cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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badblocks.h (2188B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2#ifndef _LINUX_BADBLOCKS_H
      3#define _LINUX_BADBLOCKS_H
      4
      5#include <linux/seqlock.h>
      6#include <linux/device.h>
      7#include <linux/kernel.h>
      8#include <linux/stddef.h>
      9#include <linux/types.h>
     10
     11#define BB_LEN_MASK	(0x00000000000001FFULL)
     12#define BB_OFFSET_MASK	(0x7FFFFFFFFFFFFE00ULL)
     13#define BB_ACK_MASK	(0x8000000000000000ULL)
     14#define BB_MAX_LEN	512
     15#define BB_OFFSET(x)	(((x) & BB_OFFSET_MASK) >> 9)
     16#define BB_LEN(x)	(((x) & BB_LEN_MASK) + 1)
     17#define BB_ACK(x)	(!!((x) & BB_ACK_MASK))
     18#define BB_MAKE(a, l, ack) (((a)<<9) | ((l)-1) | ((u64)(!!(ack)) << 63))
     19
     20/* Bad block numbers are stored sorted in a single page.
     21 * 64bits is used for each block or extent.
     22 * 54 bits are sector number, 9 bits are extent size,
     23 * 1 bit is an 'acknowledged' flag.
     24 */
     25#define MAX_BADBLOCKS	(PAGE_SIZE/8)
     26
     27struct badblocks {
     28	struct device *dev;	/* set by devm_init_badblocks */
     29	int count;		/* count of bad blocks */
     30	int unacked_exist;	/* there probably are unacknowledged
     31				 * bad blocks.  This is only cleared
     32				 * when a read discovers none
     33				 */
     34	int shift;		/* shift from sectors to block size
     35				 * a -ve shift means badblocks are
     36				 * disabled.*/
     37	u64 *page;		/* badblock list */
     38	int changed;
     39	seqlock_t lock;
     40	sector_t sector;
     41	sector_t size;		/* in sectors */
     42};
     43
     44int badblocks_check(struct badblocks *bb, sector_t s, int sectors,
     45		   sector_t *first_bad, int *bad_sectors);
     46int badblocks_set(struct badblocks *bb, sector_t s, int sectors,
     47			int acknowledged);
     48int badblocks_clear(struct badblocks *bb, sector_t s, int sectors);
     49void ack_all_badblocks(struct badblocks *bb);
     50ssize_t badblocks_show(struct badblocks *bb, char *page, int unack);
     51ssize_t badblocks_store(struct badblocks *bb, const char *page, size_t len,
     52			int unack);
     53int badblocks_init(struct badblocks *bb, int enable);
     54void badblocks_exit(struct badblocks *bb);
     55struct device;
     56int devm_init_badblocks(struct device *dev, struct badblocks *bb);
     57static inline void devm_exit_badblocks(struct device *dev, struct badblocks *bb)
     58{
     59	if (bb->dev != dev) {
     60		dev_WARN_ONCE(dev, 1, "%s: badblocks instance not associated\n",
     61				__func__);
     62		return;
     63	}
     64	badblocks_exit(bb);
     65}
     66#endif