* [PATCH v2 1/3] scsi: ufs: Do not put UFS power into LPM if link is broken
2021-04-26 3:48 ` [PATCH v2 0/3] Three minor fixes w.r.t suspend/resume Can Guo
@ 2021-04-26 3:48 ` Can Guo
2021-04-26 3:48 ` [PATCH v2 2/3] scsi: ufs: Cancel rpm_dev_flush_recheck_work during system suspend Can Guo
` (3 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: Can Guo @ 2021-04-26 3:48 UTC (permalink / raw)
To: asutoshd, ziqichen, nguyenb, hongwus, linux-scsi, kernel-team,
cang
Cc: Alim Akhtar, Avri Altman, James E.J. Bottomley,
Martin K. Petersen, Stanley Chu, Bean Huo, Jaegeuk Kim, open list
During resume, if link is broken due to AH8 failure, make sure
ufshcd_resume() do not put UFS power back into LPM.
Fixes: 4db7a23605973 ("scsi: ufs: Fix concurrency of error handler and other error recovery paths")
Signed-off-by: Can Guo <cang@codeaurora.org>
---
drivers/scsi/ufs/ufshcd.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 6da1da8..28501bb 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -8660,7 +8660,7 @@ static void ufshcd_vreg_set_lpm(struct ufs_hba *hba)
} else if (!ufshcd_is_ufs_dev_active(hba)) {
ufshcd_toggle_vreg(hba->dev, hba->vreg_info.vcc, false);
vcc_off = true;
- if (!ufshcd_is_link_active(hba)) {
+ if (ufshcd_is_link_hibern8(hba) || ufshcd_is_link_off(hba)) {
ufshcd_config_vreg_lpm(hba, hba->vreg_info.vccq);
ufshcd_config_vreg_lpm(hba, hba->vreg_info.vccq2);
}
@@ -8682,7 +8682,7 @@ static int ufshcd_vreg_set_hpm(struct ufs_hba *hba)
!hba->dev_info.is_lu_power_on_wp) {
ret = ufshcd_setup_vreg(hba, true);
} else if (!ufshcd_is_ufs_dev_active(hba)) {
- if (!ret && !ufshcd_is_link_active(hba)) {
+ if (!ufshcd_is_link_active(hba)) {
ret = ufshcd_config_vreg_hpm(hba, hba->vreg_info.vccq);
if (ret)
goto vcc_disable;
--
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.
^ permalink raw reply related [flat|nested] 6+ messages in thread* [PATCH v2 2/3] scsi: ufs: Cancel rpm_dev_flush_recheck_work during system suspend
2021-04-26 3:48 ` [PATCH v2 0/3] Three minor fixes w.r.t suspend/resume Can Guo
2021-04-26 3:48 ` [PATCH v2 1/3] scsi: ufs: Do not put UFS power into LPM if link is broken Can Guo
@ 2021-04-26 3:48 ` Can Guo
2021-04-26 3:48 ` [PATCH v2 3/3] scsi: ufs: Narrow down fast pass in system suspend path Can Guo
` (2 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: Can Guo @ 2021-04-26 3:48 UTC (permalink / raw)
To: asutoshd, ziqichen, nguyenb, hongwus, linux-scsi, kernel-team,
cang
Cc: Alim Akhtar, Avri Altman, James E.J. Bottomley,
Martin K. Petersen, Stanley Chu, Bean Huo, Jaegeuk Kim, open list
During ufs system suspend, leaving rpm_dev_flush_recheck_work running or
pending is risky, because concurrency may happen btw system suspend/resume
and runtime resume routine. Fix it by cancelling rpm_dev_flush_recheck_work
synchronously during system suspend.
Fixes: 51dd905bd2f61 ("scsi: ufs: Fix WriteBooster flush during runtime suspend")
Signed-off-by: Can Guo <cang@codeaurora.org>
---
drivers/scsi/ufs/ufshcd.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 28501bb..a2f9c8e 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -9044,6 +9044,8 @@ int ufshcd_system_suspend(struct ufs_hba *hba)
if (!hba->is_powered)
return 0;
+ cancel_delayed_work_sync(&hba->rpm_dev_flush_recheck_work);
+
if ((ufs_get_pm_lvl_to_dev_pwr_mode(hba->spm_lvl) ==
hba->curr_dev_pwr_mode) &&
(ufs_get_pm_lvl_to_link_pwr_state(hba->spm_lvl) ==
--
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.
^ permalink raw reply related [flat|nested] 6+ messages in thread* [PATCH v2 3/3] scsi: ufs: Narrow down fast pass in system suspend path
2021-04-26 3:48 ` [PATCH v2 0/3] Three minor fixes w.r.t suspend/resume Can Guo
2021-04-26 3:48 ` [PATCH v2 1/3] scsi: ufs: Do not put UFS power into LPM if link is broken Can Guo
2021-04-26 3:48 ` [PATCH v2 2/3] scsi: ufs: Cancel rpm_dev_flush_recheck_work during system suspend Can Guo
@ 2021-04-26 3:48 ` Can Guo
2021-04-26 5:47 ` [PATCH v2 0/3] Three minor fixes w.r.t suspend/resume Daejun Park
2021-04-29 3:18 ` Martin K. Petersen
4 siblings, 0 replies; 6+ messages in thread
From: Can Guo @ 2021-04-26 3:48 UTC (permalink / raw)
To: asutoshd, ziqichen, nguyenb, hongwus, linux-scsi, kernel-team,
cang
Cc: Alim Akhtar, Avri Altman, James E.J. Bottomley,
Martin K. Petersen, Stanley Chu, Bean Huo, Jaegeuk Kim,
Gilad Broner, Subhash Jadavani, open list
If spm_lvl is set to 0 or 1, when system suspend kicks start and hba is
runtime active, system suspend may just bail without doing anything (the
fast pass), leaving other contexts still running, e.g., clock gating and
clock scaling. When system resume kicks start, concurrency can happen btw
ufshcd_resume() and these contexts, leading to various stability issues.
Fix it by adding a check against hba's runtime status and allowing fast
pass only if hba is runtime suspended, otherwise let system suspend go
ahead call ufshcd_suspend(). This can guarantee that these contexts are
stopped by either runtime suspend or system suspend.
Fixes: 0b257734344aa ("scsi: ufs: optimize system suspend handling")
Signed-off-by: Can Guo <cang@codeaurora.org>
---
drivers/scsi/ufs/ufshcd.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index a2f9c8e..c480f88 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -9050,6 +9050,7 @@ int ufshcd_system_suspend(struct ufs_hba *hba)
hba->curr_dev_pwr_mode) &&
(ufs_get_pm_lvl_to_link_pwr_state(hba->spm_lvl) ==
hba->uic_link_state) &&
+ pm_runtime_suspended(hba->dev) &&
!hba->dev_info.b_rpm_dev_flush_capable)
goto out;
--
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.
^ permalink raw reply related [flat|nested] 6+ messages in thread* RE: [PATCH v2 0/3] Three minor fixes w.r.t suspend/resume
2021-04-26 3:48 ` [PATCH v2 0/3] Three minor fixes w.r.t suspend/resume Can Guo
` (2 preceding siblings ...)
2021-04-26 3:48 ` [PATCH v2 3/3] scsi: ufs: Narrow down fast pass in system suspend path Can Guo
@ 2021-04-26 5:47 ` Daejun Park
2021-04-29 3:18 ` Martin K. Petersen
4 siblings, 0 replies; 6+ messages in thread
From: Daejun Park @ 2021-04-26 5:47 UTC (permalink / raw)
To: asutoshd@codeaurora.org, ziqichen@codeaurora.org,
nguyenb@codeaurora.org, hongwus@codeaurora.org,
linux-scsi@vger.kernel.org, kernel-team@android.com,
cang@codeaurora.org
Hi Can Guo,
>1st change can fix a possible OCP issue when AH8 error happens.
>2nd and 3rd change can fix race conditions btw suspend/resume and other contexts.
>
>Can Guo (3):
> scsi: ufs: Do not put UFS power into LPM if link is broken
> scsi: ufs: Cancel rpm_dev_flush_recheck_work during system suspend
> scsi: ufs: Narrow down fast pass in system suspend path
>
>Change since V1:
>- Incorporated Daejun's comment.
>
> drivers/scsi/ufs/ufshcd.c | 7 +++++--
> 1 file changed, 5 insertions(+), 2 deletions(-)
>
This series looks good to me.
Reviewed-by: Daejun Park <daejun7.park@samsung.com>
Thanks,
Daejun
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [PATCH v2 0/3] Three minor fixes w.r.t suspend/resume
2021-04-26 3:48 ` [PATCH v2 0/3] Three minor fixes w.r.t suspend/resume Can Guo
` (3 preceding siblings ...)
2021-04-26 5:47 ` [PATCH v2 0/3] Three minor fixes w.r.t suspend/resume Daejun Park
@ 2021-04-29 3:18 ` Martin K. Petersen
4 siblings, 0 replies; 6+ messages in thread
From: Martin K. Petersen @ 2021-04-29 3:18 UTC (permalink / raw)
To: linux-scsi, Can Guo, asutoshd, nguyenb, hongwus, kernel-team,
ziqichen
Cc: Martin K . Petersen
On Sun, 25 Apr 2021 20:48:37 -0700, Can Guo wrote:
> 1st change can fix a possible OCP issue when AH8 error happens.
> 2nd and 3rd change can fix race conditions btw suspend/resume and other contexts.
>
> Can Guo (3):
> scsi: ufs: Do not put UFS power into LPM if link is broken
> scsi: ufs: Cancel rpm_dev_flush_recheck_work during system suspend
> scsi: ufs: Narrow down fast pass in system suspend path
>
> [...]
Applied to 5.13/scsi-fixes, thanks!
[1/3] scsi: ufs: Do not put UFS power into LPM if link is broken
https://git.kernel.org/mkp/scsi/c/23043dd87b15
[2/3] scsi: ufs: Cancel rpm_dev_flush_recheck_work during system suspend
https://git.kernel.org/mkp/scsi/c/637822e63b79
[3/3] scsi: ufs: Narrow down fast pass in system suspend path
https://git.kernel.org/mkp/scsi/c/ce4f62f9dd8c
--
Martin K. Petersen Oracle Linux Engineering
^ permalink raw reply [flat|nested] 6+ messages in thread