€•ìsŒsphinx.addnodes”Œdocument”“”)”}”(Œ rawsource”Œ”Œchildren”]”(Œ translations”Œ LanguagesNode”“”)”}”(hhh]”(hŒ pending_xref”“”)”}”(hhh]”Œdocutils.nodes”ŒText”“”ŒChinese (Simplified)”…””}”Œparent”hsbaŒ attributes”}”(Œids”]”Œclasses”]”Œnames”]”Œdupnames”]”Œbackrefs”]”Œ refdomain”Œstd”Œreftype”Œdoc”Œ reftarget”Œ0/translations/zh_CN/driver-api/dmaengine/dmatest”Œmodname”NŒ classname”NŒ refexplicit”ˆuŒtagname”hhh ubh)”}”(hhh]”hŒChinese (Traditional)”…””}”hh2sbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ0/translations/zh_TW/driver-api/dmaengine/dmatest”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubh)”}”(hhh]”hŒItalian”…””}”hhFsbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ0/translations/it_IT/driver-api/dmaengine/dmatest”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubh)”}”(hhh]”hŒJapanese”…””}”hhZsbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ0/translations/ja_JP/driver-api/dmaengine/dmatest”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubh)”}”(hhh]”hŒKorean”…””}”hhnsbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ0/translations/ko_KR/driver-api/dmaengine/dmatest”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubh)”}”(hhh]”hŒPortuguese (Brazilian)”…””}”hh‚sbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ0/translations/pt_BR/driver-api/dmaengine/dmatest”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubh)”}”(hhh]”hŒSpanish”…””}”hh–sbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ0/translations/sp_SP/driver-api/dmaengine/dmatest”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubeh}”(h]”h ]”h"]”h$]”h&]”Œcurrent_language”ŒEnglish”uh1h hhŒ _document”hŒsource”NŒline”NubhŒsection”“”)”}”(hhh]”(hŒtitle”“”)”}”(hŒDMA Test Guide”h]”hŒDMA Test Guide”…””}”(hh¼h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hºhh·h²hh³ŒJ/var/lib/git/docbuild/linux/Documentation/driver-api/dmaengine/dmatest.rst”h´KubhŒ paragraph”“”)”}”(hŒ3Andy Shevchenko ”h]”(hŒAndy Shevchenko <”…””}”(hhÍh²hh³Nh´NubhŒ reference”“”)”}”(hŒ!andriy.shevchenko@linux.intel.com”h]”hŒ!andriy.shevchenko@linux.intel.com”…””}”(hh×h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”Œrefuri”Œ(mailto:andriy.shevchenko@linux.intel.com”uh1hÕhhÍubhŒ>”…””}”(hhÍh²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´Khh·h²hubhÌ)”}”(hŒLThis small document introduces how to test DMA drivers using dmatest module.”h]”hŒLThis small document introduces how to test DMA drivers using dmatest module.”…””}”(hhñh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´Khh·h²hubhÌ)”}”(hXˆThe dmatest module tests DMA memcpy, memset, XOR and RAID6 P+Q operations using various lengths and various offsets into the source and destination buffers. It will initialize both buffers with a repeatable pattern and verify that the DMA engine copies the requested region and nothing more. It will also verify that the bytes aren't swapped around, and that the source buffer isn't modified.”h]”hXŒThe dmatest module tests DMA memcpy, memset, XOR and RAID6 P+Q operations using various lengths and various offsets into the source and destination buffers. It will initialize both buffers with a repeatable pattern and verify that the DMA engine copies the requested region and nothing more. It will also verify that the bytes aren’t swapped around, and that the source buffer isn’t modified.”…””}”(hhÿh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´K hh·h²hubhÌ)”}”(hŒ·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]”hŒ·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.”…””}”(hj h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´Khh·h²hubhŒnote”“”)”}”(hŒÎThe test suite works only on the channels that have at least one capability of the following: DMA_MEMCPY (memory-to-memory), DMA_MEMSET (const-to-memory or memory-to-memory, when emulated), DMA_XOR, DMA_PQ.”h]”hÌ)”}”(hŒÎThe test suite works only on the channels that have at least one capability of the following: DMA_MEMCPY (memory-to-memory), DMA_MEMSET (const-to-memory or memory-to-memory, when emulated), DMA_XOR, DMA_PQ.”h]”hŒÎThe test suite works only on the channels that have at least one capability of the following: DMA_MEMCPY (memory-to-memory), DMA_MEMSET (const-to-memory or memory-to-memory, when emulated), DMA_XOR, DMA_PQ.”…””}”(hj!h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´Khjubah}”(h]”h ]”h"]”h$]”h&]”uh1jhh·h²hh³hÊh´Nubj)”}”(hŒYIn case of any related questions use the official mailing list dmaengine@vger.kernel.org.”h]”hÌ)”}”(hŒYIn case of any related questions use the official mailing list dmaengine@vger.kernel.org.”h]”(hŒ?In case of any related questions use the official mailing list ”…””}”(hj9h²hh³Nh´NubhÖ)”}”(hŒdmaengine@vger.kernel.org”h]”hŒdmaengine@vger.kernel.org”…””}”(hjAh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”Œrefuri”Œ mailto:dmaengine@vger.kernel.org”uh1hÕhj9ubhŒ.”…””}”(hj9h²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´Khj5ubah}”(h]”h ]”h"]”h$]”h&]”uh1jhh·h²hh³hÊh´Nubh¶)”}”(hhh]”(h»)”}”(hŒ%Part 1 - How to build the test module”h]”hŒ%Part 1 - How to build the test module”…””}”(hjdh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hºhjah²hh³hÊh´KubhÌ)”}”(hŒHThe menuconfig contains an option that could be found by following path:”h]”hŒHThe menuconfig contains an option that could be found by following path:”…””}”(hjrh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´Khjah²hubhŒ block_quote”“”)”}”(hŒ8Device Drivers -> DMA Engine support -> DMA Test client ”h]”hÌ)”}”(hŒ7Device Drivers -> DMA Engine support -> DMA Test client”h]”hŒ7Device Drivers -> DMA Engine support -> DMA Test client”…””}”(hj†h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´K!hj‚ubah}”(h]”h ]”h"]”h$]”h&]”uh1j€h³hÊh´K!hjah²hubhÌ)”}”(hŒŽIn the configuration file the option called CONFIG_DMATEST. The dmatest could be built as module or inside kernel. Let's consider those cases.”h]”hŒIn the configuration file the option called CONFIG_DMATEST. The dmatest could be built as module or inside kernel. Let’s consider those cases.”…””}”(hjšh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´K#hjah²hubeh}”(h]”Œ#part-1-how-to-build-the-test-module”ah ]”h"]”Œ%part 1 - how to build the test module”ah$]”h&]”uh1hµhh·h²hh³hÊh´Kubh¶)”}”(hhh]”(h»)”}”(hŒ*Part 2 - When dmatest is built as a module”h]”hŒ*Part 2 - When dmatest is built as a module”…””}”(hj³h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hºhj°h²hh³hÊh´K'ubhÌ)”}”(hŒExample of usage::”h]”hŒExample of usage:”…””}”(hjÁh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´K)hj°h²hubhŒ literal_block”“”)”}”(hŒD% modprobe dmatest timeout=2000 iterations=1 channel=dma0chan0 run=1”h]”hŒD% modprobe dmatest timeout=2000 iterations=1 channel=dma0chan0 run=1”…””}”hjÑsbah}”(h]”h ]”h"]”h$]”h&]”Œ xml:space”Œpreserve”uh1jÏh³hÊh´K+hj°h²hubhÌ)”}”(hŒ...or::”h]”hŒ...or:”…””}”(hjáh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´K-hj°h²hubjÐ)”}”(hŒä% 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]”hŒä% 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”…””}”hjïsbah}”(h]”h ]”h"]”h$]”h&]”jßjàuh1jÏh³hÊh´K/hj°h²hubhÌ)”}”(hŒ"...or on the kernel command line::”h]”hŒ!...or on the kernel command line:”…””}”(hjýh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´K5hj°h²hubjÐ)”}”(hŒQdmatest.timeout=2000 dmatest.iterations=1 dmatest.channel=dma0chan0 dmatest.run=1”h]”hŒQdmatest.timeout=2000 dmatest.iterations=1 dmatest.channel=dma0chan0 dmatest.run=1”…””}”hj sbah}”(h]”h ]”h"]”h$]”h&]”jßjàuh1jÏh³hÊh´K7hj°h²hubhÌ)”}”(hŒ=Example of multi-channel test usage (new in the 5.0 kernel)::”h]”hŒ /sys/module/dmatest/parameters/timeout % echo 1 > /sys/module/dmatest/parameters/iterations % echo dma0chan0 > /sys/module/dmatest/parameters/channel % echo dma0chan1 > /sys/module/dmatest/parameters/channel % echo dma0chan2 > /sys/module/dmatest/parameters/channel % echo 1 > /sys/module/dmatest/parameters/run”h]”hXX% modprobe dmatest % echo 2000 > /sys/module/dmatest/parameters/timeout % echo 1 > /sys/module/dmatest/parameters/iterations % echo dma0chan0 > /sys/module/dmatest/parameters/channel % echo dma0chan1 > /sys/module/dmatest/parameters/channel % echo dma0chan2 > /sys/module/dmatest/parameters/channel % echo 1 > /sys/module/dmatest/parameters/run”…””}”hj'sbah}”(h]”h ]”h"]”h$]”h&]”jßjàuh1jÏh³hÊh´K;hj°h²hubj)”}”(hX5For 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]”hÌ)”}”(hX5For 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]”hX5For 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.”…””}”(hj9h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´KDhj5ubah}”(h]”h ]”h"]”h$]”h&]”uh1jhj°h²hh³hÊh´NubhŒhint”“”)”}”(hŒgA list of available channels can be found by running the following command:: % ls -1 /sys/class/dma/”h]”(hÌ)”}”(hŒLA list of available channels can be found by running the following command::”h]”hŒKA list of available channels can be found by running the following command:”…””}”(hjSh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´KNhjOubjÐ)”}”(hŒ% ls -1 /sys/class/dma/”h]”hŒ% ls -1 /sys/class/dma/”…””}”hjasbah}”(h]”h ]”h"]”h$]”h&]”jßjàuh1jÏh³hÊh´KPhjOubeh}”(h]”h ]”h"]”h$]”h&]”uh1jMhj°h²hh³hÊh´NubhÌ)”}”(hŒÅOnce started a message like " dmatest: Added 1 threads using dma0chan0" is emitted. A thread for that specific channel is created and is now pending, the pending thread is started once run is to 1.”h]”hŒÉOnce started a message like “ dmatest: Added 1 threads using dma0chan0†is emitted. A thread for that specific channel is created and is now pending, the pending thread is started once run is to 1.”…””}”(hjuh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´KRhj°h²hubhÌ)”}”(hŒ@Note that running a new test will not stop any in progress test.”h]”hŒ@Note that running a new test will not stop any in progress test.”…””}”(hjƒh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´KVhj°h²hubhÌ)”}”(hŒ7The following command returns the state of the test. ::”h]”hŒ4The following command returns the state of the test.”…””}”(hj‘h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´KXhj°h²hubjÐ)”}”(hŒ(% cat /sys/module/dmatest/parameters/run”h]”hŒ(% cat /sys/module/dmatest/parameters/run”…””}”hjŸsbah}”(h]”h ]”h"]”h$]”h&]”jßjàuh1jÏh³hÊh´KZhj°h²hubhÌ)”}”(hXÙTo wait for test completion userspace can poll 'run' until it is false, or use the wait parameter. Specifying 'wait=1' when loading the module causes module initialization to pause until a test run has completed, while reading /sys/module/dmatest/parameters/wait waits for any running test to complete before returning. For example, the following scripts wait for 42 tests to complete before exiting. Note that if 'iterations' is set to 'infinite' then waiting is disabled.”h]”hXéTo wait for test completion userspace can poll ‘run’ until it is false, or use the wait parameter. Specifying ‘wait=1’ when loading the module causes module initialization to pause until a test run has completed, while reading /sys/module/dmatest/parameters/wait waits for any running test to complete before returning. For example, the following scripts wait for 42 tests to complete before exiting. Note that if ‘iterations’ is set to ‘infinite’ then waiting is disabled.”…””}”(hj­h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´K\hj°h²hubhÌ)”}”(hŒ Example::”h]”hŒExample:”…””}”(hj»h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´Kdhj°h²hubjÐ)”}”(hŒC% modprobe dmatest run=1 iterations=42 wait=1 % modprobe -r dmatest”h]”hŒC% modprobe dmatest run=1 iterations=42 wait=1 % modprobe -r dmatest”…””}”hjÉsbah}”(h]”h ]”h"]”h$]”h&]”jßjàuh1jÏh³hÊh´Kfhj°h²hubhÌ)”}”(hŒ...or::”h]”hŒ...or:”…””}”(hj×h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´Kihj°h²hubjÐ)”}”(hŒf% modprobe dmatest run=1 iterations=42 % cat /sys/module/dmatest/parameters/wait % modprobe -r dmatest”h]”hŒf% modprobe dmatest run=1 iterations=42 % cat /sys/module/dmatest/parameters/wait % modprobe -r dmatest”…””}”hjåsbah}”(h]”h ]”h"]”h$]”h&]”jßjàuh1jÏh³hÊh´Kkhj°h²hubeh}”(h]”Œ(part-2-when-dmatest-is-built-as-a-module”ah ]”h"]”Œ*part 2 - when dmatest is built as a module”ah$]”h&]”uh1hµhh·h²hh³hÊh´K'Œ referenced”Kubh¶)”}”(hhh]”(h»)”}”(hŒ$Part 3 - When built-in in the kernel”h]”hŒ$Part 3 - When built-in in the kernel”…””}”(hjÿh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hºhjüh²hh³hÊh´KpubhÌ)”}”(hXThe 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]”(hŒîThe 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 ”…””}”(hj h²hh³Nh´NubhÖ)”}”(hŒ-`Part 2 - When dmatest is built as a module`_”h]”hŒ*Part 2 - When dmatest is built as a module”…””}”(hjh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”Œname”Œ*Part 2 - When dmatest is built as a module”Œrefid”jõuh1hÕhj Œresolved”KubhŒ.”…””}”(hj h²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´Krhjüh²hubhÌ)”}”(hŒŠIn 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]”hŒ‡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”…””}”(hj1h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´Kwhjüh²hubjÐ)”}”(hŒ,% grep -H . /sys/module/dmatest/parameters/*”h]”hŒ,% grep -H . /sys/module/dmatest/parameters/*”…””}”hj?sbah}”(h]”h ]”h"]”h$]”h&]”jßjàuh1jÏh³hÊh´Kzhjüh²hubeh}”(h]”Œ"part-3-when-built-in-in-the-kernel”ah ]”h"]”Œ$part 3 - when built-in in the kernel”ah$]”h&]”uh1hµhh·h²hh³hÊh´Kpubh¶)”}”(hhh]”(h»)”}”(hŒ#Part 4 - Gathering the test results”h]”hŒ#Part 4 - Gathering the test results”…””}”(hjXh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hºhjUh²hh³hÊh´K}ubhÌ)”}”(hŒCTest results are printed to the kernel log buffer with the format::”h]”hŒBTest results are printed to the kernel log buffer with the format:”…””}”(hjfh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´KhjUh²hubjÐ)”}”(hŒm"dmatest: result : : '' with src_off= dst_off= len= ()"”h]”hŒm"dmatest: result : : '' with src_off= dst_off= len= ()"”…””}”hjtsbah}”(h]”h ]”h"]”h$]”h&]”jßjàuh1jÏh³hÊh´KhjUh²hubhÌ)”}”(hŒExample of output::”h]”hŒExample of output:”…””}”(hj‚h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´KƒhjUh²hubjÐ)”}”(hŒr% dmesg | tail -n 1 dmatest: result dma0chan0-copy0: #1: No errors with src_off=0x7bf dst_off=0x8ad len=0x3fea (0)”h]”hŒr% dmesg | tail -n 1 dmatest: result dma0chan0-copy0: #1: No errors with src_off=0x7bf dst_off=0x8ad len=0x3fea (0)”…””}”hjsbah}”(h]”h ]”h"]”h$]”h&]”jßjàuh1jÏh³hÊh´K…hjUh²hubhÌ)”}”(hX0The message format is unified across the different types of errors. A number in the parentheses represents additional information, e.g. error code, error counter, or status. A test thread also emits a summary line at completion listing the number of tests executed, number that failed, and a result code.”h]”hX0The message format is unified across the different types of errors. A number in the parentheses represents additional information, e.g. error code, error counter, or status. A test thread also emits a summary line at completion listing the number of tests executed, number that failed, and a result code.”…””}”(hjžh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´KˆhjUh²hubhÌ)”}”(hŒ Example::”h]”hŒExample:”…””}”(hj¬h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´KŽhjUh²hubjÐ)”}”(hŒb% dmesg | tail -n 1 dmatest: dma0chan0-copy0: summary 1 test, 0 failures 1000 iops 100000 KB/s (0)”h]”hŒb% dmesg | tail -n 1 dmatest: dma0chan0-copy0: summary 1 test, 0 failures 1000 iops 100000 KB/s (0)”…””}”hjºsbah}”(h]”h ]”h"]”h$]”h&]”jßjàuh1jÏh³hÊh´KhjUh²hubhÌ)”}”(hŒ\The details of a data miscompare error are also emitted, but do not follow the above format.”h]”hŒ\The details of a data miscompare error are also emitted, but do not follow the above format.”…””}”(hjÈh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´K“hjUh²hubeh}”(h]”Œ!part-4-gathering-the-test-results”ah ]”h"]”Œ#part 4 - gathering the test results”ah$]”h&]”uh1hµhh·h²hh³hÊh´K}ubh¶)”}”(hhh]”(h»)”}”(hŒ$Part 5 - Handling channel allocation”h]”hŒ$Part 5 - Handling channel allocation”…””}”(hjáh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hºhjÞh²hh³hÊh´K—ubh¶)”}”(hhh]”(h»)”}”(hŒAllocating Channels”h]”hŒAllocating Channels”…””}”(hjòh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hºhjïh²hh³hÊh´KšubhÌ)”}”(hŒ·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]”hŒ·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.”…””}”(hjh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´Kœhjïh²hubhÌ)”}”(hŒ Example::”h]”hŒExample:”…””}”(hjh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´K hjïh²hubjÐ)”}”(hŒ`% echo 1 > /sys/module/dmatest/parameters/run dmatest: No channels configured, continue with any”h]”hŒ`% echo 1 > /sys/module/dmatest/parameters/run dmatest: No channels configured, continue with any”…””}”hjsbah}”(h]”h ]”h"]”h$]”h&]”jßjàuh1jÏh³hÊh´K¢hjïh²hubhÌ)”}”(hŒ¹Channels are registered using the "channel" parameter. Channels can be requested by their name, once requested, the channel is registered and a pending thread is added to the test list.”h]”hŒ½Channels are registered using the “channel†parameter. Channels can be requested by their name, once requested, the channel is registered and a pending thread is added to the test list.”…””}”(hj*h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´K¥hjïh²hubhÌ)”}”(hŒ Example::”h]”hŒExample:”…””}”(hj8h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´K¨hjïh²hubjÐ)”}”(hŒb% echo dma0chan2 > /sys/module/dmatest/parameters/channel dmatest: Added 1 threads using dma0chan2”h]”hŒb% echo dma0chan2 > /sys/module/dmatest/parameters/channel dmatest: Added 1 threads using dma0chan2”…””}”hjFsbah}”(h]”h ]”h"]”h$]”h&]”jßjàuh1jÏh³hÊh´Kªhjïh²hubhÌ)”}”(hŒŸMore 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]”hŒŸMore 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.”…””}”(hjTh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´K­hjïh²hubhÌ)”}”(hŒ Example::”h]”hŒExample:”…””}”(hjbh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´K°hjïh²hubjÐ)”}”(hŒü% 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]”hŒü% 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”…””}”hjpsbah}”(h]”h ]”h"]”h$]”h&]”jßjàuh1jÏh³hÊh´K²hjïh²hubhÌ)”}”(hŒŽAnother method of requesting channels is to request a channel with an empty string, Doing so will request all channels available to be tested:”h]”hŒŽAnother method of requesting channels is to request a channel with an empty string, Doing so will request all channels available to be tested:”…””}”(hj~h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´K¹hjïh²hubhÌ)”}”(hŒ Example::”h]”hŒExample:”…””}”(hjŒh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´K¼hjïh²hubjÐ)”}”(hXQ% echo "" > /sys/module/dmatest/parameters/channel dmatest: Added 1 threads using dma0chan0 dmatest: Added 1 threads using dma0chan3 dmatest: Added 1 threads using dma0chan4 dmatest: Added 1 threads using dma0chan5 dmatest: Added 1 threads using dma0chan6 dmatest: Added 1 threads using dma0chan7 dmatest: Added 1 threads using dma0chan8”h]”hXQ% echo "" > /sys/module/dmatest/parameters/channel dmatest: Added 1 threads using dma0chan0 dmatest: Added 1 threads using dma0chan3 dmatest: Added 1 threads using dma0chan4 dmatest: Added 1 threads using dma0chan5 dmatest: Added 1 threads using dma0chan6 dmatest: Added 1 threads using dma0chan7 dmatest: Added 1 threads using dma0chan8”…””}”hjšsbah}”(h]”h ]”h"]”h$]”h&]”jßjàuh1jÏh³hÊh´K¾hjïh²hubhÌ)”}”(hŒ}At any point during the test configuration, reading the "test_list" parameter will print the list of currently pending tests.”h]”hŒAt any point during the test configuration, reading the “test_list†parameter will print the list of currently pending tests.”…””}”(hj¨h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´KÇhjïh²hubhÌ)”}”(hŒ Example::”h]”hŒExample:”…””}”(hj¶h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´KÊhjïh²hubjÐ)”}”(hX#% 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]”hX#% 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”…””}”hjÄsbah}”(h]”h ]”h"]”h$]”h&]”jßjàuh1jÏh³hÊh´KÌhjïh²hubhÌ)”}”(hŒNote: Channels will have to be configured for each test run as channel configurations do not carry across to the next test run.”h]”hŒNote: Channels will have to be configured for each test run as channel configurations do not carry across to the next test run.”…””}”(hjÒh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´KÕhjïh²hubeh}”(h]”Œallocating-channels”ah ]”h"]”Œallocating channels”ah$]”h&]”uh1hµhjÞh²hh³hÊh´Kšubh¶)”}”(hhh]”(h»)”}”(hŒReleasing Channels”h]”hŒReleasing Channels”…””}”(hjëh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hºhjèh²hh³hÊh´KÙubhÌ)”}”(hŒ*Channels can be freed by setting run to 0.”h]”hŒ*Channels can be freed by setting run to 0.”…””}”(hjùh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´KÛhjèh²hubhÌ)”}”(hŒ Example::”h]”hŒExample:”…””}”(hjh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´KÝhjèh²hubjÐ)”}”(hŒà% 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]”hŒà% 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”…””}”hjsbah}”(h]”h ]”h"]”h$]”h&]”jßjàuh1jÏh³hÊh´Kßhjèh²hubhÌ)”}”(hŒˆChannels allocated by previous test runs are automatically freed when a new channel is requested after completing a successful test run.”h]”hŒˆChannels allocated by previous test runs are automatically freed when a new channel is requested after completing a successful test run.”…””}”(hj#h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hËh³hÊh´Kçhjèh²hubeh}”(h]”Œreleasing-channels”ah ]”h"]”Œreleasing channels”ah$]”h&]”uh1hµhjÞh²hh³hÊh´KÙubeh}”(h]”Œ"part-5-handling-channel-allocation”ah ]”h"]”Œ$part 5 - handling channel allocation”ah$]”h&]”uh1hµhh·h²hh³hÊh´K—ubeh}”(h]”Œdma-test-guide”ah ]”h"]”Œdma test guide”ah$]”h&]”uh1hµhhh²hh³hÊh´Kubeh}”(h]”h ]”h"]”h$]”h&]”Œsource”hÊuh1hŒcurrent_source”NŒ current_line”NŒsettings”Œdocutils.frontend”ŒValues”“”)”}”(hºNŒ generator”NŒ datestamp”NŒ source_link”NŒ source_url”NŒ toc_backlinks”Œentry”Œfootnote_backlinks”KŒ sectnum_xform”KŒstrip_comments”NŒstrip_elements_with_classes”NŒ strip_classes”NŒ report_level”KŒ halt_level”KŒexit_status_level”KŒdebug”NŒwarning_stream”NŒ traceback”ˆŒinput_encoding”Œ utf-8-sig”Œinput_encoding_error_handler”Œstrict”Œoutput_encoding”Œutf-8”Œoutput_encoding_error_handler”jlŒerror_encoding”Œutf-8”Œerror_encoding_error_handler”Œbackslashreplace”Œ language_code”Œen”Œrecord_dependencies”NŒconfig”NŒ id_prefix”hŒauto_id_prefix”Œid”Œ dump_settings”NŒdump_internals”NŒdump_transforms”NŒdump_pseudo_xml”NŒexpose_internals”NŒstrict_visitor”NŒ_disable_config”NŒ_source”hÊŒ _destination”NŒ 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citations”]”Œautofootnote_start”KŒsymbol_footnote_start”KŒ id_counter”Œ collections”ŒCounter”“”}”…”R”Œparse_messages”]”Œtransform_messages”]”Œ transformer”NŒ include_log”]”Œ decoration”Nh²hub.