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authorLinus Torvalds <torvalds@linux-foundation.org>2011-03-16 09:24:44 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-03-16 09:24:44 -0700
commitfc82e1d59a24cbac01c49d4eb3b28d6abc26a5f4 (patch)
tree5e01479d69e69dbbe483044b39afd2aa99d4f2b2 /kernel
parent48d5f6731837f0ec9a0e19ca763aa17d58385a98 (diff)
parentbea3864fb627d110933cfb8babe048b63c4fc76e (diff)
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/suspend-2.6
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/suspend-2.6: (21 commits) PM / Hibernate: Reduce autotuned default image size PM / Core: Introduce struct syscore_ops for core subsystems PM PM QoS: Make pm_qos settings readable PM / OPP: opp_find_freq_exact() documentation fix PM: Documentation/power/states.txt: fix repetition PM: Make system-wide PM and runtime PM treat subsystems consistently PM: Simplify kernel/power/Kconfig PM: Add support for device power domains PM: Drop pm_flags that is not necessary PM: Allow pm_runtime_suspend() to succeed during system suspend PM: Clean up PM_TRACE dependencies and drop unnecessary Kconfig option PM: Remove CONFIG_PM_OPS PM: Reorder power management Kconfig options PM: Make CONFIG_PM depend on (CONFIG_PM_SLEEP || CONFIG_PM_RUNTIME) PM / ACPI: Remove references to pm_flags from bus.c PM: Do not create wakeup sysfs files for devices that cannot wake up USB / Hub: Do not call device_set_wakeup_capable() under spinlock PM: Use appropriate printk() priority level in trace.c PM / Wakeup: Don't update events_check_enabled in pm_get_wakeup_count() PM / Wakeup: Make pm_save_wakeup_count() work as documented ...
Diffstat (limited to 'kernel')
-rw-r--r--kernel/pm_qos_params.c24
-rw-r--r--kernel/power/Kconfig237
-rw-r--r--kernel/power/hibernate.c9
-rw-r--r--kernel/power/main.c3
-rw-r--r--kernel/power/snapshot.c8
-rw-r--r--kernel/power/suspend.c4
-rw-r--r--kernel/sys.c4
7 files changed, 147 insertions, 142 deletions
diff --git a/kernel/pm_qos_params.c b/kernel/pm_qos_params.c
index aeaa7f84682..0da058bff8e 100644
--- a/kernel/pm_qos_params.c
+++ b/kernel/pm_qos_params.c
@@ -103,11 +103,14 @@ static struct pm_qos_object *pm_qos_array[] = {
static ssize_t pm_qos_power_write(struct file *filp, const char __user *buf,
size_t count, loff_t *f_pos);
+static ssize_t pm_qos_power_read(struct file *filp, char __user *buf,
+ size_t count, loff_t *f_pos);
static int pm_qos_power_open(struct inode *inode, struct file *filp);
static int pm_qos_power_release(struct inode *inode, struct file *filp);
static const struct file_operations pm_qos_power_fops = {
.write = pm_qos_power_write,
+ .read = pm_qos_power_read,
.open = pm_qos_power_open,
.release = pm_qos_power_release,
.llseek = noop_llseek,
@@ -376,6 +379,27 @@ static int pm_qos_power_release(struct inode *inode, struct file *filp)
}
+static ssize_t pm_qos_power_read(struct file *filp, char __user *buf,
+ size_t count, loff_t *f_pos)
+{
+ s32 value;
+ unsigned long flags;
+ struct pm_qos_object *o;
+ struct pm_qos_request_list *pm_qos_req = filp->private_data;;
+
+ if (!pm_qos_req)
+ return -EINVAL;
+ if (!pm_qos_request_active(pm_qos_req))
+ return -EINVAL;
+
+ o = pm_qos_array[pm_qos_req->pm_qos_class];
+ spin_lock_irqsave(&pm_qos_lock, flags);
+ value = pm_qos_get_value(o);
+ spin_unlock_irqrestore(&pm_qos_lock, flags);
+
+ return simple_read_from_buffer(buf, count, f_pos, &value, sizeof(s32));
+}
+
static ssize_t pm_qos_power_write(struct file *filp, const char __user *buf,
size_t count, loff_t *f_pos)
{
diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig
index 265729966ec..4603f08dc47 100644
--- a/kernel/power/Kconfig
+++ b/kernel/power/Kconfig
@@ -1,125 +1,12 @@
-config PM
- bool "Power Management support"
- depends on !IA64_HP_SIM
- ---help---
- "Power Management" means that parts of your computer are shut
- off or put into a power conserving "sleep" mode if they are not
- being used. There are two competing standards for doing this: APM
- and ACPI. If you want to use either one, say Y here and then also
- to the requisite support below.
-
- Power Management is most important for battery powered laptop
- computers; if you have a laptop, check out the Linux Laptop home
- page on the WWW at <http://www.linux-on-laptops.com/> or
- Tuxmobil - Linux on Mobile Computers at <http://www.tuxmobil.org/>
- and the Battery Powered Linux mini-HOWTO, available from
- <http://www.tldp.org/docs.html#howto>.
-
- Note that, even if you say N here, Linux on the x86 architecture
- will issue the hlt instruction if nothing is to be done, thereby
- sending the processor to sleep and saving power.
-
-config PM_DEBUG
- bool "Power Management Debug Support"
- depends on PM
- ---help---
- This option enables various debugging support in the Power Management
- code. This is helpful when debugging and reporting PM bugs, like
- suspend support.
-
-config PM_ADVANCED_DEBUG
- bool "Extra PM attributes in sysfs for low-level debugging/testing"
- depends on PM_DEBUG
- default n
- ---help---
- Add extra sysfs attributes allowing one to access some Power Management
- fields of device objects from user space. If you are not a kernel
- developer interested in debugging/testing Power Management, say "no".
-
-config PM_VERBOSE
- bool "Verbose Power Management debugging"
- depends on PM_DEBUG
- default n
- ---help---
- This option enables verbose messages from the Power Management code.
-
-config CAN_PM_TRACE
- def_bool y
- depends on PM_DEBUG && PM_SLEEP && EXPERIMENTAL
-
-config PM_TRACE
- bool
- help
- This enables code to save the last PM event point across
- reboot. The architecture needs to support this, x86 for
- example does by saving things in the RTC, see below.
-
- The architecture specific code must provide the extern
- functions from <linux/resume-trace.h> as well as the
- <asm/resume-trace.h> header with a TRACE_RESUME() macro.
-
- The way the information is presented is architecture-
- dependent, x86 will print the information during a
- late_initcall.
-
-config PM_TRACE_RTC
- bool "Suspend/resume event tracing"
- depends on CAN_PM_TRACE
- depends on X86
- select PM_TRACE
- default n
- ---help---
- This enables some cheesy code to save the last PM event point in the
- RTC across reboots, so that you can debug a machine that just hangs
- during suspend (or more commonly, during resume).
-
- To use this debugging feature you should attempt to suspend the
- machine, reboot it and then run
-
- dmesg -s 1000000 | grep 'hash matches'
-
- CAUTION: this option will cause your machine's real-time clock to be
- set to an invalid time after a resume.
-
-config PM_SLEEP_SMP
- bool
- depends on SMP
- depends on ARCH_SUSPEND_POSSIBLE || ARCH_HIBERNATION_POSSIBLE
- depends on PM_SLEEP
- select HOTPLUG
- select HOTPLUG_CPU
- default y
-
-config PM_SLEEP
- bool
- depends on SUSPEND || HIBERNATION || XEN_SAVE_RESTORE
- default y
-
-config PM_SLEEP_ADVANCED_DEBUG
- bool
- depends on PM_ADVANCED_DEBUG
- default n
-
config SUSPEND
bool "Suspend to RAM and standby"
- depends on PM && ARCH_SUSPEND_POSSIBLE
+ depends on ARCH_SUSPEND_POSSIBLE
default y
---help---
Allow the system to enter sleep states in which main memory is
powered and thus its contents are preserved, such as the
suspend-to-RAM state (e.g. the ACPI S3 state).
-config PM_TEST_SUSPEND
- bool "Test suspend/resume and wakealarm during bootup"
- depends on SUSPEND && PM_DEBUG && RTC_CLASS=y
- ---help---
- This option will let you suspend your machine during bootup, and
- make it wake up a few seconds later using an RTC wakeup alarm.
- Enable this with a kernel parameter like "test_suspend=mem".
-
- You probably want to have your system's RTC driver statically
- linked, ensuring that it's available when this test runs.
-
config SUSPEND_FREEZER
bool "Enable freezer for suspend to RAM/standby" \
if ARCH_WANTS_FREEZER_CONTROL || BROKEN
@@ -133,7 +20,7 @@ config SUSPEND_FREEZER
config HIBERNATION
bool "Hibernation (aka 'suspend to disk')"
- depends on PM && SWAP && ARCH_HIBERNATION_POSSIBLE
+ depends on SWAP && ARCH_HIBERNATION_POSSIBLE
select LZO_COMPRESS
select LZO_DECOMPRESS
---help---
@@ -196,6 +83,106 @@ config PM_STD_PARTITION
suspended image to. It will simply pick the first available swap
device.
+config PM_SLEEP
+ def_bool y
+ depends on SUSPEND || HIBERNATION || XEN_SAVE_RESTORE
+
+config PM_SLEEP_SMP
+ def_bool y
+ depends on SMP
+ depends on ARCH_SUSPEND_POSSIBLE || ARCH_HIBERNATION_POSSIBLE
+ depends on PM_SLEEP
+ select HOTPLUG
+ select HOTPLUG_CPU
+
+config PM_RUNTIME
+ bool "Run-time PM core functionality"
+ depends on !IA64_HP_SIM
+ ---help---
+ Enable functionality allowing I/O devices to be put into energy-saving
+ (low power) states at run time (or autosuspended) after a specified
+ period of inactivity and woken up in response to a hardware-generated
+ wake-up event or a driver's request.
+
+ Hardware support is generally required for this functionality to work
+ and the bus type drivers of the buses the devices are on are
+ responsible for the actual handling of the autosuspend requests and
+ wake-up events.
+
+config PM
+ def_bool y
+ depends on PM_SLEEP || PM_RUNTIME
+
+config PM_DEBUG
+ bool "Power Management Debug Support"
+ depends on PM
+ ---help---
+ This option enables various debugging support in the Power Management
+ code. This is helpful when debugging and reporting PM bugs, like
+ suspend support.
+
+config PM_VERBOSE
+ bool "Verbose Power Management debugging"
+ depends on PM_DEBUG
+ ---help---
+ This option enables verbose messages from the Power Management code.
+
+config PM_ADVANCED_DEBUG
+ bool "Extra PM attributes in sysfs for low-level debugging/testing"
+ depends on PM_DEBUG
+ ---help---
+ Add extra sysfs attributes allowing one to access some Power Management
+ fields of device objects from user space. If you are not a kernel
+ developer interested in debugging/testing Power Management, say "no".
+
+config PM_TEST_SUSPEND
+ bool "Test suspend/resume and wakealarm during bootup"
+ depends on SUSPEND && PM_DEBUG && RTC_CLASS=y
+ ---help---
+ This option will let you suspend your machine during bootup, and
+ make it wake up a few seconds later using an RTC wakeup alarm.
+ Enable this with a kernel parameter like "test_suspend=mem".
+
+ You probably want to have your system's RTC driver statically
+ linked, ensuring that it's available when this test runs.
+
+config CAN_PM_TRACE
+ def_bool y
+ depends on PM_DEBUG && PM_SLEEP
+
+config PM_TRACE
+ bool
+ help
+ This enables code to save the last PM event point across
+ reboot. The architecture needs to support this, x86 for
+ example does by saving things in the RTC, see below.
+
+ The architecture specific code must provide the extern
+ functions from <linux/resume-trace.h> as well as the
+ <asm/resume-trace.h> header with a TRACE_RESUME() macro.
+
+ The way the information is presented is architecture-
+ dependent, x86 will print the information during a
+ late_initcall.
+
+config PM_TRACE_RTC
+ bool "Suspend/resume event tracing"
+ depends on CAN_PM_TRACE
+ depends on X86
+ select PM_TRACE
+ ---help---
+ This enables some cheesy code to save the last PM event point in the
+ RTC across reboots, so that you can debug a machine that just hangs
+ during suspend (or more commonly, during resume).
+
+ To use this debugging feature you should attempt to suspend the
+ machine, reboot it and then run
+
+ dmesg -s 1000000 | grep 'hash matches'
+
+ CAUTION: this option will cause your machine's real-time clock to be
+ set to an invalid time after a resume.
+
config APM_EMULATION
tristate "Advanced Power Management Emulation"
depends on PM && SYS_SUPPORTS_APM_EMULATION
@@ -222,31 +209,11 @@ config APM_EMULATION
anything, try disabling/enabling this option (or disabling/enabling
APM in your BIOS).
-config PM_RUNTIME
- bool "Run-time PM core functionality"
- depends on PM
- ---help---
- Enable functionality allowing I/O devices to be put into energy-saving
- (low power) states at run time (or autosuspended) after a specified
- period of inactivity and woken up in response to a hardware-generated
- wake-up event or a driver's request.
-
- Hardware support is generally required for this functionality to work
- and the bus type drivers of the buses the devices are on are
- responsible for the actual handling of the autosuspend requests and
- wake-up events.
-
-config PM_OPS
- bool
- depends on PM_SLEEP || PM_RUNTIME
- default y
-
config ARCH_HAS_OPP
bool
config PM_OPP
bool "Operating Performance Point (OPP) Layer library"
- depends on PM
depends on ARCH_HAS_OPP
---help---
SOCs have a standard set of tuples consisting of frequency and
diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index 1832bd26421..aeabd26e334 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -23,6 +23,7 @@
#include <linux/cpu.h>
#include <linux/freezer.h>
#include <linux/gfp.h>
+#include <linux/syscore_ops.h>
#include <scsi/scsi_scan.h>
#include <asm/suspend.h>
@@ -272,6 +273,8 @@ static int create_image(int platform_mode)
local_irq_disable();
error = sysdev_suspend(PMSG_FREEZE);
+ if (!error)
+ error = syscore_suspend();
if (error) {
printk(KERN_ERR "PM: Some system devices failed to power down, "
"aborting hibernation\n");
@@ -295,6 +298,7 @@ static int create_image(int platform_mode)
}
Power_up:
+ syscore_resume();
sysdev_resume();
/* NOTE: dpm_resume_noirq() is just a resume() for devices
* that suspended with irqs off ... no overall powerup.
@@ -403,6 +407,8 @@ static int resume_target_kernel(bool platform_mode)
local_irq_disable();
error = sysdev_suspend(PMSG_QUIESCE);
+ if (!error)
+ error = syscore_suspend();
if (error)
goto Enable_irqs;
@@ -429,6 +435,7 @@ static int resume_target_kernel(bool platform_mode)
restore_processor_state();
touch_softlockup_watchdog();
+ syscore_resume();
sysdev_resume();
Enable_irqs:
@@ -516,6 +523,7 @@ int hibernation_platform_enter(void)
local_irq_disable();
sysdev_suspend(PMSG_HIBERNATE);
+ syscore_suspend();
if (pm_wakeup_pending()) {
error = -EAGAIN;
goto Power_up;
@@ -526,6 +534,7 @@ int hibernation_platform_enter(void)
while (1);
Power_up:
+ syscore_resume();
sysdev_resume();
local_irq_enable();
enable_nonboot_cpus();
diff --git a/kernel/power/main.c b/kernel/power/main.c
index 701853042c2..8eaba5f27b1 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -17,9 +17,6 @@
DEFINE_MUTEX(pm_mutex);
-unsigned int pm_flags;
-EXPORT_SYMBOL(pm_flags);
-
#ifdef CONFIG_PM_SLEEP
/* Routines for PM-transition notifications */
diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
index 64db648ff91..ca0aacc2487 100644
--- a/kernel/power/snapshot.c
+++ b/kernel/power/snapshot.c
@@ -42,15 +42,15 @@ static void swsusp_unset_page_forbidden(struct page *);
/*
* Preferred image size in bytes (tunable via /sys/power/image_size).
- * When it is set to N, swsusp will do its best to ensure the image
- * size will not exceed N bytes, but if that is impossible, it will
- * try to create the smallest image possible.
+ * When it is set to N, the image creating code will do its best to
+ * ensure the image size will not exceed N bytes, but if that is
+ * impossible, it will try to create the smallest image possible.
*/
unsigned long image_size;
void __init hibernate_image_size_init(void)
{
- image_size = ((totalram_pages * 2) / 5) * PAGE_SIZE;
+ image_size = (totalram_pages / 3) * PAGE_SIZE;
}
/* List of PBEs needed for restoring the pages that were allocated before
diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c
index de6f86bfa30..2814c32aed5 100644
--- a/kernel/power/suspend.c
+++ b/kernel/power/suspend.c
@@ -22,6 +22,7 @@
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/suspend.h>
+#include <linux/syscore_ops.h>
#include <trace/events/power.h>
#include "power.h"
@@ -163,11 +164,14 @@ static int suspend_enter(suspend_state_t state)
BUG_ON(!irqs_disabled());
error = sysdev_suspend(PMSG_SUSPEND);
+ if (!error)
+ error = syscore_suspend();
if (!error) {
if (!(suspend_test(TEST_CORE) || pm_wakeup_pending())) {
error = suspend_ops->enter(state);
events_check_enabled = false;
}
+ syscore_resume();
sysdev_resume();
}
diff --git a/kernel/sys.c b/kernel/sys.c
index 18da702ec81..1ad48b3b906 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -37,6 +37,7 @@
#include <linux/ptrace.h>
#include <linux/fs_struct.h>
#include <linux/gfp.h>
+#include <linux/syscore_ops.h>
#include <linux/compat.h>
#include <linux/syscalls.h>
@@ -298,6 +299,7 @@ void kernel_restart_prepare(char *cmd)
system_state = SYSTEM_RESTART;
device_shutdown();
sysdev_shutdown();
+ syscore_shutdown();
}
/**
@@ -336,6 +338,7 @@ void kernel_halt(void)
{
kernel_shutdown_prepare(SYSTEM_HALT);
sysdev_shutdown();
+ syscore_shutdown();
printk(KERN_EMERG "System halted.\n");
kmsg_dump(KMSG_DUMP_HALT);
machine_halt();
@@ -355,6 +358,7 @@ void kernel_power_off(void)
pm_power_off_prepare();
disable_nonboot_cpus();
sysdev_shutdown();
+ syscore_shutdown();
printk(KERN_EMERG "Power down.\n");
kmsg_dump(KMSG_DUMP_POWEROFF);
machine_power_off();