![Keith Busch](/assets/img/avatar_default.png)
System memory may have caches to help improve access speed to frequently requested address ranges. While the system provided cache is transparent to the software accessing these memory ranges, applications can optimize their own access based on cache attributes. Provide a new API for the kernel to register these memory-side caches under the memory node that provides it. The new sysfs representation is modeled from the existing cpu cacheinfo attributes, as seen from /sys/devices/system/cpu/<cpu>/cache/. Unlike CPU cacheinfo though, the node cache level is reported from the view of the memory. A higher level number is nearer to the CPU, while lower levels are closer to the last level memory. The exported attributes are the cache size, the line size, associativity indexing, and write back policy, and add the attributes for the system memory caches to sysfs stable documentation. Signed-off-by: Keith Busch <keith.busch@intel.com> Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Reviewed-by: Brice Goglin <Brice.Goglin@inria.fr> Tested-by: Brice Goglin <Brice.Goglin@inria.fr> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1034 lines
27 KiB
C
1034 lines
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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*/
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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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#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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#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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|
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#undef K
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static DEVICE_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL);
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|
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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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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"
|
|
"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, 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", vmstat_text[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",
|
|
vmstat_text[i + NR_VM_ZONE_STAT_ITEMS],
|
|
sum_zone_numa_state(nid, i));
|
|
#endif
|
|
|
|
for (i = 0; i < NR_VM_NODE_STAT_ITEMS; i++)
|
|
n += sprintf(buf+n, "%s %lu\n",
|
|
vmstat_text[i + NR_VM_ZONE_STAT_ITEMS +
|
|
NR_VM_NUMA_STAT_ITEMS],
|
|
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_node: Memory node number
|
|
* @cpu_node: 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 */
|
|
int register_mem_sect_under_node(struct memory_block *mem_blk, void *arg)
|
|
{
|
|
int ret, nid = *(int *)arg;
|
|
unsigned long pfn, sect_start_pfn, sect_end_pfn;
|
|
|
|
mem_blk->nid = nid;
|
|
|
|
sect_start_pfn = section_nr_to_pfn(mem_blk->start_section_nr);
|
|
sect_end_pfn = section_nr_to_pfn(mem_blk->end_section_nr);
|
|
sect_end_pfn += PAGES_PER_SECTION - 1;
|
|
for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) {
|
|
int page_nid;
|
|
|
|
/*
|
|
* memory block could have several absent sections from start.
|
|
* skip pfn range from absent section
|
|
*/
|
|
if (!pfn_present(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;
|
|
}
|
|
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 memory section under all nodes that it spans */
|
|
int unregister_mem_sect_under_nodes(struct memory_block *mem_blk,
|
|
unsigned long phys_index)
|
|
{
|
|
NODEMASK_ALLOC(nodemask_t, unlinked_nodes, GFP_KERNEL);
|
|
unsigned long pfn, sect_start_pfn, sect_end_pfn;
|
|
|
|
if (!mem_blk) {
|
|
NODEMASK_FREE(unlinked_nodes);
|
|
return -EFAULT;
|
|
}
|
|
if (!unlinked_nodes)
|
|
return -ENOMEM;
|
|
nodes_clear(*unlinked_nodes);
|
|
|
|
sect_start_pfn = section_nr_to_pfn(phys_index);
|
|
sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1;
|
|
for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) {
|
|
int nid;
|
|
|
|
nid = get_nid_for_pfn(pfn);
|
|
if (nid < 0)
|
|
continue;
|
|
if (!node_online(nid))
|
|
continue;
|
|
if (node_test_and_set(nid, *unlinked_nodes))
|
|
continue;
|
|
sysfs_remove_link(&node_devices[nid]->dev.kobj,
|
|
kobject_name(&mem_blk->dev.kobj));
|
|
sysfs_remove_link(&mem_blk->dev.kobj,
|
|
kobject_name(&node_devices[nid]->dev.kobj));
|
|
}
|
|
NODEMASK_FREE(unlinked_nodes);
|
|
return 0;
|
|
}
|
|
|
|
int link_mem_sections(int nid, unsigned long start_pfn, unsigned long end_pfn)
|
|
{
|
|
return walk_memory_range(start_pfn, end_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);
|