#define RESERVED_REQUEST_BASED_IOS 256
static unsigned reserved_rq_based_ios = RESERVED_REQUEST_BASED_IOS;
-static bool use_blk_mq = IS_ENABLED(CONFIG_DM_MQ_DEFAULT);
-
-bool dm_use_blk_mq_default(void)
-{
- return use_blk_mq;
-}
-
-bool dm_use_blk_mq(struct mapped_device *md)
-{
- return md->use_blk_mq;
-}
-EXPORT_SYMBOL_GPL(dm_use_blk_mq);
-
unsigned dm_get_reserved_rq_based_ios(void)
{
return __dm_get_module_param(&reserved_rq_based_ios,
return queue_is_rq_based(md->queue);
}
-static void dm_old_start_queue(struct request_queue *q)
-{
- unsigned long flags;
-
- spin_lock_irqsave(q->queue_lock, flags);
- if (blk_queue_stopped(q))
- blk_start_queue(q);
- spin_unlock_irqrestore(q->queue_lock, flags);
-}
-
-static void dm_mq_start_queue(struct request_queue *q)
+void dm_start_queue(struct request_queue *q)
{
blk_mq_unquiesce_queue(q);
blk_mq_kick_requeue_list(q);
}
-void dm_start_queue(struct request_queue *q)
-{
- if (!q->mq_ops)
- dm_old_start_queue(q);
- else
- dm_mq_start_queue(q);
-}
-
-static void dm_old_stop_queue(struct request_queue *q)
-{
- unsigned long flags;
-
- spin_lock_irqsave(q->queue_lock, flags);
- if (!blk_queue_stopped(q))
- blk_stop_queue(q);
- spin_unlock_irqrestore(q->queue_lock, flags);
-}
-
-static void dm_mq_stop_queue(struct request_queue *q)
+void dm_stop_queue(struct request_queue *q)
{
if (blk_mq_queue_stopped(q))
return;
blk_mq_quiesce_queue(q);
}
-void dm_stop_queue(struct request_queue *q)
-{
- if (!q->mq_ops)
- dm_old_stop_queue(q);
- else
- dm_mq_stop_queue(q);
-}
-
/*
* Partial completion handling for request-based dm
*/
*/
static void rq_completed(struct mapped_device *md, int rw, bool run_queue)
{
- struct request_queue *q = md->queue;
- unsigned long flags;
-
atomic_dec(&md->pending[rw]);
/* nudge anyone waiting on suspend queue */
if (!md_in_flight(md))
wake_up(&md->wait);
- /*
- * Run this off this callpath, as drivers could invoke end_io while
- * inside their request_fn (and holding the queue lock). Calling
- * back into ->request_fn() could deadlock attempting to grab the
- * queue lock again.
- */
- if (!q->mq_ops && run_queue) {
- spin_lock_irqsave(q->queue_lock, flags);
- blk_run_queue_async(q);
- spin_unlock_irqrestore(q->queue_lock, flags);
- }
-
/*
* dm_put() must be at the end of this function. See the comment above
*/
tio->ti->type->release_clone_rq(clone);
rq_end_stats(md, rq);
- if (!rq->q->mq_ops)
- blk_end_request_all(rq, error);
- else
- blk_mq_end_request(rq, error);
+ blk_mq_end_request(rq, error);
rq_completed(md, rw, true);
}
-/*
- * Requeue the original request of a clone.
- */
-static void dm_old_requeue_request(struct request *rq, unsigned long delay_ms)
-{
- struct request_queue *q = rq->q;
- unsigned long flags;
-
- spin_lock_irqsave(q->queue_lock, flags);
- blk_requeue_request(q, rq);
- blk_delay_queue(q, delay_ms);
- spin_unlock_irqrestore(q->queue_lock, flags);
-}
-
static void __dm_mq_kick_requeue_list(struct request_queue *q, unsigned long msecs)
{
blk_mq_delay_kick_requeue_list(q, msecs);
tio->ti->type->release_clone_rq(tio->clone);
}
- if (!rq->q->mq_ops)
- dm_old_requeue_request(rq, delay_ms);
- else
- dm_mq_delay_requeue_request(rq, delay_ms);
-
+ dm_mq_delay_requeue_request(rq, delay_ms);
rq_completed(md, rw, false);
}
rq_end_stats(md, rq);
rw = rq_data_dir(rq);
- if (!rq->q->mq_ops)
- blk_end_request_all(rq, tio->error);
- else
- blk_mq_end_request(rq, tio->error);
+ blk_mq_end_request(rq, tio->error);
rq_completed(md, rw, false);
return;
}
struct dm_rq_target_io *tio = tio_from_request(rq);
tio->error = error;
- if (!rq->q->mq_ops)
- blk_complete_request(rq);
- else
- blk_mq_complete_request(rq);
+ blk_mq_complete_request(rq);
}
/*
* Complete the not-mapped clone and the original request with the error status
* through softirq context.
* Target's rq_end_io() function isn't called.
- * This may be used when the target's map_rq() or clone_and_map_rq() functions fail.
+ * This may be used when the target's clone_and_map_rq() function fails.
*/
static void dm_kill_unmapped_request(struct request *rq, blk_status_t error)
{
dm_complete_request(rq, error);
}
-/*
- * Called with the clone's queue lock held (in the case of .request_fn)
- */
static void end_clone_request(struct request *clone, blk_status_t error)
{
struct dm_rq_target_io *tio = clone->end_io_data;
- /*
- * Actual request completion is done in a softirq context which doesn't
- * hold the clone's queue lock. Otherwise, deadlock could occur because:
- * - another request may be submitted by the upper level driver
- * of the stacking during the completion
- * - the submission which requires queue lock may be done
- * against this clone's queue
- */
dm_complete_request(tio->orig, error);
}
return 0;
}
-static void map_tio_request(struct kthread_work *work);
-
static void init_tio(struct dm_rq_target_io *tio, struct request *rq,
struct mapped_device *md)
{
*/
if (!md->init_tio_pdu)
memset(&tio->info, 0, sizeof(tio->info));
- if (md->kworker_task)
- kthread_init_work(&tio->work, map_tio_request);
}
/*
blk_rq_unprep_clone(clone);
tio->ti->type->release_clone_rq(clone);
tio->clone = NULL;
- if (!rq->q->mq_ops)
- r = DM_MAPIO_DELAY_REQUEUE;
- else
- r = DM_MAPIO_REQUEUE;
+ r = DM_MAPIO_REQUEUE;
goto check_again;
}
break;
return r;
}
+/* DEPRECATED: previously used for request-based merge heuristic in dm_request_fn() */
+ssize_t dm_attr_rq_based_seq_io_merge_deadline_show(struct mapped_device *md, char *buf)
+{
+ return sprintf(buf, "%u\n", 0);
+}
+
+ssize_t dm_attr_rq_based_seq_io_merge_deadline_store(struct mapped_device *md,
+ const char *buf, size_t count)
+{
+ return count;
+}
+
static void dm_start_request(struct mapped_device *md, struct request *orig)
{
- if (!orig->q->mq_ops)
- blk_start_request(orig);
- else
- blk_mq_start_request(orig);
+ blk_mq_start_request(orig);
atomic_inc(&md->pending[rq_data_dir(orig)]);
- if (md->seq_rq_merge_deadline_usecs) {
- md->last_rq_pos = rq_end_sector(orig);
- md->last_rq_rw = rq_data_dir(orig);
- md->last_rq_start_time = ktime_get();
- }
-
if (unlikely(dm_stats_used(&md->stats))) {
struct dm_rq_target_io *tio = tio_from_request(orig);
tio->duration_jiffies = jiffies;
dm_get(md);
}
-static int __dm_rq_init_rq(struct mapped_device *md, struct request *rq)
+static int dm_mq_init_request(struct blk_mq_tag_set *set, struct request *rq,
+ unsigned int hctx_idx, unsigned int numa_node)
{
+ struct mapped_device *md = set->driver_data;
struct dm_rq_target_io *tio = blk_mq_rq_to_pdu(rq);
/*
return 0;
}
-static int dm_rq_init_rq(struct request_queue *q, struct request *rq, gfp_t gfp)
-{
- return __dm_rq_init_rq(q->rq_alloc_data, rq);
-}
-
-static void map_tio_request(struct kthread_work *work)
-{
- struct dm_rq_target_io *tio = container_of(work, struct dm_rq_target_io, work);
-
- if (map_request(tio) == DM_MAPIO_REQUEUE)
- dm_requeue_original_request(tio, false);
-}
-
-ssize_t dm_attr_rq_based_seq_io_merge_deadline_show(struct mapped_device *md, char *buf)
-{
- return sprintf(buf, "%u\n", md->seq_rq_merge_deadline_usecs);
-}
-
-#define MAX_SEQ_RQ_MERGE_DEADLINE_USECS 100000
-
-ssize_t dm_attr_rq_based_seq_io_merge_deadline_store(struct mapped_device *md,
- const char *buf, size_t count)
-{
- unsigned deadline;
-
- if (dm_get_md_type(md) != DM_TYPE_REQUEST_BASED)
- return count;
-
- if (kstrtouint(buf, 10, &deadline))
- return -EINVAL;
-
- if (deadline > MAX_SEQ_RQ_MERGE_DEADLINE_USECS)
- deadline = MAX_SEQ_RQ_MERGE_DEADLINE_USECS;
-
- md->seq_rq_merge_deadline_usecs = deadline;
-
- return count;
-}
-
-static bool dm_old_request_peeked_before_merge_deadline(struct mapped_device *md)
-{
- ktime_t kt_deadline;
-
- if (!md->seq_rq_merge_deadline_usecs)
- return false;
-
- kt_deadline = ns_to_ktime((u64)md->seq_rq_merge_deadline_usecs * NSEC_PER_USEC);
- kt_deadline = ktime_add_safe(md->last_rq_start_time, kt_deadline);
-
- return !ktime_after(ktime_get(), kt_deadline);
-}
-
-/*
- * q->request_fn for old request-based dm.
- * Called with the queue lock held.
- */
-static void dm_old_request_fn(struct request_queue *q)
-{
- struct mapped_device *md = q->queuedata;
- struct dm_target *ti = md->immutable_target;
- struct request *rq;
- struct dm_rq_target_io *tio;
- sector_t pos = 0;
-
- if (unlikely(!ti)) {
- int srcu_idx;
- struct dm_table *map = dm_get_live_table(md, &srcu_idx);
-
- if (unlikely(!map)) {
- dm_put_live_table(md, srcu_idx);
- return;
- }
- ti = dm_table_find_target(map, pos);
- dm_put_live_table(md, srcu_idx);
- }
-
- /*
- * For suspend, check blk_queue_stopped() and increment
- * ->pending within a single queue_lock not to increment the
- * number of in-flight I/Os after the queue is stopped in
- * dm_suspend().
- */
- while (!blk_queue_stopped(q)) {
- rq = blk_peek_request(q);
- if (!rq)
- return;
-
- /* always use block 0 to find the target for flushes for now */
- pos = 0;
- if (req_op(rq) != REQ_OP_FLUSH)
- pos = blk_rq_pos(rq);
-
- if ((dm_old_request_peeked_before_merge_deadline(md) &&
- md_in_flight(md) && rq->bio && !bio_multiple_segments(rq->bio) &&
- md->last_rq_pos == pos && md->last_rq_rw == rq_data_dir(rq)) ||
- (ti->type->busy && ti->type->busy(ti))) {
- blk_delay_queue(q, 10);
- return;
- }
-
- dm_start_request(md, rq);
-
- tio = tio_from_request(rq);
- init_tio(tio, rq, md);
- /* Establish tio->ti before queuing work (map_tio_request) */
- tio->ti = ti;
- kthread_queue_work(&md->kworker, &tio->work);
- BUG_ON(!irqs_disabled());
- }
-}
-
-/*
- * Fully initialize a .request_fn request-based queue.
- */
-int dm_old_init_request_queue(struct mapped_device *md, struct dm_table *t)
-{
- struct dm_target *immutable_tgt;
-
- /* Fully initialize the queue */
- md->queue->cmd_size = sizeof(struct dm_rq_target_io);
- md->queue->rq_alloc_data = md;
- md->queue->request_fn = dm_old_request_fn;
- md->queue->init_rq_fn = dm_rq_init_rq;
-
- immutable_tgt = dm_table_get_immutable_target(t);
- if (immutable_tgt && immutable_tgt->per_io_data_size) {
- /* any target-specific per-io data is immediately after the tio */
- md->queue->cmd_size += immutable_tgt->per_io_data_size;
- md->init_tio_pdu = true;
- }
- if (blk_init_allocated_queue(md->queue) < 0)
- return -EINVAL;
-
- /* disable dm_old_request_fn's merge heuristic by default */
- md->seq_rq_merge_deadline_usecs = 0;
-
- blk_queue_softirq_done(md->queue, dm_softirq_done);
-
- /* Initialize the request-based DM worker thread */
- kthread_init_worker(&md->kworker);
- md->kworker_task = kthread_run(kthread_worker_fn, &md->kworker,
- "kdmwork-%s", dm_device_name(md));
- if (IS_ERR(md->kworker_task)) {
- int error = PTR_ERR(md->kworker_task);
- md->kworker_task = NULL;
- return error;
- }
-
- return 0;
-}
-
-static int dm_mq_init_request(struct blk_mq_tag_set *set, struct request *rq,
- unsigned int hctx_idx, unsigned int numa_node)
-{
- return __dm_rq_init_rq(set->driver_data, rq);
-}
-
static blk_status_t dm_mq_queue_rq(struct blk_mq_hw_ctx *hctx,
const struct blk_mq_queue_data *bd)
{
struct dm_target *immutable_tgt;
int err;
- if (!dm_table_all_blk_mq_devices(t)) {
- DMERR("request-based dm-mq may only be stacked on blk-mq device(s)");
- return -EINVAL;
- }
-
md->tag_set = kzalloc_node(sizeof(struct blk_mq_tag_set), GFP_KERNEL, md->numa_node_id);
if (!md->tag_set)
return -ENOMEM;
module_param(reserved_rq_based_ios, uint, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(reserved_rq_based_ios, "Reserved IOs in request-based mempools");
+/* Unused, but preserved for userspace compatibility */
+static bool use_blk_mq = true;
module_param(use_blk_mq, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(use_blk_mq, "Use block multiqueue for request-based DM devices");
bool integrity_supported:1;
bool singleton:1;
- bool all_blk_mq:1;
unsigned integrity_added:1;
/*
static bool dm_table_does_not_support_partial_completion(struct dm_table *t);
-struct verify_rq_based_data {
- unsigned sq_count;
- unsigned mq_count;
-};
-
static int device_is_rq_based(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);
- struct verify_rq_based_data *v = data;
-
- if (q->mq_ops)
- v->mq_count++;
- else
- v->sq_count++;
return queue_is_rq_based(q);
}
{
unsigned i;
unsigned bio_based = 0, request_based = 0, hybrid = 0;
- struct verify_rq_based_data v = {.sq_count = 0, .mq_count = 0};
struct dm_target *tgt;
struct list_head *devices = dm_table_get_devices(t);
enum dm_queue_mode live_md_type = dm_get_md_type(t->md);
int srcu_idx;
struct dm_table *live_table = dm_get_live_table(t->md, &srcu_idx);
- /* inherit live table's type and all_blk_mq */
- if (live_table) {
+ /* inherit live table's type */
+ if (live_table)
t->type = live_table->type;
- t->all_blk_mq = live_table->all_blk_mq;
- }
dm_put_live_table(t->md, srcu_idx);
return 0;
}
/* Non-request-stackable devices can't be used for request-based dm */
if (!tgt->type->iterate_devices ||
- !tgt->type->iterate_devices(tgt, device_is_rq_based, &v)) {
+ !tgt->type->iterate_devices(tgt, device_is_rq_based, NULL)) {
DMERR("table load rejected: including non-request-stackable devices");
return -EINVAL;
}
- if (v.sq_count && v.mq_count) {
- DMERR("table load rejected: not all devices are blk-mq request-stackable");
- return -EINVAL;
- }
- t->all_blk_mq = v.mq_count > 0;
-
- if (!t->all_blk_mq &&
- (t->type == DM_TYPE_MQ_REQUEST_BASED || t->type == DM_TYPE_NVME_BIO_BASED)) {
- DMERR("table load rejected: all devices are not blk-mq request-stackable");
- return -EINVAL;
- }
return 0;
}
return __table_type_request_based(dm_table_get_type(t));
}
-bool dm_table_all_blk_mq_devices(struct dm_table *t)
-{
- return t->all_blk_mq;
-}
-
static int dm_table_alloc_md_mempools(struct dm_table *t, struct mapped_device *md)
{
enum dm_queue_mode type = dm_table_get_type(t);
{
struct mapped_device *md;
struct request_queue *queue;
- unsigned long flags;
if (!dm_table_request_based(t))
return;
md = dm_table_get_md(t);
queue = dm_get_md_queue(md);
- if (queue) {
- if (queue->mq_ops)
- blk_mq_run_hw_queues(queue, true);
- else {
- spin_lock_irqsave(queue->queue_lock, flags);
- blk_run_queue_async(queue);
- spin_unlock_irqrestore(queue->queue_lock, flags);
- }
- }
+ if (queue)
+ blk_mq_run_hw_queues(queue, true);
}
EXPORT_SYMBOL(dm_table_run_md_queue_async);
projects / mirror_ubuntu-eoan-kernel.git / commitdiff