Diffstat (limited to 'Documentation/dmatest.txt')
1 files changed, 19 insertions, 0 deletions
diff --git a/Documentation/dmatest.txt b/Documentation/dmatest.txt
index 3e17b55a8ba3..d05782b26a2e 100644
@@ -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,
+Note that the buffer comparison is done in the old way, i.e. data is not
+collected and just printed out.