[V2,0/5] dmaengine: dmatest: Add multi chan and new params

Message

Seraj Alijan Aug. 31, 2018, 11:03 a.m. UTC

This patch set improves the dmatest module by adding multi channel
testing capabilities and new parameters to allow more explicit control
of the test functionality.
Multi channel testing is added by the first patch to improve the process
of testing DMA devices with multiple channels as the current driver
limits testing to one specified channel per test run. The second patch
improves iops results reported by the test for operations that last for
more than one second as the test currently reports an incorrect 0 iops
for long operations. The third patch adds a new property that allows
configuration of address alignment from user space, and the fourth patch
adds the ability to specify test transfer size without relying on a
randomly generated transfer size.
The fifth patch updates the API documentation to reflect the new
changes.

V2:
 Use do_div() instead of DIV_ROUND_CLOSEST for division, otherwise the
 module will reference __udivdi3 which is not present in 32-bit kernel and
 cause the following error:

 drivers/dma/dmatest.o: In function `dmatest_persec':
 >> drivers/dma/dmatest.c:457: undefined reference to `__udivdi3'
 >> drivers/dma/dmatest.c:457: undefined reference to `__udivdi3'
 >> drivers/dma/dmatest.c:457: undefined reference to `__udivdi3'


Seraj Alijan (5):
  dmaengine: dmatest: Add support for multi channel testing
  dmaengine: dmatest: Use fixed point div to calculate iops
  dmaengine: dmatest: Add alignment parameter
  dmaengine: dmatest: Add transfer_size parameter
  dmaengine: Documentation: Add documentation for multi chan testing

 Documentation/driver-api/dmaengine/dmatest.rst |  27 +++-
 drivers/dma/dmatest.c                          | 172 ++++++++++++++++++++-----
 2 files changed, 160 insertions(+), 39 deletions(-)