linux-kernel - Re: [PATCH 5.10 384/390] Revert "drm/amdgpu: move nbio sdma_doorbell

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Date:   Tue, 25 Oct 2022 11:02:33 +0200
From:   Salvatore Bonaccorso <carnil@...ian.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Shuah Khan <skhan@...uxfoundation.org>,
        "Deucher, Alexander" <Alexander.Deucher@....com>
Subject: Re: [PATCH 5.10 384/390] Revert "drm/amdgpu: move nbio
 sdma_doorbell_range() into sdma code for vega"

Hi Greg,

On Mon, Oct 24, 2022 at 01:33:01PM +0200, Greg Kroah-Hartman wrote:
> From: Shuah Khan <skhan@...uxfoundation.org>
> 
> This reverts commit 9f55f36f749a7608eeef57d7d72991a9bd557341 which is
> commit e3163bc8ffdfdb405e10530b140135b2ee487f89 upstream.
> 
> This commit causes repeated WARN_ONs from
> 
> drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amd
> gpu_dm.c:7391 amdgpu_dm_atomic_commit_tail+0x23b9/0x2430 [amdgpu]
> 
> dmesg fills up with the following messages and drm initialization takes
> a very long time.
> 
> Cc: <stable@...r.kernel.org>    # 5.10
> Signed-off-by: Shuah Khan <skhan@...uxfoundation.org>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> ---
>  drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c |    5 -----
>  drivers/gpu/drm/amd/amdgpu/soc15.c     |   25 +++++++++++++++++++++++++
>  2 files changed, 25 insertions(+), 5 deletions(-)
> 
> --- a/drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c
> @@ -1475,11 +1475,6 @@ static int sdma_v4_0_start(struct amdgpu
>  		WREG32_SDMA(i, mmSDMA0_CNTL, temp);
>  
>  		if (!amdgpu_sriov_vf(adev)) {
> -			ring = &adev->sdma.instance[i].ring;
> -			adev->nbio.funcs->sdma_doorbell_range(adev, i,
> -				ring->use_doorbell, ring->doorbell_index,
> -				adev->doorbell_index.sdma_doorbell_range);
> -
>  			/* unhalt engine */
>  			temp = RREG32_SDMA(i, mmSDMA0_F32_CNTL);
>  			temp = REG_SET_FIELD(temp, SDMA0_F32_CNTL, HALT, 0);
> --- a/drivers/gpu/drm/amd/amdgpu/soc15.c
> +++ b/drivers/gpu/drm/amd/amdgpu/soc15.c
> @@ -1332,6 +1332,25 @@ static int soc15_common_sw_fini(void *ha
>  	return 0;
>  }
>  
> +static void soc15_doorbell_range_init(struct amdgpu_device *adev)
> +{
> +	int i;
> +	struct amdgpu_ring *ring;
> +
> +	/* sdma/ih doorbell range are programed by hypervisor */
> +	if (!amdgpu_sriov_vf(adev)) {
> +		for (i = 0; i < adev->sdma.num_instances; i++) {
> +			ring = &adev->sdma.instance[i].ring;
> +			adev->nbio.funcs->sdma_doorbell_range(adev, i,
> +				ring->use_doorbell, ring->doorbell_index,
> +				adev->doorbell_index.sdma_doorbell_range);
> +		}
> +
> +		adev->nbio.funcs->ih_doorbell_range(adev, adev->irq.ih.use_doorbell,
> +						adev->irq.ih.doorbell_index);
> +	}
> +}
> +
>  static int soc15_common_hw_init(void *handle)
>  {
>  	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
> @@ -1351,6 +1370,12 @@ static int soc15_common_hw_init(void *ha
>  
>  	/* enable the doorbell aperture */
>  	soc15_enable_doorbell_aperture(adev, true);
> +	/* HW doorbell routing policy: doorbell writing not
> +	 * in SDMA/IH/MM/ACV range will be routed to CP. So
> +	 * we need to init SDMA/IH/MM/ACV doorbell range prior
> +	 * to CP ip block init and ring test.
> +	 */
> +	soc15_doorbell_range_init(adev);
>  
>  	return 0;
>  }

Can you please as well revert 7b0db849ea030a70b8fb9c9afec67c81f955482e
on top?

See https://lore.kernel.org/stable/BL1PR12MB5144F3CC640A18DF0C36E414F72E9@BL1PR12MB5144.namprd12.prod.outlook.com/

Both of these reverts need to be applied to fix regressions which were
reported in https://gitlab.freedesktop.org/drm/amd/-/issues/2216 and
downstream in Debian (https://bugs.debian.org/1022025).

If it is now not anymore possible for 5.10.150 can you pick the revert
for 5.10.151?

Regards,
Salvatore