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/Documentation/admin-guide/perf/
Dimx-ddr.rst23 .. code-block:: bash
25 perf stat -a -e imx8_ddr0/cycles/ cmd
26 perf stat -a -e imx8_ddr0/read/,imx8_ddr0/write/ cmd
28 AXI filtering is only used by CSV modes 0x41 (axid-read) and 0x42 (axid-write)
33 un-supported, and value 1 for supported.
37 --AXI_ID defines AxID matching value.
38 --AXI_MASKING defines which bits of AxID are meaningful for the matching.
40 - 0: corresponding bit is masked.
41 - 1: corresponding bit is not masked, i.e. used to do the matching.
44 When non-masked bits are matching corresponding AXI_ID bits then counter is
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/Documentation/devicetree/bindings/arm/tegra/
Dnvidia,tegra194-cbb.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/arm/tegra/nvidia,tegra194-cbb.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Sumit Gupta <sumitg@nvidia.com>
15 multiple hierarchical sub-NOCs (Network-on-Chip) and connects various
20 "AON-NOC, SCE-NOC, RCE-NOC, BPMP-NOC, CV-NOC" and "CBB Central NOC"
26 SError or Data Abort is masked and the error is reported with interrupt.
28 - For CCPLEX (CPU Complex) initiator, the driver sets ERD bit. So, the
31 - For other initiators, the ERD is disabled. So, the access issuing
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/Documentation/filesystems/
Dadfs.rst1 .. SPDX-License-Identifier: GPL-2.0
4 Acorn Disc Filing System - ADFS
8 -----------------------------
12 - new maps
13 - new directories or big directories
17 - E and E+, with or without boot block
18 - F and F+
32 ----------------------
49 ------------------------------------------------
53 - Owner read
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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.
18 arch/powerpc/kernel/cputable.c. The PVR register is masked and compared with
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
53 cur_cpu_spec[0]->cpu_features) or is cleared, respectively. These two macros
Ddexcr.rst1 .. SPDX-License-Identifier: GPL-2.0-or-later
11 PowerPC ISA 3.1B (Power10) that allows per-cpu control over several dynamic
13 branch target prediction) and enabling return-oriented programming (ROP)
24 A hypervisor-privileged SPR that can control aspects for the hypervisor and
27 An optional ultravisor-privileged SPR that can control aspects for the ultravisor.
30 provides a non-privileged read-only view of the userspace DEXCR aspects.
31 There is also an SPR that provides a read-only view of the hypervisor enforced
40 -----
52 .. flat-table::
53 :header-rows: 1
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/Documentation/filesystems/spufs/
Dspu_run.rst1 .. SPDX-License-Identifier: GPL-2.0
10 spu_run - execute an spu context
25 Cell Broadband Engine Architecture in order to access Synergistic Pro-
26 cessor Units (SPUs). It uses the fd that was returned from spu_cre-
27 ate(2) to address a specific SPU context. When the context gets sched-
32 not return while the SPU is still running. If there is a need to exe-
42 gets filled when spu_run returns. It can be one of the following con-
59 spu_run returns the value of the spu_status register or -1 to indicate
62 optionally a 14 bit code returned from the stop-and-signal instruction
66 SPU was stopped by stop-and-signal.
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/Documentation/hwmon/
Dadm1026.rst16 - Philip Pokorny <ppokorny@penguincomputing.com> for Penguin Computing
17 - Justin Thiessen <jthiessen@penguincomputing.com>
20 -----------------
23 List of GPIO pins (0-16) to program as inputs
26 List of GPIO pins (0-16) to program as outputs
29 List of GPIO pins (0-16) to program as inverted
32 List of GPIO pins (0-16) to program as normal/non-inverted
35 List of GPIO pins (0-7) to program as fan tachs
39 -----------
45 16 general purpose digital I/O lines, eight (8) fan speed sensors (8-bit),
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/Documentation/virt/kvm/devices/
Ds390_flic.rst1 .. SPDX-License-Identifier: GPL-2.0
7 FLIC handles floating (non per-cpu) interrupts, i.e. I/O, service and some
8 machine check interruptions. All interrupts are stored in a per-vm list of
14 - add interrupts (KVM_DEV_FLIC_ENQUEUE)
15 - inspect currently pending interrupts (KVM_FLIC_GET_ALL_IRQS)
16 - purge all pending floating interrupts (KVM_DEV_FLIC_CLEAR_IRQS)
17 - purge one pending floating I/O interrupt (KVM_DEV_FLIC_CLEAR_IO_IRQ)
18 - enable/disable for the guest transparent async page faults
19 - register and modify adapter interrupt sources (KVM_DEV_FLIC_ADAPTER_*)
20 - modify AIS (adapter-interruption-suppression) mode state (KVM_DEV_FLIC_AISM)
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/Documentation/trace/coresight/
Dcoresight-etm4x-reference.rst11 ---------------------------
20 ----
37 ----
47 ----
52 - > 0 : Programs up the hardware with the current values held in the driver
55 - = 0 : disable trace hardware.
60 ----
72 ----
77 When FEAT_TRF is implemented, value of TRFCR_ELx.TS used for trace session. Otherwise -1
86 ----
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/Documentation/devicetree/bindings/powerpc/fsl/
Dmpic.txt14 - compatible
22 - reg
24 Value type: <prop-encoded-array>
29 - interrupt-controller
35 - #interrupt-cells
39 specifiers do not contain the interrupt-type or type-specific
42 - #address-cells
47 - pic-no-reset
53 configuration registers to a sane state-- masked or
60 - big-endian
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/Documentation/admin-guide/thermal/
Dintel_powerclamp.rst6 - Arjan van de Ven <arjan@linux.intel.com>
7 - Jacob Pan <jacob.jun.pan@linux.intel.com>
12 - Goals and Objectives
15 - Idle Injection
16 - Calibration
19 - Effectiveness and Limitations
20 - Power vs Performance
21 - Scalability
22 - Calibration
23 - Comparison with Alternative Techniques
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/Documentation/arch/arm64/
Dbooting.rst13 (EL0 - EL3), with EL0, EL1 and EL2 having a secure and a non-secure
33 ---------------------------
46 -------------------------
50 The device tree blob (dtb) must be placed on an 8-byte boundary and must
59 ------------------------------
71 ------------------------
75 The decompressed kernel image contains a 64-byte header as follows::
91 - As of v3.17, all fields are little endian unless stated otherwise.
93 - code0/code1 are responsible for branching to stext.
95 - when booting through EFI, code0/code1 are initially skipped.
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Dcpu-feature-registers.rst13 -------------
30 c) HWCAPs cannot represent non-boolean information effectively. The
37 ---------------
56 fields are masked out(i.e, made invisible) and their values are set to
66 IMPLEMENTATION DEFINED as per ARMv8-A Architecture.
81 \- midr
82 \- revidr
85 --------------------
97 (See Table C5-6 'System instruction encodings for non-Debug System
113 -------------------------------------------
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/Documentation/scsi/
Dst.rst1 .. SPDX-License-Identifier: GPL-2.0
23 flexible method and applicable to single-user workstations. However,
32 drive performs auto-detection of the tape format well (like some
33 QIC-drives). The result is that any tape can be read, writing can be
37 does not perform auto-detection well enough and there is a single
40 or not :-).
57 between formats in multi-tape operations (the explicitly overridden
72 limits). Both the auto-rewind (minor equals device number) and
73 non-rewind devices (minor is 128 + device number) are implemented.
128 dev_upper non-rew mode dev-lower
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/Documentation/netlink/specs/
Dovs_flow.yaml1 # SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause)
5 protocol: genetlink-legacy
6 uapi-header: linux/openvswitch.h
12 -
13 name: ovs-header
18 -
19 name: dp-ifindex
24 -
25 name: ovs-flow-stats
28 -
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/Documentation/virt/kvm/
Dvcpu-requests.rst1 .. SPDX-License-Identifier: GPL-2.0
46 ----------
64 ---------
66 VCPUs have a mode state, ``vcpu->mode``, that is used to track whether the
68 outside guest mode states. The architecture may use ``vcpu->mode`` to
96 VCPU requests are simply bit indices of the ``vcpu->requests`` bitmap.
97 This means general bitops, like those documented in [atomic-ops]_ could
100 clear_bit(KVM_REQ_UNBLOCK & KVM_REQUEST_MASK, &vcpu->requests);
108 ---------------------------------
137 guarantee the to-be-kicked vCPU has fully exited guest mode.
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/Documentation/driver-api/usb/
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
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"
60 - From USB 3.0 on configurations have one or more "functions", which
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/Documentation/cdrom/
Dcdrom-standard.rst2 A Linux CD-ROM standard
14 Linux is probably the Unix-like operating system that supports
18 - The large list of hardware devices available for the many platforms
19 that Linux now supports (i.e., i386-PCs, Sparc Suns, etc.)
20 - The open design of the operating system, such that anybody can write a
22 - There is plenty of source code around as examples of how to write a driver.
29 This divergence of behavior has been very significant for CD-ROM
32 their drivers totally inconsistent, the writers of Linux CD-ROM
35 maintain uniform behavior across all the Linux CD-ROM drivers.
38 all the different CD-ROM device drivers for Linux. This document also
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/Documentation/admin-guide/laptops/
Dthinkpad-acpi.rst9 - Borislav Deianov <borislav@users.sf.net>
10 - Henrique de Moraes Holschuh <hmh@hmh.eng.br>
12 http://ibm-acpi.sf.net/
19 This driver used to be named ibm-acpi until kernel 2.6.21 and release
20 0.13-20070314. It used to be in the drivers/acpi tree, but it was
21 moved to the drivers/misc tree and renamed to thinkpad-acpi for kernel
25 The driver is named "thinkpad-acpi". In some places, like module
29 "tpacpi" is used as a shorthand where "thinkpad-acpi" would be too
33 ------
38 - Fn key combinations
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/Documentation/PCI/
Dpci.rst1 .. SPDX-License-Identifier: GPL-2.0
7 :Authors: - Martin Mares <mj@ucw.cz>
8 - Grant Grundler <grundler@parisc-linux.org>
11 Since each CPU architecture implements different chip-sets and PCI devices
18 by Jonathan Corbet, Alessandro Rubini, and Greg Kroah-Hartman.
26 "Linux PCI" <linux-pci@atrey.karlin.mff.cuni.cz> mailing list.
38 supporting hot-pluggable PCI, CardBus, and Express-Card in a single driver].
45 - Enable the device
46 - Request MMIO/IOP resources
47 - Set the DMA mask size (for both coherent and streaming DMA)
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/Documentation/userspace-api/ioctl/
Dhdio.rst5 - Edward A. Falk <efalk@google.com>
10 the HD/IDE layer. These are by-and-large implemented (as of Linux 5.11)
11 drivers/ata/libata-scsi.c.
27 ioctls that pass non-pointer values:
37 ------------------------------------------------------------------------------
42 and -1 with errno set to an appropriate value on error.
44 Unless otherwise specified, all ioctl calls return -1 and set
51 ------------------------------------------------------------------------------
82 - EINVAL
94 are the "bios" values -- presumably the values the drive had
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/Documentation/networking/
Dscaling.rst1 .. SPDX-License-Identifier: GPL-2.0
13 multi-processor systems.
17 - RSS: Receive Side Scaling
18 - RPS: Receive Packet Steering
19 - RFS: Receive Flow Steering
20 - Accelerated Receive Flow Steering
21 - XPS: Transmit Packet Steering
28 (multi-queue). On reception, a NIC can send different packets to different
33 generally known as “Receive-side Scaling” (RSS). The goal of RSS and
35 Multi-queue distribution can also be used for traffic prioritization, but
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Daf_xdp.rst1 .. SPDX-License-Identifier: GPL-2.0
20 XDP programs to redirect frames to a memory buffer in a user-space
64 single-consumer / single-producer (for performance reasons), the new
72 user-space application can place an XSK at an arbitrary place in this
99 http://vger.kernel.org/lpc_net2018_talks/lpc18_paper_af_xdp_perf-v2.pdf. Do
106 ----
109 equal-sized frames. An UMEM is associated to a netdev and a specific
121 The UMEM has two single-producer/single-consumer rings that are used
123 user-space application.
126 -----
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/Documentation/RCU/Design/Data-Structures/
DData-Structures.rst15 Data-Structure Relationships
25 .. kernel-figure:: BigTreeClassicRCU.svg
34 which results in a three-level ``rcu_node`` tree.
38 The purpose of this combining tree is to allow per-CPU events
39 such as quiescent states, dyntick-idle transitions,
42 Quiescent states are recorded by the per-CPU ``rcu_data`` structures,
43 and other events are recorded by the leaf-level ``rcu_node``
54 As can be seen from the diagram, on a 64-bit system
55 a two-level tree with 64 leaves can accommodate 1,024 CPUs, with a fanout
58 +-----------------------------------------------------------------------+
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/Documentation/admin-guide/
Dkernel-parameters.txt16 force -- enable ACPI if default was off
17 on -- enable ACPI but allow fallback to DT [arm64,riscv64]
18 off -- disable ACPI if default was on
19 noirq -- do not use ACPI for IRQ routing
20 strict -- Be less tolerant of platforms that are not
22 rsdt -- prefer RSDT over (default) XSDT
23 copy_dsdt -- copy DSDT to memory
24 nospcr -- disable console in ACPI SPCR table as
41 If set to vendor, prefer vendor-specific driver
73 Documentation/firmware-guide/acpi/debug.rst for more information about
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