KERNEL);
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if (!info)
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return;
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dev = &info->dev;
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dev->parent = node->cache_dev;
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dev->release = node_cacheinfo_release;
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dev->groups = cache_groups;
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if (dev_set_name(dev, "index%d", cache_attrs->level))
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goto free_cache;
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info->cache_attrs = *cache_attrs;
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if (device_register(dev)) {
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dev_warn(&node->dev, "failed to add cache level:%d\n",
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cache_attrs->level);
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goto free_name;
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}
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pm_runtime_no_callbacks(dev);
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list_add_tail(&info->node, &node->cache_attrs);
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return;
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free_name:
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kfree_const(dev->kobj.name);
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free_cache:
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kfree(info);
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}
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static void node_remove_caches(struct node *node)
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{
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struct node_cache_info *info, *next;
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if (!node->cache_dev)
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return;
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list_for_each_entry_safe(info, next, &node->cache_attrs, node) {
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list_del(&info->node);
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device_unregister(&info->dev);
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}
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device_unregister(node->cache_dev);
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}
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static void node_init_caches(unsigned int nid)
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{
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INIT_LIST_HEAD(&node_devices[nid]->cache_attrs);
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}
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#else
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static void node_init_caches(unsigned int nid) { }
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static void node_remove_caches(struct node *node) { }
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#endif
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#define K(x) ((x) << (PAGE_SHIFT - 10))
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static ssize_t node_read_meminfo(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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int n;
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int nid = dev->id;
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struct pglist_data *pgdat = NODE_DATA(nid);
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struct sysinfo i;
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unsigned long sreclaimable, sunreclaimable;
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si_meminfo_node(&i, nid);
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sreclaimable = node_page_state(pgdat, NR_SLAB_RECLAIMABLE);
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sunreclaimable = node_page_state(pgdat, NR_SLAB_UNRECLAIMABLE);
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n = sprintf(buf,
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"Node %d MemTotal: %8lu kB\n"
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"Node %d MemFree: %8lu kB\n"
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"Node %d MemUsed: %8lu kB\n"
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"Node %d Active: %8lu kB\n"
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"Node %d Inactive: %8lu kB\n"
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"Node %d Active(anon): %8lu kB\n"
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"Node %d Inactive(anon): %8lu kB\n"
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"Node %d Active(file): %8lu kB\n"
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"Node %d Inactive(file): %8lu kB\n"
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"Node %d Unevictable: %8lu kB\n"
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"Node %d Mlocked: %8lu kB\n",
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nid, K(i.totalram),
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nid, K(i.freeram),
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nid, K(i.totalram - i.freeram),
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nid, K(node_page_state(pgdat, NR_ACTIVE_ANON) +
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node_page_state(pgdat, NR_ACTIVE_FILE)),
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nid, K(node_page_state(pgdat, NR_INACTIVE_ANON) +
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node_page_state(pgdat, NR_INACTIVE_FILE)),
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nid, K(node_page_state(pgdat, NR_ACTIVE_ANON)),
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nid, K(node_page_state(pgdat, NR_INACTIVE_ANON)),
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nid, K(node_page_state(pgdat, NR_ACTIVE_FILE)),
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nid, K(node_page_state(pgdat, NR_INACTIVE_FILE)),
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nid, K(node_page_state(pgdat, NR_UNEVICTABLE)),
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nid, K(sum_zone_node_page_state(nid, NR_MLOCK)));
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#ifdef CONFIG_HIGHMEM
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n += sprintf(buf + n,
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"Node %d HighTotal: %8lu kB\n"
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"Node %d HighFree: %8lu kB\n"
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"Node %d LowTotal: %8lu kB\n"
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"Node %d LowFree: %8lu kB\n",
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nid, K(i.totalhigh),
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nid, K(i.freehigh),
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nid, K(i.totalram - i.totalhigh),
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nid, K(i.freeram - i.freehigh));
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#endif
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n += sprintf(buf + n,
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"Node %d Dirty: %8lu kB\n"
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"Node %d Writeback: %8lu kB\n"
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"Node %d FilePages: %8lu kB\n"
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"Node %d Mapped: %8lu kB\n"
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"Node %d AnonPages: %8lu kB\n"
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"Node %d Shmem: %8lu kB\n"
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"Node %d KernelStack: %8lu kB\n"
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"Node %d PageTables: %8lu kB\n"
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"Node %d NFS_Unstable: %8lu kB\n"
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"Node %d Bounce: %8lu kB\n"
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"Node %d WritebackTmp: %8lu kB\n"
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"Node %d KReclaimable: %8lu kB\n"
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"Node %d Slab: %8lu kB\n"
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"Node %d SReclaimable: %8lu kB\n"
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"Node %d SUnreclaim: %8lu kB\n"
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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"Node %d AnonHugePages: %8lu kB\n"
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"Node %d ShmemHugePages: %8lu kB\n"
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"Node %d ShmemPmdMapped: %8lu kB\n"
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"Node %d FileHugePages: %8lu kB\n"
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"Node %d FilePmdMapped: %8lu kB\n"
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#endif
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,
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nid, K(node_page_state(pgdat, NR_FILE_DIRTY)),
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nid, K(node_page_state(pgdat, NR_WRITEBACK)),
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nid, K(node_page_state(pgdat, NR_FILE_PAGES)),
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nid, K(node_page_state(pgdat, NR_FILE_MAPPED)),
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nid, K(node_page_state(pgdat, NR_ANON_MAPPED)),
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nid, K(i.sharedram),
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nid, sum_zone_node_page_state(nid, NR_KERNEL_STACK_KB),
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nid, K(sum_zone_node_page_state(nid, NR_PAGETABLE)),
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nid, K(node_page_state(pgdat, NR_UNSTABLE_NFS)),
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nid, K(sum_zone_node_page_state(nid, NR_BOUNCE)),
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nid, K(node_page_state(pgdat, NR_WRITEBACK_TEMP)),
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nid, K(sreclaimable +
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node_page_state(pgdat, NR_KERNEL_MISC_RECLAIMABLE)),
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nid, K(sreclaimable + sunreclaimable),
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nid, K(sreclaimable),
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nid, K(sunreclaimable)
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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,
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nid, K(node_page_state(pgdat, NR_ANON_THPS) *
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HPAGE_PMD_NR),
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nid, K(node_page_state(pgdat, NR_SHMEM_THPS) *
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HPAGE_PMD_NR),
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nid, K(node_page_state(pgdat, NR_SHMEM_PMDMAPPED) *
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HPAGE_PMD_NR),
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nid, K(node_page_state(pgdat, NR_FILE_THPS) *
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HPAGE_PMD_NR),
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nid, K(node_page_state(pgdat, NR_FILE_PMDMAPPED) *
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HPAGE_PMD_NR)
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#endif
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);
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n += hugetlb_report_node_meminfo(nid, buf + n);
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return n;
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}
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#undef K
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static DEVICE_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL);
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static ssize_t node_read_numastat(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return sprintf(buf,
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"numa_hit %lu\n"
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"numa_miss %lu\n"
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"numa_foreign %lu\n"
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"interleave_hit %lu\n"
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"local_node %lu\n"
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"other_node %lu\n",
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sum_zone_numa_state(dev->id, NUMA_HIT),
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sum_zone_numa_state(dev->id, NUMA_MISS),
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sum_zone_numa_state(dev->id, NUMA_FOREIGN),
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sum_zone_numa_state(dev->id, NUMA_INTERLEAVE_HIT),
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|
sum_zone_numa_state(dev->id, NUMA_LOCAL),
|
|
sum_zone_numa_state(dev->id, NUMA_OTHER));
|
|
}
|
|
static DEVICE_ATTR(numastat, S_IRUGO, 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 n = 0;
|
|
|
|
for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
|
|
n += sprintf(buf+n, "%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++)
|
|
n += sprintf(buf+n, "%s %lu\n", numa_stat_name(i),
|
|
sum_zone_numa_state(nid, i));
|
|
#endif
|
|
|
|
for (i = 0; i < NR_VM_NODE_STAT_ITEMS; i++)
|
|
n += sprintf(buf+n, "%s %lu\n", node_stat_name(i),
|
|
node_page_state(pgdat, i));
|
|
|
|
return n;
|
|
}
|
|
static DEVICE_ATTR(vmstat, S_IRUGO, 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 += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i));
|
|
|
|
len += sprintf(buf + len, "\n");
|
|
return len;
|
|
}
|
|
static DEVICE_ATTR(distance, S_IRUGO, 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);
|
|
}
|
|
|
|
/* register memory section under specified node if it spans that node */
|
|
static int register_mem_sect_under_node(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 ret, 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 for the boot
|
|
* case, during hotplug we know that all pages in the memory
|
|
* block belong to the same node.
|
|
*/
|
|
if (system_state == SYSTEM_BOOTING) {
|
|
page_nid = get_nid_for_pfn(pfn);
|
|
if (page_nid < 0)
|
|
continue;
|
|
if (page_nid != nid)
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
return ret;
|
|
|
|
return sysfs_create_link_nowarn(&mem_blk->dev.kobj,
|
|
&node_devices[nid]->dev.kobj,
|
|
kobject_name(&node_devices[nid]->dev.kobj));
|
|
}
|
|
/* mem section does not span the specified node */
|
|
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));
|
|
}
|
|
|
|
int link_mem_sections(int nid, unsigned long start_pfn, unsigned long end_pfn)
|
|
{
|
|
return walk_memory_blocks(PFN_PHYS(start_pfn),
|
|
PFN_PHYS(end_pfn - start_pfn), (void *)&nid,
|
|
register_mem_sect_under_node);
|
|
}
|
|
|
|
#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
|
|
*/
|
|
|
|
static ssize_t print_nodes_state(enum node_states state, char *buf)
|
|
{
|
|
int n;
|
|
|
|
n = scnprintf(buf, PAGE_SIZE - 1, "%*pbl",
|
|
nodemask_pr_args(&node_states[state]));
|
|
buf[n++] = '\n';
|
|
buf[n] = '\0';
|
|
return n;
|
|
}
|
|
|
|
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 print_nodes_state(na->state, buf);
|
|
}
|
|
|
|
#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),
|
|
};
|
|
|
|
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,
|
|
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);
|