mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-26 22:24:09 +08:00
16263ff6c7
Provide a devres interface for initializing a badblocks instance. The pmem driver has several scenarios where it will be beneficial to have this structure automatically freed when the device is disabled / fails probe. Signed-off-by: Dan Williams <dan.j.williams@intel.com>
66 lines
2.1 KiB
C
66 lines
2.1 KiB
C
#ifndef _LINUX_BADBLOCKS_H
|
|
#define _LINUX_BADBLOCKS_H
|
|
|
|
#include <linux/seqlock.h>
|
|
#include <linux/device.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/stddef.h>
|
|
#include <linux/types.h>
|
|
|
|
#define BB_LEN_MASK (0x00000000000001FFULL)
|
|
#define BB_OFFSET_MASK (0x7FFFFFFFFFFFFE00ULL)
|
|
#define BB_ACK_MASK (0x8000000000000000ULL)
|
|
#define BB_MAX_LEN 512
|
|
#define BB_OFFSET(x) (((x) & BB_OFFSET_MASK) >> 9)
|
|
#define BB_LEN(x) (((x) & BB_LEN_MASK) + 1)
|
|
#define BB_ACK(x) (!!((x) & BB_ACK_MASK))
|
|
#define BB_MAKE(a, l, ack) (((a)<<9) | ((l)-1) | ((u64)(!!(ack)) << 63))
|
|
|
|
/* Bad block numbers are stored sorted in a single page.
|
|
* 64bits is used for each block or extent.
|
|
* 54 bits are sector number, 9 bits are extent size,
|
|
* 1 bit is an 'acknowledged' flag.
|
|
*/
|
|
#define MAX_BADBLOCKS (PAGE_SIZE/8)
|
|
|
|
struct badblocks {
|
|
struct device *dev; /* set by devm_init_badblocks */
|
|
int count; /* count of bad blocks */
|
|
int unacked_exist; /* there probably are unacknowledged
|
|
* bad blocks. This is only cleared
|
|
* when a read discovers none
|
|
*/
|
|
int shift; /* shift from sectors to block size
|
|
* a -ve shift means badblocks are
|
|
* disabled.*/
|
|
u64 *page; /* badblock list */
|
|
int changed;
|
|
seqlock_t lock;
|
|
sector_t sector;
|
|
sector_t size; /* in sectors */
|
|
};
|
|
|
|
int badblocks_check(struct badblocks *bb, sector_t s, int sectors,
|
|
sector_t *first_bad, int *bad_sectors);
|
|
int badblocks_set(struct badblocks *bb, sector_t s, int sectors,
|
|
int acknowledged);
|
|
int badblocks_clear(struct badblocks *bb, sector_t s, int sectors);
|
|
void ack_all_badblocks(struct badblocks *bb);
|
|
ssize_t badblocks_show(struct badblocks *bb, char *page, int unack);
|
|
ssize_t badblocks_store(struct badblocks *bb, const char *page, size_t len,
|
|
int unack);
|
|
int badblocks_init(struct badblocks *bb, int enable);
|
|
void badblocks_exit(struct badblocks *bb);
|
|
struct device;
|
|
int devm_init_badblocks(struct device *dev, struct badblocks *bb);
|
|
static inline void devm_exit_badblocks(struct device *dev, struct badblocks *bb)
|
|
{
|
|
if (bb->dev != dev) {
|
|
dev_WARN_ONCE(dev, 1, "%s: badblocks instance not associated\n",
|
|
__func__);
|
|
return;
|
|
}
|
|
badblocks_exit(bb);
|
|
}
|
|
#endif
|