linux-kernel - Re: [PATCH] drm/amd: Document device reset methods

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Date:   Fri, 10 Nov 2023 14:53:39 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     André Almeida <andrealmeid@...lia.com>,
        dri-devel@...ts.freedesktop.org, amd-gfx@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Cc:     kernel-dev@...lia.com, alexander.deucher@....com,
        christian.koenig@....com, ray.huang@....com
Subject: Re: [PATCH] drm/amd: Document device reset methods

Hi--

On 11/10/23 07:55, André Almeida wrote:
> Document what each amdgpu driver reset method does.
> 
> Signed-off-by: André Almeida <andrealmeid@...lia.com>
> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu.h | 20 ++++++++++++++++++++
>  1 file changed, 20 insertions(+)
> 
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> index a79d53bdbe13..500f86c79eb7 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> @@ -504,6 +504,26 @@ struct amdgpu_allowed_register_entry {
>  	bool grbm_indexed;
>  };
>  
> +/**
> + * enum amd_reset_method - Methods for resetting AMD GPU devices
> + *
> + * @AMD_RESET_METHOD_NONE: The device will not be reset.
> + * @AMD_RESET_LEGACY: Method reserved for SI/CIK asics.

                                                    ASICs.

> + * @AMD_RESET_MODE0: High level PCIe reset.
> + * @AMD_RESET_MODE1: Resets each IP block (SDMA, GFX, VCN, etc.) individually.
> + *                   Suitable only for some discrete GPUs.
> + * @AMD_RESET_MODE2: Resets only the GFX block. Useful for APUs, giving that
> + *                   the rest of IP blocks and SMU is shared with the CPU.
> + * @AMD_RESET_BACO: BACO (Bus Alive, Chip Off) method powers off and on the card
> + *                  but without powering off the PCI bus. Suitable only for
> + *                  discrete GPUs.
> + * @AMD_RESET_PCI: Does a full bus reset, including powering on and off the
> + *                 card.
> + *
> + * Methods available for AMD GPU driver for resetting the device. Not all
> + * methods are suitable for every device. User can overwrite the method using

s/overwrite/override/
would make more sense to me.

Otherwise looks good. Thanks.

> + * module parameter `reset_method`.
> + */
>  enum amd_reset_method {
>  	AMD_RESET_METHOD_NONE = -1,
>  	AMD_RESET_METHOD_LEGACY = 0,

-- 
~Randy