71 lines
2.2 KiB
C
71 lines
2.2 KiB
C
/* 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 */
|