[PATCH 09/10] drm/amdgpu: sync to buffer moves before VM updates

[Christian König <deathsimple@xxxxxxxxxxx>]

From: Christian König <christian.koenig@xxxxxxx>

Otherwise we could update the VM page tables while the move is only scheduled.

Signed-off-by: Christian König <christian.koenig@xxxxxxx>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 23 +++++++++++++++++++----
 1 file changed, 19 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index 62a4c12..e9b44b1 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -780,6 +780,7 @@ static void amdgpu_vm_update_ptes(struct amdgpu_device *adev,
  * amdgpu_vm_bo_update_mapping - update a mapping in the vm page table
  *
  * @adev: amdgpu_device pointer
+ * @exclusive: fence we need to sync to
  * @src: address where to copy page table entries from
  * @pages_addr: DMA addresses to use for mapping
  * @vm: requested vm
@@ -793,6 +794,7 @@ static void amdgpu_vm_update_ptes(struct amdgpu_device *adev,
  * Returns 0 for success, -EINVAL for failure.
  */
 static int amdgpu_vm_bo_update_mapping(struct amdgpu_device *adev,
+				       struct fence *exclusive,
 				       uint64_t src,
 				       dma_addr_t *pages_addr,
 				       struct amdgpu_vm *vm,
@@ -853,6 +855,10 @@ static int amdgpu_vm_bo_update_mapping(struct amdgpu_device *adev,
 
 	vm_update_params.ib = &job->ibs[0];
 
+	r = amdgpu_sync_fence(adev, &job->sync, exclusive);
+	if (r)
+		goto error_free;
+
 	r = amdgpu_sync_resv(adev, &job->sync, vm->page_directory->tbo.resv,
 			     owner);
 	if (r)
@@ -889,6 +895,7 @@ error_free:
  * amdgpu_vm_bo_split_mapping - split a mapping into smaller chunks
  *
  * @adev: amdgpu_device pointer
+ * @exclusive: fence we need to sync to
  * @gtt_flags: flags as they are used for GTT
  * @pages_addr: DMA addresses to use for mapping
  * @vm: requested vm
@@ -902,6 +909,7 @@ error_free:
  * Returns 0 for success, -EINVAL for failure.
  */
 static int amdgpu_vm_bo_split_mapping(struct amdgpu_device *adev,
+				      struct fence *exclusive,
 				      uint32_t gtt_flags,
 				      dma_addr_t *pages_addr,
 				      struct amdgpu_vm *vm,
@@ -932,7 +940,8 @@ static int amdgpu_vm_bo_split_mapping(struct amdgpu_device *adev,
 	addr += mapping->offset;
 
 	if (!pages_addr || src)
-		return amdgpu_vm_bo_update_mapping(adev, src, pages_addr, vm,
+		return amdgpu_vm_bo_update_mapping(adev, exclusive,
+						   src, pages_addr, vm,
 						   start, mapping->it.last,
 						   flags, addr, fence);
 
@@ -940,7 +949,8 @@ static int amdgpu_vm_bo_split_mapping(struct amdgpu_device *adev,
 		uint64_t last;
 
 		last = min((uint64_t)mapping->it.last, start + max_size - 1);
-		r = amdgpu_vm_bo_update_mapping(adev, src, pages_addr, vm,
+		r = amdgpu_vm_bo_update_mapping(adev, exclusive,
+						src, pages_addr, vm,
 						start, last, flags, addr,
 						fence);
 		if (r)
@@ -973,6 +983,7 @@ int amdgpu_vm_bo_update(struct amdgpu_device *adev,
 	struct amdgpu_bo_va_mapping *mapping;
 	dma_addr_t *pages_addr = NULL;
 	uint32_t gtt_flags, flags;
+	struct fence *exclusive;
 	uint64_t addr;
 	int r;
 
@@ -994,8 +1005,11 @@ int amdgpu_vm_bo_update(struct amdgpu_device *adev,
 		default:
 			break;
 		}
+
+		exclusive = reservation_object_get_excl(bo_va->bo->tbo.resv);
 	} else {
 		addr = 0;
+		exclusive = NULL;
 	}
 
 	flags = amdgpu_ttm_tt_pte_flags(adev, bo_va->bo->tbo.ttm, mem);
@@ -1007,7 +1021,8 @@ int amdgpu_vm_bo_update(struct amdgpu_device *adev,
 	spin_unlock(&vm->status_lock);
 
 	list_for_each_entry(mapping, &bo_va->invalids, list) {
-		r = amdgpu_vm_bo_split_mapping(adev, gtt_flags, pages_addr, vm,
+		r = amdgpu_vm_bo_split_mapping(adev, exclusive,
+					       gtt_flags, pages_addr, vm,
 					       mapping, flags, addr,
 					       &bo_va->last_pt_update);
 		if (r)
@@ -1054,7 +1069,7 @@ int amdgpu_vm_clear_freed(struct amdgpu_device *adev,
 			struct amdgpu_bo_va_mapping, list);
 		list_del(&mapping->list);
 
-		r = amdgpu_vm_bo_split_mapping(adev, 0, NULL, vm, mapping,
+		r = amdgpu_vm_bo_split_mapping(adev, NULL, 0, NULL, vm, mapping,
 					       0, 0, NULL);
 		kfree(mapping);
 		if (r)
-- 
2.5.0

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