Hi Jens, This patch series improves small write IOPS by a factor of four (+300%) for zoned UFS devices on my test setup with an UFSHCI 3.0 controller. Please consider this patch series for the next merge window. Thank you, Bart. Changes compared to v7: - Split the queue_limits member variable `use_zone_write_lock' into two member variables: `use_zone_write_lock' (set by disk_set_zoned()) and `driver_preserves_write_order' (set by the block driver or SCSI LLD). This should clear up the confusion about the purpose of this variable. - Moved the code for sorting SCSI commands by LBA from the SCSI error handler into the SCSI disk (sd) driver as requested by Christoph. Changes compared to v6: - Removed QUEUE_FLAG_NO_ZONE_WRITE_LOCK and instead introduced a flag in the request queue limits data structure. Changes compared to v5: - Renamed scsi_cmp_lba() into scsi_cmp_sector(). - Improved several source code comments. Changes compared to v4: - Dropped the patch that introduces the REQ_NO_ZONE_WRITE_LOCK flag. - Dropped the null_blk patch and added two scsi_debug patches instead. - Dropped the f2fs patch. - Split the patch for the UFS driver into two patches. - Modified several patch descriptions and source code comments. - Renamed dd_use_write_locking() into dd_use_zone_write_locking(). - Moved the list_sort() call from scsi_unjam_host() into scsi_eh_flush_done_q() such that sorting happens just before reinserting. - Removed the scsi_cmd_retry_allowed() call from scsi_check_sense() to make sure that the retry counter is adjusted once per retry instead of twice. Changes compared to v3: - Restored the patch that introduces QUEUE_FLAG_NO_ZONE_WRITE_LOCK. That patch had accidentally been left out from v2. - In patch "block: Introduce the flag REQ_NO_ZONE_WRITE_LOCK", improved the patch description and added the function blk_no_zone_write_lock(). - In patch "block/mq-deadline: Only use zone locking if necessary", moved the blk_queue_is_zoned() call into dd_use_write_locking(). - In patch "fs/f2fs: Disable zone write locking", set REQ_NO_ZONE_WRITE_LOCK from inside __bio_alloc() instead of in f2fs_submit_write_bio(). Changes compared to v2: - Renamed the request queue flag for disabling zone write locking. - Introduced a new request flag for disabling zone write locking. - Modified the mq-deadline scheduler such that zone write locking is only disabled if both flags are set. - Added an F2FS patch that sets the request flag for disabling zone write locking. - Only disable zone write locking in the UFS driver if auto-hibernation is disabled. Changes compared to v1: - Left out the patches that are already upstream. - Switched the approach in patch "scsi: Retry unaligned zoned writes" from retrying immediately to sending unaligned write commands to the SCSI error handler. Bart Van Assche (9): block: Introduce more member variables related to zone write locking block/mq-deadline: Only use zone locking if necessary scsi: core: Call .eh_prepare_resubmit() before resubmitting scsi: sd: Sort commands by LBA before resubmitting scsi: core: Retry unaligned zoned writes scsi: scsi_debug: Support disabling zone write locking scsi: scsi_debug: Support injecting unaligned write errors scsi: ufs: Split an if-condition scsi: ufs: Inform the block layer about write ordering block/blk-settings.c | 7 +++ block/mq-deadline.c | 14 +++--- drivers/scsi/Kconfig | 2 + drivers/scsi/Kconfig.kunit | 4 ++ drivers/scsi/Makefile | 2 + drivers/scsi/Makefile.kunit | 1 + drivers/scsi/scsi_debug.c | 20 +++++++- drivers/scsi/scsi_error.c | 59 ++++++++++++++++++++++ drivers/scsi/scsi_error_test.c | 92 ++++++++++++++++++++++++++++++++++ drivers/scsi/scsi_lib.c | 1 + drivers/scsi/scsi_priv.h | 1 + drivers/scsi/sd.c | 25 +++++++++ drivers/ufs/core/ufshcd.c | 40 +++++++++++++-- include/linux/blkdev.h | 10 ++++ include/scsi/scsi.h | 1 + include/scsi/scsi_driver.h | 1 + 16 files changed, 270 insertions(+), 10 deletions(-) create mode 100644 drivers/scsi/Kconfig.kunit create mode 100644 drivers/scsi/Makefile.kunit create mode 100644 drivers/scsi/scsi_error_test.c
