scsi: smartpqi: Add support for CCISS_BIG_PASSTHRU ioctl

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Add pqi_big_passthru_ioctl() to handle CCISS_BIG_PASSTHRU ioctl
requests. The existing passthru ioctl uses a 16-bit integer for the I/O
buffer size, limiting transfers to 64KB. The big passthru ioctl uses
BIG_IOCTL_Command_struct which stores the buffer size as a 32-bit integer,
allowing larger transfers required by some management utilities.

Add CCISS_BIG_PASSTHRU_SUPPORTED to uapi/linux/cciss_ioctl.h and return 0
from pqi_ioctl() to advertise driver support.  Userspace tools can send
this ioctl to probe whether the driver supports CCISS_BIG_PASSTHRU before
issuing it.

Co-developed-by: Mike McGowen <mike.mcgowen@microchip.com>
Signed-off-by: Mike McGowen <mike.mcgowen@microchip.com>
Signed-off-by: David Strahan <david.strahan@microchip.com>
Acked-by: Don Brace <don.brace@microchip.com>
Link: https://lore.kernel.org/linux-scsi/20260722220401.6357-3-david.strahan@microchip.com/
Link: https://lore.kernel.org/linux-scsi/20260722220401.6357-1-david.strahan@microchip.com/
Link: https://patch.msgid.link/20260722220401.6357-3-david.strahan@microchip.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

...

This commit is contained in:

David Strahan 2026-07-22 17:03:59 -05:00 • committed by Martin K. Petersen

parent 225548863f

commit c64b2ab2ff

2 changed files with 145 additions and 0 deletions

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144

drivers/scsi/smartpqi/smartpqi_init.c

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1

include/uapi/linux/cciss_ioctl.h

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