On 22 September 2017 at 14:36, Adrian Hunter <adrian.hunter@xxxxxxxxx> wrote: > Hi > > Here is V9 of the hardware command queue patches without the software > command queue patches, now using blk-mq and now with blk-mq support for > non-CQE I/O. > > HW CMDQ offers 25% - 50% better random multi-threaded I/O. I see a slight > 2% drop in sequential read speed but no change to sequential write. > > Non-CQE blk-mq showed a 3% decrease in sequential read performance. This > seemed to be coming from the inferior latency of running work items compared > with a dedicated thread. Hacking blk-mq workqueue to be unbound reduced the > performance degradation from 3% to 1%. > > While we should look at changing blk-mq to give better workqueue performance, > a bigger gain is likely to be made by adding a new host API to enable the > next already-prepared request to be issued directly from within ->done() > callback of the current request. I have looked at patch 1->8, and those looks nice to me so I have applied those for next. I will do my best to review the rest asap, however I am currently traveling so in worst case it will have wait until next week. Thanks and kind regards! Uffe > > > Changes since V8: > Re-based > mmc: core: Introduce host claiming by context > Slightly simplified as per Ulf > mmc: core: Export mmc_retune_hold_now() and mmc_retune_release() > New patch. > mmc: block: Add CQE and blk-mq support > Fix missing ->post_req() on the error path > > Changes since V7: > Re-based > mmc: core: Introduce host claiming by context > Slightly simplified > mmc: core: Add parameter use_blk_mq > New patch. > mmc: core: Remove unnecessary host claim > New patch. > mmc: core: Export mmc_start_bkops() > New patch. > mmc: core: Export mmc_start_request() > New patch. > mmc: block: Add CQE and blk-mq support > Add blk-mq support for non_CQE requests > > Changes since V6: > mmc: core: Introduce host claiming by context > New patch. > mmc: core: Move mmc_start_areq() declaration > Dropped because it has been applied > mmc: block: Fix block status codes > Dropped because it has been applied > mmc: host: Add CQE interface > Dropped because it has been applied > mmc: core: Turn off CQE before sending commands > Dropped because it has been applied > mmc: block: Factor out mmc_setup_queue() > New patch. > mmc: block: Add CQE support > Drop legacy support and add blk-mq support > > Changes since V5: > Re-based > mmc: core: Add mmc_retune_hold_now() > Dropped because it has been applied > mmc: core: Add members to mmc_request and mmc_data for CQE's > Dropped because it has been applied > mmc: core: Move mmc_start_areq() declaration > New patch at Ulf's request > mmc: block: Fix block status codes > Another un-related patch > mmc: host: Add CQE interface > Move recovery_notifier() callback to struct mmc_request > mmc: core: Add support for handling CQE requests > Roll __mmc_cqe_request_done() into mmc_cqe_request_done() > Move function declarations requested by Ulf > mmc: core: Remove unused MMC_CAP2_PACKED_CMD > Dropped because it has been applied > mmc: block: Add CQE support > Add explanation to commit message > Adjustment for changed recovery_notifier() callback > mmc: cqhci: support for command queue enabled host > Adjustment for changed recovery_notifier() callback > mmc: sdhci-pci: Add CQHCI support for Intel GLK > Add DCMD capability for Intel controllers except GLK > > Changes since V4: > mmc: core: Add mmc_retune_hold_now() > Add explanation to commit message. > mmc: host: Add CQE interface > Add comments to callback declarations. > mmc: core: Turn off CQE before sending commands > Add explanation to commit message. > mmc: core: Add support for handling CQE requests > Add comments as requested by Ulf. > mmc: core: Remove unused MMC_CAP2_PACKED_CMD > New patch. > mmc: mmc: Enable Command Queuing > Adjust for removal of MMC_CAP2_PACKED_CMD. > Add a comment about Packed Commands. > mmc: mmc: Enable CQE's > Remove un-necessary check for MMC_CAP2_CQE > mmc: block: Use local variables in mmc_blk_data_prep() > New patch. > mmc: block: Prepare CQE data > Adjust due to "mmc: block: Use local variables in mmc_blk_data_prep()" > Remove priority setting. > Add explanation to commit message. > mmc: cqhci: support for command queue enabled host > Fix transfer descriptor setting in cqhci_set_tran_desc() for 32-bit DMA > > Changes since V3: > Adjusted ...blk_end_request...() for new block status codes > Fixed CQHCI transaction descriptor for "no DCMD" case > > Changes since V2: > Dropped patches that have been applied. > Re-based > Added "mmc: sdhci-pci: Add CQHCI support for Intel GLK" > > Changes since V1: > > "Share mmc request array between partitions" is dependent > on changes in "Introduce queue semantics", so added that > and block fixes: > > Added "Fix is_waiting_last_req set incorrectly" > Added "Fix cmd error reset failure path" > Added "Use local var for mqrq_cur" > Added "Introduce queue semantics" > > Changes since RFC: > > Re-based on next. > Added comment about command queue priority. > Added some acks and reviews. > > > Adrian Hunter (14): > mmc: core: Remove unnecessary host claim > mmc: core: Introduce host claiming by context > mmc: core: Add support for handling CQE requests > mmc: mmc: Enable Command Queuing > mmc: mmc: Enable CQE's > mmc: block: Use local variables in mmc_blk_data_prep() > mmc: block: Prepare CQE data > mmc: block: Factor out mmc_setup_queue() > mmc: core: Add parameter use_blk_mq > mmc: core: Export mmc_start_bkops() > mmc: core: Export mmc_start_request() > mmc: core: Export mmc_retune_hold_now() and mmc_retune_release() > mmc: block: Add CQE and blk-mq support > mmc: sdhci-pci: Add CQHCI support for Intel GLK > > Venkat Gopalakrishnan (1): > mmc: cqhci: support for command queue enabled host > > drivers/mmc/Kconfig | 11 + > drivers/mmc/core/block.c | 779 ++++++++++++++++++++++++- > drivers/mmc/core/block.h | 8 + > drivers/mmc/core/bus.c | 7 + > drivers/mmc/core/core.c | 221 ++++++- > drivers/mmc/core/core.h | 17 +- > drivers/mmc/core/host.c | 9 +- > drivers/mmc/core/host.h | 11 +- > drivers/mmc/core/mmc.c | 33 +- > drivers/mmc/core/mmc_ops.c | 6 +- > drivers/mmc/core/queue.c | 466 +++++++++++++-- > drivers/mmc/core/queue.h | 54 +- > drivers/mmc/core/sd.c | 4 +- > drivers/mmc/core/sdio_irq.c | 3 +- > drivers/mmc/host/Kconfig | 14 + > drivers/mmc/host/Makefile | 1 + > drivers/mmc/host/cqhci.c | 1154 +++++++++++++++++++++++++++++++++++++ > drivers/mmc/host/cqhci.h | 240 ++++++++ > drivers/mmc/host/sdhci-pci-core.c | 155 ++++- > include/linux/mmc/host.h | 10 +- > 20 files changed, 3108 insertions(+), 95 deletions(-) > create mode 100644 drivers/mmc/host/cqhci.c > create mode 100644 drivers/mmc/host/cqhci.h > > > Regards > Adrian -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
