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tests/gem_reset_stats : mask off ring_stop bits

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Function check_gpu_ok checks to make sure that any hangs
have cleared by testing for (flags == 0). Some tests set
the STOP_RINGS_ALLOW_BAN and STOP_RINGS_ALLOW_ERRORS flags
but these do not get cleared by an individual ring reset,
(a feature added recently to the driver), leading the
check_gpu_ok function to think that the gpu is still hung.

So I mask the flags with STOP_RING_ALL, to ignore the mode
bits and look only at the bits that stop the rings.

Once gpu_check_ok sees that the gpu is not hung I write 0
to stop_rings in order to clear it completely. This is
because igt_set_stop_rings will only write to stop_rings
if either a) they are currently 0 or b) we are writing 0.
If we leave the mode bits set then subsequent calls to
igt_set_stop_rings to create hangs will fail.

Signed-off-by: Tim Gore <tim.gore@intel.com>
This commit is contained in:
Tim Gore 2015-06-03 09:20:21 +01:00 committed by Chris Wilson
parent a5a6d40ca8
commit c221e09420
1 changed files with 7 additions and 1 deletions
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8
tests/gem_reset_stats.c
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@ -1033,7 +1033,7 @@ static void check_gpu_ok(void)
igt_debug("checking gpu state\n");
while (retry_count--) {
flags = igt_get_stop_rings();
flags = igt_get_stop_rings() & STOP_RING_ALL;
if (flags == 0)
break;
@ -1043,6 +1043,12 @@ static void check_gpu_ok(void)
igt_assert(flags == 0);
/*
* Clear the _ALLOW_ERRORS and _ALLOW_BAN flags;
* these are not cleared by individual ring reset.
*/
igt_set_stop_rings(0);
fd = drm_open_any();
gem_quiescent_gpu(fd);
close(fd);