diff options
Diffstat (limited to 'ANDROID_3.4.5/drivers/mtd/mtdoops.c')
-rw-r--r-- | ANDROID_3.4.5/drivers/mtd/mtdoops.c | 468 |
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"); |