linux/drivers/mtd/mtdoops.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * MTD Oops/Panic logger
 *
 * Copyright © 2007 Nokia Corporation. All rights reserved.
 *
 * Author: Richard Purdie <[email protected]>
 */

#define pr_fmt(fmt) …

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/console.h>
#include <linux/vmalloc.h>
#include <linux/workqueue.h>
#include <linux/sched.h>
#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>

/* Maximum MTD partition size */
#define MTDOOPS_MAX_MTD_SIZE …

static unsigned long record_size = …;
module_param(record_size, ulong, 0400);
MODULE_PARM_DESC(…) …;

static char mtddev[80];
module_param_string(…);
MODULE_PARM_DESC(…) …;

static int dump_oops = …;
module_param(dump_oops, int, 0600);
MODULE_PARM_DESC(…) …;

#define MTDOOPS_KERNMSG_MAGIC_v1 …
#define MTDOOPS_KERNMSG_MAGIC_v2 …

struct mtdoops_hdr { … } __packed;

static struct mtdoops_context { … } oops_cxt;

static void mark_page_used(struct mtdoops_context *cxt, int page)
{ … }

static void mark_page_unused(struct mtdoops_context *cxt, int page)
{ … }

static int page_is_used(struct mtdoops_context *cxt, int page)
{ … }

static int mtdoops_erase_block(struct mtdoops_context *cxt, int offset)
{ … }

static void mtdoops_erase(struct mtdoops_context *cxt)
{ … }

/* Scheduled work - when we can't proceed without erasing a block */
static void mtdoops_workfunc_erase(struct work_struct *work)
{ … }

static void mtdoops_inc_counter(struct mtdoops_context *cxt, int panic)
{ … }

static void mtdoops_write(struct mtdoops_context *cxt, int panic)
{ … }

static void mtdoops_workfunc_write(struct work_struct *work)
{ … }

static void find_next_position(struct mtdoops_context *cxt)
{ … }

static void mtdoops_do_dump(struct kmsg_dumper *dumper,
			    enum kmsg_dump_reason reason)
{ … }

static void mtdoops_notify_add(struct mtd_info *mtd)
{ … }

static void mtdoops_notify_remove(struct mtd_info *mtd)
{ … }


static struct mtd_notifier mtdoops_notifier = …;

static int __init mtdoops_init(void)
{ … }

static void __exit mtdoops_exit(void)
{ … }


module_init(…) …;
module_exit(mtdoops_exit);

MODULE_LICENSE(…) …;
MODULE_AUTHOR(…) …;
MODULE_DESCRIPTION(…) …;