summaryrefslogtreecommitdiff
path: root/block/blk-tag.c
diff options
context:
space:
mode:
Diffstat (limited to 'block/blk-tag.c')
-rw-r--r--block/blk-tag.c378
1 files changed, 0 insertions, 378 deletions
diff --git a/block/blk-tag.c b/block/blk-tag.c
deleted file mode 100644
index fbc153aef166..000000000000
--- a/block/blk-tag.c
+++ /dev/null
@@ -1,378 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Functions related to tagged command queuing
- */
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/bio.h>
-#include <linux/blkdev.h>
-#include <linux/slab.h>
-
-#include "blk.h"
-
-/**
- * blk_queue_find_tag - find a request by its tag and queue
- * @q: The request queue for the device
- * @tag: The tag of the request
- *
- * Notes:
- * Should be used when a device returns a tag and you want to match
- * it with a request.
- *
- * no locks need be held.
- **/
-struct request *blk_queue_find_tag(struct request_queue *q, int tag)
-{
- return blk_map_queue_find_tag(q->queue_tags, tag);
-}
-EXPORT_SYMBOL(blk_queue_find_tag);
-
-/**
- * blk_free_tags - release a given set of tag maintenance info
- * @bqt: the tag map to free
- *
- * Drop the reference count on @bqt and frees it when the last reference
- * is dropped.
- */
-void blk_free_tags(struct blk_queue_tag *bqt)
-{
- if (atomic_dec_and_test(&bqt->refcnt)) {
- BUG_ON(find_first_bit(bqt->tag_map, bqt->max_depth) <
- bqt->max_depth);
-
- kfree(bqt->tag_index);
- bqt->tag_index = NULL;
-
- kfree(bqt->tag_map);
- bqt->tag_map = NULL;
-
- kfree(bqt);
- }
-}
-EXPORT_SYMBOL(blk_free_tags);
-
-/**
- * __blk_queue_free_tags - release tag maintenance info
- * @q: the request queue for the device
- *
- * Notes:
- * blk_cleanup_queue() will take care of calling this function, if tagging
- * has been used. So there's no need to call this directly.
- **/
-void __blk_queue_free_tags(struct request_queue *q)
-{
- struct blk_queue_tag *bqt = q->queue_tags;
-
- if (!bqt)
- return;
-
- blk_free_tags(bqt);
-
- q->queue_tags = NULL;
- queue_flag_clear_unlocked(QUEUE_FLAG_QUEUED, q);
-}
-
-/**
- * blk_queue_free_tags - release tag maintenance info
- * @q: the request queue for the device
- *
- * Notes:
- * This is used to disable tagged queuing to a device, yet leave
- * queue in function.
- **/
-void blk_queue_free_tags(struct request_queue *q)
-{
- queue_flag_clear_unlocked(QUEUE_FLAG_QUEUED, q);
-}
-EXPORT_SYMBOL(blk_queue_free_tags);
-
-static int
-init_tag_map(struct request_queue *q, struct blk_queue_tag *tags, int depth)
-{
- struct request **tag_index;
- unsigned long *tag_map;
- int nr_ulongs;
-
- if (q && depth > q->nr_requests * 2) {
- depth = q->nr_requests * 2;
- printk(KERN_ERR "%s: adjusted depth to %d\n",
- __func__, depth);
- }
-
- tag_index = kcalloc(depth, sizeof(struct request *), GFP_ATOMIC);
- if (!tag_index)
- goto fail;
-
- nr_ulongs = ALIGN(depth, BITS_PER_LONG) / BITS_PER_LONG;
- tag_map = kcalloc(nr_ulongs, sizeof(unsigned long), GFP_ATOMIC);
- if (!tag_map)
- goto fail;
-
- tags->real_max_depth = depth;
- tags->max_depth = depth;
- tags->tag_index = tag_index;
- tags->tag_map = tag_map;
-
- return 0;
-fail:
- kfree(tag_index);
- return -ENOMEM;
-}
-
-static struct blk_queue_tag *__blk_queue_init_tags(struct request_queue *q,
- int depth, int alloc_policy)
-{
- struct blk_queue_tag *tags;
-
- tags = kmalloc(sizeof(struct blk_queue_tag), GFP_ATOMIC);
- if (!tags)
- goto fail;
-
- if (init_tag_map(q, tags, depth))
- goto fail;
-
- atomic_set(&tags->refcnt, 1);
- tags->alloc_policy = alloc_policy;
- tags->next_tag = 0;
- return tags;
-fail:
- kfree(tags);
- return NULL;
-}
-
-/**
- * blk_init_tags - initialize the tag info for an external tag map
- * @depth: the maximum queue depth supported
- * @alloc_policy: tag allocation policy
- **/
-struct blk_queue_tag *blk_init_tags(int depth, int alloc_policy)
-{
- return __blk_queue_init_tags(NULL, depth, alloc_policy);
-}
-EXPORT_SYMBOL(blk_init_tags);
-
-/**
- * blk_queue_init_tags - initialize the queue tag info
- * @q: the request queue for the device
- * @depth: the maximum queue depth supported
- * @tags: the tag to use
- * @alloc_policy: tag allocation policy
- *
- * Queue lock must be held here if the function is called to resize an
- * existing map.
- **/
-int blk_queue_init_tags(struct request_queue *q, int depth,
- struct blk_queue_tag *tags, int alloc_policy)
-{
- int rc;
-
- BUG_ON(tags && q->queue_tags && tags != q->queue_tags);
-
- if (!tags && !q->queue_tags) {
- tags = __blk_queue_init_tags(q, depth, alloc_policy);
-
- if (!tags)
- return -ENOMEM;
-
- } else if (q->queue_tags) {
- rc = blk_queue_resize_tags(q, depth);
- if (rc)
- return rc;
- queue_flag_set(QUEUE_FLAG_QUEUED, q);
- return 0;
- } else
- atomic_inc(&tags->refcnt);
-
- /*
- * assign it, all done
- */
- q->queue_tags = tags;
- queue_flag_set_unlocked(QUEUE_FLAG_QUEUED, q);
- return 0;
-}
-EXPORT_SYMBOL(blk_queue_init_tags);
-
-/**
- * blk_queue_resize_tags - change the queueing depth
- * @q: the request queue for the device
- * @new_depth: the new max command queueing depth
- *
- * Notes:
- * Must be called with the queue lock held.
- **/
-int blk_queue_resize_tags(struct request_queue *q, int new_depth)
-{
- struct blk_queue_tag *bqt = q->queue_tags;
- struct request **tag_index;
- unsigned long *tag_map;
- int max_depth, nr_ulongs;
-
- if (!bqt)
- return -ENXIO;
-
- /*
- * if we already have large enough real_max_depth. just
- * adjust max_depth. *NOTE* as requests with tag value
- * between new_depth and real_max_depth can be in-flight, tag
- * map can not be shrunk blindly here.
- */
- if (new_depth <= bqt->real_max_depth) {
- bqt->max_depth = new_depth;
- return 0;
- }
-
- /*
- * Currently cannot replace a shared tag map with a new
- * one, so error out if this is the case
- */
- if (atomic_read(&bqt->refcnt) != 1)
- return -EBUSY;
-
- /*
- * save the old state info, so we can copy it back
- */
- tag_index = bqt->tag_index;
- tag_map = bqt->tag_map;
- max_depth = bqt->real_max_depth;
-
- if (init_tag_map(q, bqt, new_depth))
- return -ENOMEM;
-
- memcpy(bqt->tag_index, tag_index, max_depth * sizeof(struct request *));
- nr_ulongs = ALIGN(max_depth, BITS_PER_LONG) / BITS_PER_LONG;
- memcpy(bqt->tag_map, tag_map, nr_ulongs * sizeof(unsigned long));
-
- kfree(tag_index);
- kfree(tag_map);
- return 0;
-}
-EXPORT_SYMBOL(blk_queue_resize_tags);
-
-/**
- * blk_queue_end_tag - end tag operations for a request
- * @q: the request queue for the device
- * @rq: the request that has completed
- *
- * Description:
- * Typically called when end_that_request_first() returns %0, meaning
- * all transfers have been done for a request. It's important to call
- * this function before end_that_request_last(), as that will put the
- * request back on the free list thus corrupting the internal tag list.
- **/
-void blk_queue_end_tag(struct request_queue *q, struct request *rq)
-{
- struct blk_queue_tag *bqt = q->queue_tags;
- unsigned tag = rq->tag; /* negative tags invalid */
-
- lockdep_assert_held(q->queue_lock);
-
- BUG_ON(tag >= bqt->real_max_depth);
-
- list_del_init(&rq->queuelist);
- rq->rq_flags &= ~RQF_QUEUED;
- rq->tag = -1;
- rq->internal_tag = -1;
-
- if (unlikely(bqt->tag_index[tag] == NULL))
- printk(KERN_ERR "%s: tag %d is missing\n",
- __func__, tag);
-
- bqt->tag_index[tag] = NULL;
-
- if (unlikely(!test_bit(tag, bqt->tag_map))) {
- printk(KERN_ERR "%s: attempt to clear non-busy tag (%d)\n",
- __func__, tag);
- return;
- }
- /*
- * The tag_map bit acts as a lock for tag_index[bit], so we need
- * unlock memory barrier semantics.
- */
- clear_bit_unlock(tag, bqt->tag_map);
-}
-
-/**
- * blk_queue_start_tag - find a free tag and assign it
- * @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);