[mirror_ubuntu-artful-kernel.git] / include / linux / cacheinfo.h

#ifndef _LINUX_CACHEINFO_H
#define _LINUX_CACHEINFO_H

#include <linux/bitops.h>
#include <linux/cpumask.h>
#include <linux/smp.h>

struct device_node;
struct attribute;

enum cache_type {
	CACHE_TYPE_NOCACHE = 0,
	CACHE_TYPE_INST = BIT(0),
	CACHE_TYPE_DATA = BIT(1),
	CACHE_TYPE_SEPARATE = CACHE_TYPE_INST | CACHE_TYPE_DATA,
	CACHE_TYPE_UNIFIED = BIT(2),
};

/**
 * struct cacheinfo - represent a cache leaf node
 * @id: This cache's id. It is unique among caches with the same (type, level).
 * @type: type of the cache - data, inst or unified
 * @level: represents the hierarchy in the multi-level cache
 * @coherency_line_size: size of each cache line usually representing
 *	the minimum amount of data that gets transferred from memory
 * @number_of_sets: total number of sets, a set is a collection of cache
 *	lines sharing the same index
 * @ways_of_associativity: number of ways in which a particular memory
 *	block can be placed in the cache
 * @physical_line_partition: number of physical cache lines sharing the
 *	same cachetag
 * @size: Total size of the cache
 * @shared_cpu_map: logical cpumask representing all the cpus sharing
 *	this cache node
 * @attributes: bitfield representing various cache attributes
 * @of_node: if devicetree is used, this represents either the cpu node in
 *	case there's no explicit cache node or the cache node itself in the
 *	device tree
 * @disable_sysfs: indicates whether this node is visible to the user via
 *	sysfs or not
 * @priv: pointer to any private data structure specific to particular
 *	cache design
 *
 * While @of_node, @disable_sysfs and @priv are used for internal book
 * keeping, the remaining members form the core properties of the cache
 */
struct cacheinfo {
	unsigned int id;
	enum cache_type type;
	unsigned int level;
	unsigned int coherency_line_size;
	unsigned int number_of_sets;
	unsigned int ways_of_associativity;
	unsigned int physical_line_partition;
	unsigned int size;
	cpumask_t shared_cpu_map;
	unsigned int attributes;
#define CACHE_WRITE_THROUGH	BIT(0)
#define CACHE_WRITE_BACK	BIT(1)
#define CACHE_WRITE_POLICY_MASK		\
	(CACHE_WRITE_THROUGH | CACHE_WRITE_BACK)
#define CACHE_READ_ALLOCATE	BIT(2)
#define CACHE_WRITE_ALLOCATE	BIT(3)
#define CACHE_ALLOCATE_POLICY_MASK	\
	(CACHE_READ_ALLOCATE | CACHE_WRITE_ALLOCATE)
#define CACHE_ID		BIT(4)

	struct device_node *of_node;
	bool disable_sysfs;
	void *priv;
};

struct cpu_cacheinfo {
	struct cacheinfo *info_list;
	unsigned int num_levels;
	unsigned int num_leaves;
	bool cpu_map_populated;
};

/*
 * Helpers to make sure "func" is executed on the cpu whose cache
 * attributes are being detected
 */
#define DEFINE_SMP_CALL_CACHE_FUNCTION(func)			\
static inline void _##func(void *ret)				\
{								\
	int cpu = smp_processor_id();				\
	*(int *)ret = __##func(cpu);				\
}								\
								\
int func(unsigned int cpu)					\
{								\
	int ret;						\
	smp_call_function_single(cpu, _##func, &ret, true);	\
	return ret;						\
}

struct cpu_cacheinfo *get_cpu_cacheinfo(unsigned int cpu);
int init_cache_level(unsigned int cpu);
int populate_cache_leaves(unsigned int cpu);

const struct attribute_group *cache_get_priv_group(struct cacheinfo *this_leaf);

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