[PATCHv2] mmc: block: Add single read for 4k sector cards

Christian Löhle
2022-06-24T15:29:18Z

Cards with 4k native sector size may only be read 4k-aligned,
accommodate for this in the single read recovery and use it.

Fixes: 81196976ed946 (mmc: block: Add blk-mq support)
Signed-off-by: Christian Loehle <cloehle@hyperstone.com>
---
drivers/mmc/core/block.c | 25 ++++++++++++-------------
1 file changed, 12 insertions(+), 13 deletions(-)

diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
index f4a1281658db..a75a208ce203 100644
--- a/drivers/mmc/core/block.c
+++ b/drivers/mmc/core/block.c
@@ -176,7 +176,7 @@ static inline int mmc_blk_part_switch(struct mmc_card *card,
unsigned int part_type);
static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
struct mmc_card *card,
- int disable_multi,
+ int recovery_mode,
struct mmc_queue *mq);
static void mmc_blk_hsq_req_done(struct mmc_request *mrq);

@@ -1302,7 +1302,7 @@ static void mmc_blk_eval_resp_error(struct mmc_blk_request *brq)
}

static void mmc_blk_data_prep(struct mmc_queue *mq, struct mmc_queue_req *mqrq,
- int disable_multi, bool *do_rel_wr_p,
+ int recovery_mode, bool *do_rel_wr_p,
bool *do_data_tag_p)
{
struct mmc_blk_data *md = mq->blkdata;
@@ -1372,8 +1372,8 @@ static void mmc_blk_data_prep(struct mmc_queue *mq, struct mmc_queue_req *mqrq,
* at a time in order to accurately determine which
* sectors can be read successfully.
*/
- if (disable_multi)
- brq->data.blocks = 1;
+ if (recovery_mode)
+ brq->data.blocks = mmc_large_sector(card) ? 8 : 1;

/*
* Some controllers have HW issues while operating
@@ -1590,7 +1590,7 @@ static int mmc_blk_cqe_issue_rw_rq(struct mmc_queue *mq, struct request *req)

static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
struct mmc_card *card,
- int disable_multi,
+ int recovery_mode,
struct mmc_queue *mq)
{
u32 readcmd, writecmd;
@@ -1599,7 +1599,7 @@ static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
struct mmc_blk_data *md = mq->blkdata;
bool do_rel_wr, do_data_tag;

- mmc_blk_data_prep(mq, mqrq, disable_multi, &do_rel_wr, &do_data_tag);
+ mmc_blk_data_prep(mq, mqrq, recovery_mode, &do_rel_wr, &do_data_tag);

brq->mrq.cmd = &brq->cmd;

@@ -1690,7 +1690,7 @@ static int mmc_blk_fix_state(struct mmc_card *card, struct request *req)

#define MMC_READ_SINGLE_RETRIES 2

-/* Single sector read during recovery */
+/* Single (native) sector read during recovery */
static void mmc_blk_read_single(struct mmc_queue *mq, struct request *req)
{
struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
@@ -1698,6 +1698,7 @@ static void mmc_blk_read_single(struct mmc_queue *mq, struct request *req)
struct mmc_card *card = mq->card;
struct mmc_host *host = card->host;
blk_status_t error = BLK_STS_OK;
+ size_t bytes_per_read = mmc_large_sector(card) ? 4096 : 512;

do {
u32 status;
@@ -1732,13 +1733,13 @@ static void mmc_blk_read_single(struct mmc_queue *mq, struct request *req)
else
error = BLK_STS_OK;

- } while (blk_update_request(req, error, 512));
+ } while (blk_update_request(req, error, bytes_per_read));

return;

error_exit:
mrq->data->bytes_xfered = 0;
- blk_update_request(req, BLK_STS_IOERR, 512);
+ blk_update_request(req, BLK_STS_IOERR, bytes_per_read);
/* Let it try the remaining request again */
if (mqrq->retries > MMC_MAX_RETRIES - 1)
mqrq->retries = MMC_MAX_RETRIES - 1;
@@ -1879,10 +1880,8 @@ static void mmc_blk_mq_rw_recovery(struct mmc_queue *mq, struct request *req)
return;
}

- /* FIXME: Missing single sector read for large sector size */
- if (!mmc_large_sector(card) && rq_data_dir(req) == READ &&
- brq->data.blocks > 1) {
- /* Read one sector at a time */
+ if (rq_data_dir(req) == READ && brq->data.blocks > 1) {
+ /* Read one (native) sector at a time */
mmc_blk_read_single(mq, req);
return;
}
--
2.36.1

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