/* SPDX-License-Identifier: GPL-2.0-or-later */#ifndef _PCACHE_CACHE_DEV_H#define _PCACHE_CACHE_DEV_H #include <linux/device.h>#include <linux/device-mapper.h> #include "pcache_internal.h" #define PCACHE_MAGIC				0x65B05EFA96C596EFULL #define PCACHE_SB_OFF				(4 * PCACHE_KB)#define PCACHE_SB_SIZE				(4 * PCACHE_KB) #define PCACHE_CACHE_INFO_OFF			(PCACHE_SB_OFF + PCACHE_SB_SIZE)#define PCACHE_CACHE_INFO_SIZE			(4 * PCACHE_KB) #define PCACHE_CACHE_CTRL_OFF			(PCACHE_CACHE_INFO_OFF + (PCACHE_CACHE_INFO_SIZE * PCACHE_META_INDEX_MAX))#define PCACHE_CACHE_CTRL_SIZE			(4 * PCACHE_KB) #define PCACHE_SEGMENTS_OFF			(PCACHE_CACHE_CTRL_OFF + PCACHE_CACHE_CTRL_SIZE)#define PCACHE_SEG_INFO_SIZE			(4 * PCACHE_KB) #define PCACHE_CACHE_DEV_SIZE_MIN		(512 * PCACHE_MB)	/* 512 MB */#define PCACHE_SEG_SIZE				(16 * PCACHE_MB)	/* Size of each PCACHE segment (16 MB) */ #define CACHE_DEV_SB(cache_dev)			((struct pcache_sb *)(cache_dev->mapping + PCACHE_SB_OFF))#define CACHE_DEV_CACHE_INFO(cache_dev)		((void *)cache_dev->mapping + PCACHE_CACHE_INFO_OFF)#define CACHE_DEV_CACHE_CTRL(cache_dev)		((void *)cache_dev->mapping + PCACHE_CACHE_CTRL_OFF)#define CACHE_DEV_SEGMENTS(cache_dev)		((void *)cache_dev->mapping + PCACHE_SEGMENTS_OFF)#define CACHE_DEV_SEGMENT(cache_dev, id)	((void *)CACHE_DEV_SEGMENTS(cache_dev) + (u64)id * PCACHE_SEG_SIZE) /* * PCACHE SB flags configured during formatting * * The PCACHE_SB_F_xxx flags define registration requirements based on cache_dev * formatting. For a machine to register a cache_dev: * - PCACHE_SB_F_BIGENDIAN: Requires a big-endian machine. */#define PCACHE_SB_F_BIGENDIAN			BIT(0) struct pcache_sb {	__le32 crc;	__le32 flags;	__le64 magic; 	__le32 seg_num;}; struct pcache_cache_dev {	u32				sb_flags;	u32				seg_num;	void				*mapping;	bool				use_vmap; 	struct dm_dev			*dm_dev; 	struct mutex			seg_lock;	unsigned long			*seg_bitmap;}; struct dm_pcache;int cache_dev_start(struct dm_pcache *pcache);void cache_dev_stop(struct dm_pcache *pcache); void cache_dev_zero_range(struct pcache_cache_dev *cache_dev, void *pos, u32 size); int cache_dev_get_empty_segment_id(struct pcache_cache_dev *cache_dev, u32 *seg_id); #endif /* _PCACHE_CACHE_DEV_H */