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mtd: mtdoops: Add a timestamp to the mtdoops header.

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On some systems, the oops only has relative time from boot.

Signed-off-by: Jean-Marc Eurin <jmeurin@google.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20220425160927.3823016-1-jmeurin@google.com
This commit is contained in:
Jean-Marc Eurin 2022-04-25 09:09:27 -07:00 committed by Miquel Raynal
parent 0bd359ee71
commit aa641a22bb
1 changed files with 9 additions and 3 deletions
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12
drivers/mtd/mtdoops.c
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@ -16,6 +16,7 @@
#include <linux/wait.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/timekeeping.h>
#include <linux/mtd/mtd.h>
#include <linux/kmsg_dump.h>
@ -37,11 +38,13 @@ module_param(dump_oops, int, 0600);
MODULE_PARM_DESC(dump_oops,
"set to 1 to dump oopses, 0 to only dump panics (default 1)");
#define MTDOOPS_KERNMSG_MAGIC 0x5d005d00
#define MTDOOPS_KERNMSG_MAGIC_v1 0x5d005d00 /* Original */
#define MTDOOPS_KERNMSG_MAGIC_v2 0x5d005e00 /* Adds the timestamp */
struct mtdoops_hdr {
u32 seq;
u32 magic;
ktime_t timestamp;
} __packed;
static struct mtdoops_context {
@ -191,7 +194,8 @@ static void mtdoops_write(struct mtdoops_context *cxt, int panic)
/* Add mtdoops header to the buffer */
hdr = (struct mtdoops_hdr *)cxt->oops_buf;
hdr->seq = cxt->nextcount;
hdr->magic = MTDOOPS_KERNMSG_MAGIC;
hdr->magic = MTDOOPS_KERNMSG_MAGIC_v2;
hdr->timestamp = ktime_get_real();
if (panic) {
ret = mtd_panic_write(mtd, cxt->nextpage * record_size,
@ -247,7 +251,9 @@ static void find_next_position(struct mtdoops_context *cxt)
if (hdr.seq == 0xffffffff && hdr.magic == 0xffffffff)
mark_page_unused(cxt, page);
if (hdr.seq == 0xffffffff || hdr.magic != MTDOOPS_KERNMSG_MAGIC)
if (hdr.seq == 0xffffffff ||
(hdr.magic != MTDOOPS_KERNMSG_MAGIC_v1 &&
hdr.magic != MTDOOPS_KERNMSG_MAGIC_v2))
continue;
if (maxcount == 0xffffffff) {
maxcount = hdr.seq;