[Bug 107545] radeon - ring 0 stalled - GPU lockup - SI

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Fri Aug 24 23:34:53 UTC 2018


https://bugs.freedesktop.org/show_bug.cgi?id=107545

--- Comment #11 from Julien Isorce <julien.isorce at gmail.com> ---
I found time to go a bit further. Now I understand this radeon_cs_parser_init
function a bit more 

If I comment the AGP condition here
https://cgit.freedesktop.org/~agd5f/linux/tree/drivers/gpu/drm/radeon/radeon_cs.c?h=amd-staging-drm-next#n340
so that kdata is used then I can verify that the kdata contains the same data
as user space.

But when writing to parser->ib.ptr here
https://cgit.freedesktop.org/~agd5f/linux/tree/drivers/gpu/drm/radeon/radeon_cs.c?h=amd-staging-drm-next#n648
then comparing parser->ib.ptr's data and kdata shows the same difference as
pointed in comment #5.

Could it be an issue with pcie (though is works with admgpu, well in fact it
uses kdata on amdgpu) ? Is there anyway I can force a commit/flush just after
it writes to parser->ib.ptr as a test even if it is slower ? thx!

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