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Message-ID: <CAAObsKA9QJ9-H3=KvNLusy1GSmtsd_U9fhSqXXhzhp-GDhm84g@mail.gmail.com>
Date: Mon, 26 Oct 2015 10:11:56 +0100
From: Tomeu Vizoso <tomeu.vizoso@...labora.com>
To: "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc: "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
Alan Stern <stern@...land.harvard.edu>,
martyn.welch@...labora.co.uk, Ulf Hansson <ulf.hansson@...aro.org>,
David Airlie <airlied@...ux.ie>,
Tomas Winkler <tomas.winkler@...el.com>,
linux-acpi@...r.kernel.org,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
Russell King <linux@....linux.org.uk>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Kevin Hilman <khilman@...nel.org>,
Tony Lindgren <tony@...mide.com>, Len Brown <lenb@...nel.org>,
"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
Pavel Machek <pavel@....cz>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v10 2/4] PM / Domains: add setter for dev.pm_domain
On 25 October 2015 at 16:18, Rafael J. Wysocki <rjw@...ysocki.net> wrote:
> On Wednesday, October 21, 2015 05:34:12 PM Tomeu Vizoso wrote:
>> 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@...labora.com>
>> Reviewed-by: Ulf Hansson <ulf.hansson@...aro.org>
>> ---
>>
>> 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.
>
> So obviously every caller of this function that doesn't lock the device has to
> be called with the device locked already.
>
> Have you verified that this is the case?
Haven't checked that all the possible codepaths have the device lock,
but as they were modifying dev->pm_domain already, I assumed they
should.
Regards,
Tomeu
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