xref: /openbmc/linux/drivers/acpi/sysfs.c (revision a8da474e)
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 <linux/acpi.h>
9 
10 #include "internal.h"
11 
12 #define _COMPONENT		ACPI_SYSTEM_COMPONENT
13 ACPI_MODULE_NAME("sysfs");
14 
15 #ifdef CONFIG_ACPI_DEBUG
16 /*
17  * ACPI debug sysfs I/F, including:
18  * /sys/modules/acpi/parameters/debug_layer
19  * /sys/modules/acpi/parameters/debug_level
20  * /sys/modules/acpi/parameters/trace_method_name
21  * /sys/modules/acpi/parameters/trace_state
22  * /sys/modules/acpi/parameters/trace_debug_layer
23  * /sys/modules/acpi/parameters/trace_debug_level
24  */
25 
26 struct acpi_dlayer {
27 	const char *name;
28 	unsigned long value;
29 };
30 struct acpi_dlevel {
31 	const char *name;
32 	unsigned long value;
33 };
34 #define ACPI_DEBUG_INIT(v)	{ .name = #v, .value = v }
35 
36 static const struct acpi_dlayer acpi_debug_layers[] = {
37 	ACPI_DEBUG_INIT(ACPI_UTILITIES),
38 	ACPI_DEBUG_INIT(ACPI_HARDWARE),
39 	ACPI_DEBUG_INIT(ACPI_EVENTS),
40 	ACPI_DEBUG_INIT(ACPI_TABLES),
41 	ACPI_DEBUG_INIT(ACPI_NAMESPACE),
42 	ACPI_DEBUG_INIT(ACPI_PARSER),
43 	ACPI_DEBUG_INIT(ACPI_DISPATCHER),
44 	ACPI_DEBUG_INIT(ACPI_EXECUTER),
45 	ACPI_DEBUG_INIT(ACPI_RESOURCES),
46 	ACPI_DEBUG_INIT(ACPI_CA_DEBUGGER),
47 	ACPI_DEBUG_INIT(ACPI_OS_SERVICES),
48 	ACPI_DEBUG_INIT(ACPI_CA_DISASSEMBLER),
49 	ACPI_DEBUG_INIT(ACPI_COMPILER),
50 	ACPI_DEBUG_INIT(ACPI_TOOLS),
51 
52 	ACPI_DEBUG_INIT(ACPI_BUS_COMPONENT),
53 	ACPI_DEBUG_INIT(ACPI_AC_COMPONENT),
54 	ACPI_DEBUG_INIT(ACPI_BATTERY_COMPONENT),
55 	ACPI_DEBUG_INIT(ACPI_BUTTON_COMPONENT),
56 	ACPI_DEBUG_INIT(ACPI_SBS_COMPONENT),
57 	ACPI_DEBUG_INIT(ACPI_FAN_COMPONENT),
58 	ACPI_DEBUG_INIT(ACPI_PCI_COMPONENT),
59 	ACPI_DEBUG_INIT(ACPI_POWER_COMPONENT),
60 	ACPI_DEBUG_INIT(ACPI_CONTAINER_COMPONENT),
61 	ACPI_DEBUG_INIT(ACPI_SYSTEM_COMPONENT),
62 	ACPI_DEBUG_INIT(ACPI_THERMAL_COMPONENT),
63 	ACPI_DEBUG_INIT(ACPI_MEMORY_DEVICE_COMPONENT),
64 	ACPI_DEBUG_INIT(ACPI_VIDEO_COMPONENT),
65 	ACPI_DEBUG_INIT(ACPI_PROCESSOR_COMPONENT),
66 };
67 
68 static const struct acpi_dlevel acpi_debug_levels[] = {
69 	ACPI_DEBUG_INIT(ACPI_LV_INIT),
70 	ACPI_DEBUG_INIT(ACPI_LV_DEBUG_OBJECT),
71 	ACPI_DEBUG_INIT(ACPI_LV_INFO),
72 	ACPI_DEBUG_INIT(ACPI_LV_REPAIR),
73 	ACPI_DEBUG_INIT(ACPI_LV_TRACE_POINT),
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[1024];
168 
169 int param_set_trace_method_name(const char *val, const struct kernel_param *kp)
170 {
171 	u32 saved_flags = 0;
172 	bool is_abs_path = true;
173 
174 	if (*val != '\\')
175 		is_abs_path = false;
176 
177 	if ((is_abs_path && strlen(val) > 1023) ||
178 	    (!is_abs_path && strlen(val) > 1022)) {
179 		pr_err("%s: string parameter too long\n", kp->name);
180 		return -ENOSPC;
181 	}
182 
183 	/*
184 	 * It's not safe to update acpi_gbl_trace_method_name without
185 	 * having the tracer stopped, so we save the original tracer
186 	 * state and disable it.
187 	 */
188 	saved_flags = acpi_gbl_trace_flags;
189 	(void)acpi_debug_trace(NULL,
190 			       acpi_gbl_trace_dbg_level,
191 			       acpi_gbl_trace_dbg_layer,
192 			       0);
193 
194 	/* This is a hack.  We can't kmalloc in early boot. */
195 	if (is_abs_path)
196 		strcpy(trace_method_name, val);
197 	else {
198 		trace_method_name[0] = '\\';
199 		strcpy(trace_method_name+1, val);
200 	}
201 
202 	/* Restore the original tracer state */
203 	(void)acpi_debug_trace(trace_method_name,
204 			       acpi_gbl_trace_dbg_level,
205 			       acpi_gbl_trace_dbg_layer,
206 			       saved_flags);
207 
208 	return 0;
209 }
210 
211 static int param_get_trace_method_name(char *buffer, const struct kernel_param *kp)
212 {
213 	return scnprintf(buffer, PAGE_SIZE, "%s", acpi_gbl_trace_method_name);
214 }
215 
216 static const struct kernel_param_ops param_ops_trace_method = {
217 	.set = param_set_trace_method_name,
218 	.get = param_get_trace_method_name,
219 };
220 
221 static const struct kernel_param_ops param_ops_trace_attrib = {
222 	.set = param_set_uint,
223 	.get = param_get_uint,
224 };
225 
226 module_param_cb(trace_method_name, &param_ops_trace_method, &trace_method_name, 0644);
227 module_param_cb(trace_debug_layer, &param_ops_trace_attrib, &acpi_gbl_trace_dbg_layer, 0644);
228 module_param_cb(trace_debug_level, &param_ops_trace_attrib, &acpi_gbl_trace_dbg_level, 0644);
229 
230 static int param_set_trace_state(const char *val, struct kernel_param *kp)
231 {
232 	acpi_status status;
233 	const char *method = trace_method_name;
234 	u32 flags = 0;
235 
236 /* So "xxx-once" comparison should go prior than "xxx" comparison */
237 #define acpi_compare_param(val, key)	\
238 	strncmp((val), (key), sizeof(key) - 1)
239 
240 	if (!acpi_compare_param(val, "enable")) {
241 		method = NULL;
242 		flags = ACPI_TRACE_ENABLED;
243 	} else if (!acpi_compare_param(val, "disable"))
244 		method = NULL;
245 	else if (!acpi_compare_param(val, "method-once"))
246 		flags = ACPI_TRACE_ENABLED | ACPI_TRACE_ONESHOT;
247 	else if (!acpi_compare_param(val, "method"))
248 		flags = ACPI_TRACE_ENABLED;
249 	else if (!acpi_compare_param(val, "opcode-once"))
250 		flags = ACPI_TRACE_ENABLED | ACPI_TRACE_ONESHOT | ACPI_TRACE_OPCODE;
251 	else if (!acpi_compare_param(val, "opcode"))
252 		flags = ACPI_TRACE_ENABLED | ACPI_TRACE_OPCODE;
253 	else
254 		return -EINVAL;
255 
256 	status = acpi_debug_trace(method,
257 				  acpi_gbl_trace_dbg_level,
258 				  acpi_gbl_trace_dbg_layer,
259 				  flags);
260 	if (ACPI_FAILURE(status))
261 		return -EBUSY;
262 
263 	return 0;
264 }
265 
266 static int param_get_trace_state(char *buffer, struct kernel_param *kp)
267 {
268 	if (!(acpi_gbl_trace_flags & ACPI_TRACE_ENABLED))
269 		return sprintf(buffer, "disable");
270 	else {
271 		if (acpi_gbl_trace_method_name) {
272 			if (acpi_gbl_trace_flags & ACPI_TRACE_ONESHOT)
273 				return sprintf(buffer, "method-once");
274 			else
275 				return sprintf(buffer, "method");
276 		} else
277 			return sprintf(buffer, "enable");
278 	}
279 	return 0;
280 }
281 
282 module_param_call(trace_state, param_set_trace_state, param_get_trace_state,
283 		  NULL, 0644);
284 #endif /* CONFIG_ACPI_DEBUG */
285 
286 
287 /* /sys/modules/acpi/parameters/aml_debug_output */
288 
289 module_param_named(aml_debug_output, acpi_gbl_enable_aml_debug_object,
290 		   byte, 0644);
291 MODULE_PARM_DESC(aml_debug_output,
292 		 "To enable/disable the ACPI Debug Object output.");
293 
294 /* /sys/module/acpi/parameters/acpica_version */
295 static int param_get_acpica_version(char *buffer, struct kernel_param *kp)
296 {
297 	int result;
298 
299 	result = sprintf(buffer, "%x", ACPI_CA_VERSION);
300 
301 	return result;
302 }
303 
304 module_param_call(acpica_version, NULL, param_get_acpica_version, NULL, 0444);
305 
306 /*
307  * ACPI table sysfs I/F:
308  * /sys/firmware/acpi/tables/
309  * /sys/firmware/acpi/tables/dynamic/
310  */
311 
312 static LIST_HEAD(acpi_table_attr_list);
313 static struct kobject *tables_kobj;
314 static struct kobject *dynamic_tables_kobj;
315 static struct kobject *hotplug_kobj;
316 
317 struct acpi_table_attr {
318 	struct bin_attribute attr;
319 	char name[8];
320 	int instance;
321 	struct list_head node;
322 };
323 
324 static ssize_t acpi_table_show(struct file *filp, struct kobject *kobj,
325 			       struct bin_attribute *bin_attr, char *buf,
326 			       loff_t offset, size_t count)
327 {
328 	struct acpi_table_attr *table_attr =
329 	    container_of(bin_attr, struct acpi_table_attr, attr);
330 	struct acpi_table_header *table_header = NULL;
331 	acpi_status status;
332 	char name[ACPI_NAME_SIZE];
333 
334 	if (strncmp(table_attr->name, "NULL", 4))
335 		memcpy(name, table_attr->name, ACPI_NAME_SIZE);
336 	else
337 		memcpy(name, "\0\0\0\0", 4);
338 
339 	status = acpi_get_table(name, table_attr->instance, &table_header);
340 	if (ACPI_FAILURE(status))
341 		return -ENODEV;
342 
343 	return memory_read_from_buffer(buf, count, &offset,
344 				       table_header, table_header->length);
345 }
346 
347 static void acpi_table_attr_init(struct acpi_table_attr *table_attr,
348 				 struct acpi_table_header *table_header)
349 {
350 	struct acpi_table_header *header = NULL;
351 	struct acpi_table_attr *attr = NULL;
352 
353 	sysfs_attr_init(&table_attr->attr.attr);
354 	if (table_header->signature[0] != '\0')
355 		memcpy(table_attr->name, table_header->signature,
356 		       ACPI_NAME_SIZE);
357 	else
358 		memcpy(table_attr->name, "NULL", 4);
359 
360 	list_for_each_entry(attr, &acpi_table_attr_list, node) {
361 		if (!memcmp(table_attr->name, attr->name, ACPI_NAME_SIZE))
362 			if (table_attr->instance < attr->instance)
363 				table_attr->instance = attr->instance;
364 	}
365 	table_attr->instance++;
366 
367 	if (table_attr->instance > 1 || (table_attr->instance == 1 &&
368 					 !acpi_get_table
369 					 (table_header->signature, 2, &header)))
370 		sprintf(table_attr->name + ACPI_NAME_SIZE, "%d",
371 			table_attr->instance);
372 
373 	table_attr->attr.size = table_header->length;
374 	table_attr->attr.read = acpi_table_show;
375 	table_attr->attr.attr.name = table_attr->name;
376 	table_attr->attr.attr.mode = 0400;
377 
378 	return;
379 }
380 
381 static acpi_status
382 acpi_sysfs_table_handler(u32 event, void *table, void *context)
383 {
384 	struct acpi_table_attr *table_attr;
385 
386 	switch (event) {
387 	case ACPI_TABLE_EVENT_LOAD:
388 		table_attr =
389 		    kzalloc(sizeof(struct acpi_table_attr), GFP_KERNEL);
390 		if (!table_attr)
391 			return AE_NO_MEMORY;
392 
393 		acpi_table_attr_init(table_attr, table);
394 		if (sysfs_create_bin_file(dynamic_tables_kobj,
395 					  &table_attr->attr)) {
396 			kfree(table_attr);
397 			return AE_ERROR;
398 		} else
399 			list_add_tail(&table_attr->node, &acpi_table_attr_list);
400 		break;
401 	case ACPI_TABLE_EVENT_UNLOAD:
402 		/*
403 		 * we do not need to do anything right now
404 		 * because the table is not deleted from the
405 		 * global table list when unloading it.
406 		 */
407 		break;
408 	default:
409 		return AE_BAD_PARAMETER;
410 	}
411 	return AE_OK;
412 }
413 
414 static int acpi_tables_sysfs_init(void)
415 {
416 	struct acpi_table_attr *table_attr;
417 	struct acpi_table_header *table_header = NULL;
418 	int table_index;
419 	acpi_status status;
420 	int ret;
421 
422 	tables_kobj = kobject_create_and_add("tables", acpi_kobj);
423 	if (!tables_kobj)
424 		goto err;
425 
426 	dynamic_tables_kobj = kobject_create_and_add("dynamic", tables_kobj);
427 	if (!dynamic_tables_kobj)
428 		goto err_dynamic_tables;
429 
430 	for (table_index = 0;; table_index++) {
431 		status = acpi_get_table_by_index(table_index, &table_header);
432 
433 		if (status == AE_BAD_PARAMETER)
434 			break;
435 
436 		if (ACPI_FAILURE(status))
437 			continue;
438 
439 		table_attr = NULL;
440 		table_attr = kzalloc(sizeof(*table_attr), GFP_KERNEL);
441 		if (!table_attr)
442 			return -ENOMEM;
443 
444 		acpi_table_attr_init(table_attr, table_header);
445 		ret = sysfs_create_bin_file(tables_kobj, &table_attr->attr);
446 		if (ret) {
447 			kfree(table_attr);
448 			return ret;
449 		}
450 		list_add_tail(&table_attr->node, &acpi_table_attr_list);
451 	}
452 
453 	kobject_uevent(tables_kobj, KOBJ_ADD);
454 	kobject_uevent(dynamic_tables_kobj, KOBJ_ADD);
455 	status = acpi_install_table_handler(acpi_sysfs_table_handler, NULL);
456 
457 	return ACPI_FAILURE(status) ? -EINVAL : 0;
458 err_dynamic_tables:
459 	kobject_put(tables_kobj);
460 err:
461 	return -ENOMEM;
462 }
463 
464 /*
465  * Detailed ACPI IRQ counters:
466  * /sys/firmware/acpi/interrupts/
467  */
468 
469 u32 acpi_irq_handled;
470 u32 acpi_irq_not_handled;
471 
472 #define COUNT_GPE 0
473 #define COUNT_SCI 1		/* acpi_irq_handled */
474 #define COUNT_SCI_NOT 2		/* acpi_irq_not_handled */
475 #define COUNT_ERROR 3		/* other */
476 #define NUM_COUNTERS_EXTRA 4
477 
478 struct event_counter {
479 	u32 count;
480 	u32 flags;
481 };
482 
483 static struct event_counter *all_counters;
484 static u32 num_gpes;
485 static u32 num_counters;
486 static struct attribute **all_attrs;
487 static u32 acpi_gpe_count;
488 
489 static struct attribute_group interrupt_stats_attr_group = {
490 	.name = "interrupts",
491 };
492 
493 static struct kobj_attribute *counter_attrs;
494 
495 static void delete_gpe_attr_array(void)
496 {
497 	struct event_counter *tmp = all_counters;
498 
499 	all_counters = NULL;
500 	kfree(tmp);
501 
502 	if (counter_attrs) {
503 		int i;
504 
505 		for (i = 0; i < num_gpes; i++)
506 			kfree(counter_attrs[i].attr.name);
507 
508 		kfree(counter_attrs);
509 	}
510 	kfree(all_attrs);
511 
512 	return;
513 }
514 
515 static void gpe_count(u32 gpe_number)
516 {
517 	acpi_gpe_count++;
518 
519 	if (!all_counters)
520 		return;
521 
522 	if (gpe_number < num_gpes)
523 		all_counters[gpe_number].count++;
524 	else
525 		all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS +
526 			     COUNT_ERROR].count++;
527 
528 	return;
529 }
530 
531 static void fixed_event_count(u32 event_number)
532 {
533 	if (!all_counters)
534 		return;
535 
536 	if (event_number < ACPI_NUM_FIXED_EVENTS)
537 		all_counters[num_gpes + event_number].count++;
538 	else
539 		all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS +
540 			     COUNT_ERROR].count++;
541 
542 	return;
543 }
544 
545 static void acpi_global_event_handler(u32 event_type, acpi_handle device,
546 	u32 event_number, void *context)
547 {
548 	if (event_type == ACPI_EVENT_TYPE_GPE)
549 		gpe_count(event_number);
550 
551 	if (event_type == ACPI_EVENT_TYPE_FIXED)
552 		fixed_event_count(event_number);
553 }
554 
555 static int get_status(u32 index, acpi_event_status *status,
556 		      acpi_handle *handle)
557 {
558 	int result = 0;
559 
560 	if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
561 		goto end;
562 
563 	if (index < num_gpes) {
564 		result = acpi_get_gpe_device(index, handle);
565 		if (result) {
566 			ACPI_EXCEPTION((AE_INFO, AE_NOT_FOUND,
567 					"Invalid GPE 0x%x", index));
568 			goto end;
569 		}
570 		result = acpi_get_gpe_status(*handle, index, status);
571 	} else if (index < (num_gpes + ACPI_NUM_FIXED_EVENTS))
572 		result = acpi_get_event_status(index - num_gpes, status);
573 
574 end:
575 	return result;
576 }
577 
578 static ssize_t counter_show(struct kobject *kobj,
579 			    struct kobj_attribute *attr, char *buf)
580 {
581 	int index = attr - counter_attrs;
582 	int size;
583 	acpi_handle handle;
584 	acpi_event_status status;
585 	int result = 0;
586 
587 	all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI].count =
588 	    acpi_irq_handled;
589 	all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT].count =
590 	    acpi_irq_not_handled;
591 	all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE].count =
592 	    acpi_gpe_count;
593 	size = sprintf(buf, "%8u", all_counters[index].count);
594 
595 	/* "gpe_all" or "sci" */
596 	if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
597 		goto end;
598 
599 	result = get_status(index, &status, &handle);
600 	if (result)
601 		goto end;
602 
603 	if (!(status & ACPI_EVENT_FLAG_HAS_HANDLER))
604 		size += sprintf(buf + size, "   invalid");
605 	else if (status & ACPI_EVENT_FLAG_ENABLED)
606 		size += sprintf(buf + size, "   enabled");
607 	else if (status & ACPI_EVENT_FLAG_WAKE_ENABLED)
608 		size += sprintf(buf + size, "   wake_enabled");
609 	else
610 		size += sprintf(buf + size, "   disabled");
611 
612 end:
613 	size += sprintf(buf + size, "\n");
614 	return result ? result : size;
615 }
616 
617 /*
618  * counter_set() sets the specified counter.
619  * setting the total "sci" file to any value clears all counters.
620  * enable/disable/clear a gpe/fixed event in user space.
621  */
622 static ssize_t counter_set(struct kobject *kobj,
623 			   struct kobj_attribute *attr, const char *buf,
624 			   size_t size)
625 {
626 	int index = attr - counter_attrs;
627 	acpi_event_status status;
628 	acpi_handle handle;
629 	int result = 0;
630 	unsigned long tmp;
631 
632 	if (index == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI) {
633 		int i;
634 		for (i = 0; i < num_counters; ++i)
635 			all_counters[i].count = 0;
636 		acpi_gpe_count = 0;
637 		acpi_irq_handled = 0;
638 		acpi_irq_not_handled = 0;
639 		goto end;
640 	}
641 
642 	/* show the event status for both GPEs and Fixed Events */
643 	result = get_status(index, &status, &handle);
644 	if (result)
645 		goto end;
646 
647 	if (!(status & ACPI_EVENT_FLAG_HAS_HANDLER)) {
648 		printk(KERN_WARNING PREFIX
649 		       "Can not change Invalid GPE/Fixed Event status\n");
650 		return -EINVAL;
651 	}
652 
653 	if (index < num_gpes) {
654 		if (!strcmp(buf, "disable\n") &&
655 		    (status & ACPI_EVENT_FLAG_ENABLED))
656 			result = acpi_disable_gpe(handle, index);
657 		else if (!strcmp(buf, "enable\n") &&
658 			 !(status & ACPI_EVENT_FLAG_ENABLED))
659 			result = acpi_enable_gpe(handle, index);
660 		else if (!strcmp(buf, "clear\n") &&
661 			 (status & ACPI_EVENT_FLAG_SET))
662 			result = acpi_clear_gpe(handle, index);
663 		else if (!kstrtoul(buf, 0, &tmp))
664 			all_counters[index].count = tmp;
665 		else
666 			result = -EINVAL;
667 	} else if (index < num_gpes + ACPI_NUM_FIXED_EVENTS) {
668 		int event = index - num_gpes;
669 		if (!strcmp(buf, "disable\n") &&
670 		    (status & ACPI_EVENT_FLAG_ENABLED))
671 			result = acpi_disable_event(event, ACPI_NOT_ISR);
672 		else if (!strcmp(buf, "enable\n") &&
673 			 !(status & ACPI_EVENT_FLAG_ENABLED))
674 			result = acpi_enable_event(event, ACPI_NOT_ISR);
675 		else if (!strcmp(buf, "clear\n") &&
676 			 (status & ACPI_EVENT_FLAG_SET))
677 			result = acpi_clear_event(event);
678 		else if (!kstrtoul(buf, 0, &tmp))
679 			all_counters[index].count = tmp;
680 		else
681 			result = -EINVAL;
682 	} else
683 		all_counters[index].count = strtoul(buf, NULL, 0);
684 
685 	if (ACPI_FAILURE(result))
686 		result = -EINVAL;
687 end:
688 	return result ? result : size;
689 }
690 
691 void acpi_irq_stats_init(void)
692 {
693 	acpi_status status;
694 	int i;
695 
696 	if (all_counters)
697 		return;
698 
699 	num_gpes = acpi_current_gpe_count;
700 	num_counters = num_gpes + ACPI_NUM_FIXED_EVENTS + NUM_COUNTERS_EXTRA;
701 
702 	all_attrs = kzalloc(sizeof(struct attribute *) * (num_counters + 1),
703 			    GFP_KERNEL);
704 	if (all_attrs == NULL)
705 		return;
706 
707 	all_counters = kzalloc(sizeof(struct event_counter) * (num_counters),
708 			       GFP_KERNEL);
709 	if (all_counters == NULL)
710 		goto fail;
711 
712 	status = acpi_install_global_event_handler(acpi_global_event_handler, NULL);
713 	if (ACPI_FAILURE(status))
714 		goto fail;
715 
716 	counter_attrs = kzalloc(sizeof(struct kobj_attribute) * (num_counters),
717 				GFP_KERNEL);
718 	if (counter_attrs == NULL)
719 		goto fail;
720 
721 	for (i = 0; i < num_counters; ++i) {
722 		char buffer[12];
723 		char *name;
724 
725 		if (i < num_gpes)
726 			sprintf(buffer, "gpe%02X", i);
727 		else if (i == num_gpes + ACPI_EVENT_PMTIMER)
728 			sprintf(buffer, "ff_pmtimer");
729 		else if (i == num_gpes + ACPI_EVENT_GLOBAL)
730 			sprintf(buffer, "ff_gbl_lock");
731 		else if (i == num_gpes + ACPI_EVENT_POWER_BUTTON)
732 			sprintf(buffer, "ff_pwr_btn");
733 		else if (i == num_gpes + ACPI_EVENT_SLEEP_BUTTON)
734 			sprintf(buffer, "ff_slp_btn");
735 		else if (i == num_gpes + ACPI_EVENT_RTC)
736 			sprintf(buffer, "ff_rt_clk");
737 		else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE)
738 			sprintf(buffer, "gpe_all");
739 		else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI)
740 			sprintf(buffer, "sci");
741 		else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT)
742 			sprintf(buffer, "sci_not");
743 		else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR)
744 			sprintf(buffer, "error");
745 		else
746 			sprintf(buffer, "bug%02X", i);
747 
748 		name = kstrdup(buffer, GFP_KERNEL);
749 		if (name == NULL)
750 			goto fail;
751 
752 		sysfs_attr_init(&counter_attrs[i].attr);
753 		counter_attrs[i].attr.name = name;
754 		counter_attrs[i].attr.mode = 0644;
755 		counter_attrs[i].show = counter_show;
756 		counter_attrs[i].store = counter_set;
757 
758 		all_attrs[i] = &counter_attrs[i].attr;
759 	}
760 
761 	interrupt_stats_attr_group.attrs = all_attrs;
762 	if (!sysfs_create_group(acpi_kobj, &interrupt_stats_attr_group))
763 		return;
764 
765 fail:
766 	delete_gpe_attr_array();
767 	return;
768 }
769 
770 static void __exit interrupt_stats_exit(void)
771 {
772 	sysfs_remove_group(acpi_kobj, &interrupt_stats_attr_group);
773 
774 	delete_gpe_attr_array();
775 
776 	return;
777 }
778 
779 static ssize_t
780 acpi_show_profile(struct device *dev, struct device_attribute *attr,
781 		  char *buf)
782 {
783 	return sprintf(buf, "%d\n", acpi_gbl_FADT.preferred_profile);
784 }
785 
786 static const struct device_attribute pm_profile_attr =
787 	__ATTR(pm_profile, S_IRUGO, acpi_show_profile, NULL);
788 
789 static ssize_t hotplug_enabled_show(struct kobject *kobj,
790 				    struct kobj_attribute *attr, char *buf)
791 {
792 	struct acpi_hotplug_profile *hotplug = to_acpi_hotplug_profile(kobj);
793 
794 	return sprintf(buf, "%d\n", hotplug->enabled);
795 }
796 
797 static ssize_t hotplug_enabled_store(struct kobject *kobj,
798 				     struct kobj_attribute *attr,
799 				     const char *buf, size_t size)
800 {
801 	struct acpi_hotplug_profile *hotplug = to_acpi_hotplug_profile(kobj);
802 	unsigned int val;
803 
804 	if (kstrtouint(buf, 10, &val) || val > 1)
805 		return -EINVAL;
806 
807 	acpi_scan_hotplug_enabled(hotplug, val);
808 	return size;
809 }
810 
811 static struct kobj_attribute hotplug_enabled_attr =
812 	__ATTR(enabled, S_IRUGO | S_IWUSR, hotplug_enabled_show,
813 		hotplug_enabled_store);
814 
815 static struct attribute *hotplug_profile_attrs[] = {
816 	&hotplug_enabled_attr.attr,
817 	NULL
818 };
819 
820 static struct kobj_type acpi_hotplug_profile_ktype = {
821 	.sysfs_ops = &kobj_sysfs_ops,
822 	.default_attrs = hotplug_profile_attrs,
823 };
824 
825 void acpi_sysfs_add_hotplug_profile(struct acpi_hotplug_profile *hotplug,
826 				    const char *name)
827 {
828 	int error;
829 
830 	if (!hotplug_kobj)
831 		goto err_out;
832 
833 	error = kobject_init_and_add(&hotplug->kobj,
834 		&acpi_hotplug_profile_ktype, hotplug_kobj, "%s", name);
835 	if (error)
836 		goto err_out;
837 
838 	kobject_uevent(&hotplug->kobj, KOBJ_ADD);
839 	return;
840 
841  err_out:
842 	pr_err(PREFIX "Unable to add hotplug profile '%s'\n", name);
843 }
844 
845 static ssize_t force_remove_show(struct kobject *kobj,
846 				 struct kobj_attribute *attr, char *buf)
847 {
848 	return sprintf(buf, "%d\n", !!acpi_force_hot_remove);
849 }
850 
851 static ssize_t force_remove_store(struct kobject *kobj,
852 				  struct kobj_attribute *attr,
853 				  const char *buf, size_t size)
854 {
855 	bool val;
856 	int ret;
857 
858 	ret = strtobool(buf, &val);
859 	if (ret < 0)
860 		return ret;
861 
862 	lock_device_hotplug();
863 	acpi_force_hot_remove = val;
864 	unlock_device_hotplug();
865 	return size;
866 }
867 
868 static const struct kobj_attribute force_remove_attr =
869 	__ATTR(force_remove, S_IRUGO | S_IWUSR, force_remove_show,
870 	       force_remove_store);
871 
872 int __init acpi_sysfs_init(void)
873 {
874 	int result;
875 
876 	result = acpi_tables_sysfs_init();
877 	if (result)
878 		return result;
879 
880 	hotplug_kobj = kobject_create_and_add("hotplug", acpi_kobj);
881 	if (!hotplug_kobj)
882 		return -ENOMEM;
883 
884 	result = sysfs_create_file(hotplug_kobj, &force_remove_attr.attr);
885 	if (result)
886 		return result;
887 
888 	result = sysfs_create_file(acpi_kobj, &pm_profile_attr.attr);
889 	return result;
890 }
891