| /* |
| * cacheinfo support - processor cache information via sysfs |
| * |
| * Based on arch/x86/kernel/cpu/intel_cacheinfo.c |
| * Author: Sudeep Holla <sudeep.holla@arm.com> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| * |
| * This program is distributed "as is" WITHOUT ANY WARRANTY of any |
| * kind, whether express or implied; without even the implied warranty |
| * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| */ |
| #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| |
| #include <linux/acpi.h> |
| #include <linux/bitops.h> |
| #include <linux/cacheinfo.h> |
| #include <linux/compiler.h> |
| #include <linux/cpu.h> |
| #include <linux/device.h> |
| #include <linux/init.h> |
| #include <linux/of.h> |
| #include <linux/sched.h> |
| #include <linux/slab.h> |
| #include <linux/smp.h> |
| #include <linux/sysfs.h> |
| |
| /* pointer to per cpu cacheinfo */ |
| static DEFINE_PER_CPU(struct cpu_cacheinfo, ci_cpu_cacheinfo); |
| #define ci_cacheinfo(cpu) (&per_cpu(ci_cpu_cacheinfo, cpu)) |
| #define cache_leaves(cpu) (ci_cacheinfo(cpu)->num_leaves) |
| #define per_cpu_cacheinfo(cpu) (ci_cacheinfo(cpu)->info_list) |
| |
| struct cpu_cacheinfo *get_cpu_cacheinfo(unsigned int cpu) |
| { |
| return ci_cacheinfo(cpu); |
| } |
| |
| #ifdef CONFIG_OF |
| static int cache_setup_of_node(unsigned int cpu) |
| { |
| struct device_node *np; |
| struct cacheinfo *this_leaf; |
| struct device *cpu_dev = get_cpu_device(cpu); |
| struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu); |
| unsigned int index = 0; |
| |
| /* skip if of_node is already populated */ |
| if (this_cpu_ci->info_list->of_node) |
| return 0; |
| |
| if (!cpu_dev) { |
| pr_err("No cpu device for CPU %d\n", cpu); |
| return -ENODEV; |
| } |
| np = cpu_dev->of_node; |
| if (!np) { |
| pr_err("Failed to find cpu%d device node\n", cpu); |
| return -ENOENT; |
| } |
| |
| while (index < cache_leaves(cpu)) { |
| this_leaf = this_cpu_ci->info_list + index; |
| if (this_leaf->level != 1) |
| np = of_find_next_cache_node(np); |
| else |
| np = of_node_get(np);/* cpu node itself */ |
| if (!np) |
| break; |
| this_leaf->of_node = np; |
| index++; |
| } |
| |
| if (index != cache_leaves(cpu)) /* not all OF nodes populated */ |
| return -ENOENT; |
| |
| return 0; |
| } |
| |
| static inline bool cache_leaves_are_shared(struct cacheinfo *this_leaf, |
| struct cacheinfo *sib_leaf) |
| { |
| return sib_leaf->of_node == this_leaf->of_node; |
| } |
| |
| /* OF properties to query for a given cache type */ |
| struct cache_type_info { |
| const char *size_prop; |
| const char *line_size_props[2]; |
| const char *nr_sets_prop; |
| }; |
| |
| static const struct cache_type_info cache_type_info[] = { |
| { |
| .size_prop = "cache-size", |
| .line_size_props = { "cache-line-size", |
| "cache-block-size", }, |
| .nr_sets_prop = "cache-sets", |
| }, { |
| .size_prop = "i-cache-size", |
| .line_size_props = { "i-cache-line-size", |
| "i-cache-block-size", }, |
| .nr_sets_prop = "i-cache-sets", |
| }, { |
| .size_prop = "d-cache-size", |
| .line_size_props = { "d-cache-line-size", |
| "d-cache-block-size", }, |
| .nr_sets_prop = "d-cache-sets", |
| }, |
| }; |
| |
| static inline int get_cacheinfo_idx(enum cache_type type) |
| { |
| if (type == CACHE_TYPE_UNIFIED) |
| return 0; |
| return type; |
| } |
| |
| static void cache_size(struct cacheinfo *this_leaf) |
| { |
| const char *propname; |
| const __be32 *cache_size; |
| int ct_idx; |
| |
| ct_idx = get_cacheinfo_idx(this_leaf->type); |
| propname = cache_type_info[ct_idx].size_prop; |
| |
| cache_size = of_get_property(this_leaf->of_node, propname, NULL); |
| if (cache_size) |
| this_leaf->size = of_read_number(cache_size, 1); |
| } |
| |
| /* not cache_line_size() because that's a macro in include/linux/cache.h */ |
| static void cache_get_line_size(struct cacheinfo *this_leaf) |
| { |
| const __be32 *line_size; |
| int i, lim, ct_idx; |
| |
| ct_idx = get_cacheinfo_idx(this_leaf->type); |
| lim = ARRAY_SIZE(cache_type_info[ct_idx].line_size_props); |
| |
| for (i = 0; i < lim; i++) { |
| const char *propname; |
| |
| propname = cache_type_info[ct_idx].line_size_props[i]; |
| line_size = of_get_property(this_leaf->of_node, propname, NULL); |
| if (line_size) |
| break; |
| } |
| |
| if (line_size) |
| this_leaf->coherency_line_size = of_read_number(line_size, 1); |
| } |
| |
| static void cache_nr_sets(struct cacheinfo *this_leaf) |
| { |
| const char *propname; |
| const __be32 *nr_sets; |
| int ct_idx; |
| |
| ct_idx = get_cacheinfo_idx(this_leaf->type); |
| propname = cache_type_info[ct_idx].nr_sets_prop; |
| |
| nr_sets = of_get_property(this_leaf->of_node, propname, NULL); |
| if (nr_sets) |
| this_leaf->number_of_sets = of_read_number(nr_sets, 1); |
| } |
| |
| static void cache_associativity(struct cacheinfo *this_leaf) |
| { |
| unsigned int line_size = this_leaf->coherency_line_size; |
| unsigned int nr_sets = this_leaf->number_of_sets; |
| unsigned int size = this_leaf->size; |
| |
| /* |
| * If the cache is fully associative, there is no need to |
| * check the other properties. |
| */ |
| if (!(nr_sets == 1) && (nr_sets > 0 && size > 0 && line_size > 0)) |
| this_leaf->ways_of_associativity = (size / nr_sets) / line_size; |
| } |
| |
| static bool cache_node_is_unified(struct cacheinfo *this_leaf) |
| { |
| return of_property_read_bool(this_leaf->of_node, "cache-unified"); |
| } |
| |
| static void cache_of_override_properties(unsigned int cpu) |
| { |
| int index; |
| struct cacheinfo *this_leaf; |
| struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu); |
| |
| for (index = 0; index < cache_leaves(cpu); index++) { |
| this_leaf = this_cpu_ci->info_list + index; |
| /* |
| * init_cache_level must setup the cache level correctly |
| * overriding the architecturally specified levels, so |
| * if type is NONE at this stage, it should be unified |
| */ |
| if (this_leaf->type == CACHE_TYPE_NOCACHE && |
| cache_node_is_unified(this_leaf)) |
| this_leaf->type = CACHE_TYPE_UNIFIED; |
| cache_size(this_leaf); |
| cache_get_line_size(this_leaf); |
| cache_nr_sets(this_leaf); |
| cache_associativity(this_leaf); |
| } |
| } |
| #else |
| static void cache_of_override_properties(unsigned int cpu) { } |
| static inline int cache_setup_of_node(unsigned int cpu) { return 0; } |
| static inline bool cache_leaves_are_shared(struct cacheinfo *this_leaf, |
| struct cacheinfo *sib_leaf) |
| { |
| /* |
| * For non-DT systems, assume unique level 1 cache, system-wide |
| * shared caches for all other levels. This will be used only if |
| * arch specific code has not populated shared_cpu_map |
| */ |
| return !(this_leaf->level == 1); |
| } |
| #endif |
| |
| static int cache_shared_cpu_map_setup(unsigned int cpu) |
| { |
| struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu); |
| struct cacheinfo *this_leaf, *sib_leaf; |
| unsigned int index; |
| int ret = 0; |
| |
| if (this_cpu_ci->cpu_map_populated) |
| return 0; |
| |
| if (of_have_populated_dt()) |
| ret = cache_setup_of_node(cpu); |
| else if (!acpi_disabled) |
| /* No cache property/hierarchy support yet in ACPI */ |
| ret = -ENOTSUPP; |
| if (ret) |
| return ret; |
| |
| for (index = 0; index < cache_leaves(cpu); index++) { |
| unsigned int i; |
| |
| this_leaf = this_cpu_ci->info_list + index; |
| /* skip if shared_cpu_map is already populated */ |
| if (!cpumask_empty(&this_leaf->shared_cpu_map)) |
| continue; |
| |
| cpumask_set_cpu(cpu, &this_leaf->shared_cpu_map); |
| for_each_online_cpu(i) { |
| struct cpu_cacheinfo *sib_cpu_ci = get_cpu_cacheinfo(i); |
| |
| if (i == cpu || !sib_cpu_ci->info_list) |
| continue;/* skip if itself or no cacheinfo */ |
| sib_leaf = sib_cpu_ci->info_list + index; |
| if (cache_leaves_are_shared(this_leaf, sib_leaf)) { |
| cpumask_set_cpu(cpu, &sib_leaf->shared_cpu_map); |
| cpumask_set_cpu(i, &this_leaf->shared_cpu_map); |
| } |
| } |
| } |
| |
| return 0; |
| } |
| |
| static void cache_shared_cpu_map_remove(unsigned int cpu) |
| { |
| struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu); |
| struct cacheinfo *this_leaf, *sib_leaf; |
| unsigned int sibling, index; |
| |
| for (index = 0; index < cache_leaves(cpu); index++) { |
| this_leaf = this_cpu_ci->info_list + index; |
| for_each_cpu(sibling, &this_leaf->shared_cpu_map) { |
| struct cpu_cacheinfo *sib_cpu_ci; |
| |
| if (sibling == cpu) /* skip itself */ |
| continue; |
| |
| sib_cpu_ci = get_cpu_cacheinfo(sibling); |
| if (!sib_cpu_ci->info_list) |
| continue; |
| |
| sib_leaf = sib_cpu_ci->info_list + index; |
| cpumask_clear_cpu(cpu, &sib_leaf->shared_cpu_map); |
| cpumask_clear_cpu(sibling, &this_leaf->shared_cpu_map); |
| } |
| of_node_put(this_leaf->of_node); |
| } |
| } |
| |
| static void cache_override_properties(unsigned int cpu) |
| { |
| if (of_have_populated_dt()) |
| return cache_of_override_properties(cpu); |
| } |
| |
| static void free_cache_attributes(unsigned int cpu) |
| { |
| if (!per_cpu_cacheinfo(cpu)) |
| return; |
| |
| cache_shared_cpu_map_remove(cpu); |
| |
| kfree(per_cpu_cacheinfo(cpu)); |
| per_cpu_cacheinfo(cpu) = NULL; |
| } |
| |
| int __weak init_cache_level(unsigned int cpu) |
| { |
| return -ENOENT; |
| } |
| |
| int __weak populate_cache_leaves(unsigned int cpu) |
| { |
| return -ENOENT; |
| } |
| |
| static int detect_cache_attributes(unsigned int cpu) |
| { |
| int ret; |
| |
| if (init_cache_level(cpu) || !cache_leaves(cpu)) |
| return -ENOENT; |
| |
| per_cpu_cacheinfo(cpu) = kcalloc(cache_leaves(cpu), |
| sizeof(struct cacheinfo), GFP_KERNEL); |
| if (per_cpu_cacheinfo(cpu) == NULL) |
| return -ENOMEM; |
| |
| ret = populate_cache_leaves(cpu); |
| if (ret) |
| goto free_ci; |
| /* |
| * For systems using DT for cache hierarchy, of_node and shared_cpu_map |
| * will be set up here only if they are not populated already |
| */ |
| ret = cache_shared_cpu_map_setup(cpu); |
| if (ret) { |
| pr_warn("Unable to detect cache hierarchy for CPU %d\n", cpu); |
| goto free_ci; |
| } |
| |
| cache_override_properties(cpu); |
| return 0; |
| |
| free_ci: |
| free_cache_attributes(cpu); |
| return ret; |
| } |
| |
| /* pointer to cpuX/cache device */ |
| static DEFINE_PER_CPU(struct device *, ci_cache_dev); |
| #define per_cpu_cache_dev(cpu) (per_cpu(ci_cache_dev, cpu)) |
| |
| static cpumask_t cache_dev_map; |
| |
| /* pointer to array of devices for cpuX/cache/indexY */ |
| static DEFINE_PER_CPU(struct device **, ci_index_dev); |
| #define per_cpu_index_dev(cpu) (per_cpu(ci_index_dev, cpu)) |
| #define per_cache_index_dev(cpu, idx) ((per_cpu_index_dev(cpu))[idx]) |
| |
| #define show_one(file_name, object) \ |
| static ssize_t file_name##_show(struct device *dev, \ |
| struct device_attribute *attr, char *buf) \ |
| { \ |
| struct cacheinfo *this_leaf = dev_get_drvdata(dev); \ |
| return sprintf(buf, "%u\n", this_leaf->object); \ |
| } |
| |
| show_one(id, id); |
| show_one(level, level); |
| show_one(coherency_line_size, coherency_line_size); |
| show_one(number_of_sets, number_of_sets); |
| show_one(physical_line_partition, physical_line_partition); |
| show_one(ways_of_associativity, ways_of_associativity); |
| |
| static ssize_t size_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct cacheinfo *this_leaf = dev_get_drvdata(dev); |
| |
| return sprintf(buf, "%uK\n", this_leaf->size >> 10); |
| } |
| |
| static ssize_t shared_cpumap_show_func(struct device *dev, bool list, char *buf) |
| { |
| struct cacheinfo *this_leaf = dev_get_drvdata(dev); |
| const struct cpumask *mask = &this_leaf->shared_cpu_map; |
| |
| return cpumap_print_to_pagebuf(list, buf, mask); |
| } |
| |
| static ssize_t shared_cpu_map_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| return shared_cpumap_show_func(dev, false, buf); |
| } |
| |
| static ssize_t shared_cpu_list_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| return shared_cpumap_show_func(dev, true, buf); |
| } |
| |
| static ssize_t type_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct cacheinfo *this_leaf = dev_get_drvdata(dev); |
| |
| switch (this_leaf->type) { |
| case CACHE_TYPE_DATA: |
| return sprintf(buf, "Data\n"); |
| case CACHE_TYPE_INST: |
| return sprintf(buf, "Instruction\n"); |
| case CACHE_TYPE_UNIFIED: |
| return sprintf(buf, "Unified\n"); |
| default: |
| return -EINVAL; |
| } |
| } |
| |
| static ssize_t allocation_policy_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct cacheinfo *this_leaf = dev_get_drvdata(dev); |
| unsigned int ci_attr = this_leaf->attributes; |
| int n = 0; |
| |
| if ((ci_attr & CACHE_READ_ALLOCATE) && (ci_attr & CACHE_WRITE_ALLOCATE)) |
| n = sprintf(buf, "ReadWriteAllocate\n"); |
| else if (ci_attr & CACHE_READ_ALLOCATE) |
| n = sprintf(buf, "ReadAllocate\n"); |
| else if (ci_attr & CACHE_WRITE_ALLOCATE) |
| n = sprintf(buf, "WriteAllocate\n"); |
| return n; |
| } |
| |
| static ssize_t write_policy_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct cacheinfo *this_leaf = dev_get_drvdata(dev); |
| unsigned int ci_attr = this_leaf->attributes; |
| int n = 0; |
| |
| if (ci_attr & CACHE_WRITE_THROUGH) |
| n = sprintf(buf, "WriteThrough\n"); |
| else if (ci_attr & CACHE_WRITE_BACK) |
| n = sprintf(buf, "WriteBack\n"); |
| return n; |
| } |
| |
| static DEVICE_ATTR_RO(id); |
| static DEVICE_ATTR_RO(level); |
| static DEVICE_ATTR_RO(type); |
| static DEVICE_ATTR_RO(coherency_line_size); |
| static DEVICE_ATTR_RO(ways_of_associativity); |
| static DEVICE_ATTR_RO(number_of_sets); |
| static DEVICE_ATTR_RO(size); |
| static DEVICE_ATTR_RO(allocation_policy); |
| static DEVICE_ATTR_RO(write_policy); |
| static DEVICE_ATTR_RO(shared_cpu_map); |
| static DEVICE_ATTR_RO(shared_cpu_list); |
| static DEVICE_ATTR_RO(physical_line_partition); |
| |
| static struct attribute *cache_default_attrs[] = { |
| &dev_attr_id.attr, |
| &dev_attr_type.attr, |
| &dev_attr_level.attr, |
| &dev_attr_shared_cpu_map.attr, |
| &dev_attr_shared_cpu_list.attr, |
| &dev_attr_coherency_line_size.attr, |
| &dev_attr_ways_of_associativity.attr, |
| &dev_attr_number_of_sets.attr, |
| &dev_attr_size.attr, |
| &dev_attr_allocation_policy.attr, |
| &dev_attr_write_policy.attr, |
| &dev_attr_physical_line_partition.attr, |
| NULL |
| }; |
| |
| static umode_t |
| cache_default_attrs_is_visible(struct kobject *kobj, |
| struct attribute *attr, int unused) |
| { |
| struct device *dev = kobj_to_dev(kobj); |
| struct cacheinfo *this_leaf = dev_get_drvdata(dev); |
| const struct cpumask *mask = &this_leaf->shared_cpu_map; |
| umode_t mode = attr->mode; |
| |
| if ((attr == &dev_attr_id.attr) && (this_leaf->attributes & CACHE_ID)) |
| return mode; |
| if ((attr == &dev_attr_type.attr) && this_leaf->type) |
| return mode; |
| if ((attr == &dev_attr_level.attr) && this_leaf->level) |
| return mode; |
| if ((attr == &dev_attr_shared_cpu_map.attr) && !cpumask_empty(mask)) |
| return mode; |
| if ((attr == &dev_attr_shared_cpu_list.attr) && !cpumask_empty(mask)) |
| return mode; |
| if ((attr == &dev_attr_coherency_line_size.attr) && |
| this_leaf->coherency_line_size) |
| return mode; |
| if ((attr == &dev_attr_ways_of_associativity.attr) && |
| this_leaf->size) /* allow 0 = full associativity */ |
| return mode; |
| if ((attr == &dev_attr_number_of_sets.attr) && |
| this_leaf->number_of_sets) |
| return mode; |
| if ((attr == &dev_attr_size.attr) && this_leaf->size) |
| return mode; |
| if ((attr == &dev_attr_write_policy.attr) && |
| (this_leaf->attributes & CACHE_WRITE_POLICY_MASK)) |
| return mode; |
| if ((attr == &dev_attr_allocation_policy.attr) && |
| (this_leaf->attributes & CACHE_ALLOCATE_POLICY_MASK)) |
| return mode; |
| if ((attr == &dev_attr_physical_line_partition.attr) && |
| this_leaf->physical_line_partition) |
| return mode; |
| |
| return 0; |
| } |
| |
| static const struct attribute_group cache_default_group = { |
| .attrs = cache_default_attrs, |
| .is_visible = cache_default_attrs_is_visible, |
| }; |
| |
| static const struct attribute_group *cache_default_groups[] = { |
| &cache_default_group, |
| NULL, |
| }; |
| |
| static const struct attribute_group *cache_private_groups[] = { |
| &cache_default_group, |
| NULL, /* Place holder for private group */ |
| NULL, |
| }; |
| |
| const struct attribute_group * |
| __weak cache_get_priv_group(struct cacheinfo *this_leaf) |
| { |
| return NULL; |
| } |
| |
| static const struct attribute_group ** |
| cache_get_attribute_groups(struct cacheinfo *this_leaf) |
| { |
| const struct attribute_group *priv_group = |
| cache_get_priv_group(this_leaf); |
| |
| if (!priv_group) |
| return cache_default_groups; |
| |
| if (!cache_private_groups[1]) |
| cache_private_groups[1] = priv_group; |
| |
| return cache_private_groups; |
| } |
| |
| /* Add/Remove cache interface for CPU device */ |
| static void cpu_cache_sysfs_exit(unsigned int cpu) |
| { |
| int i; |
| struct device *ci_dev; |
| |
| if (per_cpu_index_dev(cpu)) { |
| for (i = 0; i < cache_leaves(cpu); i++) { |
| ci_dev = per_cache_index_dev(cpu, i); |
| if (!ci_dev) |
| continue; |
| device_unregister(ci_dev); |
| } |
| kfree(per_cpu_index_dev(cpu)); |
| per_cpu_index_dev(cpu) = NULL; |
| } |
| device_unregister(per_cpu_cache_dev(cpu)); |
| per_cpu_cache_dev(cpu) = NULL; |
| } |
| |
| static int cpu_cache_sysfs_init(unsigned int cpu) |
| { |
| struct device *dev = get_cpu_device(cpu); |
| |
| if (per_cpu_cacheinfo(cpu) == NULL) |
| return -ENOENT; |
| |
| per_cpu_cache_dev(cpu) = cpu_device_create(dev, NULL, NULL, "cache"); |
| if (IS_ERR(per_cpu_cache_dev(cpu))) |
| return PTR_ERR(per_cpu_cache_dev(cpu)); |
| |
| /* Allocate all required memory */ |
| per_cpu_index_dev(cpu) = kcalloc(cache_leaves(cpu), |
| sizeof(struct device *), GFP_KERNEL); |
| if (unlikely(per_cpu_index_dev(cpu) == NULL)) |
| goto err_out; |
| |
| return 0; |
| |
| err_out: |
| cpu_cache_sysfs_exit(cpu); |
| return -ENOMEM; |
| } |
| |
| static int cache_add_dev(unsigned int cpu) |
| { |
| unsigned int i; |
| int rc; |
| struct device *ci_dev, *parent; |
| struct cacheinfo *this_leaf; |
| struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu); |
| const struct attribute_group **cache_groups; |
| |
| rc = cpu_cache_sysfs_init(cpu); |
| if (unlikely(rc < 0)) |
| return rc; |
| |
| parent = per_cpu_cache_dev(cpu); |
| for (i = 0; i < cache_leaves(cpu); i++) { |
| this_leaf = this_cpu_ci->info_list + i; |
| if (this_leaf->disable_sysfs) |
| continue; |
| cache_groups = cache_get_attribute_groups(this_leaf); |
| ci_dev = cpu_device_create(parent, this_leaf, cache_groups, |
| "index%1u", i); |
| if (IS_ERR(ci_dev)) { |
| rc = PTR_ERR(ci_dev); |
| goto err; |
| } |
| per_cache_index_dev(cpu, i) = ci_dev; |
| } |
| cpumask_set_cpu(cpu, &cache_dev_map); |
| |
| return 0; |
| err: |
| cpu_cache_sysfs_exit(cpu); |
| return rc; |
| } |
| |
| static int cacheinfo_cpu_online(unsigned int cpu) |
| { |
| int rc = detect_cache_attributes(cpu); |
| |
| if (rc) |
| return rc; |
| rc = cache_add_dev(cpu); |
| if (rc) |
| free_cache_attributes(cpu); |
| return rc; |
| } |
| |
| static int cacheinfo_cpu_pre_down(unsigned int cpu) |
| { |
| if (cpumask_test_and_clear_cpu(cpu, &cache_dev_map)) |
| cpu_cache_sysfs_exit(cpu); |
| |
| free_cache_attributes(cpu); |
| return 0; |
| } |
| |
| static int __init cacheinfo_sysfs_init(void) |
| { |
| return cpuhp_setup_state(CPUHP_AP_BASE_CACHEINFO_ONLINE, |
| "base/cacheinfo:online", |
| cacheinfo_cpu_online, cacheinfo_cpu_pre_down); |
| } |
| device_initcall(cacheinfo_sysfs_init); |