Release 4.18 include/linux/cacheinfo.h

/* SPDX-License-Identifier: GPL-2.0 */
#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
 * @fw_token: Unique value used to determine if different cacheinfo
 *      structures represent a single hardware cache instance.
 * @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)
	
void *fw_token;
	
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);
int cache_setup_acpi(unsigned int cpu);
#ifndef CONFIG_ACPI_PPTT
/*
 * acpi_find_last_cache_level is only called on ACPI enabled
 * platforms using the PPTT for topology. This means that if
 * the platform supports other firmware configuration methods
 * we need to stub out the call when ACPI is disabled.
 * ACPI enabled platforms not using PPTT won't be making calls
 * to this function so we need not worry about them.
 */


static inline int acpi_find_last_cache_level(unsigned int cpu)
{
	return 0;
}
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#else
int acpi_find_last_cache_level(unsigned int cpu);
#endif

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

#endif /* _LINUX_CACHEINFO_H */
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Directory: include/linux

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