block: remove legacy rq tagging
It's now unused, kill it. Reviewed-by: Hannes Reinecke <hare@suse.com> Tested-by: Ming Lei <ming.lei@redhat.com> Reviewed-by: Omar Sandoval <osandov@fb.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe
parent
2cdf2caecd
commit
7ca0192646
@ -65,7 +65,6 @@ Description of Contents:
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3.2.3 I/O completion
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3.2.4 Implications for drivers that do not interpret bios (don't handle
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multiple segments)
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3.2.5 Request command tagging
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3.3 I/O submission
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4. The I/O scheduler
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5. Scalability related changes
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@ -708,93 +707,6 @@ is crossed on completion of a transfer. (The end*request* functions should
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be used if only if the request has come down from block/bio path, not for
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direct access requests which only specify rq->buffer without a valid rq->bio)
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3.2.5 Generic request command tagging
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3.2.5.1 Tag helpers
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Block now offers some simple generic functionality to help support command
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queueing (typically known as tagged command queueing), ie manage more than
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one outstanding command on a queue at any given time.
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blk_queue_init_tags(struct request_queue *q, int depth)
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Initialize internal command tagging structures for a maximum
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depth of 'depth'.
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blk_queue_free_tags((struct request_queue *q)
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Teardown tag info associated with the queue. This will be done
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automatically by block if blk_queue_cleanup() is called on a queue
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that is using tagging.
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The above are initialization and exit management, the main helpers during
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normal operations are:
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blk_queue_start_tag(struct request_queue *q, struct request *rq)
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Start tagged operation for this request. A free tag number between
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0 and 'depth' is assigned to the request (rq->tag holds this number),
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and 'rq' is added to the internal tag management. If the maximum depth
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for this queue is already achieved (or if the tag wasn't started for
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some other reason), 1 is returned. Otherwise 0 is returned.
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blk_queue_end_tag(struct request_queue *q, struct request *rq)
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End tagged operation on this request. 'rq' is removed from the internal
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book keeping structures.
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To minimize struct request and queue overhead, the tag helpers utilize some
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of the same request members that are used for normal request queue management.
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This means that a request cannot both be an active tag and be on the queue
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list at the same time. blk_queue_start_tag() will remove the request, but
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the driver must remember to call blk_queue_end_tag() before signalling
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completion of the request to the block layer. This means ending tag
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operations before calling end_that_request_last()! For an example of a user
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of these helpers, see the IDE tagged command queueing support.
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3.2.5.2 Tag info
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Some block functions exist to query current tag status or to go from a
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tag number to the associated request. These are, in no particular order:
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blk_queue_tagged(q)
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Returns 1 if the queue 'q' is using tagging, 0 if not.
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blk_queue_tag_request(q, tag)
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Returns a pointer to the request associated with tag 'tag'.
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blk_queue_tag_depth(q)
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Return current queue depth.
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blk_queue_tag_queue(q)
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Returns 1 if the queue can accept a new queued command, 0 if we are
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at the maximum depth already.
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blk_queue_rq_tagged(rq)
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Returns 1 if the request 'rq' is tagged.
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3.2.5.2 Internal structure
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Internally, block manages tags in the blk_queue_tag structure:
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struct blk_queue_tag {
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struct request **tag_index; /* array or pointers to rq */
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unsigned long *tag_map; /* bitmap of free tags */
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struct list_head busy_list; /* fifo list of busy tags */
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int busy; /* queue depth */
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int max_depth; /* max queue depth */
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};
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Most of the above is simple and straight forward, however busy_list may need
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a bit of explaining. Normally we don't care too much about request ordering,
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but in the event of any barrier requests in the tag queue we need to ensure
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that requests are restarted in the order they were queue.
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3.3 I/O Submission
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The routine submit_bio() is used to submit a single io. Higher level i/o
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@ -3,7 +3,7 @@
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# Makefile for the kernel block layer
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#
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obj-$(CONFIG_BLOCK) := bio.o elevator.o blk-core.o blk-tag.o blk-sysfs.o \
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obj-$(CONFIG_BLOCK) := bio.o elevator.o blk-core.o blk-sysfs.o \
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blk-flush.o blk-settings.o blk-ioc.o blk-map.o \
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blk-exec.o blk-merge.o blk-softirq.o blk-timeout.o \
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blk-lib.o blk-mq.o blk-mq-tag.o blk-stat.o \
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@ -1658,9 +1658,6 @@ void blk_requeue_request(struct request_queue *q, struct request *rq)
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trace_block_rq_requeue(q, rq);
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rq_qos_requeue(q, rq);
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if (rq->rq_flags & RQF_QUEUED)
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blk_queue_end_tag(q, rq);
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BUG_ON(blk_queued_rq(rq));
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elv_requeue_request(q, rq);
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@ -3174,9 +3171,6 @@ void blk_finish_request(struct request *req, blk_status_t error)
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if (req->rq_flags & RQF_STATS)
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blk_stat_add(req, now);
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if (req->rq_flags & RQF_QUEUED)
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blk_queue_end_tag(q, req);
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BUG_ON(blk_queued_rq(req));
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if (unlikely(laptop_mode) && !blk_rq_is_passthrough(req))
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@ -112,7 +112,6 @@ static int queue_pm_only_show(void *data, struct seq_file *m)
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#define QUEUE_FLAG_NAME(name) [QUEUE_FLAG_##name] = #name
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static const char *const blk_queue_flag_name[] = {
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QUEUE_FLAG_NAME(QUEUED),
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QUEUE_FLAG_NAME(STOPPED),
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QUEUE_FLAG_NAME(DYING),
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QUEUE_FLAG_NAME(BYPASS),
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@ -318,7 +317,6 @@ static const char *const cmd_flag_name[] = {
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static const char *const rqf_name[] = {
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RQF_NAME(SORTED),
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RQF_NAME(STARTED),
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RQF_NAME(QUEUED),
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RQF_NAME(SOFTBARRIER),
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RQF_NAME(FLUSH_SEQ),
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RQF_NAME(MIXED_MERGE),
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@ -530,10 +530,8 @@ u32 blk_mq_unique_tag(struct request *rq)
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struct blk_mq_hw_ctx *hctx;
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int hwq = 0;
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if (q->mq_ops) {
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hctx = blk_mq_map_queue(q, rq->mq_ctx->cpu);
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hwq = hctx->queue_num;
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}
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hctx = blk_mq_map_queue(q, rq->mq_ctx->cpu);
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hwq = hctx->queue_num;
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return (hwq << BLK_MQ_UNIQUE_TAG_BITS) |
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(rq->tag & BLK_MQ_UNIQUE_TAG_MASK);
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@ -849,9 +849,6 @@ static void __blk_release_queue(struct work_struct *work)
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blk_exit_rl(q, &q->root_rl);
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if (q->queue_tags)
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__blk_queue_free_tags(q);
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blk_queue_free_zone_bitmaps(q);
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if (!q->mq_ops) {
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378
block/blk-tag.c
378
block/blk-tag.c
@ -1,378 +0,0 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Functions related to tagged command queuing
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/bio.h>
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#include <linux/blkdev.h>
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#include <linux/slab.h>
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#include "blk.h"
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/**
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* blk_queue_find_tag - find a request by its tag and queue
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* @q: The request queue for the device
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* @tag: The tag of the request
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*
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* Notes:
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* Should be used when a device returns a tag and you want to match
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* it with a request.
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*
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* no locks need be held.
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**/
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struct request *blk_queue_find_tag(struct request_queue *q, int tag)
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{
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return blk_map_queue_find_tag(q->queue_tags, tag);
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}
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EXPORT_SYMBOL(blk_queue_find_tag);
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/**
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* blk_free_tags - release a given set of tag maintenance info
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* @bqt: the tag map to free
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*
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* Drop the reference count on @bqt and frees it when the last reference
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* is dropped.
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*/
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void blk_free_tags(struct blk_queue_tag *bqt)
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{
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if (atomic_dec_and_test(&bqt->refcnt)) {
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BUG_ON(find_first_bit(bqt->tag_map, bqt->max_depth) <
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bqt->max_depth);
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kfree(bqt->tag_index);
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bqt->tag_index = NULL;
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kfree(bqt->tag_map);
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bqt->tag_map = NULL;
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kfree(bqt);
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}
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}
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EXPORT_SYMBOL(blk_free_tags);
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/**
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* __blk_queue_free_tags - release tag maintenance info
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* @q: the request queue for the device
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*
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* Notes:
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* blk_cleanup_queue() will take care of calling this function, if tagging
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* has been used. So there's no need to call this directly.
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**/
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void __blk_queue_free_tags(struct request_queue *q)
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{
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struct blk_queue_tag *bqt = q->queue_tags;
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if (!bqt)
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return;
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blk_free_tags(bqt);
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q->queue_tags = NULL;
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queue_flag_clear_unlocked(QUEUE_FLAG_QUEUED, q);
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}
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/**
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* blk_queue_free_tags - release tag maintenance info
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* @q: the request queue for the device
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*
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* Notes:
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* This is used to disable tagged queuing to a device, yet leave
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* queue in function.
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**/
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void blk_queue_free_tags(struct request_queue *q)
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{
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queue_flag_clear_unlocked(QUEUE_FLAG_QUEUED, q);
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}
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EXPORT_SYMBOL(blk_queue_free_tags);
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static int
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init_tag_map(struct request_queue *q, struct blk_queue_tag *tags, int depth)
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{
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struct request **tag_index;
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unsigned long *tag_map;
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int nr_ulongs;
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if (q && depth > q->nr_requests * 2) {
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depth = q->nr_requests * 2;
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printk(KERN_ERR "%s: adjusted depth to %d\n",
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__func__, depth);
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}
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tag_index = kcalloc(depth, sizeof(struct request *), GFP_ATOMIC);
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if (!tag_index)
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goto fail;
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nr_ulongs = ALIGN(depth, BITS_PER_LONG) / BITS_PER_LONG;
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tag_map = kcalloc(nr_ulongs, sizeof(unsigned long), GFP_ATOMIC);
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if (!tag_map)
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goto fail;
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tags->real_max_depth = depth;
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tags->max_depth = depth;
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tags->tag_index = tag_index;
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tags->tag_map = tag_map;
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return 0;
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fail:
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kfree(tag_index);
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return -ENOMEM;
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}
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static struct blk_queue_tag *__blk_queue_init_tags(struct request_queue *q,
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int depth, int alloc_policy)
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{
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struct blk_queue_tag *tags;
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tags = kmalloc(sizeof(struct blk_queue_tag), GFP_ATOMIC);
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if (!tags)
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goto fail;
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if (init_tag_map(q, tags, depth))
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goto fail;
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atomic_set(&tags->refcnt, 1);
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tags->alloc_policy = alloc_policy;
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tags->next_tag = 0;
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return tags;
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fail:
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kfree(tags);
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return NULL;
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}
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/**
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* blk_init_tags - initialize the tag info for an external tag map
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* @depth: the maximum queue depth supported
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* @alloc_policy: tag allocation policy
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**/
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struct blk_queue_tag *blk_init_tags(int depth, int alloc_policy)
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{
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return __blk_queue_init_tags(NULL, depth, alloc_policy);
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}
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EXPORT_SYMBOL(blk_init_tags);
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/**
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* blk_queue_init_tags - initialize the queue tag info
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* @q: the request queue for the device
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* @depth: the maximum queue depth supported
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* @tags: the tag to use
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* @alloc_policy: tag allocation policy
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*
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* Queue lock must be held here if the function is called to resize an
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* existing map.
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**/
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int blk_queue_init_tags(struct request_queue *q, int depth,
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struct blk_queue_tag *tags, int alloc_policy)
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{
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int rc;
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BUG_ON(tags && q->queue_tags && tags != q->queue_tags);
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if (!tags && !q->queue_tags) {
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tags = __blk_queue_init_tags(q, depth, alloc_policy);
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if (!tags)
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return -ENOMEM;
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} else if (q->queue_tags) {
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rc = blk_queue_resize_tags(q, depth);
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if (rc)
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return rc;
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queue_flag_set(QUEUE_FLAG_QUEUED, q);
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return 0;
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} else
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atomic_inc(&tags->refcnt);
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/*
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* assign it, all done
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*/
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q->queue_tags = tags;
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queue_flag_set_unlocked(QUEUE_FLAG_QUEUED, q);
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return 0;
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}
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EXPORT_SYMBOL(blk_queue_init_tags);
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/**
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* blk_queue_resize_tags - change the queueing depth
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* @q: the request queue for the device
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* @new_depth: the new max command queueing depth
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*
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* Notes:
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* Must be called with the queue lock held.
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**/
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int blk_queue_resize_tags(struct request_queue *q, int new_depth)
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{
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struct blk_queue_tag *bqt = q->queue_tags;
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struct request **tag_index;
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unsigned long *tag_map;
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int max_depth, nr_ulongs;
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if (!bqt)
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return -ENXIO;
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/*
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* if we already have large enough real_max_depth. just
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* adjust max_depth. *NOTE* as requests with tag value
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* between new_depth and real_max_depth can be in-flight, tag
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* map can not be shrunk blindly here.
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*/
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if (new_depth <= bqt->real_max_depth) {
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bqt->max_depth = new_depth;
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return 0;
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}
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/*
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* Currently cannot replace a shared tag map with a new
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* one, so error out if this is the case
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*/
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if (atomic_read(&bqt->refcnt) != 1)
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return -EBUSY;
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/*
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* save the old state info, so we can copy it back
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*/
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tag_index = bqt->tag_index;
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tag_map = bqt->tag_map;
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max_depth = bqt->real_max_depth;
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if (init_tag_map(q, bqt, new_depth))
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return -ENOMEM;
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memcpy(bqt->tag_index, tag_index, max_depth * sizeof(struct request *));
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nr_ulongs = ALIGN(max_depth, BITS_PER_LONG) / BITS_PER_LONG;
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memcpy(bqt->tag_map, tag_map, nr_ulongs * sizeof(unsigned long));
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kfree(tag_index);
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kfree(tag_map);
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return 0;
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}
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EXPORT_SYMBOL(blk_queue_resize_tags);
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/**
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* blk_queue_end_tag - end tag operations for a request
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* @q: the request queue for the device
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* @rq: the request that has completed
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*
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* Description:
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* Typically called when end_that_request_first() returns %0, meaning
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* all transfers have been done for a request. It's important to call
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* this function before end_that_request_last(), as that will put the
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* request back on the free list thus corrupting the internal tag list.
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**/
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void blk_queue_end_tag(struct request_queue *q, struct request *rq)
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{
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struct blk_queue_tag *bqt = q->queue_tags;
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unsigned tag = rq->tag; /* negative tags invalid */
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lockdep_assert_held(q->queue_lock);
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BUG_ON(tag >= bqt->real_max_depth);
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list_del_init(&rq->queuelist);
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rq->rq_flags &= ~RQF_QUEUED;
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rq->tag = -1;
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rq->internal_tag = -1;
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if (unlikely(bqt->tag_index[tag] == NULL))
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printk(KERN_ERR "%s: tag %d is missing\n",
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__func__, tag);
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bqt->tag_index[tag] = NULL;
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if (unlikely(!test_bit(tag, bqt->tag_map))) {
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printk(KERN_ERR "%s: attempt to clear non-busy tag (%d)\n",
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__func__, tag);
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return;
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}
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/*
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* The tag_map bit acts as a lock for tag_index[bit], so we need
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* unlock memory barrier semantics.
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*/
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clear_bit_unlock(tag, bqt->tag_map);
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}
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/**
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* blk_queue_start_tag - find a free tag and assign it
|
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* @q: the request queue for the device
|
||||
* @rq: the block request that needs tagging
|
||||
*
|
||||
* Description:
|
||||
* This can either be used as a stand-alone helper, or possibly be
|
||||
* assigned as the queue &prep_rq_fn (in which case &struct request
|
||||
* automagically gets a tag assigned). Note that this function
|
||||
* assumes that any type of request can be queued! if this is not
|
||||
* true for your device, you must check the request type before
|
||||
* calling this function. The request will also be removed from
|
||||
* the request queue, so it's the drivers responsibility to readd
|
||||
* it if it should need to be restarted for some reason.
|
||||
**/
|
||||
int blk_queue_start_tag(struct request_queue *q, struct request *rq)
|
||||
{
|
||||
struct blk_queue_tag *bqt = q->queue_tags;
|
||||
unsigned max_depth;
|
||||
int tag;
|
||||
|
||||
lockdep_assert_held(q->queue_lock);
|
||||
|
||||
if (unlikely((rq->rq_flags & RQF_QUEUED))) {
|
||||
printk(KERN_ERR
|
||||
"%s: request %p for device [%s] already tagged %d",
|
||||
__func__, rq,
|
||||
rq->rq_disk ? rq->rq_disk->disk_name : "?", rq->tag);
|
||||
BUG();
|
||||
}
|
||||
|
||||
/*
|
||||
* Protect against shared tag maps, as we may not have exclusive
|
||||
* access to the tag map.
|
||||
*
|
||||
* We reserve a few tags just for sync IO, since we don't want
|
||||
* to starve sync IO on behalf of flooding async IO.
|
||||
*/
|
||||
max_depth = bqt->max_depth;
|
||||
if (!rq_is_sync(rq) && max_depth > 1) {
|
||||
switch (max_depth) {
|
||||
case 2:
|
||||
max_depth = 1;
|
||||
break;
|
||||
case 3:
|
||||
max_depth = 2;
|
||||
break;
|
||||
default:
|
||||
max_depth -= 2;
|
||||
}
|
||||
if (q->in_flight[BLK_RW_ASYNC] > max_depth)
|
||||
return 1;
|
||||
}
|
||||
|
||||
do {
|
||||
if (bqt->alloc_policy == BLK_TAG_ALLOC_FIFO) {
|
||||
tag = find_first_zero_bit(bqt->tag_map, max_depth);
|
||||
if (tag >= max_depth)
|
||||
return 1;
|
||||
} else {
|
||||
int start = bqt->next_tag;
|
||||
int size = min_t(int, bqt->max_depth, max_depth + start);
|
||||
tag = find_next_zero_bit(bqt->tag_map, size, start);
|
||||
if (tag >= size && start + size > bqt->max_depth) {
|
||||
size = start + size - bqt->max_depth;
|
||||
tag = find_first_zero_bit(bqt->tag_map, size);
|
||||
}
|
||||
if (tag >= size)
|
||||
return 1;
|
||||
}
|
||||
|
||||
} while (test_and_set_bit_lock(tag, bqt->tag_map));
|
||||
/*
|
||||
* We need lock ordering semantics given by test_and_set_bit_lock.
|
||||
* See blk_queue_end_tag for details.
|
||||
*/
|
||||
|
||||
bqt->next_tag = (tag + 1) % bqt->max_depth;
|
||||
rq->rq_flags |= RQF_QUEUED;
|
||||
rq->tag = tag;
|
||||
bqt->tag_index[tag] = rq;
|
||||
blk_start_request(rq);
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL(blk_queue_start_tag);
|
||||
@ -85,8 +85,6 @@ typedef __u32 __bitwise req_flags_t;
|
||||
#define RQF_SORTED ((__force req_flags_t)(1 << 0))
|
||||
/* drive already may have started this one */
|
||||
#define RQF_STARTED ((__force req_flags_t)(1 << 1))
|
||||
/* uses tagged queueing */
|
||||
#define RQF_QUEUED ((__force req_flags_t)(1 << 2))
|
||||
/* may not be passed by ioscheduler */
|
||||
#define RQF_SOFTBARRIER ((__force req_flags_t)(1 << 3))
|
||||
/* request for flush sequence */
|
||||
@ -336,15 +334,6 @@ enum blk_queue_state {
|
||||
Queue_up,
|
||||
};
|
||||
|
||||
struct blk_queue_tag {
|
||||
struct request **tag_index; /* map of busy tags */
|
||||
unsigned long *tag_map; /* bit map of free/busy tags */
|
||||
int max_depth; /* what we will send to device */
|
||||
int real_max_depth; /* what the array can hold */
|
||||
atomic_t refcnt; /* map can be shared */
|
||||
int alloc_policy; /* tag allocation policy */
|
||||
int next_tag; /* next tag */
|
||||
};
|
||||
#define BLK_TAG_ALLOC_FIFO 0 /* allocate starting from 0 */
|
||||
#define BLK_TAG_ALLOC_RR 1 /* allocate starting from last allocated tag */
|
||||
|
||||
@ -568,8 +557,6 @@ struct request_queue {
|
||||
unsigned int dma_pad_mask;
|
||||
unsigned int dma_alignment;
|
||||
|
||||
struct blk_queue_tag *queue_tags;
|
||||
|
||||
unsigned int nr_sorted;
|
||||
unsigned int in_flight[2];
|
||||
|
||||
@ -680,7 +667,6 @@ struct request_queue {
|
||||
u64 write_hints[BLK_MAX_WRITE_HINTS];
|
||||
};
|
||||
|
||||
#define QUEUE_FLAG_QUEUED 0 /* uses generic tag queueing */
|
||||
#define QUEUE_FLAG_STOPPED 1 /* queue is stopped */
|
||||
#define QUEUE_FLAG_DYING 2 /* queue being torn down */
|
||||
#define QUEUE_FLAG_BYPASS 3 /* act as dumb FIFO queue */
|
||||
@ -724,7 +710,6 @@ void blk_queue_flag_clear(unsigned int flag, struct request_queue *q);
|
||||
bool blk_queue_flag_test_and_set(unsigned int flag, struct request_queue *q);
|
||||
bool blk_queue_flag_test_and_clear(unsigned int flag, struct request_queue *q);
|
||||
|
||||
#define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags)
|
||||
#define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
|
||||
#define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags)
|
||||
#define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags)
|
||||
@ -1359,26 +1344,6 @@ static inline bool blk_needs_flush_plug(struct task_struct *tsk)
|
||||
!list_empty(&plug->cb_list));
|
||||
}
|
||||
|
||||
/*
|
||||
* tag stuff
|
||||
*/
|
||||
extern int blk_queue_start_tag(struct request_queue *, struct request *);
|
||||
extern struct request *blk_queue_find_tag(struct request_queue *, int);
|
||||
extern void blk_queue_end_tag(struct request_queue *, struct request *);
|
||||
extern int blk_queue_init_tags(struct request_queue *, int, struct blk_queue_tag *, int);
|
||||
extern void blk_queue_free_tags(struct request_queue *);
|
||||
extern int blk_queue_resize_tags(struct request_queue *, int);
|
||||
extern struct blk_queue_tag *blk_init_tags(int, int);
|
||||
extern void blk_free_tags(struct blk_queue_tag *);
|
||||
|
||||
static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt,
|
||||
int tag)
|
||||
{
|
||||
if (unlikely(bqt == NULL || tag >= bqt->real_max_depth))
|
||||
return NULL;
|
||||
return bqt->tag_index[tag];
|
||||
}
|
||||
|
||||
extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_t *);
|
||||
extern int blkdev_issue_write_same(struct block_device *bdev, sector_t sector,
|
||||
sector_t nr_sects, gfp_t gfp_mask, struct page *page);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user