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
  ...

7 files changed, 147 insertions, 142 deletions

diff --git a/kernel/pm_qos_params.c b/kernel/pm_qos_params.c
index aeaa7f846821..0da058bff8eb 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 265729966ece..4603f08dc47b 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 1832bd264219..aeabd26e3342 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 701853042c28..8eaba5f27b10 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 64db648ff911..ca0aacc24874 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 de6f86bfa303..2814c32aed51 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 18da702ec813..1ad48b3b9068 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();