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

[Liu, Monk]

What's your suggestion,

The thing is that when no vm_flush() needed we also have no 128dw nop inserted so the CE goes to fast to the next CS, since CE already dealing with SWITCH_BUFFERs, so CE and DE work in the different buffer and lead to corruption 
The fix for it is that with or without VM_FLUSH, we always need that 128dw nop inserted in head of each DMAframe , (windows use padding so it always have 128dw nop after each SWITCH_BUFFERS)

BR Monk

-----Original Message-----
From: amd-gfx [mailto:amd-gfx-bounces at lists.freedesktop.org] On Behalf Of Christian K?nig
Sent: Friday, September 30, 2016 5:07 PM
To: Liu, Monk <Monk.Liu at amd.com>; amd-gfx at lists.freedesktop.org
Subject: Re: [PATCH] drm/amdgpu:fix exclusive mode game texture blank(v2)

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);


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