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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Cache coherency maintenance operation device drivers
*
* Copyright Huawei 2025
*/
#ifndef _LINUX_CACHE_COHERENCY_H_
#define _LINUX_CACHE_COHERENCY_H_
#include <linux/list.h>
#include <linux/kref.h>
#include <linux/types.h>
struct cc_inval_params {
phys_addr_t addr;
size_t size;
};
struct cache_coherency_ops_inst;
struct cache_coherency_ops {
int (*wbinv)(struct cache_coherency_ops_inst *cci,
struct cc_inval_params *invp);
int (*done)(struct cache_coherency_ops_inst *cci);
};
struct cache_coherency_ops_inst {
struct kref kref;
struct list_head node;
const struct cache_coherency_ops *ops;
};
int cache_coherency_ops_instance_register(struct cache_coherency_ops_inst *cci);
void cache_coherency_ops_instance_unregister(struct cache_coherency_ops_inst *cci);
struct cache_coherency_ops_inst *
_cache_coherency_ops_instance_alloc(const struct cache_coherency_ops *ops,
size_t size);
/**
* cache_coherency_ops_instance_alloc - Allocate cache coherency ops instance
* @ops: Cache maintenance operations
* @drv_struct: structure that contains the struct cache_coherency_ops_inst
* @member: Name of the struct cache_coherency_ops_inst member in @drv_struct.
*
* This allocates a driver specific structure and initializes the
* cache_coherency_ops_inst embedded in the drv_struct. Upon success the
* pointer must be freed via cache_coherency_ops_instance_put().
*
* Returns a &drv_struct * on success, %NULL on error.
*/
#define cache_coherency_ops_instance_alloc(ops, drv_struct, member) \
({ \
static_assert(__same_type(struct cache_coherency_ops_inst, \
((drv_struct *)NULL)->member)); \
static_assert(offsetof(drv_struct, member) == 0); \
(drv_struct *)_cache_coherency_ops_instance_alloc(ops, \
sizeof(drv_struct)); \
})
void cache_coherency_ops_instance_put(struct cache_coherency_ops_inst *cci);
#endif
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