Merge tag 'pm+acpi-3.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull ACPI and power management updates from Rafael Wysocki:
 "The majority of this material spent some time in linux-next, some of
  it even several weeks.  There are a few relatively fresh commits in
  it, but they are mostly fixes and simple cleanups.

  ACPI took the lead this time, both in terms of the number of commits
  and the number of modified lines of code, cpufreq follows and there
  are a few changes in the PM core and in cpuidle too.

  A new feature that already got some LWN.net's attention is the device
  PM QoS extension allowing latency tolerance requirements to be
  propagated from leaf devices to their ancestors with hardware
  interfaces for specifying latency tolerance.  That should help systems
  with hardware-driven power management to avoid going too far with it
  in cases when there are latency tolerance constraints.

  There also are some significant changes in the ACPI core related to
  the way in which hotplug notifications are handled.  They affect PCI
  hotplug (ACPIPHP) and the ACPI dock station code too.  The bottom line
  is that all those notification now go through the root notify handler
  and are propagated to the interested subsystems by means of callbacks
  instead of having to install a notify handler for each device object
  that we can potentially get hotplug notifications for.

  In addition to that ACPICA will now advertise "Windows 2013"
  compatibility for _OSI, because some systems out there don't work
  correctly if that is not done (some of them don't even boot).

  On the system suspend side of things, all of the device suspend and
  resume callbacks, except for ->prepare() and ->complete(), are now
  going to be executed asynchronously as that turns out to speed up
  system suspend and resume on some platforms quite significantly and we
  have a few more optimizations in that area.

  Apart from that, there are some new device IDs and fixes and cleanups
  all over.  In particular, the system suspend and resume handling by
  cpufreq should be improved and the cpuidle menu governor should be a
  bit more robust now.

  Specifics:

   - Device PM QoS support for latency tolerance constraints on systems
     with hardware interfaces allowing such constraints to be specified.
     That is necessary to prevent hardware-driven power management from
     becoming overly aggressive on some systems and to prevent power
     management features leading to excessive latencies from being used
     in some cases.

   - Consolidation of the handling of ACPI hotplug notifications for
     device objects.  This causes all device hotplug notifications to go
     through the root notify handler (that was executed for all of them
     anyway before) that propagates them to individual subsystems, if
     necessary, by executing callbacks provided by those subsystems
     (those callbacks are associated with struct acpi_device objects
     during device enumeration).  As a result, the code in question
     becomes both smaller in size and more straightforward and all of
     those changes should not affect users.

   - ACPICA update, including fixes related to the handling of _PRT in
     cases when it is broken and the addition of "Windows 2013" to the
     list of supported "features" for _OSI (which is necessary to
     support systems that work incorrectly or don't even boot without
     it).  Changes from Bob Moore and Lv Zheng.

   - Consolidation of ACPI _OST handling from Jiang Liu.

   - ACPI battery and AC fixes allowing unusual system configurations to
     be handled by that code from Alexander Mezin.

   - New device IDs for the ACPI LPSS driver from Chiau Ee Chew.

   - ACPI fan and thermal optimizations related to system suspend and
     resume from Aaron Lu.

   - Cleanups related to ACPI video from Jean Delvare.

   - Assorted ACPI fixes and cleanups from Al Stone, Hanjun Guo, Lan
     Tianyu, Paul Bolle, Tomasz Nowicki.

   - Intel RAPL (Running Average Power Limits) driver cleanups from
     Jacob Pan.

   - intel_pstate fixes and cleanups from Dirk Brandewie.

   - cpufreq fixes related to system suspend/resume handling from Viresh
     Kumar.

   - cpufreq core fixes and cleanups from Viresh Kumar, Stratos
     Karafotis, Saravana Kannan, Rashika Kheria, Joe Perches.

   - cpufreq drivers updates from Viresh Kumar, Zhuoyu Zhang, Rob
     Herring.

   - cpuidle fixes related to the menu governor from Tuukka Tikkanen.

   - cpuidle fix related to coupled CPUs handling from Paul Burton.

   - Asynchronous execution of all device suspend and resume callbacks,
     except for ->prepare and ->complete, during system suspend and
     resume from Chuansheng Liu.

   - Delayed resuming of runtime-suspended devices during system suspend
     for the PCI bus type and ACPI PM domain.

   - New set of PM helper routines to allow device runtime PM callbacks
     to be used during system suspend and resume more easily from Ulf
     Hansson.

   - Assorted fixes and cleanups in the PM core from Geert Uytterhoeven,
     Prabhakar Lad, Philipp Zabel, Rashika Kheria, Sebastian Capella.

   - devfreq fix from Saravana Kannan"

* tag 'pm+acpi-3.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (162 commits)
  PM / devfreq: Rewrite devfreq_update_status() to fix multiple bugs
  PM / sleep: Correct whitespace errors in <linux/pm.h>
  intel_pstate: Set core to min P state during core offline
  cpufreq: Add stop CPU callback to cpufreq_driver interface
  cpufreq: Remove unnecessary braces
  cpufreq: Fix checkpatch errors and warnings
  cpufreq: powerpc: add cpufreq transition latency for FSL e500mc SoCs
  MAINTAINERS: Reorder maintainer addresses for PM and ACPI
  PM / Runtime: Update runtime_idle() documentation for return value meaning
  video / output: Drop display output class support
  fujitsu-laptop: Drop unneeded include
  acer-wmi: Stop selecting VIDEO_OUTPUT_CONTROL
  ACPI / gpu / drm: Stop selecting VIDEO_OUTPUT_CONTROL
  ACPI / video: fix ACPI_VIDEO dependencies
  cpufreq: remove unused notifier: CPUFREQ_{SUSPENDCHANGE|RESUMECHANGE}
  cpufreq: Do not allow ->setpolicy drivers to provide ->target
  cpufreq: arm_big_little: set 'physical_cluster' for each CPU
  cpufreq: arm_big_little: make vexpress driver depend on bL core driver
  ACPI / button: Add ACPI Button event via netlink routine
  ACPI: Remove duplicate definitions of PREFIX
  ...

1 files changed, 161 insertions, 100 deletions

diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 57b053f424d1..7efe546a8c42 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -41,6 +41,7 @@ static DEFINE_MUTEX(acpi_scan_lock);
 static LIST_HEAD(acpi_scan_handlers_list);
 DEFINE_MUTEX(acpi_device_lock);
 LIST_HEAD(acpi_wakeup_device_list);
+static DEFINE_MUTEX(acpi_hp_context_lock);
 
 struct acpi_device_bus_id{
 	char bus_id[15];
@@ -60,6 +61,27 @@ void acpi_scan_lock_release(void)
 }
 EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
 
+void acpi_lock_hp_context(void)
+{
+	mutex_lock(&acpi_hp_context_lock);
+}
+
+void acpi_unlock_hp_context(void)
+{
+	mutex_unlock(&acpi_hp_context_lock);
+}
+
+void acpi_initialize_hp_context(struct acpi_device *adev,
+				struct acpi_hotplug_context *hp,
+				int (*notify)(struct acpi_device *, u32),
+				void (*uevent)(struct acpi_device *, u32))
+{
+	acpi_lock_hp_context();
+	acpi_set_hp_context(adev, hp, notify, uevent, NULL);
+	acpi_unlock_hp_context();
+}
+EXPORT_SYMBOL_GPL(acpi_initialize_hp_context);
+
 int acpi_scan_add_handler(struct acpi_scan_handler *handler)
 {
 	if (!handler || !handler->attach)
@@ -439,90 +461,75 @@ static int acpi_scan_bus_check(struct acpi_device *adev)
 	return 0;
 }
 
-static void acpi_device_hotplug(void *data, u32 src)
+static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type)
 {
-	u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
-	struct acpi_device *adev = data;
-	int error;
-
-	lock_device_hotplug();
-	mutex_lock(&acpi_scan_lock);
-
-	/*
-	 * The device object's ACPI handle cannot become invalid as long as we
-	 * are holding acpi_scan_lock, but it may have become invalid before
-	 * that lock was acquired.
-	 */
-	if (adev->handle == INVALID_ACPI_HANDLE)
-		goto out;
-
-	switch (src) {
+	switch (type) {
 	case ACPI_NOTIFY_BUS_CHECK:
-		error = acpi_scan_bus_check(adev);
-		break;
+		return acpi_scan_bus_check(adev);
 	case ACPI_NOTIFY_DEVICE_CHECK:
-		error = acpi_scan_device_check(adev);
-		break;
+		return acpi_scan_device_check(adev);
 	case ACPI_NOTIFY_EJECT_REQUEST:
 	case ACPI_OST_EC_OSPM_EJECT:
-		error = acpi_scan_hot_remove(adev);
-		break;
-	default:
-		error = -EINVAL;
-		break;
+		if (adev->handler && !adev->handler->hotplug.enabled) {
+			dev_info(&adev->dev, "Eject disabled\n");
+			return -EPERM;
+		}
+		acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST,
+				  ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
+		return acpi_scan_hot_remove(adev);
 	}
-	if (!error)
-		ost_code = ACPI_OST_SC_SUCCESS;
-
- out:
-	acpi_evaluate_hotplug_ost(adev->handle, src, ost_code, NULL);
-	put_device(&adev->dev);
-	mutex_unlock(&acpi_scan_lock);
-	unlock_device_hotplug();
+	return -EINVAL;
 }
 
-static void acpi_hotplug_notify_cb(acpi_handle handle, u32 type, void *data)
+void acpi_device_hotplug(struct acpi_device *adev, u32 src)
 {
 	u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
-	struct acpi_device *adev;
-	acpi_status status;
+	int error = -ENODEV;
 
-	if (acpi_bus_get_device(handle, &adev))
-		goto err_out;
+	lock_device_hotplug();
+	mutex_lock(&acpi_scan_lock);
 
-	switch (type) {
-	case ACPI_NOTIFY_BUS_CHECK:
-		acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
-		break;
-	case ACPI_NOTIFY_DEVICE_CHECK:
-		acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
-		break;
-	case ACPI_NOTIFY_EJECT_REQUEST:
-		acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
-		if (!adev->handler)
-			goto err_out;
+	/*
+	 * The device object's ACPI handle cannot become invalid as long as we
+	 * are holding acpi_scan_lock, but it might have become invalid before
+	 * that lock was acquired.
+	 */
+	if (adev->handle == INVALID_ACPI_HANDLE)
+		goto err_out;
 
-		if (!adev->handler->hotplug.enabled) {
-			acpi_handle_err(handle, "Eject disabled\n");
+	if (adev->flags.is_dock_station) {
+		error = dock_notify(adev, src);
+	} else if (adev->flags.hotplug_notify) {
+		error = acpi_generic_hotplug_event(adev, src);
+		if (error == -EPERM) {
 			ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
 			goto err_out;
 		}
-		acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST,
-					  ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
-		break;
-	default:
-		/* non-hotplug event; possibly handled by other handler */
-		return;
-	}
-	get_device(&adev->dev);
-	status = acpi_hotplug_execute(acpi_device_hotplug, adev, type);
-	if (ACPI_SUCCESS(status))
-		return;
+	} else {
+		int (*notify)(struct acpi_device *, u32);
 
-	put_device(&adev->dev);
+		acpi_lock_hp_context();
+		notify = adev->hp ? adev->hp->notify : NULL;
+		acpi_unlock_hp_context();
+		/*
+		 * There may be additional notify handlers for device objects
+		 * without the .event() callback, so ignore them here.
+		 */
+		if (notify)
+			error = notify(adev, src);
+		else
+			goto out;
+	}
+	if (!error)
+		ost_code = ACPI_OST_SC_SUCCESS;
 
  err_out:
-	acpi_evaluate_hotplug_ost(handle, type, ost_code, NULL);
+	acpi_evaluate_ost(adev->handle, src, ost_code, NULL);
+
+ out:
+	acpi_bus_put_acpi_device(adev);
+	mutex_unlock(&acpi_scan_lock);
+	unlock_device_hotplug();
 }
 
 static ssize_t real_power_state_show(struct device *dev,
@@ -570,17 +577,14 @@ acpi_eject_store(struct device *d, struct device_attribute *attr,
 	if (ACPI_FAILURE(status) || !acpi_device->flags.ejectable)
 		return -ENODEV;
 
-	acpi_evaluate_hotplug_ost(acpi_device->handle, ACPI_OST_EC_OSPM_EJECT,
-				  ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
 	get_device(&acpi_device->dev);
-	status = acpi_hotplug_execute(acpi_device_hotplug, acpi_device,
-				      ACPI_OST_EC_OSPM_EJECT);
+	status = acpi_hotplug_schedule(acpi_device, ACPI_OST_EC_OSPM_EJECT);
 	if (ACPI_SUCCESS(status))
 		return count;
 
 	put_device(&acpi_device->dev);
-	acpi_evaluate_hotplug_ost(acpi_device->handle, ACPI_OST_EC_OSPM_EJECT,
-				  ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL);
+	acpi_evaluate_ost(acpi_device->handle, ACPI_OST_EC_OSPM_EJECT,
+			  ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL);
 	return status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN;
 }
 
@@ -1114,14 +1118,16 @@ static void acpi_scan_drop_device(acpi_handle handle, void *context)
 	mutex_unlock(&acpi_device_del_lock);
 }
 
-int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
+static int acpi_get_device_data(acpi_handle handle, struct acpi_device **device,
+				void (*callback)(void *))
 {
 	acpi_status status;
 
 	if (!device)
 		return -EINVAL;
 
-	status = acpi_get_data(handle, acpi_scan_drop_device, (void **)device);
+	status = acpi_get_data_full(handle, acpi_scan_drop_device,
+				    (void **)device, callback);
 	if (ACPI_FAILURE(status) || !*device) {
 		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
 				  handle));
@@ -1129,8 +1135,32 @@ int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
 	}
 	return 0;
 }
+
+int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
+{
+	return acpi_get_device_data(handle, device, NULL);
+}
 EXPORT_SYMBOL(acpi_bus_get_device);
 
+static void get_acpi_device(void *dev)
+{
+	if (dev)
+		get_device(&((struct acpi_device *)dev)->dev);
+}
+
+struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle)
+{
+	struct acpi_device *adev = NULL;
+
+	acpi_get_device_data(handle, &adev, get_acpi_device);
+	return adev;
+}
+
+void acpi_bus_put_acpi_device(struct acpi_device *adev)
+{
+	put_device(&adev->dev);
+}
+
 int acpi_device_add(struct acpi_device *device,
 		    void (*release)(struct device *))
 {
@@ -1641,6 +1671,27 @@ bool acpi_bay_match(acpi_handle handle)
 	return acpi_ata_match(phandle);
 }
 
+bool acpi_device_is_battery(struct acpi_device *adev)
+{
+	struct acpi_hardware_id *hwid;
+
+	list_for_each_entry(hwid, &adev->pnp.ids, list)
+		if (!strcmp("PNP0C0A", hwid->id))
+			return true;
+
+	return false;
+}
+
+static bool is_ejectable_bay(struct acpi_device *adev)
+{
+	acpi_handle handle = adev->handle;
+
+	if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
+		return true;
+
+	return acpi_bay_match(handle);
+}
+
 /*
  * acpi_dock_match - see if an acpi object has a _DCK method
  */
@@ -1706,6 +1757,20 @@ static bool acpi_ibm_smbus_match(acpi_handle handle)
 	return false;
 }
 
+static bool acpi_object_is_system_bus(acpi_handle handle)
+{
+	acpi_handle tmp;
+
+	if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
+	    tmp == handle)
+		return true;
+	if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
+	    tmp == handle)
+		return true;
+
+	return false;
+}
+
 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
 				int device_type)
 {
@@ -1757,8 +1822,10 @@ static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
 			acpi_add_id(pnp, ACPI_DOCK_HID);
 		else if (acpi_ibm_smbus_match(handle))
 			acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
-		else if (list_empty(&pnp->ids) && handle == ACPI_ROOT_OBJECT) {
-			acpi_add_id(pnp, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
+		else if (list_empty(&pnp->ids) &&
+			 acpi_object_is_system_bus(handle)) {
+			/* \_SB, \_TZ, LNXSYBUS */
+			acpi_add_id(pnp, ACPI_BUS_HID);
 			strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
 			strcpy(pnp->device_class, ACPI_BUS_CLASS);
 		}
@@ -1941,33 +2008,23 @@ void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
 	mutex_unlock(&acpi_scan_lock);
 }
 
-static void acpi_scan_init_hotplug(acpi_handle handle, int type)
+static void acpi_scan_init_hotplug(struct acpi_device *adev)
 {
-	struct acpi_device_pnp pnp = {};
 	struct acpi_hardware_id *hwid;
-	struct acpi_scan_handler *handler;
 
-	INIT_LIST_HEAD(&pnp.ids);
-	acpi_set_pnp_ids(handle, &pnp, type);
-
-	if (!pnp.type.hardware_id)
-		goto out;
+	if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
+		acpi_dock_add(adev);
+		return;
+	}
+	list_for_each_entry(hwid, &adev->pnp.ids, list) {
+		struct acpi_scan_handler *handler;
 
-	/*
-	 * This relies on the fact that acpi_install_notify_handler() will not
-	 * install the same notify handler routine twice for the same handle.
-	 */
-	list_for_each_entry(hwid, &pnp.ids, list) {
 		handler = acpi_scan_match_handler(hwid->id, NULL);
 		if (handler) {
-			acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
-					acpi_hotplug_notify_cb, handler);
+			adev->flags.hotplug_notify = true;
 			break;
 		}
 	}
-
-out:
-	acpi_free_pnp_ids(&pnp);
 }
 
 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
@@ -1991,12 +2048,12 @@ static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
 		return AE_OK;
 	}
 
-	acpi_scan_init_hotplug(handle, type);
-
 	acpi_add_single_object(&device, handle, type, sta);
 	if (!device)
 		return AE_CTRL_DEPTH;
 
+	acpi_scan_init_hotplug(device);
+
  out:
 	if (!*return_value)
 		*return_value = device;
@@ -2015,13 +2072,14 @@ static int acpi_scan_attach_handler(struct acpi_device *device)
 
 		handler = acpi_scan_match_handler(hwid->id, &devid);
 		if (handler) {
+			device->handler = handler;
 			ret = handler->attach(device, devid);
-			if (ret > 0) {
-				device->handler = handler;
+			if (ret > 0)
 				break;
-			} else if (ret < 0) {
+
+			device->handler = NULL;
+			if (ret < 0)
 				break;
-			}
 		}
 	}
 	return ret;
@@ -2030,8 +2088,12 @@ static int acpi_scan_attach_handler(struct acpi_device *device)
 static void acpi_bus_attach(struct acpi_device *device)
 {
 	struct acpi_device *child;
+	acpi_handle ejd;
 	int ret;
 
+	if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
+		register_dock_dependent_device(device, ejd);
+
 	acpi_bus_get_status(device);
 	/* Skip devices that are not present. */
 	if (!acpi_device_is_present(device)) {
@@ -2184,7 +2246,6 @@ int __init acpi_scan_init(void)
 	acpi_cmos_rtc_init();
 	acpi_container_init();
 	acpi_memory_hotplug_init();
-	acpi_dock_init();
 
 	mutex_lock(&acpi_scan_lock);
 	/*