linux-kernel - Re: [PATCH] modified: gpu/drm/panfrost/panfrost

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Date:   Thu, 10 Jun 2021 11:41:52 +0100
From:   Steven Price <steven.price@....com>
To:     ChunyouTang <tangchunyou@....com>, robh@...nel.org,
        tomeu.vizoso@...labora.com, alyssa.rosenzweig@...labora.com,
        airlied@...ux.ie, daniel@...ll.ch
Cc:     tangchunyou@...becorp.cn, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org,
        tangchunyou <tangchunyou@....icubecorp.cn>
Subject: Re: [PATCH] modified: gpu/drm/panfrost/panfrost_gpu.c

The subject should have the prefix "drm/panfrost" and should mention
what the patch is changing (not just the filename).

On 09/06/2021 07:38, ChunyouTang wrote:
> From: tangchunyou <tangchunyou@....icubecorp.cn>
> 
> The GPU exception fault status register(0x3C),the low 8 bit is the
> EXCEPTION_TYPE.We can see the description at P3-78 in spec.

Nit: When referring to a spec it's always good to mention the name - I'm
not sure which specification you found this in.

> 
> Signed-off-by: tangchunyou <tangchunyou@....icubecorp.cn>
> ---
>  drivers/gpu/drm/panfrost/panfrost_gpu.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/panfrost/panfrost_gpu.c b/drivers/gpu/drm/panfrost/panfrost_gpu.c
> index 2aae636f1cf5..1fffb6a0b24f 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_gpu.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_gpu.c
> @@ -33,7 +33,7 @@ static irqreturn_t panfrost_gpu_irq_handler(int irq, void *data)
>  		address |= gpu_read(pfdev, GPU_FAULT_ADDRESS_LO);
>  
>  		dev_warn(pfdev->dev, "GPU Fault 0x%08x (%s) at 0x%016llx\n",
> -			 fault_status & 0xFF, panfrost_exception_name(pfdev, fault_status),
> +			 fault_status & 0xFF, panfrost_exception_name(pfdev, fault_status & 0xFF),

However this change is correct - panfrost_exception_name() should be
taking only the lower 8 bits. Even better though would be to to report
the full raw fault information as well as the high bits can contain
useful information:

	dev_warn(pfdev->dev, "GPU Fault 0x%08x (%s) at 0x%016llx\n",
		 fault_status,
		 panfrost_exception_name(pfdev, fault_status & 0xFF),
		 address);

Thanks,

Steve

>  			 address);
>  
>  		if (state & GPU_IRQ_MULTIPLE_FAULT)
>