Quoting Stuart Summers (2019-08-13 18:41:19)
> Replace GEM_BUG_ON with explicit check for render class
> when doing the kernel context switch.
>
> Signed-off-by: Stuart Summers <stuart.summ...@intel.com>
> ---
> drivers/gpu/drm/i915/gt/intel_ringbuffer.c | 4 +---
> 1 file changed, 1 insertion(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/gt/intel_ringbuffer.c
> b/drivers/gpu/drm/i915/gt/intel_ringbuffer.c
> index 409d764f8c6d..04ea9bbb88ce 100644
> --- a/drivers/gpu/drm/i915/gt/intel_ringbuffer.c
> +++ b/drivers/gpu/drm/i915/gt/intel_ringbuffer.c
> @@ -1781,9 +1781,7 @@ static int switch_context(struct i915_request *rq)
> }
> }
>
> - if (rq->hw_context->state) {
> - GEM_BUG_ON(engine->id != RCS0);
> -
> + if (engine->class == RENDER_CLASS && rq->hw_context->state) {
It would come as some surprise for this not to be rcs0. I don't think we
are prepared for that on legacy HW :)
-Chris
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