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/Documentation/infiniband/
Dtag_matching.rst5 The MPI standard defines a set of rules, known as tag-matching, for matching
10 * User tag - wild card may be specified by the receiver
15 message envelopes may match, the pair that includes the earliest posted-send
16 and the earliest posted-receive is the pair that must be used to satisfy the
31 1. The Eager protocol- the complete message is sent when the send is
35 2. The Rendezvous Protocol - the sender sends the tag-matching header,
48 maintained by the hardware, with the software expected to shadow this list.
50 When send is initiated and arrives at the receive side, if there is no
51 pre-posted receive for this arriving message, it is passed to the software and
54 specified receive buffer. This allows overlapping receive-side MPI tag
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/Documentation/process/
Dkernel-enforcement-statement.rst4 ----------------------------------
6 As developers of the Linux kernel, we have a keen interest in how our software
7 is used and how the license for our software is enforced. Compliance with the
8 reciprocal sharing obligations of GPL-2.0 is critical to the long-term
9 sustainability of our software and community.
15 growth of our software ecosystem. In order to deter unhelpful enforcement
20 Notwithstanding the termination provisions of the GPL-2.0, we agree that
22 following provisions of GPL-3.0 as additional permissions under our
23 license with respect to any non-defensive assertion of rights under the
41 software. We want companies and individuals to use, modify and distribute
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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:
21 regulator-max-microvolt:
24 regulator-microvolt-offset:
28 regulator-min-microamp:
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/Documentation/devicetree/bindings/iio/adc/
Dnxp,imx93-adc.yaml1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/iio/adc/nxp,imx93-adc.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Haibo Chen <haibo.chen@nxp.com>
13 The ADC on iMX93 is a 8-channel 12-bit 1MS/s ADC with 4 channels
15 One-Shot and Scan (continuous) conversions. Programmable DMA
18 also has Self-test logic and Software-initiated calibration.
22 const: nxp,imx93-adc
29 - description: WDGnL, watchdog threshold interrupt requests.
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/Documentation/power/
Dswsusp-and-swap-files.rst2 Using swap files with software suspend (swsusp)
13 already taken care of by the swap-handling code, but (2) has to be taken into
52 Documentation/power/userland-swsusp.rst (this is the only method to suspend
53 to a swap file allowing the resume to be initiated from an initrd or initramfs
Dswsusp.rst28 If you have any filesystems on USB devices mounted before software suspend,
47 - If you feel ACPI works pretty well on your system, you might try::
51 - If you would like to write hibernation image to swap and then suspend
56 - If you have SATA disks, you'll need recent kernels with SATA suspend
58 are built into kernel -- not modules. [There's way to make
68 - The resume process checks for the presence of the resume device,
72 - The resume process may be triggered in two ways:
81 read-only) otherwise data may be corrupted.
83 Article about goals and implementation of Software Suspend for Linux
87 Last revised: 2003-10-20 by Pavel Machek
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/Documentation/devicetree/bindings/arm/
Dpsci.yaml1 # SPDX-License-Identifier: GPL-2.0
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
14 ARM DEN 0022A ("Power State Coordination Interface System Software on ARM
15 processors") can be used by Linux to initiate various CPU-centric power
19 and migration of secure software.
25 r0 => 32-bit Function ID / return value
26 {r1 - r3} => Parameters
40 - description:
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/Documentation/PCI/
Dpcieaer-howto.rst1 .. SPDX-License-Identifier: GPL-2.0
8 :Authors: - T. Long Nguyen <tom.l.nguyen@intel.com>
9 - Yanmin Zhang <yanmin.zhang@intel.com>
17 ----------------
26 ----------------------------
29 or on behalf of transactions initiated on the link. PCIe
41 - Gathers the comprehensive error information if errors occurred.
42 - Reports error to the users.
43 - Performs error recovery actions.
53 ------------------------------------------------------
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/Documentation/leds/
Dleds-class.rst8 of the LED (taking a value 0-max_brightness). Most LEDs don't have hardware
9 brightness support so will just be turned on for non-zero brightness settings.
14 existing subsystems with minimal additional code. Examples are the disk-activity,
15 nand-disk and sharpsl-charge triggers. With led triggers disabled, the code
48 - devicename:
57 - color:
59 include/dt-bindings/leds/common.h.
61 - function:
63 include/dt-bindings/leds/common.h.
66 to linux-leds@vger.kernel.org.
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/Documentation/virt/kvm/x86/
Dtimekeeping.rst1 .. SPDX-License-Identifier: GPL-2.0
4 Timekeeping Virtualization for X86-Based Architectures
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 -------------- ----------------
61 | 1.1932 MHz|---------->| CLOCK OUT | ---------> IRQ 0
63 -------------- | +->| GATE TIMER 0 |
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/Documentation/networking/
Dplip.rst1 .. SPDX-License-Identifier: GPL-2.0
14 -----------------
17 This device interface allows a point-to-point connection between two
25 printer port. PLIP is a non-standard, but [can use] uses the standard
26 LapLink null-printer cable [can also work in turbo mode, with a PLIP
28 initiated by Crynwr.]
44 cables, everything else is software configuration [which in principle
62 -------------------
77 On these machines, the PLIP driver can be used in IRQ-less mode, where
82 indicate that there isn't a noticeable performance drop when using IRQ-less
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Doa-tc6-framework.rst1 .. SPDX-License-Identifier: GPL-2.0+
4 OPEN Alliance 10BASE-T1x MAC-PHY Serial Interface (TC6) Framework Support
8 ------------
11 single pair of conductors. The 10BASE-T1L (Clause 146) is a long reach
12 PHY supporting full duplex point-to-point operation over 1 km of single
13 balanced pair of conductors. The 10BASE-T1S (Clause 147) is a short reach
14 PHY supporting full / half duplex point-to-point operation over 15 m of
21 works in conjunction with the 10BASE-T1S PHY operating in multidrop mode.
23 The aforementioned PHYs are intended to cover the low-speed / low-cost
29 The MAC-PHY solution integrates an IEEE Clause 4 MAC and a 10BASE-T1x PHY
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/Documentation/driver-api/
Dlibata.rst12 transports for ATA and ATAPI devices, and SCSI<->ATA translation for ATA
16 internals, and a couple sample ATA low-level drivers.
22 is defined for every low-level libata
23 hardware driver, and it controls how the low-level driver interfaces
26 FIS-based drivers will hook into the system with ``->qc_prep()`` and
27 ``->qc_issue()`` high-level hooks. Hardware which behaves in a manner
33 ----------------------------------------------------------
35 Post-IDENTIFY device configuration
44 Typically used to apply device-specific fixups prior to issue of SET
45 FEATURES - XFER MODE, and prior to operation.
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/Documentation/driver-api/usb/
Dgadget.rst11 This document presents a Linux-USB "Gadget" kernel mode API, for use
17 - Supports USB 2.0, for high speed devices which can stream data at
20 - Handles devices with dozens of endpoints just as well as ones with
21 just two fixed-function ones. Gadget drivers can be written so
24 - Flexible enough to expose more complex USB device capabilities such
28 - USB "On-The-Go" (OTG) support, in conjunction with updates to the
29 Linux-USB host side.
31 - Sharing data structures and API models with the Linux-USB host side
32 API. This helps the OTG support, and looks forward to more-symmetric
36 - Minimalist, so it's easier to support new device controller hardware.
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Dusb.rst1 .. _usb-hostside-api:
4 The Linux-USB Host Side API
18 That master/slave asymmetry was designed-in for a number of reasons, one
21 peripheral). Also, the host software doesn't need to deal with
22 distributed auto-configuration since the pre-designated master node
37 USB Host-Side API Model
40 Host-side drivers for USB devices talk to the "usbcore" APIs. There are
41 two. One is intended for *general-purpose* drivers (exposed through
49 - USB supports four kinds of data transfers (control, bulk, interrupt,
54 - The device description model includes one or more "configurations"
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/Documentation/networking/device_drivers/ethernet/mellanox/mlx5/
Dcounters.rst1 .. SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
13 - `Overview`_
14 - `Groups`_
15 - `Types`_
16 - `Descriptions`_
27 ----------------------------------------
29 ---------------------------------------- ---------------------------------------- |
32 | ------------------- --------------- | | ------------------- --------------- | |
34 | ------------------- --------------- | | ------------------- --------------- | |
36 | ------------------- | | ------------------- | |
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/Documentation/devicetree/bindings/thermal/
Dthermal-zones.yaml1 # SPDX-License-Identifier: (GPL-2.0)
4 ---
5 $id: http://devicetree.org/schemas/thermal/thermal-zones.yaml#
6 $schema: http://devicetree.org/meta-schemas/base.yaml#
11 - Daniel Lezcano <daniel.lezcano@linaro.org>
15 and the software abstraction of cooling devices and thermal zones required to
20 - thermal-sensor: device that measures temperature, has SoC-specific bindings
21 - cooling-device: device used to dissipate heat either passively or actively
22 - thermal-zones: a container of the following node types used to describe all
25 This binding describes the thermal-zones.
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/Documentation/arch/powerpc/
Dtransactional_memory.rst49 transactional or non-transactional accesses within the system. In this
50 example, the transaction completes as though it were normal straight-line code
69 - Conflicts with cache lines used by other processors
70 - Signals
71 - Context switches
72 - See the ISA for full documentation of everything that will abort transactions.
109 determine the transactional state -- if so, the second ucontext in uc->uc_link
112 For 64-bit processes, uc->uc_mcontext.regs->msr is a full 64-bit MSR and its TS
115 For 32-bit processes, the mcontext's MSR register is only 32 bits; the top 32
117 uc->uc_link->uc_mcontext.regs->msr. The top word contains the transactional
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Dcxlflash.rst12 purpose co-processors which can read or write an application's
40 - Any flash device (LUN) can be configured to be accessed as a
43 - Any flash device (LUN) can be configured to be accessed from
47 or physical LUN access) or access to a kernel/AFU-mediated
67 +-------------------------------+
71 +-------------------------------+
75 +-------------------------------+
78 +-------------------------------+
80 This driver configures itself into the SCSI software stack as an
99 the sizes of all the virtual LUNs, along with the meta-data associated
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Dultravisor.rst1 .. SPDX-License-Identifier: GPL-2.0
16 (PVR=0x004e1203) or greater will be PEF-capable. A new ISA release
25 +------------------+
29 +------------------+
31 +------------------+
33 +------------------+
35 +------------------+
75 +---+---+---+---------------+
79 +---+---+---+---------------+
81 +---+---+---+---------------+
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Dkvm-nested.rst1 .. SPDX-License-Identifier: GPL-2.0
13 refer to different software entities. L0 is the hypervisor mode entity
15 guest virtual machine that is directly run under L0 and is initiated
16 and controlled by L0. L2 is a guest virtual machine that is initiated
44 vCPU (except in the short sequence in the L0 on L1 -> L2 entry and L2
45 -> L1 exit).
74 - L1 and L0 negotiate capabilities with H_GUEST_{G,S}ET_CAPABILITIES()
77 - L1 requests the L0 create an L2 with H_GUEST_CREATE() and receives a token
79 - L1 requests the L0 create an L2 vCPU with H_GUEST_CREATE_VCPU()
81 - L1 and L0 communicate the vCPU state using the H_GUEST_{G,S}ET() hcall
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/Documentation/userspace-api/media/v4l/
Ddev-decoder.rst1 .. SPDX-License-Identifier: GPL-2.0
6 Memory-to-Memory Stateful Video Decoder Interface
9 A stateful video decoder takes complete chunks of the bytestream (e.g. Annex-B
14 Performing software parsing, processing etc. of the stream in the driver in
34 5. Single-planar API (see :ref:`planar-apis`) and applicable structures may be
35 used interchangeably with multi-planar API, unless specified otherwise,
44 .. _decoder-glossary:
79 Good at sub-partitioning the picture into variable sized structures.
103 Instantaneous Decoder Refresh; a type of a keyframe in an H.264/HEVC-encoded
112 block transforms (e.g. H.264, VP8, VP9); codec-specific, but for most of
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Ddev-encoder.rst1 .. SPDX-License-Identifier: GPL-2.0 OR GFDL-1.1-no-invariants-or-later
6 Memory-to-Memory Stateful Video Encoder Interface
12 further post-processing by the client.
14 Performing software stream processing, header generation etc. in the driver
34 5. Single-planar API (see :ref:`planar-apis`) and applicable structures may be
35 used interchangeably with multi-planar API, unless specified otherwise,
47 Refer to :ref:`decoder-glossary`.
52 .. kernel-render:: DOT
65 qi -> Initialization [ label = "open()" ];
67 Initialization -> Encoding [ label = "Both queues streaming" ];
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/Documentation/admin-guide/
Dquickly-build-trimmed-linux.rst1 .. SPDX-License-Identifier: (GPL-2.0+ OR CC-BY-4.0)
9 testing purposes, but perfectly fine for day-to-day use, too.
15 section below: it contains a step-by-step guide, which is more detailed, but
21 self-compiled Linux kernels; install compilers and everything else needed for
26 git clone --depth 1 -b master \
34 make -j $(nproc --all)
37 command -v installkernel && sudo make modules_install install
43 git fetch --depth 1 origin
45 git checkout --force --detach origin/master
49 make -j $(nproc --all)
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Dverify-bugs-and-bisect-regressions.rst1 .. SPDX-License-Identifier: (GPL-2.0+ OR CC-BY-4.0)
9 currently supported by developers -- to then explain how to locate the change
22 read and navigate this document -- especially when you want to look something
26 https://docs.kernel.org/admin-guide/verify-bugs-and-bisect-regressions.html
32 over to the* ':ref:`step-by-step guide <introguide_bissbs>`' *below. It utilizes
45 *segment 2*. Then you can submit a preliminary report -- or continue with
47 full-fledged regression report. In the following example 6.0.13 is assumed to be
53 # * Remove any software that depends on externally maintained kernel modules
55 # * Ensure Secure Boot permits booting self-compiled Linux kernels.
59 git clone -o mainline --no-checkout \
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