[RFC PATCH 09/13] drm/amdgpu: make IP block state machine works in stack like way

[Mario Limonciello]

On 1/8/2025 08:00, Jiang Liu wrote:
> There are some mismatch between IP block state machine and its associated
> status flags, especially about the meaning of `status.late_initialized`.
> So let's make the state machine and associated status flas work in stack-like

s/flas/flag/

> way as below:
> Callback	Status
> early_init:	valid = true
> sw_init: 	sw = true
> hw_init:	hw = true
> late_init:	late_initialized = true
> early_fini:	late_initialized = false
> hw_fini:	hw = false
> sw_fini:	sw = false
> late_fini:	valid = false

Would you mind also putting this into kerneldoc?  I think it would be 
really helpful for others to be able to follow in the future why there 
are so many variables and what they all mean.

> 
> Signed-off-by: Jiang Liu <gerry at linux.alibaba.com>
> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 7 ++++---
>   1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> index 0e69c7c7fe1f..36a33a391411 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> @@ -3332,6 +3332,8 @@ static int amdgpu_device_ip_fini_early(struct amdgpu_device *adev)
>   			DRM_DEBUG("early_fini of IP block <%s> failed %d\n",
>   				  adev->ip_blocks[i].version->funcs->name, r);
>   		}
> +
> +		adev->ip_blocks[i].status.late_initialized = false;
>   	}
>   
>   	amdgpu_device_set_pg_state(adev, AMD_PG_STATE_UNGATE);
> @@ -3407,15 +3409,14 @@ static int amdgpu_device_ip_fini(struct amdgpu_device *adev)
>   				  adev->ip_blocks[i].version->funcs->name, r);
>   		}
>   		adev->ip_blocks[i].status.sw = false;
> -		adev->ip_blocks[i].status.valid = false;
>   	}
>   
>   	for (i = adev->num_ip_blocks - 1; i >= 0; i--) {
> -		if (!adev->ip_blocks[i].status.late_initialized)
> +		if (!adev->ip_blocks[i].status.valid)
>   			continue;
>   		if (adev->ip_blocks[i].version->funcs->late_fini)
>   			adev->ip_blocks[i].version->funcs->late_fini(&adev->ip_blocks[i]);
> -		adev->ip_blocks[i].status.late_initialized = false;
> +		adev->ip_blocks[i].status.valid = false;
>   	}
>   
>   	amdgpu_ras_fini(adev);