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Diffstat (limited to 'ANDROID_3.4.5/drivers/mtd/mtdoops.c')
-rw-r--r--ANDROID_3.4.5/drivers/mtd/mtdoops.c468
1 files changed, 0 insertions, 468 deletions
diff --git a/ANDROID_3.4.5/drivers/mtd/mtdoops.c b/ANDROID_3.4.5/drivers/mtd/mtdoops.c
deleted file mode 100644
index ae36d7e1..00000000
--- a/ANDROID_3.4.5/drivers/mtd/mtdoops.c
+++ /dev/null
@@ -1,468 +0,0 @@
-/*
- * MTD Oops/Panic logger
- *
- * Copyright © 2007 Nokia Corporation. All rights reserved.
- *
- * Author: Richard Purdie <rpurdie@openedhand.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * version 2 as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
- * 02110-1301 USA
- *
- */
-
-#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/mtd/mtd.h>
-#include <linux/kmsg_dump.h>
-
-/* Maximum MTD partition size */
-#define MTDOOPS_MAX_MTD_SIZE (8 * 1024 * 1024)
-
-#define MTDOOPS_KERNMSG_MAGIC 0x5d005d00
-#define MTDOOPS_HEADER_SIZE 8
-
-static unsigned long record_size = 4096;
-module_param(record_size, ulong, 0400);
-MODULE_PARM_DESC(record_size,
- "record size for MTD OOPS pages in bytes (default 4096)");
-
-static char mtddev[80];
-module_param_string(mtddev, mtddev, 80, 0400);
-MODULE_PARM_DESC(mtddev,
- "name or index number of the MTD device to use");
-
-static int dump_oops = 1;
-module_param(dump_oops, int, 0600);
-MODULE_PARM_DESC(dump_oops,
- "set to 1 to dump oopses, 0 to only dump panics (default 1)");
-
-static struct mtdoops_context {
- struct kmsg_dumper dump;
-
- int mtd_index;
- struct work_struct work_erase;
- struct work_struct work_write;
- struct mtd_info *mtd;
- int oops_pages;
- int nextpage;
- int nextcount;
- unsigned long *oops_page_used;
-
- void *oops_buf;
-} oops_cxt;
-
-static void mark_page_used(struct mtdoops_context *cxt, int page)
-{
- set_bit(page, cxt->oops_page_used);
-}
-
-static void mark_page_unused(struct mtdoops_context *cxt, int page)
-{
- clear_bit(page, cxt->oops_page_used);
-}
-
-static int page_is_used(struct mtdoops_context *cxt, int page)
-{
- return test_bit(page, cxt->oops_page_used);
-}
-
-static void mtdoops_erase_callback(struct erase_info *done)
-{
- wait_queue_head_t *wait_q = (wait_queue_head_t *)done->priv;
- wake_up(wait_q);
-}
-
-static int mtdoops_erase_block(struct mtdoops_context *cxt, int offset)
-{
- struct mtd_info *mtd = cxt->mtd;
- u32 start_page_offset = mtd_div_by_eb(offset, mtd) * mtd->erasesize;
- u32 start_page = start_page_offset / record_size;
- u32 erase_pages = mtd->erasesize / record_size;
- struct erase_info erase;
- DECLARE_WAITQUEUE(wait, current);
- wait_queue_head_t wait_q;
- int ret;
- int page;
-
- init_waitqueue_head(&wait_q);
- erase.mtd = mtd;
- erase.callback = mtdoops_erase_callback;
- erase.addr = offset;
- erase.len = mtd->erasesize;
- erase.priv = (u_long)&wait_q;
-
- set_current_state(TASK_INTERRUPTIBLE);
- add_wait_queue(&wait_q, &wait);
-
- ret = mtd_erase(mtd, &erase);
- if (ret) {
- set_current_state(TASK_RUNNING);
- remove_wait_queue(&wait_q, &wait);
- printk(KERN_WARNING "mtdoops: erase of region [0x%llx, 0x%llx] on \"%s\" failed\n",
- (unsigned long long)erase.addr,
- (unsigned long long)erase.len, mtddev);
- return ret;
- }
-
- schedule(); /* Wait for erase to finish. */
- remove_wait_queue(&wait_q, &wait);
-
- /* Mark pages as unused */
- for (page = start_page; page < start_page + erase_pages; page++)
- mark_page_unused(cxt, page);
-
- return 0;
-}
-
-static void mtdoops_inc_counter(struct mtdoops_context *cxt)
-{
- cxt->nextpage++;
- if (cxt->nextpage >= cxt->oops_pages)
- cxt->nextpage = 0;
- cxt->nextcount++;
- if (cxt->nextcount == 0xffffffff)
- cxt->nextcount = 0;
-
- if (page_is_used(cxt, cxt->nextpage)) {
- schedule_work(&cxt->work_erase);
- return;
- }
-
- printk(KERN_DEBUG "mtdoops: ready %d, %d (no erase)\n",
- cxt->nextpage, cxt->nextcount);
-}
-
-/* Scheduled work - when we can't proceed without erasing a block */
-static void mtdoops_workfunc_erase(struct work_struct *work)
-{
- struct mtdoops_context *cxt =
- container_of(work, struct mtdoops_context, work_erase);
- struct mtd_info *mtd = cxt->mtd;
- int i = 0, j, ret, mod;
-
- /* We were unregistered */
- if (!mtd)
- return;
-
- mod = (cxt->nextpage * record_size) % mtd->erasesize;
- if (mod != 0) {
- cxt->nextpage = cxt->nextpage + ((mtd->erasesize - mod) / record_size);
- if (cxt->nextpage >= cxt->oops_pages)
- cxt->nextpage = 0;
- }
-
- while (1) {
- ret = mtd_block_isbad(mtd, cxt->nextpage * record_size);
- if (!ret)
- break;
- if (ret < 0) {
- printk(KERN_ERR "mtdoops: block_isbad failed, aborting\n");
- return;
- }
-badblock:
- printk(KERN_WARNING "mtdoops: bad block at %08lx\n",
- cxt->nextpage * record_size);
- i++;
- cxt->nextpage = cxt->nextpage + (mtd->erasesize / record_size);
- if (cxt->nextpage >= cxt->oops_pages)
- cxt->nextpage = 0;
- if (i == cxt->oops_pages / (mtd->erasesize / record_size)) {
- printk(KERN_ERR "mtdoops: all blocks bad!\n");
- return;
- }
- }
-
- for (j = 0, ret = -1; (j < 3) && (ret < 0); j++)
- ret = mtdoops_erase_block(cxt, cxt->nextpage * record_size);
-
- if (ret >= 0) {
- printk(KERN_DEBUG "mtdoops: ready %d, %d\n",
- cxt->nextpage, cxt->nextcount);
- return;
- }
-
- if (ret == -EIO) {
- ret = mtd_block_markbad(mtd, cxt->nextpage * record_size);
- if (ret < 0 && ret != -EOPNOTSUPP) {
- printk(KERN_ERR "mtdoops: block_markbad failed, aborting\n");
- return;
- }
- }
- goto badblock;
-}
-
-static void mtdoops_write(struct mtdoops_context *cxt, int panic)
-{
- struct mtd_info *mtd = cxt->mtd;
- size_t retlen;
- u32 *hdr;
- int ret;
-
- /* Add mtdoops header to the buffer */
- hdr = cxt->oops_buf;
- hdr[0] = cxt->nextcount;
- hdr[1] = MTDOOPS_KERNMSG_MAGIC;
-
- if (panic) {
- ret = mtd_panic_write(mtd, cxt->nextpage * record_size,
- record_size, &retlen, cxt->oops_buf);
- if (ret == -EOPNOTSUPP) {
- printk(KERN_ERR "mtdoops: Cannot write from panic without panic_write\n");
- return;
- }
- } else
- ret = mtd_write(mtd, cxt->nextpage * record_size,
- record_size, &retlen, cxt->oops_buf);
-
- if (retlen != record_size || ret < 0)
- printk(KERN_ERR "mtdoops: write failure at %ld (%td of %ld written), error %d\n",
- cxt->nextpage * record_size, retlen, record_size, ret);
- mark_page_used(cxt, cxt->nextpage);
- memset(cxt->oops_buf, 0xff, record_size);
-
- mtdoops_inc_counter(cxt);
-}
-
-static void mtdoops_workfunc_write(struct work_struct *work)
-{
- struct mtdoops_context *cxt =
- container_of(work, struct mtdoops_context, work_write);
-
- mtdoops_write(cxt, 0);
-}
-
-static void find_next_position(struct mtdoops_context *cxt)
-{
- struct mtd_info *mtd = cxt->mtd;
- int ret, page, maxpos = 0;
- u32 count[2], maxcount = 0xffffffff;
- size_t retlen;
-
- for (page = 0; page < cxt->oops_pages; page++) {
- if (mtd_block_isbad(mtd, page * record_size))
- continue;
- /* Assume the page is used */
- mark_page_used(cxt, page);
- ret = mtd_read(mtd, page * record_size, MTDOOPS_HEADER_SIZE,
- &retlen, (u_char *)&count[0]);
- if (retlen != MTDOOPS_HEADER_SIZE ||
- (ret < 0 && !mtd_is_bitflip(ret))) {
- printk(KERN_ERR "mtdoops: read failure at %ld (%td of %d read), err %d\n",
- page * record_size, retlen,
- MTDOOPS_HEADER_SIZE, ret);
- continue;
- }
-
- if (count[0] == 0xffffffff && count[1] == 0xffffffff)
- mark_page_unused(cxt, page);
- if (count[0] == 0xffffffff)
- continue;
- if (maxcount == 0xffffffff) {
- maxcount = count[0];
- maxpos = page;
- } else if (count[0] < 0x40000000 && maxcount > 0xc0000000) {
- maxcount = count[0];
- maxpos = page;
- } else if (count[0] > maxcount && count[0] < 0xc0000000) {
- maxcount = count[0];
- maxpos = page;
- } else if (count[0] > maxcount && count[0] > 0xc0000000
- && maxcount > 0x80000000) {
- maxcount = count[0];
- maxpos = page;
- }
- }
- if (maxcount == 0xffffffff) {
- cxt->nextpage = 0;
- cxt->nextcount = 1;
- schedule_work(&cxt->work_erase);
- return;
- }
-
- cxt->nextpage = maxpos;
- cxt->nextcount = maxcount;
-
- mtdoops_inc_counter(cxt);
-}
-
-static void mtdoops_do_dump(struct kmsg_dumper *dumper,
- enum kmsg_dump_reason reason, const char *s1, unsigned long l1,
- const char *s2, unsigned long l2)
-{
- struct mtdoops_context *cxt = container_of(dumper,
- struct mtdoops_context, dump);
- unsigned long s1_start, s2_start;
- unsigned long l1_cpy, l2_cpy;
- char *dst;
-
- if (reason != KMSG_DUMP_OOPS &&
- reason != KMSG_DUMP_PANIC)
- return;
-
- /* Only dump oopses if dump_oops is set */
- if (reason == KMSG_DUMP_OOPS && !dump_oops)
- return;
-
- dst = cxt->oops_buf + MTDOOPS_HEADER_SIZE; /* Skip the header */
- l2_cpy = min(l2, record_size - MTDOOPS_HEADER_SIZE);
- l1_cpy = min(l1, record_size - MTDOOPS_HEADER_SIZE - l2_cpy);
-
- s2_start = l2 - l2_cpy;
- s1_start = l1 - l1_cpy;
-
- memcpy(dst, s1 + s1_start, l1_cpy);
- memcpy(dst + l1_cpy, s2 + s2_start, l2_cpy);
-
- /* Panics must be written immediately */
- if (reason != KMSG_DUMP_OOPS)
- mtdoops_write(cxt, 1);
-
- /* For other cases, schedule work to write it "nicely" */
- schedule_work(&cxt->work_write);
-}
-
-static void mtdoops_notify_add(struct mtd_info *mtd)
-{
- struct mtdoops_context *cxt = &oops_cxt;
- u64 mtdoops_pages = div_u64(mtd->size, record_size);
- int err;
-
- if (!strcmp(mtd->name, mtddev))
- cxt->mtd_index = mtd->index;
-
- if (mtd->index != cxt->mtd_index || cxt->mtd_index < 0)
- return;
-
- if (mtd->size < mtd->erasesize * 2) {
- printk(KERN_ERR "mtdoops: MTD partition %d not big enough for mtdoops\n",
- mtd->index);
- return;
- }
- if (mtd->erasesize < record_size) {
- printk(KERN_ERR "mtdoops: eraseblock size of MTD partition %d too small\n",
- mtd->index);
- return;
- }
- 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;
- }
-
- /* oops_page_used is a bit field */
- cxt->oops_page_used = vmalloc(DIV_ROUND_UP(mtdoops_pages,
- BITS_PER_LONG) * sizeof(unsigned long));
- if (!cxt->oops_page_used) {
- printk(KERN_ERR "mtdoops: could not allocate page array\n");
- return;
- }
-
- 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;
- return;
- }
-
- cxt->mtd = mtd;
- cxt->oops_pages = (int)mtd->size / record_size;
- find_next_position(cxt);
- printk(KERN_INFO "mtdoops: Attached to MTD device %d\n", mtd->index);
-}
-
-static void mtdoops_notify_remove(struct mtd_info *mtd)
-{
- struct mtdoops_context *cxt = &oops_cxt;
-
- if (mtd->index != cxt->mtd_index || cxt->mtd_index < 0)
- return;
-
- if (kmsg_dump_unregister(&cxt->dump) < 0)
- printk(KERN_WARNING "mtdoops: could not unregister kmsg_dumper\n");
-
- cxt->mtd = NULL;
- flush_work_sync(&cxt->work_erase);
- flush_work_sync(&cxt->work_write);
-}
-
-
-static struct mtd_notifier mtdoops_notifier = {
- .add = mtdoops_notify_add,
- .remove = mtdoops_notify_remove,
-};
-
-static int __init mtdoops_init(void)
-{
- struct mtdoops_context *cxt = &oops_cxt;
- int mtd_index;
- char *endp;
-
- if (strlen(mtddev) == 0) {
- printk(KERN_ERR "mtdoops: mtd device (mtddev=name/number) must be supplied\n");
- return -EINVAL;
- }
- 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;
- }
-
- /* Setup the MTD device to use */
- cxt->mtd_index = -1;
- mtd_index = simple_strtoul(mtddev, &endp, 0);
- if (*endp == '\0')
- cxt->mtd_index = mtd_index;
-
- cxt->oops_buf = vmalloc(record_size);
- if (!cxt->oops_buf) {
- printk(KERN_ERR "mtdoops: failed to allocate buffer workspace\n");
- return -ENOMEM;
- }
- memset(cxt->oops_buf, 0xff, record_size);
-
- INIT_WORK(&cxt->work_erase, mtdoops_workfunc_erase);
- INIT_WORK(&cxt->work_write, mtdoops_workfunc_write);
-
- register_mtd_user(&mtdoops_notifier);
- return 0;
-}
-
-static void __exit mtdoops_exit(void)
-{
- struct mtdoops_context *cxt = &oops_cxt;
-
- unregister_mtd_user(&mtdoops_notifier);
- vfree(cxt->oops_buf);
- vfree(cxt->oops_page_used);
-}
-
-
-module_init(mtdoops_init);
-module_exit(mtdoops_exit);
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Richard Purdie <rpurdie@openedhand.com>");
-MODULE_DESCRIPTION("MTD Oops/Panic console logger/driver");
generated by cgit (git 2.34.1) at 2025-07-10 03:11:52 +0000