// SPDX-License-Identifier: GPL-2.0-only/* * Copyright (c) 2023, Qualcomm Innovation Center, Inc. All rights reserved. */#include <linux/debugfs.h>#include <linux/interconnect.h>#include <linux/platform_device.h> #include "internal.h" /* * This can be dangerous, therefore don't provide any real compile time * configuration option for this feature. * People who want to use this will need to modify the source code directly. */#undef INTERCONNECT_ALLOW_WRITE_DEBUGFS #if defined(INTERCONNECT_ALLOW_WRITE_DEBUGFS) && defined(CONFIG_DEBUG_FS) static LIST_HEAD(debugfs_paths);static DEFINE_MUTEX(debugfs_lock); static struct platform_device *pdev;static struct icc_path *cur_path; static char *src_node;static char *dst_node;static u32 avg_bw;static u32 peak_bw;static u32 tag; struct debugfs_path {	const char *src;	const char *dst;	struct icc_path *path;	struct list_head list;}; static struct icc_path *get_path(const char *src, const char *dst){	struct debugfs_path *path; 	list_for_each_entry(path, &debugfs_paths, list) {		if (!strcmp(path->src, src) && !strcmp(path->dst, dst))			return path->path;	} 	return NULL;} static int icc_get_set(void *data, u64 val){	struct debugfs_path *debugfs_path;	char *src, *dst;	int ret = 0; 	mutex_lock(&debugfs_lock); 	rcu_read_lock();	src = rcu_dereference(src_node);	dst = rcu_dereference(dst_node); 	/*	 * If we've already looked up a path, then use the existing one instead	 * of calling icc_get() again. This allows for updating previous BW	 * votes when "get" is written to multiple times for multiple paths.	 */	cur_path = get_path(src, dst);	if (cur_path) {		rcu_read_unlock();		goto out;	} 	src = kstrdup(src, GFP_ATOMIC);	dst = kstrdup(dst, GFP_ATOMIC);	rcu_read_unlock(); 	if (!src || !dst) {		ret = -ENOMEM;		goto err_free;	} 	cur_path = icc_get(&pdev->dev, src, dst);	if (IS_ERR(cur_path)) {		ret = PTR_ERR(cur_path);		goto err_free;	} 	debugfs_path = kzalloc(sizeof(*debugfs_path), GFP_KERNEL);	if (!debugfs_path) {		ret = -ENOMEM;		goto err_put;	} 	debugfs_path->path = cur_path;	debugfs_path->src = src;	debugfs_path->dst = dst;	list_add_tail(&debugfs_path->list, &debugfs_paths); 	goto out; err_put:	icc_put(cur_path);err_free:	kfree(src);	kfree(dst);out:	mutex_unlock(&debugfs_lock);	return ret;} DEFINE_DEBUGFS_ATTRIBUTE(icc_get_fops, NULL, icc_get_set, "%llu\n"); static int icc_commit_set(void *data, u64 val){	int ret; 	mutex_lock(&debugfs_lock); 	if (!cur_path) {		ret = -EINVAL;		goto out;	} 	if (IS_ERR(cur_path)) {		ret = PTR_ERR(cur_path);		goto out;	} 	icc_set_tag(cur_path, tag);	ret = icc_set_bw(cur_path, avg_bw, peak_bw);out:	mutex_unlock(&debugfs_lock);	return ret;} DEFINE_DEBUGFS_ATTRIBUTE(icc_commit_fops, NULL, icc_commit_set, "%llu\n"); int icc_debugfs_client_init(struct dentry *icc_dir){	struct dentry *client_dir;	int ret; 	pdev = platform_device_alloc("icc-debugfs-client", PLATFORM_DEVID_NONE); 	ret = platform_device_add(pdev);	if (ret) {		pr_err("%s: failed to add platform device: %d\n", __func__, ret);		platform_device_put(pdev);		return ret;	} 	src_node = devm_kstrdup(&pdev->dev, "", GFP_KERNEL);	dst_node = devm_kstrdup(&pdev->dev, "", GFP_KERNEL);	if (!src_node || !dst_node)		return -ENOMEM; 	client_dir = debugfs_create_dir("test_client", icc_dir); 	debugfs_create_str("src_node", 0600, client_dir, &src_node);	debugfs_create_str("dst_node", 0600, client_dir, &dst_node);	debugfs_create_file("get", 0200, client_dir, NULL, &icc_get_fops);	debugfs_create_u32("avg_bw", 0600, client_dir, &avg_bw);	debugfs_create_u32("peak_bw", 0600, client_dir, &peak_bw);	debugfs_create_u32("tag", 0600, client_dir, &tag);	debugfs_create_file("commit", 0200, client_dir, NULL, &icc_commit_fops); 	return 0;} #else int icc_debugfs_client_init(struct dentry *icc_dir){	return 0;} #endif