1e8e55b670
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>
22 lines
476 B
C
22 lines
476 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _MMC_CORE_BLOCK_H
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#define _MMC_CORE_BLOCK_H
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struct mmc_queue;
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struct request;
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void mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req);
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void mmc_blk_cqe_recovery(struct mmc_queue *mq);
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enum mmc_issued;
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enum mmc_issued mmc_blk_mq_issue_rq(struct mmc_queue *mq, struct request *req);
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void mmc_blk_mq_complete(struct request *req);
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struct work_struct;
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void mmc_blk_mq_complete_work(struct work_struct *work);
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#endif
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