diff options
Diffstat (limited to 'drivers/base/cacheinfo.c')
| -rw-r--r-- | drivers/base/cacheinfo.c | 548 |
1 files changed, 548 insertions, 0 deletions
diff --git a/drivers/base/cacheinfo.c b/drivers/base/cacheinfo.c new file mode 100644 index 000000000..df0c66cb7 --- /dev/null +++ b/drivers/base/cacheinfo.c @@ -0,0 +1,548 @@ +/* + * 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/>. + */ +#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; +} +#else +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; + + ret = cache_setup_of_node(cpu); + 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); + 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 free_cache_attributes(unsigned int cpu) +{ + 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 hierarcy, 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 hierarcy from DT for CPU %d\n", + cpu); + goto free_ci; + } + 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(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(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_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_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 void cache_remove_dev(unsigned int cpu) +{ + if (!cpumask_test_cpu(cpu, &cache_dev_map)) + return; + cpumask_clear_cpu(cpu, &cache_dev_map); + + cpu_cache_sysfs_exit(cpu); +} + +static int cacheinfo_cpu_callback(struct notifier_block *nfb, + unsigned long action, void *hcpu) +{ + unsigned int cpu = (unsigned long)hcpu; + int rc = 0; + + switch (action & ~CPU_TASKS_FROZEN) { + case CPU_ONLINE: + rc = detect_cache_attributes(cpu); + if (!rc) + rc = cache_add_dev(cpu); + break; + case CPU_DEAD: + cache_remove_dev(cpu); + if (per_cpu_cacheinfo(cpu)) + free_cache_attributes(cpu); + break; + } + return notifier_from_errno(rc); +} + +static int __init cacheinfo_sysfs_init(void) +{ + int cpu, rc = 0; + + cpu_notifier_register_begin(); + + for_each_online_cpu(cpu) { + rc = detect_cache_attributes(cpu); + if (rc) + goto out; + rc = cache_add_dev(cpu); + if (rc) { + free_cache_attributes(cpu); + pr_err("error populating cacheinfo..cpu%d\n", cpu); + goto out; + } + } + __hotcpu_notifier(cacheinfo_cpu_callback, 0); + +out: + cpu_notifier_register_done(); + return rc; +} + +device_initcall(cacheinfo_sysfs_init); 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