| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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| 2 | /* |
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| 3 | * Cache coherency maintenance operation device drivers |
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| 4 | * |
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| 5 | * Copyright Huawei 2025 |
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| 6 | */ |
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| 7 | #ifndef _LINUX_CACHE_COHERENCY_H_ |
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| 8 | #define _LINUX_CACHE_COHERENCY_H_ |
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| 9 | |
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| 10 | #include <linux/list.h> |
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| 11 | #include <linux/kref.h> |
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| 12 | #include <linux/types.h> |
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| 13 | |
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| 14 | struct cc_inval_params { |
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| 15 | phys_addr_t addr; |
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| 16 | size_t size; |
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| 17 | }; |
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| 18 | |
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| 19 | struct cache_coherency_ops_inst; |
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| 20 | |
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| 21 | struct cache_coherency_ops { |
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| 22 | int (*wbinv)(struct cache_coherency_ops_inst *cci, |
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| 23 | struct cc_inval_params *invp); |
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| 24 | int (*done)(struct cache_coherency_ops_inst *cci); |
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| 25 | }; |
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| 26 | |
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| 27 | struct cache_coherency_ops_inst { |
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| 28 | struct kref kref; |
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| 29 | struct list_head node; |
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| 30 | const struct cache_coherency_ops *ops; |
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| 31 | }; |
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| 32 | |
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| 33 | int cache_coherency_ops_instance_register(struct cache_coherency_ops_inst *cci); |
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| 34 | void cache_coherency_ops_instance_unregister(struct cache_coherency_ops_inst *cci); |
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| 35 | |
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| 36 | struct cache_coherency_ops_inst * |
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| 37 | _cache_coherency_ops_instance_alloc(const struct cache_coherency_ops *ops, |
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| 38 | size_t size); |
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| 39 | /** |
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| 40 | * cache_coherency_ops_instance_alloc - Allocate cache coherency ops instance |
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| 41 | * @ops: Cache maintenance operations |
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| 42 | * @drv_struct: structure that contains the struct cache_coherency_ops_inst |
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| 43 | * @member: Name of the struct cache_coherency_ops_inst member in @drv_struct. |
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| 44 | * |
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| 45 | * This allocates a driver specific structure and initializes the |
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| 46 | * cache_coherency_ops_inst embedded in the drv_struct. Upon success the |
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| 47 | * pointer must be freed via cache_coherency_ops_instance_put(). |
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| 48 | * |
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| 49 | * Returns a &drv_struct * on success, %NULL on error. |
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| 50 | */ |
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| 51 | #define cache_coherency_ops_instance_alloc(ops, drv_struct, member) \ |
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| 52 | ({ \ |
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| 53 | static_assert(__same_type(struct cache_coherency_ops_inst, \ |
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| 54 | ((drv_struct *)NULL)->member)); \ |
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| 55 | static_assert(offsetof(drv_struct, member) == 0); \ |
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| 56 | (drv_struct *)_cache_coherency_ops_instance_alloc(ops, \ |
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| 57 | sizeof(drv_struct)); \ |
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| 58 | }) |
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| 59 | void cache_coherency_ops_instance_put(struct cache_coherency_ops_inst *cci); |
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| 60 | |
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| 61 | #endif |
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| 62 | |
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