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Date: Sun, 2 Jun 2013 21:44:29 +0200
From: Ulf Hansson <ulf.hansson@...aro.org>
To: "Rafael J. Wysocki" <rjw@...k.pl>
Cc: Linux PM list <linux-pm@...r.kernel.org>,
ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
LKML <linux-kernel@...r.kernel.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Alan Stern <stern@...land.harvard.edu>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Linux PCI <linux-pci@...r.kernel.org>,
Kevin Hilman <khilman@...aro.org>,
Mika Westerberg <mika.westerberg@...ux.intel.com>
Subject: Re: [PATCH RFC] PM / Runtime: Rework the "runtime idle" helper routine
On 29 May 2013 01:29, Rafael J. Wysocki <rjw@...k.pl> wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
>
> The "runtime idle" helper routine, rpm_idle(), currently ignores
> return values from .runtime_idle() callbacks executed by it.
>
> However, it turns out that many subsystems use the generic idle
> callback routine pm_generic_runtime_idle() which checks the return
> value of the driver's callback and executes pm_runtime_suspend() for
> the device unless that value is different from 0. If that logic is
> moved to rpm_idle() instead, pm_generic_runtime_idle() can be dropped
> and its users will not need any .runtime_idle() callbacks any more.
>
> Moreover, the PCI subsystem's .runtime_idle() routine,
> pci_pm_runtime_idle(), works in analogy with the generic one and if
> rpm_idle() calls rpm_suspend() after 0 has been returned by the
> .runtime_idle() callback executed by it, that routine will not be
> necessary any more and may be dropped.
>
> To reduce overall code duplication make the changes described above.
>
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> ---
This looks good to me!
Reviewed-by: Ulf Hansson <ulf.hansson@...aro.org>
>
> The patch doesn't break compilation for me, but it hasn't been tested
> otherwise. It applies on top of the linux-pm.git tree's linux-next branch.
>
> Thanks,
> Rafael
>
> ---
> Documentation/power/runtime_pm.txt | 5 -----
> arch/arm/mach-omap2/omap_device.c | 7 +------
> drivers/acpi/device_pm.c | 1 -
> drivers/amba/bus.c | 2 +-
> drivers/base/platform.c | 1 -
> drivers/base/power/domain.c | 1 -
> drivers/base/power/generic_ops.c | 23 -----------------------
> drivers/base/power/runtime.c | 12 +++++-------
> drivers/i2c/i2c-core.c | 2 +-
> drivers/mmc/core/sdio_bus.c | 2 +-
> drivers/pci/pci-driver.c | 27 ---------------------------
> drivers/spi/spi.c | 2 +-
> drivers/usb/core/port.c | 1 -
> include/linux/pm_runtime.h | 2 --
> 14 files changed, 10 insertions(+), 78 deletions(-)
>
> Index: linux-pm/drivers/base/power/runtime.c
> ===================================================================
> --- linux-pm.orig/drivers/base/power/runtime.c
> +++ linux-pm/drivers/base/power/runtime.c
> @@ -293,11 +293,8 @@ static int rpm_idle(struct device *dev,
> /* Pending requests need to be canceled. */
> dev->power.request = RPM_REQ_NONE;
>
> - if (dev->power.no_callbacks) {
> - /* Assume ->runtime_idle() callback would have suspended. */
> - retval = rpm_suspend(dev, rpmflags);
> + if (dev->power.no_callbacks)
> goto out;
> - }
>
> /* Carry out an asynchronous or a synchronous idle notification. */
> if (rpmflags & RPM_ASYNC) {
> @@ -306,7 +303,8 @@ static int rpm_idle(struct device *dev,
> dev->power.request_pending = true;
> queue_work(pm_wq, &dev->power.work);
> }
> - goto out;
> + trace_rpm_return_int(dev, _THIS_IP_, 0);
> + return 0;
> }
>
> dev->power.idle_notification = true;
> @@ -326,14 +324,14 @@ static int rpm_idle(struct device *dev,
> callback = dev->driver->pm->runtime_idle;
>
> if (callback)
> - __rpm_callback(callback, dev);
> + retval = __rpm_callback(callback, dev);
>
> dev->power.idle_notification = false;
> wake_up_all(&dev->power.wait_queue);
>
> out:
> trace_rpm_return_int(dev, _THIS_IP_, retval);
> - return retval;
> + return retval ? retval : rpm_suspend(dev, rpmflags);
> }
>
> /**
> Index: linux-pm/drivers/base/power/generic_ops.c
> ===================================================================
> --- linux-pm.orig/drivers/base/power/generic_ops.c
> +++ linux-pm/drivers/base/power/generic_ops.c
> @@ -12,29 +12,6 @@
>
> #ifdef CONFIG_PM_RUNTIME
> /**
> - * pm_generic_runtime_idle - Generic runtime idle callback for subsystems.
> - * @dev: Device to handle.
> - *
> - * If PM operations are defined for the @dev's driver and they include
> - * ->runtime_idle(), execute it and return its error code, if nonzero.
> - * Otherwise, execute pm_runtime_suspend() for the device and return 0.
> - */
> -int pm_generic_runtime_idle(struct device *dev)
> -{
> - const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
> -
> - if (pm && pm->runtime_idle) {
> - int ret = pm->runtime_idle(dev);
> - if (ret)
> - return ret;
> - }
> -
> - pm_runtime_suspend(dev);
> - return 0;
> -}
> -EXPORT_SYMBOL_GPL(pm_generic_runtime_idle);
> -
> -/**
> * pm_generic_runtime_suspend - Generic runtime suspend callback for subsystems.
> * @dev: Device to suspend.
> *
> Index: linux-pm/include/linux/pm_runtime.h
> ===================================================================
> --- linux-pm.orig/include/linux/pm_runtime.h
> +++ linux-pm/include/linux/pm_runtime.h
> @@ -37,7 +37,6 @@ extern void pm_runtime_enable(struct dev
> extern void __pm_runtime_disable(struct device *dev, bool check_resume);
> extern void pm_runtime_allow(struct device *dev);
> extern void pm_runtime_forbid(struct device *dev);
> -extern int pm_generic_runtime_idle(struct device *dev);
> extern int pm_generic_runtime_suspend(struct device *dev);
> extern int pm_generic_runtime_resume(struct device *dev);
> extern void pm_runtime_no_callbacks(struct device *dev);
> @@ -143,7 +142,6 @@ static inline bool pm_runtime_active(str
> static inline bool pm_runtime_status_suspended(struct device *dev) { return false; }
> static inline bool pm_runtime_enabled(struct device *dev) { return false; }
>
> -static inline int pm_generic_runtime_idle(struct device *dev) { return 0; }
> static inline int pm_generic_runtime_suspend(struct device *dev) { return 0; }
> static inline int pm_generic_runtime_resume(struct device *dev) { return 0; }
> static inline void pm_runtime_no_callbacks(struct device *dev) {}
> Index: linux-pm/arch/arm/mach-omap2/omap_device.c
> ===================================================================
> --- linux-pm.orig/arch/arm/mach-omap2/omap_device.c
> +++ linux-pm/arch/arm/mach-omap2/omap_device.c
> @@ -591,11 +591,6 @@ static int _od_runtime_suspend(struct de
> return ret;
> }
>
> -static int _od_runtime_idle(struct device *dev)
> -{
> - return pm_generic_runtime_idle(dev);
> -}
> -
> static int _od_runtime_resume(struct device *dev)
> {
> struct platform_device *pdev = to_platform_device(dev);
> @@ -653,7 +648,7 @@ static int _od_resume_noirq(struct devic
> struct dev_pm_domain omap_device_pm_domain = {
> .ops = {
> SET_RUNTIME_PM_OPS(_od_runtime_suspend, _od_runtime_resume,
> - _od_runtime_idle)
> + NULL)
> USE_PLATFORM_PM_SLEEP_OPS
> .suspend_noirq = _od_suspend_noirq,
> .resume_noirq = _od_resume_noirq,
> Index: linux-pm/drivers/acpi/device_pm.c
> ===================================================================
> --- linux-pm.orig/drivers/acpi/device_pm.c
> +++ linux-pm/drivers/acpi/device_pm.c
> @@ -886,7 +886,6 @@ static struct dev_pm_domain acpi_general
> #ifdef CONFIG_PM_RUNTIME
> .runtime_suspend = acpi_subsys_runtime_suspend,
> .runtime_resume = acpi_subsys_runtime_resume,
> - .runtime_idle = pm_generic_runtime_idle,
> #endif
> #ifdef CONFIG_PM_SLEEP
> .prepare = acpi_subsys_prepare,
> Index: linux-pm/drivers/amba/bus.c
> ===================================================================
> --- linux-pm.orig/drivers/amba/bus.c
> +++ linux-pm/drivers/amba/bus.c
> @@ -284,7 +284,7 @@ static const struct dev_pm_ops amba_pm =
> SET_RUNTIME_PM_OPS(
> amba_pm_runtime_suspend,
> amba_pm_runtime_resume,
> - pm_generic_runtime_idle
> + NULL
> )
> };
>
> Index: linux-pm/drivers/base/power/domain.c
> ===================================================================
> --- linux-pm.orig/drivers/base/power/domain.c
> +++ linux-pm/drivers/base/power/domain.c
> @@ -2143,7 +2143,6 @@ void pm_genpd_init(struct generic_pm_dom
> genpd->max_off_time_changed = true;
> genpd->domain.ops.runtime_suspend = pm_genpd_runtime_suspend;
> genpd->domain.ops.runtime_resume = pm_genpd_runtime_resume;
> - genpd->domain.ops.runtime_idle = pm_generic_runtime_idle;
> genpd->domain.ops.prepare = pm_genpd_prepare;
> genpd->domain.ops.suspend = pm_genpd_suspend;
> genpd->domain.ops.suspend_late = pm_genpd_suspend_late;
> Index: linux-pm/drivers/base/platform.c
> ===================================================================
> --- linux-pm.orig/drivers/base/platform.c
> +++ linux-pm/drivers/base/platform.c
> @@ -888,7 +888,6 @@ int platform_pm_restore(struct device *d
> static const struct dev_pm_ops platform_dev_pm_ops = {
> .runtime_suspend = pm_generic_runtime_suspend,
> .runtime_resume = pm_generic_runtime_resume,
> - .runtime_idle = pm_generic_runtime_idle,
> USE_PLATFORM_PM_SLEEP_OPS
> };
>
> Index: linux-pm/drivers/i2c/i2c-core.c
> ===================================================================
> --- linux-pm.orig/drivers/i2c/i2c-core.c
> +++ linux-pm/drivers/i2c/i2c-core.c
> @@ -435,7 +435,7 @@ static const struct dev_pm_ops i2c_devic
> SET_RUNTIME_PM_OPS(
> pm_generic_runtime_suspend,
> pm_generic_runtime_resume,
> - pm_generic_runtime_idle
> + NULL
> )
> };
>
> Index: linux-pm/drivers/mmc/core/sdio_bus.c
> ===================================================================
> --- linux-pm.orig/drivers/mmc/core/sdio_bus.c
> +++ linux-pm/drivers/mmc/core/sdio_bus.c
> @@ -211,7 +211,7 @@ static const struct dev_pm_ops sdio_bus_
> SET_RUNTIME_PM_OPS(
> pm_generic_runtime_suspend,
> pm_generic_runtime_resume,
> - pm_generic_runtime_idle
> + NULL
> )
> };
>
> Index: linux-pm/drivers/spi/spi.c
> ===================================================================
> --- linux-pm.orig/drivers/spi/spi.c
> +++ linux-pm/drivers/spi/spi.c
> @@ -223,7 +223,7 @@ static const struct dev_pm_ops spi_pm =
> SET_RUNTIME_PM_OPS(
> pm_generic_runtime_suspend,
> pm_generic_runtime_resume,
> - pm_generic_runtime_idle
> + NULL
> )
> };
>
> Index: linux-pm/drivers/usb/core/port.c
> ===================================================================
> --- linux-pm.orig/drivers/usb/core/port.c
> +++ linux-pm/drivers/usb/core/port.c
> @@ -141,7 +141,6 @@ static const struct dev_pm_ops usb_port_
> #ifdef CONFIG_PM_RUNTIME
> .runtime_suspend = usb_port_runtime_suspend,
> .runtime_resume = usb_port_runtime_resume,
> - .runtime_idle = pm_generic_runtime_idle,
> #endif
> };
>
> Index: linux-pm/Documentation/power/runtime_pm.txt
> ===================================================================
> --- linux-pm.orig/Documentation/power/runtime_pm.txt
> +++ linux-pm/Documentation/power/runtime_pm.txt
> @@ -660,11 +660,6 @@ Subsystems may wish to conserve code spa
> management callbacks provided by the PM core, defined in
> driver/base/power/generic_ops.c:
>
> - int pm_generic_runtime_idle(struct device *dev);
> - - invoke the ->runtime_idle() callback provided by the driver of this
> - device, if defined, and call pm_runtime_suspend() for this device if the
> - return value is 0 or the callback is not defined
> -
> int pm_generic_runtime_suspend(struct device *dev);
> - invoke the ->runtime_suspend() callback provided by the driver of this
> device and return its result, or return -EINVAL if not defined
> Index: linux-pm/drivers/pci/pci-driver.c
> ===================================================================
> --- linux-pm.orig/drivers/pci/pci-driver.c
> +++ linux-pm/drivers/pci/pci-driver.c
> @@ -1046,32 +1046,6 @@ static int pci_pm_runtime_resume(struct
> return rc;
> }
>
> -static int pci_pm_runtime_idle(struct device *dev)
> -{
> - struct pci_dev *pci_dev = to_pci_dev(dev);
> - const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
> -
> - /*
> - * If pci_dev->driver is not set (unbound), the device should
> - * always remain in D0 regardless of the runtime PM status
> - */
> - if (!pci_dev->driver)
> - goto out;
> -
> - if (!pm)
> - return -ENOSYS;
> -
> - if (pm->runtime_idle) {
> - int ret = pm->runtime_idle(dev);
> - if (ret)
> - return ret;
> - }
> -
> -out:
> - pm_runtime_suspend(dev);
> - return 0;
> -}
> -
> #else /* !CONFIG_PM_RUNTIME */
>
> #define pci_pm_runtime_suspend NULL
> @@ -1099,7 +1073,6 @@ const struct dev_pm_ops pci_dev_pm_ops =
> .restore_noirq = pci_pm_restore_noirq,
> .runtime_suspend = pci_pm_runtime_suspend,
> .runtime_resume = pci_pm_runtime_resume,
> - .runtime_idle = pci_pm_runtime_idle,
> };
>
> #define PCI_PM_OPS_PTR (&pci_dev_pm_ops)
>
> --
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