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Subject[PATCH V13 09/10] mmc: block: blk-mq: Stop using card_busy_detect()
Date
card_busy_detect() doesn't set a correct timeout, and it doesn't take care
of error status bits. Stop using it for blk-mq.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
drivers/mmc/core/block.c | 117 +++++++++++++++++++++++++++++++++++++++++++----
1 file changed, 109 insertions(+), 8 deletions(-)

diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
index 0c29b1d8d545..5c5ff3c34313 100644
--- a/drivers/mmc/core/block.c
+++ b/drivers/mmc/core/block.c
@@ -1426,15 +1426,18 @@ static inline void mmc_apply_rel_rw(struct mmc_blk_request *brq,
}
}

-#define CMD_ERRORS \
- (R1_OUT_OF_RANGE | /* Command argument out of range */ \
- R1_ADDRESS_ERROR | /* Misaligned address */ \
+#define CMD_ERRORS_EXCL_OOR \
+ (R1_ADDRESS_ERROR | /* Misaligned address */ \
R1_BLOCK_LEN_ERROR | /* Transferred block length incorrect */\
R1_WP_VIOLATION | /* Tried to write to protected block */ \
R1_CARD_ECC_FAILED | /* Card ECC failed */ \
R1_CC_ERROR | /* Card controller error */ \
R1_ERROR) /* General/unknown error */

+#define CMD_ERRORS \
+ (CMD_ERRORS_EXCL_OOR | \
+ R1_OUT_OF_RANGE) /* Command argument out of range */ \
+
static void mmc_blk_eval_resp_error(struct mmc_blk_request *brq)
{
u32 val;
@@ -1951,6 +1954,95 @@ static void mmc_blk_ss_read(struct mmc_queue *mq, struct request *req)
mqrq->retries = MMC_NO_RETRIES;
}

+static inline bool mmc_blk_oor_valid(struct mmc_blk_request *brq)
+{
+ return !!brq->mrq.sbc;
+}
+
+static inline u32 mmc_blk_stop_err_bits(struct mmc_blk_request *brq)
+{
+ return mmc_blk_oor_valid(brq) ? CMD_ERRORS : CMD_ERRORS_EXCL_OOR;
+}
+
+static inline bool mmc_blk_in_tran_state(u32 status)
+{
+ /*
+ * Some cards mishandle the status bits, so make sure to check both the
+ * busy indication and the card state.
+ */
+ return status & R1_READY_FOR_DATA &&
+ (R1_CURRENT_STATE(status) == R1_STATE_TRAN);
+}
+
+static unsigned int mmc_blk_clock_khz(struct mmc_host *host)
+{
+ if (host->actual_clock)
+ return host->actual_clock / 1000;
+
+ /* Clock may be subject to a divisor, fudge it by a factor of 2. */
+ if (host->ios.clock)
+ return host->ios.clock / 2000;
+
+ /* How can there be no clock */
+ WARN_ON_ONCE(1);
+ return 100; /* 100 kHz is minimum possible value */
+}
+
+static unsigned long mmc_blk_data_timeout_jiffies(struct mmc_host *host,
+ struct mmc_data *data)
+{
+ unsigned int ms = DIV_ROUND_UP(data->timeout_ns, 1000000);
+ unsigned int khz;
+
+ if (data->timeout_clks) {
+ khz = mmc_blk_clock_khz(host);
+ ms += DIV_ROUND_UP(data->timeout_clks, khz);
+ }
+
+ return msecs_to_jiffies(ms);
+}
+
+static int mmc_blk_card_stuck(struct mmc_card *card, struct request *req,
+ u32 *resp_errs)
+{
+ struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
+ struct mmc_data *data = &mqrq->brq.data;
+ unsigned long timeout;
+ u32 status;
+ int err;
+
+ timeout = jiffies + mmc_blk_data_timeout_jiffies(card->host, data);
+
+ while (1) {
+ bool done = time_after(jiffies, timeout);
+
+ err = __mmc_send_status(card, &status, 5);
+ if (err) {
+ pr_err("%s: error %d requesting status\n",
+ req->rq_disk->disk_name, err);
+ break;
+ }
+
+ /* Accumulate any response error bits seen */
+ if (resp_errs)
+ *resp_errs |= status;
+
+ if (mmc_blk_in_tran_state(status))
+ break;
+
+ /* Timeout if the device never becomes ready */
+ if (done) {
+ pr_err("%s: Card stuck in wrong state! %s %s\n",
+ mmc_hostname(card->host),
+ req->rq_disk->disk_name, __func__);
+ err = -ETIMEDOUT;
+ break;
+ }
+ }
+
+ return err;
+}
+
static void mmc_blk_rw_recovery(struct mmc_queue *mq, struct request *req)
{
int type = rq_data_dir(req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE;
@@ -2097,17 +2189,26 @@ static inline bool mmc_blk_rq_error(struct mmc_blk_request *brq)
static int mmc_blk_card_busy(struct mmc_card *card, struct request *req)
{
struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
- bool gen_err = false;
+ u32 status = 0;
int err;

if (mmc_host_is_spi(card->host) || rq_data_dir(req) == READ)
return 0;

- err = card_busy_detect(card, MMC_BLK_TIMEOUT_MS, false, req, &gen_err);
+ err = mmc_blk_card_stuck(card, req, &status);
+
+ /*
+ * Do not assume data transferred correctly if there are any error bits
+ * set.
+ */
+ if (!err && status & mmc_blk_stop_err_bits(&mqrq->brq)) {
+ mqrq->brq.data.bytes_xfered = 0;
+ err = -EIO;
+ }

- /* Copy the general error bit so it will be seen later on */
- if (gen_err)
- mqrq->brq.stop.resp[0] |= R1_ERROR;
+ /* Copy the exception bit so it will be seen later on */
+ if (mmc_card_mmc(card) && status & R1_EXCEPTION_EVENT)
+ mqrq->brq.cmd.resp[0] |= R1_EXCEPTION_EVENT;

return err;
}
--
1.9.1
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