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| author |   John Garry <john.garry@huawei.com> | 2020-08-19 23:20:29 +0800 |
|---|---|---|
| committer |   Jens Axboe <axboe@kernel.dk> | 2020-09-24 13:44:44 -0600 |
| commit | 0905053bdb5b7ba77ad0c2e5cfc4787c1db3d4f1 (patch) | |
| tree | ddf72968cef47093e34939955d1276ca5b290458 | |
| parent | Merge branch 'for-5.10/block' into for-5.10/drivers (diff) | |
| download | linux-dev-0905053bdb5b7ba77ad0c2e5cfc4787c1db3d4f1.tar.xz linux-dev-0905053bdb5b7ba77ad0c2e5cfc4787c1db3d4f1.zip | |
null_blk: Support shared tag bitmap
Support a shared tag bitmap, whereby request tags are unique over all
submission queues, and not just per submission queue.
As such, per device total queue depth is normally hw_queue_depth *
submit_queues, but hw_queue_depth when set. And a similar story for when
shared_tags is set, where that is the queue depth over all null blk
devices.
Signed-off-by: John Garry <john.garry@huawei.com>
Tested-by: Douglas Gilbert <dgilbert@interlog.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
| -rw-r--r-- | drivers/block/null_blk_main.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/block/null_blk_main.c b/drivers/block/null_blk_main.c index d74443a9c8fa..55d2ef92be47 100644 --- a/drivers/block/null_blk_main.c +++ b/drivers/block/null_blk_main.c @@ -164,6 +164,10 @@ static bool shared_tags; module_param(shared_tags, bool, 0444); MODULE_PARM_DESC(shared_tags, "Share tag set between devices for blk-mq"); +static bool g_shared_tag_bitmap; +module_param_named(shared_tag_bitmap, g_shared_tag_bitmap, bool, 0444); +MODULE_PARM_DESC(shared_tag_bitmap, "Use shared tag bitmap for all submission queues for blk-mq"); + static int g_irqmode = NULL_IRQ_SOFTIRQ; static int null_set_irqmode(const char *str, const struct kernel_param *kp) @@ -1692,6 +1696,8 @@ static int null_init_tag_set(struct nullb *nullb, struct blk_mq_tag_set *set) set->flags = BLK_MQ_F_SHOULD_MERGE; if (g_no_sched) set->flags |= BLK_MQ_F_NO_SCHED; + if (g_shared_tag_bitmap) + set->flags |= BLK_MQ_F_TAG_HCTX_SHARED; set->driver_data = NULL; if ((nullb && nullb->dev->blocking) || g_blocking) |