[Intel-gfx] [PATCH] drm/i915: Specify bsd rings through exec flag

[Daniel Vetter]

On Wed, Aug 6, 2014 at 3:32 AM, Zhao, Yakui <yakui.zhao at intel.com> wrote:
>     >After the GPU hang occurs on BSD ring during decoding, it needs to
> specify the corresponding BSD ring to read the decoding status registers
> related with the BSD ring.
>
>       Can this be regarded as one open-source usage scenario?

Sure, but I'm not sure whether this is the correct way to do this - if
some other libva client does an execbuf in-between couldn't these
register get overwritten? It sounds like the kernel should capture
these registers for userspace in a race-free way and then provide them
with maybe an extension to the reset-stats ioctl?

I definitely want to see how this is used in libva before signing up
for a new kernel interface.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch