drm/msm/gpu: Drop duplicate fence counter

The ring seqno counter duplicates the fence-context last_fence counter.
They end up getting incremented in lock-step, on the same scheduler
thread, but the split just makes things less obvious.
Signed-off-by: Rob Clark <robdclark@chromium.org>
Link: https://lore.kernel.org/r/20220411215849.297838-3-robdclark@gmail.comSigned-off-by: Rob Clark <robdclark@chromium.org>

drivers/gpu/drm/msm/adreno/a5xx_gpu.c

@@ -1235,7 +1235,7 @@ static void a5xx_fault_detect_irq(struct msm_gpu *gpu)
 		return;
 
 	DRM_DEV_ERROR(dev->dev, "gpu fault ring %d fence %x status %8.8X rb %4.4x/%4.4x ib1 %16.16llX/%4.4x ib2 %16.16llX/%4.4x\n",
-		ring ? ring->id : -1, ring ? ring->seqno : 0,
+		ring ? ring->id : -1, ring ? ring->fctx->last_fence : 0,
 		gpu_read(gpu, REG_A5XX_RBBM_STATUS),
 		gpu_read(gpu, REG_A5XX_CP_RB_RPTR),
 		gpu_read(gpu, REG_A5XX_CP_RB_WPTR),

drivers/gpu/drm/msm/adreno/a6xx_gpu.c

@@ -1390,7 +1390,7 @@ static void a6xx_fault_detect_irq(struct msm_gpu *gpu)
 
 	DRM_DEV_ERROR(&gpu->pdev->dev,
 		"gpu fault ring %d fence %x status %8.8X rb %4.4x/%4.4x ib1 %16.16llX/%4.4x ib2 %16.16llX/%4.4x\n",
-		ring ? ring->id : -1, ring ? ring->seqno : 0,
+		ring ? ring->id : -1, ring ? ring->fctx->last_fence : 0,
 		gpu_read(gpu, REG_A6XX_RBBM_STATUS),
 		gpu_read(gpu, REG_A6XX_CP_RB_RPTR),
 		gpu_read(gpu, REG_A6XX_CP_RB_WPTR),

drivers/gpu/drm/msm/adreno/adreno_gpu.c

@@ -578,7 +578,7 @@ int adreno_gpu_state_get(struct msm_gpu *gpu, struct msm_gpu_state *state)
 
 		state->ring[i].fence = gpu->rb[i]->memptrs->fence;
 		state->ring[i].iova = gpu->rb[i]->iova;
-		state->ring[i].seqno = gpu->rb[i]->seqno;
+		state->ring[i].seqno = gpu->rb[i]->fctx->last_fence;
 		state->ring[i].rptr = get_rptr(adreno_gpu, gpu->rb[i]);
 		state->ring[i].wptr = get_wptr(gpu->rb[i]);
 
@@ -828,7 +828,7 @@ void adreno_dump_info(struct msm_gpu *gpu)
 
 		printk("rb %d: fence:    %d/%d\n", i,
 			ring->memptrs->fence,
-			ring->seqno);
+			ring->fctx->last_fence);
 
 		printk("rptr:     %d\n", get_rptr(adreno_gpu, ring));
 		printk("rb wptr:  %d\n", get_wptr(ring));

drivers/gpu/drm/msm/msm_gpu.c

@@ -523,7 +523,7 @@ 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_before(fence, ring->seqno)) {
+	} else if (fence_before(fence, ring->fctx->last_fence)) {
 		/* no progress and not done.. hung! */
 		ring->hangcheck_fence = fence;
 		DRM_DEV_ERROR(dev->dev, "%s: hangcheck detected gpu lockup rb %d!\n",
@@ -531,13 +531,13 @@ static void hangcheck_handler(struct timer_list *t)
 		DRM_DEV_ERROR(dev->dev, "%s:     completed fence: %u\n",
 				gpu->name, fence);
 		DRM_DEV_ERROR(dev->dev, "%s:     submitted fence: %u\n",
-				gpu->name, ring->seqno);
+				gpu->name, ring->fctx->last_fence);
 
 		kthread_queue_work(gpu->worker, &gpu->recover_work);
 	}
 
 	/* if still more pending work, reset the hangcheck timer: */
-	if (fence_after(ring->seqno, ring->hangcheck_fence))
+	if (fence_after(ring->fctx->last_fence, ring->hangcheck_fence))
 		hangcheck_timer_reset(gpu);
 
 	/* workaround for missing irq: */
@@ -754,7 +754,7 @@ void msm_gpu_submit(struct msm_gpu *gpu, struct msm_gem_submit *submit)
 
 	msm_gpu_hw_init(gpu);
 
-	submit->seqno = ++ring->seqno;
+	submit->seqno = submit->hw_fence->seqno;
 
 	msm_rd_dump_submit(priv->rd, submit, NULL);
 

drivers/gpu/drm/msm/msm_gpu.h

@@ -291,7 +291,7 @@ 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 (fence_after(ring->seqno, ring->memptrs->fence))
+		if (fence_after(ring->fctx->last_fence, ring->memptrs->fence))
 			return true;
 	}
 

drivers/gpu/drm/msm/msm_ringbuffer.h

@@ -59,7 +59,6 @@ struct msm_ringbuffer {
 	spinlock_t submit_lock;
 
 	uint64_t iova;
-	uint32_t seqno;
 	uint32_t hangcheck_fence;
 	struct msm_rbmemptrs *memptrs;
 	uint64_t memptrs_iova;