Merge branches 'release', 'dmi', 'idle' and 'misc' into release

Documentation/00-INDEX

@@ -109,6 +109,8 @@ cpu-hotplug.txt
 	- document describing CPU hotplug support in the Linux kernel.
 cpu-load.txt
 	- document describing how CPU load statistics are collected.
+cpuidle/
+	- info on CPU_IDLE, CPU idle state management subsystem.
 cpusets.txt
 	- documents the cpusets feature; assign CPUs and Mem to a set of tasks.
 cputopology.txt

Documentation/cpuidle/core.txt

+
+		Supporting multiple CPU idle levels in kernel
+
+				cpuidle
+
+General Information:
+
+Various CPUs today support multiple idle levels that are differentiated
+by varying exit latencies and power consumption during idle.
+cpuidle is a generic in-kernel infrastructure that separates
+idle policy (governor) from idle mechanism (driver) and provides a
+standardized infrastructure to support independent development of
+governors and drivers.
+
+cpuidle resides under drivers/cpuidle.
+
+Boot options:
+"cpuidle_sysfs_switch"
+enables current_governor interface in /sys/devices/system/cpu/cpuidle/,
+which can be used to switch governors at run time. This boot option
+is meant for developer testing only. In normal usage, kernel picks the
+best governor based on governor ratings.
+SEE ALSO: sysfs.txt in this directory.

Documentation/cpuidle/driver.txt

+
+
+		Supporting multiple CPU idle levels in kernel
+
+				cpuidle drivers
+
+
+
+
+cpuidle driver hooks into the cpuidle infrastructure and handles the
+architecture/platform dependent part of CPU idle states. Driver
+provides the platform idle state detection capability and also
+has mechanisms in place to support actual entry-exit into CPU idle states.
+
+cpuidle driver initializes the cpuidle_device structure for each CPU device
+and registers with cpuidle using cpuidle_register_device.
+
+It can also support the dynamic changes (like battery <-> AC), by using
+cpuidle_pause_and_lock, cpuidle_disable_device and cpuidle_enable_device,
+cpuidle_resume_and_unlock.
+
+Interfaces:
+extern int cpuidle_register_driver(struct cpuidle_driver *drv);
+extern void cpuidle_unregister_driver(struct cpuidle_driver *drv);
+extern int cpuidle_register_device(struct cpuidle_device *dev);
+extern void cpuidle_unregister_device(struct cpuidle_device *dev);
+
+extern void cpuidle_pause_and_lock(void);
+extern void cpuidle_resume_and_unlock(void);
+extern int cpuidle_enable_device(struct cpuidle_device *dev);
+extern void cpuidle_disable_device(struct cpuidle_device *dev);

Documentation/cpuidle/governor.txt

+
+
+
+		Supporting multiple CPU idle levels in kernel
+
+				cpuidle governors
+
+
+
+
+cpuidle governor is policy routine that decides what idle state to enter at
+any given time. cpuidle core uses different callbacks to the governor.
+
+* enable() to enable governor for a particular device
+* disable() to disable governor for a particular device
+* select() to select an idle state to enter
+* reflect() called after returning from the idle state, which can be used
+  by the governor for some record keeping.
+
+More than one governor can be registered at the same time and
+users can switch between drivers using /sysfs interface (when enabled).
+More than one governor part is supported for developers to easily experiment
+with different governors. By default, most optimal governor based on your
+kernel configuration and platform will be selected by cpuidle.
+
+Interfaces:
+extern int cpuidle_register_governor(struct cpuidle_governor *gov);
+extern void cpuidle_unregister_governor(struct cpuidle_governor *gov);
+struct cpuidle_governor

Documentation/cpuidle/sysfs.txt

+
+
+		Supporting multiple CPU idle levels in kernel
+
+				cpuidle sysfs
+
+System global cpuidle related information and tunables are under
+/sys/devices/system/cpu/cpuidle
+
+The current interfaces in this directory has self-explanatory names:
+* current_driver
+* current_governor_ro
+
+With cpuidle_sysfs_switch boot option (meant for developer testing)
+following objects are visible instead.
+* current_driver
+* available_governors
+* current_governor
+In this case users can switch the governor at run time by writing
+to current_governor.
+
+
+Per logical CPU specific cpuidle information are under
+/sys/devices/system/cpu/cpuX/cpuidle
+for each online cpu X
+
+--------------------------------------------------------------------------------
+# ls -lR /sys/devices/system/cpu/cpu0/cpuidle/
+/sys/devices/system/cpu/cpu0/cpuidle/:
+total 0
+drwxr-xr-x 2 root root 0 Feb  8 10:42 state0
+drwxr-xr-x 2 root root 0 Feb  8 10:42 state1
+drwxr-xr-x 2 root root 0 Feb  8 10:42 state2
+drwxr-xr-x 2 root root 0 Feb  8 10:42 state3
+
+/sys/devices/system/cpu/cpu0/cpuidle/state0:
+total 0
+-r--r--r-- 1 root root 4096 Feb  8 10:42 desc
+-r--r--r-- 1 root root 4096 Feb  8 10:42 latency
+-r--r--r-- 1 root root 4096 Feb  8 10:42 name
+-r--r--r-- 1 root root 4096 Feb  8 10:42 power
+-r--r--r-- 1 root root 4096 Feb  8 10:42 time
+-r--r--r-- 1 root root 4096 Feb  8 10:42 usage
+
+/sys/devices/system/cpu/cpu0/cpuidle/state1:
+total 0
+-r--r--r-- 1 root root 4096 Feb  8 10:42 desc
+-r--r--r-- 1 root root 4096 Feb  8 10:42 latency
+-r--r--r-- 1 root root 4096 Feb  8 10:42 name
+-r--r--r-- 1 root root 4096 Feb  8 10:42 power
+-r--r--r-- 1 root root 4096 Feb  8 10:42 time
+-r--r--r-- 1 root root 4096 Feb  8 10:42 usage
+
+/sys/devices/system/cpu/cpu0/cpuidle/state2:
+total 0
+-r--r--r-- 1 root root 4096 Feb  8 10:42 desc
+-r--r--r-- 1 root root 4096 Feb  8 10:42 latency
+-r--r--r-- 1 root root 4096 Feb  8 10:42 name
+-r--r--r-- 1 root root 4096 Feb  8 10:42 power
+-r--r--r-- 1 root root 4096 Feb  8 10:42 time
+-r--r--r-- 1 root root 4096 Feb  8 10:42 usage
+
+/sys/devices/system/cpu/cpu0/cpuidle/state3:
+total 0
+-r--r--r-- 1 root root 4096 Feb  8 10:42 desc
+-r--r--r-- 1 root root 4096 Feb  8 10:42 latency
+-r--r--r-- 1 root root 4096 Feb  8 10:42 name
+-r--r--r-- 1 root root 4096 Feb  8 10:42 power
+-r--r--r-- 1 root root 4096 Feb  8 10:42 time
+-r--r--r-- 1 root root 4096 Feb  8 10:42 usage
+--------------------------------------------------------------------------------
+
+
+* desc : Small description about the idle state (string)
+* latency : Latency to exit out of this idle state (in microseconds)
+* name : Name of the idle state (string)
+* power : Power consumed while in this idle state (in milliwatts)
+* time : Total time spent in this idle state (in microseconds)
+* usage : Number of times this state was entered (count)

arch/x86/kernel/acpi/cstate.c

@@ -126,6 +126,8 @@ int acpi_processor_ffh_cstate_probe(unsigned int cpu,
 		printk(KERN_DEBUG "Monitor-Mwait will be used to enter C-%d "
 		       "state\n", cx->type);
 	}
+	snprintf(cx->desc, ACPI_CX_DESC_LEN, "ACPI FFH INTEL MWAIT 0x%x",
+		 cx->address);
 
 out:
 	set_cpus_allowed(current, saved_mask);

drivers/acpi/event.c

@@ -110,7 +110,7 @@ static const struct file_operations acpi_system_event_ops = {
 #endif	/* CONFIG_ACPI_PROC_EVENT */
 
 /* ACPI notifier chain */
-BLOCKING_NOTIFIER_HEAD(acpi_chain_head);
+static BLOCKING_NOTIFIER_HEAD(acpi_chain_head);
 
 int acpi_notifier_call_chain(struct acpi_device *dev, u32 type, u32 data)
 {

drivers/acpi/hardware/hwsleep.c

@@ -616,6 +616,7 @@ acpi_status acpi_leave_sleep_state(u8 sleep_state)
 		return_ACPI_STATUS(status);
 	}
 
+	arg.integer.value = sleep_state;
 	status = acpi_evaluate_object(NULL, METHOD_NAME__WAK, &arg_list, NULL);
 	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 		ACPI_EXCEPTION((AE_INFO, status, "During Method _WAK"));

drivers/acpi/osl.c

@@ -325,7 +325,7 @@ acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 }
 
 #ifdef CONFIG_ACPI_CUSTOM_DSDT_INITRD
-struct acpi_table_header *acpi_find_dsdt_initrd(void)
+static struct acpi_table_header *acpi_find_dsdt_initrd(void)
 {
 	struct file *firmware_file;
 	mm_segment_t oldfs;
@@ -419,7 +419,7 @@ acpi_os_table_override(struct acpi_table_header * existing_table,
 }
 
 #ifdef CONFIG_ACPI_CUSTOM_DSDT_INITRD
-int __init acpi_no_initrd_override_setup(char *s)
+static int __init acpi_no_initrd_override_setup(char *s)
 {
 	acpi_no_initrd_override = 1;
 	return 1;

drivers/acpi/processor_idle.c

@@ -945,11 +945,16 @@ static int acpi_processor_get_power_info_cst(struct acpi_processor *pr)
 				 * Otherwise, ignore this info and continue.
 				 */
 				cx.entry_method = ACPI_CSTATE_HALT;
+				snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI HLT");
 			} else {
 				continue;
 			}
+		} else {
+			snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI IOPORT 0x%x",
+				 cx.address);
 		}
 
+
 		obj = &(element->package.elements[2]);
 		if (obj->type != ACPI_TYPE_INTEGER)
 			continue;
@@ -1420,6 +1425,14 @@ static int acpi_idle_enter_c1(struct cpuidle_device *dev,
 		return 0;
 
 	local_irq_disable();
+
+	/* Do not access any ACPI IO ports in suspend path */
+	if (acpi_idle_suspend) {
+		acpi_safe_halt();
+		local_irq_enable();
+		return 0;
+	}
+
 	if (pr->flags.bm_check)
 		acpi_idle_update_bm_rld(pr, cx);
 
@@ -1643,6 +1656,11 @@ static int acpi_processor_setup_cpuidle(struct acpi_processor *pr)
 		return -EINVAL;
 	}
 
+	for (i = 0; i < CPUIDLE_STATE_MAX; i++) {
+		dev->states[i].name[0] = '\0';
+		dev->states[i].desc[0] = '\0';
+	}
+
 	for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) {
 		cx = &pr->power.states[i];
 		state = &dev->states[count];
@@ -1659,6 +1677,7 @@ static int acpi_processor_setup_cpuidle(struct acpi_processor *pr)
 		cpuidle_set_statedata(state, cx);
 
 		snprintf(state->name, CPUIDLE_NAME_LEN, "C%d", i);
+		strncpy(state->desc, cx->desc, CPUIDLE_DESC_LEN);
 		state->exit_latency = cx->latency;
 		state->target_residency = cx->latency * latency_factor;
 		state->power_usage = cx->power;

drivers/cpuidle/cpuidle.c

@@ -219,7 +219,8 @@ static void poll_idle_init(struct cpuidle_device *dev)
 
 	cpuidle_set_statedata(state, NULL);
 
-	snprintf(state->name, CPUIDLE_NAME_LEN, "C0 (poll idle)");
+	snprintf(state->name, CPUIDLE_NAME_LEN, "C0");
+	snprintf(state->desc, CPUIDLE_DESC_LEN, "CPUIDLE CORE POLL IDLE");
 	state->exit_latency = 0;
 	state->target_residency = 0;
 	state->power_usage = -1;

drivers/cpuidle/sysfs.c

@@ -218,16 +218,23 @@ static ssize_t show_state_##_name(struct cpuidle_state *state, char *buf) \
 	return sprintf(buf, "%u\n", state->_name);\
 }
 
-static ssize_t show_state_name(struct cpuidle_state *state, char *buf)
-{
-	return sprintf(buf, "%s\n", state->name);
+#define define_show_state_str_function(_name) \
+static ssize_t show_state_##_name(struct cpuidle_state *state, char *buf) \
+{ \
+	if (state->_name[0] == '\0')\
+		return sprintf(buf, "<null>\n");\
+	return sprintf(buf, "%s\n", state->_name);\
 }
 
 define_show_state_function(exit_latency)
 define_show_state_function(power_usage)
 define_show_state_function(usage)
 define_show_state_function(time)
+define_show_state_str_function(name)
+define_show_state_str_function(desc)
+
 define_one_state_ro(name, show_state_name);
+define_one_state_ro(desc, show_state_desc);
 define_one_state_ro(latency, show_state_exit_latency);
 define_one_state_ro(power, show_state_power_usage);
 define_one_state_ro(usage, show_state_usage);
@@ -235,6 +242,7 @@ define_one_state_ro(time, show_state_time);
 
 static struct attribute *cpuidle_state_default_attrs[] = {
 	&attr_name.attr,
+	&attr_desc.attr,
 	&attr_latency.attr,
 	&attr_power.attr,
 	&attr_usage.attr,

drivers/misc/thinkpad_acpi.c

@@ -1689,7 +1689,7 @@ static ssize_t hotkey_wakeup_reason_show(struct device *dev,
 static struct device_attribute dev_attr_hotkey_wakeup_reason =
 	__ATTR(wakeup_reason, S_IRUGO, hotkey_wakeup_reason_show, NULL);
 
-void hotkey_wakeup_reason_notify_change(void)
+static void hotkey_wakeup_reason_notify_change(void)
 {
 	if (tp_features.hotkey_mask)
 		sysfs_notify(&tpacpi_pdev->dev.kobj, NULL,
@@ -1708,7 +1708,7 @@ static struct device_attribute dev_attr_hotkey_wakeup_hotunplug_complete =
 	__ATTR(wakeup_hotunplug_complete, S_IRUGO,
 	       hotkey_wakeup_hotunplug_complete_show, NULL);
 
-void hotkey_wakeup_hotunplug_complete_notify_change(void)
+static void hotkey_wakeup_hotunplug_complete_notify_change(void)
 {
 	if (tp_features.hotkey_mask)
 		sysfs_notify(&tpacpi_pdev->dev.kobj, NULL,

drivers/pnp/pnpacpi/core.c

@@ -36,7 +36,7 @@ static int num = 0;
  * have irqs (PIC, Timer) because we call acpi_register_gsi.
  * Finally, only devices that have a CRS method need to be in this list.
  */
-static struct __initdata acpi_device_id excluded_id_list[] = {
+static struct acpi_device_id excluded_id_list[] __initdata = {
 	{"PNP0C09", 0},		/* EC */
 	{"PNP0C0F", 0},		/* Link device */
 	{"PNP0000", 0},		/* PIC */

include/acpi/processor.h

@@ -32,9 +32,11 @@
 #define DOMAIN_COORD_TYPE_SW_ANY	0xfd
 #define DOMAIN_COORD_TYPE_HW_ALL	0xfe
 
-#define ACPI_CSTATE_SYSTEMIO	(0)
-#define ACPI_CSTATE_FFH		(1)
-#define ACPI_CSTATE_HALT	(2)
+#define ACPI_CSTATE_SYSTEMIO	0
+#define ACPI_CSTATE_FFH		1
+#define ACPI_CSTATE_HALT	2
+
+#define ACPI_CX_DESC_LEN	32
 
 /* Power Management */
 
@@ -74,6 +76,7 @@ struct acpi_processor_cx {
 	u64 time;
 	struct acpi_processor_cx_policy promotion;
 	struct acpi_processor_cx_policy demotion;
+	char desc[ACPI_CX_DESC_LEN];
 };
 
 struct acpi_processor_power {

include/linux/cpuidle.h

@@ -19,6 +19,7 @@
 
 #define CPUIDLE_STATE_MAX	8
 #define CPUIDLE_NAME_LEN	16
+#define CPUIDLE_DESC_LEN	32
 
 struct cpuidle_device;
 
@@ -29,6 +30,7 @@ struct cpuidle_device;
 
 struct cpuidle_state {
 	char		name[CPUIDLE_NAME_LEN];
+	char		desc[CPUIDLE_DESC_LEN];
 	void		*driver_data;
 
 	unsigned int	flags;