drm/amdgpu: Move compute vm bug logic to amdgpu_vm.c

In review, Christian would like to keep the logic
  inside amdgpu_vm.c with a cost of slightly slower.
  The loop is still optimized out with this patch.

v2: remove the if statement. Now it is not slower.

Signed-off-by: Alex Xie <AlexBin.Xie@amd.com>
Reviewed-by: Christian König <christian.koeng@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -2190,6 +2190,8 @@ int amdgpu_device_init(struct amdgpu_device *adev,
 
 	adev->accel_working = true;
 
+	amdgpu_vm_check_compute_bug(adev);
+
 	/* Initialize the buffer migration limit. */
 	if (amdgpu_moverate >= 0)
 		max_MBps = amdgpu_moverate;

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

@@ -154,36 +154,6 @@ void amdgpu_ring_undo(struct amdgpu_ring *ring)
 		ring->funcs->end_use(ring);
 }
 
-/**
- * amdgpu_ring_check_compute_vm_bug - check whether this ring has compute vm bug
- *
- * @adev: amdgpu_device pointer
- * @ring: amdgpu_ring structure holding ring information
- */
-static void amdgpu_ring_check_compute_vm_bug(struct amdgpu_device *adev,
-					struct amdgpu_ring *ring)
-{
-	const struct amdgpu_ip_block *ip_block;
-
-	ring->has_compute_vm_bug = false;
-
-	if (ring->funcs->type != AMDGPU_RING_TYPE_COMPUTE)
-		/* only compute rings */
-		return;
-
-	ip_block = amdgpu_get_ip_block(adev, AMD_IP_BLOCK_TYPE_GFX);
-	if (!ip_block)
-		return;
-
-	/* Compute ring has a VM bug for GFX version < 7.
-           And compute ring has a VM bug for GFX 8 MEC firmware version < 673.*/
-	if (ip_block->version->major <= 7) {
-		ring->has_compute_vm_bug = true;
-	} else if (ip_block->version->major == 8)
-		if (adev->gfx.mec_fw_version < 673)
-			ring->has_compute_vm_bug = true;
-}
-
 /**
  * amdgpu_ring_init - init driver ring struct.
  *
@@ -292,8 +262,6 @@ int amdgpu_ring_init(struct amdgpu_device *adev, struct amdgpu_ring *ring,
 		DRM_ERROR("Failed to register debugfs file for rings !\n");
 	}
 
-	amdgpu_ring_check_compute_vm_bug(adev, ring);
-
 	return 0;
 }
 

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

@@ -212,9 +212,4 @@ static inline void amdgpu_ring_clear_ring(struct amdgpu_ring *ring)
 
 }
 
-static inline bool amdgpu_ring_has_compute_vm_bug(struct amdgpu_ring *ring)
-{
-	return ring->has_compute_vm_bug;
-}
-
 #endif

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

@@ -656,6 +656,41 @@ static int amdgpu_vm_alloc_reserved_vmid(struct amdgpu_device *adev,
 	return r;
 }
 
+/**
+ * amdgpu_vm_check_compute_bug - check whether asic has compute vm bug
+ *
+ * @adev: amdgpu_device pointer
+ */
+void amdgpu_vm_check_compute_bug(struct amdgpu_device *adev)
+{
+	const struct amdgpu_ip_block *ip_block;
+	bool has_compute_vm_bug;
+	struct amdgpu_ring *ring;
+	int i;
+
+	has_compute_vm_bug = false;
+
+	ip_block = amdgpu_get_ip_block(adev, AMD_IP_BLOCK_TYPE_GFX);
+	if (ip_block) {
+		/* Compute has a VM bug for GFX version < 7.
+		   Compute has a VM bug for GFX 8 MEC firmware version < 673.*/
+		if (ip_block->version->major <= 7)
+			has_compute_vm_bug = true;
+		else if (ip_block->version->major == 8)
+			if (adev->gfx.mec_fw_version < 673)
+				has_compute_vm_bug = true;
+	}
+
+	for (i = 0; i < adev->num_rings; i++) {
+		ring = adev->rings[i];
+		if (ring->funcs->type == AMDGPU_RING_TYPE_COMPUTE)
+			/* only compute rings */
+			ring->has_compute_vm_bug = has_compute_vm_bug;
+		else
+			ring->has_compute_vm_bug = false;
+	}
+}
+
 bool amdgpu_vm_need_pipeline_sync(struct amdgpu_ring *ring,
 				  struct amdgpu_job *job)
 {
@@ -664,8 +699,7 @@ bool amdgpu_vm_need_pipeline_sync(struct amdgpu_ring *ring,
 	struct amdgpu_vm_id_manager *id_mgr = &adev->vm_manager.id_mgr[vmhub];
 	struct amdgpu_vm_id *id;
 	bool gds_switch_needed;
-	bool vm_flush_needed = job->vm_needs_flush ||
+	bool vm_flush_needed = job->vm_needs_flush || ring->has_compute_vm_bug;
-		amdgpu_ring_has_compute_vm_bug(ring);
 
 	if (job->vm_id == 0)
 		return false;

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

@@ -245,5 +245,6 @@ void amdgpu_vm_adjust_size(struct amdgpu_device *adev, uint64_t vm_size);
 int amdgpu_vm_ioctl(struct drm_device *dev, void *data, struct drm_file *filp);
 bool amdgpu_vm_need_pipeline_sync(struct amdgpu_ring *ring,
 				  struct amdgpu_job *job);
+void amdgpu_vm_check_compute_bug(struct amdgpu_device *adev);
 
 #endif