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/* 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 */
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