linux-stable.git/include/linux/blk-mq.h, branch v4.12.2

blk-mq: remove blk_mq_abort_requeue_list()

2017-05-22T18:50:11+00:00

No one uses it any more, so remove it.

Reviewed-by: Keith Busch 
Reviewed-by: Johannes Thumshirn 
Signed-off-by: Ming Lei 
Signed-off-by: Christoph Hellwig

blk-mq-debugfs: allow schedulers to register debugfs attributes

2017-05-04T14:24:40+00:00

This provides the infrastructure for schedulers to expose their internal
state through debugfs. We add a list of queue attributes and a list of
hctx attributes to struct elevator_type and wire them up when switching
schedulers.

Signed-off-by: Omar Sandoval 
Reviewed-by: Hannes Reinecke 

Add missing seq_file.h header in blk-mq-debugfs.h

Signed-off-by: Jens Axboe

blk-mq: untangle debugfs and sysfs

2017-05-04T14:24:13+00:00

Originally, I tied debugfs registration/unregistration together with
sysfs. There's no reason to do this, and it's getting in the way of
letting schedulers define their own debugfs attributes. Instead, tie the
debugfs registration to the lifetime of the structures themselves.

The saner lifetimes mean we can also get rid of the extra mq directory
and move everything one level up. I.e., nvme0n1/mq/hctx0/tags is now
just nvme0n1/hctx0/tags.

Signed-off-by: Omar Sandoval 
Signed-off-by: Jens Axboe

blk-mq: update ->init_request and ->exit_request prototypes

2017-05-02T13:52:08+00:00

Remove the request_idx parameter, which can't be used safely now that we
support I/O schedulers with blk-mq.  Except for a superflous check in
mtip32xx it was unused anyway.

Also pass the tag_set instead of just the driver data - this allows drivers
to avoid some code duplication in a follow on cleanup.

Signed-off-by: Christoph Hellwig 
Signed-off-by: Jens Axboe

blk-mq: unify hctx delay_work and run_work

2017-04-28T14:11:43+00:00

The only difference between ->run_work and ->delay_work, is that
the latter is used to defer running a queue. This is done by
marking the queue stopped, and scheduling ->delay_work to run
sometime in the future. While the queue is stopped, direct runs
or runs through ->run_work will not run the queue.

If we combine the handlers, then we need to handle two things:

1) If a delayed/stopped run is scheduled, then we should not run
   the queue before that has been completed.
2) If a queue is delayed/stopped, the handler needs to restart
   the queue. Normally a run of a queue with the stopped bit set
   would be a no-op.

Case 1 is handled by modifying a currently pending queue run
to the deadline set by the caller of blk_mq_delay_queue().
Subsequent attempts to queue a queue run will find the work
item already pending, and direct runs will see a stopped queue
as before.

Case 2 is handled by adding a new bit, BLK_MQ_S_START_ON_RUN,
that tells the work handler that it should clear a stopped
queue and run the handler.

Reviewed-by: Bart Van Assche 
Signed-off-by: Jens Axboe

blk-mq: unify hctx delayed_run_work and run_work

2017-04-28T14:10:15+00:00

They serve the exact same purpose. Get rid of the non-delayed
work variant, and just run it without delay for the normal case.

Reviewed-by: Christoph Hellwig 
Reviewed-by: Bart Van Assche 
Reviewed-by: Ming Lei 
Signed-off-by: Jens Axboe

blk-mq: Add blk_mq_ops.show_rq()

2017-04-26T21:09:04+00:00

This new callback function will be used in the next patch to show
more information about SCSI requests.

Signed-off-by: Bart Van Assche 
Reviewed-by: Omar Sandoval 
Cc: Hannes Reinecke 
Signed-off-by: Jens Axboe

blk-mq: remove the error argument to blk_mq_complete_request

2017-04-20T18:16:10+00:00

Now that all drivers that call blk_mq_complete_requests have a
->complete callback we can remove the direct call to blk_mq_end_request,
as well as the error argument to blk_mq_complete_request.

Signed-off-by: Christoph Hellwig 
Reviewed-by: Johannes Thumshirn 
Reviewed-by: Bart Van Assche 
Signed-off-by: Jens Axboe

blk-mq: export helpers

2017-04-14T20:06:55+00:00

blk_mq_finish_request() is required for schedulers that define their own
put_request(). blk_mq_run_hw_queue() is required for schedulers that
hold back requests to be run later.

Signed-off-by: Omar Sandoval 
Signed-off-by: Jens Axboe

Merge branch 'for-linus' into for-4.12/block

2017-04-07T18:45:20+00:00

We've added a considerable amount of fixes for stalls and issues
with the blk-mq scheduling in the 4.11 series since forking
off the for-4.12/block branch. We need to do improvements on
top of that for 4.12, so pull in the previous fixes to make
our lives easier going forward.

Signed-off-by: Jens Axboe