drm/amdgpu: use PT for VM sync on unmap

Instead of the array which is used for ID management.
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Jammy Zhou <Jammy.Zhou@amd.com>
Reviewed-by: Chunming Zhou <david1.zhou@amd.com>

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

@@ -627,9 +627,14 @@ static int amdgpu_vm_update_ptes(struct amdgpu_device *adev,
 {
 	uint64_t mask = AMDGPU_VM_PTE_COUNT - 1;
 	uint64_t last_pte = ~0, last_dst = ~0;
+	void *owner = AMDGPU_FENCE_OWNER_VM;
 	unsigned count = 0;
 	uint64_t addr;
 
+	/* sync to everything on unmapping */
+	if (!(flags & AMDGPU_PTE_VALID))
+		owner = AMDGPU_FENCE_OWNER_UNDEFINED;
+
 	/* walk over the address space and update the page tables */
 	for (addr = start; addr < end; ) {
 		uint64_t pt_idx = addr >> amdgpu_vm_block_size;
@@ -638,8 +643,7 @@ static int amdgpu_vm_update_ptes(struct amdgpu_device *adev,
 		uint64_t pte;
 		int r;
 
-		amdgpu_sync_resv(adev, &ib->sync, pt->tbo.resv,
-				 AMDGPU_FENCE_OWNER_VM);
+		amdgpu_sync_resv(adev, &ib->sync, pt->tbo.resv, owner);
 		r = reservation_object_reserve_shared(pt->tbo.resv);
 		if (r)
 			return r;
@@ -790,17 +794,6 @@ static int amdgpu_vm_bo_update_mapping(struct amdgpu_device *adev,
 
 	ib->length_dw = 0;
 
-	if (!(flags & AMDGPU_PTE_VALID)) {
-		unsigned i;
-
-		for (i = 0; i < AMDGPU_MAX_RINGS; ++i) {
-			struct amdgpu_fence *f = vm->ids[i].last_id_use;
-			r = amdgpu_sync_fence(adev, &ib->sync, &f->base);
-			if (r)
-				return r;
-		}
-	}
-
 	r = amdgpu_vm_update_ptes(adev, vm, ib, mapping->it.start,
 				  mapping->it.last + 1, addr + mapping->offset,
 				  flags, gtt_flags);