1 // SPDX-License-Identifier: GPL-2.0
3  * Base infrastructure for Linux-z/VM Monitor Stream, Stage 1.
5  * data gathering modules.
98 static void appldata_timer_function(unsigned long data)  in appldata_timer_function()  argument
100 	queue_work(appldata_wq, (struct work_struct *) data);  in appldata_timer_function()
106  * call data gathering function for each (active) module
116 		if (ops->active == 1) {  in appldata_work_fn()
117 			ops->callback(ops->data);  in appldata_work_fn()
145 	rc = -ENOMEM;  in appldata_diag()
147 		id->record_nr = record_nr;  in appldata_diag()
148 		id->mod_lvl = (mod_lvl[0]) << 8 | mod_lvl[1];  in appldata_diag()
199  * Start/Stop timer, show status of timer (0 = not active, 1 = active)
208 		.procname	= ctl->procname,  in appldata_timer_handler()
209 		.data		= &timer_active,  in appldata_timer_handler()
231  * Set (CPU) timer interval for collection of data (in milliseconds), show
241 		.procname	= ctl->procname,  in appldata_interval_handler()
242 		.data		= &interval,  in appldata_interval_handler()
271 	int active;  in appldata_generic_handler()  local
273 		.data		= &active,  in appldata_generic_handler()
283 		if (&tmp_ops->ctl_table[0] == ctl) {  in appldata_generic_handler()
289 		return -ENODEV;  in appldata_generic_handler()
291 	ops = ctl->data;  in appldata_generic_handler()
292 	if (!try_module_get(ops->owner)) {	// protect this function  in appldata_generic_handler()
294 		return -ENODEV;  in appldata_generic_handler()
298 	active = ops->active;  in appldata_generic_handler()
301 		module_put(ops->owner);  in appldata_generic_handler()
306 	if (active && (ops->active == 0)) {  in appldata_generic_handler()
308 		if (!try_module_get(ops->owner)) {  in appldata_generic_handler()
310 			module_put(ops->owner);  in appldata_generic_handler()
311 			return -ENODEV;  in appldata_generic_handler()
313 		ops->callback(ops->data);	// init record  in appldata_generic_handler()
314 		rc = appldata_diag(ops->record_nr,  in appldata_generic_handler()
316 					(unsigned long) ops->data, ops->size,  in appldata_generic_handler()
317 					ops->mod_lvl);  in appldata_generic_handler()
319 			pr_err("Starting the data collection for %s "  in appldata_generic_handler()
320 			       "failed with rc=%d\n", ops->name, rc);  in appldata_generic_handler()
321 			module_put(ops->owner);  in appldata_generic_handler()
323 			ops->active = 1;  in appldata_generic_handler()
324 	} else if (!active && (ops->active == 1)) {  in appldata_generic_handler()
325 		ops->active = 0;  in appldata_generic_handler()
326 		rc = appldata_diag(ops->record_nr, APPLDATA_STOP_REC,  in appldata_generic_handler()
327 				(unsigned long) ops->data, ops->size,  in appldata_generic_handler()
328 				ops->mod_lvl);  in appldata_generic_handler()
330 			pr_err("Stopping the data collection for %s "  in appldata_generic_handler()
331 			       "failed with rc=%d\n", ops->name, rc);  in appldata_generic_handler()
332 		module_put(ops->owner);  in appldata_generic_handler()
335 	module_put(ops->owner);  in appldata_generic_handler()
342 /************************* module-ops management *****************************/
350 	if (ops->size > APPLDATA_MAX_REC_SIZE)  in appldata_register_ops()
351 		return -EINVAL;  in appldata_register_ops()
353 	ops->ctl_table = kcalloc(1, sizeof(struct ctl_table), GFP_KERNEL);  in appldata_register_ops()
354 	if (!ops->ctl_table)  in appldata_register_ops()
355 		return -ENOMEM;  in appldata_register_ops()
358 	list_add(&ops->list, &appldata_ops_list);  in appldata_register_ops()
361 	ops->ctl_table[0].procname = ops->name;  in appldata_register_ops()
362 	ops->ctl_table[0].mode = S_IRUGO | S_IWUSR;  in appldata_register_ops()
363 	ops->ctl_table[0].proc_handler = appldata_generic_handler;  in appldata_register_ops()
364 	ops->ctl_table[0].data = ops;  in appldata_register_ops()
366 	ops->sysctl_header = register_sysctl_sz(appldata_proc_name, ops->ctl_table, 1);  in appldata_register_ops()
367 	if (!ops->sysctl_header)  in appldata_register_ops()
372 	list_del(&ops->list);  in appldata_register_ops()
374 	kfree(ops->ctl_table);  in appldata_register_ops()
375 	return -ENOMEM;  in appldata_register_ops()
386 	list_del(&ops->list);  in appldata_unregister_ops()
388 	unregister_sysctl_table(ops->sysctl_header);  in appldata_unregister_ops()
389 	kfree(ops->ctl_table);  in appldata_unregister_ops()
391 /********************** module-ops management <END> **************************/
405 	appldata_timer.data = (unsigned long) &appldata_work;  in appldata_init()
408 		return -ENOMEM;  in appldata_init()