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