[PATCH] drm/amdgpu:fix exclusive mode game texture blank(v2)

[Christian König]

NAK, please stop adding workarounds like this into common code.

If we need to add the extra NOPs between each command submission than 
just do this in one of the existing IP specific callbacks.

Additional to that this sounds more and more like the removal of the 
double sync wasn't such a good idea.

Christian.

Am 30.09.2016 um 07:00 schrieb Monk Liu:
> this fix DOTA and other exclusive & full screen game
> textrue blank bug, the root cause is that when no ctx
> switch between two DMAframe, CE go too faster and step
> to the next DMAframe, thus DE and CE are not working on
> the same DAMframe.
>
> Change-Id: I92714a1d434bb05e94220a2db9b4a6113b0c2efc
> Signed-off-by: Monk Liu <Monk.Liu at amd.com>
> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c | 7 +++++++
>   1 file changed, 7 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c
> index 38261a0..4863426 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c
> @@ -129,6 +129,7 @@ int amdgpu_ib_schedule(struct amdgpu_ring *ring, unsigned num_ibs,
>   
>   	unsigned i;
>   	int r = 0;
> +	unsigned extra_nop = 0;
>   
>   	if (num_ibs == 0)
>   		return -EINVAL;
> @@ -155,6 +156,10 @@ int amdgpu_ib_schedule(struct amdgpu_ring *ring, unsigned num_ibs,
>   	alloc_size = amdgpu_ring_get_dma_frame_size(ring) +
>   		num_ibs * amdgpu_ring_get_emit_ib_size(ring);
>   
> +	if (job && !job->vm_needs_flush && ring->type == AMDGPU_RING_TYPE_GFX) {
> +		extra_nop = 128;
> +	}
> +
>   	r = amdgpu_ring_alloc(ring, alloc_size);
>   	if (r) {
>   		dev_err(adev->dev, "scheduling IB failed (%d).\n", r);
> @@ -165,6 +170,8 @@ int amdgpu_ib_schedule(struct amdgpu_ring *ring, unsigned num_ibs,
>   		patch_offset = amdgpu_ring_init_cond_exec(ring);
>   
>   	if (vm) {
> +		amdgpu_ring_insert_nop(ring, extra_nop); /* prevent CE go too fast than DE */
> +
>   		r = amdgpu_vm_flush(ring, job);
>   		if (r) {
>   			amdgpu_ring_undo(ring);