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TOMOYO Linux Cross Reference
Linux/include/linux/cacheinfo.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  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
 22  * @id: This cache's id. It is unique among caches with the same (type, level).
 23  * @type: type of the cache - data, inst or unified
 24  * @level: represents the hierarchy in the multi-level cache
 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 {
 49         unsigned int id;
 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)
 67 #define CACHE_ID                BIT(4)
 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;
 78         bool cpu_map_populated;
 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 */
106 

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