public inbox for [email protected]
 help / color / mirror / Atom feed
From: Jeffle Xu <[email protected]>
To: [email protected]
Cc: [email protected], [email protected],
	[email protected]
Subject: [PATCH RFC 7/7] dm: add support for IO polling
Date: Wed, 23 Dec 2020 19:26:24 +0800	[thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>

Enable iopoll when all underlying target devices supports iopoll.

Signed-off-by: Jeffle Xu <[email protected]>
---
 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,
-- 
2.27.0


  parent reply	other threads:[~2020-12-23 11:27 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-23 11:26 [PATCH RFC 0/7] dm: add support of iopoll Jeffle Xu
2020-12-23 11:26 ` [PATCH RFC 1/7] block: move definition of blk_qc_t to types.h Jeffle Xu
2021-01-07 19:04   ` Mike Snitzer
2020-12-23 11:26 ` [PATCH RFC 2/7] block: add helper function fetching gendisk from queue Jeffle Xu
2021-01-07 20:31   ` Mike Snitzer
2020-12-23 11:26 ` [PATCH RFC 3/7] block: add iopoll method for non-mq device Jeffle Xu
2021-01-07 21:47   ` Mike Snitzer
2021-01-08  3:24     ` [dm-devel] " JeffleXu
2021-01-08 17:33       ` Mike Snitzer
2021-01-11  7:50         ` [dm-devel] " JeffleXu
2020-12-23 11:26 ` [PATCH RFC 4/7] block: define blk_qc_t as uintptr_t Jeffle Xu
2021-01-07 21:52   ` Mike Snitzer
2020-12-23 11:26 ` [PATCH RFC 5/7] dm: always return BLK_QC_T_NONE for bio-based device Jeffle Xu
2021-01-07 21:54   ` Mike Snitzer
2020-12-23 11:26 ` [PATCH RFC 6/7] block: track cookies of split bios " Jeffle Xu
2021-01-07 22:18   ` Mike Snitzer
2021-01-08  3:08     ` [dm-devel] " JeffleXu
2021-01-08 17:26       ` Mike Snitzer
2021-01-12  5:46         ` [dm-devel] " JeffleXu
2021-01-12 16:13           ` Mike Snitzer
2021-01-14  9:16             ` [dm-devel] " JeffleXu
2021-01-14 14:30               ` Mike Snitzer
2021-01-12  7:11         ` [dm-devel] " JeffleXu
2020-12-23 11:26 ` Jeffle Xu [this message]
2021-01-08  3:12   ` [dm-devel] [PATCH RFC 7/7] dm: add support for IO polling JeffleXu
2021-01-07  1:14 ` [dm-devel] [PATCH RFC 0/7] dm: add support of iopoll JeffleXu

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    [email protected] \
    [email protected] \
    [email protected] \
    [email protected] \
    [email protected] \
    [email protected] \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox