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/Documentation/devicetree/bindings/regulator/
Dregulator.yaml1 # SPDX-License-Identifier: GPL-2.0
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Liam Girdwood <lgirdwood@gmail.com>
11 - Mark Brown <broonie@kernel.org>
14 regulator-name:
18 regulator-min-microvolt:
19 description: smallest voltage consumers may set
21 regulator-max-microvolt:
22 description: largest voltage consumers may set
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/Documentation/leds/
Dledtrig-transient.rst8 to be off. The delay_on value specifies the time period an LED should stay
11 gets deactivated. There is no provision for one time activation to implement
16 set a timer to hold a state, however when user space application crashes or
36 that are active at the time driver gets suspended, continue to run, without
41 class device property. When brightness is set to 0 from user space via
56 non-transient state. When driver gets suspended, irrespective of the transient
69 transient trigger is activated these properties are set to default values.
71 - duration allows setting timer value in msecs. The initial value is 0.
72 - activate allows activating and deactivating the timer specified by
73 duration as needed. The initial and default value is 0. This will allow
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/Documentation/w1/slaves/
Dw1_therm.rst16 -----------
47 time required by parasited powered device on the line. Reading
49 -1 if at least one sensor still in conversion, 1 if conversion is complete
55 time of issue of the bulk read command (not the current temperature).
59 ``conv_time`` is used to get current conversion time (read), and
60 adjust it (write). A temperature conversion time depends on the device type and
61 its current resolution. Default conversion time is set by the driver according
62 to the device datasheet. A conversion time for many original device clones
63 deviate from datasheet specs. There are three options: 1) manually set the
64 correct conversion time by writing a value in milliseconds to ``conv_time``; 2)
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/Documentation/admin-guide/cgroup-v1/
Ddevices.rst24 An entry is added using devices.allow, and removed using
27 echo 'c 1:3 mr' > /sys/fs/cgroup/1/devices.allow
36 echo a > /sys/fs/cgroup/1/devices.allow
61 access permissions than its parent. Every time an entry is written to
63 from their whitelist and all the locally set whitelist entries will be
64 re-evaluated. In case one of the locally set whitelist entries would provide
74 A allow "b 8:* rwm", "c 116:1 rw"
103 # echo "c *:3 rwm" >A/devices.allow
113 # echo "c 2:3 rwm" >B/devices.allow
114 # echo "c 50:3 r" >B/devices.allow
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/Documentation/networking/devlink/
Dindex.rst5 related to any device class, such as chip-wide/switch-ASIC-wide configuration.
8 -------
10 Driver facing APIs are currently transitioning to allow more explicit
11 locking. Drivers can use the existing ``devlink_*`` set of APIs, or
13 in devlink core, but don't allow registration of most sub-objects once
22 taking RTNL lock at the same time. Devlink instance lock needs to be taken
26 ----------------
32 - Lock ordering should be maintained. If driver needs to take instance
33 lock of both nested and parent instances at the same time, devlink
36 - Driver should use object-specific helpers to setup the
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/Documentation/networking/
Dmptcp-sysctl.rst1 .. SPDX-License-Identifier: GPL-2.0
10 add_addr_timeout - INTEGER (seconds)
11 Set the timeout after which an ADD_ADDR control message will be
15 Do not retransmit if set to 0.
17 The default value matches TCP_RTO_MAX. This is a per-namespace
22 allow_join_initial_addr_port - BOOLEAN
23 Allow peers to send join requests to the IP address and port number used
25 sent to the peer at connection time, and whether such join requests are
31 This is a per-namespace sysctl.
35 available_schedulers - STRING
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/Documentation/trace/
Dhwlat_detector.rst6 -------------
13 originally written for use by the "RT" patch since the Real Time
17 even know that they are occurring. SMIs are instead set up by BIOS code
20 other tasks and those tasks can spend an inordinate amount of time in the
25 amounts of time (with interrupts disabled), polling the CPU Time Stamp Counter
27 time when the polling was interrupted and since the interrupts are disabled,
36 ------
50 - width - time period to sample with CPUs held (usecs)
52 - window - total period of sampling, width being inside (usecs)
54 By default the width is set to 500,000 and window to 1,000,000, meaning that
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/Documentation/devicetree/bindings/rtc/
Dqcom-pm8xxx-rtc.yaml1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/rtc/qcom-pm8xxx-rtc.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Satya Priya <quic_c_skakit@quicinc.com>
15 - enum:
16 - qcom,pm8058-rtc
17 - qcom,pm8921-rtc
18 - qcom,pm8941-rtc
19 - qcom,pmk8350-rtc
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/Documentation/userspace-api/
Dmfd_noexec.rst1 .. SPDX-License-Identifier: GPL-2.0
4 Introduction of non-executable mfd
14 execute bit set, and the memfd_create() syscall doesn't allow setting
17 However, in a secure-by-default system, such as ChromeOS, (where all
31 - Let memfd_create() set X bit at creation time.
32 - Let memfd be sealed for modifying X bit when NX is set.
33 - Add a new pid namespace sysctl: vm.memfd_noexec to help applications in
34 migrating and enforcing non-executable MFD.
41 When MFD_NOEXEC_SEAL bit is set in the ``flags``, memfd is created
42 with NX. F_SEAL_EXEC is set and the memfd can't be modified to
[all …]
Dunshare.rst10 ----------
14 --------
26 -----------
37 outside the confinement of all-or-nothing shared resources of legacy
38 threads. On Linux, at the time of thread creation using the clone system
44 shared at the time of their creation. unshare() was conceptualized by
45 Al Viro in the August of 2000, on the Linux-Kernel mailing list, as part
49 addition to the set of available primitives on Linux that implement
53 -----------
59 even non-threaded applications if they have a need to disassociate
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Dseccomp_filter.rst11 certain subset of userland applications benefit by having a reduced set
12 of available system calls. The resulting set reduces the total kernel
22 history of being exposed to userland and a straightforward data set.
25 to time-of-check-time-of-use (TOCTOU) attacks that are common in system
65 call will return -1 and set errno to ``EINVAL``.
73 true, ``-EACCES`` will be returned. This requirement ensures that filter
79 time, but allow for further decreasing the attack surface during
82 The above call returns 0 on success and non-zero on error.
106 task without executing the system call. ``siginfo->si_call_addr``
108 ``siginfo->si_syscall`` and ``siginfo->si_arch`` will indicate which
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/Documentation/arch/powerpc/
Dcpu_features.rst8 This document describes the system (including self-modifying code) used in the
10 compile-time selection.
13 chooses a set of features accordingly. Some examples include Altivec support,
17 Detection of the feature set is simple. A list of processors can be found in
23 C code may test 'cur_cpu_spec[smp_processor_id()]->cpu_features' for a
28 several paths that are performance-critical and would suffer if an array
30 performance penalty but still allow for runtime (rather than compile-time) CPU
32 based on CPU 0's capabilities, so a multi-processor system with non-identical
52 and END_FTR_SECTION_IFCLR. These simply test if a flag is set (in
53 cur_cpu_spec[0]->cpu_features) or is cleared, respectively. These two macros
/Documentation/rust/
Dcoding-guidelines.rst1 .. SPDX-License-Identifier: GPL-2.0
10 ------------------
13 contributing from time to time to the kernel does not need to learn and
15 do not need to spend time pointing out style issues anymore, and thus
26 when saving or at commit time. However, if for some reason reformatting
37 Like ``clang-format`` for the rest of the kernel, ``rustfmt`` works on
43 --------
51 .. code-block:: rust
60 .. code-block:: rust
67 sometimes it is useful to use both comments and documentation at the same time.
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/Documentation/scsi/
DChangeLog.ips4 5.00.01 - Sarasota ( 5i ) adapters must always be scanned first
5 - Get rid on IOCTL_NEW_COMMAND code
6 - Add Extended DCDB Commands for Tape Support in 5I
8 4.90.11 - Don't actually RESET unless it's physically required
9 - Remove unused compile options
11 4.90.08 - Data Corruption if First Scatter Gather Element is > 64K
13 4.90.08 - Increase Delays in Flashing ( Trombone Only - 4H )
15 4.90.05 - Use New PCI Architecture to facilitate Hot Plug Development
17 4.90.01 - Add ServeRAID Version Checking
19 4.80.26 - Clean up potential code problems ( Arjan's recommendations )
[all …]
/Documentation/driver-api/
Dptp.rst1 .. SPDX-License-Identifier: GPL-2.0
7 This patch set introduces support for IEEE 1588 PTP clocks in
15 complete set of PTP hardware clock functionality.
18 - Set time
19 - Get time
20 - Shift the clock by a given offset atomically
21 - Adjust clock frequency
24 - Time stamp external events
25 - Period output signals configurable from user space
26 - Low Pass Filter (LPF) access from user space
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/Documentation/virt/kvm/devices/
Dvcpu.rst1 .. SPDX-License-Identifier: GPL-2.0
9 kvm_device_attr as other devices, but targets VCPU-wide settings and controls.
19 ---------------------------------------
27 -EBUSY The PMU overflow interrupt is already set
28 -EFAULT Error reading interrupt number
29 -ENXIO PMUv3 not supported or the overflow interrupt not set
31 -ENODEV KVM_ARM_VCPU_PMU_V3 feature missing from VCPU
32 -EINVAL Invalid PMU overflow interrupt number supplied or
33 trying to set the IRQ number without using an in-kernel
43 ---------------------------------------
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/Documentation/arch/x86/
Dpti.rst1 .. SPDX-License-Identifier: GPL-2.0
14 To mitigate this class of attacks, we create an independent set of
27 This approach helps to ensure that side-channel attacks leveraging
30 time. Once enabled at compile-time, it can be disabled at boot with
31 the 'nopti' or 'pti=' kernel parameters (see kernel-parameters.txt).
37 The first set is very similar to the single set which is present in
43 that any missed kernel->user CR3 switch will immediately crash
49 each CPU's copy of the area a compile-time-fixed virtual address.
58 layers of the page tables. This leaves a single, shared set of
59 userspace page tables to manage. One PTE to lock, one set of
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/Documentation/admin-guide/
Dxfs.rst1 .. SPDX-License-Identifier: GPL-2.0
8 on the SGI IRIX platform. It is completely multi-threaded, can
15 for further details. This implementation is on-disk compatible
25 Sets the buffered I/O end-of-file preallocation size when
28 through to 1GiB, inclusive, in power-of-2 increments.
30 The default behaviour is for dynamic end-of-file
31 preallocation size, which uses a set of heuristics to
40 on-disk. When the new form is used for the first time when
42 attributes) the on-disk superblock feature bit field will be
45 The default behaviour is determined by the on-disk feature
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/Documentation/block/
Ddata-integrity.rst10 corruption is done at read time which could potentially be months
40 allow the operating system to interact with the integrity metadata
53 encouraged them to allow separation of the data and integrity metadata
54 scatter-gather lists.
60 Also, the 16-bit CRC checksum mandated by both the SCSI and SATA specs
63 performance for a number of workloads. Some controllers allow a
64 lighter-weight checksum to be used when interfacing with the operating
66 The IP checksum received from the OS is converted to the 16-bit CRC
91 device. However, at the same time this is also the biggest
102 concept of an end-to-end protection scheme is a layering violation.
[all …]
/Documentation/netlabel/
Dlsm_interface.rst12 NetLabel is a mechanism which can set and retrieve security attributes from
26 low-level packet label depending on the NetLabel build time and run time
34 These are the functions which allow the LSM developer to manipulate the labels
44 label and the internal LSM security identifier can be time consuming. The
/Documentation/devicetree/bindings/input/touchscreen/
Dbrcm,iproc-touchscreen.txt4 - compatible: must be "brcm,iproc-touchscreen"
5 - ts_syscon: handler of syscon node defining physical base
9 - clocks: The clock provided by the SOC to driver the tsc
10 - clock-names: name for the clock
11 - interrupts: The touchscreen controller's interrupt
12 - address-cells: Specify the number of u32 entries needed in child nodes.
13 Should set to 1.
14 - size-cells: Specify number of u32 entries needed to specify child nodes size
15 in reg property. Should set to 1.
18 - scanning_period: Time between scans. Each step is 1024 us. Valid 1-256.
[all …]
/Documentation/virt/kvm/
Dhalt-polling.rst1 .. SPDX-License-Identifier: GPL-2.0
9 for some time period after the guest has elected to no longer run by cedeing.
16 the order of a few micro-seconds, although performance benefits are workload
20 wakeup periods where the time spent halt polling is minimised and the time
27 The powerpc kvm-hv specific case is implemented in:
34 The maximum time for which to poll before invoking the scheduler, referred to
39 kvm_vcpu->halt_poll_ns
41 or in the case of powerpc kvm-hv, in the vcore struct:
43 kvmppc_vcore->halt_poll_ns
50 two options, either the polling interval and total block time[0] were less than
[all …]
/Documentation/virt/kvm/x86/
Dtimekeeping.rst1 .. SPDX-License-Identifier: GPL-2.0
4 Timekeeping Virtualization for X86-Based Architectures
23 time introduces a new set of challenges because it introduces a multiplexed
24 division of time beyond the control of the guest CPU.
32 information relevant to KVM and hardware-based virtualization.
41 2.1. i8254 - PIT
42 ----------------
46 channels which can be programmed to deliver periodic or one-shot interrupts.
53 The PIT uses I/O ports 0x40 - 0x43. Access to the 16-bit counters is done
59 -------------- ----------------
[all …]
/Documentation/arch/arm/omap/
Domap_pm.rst8 Over time, the intention is to merge features from the OMAP PM
13 - support the range of power management parameters present in the TI SRF;
15 - separate the drivers from the underlying PM parameter
19 - specify PM parameters in terms of fundamental units, such as
23 - allow drivers which are shared with other architectures (e.g.,
24 DaVinci) to add these constraints in a way which won't affect non-OMAP
27 - can be implemented immediately with minimal disruption of other
34 1. Set the maximum MPU wakeup latency::
36 (*pdata->set_max_mpu_wakeup_lat)(struct device *dev, unsigned long t)
38 2. Set the maximum device wakeup latency::
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/Documentation/userspace-api/media/dvb/
Ddmx-expbuf.rst1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
13 DMX_EXPBUF - Export a buffer as a DMABUF file descriptor.
37 It can be used to export a buffer as a DMABUF file at any time after
41 Applications must set the ``index`` field. Valid index numbers
47 All other fields must be set to zero. In the
48 case of multi-planar API, every plane is exported separately using
51 After calling :ref:`DMX_EXPBUF` the ``fd`` field will be set by a
53 pass it to other DMABUF-aware devices. It is recommended to close a DMABUF
54 file when it is no longer used to allow the associated memory to be reclaimed.
59 .. code-block:: c
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