Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759272Ab3E1XUP (ORCPT ); Tue, 28 May 2013 19:20:15 -0400 Received: from hydra.sisk.pl ([212.160.235.94]:53662 "EHLO hydra.sisk.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758468Ab3E1XUN (ORCPT ); Tue, 28 May 2013 19:20:13 -0400 From: "Rafael J. Wysocki" To: Linux PM list Cc: ACPI Devel Maling List , LKML , Greg Kroah-Hartman , Alan Stern , Bjorn Helgaas , Linux PCI , Kevin Hilman , Mika Westerberg Subject: [PATCH RFC] PM / Runtime: Rework the "runtime idle" helper routine Date: Wed, 29 May 2013 01:29:06 +0200 Message-ID: <1463685.qFyr66vqF2@vostro.rjw.lan> User-Agent: KMail/4.9.5 (Linux/3.10.0-rc3+; KDE/4.9.5; x86_64; ; ) MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="utf-8" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 12058 Lines: 336 From: Rafael J. Wysocki 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 --- 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) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/