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Merge branches 'pm-sleep' and 'pm-domains'

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* pm-sleep:
  PM / watchdog: iTCO: stop watchdog during system suspend
  PM / sleep: add pm-trace support for suspending phase
  PM / sleep: add configurable delay for pm_test

* pm-domains:
  PM / domains: avoid potential oops in pm_genpd_remove_device()
  PM / domains: factor out code to get the generic PM domain from a struct device
  PM / domains: quieten down generic pm domains
  PM / Domains: Sync runtime PM status with genpd after probe
  driver core / PM: Add PM domain callbacks for device setup/cleanup
  MAINTAINERS: add entry for Generic PM domains (genpd)
This commit is contained in:
Rafael J. Wysocki 2015-04-13 00:37:13 +02:00
commit 0fe0952b21
14 changed files with 189 additions and 46 deletions
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7
Documentation/kernel-parameters.txt
View File

@ -3462,6 +3462,13 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
improve throughput, but will also increase the
amount of memory reserved for use by the client.
suspend.pm_test_delay=
[SUSPEND]
Sets the number of seconds to remain in a suspend test
mode before resuming the system (see
/sys/power/pm_test). Only available when CONFIG_PM_DEBUG
is set. Default value is 5.
swapaccount=[0|1]
[KNL] Enable accounting of swap in memory resource
controller if no parameter or 1 is given or disable

10
Documentation/power/basic-pm-debugging.txt
View File

@ -75,12 +75,14 @@ you should do the following:
# echo platform > /sys/power/disk
# echo disk > /sys/power/state
Then, the kernel will try to freeze processes, suspend devices, wait 5 seconds,
resume devices and thaw processes. If "platform" is written to
Then, the kernel will try to freeze processes, suspend devices, wait a few
seconds (5 by default, but configurable by the suspend.pm_test_delay module
parameter), resume devices and thaw processes. If "platform" is written to
/sys/power/pm_test , then after suspending devices the kernel will additionally
invoke the global control methods (eg. ACPI global control methods) used to
prepare the platform firmware for hibernation. Next, it will wait 5 seconds and
invoke the platform (eg. ACPI) global methods used to cancel hibernation etc.
prepare the platform firmware for hibernation. Next, it will wait a
configurable number of seconds and invoke the platform (eg. ACPI) global
methods used to cancel hibernation etc.
Writing "none" to /sys/power/pm_test causes the kernel to switch to the normal
hibernation/suspend operations. Also, when open for reading, /sys/power/pm_test

9
MAINTAINERS
View File

@ -4312,6 +4312,15 @@ S: Supported
F: drivers/phy/
F: include/linux/phy/
GENERIC PM DOMAINS
M: "Rafael J. Wysocki" <rjw@rjwysocki.net>
M: Kevin Hilman <khilman@kernel.org>
M: Ulf Hansson <ulf.hansson@linaro.org>
L: linux-pm@vger.kernel.org
S: Supported
F: drivers/base/power/domain*.c
F: include/linux/pm_domain.h
GENERIC UIO DRIVER FOR PCI DEVICES
M: "Michael S. Tsirkin" <mst@redhat.com>
L: kvm@vger.kernel.org

10
arch/x86/include/asm/resume-trace.h → arch/x86/include/asm/pm-trace.h
View File

@ -1,5 +1,5 @@
#ifndef _ASM_X86_RESUME_TRACE_H
#define _ASM_X86_RESUME_TRACE_H
#ifndef _ASM_X86_PM_TRACE_H
#define _ASM_X86_PM_TRACE_H
#include <asm/asm.h>
@ -14,8 +14,10 @@ do { \
".previous" \
:"=r" (tracedata) \
: "i" (__LINE__), "i" (__FILE__)); \
generate_resume_trace(tracedata, user); \
generate_pm_trace(tracedata, user); \
} \
} while (0)
#endif /* _ASM_X86_RESUME_TRACE_H */
#define TRACE_SUSPEND(user) TRACE_RESUME(user)
#endif /* _ASM_X86_PM_TRACE_H */

14
drivers/base/dd.c
View File

@ -298,6 +298,12 @@ static int really_probe(struct device *dev, struct device_driver *drv)
goto probe_failed;
}
if (dev->pm_domain && dev->pm_domain->activate) {
ret = dev->pm_domain->activate(dev);
if (ret)
goto probe_failed;
}
if (dev->bus->probe) {
ret = dev->bus->probe(dev);
if (ret)
@ -308,6 +314,9 @@ static int really_probe(struct device *dev, struct device_driver *drv)
goto probe_failed;
}
if (dev->pm_domain && dev->pm_domain->sync)
dev->pm_domain->sync(dev);
driver_bound(dev);
ret = 1;
pr_debug("bus: '%s': %s: bound device %s to driver %s\n",
@ -319,6 +328,8 @@ probe_failed:
driver_sysfs_remove(dev);
dev->driver = NULL;
dev_set_drvdata(dev, NULL);
if (dev->pm_domain && dev->pm_domain->dismiss)
dev->pm_domain->dismiss(dev);
if (ret == -EPROBE_DEFER) {
/* Driver requested deferred probing */
@ -525,6 +536,9 @@ static void __device_release_driver(struct device *dev)
devres_release_all(dev);
dev->driver = NULL;
dev_set_drvdata(dev, NULL);
if (dev->pm_domain && dev->pm_domain->dismiss)
dev->pm_domain->dismiss(dev);
klist_remove(&dev->p->knode_driver);
if (dev->bus)
blocking_notifier_call_chain(&dev->bus->p->bus_notifier,

70
drivers/base/power/domain.c
View File

@ -68,7 +68,36 @@ static struct generic_pm_domain *pm_genpd_lookup_name(const char *domain_name)
return genpd;
}
struct generic_pm_domain *dev_to_genpd(struct device *dev)
/*
* Get the generic PM domain for a particular struct device.
* This validates the struct device pointer, the PM domain pointer,
* and checks that the PM domain pointer is a real generic PM domain.
* Any failure results in NULL being returned.
*/
struct generic_pm_domain *pm_genpd_lookup_dev(struct device *dev)
{
struct generic_pm_domain *genpd = NULL, *gpd;
if (IS_ERR_OR_NULL(dev) || IS_ERR_OR_NULL(dev->pm_domain))
return NULL;
mutex_lock(&gpd_list_lock);
list_for_each_entry(gpd, &gpd_list, gpd_list_node) {
if (&gpd->domain == dev->pm_domain) {
genpd = gpd;
break;
}
}
mutex_unlock(&gpd_list_lock);
return genpd;
}
/*
* This should only be used where we are certain that the pm_domain
* attached to the device is a genpd domain.
*/
static struct generic_pm_domain *dev_to_genpd(struct device *dev)
{
if (IS_ERR_OR_NULL(dev->pm_domain))
return ERR_PTR(-EINVAL);
@ -173,8 +202,8 @@ static int genpd_power_on(struct generic_pm_domain *genpd)
genpd->power_on_latency_ns = elapsed_ns;
genpd->max_off_time_changed = true;
genpd_recalc_cpu_exit_latency(genpd);
pr_warn("%s: Power-%s latency exceeded, new value %lld ns\n",
genpd->name, "on", elapsed_ns);
pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n",
genpd->name, "on", elapsed_ns);
return ret;
}
@ -199,8 +228,8 @@ static int genpd_power_off(struct generic_pm_domain *genpd)
genpd->power_off_latency_ns = elapsed_ns;
genpd->max_off_time_changed = true;
pr_warn("%s: Power-%s latency exceeded, new value %lld ns\n",
genpd->name, "off", elapsed_ns);
pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n",
genpd->name, "off", elapsed_ns);
return ret;
}
@ -1513,9 +1542,7 @@ int pm_genpd_remove_device(struct generic_pm_domain *genpd,
dev_dbg(dev, "%s()\n", __func__);
if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)
|| IS_ERR_OR_NULL(dev->pm_domain)
|| pd_to_genpd(dev->pm_domain) != genpd)
if (!genpd || genpd != pm_genpd_lookup_dev(dev))
return -EINVAL;
/* The above validation also means we have existing domain_data. */
@ -2093,21 +2120,10 @@ EXPORT_SYMBOL_GPL(of_genpd_get_from_provider);
*/
static void genpd_dev_pm_detach(struct device *dev, bool power_off)
{
struct generic_pm_domain *pd = NULL, *gpd;
struct generic_pm_domain *pd;
int ret = 0;
if (!dev->pm_domain)
return;
mutex_lock(&gpd_list_lock);
list_for_each_entry(gpd, &gpd_list, gpd_list_node) {
if (&gpd->domain == dev->pm_domain) {
pd = gpd;
break;
}
}
mutex_unlock(&gpd_list_lock);
pd = pm_genpd_lookup_dev(dev);
if (!pd)
return;
@ -2130,6 +2146,17 @@ static void genpd_dev_pm_detach(struct device *dev, bool power_off)
genpd_queue_power_off_work(pd);
}
static void genpd_dev_pm_sync(struct device *dev)
{
struct generic_pm_domain *pd;
pd = dev_to_genpd(dev);
if (IS_ERR(pd))
return;
genpd_queue_power_off_work(pd);
}
/**
* genpd_dev_pm_attach - Attach a device to its PM domain using DT.
* @dev: Device to attach.
@ -2196,6 +2223,7 @@ int genpd_dev_pm_attach(struct device *dev)
}
dev->pm_domain->detach = genpd_dev_pm_detach;
dev->pm_domain->sync = genpd_dev_pm_sync;
pm_genpd_poweron(pd);
return 0;

20
drivers/base/power/main.c
View File

@ -23,7 +23,7 @@
#include <linux/mutex.h>
#include <linux/pm.h>
#include <linux/pm_runtime.h>
#include <linux/resume-trace.h>
#include <linux/pm-trace.h>
#include <linux/interrupt.h>
#include <linux/sched.h>
#include <linux/async.h>
@ -1017,6 +1017,9 @@ static int __device_suspend_noirq(struct device *dev, pm_message_t state, bool a
char *info = NULL;
int error = 0;
TRACE_DEVICE(dev);
TRACE_SUSPEND(0);
if (async_error)
goto Complete;
@ -1057,6 +1060,7 @@ static int __device_suspend_noirq(struct device *dev, pm_message_t state, bool a
Complete:
complete_all(&dev->power.completion);
TRACE_SUSPEND(error);
return error;
}
@ -1078,7 +1082,7 @@ static int device_suspend_noirq(struct device *dev)
{
reinit_completion(&dev->power.completion);
if (pm_async_enabled && dev->power.async_suspend) {
if (is_async(dev)) {
get_device(dev);
async_schedule(async_suspend_noirq, dev);
return 0;
@ -1157,6 +1161,9 @@ static int __device_suspend_late(struct device *dev, pm_message_t state, bool as
char *info = NULL;
int error = 0;
TRACE_DEVICE(dev);
TRACE_SUSPEND(0);
__pm_runtime_disable(dev, false);
if (async_error)
@ -1198,6 +1205,7 @@ static int __device_suspend_late(struct device *dev, pm_message_t state, bool as
async_error = error;
Complete:
TRACE_SUSPEND(error);
complete_all(&dev->power.completion);
return error;
}
@ -1219,7 +1227,7 @@ static int device_suspend_late(struct device *dev)
{
reinit_completion(&dev->power.completion);
if (pm_async_enabled && dev->power.async_suspend) {
if (is_async(dev)) {
get_device(dev);
async_schedule(async_suspend_late, dev);
return 0;
@ -1338,6 +1346,9 @@ static int __device_suspend(struct device *dev, pm_message_t state, bool async)
int error = 0;
DECLARE_DPM_WATCHDOG_ON_STACK(wd);
TRACE_DEVICE(dev);
TRACE_SUSPEND(0);
dpm_wait_for_children(dev, async);
if (async_error)
@ -1444,6 +1455,7 @@ static int __device_suspend(struct device *dev, pm_message_t state, bool async)
if (error)
async_error = error;
TRACE_SUSPEND(error);
return error;
}
@ -1465,7 +1477,7 @@ static int device_suspend(struct device *dev)
{
reinit_completion(&dev->power.completion);
if (pm_async_enabled && dev->power.async_suspend) {
if (is_async(dev)) {
get_device(dev);
async_schedule(async_suspend, dev);
return 0;

6
drivers/base/power/trace.c
View File

@ -7,7 +7,7 @@
* devices may be working.
*/
#include <linux/resume-trace.h>
#include <linux/pm-trace.h>
#include <linux/export.h>
#include <linux/rtc.h>
@ -154,7 +154,7 @@ EXPORT_SYMBOL(set_trace_device);
* it's not any guarantee, but it's a high _likelihood_ that
* the match is valid).
*/
void generate_resume_trace(const void *tracedata, unsigned int user)
void generate_pm_trace(const void *tracedata, unsigned int user)
{
unsigned short lineno = *(unsigned short *)tracedata;
const char *file = *(const char **)(tracedata + 2);
@ -164,7 +164,7 @@ void generate_resume_trace(const void *tracedata, unsigned int user)
file_hash_value = hash_string(lineno, file, FILEHASH);
set_magic_time(user_hash_value, file_hash_value, dev_hash_value);
}
EXPORT_SYMBOL(generate_resume_trace);
EXPORT_SYMBOL(generate_pm_trace);
extern char __tracedata_start, __tracedata_end;
static int show_file_hash(unsigned int value)

51
drivers/watchdog/iTCO_wdt.c
View File

@ -51,6 +51,7 @@
#define DRV_VERSION "1.11"
/* Includes */
#include <linux/acpi.h> /* For ACPI support */
#include <linux/module.h> /* For module specific items */
#include <linux/moduleparam.h> /* For new moduleparam's */
#include <linux/types.h> /* For standard types (like size_t) */
@ -103,6 +104,8 @@ static struct { /* this is private data for the iTCO_wdt device */
struct platform_device *dev;
/* the PCI-device */
struct pci_dev *pdev;
/* whether or not the watchdog has been suspended */
bool suspended;
} iTCO_wdt_private;
/* module parameters */
@ -571,12 +574,60 @@ static void iTCO_wdt_shutdown(struct platform_device *dev)
iTCO_wdt_stop(NULL);
}
#ifdef CONFIG_PM_SLEEP
/*
* Suspend-to-idle requires this, because it stops the ticks and timekeeping, so
* the watchdog cannot be pinged while in that state. In ACPI sleep states the
* watchdog is stopped by the platform firmware.
*/
#ifdef CONFIG_ACPI
static inline bool need_suspend(void)
{
return acpi_target_system_state() == ACPI_STATE_S0;
}
#else
static inline bool need_suspend(void) { return true; }
#endif
static int iTCO_wdt_suspend_noirq(struct device *dev)
{
int ret = 0;
iTCO_wdt_private.suspended = false;
if (watchdog_active(&iTCO_wdt_watchdog_dev) && need_suspend()) {
ret = iTCO_wdt_stop(&iTCO_wdt_watchdog_dev);
if (!ret)
iTCO_wdt_private.suspended = true;
}
return ret;
}
static int iTCO_wdt_resume_noirq(struct device *dev)
{
if (iTCO_wdt_private.suspended)
iTCO_wdt_start(&iTCO_wdt_watchdog_dev);
return 0;
}
static struct dev_pm_ops iTCO_wdt_pm = {
.suspend_noirq = iTCO_wdt_suspend_noirq,
.resume_noirq = iTCO_wdt_resume_noirq,
};
#define ITCO_WDT_PM_OPS (&iTCO_wdt_pm)
#else
#define ITCO_WDT_PM_OPS NULL
#endif /* CONFIG_PM_SLEEP */
static struct platform_driver iTCO_wdt_driver = {
.probe = iTCO_wdt_probe,
.remove = iTCO_wdt_remove,
.shutdown = iTCO_wdt_shutdown,
.driver = {
.name = DRV_NAME,
.pm = ITCO_WDT_PM_OPS,
},
};

9
include/linux/resume-trace.h → include/linux/pm-trace.h
View File

@ -1,8 +1,8 @@
#ifndef RESUME_TRACE_H
#define RESUME_TRACE_H
#ifndef PM_TRACE_H
#define PM_TRACE_H
#ifdef CONFIG_PM_TRACE
#include <asm/resume-trace.h>
#include <asm/pm-trace.h>
#include <linux/types.h>
extern int pm_trace_enabled;
@ -14,7 +14,7 @@ static inline int pm_trace_is_enabled(void)
struct device;
extern void set_trace_device(struct device *);
extern void generate_resume_trace(const void *tracedata, unsigned int user);
extern void generate_pm_trace(const void *tracedata, unsigned int user);
extern int show_trace_dev_match(char *buf, size_t size);
#define TRACE_DEVICE(dev) do { \
@ -28,6 +28,7 @@ static inline int pm_trace_is_enabled(void) { return 0; }
#define TRACE_DEVICE(dev) do { } while (0)
#define TRACE_RESUME(dev) do { } while (0)
#define TRACE_SUSPEND(dev) do { } while (0)
#endif

8
include/linux/pm.h
View File

@ -603,10 +603,18 @@ extern void dev_pm_put_subsys_data(struct device *dev);
* Power domains provide callbacks that are executed during system suspend,
* hibernation, system resume and during runtime PM transitions along with
* subsystem-level and driver-level callbacks.
*
* @detach: Called when removing a device from the domain.
* @activate: Called before executing probe routines for bus types and drivers.
* @sync: Called after successful driver probe.
* @dismiss: Called after unsuccessful driver probe and after driver removal.
*/
struct dev_pm_domain {
struct dev_pm_ops ops;
void (*detach)(struct device *dev, bool power_off);
int (*activate)(struct device *dev);
void (*sync)(struct device *dev);
void (*dismiss)(struct device *dev);
};
/*

6
include/linux/pm_domain.h
View File

@ -127,7 +127,7 @@ static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
return to_gpd_data(dev->power.subsys_data->domain_data);
}
extern struct generic_pm_domain *dev_to_genpd(struct device *dev);
extern struct generic_pm_domain *pm_genpd_lookup_dev(struct device *dev);
extern int __pm_genpd_add_device(struct generic_pm_domain *genpd,
struct device *dev,
struct gpd_timing_data *td);
@ -163,9 +163,9 @@ static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
{
return ERR_PTR(-ENOSYS);
}
static inline struct generic_pm_domain *dev_to_genpd(struct device *dev)
static inline struct generic_pm_domain *pm_genpd_lookup_dev(struct device *dev)
{
return ERR_PTR(-ENOSYS);
return NULL;
}
static inline int __pm_genpd_add_device(struct generic_pm_domain *genpd,
struct device *dev,

2
kernel/power/main.c
View File

@ -11,7 +11,7 @@
#include <linux/export.h>
#include <linux/kobject.h>
#include <linux/string.h>
#include <linux/resume-trace.h>
#include <linux/pm-trace.h>
#include <linux/workqueue.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>

13
kernel/power/suspend.c
View File

@ -28,6 +28,7 @@
#include <linux/ftrace.h>
#include <trace/events/power.h>
#include <linux/compiler.h>
#include <linux/moduleparam.h>
#include "power.h"
@ -233,12 +234,20 @@ static bool platform_suspend_again(suspend_state_t state)
suspend_ops->suspend_again() : false;
}
#ifdef CONFIG_PM_DEBUG
static unsigned int pm_test_delay = 5;
module_param(pm_test_delay, uint, 0644);
MODULE_PARM_DESC(pm_test_delay,
"Number of seconds to wait before resuming from suspend test");
#endif
static int suspend_test(int level)
{
#ifdef CONFIG_PM_DEBUG
if (pm_test_level == level) {
printk(KERN_INFO "suspend debug: Waiting for 5 seconds.\n");
mdelay(5000);
printk(KERN_INFO "suspend debug: Waiting for %d second(s).\n",
pm_test_delay);
mdelay(pm_test_delay * 1000);
return 1;
}
#endif /* !CONFIG_PM_DEBUG */