static int mtd_ipanic_block_read(struct mtd_ipanic_data *ctx, off_t file_offset, int file_length, void *buf)
{
#if 0
xlog_printk(ANDROID_LOG_INFO, IPANIC_LOG_TAG, "%s: ctx:%p file_offset:%d file_length:%lu\n", __func__, ctx, file_offset, file_length);
#endif
while (file_length > 0) {
unsigned int page_no;
off_t page_offset;
int rc;
size_t count = file_length;
/* We only support reading a maximum of a flash page */
if (count > ctx->mtd->writesize)
count = ctx->mtd->writesize;
page_no = file_offset / ctx->mtd->writesize;
page_offset = file_offset % ctx->mtd->writesize;
rc = mtd_ipanic_block_read_single(ctx, page_no * ctx->mtd->writesize);
if (rc < 0) {
xlog_printk(ANDROID_LOG_ERROR, IPANIC_LOG_TAG, "aee-ipanic(%s): mtd read error page_no(%d) error(%d)\n", __func__, page_no, rc);
goto error_return;
}
if (page_offset)
count -= page_offset;
memcpy(buf, ctx->bounce + page_offset, count);
file_length -= count;
buf += count;
file_offset += count;
}
return 0;
error_return:
return -1;
}
static void mtd_panic_notify_add(struct mtd_info *mtd)
{
struct mtd_ipanic_data *ctx = &mtd_drv_ctx;
struct ipanic_header *hdr;
int rc;
if (strcmp(mtd->name, AEE_IPANIC_PLABEL))
return;
ctx->mtd = mtd;
ctx->bounce = kzalloc(ctx->mtd->writesize, GFP_KERNEL);
if (ctx->bounce == NULL)
xlog_printk(ANDROID_LOG_ERROR, IPANIC_LOG_TAG, "%s: mtd buffer kzalloc failed, %d \n", __func__, ctx->mtd->writesize);
hdr = ctx->bounce;
if (!mtd_ipanic_block_scan(ctx))
goto out_err;
rc = mtd_ipanic_block_read_single(ctx, 0);
if (rc < 0) {
xlog_printk(ANDROID_LOG_ERROR, IPANIC_LOG_TAG, "aee-ipanic: Error reading block 0 (%d)\n", rc);
mtd_ipanic_block_erase();
goto out_err;
}
xlog_printk(ANDROID_LOG_INFO, IPANIC_LOG_TAG, "aee-ipanic: Bound to mtd partition '%s', write size(%d), write size shift(%d)\n", mtd->name, mtd->writesize, mtd->writesize_shift);
switch (ipanic_header_check(hdr)) {
case 0:
break;
case 1:
return;
case 2:
mtd_ipanic_block_erase();
return;
}
memcpy(&ctx->curr, hdr, sizeof(struct ipanic_header));
ipanic_header_dump(hdr);
ctx->oops = create_proc_read_entry("aee_ipanic_oops",
0444, NULL,
mtd_ipanic_proc_oops,
NULL);
if (ctx->oops == NULL) {
xlog_printk(ANDROID_LOG_ERROR, IPANIC_LOG_TAG, " %s: failed to create proc file apanic_oops\n", __func__);
}
/*it will free the ctx->curr assigne during bootup. then
open the ke device will return NULL. so lose db
*/
//mtd_ipanic_oops_dump();
return;
out_err:
ctx->mtd = NULL;
}