From b7a03210b7b381e06f71751cb9addfae7704489c Mon Sep 17 00:00:00 2001 From: Harvey Harrison Date: Wed, 22 Oct 2008 17:09:00 -0700 Subject: mmc: trivial annotation of 'blocks' sg_init_one is reading a be32, annotate as such. Signed-off-by: Harvey Harrison Signed-off-by: Pierre Ossman --- drivers/mmc/card/block.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) (limited to 'drivers/mmc/card/block.c') diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c index 3d067c35185d..903c8aae54bb 100644 --- a/drivers/mmc/card/block.c +++ b/drivers/mmc/card/block.c @@ -145,7 +145,7 @@ struct mmc_blk_request { static u32 mmc_sd_num_wr_blocks(struct mmc_card *card) { int err; - u32 blocks; + __be32 blocks; struct mmc_request mrq; struct mmc_command cmd; @@ -204,9 +204,7 @@ static u32 mmc_sd_num_wr_blocks(struct mmc_card *card) if (cmd.error || data.error) return (u32)-1; - blocks = ntohl(blocks); - - return blocks; + return ntohl(blocks); } static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req) -- cgit v1.2.2 From 504f191f25b1671802246bac06c9f59f94f0b7de Mon Sep 17 00:00:00 2001 From: Adrian Hunter Date: Thu, 16 Oct 2008 12:55:25 +0300 Subject: mmc_block: print better error messages Add command response and card status to error messages. Signed-off-by: Adrian Hunter Signed-off-by: Pierre Ossman --- drivers/mmc/card/block.c | 44 +++++++++++++++++++++++++++++++++++++------- 1 file changed, 37 insertions(+), 7 deletions(-) (limited to 'drivers/mmc/card/block.c') diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c index 903c8aae54bb..cc9b3abf4a3f 100644 --- a/drivers/mmc/card/block.c +++ b/drivers/mmc/card/block.c @@ -207,6 +207,23 @@ static u32 mmc_sd_num_wr_blocks(struct mmc_card *card) return ntohl(blocks); } +static u32 get_card_status(struct mmc_card *card, struct request *req) +{ + struct mmc_command cmd; + int err; + + memset(&cmd, 0, sizeof(struct mmc_command)); + cmd.opcode = MMC_SEND_STATUS; + if (!mmc_host_is_spi(card->host)) + cmd.arg = card->rca << 16; + cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC; + err = mmc_wait_for_cmd(card->host, &cmd, 0); + if (err) + printk(KERN_ERR "%s: error %d sending status comand", + req->rq_disk->disk_name, err); + return cmd.resp[0]; +} + static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req) { struct mmc_blk_data *md = mq->data; @@ -218,7 +235,7 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req) do { struct mmc_command cmd; - u32 readcmd, writecmd; + u32 readcmd, writecmd, status = 0; memset(&brq, 0, sizeof(struct mmc_blk_request)); brq.mrq.cmd = &brq.cmd; @@ -273,19 +290,32 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req) * until later as we need to wait for the card to leave * programming mode even when things go wrong. */ + if (brq.cmd.error || brq.data.error || brq.stop.error) + status = get_card_status(card, req); + if (brq.cmd.error) { - printk(KERN_ERR "%s: error %d sending read/write command\n", - req->rq_disk->disk_name, brq.cmd.error); + printk(KERN_ERR "%s: error %d sending read/write " + "command, response %#x, card status %#x\n", + req->rq_disk->disk_name, brq.cmd.error, + brq.cmd.resp[0], status); } if (brq.data.error) { - printk(KERN_ERR "%s: error %d transferring data\n", - req->rq_disk->disk_name, brq.data.error); + if (brq.data.error == -ETIMEDOUT && brq.mrq.stop) + /* 'Stop' response contains card status */ + status = brq.mrq.stop->resp[0]; + printk(KERN_ERR "%s: error %d transferring data," + " sector %u, nr %u, card status %#x\n", + req->rq_disk->disk_name, brq.data.error, + (unsigned)req->sector, + (unsigned)req->nr_sectors, status); } if (brq.stop.error) { - printk(KERN_ERR "%s: error %d sending stop command\n", - req->rq_disk->disk_name, brq.stop.error); + printk(KERN_ERR "%s: error %d sending stop command, " + "response %#x, card status %#x\n", + req->rq_disk->disk_name, brq.stop.error, + brq.stop.resp[0], status); } if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) { -- cgit v1.2.2 From 6a79e391df295bd7c2aa1309ea5031f361c197fd Mon Sep 17 00:00:00 2001 From: Adrian Hunter Date: Wed, 31 Dec 2008 18:21:17 +0100 Subject: mmc_block: ensure all sectors that do not have errors are read If a card encounters an ECC error while reading a sector it will timeout. Instead of reporting the entire I/O request as having an error, redo the I/O one sector at a time so that all readable sectors are provided to the upper layers. Signed-off-by: Adrian Hunter Signed-off-by: Pierre Ossman --- drivers/mmc/card/block.c | 76 +++++++++++++++++++++++++++++++++++++----------- 1 file changed, 59 insertions(+), 17 deletions(-) (limited to 'drivers/mmc/card/block.c') diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c index cc9b3abf4a3f..45b1f430685f 100644 --- a/drivers/mmc/card/block.c +++ b/drivers/mmc/card/block.c @@ -229,7 +229,7 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req) struct mmc_blk_data *md = mq->data; struct mmc_card *card = md->queue.card; struct mmc_blk_request brq; - int ret = 1; + int ret = 1, disable_multi = 0; mmc_claim_host(card->host); @@ -251,6 +251,14 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req) brq.stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC; brq.data.blocks = req->nr_sectors; + /* + * After a read error, we redo the request one sector at a time + * in order to accurately determine which sectors can be read + * successfully. + */ + if (disable_multi && brq.data.blocks > 1) + brq.data.blocks = 1; + if (brq.data.blocks > 1) { /* SPI multiblock writes terminate using a special * token, not a STOP_TRANSMISSION request. @@ -279,6 +287,25 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req) brq.data.sg = mq->sg; brq.data.sg_len = mmc_queue_map_sg(mq); + /* + * Adjust the sg list so it is the same size as the + * request. + */ + if (brq.data.blocks != req->nr_sectors) { + int i, data_size = brq.data.blocks << 9; + struct scatterlist *sg; + + for_each_sg(brq.data.sg, sg, brq.data.sg_len, i) { + data_size -= sg->length; + if (data_size <= 0) { + sg->length += data_size; + i++; + break; + } + } + brq.data.sg_len = i; + } + mmc_queue_bounce_pre(mq); mmc_wait_for_req(card->host, &brq.mrq); @@ -290,8 +317,16 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req) * until later as we need to wait for the card to leave * programming mode even when things go wrong. */ - if (brq.cmd.error || brq.data.error || brq.stop.error) + if (brq.cmd.error || brq.data.error || brq.stop.error) { + if (brq.data.blocks > 1 && rq_data_dir(req) == READ) { + /* Redo read one sector at a time */ + printk(KERN_WARNING "%s: retrying using single " + "block read\n", req->rq_disk->disk_name); + disable_multi = 1; + continue; + } status = get_card_status(card, req); + } if (brq.cmd.error) { printk(KERN_ERR "%s: error %d sending read/write " @@ -348,8 +383,20 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req) #endif } - if (brq.cmd.error || brq.data.error || brq.stop.error) + if (brq.cmd.error || brq.stop.error || brq.data.error) { + if (rq_data_dir(req) == READ) { + /* + * After an error, we redo I/O one sector at a + * time, so we only reach here after trying to + * read a single sector. + */ + spin_lock_irq(&md->lock); + ret = __blk_end_request(req, -EIO, brq.data.blksz); + spin_unlock_irq(&md->lock); + continue; + } goto cmd_err; + } /* * A block was successfully transferred. @@ -371,25 +418,20 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req) * If the card is not SD, we can still ok written sectors * as reported by the controller (which might be less than * the real number of written sectors, but never more). - * - * For reads we just fail the entire chunk as that should - * be safe in all cases. */ - if (rq_data_dir(req) != READ) { - if (mmc_card_sd(card)) { - u32 blocks; + if (mmc_card_sd(card)) { + u32 blocks; - blocks = mmc_sd_num_wr_blocks(card); - if (blocks != (u32)-1) { - spin_lock_irq(&md->lock); - ret = __blk_end_request(req, 0, blocks << 9); - spin_unlock_irq(&md->lock); - } - } else { + blocks = mmc_sd_num_wr_blocks(card); + if (blocks != (u32)-1) { spin_lock_irq(&md->lock); - ret = __blk_end_request(req, 0, brq.data.bytes_xfered); + ret = __blk_end_request(req, 0, blocks << 9); spin_unlock_irq(&md->lock); } + } else { + spin_lock_irq(&md->lock); + ret = __blk_end_request(req, 0, brq.data.bytes_xfered); + spin_unlock_irq(&md->lock); } mmc_release_host(card->host); -- cgit v1.2.2