| /linux/Documentation/block/ |
| H A D | null_blk.rst | 1 .. SPDX-License-Identifier: GPL-2.0
4 Null block device driver
10 The null block device (``/dev/nullb*``) is used for benchmarking the various
11 block-layer implementations. It emulates a block device of X gigabytes in size.
15 Multi-queue block-layer
17 - Request-based.
18 - Configurable submission queues per device.
20 No block-layer (Known as bio-based)
22 - Bio-based. IO requests are submitted directly to the device driver.
23 - Directly accepts bio data structure and returns them.
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| H A D | blk-mq.rst | 1 .. SPDX-License-Identifier: GPL-2.0
4 Multi-Queue Block IO Queueing Mechanism (blk-mq)
7 The Multi-Queue Block IO Queueing Mechanism is an API to enable fast storage
9 through queueing and submitting IO requests to block devices simultaneously,
16 ----------
19 development of the kernel. The Block IO subsystem aimed to achieve the best
26 However, with the development of Solid State Drives and Non-Volatile Memories
30 in those devices' design, the multi-queue mechanism was introduced.
32 The former design had a single queue to store block IO requests with a single
36 to different CPUs) wanted to perform block IO. Instead of this, the blk-mq API
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| H A D | biovecs.rst | 8 Instead, we have a new struct bvec_iter which represents a range of a biovec -
22 There are a bunch of new helper macros for hiding the gory details - in
37 wrapper around bio_advance_iter() that operates on bio->bi_iter, and also
40 There is a lower level advance function - bvec_iter_advance() - which takes
52 exactly one bvec at a time - for example, bio_copy_data() in block/bio.c,
54 wouldn't necessarily be the same size, the old code was tricky convoluted -
58 The new code is much more straightforward - have a look. This sort of
66 - again, this was being done in a fair number of places.
68 * Biovecs can be shared between multiple bios - a bvec iter can represent an
72 reached the end of a bio, not bi_vcnt - and the bio_iovec() macro takes
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| /linux/drivers/net/ethernet/mellanox/mlxfw/ |
| H A D | mlxfw_mfa2.c | 1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
2 /* Copyright (c) 2017-2019 Mellanox Technologies. All rights reserved */
18 * +----------------------------------+
20 * +----------------------------------+
22 * | +------------------------------+ | +-----------------+
23 * | | package descriptor tlv +-----> |num_devices=n |
24 * | +------------------------------+ | |num_components=m |
25 * +----------------------------------+ |CB offset |
27 * | +------------------------------+ | | |
28 * | | PSID tlv | | +-----------------+
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| /linux/include/xen/interface/io/ |
| H A D | blkif.h | 1 /* SPDX-License-Identifier: MIT */
5 * Unified block-device I/O interface for Xen guest OSes.
7 * Copyright (c) 2003-2004, Keir Fraser
17 * Front->back notifications: When enqueuing a new request, sending a
19 * hold-off mechanism provided by the ring macros). Backends must set
22 * Back->front notifications: When enqueuing a new response, sending a
24 * hold-off mechanism provided by the ring macros). Frontends must set
33 * If supported, the backend will write the key "multi-queue-max-queues" to
37 * key "multi-queue-num-queues" with the number they wish to use, which must be
39 * "multi-queue-max-queues".
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| /linux/Documentation/driver-api/mmc/ |
| H A D | mmc-test.rst | 1 .. SPDX-License-Identifier: GPL-2.0
16 - Verifying the functionality and performance of MMC and SD host controller drivers.
17 - Ensuring compatibility and reliability of MMC and SD devices.
18 - Identifying and diagnosing issues in the MMC subsystem.
33 .. code-block:: none
39 Device Drivers --->
40 <*> MMC/SD/SDIO card support --->
45 .. code-block:: none
55 .. code-block:: none
66 .. code-block:: sh
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| /linux/Documentation/crypto/ |
| H A D | devel-algos.rst | 5 --------------------------------------------
14 filled with each, struct crypto_alg, must be considered -- see below
47 Single-Block Symmetric Ciphers [CIPHER]
48 ---------------------------------------
55 block at a time and there are no dependencies between blocks at all.
69 Struct cipher_alg defines a single block cipher.
74 during any of these are in-flight.
78 KEY ---. PLAINTEXT ---.
80 .cia_setkey() -> .cia_encrypt()
82 '-----> CIPHERTEXT
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| /linux/Documentation/filesystems/ext4/ |
| H A D | allocators.rst | 1 .. SPDX-License-Identifier: GPL-2.0
3 Block and Inode Allocation Policy
4 ---------------------------------
9 that the head actuator and disk must perform to access a data block,
13 effect of concentrating writes on a single erase block, which can speed
17 The first tool that ext4 uses to combat fragmentation is the multi-block
18 allocator. When a file is first created, the block allocator
23 files) then the file data gets written out in a single multi-block
33 file's data blocks in the same block group as its inode. This cuts down
39 same block group as the directory, when feasible. The working assumption
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| /linux/Documentation/userspace-api/netlink/ |
| H A D | genetlink-legacy.rst | 1 .. SPDX-License-Identifier: BSD-3-Clause
9 the ``genetlink-legacy`` protocol level.
15 -------
29 --------------------
31 New Netlink families should use ``multi-attr`` to define arrays.
35 For reference the ``multi-attr`` array may look like this::
37 [ARRAY-ATTR]
41 [SOME-OTHER-ATTR]
42 [ARRAY-ATTR]
47 where ``ARRAY-ATTR`` is the array entry type.
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| /linux/Documentation/networking/ |
| H A D | iso15765-2.rst | 1 .. SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
4 ISO 15765-2 (ISO-TP)
10 ISO 15765-2, also known as ISO-TP, is a transport protocol specifically defined
12 industry, for example as the transport protocol for UDSonCAN (ISO 14229-3) or
13 emission-related diagnostic services (ISO 15031-5).
15 ISO-TP can be used both on CAN CC (aka Classical CAN) and CAN FD (CAN with
21 -------------------
23 * ISO 15765-2:2024 : Road vehicles - Diagnostic communication over Controller
27 ----------
29 In its simplest form, ISO-TP is based on two kinds of addressing modes for the
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| /linux/Documentation/driver-api/media/drivers/ |
| H A D | tuners.rst | 1 .. SPDX-License-Identifier: GPL-2.0
7 ------------------------
12 - L= LG_API (VHF_LO=0x01, VHF_HI=0x02, UHF=0x08, radio=0x04)
13 - P= PHILIPS_API (VHF_LO=0xA0, VHF_HI=0x90, UHF=0x30, radio=0x04)
14 - T= TEMIC_API (VHF_LO=0x02, VHF_HI=0x04, UHF=0x01)
15 - A= ALPS_API (VHF_LO=0x14, VHF_HI=0x12, UHF=0x11)
16 - M= PHILIPS_MK3 (VHF_LO=0x01, VHF_HI=0x02, UHF=0x04, radio=0x19)
19 -------------------
21 - Samsung Tuner identification: (e.g. TCPM9091PD27)
23 .. code-block:: none
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| /linux/sound/pci/ctxfi/ |
| H A D | ctresource.c | 1 // SPDX-License-Identifier: GPL-2.0-only
21 /* Resource allocation based on bit-map management mechanism */
24 unsigned int multi, unsigned int *ridx) in get_resource() argument
29 for (i = 0, n = multi; i < amount; i++) { in get_resource()
33 n = multi; in get_resource()
36 if (!(--n)) in get_resource()
42 return -ENOENT; in get_resource()
45 /* Mark the contiguous bits in resource bit-map as used */ in get_resource()
46 for (n = multi; n > 0; n--) { in get_resource()
50 i--; in get_resource()
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| /linux/lib/ |
| H A D | decompress_unxz.c | 1 // SPDX-License-Identifier: 0BSD
4 * Wrapper for decompressing XZ-compressed kernel, initramfs, and initrd
10 * Important notes about in-place decompression
20 * The worst case for in-place decompression is that the beginning of
22 * incompressible. Thus, we must look for worst-case expansion when the
29 * Block Header:
30 * Block Header (8-12)
32 * Block Padding (0-3)
34 * Index (8-20)
37 * Normally there is exactly one Block, but let's assume that there are
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| /linux/arch/riscv/kernel/ |
| H A D | cpufeature.c | 1 // SPDX-License-Identifier: GPL-2.0-only
24 #include <asm/text-patching.h>
32 #define NUM_ALPHA_EXTS ('z' - 'a' + 1)
41 /* Per-cpu ISA extensions. */
47 * riscv_isa_extension_base() - Get base extension word
63 * __riscv_isa_extension_available() - Check whether given extension
87 pr_err("Zicbom detected in ISA string, disabling as no cbom-block-size found\n"); in riscv_ext_zicbom_validate()
88 return -EINVAL; in riscv_ext_zicbom_validate()
91 pr_err("Zicbom disabled as cbom-block-size present, but is not a power-of-2\n"); in riscv_ext_zicbom_validate()
92 return -EINVAL; in riscv_ext_zicbom_validate()
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| /linux/drivers/gpu/drm/ast/ |
| H A D | ast_dp501.c | 1 // SPDX-License-Identifier: GPL-2.0
20 release_firmware(ast->dp501_fw); in ast_release_firmware()
21 ast->dp501_fw = NULL; in ast_release_firmware()
26 struct drm_device *dev = &ast->base; in ast_load_dp501_microcode()
29 ret = request_firmware(&ast->dp501_fw, "ast_dp501_fw.bin", dev->dev); in ast_load_dp501_microcode()
33 return devm_add_action_or_reset(dev->dev, ast_release_firmware, ast); in ast_load_dp501_microcode()
194 if (ast->config_mode != ast_use_p2a) in ast_backup_fw()
214 if (ast->config_mode != ast_use_p2a) in ast_launch_m68k()
220 if (ast->dp501_fw_addr) { in ast_launch_m68k()
221 fw_addr = ast->dp501_fw_addr; in ast_launch_m68k()
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| /linux/Documentation/userspace-api/media/v4l/ |
| H A D | vidioc-expbuf.rst | 1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
13 VIDIOC_EXPBUF - Export a buffer as a DMABUF file descriptor.
48 one. For the multi-planar API, applications set the ``plane`` field to
51 the single-planar API, applications must set ``plane`` to zero.
55 case of multi-planar API, every plane is exported separately using
60 other DMABUF-aware devices. Refer to :ref:`DMABUF importing <dmabuf>`
68 .. code-block:: c
77 if (ioctl(v4lfd, VIDIOC_EXPBUF, &expbuf) == -1) {
79 return -1;
87 .. code-block:: c
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| H A D | dmabuf.rst | 1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
30 devices, which may be V4L devices or other video-related devices (e.g.
34 such file descriptor are exchanged. The descriptors and meta-information
36 :c:type:`v4l2_plane` in the multi-planar API case). The
43 .. code-block:: c
52 if (ioctl(fd, VIDIOC_REQBUFS, &reqbuf) == -1) {
70 .. code-block:: c
82 if (ioctl(v4lfd, VIDIOC_QBUF, &buf) == -1) {
84 return -1;
90 Example 3.6. Queueing DMABUF using multi plane API
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| /linux/tools/testing/selftests/drivers/net/mlxsw/ |
| H A D | tc_restrictions.sh | 2 # SPDX-License-Identifier: GPL-2.0
41 # It is forbidden in mlxsw driver to have mixed-bound
42 # shared block with a drop rule.
45 check_err $? "Failed to create clsact with ingress block"
47 tc filter add block 22 protocol ip pref 1 handle 101 flower \
49 check_err $? "Failed to add drop rule to ingress bound block"
52 check_err $? "Failed to create another clsact with ingress shared block"
57 check_fail $? "Incorrect success to create another clsact with egress shared block"
59 tc filter del block 22 protocol ip pref 1 handle 101 flower
62 …check_err $? "Failed to create another clsact with egress shared block after blocker drop rule rem…
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| /linux/drivers/gpu/drm/ci/xfails/ |
| H A D | i915-tgl-fails.txt | 1 api_intel_allocator@fork-simple-stress-signal,Timeout
2 api_intel_allocator@open-vm,Timeout
3 api_intel_allocator@simple-allocator,Timeout
4 api_intel_bb@lot-of-buffers,Timeout
5 api_intel_bb@object-reloc-keep-cache,Timeout
6 api_intel_bb@offset-control,Timeout
7 api_intel_bb@render-ccs,Timeout
8 api_intel_bb@reset-bb,Timeout
9 core_auth@basic-auth,Timeout
11 core_setmaster@master-drop-set-user,Fail
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| /linux/Documentation/userspace-api/media/ |
| H A D | glossary.rst | 1 .. SPDX-License-Identifier: GPL-2.0 OR GFDL-1.1-no-invariants-or-later
58 **Field-programmable Gate Array**
63 See https://en.wikipedia.org/wiki/Field-programmable_gate_array.
67 :term:`SPI` device, or an :term:`IP Block` inside an
72 together make a larger user-facing functional peripheral. For
73 instance, the :term:`SoC` :term:`ISP` :term:`IP Block`
80 **Inter-Integrated Circuit**
82 A multi-master, multi-slave, packet switched, single-ended,
84 like sub-device hardware components.
86 See http://www.nxp.com/docs/en/user-guide/UM10204.pdf.
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| /linux/include/linux/ceph/ |
| H A D | rados.h | 1 /* SPDX-License-Identifier: GPL-2.0 */
29 #define CEPH_SNAPDIR ((__u64)(-1)) /* reserved for hidden .snap dir */
30 #define CEPH_NOSNAP ((__u64)(-2)) /* "head", "live" revision */
31 #define CEPH_MAXSNAP ((__u64)(-3)) /* largest valid snapid */
40 * object layout - how objects are mapped into PGs
47 * pg layout -- how PGs are mapped onto (sets of) OSDs
69 * pg_num -- base number of pseudorandomly placed pgs
71 * pgp_num -- effective number when calculating pg placement. this
78 * lpg_num -- localized pg count (per device). replicas are randomly
81 * lpgp_num -- as above.
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| /linux/lib/xz/ |
| H A D | xz_dec_stream.c | 1 // SPDX-License-Identifier: 0BSD
34 /* Position in variable-length integers and Check fields */
37 /* Variable-length integer decoded by dec_vli() */
44 /* CRC32 value in Block or Index */
59 /* Information stored in Block Header */
73 /* Size of the Block Header field */
79 /* Observed compressed size of the current Block */
82 /* Observed uncompressed size of the current Block */
89 * Hash calculated from the Block sizes. This is used to
93 } block; member
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| /linux/drivers/usb/typec/tcpm/ |
| H A D | Kconfig | 1 # SPDX-License-Identifier: GPL-2.0
4 tristate "USB Type-C Port Controller Manager"
9 The Type-C Port Controller Manager provides a USB PD and USB Type-C
10 state machine for use with Type-C Port Controllers.
15 tristate "Type-C Port Controller Interface driver"
19 Type-C Port Controller driver for TCPCI-compliant controller.
24 tristate "Richtek RT1711H Type-C chip driver"
26 Richtek RT1711H Type-C chip driver that works with
27 Type-C Port Controller Manager to provide USB PD and USB
28 Type-C functionalities.
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| /linux/Documentation/gpu/amdgpu/display/ |
| H A D | dc-glossary.rst | 7 'Documentation/gpu/amdgpu/amdgpu-glossary.rst'; if you cannot find it anywhere,
19 Application-Specific Integrated Circuit
49 Cathode Ray Tube Controller - commonly called "Controller" - Generates
83 Display Clock Generator block
108 Display Micro-Controller Unit
111 Display Micro-Controller Unit, version B
177 Multi Plane Overlay
180 Multi Stream Transport
225 Transition-Minimized Differential Signaling
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| /linux/Documentation/admin-guide/device-mapper/ |
| H A D | persistent-data.rst | 8 The more-sophisticated device-mapper targets require complex metadata
12 - Mikulas Patocka's multisnap implementation
13 - Heinz Mauelshagen's thin provisioning target
14 - Another btree-based caching target posted to dm-devel
15 - Another multi-snapshot target based on a design of Daniel Phillips
20 The persistent-data library is an attempt to provide a re-usable
21 framework for people who want to store metadata in device-mapper
22 targets. It's currently used by the thin-provisioning target and an
29 under drivers/md/persistent-data.
31 The block manager
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