linux-kernel - [PATCH v2 1/9] drm/msm: Fix bv_fence being used as bv

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Message-Id: <20240830-preemption-a750-t-v2-1-86aeead2cd80@gmail.com>
Date: Fri, 30 Aug 2024 17:32:43 +0200
From: Antonino Maniscalco <antomani103@...il.com>
To: 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>
Cc: linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org, 
 freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 Antonino Maniscalco <antomani103@...il.com>, 
 Akhil P Oommen <quic_akhilpo@...cinc.com>, 
 Neil Armstrong <neil.armstrong@...aro.org>
Subject: [PATCH v2 1/9] drm/msm: Fix bv_fence being used as bv_rptr

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>
Tested-by: Neil Armstrong <neil.armstrong@...aro.org> # on SM8650-QRD
---
 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