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/Documentation/ABI/testing/
Dsysfs-class-bdi14 non-block filesystems which provide their own BDI, such as NFS
17 MAJOR:MINOR-fuseblk
23 The default backing dev, used for non-block device backed
30 Size of the read-ahead window in kilobytes
32 (read-write)
38 total write-back cache that relates to its current average
39 writeout speed in relation to the other devices.
42 percentage of the write-back cache to a particular device.
45 (read-write)
52 total write-back cache that relates to its current average
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Dsysfs-bus-surface_aggregator-tabletsw6 This attribute returns a string with the current type-cover
10 - "disconnected": The type-cover has been disconnected.
12 - "closed": The type-cover has been folded closed and lies on
15 - "laptop": The type-cover is open and in laptop-mode, i.e.,
18 - "folded-canvas": The type-cover has been folded back
19 part-ways, but does not lie flush with the back side of the
20 device. In general, this means that the kick-stand is used
23 - "folded-back": The type cover has been fully folded back and
24 lies flush with the back side of the device.
26 - "<unknown>": The current state is unknown to the driver, for
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Ddebugfs-scmi-raw7 in little-endian binary format to have it sent to the configured
11 Each write to the entry causes one command request to be built
12 and sent while the replies are read back one message at time
22 in little-endian binary format to have it sent to the configured
29 Each write to the entry causes one command request to be built
30 and sent while the replies are read back one message at time
38 Description: SCMI Raw message errors facility; any kind of timed-out or
41 Each read gives back one message at time (receiving an EOF at
52 Each read gives back one message at time (receiving an EOF at
60 Description: SCMI Raw stack reset facility; writing a value to this entry
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Dsysfs-platform-hidma-mgmt1 What: /sys/devices/platform/hidma-mgmt*/chanops/chan*/priority
10 What: /sys/devices/platform/hidma-mgmt*/chanops/chan*/weight
19 What: /sys/devices/platform/hidma-mgmt*/chreset_timeout_cycles
25 Contains the platform specific cycle value to wait after a
31 What: /sys/devices/platform/hidma-mgmt*/dma_channels
38 of HIDMA hardware. The value may change from chip to chip.
40 What: /sys/devices/platform/hidma-mgmt*/hw_version_major
48 What: /sys/devices/platform/hidma-mgmt*/hw_version_minor
56 What: /sys/devices/platform/hidma-mgmt*/max_rd_xactions
63 read transactions that can be issued back to back.
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Dsysfs-bus-most8 might return <1-1.1:1.0>
25 directory is created that allows applications to read and
34 This is used to set an arbitrary DCI register address an
35 application wants to read from or write to.
43 This is used to read and write the DCI register whose address
52 This is used to check and configure the MAC address.
60 This is used to check and configure the MAC address.
68 This is used to check and configure the MAC address.
76 This is used to check and configure the MEP filter address.
84 This is used to check and configure the MEP hash table.
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/Documentation/driver-api/md/
Draid5-cache.rst7 caches data to the RAID disks. The cache can be in write-through (supported
8 since 4.4) or write-back mode (supported since 4.10). mdadm (supported since
9 3.4) has a new option '--write-journal' to create array with cache. Please
10 refer to mdadm manual for details. By default (RAID array starts), the cache is
11 in write-through mode. A user can switch it to write-back mode by::
13 echo "write-back" > /sys/block/md0/md/journal_mode
15 And switch it back to write-through mode by::
17 echo "write-through" > /sys/block/md0/md/journal_mode
19 In both modes, all writes to the array will hit cache disk first. This means
22 write-through mode
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/Documentation/userspace-api/media/v4l/
Dmetafmt-pisp-be.rst1 .. SPDX-License-Identifier: GPL-2.0
3 .. _v4l2-meta-fmt-rpi-be-cfg:
9 Raspberry Pi PiSP Back End configuration format
12 The Raspberry Pi PiSP Back End memory-to-memory image signal processor is
14 to the `pispbe-config` output video device node using the
17 The PiSP Back End processes images in tiles, and its configuration requires
22 <https://datasheets.raspberrypi.com/camera/raspberry-pi-image-signal-processor-specification.pdf>`_
23 provide detailed description of the ISP back end configuration and programming
27 -------------------------
30 to be processed and is therefore shared across all the tiles of the image. So
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/Documentation/scsi/
Dsd-parameters.rst1 .. SPDX-License-Identifier: GPL-2.0
8 ---------------
16 write back 1 0 on on
17 write back, no read (daft) 1 1 on off
20 To set cache type to "write back" and save this setting to the drive::
22 # echo "write back" > cache_type
24 To modify the caching mode without making the change persistent, prepend
25 "temporary " to the cache type string. E.g.::
27 # echo "temporary write back" > cache_type
/Documentation/admin-guide/media/
Draspberrypi-pisp-be.rst1 .. SPDX-License-Identifier: GPL-2.0
4 Raspberry Pi PiSP Back End Memory-to-Memory ISP (pisp-be)
7 The PiSP Back End
10 The PiSP Back End is a memory-to-memory Image Signal Processor (ISP) which reads
13 pixel data back to memory through two distinct output channels.
18 The PiSP Back End ISP processes images in tiles. The handling of image
19 tessellation and the computation of low-level configuration parameters is
24 an image sensor through a MIPI CSI-2 compatible capture interface, storing them
25 in DRAM memory and processing them in the PiSP Back End to obtain images usable
29 The pisp-be driver
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/Documentation/admin-guide/
Ddell_rbu.rst15 It does not cover the support needed from applications to enable the BIOS to
16 update itself with the image downloaded in to the memory.
25 Please go to http://support.dell.com register and you can find info on
28 Libsmbios can also be used to update BIOS on Dell systems go to
34 using the driver breaks the image in to packets of fixed sizes and the driver
36 maintains a link list of packets for reading them back.
40 The rbu driver needs to have an application (as mentioned above) which will
41 inform the BIOS to enable the update in the next system reboot.
57 copied to a single contiguous block of physical memory.
63 changed to packets during the driver load time by specifying the load
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Dkernel-per-CPU-kthreads.rst2 Reducing OS jitter due to per-cpu kthreads
5 This document lists per-CPU kthreads in the Linux kernel and presents
6 options to control their OS jitter. Note that non-per-CPU kthreads are
7 not listed here. To reduce OS jitter from non-per-CPU kthreads, bind
8 them to a "housekeeping" CPU dedicated to such work.
13 - Documentation/core-api/irq/irq-affinity.rst: Binding interrupts to sets of CPUs.
15 - Documentation/admin-guide/cgroup-v1: Using cgroups to bind tasks to sets of CPUs.
17 - man taskset: Using the taskset command to bind tasks to sets
20 - man sched_setaffinity: Using the sched_setaffinity() system
21 call to bind tasks to sets of CPUs.
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Dquickly-build-trimmed-linux.rst1 .. SPDX-License-Identifier: (GPL-2.0+ OR CC-BY-4.0)
5 How to quickly build a trimmed Linux kernel
8 This guide explains how to swiftly build Linux kernels that are ideal for
9 testing purposes, but perfectly fine for day-to-day use, too.
14 *[If you are new to compiling Linux, ignore this TLDR and head over to the next
15 section below: it contains a step-by-step guide, which is more detailed, but
16 still brief and easy to follow; that guide and its accompanying reference
20 If your system uses techniques like Secure Boot, prepare it to permit starting
21 self-compiled Linux kernels; install compilers and everything else needed for
22 building Linux; make sure to have 12 Gigabyte free space in your home directory.
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/Documentation/sphinx/
Dparallel-wrapper.sh2 # SPDX-License-Identifier: GPL-2.0+
5 # environment (as exported by scripts/jobserver-exec), or fall back to
6 # the "auto" parallelism when "-jN" is not specified at the top-level
13 if [ -z "$parallel" ] ; then
14 # If no parallelism is specified at the top-level make, then
15 # fall back to the expected "-jauto" mode that the "htmldocs"
17 auto=$(perl -e 'open IN,"'"$sphinx"' --version 2>&1 |";
24 if [ -n "$auto" ] ; then
28 # Only if some parallelism has been determined do we add the -jN option.
29 if [ -n "$parallel" ] ; then
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/Documentation/maintainer/
Drebasing-and-merging.rst1 .. SPDX-License-Identifier: GPL-2.0
8 Git source-code management system. Git is a powerful tool with a lot of
10 ways to use those features. This document looks in particular at the use
15 One thing to be aware of in general is that, unlike many other projects,
19 maintainers result from a desire to avoid merges, while others come from
27 referred to as rebasing since both are done with the ``git rebase``
30 - Changing the parent (starting) commit upon which a series of patches is
36 - Changing the history of a set of patches by fixing (or deleting) broken
37 commits, adding patches, adding tags to commit changelogs, or changing
39 type of operation will be referred to as "history modification"
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/Documentation/block/
Ddeadline-iosched.rst5 This little file attempts to document how the deadline io scheduler works.
7 of interest to power users.
10 -----------------------
11 Refer to Documentation/block/switching-sched.rst for information on
12 selecting an io scheduler on a per-device basis.
14 ------------------------------------------------------------------------------
17 -----------------------
19 The goal of the deadline io scheduler is to attempt to guarantee a start
27 -----------------------
29 Similar to read_expire mentioned above, but for writes.
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/Documentation/userspace-api/
Dtee.rst1 .. SPDX-License-Identifier: GPL-2.0
8 include/uapi/linux/tee.h defines the generic interface to a TEE.
10 User space (the client) connects to the driver by opening /dev/tee[0-9]* or
11 /dev/teepriv[0-9]*.
13 - TEE_IOC_SHM_ALLOC allocates shared memory and returns a file descriptor
16 any longer it should be unmapped with munmap() to allow the reuse of
19 - TEE_IOC_VERSION lets user space know which TEE this driver handles and
22 - TEE_IOC_OPEN_SESSION opens a new session to a Trusted Application.
24 - TEE_IOC_INVOKE invokes a function in a Trusted Application.
26 - TEE_IOC_CANCEL may cancel an ongoing TEE_IOC_OPEN_SESSION or TEE_IOC_INVOKE.
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/Documentation/arch/powerpc/
Dtransactional_memory.rst5 POWER kernel support for this feature is currently limited to supporting
8 This file aims to sum up how it is supported by Linux and what behaviour you
17 instructions are presented to delimit transactions; transactions are
18 guaranteed to either complete atomically or roll back and undo any partial
49 transactional or non-transactional accesses within the system. In this
50 example, the transaction completes as though it were normal straight-line code
52 atomic move of money from the current account to the savings account has been
59 state will roll back to that at the 'tbegin', and control will continue from
60 'tbegin+4'. The branch to abort_handler will be taken this second time; the
69 - Conflicts with cache lines used by other processors
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Ddawr-power9.rst6 cause a checkstop if it points to cache inhibited (CI) memory. Currently Linux
7 has no way to distinguish CI memory when configuring the DAWR, so on affected
13 This issue is only present on processors prior to v2.3. The revision can be
34 PPC_PTRACE_GETHWDBGINFO call. This results in GDB falling back to
37 h_set_mode(DAWR) and h_set_dabr() will now return an error to the
43 migration from POWER8 to POWER9, at the cost of silently losing the
57 host. The watchpoint will fail and GDB will fall back to software
61 and configure the hardware to use the DAWR. This will run at full
63 guest is migrated to a POWER9 host, the watchpoint will be lost on the
64 POWER9. Loads and stores to the watchpoint locations will not be
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/Documentation/devicetree/bindings/input/
Dgoodix,gt7375p.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Douglas Anderson <dianders@chromium.org>
14 This touchscreen uses the i2c-hid protocol but has some non-standard
18 - $ref: /schemas/input/touchscreen/touchscreen.yaml#
23 - const: goodix,gt7375p
24 - items:
25 - const: goodix,gt7986u
26 - const: goodix,gt7375p
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/Documentation/devicetree/bindings/sound/
Dfsl,imx-asrc.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/sound/fsl,imx-asrc.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
13 with other Back Ends Audio controller such as ESAI, SSI and SAI. It has
14 three pairs to support three substreams within totally 10 channels.
17 - Shawn Guo <shawnguo@kernel.org>
18 - Sascha Hauer <s.hauer@pengutronix.de>
23 - enum:
24 - fsl,imx35-asrc
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/Documentation/i2c/
Di2c-address-translators.rst1 .. SPDX-License-Identifier: GPL-2.0
11 -----------
15 forwards transactions from upstream to the appropriate downstream port
21 An ATR looks similar to an i2c-mux except:
22 - the address on the parent and child busses can be different
23 - there is normally no need to select the child port; the alias used on the
27 The kernel i2c-atr provides a helper to implement an ATR within a driver.
30 devices on the child bus ends up in invoking the driver code to select
32 and picking one for each new device is up to the driver implementer. The
33 ATR maintains a table of currently assigned alias and uses it to modify
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/Documentation/admin-guide/mm/
Dzswap.rst9 in the process of being swapped out and attempts to compress them into a
10 dynamically allocated RAM-based memory pool. zswap basically trades CPU cycles
11 for potentially reduced swap I/O. This trade-off can also result in a
21 throttling by the hypervisor. This allows more work to get done with less
22 impact to the guest workload and guests sharing the I/O subsystem
24 drastically reducing life-shortening writes.
26 Zswap evicts pages from compressed cache on an LRU basis to the backing swap
35 An example command to enable zswap at runtime, assuming sysfs is mounted
42 back into memory all of the pages stored in the compressed pool. The
44 either invalidated or faulted back into memory. In order to force all
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Dtranshuge.rst16 But in the future it can expand to other filesystems.
26 requiring larger clear-page copy-page in page faults which is a
32 factor will affect all subsequent accesses to the memory for the whole
46 going to run faster.
48 Modern kernels support "multi-size THP" (mTHP), which introduces the
49 ability to allocate memory in blocks that are bigger than a base page
50 but smaller than traditional PMD-size (as described above), in
51 increments of a power-of-2 number of pages. mTHP can back anonymous
52 memory (for example 16K, 32K, 64K, etc). These THPs continue to be
53 PTE-mapped, but in many cases can still provide similar benefits to
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/Documentation/devicetree/bindings/iommu/
Dti,omap-iommu.txt4 - compatible : Should be one of,
5 "ti,omap2-iommu" for OMAP2/OMAP3 IOMMU instances
6 "ti,omap4-iommu" for OMAP4/OMAP5 IOMMU instances
7 "ti,dra7-dsp-iommu" for DRA7xx DSP IOMMU instances
8 "ti,dra7-iommu" for DRA7xx IOMMU instances
9 - ti,hwmods : Name of the hwmod associated with the IOMMU instance
10 - reg : Address space for the configuration registers
11 - interrupts : Interrupt specifier for the IOMMU instance
12 - #iommu-cells : Should be 0. OMAP IOMMUs are all "single-master" devices,
14 also refer to the generic bindings document for more info
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/Documentation/admin-guide/device-mapper/
Dera.rst2 dm-era
8 dm-era is a target that behaves similar to the linear target. In
11 maintains the current era as a monotonically increasing 32-bit
15 partially invalidating the contents of a cache to restore cache
16 coherency after rolling back a vendor snapshot.
36 ----------
38 Possibly move to a new era. You shouldn't assume the era has
43 ------------------
45 Create a clone of the metadata, to allow a userland process to read it.
48 ------------------
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