[PATCH v9 2/4] PM / Domains: add setter for dev.pm_domain

From: Tomeu Vizoso
Date: Mon Oct 05 2015 - 10:50:57 EST

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Adds a function that sets the pointer to dev_pm_domain in struct device
and that warns if the device has already finished probing. The reason
why we want to enforce that is because in the general case that can
cause problems and also that we can simplify code quite a bit if we can
always assume that.

This patch also changes all current code that directly sets the
dev.pm_domain pointer.

Signed-off-by: Tomeu Vizoso <tomeu.vizoso@xxxxxxxxxxxxx>
---

Changes in v9:
- Add docs noting the need for the device lock to be held before calling
dev_pm_domain_set()

Changes in v8:
- Add dev_pm_domain_set() and update code to use it

arch/arm/mach-omap2/omap_device.c | 7 ++++---
drivers/acpi/acpi_lpss.c | 5 +++--
drivers/acpi/device_pm.c | 5 +++--
drivers/base/power/clock_ops.c | 5 +++--
drivers/base/power/common.c | 21 +++++++++++++++++++++
drivers/base/power/domain.c | 4 ++--
drivers/gpu/vga/vga_switcheroo.c | 10 +++++-----
drivers/misc/mei/pci-me.c | 5 +++--
drivers/misc/mei/pci-txe.c | 5 +++--
include/linux/pm_domain.h | 3 +++
10 files changed, 50 insertions(+), 20 deletions(-)

diff --git a/arch/arm/mach-omap2/omap_device.c b/arch/arm/mach-omap2/omap_device.c
index 4cb8fd9f741f..204101d11632 100644
--- a/arch/arm/mach-omap2/omap_device.c
+++ b/arch/arm/mach-omap2/omap_device.c
@@ -32,6 +32,7 @@
#include <linux/io.h>
#include <linux/clk.h>
#include <linux/clkdev.h>
+#include <linux/pm_domain.h>
#include <linux/pm_runtime.h>
#include <linux/of.h>
#include <linux/notifier.h>
@@ -168,7 +169,7 @@ static int omap_device_build_from_dt(struct platform_device *pdev)
r->name = dev_name(&pdev->dev);
}

- pdev->dev.pm_domain = &omap_device_pm_domain;
+ dev_pm_domain_set(&pdev->dev, &omap_device_pm_domain);

if (device_active) {
omap_device_enable(pdev);
@@ -180,7 +181,7 @@ odbfd_exit1:
odbfd_exit:
/* if data/we are at fault.. load up a fail handler */
if (ret)
- pdev->dev.pm_domain = &omap_device_fail_pm_domain;
+ dev_pm_domain_set(&pdev->dev, &omap_device_fail_pm_domain);

return ret;
}
@@ -701,7 +702,7 @@ int omap_device_register(struct platform_device *pdev)
{
pr_debug("omap_device: %s: registering\n", pdev->name);

- pdev->dev.pm_domain = &omap_device_pm_domain;
+ dev_pm_domain_set(&pdev->dev, &omap_device_pm_domain);
return platform_device_add(pdev);
}

diff --git a/drivers/acpi/acpi_lpss.c b/drivers/acpi/acpi_lpss.c
index f51bd0d0bc17..cc6e1abc69b3 100644
--- a/drivers/acpi/acpi_lpss.c
+++ b/drivers/acpi/acpi_lpss.c
@@ -17,6 +17,7 @@
#include <linux/io.h>
#include <linux/platform_device.h>
#include <linux/platform_data/clk-lpss.h>
+#include <linux/pm_domain.h>
#include <linux/pm_runtime.h>
#include <linux/delay.h>

@@ -706,7 +707,7 @@ static int acpi_lpss_platform_notify(struct notifier_block *nb,

switch (action) {
case BUS_NOTIFY_ADD_DEVICE:
- pdev->dev.pm_domain = &acpi_lpss_pm_domain;
+ dev_pm_domain_set(&pdev->dev, &acpi_lpss_pm_domain);
if (pdata->dev_desc->flags & LPSS_LTR)
return sysfs_create_group(&pdev->dev.kobj,
&lpss_attr_group);
@@ -714,7 +715,7 @@ static int acpi_lpss_platform_notify(struct notifier_block *nb,
case BUS_NOTIFY_DEL_DEVICE:
if (pdata->dev_desc->flags & LPSS_LTR)
sysfs_remove_group(&pdev->dev.kobj, &lpss_attr_group);
- pdev->dev.pm_domain = NULL;
+ dev_pm_domain_set(&pdev->dev, NULL);
break;
default:
break;
diff --git a/drivers/acpi/device_pm.c b/drivers/acpi/device_pm.c
index 4806b7f856c4..8c5955bf9bbf 100644
--- a/drivers/acpi/device_pm.c
+++ b/drivers/acpi/device_pm.c
@@ -22,6 +22,7 @@
#include <linux/export.h>
#include <linux/mutex.h>
#include <linux/pm_qos.h>
+#include <linux/pm_domain.h>
#include <linux/pm_runtime.h>

#include "internal.h"
@@ -1076,7 +1077,7 @@ static void acpi_dev_pm_detach(struct device *dev, bool power_off)
struct acpi_device *adev = ACPI_COMPANION(dev);

if (adev && dev->pm_domain == &acpi_general_pm_domain) {
- dev->pm_domain = NULL;
+ dev_pm_domain_set(dev, NULL);
acpi_remove_pm_notifier(adev);
if (power_off) {
/*
@@ -1128,7 +1129,7 @@ int acpi_dev_pm_attach(struct device *dev, bool power_on)
return -EBUSY;

acpi_add_pm_notifier(adev, dev, acpi_pm_notify_work_func);
- dev->pm_domain = &acpi_general_pm_domain;
+ dev_pm_domain_set(dev, &acpi_general_pm_domain);
if (power_on) {
acpi_dev_pm_full_power(adev);
acpi_device_wakeup(adev, ACPI_STATE_S0, false);
diff --git a/drivers/base/power/clock_ops.c b/drivers/base/power/clock_ops.c
index 652b5a367c1f..e80fda6c03a9 100644
--- a/drivers/base/power/clock_ops.c
+++ b/drivers/base/power/clock_ops.c
@@ -15,6 +15,7 @@
#include <linux/clkdev.h>
#include <linux/slab.h>
#include <linux/err.h>
+#include <linux/pm_domain.h>
#include <linux/pm_runtime.h>

#ifdef CONFIG_PM
@@ -346,7 +347,7 @@ static int pm_clk_notify(struct notifier_block *nb,
if (error)
break;

- dev->pm_domain = clknb->pm_domain;
+ dev_pm_domain_set(dev, clknb->pm_domain);
if (clknb->con_ids[0]) {
for (con_id = clknb->con_ids; *con_id; con_id++)
pm_clk_add(dev, *con_id);
@@ -359,7 +360,7 @@ static int pm_clk_notify(struct notifier_block *nb,
if (dev->pm_domain != clknb->pm_domain)
break;

- dev->pm_domain = NULL;
+ dev_pm_domain_set(dev, NULL);
pm_clk_destroy(dev);
break;
}
diff --git a/drivers/base/power/common.c b/drivers/base/power/common.c
index f32b802b98f4..a70f8a5cdfd7 100644
--- a/drivers/base/power/common.c
+++ b/drivers/base/power/common.c
@@ -128,3 +128,24 @@ void dev_pm_domain_detach(struct device *dev, bool power_off)
dev->pm_domain->detach(dev, power_off);
}
EXPORT_SYMBOL_GPL(dev_pm_domain_detach);
+
+/**
+ * dev_pm_domain_set - Set PM domain of a device.
+ * @dev: Device whose PM domain is to be set.
+ * @pd: PM domain to be set, or NULL.
+ *
+ * Sets the PM domain the device belongs to. The PM domain of a device needs
+ * to be set before its probe finishes (it's bound to a driver).
+ *
+ * This function must be called with the device lock held.
+ */
+void dev_pm_domain_set(struct device *dev, struct dev_pm_domain *pd)
+{
+ if (dev->pm_domain == pd)
+ return;
+
+ WARN(device_is_bound(dev),
+ "PM domains can only be changed for unbound devices\n");
+ dev->pm_domain = pd;
+}
+EXPORT_SYMBOL_GPL(dev_pm_domain_set);
diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 16550c63d611..b75d02aa8d93 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -1240,7 +1240,7 @@ static struct generic_pm_domain_data *genpd_alloc_dev_data(struct device *dev,
}

dev->power.subsys_data->domain_data = &gpd_data->base;
- dev->pm_domain = &genpd->domain;
+ dev_pm_domain_set(dev, &genpd->domain);

spin_unlock_irq(&dev->power.lock);

@@ -1259,7 +1259,7 @@ static void genpd_free_dev_data(struct device *dev,
{
spin_lock_irq(&dev->power.lock);

- dev->pm_domain = NULL;
+ dev_pm_domain_set(dev, NULL);
dev->power.subsys_data->domain_data = NULL;

spin_unlock_irq(&dev->power.lock);
diff --git a/drivers/gpu/vga/vga_switcheroo.c b/drivers/gpu/vga/vga_switcheroo.c
index 21060668fd25..2c3208ea6de4 100644
--- a/drivers/gpu/vga/vga_switcheroo.c
+++ b/drivers/gpu/vga/vga_switcheroo.c
@@ -665,17 +665,17 @@ int vga_switcheroo_init_domain_pm_ops(struct device *dev,
domain->ops.runtime_suspend = vga_switcheroo_runtime_suspend;
domain->ops.runtime_resume = vga_switcheroo_runtime_resume;

- dev->pm_domain = domain;
+ dev_pm_domain_set(dev, domain);
return 0;
}
- dev->pm_domain = NULL;
+ dev_pm_domain_set(dev, NULL);
return -EINVAL;
}
EXPORT_SYMBOL(vga_switcheroo_init_domain_pm_ops);

void vga_switcheroo_fini_domain_pm_ops(struct device *dev)
{
- dev->pm_domain = NULL;
+ dev_pm_domain_set(dev, NULL);
}
EXPORT_SYMBOL(vga_switcheroo_fini_domain_pm_ops);

@@ -719,10 +719,10 @@ vga_switcheroo_init_domain_pm_optimus_hdmi_audio(struct device *dev,
domain->ops.runtime_resume =
vga_switcheroo_runtime_resume_hdmi_audio;

- dev->pm_domain = domain;
+ dev_pm_domain_set(dev, domain);
return 0;
}
- dev->pm_domain = NULL;
+ dev_pm_domain_set(dev, NULL);
return -EINVAL;
}
EXPORT_SYMBOL(vga_switcheroo_init_domain_pm_optimus_hdmi_audio);
diff --git a/drivers/misc/mei/pci-me.c b/drivers/misc/mei/pci-me.c
index 27678d8154e0..75fc9c688df8 100644
--- a/drivers/misc/mei/pci-me.c
+++ b/drivers/misc/mei/pci-me.c
@@ -31,6 +31,7 @@
#include <linux/jiffies.h>
#include <linux/interrupt.h>

+#include <linux/pm_domain.h>
#include <linux/pm_runtime.h>

#include <linux/mei.h>
@@ -436,7 +437,7 @@ static inline void mei_me_set_pm_domain(struct mei_device *dev)
dev->pg_domain.ops.runtime_resume = mei_me_pm_runtime_resume;
dev->pg_domain.ops.runtime_idle = mei_me_pm_runtime_idle;

- pdev->dev.pm_domain = &dev->pg_domain;
+ dev_pm_domain_set(&pdev->dev, &dev->pg_domain);
}
}

@@ -448,7 +449,7 @@ static inline void mei_me_set_pm_domain(struct mei_device *dev)
static inline void mei_me_unset_pm_domain(struct mei_device *dev)
{
/* stop using pm callbacks if any */
- dev->dev->pm_domain = NULL;
+ dev_pm_domain_set(dev->dev, NULL);
}

static const struct dev_pm_ops mei_me_pm_ops = {
diff --git a/drivers/misc/mei/pci-txe.c b/drivers/misc/mei/pci-txe.c
index 0882c0201907..71f8a7475717 100644
--- a/drivers/misc/mei/pci-txe.c
+++ b/drivers/misc/mei/pci-txe.c
@@ -27,6 +27,7 @@
#include <linux/jiffies.h>
#include <linux/interrupt.h>
#include <linux/workqueue.h>
+#include <linux/pm_domain.h>
#include <linux/pm_runtime.h>

#include <linux/mei.h>
@@ -388,7 +389,7 @@ static inline void mei_txe_set_pm_domain(struct mei_device *dev)
dev->pg_domain.ops.runtime_resume = mei_txe_pm_runtime_resume;
dev->pg_domain.ops.runtime_idle = mei_txe_pm_runtime_idle;

- pdev->dev.pm_domain = &dev->pg_domain;
+ dev_pm_domain_set(&pdev->dev, &dev->pg_domain);
}
}

@@ -400,7 +401,7 @@ static inline void mei_txe_set_pm_domain(struct mei_device *dev)
static inline void mei_txe_unset_pm_domain(struct mei_device *dev)
{
/* stop using pm callbacks if any */
- dev->dev->pm_domain = NULL;
+ dev_pm_domain_set(dev->dev, NULL);
}

static const struct dev_pm_ops mei_txe_pm_ops = {
diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h
index b1cf7e797892..4ae4b14fb7b4 100644
--- a/include/linux/pm_domain.h
+++ b/include/linux/pm_domain.h
@@ -306,12 +306,15 @@ static inline int of_genpd_add_provider_onecell(struct device_node *np,
#ifdef CONFIG_PM
extern int dev_pm_domain_attach(struct device *dev, bool power_on);
extern void dev_pm_domain_detach(struct device *dev, bool power_off);
+extern void dev_pm_domain_set(struct device *dev, struct dev_pm_domain *pd);
#else
static inline int dev_pm_domain_attach(struct device *dev, bool power_on)
{
return -ENODEV;
}
static inline void dev_pm_domain_detach(struct device *dev, bool power_off) {}
+static inline void dev_pm_domain_set(struct device *dev,
+ struct dev_pm_domain *pd) {}
#endif

#endif /* _LINUX_PM_DOMAIN_H */
--
2.4.3

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