2019-05-30 02:57:50 +03:00
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// SPDX-License-Identifier: GPL-2.0-only
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2007-05-29 16:31:42 +04:00
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/*
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* MTD Oops/Panic logger
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*
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2010-08-08 23:58:20 +04:00
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* Copyright © 2007 Nokia Corporation. All rights reserved.
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2007-05-29 16:31:42 +04:00
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*
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* Author: Richard Purdie <rpurdie@openedhand.com>
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/console.h>
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#include <linux/vmalloc.h>
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#include <linux/workqueue.h>
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#include <linux/sched.h>
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#include <linux/wait.h>
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2008-02-06 13:17:50 +03:00
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#include <linux/delay.h>
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2008-02-07 13:50:57 +03:00
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#include <linux/interrupt.h>
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2022-04-25 19:09:27 +03:00
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#include <linux/timekeeping.h>
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2007-05-29 16:31:42 +04:00
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#include <linux/mtd/mtd.h>
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2009-11-03 16:19:03 +03:00
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#include <linux/kmsg_dump.h>
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2007-05-29 16:31:42 +04:00
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2009-11-03 09:08:41 +03:00
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/* Maximum MTD partition size */
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#define MTDOOPS_MAX_MTD_SIZE (8 * 1024 * 1024)
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2009-10-29 15:41:19 +03:00
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static unsigned long record_size = 4096;
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module_param(record_size, ulong, 0400);
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MODULE_PARM_DESC(record_size,
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"record size for MTD OOPS pages in bytes (default 4096)");
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2007-05-29 16:31:42 +04:00
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2009-11-03 16:19:03 +03:00
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static char mtddev[80];
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module_param_string(mtddev, mtddev, 80, 0400);
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MODULE_PARM_DESC(mtddev,
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"name or index number of the MTD device to use");
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static int dump_oops = 1;
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module_param(dump_oops, int, 0600);
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MODULE_PARM_DESC(dump_oops,
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"set to 1 to dump oopses, 0 to only dump panics (default 1)");
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2022-04-25 19:09:27 +03:00
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#define MTDOOPS_KERNMSG_MAGIC_v1 0x5d005d00 /* Original */
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#define MTDOOPS_KERNMSG_MAGIC_v2 0x5d005e00 /* Adds the timestamp */
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2022-04-22 02:42:43 +03:00
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struct mtdoops_hdr {
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u32 seq;
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u32 magic;
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2022-04-25 19:09:27 +03:00
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ktime_t timestamp;
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2022-04-22 02:42:43 +03:00
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} __packed;
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2008-04-19 00:44:11 +04:00
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static struct mtdoops_context {
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2009-11-03 16:19:03 +03:00
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struct kmsg_dumper dump;
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2007-05-29 16:31:42 +04:00
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int mtd_index;
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2008-01-29 14:27:11 +03:00
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struct work_struct work_erase;
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struct work_struct work_write;
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2007-05-29 16:31:42 +04:00
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struct mtd_info *mtd;
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int oops_pages;
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int nextpage;
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int nextcount;
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2009-10-29 15:41:11 +03:00
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unsigned long *oops_page_used;
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2007-05-29 16:31:42 +04:00
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2021-03-03 13:15:15 +03:00
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unsigned long oops_buf_busy;
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2007-05-29 16:31:42 +04:00
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void *oops_buf;
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} oops_cxt;
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2009-10-29 15:41:11 +03:00
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static void mark_page_used(struct mtdoops_context *cxt, int page)
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{
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set_bit(page, cxt->oops_page_used);
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}
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static void mark_page_unused(struct mtdoops_context *cxt, int page)
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{
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clear_bit(page, cxt->oops_page_used);
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}
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static int page_is_used(struct mtdoops_context *cxt, int page)
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{
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return test_bit(page, cxt->oops_page_used);
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}
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static int mtdoops_erase_block(struct mtdoops_context *cxt, int offset)
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2007-05-29 16:31:42 +04:00
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{
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2009-10-29 15:41:11 +03:00
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struct mtd_info *mtd = cxt->mtd;
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u32 start_page_offset = mtd_div_by_eb(offset, mtd) * mtd->erasesize;
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2009-10-29 15:41:19 +03:00
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u32 start_page = start_page_offset / record_size;
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u32 erase_pages = mtd->erasesize / record_size;
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2007-05-29 16:31:42 +04:00
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struct erase_info erase;
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int ret;
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2009-10-29 15:41:11 +03:00
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int page;
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2007-05-29 16:31:42 +04:00
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erase.addr = offset;
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2008-01-29 13:25:55 +03:00
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erase.len = mtd->erasesize;
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2007-05-29 16:31:42 +04:00
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2011-12-23 17:25:39 +04:00
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ret = mtd_erase(mtd, &erase);
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2007-05-29 16:31:42 +04:00
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if (ret) {
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2009-10-11 14:40:40 +04:00
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printk(KERN_WARNING "mtdoops: erase of region [0x%llx, 0x%llx] on \"%s\" failed\n",
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(unsigned long long)erase.addr,
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2009-11-03 16:19:03 +03:00
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(unsigned long long)erase.len, mtddev);
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2007-05-29 16:31:42 +04:00
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return ret;
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}
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2009-10-29 15:41:11 +03:00
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/* Mark pages as unused */
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for (page = start_page; page < start_page + erase_pages; page++)
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mark_page_unused(cxt, page);
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2007-05-29 16:31:42 +04:00
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return 0;
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}
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2008-01-29 14:27:11 +03:00
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static void mtdoops_inc_counter(struct mtdoops_context *cxt)
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2007-05-29 16:31:42 +04:00
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{
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cxt->nextpage++;
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2008-07-26 12:17:41 +04:00
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if (cxt->nextpage >= cxt->oops_pages)
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2007-05-29 16:31:42 +04:00
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cxt->nextpage = 0;
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cxt->nextcount++;
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if (cxt->nextcount == 0xffffffff)
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cxt->nextcount = 0;
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2009-10-29 15:41:11 +03:00
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if (page_is_used(cxt, cxt->nextpage)) {
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2008-01-29 14:27:11 +03:00
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schedule_work(&cxt->work_erase);
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return;
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}
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2007-05-29 16:31:42 +04:00
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2009-10-11 14:40:40 +04:00
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printk(KERN_DEBUG "mtdoops: ready %d, %d (no erase)\n",
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cxt->nextpage, cxt->nextcount);
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2007-05-29 16:31:42 +04:00
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}
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2008-01-29 14:27:11 +03:00
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/* Scheduled work - when we can't proceed without erasing a block */
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static void mtdoops_workfunc_erase(struct work_struct *work)
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2007-05-29 16:31:42 +04:00
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{
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2008-01-29 14:27:11 +03:00
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struct mtdoops_context *cxt =
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container_of(work, struct mtdoops_context, work_erase);
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2007-05-29 16:31:42 +04:00
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struct mtd_info *mtd = cxt->mtd;
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int i = 0, j, ret, mod;
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/* We were unregistered */
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if (!mtd)
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return;
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2009-10-29 15:41:19 +03:00
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mod = (cxt->nextpage * record_size) % mtd->erasesize;
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2007-05-29 16:31:42 +04:00
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if (mod != 0) {
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2009-10-29 15:41:19 +03:00
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cxt->nextpage = cxt->nextpage + ((mtd->erasesize - mod) / record_size);
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2008-07-26 12:17:41 +04:00
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if (cxt->nextpage >= cxt->oops_pages)
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2007-05-29 16:31:42 +04:00
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cxt->nextpage = 0;
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}
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2012-05-12 00:30:33 +04:00
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while ((ret = mtd_block_isbad(mtd, cxt->nextpage * record_size)) > 0) {
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2007-05-29 16:31:42 +04:00
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badblock:
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2009-10-29 15:41:19 +03:00
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printk(KERN_WARNING "mtdoops: bad block at %08lx\n",
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cxt->nextpage * record_size);
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2007-05-29 16:31:42 +04:00
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i++;
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2009-10-29 15:41:19 +03:00
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cxt->nextpage = cxt->nextpage + (mtd->erasesize / record_size);
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2008-07-26 12:17:41 +04:00
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if (cxt->nextpage >= cxt->oops_pages)
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2007-05-29 16:31:42 +04:00
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cxt->nextpage = 0;
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2009-10-29 15:41:19 +03:00
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if (i == cxt->oops_pages / (mtd->erasesize / record_size)) {
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2009-10-11 14:40:40 +04:00
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printk(KERN_ERR "mtdoops: all blocks bad!\n");
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2007-05-29 16:31:42 +04:00
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return;
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}
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}
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2012-05-12 00:30:33 +04:00
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if (ret < 0) {
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printk(KERN_ERR "mtdoops: mtd_block_isbad failed, aborting\n");
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return;
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}
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2007-05-29 16:31:42 +04:00
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for (j = 0, ret = -1; (j < 3) && (ret < 0); j++)
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2009-10-29 15:41:19 +03:00
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ret = mtdoops_erase_block(cxt, cxt->nextpage * record_size);
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2007-05-29 16:31:42 +04:00
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2008-01-29 14:27:09 +03:00
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if (ret >= 0) {
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2009-10-11 14:40:40 +04:00
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printk(KERN_DEBUG "mtdoops: ready %d, %d\n",
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cxt->nextpage, cxt->nextcount);
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2008-01-29 14:27:09 +03:00
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return;
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2007-05-29 16:31:42 +04:00
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}
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2012-02-03 13:23:57 +04:00
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if (ret == -EIO) {
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2011-12-23 21:37:38 +04:00
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ret = mtd_block_markbad(mtd, cxt->nextpage * record_size);
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2012-02-03 13:23:57 +04:00
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if (ret < 0 && ret != -EOPNOTSUPP) {
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2009-10-11 14:40:40 +04:00
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printk(KERN_ERR "mtdoops: block_markbad failed, aborting\n");
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2008-01-29 14:27:09 +03:00
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return;
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}
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}
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goto badblock;
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2007-05-29 16:31:42 +04:00
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}
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2008-02-06 13:17:50 +03:00
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static void mtdoops_write(struct mtdoops_context *cxt, int panic)
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2007-05-29 16:31:42 +04:00
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{
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2008-01-29 14:27:11 +03:00
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struct mtd_info *mtd = cxt->mtd;
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size_t retlen;
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2022-04-22 02:42:43 +03:00
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struct mtdoops_hdr *hdr;
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2008-01-29 14:27:11 +03:00
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int ret;
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2007-05-29 16:31:42 +04:00
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2021-03-03 13:15:15 +03:00
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if (test_and_set_bit(0, &cxt->oops_buf_busy))
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return;
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2009-11-03 16:19:03 +03:00
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/* Add mtdoops header to the buffer */
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2022-04-22 02:42:43 +03:00
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hdr = (struct mtdoops_hdr *)cxt->oops_buf;
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hdr->seq = cxt->nextcount;
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2022-04-25 19:09:27 +03:00
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hdr->magic = MTDOOPS_KERNMSG_MAGIC_v2;
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hdr->timestamp = ktime_get_real();
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2008-01-29 14:27:11 +03:00
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2011-12-28 19:27:18 +04:00
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if (panic) {
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2011-12-23 20:03:17 +04:00
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ret = mtd_panic_write(mtd, cxt->nextpage * record_size,
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record_size, &retlen, cxt->oops_buf);
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2011-12-28 19:27:18 +04:00
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if (ret == -EOPNOTSUPP) {
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printk(KERN_ERR "mtdoops: Cannot write from panic without panic_write\n");
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2021-03-03 13:15:15 +03:00
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goto out;
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2011-12-28 19:27:18 +04:00
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}
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} else
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2011-12-23 19:35:41 +04:00
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ret = mtd_write(mtd, cxt->nextpage * record_size,
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record_size, &retlen, cxt->oops_buf);
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2008-01-29 14:27:11 +03:00
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2009-10-29 15:41:19 +03:00
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if (retlen != record_size || ret < 0)
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printk(KERN_ERR "mtdoops: write failure at %ld (%td of %ld written), error %d\n",
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cxt->nextpage * record_size, retlen, record_size, ret);
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2009-10-29 15:41:11 +03:00
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mark_page_used(cxt, cxt->nextpage);
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2009-11-03 16:19:03 +03:00
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memset(cxt->oops_buf, 0xff, record_size);
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2008-01-29 14:27:11 +03:00
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mtdoops_inc_counter(cxt);
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2021-03-03 13:15:15 +03:00
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out:
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clear_bit(0, &cxt->oops_buf_busy);
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2008-02-06 13:17:50 +03:00
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}
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static void mtdoops_workfunc_write(struct work_struct *work)
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{
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struct mtdoops_context *cxt =
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container_of(work, struct mtdoops_context, work_write);
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mtdoops_write(cxt, 0);
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2009-10-11 14:40:40 +04:00
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}
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2007-05-29 16:31:42 +04:00
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2008-01-29 14:27:11 +03:00
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static void find_next_position(struct mtdoops_context *cxt)
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2007-05-29 16:31:42 +04:00
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{
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struct mtd_info *mtd = cxt->mtd;
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2022-04-22 02:42:43 +03:00
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struct mtdoops_hdr hdr;
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2008-01-29 14:27:09 +03:00
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int ret, page, maxpos = 0;
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2022-04-22 02:42:43 +03:00
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u32 maxcount = 0xffffffff;
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2007-05-29 16:31:42 +04:00
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size_t retlen;
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for (page = 0; page < cxt->oops_pages; page++) {
|
2012-02-03 13:23:57 +04:00
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if (mtd_block_isbad(mtd, page * record_size))
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2011-12-02 17:07:17 +04:00
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continue;
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2009-10-29 15:41:11 +03:00
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/* Assume the page is used */
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mark_page_used(cxt, page);
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2022-04-22 02:42:43 +03:00
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ret = mtd_read(mtd, page * record_size, sizeof(hdr),
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&retlen, (u_char *)&hdr);
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if (retlen != sizeof(hdr) ||
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2011-09-21 05:34:25 +04:00
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(ret < 0 && !mtd_is_bitflip(ret))) {
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2022-04-22 02:42:43 +03:00
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printk(KERN_ERR "mtdoops: read failure at %ld (%zu of %zu read), err %d\n",
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page * record_size, retlen, sizeof(hdr), ret);
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2008-01-29 14:27:09 +03:00
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continue;
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}
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2022-04-22 02:42:43 +03:00
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if (hdr.seq == 0xffffffff && hdr.magic == 0xffffffff)
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2009-10-29 15:41:11 +03:00
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mark_page_unused(cxt, page);
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2022-04-25 19:09:27 +03:00
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if (hdr.seq == 0xffffffff ||
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(hdr.magic != MTDOOPS_KERNMSG_MAGIC_v1 &&
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hdr.magic != MTDOOPS_KERNMSG_MAGIC_v2))
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2007-05-29 16:31:42 +04:00
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continue;
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if (maxcount == 0xffffffff) {
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2022-04-22 02:42:43 +03:00
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maxcount = hdr.seq;
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2007-05-29 16:31:42 +04:00
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maxpos = page;
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2022-04-22 02:42:43 +03:00
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} else if (hdr.seq < 0x40000000 && maxcount > 0xc0000000) {
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maxcount = hdr.seq;
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2007-05-29 16:31:42 +04:00
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maxpos = page;
|
2022-04-22 02:42:43 +03:00
|
|
|
} else if (hdr.seq > maxcount && hdr.seq < 0xc0000000) {
|
|
|
|
maxcount = hdr.seq;
|
2007-05-29 16:31:42 +04:00
|
|
|
maxpos = page;
|
2022-04-22 02:42:43 +03:00
|
|
|
} else if (hdr.seq > maxcount && hdr.seq > 0xc0000000
|
2009-10-11 14:40:40 +04:00
|
|
|
&& maxcount > 0x80000000) {
|
2022-04-22 02:42:43 +03:00
|
|
|
maxcount = hdr.seq;
|
2007-05-29 16:31:42 +04:00
|
|
|
maxpos = page;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if (maxcount == 0xffffffff) {
|
2012-10-19 19:29:33 +04:00
|
|
|
cxt->nextpage = cxt->oops_pages - 1;
|
|
|
|
cxt->nextcount = 0;
|
|
|
|
}
|
|
|
|
else {
|
|
|
|
cxt->nextpage = maxpos;
|
|
|
|
cxt->nextcount = maxcount;
|
2007-05-29 16:31:42 +04:00
|
|
|
}
|
|
|
|
|
2008-01-29 14:27:11 +03:00
|
|
|
mtdoops_inc_counter(cxt);
|
2007-05-29 16:31:42 +04:00
|
|
|
}
|
|
|
|
|
2009-11-03 16:19:03 +03:00
|
|
|
static void mtdoops_do_dump(struct kmsg_dumper *dumper,
|
2012-06-15 16:07:51 +04:00
|
|
|
enum kmsg_dump_reason reason)
|
2009-11-03 16:19:03 +03:00
|
|
|
{
|
|
|
|
struct mtdoops_context *cxt = container_of(dumper,
|
|
|
|
struct mtdoops_context, dump);
|
2021-03-03 13:15:25 +03:00
|
|
|
struct kmsg_dump_iter iter;
|
2011-01-13 03:59:29 +03:00
|
|
|
|
2009-11-03 16:19:03 +03:00
|
|
|
/* Only dump oopses if dump_oops is set */
|
|
|
|
if (reason == KMSG_DUMP_OOPS && !dump_oops)
|
|
|
|
return;
|
|
|
|
|
2021-03-03 13:15:25 +03:00
|
|
|
kmsg_dump_rewind(&iter);
|
|
|
|
|
2021-03-03 13:15:15 +03:00
|
|
|
if (test_and_set_bit(0, &cxt->oops_buf_busy))
|
|
|
|
return;
|
2022-04-22 02:42:43 +03:00
|
|
|
kmsg_dump_get_buffer(&iter, true,
|
|
|
|
cxt->oops_buf + sizeof(struct mtdoops_hdr),
|
|
|
|
record_size - sizeof(struct mtdoops_hdr), NULL);
|
2021-03-03 13:15:15 +03:00
|
|
|
clear_bit(0, &cxt->oops_buf_busy);
|
2009-11-03 16:19:03 +03:00
|
|
|
|
2020-09-03 06:42:17 +03:00
|
|
|
if (reason != KMSG_DUMP_OOPS) {
|
|
|
|
/* Panics must be written immediately */
|
2011-12-28 19:27:18 +04:00
|
|
|
mtdoops_write(cxt, 1);
|
2020-09-03 06:42:17 +03:00
|
|
|
} else {
|
|
|
|
/* For other cases, schedule work to write it "nicely" */
|
|
|
|
schedule_work(&cxt->work_write);
|
|
|
|
}
|
2009-11-03 16:19:03 +03:00
|
|
|
}
|
2007-05-29 16:31:42 +04:00
|
|
|
|
|
|
|
static void mtdoops_notify_add(struct mtd_info *mtd)
|
|
|
|
{
|
|
|
|
struct mtdoops_context *cxt = &oops_cxt;
|
2009-11-03 16:19:03 +03:00
|
|
|
u64 mtdoops_pages = div_u64(mtd->size, record_size);
|
|
|
|
int err;
|
2007-05-29 16:31:42 +04:00
|
|
|
|
2009-11-03 16:19:03 +03:00
|
|
|
if (!strcmp(mtd->name, mtddev))
|
2009-02-16 19:21:35 +03:00
|
|
|
cxt->mtd_index = mtd->index;
|
|
|
|
|
2009-10-11 14:40:40 +04:00
|
|
|
if (mtd->index != cxt->mtd_index || cxt->mtd_index < 0)
|
2007-05-29 16:31:42 +04:00
|
|
|
return;
|
|
|
|
|
2009-10-11 14:40:40 +04:00
|
|
|
if (mtd->size < mtd->erasesize * 2) {
|
|
|
|
printk(KERN_ERR "mtdoops: MTD partition %d not big enough for mtdoops\n",
|
|
|
|
mtd->index);
|
2007-05-29 16:31:42 +04:00
|
|
|
return;
|
|
|
|
}
|
2009-10-29 15:41:19 +03:00
|
|
|
if (mtd->erasesize < record_size) {
|
2009-10-11 14:40:40 +04:00
|
|
|
printk(KERN_ERR "mtdoops: eraseblock size of MTD partition %d too small\n",
|
|
|
|
mtd->index);
|
2008-01-29 13:25:55 +03:00
|
|
|
return;
|
|
|
|
}
|
2009-11-03 09:08:41 +03:00
|
|
|
if (mtd->size > MTDOOPS_MAX_MTD_SIZE) {
|
|
|
|
printk(KERN_ERR "mtdoops: mtd%d is too large (limit is %d MiB)\n",
|
|
|
|
mtd->index, MTDOOPS_MAX_MTD_SIZE / 1024 / 1024);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
2009-10-29 15:41:11 +03:00
|
|
|
/* oops_page_used is a bit field */
|
treewide: Use array_size() in vmalloc()
The vmalloc() function has no 2-factor argument form, so multiplication
factors need to be wrapped in array_size(). This patch replaces cases of:
vmalloc(a * b)
with:
vmalloc(array_size(a, b))
as well as handling cases of:
vmalloc(a * b * c)
with:
vmalloc(array3_size(a, b, c))
This does, however, attempt to ignore constant size factors like:
vmalloc(4 * 1024)
though any constants defined via macros get caught up in the conversion.
Any factors with a sizeof() of "unsigned char", "char", and "u8" were
dropped, since they're redundant.
The Coccinelle script used for this was:
// Fix redundant parens around sizeof().
@@
type TYPE;
expression THING, E;
@@
(
vmalloc(
- (sizeof(TYPE)) * E
+ sizeof(TYPE) * E
, ...)
|
vmalloc(
- (sizeof(THING)) * E
+ sizeof(THING) * E
, ...)
)
// Drop single-byte sizes and redundant parens.
@@
expression COUNT;
typedef u8;
typedef __u8;
@@
(
vmalloc(
- sizeof(u8) * (COUNT)
+ COUNT
, ...)
|
vmalloc(
- sizeof(__u8) * (COUNT)
+ COUNT
, ...)
|
vmalloc(
- sizeof(char) * (COUNT)
+ COUNT
, ...)
|
vmalloc(
- sizeof(unsigned char) * (COUNT)
+ COUNT
, ...)
|
vmalloc(
- sizeof(u8) * COUNT
+ COUNT
, ...)
|
vmalloc(
- sizeof(__u8) * COUNT
+ COUNT
, ...)
|
vmalloc(
- sizeof(char) * COUNT
+ COUNT
, ...)
|
vmalloc(
- sizeof(unsigned char) * COUNT
+ COUNT
, ...)
)
// 2-factor product with sizeof(type/expression) and identifier or constant.
@@
type TYPE;
expression THING;
identifier COUNT_ID;
constant COUNT_CONST;
@@
(
vmalloc(
- sizeof(TYPE) * (COUNT_ID)
+ array_size(COUNT_ID, sizeof(TYPE))
, ...)
|
vmalloc(
- sizeof(TYPE) * COUNT_ID
+ array_size(COUNT_ID, sizeof(TYPE))
, ...)
|
vmalloc(
- sizeof(TYPE) * (COUNT_CONST)
+ array_size(COUNT_CONST, sizeof(TYPE))
, ...)
|
vmalloc(
- sizeof(TYPE) * COUNT_CONST
+ array_size(COUNT_CONST, sizeof(TYPE))
, ...)
|
vmalloc(
- sizeof(THING) * (COUNT_ID)
+ array_size(COUNT_ID, sizeof(THING))
, ...)
|
vmalloc(
- sizeof(THING) * COUNT_ID
+ array_size(COUNT_ID, sizeof(THING))
, ...)
|
vmalloc(
- sizeof(THING) * (COUNT_CONST)
+ array_size(COUNT_CONST, sizeof(THING))
, ...)
|
vmalloc(
- sizeof(THING) * COUNT_CONST
+ array_size(COUNT_CONST, sizeof(THING))
, ...)
)
// 2-factor product, only identifiers.
@@
identifier SIZE, COUNT;
@@
vmalloc(
- SIZE * COUNT
+ array_size(COUNT, SIZE)
, ...)
// 3-factor product with 1 sizeof(type) or sizeof(expression), with
// redundant parens removed.
@@
expression THING;
identifier STRIDE, COUNT;
type TYPE;
@@
(
vmalloc(
- sizeof(TYPE) * (COUNT) * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
|
vmalloc(
- sizeof(TYPE) * (COUNT) * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
|
vmalloc(
- sizeof(TYPE) * COUNT * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
|
vmalloc(
- sizeof(TYPE) * COUNT * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
|
vmalloc(
- sizeof(THING) * (COUNT) * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
|
vmalloc(
- sizeof(THING) * (COUNT) * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
|
vmalloc(
- sizeof(THING) * COUNT * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
|
vmalloc(
- sizeof(THING) * COUNT * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
)
// 3-factor product with 2 sizeof(variable), with redundant parens removed.
@@
expression THING1, THING2;
identifier COUNT;
type TYPE1, TYPE2;
@@
(
vmalloc(
- sizeof(TYPE1) * sizeof(TYPE2) * COUNT
+ array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
, ...)
|
vmalloc(
- sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+ array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
, ...)
|
vmalloc(
- sizeof(THING1) * sizeof(THING2) * COUNT
+ array3_size(COUNT, sizeof(THING1), sizeof(THING2))
, ...)
|
vmalloc(
- sizeof(THING1) * sizeof(THING2) * (COUNT)
+ array3_size(COUNT, sizeof(THING1), sizeof(THING2))
, ...)
|
vmalloc(
- sizeof(TYPE1) * sizeof(THING2) * COUNT
+ array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
, ...)
|
vmalloc(
- sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+ array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
, ...)
)
// 3-factor product, only identifiers, with redundant parens removed.
@@
identifier STRIDE, SIZE, COUNT;
@@
(
vmalloc(
- (COUNT) * STRIDE * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
vmalloc(
- COUNT * (STRIDE) * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
vmalloc(
- COUNT * STRIDE * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
vmalloc(
- (COUNT) * (STRIDE) * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
vmalloc(
- COUNT * (STRIDE) * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
vmalloc(
- (COUNT) * STRIDE * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
vmalloc(
- (COUNT) * (STRIDE) * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
vmalloc(
- COUNT * STRIDE * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
)
// Any remaining multi-factor products, first at least 3-factor products
// when they're not all constants...
@@
expression E1, E2, E3;
constant C1, C2, C3;
@@
(
vmalloc(C1 * C2 * C3, ...)
|
vmalloc(
- E1 * E2 * E3
+ array3_size(E1, E2, E3)
, ...)
)
// And then all remaining 2 factors products when they're not all constants.
@@
expression E1, E2;
constant C1, C2;
@@
(
vmalloc(C1 * C2, ...)
|
vmalloc(
- E1 * E2
+ array_size(E1, E2)
, ...)
)
Signed-off-by: Kees Cook <keescook@chromium.org>
2018-06-13 00:27:11 +03:00
|
|
|
cxt->oops_page_used =
|
|
|
|
vmalloc(array_size(sizeof(unsigned long),
|
|
|
|
DIV_ROUND_UP(mtdoops_pages,
|
|
|
|
BITS_PER_LONG)));
|
2009-10-29 15:41:11 +03:00
|
|
|
if (!cxt->oops_page_used) {
|
2009-11-03 16:19:03 +03:00
|
|
|
printk(KERN_ERR "mtdoops: could not allocate page array\n");
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
2012-06-15 16:07:51 +04:00
|
|
|
cxt->dump.max_reason = KMSG_DUMP_OOPS;
|
2009-11-03 16:19:03 +03:00
|
|
|
cxt->dump.dump = mtdoops_do_dump;
|
|
|
|
err = kmsg_dump_register(&cxt->dump);
|
|
|
|
if (err) {
|
|
|
|
printk(KERN_ERR "mtdoops: registering kmsg dumper failed, error %d\n", err);
|
|
|
|
vfree(cxt->oops_page_used);
|
|
|
|
cxt->oops_page_used = NULL;
|
2009-10-29 15:41:11 +03:00
|
|
|
return;
|
|
|
|
}
|
2007-05-29 16:31:42 +04:00
|
|
|
|
2009-11-03 09:08:41 +03:00
|
|
|
cxt->mtd = mtd;
|
2009-10-29 15:41:19 +03:00
|
|
|
cxt->oops_pages = (int)mtd->size / record_size;
|
2008-01-29 14:27:11 +03:00
|
|
|
find_next_position(cxt);
|
2008-01-29 13:25:55 +03:00
|
|
|
printk(KERN_INFO "mtdoops: Attached to MTD device %d\n", mtd->index);
|
2007-05-29 16:31:42 +04:00
|
|
|
}
|
|
|
|
|
|
|
|
static void mtdoops_notify_remove(struct mtd_info *mtd)
|
|
|
|
{
|
|
|
|
struct mtdoops_context *cxt = &oops_cxt;
|
|
|
|
|
2009-10-11 14:40:40 +04:00
|
|
|
if (mtd->index != cxt->mtd_index || cxt->mtd_index < 0)
|
2007-05-29 16:31:42 +04:00
|
|
|
return;
|
|
|
|
|
2009-11-03 16:19:03 +03:00
|
|
|
if (kmsg_dump_unregister(&cxt->dump) < 0)
|
|
|
|
printk(KERN_WARNING "mtdoops: could not unregister kmsg_dumper\n");
|
|
|
|
|
2007-05-29 16:31:42 +04:00
|
|
|
cxt->mtd = NULL;
|
2012-08-21 01:51:24 +04:00
|
|
|
flush_work(&cxt->work_erase);
|
|
|
|
flush_work(&cxt->work_write);
|
2007-05-29 16:31:42 +04:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static struct mtd_notifier mtdoops_notifier = {
|
|
|
|
.add = mtdoops_notify_add,
|
|
|
|
.remove = mtdoops_notify_remove,
|
|
|
|
};
|
|
|
|
|
2009-11-03 16:19:03 +03:00
|
|
|
static int __init mtdoops_init(void)
|
2007-05-29 16:31:42 +04:00
|
|
|
{
|
|
|
|
struct mtdoops_context *cxt = &oops_cxt;
|
2009-11-03 16:19:03 +03:00
|
|
|
int mtd_index;
|
|
|
|
char *endp;
|
2007-05-29 16:31:42 +04:00
|
|
|
|
2009-11-03 16:19:03 +03:00
|
|
|
if (strlen(mtddev) == 0) {
|
|
|
|
printk(KERN_ERR "mtdoops: mtd device (mtddev=name/number) must be supplied\n");
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
2009-10-29 15:41:19 +03:00
|
|
|
if ((record_size & 4095) != 0) {
|
|
|
|
printk(KERN_ERR "mtdoops: record_size must be a multiple of 4096\n");
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
if (record_size < 4096) {
|
|
|
|
printk(KERN_ERR "mtdoops: record_size must be over 4096 bytes\n");
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
2009-11-03 16:19:03 +03:00
|
|
|
|
|
|
|
/* Setup the MTD device to use */
|
2007-05-29 16:31:42 +04:00
|
|
|
cxt->mtd_index = -1;
|
2009-11-03 16:19:03 +03:00
|
|
|
mtd_index = simple_strtoul(mtddev, &endp, 0);
|
|
|
|
if (*endp == '\0')
|
|
|
|
cxt->mtd_index = mtd_index;
|
|
|
|
|
2009-10-29 15:41:19 +03:00
|
|
|
cxt->oops_buf = vmalloc(record_size);
|
2021-06-10 05:12:01 +03:00
|
|
|
if (!cxt->oops_buf)
|
2007-05-29 16:31:42 +04:00
|
|
|
return -ENOMEM;
|
2009-11-03 16:19:03 +03:00
|
|
|
memset(cxt->oops_buf, 0xff, record_size);
|
2021-03-03 13:15:15 +03:00
|
|
|
cxt->oops_buf_busy = 0;
|
2007-05-29 16:31:42 +04:00
|
|
|
|
2008-01-29 14:27:11 +03:00
|
|
|
INIT_WORK(&cxt->work_erase, mtdoops_workfunc_erase);
|
|
|
|
INIT_WORK(&cxt->work_write, mtdoops_workfunc_write);
|
2007-05-29 16:31:42 +04:00
|
|
|
|
|
|
|
register_mtd_user(&mtdoops_notifier);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2009-11-03 16:19:03 +03:00
|
|
|
static void __exit mtdoops_exit(void)
|
2007-05-29 16:31:42 +04:00
|
|
|
{
|
|
|
|
struct mtdoops_context *cxt = &oops_cxt;
|
|
|
|
|
|
|
|
unregister_mtd_user(&mtdoops_notifier);
|
|
|
|
vfree(cxt->oops_buf);
|
2009-10-29 15:41:11 +03:00
|
|
|
vfree(cxt->oops_page_used);
|
2007-05-29 16:31:42 +04:00
|
|
|
}
|
|
|
|
|
|
|
|
|
2009-11-03 16:19:03 +03:00
|
|
|
module_init(mtdoops_init);
|
|
|
|
module_exit(mtdoops_exit);
|
2007-05-29 16:31:42 +04:00
|
|
|
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
MODULE_AUTHOR("Richard Purdie <rpurdie@openedhand.com>");
|
|
|
|
MODULE_DESCRIPTION("MTD Oops/Panic console logger/driver");
|