440 lines
11 KiB
C
440 lines
11 KiB
C
/*
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* MTD Oops/Panic logger
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*
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* Copyright (C) 2007 Nokia Corporation. All rights reserved.
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*
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* Author: Richard Purdie <rpurdie@openedhand.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*
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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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#include <linux/delay.h>
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#include <linux/spinlock.h>
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#include <linux/interrupt.h>
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#include <linux/mtd/mtd.h>
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#define OOPS_PAGE_SIZE 4096
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struct mtdoops_context {
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int mtd_index;
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struct work_struct work_erase;
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struct work_struct work_write;
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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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void *oops_buf;
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/* writecount and disabling ready are spin lock protected */
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spinlock_t writecount_lock;
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int ready;
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int writecount;
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} oops_cxt;
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static void mtdoops_erase_callback(struct erase_info *done)
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{
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wait_queue_head_t *wait_q = (wait_queue_head_t *)done->priv;
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wake_up(wait_q);
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}
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static int mtdoops_erase_block(struct mtd_info *mtd, int offset)
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{
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struct erase_info erase;
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DECLARE_WAITQUEUE(wait, current);
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wait_queue_head_t wait_q;
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int ret;
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init_waitqueue_head(&wait_q);
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erase.mtd = mtd;
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erase.callback = mtdoops_erase_callback;
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erase.addr = offset;
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erase.len = mtd->erasesize;
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erase.priv = (u_long)&wait_q;
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set_current_state(TASK_INTERRUPTIBLE);
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add_wait_queue(&wait_q, &wait);
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ret = mtd->erase(mtd, &erase);
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if (ret) {
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set_current_state(TASK_RUNNING);
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remove_wait_queue(&wait_q, &wait);
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printk (KERN_WARNING "mtdoops: erase of region [0x%x, 0x%x] "
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"on \"%s\" failed\n",
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erase.addr, erase.len, mtd->name);
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return ret;
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}
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schedule(); /* Wait for erase to finish. */
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remove_wait_queue(&wait_q, &wait);
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return 0;
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}
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static void mtdoops_inc_counter(struct mtdoops_context *cxt)
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{
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struct mtd_info *mtd = cxt->mtd;
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size_t retlen;
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u32 count;
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int ret;
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cxt->nextpage++;
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if (cxt->nextpage > cxt->oops_pages)
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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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ret = mtd->read(mtd, cxt->nextpage * OOPS_PAGE_SIZE, 4,
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&retlen, (u_char *) &count);
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if ((retlen != 4) || ((ret < 0) && (ret != -EUCLEAN))) {
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printk(KERN_ERR "mtdoops: Read failure at %d (%td of 4 read)"
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", err %d.\n", cxt->nextpage * OOPS_PAGE_SIZE,
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retlen, ret);
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schedule_work(&cxt->work_erase);
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return;
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}
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/* See if we need to erase the next block */
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if (count != 0xffffffff) {
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schedule_work(&cxt->work_erase);
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return;
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}
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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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cxt->ready = 1;
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}
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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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{
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struct mtdoops_context *cxt =
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container_of(work, struct mtdoops_context, work_erase);
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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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mod = (cxt->nextpage * OOPS_PAGE_SIZE) % mtd->erasesize;
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if (mod != 0) {
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cxt->nextpage = cxt->nextpage + ((mtd->erasesize - mod) / OOPS_PAGE_SIZE);
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if (cxt->nextpage > cxt->oops_pages)
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cxt->nextpage = 0;
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}
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while (mtd->block_isbad) {
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ret = mtd->block_isbad(mtd, cxt->nextpage * OOPS_PAGE_SIZE);
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if (!ret)
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break;
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if (ret < 0) {
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printk(KERN_ERR "mtdoops: block_isbad failed, aborting.\n");
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return;
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}
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badblock:
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printk(KERN_WARNING "mtdoops: Bad block at %08x\n",
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cxt->nextpage * OOPS_PAGE_SIZE);
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i++;
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cxt->nextpage = cxt->nextpage + (mtd->erasesize / OOPS_PAGE_SIZE);
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if (cxt->nextpage > cxt->oops_pages)
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cxt->nextpage = 0;
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if (i == (cxt->oops_pages / (mtd->erasesize / OOPS_PAGE_SIZE))) {
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printk(KERN_ERR "mtdoops: All blocks bad!\n");
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return;
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}
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}
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for (j = 0, ret = -1; (j < 3) && (ret < 0); j++)
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ret = mtdoops_erase_block(mtd, cxt->nextpage * OOPS_PAGE_SIZE);
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if (ret >= 0) {
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printk(KERN_DEBUG "mtdoops: Ready %d, %d \n", cxt->nextpage, cxt->nextcount);
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cxt->ready = 1;
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return;
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}
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if (mtd->block_markbad && (ret == -EIO)) {
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ret = mtd->block_markbad(mtd, cxt->nextpage * OOPS_PAGE_SIZE);
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if (ret < 0) {
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printk(KERN_ERR "mtdoops: block_markbad failed, aborting.\n");
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return;
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}
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}
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goto badblock;
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}
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static void mtdoops_write(struct mtdoops_context *cxt, int panic)
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{
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struct mtd_info *mtd = cxt->mtd;
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size_t retlen;
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int ret;
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if (cxt->writecount < OOPS_PAGE_SIZE)
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memset(cxt->oops_buf + cxt->writecount, 0xff,
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OOPS_PAGE_SIZE - cxt->writecount);
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if (panic)
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ret = mtd->panic_write(mtd, cxt->nextpage * OOPS_PAGE_SIZE,
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OOPS_PAGE_SIZE, &retlen, cxt->oops_buf);
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else
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ret = mtd->write(mtd, cxt->nextpage * OOPS_PAGE_SIZE,
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OOPS_PAGE_SIZE, &retlen, cxt->oops_buf);
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cxt->writecount = 0;
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if ((retlen != OOPS_PAGE_SIZE) || (ret < 0))
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printk(KERN_ERR "mtdoops: Write failure at %d (%td of %d written), err %d.\n",
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cxt->nextpage * OOPS_PAGE_SIZE, retlen, OOPS_PAGE_SIZE, ret);
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mtdoops_inc_counter(cxt);
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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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}
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static void find_next_position(struct mtdoops_context *cxt)
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{
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struct mtd_info *mtd = cxt->mtd;
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int ret, page, maxpos = 0;
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u32 count, maxcount = 0xffffffff;
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size_t retlen;
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for (page = 0; page < cxt->oops_pages; page++) {
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ret = mtd->read(mtd, page * OOPS_PAGE_SIZE, 4, &retlen, (u_char *) &count);
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if ((retlen != 4) || ((ret < 0) && (ret != -EUCLEAN))) {
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printk(KERN_ERR "mtdoops: Read failure at %d (%td of 4 read)"
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", err %d.\n", page * OOPS_PAGE_SIZE, retlen, ret);
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continue;
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}
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if (count == 0xffffffff)
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continue;
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if (maxcount == 0xffffffff) {
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maxcount = count;
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maxpos = page;
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} else if ((count < 0x40000000) && (maxcount > 0xc0000000)) {
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maxcount = count;
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maxpos = page;
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} else if ((count > maxcount) && (count < 0xc0000000)) {
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maxcount = count;
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maxpos = page;
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} else if ((count > maxcount) && (count > 0xc0000000)
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&& (maxcount > 0x80000000)) {
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maxcount = count;
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maxpos = page;
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}
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}
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if (maxcount == 0xffffffff) {
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cxt->nextpage = 0;
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cxt->nextcount = 1;
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cxt->ready = 1;
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printk(KERN_DEBUG "mtdoops: Ready %d, %d (first init)\n",
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cxt->nextpage, cxt->nextcount);
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return;
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}
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cxt->nextpage = maxpos;
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cxt->nextcount = maxcount;
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mtdoops_inc_counter(cxt);
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}
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static void mtdoops_notify_add(struct mtd_info *mtd)
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{
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struct mtdoops_context *cxt = &oops_cxt;
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if ((mtd->index != cxt->mtd_index) || cxt->mtd_index < 0)
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return;
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if (mtd->size < (mtd->erasesize * 2)) {
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printk(KERN_ERR "MTD partition %d not big enough for mtdoops\n",
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mtd->index);
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return;
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}
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if (mtd->erasesize < OOPS_PAGE_SIZE) {
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printk(KERN_ERR "Eraseblock size of MTD partition %d too small\n",
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mtd->index);
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return;
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}
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cxt->mtd = mtd;
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cxt->oops_pages = mtd->size / OOPS_PAGE_SIZE;
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find_next_position(cxt);
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printk(KERN_INFO "mtdoops: Attached to MTD device %d\n", mtd->index);
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}
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static void mtdoops_notify_remove(struct mtd_info *mtd)
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{
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struct mtdoops_context *cxt = &oops_cxt;
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if ((mtd->index != cxt->mtd_index) || cxt->mtd_index < 0)
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return;
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cxt->mtd = NULL;
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flush_scheduled_work();
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}
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static void mtdoops_console_sync(void)
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{
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struct mtdoops_context *cxt = &oops_cxt;
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struct mtd_info *mtd = cxt->mtd;
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unsigned long flags;
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if (!cxt->ready || !mtd || cxt->writecount == 0)
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return;
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/*
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* Once ready is 0 and we've held the lock no further writes to the
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* buffer will happen
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*/
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spin_lock_irqsave(&cxt->writecount_lock, flags);
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if (!cxt->ready) {
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spin_unlock_irqrestore(&cxt->writecount_lock, flags);
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return;
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}
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cxt->ready = 0;
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spin_unlock_irqrestore(&cxt->writecount_lock, flags);
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if (mtd->panic_write && in_interrupt())
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/* Interrupt context, we're going to panic so try and log */
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mtdoops_write(cxt, 1);
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else
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schedule_work(&cxt->work_write);
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}
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static void
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mtdoops_console_write(struct console *co, const char *s, unsigned int count)
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{
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struct mtdoops_context *cxt = co->data;
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struct mtd_info *mtd = cxt->mtd;
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unsigned long flags;
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if (!oops_in_progress) {
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mtdoops_console_sync();
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return;
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}
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if (!cxt->ready || !mtd)
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return;
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/* Locking on writecount ensures sequential writes to the buffer */
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spin_lock_irqsave(&cxt->writecount_lock, flags);
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/* Check ready status didn't change whilst waiting for the lock */
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if (!cxt->ready)
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return;
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if (cxt->writecount == 0) {
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u32 *stamp = cxt->oops_buf;
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*stamp = cxt->nextcount;
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cxt->writecount = 4;
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}
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if ((count + cxt->writecount) > OOPS_PAGE_SIZE)
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count = OOPS_PAGE_SIZE - cxt->writecount;
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memcpy(cxt->oops_buf + cxt->writecount, s, count);
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cxt->writecount += count;
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spin_unlock_irqrestore(&cxt->writecount_lock, flags);
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if (cxt->writecount == OOPS_PAGE_SIZE)
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mtdoops_console_sync();
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}
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static int __init mtdoops_console_setup(struct console *co, char *options)
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{
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struct mtdoops_context *cxt = co->data;
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if (cxt->mtd_index != -1)
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return -EBUSY;
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if (co->index == -1)
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return -EINVAL;
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cxt->mtd_index = co->index;
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return 0;
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}
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static struct mtd_notifier mtdoops_notifier = {
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.add = mtdoops_notify_add,
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.remove = mtdoops_notify_remove,
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};
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static struct console mtdoops_console = {
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.name = "ttyMTD",
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.write = mtdoops_console_write,
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.setup = mtdoops_console_setup,
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.unblank = mtdoops_console_sync,
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.index = -1,
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.data = &oops_cxt,
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};
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static int __init mtdoops_console_init(void)
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{
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struct mtdoops_context *cxt = &oops_cxt;
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cxt->mtd_index = -1;
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cxt->oops_buf = vmalloc(OOPS_PAGE_SIZE);
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if (!cxt->oops_buf) {
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printk(KERN_ERR "Failed to allocate mtdoops buffer workspace\n");
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return -ENOMEM;
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}
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INIT_WORK(&cxt->work_erase, mtdoops_workfunc_erase);
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INIT_WORK(&cxt->work_write, mtdoops_workfunc_write);
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register_console(&mtdoops_console);
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register_mtd_user(&mtdoops_notifier);
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return 0;
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}
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static void __exit mtdoops_console_exit(void)
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{
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struct mtdoops_context *cxt = &oops_cxt;
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unregister_mtd_user(&mtdoops_notifier);
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unregister_console(&mtdoops_console);
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vfree(cxt->oops_buf);
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}
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subsys_initcall(mtdoops_console_init);
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module_exit(mtdoops_console_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Richard Purdie <rpurdie@openedhand.com>");
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MODULE_DESCRIPTION("MTD Oops/Panic console logger/driver");
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