kernel/include/linux/blk-mq.h, branch linux-3.17.y

blk-mq: get rid of unused BLK_MQ_F_SHOULD_SORT flag

2014-08-15T18:38:41Z

We used to use this for determining whether to sort the dispatch list, but it's unused now. Signed-off-by: Jens Axboe

blk-mq: bitmap tag: fix races on shared ::wake_index fields

2014-06-18T05:12:35Z

Fix racy updates of shared blk_mq_bitmap_tags::wake_index and blk_mq_hw_ctx::wake_index fields. Cc: Ming Lei Signed-off-by: Alexander Gordeev Signed-off-by: Jens Axboe

blk-mq: bump max tag depth to 10K tags

2014-06-06T14:04:46Z

For some scsi-mq cases, the tag map can be huge. So increase the max number of tags we support. Additionally, don't fail with EINVAL if a user requests too many tags. Warn that the tag depth has been adjusted down, and store the new value inside the tag_set passed in. Signed-off-by: Jens Axboe

blk-mq: let blk_mq_tag_to_rq() take blk_mq_tags as the main parameter

2014-06-04T16:23:49Z

We currently pass in the hardware queue, and get the tags from there. But from scsi-mq, with a shared tag space, it's a lot more convenient to pass in the blk_mq_tags instead as the hardware queue isn't always directly available. So instead of having to re-map to a given hardware queue from rq->mq_ctx, just pass in the tags structure. Signed-off-by: Jens Axboe

blk-mq: make the sysfs mq/ layout reflect current mappings

2014-05-30T14:25:36Z

Currently blk-mq registers all the hardware queues in sysfs, regardless of whether it uses them (e.g. they have CPU mappings) or not. The unused hardware queues lack the cpux/ directories, and the other sysfs entries (like active, pending, etc) are all zeroes. Change this so that sysfs correctly reflects the current mappings of the hardware queues. Signed-off-by: Jens Axboe

blk-mq: blk_mq_tag_to_rq should handle flush request

2014-05-30T14:06:42Z

flush request is special, which borrows the tag from the parent request. Hence blk_mq_tag_to_rq needs special handling to return the flush request from the tag. Signed-off-by: Shaohua Li Signed-off-by: Jens Axboe

block: add queue flag for disabling SG merging

2014-05-29T15:53:32Z

If devices are not SG starved, we waste a lot of time potentially collapsing SG segments. Enough that 1.5% of the CPU time goes to this, at only 400K IOPS. Add a queue flag, QUEUE_FLAG_NO_SG_MERGE, which just returns the number of vectors in a bio instead of looping over all segments and checking for collapsible ones. Add a BLK_MQ_F_SG_MERGE flag so that drivers can opt-in on the sg merging, if they so desire. Signed-off-by: Jens Axboe

blk-mq: remove alloc_hctx and free_hctx methods

2014-05-28T16:18:31Z

There is no need for drivers to control hardware context allocation now that we do the context to node mapping in common code. Signed-off-by: Christoph Hellwig Signed-off-by: Jens Axboe

blk-mq: merge blk_mq_alloc_reserved_request into blk_mq_alloc_request

2014-05-28T15:49:19Z

Instead of having two almost identical copies of the same code just let the callers pass in the reserved flag directly. Signed-off-by: Christoph Hellwig Signed-off-by: Jens Axboe

blk-mq: add helper to insert requests from irq context

2014-05-28T14:08:02Z

Both the cache flush state machine and the SCSI midlayer want to submit requests from irq context, and the current per-request requeue_work unfortunately causes corruption due to sharing with the csd field for flushes. Replace them with a per-request_queue list of requests to be requeued. Based on an earlier test by Ming Lei. Signed-off-by: Christoph Hellwig Reported-by: Ming Lei Tested-by: Ming Lei Signed-off-by: Jens Axboe