blk-mq-sched: add framework for MQ capable IO schedulers
This adds a set of hooks that intercepts the blk-mq path of allocating/inserting/issuing/completing requests, allowing us to develop a scheduler within that framework. We reuse the existing elevator scheduler API on the registration side, but augment that with the scheduler flagging support for the blk-mq interfce, and with a separate set of ops hooks for MQ devices. We split driver and scheduler tags, so we can run the scheduling independently of device queue depth. Signed-off-by:Jens Axboe <axboe@fb.com> Reviewed-by:
Bart Van Assche <bart.vanassche@sandisk.com> Reviewed-by:
Omar Sandoval <osandov@fb.com>
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