linux-kernel - Re: [PATCH 2/4] drm/msm/a6xx: Fix GMU firmware parser

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Message-ID: <9df42327-b417-454d-9f4a-608979498f79@oss.qualcomm.com>
Date: Tue, 2 Sep 2025 14:29:43 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Akhil P Oommen <akhilpo@....qualcomm.com>,
        Rob Clark <robin.clark@....qualcomm.com>,
        Dmitry Baryshkov
 <lumag@...nel.org>,
        Abhinav Kumar <abhinav.kumar@...ux.dev>,
        Jessica Zhang <jessica.zhang@....qualcomm.com>,
        Sean Paul <sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Jordan Crouse <jordan@...micpenguin.net>,
        Jonathan Marek <jonathan@...ek.ca>
Cc: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] drm/msm/a6xx: Fix GMU firmware parser

On 9/2/25 1:50 PM, Akhil P Oommen wrote:
> Current parser logic for GMU firmware assumes a dword aligned payload
> size for every block. This is not true for all GMU firmwares. So, fix
> this by using correct 'size' value in the calculation for the offset
> for the next block's header.

Hm, I haven't seen this in the wild - do you have any specific examples?

> 
> Fixes: c6ed04f856a4 ("drm/msm/a6xx: A640/A650 GMU firmware path")
> Signed-off-by: Akhil P Oommen <akhilpo@....qualcomm.com>
> ---
>  drivers/gpu/drm/msm/adreno/a6xx_gmu.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> index 28e6705c6da682c7b41c748e375dda59a6551898..ea52374c9fcd481d816ed9608e9f6eb1c2e3005a 100644
> --- a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> @@ -758,6 +758,8 @@ static bool fw_block_mem(struct a6xx_gmu_bo *bo, const struct block_header *blk)
>  	return true;
>  }
>  
> +#define NEXT_BLK(blk) ((const struct block_header *)((const char *)blk + sizeof(*blk) + blk->size))

CHECK: Macro argument 'blk' may be better as '(blk)' to avoid precedence issues
#146: FILE: drivers/gpu/drm/msm/adreno/a6xx_gmu.c:761:
+#define NEXT_BLK(blk) ((const struct block_header *)((const char *)blk + sizeof(*blk) + blk->size))

Konrad