€•s      Œsphinx.addnodes”Œdocument”“”)”}”(Œ	rawsource”Œ ”Œchildren”]”(Œtranslations”ŒLanguagesNode”“”)”}”(hhh]”(h Œpending_xref”“”)”}”(hhh]”Œdocutils.nodes”ŒText”“”ŒChinese (Simplified)”…””}”Œparent”hsbaŒ
attributes”}”(Œids”]”Œclasses”]”Œnames”]”Œdupnames”]”Œbackrefs”]”Œ	refdomain”Œstd”Œreftype”Œdoc”Œ	reftarget”Œ0/translations/zh_CN/driver-api/dmaengine/dmatest”Œmodname”NŒ	classname”NŒrefexplicit”ˆuŒtagname”hhhubh)”}”(hhh]”hŒChinese (Traditional)”…””}”hh2sbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ0/translations/zh_TW/driver-api/dmaengine/dmatest”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒItalian”…””}”hhFsbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ0/translations/it_IT/driver-api/dmaengine/dmatest”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒJapanese”…””}”hhZsbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ0/translations/ja_JP/driver-api/dmaengine/dmatest”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒKorean”…””}”hhnsbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ0/translations/ko_KR/driver-api/dmaengine/dmatest”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒSpanish”…””}”hh‚sbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ0/translations/sp_SP/driver-api/dmaengine/dmatest”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubeh}”(h]”h ]”h"]”h$]”h&]”Œcurrent_language”ŒEnglish”uh1h
hhŒ	_document”hŒsource”NŒline”NubhŒsection”“”)”}”(hhh]”(hŒtitle”“”)”}”(hŒDMA Test Guide”h]”hŒDMA Test Guide”…””}”(hh¨hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h¦hh£hžhhŸŒJ/var/lib/git/docbuild/linux/Documentation/driver-api/dmaengine/dmatest.rst”h KubhŒ	paragraph”“”)”}”(hŒ3Andy Shevchenko <andriy.shevchenko@linux.intel.com>”h]”(hŒAndy Shevchenko <”…””}”(hh¹hžhhŸNh NubhŒ	reference”“”)”}”(hŒ!andriy.shevchenko@linux.intel.com”h]”hŒ!andriy.shevchenko@linux.intel.com”…””}”(hhÃhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”Œrefuri”Œ(mailto:andriy.shevchenko@linux.intel.com”uh1hÁhh¹ubhŒ>”…””}”(hh¹hžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h Khh£hžhubh¸)”}”(hŒLThis small document introduces how to test DMA drivers using dmatest module.”h]”hŒLThis small document introduces how to test DMA drivers using dmatest module.”…””}”(hhÝhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h Khh£hžhubh¸)”}”(hXˆ  The dmatest module tests DMA memcpy, memset, XOR and RAID6 P+Q operations using
various lengths and various offsets into the source and destination buffers. It
will initialize both buffers with a repeatable pattern and verify that the DMA
engine copies the requested region and nothing more. It will also verify that
the bytes aren't swapped around, and that the source buffer isn't modified.”h]”hXŒ  The dmatest module tests DMA memcpy, memset, XOR and RAID6 P+Q operations using
various lengths and various offsets into the source and destination buffers. It
will initialize both buffers with a repeatable pattern and verify that the DMA
engine copies the requested region and nothing more. It will also verify that
the bytes arenâ€™t swapped around, and that the source buffer isnâ€™t modified.”…””}”(hhëhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h K	hh£hžhubh¸)”}”(hŒ·The dmatest module can be configured to test a specific channel. It can also
test multiple channels at the same time, and it can start multiple threads
competing for the same channel.”h]”hŒ·The dmatest module can be configured to test a specific channel. It can also
test multiple channels at the same time, and it can start multiple threads
competing for the same channel.”…””}”(hhùhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h Khh£hžhubhŒnote”“”)”}”(hŒÎThe 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.”h]”h¸)”}”(hŒÎThe 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.”h]”hŒÎThe 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.”…””}”(hj  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h Khj	  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j  hh£hžhhŸh¶h Nubj  )”}”(hŒYIn case of any related questions use the official mailing list
dmaengine@vger.kernel.org.”h]”h¸)”}”(hŒYIn case of any related questions use the official mailing list
dmaengine@vger.kernel.org.”h]”(hŒ?In case of any related questions use the official mailing list
”…””}”(hj%  hžhhŸNh NubhÂ)”}”(hŒdmaengine@vger.kernel.org”h]”hŒdmaengine@vger.kernel.org”…””}”(hj-  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”Œrefuri”Œ mailto:dmaengine@vger.kernel.org”uh1hÁhj%  ubhŒ.”…””}”(hj%  hžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h Khj!  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j  hh£hžhhŸh¶h Nubh¢)”}”(hhh]”(h§)”}”(hŒ%Part 1 - How to build the test module”h]”hŒ%Part 1 - How to build the test module”…””}”(hjP  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h¦hjM  hžhhŸh¶h Kubh¸)”}”(hŒHThe menuconfig contains an option that could be found by following path:”h]”hŒHThe menuconfig contains an option that could be found by following path:”…””}”(hj^  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h KhjM  hžhubhŒblock_quote”“”)”}”(hŒ8Device Drivers -> DMA Engine support -> DMA Test client
”h]”h¸)”}”(hŒ7Device Drivers -> DMA Engine support -> DMA Test client”h]”hŒ7Device Drivers -> DMA Engine support -> DMA Test client”…””}”(hjr  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h K!hjn  ubah}”(h]”h ]”h"]”h$]”h&]”uh1jl  hŸh¶h K!hjM  hžhubh¸)”}”(hŒŽIn the configuration file the option called CONFIG_DMATEST. The dmatest could
be built as module or inside kernel. Let's consider those cases.”h]”hŒIn the configuration file the option called CONFIG_DMATEST. The dmatest could
be built as module or inside kernel. Letâ€™s consider those cases.”…””}”(hj†  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h K#hjM  hžhubeh}”(h]”Œ#part-1-how-to-build-the-test-module”ah ]”h"]”Œ%part 1 - how to build the test module”ah$]”h&]”uh1h¡hh£hžhhŸh¶h Kubh¢)”}”(hhh]”(h§)”}”(hŒ*Part 2 - When dmatest is built as a module”h]”hŒ*Part 2 - When dmatest is built as a module”…””}”(hjŸ  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h¦hjœ  hžhhŸh¶h K'ubh¸)”}”(hŒExample of usage::”h]”hŒExample of usage:”…””}”(hj­  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h K)hjœ  hžhubhŒliteral_block”“”)”}”(hŒD% modprobe dmatest timeout=2000 iterations=1 channel=dma0chan0 run=1”h]”hŒD% modprobe dmatest timeout=2000 iterations=1 channel=dma0chan0 run=1”…””}”hj½  sbah}”(h]”h ]”h"]”h$]”h&]”Œ	xml:space”Œpreserve”uh1j»  hŸh¶h K+hjœ  hžhubh¸)”}”(hŒ...or::”h]”hŒ...or:”…””}”(hjÍ  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h K-hjœ  hžhubj¼  )”}”(hŒä% modprobe dmatest
% echo 2000 > /sys/module/dmatest/parameters/timeout
% echo 1 > /sys/module/dmatest/parameters/iterations
% echo dma0chan0 > /sys/module/dmatest/parameters/channel
% echo 1 > /sys/module/dmatest/parameters/run”h]”hŒä% modprobe dmatest
% echo 2000 > /sys/module/dmatest/parameters/timeout
% echo 1 > /sys/module/dmatest/parameters/iterations
% echo dma0chan0 > /sys/module/dmatest/parameters/channel
% echo 1 > /sys/module/dmatest/parameters/run”…””}”hjÛ  sbah}”(h]”h ]”h"]”h$]”h&]”jË  jÌ  uh1j»  hŸh¶h K/hjœ  hžhubh¸)”}”(hŒ"...or on the kernel command line::”h]”hŒ!...or on the kernel command line:”…””}”(hjé  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h K5hjœ  hžhubj¼  )”}”(hŒQdmatest.timeout=2000 dmatest.iterations=1 dmatest.channel=dma0chan0 dmatest.run=1”h]”hŒQdmatest.timeout=2000 dmatest.iterations=1 dmatest.channel=dma0chan0 dmatest.run=1”…””}”hj÷  sbah}”(h]”h ]”h"]”h$]”h&]”jË  jÌ  uh1j»  hŸh¶h K7hjœ  hžhubh¸)”}”(hŒ=Example of multi-channel test usage (new in the 5.0 kernel)::”h]”hŒ<Example of multi-channel test usage (new in the 5.0 kernel):”…””}”(hj  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h K9hjœ  hžhubj¼  )”}”(hXX  % modprobe dmatest
% echo 2000 > /sys/module/dmatest/parameters/timeout
% echo 1 > /sys/module/dmatest/parameters/iterations
% echo dma0chan0 > /sys/module/dmatest/parameters/channel
% echo dma0chan1 > /sys/module/dmatest/parameters/channel
% echo dma0chan2 > /sys/module/dmatest/parameters/channel
% echo 1 > /sys/module/dmatest/parameters/run”h]”hXX  % modprobe dmatest
% echo 2000 > /sys/module/dmatest/parameters/timeout
% echo 1 > /sys/module/dmatest/parameters/iterations
% echo dma0chan0 > /sys/module/dmatest/parameters/channel
% echo dma0chan1 > /sys/module/dmatest/parameters/channel
% echo dma0chan2 > /sys/module/dmatest/parameters/channel
% echo 1 > /sys/module/dmatest/parameters/run”…””}”hj  sbah}”(h]”h ]”h"]”h$]”h&]”jË  jÌ  uh1j»  hŸh¶h K;hjœ  hžhubj  )”}”(hX5  For all tests, starting in the 5.0 kernel, either single- or multi-channel,
the channel parameter(s) must be set after all other parameters. It is at
that time that the existing parameter values are acquired for use by the
thread(s). All other parameters are shared. Therefore, if changes are made
to any of the other parameters, and an additional channel specified, the
(shared) parameters used for all threads will use the new values.
After the channels are specified, each thread is set as pending. All threads
begin execution when the run parameter is set to 1.”h]”h¸)”}”(hX5  For all tests, starting in the 5.0 kernel, either single- or multi-channel,
the channel parameter(s) must be set after all other parameters. It is at
that time that the existing parameter values are acquired for use by the
thread(s). All other parameters are shared. Therefore, if changes are made
to any of the other parameters, and an additional channel specified, the
(shared) parameters used for all threads will use the new values.
After the channels are specified, each thread is set as pending. All threads
begin execution when the run parameter is set to 1.”h]”hX5  For all tests, starting in the 5.0 kernel, either single- or multi-channel,
the channel parameter(s) must be set after all other parameters. It is at
that time that the existing parameter values are acquired for use by the
thread(s). All other parameters are shared. Therefore, if changes are made
to any of the other parameters, and an additional channel specified, the
(shared) parameters used for all threads will use the new values.
After the channels are specified, each thread is set as pending. All threads
begin execution when the run parameter is set to 1.”…””}”(hj%  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h KDhj!  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j  hjœ  hžhhŸh¶h NubhŒhint”“”)”}”(hŒgA list of available channels can be found by running the following command::

  % ls -1 /sys/class/dma/”h]”(h¸)”}”(hŒLA list of available channels can be found by running the following command::”h]”hŒKA list of available channels can be found by running the following command:”…””}”(hj?  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h KNhj;  ubj¼  )”}”(hŒ% ls -1 /sys/class/dma/”h]”hŒ% ls -1 /sys/class/dma/”…””}”hjM  sbah}”(h]”h ]”h"]”h$]”h&]”jË  jÌ  uh1j»  hŸh¶h KPhj;  ubeh}”(h]”h ]”h"]”h$]”h&]”uh1j9  hjœ  hžhhŸh¶h Nubh¸)”}”(hŒÅOnce started a message like " dmatest: Added 1 threads using dma0chan0" is
emitted. A thread for that specific channel is created and is now pending, the
pending thread is started once run is to 1.”h]”hŒÉOnce started a message like â€œ dmatest: Added 1 threads using dma0chan0â€ is
emitted. A thread for that specific channel is created and is now pending, the
pending thread is started once run is to 1.”…””}”(hja  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h KRhjœ  hžhubh¸)”}”(hŒ@Note that running a new test will not stop any in progress test.”h]”hŒ@Note that running a new test will not stop any in progress test.”…””}”(hjo  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h KVhjœ  hžhubh¸)”}”(hŒ7The following command returns the state of the test. ::”h]”hŒ4The following command returns the state of the test.”…””}”(hj}  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h KXhjœ  hžhubj¼  )”}”(hŒ(% cat /sys/module/dmatest/parameters/run”h]”hŒ(% cat /sys/module/dmatest/parameters/run”…””}”hj‹  sbah}”(h]”h ]”h"]”h$]”h&]”jË  jÌ  uh1j»  hŸh¶h KZhjœ  hžhubh¸)”}”(hXÙ  To wait for test completion userspace can poll 'run' until it is false, or use
the wait parameter. Specifying 'wait=1' when loading the module causes module
initialization to pause until a test run has completed, while reading
/sys/module/dmatest/parameters/wait waits for any running test to complete
before returning. For example, the following scripts wait for 42 tests
to complete before exiting. Note that if 'iterations' is set to 'infinite' then
waiting is disabled.”h]”hXé  To wait for test completion userspace can poll â€˜runâ€™ until it is false, or use
the wait parameter. Specifying â€˜wait=1â€™ when loading the module causes module
initialization to pause until a test run has completed, while reading
/sys/module/dmatest/parameters/wait waits for any running test to complete
before returning. For example, the following scripts wait for 42 tests
to complete before exiting. Note that if â€˜iterationsâ€™ is set to â€˜infiniteâ€™ then
waiting is disabled.”…””}”(hj™  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h K\hjœ  hžhubh¸)”}”(hŒ	Example::”h]”hŒExample:”…””}”(hj§  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h Kdhjœ  hžhubj¼  )”}”(hŒC% modprobe dmatest run=1 iterations=42 wait=1
% modprobe -r dmatest”h]”hŒC% modprobe dmatest run=1 iterations=42 wait=1
% modprobe -r dmatest”…””}”hjµ  sbah}”(h]”h ]”h"]”h$]”h&]”jË  jÌ  uh1j»  hŸh¶h Kfhjœ  hžhubh¸)”}”(hŒ...or::”h]”hŒ...or:”…””}”(hjÃ  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h Kihjœ  hžhubj¼  )”}”(hŒf% modprobe dmatest run=1 iterations=42
% cat /sys/module/dmatest/parameters/wait
% modprobe -r dmatest”h]”hŒf% modprobe dmatest run=1 iterations=42
% cat /sys/module/dmatest/parameters/wait
% modprobe -r dmatest”…””}”hjÑ  sbah}”(h]”h ]”h"]”h$]”h&]”jË  jÌ  uh1j»  hŸh¶h Kkhjœ  hžhubeh}”(h]”Œ(part-2-when-dmatest-is-built-as-a-module”ah ]”h"]”Œ*part 2 - when dmatest is built as a module”ah$]”h&]”uh1h¡hh£hžhhŸh¶h K'Œ
referenced”Kubh¢)”}”(hhh]”(h§)”}”(hŒ$Part 3 - When built-in in the kernel”h]”hŒ$Part 3 - When built-in in the kernel”…””}”(hjë  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h¦hjè  hžhhŸh¶h Kpubh¸)”}”(hX  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`_.”h]”(hŒîThe 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 ”…””}”(hjù  hžhhŸNh NubhÂ)”}”(hŒ-`Part 2 - When dmatest is built as a module`_”h]”hŒ*Part 2 - When dmatest is built as a module”…””}”(hj  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”Œname”Œ*Part 2 - When dmatest is built as a module”Œrefid”já  uh1hÁhjù  Œresolved”KubhŒ.”…””}”(hjù  hžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h Krhjè  hžhubh¸)”}”(hŒŠIn 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 ::”h]”hŒ‡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”…””}”(hj  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h Kwhjè  hžhubj¼  )”}”(hŒ,% grep -H . /sys/module/dmatest/parameters/*”h]”hŒ,% grep -H . /sys/module/dmatest/parameters/*”…””}”hj+  sbah}”(h]”h ]”h"]”h$]”h&]”jË  jÌ  uh1j»  hŸh¶h Kzhjè  hžhubeh}”(h]”Œ"part-3-when-built-in-in-the-kernel”ah ]”h"]”Œ$part 3 - when built-in in the kernel”ah$]”h&]”uh1h¡hh£hžhhŸh¶h Kpubh¢)”}”(hhh]”(h§)”}”(hŒ#Part 4 - Gathering the test results”h]”hŒ#Part 4 - Gathering the test results”…””}”(hjD  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h¦hjA  hžhhŸh¶h K}ubh¸)”}”(hŒCTest results are printed to the kernel log buffer with the format::”h]”hŒBTest results are printed to the kernel log buffer with the format:”…””}”(hjR  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h KhjA  hžhubj¼  )”}”(hŒm"dmatest: result <channel>: <test id>: '<error msg>' with src_off=<val> dst_off=<val> len=<val> (<err code>)"”h]”hŒm"dmatest: result <channel>: <test id>: '<error msg>' with src_off=<val> dst_off=<val> len=<val> (<err code>)"”…””}”hj`  sbah}”(h]”h ]”h"]”h$]”h&]”jË  jÌ  uh1j»  hŸh¶h KhjA  hžhubh¸)”}”(hŒExample of output::”h]”hŒExample of output:”…””}”(hjn  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h KƒhjA  hžhubj¼  )”}”(hŒr% dmesg | tail -n 1
dmatest: result dma0chan0-copy0: #1: No errors with src_off=0x7bf dst_off=0x8ad len=0x3fea (0)”h]”hŒr% dmesg | tail -n 1
dmatest: result dma0chan0-copy0: #1: No errors with src_off=0x7bf dst_off=0x8ad len=0x3fea (0)”…””}”hj|  sbah}”(h]”h ]”h"]”h$]”h&]”jË  jÌ  uh1j»  hŸh¶h K…hjA  hžhubh¸)”}”(hX0  The message format is unified across the different types of errors. A
number in the parentheses represents additional information, e.g. error
code, error counter, or status. A test thread also emits a summary line at
completion listing the number of tests executed, number that failed, and a
result code.”h]”hX0  The message format is unified across the different types of errors. A
number in the parentheses represents additional information, e.g. error
code, error counter, or status. A test thread also emits a summary line at
completion listing the number of tests executed, number that failed, and a
result code.”…””}”(hjŠ  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h KˆhjA  hžhubh¸)”}”(hŒ	Example::”h]”hŒExample:”…””}”(hj˜  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h KŽhjA  hžhubj¼  )”}”(hŒb% dmesg | tail -n 1
dmatest: dma0chan0-copy0: summary 1 test, 0 failures 1000 iops 100000 KB/s (0)”h]”hŒb% dmesg | tail -n 1
dmatest: dma0chan0-copy0: summary 1 test, 0 failures 1000 iops 100000 KB/s (0)”…””}”hj¦  sbah}”(h]”h ]”h"]”h$]”h&]”jË  jÌ  uh1j»  hŸh¶h KhjA  hžhubh¸)”}”(hŒ\The details of a data miscompare error are also emitted, but do not follow the
above format.”h]”hŒ\The details of a data miscompare error are also emitted, but do not follow the
above format.”…””}”(hj´  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h K“hjA  hžhubeh}”(h]”Œ!part-4-gathering-the-test-results”ah ]”h"]”Œ#part 4 - gathering the test results”ah$]”h&]”uh1h¡hh£hžhhŸh¶h K}ubh¢)”}”(hhh]”(h§)”}”(hŒ$Part 5 - Handling channel allocation”h]”hŒ$Part 5 - Handling channel allocation”…””}”(hjÍ  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h¦hjÊ  hžhhŸh¶h K—ubh¢)”}”(hhh]”(h§)”}”(hŒAllocating Channels”h]”hŒAllocating Channels”…””}”(hjÞ  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h¦hjÛ  hžhhŸh¶h Kšubh¸)”}”(hŒ·Channels do not need to be configured prior to starting a test run. Attempting
to run the test without configuring the channels will result in testing any
channels that are available.”h]”hŒ·Channels do not need to be configured prior to starting a test run. Attempting
to run the test without configuring the channels will result in testing any
channels that are available.”…””}”(hjì  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h KœhjÛ  hžhubh¸)”}”(hŒ	Example::”h]”hŒExample:”…””}”(hjú  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h K hjÛ  hžhubj¼  )”}”(hŒ`% echo 1 > /sys/module/dmatest/parameters/run
dmatest: No channels configured, continue with any”h]”hŒ`% echo 1 > /sys/module/dmatest/parameters/run
dmatest: No channels configured, continue with any”…””}”hj  sbah}”(h]”h ]”h"]”h$]”h&]”jË  jÌ  uh1j»  hŸh¶h K¢hjÛ  hžhubh¸)”}”(hŒ¹Channels are registered using the "channel" parameter. Channels can be requested by their
name, once requested, the channel is registered and a pending thread is added to the test list.”h]”hŒ½Channels are registered using the â€œchannelâ€ parameter. Channels can be requested by their
name, once requested, the channel is registered and a pending thread is added to the test list.”…””}”(hj  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h K¥hjÛ  hžhubh¸)”}”(hŒ	Example::”h]”hŒExample:”…””}”(hj$  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h K¨hjÛ  hžhubj¼  )”}”(hŒb% echo dma0chan2 > /sys/module/dmatest/parameters/channel
dmatest: Added 1 threads using dma0chan2”h]”hŒb% echo dma0chan2 > /sys/module/dmatest/parameters/channel
dmatest: Added 1 threads using dma0chan2”…””}”hj2  sbah}”(h]”h ]”h"]”h$]”h&]”jË  jÌ  uh1j»  hŸh¶h KªhjÛ  hžhubh¸)”}”(hŒŸMore channels can be added by repeating the example above.
Reading back the channel parameter will return the name of last channel that was added successfully.”h]”hŒŸMore channels can be added by repeating the example above.
Reading back the channel parameter will return the name of last channel that was added successfully.”…””}”(hj@  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h K­hjÛ  hžhubh¸)”}”(hŒ	Example::”h]”hŒExample:”…””}”(hjN  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h K°hjÛ  hžhubj¼  )”}”(hŒü% echo dma0chan1 > /sys/module/dmatest/parameters/channel
dmatest: Added 1 threads using dma0chan1
% echo dma0chan2 > /sys/module/dmatest/parameters/channel
dmatest: Added 1 threads using dma0chan2
% cat /sys/module/dmatest/parameters/channel
dma0chan2”h]”hŒü% echo dma0chan1 > /sys/module/dmatest/parameters/channel
dmatest: Added 1 threads using dma0chan1
% echo dma0chan2 > /sys/module/dmatest/parameters/channel
dmatest: Added 1 threads using dma0chan2
% cat /sys/module/dmatest/parameters/channel
dma0chan2”…””}”hj\  sbah}”(h]”h ]”h"]”h$]”h&]”jË  jÌ  uh1j»  hŸh¶h K²hjÛ  hžhubh¸)”}”(hŒŽAnother method of requesting channels is to request a channel with an empty string, Doing so
will request all channels available to be tested:”h]”hŒŽAnother method of requesting channels is to request a channel with an empty string, Doing so
will request all channels available to be tested:”…””}”(hjj  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h K¹hjÛ  hžhubh¸)”}”(hŒ	Example::”h]”hŒExample:”…””}”(hjx  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h K¼hjÛ  hžhubj¼  )”}”(hXQ  % echo "" > /sys/module/dmatest/parameters/channel
dmatest: Added 1 threads using dma0chan0
dmatest: Added 1 threads using dma0chan3
dmatest: Added 1 threads using dma0chan4
dmatest: Added 1 threads using dma0chan5
dmatest: Added 1 threads using dma0chan6
dmatest: Added 1 threads using dma0chan7
dmatest: Added 1 threads using dma0chan8”h]”hXQ  % echo "" > /sys/module/dmatest/parameters/channel
dmatest: Added 1 threads using dma0chan0
dmatest: Added 1 threads using dma0chan3
dmatest: Added 1 threads using dma0chan4
dmatest: Added 1 threads using dma0chan5
dmatest: Added 1 threads using dma0chan6
dmatest: Added 1 threads using dma0chan7
dmatest: Added 1 threads using dma0chan8”…””}”hj†  sbah}”(h]”h ]”h"]”h$]”h&]”jË  jÌ  uh1j»  hŸh¶h K¾hjÛ  hžhubh¸)”}”(hŒ}At any point during the test configuration, reading the "test_list" parameter will
print the list of currently pending tests.”h]”hŒAt any point during the test configuration, reading the â€œtest_listâ€ parameter will
print the list of currently pending tests.”…””}”(hj”  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h KÇhjÛ  hžhubh¸)”}”(hŒ	Example::”h]”hŒExample:”…””}”(hj¢  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h KÊhjÛ  hžhubj¼  )”}”(hX#  % cat /sys/module/dmatest/parameters/test_list
dmatest: 1 threads using dma0chan0
dmatest: 1 threads using dma0chan3
dmatest: 1 threads using dma0chan4
dmatest: 1 threads using dma0chan5
dmatest: 1 threads using dma0chan6
dmatest: 1 threads using dma0chan7
dmatest: 1 threads using dma0chan8”h]”hX#  % cat /sys/module/dmatest/parameters/test_list
dmatest: 1 threads using dma0chan0
dmatest: 1 threads using dma0chan3
dmatest: 1 threads using dma0chan4
dmatest: 1 threads using dma0chan5
dmatest: 1 threads using dma0chan6
dmatest: 1 threads using dma0chan7
dmatest: 1 threads using dma0chan8”…””}”hj°  sbah}”(h]”h ]”h"]”h$]”h&]”jË  jÌ  uh1j»  hŸh¶h KÌhjÛ  hžhubh¸)”}”(hŒNote: Channels will have to be configured for each test run as channel configurations do not
carry across to the next test run.”h]”hŒNote: Channels will have to be configured for each test run as channel configurations do not
carry across to the next test run.”…””}”(hj¾  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h KÕhjÛ  hžhubeh}”(h]”Œallocating-channels”ah ]”h"]”Œallocating channels”ah$]”h&]”uh1h¡hjÊ  hžhhŸh¶h Kšubh¢)”}”(hhh]”(h§)”}”(hŒReleasing Channels”h]”hŒReleasing Channels”…””}”(hj×  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h¦hjÔ  hžhhŸh¶h KÙubh¸)”}”(hŒ*Channels can be freed by setting run to 0.”h]”hŒ*Channels can be freed by setting run to 0.”…””}”(hjå  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h KÛhjÔ  hžhubh¸)”}”(hŒ	Example::”h]”hŒExample:”…””}”(hjó  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h KÝhjÔ  hžhubj¼  )”}”(hŒà% echo dma0chan1 > /sys/module/dmatest/parameters/channel
dmatest: Added 1 threads using dma0chan1
% cat /sys/class/dma/dma0chan1/in_use
1
% echo 0 > /sys/module/dmatest/parameters/run
% cat /sys/class/dma/dma0chan1/in_use
0”h]”hŒà% echo dma0chan1 > /sys/module/dmatest/parameters/channel
dmatest: Added 1 threads using dma0chan1
% cat /sys/class/dma/dma0chan1/in_use
1
% echo 0 > /sys/module/dmatest/parameters/run
% cat /sys/class/dma/dma0chan1/in_use
0”…””}”hj  sbah}”(h]”h ]”h"]”h$]”h&]”jË  jÌ  uh1j»  hŸh¶h KßhjÔ  hžhubh¸)”}”(hŒˆChannels allocated by previous test runs are automatically freed when a new
channel is requested after completing a successful test run.”h]”hŒˆChannels allocated by previous test runs are automatically freed when a new
channel is requested after completing a successful test run.”…””}”(hj  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h KçhjÔ  hžhubeh}”(h]”Œreleasing-channels”ah ]”h"]”Œreleasing channels”ah$]”h&]”uh1h¡hjÊ  hžhhŸh¶h KÙubeh}”(h]”Œ"part-5-handling-channel-allocation”ah ]”h"]”Œ$part 5 - handling channel allocation”ah$]”h&]”uh1h¡hh£hžhhŸh¶h K—ubeh}”(h]”Œdma-test-guide”ah ]”h"]”Œdma test guide”ah$]”h&]”uh1h¡hhhžhhŸh¶h Kubeh}”(h]”h ]”h"]”h$]”h&]”Œsource”h¶uh1hŒcurrent_source”NŒcurrent_line”NŒsettings”Œdocutils.frontend”ŒValues”“”)”}”(h¦NŒ	generator”NŒ	datestamp”NŒsource_link”NŒ
source_url”NŒtoc_backlinks”Œentry”Œfootnote_backlinks”KŒsectnum_xform”KŒstrip_comments”NŒstrip_elements_with_classes”NŒstrip_classes”NŒreport_level”KŒ
halt_level”KŒexit_status_level”KŒdebug”NŒwarning_stream”NŒ	traceback”ˆŒinput_encoding”Œ	utf-8-sig”Œinput_encoding_error_handler”Œstrict”Œoutput_encoding”Œutf-8”Œoutput_encoding_error_handler”jX  Œerror_encoding”Œutf-8”Œerror_encoding_error_handler”Œbackslashreplace”Œlanguage_code”Œen”Œrecord_dependencies”NŒconfig”NŒ	id_prefix”hŒauto_id_prefix”Œid”Œdump_settings”NŒdump_internals”NŒdump_transforms”NŒdump_pseudo_xml”NŒexpose_internals”NŒstrict_visitor”NŒ_disable_config”NŒ_source”h¶Œ_destination”NŒ_config_files”]”Œ7/var/lib/git/docbuild/linux/Documentation/docutils.conf”aŒfile_insertion_enabled”ˆŒraw_enabled”KŒline_length_limit”M'Œpep_references”NŒpep_base_url”Œhttps://peps.python.org/”Œpep_file_url_template”Œpep-%04d”Œrfc_references”NŒrfc_base_url”Œ&https://datatracker.ietf.org/doc/html/”Œ	tab_width”KŒtrim_footnote_reference_space”‰Œsyntax_highlight”Œlong”Œsmart_quotes”ˆŒsmartquotes_locales”]”Œcharacter_level_inline_markup”‰Œdoctitle_xform”‰Œdocinfo_xform”KŒsectsubtitle_xform”‰Œimage_loading”Œlink”Œembed_stylesheet”‰Œcloak_email_addresses”ˆŒsection_self_link”‰Œenv”NubŒreporter”NŒindirect_targets”]”Œsubstitution_defs”}”Œsubstitution_names”}”Œrefnames”}”Œ*part 2 - when dmatest is built as a module”]”j  asŒrefids”}”Œnameids”}”(j2  j/  j™  j–  jä  já  j>  j;  jÇ  jÄ  j*  j'  jÑ  jÎ  j"  j  uŒ	nametypes”}”(j2  ‰j™  ‰jä  ‰j>  ‰jÇ  ‰j*  ‰jÑ  ‰j"  ‰uh}”(j/  h£j–  jM  já  jœ  j;  jè  jÄ  jA  j'  jÊ  jÎ  jÛ  j  jÔ  uŒfootnote_refs”}”Œcitation_refs”}”Œautofootnotes”]”Œautofootnote_refs”]”Œsymbol_footnotes”]”Œsymbol_footnote_refs”]”Œ	footnotes”]”Œ	citations”]”Œautofootnote_start”KŒsymbol_footnote_start”K Œ
id_counter”Œcollections”ŒCounter”“”}”…”R”Œparse_messages”]”Œtransform_messages”]”Œtransformer”NŒinclude_log”]”Œ
decoration”Nhžhub.