| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef _LINUX_CACHEINFO_H |
| #define _LINUX_CACHEINFO_H |
| |
| #include <linux/bitops.h> |
| #include <linux/cpu.h> |
| #include <linux/cpumask.h> |
| #include <linux/smp.h> |
| |
| struct device_node; |
| struct attribute; |
| |
| enum cache_type { |
| CACHE_TYPE_NOCACHE = 0, |
| CACHE_TYPE_INST = BIT(0), |
| CACHE_TYPE_DATA = BIT(1), |
| CACHE_TYPE_SEPARATE = CACHE_TYPE_INST | CACHE_TYPE_DATA, |
| CACHE_TYPE_UNIFIED = BIT(2), |
| }; |
| |
| extern unsigned int coherency_max_size; |
| |
| /** |
| * struct cacheinfo - represent a cache leaf node |
| * @id: This cache's id. It is unique among caches with the same (type, level). |
| * @type: type of the cache - data, inst or unified |
| * @level: represents the hierarchy in the multi-level cache |
| * @coherency_line_size: size of each cache line usually representing |
| * the minimum amount of data that gets transferred from memory |
| * @number_of_sets: total number of sets, a set is a collection of cache |
| * lines sharing the same index |
| * @ways_of_associativity: number of ways in which a particular memory |
| * block can be placed in the cache |
| * @physical_line_partition: number of physical cache lines sharing the |
| * same cachetag |
| * @size: Total size of the cache |
| * @shared_cpu_map: logical cpumask representing all the cpus sharing |
| * this cache node |
| * @attributes: bitfield representing various cache attributes |
| * @fw_token: Unique value used to determine if different cacheinfo |
| * structures represent a single hardware cache instance. |
| * @disable_sysfs: indicates whether this node is visible to the user via |
| * sysfs or not |
| * @priv: pointer to any private data structure specific to particular |
| * cache design |
| * |
| * While @of_node, @disable_sysfs and @priv are used for internal book |
| * keeping, the remaining members form the core properties of the cache |
| */ |
| struct cacheinfo { |
| unsigned int id; |
| enum cache_type type; |
| unsigned int level; |
| unsigned int coherency_line_size; |
| unsigned int number_of_sets; |
| unsigned int ways_of_associativity; |
| unsigned int physical_line_partition; |
| unsigned int size; |
| cpumask_t shared_cpu_map; |
| unsigned int attributes; |
| #define CACHE_WRITE_THROUGH BIT(0) |
| #define CACHE_WRITE_BACK BIT(1) |
| #define CACHE_WRITE_POLICY_MASK \ |
| (CACHE_WRITE_THROUGH | CACHE_WRITE_BACK) |
| #define CACHE_READ_ALLOCATE BIT(2) |
| #define CACHE_WRITE_ALLOCATE BIT(3) |
| #define CACHE_ALLOCATE_POLICY_MASK \ |
| (CACHE_READ_ALLOCATE | CACHE_WRITE_ALLOCATE) |
| #define CACHE_ID BIT(4) |
| void *fw_token; |
| bool disable_sysfs; |
| void *priv; |
| }; |
| |
| struct cpu_cacheinfo { |
| struct cacheinfo *info_list; |
| unsigned int num_levels; |
| unsigned int num_leaves; |
| bool cpu_map_populated; |
| }; |
| |
| /* |
| * Helpers to make sure "func" is executed on the cpu whose cache |
| * attributes are being detected |
| */ |
| #define DEFINE_SMP_CALL_CACHE_FUNCTION(func) \ |
| static inline void _##func(void *ret) \ |
| { \ |
| int cpu = smp_processor_id(); \ |
| *(int *)ret = __##func(cpu); \ |
| } \ |
| \ |
| int func(unsigned int cpu) \ |
| { \ |
| int ret; \ |
| smp_call_function_single(cpu, _##func, &ret, true); \ |
| return ret; \ |
| } |
| |
| struct cpu_cacheinfo *get_cpu_cacheinfo(unsigned int cpu); |
| int init_cache_level(unsigned int cpu); |
| int populate_cache_leaves(unsigned int cpu); |
| int cache_setup_acpi(unsigned int cpu); |
| #ifndef CONFIG_ACPI_PPTT |
| /* |
| * acpi_find_last_cache_level is only called on ACPI enabled |
| * platforms using the PPTT for topology. This means that if |
| * the platform supports other firmware configuration methods |
| * we need to stub out the call when ACPI is disabled. |
| * ACPI enabled platforms not using PPTT won't be making calls |
| * to this function so we need not worry about them. |
| */ |
| static inline int acpi_find_last_cache_level(unsigned int cpu) |
| { |
| return 0; |
| } |
| #else |
| int acpi_find_last_cache_level(unsigned int cpu); |
| #endif |
| |
| const struct attribute_group *cache_get_priv_group(struct cacheinfo *this_leaf); |
| |
| /* |
| * Get the id of the cache associated with @cpu at level @level. |
| * cpuhp lock must be held. |
| */ |
| static inline int get_cpu_cacheinfo_id(int cpu, int level) |
| { |
| struct cpu_cacheinfo *ci = get_cpu_cacheinfo(cpu); |
| int i; |
| |
| for (i = 0; i < ci->num_leaves; i++) { |
| if (ci->info_list[i].level == level) { |
| if (ci->info_list[i].attributes & CACHE_ID) |
| return ci->info_list[i].id; |
| return -1; |
| } |
| } |
| |
| return -1; |
| } |
| |
| #endif /* _LINUX_CACHEINFO_H */ |