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blk-mq-sched: provide hooks for initializing hardware queue data

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Schedulers need to be informed when a hardware queue is added or removed
at runtime so they can allocate/free per-hardware queue data. So,
replace the blk_mq_sched_init_hctx_data() helper, which only makes sense
at init time, with .init_hctx() and .exit_hctx() hooks.

Signed-off-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Omar Sandoval 2017-04-05 12:01:34 -07:00 committed by Jens Axboe
parent 65f619d253
commit ee056f9812
3 changed files with 45 additions and 42 deletions
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81
block/blk-mq-sched.c
View File

@ -30,43 +30,6 @@ void blk_mq_sched_free_hctx_data(struct request_queue *q,
}
EXPORT_SYMBOL_GPL(blk_mq_sched_free_hctx_data);
int blk_mq_sched_init_hctx_data(struct request_queue *q, size_t size,
int (*init)(struct blk_mq_hw_ctx *),
void (*exit)(struct blk_mq_hw_ctx *))
{
struct blk_mq_hw_ctx *hctx;
int ret;
int i;
queue_for_each_hw_ctx(q, hctx, i) {
hctx->sched_data = kmalloc_node(size, GFP_KERNEL, hctx->numa_node);
if (!hctx->sched_data) {
ret = -ENOMEM;
goto error;
}
if (init) {
ret = init(hctx);
if (ret) {
/*
* We don't want to give exit() a partially
* initialized sched_data. init() must clean up
* if it fails.
*/
kfree(hctx->sched_data);
hctx->sched_data = NULL;
goto error;
}
}
}
return 0;
error:
blk_mq_sched_free_hctx_data(q, exit);
return ret;
}
EXPORT_SYMBOL_GPL(blk_mq_sched_init_hctx_data);
static void __blk_mq_sched_assign_ioc(struct request_queue *q,
struct request *rq,
struct bio *bio,
@ -508,11 +471,24 @@ int blk_mq_sched_init_hctx(struct request_queue *q, struct blk_mq_hw_ctx *hctx,
unsigned int hctx_idx)
{
struct elevator_queue *e = q->elevator;
int ret;
if (!e)
return 0;
return blk_mq_sched_alloc_tags(q, hctx, hctx_idx);
ret = blk_mq_sched_alloc_tags(q, hctx, hctx_idx);
if (ret)
return ret;
if (e->type->ops.mq.init_hctx) {
ret = e->type->ops.mq.init_hctx(hctx, hctx_idx);
if (ret) {
blk_mq_sched_free_tags(q->tag_set, hctx, hctx_idx);
return ret;
}
}
return 0;
}
void blk_mq_sched_exit_hctx(struct request_queue *q, struct blk_mq_hw_ctx *hctx,
@ -523,12 +499,18 @@ void blk_mq_sched_exit_hctx(struct request_queue *q, struct blk_mq_hw_ctx *hctx,
if (!e)
return;
if (e->type->ops.mq.exit_hctx && hctx->sched_data) {
e->type->ops.mq.exit_hctx(hctx, hctx_idx);
hctx->sched_data = NULL;
}
blk_mq_sched_free_tags(q->tag_set, hctx, hctx_idx);
}
int blk_mq_init_sched(struct request_queue *q, struct elevator_type *e)
{
struct blk_mq_hw_ctx *hctx;
struct elevator_queue *eq;
unsigned int i;
int ret;
@ -553,6 +535,18 @@ int blk_mq_init_sched(struct request_queue *q, struct elevator_type *e)
if (ret)
goto err;
if (e->ops.mq.init_hctx) {
queue_for_each_hw_ctx(q, hctx, i) {
ret = e->ops.mq.init_hctx(hctx, i);
if (ret) {
eq = q->elevator;
blk_mq_exit_sched(q, eq);
kobject_put(&eq->kobj);
return ret;
}
}
}
return 0;
err:
@ -563,6 +557,17 @@ err:
void blk_mq_exit_sched(struct request_queue *q, struct elevator_queue *e)
{
struct blk_mq_hw_ctx *hctx;
unsigned int i;
if (e->type->ops.mq.exit_hctx) {
queue_for_each_hw_ctx(q, hctx, i) {
if (hctx->sched_data) {
e->type->ops.mq.exit_hctx(hctx, i);
hctx->sched_data = NULL;
}
}
}
if (e->type->ops.mq.exit_sched)
e->type->ops.mq.exit_sched(e);
blk_mq_sched_tags_teardown(q);

4
block/blk-mq-sched.h
View File

@ -4,10 +4,6 @@
#include "blk-mq.h"
#include "blk-mq-tag.h"
int blk_mq_sched_init_hctx_data(struct request_queue *q, size_t size,
int (*init)(struct blk_mq_hw_ctx *),
void (*exit)(struct blk_mq_hw_ctx *));
void blk_mq_sched_free_hctx_data(struct request_queue *q,
void (*exit)(struct blk_mq_hw_ctx *));

2
include/linux/elevator.h
View File

@ -93,6 +93,8 @@ struct blk_mq_hw_ctx;
struct elevator_mq_ops {
int (*init_sched)(struct request_queue *, struct elevator_type *);
void (*exit_sched)(struct elevator_queue *);
int (*init_hctx)(struct blk_mq_hw_ctx *, unsigned int);
void (*exit_hctx)(struct blk_mq_hw_ctx *, unsigned int);
bool (*allow_merge)(struct request_queue *, struct request *, struct bio *);
bool (*bio_merge)(struct blk_mq_hw_ctx *, struct bio *);