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authorLinus Torvalds <torvalds@linux-foundation.org>2018-04-03 22:35:51 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2018-04-03 22:35:51 +0200
commitbb2407a7219760926760f0448fddf00d625e5aec (patch)
tree68d2b7a17f0bb837d04d658a56baf16dd261210f /Documentation/driver-api
parentMerge tag 'leds_for_4.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/gi... (diff)
parentDocumentation/process: update FUSE project website (diff)
downloadlinux-bb2407a7219760926760f0448fddf00d625e5aec.tar.xz
linux-bb2407a7219760926760f0448fddf00d625e5aec.zip
Merge tag 'docs-4.17' of git://git.lwn.net/linux
Pull documentation updates from Jonathan Corbet: "There's been a fair amount of activity in Documentation/ this time around: - Lots of work aligning Documentation/ABI with reality, done by Aishwarya Pant. - The trace documentation has been converted to RST by Changbin Du - I thrashed up kernel-doc to deal with a parsing issue and to try to make the code more readable. It's still a 20+-year-old Perl hack, though. - Lots of other updates, typo fixes, and more" * tag 'docs-4.17' of git://git.lwn.net/linux: (82 commits) Documentation/process: update FUSE project website docs: kernel-doc: fix parsing of arrays dmaengine: Fix spelling for parenthesis in dmatest documentation dmaengine: Make dmatest.rst indeed reST compatible dmaengine: Add note to dmatest documentation about supported channels Documentation: magic-numbers: Fix typo Documentation: admin-guide: add kvmconfig, xenconfig and tinyconfig commands Input: alps - Update documentation for trackstick v3 format Documentation: Mention why %p prints ptrval COPYING: use the new text with points to the license files COPYING: create a new file with points to the Kernel license files Input: trackpoint: document sysfs interface xfs: Change URL for the project in xfs.txt char/bsr: add sysfs interface documentation acpi: nfit: document sysfs interface block: rbd: update sysfs interface Documentation/sparse: fix typo Documentation/CodingStyle: Add an example for braces docs/vm: update 00-INDEX kernel-doc: Remove __sched markings ...
Diffstat (limited to 'Documentation/driver-api')
-rw-r--r--Documentation/driver-api/dmaengine/dmatest.rst40
-rw-r--r--Documentation/driver-api/slimbus.rst2
2 files changed, 23 insertions, 19 deletions
diff --git a/Documentation/driver-api/dmaengine/dmatest.rst b/Documentation/driver-api/dmaengine/dmatest.rst
index 3922c0a3f0c0..7ce5e71c353e 100644
--- a/Documentation/driver-api/dmaengine/dmatest.rst
+++ b/Documentation/driver-api/dmaengine/dmatest.rst
@@ -6,10 +6,16 @@ Andy Shevchenko <andriy.shevchenko@linux.intel.com>
This small document introduces how to test DMA drivers using dmatest module.
+.. note::
+ The test suite works only on the channels that have at least one
+ capability of the following: DMA_MEMCPY (memory-to-memory), DMA_MEMSET
+ (const-to-memory or memory-to-memory, when emulated), DMA_XOR, DMA_PQ.
+
Part 1 - How to build the test module
=====================================
The menuconfig contains an option that could be found by following path:
+
Device Drivers -> DMA Engine support -> DMA Test client
In the configuration file the option called CONFIG_DMATEST. The dmatest could
@@ -18,11 +24,11 @@ be built as module or inside kernel. Let's consider those cases.
Part 2 - When dmatest is built as a module
==========================================
-Example of usage: ::
+Example of usage::
% modprobe dmatest channel=dma0chan0 timeout=2000 iterations=1 run=1
-...or: ::
+...or::
% modprobe dmatest
% echo dma0chan0 > /sys/module/dmatest/parameters/channel
@@ -30,14 +36,12 @@ Example of usage: ::
% echo 1 > /sys/module/dmatest/parameters/iterations
% echo 1 > /sys/module/dmatest/parameters/run
-...or on the kernel command line: ::
+...or on the kernel command line::
dmatest.channel=dma0chan0 dmatest.timeout=2000 dmatest.iterations=1 dmatest.run=1
-..hint:: available channel list could be extracted by running the following
- command:
-
-::
+.. hint::
+ available channel list could be extracted by running the following command::
% ls -1 /sys/class/dma/
@@ -59,12 +63,12 @@ before returning. For example, the following scripts wait for 42 tests
to complete before exiting. Note that if 'iterations' is set to 'infinite' then
waiting is disabled.
-Example: ::
+Example::
% modprobe dmatest run=1 iterations=42 wait=1
% modprobe -r dmatest
-...or: ::
+...or::
% modprobe dmatest run=1 iterations=42
% cat /sys/module/dmatest/parameters/wait
@@ -76,7 +80,7 @@ Part 3 - When built-in in the kernel
The module parameters that is supplied to the kernel command line will be used
for the first performed test. After user gets a control, the test could be
re-run with the same or different parameters. For the details see the above
-section "Part 2 - When dmatest is built as a module..."
+section `Part 2 - When dmatest is built as a module`_.
In both cases the module parameters are used as the actual values for the test
case. You always could check them at run-time by running ::
@@ -86,22 +90,22 @@ case. You always could check them at run-time by running ::
Part 4 - Gathering the test results
===================================
-Test results are printed to the kernel log buffer with the format: ::
+Test results are printed to the kernel log buffer with the format::
"dmatest: result <channel>: <test id>: '<error msg>' with src_off=<val> dst_off=<val> len=<val> (<err code>)"
-Example of output: ::
-
+Example of output::
% dmesg | tail -n 1
dmatest: result dma0chan0-copy0: #1: No errors with src_off=0x7bf dst_off=0x8ad len=0x3fea (0)
-The message format is unified across the different types of errors. A number in
-the parens represents additional information, e.g. error code, error counter,
-or status. A test thread also emits a summary line at completion listing the
-number of tests executed, number that failed, and a result code.
+The message format is unified across the different types of errors. A
+number in the parentheses represents additional information, e.g. error
+code, error counter, or status. A test thread also emits a summary line at
+completion listing the number of tests executed, number that failed, and a
+result code.
-Example: ::
+Example::
% dmesg | tail -n 1
dmatest: dma0chan0-copy0: summary 1 test, 0 failures 1000 iops 100000 KB/s (0)
diff --git a/Documentation/driver-api/slimbus.rst b/Documentation/driver-api/slimbus.rst
index 7555ecd538de..a97449cf603a 100644
--- a/Documentation/driver-api/slimbus.rst
+++ b/Documentation/driver-api/slimbus.rst
@@ -90,7 +90,7 @@ controller resets the bus. This notification allows the driver to take necessary
steps to boot the device so that it's functional after the bus has been reset.
Driver and Controller APIs:
---------------------------
+---------------------------
.. kernel-doc:: include/linux/slimbus.h
:internal: