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/Documentation/devicetree/bindings/usb/
Dbrcm,usb-pinmap.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/usb/brcm,usb-pinmap.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Al Cooper <alcooperx@gmail.com>
15 - const: brcm,usb-pinmap
22 description: Interrupt for signals mirrored to out-gpios.
24 in-gpios:
29 brcm,in-functions:
30 $ref: /schemas/types.yaml#/definitions/string-array
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/Documentation/devicetree/bindings/sound/
Damlogic,axg-sound-card.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/sound/amlogic,axg-sound-card.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Jerome Brunet <jbrunet@baylibre.com>
13 - $ref: sound-card-common.yaml#
17 const: amlogic,axg-sound-card
19 audio-aux-devs:
20 $ref: /schemas/types.yaml#/definitions/phandle-array
23 audio-widgets:
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/Documentation/arch/arm64/
Dpointer-authentication.rst7 Date: 2017-07-19
14 ---------------------
27 of high-order bits of the pointer, which varies dependent on the
36 The extension provides five separate keys to generate PACs - two for
42 -------------
69 ---------
76 The regset is exposed only when HWCAP_PACA is set. Separate masks are
78 bits can vary between the two. Note that the masks apply to TTBR0
89 --------------
105 filter out the Pointer Authentication system key registers from
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/Documentation/core-api/
Dgfp_mask-from-fs-io.rst4 GFP masks used from FS/IO context
16 already held resources (e.g. locks - most commonly those used for the
22 used as shortcut. It turned out though that above approach has led to
25 of GFP_NOFS/GFP_NOIO can lead to memory over-reclaim or other memory
38 .. kernel-doc:: include/linux/sched/mm.h
40 .. kernel-doc:: include/linux/sched/mm.h
44 any critical section with respect to the reclaim is started - e.g.
59 GFP_KERNEL allocations deep inside the allocator which are quite non-trivial
Dpadata.rst1 .. SPDX-License-Identifier: GPL-2.0
9 Padata is a mechanism by which the kernel can farm jobs out to be done in
23 ------------
43 ------------------
58 live in /sys/kernel/pcrypt/<instance-name>. Within an instance's directory
64 Reading one of these files shows the user-supplied cpumask, which may be
67 Padata maintains two pairs of cpumasks internally, the user-supplied cpumasks
69 cpumask.) The user-supplied cpumasks default to all possible CPUs on instance
71 subset of the user-supplied cpumasks and contain only the online CPUs in the
72 user-supplied masks; these are the cpumasks padata actually uses. So it is
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/Documentation/devicetree/bindings/mfd/
Das3722.txt4 -------------------
5 - compatible: Must be "ams,as3722".
6 - reg: I2C device address.
7 - interrupt-controller: AS3722 has internal interrupt controller which takes the
8 interrupt request from internal sub-blocks like RTC, regulators, GPIOs as well
10 - #interrupt-cells: Should be set to 2 for IRQ number and flags.
12 of AS3722 are defined at dt-bindings/mfd/as3722.h
13 The second cell is the flags, encoded as the trigger masks from binding document
14 interrupts.txt, using dt-bindings/irq.
17 --------------------
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Dwlf,arizona.yaml1 # SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - patches@opensource.cirrus.com
17 - $ref: /schemas/spi/spi-peripheral-props.yaml
18 - $ref: /schemas/sound/wlf,arizona.yaml#
19 - $ref: /schemas/regulator/wlf,arizona.yaml#
20 - $ref: /schemas/extcon/wlf,arizona.yaml#
21 - if:
26 - cirrus,cs47l24
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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
63 on the SPU. The bit masks for the status codes are:
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/Documentation/arch/s390/
Dvfio-ap.rst13 The AP adapter cards are exposed via the AP bus. The motivation for vfio-ap
45 sub-directory::
76 significant bit, correspond to domains 0-255.
111 * NQAP: to enqueue an AP command-request message to a queue
112 * DQAP: to dequeue an AP command-reply message from a queue
132 an APID from 0-255. If a bit is set, the corresponding adapter is valid for
137 corresponds to an AP queue index (APQI) from 0-255. If a bit is set, the
142 changed by an AP command-request message sent to a usage domain from the
144 0-255. If a bit is set, the corresponding domain can be modified by an AP
145 command-request message sent to a usage domain.
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/Documentation/RCU/Design/Expedited-Grace-Periods/
DExpedited-Grace-Periods.rst13 There are two flavors of RCU (RCU-preempt and RCU-sched), with an earlier
14 third RCU-bh flavor having been implemented in terms of the other two.
38 RCU-preempt Expedited Grace Periods
41 ``CONFIG_PREEMPTION=y`` kernels implement RCU-preempt.
42 The overall flow of the handling of a given CPU by an RCU-preempt
45 .. kernel-figure:: ExpRCUFlow.svg
59 can check to see if the CPU is currently running in an RCU read-side
63 invocation will provide the needed quiescent-state report.
64 This flag-setting avoids the previous forced preemption of all
65 CPUs that might have RCU read-side critical sections.
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/Documentation/driver-api/rapidio/
Dtsi721.rst2 RapidIO subsystem mport driver for IDT Tsi721 PCI Express-to-SRIO bridge.
10 doorbells, inbound maintenance port-writes and RapidIO messaging.
23 - 'dbg_level'
24 - This parameter allows to control amount of debug information
26 This parameter can be changed bit masks that correspond to the specific
32 - 'dma_desc_per_channel'
33 - This parameter defines number of hardware buffer
37 - 'dma_txqueue_sz'
38 - DMA transactions queue size. Defines number of pending
42 - 'dma_sel'
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/Documentation/admin-guide/mm/
Dpagemap.rst11 * ``/proc/pid/pagemap``. This file lets a userspace process find out which
12 physical frame each virtual page is mapped to. It contains one 64-bit
16 * Bits 0-54 page frame number (PFN) if present
17 * Bits 0-4 swap type if swapped
18 * Bits 5-54 swap offset if swapped
19 * Bit 55 pte is soft-dirty (see
20 Documentation/admin-guide/mm/soft-dirty.rst)
22 * Bit 57 pte is uffd-wp write-protected (since 5.13) (see
23 Documentation/admin-guide/mm/userfaultfd.rst)
25 * Bits 59-60 zero
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/Documentation/ABI/stable/
Dsysfs-driver-ib_srp1 What: /sys/class/infiniband_srp/srp-<hca>-<port_number>/add_target
4 Contact: linux-rdma@vger.kernel.org
7 a comma-separated list of login parameters to this sysfs
10 * id_ext, a 16-digit hexadecimal number specifying the eight
11 byte identifier extension in the 16-byte SRP target port
14 * ioc_guid, a 16-digit hexadecimal number specifying the eight
15 byte I/O controller GUID portion of the 16-byte target port
17 * dgid, a 32-digit hexadecimal number specifying the
19 * pkey, a four-digit hexadecimal number specifying the
21 * service_id, a 16-digit hexadecimal number specifying the
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/Documentation/userspace-api/media/drivers/
Domap3isp-uapi.rst1 .. SPDX-License-Identifier: GPL-2.0
17 ------
37 - V4L2_EVENT_OMAP3ISP_AEWB
38 - V4L2_EVENT_OMAP3ISP_AF
39 - V4L2_EVENT_OMAP3ISP_HIST
44 omap3isp_stat_event_status.buf_err is set to non-zero.
48 --------------
52 does not fall under the standard IOCTLs --- gamma tables and configuration of
56 containing hardware-dependent functions.
60 - VIDIOC_OMAP3ISP_CCDC_CFG
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/Documentation/arch/x86/
Dresctrl.rst1 .. SPDX-License-Identifier: GPL-2.0
9 :Authors: - Fenghua Yu <fenghua.yu@intel.com>
10 - Tony Luck <tony.luck@intel.com>
11 - Vikas Shivappa <vikas.shivappa@intel.com>
38 # mount -t resctrl resctrl [-o cdp[,cdpl2][,mba_MBps][,debug]] /sys/fs/resctrl
57 pseudo-locking is a unique way of using cache control to "pin" or
59 "Cache Pseudo-Locking".
96 own settings for cache use which can over-ride
128 Corresponding region is pseudo-locked. No
131 Indicates if non-contiguous 1s value in CBM is supported.
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/Documentation/driver-api/usb/
Dwriting_musb_glue_layer.rst15 Instead, these embedded UDC rely on the USB On-the-Go (OTG)
18 Dual-Role Controller (MUSB HDRC) found in the Mentor Graphics Inventra™
21 As a self-taught exercise I have written an MUSB glue layer for the
28 .. _musb-basics:
33 To get started on the topic, please read USB On-the-Go Basics (see
46 ------------------------
47 | | <------- drivers/usb/gadget
48 | Linux USB Core Stack | <------- drivers/usb/host
49 | | <------- drivers/usb/core
50 ------------------------
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/Documentation/userspace-api/media/v4l/
Ddev-sliced-vbi.rst1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
17 :ref:`raw VBI interface <raw-vbi>`. The data is passed as short
51 .. _sliced-vbi-format-negotitation:
56 To find out which data services are supported by the hardware
103 -----------------------------
115 .. flat-table::
116 :header-rows: 0
117 :stub-columns: 0
120 * - __u16
121 - ``service_set``
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Dbuffer.rst1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
11 the Streaming I/O methods. In the multi-planar API, the data is held in
14 copied. These pointers, together with meta-information like timestamps
18 :ref:`VIDIOC_DQBUF <VIDIOC_QBUF>` ioctl. In the multi-planar API,
19 some plane-specific members of struct :c:type:`v4l2_buffer`,
26 see flags in the masks ``V4L2_BUF_FLAG_TIMESTAMP_MASK`` and
27 ``V4L2_BUF_FLAG_TSTAMP_SRC_MASK`` in :ref:`buffer-flags`. These flags
33 mem-to-mem devices is an exception to the rule: the timestamp source
41 laid out in the buffer. Those parameters are exposed through both formats and
164 .. flat-table:: struct v4l2_buffer
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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/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/scsi/
DChangeLog.lpfc2 * Please read the associated RELEASE-NOTES file !!!
8 * Fixed build warning for 2.6.12-rc2 kernels: mempool_alloc now
12 for fabric and nport logins out of lpfc_cmpl_els_flogi.
19 * Removed FC_TRANSPORT_PATCHESxxx defines. They're in 2.6.12-rc1.
26 * Added PCI ID for LP10000-S.
29 if we timed out waiting for command to complete after abort was
31 * Zero-out response sense length in lpfc_scsi_prep_cmnd to prevent
33 - was causing spurious 0710 messages.
55 - stop using volatile. if you need special ordering use memory
57 - switch lpfc_sli_pcimem_bcopy to take void * arguments.
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/Documentation/driver-api/
Dvfio.rst2 VFIO - "Virtual Function I/O" [1]_
7 allotted. This includes x86 hardware with AMD-Vi and Intel VT-d,
12 safe [2]_, non-privileged, userspace drivers.
19 bare-metal device drivers [3]_.
22 field, also benefit from low-overhead, direct device access from
23 userspace. Examples include network adapters (often non-TCP/IP based)
26 driver, be maintained out of tree, or make use of the UIO framework,
36 ---------------------------
42 as allowing a device read-write access to system memory imposes the
55 For instance, an individual device may be part of a larger multi-
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/Documentation/virt/kvm/
Dapi.rst1 .. SPDX-License-Identifier: GPL-2.0
4 The Definitive KVM (Kernel-based Virtual Machine) API Documentation
13 - System ioctls: These query and set global attributes which affect the
17 - VM ioctls: These query and set attributes that affect an entire virtual
24 - vcpu ioctls: These query and set attributes that control the operation
32 - device ioctls: These query and set attributes that control the operation
80 facility that allows backward-compatible extensions to the API to be
104 the ioctl returns -ENOTTY.
122 -----------------------
139 -----------------
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/Documentation/filesystems/
Dproc.rst1 .. SPDX-License-Identifier: GPL-2.0
24 1.1 Process-Specific Subdirectories
36 3 Per-Process Parameters
37 3.1 /proc/<pid>/oom_adj & /proc/<pid>/oom_score_adj - Adjust the oom-killer
39 3.2 /proc/<pid>/oom_score - Display current oom-killer score
40 3.3 /proc/<pid>/io - Display the IO accounting fields
41 3.4 /proc/<pid>/coredump_filter - Core dump filtering settings
42 3.5 /proc/<pid>/mountinfo - Information about mounts
44 3.7 /proc/<pid>/task/<tid>/children - Information about task children
45 3.8 /proc/<pid>/fdinfo/<fd> - Information about opened file
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/Documentation/networking/
Dtcp_ao.rst1 .. SPDX-License-Identifier: GPL-2.0
7 TCP Authentication Option (TCP-AO) provides a TCP extension aimed at verifying
11 The intent of TCP-AO is to deprecate TCP-MD5 providing better security,
17 .. table:: Short and Limited Comparison of TCP-AO and TCP-MD5
19 +----------------------+------------------------+-----------------------+
20 | | TCP-MD5 | TCP-AO |
22 |Supported hashing |MD5 |Must support HMAC-SHA1 |
23 |algorithms |(cryptographically weak)|(chosen-prefix attacks)|
24 | | |and CMAC-AES-128 (only |
25 | | |side-channel attacks). |
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