drm/xe: Simplify VM bind IOCTL error handling and cleanup

Clean up everything in VM bind IOCTL in 1 path for both errors and
non-errors. Also move VM bind IOCTL cleanup from ops (also used by
non-IOCTL binds) to the VM bind IOCTL.

v2:
 - Break ops_execute on error (Oak)

Cc: Oak Zeng <oak.zeng@intel.com>
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Oak Zeng <oak.zeng@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240425045513.1913039-7-matthew.brost@intel.com

drivers/gpu/drm/xe/xe_vm.c

@@ -743,8 +743,7 @@ static int xe_vm_ops_add_rebind(struct xe_vma_ops *vops, struct xe_vma *vma,
 }
 
 static struct dma_fence *ops_execute(struct xe_vm *vm,
-				     struct xe_vma_ops *vops,
-				     bool cleanup);
+				     struct xe_vma_ops *vops);
 static void xe_vma_ops_init(struct xe_vma_ops *vops);
 
 int xe_vm_rebind(struct xe_vm *vm, bool rebind_worker)
@@ -777,7 +776,7 @@ int xe_vm_rebind(struct xe_vm *vm, bool rebind_worker)
 			goto free_ops;
 	}
 
-	fence = ops_execute(vm, &vops, false);
+	fence = ops_execute(vm, &vops);
 	if (IS_ERR(fence)) {
 		err = PTR_ERR(fence);
 	} else {
@@ -2449,7 +2448,6 @@ static int vm_bind_ioctl_ops_parse(struct xe_vm *vm, struct xe_exec_queue *q,
 	if (!last_op)
 		return 0;
 
-	last_op->ops = ops;
 	if (last) {
 		last_op->flags |= XE_VMA_OP_LAST;
 		last_op->num_syncs = num_syncs;
@@ -2619,25 +2617,6 @@ xe_vma_op_execute(struct xe_vm *vm, struct xe_vma_op *op)
 	return fence;
 }
 
-static void xe_vma_op_cleanup(struct xe_vm *vm, struct xe_vma_op *op)
-{
-	bool last = op->flags & XE_VMA_OP_LAST;
-
-	if (last) {
-		while (op->num_syncs--)
-			xe_sync_entry_cleanup(&op->syncs[op->num_syncs]);
-		kfree(op->syncs);
-		if (op->q)
-			xe_exec_queue_put(op->q);
-	}
-	if (!list_empty(&op->link))
-		list_del(&op->link);
-	if (op->ops)
-		drm_gpuva_ops_free(&vm->gpuvm, op->ops);
-	if (last)
-		xe_vm_put(vm);
-}
-
 static void xe_vma_op_unwind(struct xe_vm *vm, struct xe_vma_op *op,
 			     bool post_commit, bool prev_post_commit,
 			     bool next_post_commit)
@@ -2714,8 +2693,6 @@ static void vm_bind_ioctl_ops_unwind(struct xe_vm *vm,
 					 op->flags & XE_VMA_OP_PREV_COMMITTED,
 					 op->flags & XE_VMA_OP_NEXT_COMMITTED);
 		}
-
-		drm_gpuva_ops_free(&vm->gpuvm, __ops);
 	}
 }
 
@@ -2803,24 +2780,20 @@ static int vm_bind_ioctl_ops_lock_and_prep(struct drm_exec *exec,
 }
 
 static struct dma_fence *ops_execute(struct xe_vm *vm,
-				     struct xe_vma_ops *vops,
-				     bool cleanup)
+				     struct xe_vma_ops *vops)
 {
 	struct xe_vma_op *op, *next;
 	struct dma_fence *fence = NULL;
 
 	list_for_each_entry_safe(op, next, &vops->list, link) {
-		if (!IS_ERR(fence)) {
 		dma_fence_put(fence);
 		fence = xe_vma_op_execute(vm, op);
-		}
 		if (IS_ERR(fence)) {
 			drm_warn(&vm->xe->drm, "VM op(%d) failed with %ld",
 				 op->base.op, PTR_ERR(fence));
 			fence = ERR_PTR(-ENOSPC);
+			break;
 		}
-		if (cleanup)
-			xe_vma_op_cleanup(vm, op);
 	}
 
 	return fence;
@@ -2843,7 +2816,7 @@ static int vm_bind_ioctl_ops_execute(struct xe_vm *vm,
 		if (err)
 			goto unlock;
 
-		fence = ops_execute(vm, vops, true);
+		fence = ops_execute(vm, vops);
 		if (IS_ERR(fence)) {
 			err = PTR_ERR(fence);
 			/* FIXME: Killing VM rather than proper error handling */
@@ -3204,30 +3177,14 @@ int xe_vm_bind_ioctl(struct drm_device *dev, void *data, struct drm_file *file)
 		goto unwind_ops;
 	}
 
-	xe_vm_get(vm);
-	if (q)
-		xe_exec_queue_get(q);
-
 	err = vm_bind_ioctl_ops_execute(vm, &vops);
 
-	up_write(&vm->lock);
-
-	if (q)
-		xe_exec_queue_put(q);
-	xe_vm_put(vm);
-
-	for (i = 0; bos && i < args->num_binds; ++i)
-		xe_bo_put(bos[i]);
-
-	kvfree(bos);
-	kvfree(ops);
-	if (args->num_binds > 1)
-		kvfree(bind_ops);
-
-	return err;
-
 unwind_ops:
+	if (err && err != -ENODATA)
 		vm_bind_ioctl_ops_unwind(vm, ops, args->num_binds);
+	for (i = args->num_binds - 1; i >= 0; --i)
+		if (ops[i])
+			drm_gpuva_ops_free(&vm->gpuvm, ops[i]);
 free_syncs:
 	if (err == -ENODATA)
 		err = vm_bind_ioctl_signal_fences(vm, q, syncs, num_syncs);

drivers/gpu/drm/xe/xe_vm_types.h

@@ -330,11 +330,6 @@ enum xe_vma_op_flags {
 struct xe_vma_op {
 	/** @base: GPUVA base operation */
 	struct drm_gpuva_op base;
-	/**
-	 * @ops: GPUVA ops, when set call drm_gpuva_ops_free after this
-	 * operations is processed
-	 */
-	struct drm_gpuva_ops *ops;
 	/** @q: exec queue for this operation */
 	struct xe_exec_queue *q;
 	/**