Currently SCSI low-level drivers are required to manage tags for commands which do not come via the block layer - libata internal commands would be an example of one of these. We want to make blk-mq manage these tags also. There was some work to provide "reserved commands" support in such series as https://lore.kernel.org/linux-scsi/20211125151048.103910-1-hare@xxxxxxx/ This was based on allocating a request for the lifetime of the "internal" command. This series tries to solve that problem by not just allocating the request but also sending it as a request through the block layer. Reasons to do this: - Normal flow of a request and also commonality for regular scsi command lifetime - We don't leave request and scsi_cmnd fields dangling as when we just allocate and free the request for the lifetime of the "internal" command - For poll mode support we can only poll in block layer, so could not send internal commands on poll mode queues if we did not do this, which is a problem - Can get rid of duplicated code like libsas internal command timeout handling Series part I contains core SCSI midlayer, libata, and libsas changes to queue libsas "slow" tasks as requests. Series part II of this series focused on changing libata to queue internal commands as requests. Testing: QEMU with AHCI with disk and cdrom attached, hisi_sas, pm8001. Branch containing all patches is at: https://github.com/hisilicon/kernel-dev/commits/private-topic-sas-6.1-block v2 was here: https://lore.kernel.org/linux-scsi/1654770559-101375-1-git-send-email-john.garry@xxxxxxxxxx/ Hannes Reinecke (1): scsi: core: Implement reserved command handling John Garry (21): blk-mq: Don't get budget for reserved requests scsi: core: Add scsi_get_dev() scsi: core: Add support to send reserved commands scsi: core: Add support for reserved command timeout handling scsi: libsas: Improve sas_ex_discover_expander() error handling scsi: libsas: Notify LLDD expander found before calling sas_rphy_add() scsi: scsi_transport_sas: Alloc sdev for expander scsi: libsas: Add sas_alloc_slow_task_rq() scsi: libsas: Add sas_queuecommand_internal() scsi: libsas: Add sas_internal_timeout() scsi: core: Use SCSI_SCAN_RESCAN in __scsi_add_device() scsi: scsi_transport_sas: Allocate end device target id in the rphy alloc ata: libata-scsi: Add ata_scsi_setup_sdev() scsi: libsas: Add sas_ata_setup_device() ata: libata-scsi: Allocate sdev early in port probe scsi: libsas drivers: Reserve tags scsi: libsas: Queue SMP commands as requests scsi: libsas: Queue TMF commands as requests scsi: core: Add scsi_alloc_request_hwq() scsi: libsas: Queue internal abort commands as requests scsi: libsas: Delete sas_task_slow.timer block/blk-mq.c | 4 +- drivers/ata/libata-eh.c | 1 + drivers/ata/libata-scsi.c | 49 ++++++++---- drivers/ata/libata.h | 1 + drivers/scsi/aic94xx/aic94xx_init.c | 3 + drivers/scsi/hisi_sas/hisi_sas_main.c | 40 +++++----- drivers/scsi/hisi_sas/hisi_sas_v1_hw.c | 3 + drivers/scsi/hisi_sas/hisi_sas_v2_hw.c | 3 + drivers/scsi/hisi_sas/hisi_sas_v3_hw.c | 7 ++ drivers/scsi/hosts.c | 16 ++++ drivers/scsi/isci/init.c | 3 + drivers/scsi/libsas/sas_ata.c | 20 +++++ drivers/scsi/libsas/sas_expander.c | 101 ++++++++++++++----------- drivers/scsi/libsas/sas_init.c | 61 ++++++++++++++- drivers/scsi/libsas/sas_internal.h | 5 ++ drivers/scsi/libsas/sas_scsi_host.c | 93 ++++++++++++----------- drivers/scsi/mvsas/mv_init.c | 7 ++ drivers/scsi/pm8001/pm8001_init.c | 8 +- drivers/scsi/scsi_error.c | 3 + drivers/scsi/scsi_lib.c | 42 +++++++++- drivers/scsi/scsi_scan.c | 29 ++++++- drivers/scsi/scsi_transport_sas.c | 34 ++++++--- include/linux/libata.h | 2 + include/scsi/libsas.h | 8 +- include/scsi/scsi_cmnd.h | 3 + include/scsi/scsi_host.h | 21 ++++- 26 files changed, 424 insertions(+), 143 deletions(-) -- 2.35.3
