[PATCH] PM: runtime: Fix unpaired parent child_count for force_resume

[PATCH] PM: runtime: Fix unpaired parent child_count for force_resume

[Tony Lindgren]

As pm_runtime_need_not_resume() relies also on usage_count, it can return
a different value in pm_runtime_force_suspend() compared to when called in
pm_runtime_force_resume(). Different return values can happen if anything
calls PM runtime functions in between, and causes the parent child_count
to increase on every resume.

So far I've seen the issue only for omapdrm that does complicated things
with PM runtime calls during system suspend for legacy reasons:

omap_atomic_commit_tail() for omapdrm.0
 dispc_runtime_get()
  wakes up 58000000.dss as it's the dispc parent
   dispc_runtime_resume()
    rpm_resume() increases parent child_count
 dispc_runtime_put() won't idle, PM runtime suspend blocked
pm_runtime_force_suspend() for 58000000.dss, !pm_runtime_need_not_resume()
 __update_runtime_status()
system suspended
pm_runtime_force_resume() for 58000000.dss, pm_runtime_need_not_resume()
 pm_runtime_enable() only called because of pm_runtime_need_not_resume()
omap_atomic_commit_tail() for omapdrm.0
 dispc_runtime_get()
  wakes up 58000000.dss as it's the dispc parent
   dispc_runtime_resume()
    rpm_resume() increases parent child_count
 dispc_runtime_put() won't idle, PM runtime suspend blocked
...
rpm_suspend for 58000000.dss but parent child_count is now unbalanced

Let's fix the issue by adding a flag for needs_force_resume and use it in
pm_runtime_force_resume() instead of pm_runtime_need_not_resume().

Additionally omapdrm system suspend could be simplified later on to avoid
lots of unnecessary PM runtime calls and the complexity it adds. The
driver can just use internal functions that are shared between the PM
runtime and system suspend related functions.

Fixes: 4918e1f87c5f ("PM / runtime: Rework pm_runtime_force_suspend/resume()")
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Sebastian Reichel <sebastian.reichel@collabora.com>
Cc: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
---
 drivers/base/power/runtime.c | 10 +++++++---
 include/linux/pm.h           |  1 +
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
--- a/drivers/base/power/runtime.c
+++ b/drivers/base/power/runtime.c
@@ -1637,6 +1637,7 @@ void pm_runtime_init(struct device *dev)
 	dev->power.request_pending = false;
 	dev->power.request = RPM_REQ_NONE;
 	dev->power.deferred_resume = false;
+	dev->power.needs_force_resume = 0;
 	INIT_WORK(&dev->power.work, pm_runtime_work);
 
 	dev->power.timer_expires = 0;
@@ -1804,10 +1805,12 @@ int pm_runtime_force_suspend(struct device *dev)
 	 * its parent, but set its status to RPM_SUSPENDED anyway in case this
 	 * function will be called again for it in the meantime.
 	 */
-	if (pm_runtime_need_not_resume(dev))
+	if (pm_runtime_need_not_resume(dev)) {
 		pm_runtime_set_suspended(dev);
-	else
+	} else {
 		__update_runtime_status(dev, RPM_SUSPENDED);
+		dev->power.needs_force_resume = 1;
+	}
 
 	return 0;
 
@@ -1834,7 +1837,7 @@ int pm_runtime_force_resume(struct device *dev)
 	int (*callback)(struct device *);
 	int ret = 0;
 
-	if (!pm_runtime_status_suspended(dev) || pm_runtime_need_not_resume(dev))
+	if (!pm_runtime_status_suspended(dev) || !dev->power.needs_force_resume)
 		goto out;
 
 	/*
@@ -1853,6 +1856,7 @@ int pm_runtime_force_resume(struct device *dev)
 
 	pm_runtime_mark_last_busy(dev);
 out:
+	dev->power.needs_force_resume = 0;
 	pm_runtime_enable(dev);
 	return ret;
 }
diff --git a/include/linux/pm.h b/include/linux/pm.h
--- a/include/linux/pm.h
+++ b/include/linux/pm.h
@@ -602,6 +602,7 @@ struct dev_pm_info {
 	unsigned int		idle_notification:1;
 	unsigned int		request_pending:1;
 	unsigned int		deferred_resume:1;
+	unsigned int		needs_force_resume:1;
 	unsigned int		runtime_auto:1;
 	bool			ignore_children:1;
 	unsigned int		no_callbacks:1;
-- 
2.31.1

Re: [PATCH] PM: runtime: Fix unpaired parent child_count for force_resume

[Ulf Hansson]

On Wed, 5 May 2021 at 13:09, Tony Lindgren <tony@atomide.com> wrote:
>
> As pm_runtime_need_not_resume() relies also on usage_count, it can return
> a different value in pm_runtime_force_suspend() compared to when called in
> pm_runtime_force_resume(). Different return values can happen if anything
> calls PM runtime functions in between, and causes the parent child_count
> to increase on every resume.
>
> So far I've seen the issue only for omapdrm that does complicated things
> with PM runtime calls during system suspend for legacy reasons:
>
> omap_atomic_commit_tail() for omapdrm.0
>  dispc_runtime_get()
>   wakes up 58000000.dss as it's the dispc parent
>    dispc_runtime_resume()
>     rpm_resume() increases parent child_count
>  dispc_runtime_put() won't idle, PM runtime suspend blocked
> pm_runtime_force_suspend() for 58000000.dss, !pm_runtime_need_not_resume()
>  __update_runtime_status()
> system suspended
> pm_runtime_force_resume() for 58000000.dss, pm_runtime_need_not_resume()
>  pm_runtime_enable() only called because of pm_runtime_need_not_resume()
> omap_atomic_commit_tail() for omapdrm.0
>  dispc_runtime_get()
>   wakes up 58000000.dss as it's the dispc parent
>    dispc_runtime_resume()
>     rpm_resume() increases parent child_count
>  dispc_runtime_put() won't idle, PM runtime suspend blocked
> ...
> rpm_suspend for 58000000.dss but parent child_count is now unbalanced
>
> Let's fix the issue by adding a flag for needs_force_resume and use it in
> pm_runtime_force_resume() instead of pm_runtime_need_not_resume().

Thanks for sharing the details, much appreciated.

>
> Additionally omapdrm system suspend could be simplified later on to avoid
> lots of unnecessary PM runtime calls and the complexity it adds. The
> driver can just use internal functions that are shared between the PM
> runtime and system suspend related functions.
>
> Fixes: 4918e1f87c5f ("PM / runtime: Rework pm_runtime_force_suspend/resume()")

Actually, I think the problem has been there from the beginning
(unless I am mistaken), when we introduced the functions. So maybe the
fixes tag isn't entirely correct.

Although, I certainly think we should tag this for stable kernels.

> Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> Cc: Sebastian Reichel <sebastian.reichel@collabora.com>
> Cc: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
> Signed-off-by: Tony Lindgren <tony@atomide.com>

Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>

Kind regards
Uffe

> ---
>  drivers/base/power/runtime.c | 10 +++++++---
>  include/linux/pm.h           |  1 +
>  2 files changed, 8 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
> --- a/drivers/base/power/runtime.c
> +++ b/drivers/base/power/runtime.c
> @@ -1637,6 +1637,7 @@ void pm_runtime_init(struct device *dev)
>         dev->power.request_pending = false;
>         dev->power.request = RPM_REQ_NONE;
>         dev->power.deferred_resume = false;
> +       dev->power.needs_force_resume = 0;
>         INIT_WORK(&dev->power.work, pm_runtime_work);
>
>         dev->power.timer_expires = 0;
> @@ -1804,10 +1805,12 @@ int pm_runtime_force_suspend(struct device *dev)
>          * its parent, but set its status to RPM_SUSPENDED anyway in case this
>          * function will be called again for it in the meantime.
>          */
> -       if (pm_runtime_need_not_resume(dev))
> +       if (pm_runtime_need_not_resume(dev)) {
>                 pm_runtime_set_suspended(dev);
> -       else
> +       } else {
>                 __update_runtime_status(dev, RPM_SUSPENDED);
> +               dev->power.needs_force_resume = 1;
> +       }
>
>         return 0;
>
> @@ -1834,7 +1837,7 @@ int pm_runtime_force_resume(struct device *dev)
>         int (*callback)(struct device *);
>         int ret = 0;
>
> -       if (!pm_runtime_status_suspended(dev) || pm_runtime_need_not_resume(dev))
> +       if (!pm_runtime_status_suspended(dev) || !dev->power.needs_force_resume)
>                 goto out;
>
>         /*
> @@ -1853,6 +1856,7 @@ int pm_runtime_force_resume(struct device *dev)
>
>         pm_runtime_mark_last_busy(dev);
>  out:
> +       dev->power.needs_force_resume = 0;
>         pm_runtime_enable(dev);
>         return ret;
>  }
> diff --git a/include/linux/pm.h b/include/linux/pm.h
> --- a/include/linux/pm.h
> +++ b/include/linux/pm.h
> @@ -602,6 +602,7 @@ struct dev_pm_info {
>         unsigned int            idle_notification:1;
>         unsigned int            request_pending:1;
>         unsigned int            deferred_resume:1;
> +       unsigned int            needs_force_resume:1;
>         unsigned int            runtime_auto:1;
>         bool                    ignore_children:1;
>         unsigned int            no_callbacks:1;
> --
> 2.31.1

Re: [PATCH] PM: runtime: Fix unpaired parent child_count for force_resume

[Tomi Valkeinen]

On 05/05/2021 14:09, Tony Lindgren wrote:
> As pm_runtime_need_not_resume() relies also on usage_count, it can return
> a different value in pm_runtime_force_suspend() compared to when called in
> pm_runtime_force_resume(). Different return values can happen if anything
> calls PM runtime functions in between, and causes the parent child_count
> to increase on every resume.
> 
> So far I've seen the issue only for omapdrm that does complicated things
> with PM runtime calls during system suspend for legacy reasons:
> 
> omap_atomic_commit_tail() for omapdrm.0
>   dispc_runtime_get()
>    wakes up 58000000.dss as it's the dispc parent
>     dispc_runtime_resume()
>      rpm_resume() increases parent child_count
>   dispc_runtime_put() won't idle, PM runtime suspend blocked
> pm_runtime_force_suspend() for 58000000.dss, !pm_runtime_need_not_resume()
>   __update_runtime_status()
> system suspended
> pm_runtime_force_resume() for 58000000.dss, pm_runtime_need_not_resume()
>   pm_runtime_enable() only called because of pm_runtime_need_not_resume()
> omap_atomic_commit_tail() for omapdrm.0
>   dispc_runtime_get()
>    wakes up 58000000.dss as it's the dispc parent
>     dispc_runtime_resume()
>      rpm_resume() increases parent child_count
>   dispc_runtime_put() won't idle, PM runtime suspend blocked
> ...
> rpm_suspend for 58000000.dss but parent child_count is now unbalanced
> 
> Let's fix the issue by adding a flag for needs_force_resume and use it in
> pm_runtime_force_resume() instead of pm_runtime_need_not_resume().
> 
> Additionally omapdrm system suspend could be simplified later on to avoid
> lots of unnecessary PM runtime calls and the complexity it adds. The
> driver can just use internal functions that are shared between the PM
> runtime and system suspend related functions.
> 
> Fixes: 4918e1f87c5f ("PM / runtime: Rework pm_runtime_force_suspend/resume()")
> Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> Cc: Sebastian Reichel <sebastian.reichel@collabora.com>
> Cc: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
> Signed-off-by: Tony Lindgren <tony@atomide.com>
> ---
>   drivers/base/power/runtime.c | 10 +++++++---
>   include/linux/pm.h           |  1 +
>   2 files changed, 8 insertions(+), 3 deletions(-)

Tested on DRA76 EVM, with and without HDMI plugged in. I can see DSS 
shutting down properly by looking at the CM_DSS_DSS_CLKCTRL register.

Tested-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>

  Tomi

Re: [PATCH] PM: runtime: Fix unpaired parent child_count for force_resume

[Rafael J. Wysocki]

On Fri, May 7, 2021 at 2:04 PM Ulf Hansson <ulf.hansson@linaro.org> wrote:
>
> On Wed, 5 May 2021 at 13:09, Tony Lindgren <tony@atomide.com> wrote:
> >
> > As pm_runtime_need_not_resume() relies also on usage_count, it can return
> > a different value in pm_runtime_force_suspend() compared to when called in
> > pm_runtime_force_resume(). Different return values can happen if anything
> > calls PM runtime functions in between, and causes the parent child_count
> > to increase on every resume.
> >
> > So far I've seen the issue only for omapdrm that does complicated things
> > with PM runtime calls during system suspend for legacy reasons:
> >
> > omap_atomic_commit_tail() for omapdrm.0
> >  dispc_runtime_get()
> >   wakes up 58000000.dss as it's the dispc parent
> >    dispc_runtime_resume()
> >     rpm_resume() increases parent child_count
> >  dispc_runtime_put() won't idle, PM runtime suspend blocked
> > pm_runtime_force_suspend() for 58000000.dss, !pm_runtime_need_not_resume()
> >  __update_runtime_status()
> > system suspended
> > pm_runtime_force_resume() for 58000000.dss, pm_runtime_need_not_resume()
> >  pm_runtime_enable() only called because of pm_runtime_need_not_resume()
> > omap_atomic_commit_tail() for omapdrm.0
> >  dispc_runtime_get()
> >   wakes up 58000000.dss as it's the dispc parent
> >    dispc_runtime_resume()
> >     rpm_resume() increases parent child_count
> >  dispc_runtime_put() won't idle, PM runtime suspend blocked
> > ...
> > rpm_suspend for 58000000.dss but parent child_count is now unbalanced
> >
> > Let's fix the issue by adding a flag for needs_force_resume and use it in
> > pm_runtime_force_resume() instead of pm_runtime_need_not_resume().
>
> Thanks for sharing the details, much appreciated.
>
> >
> > Additionally omapdrm system suspend could be simplified later on to avoid
> > lots of unnecessary PM runtime calls and the complexity it adds. The
> > driver can just use internal functions that are shared between the PM
> > runtime and system suspend related functions.
> >
> > Fixes: 4918e1f87c5f ("PM / runtime: Rework pm_runtime_force_suspend/resume()")
>
> Actually, I think the problem has been there from the beginning
> (unless I am mistaken), when we introduced the functions. So maybe the
> fixes tag isn't entirely correct.

It kind of make sense to point to the last commit that touched this
code and didn't address the issue.

> Although, I certainly think we should tag this for stable kernels.
>
> > Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> > Cc: Sebastian Reichel <sebastian.reichel@collabora.com>
> > Cc: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
> > Signed-off-by: Tony Lindgren <tony@atomide.com>
>
> Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>

Applied as 5.13-rc material, thanks!

> > ---
> >  drivers/base/power/runtime.c | 10 +++++++---
> >  include/linux/pm.h           |  1 +
> >  2 files changed, 8 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
> > --- a/drivers/base/power/runtime.c
> > +++ b/drivers/base/power/runtime.c
> > @@ -1637,6 +1637,7 @@ void pm_runtime_init(struct device *dev)
> >         dev->power.request_pending = false;
> >         dev->power.request = RPM_REQ_NONE;
> >         dev->power.deferred_resume = false;
> > +       dev->power.needs_force_resume = 0;
> >         INIT_WORK(&dev->power.work, pm_runtime_work);
> >
> >         dev->power.timer_expires = 0;
> > @@ -1804,10 +1805,12 @@ int pm_runtime_force_suspend(struct device *dev)
> >          * its parent, but set its status to RPM_SUSPENDED anyway in case this
> >          * function will be called again for it in the meantime.
> >          */
> > -       if (pm_runtime_need_not_resume(dev))
> > +       if (pm_runtime_need_not_resume(dev)) {
> >                 pm_runtime_set_suspended(dev);
> > -       else
> > +       } else {
> >                 __update_runtime_status(dev, RPM_SUSPENDED);
> > +               dev->power.needs_force_resume = 1;
> > +       }
> >
> >         return 0;
> >
> > @@ -1834,7 +1837,7 @@ int pm_runtime_force_resume(struct device *dev)
> >         int (*callback)(struct device *);
> >         int ret = 0;
> >
> > -       if (!pm_runtime_status_suspended(dev) || pm_runtime_need_not_resume(dev))
> > +       if (!pm_runtime_status_suspended(dev) || !dev->power.needs_force_resume)
> >                 goto out;
> >
> >         /*
> > @@ -1853,6 +1856,7 @@ int pm_runtime_force_resume(struct device *dev)
> >
> >         pm_runtime_mark_last_busy(dev);
> >  out:
> > +       dev->power.needs_force_resume = 0;
> >         pm_runtime_enable(dev);
> >         return ret;
> >  }
> > diff --git a/include/linux/pm.h b/include/linux/pm.h
> > --- a/include/linux/pm.h
> > +++ b/include/linux/pm.h
> > @@ -602,6 +602,7 @@ struct dev_pm_info {
> >         unsigned int            idle_notification:1;
> >         unsigned int            request_pending:1;
> >         unsigned int            deferred_resume:1;
> > +       unsigned int            needs_force_resume:1;
> >         unsigned int            runtime_auto:1;
> >         bool                    ignore_children:1;
> >         unsigned int            no_callbacks:1;
> > --
> > 2.31.1