xref: /openbmc/linux/drivers/acpi/sysfs.c (revision 84ed8a99) 
1 /*
2  * sysfs.c - ACPI sysfs interface to userspace.
3  */
4 
5 #include <linux/init.h>
6 #include <linux/kernel.h>
7 #include <linux/moduleparam.h>
8 #include <acpi/acpi_drivers.h>
9 
10 #include "internal.h"
11 
12 #define _COMPONENT		ACPI_SYSTEM_COMPONENT
13 ACPI_MODULE_NAME("sysfs");
14 
15 #define PREFIX "ACPI: "
16 
17 #ifdef CONFIG_ACPI_DEBUG
18 /*
19  * ACPI debug sysfs I/F, including:
20  * /sys/modules/acpi/parameters/debug_layer
21  * /sys/modules/acpi/parameters/debug_level
22  * /sys/modules/acpi/parameters/trace_method_name
23  * /sys/modules/acpi/parameters/trace_state
24  * /sys/modules/acpi/parameters/trace_debug_layer
25  * /sys/modules/acpi/parameters/trace_debug_level
26  */
27 
28 struct acpi_dlayer {
29 	const char *name;
30 	unsigned long value;
31 };
32 struct acpi_dlevel {
33 	const char *name;
34 	unsigned long value;
35 };
36 #define ACPI_DEBUG_INIT(v)	{ .name = #v, .value = v }
37 
38 static const struct acpi_dlayer acpi_debug_layers[] = {
39 	ACPI_DEBUG_INIT(ACPI_UTILITIES),
40 	ACPI_DEBUG_INIT(ACPI_HARDWARE),
41 	ACPI_DEBUG_INIT(ACPI_EVENTS),
42 	ACPI_DEBUG_INIT(ACPI_TABLES),
43 	ACPI_DEBUG_INIT(ACPI_NAMESPACE),
44 	ACPI_DEBUG_INIT(ACPI_PARSER),
45 	ACPI_DEBUG_INIT(ACPI_DISPATCHER),
46 	ACPI_DEBUG_INIT(ACPI_EXECUTER),
47 	ACPI_DEBUG_INIT(ACPI_RESOURCES),
48 	ACPI_DEBUG_INIT(ACPI_CA_DEBUGGER),
49 	ACPI_DEBUG_INIT(ACPI_OS_SERVICES),
50 	ACPI_DEBUG_INIT(ACPI_CA_DISASSEMBLER),
51 	ACPI_DEBUG_INIT(ACPI_COMPILER),
52 	ACPI_DEBUG_INIT(ACPI_TOOLS),
53 
54 	ACPI_DEBUG_INIT(ACPI_BUS_COMPONENT),
55 	ACPI_DEBUG_INIT(ACPI_AC_COMPONENT),
56 	ACPI_DEBUG_INIT(ACPI_BATTERY_COMPONENT),
57 	ACPI_DEBUG_INIT(ACPI_BUTTON_COMPONENT),
58 	ACPI_DEBUG_INIT(ACPI_SBS_COMPONENT),
59 	ACPI_DEBUG_INIT(ACPI_FAN_COMPONENT),
60 	ACPI_DEBUG_INIT(ACPI_PCI_COMPONENT),
61 	ACPI_DEBUG_INIT(ACPI_POWER_COMPONENT),
62 	ACPI_DEBUG_INIT(ACPI_CONTAINER_COMPONENT),
63 	ACPI_DEBUG_INIT(ACPI_SYSTEM_COMPONENT),
64 	ACPI_DEBUG_INIT(ACPI_THERMAL_COMPONENT),
65 	ACPI_DEBUG_INIT(ACPI_MEMORY_DEVICE_COMPONENT),
66 	ACPI_DEBUG_INIT(ACPI_VIDEO_COMPONENT),
67 	ACPI_DEBUG_INIT(ACPI_PROCESSOR_COMPONENT),
68 };
69 
70 static const struct acpi_dlevel acpi_debug_levels[] = {
71 	ACPI_DEBUG_INIT(ACPI_LV_INIT),
72 	ACPI_DEBUG_INIT(ACPI_LV_DEBUG_OBJECT),
73 	ACPI_DEBUG_INIT(ACPI_LV_INFO),
74 
75 	ACPI_DEBUG_INIT(ACPI_LV_INIT_NAMES),
76 	ACPI_DEBUG_INIT(ACPI_LV_PARSE),
77 	ACPI_DEBUG_INIT(ACPI_LV_LOAD),
78 	ACPI_DEBUG_INIT(ACPI_LV_DISPATCH),
79 	ACPI_DEBUG_INIT(ACPI_LV_EXEC),
80 	ACPI_DEBUG_INIT(ACPI_LV_NAMES),
81 	ACPI_DEBUG_INIT(ACPI_LV_OPREGION),
82 	ACPI_DEBUG_INIT(ACPI_LV_BFIELD),
83 	ACPI_DEBUG_INIT(ACPI_LV_TABLES),
84 	ACPI_DEBUG_INIT(ACPI_LV_VALUES),
85 	ACPI_DEBUG_INIT(ACPI_LV_OBJECTS),
86 	ACPI_DEBUG_INIT(ACPI_LV_RESOURCES),
87 	ACPI_DEBUG_INIT(ACPI_LV_USER_REQUESTS),
88 	ACPI_DEBUG_INIT(ACPI_LV_PACKAGE),
89 
90 	ACPI_DEBUG_INIT(ACPI_LV_ALLOCATIONS),
91 	ACPI_DEBUG_INIT(ACPI_LV_FUNCTIONS),
92 	ACPI_DEBUG_INIT(ACPI_LV_OPTIMIZATIONS),
93 
94 	ACPI_DEBUG_INIT(ACPI_LV_MUTEX),
95 	ACPI_DEBUG_INIT(ACPI_LV_THREADS),
96 	ACPI_DEBUG_INIT(ACPI_LV_IO),
97 	ACPI_DEBUG_INIT(ACPI_LV_INTERRUPTS),
98 
99 	ACPI_DEBUG_INIT(ACPI_LV_AML_DISASSEMBLE),
100 	ACPI_DEBUG_INIT(ACPI_LV_VERBOSE_INFO),
101 	ACPI_DEBUG_INIT(ACPI_LV_FULL_TABLES),
102 	ACPI_DEBUG_INIT(ACPI_LV_EVENTS),
103 };
104 
105 static int param_get_debug_layer(char *buffer, const struct kernel_param *kp)
106 {
107 	int result = 0;
108 	int i;
109 
110 	result = sprintf(buffer, "%-25s\tHex        SET\n", "Description");
111 
112 	for (i = 0; i < ARRAY_SIZE(acpi_debug_layers); i++) {
113 		result += sprintf(buffer + result, "%-25s\t0x%08lX [%c]\n",
114 				  acpi_debug_layers[i].name,
115 				  acpi_debug_layers[i].value,
116 				  (acpi_dbg_layer & acpi_debug_layers[i].value)
117 				  ? '*' : ' ');
118 	}
119 	result +=
120 	    sprintf(buffer + result, "%-25s\t0x%08X [%c]\n", "ACPI_ALL_DRIVERS",
121 		    ACPI_ALL_DRIVERS,
122 		    (acpi_dbg_layer & ACPI_ALL_DRIVERS) ==
123 		    ACPI_ALL_DRIVERS ? '*' : (acpi_dbg_layer & ACPI_ALL_DRIVERS)
124 		    == 0 ? ' ' : '-');
125 	result +=
126 	    sprintf(buffer + result,
127 		    "--\ndebug_layer = 0x%08X ( * = enabled)\n",
128 		    acpi_dbg_layer);
129 
130 	return result;
131 }
132 
133 static int param_get_debug_level(char *buffer, const struct kernel_param *kp)
134 {
135 	int result = 0;
136 	int i;
137 
138 	result = sprintf(buffer, "%-25s\tHex        SET\n", "Description");
139 
140 	for (i = 0; i < ARRAY_SIZE(acpi_debug_levels); i++) {
141 		result += sprintf(buffer + result, "%-25s\t0x%08lX [%c]\n",
142 				  acpi_debug_levels[i].name,
143 				  acpi_debug_levels[i].value,
144 				  (acpi_dbg_level & acpi_debug_levels[i].value)
145 				  ? '*' : ' ');
146 	}
147 	result +=
148 	    sprintf(buffer + result, "--\ndebug_level = 0x%08X (* = enabled)\n",
149 		    acpi_dbg_level);
150 
151 	return result;
152 }
153 
154 static const struct kernel_param_ops param_ops_debug_layer = {
155 	.set = param_set_uint,
156 	.get = param_get_debug_layer,
157 };
158 
159 static const struct kernel_param_ops param_ops_debug_level = {
160 	.set = param_set_uint,
161 	.get = param_get_debug_level,
162 };
163 
164 module_param_cb(debug_layer, &param_ops_debug_layer, &acpi_dbg_layer, 0644);
165 module_param_cb(debug_level, &param_ops_debug_level, &acpi_dbg_level, 0644);
166 
167 static char trace_method_name[6];
168 module_param_string(trace_method_name, trace_method_name, 6, 0644);
169 static unsigned int trace_debug_layer;
170 module_param(trace_debug_layer, uint, 0644);
171 static unsigned int trace_debug_level;
172 module_param(trace_debug_level, uint, 0644);
173 
174 static int param_set_trace_state(const char *val, struct kernel_param *kp)
175 {
176 	int result = 0;
177 
178 	if (!strncmp(val, "enable", sizeof("enable") - 1)) {
179 		result = acpi_debug_trace(trace_method_name, trace_debug_level,
180 					  trace_debug_layer, 0);
181 		if (result)
182 			result = -EBUSY;
183 		goto exit;
184 	}
185 
186 	if (!strncmp(val, "disable", sizeof("disable") - 1)) {
187 		int name = 0;
188 		result = acpi_debug_trace((char *)&name, trace_debug_level,
189 					  trace_debug_layer, 0);
190 		if (result)
191 			result = -EBUSY;
192 		goto exit;
193 	}
194 
195 	if (!strncmp(val, "1", 1)) {
196 		result = acpi_debug_trace(trace_method_name, trace_debug_level,
197 					  trace_debug_layer, 1);
198 		if (result)
199 			result = -EBUSY;
200 		goto exit;
201 	}
202 
203 	result = -EINVAL;
204 exit:
205 	return result;
206 }
207 
208 static int param_get_trace_state(char *buffer, struct kernel_param *kp)
209 {
210 	if (!acpi_gbl_trace_method_name)
211 		return sprintf(buffer, "disable");
212 	else {
213 		if (acpi_gbl_trace_flags & 1)
214 			return sprintf(buffer, "1");
215 		else
216 			return sprintf(buffer, "enable");
217 	}
218 	return 0;
219 }
220 
221 module_param_call(trace_state, param_set_trace_state, param_get_trace_state,
222 		  NULL, 0644);
223 #endif /* CONFIG_ACPI_DEBUG */
224 
225 
226 /* /sys/modules/acpi/parameters/aml_debug_output */
227 
228 module_param_named(aml_debug_output, acpi_gbl_enable_aml_debug_object,
229 		   bool, 0644);
230 MODULE_PARM_DESC(aml_debug_output,
231 		 "To enable/disable the ACPI Debug Object output.");
232 
233 /* /sys/module/acpi/parameters/acpica_version */
234 static int param_get_acpica_version(char *buffer, struct kernel_param *kp)
235 {
236 	int result;
237 
238 	result = sprintf(buffer, "%x", ACPI_CA_VERSION);
239 
240 	return result;
241 }
242 
243 module_param_call(acpica_version, NULL, param_get_acpica_version, NULL, 0444);
244 
245 /*
246  * ACPI table sysfs I/F:
247  * /sys/firmware/acpi/tables/
248  * /sys/firmware/acpi/tables/dynamic/
249  */
250 
251 static LIST_HEAD(acpi_table_attr_list);
252 static struct kobject *tables_kobj;
253 static struct kobject *dynamic_tables_kobj;
254 static struct kobject *hotplug_kobj;
255 
256 struct acpi_table_attr {
257 	struct bin_attribute attr;
258 	char name[8];
259 	int instance;
260 	struct list_head node;
261 };
262 
263 static ssize_t acpi_table_show(struct file *filp, struct kobject *kobj,
264 			       struct bin_attribute *bin_attr, char *buf,
265 			       loff_t offset, size_t count)
266 {
267 	struct acpi_table_attr *table_attr =
268 	    container_of(bin_attr, struct acpi_table_attr, attr);
269 	struct acpi_table_header *table_header = NULL;
270 	acpi_status status;
271 	char name[ACPI_NAME_SIZE];
272 
273 	if (strncmp(table_attr->name, "NULL", 4))
274 		memcpy(name, table_attr->name, ACPI_NAME_SIZE);
275 	else
276 		memcpy(name, "\0\0\0\0", 4);
277 
278 	status = acpi_get_table(name, table_attr->instance, &table_header);
279 	if (ACPI_FAILURE(status))
280 		return -ENODEV;
281 
282 	return memory_read_from_buffer(buf, count, &offset,
283 				       table_header, table_header->length);
284 }
285 
286 static void acpi_table_attr_init(struct acpi_table_attr *table_attr,
287 				 struct acpi_table_header *table_header)
288 {
289 	struct acpi_table_header *header = NULL;
290 	struct acpi_table_attr *attr = NULL;
291 
292 	sysfs_attr_init(&table_attr->attr.attr);
293 	if (table_header->signature[0] != '\0')
294 		memcpy(table_attr->name, table_header->signature,
295 		       ACPI_NAME_SIZE);
296 	else
297 		memcpy(table_attr->name, "NULL", 4);
298 
299 	list_for_each_entry(attr, &acpi_table_attr_list, node) {
300 		if (!memcmp(table_attr->name, attr->name, ACPI_NAME_SIZE))
301 			if (table_attr->instance < attr->instance)
302 				table_attr->instance = attr->instance;
303 	}
304 	table_attr->instance++;
305 
306 	if (table_attr->instance > 1 || (table_attr->instance == 1 &&
307 					 !acpi_get_table
308 					 (table_header->signature, 2, &header)))
309 		sprintf(table_attr->name + ACPI_NAME_SIZE, "%d",
310 			table_attr->instance);
311 
312 	table_attr->attr.size = table_header->length;
313 	table_attr->attr.read = acpi_table_show;
314 	table_attr->attr.attr.name = table_attr->name;
315 	table_attr->attr.attr.mode = 0400;
316 
317 	return;
318 }
319 
320 static acpi_status
321 acpi_sysfs_table_handler(u32 event, void *table, void *context)
322 {
323 	struct acpi_table_attr *table_attr;
324 
325 	switch (event) {
326 	case ACPI_TABLE_EVENT_LOAD:
327 		table_attr =
328 		    kzalloc(sizeof(struct acpi_table_attr), GFP_KERNEL);
329 		if (!table_attr)
330 			return AE_NO_MEMORY;
331 
332 		acpi_table_attr_init(table_attr, table);
333 		if (sysfs_create_bin_file(dynamic_tables_kobj,
334 					  &table_attr->attr)) {
335 			kfree(table_attr);
336 			return AE_ERROR;
337 		} else
338 			list_add_tail(&table_attr->node, &acpi_table_attr_list);
339 		break;
340 	case ACPI_TABLE_EVENT_UNLOAD:
341 		/*
342 		 * we do not need to do anything right now
343 		 * because the table is not deleted from the
344 		 * global table list when unloading it.
345 		 */
346 		break;
347 	default:
348 		return AE_BAD_PARAMETER;
349 	}
350 	return AE_OK;
351 }
352 
353 static int acpi_tables_sysfs_init(void)
354 {
355 	struct acpi_table_attr *table_attr;
356 	struct acpi_table_header *table_header = NULL;
357 	int table_index;
358 	acpi_status status;
359 	int ret;
360 
361 	tables_kobj = kobject_create_and_add("tables", acpi_kobj);
362 	if (!tables_kobj)
363 		goto err;
364 
365 	dynamic_tables_kobj = kobject_create_and_add("dynamic", tables_kobj);
366 	if (!dynamic_tables_kobj)
367 		goto err_dynamic_tables;
368 
369 	for (table_index = 0;; table_index++) {
370 		status = acpi_get_table_by_index(table_index, &table_header);
371 
372 		if (status == AE_BAD_PARAMETER)
373 			break;
374 
375 		if (ACPI_FAILURE(status))
376 			continue;
377 
378 		table_attr = NULL;
379 		table_attr = kzalloc(sizeof(*table_attr), GFP_KERNEL);
380 		if (!table_attr)
381 			return -ENOMEM;
382 
383 		acpi_table_attr_init(table_attr, table_header);
384 		ret = sysfs_create_bin_file(tables_kobj, &table_attr->attr);
385 		if (ret) {
386 			kfree(table_attr);
387 			return ret;
388 		}
389 		list_add_tail(&table_attr->node, &acpi_table_attr_list);
390 	}
391 
392 	kobject_uevent(tables_kobj, KOBJ_ADD);
393 	kobject_uevent(dynamic_tables_kobj, KOBJ_ADD);
394 	status = acpi_install_table_handler(acpi_sysfs_table_handler, NULL);
395 
396 	return ACPI_FAILURE(status) ? -EINVAL : 0;
397 err_dynamic_tables:
398 	kobject_put(tables_kobj);
399 err:
400 	return -ENOMEM;
401 }
402 
403 /*
404  * Detailed ACPI IRQ counters:
405  * /sys/firmware/acpi/interrupts/
406  */
407 
408 u32 acpi_irq_handled;
409 u32 acpi_irq_not_handled;
410 
411 #define COUNT_GPE 0
412 #define COUNT_SCI 1		/* acpi_irq_handled */
413 #define COUNT_SCI_NOT 2		/* acpi_irq_not_handled */
414 #define COUNT_ERROR 3		/* other */
415 #define NUM_COUNTERS_EXTRA 4
416 
417 struct event_counter {
418 	u32 count;
419 	u32 flags;
420 };
421 
422 static struct event_counter *all_counters;
423 static u32 num_gpes;
424 static u32 num_counters;
425 static struct attribute **all_attrs;
426 static u32 acpi_gpe_count;
427 
428 static struct attribute_group interrupt_stats_attr_group = {
429 	.name = "interrupts",
430 };
431 
432 static struct kobj_attribute *counter_attrs;
433 
434 static void delete_gpe_attr_array(void)
435 {
436 	struct event_counter *tmp = all_counters;
437 
438 	all_counters = NULL;
439 	kfree(tmp);
440 
441 	if (counter_attrs) {
442 		int i;
443 
444 		for (i = 0; i < num_gpes; i++)
445 			kfree(counter_attrs[i].attr.name);
446 
447 		kfree(counter_attrs);
448 	}
449 	kfree(all_attrs);
450 
451 	return;
452 }
453 
454 static void gpe_count(u32 gpe_number)
455 {
456 	acpi_gpe_count++;
457 
458 	if (!all_counters)
459 		return;
460 
461 	if (gpe_number < num_gpes)
462 		all_counters[gpe_number].count++;
463 	else
464 		all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS +
465 			     COUNT_ERROR].count++;
466 
467 	return;
468 }
469 
470 static void fixed_event_count(u32 event_number)
471 {
472 	if (!all_counters)
473 		return;
474 
475 	if (event_number < ACPI_NUM_FIXED_EVENTS)
476 		all_counters[num_gpes + event_number].count++;
477 	else
478 		all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS +
479 			     COUNT_ERROR].count++;
480 
481 	return;
482 }
483 
484 static void acpi_global_event_handler(u32 event_type, acpi_handle device,
485 	u32 event_number, void *context)
486 {
487 	if (event_type == ACPI_EVENT_TYPE_GPE)
488 		gpe_count(event_number);
489 
490 	if (event_type == ACPI_EVENT_TYPE_FIXED)
491 		fixed_event_count(event_number);
492 }
493 
494 static int get_status(u32 index, acpi_event_status *status,
495 		      acpi_handle *handle)
496 {
497 	int result = 0;
498 
499 	if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
500 		goto end;
501 
502 	if (index < num_gpes) {
503 		result = acpi_get_gpe_device(index, handle);
504 		if (result) {
505 			ACPI_EXCEPTION((AE_INFO, AE_NOT_FOUND,
506 					"Invalid GPE 0x%x", index));
507 			goto end;
508 		}
509 		result = acpi_get_gpe_status(*handle, index, status);
510 	} else if (index < (num_gpes + ACPI_NUM_FIXED_EVENTS))
511 		result = acpi_get_event_status(index - num_gpes, status);
512 
513 end:
514 	return result;
515 }
516 
517 static ssize_t counter_show(struct kobject *kobj,
518 			    struct kobj_attribute *attr, char *buf)
519 {
520 	int index = attr - counter_attrs;
521 	int size;
522 	acpi_handle handle;
523 	acpi_event_status status;
524 	int result = 0;
525 
526 	all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI].count =
527 	    acpi_irq_handled;
528 	all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT].count =
529 	    acpi_irq_not_handled;
530 	all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE].count =
531 	    acpi_gpe_count;
532 	size = sprintf(buf, "%8d", all_counters[index].count);
533 
534 	/* "gpe_all" or "sci" */
535 	if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
536 		goto end;
537 
538 	result = get_status(index, &status, &handle);
539 	if (result)
540 		goto end;
541 
542 	if (!(status & ACPI_EVENT_FLAG_HANDLE))
543 		size += sprintf(buf + size, "   invalid");
544 	else if (status & ACPI_EVENT_FLAG_ENABLED)
545 		size += sprintf(buf + size, "   enabled");
546 	else if (status & ACPI_EVENT_FLAG_WAKE_ENABLED)
547 		size += sprintf(buf + size, "   wake_enabled");
548 	else
549 		size += sprintf(buf + size, "   disabled");
550 
551 end:
552 	size += sprintf(buf + size, "\n");
553 	return result ? result : size;
554 }
555 
556 /*
557  * counter_set() sets the specified counter.
558  * setting the total "sci" file to any value clears all counters.
559  * enable/disable/clear a gpe/fixed event in user space.
560  */
561 static ssize_t counter_set(struct kobject *kobj,
562 			   struct kobj_attribute *attr, const char *buf,
563 			   size_t size)
564 {
565 	int index = attr - counter_attrs;
566 	acpi_event_status status;
567 	acpi_handle handle;
568 	int result = 0;
569 	unsigned long tmp;
570 
571 	if (index == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI) {
572 		int i;
573 		for (i = 0; i < num_counters; ++i)
574 			all_counters[i].count = 0;
575 		acpi_gpe_count = 0;
576 		acpi_irq_handled = 0;
577 		acpi_irq_not_handled = 0;
578 		goto end;
579 	}
580 
581 	/* show the event status for both GPEs and Fixed Events */
582 	result = get_status(index, &status, &handle);
583 	if (result)
584 		goto end;
585 
586 	if (!(status & ACPI_EVENT_FLAG_HANDLE)) {
587 		printk(KERN_WARNING PREFIX
588 		       "Can not change Invalid GPE/Fixed Event status\n");
589 		return -EINVAL;
590 	}
591 
592 	if (index < num_gpes) {
593 		if (!strcmp(buf, "disable\n") &&
594 		    (status & ACPI_EVENT_FLAG_ENABLED))
595 			result = acpi_disable_gpe(handle, index);
596 		else if (!strcmp(buf, "enable\n") &&
597 			 !(status & ACPI_EVENT_FLAG_ENABLED))
598 			result = acpi_enable_gpe(handle, index);
599 		else if (!strcmp(buf, "clear\n") &&
600 			 (status & ACPI_EVENT_FLAG_SET))
601 			result = acpi_clear_gpe(handle, index);
602 		else if (!kstrtoul(buf, 0, &tmp))
603 			all_counters[index].count = tmp;
604 		else
605 			result = -EINVAL;
606 	} else if (index < num_gpes + ACPI_NUM_FIXED_EVENTS) {
607 		int event = index - num_gpes;
608 		if (!strcmp(buf, "disable\n") &&
609 		    (status & ACPI_EVENT_FLAG_ENABLED))
610 			result = acpi_disable_event(event, ACPI_NOT_ISR);
611 		else if (!strcmp(buf, "enable\n") &&
612 			 !(status & ACPI_EVENT_FLAG_ENABLED))
613 			result = acpi_enable_event(event, ACPI_NOT_ISR);
614 		else if (!strcmp(buf, "clear\n") &&
615 			 (status & ACPI_EVENT_FLAG_SET))
616 			result = acpi_clear_event(event);
617 		else if (!kstrtoul(buf, 0, &tmp))
618 			all_counters[index].count = tmp;
619 		else
620 			result = -EINVAL;
621 	} else
622 		all_counters[index].count = strtoul(buf, NULL, 0);
623 
624 	if (ACPI_FAILURE(result))
625 		result = -EINVAL;
626 end:
627 	return result ? result : size;
628 }
629 
630 void acpi_irq_stats_init(void)
631 {
632 	acpi_status status;
633 	int i;
634 
635 	if (all_counters)
636 		return;
637 
638 	num_gpes = acpi_current_gpe_count;
639 	num_counters = num_gpes + ACPI_NUM_FIXED_EVENTS + NUM_COUNTERS_EXTRA;
640 
641 	all_attrs = kzalloc(sizeof(struct attribute *) * (num_counters + 1),
642 			    GFP_KERNEL);
643 	if (all_attrs == NULL)
644 		return;
645 
646 	all_counters = kzalloc(sizeof(struct event_counter) * (num_counters),
647 			       GFP_KERNEL);
648 	if (all_counters == NULL)
649 		goto fail;
650 
651 	status = acpi_install_global_event_handler(acpi_global_event_handler, NULL);
652 	if (ACPI_FAILURE(status))
653 		goto fail;
654 
655 	counter_attrs = kzalloc(sizeof(struct kobj_attribute) * (num_counters),
656 				GFP_KERNEL);
657 	if (counter_attrs == NULL)
658 		goto fail;
659 
660 	for (i = 0; i < num_counters; ++i) {
661 		char buffer[12];
662 		char *name;
663 
664 		if (i < num_gpes)
665 			sprintf(buffer, "gpe%02X", i);
666 		else if (i == num_gpes + ACPI_EVENT_PMTIMER)
667 			sprintf(buffer, "ff_pmtimer");
668 		else if (i == num_gpes + ACPI_EVENT_GLOBAL)
669 			sprintf(buffer, "ff_gbl_lock");
670 		else if (i == num_gpes + ACPI_EVENT_POWER_BUTTON)
671 			sprintf(buffer, "ff_pwr_btn");
672 		else if (i == num_gpes + ACPI_EVENT_SLEEP_BUTTON)
673 			sprintf(buffer, "ff_slp_btn");
674 		else if (i == num_gpes + ACPI_EVENT_RTC)
675 			sprintf(buffer, "ff_rt_clk");
676 		else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE)
677 			sprintf(buffer, "gpe_all");
678 		else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI)
679 			sprintf(buffer, "sci");
680 		else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT)
681 			sprintf(buffer, "sci_not");
682 		else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR)
683 			sprintf(buffer, "error");
684 		else
685 			sprintf(buffer, "bug%02X", i);
686 
687 		name = kstrdup(buffer, GFP_KERNEL);
688 		if (name == NULL)
689 			goto fail;
690 
691 		sysfs_attr_init(&counter_attrs[i].attr);
692 		counter_attrs[i].attr.name = name;
693 		counter_attrs[i].attr.mode = 0644;
694 		counter_attrs[i].show = counter_show;
695 		counter_attrs[i].store = counter_set;
696 
697 		all_attrs[i] = &counter_attrs[i].attr;
698 	}
699 
700 	interrupt_stats_attr_group.attrs = all_attrs;
701 	if (!sysfs_create_group(acpi_kobj, &interrupt_stats_attr_group))
702 		return;
703 
704 fail:
705 	delete_gpe_attr_array();
706 	return;
707 }
708 
709 static void __exit interrupt_stats_exit(void)
710 {
711 	sysfs_remove_group(acpi_kobj, &interrupt_stats_attr_group);
712 
713 	delete_gpe_attr_array();
714 
715 	return;
716 }
717 
718 static ssize_t
719 acpi_show_profile(struct device *dev, struct device_attribute *attr,
720 		  char *buf)
721 {
722 	return sprintf(buf, "%d\n", acpi_gbl_FADT.preferred_profile);
723 }
724 
725 static const struct device_attribute pm_profile_attr =
726 	__ATTR(pm_profile, S_IRUGO, acpi_show_profile, NULL);
727 
728 static ssize_t hotplug_enabled_show(struct kobject *kobj,
729 				    struct kobj_attribute *attr, char *buf)
730 {
731 	struct acpi_hotplug_profile *hotplug = to_acpi_hotplug_profile(kobj);
732 
733 	return sprintf(buf, "%d\n", hotplug->enabled);
734 }
735 
736 static ssize_t hotplug_enabled_store(struct kobject *kobj,
737 				     struct kobj_attribute *attr,
738 				     const char *buf, size_t size)
739 {
740 	struct acpi_hotplug_profile *hotplug = to_acpi_hotplug_profile(kobj);
741 	unsigned int val;
742 
743 	if (kstrtouint(buf, 10, &val) || val > 1)
744 		return -EINVAL;
745 
746 	acpi_scan_hotplug_enabled(hotplug, val);
747 	return size;
748 }
749 
750 static struct kobj_attribute hotplug_enabled_attr =
751 	__ATTR(enabled, S_IRUGO | S_IWUSR, hotplug_enabled_show,
752 		hotplug_enabled_store);
753 
754 static struct attribute *hotplug_profile_attrs[] = {
755 	&hotplug_enabled_attr.attr,
756 	NULL
757 };
758 
759 static struct kobj_type acpi_hotplug_profile_ktype = {
760 	.sysfs_ops = &kobj_sysfs_ops,
761 	.default_attrs = hotplug_profile_attrs,
762 };
763 
764 void acpi_sysfs_add_hotplug_profile(struct acpi_hotplug_profile *hotplug,
765 				    const char *name)
766 {
767 	int error;
768 
769 	if (!hotplug_kobj)
770 		goto err_out;
771 
772 	error = kobject_init_and_add(&hotplug->kobj,
773 		&acpi_hotplug_profile_ktype, hotplug_kobj, "%s", name);
774 	if (error)
775 		goto err_out;
776 
777 	kobject_uevent(&hotplug->kobj, KOBJ_ADD);
778 	return;
779 
780  err_out:
781 	pr_err(PREFIX "Unable to add hotplug profile '%s'\n", name);
782 }
783 
784 static ssize_t force_remove_show(struct kobject *kobj,
785 				 struct kobj_attribute *attr, char *buf)
786 {
787 	return sprintf(buf, "%d\n", !!acpi_force_hot_remove);
788 }
789 
790 static ssize_t force_remove_store(struct kobject *kobj,
791 				  struct kobj_attribute *attr,
792 				  const char *buf, size_t size)
793 {
794 	bool val;
795 	int ret;
796 
797 	ret = strtobool(buf, &val);
798 	if (ret < 0)
799 		return ret;
800 
801 	lock_device_hotplug();
802 	acpi_force_hot_remove = val;
803 	unlock_device_hotplug();
804 	return size;
805 }
806 
807 static const struct kobj_attribute force_remove_attr =
808 	__ATTR(force_remove, S_IRUGO | S_IWUSR, force_remove_show,
809 	       force_remove_store);
810 
811 int __init acpi_sysfs_init(void)
812 {
813 	int result;
814 
815 	result = acpi_tables_sysfs_init();
816 	if (result)
817 		return result;
818 
819 	hotplug_kobj = kobject_create_and_add("hotplug", acpi_kobj);
820 	result = sysfs_create_file(hotplug_kobj, &force_remove_attr.attr);
821 	if (result)
822 		return result;
823 
824 	result = sysfs_create_file(acpi_kobj, &pm_profile_attr.attr);
825 	return result;
826 }
827