drm/radeon: Fix off-by-one errors in radeon_vm_bo_set_addr

commit 42ef344c upstream.

eoffset is sometimes treated as the last address inside the address
range, and sometimes as the first address outside the range. This
was resulting in errors when a test filled up the entire address
space. Make it consistent to always be the last address within the
range. Also fixed related errors when checking the VA limit and in
radeon_vm_fence_pts.
Signed-off-by: Felix.Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/gpu/drm/radeon/radeon_vm.c

@@ -455,15 +455,15 @@ int radeon_vm_bo_set_addr(struct radeon_device *rdev,
 
 	if (soffset) {
 		/* make sure object fit at this offset */
-		eoffset = soffset + size;
+		eoffset = soffset + size - 1;
 		if (soffset >= eoffset) {
 			r = -EINVAL;
 			goto error_unreserve;
 		}
 
 		last_pfn = eoffset / RADEON_GPU_PAGE_SIZE;
-		if (last_pfn > rdev->vm_manager.max_pfn) {
-			dev_err(rdev->dev, "va above limit (0x%08X > 0x%08X)\n",
+		if (last_pfn >= rdev->vm_manager.max_pfn) {
+			dev_err(rdev->dev, "va above limit (0x%08X >= 0x%08X)\n",
 				last_pfn, rdev->vm_manager.max_pfn);
 			r = -EINVAL;
 			goto error_unreserve;
@@ -478,7 +478,7 @@ int radeon_vm_bo_set_addr(struct radeon_device *rdev,
 	eoffset /= RADEON_GPU_PAGE_SIZE;
 	if (soffset || eoffset) {
 		struct interval_tree_node *it;
-		it = interval_tree_iter_first(&vm->va, soffset, eoffset - 1);
+		it = interval_tree_iter_first(&vm->va, soffset, eoffset);
 		if (it && it != &bo_va->it) {
 			struct radeon_bo_va *tmp;
 			tmp = container_of(it, struct radeon_bo_va, it);
@@ -518,7 +518,7 @@ int radeon_vm_bo_set_addr(struct radeon_device *rdev,
 	if (soffset || eoffset) {
 		spin_lock(&vm->status_lock);
 		bo_va->it.start = soffset;
-		bo_va->it.last = eoffset - 1;
+		bo_va->it.last = eoffset;
 		list_add(&bo_va->vm_status, &vm->cleared);
 		spin_unlock(&vm->status_lock);
 		interval_tree_insert(&bo_va->it, &vm->va);
@@ -888,7 +888,7 @@ static void radeon_vm_fence_pts(struct radeon_vm *vm,
 	unsigned i;
 
 	start >>= radeon_vm_block_size;
-	end >>= radeon_vm_block_size;
+	end = (end - 1) >> radeon_vm_block_size;
 
 	for (i = start; i <= end; ++i)
 		radeon_bo_fence(vm->page_tables[i].bo, fence, true);