1 #ifndef _LINUX_CACHEINFO_H
2 #define _LINUX_CACHEINFO_H
4 #include <linux/bitops.h>
5 #include <linux/cpumask.h>
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),
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
31 * @size: Total size of the cache
32 * @shared_cpu_map: logical cpumask representing all the cpus sharing
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
38 * @disable_sysfs: indicates whether this node is visible to the user via
40 * @priv: pointer to any private data structure specific to particular
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
49 unsigned int coherency_line_size
;
50 unsigned int number_of_sets
;
51 unsigned int ways_of_associativity
;
52 unsigned int physical_line_partition
;
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)
65 struct device_node
*of_node
;
70 struct cpu_cacheinfo
{
71 struct cacheinfo
*info_list
;
72 unsigned int num_levels
;
73 unsigned int num_leaves
;
77 * Helpers to make sure "func" is executed on the cpu whose cache
78 * attributes are being detected
80 #define DEFINE_SMP_CALL_CACHE_FUNCTION(func) \
81 static inline void _##func(void *ret) \
83 int cpu = smp_processor_id(); \
84 *(int *)ret = __##func(cpu); \
87 int func(unsigned int cpu) \
90 smp_call_function_single(cpu, _##func, &ret, true); \
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
);
98 const struct attribute_group
*cache_get_priv_group(struct cacheinfo
*this_leaf
);
100 #endif /* _LINUX_CACHEINFO_H */
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