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/Documentation/ABI/testing/
Dconfigfs-most19 configure the buffer size for this channel
22 configure the sub-buffer size for this channel
27 configure number of buffers used for this
32 this channel
35 configure whether this link will be an input
39 configure DBR data buffer size (this is used
45 transmitted via USB (this is used for USB
58 write '1' to this attribute to trigger the
64 write '1' to this attribute to destroy an
74 configure the buffer size for this channel
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Dsysfs-devices-edac4 Description: This write-only control file will zero all the statistical
7 long since the last counter were reset. This is useful for
15 Description: This attribute file displays how many seconds have elapsed
16 since the last counter reset. This can be used with the error
22 Description: This attribute file displays the type of memory controller
28 Description: This attribute file displays, in count of megabytes, of memory
29 that this memory controller manages.
34 Description: This attribute file displays the total count of uncorrectable
35 errors that have occurred on this memory controller. If
36 panic_on_ue is set, this counter will not have a chance to
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Dsysfs-class-regulator7 state. This reports the regulator enable control, for
10 This will be one of the following strings:
26 NOTE: this field can be used in conjunction with microvolts
33 "status". This reports the current regulator status, for
36 This will be one of the following strings:
73 type. This holds the regulator type.
75 This will be one of the following strings:
97 microvolts. This holds the regulator output voltage setting
101 NOTE: This value should not be used to determine the regulator
102 output voltage level as this value is the same regardless of
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Dsysfs-driver-ppi6 This folder includes the attributes related with PPI (Physical
7 Presence Interface). Only if TPM is supported by BIOS, this
22 This attribute shows the version of the PPI supported by the
24 This file is readonly.
30 This attribute shows the request for an operation to be
34 This file can be read and written.
40 This attribute shows the response to the most recent operation
43 This file is readonly.
49 This attribute shows the platform-specific action that should
53 This file is readonly.
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Dsysfs-driver-ufs5 This file contains the auto-hibernate idle timer setting of a
18 Description: This file shows the device type. This is one of the UFS
27 Description: This file shows the device class. This is one of the UFS
36 Description: This file shows the UFS storage subclass. This is one of
45 Description: This file shows the protocol supported by an UFS device.
46 This is one of the UFS device descriptor parameters.
55 Description: This file shows number of logical units. This is one of
64 Description: This file shows number of well known logical units.
65 This is one of the UFS device descriptor parameters.
74 Description: This file shows value that indicates whether the device is
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Dsysfs-class-led13 For multicolor LEDs, writing to this file will update all
28 Writing 0 to this file clears active trigger.
30 Writing non-zero to this file while trigger is active changes the
40 Maximum brightness level for this LED, default is 255 (LED_FULL).
42 If the LED does not support different brightness levels, this
49 Last hardware set brightness level for this LED. Some LEDs
51 where this happens and the driver can detect this, will have
52 this file.
54 This file supports poll() to detect when the hardware changes
57 Reading this file will return the last brightness level set
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Dsysfs-bus-pci5 Writing a device location to this file will cause
7 this location. This is useful for overriding default
20 Writing a device location to this file will cause the
22 this location. This may be useful when overriding default
35 Writing a device ID to this file will attempt to
37 This may allow the driver to support more hardware than
53 Writing a device ID to this file will remove an ID
61 device. This is useful to ensure auto probing won't
70 Writing a non-zero value to this attribute will
78 Writing a zero value to this attribute disallows MSI and
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Dsysfs-devices-power28 by the contents of this file by writing either "enabled", or
32 events this file is not present. In that case the device cannot
50 drivers. Changing this attribute to "on" prevents the driver
70 The value of this attribute may be changed by writing either
76 devices this attribute is set to "enabled" by bus type code or
85 of signaled wakeup events associated with the device. This
87 the system from sleep states, this attribute is not present.
89 states, this attribute is empty.
97 the device was completed (at the kernel level). This attribute
99 system from sleep states, this attribute is not present. If
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Dsysfs-bus-vfio-mdev5 This directory contains list of directories of currently
17 This directory gives details of supported type, like name,
28 Writing UUID to this file will create mediated device of
29 type <type-id> for parent device <device>. This is a
40 This directory contains symbolic links pointing to mdev
41 devices sysfs entries which are created of this <type-id>.
47 Reading this attribute will show the number of mediated
48 devices of type <type-id> that can be created. This is a
54 creating mediated device of this type.
60 Reading this attribute will show VFIO device API supported
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Dsysfs-class-wakeup12 This file contains the name of the wakeup source.
18 This file contains the number of times the wakeup source was
25 This file contains the number of signaled wakeup events
32 This file contains the number of times the wakeup source might
39 This file contains the number of times the wakeup source's
46 This file contains the amount of time the wakeup source has
48 source is not active, this file contains '0'.
54 This file contains the total amount of time this wakeup source
61 This file contains the maximum amount of time this wakeup
68 This file contains the monotonic clock time when the wakeup
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Dsysfs-bus-rpmsg11 This sysfs entry contains the name of this channel.
22 a unique rpmsg address (a 32 bits integer). This way when
23 inbound messages arrive to this address, the rpmsg core
26 This sysfs entry contains the src (local) rpmsg address
27 of this channel. If it contains 0xffffffff, then an address
28 wasn't assigned (can happen if no driver exists for this
40 a unique rpmsg address (a 32 bits integer). This way when
41 inbound messages arrive to this address, the rpmsg core
44 This sysfs entry contains the dst (remote) rpmsg address
45 of this channel. If it contains 0xffffffff, then an address
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/Documentation/block/
Dqueue-sysfs.rst5 This text file will detail the queue files that are located in the sysfs tree
15 This file allows to turn off the disk entropy contribution. Default
16 value of this file is '1'(on).
20 This has different meaning depending on the type of the block device.
29 This file indicates whether the device supports Direct Access (DAX),
35 This shows the size of internal allocation of the device in bytes, if
45 requests issued to the device must not exceed this limit. A discard_max_bytes
50 While discard_max_hw_bytes is the hardware limit for the device, this
52 large discards are issued, setting this value lower will make Linux issue
68 This is the hardware sector size of the device, in bytes.
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/Documentation/scheduler/
Dsched-stats.rst18 domain. Domains have no particular names in this implementation, but
21 sometimes balancing only between pairs of cpus. At this time, there
29 which does this for many of the fields is available at
47 2) This field is a legacy array expiration count field used in the O(1)
59 7) sum of all time spent running by tasks on this processor (in jiffies)
60 8) sum of all time spent waiting to run by tasks on this processor (in
62 9) # of timeslices run on this cpu
73 The first field is a bit mask indicating what cpus this domain operates over.
78 1) # of times in this domain load_balance() was called when the
80 2) # of times in this domain load_balance() checked but found
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/Documentation/driver-api/media/drivers/
Dpvrusb2.rst11 This driver is intended for the "Hauppauge WinTV PVR USB 2.0", which
12 is a USB 2.0 hosted TV Tuner. This driver is a work in progress.
22 More information on this driver can be found at:
26 This driver has a strong separation of layers. They are very
76 pvrusb2-audio.[ch] - This is glue logic that resides between this
80 pvrusb2-context.[ch] - This module implements the context for an
84 interfaces tie into the driver through this module. This module
91 pvrusb2-debug.h - This header defines a printk() wrapper and a mask
95 pvrusb2-debugifc.[ch] - This module implements a crude command line
99 who has ever used this. It is mainly a debugging aid.
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/Documentation/filesystems/caching/
Dbackend-api.rst11 This API is declared in <linux/fscache-cache.h>.
18 cache the backend wants to make available. For instance, CacheFS does this in
33 this cache; and
49 master index in this cache. Netfs primary index entries will be created
53 * "tagname" which, if given, should be a text string naming this cache. If
54 this is NULL, the identifier will be used instead. For CacheFS, the
58 This function may return -ENOMEM if it ran out of memory or -EEXIST if the tag
65 A cache can be withdrawn from the system by calling this function with a
70 In CacheFS's case, this is called by put_super().
83 In either case, this may not be an appropriate context in which to access the
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/Documentation/userspace-api/media/cec/
Dcec-pin-error-inj.rst9 but some older devices aren't that fancy. However, this framework also
13 What makes doing this so interesting is that since we have full control
14 over the bus it is easy to support error injection. This is ideal to
19 support this framework.
44 # <op>[,<mode>] rx-low-drive <bit> force a low-drive condition at this bit position
60 # <op>[,<mode>] tx-short-bit <bit> make this bit shorter than allowed
61 # <op>[,<mode>] tx-long-bit <bit> make this bit longer than allowed
62 # <op>[,<mode>] tx-custom-bit <bit> send the custom pulse instead of this bit
66 # <op>[,<mode>] tx-last-bit <bit> stop sending after this bit
67 # <op>[,<mode>] tx-low-drive <bit> force a low-drive condition at this bit position
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/Documentation/core-api/
Dcachetlb.rst7 This document describes the cache/tlb flushing interfaces called
16 on all processors in the system. Don't let this scare you into
17 thinking SMP cache/tlb flushing must be so inefficient, this is in
21 for this address space on that cpu.
27 possible for stale translations to exist in this "TLB" cache.
34 The most severe flush of all. After this interface runs,
38 This is usually invoked when the kernel page tables are
43 This interface flushes an entire user address space from
44 the TLB. After running, this interface must make sure that
49 This interface is used to handle whole address space
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/Documentation/devicetree/bindings/powerpc/
Dibm,powerpc-cpu-features.txt2 This document is copied from OPAL firmware
12 This device tree binding describes CPU features available to software, with
15 More general description of design and implementation of this binding is
28 It is implemented as a child of the node "/cpus", but this must not be
40 This compatibility refers to backwards compatibility of the overall
41 design with parsers that behave according to these guidelines. This can
50 isa that the CPU is currently running in. This provides instruction set
104 This property describes the privilege levels and/or software components
118 This property describes the HV privilege support required to enable the
123 this feature.
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/Documentation/netlabel/
Ddraft-ietf-cipso-ipsecurity-01.txt12 This Internet Draft provides the high level specification for a Commercial
13 IP Security Option (CIPSO). This draft reflects the version as approved by
14 the CIPSO IETF Working Group. Distribution of this memo is unlimited.
16 This document is an Internet Draft. Internet Drafts are working documents
28 directory to learn the current status of this or any other Internet Draft.
37 IP datagrams to be labeled with security classifications. This option
54 to support multiple security policies. This Internet Draft provides the
76 This option permits security related information to be passed between
81 and their human readable equivalent. This authority will distribute that
87 This option MUST be copied on fragmentation. This option appears at most
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/Documentation/admin-guide/
Dmd.rst72 A possible loadlin line (Harald Hoyer <HarryH@Royal.Net>) looks like this::
82 This autodetection may be suppressed with the kernel parameter
93 undetectable data corruption. This is because the fact that it is
98 For this reason, md will normally refuse to start such an array. This
100 despite possible corruption. This is normally done with::
104 This option is not really available if the array has the root
105 filesystem on it. In order to support this booting from such an
138 An array should be created by a user-space tool. This will write
145 SET_ARRAY_INFO ioctl. This contains, in particular, a major and minor
151 Then each device is added using the ADD_NEW_DISK ioctl. This
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/Documentation/sound/designs/
Dtracepoints.rst12 This subsystem includes two categories of tracepoints; for state of PCM buffer
21 This category includes four tracepoints; ``hwptr``, ``applptr``, ``xrun`` and
27 This category includes two tracepoints; ``hw_mask_param`` and
33 substream. In this procedure, PCM hardware parameters are decided by
37 The parameters are described in struct snd_pcm_hw_params. This
46 Configurable. ALSA PCM core and some drivers handle this flag to select
49 Configurable. This type of parameter is described in
57 Configurable. This type of parameter is described in
74 Configurable. This is evaluated at ioctl(2) with
77 SNDRV_PCM_IOCTL_HW_PARAMS, this mask is ignored and all of parameters
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/Documentation/admin-guide/sysctl/
Dvm.rst15 This file contains the documentation for the sysctl files in
18 The files in this directory can be used to tune the operation
92 Systems running under overcommit 'never' should increase this to account
101 On x86_64 this is about 8MB.
105 On x86_64 this is about 128MB.
107 Changing this takes effect whenever an application requests memory.
122 blocks where possible. This can be important for example in the allocation of
128 This tunable takes a value in the range [0, 100] with a default value of
129 20. This tunable determines how aggressively compaction is done in the
130 background. On write of non zero value to this tunable will immediately
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/Documentation/ABI/obsolete/
Dsysfs-driver-hid-roccat-ryos4 Description: When written, this file lets one select which data from which
6 This file is writeonly.
14 This value is persistent, so its value determines the profile
24 Description: When written, this file lets one set the default of all keys for
27 Before reading this file, control has to be written to select
34 Description: When written, this file lets one set the function of the
37 Before reading this file, control has to be written to select
44 Description: When written, this file lets one set the function of the macro
47 Before reading this file, control has to be written to select
54 Description: When written, this file lets one set the function of the
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/Documentation/sound/hd-audio/
Dcontrols.rst6 This file explains the codec-specific mixer controls.
12 This is an enum control to change the surround-channel setup,
15 and "8ch". According to the configuration, this also controls the
19 This is an enum control to change the auto-mute behavior of the
21 and/or line-out jacks are available on a machine, this controls
39 This control enables/disables the analog-loopback circuit. This
42 and the normal PCM playback are exclusive, i.e. when this is on, you
47 corresponds to the center and the right to the LFE. When this is
51 When this control is ON, treat the headphone jacks as line-out
71 When this enum control is enabled, the headphone output is routed
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/Documentation/driver-api/rapidio/
Dtsi721.rst8 This driver implements all currently defined RapidIO mport callback functions.
12 To generate SRIO maintenance transactions this driver uses one of Tsi721 DMA
13 channels. This mechanism provides access to larger range of hop counts and
17 For inbound messages this driver uses destination ID matching to forward messages
24 - This parameter allows to control amount of debug information
25 generated by this device driver. This parameter is formed by set of
26 This parameter can be changed bit masks that correspond to the specific
29 This parameter can be changed dynamically.
33 - This parameter defines number of hardware buffer
46 DMA channels not selected by this mask will not be used by this device
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