Commit cb7e6f05fce67c965194ac04467e1ba7bc70b069 ("scsi: ufs: core: Enable
power management for wlun") makes UFS device W-LU scsi device the supplier
and the others as consumers. If the supplier's runtime pm ops fails or has
failed, not only supplier has the error saved to dev->power.runtime_error,
the error may (most likely) be saved by one or more consumers, see also
rpm_get_suppliers(). Update ufshcd_recover_pm_error() accordingly to clear
the runtime_error of the supplier and its consumers to get runtime PM back
to work on them.
Signed-off-by: Can Guo <cang@xxxxxxxxxxxxxx>
---
drivers/scsi/ufs/ufshcd.c | 49 ++++++++++++++++++++---------------------------
1 file changed, 21 insertions(+), 28 deletions(-)
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 301304b..5e6e3ac 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -242,6 +242,7 @@ static irqreturn_t ufshcd_intr(int irq, void *__hba);
static int ufshcd_change_power_mode(struct ufs_hba *hba,
struct ufs_pa_layer_attr *pwr_mode);
static void ufshcd_schedule_eh_work(struct ufs_hba *hba);
+static void ufshcd_recover_pm_error(struct ufs_hba *hba);
static int ufshcd_setup_hba_vreg(struct ufs_hba *hba, bool on);
static int ufshcd_setup_vreg(struct ufs_hba *hba, bool on);
static inline int ufshcd_config_vreg_hpm(struct ufs_hba *hba,
@@ -5951,12 +5952,14 @@ static int ufshcd_err_handling_prepare(struct ufs_hba *hba)
return 0;
}
-static void ufshcd_err_handling_unprepare(struct ufs_hba *hba)
+static void ufshcd_err_handling_unprepare(struct ufs_hba *hba, int reset_err)
{
ufshcd_scsi_unblock_requests(hba);
ufshcd_release(hba);
if (ufshcd_is_clkscaling_supported(hba))
ufshcd_clk_scaling_suspend(hba, false);
+ if (!reset_err)
+ ufshcd_recover_pm_error(hba);
ufshcd_clear_ua_wluns(hba);
ufshcd_rpm_put(hba);
pm_runtime_put(hba->dev);
@@ -5975,34 +5978,26 @@ static inline bool ufshcd_err_handling_should_stop(struct ufs_hba *hba)
static void ufshcd_recover_pm_error(struct ufs_hba *hba)
{
struct Scsi_Host *shost = hba->host;
- struct scsi_device *sdev;
- struct request_queue *q;
+ struct scsi_device *sdev = hba->sdev_ufs_device;
+ struct scsi_target *starget = sdev->sdev_target;
int ret;
hba->is_wl_sys_suspended = false;
- /*
- * Set RPM status of wlun device to RPM_ACTIVE,
- * this also clears its runtime error.
- */
- ret = pm_runtime_set_active(&hba->sdev_ufs_device->sdev_gendev);
- /* hba device might have a runtime error otherwise */
- if (ret)
- ret = pm_runtime_set_active(hba->dev);
- /*
- * If wlun device had runtime error, we also need to resume those
- * consumer scsi devices in case any of them has failed to be
- * resumed due to supplier runtime resume failure. This is to unblock
- * blk_queue_enter in case there are bios waiting inside it.
- */
- if (!ret) {
- shost_for_each_device(sdev, shost) {
- q = sdev->request_queue;
- if (q->dev && (q->rpm_status == RPM_SUSPENDED ||
- q->rpm_status == RPM_SUSPENDING))
- pm_request_resume(q->dev);
- }
+ /* Resume parent/target to clear path for pm_runtime_set_active() */
+ pm_runtime_get_sync(&starget->dev);
+ shost_for_each_device(sdev, shost) {
+ struct device *dev = &sdev->sdev_gendev;
+
+ pm_runtime_get_sync(dev);
+ /* Clear saved dev->power.runtime_error */
+ ret = pm_runtime_set_active(dev);
+ if (!ret)
+ /* runtime_error cleared, kick blk_queue_enter() */
+ blk_set_runtime_active(sdev->request_queue);
+ pm_runtime_put(dev);
}
+ pm_runtime_put(&starget->dev);
}
#else
static inline void ufshcd_recover_pm_error(struct ufs_hba *hba)
@@ -6036,7 +6031,7 @@ static void ufshcd_err_handler(struct work_struct *work)
unsigned long flags;
bool err_xfer = false;
bool err_tm = false;
- int err = 0, pmc_err;
+ int err = -1, pmc_err;
int tag;
bool needs_reset = false, needs_restore = false;
@@ -6189,8 +6184,6 @@ static void ufshcd_err_handler(struct work_struct *work)
if (err)
dev_err(hba->dev, "%s: reset and restore failed with err %d\n",
__func__, err);
- else
- ufshcd_recover_pm_error(hba);
spin_lock_irqsave(hba->host->host_lock, flags);
}
@@ -6204,7 +6197,7 @@ static void ufshcd_err_handler(struct work_struct *work)
}
ufshcd_clear_eh_in_progress(hba);
spin_unlock_irqrestore(hba->host->host_lock, flags);
- ufshcd_err_handling_unprepare(hba);
+ ufshcd_err_handling_unprepare(hba, err);
up(&hba->host_sem);
}
--
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