On 05/02/2019 18:23, Christoph Hellwig wrote:

On Tue, Feb 05, 2019 at 03:09:28PM +0000, John Garry wrote:

quoted

For SCSI devices, unfortunately not all IO sent to the HW originates from
blk-mq or any other single entity.

Where else would SCSI I/O originate from?

Please note that I was referring to other management IO, like SAS SMP, 
TMFs, and other proprietary commands which the driver may generate for 
the HBA - https://marc.info/?l=linux-scsi&m=154831889001973&w=2 
discusses some of them also.

Thanks,
John

.