[PATCH 3/5] drm/amdgpu:fix RB cost calculator

[Christian König]

256dw for the header are probably not enough.

Since we now uses NOPs for the CE/DE sync we only need 256dw for that 
alone. I suggest to raise that to 512.

Christian.

Am 15.09.2016 um 00:24 schrieb Andy Furniss:
> This has just gone into drm-next-4.9-wip and caused lots of logging 
> noise.
>
> Seems to work OK though.
>
> Sep 14 23:18:38 ph4 kernel: [drm:gfx_v8_0_ring_emit_fence_gfx 
> [amdgpu]] *ERROR* amdgpu: writing more dwords to the ring than expected!
> Sep 14 23:18:38 ph4 last message repeated 11 times
> Sep 14 23:18:38 ph4 kernel: [drm:gfx_v8_ring_emit_sb [amdgpu]] *ERROR* 
> amdgpu: writing more dwords to the ring than expected!
> Sep 14 23:18:38 ph4 kernel: [drm:gfx_v8_ring_emit_sb [amdgpu]] *ERROR* 
> amdgpu: writing more dwords to the ring than expected!
> Sep 14 23:18:38 ph4 kernel: [drm:amdgpu_ring_insert_nop [amdgpu]] 
> *ERROR* amdgpu: writing more dwords to the ring than expected!
> Sep 14 23:18:38 ph4 last message repeated 10 times
> Sep 14 23:18:38 ph4 kernel: [drm:gfx_v8_0_ring_emit_ib_gfx [amdgpu]] 
> *ERROR* amdgpu: writing more dwords to the ring than expected!
> Sep 14 23:18:38 ph4 kernel: [drm:gfx_v8_0_ring_emit_ib_gfx [amdgpu]] 
> *ERROR* amdgpu: writing more dwords to the ring than expected!
> Sep 14 23:18:38 ph4 kernel: [drm:gfx_v8_0_ring_emit_hdp_invalidate 
> [amdgpu]] *ERROR* amdgpu: writing more dwords to the ring than expected!
> Sep 14 23:18:38 ph4 last message repeated 4 times
> Sep 14 23:18:38 ph4 kernel: [drm:gfx_v8_0_ring_emit_fence_gfx 
> [amdgpu]] *ERROR* amdgpu: writing more dwords to the ring than expected!
> Sep 14 23:18:38 ph4 last message repeated 11 times
> Sep 14 23:18:38 ph4 kernel: [drm:gfx_v8_ring_emit_sb [amdgpu]] *ERROR* 
> amdgpu: writing more dwords to the ring than expected!
> Sep 14 23:18:38 ph4 kernel: [drm:gfx_v8_ring_emit_sb [amdgpu]] *ERROR* 
> amdgpu: writing more dwords to the ring than expected!
> Sep 14 23:18:38 ph4 kernel: [drm:amdgpu_ring_insert_nop [amdgpu]] 
> *ERROR* amdgpu: writing more dwords to the ring than expected!
> Sep 14 23:18:38 ph4 last message repeated 10 times
>
> Monk Liu wrote:
>> Change-Id: Ie3e4587ed49c487c562f45a99f236a76727ace1e
>> Signed-off-by: Monk Liu <Monk.Liu at amd.com>
>> ---
>>   drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c 
>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c
>> index 029ee79..6ad45fa 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c
>> @@ -151,7 +151,7 @@ int amdgpu_ib_schedule(struct amdgpu_ring *ring, 
>> unsigned num_ibs,
>>           return -EINVAL;
>>       }
>>
>> -    r = amdgpu_ring_alloc(ring, 256 * num_ibs);
>> +    r = amdgpu_ring_alloc(ring, 256 + (num_ibs << 4));
>>       if (r) {
>>           dev_err(adev->dev, "scheduling IB failed (%d).\n", r);
>>           return r;
>>
>
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