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PM / Domains: Fix initial default state of the need_restore flag
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The initial state of the device's need_restore flag should'nt depend on
the current state of the PM domain. For example it should be perfectly
valid to attach an inactive device to a powered PM domain.

The pm_genpd_dev_need_restore() API allow us to update the need_restore
flag to somewhat cope with such scenarios. Typically that should have
been done from drivers/buses ->probe() since it's those that put the
requirements on the value of the need_restore flag.

Until recently, the Exynos SOCs were the only user of the
pm_genpd_dev_need_restore() API, though invoking it from a centralized
location while adding devices to their PM domains.

Due to that Exynos now have swithed to the generic OF-based PM domain
look-up, it's no longer possible to invoke the API from a centralized
location. The reason is because devices are now added to their PM
domains during the probe sequence.

Commit "ARM: exynos: Move to generic PM domain DT bindings"
did the switch for Exynos to the generic OF-based PM domain look-up,
but it also removed the call to pm_genpd_dev_need_restore(). This
caused a regression for some of the Exynos drivers.

To handle things more properly in the generic PM domain, let's change
the default initial value of the need_restore flag to reflect that the
state is unknown. As soon as some of the runtime PM callbacks gets
invoked, update the initial value accordingly.

Moreover, since the generic PM domain is verifying that all devices
are both runtime PM enabled and suspended, using pm_runtime_suspended()
while pm_genpd_poweroff() is invoked from the scheduled work, we can be
sure of that the PM domain won't be powering off while having active
devices.

Do note that, the generic PM domain can still only know about active
devices which has been activated through invoking its runtime PM resume
callback. In other words, buses/drivers using pm_runtime_set_active()
during ->probe() will still suffer from a race condition, potentially
probing a device without having its PM domain being powered. That issue
will have to be solved using a different approach.

This a log from the boot regression for Exynos5, which is being fixed in
this patch.

------------[ cut here ]------------
WARNING: CPU: 0 PID: 308 at ../drivers/clk/clk.c:851 clk_disable+0x24/0x30()
Modules linked in:
CPU: 0 PID: 308 Comm: kworker/0:1 Not tainted 3.18.0-rc3-00569-gbd9449f-dirty #10
Workqueue: pm pm_runtime_work
[<c0013c64>] (unwind_backtrace) from [<c0010dec>] (show_stack+0x10/0x14)
[<c0010dec>] (show_stack) from [<c03ee4cc>] (dump_stack+0x70/0xbc)
[<c03ee4cc>] (dump_stack) from [<c0020d34>] (warn_slowpath_common+0x64/0x88)
[<c0020d34>] (warn_slowpath_common) from [<c0020d74>] (warn_slowpath_null+0x1c/0x24)
[<c0020d74>] (warn_slowpath_null) from [<c03107b0>] (clk_disable+0x24/0x30)
[<c03107b0>] (clk_disable) from [<c02cc834>] (gsc_runtime_suspend+0x128/0x160)
[<c02cc834>] (gsc_runtime_suspend) from [<c0249024>] (pm_generic_runtime_suspend+0x2c/0x38)
[<c0249024>] (pm_generic_runtime_suspend) from [<c024f44c>] (pm_genpd_default_save_state+0x2c/0x8c)
[<c024f44c>] (pm_genpd_default_save_state) from [<c024ff2c>] (pm_genpd_poweroff+0x224/0x3ec)
[<c024ff2c>] (pm_genpd_poweroff) from [<c02501b4>] (pm_genpd_runtime_suspend+0x9c/0xcc)
[<c02501b4>] (pm_genpd_runtime_suspend) from [<c024a4f8>] (__rpm_callback+0x2c/0x60)
[<c024a4f8>] (__rpm_callback) from [<c024a54c>] (rpm_callback+0x20/0x74)
[<c024a54c>] (rpm_callback) from [<c024a930>] (rpm_suspend+0xd4/0x43c)
[<c024a930>] (rpm_suspend) from [<c024bbcc>] (pm_runtime_work+0x80/0x90)
[<c024bbcc>] (pm_runtime_work) from [<c0032a9c>] (process_one_work+0x12c/0x314)
[<c0032a9c>] (process_one_work) from [<c0032cf4>] (worker_thread+0x3c/0x4b0)
[<c0032cf4>] (worker_thread) from [<c003747c>] (kthread+0xcc/0xe8)
[<c003747c>] (kthread) from [<c000e738>] (ret_from_fork+0x14/0x3c)
---[ end trace 40cd58bcd6988f12 ]---

Fixes: a4a8c2c (ARM: exynos: Move to generic PM domain DT bindings)
Reported-and-tested0by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Reviewed-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Reviewed-by: Kevin Hilman <khilman@linaro.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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@storulf @rafaeljw
storulf authored and rafaeljw committed Nov 11, 2014
1 parent c16561e commit 67732cd
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Showing 2 changed files with 33 additions and 7 deletions.
38 changes: 32 additions & 6 deletions drivers/base/power/domain.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -361,9 +361,19 @@ static int __pm_genpd_save_device(struct pm_domain_data *pdd,
struct device *dev = pdd->dev;
int ret = 0;

if (gpd_data->need_restore)
if (gpd_data->need_restore > 0)
return 0;

/*
* If the value of the need_restore flag is still unknown at this point,
* we trust that pm_genpd_poweroff() has verified that the device is
* already runtime PM suspended.
*/
if (gpd_data->need_restore < 0) {
gpd_data->need_restore = 1;
return 0;
}

mutex_unlock(&genpd->lock);

genpd_start_dev(genpd, dev);
Expand All @@ -373,7 +383,7 @@ static int __pm_genpd_save_device(struct pm_domain_data *pdd,
mutex_lock(&genpd->lock);

if (!ret)
gpd_data->need_restore = true;
gpd_data->need_restore = 1;

return ret;
}
Expand All @@ -389,12 +399,17 @@ static void __pm_genpd_restore_device(struct pm_domain_data *pdd,
{
struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd);
struct device *dev = pdd->dev;
bool need_restore = gpd_data->need_restore;
int need_restore = gpd_data->need_restore;

gpd_data->need_restore = false;
gpd_data->need_restore = 0;
mutex_unlock(&genpd->lock);

genpd_start_dev(genpd, dev);

/*
* Call genpd_restore_dev() for recently added devices too (need_restore
* is negative then).
*/
if (need_restore)
genpd_restore_dev(genpd, dev);

Expand Down Expand Up @@ -603,6 +618,7 @@ static void genpd_power_off_work_fn(struct work_struct *work)
static int pm_genpd_runtime_suspend(struct device *dev)
{
struct generic_pm_domain *genpd;
struct generic_pm_domain_data *gpd_data;
bool (*stop_ok)(struct device *__dev);
int ret;

Expand All @@ -628,6 +644,16 @@ static int pm_genpd_runtime_suspend(struct device *dev)
return 0;

mutex_lock(&genpd->lock);

/*
* If we have an unknown state of the need_restore flag, it means none
* of the runtime PM callbacks has been invoked yet. Let's update the
* flag to reflect that the current state is active.
*/
gpd_data = to_gpd_data(dev->power.subsys_data->domain_data);
if (gpd_data->need_restore < 0)
gpd_data->need_restore = 0;

genpd->in_progress++;
pm_genpd_poweroff(genpd);
genpd->in_progress--;
Expand Down Expand Up @@ -1442,7 +1468,7 @@ int __pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev,
mutex_lock(&gpd_data->lock);
gpd_data->base.dev = dev;
list_add_tail(&gpd_data->base.list_node, &genpd->dev_list);
gpd_data->need_restore = genpd->status == GPD_STATE_POWER_OFF;
gpd_data->need_restore = -1;
gpd_data->td.constraint_changed = true;
gpd_data->td.effective_constraint_ns = -1;
mutex_unlock(&gpd_data->lock);
Expand Down Expand Up @@ -1546,7 +1572,7 @@ void pm_genpd_dev_need_restore(struct device *dev, bool val)

psd = dev_to_psd(dev);
if (psd && psd->domain_data)
to_gpd_data(psd->domain_data)->need_restore = val;
to_gpd_data(psd->domain_data)->need_restore = val ? 1 : 0;

spin_unlock_irqrestore(&dev->power.lock, flags);
}
Expand Down
2 changes: 1 addition & 1 deletion include/linux/pm_domain.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -106,7 +106,7 @@ struct generic_pm_domain_data {
struct notifier_block nb;
struct mutex lock;
unsigned int refcount;
bool need_restore;
int need_restore;
};

#ifdef CONFIG_PM_GENERIC_DOMAINS
Expand Down

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