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Message-ID: <1481228005-9245-8-git-send-email-axboe@fb.com>
Date: Thu, 8 Dec 2016 13:13:25 -0700
From: Jens Axboe <axboe@...com>
To: <axboe@...nel.dk>, <linux-block@...r.kernel.org>,
<linux-kernel@...r.kernel.org>
CC: <paolo.valente@...aro.org>, <osandov@...com>,
Jens Axboe <axboe@...com>
Subject: [PATCH 7/7] blk-mq-sched: allow setting of default IO scheduler
Signed-off-by: Jens Axboe <axboe@...com>
---
block/Kconfig.iosched | 43 +++++++++++++++++++++++++++++++++++++------
block/blk-mq-sched.c | 19 +++++++++++++++++++
block/blk-mq-sched.h | 1 +
block/blk-mq.c | 3 +++
block/elevator.c | 5 ++++-
drivers/nvme/host/pci.c | 1 +
include/linux/blk-mq.h | 1 +
7 files changed, 66 insertions(+), 7 deletions(-)
diff --git a/block/Kconfig.iosched b/block/Kconfig.iosched
index 490ef2850fae..00502a3d76b7 100644
--- a/block/Kconfig.iosched
+++ b/block/Kconfig.iosched
@@ -32,12 +32,6 @@ config IOSCHED_CFQ
This is the default I/O scheduler.
-config MQ_IOSCHED_DEADLINE
- tristate "MQ deadline I/O scheduler"
- default y
- ---help---
- MQ version of the deadline IO scheduler.
-
config CFQ_GROUP_IOSCHED
bool "CFQ Group Scheduling support"
depends on IOSCHED_CFQ && BLK_CGROUP
@@ -69,6 +63,43 @@ config DEFAULT_IOSCHED
default "cfq" if DEFAULT_CFQ
default "noop" if DEFAULT_NOOP
+config MQ_IOSCHED_DEADLINE
+ tristate "MQ deadline I/O scheduler"
+ default y
+ ---help---
+ MQ version of the deadline IO scheduler.
+
+config MQ_IOSCHED_NONE
+ bool
+ default y
+
+choice
+ prompt "Default MQ I/O scheduler"
+ default MQ_IOSCHED_NONE
+ help
+ Select the I/O scheduler which will be used by default for all
+ blk-mq managed block devices.
+
+ config DEFAULT_MQ_DEADLINE
+ bool "MQ Deadline" if MQ_IOSCHED_DEADLINE=y
+
+ config DEFAULT_MQ_NONE
+ bool "None"
+
+endchoice
+
+config DEFAULT_MQ_IOSCHED
+ string
+ default "mq-deadline" if DEFAULT_MQ_DEADLINE
+ default "none" if DEFAULT_MQ_NONE
+
endmenu
+config MQ_IOSCHED_ONLY_SQ
+ bool "Enable blk-mq IO scheduler only for single queue devices"
+ default y
+ help
+ Say Y here, if you only want to enable IO scheduling on block
+ devices that have a single queue registered.
+
endif
diff --git a/block/blk-mq-sched.c b/block/blk-mq-sched.c
index 9213366e67d1..bcab84d325c2 100644
--- a/block/blk-mq-sched.c
+++ b/block/blk-mq-sched.c
@@ -244,3 +244,22 @@ void __blk_mq_sched_dispatch_requests(struct blk_mq_hw_ctx *hctx)
blk_mq_dispatch_rq_list(hctx, &rq_list);
}
+
+int blk_mq_sched_init(struct request_queue *q)
+{
+ int ret;
+
+#if defined(CONFIG_DEFAULT_MQ_NONE)
+ return 0;
+#endif
+#if defined(CONFIG_MQ_IOSCHED_ONLY_SQ)
+ if (q->nr_hw_queues > 1)
+ return 0;
+#endif
+
+ mutex_lock(&q->sysfs_lock);
+ ret = elevator_init(q, NULL);
+ mutex_unlock(&q->sysfs_lock);
+
+ return ret;
+}
diff --git a/block/blk-mq-sched.h b/block/blk-mq-sched.h
index 609c80506cfc..391ecc00f520 100644
--- a/block/blk-mq-sched.h
+++ b/block/blk-mq-sched.h
@@ -25,6 +25,7 @@ struct request *
blk_mq_sched_request_from_shadow(struct blk_mq_hw_ctx *hctx,
struct request *(*get_sched_rq)(struct blk_mq_hw_ctx *));
+int blk_mq_sched_init(struct request_queue *q);
struct blk_mq_alloc_data {
/* input parameter */
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 019de6f0fd06..9eeffd76f729 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -2141,6 +2141,9 @@ struct request_queue *blk_mq_init_allocated_queue(struct blk_mq_tag_set *set,
INIT_LIST_HEAD(&q->requeue_list);
spin_lock_init(&q->requeue_lock);
+ if (!(set->flags & BLK_MQ_F_NO_SCHED))
+ blk_mq_sched_init(q);
+
if (q->nr_hw_queues > 1)
blk_queue_make_request(q, blk_mq_make_request);
else
diff --git a/block/elevator.c b/block/elevator.c
index f1191b3b0ff3..368976d05f0a 100644
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -219,7 +219,10 @@ int elevator_init(struct request_queue *q, char *name)
}
if (!e) {
- e = elevator_get(CONFIG_DEFAULT_IOSCHED, false);
+ if (q->mq_ops)
+ e = elevator_get(CONFIG_DEFAULT_MQ_IOSCHED, false);
+ else
+ e = elevator_get(CONFIG_DEFAULT_IOSCHED, false);
if (!e) {
printk(KERN_ERR
"Default I/O scheduler not found. " \
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 82b9b3f1f21d..7777ec58252f 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -1186,6 +1186,7 @@ static int nvme_alloc_admin_tags(struct nvme_dev *dev)
dev->admin_tagset.timeout = ADMIN_TIMEOUT;
dev->admin_tagset.numa_node = dev_to_node(dev->dev);
dev->admin_tagset.cmd_size = nvme_cmd_size(dev);
+ dev->admin_tagset.flags = BLK_MQ_F_NO_SCHED;
dev->admin_tagset.driver_data = dev;
if (blk_mq_alloc_tag_set(&dev->admin_tagset))
diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index c86b314dde97..7c470bf4d7bf 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -152,6 +152,7 @@ enum {
BLK_MQ_F_SG_MERGE = 1 << 2,
BLK_MQ_F_DEFER_ISSUE = 1 << 4,
BLK_MQ_F_BLOCKING = 1 << 5,
+ BLK_MQ_F_NO_SCHED = 1 << 6,
BLK_MQ_F_ALLOC_POLICY_START_BIT = 8,
BLK_MQ_F_ALLOC_POLICY_BITS = 1,
--
2.7.4
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