This is v2 of original series from Hannes, which I'm hijacking for the moment: https://patchwork.kernel.org/cover/10967071/ And the background: Quite some drivers use internal commands for various purposes, most commonly sending TMFs or querying the HBA status. While these commands use the same submission mechanism than normal I/O commands, they will not be counted as outstanding commands, requiring those drivers to implement their own mechanism to figure out outstanding commands. This patchset enables the use of reserved tags for the SCSI midlayer, enabling LLDDs to rely on the block layer for tracking outstanding commands. More importantly, it allows LLDD to request a valid tag from the block layer without having to implement some tracking mechanism within the driver. This removes quite some hacks which were required for some drivers (eg. fnic or snic). Finally: As I see, there is no dependency on this series to go into the kernel now. And we need it for [0]. Note: [0] also depends on [1] [0] https://lore.kernel.org/linux-block/1583409280-158604-1-git-send-email-john.garry@xxxxxxxxxx/T/#t [1] https://lore.kernel.org/linux-block/20191014015043.25029-1-ming.lei@xxxxxxxxxx/ Differences to v1: - Make scsi_{get, put}_reserved_cmd() for Scsi host - Previously we separate scsi_{get, put}_reserved_cmd() for sdev and scsi_host_get_reserved_cmd() for the host - Fix how Scsi_Host.can_queue is set in the virtio-scsi change - Drop Scsi_Host.use_reserved_cmd_q - Drop scsi_is_reserved_cmd() - It was unused - But keep blk_mq_rq_is_reserved() - Add support in libsas and associated HBA drivers - Allocate reserved command in slow task - Switch hisi_sas to use reserved Scsi command - Reorder the series a little - Some tidying Hannes Reinecke (22): scsi: add 'nr_reserved_cmds' field to the SCSI host template scsi: allocate separate queue for reserved commands blk-mq: Implement blk_mq_rq_is_reserved() scsi: Add scsi_{get, put}_reserved_cmd() csiostor: use reserved command for LUN reset scsi: add scsi_cmd_from_priv() virtio_scsi: use reserved commands for TMF scsi: add host tagset busy iterator fnic: use reserved commands fnic: use scsi_host_tagset_busy_iter() to traverse commands hpsa: move hpsa_hba_inquiry after scsi_add_host() hpsa: use reserved commands hpsa: use blk_mq_tagset_busy_iter() to traverse outstanding commands hpsa: drop refcount field from CommandList snic: use reserved commands snic: use tagset iter for traversing commands aacraid: move scsi_add_host() aacraid: use private commands aacraid: replace cmd_list with scsi_host_tagset_busy_iter() aacraid: use scsi_host_tagset_busy_iter() to traverse outstanding commands dpt_i2o: drop cmd_list usage scsi: drop scsi command list John Garry (2): scsi: libsas: aic94xx: hisi_sas: mvsas: pm8001: Allocate Scsi_cmd for slow task scsi: hisi_sas: Use libsas slow task SCSI command block/blk-mq.c | 13 + drivers/scsi/aacraid/aachba.c | 125 ++-- drivers/scsi/aacraid/aacraid.h | 6 +- drivers/scsi/aacraid/comminit.c | 28 +- drivers/scsi/aacraid/commsup.c | 134 ++-- drivers/scsi/aacraid/linit.c | 300 ++++---- drivers/scsi/csiostor/csio_init.c | 3 +- drivers/scsi/csiostor/csio_scsi.c | 49 +- drivers/scsi/dpt_i2o.c | 23 +- drivers/scsi/fnic/fnic_scsi.c | 917 +++++++++++-------------- drivers/scsi/hisi_sas/hisi_sas_main.c | 13 +- drivers/scsi/hisi_sas/hisi_sas_v3_hw.c | 5 +- drivers/scsi/hosts.c | 27 + drivers/scsi/hpsa.c | 313 ++++----- drivers/scsi/hpsa.h | 1 - drivers/scsi/hpsa_cmd.h | 1 - drivers/scsi/libsas/sas_expander.c | 3 +- drivers/scsi/libsas/sas_init.c | 36 +- drivers/scsi/mvsas/mv_sas.c | 2 +- drivers/scsi/pm8001/pm8001_hwi.c | 4 +- drivers/scsi/pm8001/pm8001_sas.c | 4 +- drivers/scsi/pm8001/pm80xx_hwi.c | 4 +- drivers/scsi/scsi.c | 1 - drivers/scsi/scsi_lib.c | 80 ++- drivers/scsi/scsi_scan.c | 1 - drivers/scsi/snic/snic.h | 2 +- drivers/scsi/snic/snic_main.c | 2 + drivers/scsi/snic/snic_scsi.c | 502 +++++++------- drivers/scsi/virtio_scsi.c | 107 ++- include/linux/blk-mq.h | 2 + include/scsi/libsas.h | 4 +- include/scsi/scsi_cmnd.h | 14 +- include/scsi/scsi_device.h | 1 - include/scsi/scsi_host.h | 14 +- 34 files changed, 1346 insertions(+), 1395 deletions(-) -- 2.17.1
