Merge tag 'pm+acpi-3.16-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull more ACPI and power management updates from Rafael Wysocki:
 "These are fixups on top of the previous PM+ACPI pull request,
  regression fixes (ACPI hotplug, cpufreq ppc-corenet), other bug fixes
  (ACPI reset, cpufreq), new PM trace points for system suspend
  profiling and a copyright notice update.

  Specifics:

   - I didn't remember correctly that the Hans de Goede's ACPI video
     patches actually didn't flip the video.use_native_backlight
     default, although we had discussed that and decided to do that.
     Since I said we would do that in the previous PM+ACPI pull request,
     make that change for real now.

   - ACPI bus check notifications for PCI host bridges don't cause the
     bus below the host bridge to be checked for changes as they should
     because of a mistake in the ACPI-based PCI hotplug (ACPIPHP)
     subsystem that forgets to add hotplug contexts to PCI host bridge
     ACPI device objects.  Create hotplug contexts for PCI host bridges
     too as appropriate.

   - Revert recent cpufreq commit related to the big.LITTLE cpufreq
     driver that breaks arm64 builds.

   - Fix for a regression in the ppc-corenet cpufreq driver introduced
     during the 3.15 cycle and causing the driver to use the remainder
     from do_div instead of the quotient.  From Ed Swarthout.

   - Resets triggered by panic activate a BUG_ON() in vmalloc.c on
     systems where the ACPI reset register is located in memory address
     space.  Fix from Randy Wright.

   - Fix for a problem with cpufreq governors that decisions made by
     them may be suboptimal due to the fact that deferrable timers are
     used by them for CPU load sampling.  From Srivatsa S Bhat.

   - Fix for a problem with the Tegra cpufreq driver where the CPU
     frequency is temporarily switched to a "stable" level that is
     different from both the initial and target frequencies during
     transitions which causes udelay() to expire earlier than it should
     sometimes.  From Viresh Kumar.

   - New trace points and rework of some existing trace points for
     system suspend/resume profiling from Todd Brandt.

   - Assorted cpufreq fixes and cleanups from Stratos Karafotis and
     Viresh Kumar.

   - Copyright notice update for suspend-and-cpuhotplug.txt from
     Srivatsa S Bhat"

* tag 'pm+acpi-3.16-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  ACPI / hotplug / PCI: Add hotplug contexts to PCI host bridges
  PM / sleep: trace events for device PM callbacks
  cpufreq: cpufreq-cpu0: remove dependency on THERMAL and REGULATOR
  cpufreq: tegra: update comment for clarity
  cpufreq: intel_pstate: Remove duplicate CPU ID check
  cpufreq: Mark CPU0 driver with CPUFREQ_NEED_INITIAL_FREQ_CHECK flag
  PM / Documentation: Update copyright in suspend-and-cpuhotplug.txt
  cpufreq: governor: remove copy_prev_load from 'struct cpu_dbs_common_info'
  cpufreq: governor: Be friendly towards latency-sensitive bursty workloads
  PM / sleep: trace events for suspend/resume
  cpufreq: ppc-corenet-cpu-freq: do_div use quotient
  Revert "cpufreq: Enable big.LITTLE cpufreq driver on arm64"
  cpufreq: Tegra: implement intermediate frequency callbacks
  cpufreq: add support for intermediate (stable) frequencies
  ACPI / video: Change the default for video.use_native_backlight to 1
  ACPI: Fix bug when ACPI reset register is implemented in system memory

4 files changed, 23 insertions, 2 deletions

diff --git a/kernel/cpu.c b/kernel/cpu.c
index acf791c55b71..a343bde710b1 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -20,6 +20,7 @@
 #include <linux/gfp.h>
 #include <linux/suspend.h>
 #include <linux/lockdep.h>
+#include <trace/events/power.h>
 
 #include "smpboot.h"
 
@@ -520,7 +521,9 @@ int disable_nonboot_cpus(void)
         for_each_online_cpu(cpu) {
                 if (cpu == first_cpu)
                         continue;
+                trace_suspend_resume(TPS("CPU_OFF"), cpu, true);
                 error = _cpu_down(cpu, 1);
+                trace_suspend_resume(TPS("CPU_OFF"), cpu, false);
                 if (!error)
                         cpumask_set_cpu(cpu, frozen_cpus);
                 else {
@@ -563,7 +566,9 @@ void __ref enable_nonboot_cpus(void)
         arch_enable_nonboot_cpus_begin();
 
         for_each_cpu(cpu, frozen_cpus) {
+                trace_suspend_resume(TPS("CPU_ON"), cpu, true);
                 error = _cpu_up(cpu, 1);
+                trace_suspend_resume(TPS("CPU_ON"), cpu, false);
                 if (!error) {
                         pr_info("CPU%d is up\n", cpu);
                         continue;
diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index df88d55dc436..49e0a20fd010 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -28,6 +28,7 @@
 #include <linux/syscore_ops.h>
 #include <linux/ctype.h>
 #include <linux/genhd.h>
+#include <trace/events/power.h>
 
 #include "power.h"
 
@@ -292,7 +293,9 @@ static int create_image(int platform_mode)
 
         in_suspend = 1;
         save_processor_state();
+        trace_suspend_resume(TPS("machine_suspend"), PM_EVENT_HIBERNATE, true);
         error = swsusp_arch_suspend();
+        trace_suspend_resume(TPS("machine_suspend"), PM_EVENT_HIBERNATE, false);
         if (error)
                 printk(KERN_ERR "PM: Error %d creating hibernation image\n",
                         error);
diff --git a/kernel/power/process.c b/kernel/power/process.c
index 06ec8869dbf1..0ca8d83e2369 100644
--- a/kernel/power/process.c
+++ b/kernel/power/process.c
@@ -17,6 +17,7 @@
 #include <linux/delay.h>
 #include <linux/workqueue.h>
 #include <linux/kmod.h>
+#include <trace/events/power.h>
 
 /* 
  * Timeout for stopping processes
@@ -175,6 +176,7 @@ void thaw_processes(void)
         struct task_struct *g, *p;
         struct task_struct *curr = current;
 
+        trace_suspend_resume(TPS("thaw_processes"), 0, true);
         if (pm_freezing)
                 atomic_dec(&system_freezing_cnt);
         pm_freezing = false;
@@ -201,6 +203,7 @@ void thaw_processes(void)
 
         schedule();
         printk("done.\n");
+        trace_suspend_resume(TPS("thaw_processes"), 0, false);
 }
 
 void thaw_kernel_threads(void)
diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c
index 963e6d0f050b..4dd8822f732a 100644
--- a/kernel/power/suspend.c
+++ b/kernel/power/suspend.c
@@ -177,7 +177,9 @@ static int suspend_prepare(suspend_state_t state)
         if (error)
                 goto Finish;
 
+        trace_suspend_resume(TPS("freeze_processes"), 0, true);
         error = suspend_freeze_processes();
+        trace_suspend_resume(TPS("freeze_processes"), 0, false);
         if (!error)
                 return 0;
 
@@ -240,7 +242,9 @@ static int suspend_enter(suspend_state_t state, bool *wakeup)
          * all the devices are suspended.
          */
         if (state == PM_SUSPEND_FREEZE) {
+                trace_suspend_resume(TPS("machine_suspend"), state, true);
                 freeze_enter();
+                trace_suspend_resume(TPS("machine_suspend"), state, false);
                 goto Platform_wake;
         }
 
@@ -256,7 +260,11 @@ static int suspend_enter(suspend_state_t state, bool *wakeup)
         if (!error) {
                 *wakeup = pm_wakeup_pending();
                 if (!(suspend_test(TEST_CORE) || *wakeup)) {
+                        trace_suspend_resume(TPS("machine_suspend"),
+                                state, true);
                         error = suspend_ops->enter(state);
+                        trace_suspend_resume(TPS("machine_suspend"),
+                                state, false);
                         events_check_enabled = false;
                 }
                 syscore_resume();
@@ -294,7 +302,6 @@ int suspend_devices_and_enter(suspend_state_t state)
         if (need_suspend_ops(state) && !suspend_ops)
                 return -ENOSYS;
 
-        trace_machine_suspend(state);
         if (need_suspend_ops(state) && suspend_ops->begin) {
                 error = suspend_ops->begin(state);
                 if (error)
@@ -331,7 +338,6 @@ int suspend_devices_and_enter(suspend_state_t state)
         else if (state == PM_SUSPEND_FREEZE && freeze_ops->end)
                 freeze_ops->end();
 
-        trace_machine_suspend(PWR_EVENT_EXIT);
         return error;
 
  Recover_platform:
@@ -365,6 +371,7 @@ static int enter_state(suspend_state_t state)
 {
         int error;
 
+        trace_suspend_resume(TPS("suspend_enter"), state, true);
         if (state == PM_SUSPEND_FREEZE) {
 #ifdef CONFIG_PM_DEBUG
                 if (pm_test_level != TEST_NONE && pm_test_level <= TEST_CPUS) {
@@ -382,9 +389,11 @@ static int enter_state(suspend_state_t state)
         if (state == PM_SUSPEND_FREEZE)
                 freeze_begin();
 
+        trace_suspend_resume(TPS("sync_filesystems"), 0, true);
         printk(KERN_INFO "PM: Syncing filesystems ... ");
         sys_sync();
         printk("done.\n");
+        trace_suspend_resume(TPS("sync_filesystems"), 0, false);
 
         pr_debug("PM: Preparing system for %s sleep\n", pm_states[state].label);
         error = suspend_prepare(state);
@@ -394,6 +403,7 @@ static int enter_state(suspend_state_t state)
         if (suspend_test(TEST_FREEZER))
                 goto Finish;
 
+        trace_suspend_resume(TPS("suspend_enter"), state, false);
         pr_debug("PM: Entering %s sleep\n", pm_states[state].label);
         pm_restrict_gfp_mask();
         error = suspend_devices_and_enter(state);