drm/amdgpu: cleanup sync_seq handling

Not used any more without semaphores
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Chunming Zhou <david1.zhou@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu.h

@@ -388,7 +388,7 @@ struct amdgpu_fence_driver {
 	uint64_t			gpu_addr;
 	volatile uint32_t		*cpu_addr;
 	/* sync_seq is protected by ring emission lock */
-	uint64_t			sync_seq[AMDGPU_MAX_RINGS];
+	uint64_t			sync_seq;
 	atomic64_t			last_seq;
 	bool				initialized;
 	struct amdgpu_irq_src		*irq_src;
@@ -441,11 +441,6 @@ int amdgpu_fence_wait_next(struct amdgpu_ring *ring);
 int amdgpu_fence_wait_empty(struct amdgpu_ring *ring);
 unsigned amdgpu_fence_count_emitted(struct amdgpu_ring *ring);
 
-bool amdgpu_fence_need_sync(struct amdgpu_fence *fence,
-			    struct amdgpu_ring *ring);
-void amdgpu_fence_note_sync(struct amdgpu_fence *fence,
-			    struct amdgpu_ring *ring);
-
 /*
  * TTM.
  */

drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c

@@ -107,7 +107,7 @@ int amdgpu_fence_emit(struct amdgpu_ring *ring, void *owner,
 	if ((*fence) == NULL) {
 		return -ENOMEM;
 	}
-	(*fence)->seq = ++ring->fence_drv.sync_seq[ring->idx];
+	(*fence)->seq = ++ring->fence_drv.sync_seq;
 	(*fence)->ring = ring;
 	(*fence)->owner = owner;
 	fence_init(&(*fence)->base, &amdgpu_fence_ops,
@@ -171,7 +171,7 @@ static bool amdgpu_fence_activity(struct amdgpu_ring *ring)
 	 */
 	last_seq = atomic64_read(&ring->fence_drv.last_seq);
 	do {
-		last_emitted = ring->fence_drv.sync_seq[ring->idx];
+		last_emitted = ring->fence_drv.sync_seq;
 		seq = amdgpu_fence_read(ring);
 		seq |= last_seq & 0xffffffff00000000LL;
 		if (seq < last_seq) {
@@ -274,7 +274,7 @@ static int amdgpu_fence_ring_wait_seq(struct amdgpu_ring *ring, uint64_t seq)
 	bool signaled = false;
 
 	BUG_ON(!ring);
-	if (seq > ring->fence_drv.sync_seq[ring->idx])
+	if (seq > ring->fence_drv.sync_seq)
 		return -EINVAL;
 
 	if (atomic64_read(&ring->fence_drv.last_seq) >= seq)
@@ -304,7 +304,7 @@ int amdgpu_fence_wait_next(struct amdgpu_ring *ring)
 {
 	uint64_t seq = atomic64_read(&ring->fence_drv.last_seq) + 1ULL;
 
-	if (seq >= ring->fence_drv.sync_seq[ring->idx])
+	if (seq >= ring->fence_drv.sync_seq)
 		return -ENOENT;
 
 	return amdgpu_fence_ring_wait_seq(ring, seq);
@@ -322,7 +322,7 @@ int amdgpu_fence_wait_next(struct amdgpu_ring *ring)
  */
 int amdgpu_fence_wait_empty(struct amdgpu_ring *ring)
 {
-	uint64_t seq = ring->fence_drv.sync_seq[ring->idx];
+	uint64_t seq = ring->fence_drv.sync_seq;
 
 	if (!seq)
 		return 0;
@@ -347,7 +347,7 @@ unsigned amdgpu_fence_count_emitted(struct amdgpu_ring *ring)
 	 * but it's ok to report slightly wrong fence count here.
 	 */
 	amdgpu_fence_process(ring);
-	emitted = ring->fence_drv.sync_seq[ring->idx]
+	emitted = ring->fence_drv.sync_seq
 		- atomic64_read(&ring->fence_drv.last_seq);
 	/* to avoid 32bits warp around */
 	if (emitted > 0x10000000)
@@ -356,68 +356,6 @@ unsigned amdgpu_fence_count_emitted(struct amdgpu_ring *ring)
 	return (unsigned)emitted;
 }
 
-/**
- * amdgpu_fence_need_sync - do we need a semaphore
- *
- * @fence: amdgpu fence object
- * @dst_ring: which ring to check against
- *
- * Check if the fence needs to be synced against another ring
- * (all asics).  If so, we need to emit a semaphore.
- * Returns true if we need to sync with another ring, false if
- * not.
- */
-bool amdgpu_fence_need_sync(struct amdgpu_fence *fence,
-			    struct amdgpu_ring *dst_ring)
-{
-	struct amdgpu_fence_driver *fdrv;
-
-	if (!fence)
-		return false;
-
-	if (fence->ring == dst_ring)
-		return false;
-
-	/* we are protected by the ring mutex */
-	fdrv = &dst_ring->fence_drv;
-	if (fence->seq <= fdrv->sync_seq[fence->ring->idx])
-		return false;
-
-	return true;
-}
-
-/**
- * amdgpu_fence_note_sync - record the sync point
- *
- * @fence: amdgpu fence object
- * @dst_ring: which ring to check against
- *
- * Note the sequence number at which point the fence will
- * be synced with the requested ring (all asics).
- */
-void amdgpu_fence_note_sync(struct amdgpu_fence *fence,
-			    struct amdgpu_ring *dst_ring)
-{
-	struct amdgpu_fence_driver *dst, *src;
-	unsigned i;
-
-	if (!fence)
-		return;
-
-	if (fence->ring == dst_ring)
-		return;
-
-	/* we are protected by the ring mutex */
-	src = &fence->ring->fence_drv;
-	dst = &dst_ring->fence_drv;
-	for (i = 0; i < AMDGPU_MAX_RINGS; ++i) {
-		if (i == dst_ring->idx)
-			continue;
-
-		dst->sync_seq[i] = max(dst->sync_seq[i], src->sync_seq[i]);
-	}
-}
-
 /**
  * amdgpu_fence_driver_start_ring - make the fence driver
  * ready for use on the requested ring.
@@ -471,14 +409,12 @@ int amdgpu_fence_driver_start_ring(struct amdgpu_ring *ring,
  */
 int amdgpu_fence_driver_init_ring(struct amdgpu_ring *ring)
 {
-	int i, r;
 	long timeout;
+	int r;
 
 	ring->fence_drv.cpu_addr = NULL;
 	ring->fence_drv.gpu_addr = 0;
-	for (i = 0; i < AMDGPU_MAX_RINGS; ++i)
-		ring->fence_drv.sync_seq[i] = 0;
-
+	ring->fence_drv.sync_seq = 0;
 	atomic64_set(&ring->fence_drv.last_seq, 0);
 	ring->fence_drv.initialized = false;
 
@@ -650,7 +586,7 @@ void amdgpu_fence_driver_force_completion(struct amdgpu_device *adev)
 		if (!ring || !ring->fence_drv.initialized)
 			continue;
 
-		amdgpu_fence_write(ring, ring->fence_drv.sync_seq[i]);
+		amdgpu_fence_write(ring, ring->fence_drv.sync_seq);
 	}
 }
 
@@ -780,7 +716,7 @@ static int amdgpu_debugfs_fence_info(struct seq_file *m, void *data)
 	struct drm_info_node *node = (struct drm_info_node *)m->private;
 	struct drm_device *dev = node->minor->dev;
 	struct amdgpu_device *adev = dev->dev_private;
-	int i, j;
+	int i;
 
 	for (i = 0; i < AMDGPU_MAX_RINGS; ++i) {
 		struct amdgpu_ring *ring = adev->rings[i];
@@ -793,15 +729,7 @@ static int amdgpu_debugfs_fence_info(struct seq_file *m, void *data)
 		seq_printf(m, "Last signaled fence 0x%016llx\n",
 			   (unsigned long long)atomic64_read(&ring->fence_drv.last_seq));
 		seq_printf(m, "Last emitted        0x%016llx\n",
-			   ring->fence_drv.sync_seq[i]);
-
-		for (j = 0; j < AMDGPU_MAX_RINGS; ++j) {
-			struct amdgpu_ring *other = adev->rings[j];
-			if (i != j && other && other->fence_drv.initialized &&
-			    ring->fence_drv.sync_seq[j])
-				seq_printf(m, "Last sync to ring %d 0x%016llx\n",
-					   j, ring->fence_drv.sync_seq[j]);
-		}
+			   ring->fence_drv.sync_seq);
 	}
 	return 0;
 }

drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c

@@ -4766,7 +4766,7 @@ static void gfx_v8_0_ring_emit_vm_flush(struct amdgpu_ring *ring,
 					unsigned vm_id, uint64_t pd_addr)
 {
 	int usepfp = (ring->type == AMDGPU_RING_TYPE_GFX);
-	uint32_t seq = ring->fence_drv.sync_seq[ring->idx];
+	uint32_t seq = ring->fence_drv.sync_seq;
 	uint64_t addr = ring->fence_drv.gpu_addr;
 
 	amdgpu_ring_write(ring, PACKET3(PACKET3_WAIT_REG_MEM, 5));