kernel/linux.git/include/scsi/scsi_host.h, branch linux-7.0.y

scsi: Change the return type of the .queuecommand() callback

2026-01-24T02:32:34+00:00

In clang version 21.1 and later the -Wimplicit-enum-enum-cast warning option has been introduced. This warning is enabled by default and can be used to catch .queuecommand() implementations that return another value than 0 or one of the SCSI_MLQUEUE_* constants. Hence this patch that changes the return type of the .queuecommand() implementations from 'int' into 'enum scsi_qc_status'. No functionality has been changed. Cc: Damien Le Moal Cc: John Garry Signed-off-by: Bart Van Assche Link: https://patch.msgid.link/20260115210357.2501991-6-bvanassche@acm.org Signed-off-by: Martin K. Petersen

scsi: core: Introduce .queue_reserved_command()

2025-11-12T22:02:31+00:00

Reserved commands will be used by SCSI LLDs for submitting internal commands. Since the SCSI host, target and device limits do not apply to the reserved command use cases, bypass the SCSI host limit checks for reserved commands. Introduce the .queue_reserved_command() callback for reserved commands. Additionally, do not activate the SCSI error handler if a reserved command fails such that reserved commands can be submitted from inside the SCSI error handler. [ bvanassche: modified patch title and patch description. Renamed .reserved_queuecommand() into .queue_reserved_command(). Changed the second argument of __blk_mq_end_request() from 0 into error code in the completion path if cmd->result != 0. Rewrote the scsi_queue_rq() changes. See also https://lore.kernel.org/linux-scsi/1666693096-180008-5-git-send-email-john.garry@huawei.com/ ] Cc: Hannes Reinecke Signed-off-by: John Garry Signed-off-by: Bart Van Assche Reviewed-by: Hannes Reinecke Link: https://patch.msgid.link/20251031204029.2883185-6-bvanassche@acm.org Signed-off-by: Martin K. Petersen

scsi: core: Support allocating a pseudo SCSI device

2025-11-12T22:02:31+00:00

Allocate a pseudo SCSI device if 'nr_reserved_cmds' has been set. Pseudo SCSI devices have the SCSI ID :U64_MAX so they won't clash with any devices the LLD might create. Pseudo SCSI devices are excluded from scanning and will not show up in sysfs. Additionally, pseudo SCSI devices are skipped by shost_for_each_device(). This prevents that the SCSI error handler tries to submit a reset to a non-existent logical unit. Do not allocate a budget map for pseudo SCSI devices since the cmd_per_lun limit does not apply to pseudo SCSI devices. Do not perform queue depth ramp up / ramp down for pseudo SCSI devices. Pseudo SCSI devices will be used to send internal commands to a storage device. [ bvanassche: edited patch description / renamed host_sdev into pseudo_sdev / unexported scsi_get_host_dev() / modified error path in scsi_get_pseudo_dev() / skip pseudo devices in __scsi_iterate_devices() and also when calling sdev_init(), sdev_configure() and sdev_destroy(). See also https://lore.kernel.org/linux-scsi/20211125151048.103910-2-hare@suse.de/ ] Reviewed-by: John Garry Signed-off-by: Hannes Reinecke Signed-off-by: Bart Van Assche Link: https://patch.msgid.link/20251031204029.2883185-5-bvanassche@acm.org Signed-off-by: Martin K. Petersen

scsi: core: Support allocating reserved commands

2025-11-12T22:02:30+00:00

Quite some drivers are using management commands internally. These commands typically use the same tag pool as regular SCSI commands. Tags for these management commands are set aside before allocating the block-mq tag bitmap for regular SCSI commands. The block layer already supports this via the reserved tag mechanism. Add a new field 'nr_reserved_cmds' to the SCSI host template to instruct the block layer to set aside a tag space for these management commands by using reserved tags. Exclude reserved commands from .can_queue because .can_queue is visible in sysfs. [ bvanassche: modified patch title and patch description. Left out the following statements: "if (sht->nr_reserved_cmds)" and also "if (sdev->host->nr_reserved_cmds) flags |= BLK_MQ_REQ_RESERVED;". Moved nr_reserved_cmds declarations and statements close to the corresponding can_queue declarations and statements. See also https://lore.kernel.org/linux-scsi/20210503150333.130310-11-hare@suse.de/ ] Signed-off-by: Hannes Reinecke Reviewed-by: John Garry Signed-off-by: Bart Van Assche Link: https://patch.msgid.link/20251031204029.2883185-2-bvanassche@acm.org Signed-off-by: Martin K. Petersen

scsi: switch ->bios_param() to passing gendisk

2025-08-13T06:59:28+00:00

Instances are passed struct block_device *bdev argument; the only thing it is used for (if it's used in the first place) is bdev->bd_disk. Might as well pass that in the first place... Reviewed-by: Martin K. Petersen Reviewed-by: Christoph Hellwig Acked-by: Jens Axboe Signed-off-by: Al Viro

scsi: remove the no_highmem flag in the host

2025-05-05T19:22:39+00:00

All users are gone now. Signed-off-by: Christoph Hellwig Reviewed-by: Hannes Reinecke Reviewed-by: John Garry Reviewed-by: Johannes Thumshirn Link: https://lore.kernel.org/r/20250505081138.3435992-6-hch@lst.de Signed-off-by: Jens Axboe

Merge tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi

2025-01-27T00:12:44+00:00

Pull SCSI updates from James Bottomley: "Updates to the usual drivers (ufs, lpfc, fnic, qla2xx, mpi3mr). The major core change is the renaming of the slave_ methods plus a bit of constification. The rest are minor updates and fixes" * tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi: (103 commits) scsi: fnic: Propagate SCSI error code from fnic_scsi_drv_init() scsi: fnic: Test for memory allocation failure and return error code scsi: fnic: Return appropriate error code from failure of scsi drv init scsi: fnic: Return appropriate error code for mem alloc failure scsi: fnic: Remove always-true IS_FNIC_FCP_INITIATOR macro scsi: fnic: Fix use of uninitialized value in debug message scsi: fnic: Delete incorrect debugfs error handling scsi: fnic: Remove unnecessary else to fix warning in FDLS FIP scsi: fnic: Remove extern definition from .c files scsi: fnic: Remove unnecessary else and unnecessary break in FDLS scsi: mpi3mr: Fix possible crash when setting up bsg fails scsi: ufs: bsg: Set bsg_queue to NULL after removal scsi: ufs: bsg: Delete bsg_dev when setting up bsg fails scsi: st: Don't set pos_unknown just after device recognition scsi: aic7xxx: Fix build 'aicasm' warning scsi: Revert "scsi: ufs: core: Probe for EXT_IID support" scsi: storvsc: Ratelimit warning logs to prevent VM denial of service scsi: scsi_debug: Constify sdebug_driver_template scsi: documentation: Corrections for struct updates scsi: driver-api: documentation: Change what is added to docbook ...

block: simplify tag allocation policy selection

2025-01-06T14:37:41+00:00

Use a plain BLK_MQ_F_* flag to select the round robin tag selection instead of overlaying an enum with just two possible values into the flags space. Doing so allows adding a BLK_MQ_F_MAX sentinel for simplified overflow checking in the messy debugfs helpers. Signed-off-by: Christoph Hellwig Reviewed-by: John Garry Link: https://lore.kernel.org/r/20250106083531.799976-5-hch@lst.de Signed-off-by: Jens Axboe

scsi: Eliminate scsi_register() and scsi_unregister() usage & docs

2024-12-10T02:53:01+00:00

scsi_mid_low_api.rst refers to scsi_register() and scsi_unregister() but these functions don't exist. They have been replaced by more meaningful names. Update one driver (megaraid_mbox.c) that uses "scsi_unregister" in a warning message. Update scsi_mid_low_api.rst to eliminate references to scsi_register() and scsi_unregister(). Signed-off-by: Randy Dunlap Link: https://lore.kernel.org/r/20241205041839.164404-1-rdunlap@infradead.org Cc: James E.J. Bottomley Cc: Martin K. Petersen Cc: Bart Van Assche Cc: Jonathan Corbet Cc: linux-doc@vger.kernel.org Cc: Kashyap Desai Cc: Sumit Saxena Cc: Shivasharan S Cc: Chandrakanth patil Cc: megaraidlinux.pdl@broadcom.com Signed-off-by: Martin K. Petersen

scsi: core: Remove the .slave_configure() method

2024-12-04T20:34:28+00:00

Now that all SCSI drivers have been converted from .slave_configure() to .sdev_configure(), remove support for .slave_configure() from the SCSI core. Reviewed-by: Damien Le Moal Signed-off-by: Bart Van Assche Link: https://lore.kernel.org/r/20241022180839.2712439-5-bvanassche@acm.org Signed-off-by: Martin K. Petersen