linux-kernel - Re: [PATCH 1/7] drm/msm: Fix bv_fence being used as bv

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20240819195931.5xl2c3fupgy6atif@hu-akhilpo-hyd.qualcomm.com>
Date: Tue, 20 Aug 2024 01:29:31 +0530
From: Akhil P Oommen <quic_akhilpo@...cinc.com>
To: Antonino Maniscalco <antomani103@...il.com>
CC: Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        "Konrad
 Dybcio" <konrad.dybcio@...aro.org>,
        Abhinav Kumar
	<quic_abhinavk@...cinc.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        David Airlie
	<airlied@...il.com>, "Daniel Vetter" <daniel@...ll.ch>,
        Maarten Lankhorst
	<maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        <linux-arm-msm@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
        <freedreno@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/7] drm/msm: Fix bv_fence being used as bv_rptr

On Thu, Aug 15, 2024 at 08:26:11PM +0200, Antonino Maniscalco wrote:
> The bv_fence field of rbmemptrs was being used incorrectly as the BV
> rptr shadow pointer in some places.
> 
> Add a bv_rptr field and change the code to use that instead.
> 
> Signed-off-by: Antonino Maniscalco <antomani103@...il.com>

Reviewed-by: Akhil P Oommen <quic_akhilpo@...cinc.com>

-Akhil.

> ---
>  drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 2 +-
>  drivers/gpu/drm/msm/msm_ringbuffer.h  | 1 +
>  2 files changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> index bcaec86ac67a..32a4faa93d7f 100644
> --- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> @@ -1132,7 +1132,7 @@ static int hw_init(struct msm_gpu *gpu)
>  	/* ..which means "always" on A7xx, also for BV shadow */
>  	if (adreno_is_a7xx(adreno_gpu)) {
>  		gpu_write64(gpu, REG_A7XX_CP_BV_RB_RPTR_ADDR,
> -			    rbmemptr(gpu->rb[0], bv_fence));
> +			    rbmemptr(gpu->rb[0], bv_rptr));
>  	}
>  
>  	/* Always come up on rb 0 */
> diff --git a/drivers/gpu/drm/msm/msm_ringbuffer.h b/drivers/gpu/drm/msm/msm_ringbuffer.h
> index 0d6beb8cd39a..40791b2ade46 100644
> --- a/drivers/gpu/drm/msm/msm_ringbuffer.h
> +++ b/drivers/gpu/drm/msm/msm_ringbuffer.h
> @@ -31,6 +31,7 @@ struct msm_rbmemptrs {
>  	volatile uint32_t rptr;
>  	volatile uint32_t fence;
>  	/* Introduced on A7xx */
> +	volatile uint32_t bv_rptr;
>  	volatile uint32_t bv_fence;
>  
>  	volatile struct msm_gpu_submit_stats stats[MSM_GPU_SUBMIT_STATS_COUNT];
> 
> -- 
> 2.46.0
> 
>