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Custom Display Name List=false; Reply-to Address Mismatch=false; Targeted Threat Dictionary=false; Mimecast Threat Dictionary=false; Custom Threat Dictionary=false X-Scanned-By: MIMEDefang 2.78 on 10.11.54.3 X-loop: dm-devel@redhat.com X-Mailman-Approved-At: Mon, 04 Jan 2021 14:03:12 -0500 Cc: linux-block@vger.kernel.org, dm-devel@redhat.com, io-uring@vger.kernel.org Subject: [dm-devel] [PATCH RFC 7/7] dm: add support for IO polling X-BeenThere: dm-devel@redhat.com X-Mailman-Version: 2.1.12 Precedence: junk List-Id: device-mapper development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=dm-devel-bounces@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Enable iopoll when all underlying target devices supports iopoll. Signed-off-by: Jeffle Xu --- drivers/md/dm-table.c | 28 ++++++++++++++++++++++++++++ drivers/md/dm.c | 1 + 2 files changed, 29 insertions(+) diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c index 188f41287f18..b0cd5bf58c3c 100644 --- a/drivers/md/dm-table.c +++ b/drivers/md/dm-table.c @@ -1791,6 +1791,31 @@ static bool dm_table_requires_stable_pages(struct dm_table *t) return false; } +static int device_supports_poll(struct dm_target *ti, struct dm_dev *dev, + sector_t start, sector_t len, void *data) +{ + struct request_queue *q = bdev_get_queue(dev->bdev); + + return q && test_bit(QUEUE_FLAG_POLL, &q->queue_flags); +} + +static bool dm_table_supports_poll(struct dm_table *t) +{ + struct dm_target *ti; + unsigned int i; + + /* Ensure that all targets support iopoll. */ + for (i = 0; i < dm_table_get_num_targets(t); i++) { + ti = dm_table_get_target(t, i); + + if (!ti->type->iterate_devices || + !ti->type->iterate_devices(ti, device_supports_poll, NULL)) + return false; + } + + return true; +} + void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q, struct queue_limits *limits) { @@ -1883,6 +1908,9 @@ void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q, #endif blk_queue_update_readahead(q); + + if (dm_table_supports_poll(t)) + blk_queue_flag_set(QUEUE_FLAG_POLL, q); } unsigned int dm_table_get_num_targets(struct dm_table *t) diff --git a/drivers/md/dm.c b/drivers/md/dm.c index 03c2b867acaa..ffd2c5ead256 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -3049,6 +3049,7 @@ static const struct pr_ops dm_pr_ops = { }; static const struct block_device_operations dm_blk_dops = { + .iopoll = blk_bio_poll, .submit_bio = dm_submit_bio, .open = dm_blk_open, .release = dm_blk_close,