[PATCH] drm/amdgpu: Disable sdma wptr polling memory for sriov

[Deng, Emily]

Hi all,
     Please ignore this patch, the root cause about the sdma hang introduced by sdma wptr polling
has been found, will submit another patch.

Best Wishes,
Emily Deng

> -----Original Message-----
> From: Emily Deng [mailto:Emily.Deng at amd.com]
> Sent: Tuesday, March 06, 2018 10:15 AM
> To: amd-gfx at lists.freedesktop.org
> Cc: Deng, Emily <Emily.Deng at amd.com>
> Subject: [PATCH] drm/amdgpu: Disable sdma wptr polling memory for sriov
> 
> The sdma wptr polling memory will introduce serious issue sdma hang for
> sriov environment on sdma v3.
> And the sdma wptr polling memory is only to fix the FLR cornner case, the
> issue's probabity is very low.
> 
> Change-Id: I2c447533aac6b16d541f58644d141228dd75dfb3
> Signed-off-by: Emily Deng <Emily.Deng at amd.com>
> ---
>  drivers/gpu/drm/amd/amdgpu/sdma_v3_0.c | 5 +----
>  1 file changed, 1 insertion(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/amdgpu/sdma_v3_0.c
> b/drivers/gpu/drm/amd/amdgpu/sdma_v3_0.c
> index ec885ff..44d7d08 100644
> --- a/drivers/gpu/drm/amd/amdgpu/sdma_v3_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/sdma_v3_0.c
> @@ -716,10 +716,7 @@ static int sdma_v3_0_gfx_resume(struct
> amdgpu_device *adev)
>  		WREG32(mmSDMA0_GFX_RB_WPTR_POLL_ADDR_HI +
> sdma_offsets[i],
>  		       upper_32_bits(wptr_gpu_addr));
>  		wptr_poll_cntl =
> RREG32(mmSDMA0_GFX_RB_WPTR_POLL_CNTL + sdma_offsets[i]);
> -		if (amdgpu_sriov_vf(adev))
> -			wptr_poll_cntl = REG_SET_FIELD(wptr_poll_cntl,
> SDMA0_GFX_RB_WPTR_POLL_CNTL, F32_POLL_ENABLE, 1);
> -		else
> -			wptr_poll_cntl = REG_SET_FIELD(wptr_poll_cntl,
> SDMA0_GFX_RB_WPTR_POLL_CNTL, F32_POLL_ENABLE, 0);
> +		wptr_poll_cntl = REG_SET_FIELD(wptr_poll_cntl,
> +SDMA0_GFX_RB_WPTR_POLL_CNTL, F32_POLL_ENABLE, 0);
>  		WREG32(mmSDMA0_GFX_RB_WPTR_POLL_CNTL +
> sdma_offsets[i], wptr_poll_cntl);
> 
>  		/* enable DMA RB */
> --
> 2.7.4