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author | Adrian Hunter <adrian.hunter@intel.com> | 2017-11-29 15:41:04 +0200 |
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committer | Ulf Hansson <ulf.hansson@linaro.org> | 2017-12-11 12:44:34 +0100 |
commit | 1e8e55b67030c6a2fef893d428bdcd611f73705c (patch) | |
tree | 3b6b1d8a5dc6a336ffb1058c02bdb4e50fe90c84 /drivers/mmc/core/block.h | |
parent | 81196976ed946cbf36bb41ddda402853c7df7cfa (diff) | |
download | linux-1e8e55b67030c6a2fef893d428bdcd611f73705c.tar.gz linux-1e8e55b67030c6a2fef893d428bdcd611f73705c.tar.bz2 linux-1e8e55b67030c6a2fef893d428bdcd611f73705c.zip |
mmc: block: Add CQE support
Add CQE support to the block driver, including:
- optionally using DCMD for flush requests
- "manually" issuing discard requests
- issuing read / write requests to the CQE
- supporting block-layer timeouts
- handling recovery
- supporting re-tuning
CQE offers 25% - 50% better random multi-threaded I/O. There is a slight
(e.g. 2%) drop in sequential read speed but no observable change to sequential
write.
CQE automatically sends the commands to complete requests. However it only
supports reads / writes and so-called "direct commands" (DCMD). Furthermore
DCMD is limited to one command at a time, but discards require 3 commands.
That makes issuing discards through CQE very awkward, but some CQE's don't
support DCMD anyway. So for discards, the existing non-CQE approach is
taken, where the mmc core code issues the 3 commands one at a time i.e.
mmc_erase(). Where DCMD is used, is for issuing flushes.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Tested-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/mmc/core/block.h')
-rw-r--r-- | drivers/mmc/core/block.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/mmc/core/block.h b/drivers/mmc/core/block.h index 6d34e87b18f6..f472ce5d5647 100644 --- a/drivers/mmc/core/block.h +++ b/drivers/mmc/core/block.h @@ -7,6 +7,8 @@ struct request; void mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req); +void mmc_blk_cqe_recovery(struct mmc_queue *mq); + enum mmc_issued; enum mmc_issued mmc_blk_mq_issue_rq(struct mmc_queue *mq, struct request *req); |