---

yaml
---
r: 338330
b: refs/heads/master
c: 8966961
h: refs/heads/master
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 7bcb57cde66c19df378f3468ea342166a8a4504d
+refs/heads/master: 8966961b31c251b854169e9886394c2a20f2cea7

trunk/CREDITS

@@ -1823,6 +1823,11 @@ S: Kattreinstr 38
 S: D-64295
 S: Germany
 
+N: Avi Kivity
+E: avi.kivity@gmail.com
+D: Kernel-based Virtual Machine (KVM)
+S: Ra'annana, Israel
+
 N: Andi Kleen
 E: andi@firstfloor.org
 U: http://www.halobates.de

trunk/Documentation/ABI/testing/sysfs-class-devfreq

@@ -11,23 +11,24 @@ What:		/sys/class/devfreq/.../governor
 Date:		September 2011
 Contact:	MyungJoo Ham <myungjoo.ham@samsung.com>
 Description:
-		The /sys/class/devfreq/.../governor shows the name of the
+		The /sys/class/devfreq/.../governor show or set the name of the
 		governor used by the corresponding devfreq object.
 
 What:		/sys/class/devfreq/.../cur_freq
 Date:		September 2011
 Contact:	MyungJoo Ham <myungjoo.ham@samsung.com>
 Description:
 		The /sys/class/devfreq/.../cur_freq shows the current
-		frequency of the corresponding devfreq object.
+		frequency of the corresponding devfreq object. Same as
+		target_freq when get_cur_freq() is not implemented by
+		devfreq driver.
 
-What:		/sys/class/devfreq/.../central_polling
-Date:		September 2011
-Contact:	MyungJoo Ham <myungjoo.ham@samsung.com>
+What:		/sys/class/devfreq/.../target_freq
+Date:		September 2012
+Contact:	Rajagopal Venkat <rajagopal.venkat@linaro.org>
 Description:
-		The /sys/class/devfreq/.../central_polling shows whether
-		the devfreq ojbect is using devfreq-provided central
-		polling mechanism or not.
+		The /sys/class/devfreq/.../target_freq shows the next governor
+		predicted target frequency of the corresponding devfreq object.
 
 What:		/sys/class/devfreq/.../polling_interval
 Date:		September 2011
@@ -43,10 +44,37 @@ Description:
 		(/sys/class/devfreq/.../central_polling is 0), this value
 		may be useless.
 
+What:		/sys/class/devfreq/.../trans_stat
+Date:		October 2012
+Contact:	MyungJoo Ham <myungjoo.ham@samsung.com>
+Descrtiption:
+		This ABI shows the statistics of devfreq behavior on a
+		specific device. It shows the time spent in each state and
+		the number of transitions between states.
+		In order to activate this ABI, the devfreq target device
+		driver should provide the list of available frequencies
+		with its profile.
+
 What:		/sys/class/devfreq/.../userspace/set_freq
 Date:		September 2011
 Contact:	MyungJoo Ham <myungjoo.ham@samsung.com>
 Description:
 		The /sys/class/devfreq/.../userspace/set_freq shows and
 		sets the requested frequency for the devfreq object if
 		userspace governor is in effect.
+
+What:		/sys/class/devfreq/.../available_frequencies
+Date:		October 2012
+Contact:	Nishanth Menon <nm@ti.com>
+Description:
+		The /sys/class/devfreq/.../available_frequencies shows
+		the available frequencies of the corresponding devfreq object.
+		This is a snapshot of available frequencies and not limited
+		by the min/max frequency restrictions.
+
+What:		/sys/class/devfreq/.../available_governors
+Date:		October 2012
+Contact:	Nishanth Menon <nm@ti.com>
+Description:
+		The /sys/class/devfreq/.../available_governors shows
+		currently available governors in the system.

trunk/Documentation/ABI/testing/sysfs-devices-power

@@ -204,3 +204,34 @@ Description:
 
 		This attribute has no effect on system-wide suspend/resume and
 		hibernation.
+
+What:		/sys/devices/.../power/pm_qos_no_power_off
+Date:		September 2012
+Contact:	Rafael J. Wysocki <rjw@sisk.pl>
+Description:
+		The /sys/devices/.../power/pm_qos_no_power_off attribute
+		is used for manipulating the PM QoS "no power off" flag.  If
+		set, this flag indicates to the kernel that power should not
+		be removed entirely from the device.
+
+		Not all drivers support this attribute.  If it isn't supported,
+		it is not present.
+
+		This attribute has no effect on system-wide suspend/resume and
+		hibernation.
+
+What:		/sys/devices/.../power/pm_qos_remote_wakeup
+Date:		September 2012
+Contact:	Rafael J. Wysocki <rjw@sisk.pl>
+Description:
+		The /sys/devices/.../power/pm_qos_remote_wakeup attribute
+		is used for manipulating the PM QoS "remote wakeup required"
+		flag.  If set, this flag indicates to the kernel that the
+		device is a source of user events that have to be signaled from
+		its low-power states.
+
+		Not all drivers support this attribute.  If it isn't supported,
+		it is not present.
+
+		This attribute has no effect on system-wide suspend/resume and
+		hibernation.

trunk/Documentation/ABI/testing/sysfs-devices-sun

@@ -0,0 +1,14 @@
+Whatt:		/sys/devices/.../sun
+Date:		October 2012
+Contact:	Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
+Description:
+		The file contains a Slot-unique ID which provided by the _SUN
+		method in the ACPI namespace. The value is written in Advanced
+		Configuration and Power Interface Specification as follows:
+
+		"The _SUN value is required to be unique among the slots of
+		the same type. It is also recommended that this number match
+		the slot number printed on the physical slot whenever possible."
+
+		So reading the sysfs file, we can identify a physical position
+		of the slot in the system.

trunk/Documentation/DocBook/uio-howto.tmpl

@@ -719,6 +719,62 @@ framework to set up sysfs files for this region. Simply leave it alone.
 	</para>
 </sect1>
 
+<sect1 id="using uio_dmem_genirq">
+<title>Using uio_dmem_genirq for platform devices</title>
+	<para>
+	In addition to statically allocated memory ranges, they may also be
+	a desire to use dynamically allocated regions in a user space driver.
+	In particular, being able to access memory made available through the
+	dma-mapping API, may be particularly useful.  The
+	<varname>uio_dmem_genirq</varname> driver provides a way to accomplish
+	this.
+	</para>
+	<para>
+	This driver is used in a similar manner to the
+	<varname>"uio_pdrv_genirq"</varname> driver with respect to interrupt
+	configuration and handling.
+	</para>
+	<para>
+	Set the <varname>.name</varname> element of
+	<varname>struct platform_device</varname> to
+	<varname>"uio_dmem_genirq"</varname> to use this driver.
+	</para>
+	<para>
+	When using this driver, fill in the <varname>.platform_data</varname>
+	element of <varname>struct platform_device</varname>, which is of type
+	<varname>struct uio_dmem_genirq_pdata</varname> and which contains the
+	following elements:
+	</para>
+	<itemizedlist>
+	<listitem><varname>struct uio_info uioinfo</varname>: The same
+	structure used as the  <varname>uio_pdrv_genirq</varname> platform
+	data</listitem>
+	<listitem><varname>unsigned int *dynamic_region_sizes</varname>:
+	Pointer to list of sizes of dynamic memory regions to be mapped into
+	user space.
+	</listitem>
+	<listitem><varname>unsigned int num_dynamic_regions</varname>:
+	Number of elements in <varname>dynamic_region_sizes</varname> array.
+	</listitem>
+	</itemizedlist>
+	<para>
+	The dynamic regions defined in the platform data will be appended to
+	the <varname> mem[] </varname> array after the platform device
+	resources, which implies that the total number of static and dynamic
+	memory regions cannot exceed <varname>MAX_UIO_MAPS</varname>.
+	</para>
+	<para>
+	The dynamic memory regions will be allocated when the UIO device file,
+	<varname>/dev/uioX</varname> is opened.
+	Simiar to static memory resources, the memory region information for
+	dynamic regions is then visible via sysfs at
+	<varname>/sys/class/uio/uioX/maps/mapY/*</varname>.
+	The dynmaic memory regions will be freed when the UIO device file is
+	closed. When no processes are holding the device file open, the address
+	returned to userspace is ~0.
+	</para>
+</sect1>
+
 </chapter>
 
 <chapter id="userspace_driver" xreflabel="Writing a driver in user space">

trunk/Documentation/IRQ-domain.txt

@@ -7,6 +7,21 @@ systems with multiple interrupt controllers the kernel must ensure
 that each one gets assigned non-overlapping allocations of Linux
 IRQ numbers.
 
+The number of interrupt controllers registered as unique irqchips
+show a rising tendency: for example subdrivers of different kinds
+such as GPIO controllers avoid reimplementing identical callback
+mechanisms as the IRQ core system by modelling their interrupt
+handlers as irqchips, i.e. in effect cascading interrupt controllers.
+
+Here the interrupt number loose all kind of correspondence to
+hardware interrupt numbers: whereas in the past, IRQ numbers could
+be chosen so they matched the hardware IRQ line into the root
+interrupt controller (i.e. the component actually fireing the
+interrupt line to the CPU) nowadays this number is just a number.
+
+For this reason we need a mechanism to separate controller-local
+interrupt numbers, called hardware irq's, from Linux IRQ numbers.
+
 The irq_alloc_desc*() and irq_free_desc*() APIs provide allocation of
 irq numbers, but they don't provide any support for reverse mapping of
 the controller-local IRQ (hwirq) number into the Linux IRQ number
@@ -40,6 +55,10 @@ required hardware setup.
 When an interrupt is received, irq_find_mapping() function should
 be used to find the Linux IRQ number from the hwirq number.
 
+The irq_create_mapping() function must be called *atleast once*
+before any call to irq_find_mapping(), lest the descriptor will not
+be allocated.
+
 If the driver has the Linux IRQ number or the irq_data pointer, and
 needs to know the associated hwirq number (such as in the irq_chip
 callbacks) then it can be directly obtained from irq_data->hwirq.
@@ -119,4 +138,17 @@ numbers.
 
 Most users of legacy mappings should use irq_domain_add_simple() which
 will use a legacy domain only if an IRQ range is supplied by the
-system and will otherwise use a linear domain mapping.
+system and will otherwise use a linear domain mapping. The semantics
+of this call are such that if an IRQ range is specified then
+descriptors will be allocated on-the-fly for it, and if no range is
+specified it will fall through to irq_domain_add_linear() which meand
+*no* irq descriptors will be allocated.
+
+A typical use case for simple domains is where an irqchip provider
+is supporting both dynamic and static IRQ assignments.
+
+In order to avoid ending up in a situation where a linear domain is
+used and no descriptor gets allocated it is very important to make sure
+that the driver using the simple domain call irq_create_mapping()
+before any irq_find_mapping() since the latter will actually work
+for the static IRQ assignment case.