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From: Rob Clark <robdclark@gmail.com>
To: dri-devel@lists.freedesktop.org
Cc: freedreno@lists.freedesktop.org, linux-arm-msm@vger.kernel.org,
	Jordan Crouse <jordan@cosmicpenguin.net>,
	Akhil P Oommen <akhilpo@codeaurora.org>,
	Rob Clark <robdclark@chromium.org>,
	Rob Clark <robdclark@gmail.com>, Sean Paul <sean@poorly.run>,
	David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>,
	linux-kernel@vger.kernel.org (open list)
Subject: [PATCH 4/5] drm/msm: Handle fence rollover
Date: Tue,  9 Nov 2021 10:11:04 -0800	[thread overview]
Message-ID: <20211109181117.591148-5-robdclark@gmail.com> (raw)
In-Reply-To: <20211109181117.591148-1-robdclark@gmail.com>

From: Rob Clark <robdclark@chromium.org>

Add some helpers for fence comparision, which handle rollover properly,
and stop open coding fence seqno comparisions.

Signed-off-by: Rob Clark <robdclark@chromium.org>
---
 drivers/gpu/drm/msm/msm_fence.h | 12 ++++++++++++
 drivers/gpu/drm/msm/msm_gpu.c   |  6 +++---
 drivers/gpu/drm/msm/msm_gpu.h   |  2 +-
 3 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/msm/msm_fence.h b/drivers/gpu/drm/msm/msm_fence.h
index 4783db528bcc..17ee3822b423 100644
--- a/drivers/gpu/drm/msm/msm_fence.h
+++ b/drivers/gpu/drm/msm/msm_fence.h
@@ -60,4 +60,16 @@ void msm_update_fence(struct msm_fence_context *fctx, uint32_t fence);
 
 struct dma_fence * msm_fence_alloc(struct msm_fence_context *fctx);
 
+static inline bool
+fence_before(uint32_t a, uint32_t b)
+{
+   return (int32_t)(a - b) < 0;
+}
+
+static inline bool
+fence_after(uint32_t a, uint32_t b)
+{
+   return (int32_t)(a - b) > 0;
+}
+
 #endif
diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c
index 13de1241d595..0f78c2615272 100644
--- a/drivers/gpu/drm/msm/msm_gpu.c
+++ b/drivers/gpu/drm/msm/msm_gpu.c
@@ -172,7 +172,7 @@ static void update_fences(struct msm_gpu *gpu, struct msm_ringbuffer *ring,
 
 	spin_lock_irqsave(&ring->submit_lock, flags);
 	list_for_each_entry(submit, &ring->submits, node) {
-		if (submit->seqno > fence)
+		if (fence_after(submit->seqno, fence))
 			break;
 
 		msm_update_fence(submit->ring->fctx,
@@ -509,7 +509,7 @@ static void hangcheck_handler(struct timer_list *t)
 	if (fence != ring->hangcheck_fence) {
 		/* some progress has been made.. ya! */
 		ring->hangcheck_fence = fence;
-	} else if (fence < ring->seqno) {
+	} else if (fence_before(fence, ring->seqno)) {
 		/* no progress and not done.. hung! */
 		ring->hangcheck_fence = fence;
 		DRM_DEV_ERROR(dev->dev, "%s: hangcheck detected gpu lockup rb %d!\n",
@@ -523,7 +523,7 @@ static void hangcheck_handler(struct timer_list *t)
 	}
 
 	/* if still more pending work, reset the hangcheck timer: */
-	if (ring->seqno > ring->hangcheck_fence)
+	if (fence_after(ring->seqno, ring->hangcheck_fence))
 		hangcheck_timer_reset(gpu);
 
 	/* workaround for missing irq: */
diff --git a/drivers/gpu/drm/msm/msm_gpu.h b/drivers/gpu/drm/msm/msm_gpu.h
index 0dcc31c27ac3..bd4e0024033e 100644
--- a/drivers/gpu/drm/msm/msm_gpu.h
+++ b/drivers/gpu/drm/msm/msm_gpu.h
@@ -258,7 +258,7 @@ static inline bool msm_gpu_active(struct msm_gpu *gpu)
 	for (i = 0; i < gpu->nr_rings; i++) {
 		struct msm_ringbuffer *ring = gpu->rb[i];
 
-		if (ring->seqno > ring->memptrs->fence)
+		if (fence_after(ring->seqno, ring->memptrs->fence))
 			return true;
 	}
 
-- 
2.31.1


WARNING: multiple messages have this Message-ID (diff)
From: Rob Clark <robdclark@gmail.com>
To: dri-devel@lists.freedesktop.org
Cc: Rob Clark <robdclark@chromium.org>,
	David Airlie <airlied@linux.ie>,
	linux-arm-msm@vger.kernel.org,
	Akhil P Oommen <akhilpo@codeaurora.org>,
	Jordan Crouse <jordan@cosmicpenguin.net>,
	Sean Paul <sean@poorly.run>,
	freedreno@lists.freedesktop.org,
	open list <linux-kernel@vger.kernel.org>
Subject: [PATCH 4/5] drm/msm: Handle fence rollover
Date: Tue,  9 Nov 2021 10:11:04 -0800	[thread overview]
Message-ID: <20211109181117.591148-5-robdclark@gmail.com> (raw)
In-Reply-To: <20211109181117.591148-1-robdclark@gmail.com>

From: Rob Clark <robdclark@chromium.org>

Add some helpers for fence comparision, which handle rollover properly,
and stop open coding fence seqno comparisions.

Signed-off-by: Rob Clark <robdclark@chromium.org>
---
 drivers/gpu/drm/msm/msm_fence.h | 12 ++++++++++++
 drivers/gpu/drm/msm/msm_gpu.c   |  6 +++---
 drivers/gpu/drm/msm/msm_gpu.h   |  2 +-
 3 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/msm/msm_fence.h b/drivers/gpu/drm/msm/msm_fence.h
index 4783db528bcc..17ee3822b423 100644
--- a/drivers/gpu/drm/msm/msm_fence.h
+++ b/drivers/gpu/drm/msm/msm_fence.h
@@ -60,4 +60,16 @@ void msm_update_fence(struct msm_fence_context *fctx, uint32_t fence);
 
 struct dma_fence * msm_fence_alloc(struct msm_fence_context *fctx);
 
+static inline bool
+fence_before(uint32_t a, uint32_t b)
+{
+   return (int32_t)(a - b) < 0;
+}
+
+static inline bool
+fence_after(uint32_t a, uint32_t b)
+{
+   return (int32_t)(a - b) > 0;
+}
+
 #endif
diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c
index 13de1241d595..0f78c2615272 100644
--- a/drivers/gpu/drm/msm/msm_gpu.c
+++ b/drivers/gpu/drm/msm/msm_gpu.c
@@ -172,7 +172,7 @@ static void update_fences(struct msm_gpu *gpu, struct msm_ringbuffer *ring,
 
 	spin_lock_irqsave(&ring->submit_lock, flags);
 	list_for_each_entry(submit, &ring->submits, node) {
-		if (submit->seqno > fence)
+		if (fence_after(submit->seqno, fence))
 			break;
 
 		msm_update_fence(submit->ring->fctx,
@@ -509,7 +509,7 @@ static void hangcheck_handler(struct timer_list *t)
 	if (fence != ring->hangcheck_fence) {
 		/* some progress has been made.. ya! */
 		ring->hangcheck_fence = fence;
-	} else if (fence < ring->seqno) {
+	} else if (fence_before(fence, ring->seqno)) {
 		/* no progress and not done.. hung! */
 		ring->hangcheck_fence = fence;
 		DRM_DEV_ERROR(dev->dev, "%s: hangcheck detected gpu lockup rb %d!\n",
@@ -523,7 +523,7 @@ static void hangcheck_handler(struct timer_list *t)
 	}
 
 	/* if still more pending work, reset the hangcheck timer: */
-	if (ring->seqno > ring->hangcheck_fence)
+	if (fence_after(ring->seqno, ring->hangcheck_fence))
 		hangcheck_timer_reset(gpu);
 
 	/* workaround for missing irq: */
diff --git a/drivers/gpu/drm/msm/msm_gpu.h b/drivers/gpu/drm/msm/msm_gpu.h
index 0dcc31c27ac3..bd4e0024033e 100644
--- a/drivers/gpu/drm/msm/msm_gpu.h
+++ b/drivers/gpu/drm/msm/msm_gpu.h
@@ -258,7 +258,7 @@ static inline bool msm_gpu_active(struct msm_gpu *gpu)
 	for (i = 0; i < gpu->nr_rings; i++) {
 		struct msm_ringbuffer *ring = gpu->rb[i];
 
-		if (ring->seqno > ring->memptrs->fence)
+		if (fence_after(ring->seqno, ring->memptrs->fence))
 			return true;
 	}
 
-- 
2.31.1


  parent reply	other threads:[~2021-11-09 18:06 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-09 18:11 [PATCH 0/5] drm/msm: Cleanup and drm/sched tdr prep Rob Clark
2021-11-09 18:11 ` Rob Clark
2021-11-09 18:11 ` [PATCH 1/5] drm/msm: Remove unnecessary struct_mutex Rob Clark
2021-11-09 18:11   ` Rob Clark
2021-11-09 18:11 ` [PATCH 2/5] drm/msm: Drop priv->lastctx Rob Clark
2021-11-09 18:11   ` Rob Clark
2021-11-11 16:44   ` Akhil P Oommen
2021-11-11 16:44     ` Akhil P Oommen
2021-11-09 18:11 ` [PATCH 3/5] drm/msm: Remove struct_mutex usage Rob Clark
2021-11-09 18:11   ` Rob Clark
2021-11-09 18:11 ` Rob Clark [this message]
2021-11-09 18:11   ` [PATCH 4/5] drm/msm: Handle fence rollover Rob Clark
2021-11-11 16:58   ` Akhil P Oommen
2021-11-11 16:58     ` Akhil P Oommen
2021-11-09 18:11 ` [PATCH 5/5] drm/msm: Add debugfs to disable hw err handling Rob Clark
2021-11-09 18:11   ` Rob Clark
2021-11-11 17:14   ` Akhil P Oommen
2021-11-11 17:14     ` Akhil P Oommen

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