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/linux/Documentation/driver-api/md/
H A 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
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
22 write-through mode
25 This mode mainly fixes the 'write hole' issue. For RAID 4/5/6 array, an unclean
27 and parity don't match. The reason is that a stripe write involves several RAID
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/linux/Documentation/ABI/testing/
H A 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
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
56 of the write-back cache to a particular device. The value is
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H A Ddebugfs-scmi-raw5 Description: SCMI Raw synchronous message injection/snooping facility; write
7 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
20 Description: SCMI Raw asynchronous message injection/snooping facility; write
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
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/linux/tools/perf/pmu-events/arch/arm64/
H A Drecommended.json9 "PublicDescription": "Attributable Level 1 data cache access, write",
12 "BriefDescription": "L1D cache access, write"
21 "PublicDescription": "Attributable Level 1 data cache refill, write",
24 "BriefDescription": "L1D cache refill, write"
39 "PublicDescription": "Attributable Level 1 data cache Write-Back, victim",
42 "BriefDescription": "L1D cache Write-Back, victi
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/linux/Documentation/scsi/
H A Dsd-parameters.rst1 .. SPDX-License-Identifier: GPL-2.0
8 ---------------
9 Enable/disable drive write & read cache.
12 cache_type string WCE RCD Write cache Read cache
14 write through 0 0 off on
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
27 # echo "temporary write back" > cache_type
/linux/arch/m68k/include/asm/
H A Dtraps.h122 #define MMU_WP (0x0800) /* write-protected */
142 /* bits for 68040 write back status word */
173 #define MMU060_RW (0x01800000) /* read/write */
174 # define MMU060_RW_W (0x00800000) /* write */
176 # define MMU060_RW_RMW (0x01800000) /* read/modify/write */
177 # define MMU060_W (0x00800000) /* general write, includes rmw */
189 #define MMU060_WP (0x00000080) /* write protection */
192 #define MMU060_WE (0x00000010) /* bus error on write */
222 unsigned short wb3s; /* write back 3 status */
223 unsigned short wb2s; /* write back 2 status */
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H A Dm53xxacr.h1 /* SPDX-License-Identifier: GPL-2.0 */
5 * m53xxacr.h -- ColdFire version 3 core cache support
18 * configurable write-through or copy-back operation.
30 #define CACR_DCM_WT 0x00000000 /* Cacheable write-through */
31 #define CACR_DCM_CB 0x00000100 /* Cacheable copy-back */
34 #define CACR_WPROTECT 0x00000020 /* Write protect*/
46 #define ACR_CM_WT 0x00000000 /* Cacheable, write-through */
47 #define ACR_CM_CB 0x00000020 /* Cacheable, copy-back */
50 #define ACR_WPROTECT 0x00000004 /* Write protect region */
66 #define CACHE_WAYS 4 /* 4 ways - set associative */
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/linux/arch/sh/include/asm/
H A Dwatchdog.h1 /* SPDX-License-Identifier: GPL-2.0+
3 * include/asm-sh/watchdog.h
25 * See cpu-sh2/watchdog.h for explanation of this stupidity..
36 * CKS0-2 supports a number of clock division ratios. At the time the watchdog
39 * lower than WTCSR_CKS_1024, else we drop back into the usec range.
42 * --------------------------------------------
63 * sh_wdt_read_cnt - Read from Counter
64 * Reads back the WTCNT value.
72 * sh_wdt_write_cnt - Write to Counter
73 * @val: Value to write
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/linux/drivers/comedi/drivers/
H A Dpcl730.c1 // SPDX-License-Identifier: GPL-2.0
4 * Driver for Advantech PCL-730 and clones
10 * Description: Advantech PCL-730 (& compatibles)
11 * Devices: [Advantech] PCL-730 (pcl730), PCM-3730 (pcm3730), PCL-725 (pcl725),
12 * PCL-733 (pcl733), PCL-734 (pcl734),
13 * [ADLink] ACL-7130 (acl7130), ACL-7225b (acl7225b),
14 * [ICP] ISO-730 (iso730), P8R8-DIO (p8r8dio), P16R16-DIO (p16r16dio),
15 * [Diamond Systems] OPMM-1616-XT (opmm-1616-xt), PEARL-MM-P (pearl-mm-p),
16 * IR104-PBF (ir104-pbf),
21 * [0] - I/O port base
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/linux/arch/sh/include/cpu-sh2/cpu/
H A Dcache.h1 /* SPDX-License-Identifier: GPL-2.0
3 * include/asm-sh/cpu-sh2/cache.h
22 /* 0x00000000-0x7fffffff: Write-through */
23 /* 0x80000000-0x9fffffff: Write-back */
24 /* 0xc0000000-0xdfffffff: Write-through */
26 /* 0x00000000-0x7fffffff: Write-back */
27 /* 0x80000000-0x9fffffff: Write-through */
28 /* 0xc0000000-0xdfffffff: Write-back */
/linux/Documentation/arch/x86/
H A Dmtrr.rst1 .. SPDX-License-Identifier: GPL-2.0
7 :Authors: - Richard Gooch <rgooch@atnf.csiro.au> - 3 Jun 1999
8 - Luis R. Rodriguez <mcgrof@do-not-panic.com> - April 9, 2015
17 non-PAT systems while a no-op but equally effective on PAT enabled systems.
37 a video (VGA) card on a PCI or AGP bus. Enabling write-combining
38 allows bus write transfers to be combined into a larger transfer
40 of image write operations 2.5 times or more.
46 The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
50 The Centaur C6 (WinChip) has 8 MCRs, allowing write-combining. These
62 which allows you to read and write. The other is an ioctl()
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/linux/drivers/infiniband/ulp/rtrs/
H A DREADME8 transport. It is optimized to transfer (read/write) IO blocks.
11 possibility to either write data from an sg list to the remote side
15 RTRS provides I/O fail-over and load-balancing capabilities by using
17 Documentation/ABI/testing/sysfs-class-rtrs-client).
26 --------
35 When processing an incoming write or read request, rtrs client uses memory
42 On an established session client sends to server write or read messages.
52 buffer after it returns back from the block layer and RNBD server.
53 The new rkey is sent back to the client along with the IO result.
64 ------------------------
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/linux/include/linux/
H A Dpstore_zone.h1 /* SPDX-License-Identifier: GPL-2.0 */
12 * struct pstore_zone_info - pstore/zone back-end driver structure
14 * @owner: Module which is responsible for this back-end driver.
15 * @name: Name of the back-end driver.
28 * @write: The same as @read, but the following error number:
29 * -EBUSY means try to write again later.
30 * -ENOMSG means to try next zone.
35 * @panic_write:The write operation only used for panic case. It's optional
39 * excluding -ENOMSG mean error. -ENOMSG means to try next zone.
52 pstore_zone_write_op write; member
/linux/arch/arm/mm/
H A Dcache-fa.S1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * linux/arch/arm/mm/cache-fa.S
6 * Copyright (C) 2008-2009 Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
8 * Based on cache-v4wb.S:
9 * Copyright (C) 1997-2002 Russell king
19 #include "proc-macros.S"
70 mcrne p15, 0, ip, c7, c10, 4 @ drain write buffer
81 * - start - start address (inclusive, page aligned)
82 * - end - end address (exclusive, page aligned)
83 * - flags - vma_area_struct flags describing address space
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/linux/tools/perf/pmu-events/arch/arm64/arm/cortex-a76/
H A Dcache.json23 …cess or Level 0 Macro-op cache access. This event counts any instruction fetch which accesses the …
27 …"PublicDescription": "This event counts any write-back of data from the L1 data cache to L2 or L3.…
31 …counts any transaction from L1 which looks up in the L2 cache, and any write-back from the L1 to t…
39 …write-back of data from the L2 cache to outside the core. This includes snoops to the L2 which ret…
43 …unts any full cache line write into the L2 cache which does not cause a linefill, including write-…
57 …unts any full cache line write into the L3 cache which does not cause a linefill, including write-…
67 …any cacheable read transaction returning datafrom the SCU, or for any cacheable write to the SCU.",
/linux/arch/arm/mach-omap2/
H A Dsleep34xx.S1 /* SPDX-License-Identifier: GPL-2.0-or-later */
5 * Karthik Dasu <karthik-dp@ti.com>
9 * Richard Woodruff <r-woodruff2@ti.com>
57 * with non-Thumb-2-capable firmware.
77 str r1, [r2, r3] @ write to l2dis_3630
86 .arch armv7-a
89 stmfd sp!, {r4 - r11, lr} @ save registers on stack
96 dsb @ data write barrier
103 ldmfd sp!, {r4 - r11, pc}
115 * omap34xx_cpu_suspend() - This bit of code saves the CPU context if needed
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/linux/arch/x86/lib/
H A Dusercopy_64.c1 // SPDX-License-Identifier: GPL-2.0-only
20 * clean_cache_range - write back a cache range with CLWB
22 * @size: number of bytes to write back
24 * Write back a cache range using the CLWB (cache line write back)
31 unsigned long clflush_mask = x86_clflush_size - 1; in clean_cache_range()
56 * __copy_user_nocache() uses non-temporal stores for the bulk in __copy_user_flushcache()
60 * - Require 8-byte alignment when size is 8 bytes or larger. in __copy_user_flushcache()
61 * - Require 4-byte alignment when size is 4 bytes. in __copy_user_flushcache()
72 flushed = dest - (unsigned long) dst; in __copy_user_flushcache()
73 if (size > flushed && !IS_ALIGNED(size - flushed, 8)) in __copy_user_flushcache()
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/linux/arch/sh/mm/
H A Dcache-sh2a.c1 // SPDX-License-Identifier: GPL-2.0-only
3 * arch/sh/mm/cache-sh2a.c
47 * Write back the dirty D-caches, but not invalidate them.
57 begin = (unsigned long)start & ~(L1_CACHE_BYTES-1); in sh2a__flush_wback_region()
58 end = ((unsigned long)start + size + L1_CACHE_BYTES-1) in sh2a__flush_wback_region()
59 & ~(L1_CACHE_BYTES-1); in sh2a__flush_wback_region()
66 if (((end - begin) >> PAGE_SHIFT) >= MAX_OCACHE_PAGES) { in sh2a__flush_wback_region()
89 * Write back the dirty D-caches and invalidate them.
97 begin = (unsigned long)start & ~(L1_CACHE_BYTES-1); in sh2a__flush_purge_region()
98 end = ((unsigned long)start + size + L1_CACHE_BYTES-1) in sh2a__flush_purge_region()
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H A Dcache-sh3.c1 // SPDX-License-Identifier: GPL-2.0-only
3 * arch/sh/mm/cache-sh3.c
23 * Write back the dirty D-caches, but not invalidate them.
38 begin = (unsigned long)start & ~(L1_CACHE_BYTES-1); in sh3__flush_wback_region()
39 end = ((unsigned long)start + size + L1_CACHE_BYTES-1) in sh3__flush_wback_region()
40 & ~(L1_CACHE_BYTES-1); in sh3__flush_wback_region()
66 * Write back the dirty D-caches and invalidate them.
76 begin = (unsigned long)start & ~(L1_CACHE_BYTES-1); in sh3__flush_purge_region()
77 end = ((unsigned long)start + size + L1_CACHE_BYTES-1) in sh3__flush_purge_region()
78 & ~(L1_CACHE_BYTES-1); in sh3__flush_purge_region()
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H A Dflush-sh4.c1 // SPDX-License-Identifier: GPL-2.0
9 * Write back the dirty D-caches, but not invalidate them.
19 v = aligned_start & ~(L1_CACHE_BYTES-1); in sh4__flush_wback_region()
20 end = (aligned_start + size + L1_CACHE_BYTES-1) in sh4__flush_wback_region()
21 & ~(L1_CACHE_BYTES-1); in sh4__flush_wback_region()
22 cnt = (end - v) / L1_CACHE_BYTES; in sh4__flush_wback_region()
33 cnt -= 8; in sh4__flush_wback_region()
38 cnt--; in sh4__flush_wback_region()
43 * Write back the dirty D-caches and invalidate them.
53 v = aligned_start & ~(L1_CACHE_BYTES-1); in sh4__flush_purge_region()
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/linux/fs/ubifs/
H A Dbudget.c1 // SPDX-License-Identifier: GPL-2.0-only
5 * Copyright (C) 2006-2008 Nokia Corporation.
12 * This file implements the budgeting sub-system which is responsible for UBIFS
27 * UBIFS starts writing back dirty inodes and pages, doing garbage collection,
35 * back at when trying to shrink the liability.
40 * shrink_liability - write-back some dirty pages/inodes.
41 * @c: UBIFS file-system description object
42 * @nr_to_write: how many dirty pages to write-back
44 * This function shrinks UBIFS liability by means of writing back some amount
48 * (@i_mutex) by the caller of the budgeting function, because write-back does
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/linux/drivers/staging/media/tegra-video/
H A Dvi.h1 /* SPDX-License-Identifier: GPL-2.0-only */
16 #include <media/media-entity.h>
17 #include <media/v4l2-async.h>
18 #include <media/v4l2-ctrls.h>
19 #include <media/v4l2-device.h>
20 #include <media/v4l2-dev.h>
21 #include <media/v4l2-subdev.h>
22 #include <media/videobuf2-v4l2.h>
44 * struct tegra_vi_ops - Tegra VI operations
45 * @vi_enable: soc-specific operations needed to enable/disable the VI peripheral
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/linux/Documentation/w1/slaves/
H A Dw1_therm.rst16 -----------
49 -1 if at least one sensor still in conversion, 1 if conversion is complete
60 adjust it (write). A temperature conversion time depends on the device type and
67 completion. Options 2, 3 can't be used in parasite power mode. To get back to
68 the default conversion time write ``0`` to ``conv_time``.
72 the sensor. Resolution is reset when the sensor gets power-cycled.
74 To store the current resolution in EEPROM, write ``0`` to ``w1_slave``.
81 Some non-genuine DS18B20 chips are fixed in 12-bit mode only, so the actual
82 resolution is read back from the chip and verified.
86 The write-only sysfs entry ``eeprom_cmd`` is an alternative for EEPROM operations.
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/linux/fs/netfs/
H A Dwrite_issue.c1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Network filesystem high-level (buffered) writeback.
11 * +---+---+-----+-----+---+----------+
13 * +---+---+-----+-----+---+----------+
15 * +------+------+ +----+----+
17 * (Stream 0) +------+------+ +----+----+
19 * +------+------+------+------+------+
21 * (Stream 1) +------+------+------+------+------+
30 * may be glued together into single vectored write RPCs.
59 /* Kill folio from streaming write. */ in netfs_kill_dirty_pages()
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/linux/arch/m68k/fpsp040/
H A Dget_op.S7 | type exception handler ('unsupp' - vector 55) and the unimplemented
8 | instruction exception handler ('unimp' - vector 11). 'get_op'
10 | opclass handler routine. See 68881/2 User's Manual table 4-11
17 | - For unnormalized numbers (opclass 0, 2, or 3) the
20 | - For a packed number (opclass 2) the number is unpacked and the
23 | - For denormalized numbers (opclass 0 or 2) the number(s) is not
30 | - If there is a move out with a packed number (opclass 3) the
32 | opclasses the number(s) are written back to the fsave stack
33 | and the instruction is then restored back into the '040. The
39 | routine. The number is normalized, put back on the stack and
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