1 // SPDX-License-Identifier: GPL-2.0
3  * Copyright (C) 2019-2022 Red Hat, Inc. Daniel Bristot de Oliveira <bristot@kernel.org>
10  * But other reactions can be added (on-demand) via this interface.
33  *    - List the available reactors, one per line.
42  *    - It is an on/off general switch for reactors, disabling
46  *    - List available reactors, with the select reaction for the given
49  *    - Writing the name of an reactor enables it to the given
78 		if (strcmp(name, r->name) == 0)  in get_reactor_rdef_by_name()
91 	seq_printf(m, "%s\n", reactor->name);  in reactors_show()
92 	return 0;  in reactors_show()
141 	struct rv_monitor *mon = m->private;  in monitor_reactor_show()  local
144 	if (mon->reactor == reactor)  in monitor_reactor_show()
145 		seq_printf(m, "[%s]\n", reactor->name);  in monitor_reactor_show()
147 		seq_printf(m, "%s\n", reactor->name);  in monitor_reactor_show()
148 	return 0;  in monitor_reactor_show()
161 static void monitor_swap_reactors_single(struct rv_monitor *mon,  in monitor_swap_reactors_single()  argument
168 	if (mon->reactor == reactor)  in monitor_swap_reactors_single()
171 	monitor_enabled = mon->enabled;  in monitor_swap_reactors_single()
173 		rv_disable_monitor(mon);  in monitor_swap_reactors_single()
175 	mon->reactor = reactor;  in monitor_swap_reactors_single()
176 	mon->react = reactor->react;  in monitor_swap_reactors_single()
180 		rv_enable_monitor(mon);  in monitor_swap_reactors_single()
183 static void monitor_swap_reactors(struct rv_monitor *mon, struct rv_reactor *reactor)  in monitor_swap_reactors()  argument
185 	struct rv_monitor *p = mon;  in monitor_swap_reactors()
187 	if (rv_is_container_monitor(mon))  in monitor_swap_reactors()
189 			if (p->parent != mon)  in monitor_swap_reactors()
199 	monitor_swap_reactors_single(mon, reactor, false);  in monitor_swap_reactors()
207 	struct rv_monitor *mon;  in monitor_reactors_write()  local
210 	int retval = -EINVAL;  in monitor_reactors_write()
215 		return -EINVAL;  in monitor_reactors_write()
217 	memset(buff, 0, sizeof(buff));  in monitor_reactors_write()
219 	retval = simple_write_to_buffer(buff, sizeof(buff) - 1, ppos, user_buf, count);  in monitor_reactors_write()
220 	if (retval < 0)  in monitor_reactors_write()
221 		return -EFAULT;  in monitor_reactors_write()
232 	seq_f = file->private_data;  in monitor_reactors_write()
233 	mon = seq_f->private;  in monitor_reactors_write()
237 	retval = -EINVAL;  in monitor_reactors_write()
240 		if (strcmp(ptr, reactor->name) != 0)  in monitor_reactors_write()
243 		monitor_swap_reactors(mon, reactor);  in monitor_reactors_write()
259 	struct rv_monitor *mon = inode->i_private;  in monitor_reactors_open()  local
264 	if (ret < 0)  in monitor_reactors_open()
268 	 * seq_open stores the seq_file on the file->private data.  in monitor_reactors_open()
270 	seq_f = file->private_data;  in monitor_reactors_open()
275 	seq_f->private = mon;  in monitor_reactors_open()
277 	return 0;  in monitor_reactors_open()
293 		if (strcmp(reactor->name, r->name) == 0) {  in __rv_register_reactor()
294 			pr_info("Reactor %s is already registered\n", reactor->name);  in __rv_register_reactor()
295 			return -EINVAL;  in __rv_register_reactor()
299 	list_add_tail(&reactor->list, &rv_reactors_list);  in __rv_register_reactor()
301 	return 0;  in __rv_register_reactor()
305  * rv_register_reactor - register a rv reactor.
308  * Returns 0 if successful, error otherwise.
312 	int retval = 0;  in rv_register_reactor()
314 	if (strlen(reactor->name) >= MAX_RV_REACTOR_NAME_SIZE) {  in rv_register_reactor()
316 			reactor->name, MAX_RV_MONITOR_NAME_SIZE);  in rv_register_reactor()
317 		return -EINVAL;  in rv_register_reactor()
327  * rv_unregister_reactor - unregister a rv reactor.
330  * Returns 0 if successful, error otherwise.
335 	list_del(&reactor->list);  in rv_unregister_reactor()
337 	return 0;  in rv_unregister_reactor()
346  * rv_reacting_on - checks if reacting is on
348  * Returns 1 if on, 0 otherwise.
363 	buff = rv_reacting_on() ? "1\n" : "0\n";  in reacting_on_read_data()
401 	 * before returning to user-space.  in reacting_on_write_data()
417  * reactor_populate_monitor - creates per monitor reactors file
418  * @mon:	The monitor.
420  * Returns 0 if successful, error otherwise.
422 int reactor_populate_monitor(struct rv_monitor *mon)  in reactor_populate_monitor()  argument
426 	tmp = rv_create_file("reactors", RV_MODE_WRITE, mon->root_d, mon, &monitor_reactors_ops);  in reactor_populate_monitor()
428 		return -ENOMEM;  in reactor_populate_monitor()
433 	mon->reactor = get_reactor_rdef_by_name("nop");  in reactor_populate_monitor()
435 	return 0;  in reactor_populate_monitor()
447 	.description = "no-operation reactor: do nothing.",
471 	return 0;  in init_rv_reactors()
478 	return -ENOMEM;  in init_rv_reactors()