scsi: core: pm: Rely on the device driver core for async power management

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>

diff --git a/drivers/scsi/hosts.c b/drivers/scsi/hosts.c
index 3f6f14f..b836270 100644 (file)
--- a/drivers/scsi/hosts.c
+++ b/drivers/scsi/hosts.c
@@ -475,6 +475,7 @@ 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 b241f9e..ed9753f 100644 (file)
--- 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 3717eea..50b6bad 100644 (file)
--- 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 6d91520..2d9de5a 100644 (file)
--- a/drivers/scsi/scsi_priv.h
+++ b/drivers/scsi/scsi_priv.h
@@ -116,7 +116,7 @@ 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);
@@ -170,8 +170,6 @@ 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 0d0381d..c86152f 100644 (file)
--- 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
  *
@@ -454,6 +470,7 @@ 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 8679325..b598dfc 100644 (file)
--- a/drivers/scsi/scsi_sysfs.c
+++ b/drivers/scsi/scsi_sysfs.c
@@ -1616,6 +1616,7 @@ 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 5df665e..842b78b 100644 (file)
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -3504,7 +3504,6 @@ 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);