1 // SPDX-License-Identifier: GPL-2.0
3  * Base infrastructure for Linux-z/VM Monitor Stream, Stage 1.
5  * data gathering modules.
114 static void appldata_timer_function(unsigned long data)  in appldata_timer_function()  argument
116 	queue_work(appldata_wq, (struct work_struct *) data);  in appldata_timer_function()
122  * call data gathering function for each (active) module
132 		if (ops->active == 1) {  in appldata_work_fn()
133 			ops->callback(ops->data);  in appldata_work_fn()
161 	rc = -ENOMEM;  in appldata_diag()
163 		id->record_nr = record_nr;  in appldata_diag()
164 		id->mod_lvl = (mod_lvl[0]) << 8 | mod_lvl[1];  in appldata_diag()
215  * Start/Stop timer, show status of timer (0 = not active, 1 = active)
224 		.procname	= ctl->procname,  in appldata_timer_handler()
225 		.data		= &timer_active,  in appldata_timer_handler()
247  * Set (CPU) timer interval for collection of data (in milliseconds), show
257 		.procname	= ctl->procname,  in appldata_interval_handler()
258 		.data		= &interval,  in appldata_interval_handler()
287 	int active;  in appldata_generic_handler()  local
289 		.data		= &active,  in appldata_generic_handler()
299 		if (&tmp_ops->ctl_table[2] == ctl) {  in appldata_generic_handler()
305 		return -ENODEV;  in appldata_generic_handler()
307 	ops = ctl->data;  in appldata_generic_handler()
308 	if (!try_module_get(ops->owner)) {	// protect this function  in appldata_generic_handler()
310 		return -ENODEV;  in appldata_generic_handler()
314 	active = ops->active;  in appldata_generic_handler()
317 		module_put(ops->owner);  in appldata_generic_handler()
322 	if (active && (ops->active == 0)) {  in appldata_generic_handler()
324 		if (!try_module_get(ops->owner)) {  in appldata_generic_handler()
326 			module_put(ops->owner);  in appldata_generic_handler()
327 			return -ENODEV;  in appldata_generic_handler()
329 		ops->callback(ops->data);	// init record  in appldata_generic_handler()
330 		rc = appldata_diag(ops->record_nr,  in appldata_generic_handler()
332 					(unsigned long) ops->data, ops->size,  in appldata_generic_handler()
333 					ops->mod_lvl);  in appldata_generic_handler()
335 			pr_err("Starting the data collection for %s "  in appldata_generic_handler()
336 			       "failed with rc=%d\n", ops->name, rc);  in appldata_generic_handler()
337 			module_put(ops->owner);  in appldata_generic_handler()
339 			ops->active = 1;  in appldata_generic_handler()
340 	} else if (!active && (ops->active == 1)) {  in appldata_generic_handler()
341 		ops->active = 0;  in appldata_generic_handler()
342 		rc = appldata_diag(ops->record_nr, APPLDATA_STOP_REC,  in appldata_generic_handler()
343 				(unsigned long) ops->data, ops->size,  in appldata_generic_handler()
344 				ops->mod_lvl);  in appldata_generic_handler()
346 			pr_err("Stopping the data collection for %s "  in appldata_generic_handler()
347 			       "failed with rc=%d\n", ops->name, rc);  in appldata_generic_handler()
348 		module_put(ops->owner);  in appldata_generic_handler()
351 	module_put(ops->owner);  in appldata_generic_handler()
358 /************************* module-ops management *****************************/
366 	if (ops->size > APPLDATA_MAX_REC_SIZE)  in appldata_register_ops()
367 		return -EINVAL;  in appldata_register_ops()
369 	ops->ctl_table = kcalloc(4, sizeof(struct ctl_table), GFP_KERNEL);  in appldata_register_ops()
370 	if (!ops->ctl_table)  in appldata_register_ops()
371 		return -ENOMEM;  in appldata_register_ops()
374 	list_add(&ops->list, &appldata_ops_list);  in appldata_register_ops()
377 	ops->ctl_table[0].procname = appldata_proc_name;  in appldata_register_ops()
378 	ops->ctl_table[0].maxlen   = 0;  in appldata_register_ops()
379 	ops->ctl_table[0].mode     = S_IRUGO | S_IXUGO;  in appldata_register_ops()
380 	ops->ctl_table[0].child    = &ops->ctl_table[2];  in appldata_register_ops()
382 	ops->ctl_table[2].procname = ops->name;  in appldata_register_ops()
383 	ops->ctl_table[2].mode     = S_IRUGO | S_IWUSR;  in appldata_register_ops()
384 	ops->ctl_table[2].proc_handler = appldata_generic_handler;  in appldata_register_ops()
385 	ops->ctl_table[2].data = ops;  in appldata_register_ops()
387 	ops->sysctl_header = register_sysctl_table(ops->ctl_table);  in appldata_register_ops()
388 	if (!ops->sysctl_header)  in appldata_register_ops()
393 	list_del(&ops->list);  in appldata_register_ops()
395 	kfree(ops->ctl_table);  in appldata_register_ops()
396 	return -ENOMEM;  in appldata_register_ops()
407 	list_del(&ops->list);  in appldata_unregister_ops()
409 	unregister_sysctl_table(ops->sysctl_header);  in appldata_unregister_ops()
410 	kfree(ops->ctl_table);  in appldata_unregister_ops()
412 /********************** module-ops management <END> **************************/
432 		if (ops->active == 1) {  in appldata_freeze()
433 			rc = appldata_diag(ops->record_nr, APPLDATA_STOP_REC,  in appldata_freeze()
434 					(unsigned long) ops->data, ops->size,  in appldata_freeze()
435 					ops->mod_lvl);  in appldata_freeze()
437 				pr_err("Stopping the data collection for %s "  in appldata_freeze()
438 				       "failed with rc=%d\n", ops->name, rc);  in appldata_freeze()
461 		if (ops->active == 1) {  in appldata_restore()
462 			ops->callback(ops->data);	// init record  in appldata_restore()
463 			rc = appldata_diag(ops->record_nr,  in appldata_restore()
465 					(unsigned long) ops->data, ops->size,  in appldata_restore()
466 					ops->mod_lvl);  in appldata_restore()
468 				pr_err("Starting the data collection for %s "  in appldata_restore()
469 				       "failed with rc=%d\n", ops->name, rc);  in appldata_restore()
510 	appldata_timer.data = (unsigned long) &appldata_work;  in appldata_init()
516 	appldata_pdev = platform_device_register_simple("appldata", -1, NULL,  in appldata_init()
524 		rc = -ENOMEM;  in appldata_init()