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Diffstat (limited to 'Documentation/dmatest.txt')
| -rw-r--r-- | Documentation/dmatest.txt | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/Documentation/dmatest.txt b/Documentation/dmatest.txt index 3e17b55a8ba3..d05782b26a2e 100644 --- a/Documentation/dmatest.txt +++ b/Documentation/dmatest.txt @@ -58,3 +58,22 @@ the above section "Part 2 - When dmatest is built as a module..." In both cases the module parameters are used as initial values for the test case. You always could check them at run-time by running % grep -H . /sys/module/dmatest/parameters/* + + Part 4 - Gathering the test results + +The module provides a storage for the test results in the memory. The gathered +data could be used after test is done. + +The special file 'results' in the debugfs represents gathered data of the in +progress test. The messages collected are printed to the kernel log as well. + +Example of output: + % cat /sys/kernel/debug/dmatest/results + 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. + +Note that the buffer comparison is done in the old way, i.e. data is not +collected and just printed out. |