linux-toradex.git/include/linux/blk-mq.h, branch v5.1-rc4

block: Unexport blk_mq_add_to_requeue_list()

2019-03-20T20:19:36+00:00

This function is not used outside the block layer core. Hence unexport it.

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

blk-mq: remove unused 'nr_expired' from blk_mq_hw_ctx

2019-03-19T15:04:06+00:00

There is no usage of 'nr_expired'.

The 'nr_expired' was introduced by commit 1d9bd5161ba3 ("blk-mq: replace
timeout synchronization with a RCU and generation based scheme"). Its usage
was removed since commit 12f5b9314545 ("blk-mq: Remove generation
seqeunce").

Signed-off-by: Dongli Zhang 
Signed-off-by: Jens Axboe

block: kill BLK_MQ_F_SG_MERGE

2019-02-15T15:40:12+00:00

QUEUE_FLAG_NO_SG_MERGE has been killed, so kill BLK_MQ_F_SG_MERGE too.

Reviewed-by: Christoph Hellwig 
Reviewed-by: Omar Sandoval 
Signed-off-by: Ming Lei 
Signed-off-by: Jens Axboe

block: make request_to_qc_t public

2018-12-18T16:50:47+00:00

block consumers will need it for polling requests that
are sent with blk_execute_rq_nowait. Also, get rid of
blk_tag_to_qc_t and open-code it instead.

Reviewed-by: Jens Axboe 
Signed-off-by: Sagi Grimberg 
Signed-off-by: Christoph Hellwig

blk-mq: change blk_mq_queue_busy() to blk_mq_queue_inflight()

2018-12-18T04:31:42+00:00

There's a single user of this function, dm, and dm just wants
to check if IO is inflight, not that it's just allocated.

This fixes a hang with srp/002 in blktests with dm, where it tries
to suspend but waits for inflight IO to finish first. As it checks
for just allocated requests, this fails.

Tested-by: Mike Snitzer 
Signed-off-by: Jens Axboe

block: move queues types to the block layer

2018-12-04T18:38:17+00:00

Having another indirect all in the fast path doesn't really help
in our post-spectre world.  Also having too many queue type is just
going to create confusion, so I'd rather manage them centrally.

Note that the queue type naming and ordering changes a bit - the
first index now is the default queue for everything not explicitly
marked, the optional ones are read and poll queues.

Reviewed-by: Sagi Grimberg 
Signed-off-by: Christoph Hellwig 
Signed-off-by: Jens Axboe

blk-mq: add mq_ops->commit_rqs()

2018-11-29T17:11:56+00:00

blk-mq passes information to the hardware about any given request being
the last that we will issue in this sequence. The point is that hardware
can defer costly doorbell type writes to the last request. But if we run
into errors issuing a sequence of requests, we may never send the request
with bd->last == true set. For that case, we need a hook that tells the
hardware that nothing else is coming right now.

For failures returned by the drivers ->queue_rq() hook, the driver is
responsible for flushing pending requests, if it uses bd->last to
optimize that part. This works like before, no changes there.

Reviewed-by: Omar Sandoval 
Reviewed-by: Ming Lei 
Reviewed-by: Christoph Hellwig 
Signed-off-by: Jens Axboe

blk-mq: Simplify request completion state

2018-11-26T17:34:27+00:00

There are no more users relying on blk-mq request states to prevent
double completions, so replace the relatively expensive cmpxchg operation
with WRITE_ONCE.

Reviewed-by: Christoph Hellwig 
Signed-off-by: Keith Busch 
Signed-off-by: Jens Axboe

blk-mq: Return true if request was completed

2018-11-26T17:34:24+00:00

A driver may have internal state to cleanup if we're pretending a request
didn't complete. Return 'false' if the command wasn't actually completed
due to the timeout error injection, and true otherwise.

Reviewed-by: Christoph Hellwig 
Signed-off-by: Keith Busch 
Signed-off-by: Jens Axboe

blk-mq: remove 'tag' parameter from mq_ops->poll()

2018-11-26T15:25:44+00:00

We always pass in -1 now and none of the callers use the tag value,
remove the parameter.

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