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authorLinus Torvalds <torvalds@linux-foundation.org>2021-01-01 12:58:07 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2021-01-01 12:58:07 -0800
commiteda809aef53426d044b519405d25d9da55319b76 (patch)
tree31a7fabf4bdd816b1c6aedb70f6f44149a806288 /block
parent8b4805c68ae348b36a24a4c4b5c869c8971ab0c2 (diff)
parentcb5253198f10a4cd79b7523c581e6173c7d49ddb (diff)
Merge tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
Pull SCSI fixes from James Bottomley: "This is a load of driver fixes (12 ufs, 1 mpt3sas, 1 cxgbi). The big core two fixes are for power management ("block: Do not accept any requests while suspended" and "block: Fix a race in the runtime power management code") which finally sorts out the resume problems we've occasionally been having. To make the resume fix, there are seven necessary precursors which effectively renames REQ_PREEMPT to REQ_PM, so every "special" request in block is automatically a power management exempt one. All of the non-PM preempt cases are removed except for the one in the SCSI Parallel Interface (spi) domain validation which is a genuine case where we have to run requests at high priority to validate the bus so this becomes an autopm get/put protected request" * tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi: (22 commits) scsi: cxgb4i: Fix TLS dependency scsi: ufs: Un-inline ufshcd_vops_device_reset function scsi: ufs: Re-enable WriteBooster after device reset scsi: ufs-mediatek: Use correct path to fix compile error scsi: mpt3sas: Signedness bug in _base_get_diag_triggers() scsi: block: Do not accept any requests while suspended scsi: block: Remove RQF_PREEMPT and BLK_MQ_REQ_PREEMPT scsi: core: Only process PM requests if rpm_status != RPM_ACTIVE scsi: scsi_transport_spi: Set RQF_PM for domain validation commands scsi: ide: Mark power management requests with RQF_PM instead of RQF_PREEMPT scsi: ide: Do not set the RQF_PREEMPT flag for sense requests scsi: block: Introduce BLK_MQ_REQ_PM scsi: block: Fix a race in the runtime power management code scsi: ufs-pci: Enable UFSHCD_CAP_RPM_AUTOSUSPEND for Intel controllers scsi: ufs-pci: Fix recovery from hibernate exit errors for Intel controllers scsi: ufs-pci: Ensure UFS device is in PowerDown mode for suspend-to-disk ->poweroff() scsi: ufs-pci: Fix restore from S4 for Intel controllers scsi: ufs-mediatek: Keep VCC always-on for specific devices scsi: ufs: Allow regulators being always-on scsi: ufs: Clear UAC for RPMB after ufshcd resets ...
Diffstat (limited to 'block')
-rw-r--r--block/blk-core.c13
-rw-r--r--block/blk-mq-debugfs.c1
-rw-r--r--block/blk-mq.c4
-rw-r--r--block/blk-pm.c15
-rw-r--r--block/blk-pm.h14
5 files changed, 27 insertions, 20 deletions
diff --git a/block/blk-core.c b/block/blk-core.c
index 96e5fcd7f071..7663a9b94b80 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -18,6 +18,7 @@
#include <linux/bio.h>
#include <linux/blkdev.h>
#include <linux/blk-mq.h>
+#include <linux/blk-pm.h>
#include <linux/highmem.h>
#include <linux/mm.h>
#include <linux/pagemap.h>
@@ -424,11 +425,11 @@ EXPORT_SYMBOL(blk_cleanup_queue);
/**
* blk_queue_enter() - try to increase q->q_usage_counter
* @q: request queue pointer
- * @flags: BLK_MQ_REQ_NOWAIT and/or BLK_MQ_REQ_PREEMPT
+ * @flags: BLK_MQ_REQ_NOWAIT and/or BLK_MQ_REQ_PM
*/
int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags)
{
- const bool pm = flags & BLK_MQ_REQ_PREEMPT;
+ const bool pm = flags & BLK_MQ_REQ_PM;
while (true) {
bool success = false;
@@ -440,7 +441,8 @@ int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags)
* responsible for ensuring that that counter is
* globally visible before the queue is unfrozen.
*/
- if (pm || !blk_queue_pm_only(q)) {
+ if ((pm && queue_rpm_status(q) != RPM_SUSPENDED) ||
+ !blk_queue_pm_only(q)) {
success = true;
} else {
percpu_ref_put(&q->q_usage_counter);
@@ -465,8 +467,7 @@ int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags)
wait_event(q->mq_freeze_wq,
(!q->mq_freeze_depth &&
- (pm || (blk_pm_request_resume(q),
- !blk_queue_pm_only(q)))) ||
+ blk_pm_resume_queue(pm, q)) ||
blk_queue_dying(q));
if (blk_queue_dying(q))
return -ENODEV;
@@ -630,7 +631,7 @@ struct request *blk_get_request(struct request_queue *q, unsigned int op,
struct request *req;
WARN_ON_ONCE(op & REQ_NOWAIT);
- WARN_ON_ONCE(flags & ~(BLK_MQ_REQ_NOWAIT | BLK_MQ_REQ_PREEMPT));
+ WARN_ON_ONCE(flags & ~(BLK_MQ_REQ_NOWAIT | BLK_MQ_REQ_PM));
req = blk_mq_alloc_request(q, op, flags);
if (!IS_ERR(req) && q->mq_ops->initialize_rq_fn)
diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c
index e21eed20a155..4d6e83e5b442 100644
--- a/block/blk-mq-debugfs.c
+++ b/block/blk-mq-debugfs.c
@@ -298,7 +298,6 @@ static const char *const rqf_name[] = {
RQF_NAME(MIXED_MERGE),
RQF_NAME(MQ_INFLIGHT),
RQF_NAME(DONTPREP),
- RQF_NAME(PREEMPT),
RQF_NAME(FAILED),
RQF_NAME(QUIET),
RQF_NAME(ELVPRIV),
diff --git a/block/blk-mq.c b/block/blk-mq.c
index c338c9bc5a2c..f285a9123a8b 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -294,8 +294,8 @@ static struct request *blk_mq_rq_ctx_init(struct blk_mq_alloc_data *data,
rq->mq_hctx = data->hctx;
rq->rq_flags = 0;
rq->cmd_flags = data->cmd_flags;
- if (data->flags & BLK_MQ_REQ_PREEMPT)
- rq->rq_flags |= RQF_PREEMPT;
+ if (data->flags & BLK_MQ_REQ_PM)
+ rq->rq_flags |= RQF_PM;
if (blk_queue_io_stat(data->q))
rq->rq_flags |= RQF_IO_STAT;
INIT_LIST_HEAD(&rq->queuelist);
diff --git a/block/blk-pm.c b/block/blk-pm.c
index b85234d758f7..17bd020268d4 100644
--- a/block/blk-pm.c
+++ b/block/blk-pm.c
@@ -67,6 +67,10 @@ int blk_pre_runtime_suspend(struct request_queue *q)
WARN_ON_ONCE(q->rpm_status != RPM_ACTIVE);
+ spin_lock_irq(&q->queue_lock);
+ q->rpm_status = RPM_SUSPENDING;
+ spin_unlock_irq(&q->queue_lock);
+
/*
* Increase the pm_only counter before checking whether any
* non-PM blk_queue_enter() calls are in progress to avoid that any
@@ -89,15 +93,14 @@ int blk_pre_runtime_suspend(struct request_queue *q)
/* Switch q_usage_counter back to per-cpu mode. */
blk_mq_unfreeze_queue(q);
- spin_lock_irq(&q->queue_lock);
- if (ret < 0)
+ if (ret < 0) {
+ spin_lock_irq(&q->queue_lock);
+ q->rpm_status = RPM_ACTIVE;
pm_runtime_mark_last_busy(q->dev);
- else
- q->rpm_status = RPM_SUSPENDING;
- spin_unlock_irq(&q->queue_lock);
+ spin_unlock_irq(&q->queue_lock);
- if (ret)
blk_clear_pm_only(q);
+ }
return ret;
}
diff --git a/block/blk-pm.h b/block/blk-pm.h
index ea5507d23e75..a2283cc9f716 100644
--- a/block/blk-pm.h
+++ b/block/blk-pm.h
@@ -6,11 +6,14 @@
#include <linux/pm_runtime.h>
#ifdef CONFIG_PM
-static inline void blk_pm_request_resume(struct request_queue *q)
+static inline int blk_pm_resume_queue(const bool pm, struct request_queue *q)
{
- if (q->dev && (q->rpm_status == RPM_SUSPENDED ||
- q->rpm_status == RPM_SUSPENDING))
- pm_request_resume(q->dev);
+ if (!q->dev || !blk_queue_pm_only(q))
+ return 1; /* Nothing to do */
+ if (pm && q->rpm_status != RPM_SUSPENDED)
+ return 1; /* Request allowed */
+ pm_request_resume(q->dev);
+ return 0;
}
static inline void blk_pm_mark_last_busy(struct request *rq)
@@ -44,8 +47,9 @@ static inline void blk_pm_put_request(struct request *rq)
--rq->q->nr_pending;
}
#else
-static inline void blk_pm_request_resume(struct request_queue *q)
+static inline int blk_pm_resume_queue(const bool pm, struct request_queue *q)
{
+ return 1;
}
static inline void blk_pm_mark_last_busy(struct request *rq)