?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
powercap: restrict energy meter to root access
[linux/fpc-iii.git] / drivers / acpi / sysfs.c
blob764786cfb0d945fb7d3383fb73b986733d7fa7bf
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 #define ACPI_MAX_TABLE_INSTANCES 999
318 #define ACPI_INST_SIZE 4 /* including trailing 0 */
319
320 struct acpi_table_attr {
321 struct bin_attribute attr;
322 char name[ACPI_NAME_SIZE];
323 int instance;
324 char filename[ACPI_NAME_SIZE+ACPI_INST_SIZE];
325 struct list_head node;
326 };
327
328 static ssize_t acpi_table_show(struct file *filp, struct kobject *kobj,
329 struct bin_attribute *bin_attr, char *buf,
330 loff_t offset, size_t count)
331 {
332 struct acpi_table_attr *table_attr =
333 container_of(bin_attr, struct acpi_table_attr, attr);
334 struct acpi_table_header *table_header = NULL;
335 acpi_status status;
336
337 status = acpi_get_table(table_attr->name, table_attr->instance,
338 &table_header);
339 if (ACPI_FAILURE(status))
340 return -ENODEV;
341
342 return memory_read_from_buffer(buf, count, &offset,
343 table_header, table_header->length);
344 }
345
346 static int acpi_table_attr_init(struct kobject *tables_obj,
347 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 char instance_str[ACPI_INST_SIZE];
353
354 sysfs_attr_init(&table_attr->attr.attr);
355 ACPI_MOVE_NAME(table_attr->name, table_header->signature);
356
357 list_for_each_entry(attr, &acpi_table_attr_list, node) {
358 if (ACPI_COMPARE_NAME(table_attr->name, attr->name))
359 if (table_attr->instance < attr->instance)
360 table_attr->instance = attr->instance;
361 }
362 table_attr->instance++;
363 if (table_attr->instance > ACPI_MAX_TABLE_INSTANCES) {
364 pr_warn("%4.4s: too many table instances\n",
365 table_attr->name);
366 return -ERANGE;
367 }
368
369 ACPI_MOVE_NAME(table_attr->filename, table_header->signature);
370 table_attr->filename[ACPI_NAME_SIZE] = '\0';
371 if (table_attr->instance > 1 || (table_attr->instance == 1 &&
372 !acpi_get_table
373 (table_header->signature, 2, &header))) {
374 snprintf(instance_str, sizeof(instance_str), "%u",
375 table_attr->instance);
376 strcat(table_attr->filename, instance_str);
377 }
378
379 table_attr->attr.size = table_header->length;
380 table_attr->attr.read = acpi_table_show;
381 table_attr->attr.attr.name = table_attr->filename;
382 table_attr->attr.attr.mode = 0400;
383
384 return sysfs_create_bin_file(tables_obj, &table_attr->attr);
385 }
386
387 acpi_status acpi_sysfs_table_handler(u32 event, void *table, void *context)
388 {
389 struct acpi_table_attr *table_attr;
390
391 switch (event) {
392 case ACPI_TABLE_EVENT_INSTALL:
393 table_attr =
394 kzalloc(sizeof(struct acpi_table_attr), GFP_KERNEL);
395 if (!table_attr)
396 return AE_NO_MEMORY;
397
398 if (acpi_table_attr_init(dynamic_tables_kobj,
399 table_attr, table)) {
400 kfree(table_attr);
401 return AE_ERROR;
402 }
403 list_add_tail(&table_attr->node, &acpi_table_attr_list);
404 break;
405 case ACPI_TABLE_EVENT_LOAD:
406 case ACPI_TABLE_EVENT_UNLOAD:
407 case ACPI_TABLE_EVENT_UNINSTALL:
408 /*
409 * we do not need to do anything right now
410 * because the table is not deleted from the
411 * global table list when unloading it.
412 */
413 break;
414 default:
415 return AE_BAD_PARAMETER;
416 }
417 return AE_OK;
418 }
419
420 static int acpi_tables_sysfs_init(void)
421 {
422 struct acpi_table_attr *table_attr;
423 struct acpi_table_header *table_header = NULL;
424 int table_index;
425 acpi_status status;
426 int ret;
427
428 tables_kobj = kobject_create_and_add("tables", acpi_kobj);
429 if (!tables_kobj)
430 goto err;
431
432 dynamic_tables_kobj = kobject_create_and_add("dynamic", tables_kobj);
433 if (!dynamic_tables_kobj)
434 goto err_dynamic_tables;
435
436 for (table_index = 0;; table_index++) {
437 status = acpi_get_table_by_index(table_index, &table_header);
438
439 if (status == AE_BAD_PARAMETER)
440 break;
441
442 if (ACPI_FAILURE(status))
443 continue;
444
445 table_attr = kzalloc(sizeof(*table_attr), GFP_KERNEL);
446 if (!table_attr)
447 return -ENOMEM;
448
449 ret = acpi_table_attr_init(tables_kobj,
450 table_attr, table_header);
451 if (ret) {
452 kfree(table_attr);
453 return ret;
454 }
455 list_add_tail(&table_attr->node, &acpi_table_attr_list);
456 }
457
458 kobject_uevent(tables_kobj, KOBJ_ADD);
459 kobject_uevent(dynamic_tables_kobj, KOBJ_ADD);
460
461 return 0;
462 err_dynamic_tables:
463 kobject_put(tables_kobj);
464 err:
465 return -ENOMEM;
466 }
467
468 /*
469 * Detailed ACPI IRQ counters:
470 * /sys/firmware/acpi/interrupts/
471 */
472
473 u32 acpi_irq_handled;
474 u32 acpi_irq_not_handled;
475
476 #define COUNT_GPE 0
477 #define COUNT_SCI 1 /* acpi_irq_handled */
478 #define COUNT_SCI_NOT 2 /* acpi_irq_not_handled */
479 #define COUNT_ERROR 3 /* other */
480 #define NUM_COUNTERS_EXTRA 4
481
482 struct event_counter {
483 u32 count;
484 u32 flags;
485 };
486
487 static struct event_counter *all_counters;
488 static u32 num_gpes;
489 static u32 num_counters;
490 static struct attribute **all_attrs;
491 static u32 acpi_gpe_count;
492
493 static struct attribute_group interrupt_stats_attr_group = {
494 .name = "interrupts",
495 };
496
497 static struct kobj_attribute *counter_attrs;
498
499 static void delete_gpe_attr_array(void)
500 {
501 struct event_counter *tmp = all_counters;
502
503 all_counters = NULL;
504 kfree(tmp);
505
506 if (counter_attrs) {
507 int i;
508
509 for (i = 0; i < num_gpes; i++)
510 kfree(counter_attrs[i].attr.name);
511
512 kfree(counter_attrs);
513 }
514 kfree(all_attrs);
515
516 return;
517 }
518
519 static void gpe_count(u32 gpe_number)
520 {
521 acpi_gpe_count++;
522
523 if (!all_counters)
524 return;
525
526 if (gpe_number < num_gpes)
527 all_counters[gpe_number].count++;
528 else
529 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS +
530 COUNT_ERROR].count++;
531
532 return;
533 }
534
535 static void fixed_event_count(u32 event_number)
536 {
537 if (!all_counters)
538 return;
539
540 if (event_number < ACPI_NUM_FIXED_EVENTS)
541 all_counters[num_gpes + event_number].count++;
542 else
543 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS +
544 COUNT_ERROR].count++;
545
546 return;
547 }
548
549 static void acpi_global_event_handler(u32 event_type, acpi_handle device,
550 u32 event_number, void *context)
551 {
552 if (event_type == ACPI_EVENT_TYPE_GPE)
553 gpe_count(event_number);
554
555 if (event_type == ACPI_EVENT_TYPE_FIXED)
556 fixed_event_count(event_number);
557 }
558
559 static int get_status(u32 index, acpi_event_status *status,
560 acpi_handle *handle)
561 {
562 int result;
563
564 if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
565 return -EINVAL;
566
567 if (index < num_gpes) {
568 result = acpi_get_gpe_device(index, handle);
569 if (result) {
570 ACPI_EXCEPTION((AE_INFO, AE_NOT_FOUND,
571 "Invalid GPE 0x%x", index));
572 return result;
573 }
574 result = acpi_get_gpe_status(*handle, index, status);
575 } else if (index < (num_gpes + ACPI_NUM_FIXED_EVENTS))
576 result = acpi_get_event_status(index - num_gpes, status);
577
578 return result;
579 }
580
581 static ssize_t counter_show(struct kobject *kobj,
582 struct kobj_attribute *attr, char *buf)
583 {
584 int index = attr - counter_attrs;
585 int size;
586 acpi_handle handle;
587 acpi_event_status status;
588 int result = 0;
589
590 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI].count =
591 acpi_irq_handled;
592 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT].count =
593 acpi_irq_not_handled;
594 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE].count =
595 acpi_gpe_count;
596 size = sprintf(buf, "%8u", all_counters[index].count);
597
598 /* "gpe_all" or "sci" */
599 if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
600 goto end;
601
602 result = get_status(index, &status, &handle);
603 if (result)
604 goto end;
605
606 if (status & ACPI_EVENT_FLAG_ENABLE_SET)
607 size += sprintf(buf + size, " EN");
608 else
609 size += sprintf(buf + size, " ");
610 if (status & ACPI_EVENT_FLAG_STATUS_SET)
611 size += sprintf(buf + size, " STS");
612 else
613 size += sprintf(buf + size, " ");
614
615 if (!(status & ACPI_EVENT_FLAG_HAS_HANDLER))
616 size += sprintf(buf + size, " invalid ");
617 else if (status & ACPI_EVENT_FLAG_ENABLED)
618 size += sprintf(buf + size, " enabled ");
619 else if (status & ACPI_EVENT_FLAG_WAKE_ENABLED)
620 size += sprintf(buf + size, " wake_enabled");
621 else
622 size += sprintf(buf + size, " disabled ");
623 if (status & ACPI_EVENT_FLAG_MASKED)
624 size += sprintf(buf + size, " masked ");
625 else
626 size += sprintf(buf + size, " unmasked");
627
628 end:
629 size += sprintf(buf + size, "\n");
630 return result ? result : size;
631 }
632
633 /*
634 * counter_set() sets the specified counter.
635 * setting the total "sci" file to any value clears all counters.
636 * enable/disable/clear a gpe/fixed event in user space.
637 */
638 static ssize_t counter_set(struct kobject *kobj,
639 struct kobj_attribute *attr, const char *buf,
640 size_t size)
641 {
642 int index = attr - counter_attrs;
643 acpi_event_status status;
644 acpi_handle handle;
645 int result = 0;
646 unsigned long tmp;
647
648 if (index == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI) {
649 int i;
650 for (i = 0; i < num_counters; ++i)
651 all_counters[i].count = 0;
652 acpi_gpe_count = 0;
653 acpi_irq_handled = 0;
654 acpi_irq_not_handled = 0;
655 goto end;
656 }
657
658 /* show the event status for both GPEs and Fixed Events */
659 result = get_status(index, &status, &handle);
660 if (result)
661 goto end;
662
663 if (!(status & ACPI_EVENT_FLAG_HAS_HANDLER)) {
664 printk(KERN_WARNING PREFIX
665 "Can not change Invalid GPE/Fixed Event status\n");
666 return -EINVAL;
667 }
668
669 if (index < num_gpes) {
670 if (!strcmp(buf, "disable\n") &&
671 (status & ACPI_EVENT_FLAG_ENABLED))
672 result = acpi_disable_gpe(handle, index);
673 else if (!strcmp(buf, "enable\n") &&
674 !(status & ACPI_EVENT_FLAG_ENABLED))
675 result = acpi_enable_gpe(handle, index);
676 else if (!strcmp(buf, "clear\n") &&
677 (status & ACPI_EVENT_FLAG_STATUS_SET))
678 result = acpi_clear_gpe(handle, index);
679 else if (!strcmp(buf, "mask\n"))
680 result = acpi_mask_gpe(handle, index, TRUE);
681 else if (!strcmp(buf, "unmask\n"))
682 result = acpi_mask_gpe(handle, index, FALSE);
683 else if (!kstrtoul(buf, 0, &tmp))
684 all_counters[index].count = tmp;
685 else
686 result = -EINVAL;
687 } else if (index < num_gpes + ACPI_NUM_FIXED_EVENTS) {
688 int event = index - num_gpes;
689 if (!strcmp(buf, "disable\n") &&
690 (status & ACPI_EVENT_FLAG_ENABLE_SET))
691 result = acpi_disable_event(event, ACPI_NOT_ISR);
692 else if (!strcmp(buf, "enable\n") &&
693 !(status & ACPI_EVENT_FLAG_ENABLE_SET))
694 result = acpi_enable_event(event, ACPI_NOT_ISR);
695 else if (!strcmp(buf, "clear\n") &&
696 (status & ACPI_EVENT_FLAG_STATUS_SET))
697 result = acpi_clear_event(event);
698 else if (!kstrtoul(buf, 0, &tmp))
699 all_counters[index].count = tmp;
700 else
701 result = -EINVAL;
702 } else
703 all_counters[index].count = strtoul(buf, NULL, 0);
704
705 if (ACPI_FAILURE(result))
706 result = -EINVAL;
707 end:
708 return result ? result : size;
709 }
710
711 /*
712 * A Quirk Mechanism for GPE Flooding Prevention:
713 *
714 * Quirks may be needed to prevent GPE flooding on a specific GPE. The
715 * flooding typically cannot be detected and automatically prevented by
716 * ACPI_GPE_DISPATCH_NONE check because there is a _Lxx/_Exx prepared in
717 * the AML tables. This normally indicates a feature gap in Linux, thus
718 * instead of providing endless quirk tables, we provide a boot parameter
719 * for those who want this quirk. For example, if the users want to prevent
720 * the GPE flooding for GPE 00, they need to specify the following boot
721 * parameter:
722 * acpi_mask_gpe=0x00
723 * The masking status can be modified by the following runtime controlling
724 * interface:
725 * echo unmask > /sys/firmware/acpi/interrupts/gpe00
726 */
727 #define ACPI_MASKABLE_GPE_MAX 0xFF
728 static DECLARE_BITMAP(acpi_masked_gpes_map, ACPI_MASKABLE_GPE_MAX) __initdata;
729
730 static int __init acpi_gpe_set_masked_gpes(char *val)
731 {
732 u8 gpe;
733
734 if (kstrtou8(val, 0, &gpe) || gpe > ACPI_MASKABLE_GPE_MAX)
735 return -EINVAL;
736 set_bit(gpe, acpi_masked_gpes_map);
737
738 return 1;
739 }
740 __setup("acpi_mask_gpe=", acpi_gpe_set_masked_gpes);
741
742 void __init acpi_gpe_apply_masked_gpes(void)
743 {
744 acpi_handle handle;
745 acpi_status status;
746 u8 gpe;
747
748 for_each_set_bit(gpe, acpi_masked_gpes_map, ACPI_MASKABLE_GPE_MAX) {
749 status = acpi_get_gpe_device(gpe, &handle);
750 if (ACPI_SUCCESS(status)) {
751 pr_info("Masking GPE 0x%x.\n", gpe);
752 (void)acpi_mask_gpe(handle, gpe, TRUE);
753 }
754 }
755 }
756
757 void acpi_irq_stats_init(void)
758 {
759 acpi_status status;
760 int i;
761
762 if (all_counters)
763 return;
764
765 num_gpes = acpi_current_gpe_count;
766 num_counters = num_gpes + ACPI_NUM_FIXED_EVENTS + NUM_COUNTERS_EXTRA;
767
768 all_attrs = kzalloc(sizeof(struct attribute *) * (num_counters + 1),
769 GFP_KERNEL);
770 if (all_attrs == NULL)
771 return;
772
773 all_counters = kzalloc(sizeof(struct event_counter) * (num_counters),
774 GFP_KERNEL);
775 if (all_counters == NULL)
776 goto fail;
777
778 status = acpi_install_global_event_handler(acpi_global_event_handler, NULL);
779 if (ACPI_FAILURE(status))
780 goto fail;
781
782 counter_attrs = kzalloc(sizeof(struct kobj_attribute) * (num_counters),
783 GFP_KERNEL);
784 if (counter_attrs == NULL)
785 goto fail;
786
787 for (i = 0; i < num_counters; ++i) {
788 char buffer[12];
789 char *name;
790
791 if (i < num_gpes)
792 sprintf(buffer, "gpe%02X", i);
793 else if (i == num_gpes + ACPI_EVENT_PMTIMER)
794 sprintf(buffer, "ff_pmtimer");
795 else if (i == num_gpes + ACPI_EVENT_GLOBAL)
796 sprintf(buffer, "ff_gbl_lock");
797 else if (i == num_gpes + ACPI_EVENT_POWER_BUTTON)
798 sprintf(buffer, "ff_pwr_btn");
799 else if (i == num_gpes + ACPI_EVENT_SLEEP_BUTTON)
800 sprintf(buffer, "ff_slp_btn");
801 else if (i == num_gpes + ACPI_EVENT_RTC)
802 sprintf(buffer, "ff_rt_clk");
803 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE)
804 sprintf(buffer, "gpe_all");
805 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI)
806 sprintf(buffer, "sci");
807 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT)
808 sprintf(buffer, "sci_not");
809 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR)
810 sprintf(buffer, "error");
811 else
812 sprintf(buffer, "bug%02X", i);
813
814 name = kstrdup(buffer, GFP_KERNEL);
815 if (name == NULL)
816 goto fail;
817
818 sysfs_attr_init(&counter_attrs[i].attr);
819 counter_attrs[i].attr.name = name;
820 counter_attrs[i].attr.mode = 0644;
821 counter_attrs[i].show = counter_show;
822 counter_attrs[i].store = counter_set;
823
824 all_attrs[i] = &counter_attrs[i].attr;
825 }
826
827 interrupt_stats_attr_group.attrs = all_attrs;
828 if (!sysfs_create_group(acpi_kobj, &interrupt_stats_attr_group))
829 return;
830
831 fail:
832 delete_gpe_attr_array();
833 return;
834 }
835
836 static void __exit interrupt_stats_exit(void)
837 {
838 sysfs_remove_group(acpi_kobj, &interrupt_stats_attr_group);
839
840 delete_gpe_attr_array();
841
842 return;
843 }
844
845 static ssize_t
846 acpi_show_profile(struct kobject *kobj, struct kobj_attribute *attr,
847 char *buf)
848 {
849 return sprintf(buf, "%d\n", acpi_gbl_FADT.preferred_profile);
850 }
851
852 static const struct kobj_attribute pm_profile_attr =
853 __ATTR(pm_profile, S_IRUGO, acpi_show_profile, NULL);
854
855 static ssize_t hotplug_enabled_show(struct kobject *kobj,
856 struct kobj_attribute *attr, char *buf)
857 {
858 struct acpi_hotplug_profile *hotplug = to_acpi_hotplug_profile(kobj);
859
860 return sprintf(buf, "%d\n", hotplug->enabled);
861 }
862
863 static ssize_t hotplug_enabled_store(struct kobject *kobj,
864 struct kobj_attribute *attr,
865 const char *buf, size_t size)
866 {
867 struct acpi_hotplug_profile *hotplug = to_acpi_hotplug_profile(kobj);
868 unsigned int val;
869
870 if (kstrtouint(buf, 10, &val) || val > 1)
871 return -EINVAL;
872
873 acpi_scan_hotplug_enabled(hotplug, val);
874 return size;
875 }
876
877 static struct kobj_attribute hotplug_enabled_attr =
878 __ATTR(enabled, S_IRUGO | S_IWUSR, hotplug_enabled_show,
879 hotplug_enabled_store);
880
881 static struct attribute *hotplug_profile_attrs[] = {
882 &hotplug_enabled_attr.attr,
883 NULL
884 };
885
886 static struct kobj_type acpi_hotplug_profile_ktype = {
887 .sysfs_ops = &kobj_sysfs_ops,
888 .default_attrs = hotplug_profile_attrs,
889 };
890
891 void acpi_sysfs_add_hotplug_profile(struct acpi_hotplug_profile *hotplug,
892 const char *name)
893 {
894 int error;
895
896 if (!hotplug_kobj)
897 goto err_out;
898
899 error = kobject_init_and_add(&hotplug->kobj,
900 &acpi_hotplug_profile_ktype, hotplug_kobj, "%s", name);
901 if (error) {
902 kobject_put(&hotplug->kobj);
903 goto err_out;
904 }
905
906 kobject_uevent(&hotplug->kobj, KOBJ_ADD);
907 return;
908
909 err_out:
910 pr_err(PREFIX "Unable to add hotplug profile '%s'\n", name);
911 }
912
913 static ssize_t force_remove_show(struct kobject *kobj,
914 struct kobj_attribute *attr, char *buf)
915 {
916 return sprintf(buf, "%d\n", !!acpi_force_hot_remove);
917 }
918
919 static ssize_t force_remove_store(struct kobject *kobj,
920 struct kobj_attribute *attr,
921 const char *buf, size_t size)
922 {
923 bool val;
924 int ret;
925
926 ret = strtobool(buf, &val);
927 if (ret < 0)
928 return ret;
929
930 lock_device_hotplug();
931 acpi_force_hot_remove = val;
932 unlock_device_hotplug();
933 return size;
934 }
935
936 static const struct kobj_attribute force_remove_attr =
937 __ATTR(force_remove, S_IRUGO | S_IWUSR, force_remove_show,
938 force_remove_store);
939
940 int __init acpi_sysfs_init(void)
941 {
942 int result;
943
944 result = acpi_tables_sysfs_init();
945 if (result)
946 return result;
947
948 hotplug_kobj = kobject_create_and_add("hotplug", acpi_kobj);
949 if (!hotplug_kobj)
950 return -ENOMEM;
951
952 result = sysfs_create_file(hotplug_kobj, &force_remove_attr.attr);
953 if (result)
954 return result;
955
956 result = sysfs_create_file(acpi_kobj, &pm_profile_attr.attr);
957 return result;
958 }
Linux with added FPC-III support