[PATCH 5.15.y 1/4] scsi: core: pm: Rely on the device driver core for async power management

[Sasha Levin <sashal@kernel.org>]

From: Bart Van Assche <bvanassche@acm.org>

[ Upstream commit a19a93e4c6a98c9c0f2f5a6db76846f10d7d1f85 ]

Instead of implementing asynchronous resume support in the SCSI core, rely
on the device driver core for resuming SCSI devices asynchronously.
Instead of only supporting asynchronous resumes, also support asynchronous
suspends.

Link: https://lore.kernel.org/r/20211006215453.3318929-2-bvanassche@acm.org
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Hannes Reinecke <hare@suse.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Martin Kepplinger <martin.kepplinger@puri.sm>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Stable-dep-of: 1e111c4b3a72 ("scsi: sd: fix missing put_disk() when device_add(&disk_dev) fails")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/scsi/hosts.c      |  1 +
 drivers/scsi/scsi.c       |  8 -------
 drivers/scsi/scsi_pm.c    | 44 ++-------------------------------------
 drivers/scsi/scsi_priv.h  |  4 +---
 drivers/scsi/scsi_scan.c  | 17 +++++++++++++++
 drivers/scsi/scsi_sysfs.c |  1 +
 drivers/scsi/sd.c         |  1 -
 7 files changed, 22 insertions(+), 54 deletions(-)

diff --git a/drivers/scsi/hosts.c b/drivers/scsi/hosts.c
index cf842c97639a7..c7d85591a192f 100644
--- a/drivers/scsi/hosts.c
+++ b/drivers/scsi/hosts.c
@@ -487,6 +487,7 @@ struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *sht, int privsize)
 	dev_set_name(&shost->shost_gendev, "host%d", shost->host_no);
 	shost->shost_gendev.bus = &scsi_bus_type;
 	shost->shost_gendev.type = &scsi_host_type;
+	scsi_enable_async_suspend(&shost->shost_gendev);
 
 	device_initialize(&shost->shost_dev);
 	shost->shost_dev.parent = &shost->shost_gendev;
diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c
index a499a57150720..d031c577d5d32 100644
--- a/drivers/scsi/scsi.c
+++ b/drivers/scsi/scsi.c
@@ -86,14 +86,6 @@ unsigned int scsi_logging_level;
 EXPORT_SYMBOL(scsi_logging_level);
 #endif
 
-/*
- * Domain for asynchronous system resume operations.  It is marked 'exclusive'
- * to avoid being included in the async_synchronize_full() that is invoked by
- * dpm_resume().
- */
-ASYNC_DOMAIN_EXCLUSIVE(scsi_sd_pm_domain);
-EXPORT_SYMBOL(scsi_sd_pm_domain);
-
 #ifdef CONFIG_SCSI_LOGGING
 void scsi_log_send(struct scsi_cmnd *cmd)
 {
diff --git a/drivers/scsi/scsi_pm.c b/drivers/scsi/scsi_pm.c
index e91a0a5bc7a3e..c622e7f812daf 100644
--- a/drivers/scsi/scsi_pm.c
+++ b/drivers/scsi/scsi_pm.c
@@ -56,9 +56,6 @@ static int scsi_dev_type_suspend(struct device *dev,
 	const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 	int err;
 
-	/* flush pending in-flight resume operations, suspend is synchronous */
-	async_synchronize_full_domain(&scsi_sd_pm_domain);
-
 	err = scsi_device_quiesce(to_scsi_device(dev));
 	if (err == 0) {
 		err = cb(dev, pm);
@@ -123,48 +120,11 @@ scsi_bus_suspend_common(struct device *dev,
 	return err;
 }
 
-static void async_sdev_resume(void *dev, async_cookie_t cookie)
-{
-	scsi_dev_type_resume(dev, do_scsi_resume);
-}
-
-static void async_sdev_thaw(void *dev, async_cookie_t cookie)
-{
-	scsi_dev_type_resume(dev, do_scsi_thaw);
-}
-
-static void async_sdev_restore(void *dev, async_cookie_t cookie)
-{
-	scsi_dev_type_resume(dev, do_scsi_restore);
-}
-
 static int scsi_bus_resume_common(struct device *dev,
 		int (*cb)(struct device *, const struct dev_pm_ops *))
 {
-	async_func_t fn;
-
-	if (!scsi_is_sdev_device(dev))
-		fn = NULL;
-	else if (cb == do_scsi_resume)
-		fn = async_sdev_resume;
-	else if (cb == do_scsi_thaw)
-		fn = async_sdev_thaw;
-	else if (cb == do_scsi_restore)
-		fn = async_sdev_restore;
-	else
-		fn = NULL;
-
-	if (fn) {
-		async_schedule_domain(fn, dev, &scsi_sd_pm_domain);
-
-		/*
-		 * If a user has disabled async probing a likely reason
-		 * is due to a storage enclosure that does not inject
-		 * staggered spin-ups.  For safety, make resume
-		 * synchronous as well in that case.
-		 */
-		if (strncmp(scsi_scan_type, "async", 5) != 0)
-			async_synchronize_full_domain(&scsi_sd_pm_domain);
+	if (scsi_is_sdev_device(dev)) {
+		scsi_dev_type_resume(dev, cb);
 	} else {
 		pm_runtime_disable(dev);
 		pm_runtime_set_active(dev);
diff --git a/drivers/scsi/scsi_priv.h b/drivers/scsi/scsi_priv.h
index b531dec3d4206..2032db81897be 100644
--- a/drivers/scsi/scsi_priv.h
+++ b/drivers/scsi/scsi_priv.h
@@ -117,7 +117,7 @@ extern void scsi_exit_procfs(void);
 #endif /* CONFIG_PROC_FS */
 
 /* scsi_scan.c */
-extern char scsi_scan_type[];
+void scsi_enable_async_suspend(struct device *dev);
 extern int scsi_complete_async_scans(void);
 extern int scsi_scan_host_selected(struct Scsi_Host *, unsigned int,
 				   unsigned int, u64, enum scsi_scan_mode);
@@ -171,8 +171,6 @@ static inline int scsi_autopm_get_host(struct Scsi_Host *h) { return 0; }
 static inline void scsi_autopm_put_host(struct Scsi_Host *h) {}
 #endif /* CONFIG_PM */
 
-extern struct async_domain scsi_sd_pm_domain;
-
 /* scsi_dh.c */
 #ifdef CONFIG_SCSI_DH
 void scsi_dh_add_device(struct scsi_device *sdev);
diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
index 518aa152849ef..b80dd68d79e9d 100644
--- a/drivers/scsi/scsi_scan.c
+++ b/drivers/scsi/scsi_scan.c
@@ -122,6 +122,22 @@ struct async_scan_data {
 	struct completion prev_finished;
 };
 
+/**
+ * scsi_enable_async_suspend - Enable async suspend and resume
+ */
+void scsi_enable_async_suspend(struct device *dev)
+{
+	/*
+	 * If a user has disabled async probing a likely reason is due to a
+	 * storage enclosure that does not inject staggered spin-ups. For
+	 * safety, make resume synchronous as well in that case.
+	 */
+	if (strncmp(scsi_scan_type, "async", 5) != 0)
+		return;
+	/* Enable asynchronous suspend and resume. */
+	device_enable_async_suspend(dev);
+}
+
 /**
  * scsi_complete_async_scans - Wait for asynchronous scans to complete
  *
@@ -499,6 +515,7 @@ static struct scsi_target *scsi_alloc_target(struct device *parent,
 	dev_set_name(dev, "target%d:%d:%d", shost->host_no, channel, id);
 	dev->bus = &scsi_bus_type;
 	dev->type = &scsi_target_type;
+	scsi_enable_async_suspend(dev);
 	starget->id = id;
 	starget->channel = channel;
 	starget->can_queue = 0;
diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
index 7d3cbf4e6bc6e..b761c88f32dfe 100644
--- a/drivers/scsi/scsi_sysfs.c
+++ b/drivers/scsi/scsi_sysfs.c
@@ -1643,6 +1643,7 @@ void scsi_sysfs_device_initialize(struct scsi_device *sdev)
 	device_initialize(&sdev->sdev_gendev);
 	sdev->sdev_gendev.bus = &scsi_bus_type;
 	sdev->sdev_gendev.type = &scsi_dev_type;
+	scsi_enable_async_suspend(&sdev->sdev_gendev);
 	dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%llu",
 		     sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
 
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 1e887c11e83d0..f06cb6c5615a7 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -3505,7 +3505,6 @@ static int sd_remove(struct device *dev)
 	sdkp = dev_get_drvdata(dev);
 	scsi_autopm_get_device(sdkp->device);
 
-	async_synchronize_full_domain(&scsi_sd_pm_domain);
 	device_del(&sdkp->dev);
 	del_gendisk(sdkp->disk);
 	sd_shutdown(dev);
-- 
2.53.0