1 // SPDX-License-Identifier: GPL-2.0
6  *    Author(s): Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
8  *    Uses gcc-internal data definitions.
9  *    Based on the gcov-kernel patch by:
10  *		 Hubertus Franke <frankeh@us.ibm.com>
11  *		 Nigel Hinds <nhinds@us.ibm.com>
12  *		 Rajan Ravindran <rajancr@us.ibm.com>
13  *		 Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
32  * struct gcov_node - represents a debugfs entry
70 /* If non-zero, keep copies of profiling data for unloaded modules. */
94 static void *gcov_seq_start(struct seq_file *seq, loff_t *pos)  in gcov_seq_start()  argument
98 	gcov_iter_start(seq->private);  in gcov_seq_start()
100 		if (gcov_iter_next(seq->private))  in gcov_seq_start()
103 	return seq->private;  in gcov_seq_start()
107 static void *gcov_seq_next(struct seq_file *seq, void *data, loff_t *pos)  in gcov_seq_next()  argument
119 static int gcov_seq_show(struct seq_file *seq, void *data)  in gcov_seq_show()  argument
123 	if (gcov_iter_write(iter, seq))  in gcov_seq_show()
124 		return -EINVAL;  in gcov_seq_show()
128 static void gcov_seq_stop(struct seq_file *seq, void *data)  in gcov_seq_stop()  argument
147 	if (node->num_loaded > 0)  in get_node_info()
148 		return node->loaded_info[0];  in get_node_info()
150 	return node->unloaded_info;  in get_node_info()
162 	if (node->unloaded_info)  in get_accumulated_info()
163 		info = gcov_info_dup(node->unloaded_info);  in get_accumulated_info()
165 		info = gcov_info_dup(node->loaded_info[i++]);  in get_accumulated_info()
168 	for (; i < node->num_loaded; i++)  in get_accumulated_info()
169 		gcov_info_add(info, node->loaded_info[i]);  in get_accumulated_info()
180 	struct gcov_node *node = inode->i_private;  in gcov_seq_open()
182 	struct seq_file *seq;  in gcov_seq_open()  local
184 	int rc = -ENOMEM;  in gcov_seq_open()
201 	seq = file->private_data;  in gcov_seq_open()
202 	seq->private = iter;  in gcov_seq_open()
222 	struct seq_file *seq;  in gcov_seq_release()  local
224 	seq = file->private_data;  in gcov_seq_release()
225 	iter = seq->private;  in gcov_seq_release()
259 	if (node->unloaded_info)  in reset_node()
260 		gcov_info_reset(node->unloaded_info);  in reset_node()
261 	for (i = 0; i < node->num_loaded; i++)  in reset_node()
262 		gcov_info_reset(node->loaded_info[i]);  in reset_node()
275 	struct seq_file *seq;  in gcov_seq_write()  local
279 	seq = file->private_data;  in gcov_seq_write()
280 	info = gcov_iter_get_info(seq->private);  in gcov_seq_write()
285 		if (node->num_loaded == 0)  in gcov_seq_write()
337 		if (ext->dir == SRC_TREE)  in get_link_target()
338 			result = link_target(srctree, rel, ext->ext);  in get_link_target()
340 			result = link_target(objtree, rel, ext->ext);  in get_link_target()
343 		result = link_target(NULL, filename, ext->ext);  in get_link_target()
353  * for filename skewing caused by the mod-versioning mechanism.
357 	if (strncmp(basename, SKEW_PREFIX, sizeof(SKEW_PREFIX) - 1) == 0)  in deskew()
358 		return basename + sizeof(SKEW_PREFIX) - 1;  in deskew()
375 	node->links = kcalloc(num, sizeof(struct dentry *), GFP_KERNEL);  in add_links()
376 	if (!node->links)  in add_links()
387 		node->links[i] = debugfs_create_symlink(deskew(basename),  in add_links()
395 	while (i-- > 0)  in add_links()
396 		debugfs_remove(node->links[i]);  in add_links()
397 	kfree(node->links);  in add_links()
398 	node->links = NULL;  in add_links()
413 	INIT_LIST_HEAD(&node->list);  in init_node()
414 	INIT_LIST_HEAD(&node->children);  in init_node()
415 	INIT_LIST_HEAD(&node->all);  in init_node()
416 	if (node->loaded_info) {  in init_node()
417 		node->loaded_info[0] = info;  in init_node()
418 		node->num_loaded = 1;  in init_node()
420 	node->parent = parent;  in init_node()
422 		strcpy(node->name, name);  in init_node()
438 		node->loaded_info = kcalloc(1, sizeof(struct gcov_info *),  in new_node()
440 		if (!node->loaded_info)  in new_node()
446 		node->dentry = debugfs_create_file(deskew(node->name), 0600,  in new_node()
447 					parent->dentry, node, &gcov_data_fops);  in new_node()
449 		node->dentry = debugfs_create_dir(node->name, parent->dentry);  in new_node()
451 		add_links(node, parent->dentry);  in new_node()
452 	list_add(&node->list, &parent->children);  in new_node()
453 	list_add(&node->all, &all_head);  in new_node()
468 	if (!node->links)  in remove_links()
471 		debugfs_remove(node->links[i]);  in remove_links()
472 	kfree(node->links);  in remove_links()
473 	node->links = NULL;  in remove_links()
482 	list_del(&node->list);  in release_node()
483 	list_del(&node->all);  in release_node()
484 	debugfs_remove(node->dentry);  in release_node()
486 	kfree(node->loaded_info);  in release_node()
487 	if (node->unloaded_info)  in release_node()
488 		gcov_info_free(node->unloaded_info);  in release_node()
497 	while ((node != &root_node) && list_empty(&node->children)) {  in remove_node()
498 		parent = node->parent;  in remove_node()
513 	list_for_each_entry(node, &parent->children, list) {  in get_child_by_name()
514 		if (strcmp(node->name, name) == 0)  in get_child_by_name()
533 		if (node->num_loaded > 0)  in reset_write()
535 		else if (list_empty(&node->children)) {  in reset_write()
537 			/* Several nodes may have gone - restart loop. */  in reset_write()
584 			if (!parent->parent)  in add_node()
586 			parent = parent->parent;  in add_node()
617 	int num = node->num_loaded;  in add_info()
630 	memcpy(loaded_info, node->loaded_info,  in add_info()
639 		if (!gcov_info_is_compatible(node->unloaded_info, info)) {  in add_info()
643 			gcov_info_free(node->unloaded_info);  in add_info()
644 			node->unloaded_info = NULL;  in add_info()
651 		if (!gcov_info_is_compatible(node->loaded_info[0], info)) {  in add_info()
659 	kfree(node->loaded_info);  in add_info()
660 	node->loaded_info = loaded_info;  in add_info()
661 	node->num_loaded = num + 1;  in add_info()
671 	for (i = 0; i < node->num_loaded; i++) {  in get_info_index()
672 		if (node->loaded_info[i] == info)  in get_info_index()
675 	return -ENOENT;  in get_info_index()
683 	if (node->unloaded_info)  in save_info()
684 		gcov_info_add(node->unloaded_info, info);  in save_info()
686 		node->unloaded_info = gcov_info_dup(info);  in save_info()
687 		if (!node->unloaded_info) {  in save_info()
712 	node->loaded_info[i] = node->loaded_info[node->num_loaded - 1];  in remove_info()
713 	node->num_loaded--;  in remove_info()
714 	if (node->num_loaded > 0)  in remove_info()
717 	kfree(node->loaded_info);  in remove_info()
718 	node->loaded_info = NULL;  in remove_info()
719 	node->num_loaded = 0;  in remove_info()
720 	if (!node->unloaded_info)  in remove_info()
726  * -fprofile-arcs is loaded/unloaded.
768 	/* Replay previous events to get our fs hierarchy up-to-date. */  in gcov_fs_init()