projects / mirror_ubuntu-bionic-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 246246cb SH |
2 | #ifndef _LINUX_CACHEINFO_H |
| 3 | #define _LINUX_CACHEINFO_H | |
| 4 | ||
| 5 | #include <linux/bitops.h> | |
| 6 | #include <linux/cpumask.h> | |
| 7 | #include <linux/smp.h> | |
| 8 | ||
| 9 | struct device_node; | |
| 10 | struct attribute; | |
| 11 | ||
| 12 | enum cache_type { | |
| 13 | CACHE_TYPE_NOCACHE = 0, | |
| 14 | CACHE_TYPE_INST = BIT(0), | |
| 15 | CACHE_TYPE_DATA = BIT(1), | |
| 16 | CACHE_TYPE_SEPARATE = CACHE_TYPE_INST | CACHE_TYPE_DATA, | |
| 17 | CACHE_TYPE_UNIFIED = BIT(2), | |
| 18 | }; | |
| 19 | ||
| 20 | /** | |
| 21 | * struct cacheinfo - represent a cache leaf node | |
| e9a2ea5a | 22 | * @id: This cache's id. It is unique among caches with the same (type, level). |
| 246246cb | 23 | * @type: type of the cache - data, inst or unified |
| 2539b258 | 24 | * @level: represents the hierarchy in the multi-level cache |
| 246246cb SH |
25 | * @coherency_line_size: size of each cache line usually representing |
| 26 | * the minimum amount of data that gets transferred from memory | |
| 27 | * @number_of_sets: total number of sets, a set is a collection of cache | |
| 28 | * lines sharing the same index | |
| 29 | * @ways_of_associativity: number of ways in which a particular memory | |
| 30 | * block can be placed in the cache | |
| 31 | * @physical_line_partition: number of physical cache lines sharing the | |
| 32 | * same cachetag | |
| 33 | * @size: Total size of the cache | |
| 34 | * @shared_cpu_map: logical cpumask representing all the cpus sharing | |
| 35 | * this cache node | |
| 36 | * @attributes: bitfield representing various cache attributes | |
| 37 | * @of_node: if devicetree is used, this represents either the cpu node in | |
| 38 | * case there's no explicit cache node or the cache node itself in the | |
| 39 | * device tree | |
| 40 | * @disable_sysfs: indicates whether this node is visible to the user via | |
| 41 | * sysfs or not | |
| 42 | * @priv: pointer to any private data structure specific to particular | |
| 43 | * cache design | |
| 44 | * | |
| 45 | * While @of_node, @disable_sysfs and @priv are used for internal book | |
| 46 | * keeping, the remaining members form the core properties of the cache | |
| 47 | */ | |
| 48 | struct cacheinfo { | |
| e9a2ea5a | 49 | unsigned int id; |
| 246246cb SH |
50 | enum cache_type type; |
| 51 | unsigned int level; | |
| 52 | unsigned int coherency_line_size; | |
| 53 | unsigned int number_of_sets; | |
| 54 | unsigned int ways_of_associativity; | |
| 55 | unsigned int physical_line_partition; | |
| 56 | unsigned int size; | |
| 57 | cpumask_t shared_cpu_map; | |
| 58 | unsigned int attributes; | |
| 59 | #define CACHE_WRITE_THROUGH BIT(0) | |
| 60 | #define CACHE_WRITE_BACK BIT(1) | |
| 61 | #define CACHE_WRITE_POLICY_MASK \ | |
| 62 | (CACHE_WRITE_THROUGH | CACHE_WRITE_BACK) | |
| 63 | #define CACHE_READ_ALLOCATE BIT(2) | |
| 64 | #define CACHE_WRITE_ALLOCATE BIT(3) | |
| 65 | #define CACHE_ALLOCATE_POLICY_MASK \ | |
| 66 | (CACHE_READ_ALLOCATE | CACHE_WRITE_ALLOCATE) | |
| e9a2ea5a | 67 | #define CACHE_ID BIT(4) |
| 246246cb SH |
68 | |
| 69 | struct device_node *of_node; | |
| 70 | bool disable_sysfs; | |
| 71 | void *priv; | |
| 72 | }; | |
| 73 | ||
| 74 | struct cpu_cacheinfo { | |
| 75 | struct cacheinfo *info_list; | |
| 76 | unsigned int num_levels; | |
| 77 | unsigned int num_leaves; | |
| fac51482 | 78 | bool cpu_map_populated; |
| 246246cb SH |
79 | }; |
| 80 | ||
| 81 | /* | |
| 82 | * Helpers to make sure "func" is executed on the cpu whose cache | |
| 83 | * attributes are being detected | |
| 84 | */ | |
| 85 | #define DEFINE_SMP_CALL_CACHE_FUNCTION(func) \ | |
| 86 | static inline void _##func(void *ret) \ | |
| 87 | { \ | |
| 88 | int cpu = smp_processor_id(); \ | |
| 89 | *(int *)ret = __##func(cpu); \ | |
| 90 | } \ | |
| 91 | \ | |
| 92 | int func(unsigned int cpu) \ | |
| 93 | { \ | |
| 94 | int ret; \ | |
| 95 | smp_call_function_single(cpu, _##func, &ret, true); \ | |
| 96 | return ret; \ | |
| 97 | } | |
| 98 | ||
| 99 | struct cpu_cacheinfo *get_cpu_cacheinfo(unsigned int cpu); | |
| 100 | int init_cache_level(unsigned int cpu); | |
| 101 | int populate_cache_leaves(unsigned int cpu); | |
| 102 | ||
| 103 | const struct attribute_group *cache_get_priv_group(struct cacheinfo *this_leaf); | |
| 104 | ||
| 105 | #endif /* _LINUX_CACHEINFO_H */ |