[PATCH] drm/amdgpu/gfx10: re-init clear state buffer after gpu reset

[Christian König]

A baco reset also resets the MC, doesn't it? n this case it would be 
expected that the content of VRAM is corrupted.

Christian.

Am 20.11.19 um 09:45 schrieb Zhang, Hawking:
> Or in another word, we are still not clear when the corruption actually happens, right?
>
> Regards,
> Hawking
> -----Original Message-----
> From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> On Behalf Of Zhang, Hawking
> Sent: 2019年11月20日 16:44
> To: Yuan, Xiaojie <Xiaojie.Yuan at amd.com>; amd-gfx at lists.freedesktop.org
> Cc: Long, Gang <Gang.Long at amd.com>; Xiao, Jack <Jack.Xiao at amd.com>
> Subject: RE: [PATCH] drm/amdgpu/gfx10: re-init clear state buffer after gpu reset
>
> Just make sure I understand you correctly. So until fw team root cause the reason of csb corruption, we keep the workaround in driver, correct?
>
> Regards,
> Hawking
> -----Original Message-----
> From: Yuan, Xiaojie <Xiaojie.Yuan at amd.com>
> Sent: 2019年11月20日 14:47
> To: amd-gfx at lists.freedesktop.org
> Cc: Zhang, Hawking <Hawking.Zhang at amd.com>; Xiao, Jack <Jack.Xiao at amd.com>; Long, Gang <Gang.Long at amd.com>; Yuan, Xiaojie <Xiaojie.Yuan at amd.com>
> Subject: [PATCH] drm/amdgpu/gfx10: re-init clear state buffer after gpu reset
>
> This patch fixes 2nd baco reset failure with gfxoff enabled on navi1x.
>
> clear state buffer (resides in vram) is corrupted after 1st baco reset, upon gfxoff exit, CPF gets garbage header in CSIB and hangs.
>
> Signed-off-by: Xiaojie Yuan <xiaojie.yuan at amd.com>
> ---
>   drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c | 43 ++++++++++++++++++++++----
>   1 file changed, 37 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c
> index 9274bd4b6c68..8e24ea08ca39 100644
> --- a/drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c
> @@ -1789,27 +1789,52 @@ static void gfx_v10_0_enable_gui_idle_interrupt(struct amdgpu_device *adev,
>   	WREG32_SOC15(GC, 0, mmCP_INT_CNTL_RING0, tmp);  }
>   
> -static void gfx_v10_0_init_csb(struct amdgpu_device *adev)
> +static int gfx_v10_0_init_csb(struct amdgpu_device *adev)
>   {
> +	int r;
> +
> +	if (adev->in_gpu_reset) {
> +		r = amdgpu_bo_reserve(adev->gfx.rlc.clear_state_obj, false);
> +		if (r)
> +			return r;
> +
> +		r = amdgpu_bo_kmap(adev->gfx.rlc.clear_state_obj,
> +				   (void **)&adev->gfx.rlc.cs_ptr);
> +		if (!r) {
> +			adev->gfx.rlc.funcs->get_csb_buffer(adev,
> +					adev->gfx.rlc.cs_ptr);
> +			amdgpu_bo_kunmap(adev->gfx.rlc.clear_state_obj);
> +		}
> +
> +		amdgpu_bo_unreserve(adev->gfx.rlc.clear_state_obj);
> +		if (r)
> +			return r;
> +	}
> +
>   	/* csib */
>   	WREG32_SOC15(GC, 0, mmRLC_CSIB_ADDR_HI,
>   		     adev->gfx.rlc.clear_state_gpu_addr >> 32);
>   	WREG32_SOC15(GC, 0, mmRLC_CSIB_ADDR_LO,
>   		     adev->gfx.rlc.clear_state_gpu_addr & 0xfffffffc);
>   	WREG32_SOC15(GC, 0, mmRLC_CSIB_LENGTH, adev->gfx.rlc.clear_state_size);
> +
> +	return 0;
>   }
>   
> -static void gfx_v10_0_init_pg(struct amdgpu_device *adev)
> +static int gfx_v10_0_init_pg(struct amdgpu_device *adev)
>   {
>   	int i;
> +	int r;
>   
> -	gfx_v10_0_init_csb(adev);
> +	r = gfx_v10_0_init_csb(adev);
> +	if (r)
> +		return r;
>   
>   	for (i = 0; i < adev->num_vmhubs; i++)
>   		amdgpu_gmc_flush_gpu_tlb(adev, 0, i, 0);
>   
>   	/* TODO: init power gating */
> -	return;
> +	return 0;
>   }
>   
>   void gfx_v10_0_rlc_stop(struct amdgpu_device *adev) @@ -1911,7 +1936,10 @@ static int gfx_v10_0_rlc_resume(struct amdgpu_device *adev)
>   		r = gfx_v10_0_wait_for_rlc_autoload_complete(adev);
>   		if (r)
>   			return r;
> -		gfx_v10_0_init_pg(adev);
> +
> +		r = gfx_v10_0_init_pg(adev);
> +		if (r)
> +			return r;
>   
>   		/* enable RLC SRM */
>   		gfx_v10_0_rlc_enable_srm(adev);
> @@ -1937,7 +1965,10 @@ static int gfx_v10_0_rlc_resume(struct amdgpu_device *adev)
>   				return r;
>   		}
>   
> -		gfx_v10_0_init_pg(adev);
> +		r = gfx_v10_0_init_pg(adev);
> +		if (r)
> +			return r;
> +
>   		adev->gfx.rlc.funcs->start(adev);
>   
>   		if (adev->firmware.load_type == AMDGPU_FW_LOAD_RLC_BACKDOOR_AUTO) {
> --
> 2.20.1
>
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