| Message ID | 20210322133645.4901-2-avri.altman@wdc.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Do not flush cache when it is disabled | expand |
On 22/03/21 3:36 pm, Avri Altman wrote: > The cache may be flushed to the nonvolatile storage by writing to > FLUSH_CACHE byte (EXT_CSD byte [32]). When in command queueing mode, the > cache may be flushed by issuing a CMDQ_TASK_ DEV_MGMT (CMD48) with a > FLUSH_CACHE op-code. Either way, verify that The cache function is > turned ON before doing so. > > fixes: 1e8e55b67030 (mmc: block: Add CQE support) > > Reported-by: Brendan Peter <bpeter@lytx.com> > Tested-by: Brendan Peter <bpeter@lytx.com> > Signed-off-by: Avri Altman <avri.altman@wdc.com> > --- > drivers/mmc/core/block.c | 3 +++ > drivers/mmc/core/mmc_ops.c | 4 +--- > drivers/mmc/core/mmc_ops.h | 5 +++++ > 3 files changed, 9 insertions(+), 3 deletions(-) > > diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c > index 42e27a298218..a93c66aa91db 100644 > --- a/drivers/mmc/core/block.c > +++ b/drivers/mmc/core/block.c > @@ -1473,6 +1473,9 @@ static int mmc_blk_cqe_issue_flush(struct mmc_queue *mq, struct request *req) > struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req); > struct mmc_request *mrq = mmc_blk_cqe_prep_dcmd(mqrq, req); > > + if (mmc_card_mmc(mq->card) && !mmc_flush_allowed(mq->card)) > + return 0; Returning 0 means the flush was issued successfully. i.e. it is in flight. Instead, a call to blk_mq_end_request(req, BLK_STS_OK) is needed, and mmc_blk_mq_issue_rq() must be amended so that it will return MMC_REQ_DONE for this case. > + > mrq->cmd->opcode = MMC_SWITCH; > mrq->cmd->arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) | > (EXT_CSD_FLUSH_CACHE << 16) | > diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c > index baa6314f69b4..b8a0c9ac8a20 100644 > --- a/drivers/mmc/core/mmc_ops.c > +++ b/drivers/mmc/core/mmc_ops.c > @@ -988,9 +988,7 @@ int mmc_flush_cache(struct mmc_card *card) > { > int err = 0; > > - if (mmc_card_mmc(card) && > - (card->ext_csd.cache_size > 0) && > - (card->ext_csd.cache_ctrl & 1)) { > + if (mmc_card_mmc(card) && mmc_flush_allowed(card)) { > err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, > EXT_CSD_FLUSH_CACHE, 1, > MMC_CACHE_FLUSH_TIMEOUT_MS); > diff --git a/drivers/mmc/core/mmc_ops.h b/drivers/mmc/core/mmc_ops.h > index 632009260e51..bf2b315addd7 100644 > --- a/drivers/mmc/core/mmc_ops.h > +++ b/drivers/mmc/core/mmc_ops.h > @@ -19,6 +19,11 @@ enum mmc_busy_cmd { > struct mmc_host; > struct mmc_card; > > +static inline bool mmc_flush_allowed(struct mmc_card *card) > +{ > + return card->ext_csd.cache_size > 0 && (card->ext_csd.cache_ctrl & 1); > +} > + > int mmc_select_card(struct mmc_card *card); > int mmc_deselect_cards(struct mmc_host *host); > int mmc_set_dsr(struct mmc_host *host); >
diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c index 42e27a298218..a93c66aa91db 100644 --- a/drivers/mmc/core/block.c +++ b/drivers/mmc/core/block.c @@ -1473,6 +1473,9 @@ static int mmc_blk_cqe_issue_flush(struct mmc_queue *mq, struct request *req) struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req); struct mmc_request *mrq = mmc_blk_cqe_prep_dcmd(mqrq, req); + if (mmc_card_mmc(mq->card) && !mmc_flush_allowed(mq->card)) + return 0; + mrq->cmd->opcode = MMC_SWITCH; mrq->cmd->arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) | (EXT_CSD_FLUSH_CACHE << 16) | diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c index baa6314f69b4..b8a0c9ac8a20 100644 --- a/drivers/mmc/core/mmc_ops.c +++ b/drivers/mmc/core/mmc_ops.c @@ -988,9 +988,7 @@ int mmc_flush_cache(struct mmc_card *card) { int err = 0; - if (mmc_card_mmc(card) && - (card->ext_csd.cache_size > 0) && - (card->ext_csd.cache_ctrl & 1)) { + if (mmc_card_mmc(card) && mmc_flush_allowed(card)) { err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_FLUSH_CACHE, 1, MMC_CACHE_FLUSH_TIMEOUT_MS); diff --git a/drivers/mmc/core/mmc_ops.h b/drivers/mmc/core/mmc_ops.h index 632009260e51..bf2b315addd7 100644 --- a/drivers/mmc/core/mmc_ops.h +++ b/drivers/mmc/core/mmc_ops.h @@ -19,6 +19,11 @@ enum mmc_busy_cmd { struct mmc_host; struct mmc_card; +static inline bool mmc_flush_allowed(struct mmc_card *card) +{ + return card->ext_csd.cache_size > 0 && (card->ext_csd.cache_ctrl & 1); +} + int mmc_select_card(struct mmc_card *card); int mmc_deselect_cards(struct mmc_host *host); int mmc_set_dsr(struct mmc_host *host);