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