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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#define _COMPONENT ACPI_SYSTEM_COMPONENT
11ACPI_MODULE_NAME("sysfs");
12
13#define PREFIX "ACPI: "
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
26struct acpi_dlayer {
27 const char *name;
28 unsigned long value;
29};
30struct acpi_dlevel {
31 const char *name;
32 unsigned long value;
33};
34#define ACPI_DEBUG_INIT(v) { .name = #v, .value = v }
35
36static 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
68static 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
73 ACPI_DEBUG_INIT(ACPI_LV_INIT_NAMES),
74 ACPI_DEBUG_INIT(ACPI_LV_PARSE),
75 ACPI_DEBUG_INIT(ACPI_LV_LOAD),
76 ACPI_DEBUG_INIT(ACPI_LV_DISPATCH),
77 ACPI_DEBUG_INIT(ACPI_LV_EXEC),
78 ACPI_DEBUG_INIT(ACPI_LV_NAMES),
79 ACPI_DEBUG_INIT(ACPI_LV_OPREGION),
80 ACPI_DEBUG_INIT(ACPI_LV_BFIELD),
81 ACPI_DEBUG_INIT(ACPI_LV_TABLES),
82 ACPI_DEBUG_INIT(ACPI_LV_VALUES),
83 ACPI_DEBUG_INIT(ACPI_LV_OBJECTS),
84 ACPI_DEBUG_INIT(ACPI_LV_RESOURCES),
85 ACPI_DEBUG_INIT(ACPI_LV_USER_REQUESTS),
86 ACPI_DEBUG_INIT(ACPI_LV_PACKAGE),
87
88 ACPI_DEBUG_INIT(ACPI_LV_ALLOCATIONS),
89 ACPI_DEBUG_INIT(ACPI_LV_FUNCTIONS),
90 ACPI_DEBUG_INIT(ACPI_LV_OPTIMIZATIONS),
91
92 ACPI_DEBUG_INIT(ACPI_LV_MUTEX),
93 ACPI_DEBUG_INIT(ACPI_LV_THREADS),
94 ACPI_DEBUG_INIT(ACPI_LV_IO),
95 ACPI_DEBUG_INIT(ACPI_LV_INTERRUPTS),
96
97 ACPI_DEBUG_INIT(ACPI_LV_AML_DISASSEMBLE),
98 ACPI_DEBUG_INIT(ACPI_LV_VERBOSE_INFO),
99 ACPI_DEBUG_INIT(ACPI_LV_FULL_TABLES),
100 ACPI_DEBUG_INIT(ACPI_LV_EVENTS),
101};
102
103static int param_get_debug_layer(char *buffer, const struct kernel_param *kp)
104{
105 int result = 0;
106 int i;
107
108 result = sprintf(buffer, "%-25s\tHex SET\n", "Description");
109
110 for (i = 0; i < ARRAY_SIZE(acpi_debug_layers); i++) {
111 result += sprintf(buffer + result, "%-25s\t0x%08lX [%c]\n",
112 acpi_debug_layers[i].name,
113 acpi_debug_layers[i].value,
114 (acpi_dbg_layer & acpi_debug_layers[i].value)
115 ? '*' : ' ');
116 }
117 result +=
118 sprintf(buffer + result, "%-25s\t0x%08X [%c]\n", "ACPI_ALL_DRIVERS",
119 ACPI_ALL_DRIVERS,
120 (acpi_dbg_layer & ACPI_ALL_DRIVERS) ==
121 ACPI_ALL_DRIVERS ? '*' : (acpi_dbg_layer & ACPI_ALL_DRIVERS)
122 == 0 ? ' ' : '-');
123 result +=
124 sprintf(buffer + result,
125 "--\ndebug_layer = 0x%08X ( * = enabled)\n",
126 acpi_dbg_layer);
127
128 return result;
129}
130
131static int param_get_debug_level(char *buffer, const struct kernel_param *kp)
132{
133 int result = 0;
134 int i;
135
136 result = sprintf(buffer, "%-25s\tHex SET\n", "Description");
137
138 for (i = 0; i < ARRAY_SIZE(acpi_debug_levels); i++) {
139 result += sprintf(buffer + result, "%-25s\t0x%08lX [%c]\n",
140 acpi_debug_levels[i].name,
141 acpi_debug_levels[i].value,
142 (acpi_dbg_level & acpi_debug_levels[i].value)
143 ? '*' : ' ');
144 }
145 result +=
146 sprintf(buffer + result, "--\ndebug_level = 0x%08X (* = enabled)\n",
147 acpi_dbg_level);
148
149 return result;
150}
151
152static const struct kernel_param_ops param_ops_debug_layer = {
153 .set = param_set_uint,
154 .get = param_get_debug_layer,
155};
156
157static const struct kernel_param_ops param_ops_debug_level = {
158 .set = param_set_uint,
159 .get = param_get_debug_level,
160};
161
162module_param_cb(debug_layer, ¶m_ops_debug_layer, &acpi_dbg_layer, 0644);
163module_param_cb(debug_level, ¶m_ops_debug_level, &acpi_dbg_level, 0644);
164
165static char trace_method_name[6];
166module_param_string(trace_method_name, trace_method_name, 6, 0644);
167static unsigned int trace_debug_layer;
168module_param(trace_debug_layer, uint, 0644);
169static unsigned int trace_debug_level;
170module_param(trace_debug_level, uint, 0644);
171
172static int param_set_trace_state(const char *val, struct kernel_param *kp)
173{
174 int result = 0;
175
176 if (!strncmp(val, "enable", strlen("enable"))) {
177 result = acpi_debug_trace(trace_method_name, trace_debug_level,
178 trace_debug_layer, 0);
179 if (result)
180 result = -EBUSY;
181 goto exit;
182 }
183
184 if (!strncmp(val, "disable", strlen("disable"))) {
185 int name = 0;
186 result = acpi_debug_trace((char *)&name, trace_debug_level,
187 trace_debug_layer, 0);
188 if (result)
189 result = -EBUSY;
190 goto exit;
191 }
192
193 if (!strncmp(val, "1", 1)) {
194 result = acpi_debug_trace(trace_method_name, trace_debug_level,
195 trace_debug_layer, 1);
196 if (result)
197 result = -EBUSY;
198 goto exit;
199 }
200
201 result = -EINVAL;
202exit:
203 return result;
204}
205
206static int param_get_trace_state(char *buffer, struct kernel_param *kp)
207{
208 if (!acpi_gbl_trace_method_name)
209 return sprintf(buffer, "disable");
210 else {
211 if (acpi_gbl_trace_flags & 1)
212 return sprintf(buffer, "1");
213 else
214 return sprintf(buffer, "enable");
215 }
216 return 0;
217}
218
219module_param_call(trace_state, param_set_trace_state, param_get_trace_state,
220 NULL, 0644);
221#endif /* CONFIG_ACPI_DEBUG */
222
223
224/* /sys/modules/acpi/parameters/aml_debug_output */
225
226module_param_named(aml_debug_output, acpi_gbl_enable_aml_debug_object,
227 bool, 0644);
228MODULE_PARM_DESC(aml_debug_output,
229 "To enable/disable the ACPI Debug Object output.");
230
231/* /sys/module/acpi/parameters/acpica_version */
232static int param_get_acpica_version(char *buffer, struct kernel_param *kp)
233{
234 int result;
235
236 result = sprintf(buffer, "%x", ACPI_CA_VERSION);
237
238 return result;
239}
240
241module_param_call(acpica_version, NULL, param_get_acpica_version, NULL, 0444);
242
243/*
244 * ACPI table sysfs I/F:
245 * /sys/firmware/acpi/tables/
246 * /sys/firmware/acpi/tables/dynamic/
247 */
248
249static LIST_HEAD(acpi_table_attr_list);
250static struct kobject *tables_kobj;
251static struct kobject *dynamic_tables_kobj;
252
253struct acpi_table_attr {
254 struct bin_attribute attr;
255 char name[8];
256 int instance;
257 struct list_head node;
258};
259
260static ssize_t acpi_table_show(struct file *filp, struct kobject *kobj,
261 struct bin_attribute *bin_attr, char *buf,
262 loff_t offset, size_t count)
263{
264 struct acpi_table_attr *table_attr =
265 container_of(bin_attr, struct acpi_table_attr, attr);
266 struct acpi_table_header *table_header = NULL;
267 acpi_status status;
268 char name[ACPI_NAME_SIZE];
269
270 if (strncmp(table_attr->name, "NULL", 4))
271 memcpy(name, table_attr->name, ACPI_NAME_SIZE);
272 else
273 memcpy(name, "\0\0\0\0", 4);
274
275 status = acpi_get_table(name, table_attr->instance, &table_header);
276 if (ACPI_FAILURE(status))
277 return -ENODEV;
278
279 return memory_read_from_buffer(buf, count, &offset,
280 table_header, table_header->length);
281}
282
283static void acpi_table_attr_init(struct acpi_table_attr *table_attr,
284 struct acpi_table_header *table_header)
285{
286 struct acpi_table_header *header = NULL;
287 struct acpi_table_attr *attr = NULL;
288
289 sysfs_attr_init(&table_attr->attr.attr);
290 if (table_header->signature[0] != '\0')
291 memcpy(table_attr->name, table_header->signature,
292 ACPI_NAME_SIZE);
293 else
294 memcpy(table_attr->name, "NULL", 4);
295
296 list_for_each_entry(attr, &acpi_table_attr_list, node) {
297 if (!memcmp(table_attr->name, attr->name, ACPI_NAME_SIZE))
298 if (table_attr->instance < attr->instance)
299 table_attr->instance = attr->instance;
300 }
301 table_attr->instance++;
302
303 if (table_attr->instance > 1 || (table_attr->instance == 1 &&
304 !acpi_get_table
305 (table_header->signature, 2, &header)))
306 sprintf(table_attr->name + ACPI_NAME_SIZE, "%d",
307 table_attr->instance);
308
309 table_attr->attr.size = 0;
310 table_attr->attr.read = acpi_table_show;
311 table_attr->attr.attr.name = table_attr->name;
312 table_attr->attr.attr.mode = 0400;
313
314 return;
315}
316
317static acpi_status
318acpi_sysfs_table_handler(u32 event, void *table, void *context)
319{
320 struct acpi_table_attr *table_attr;
321
322 switch (event) {
323 case ACPI_TABLE_EVENT_LOAD:
324 table_attr =
325 kzalloc(sizeof(struct acpi_table_attr), GFP_KERNEL);
326 if (!table_attr)
327 return AE_NO_MEMORY;
328
329 acpi_table_attr_init(table_attr, table);
330 if (sysfs_create_bin_file(dynamic_tables_kobj,
331 &table_attr->attr)) {
332 kfree(table_attr);
333 return AE_ERROR;
334 } else
335 list_add_tail(&table_attr->node, &acpi_table_attr_list);
336 break;
337 case ACPI_TABLE_EVENT_UNLOAD:
338 /*
339 * we do not need to do anything right now
340 * because the table is not deleted from the
341 * global table list when unloading it.
342 */
343 break;
344 default:
345 return AE_BAD_PARAMETER;
346 }
347 return AE_OK;
348}
349
350static int acpi_tables_sysfs_init(void)
351{
352 struct acpi_table_attr *table_attr;
353 struct acpi_table_header *table_header = NULL;
354 int table_index = 0;
355 int result;
356
357 tables_kobj = kobject_create_and_add("tables", acpi_kobj);
358 if (!tables_kobj)
359 goto err;
360
361 dynamic_tables_kobj = kobject_create_and_add("dynamic", tables_kobj);
362 if (!dynamic_tables_kobj)
363 goto err_dynamic_tables;
364
365 do {
366 result = acpi_get_table_by_index(table_index, &table_header);
367 if (!result) {
368 table_index++;
369 table_attr = NULL;
370 table_attr =
371 kzalloc(sizeof(struct acpi_table_attr), GFP_KERNEL);
372 if (!table_attr)
373 return -ENOMEM;
374
375 acpi_table_attr_init(table_attr, table_header);
376 result =
377 sysfs_create_bin_file(tables_kobj,
378 &table_attr->attr);
379 if (result) {
380 kfree(table_attr);
381 return result;
382 } else
383 list_add_tail(&table_attr->node,
384 &acpi_table_attr_list);
385 }
386 } while (!result);
387 kobject_uevent(tables_kobj, KOBJ_ADD);
388 kobject_uevent(dynamic_tables_kobj, KOBJ_ADD);
389 result = acpi_install_table_handler(acpi_sysfs_table_handler, NULL);
390
391 return result == AE_OK ? 0 : -EINVAL;
392err_dynamic_tables:
393 kobject_put(tables_kobj);
394err:
395 return -ENOMEM;
396}
397
398/*
399 * Detailed ACPI IRQ counters:
400 * /sys/firmware/acpi/interrupts/
401 */
402
403u32 acpi_irq_handled;
404u32 acpi_irq_not_handled;
405
406#define COUNT_GPE 0
407#define COUNT_SCI 1 /* acpi_irq_handled */
408#define COUNT_SCI_NOT 2 /* acpi_irq_not_handled */
409#define COUNT_ERROR 3 /* other */
410#define NUM_COUNTERS_EXTRA 4
411
412struct event_counter {
413 u32 count;
414 u32 flags;
415};
416
417static struct event_counter *all_counters;
418static u32 num_gpes;
419static u32 num_counters;
420static struct attribute **all_attrs;
421static u32 acpi_gpe_count;
422
423static struct attribute_group interrupt_stats_attr_group = {
424 .name = "interrupts",
425};
426
427static struct kobj_attribute *counter_attrs;
428
429static void delete_gpe_attr_array(void)
430{
431 struct event_counter *tmp = all_counters;
432
433 all_counters = NULL;
434 kfree(tmp);
435
436 if (counter_attrs) {
437 int i;
438
439 for (i = 0; i < num_gpes; i++)
440 kfree(counter_attrs[i].attr.name);
441
442 kfree(counter_attrs);
443 }
444 kfree(all_attrs);
445
446 return;
447}
448
449static void gpe_count(u32 gpe_number)
450{
451 acpi_gpe_count++;
452
453 if (!all_counters)
454 return;
455
456 if (gpe_number < num_gpes)
457 all_counters[gpe_number].count++;
458 else
459 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS +
460 COUNT_ERROR].count++;
461
462 return;
463}
464
465static void fixed_event_count(u32 event_number)
466{
467 if (!all_counters)
468 return;
469
470 if (event_number < ACPI_NUM_FIXED_EVENTS)
471 all_counters[num_gpes + event_number].count++;
472 else
473 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS +
474 COUNT_ERROR].count++;
475
476 return;
477}
478
479static void acpi_gbl_event_handler(u32 event_type, acpi_handle device,
480 u32 event_number, void *context)
481{
482 if (event_type == ACPI_EVENT_TYPE_GPE)
483 gpe_count(event_number);
484
485 if (event_type == ACPI_EVENT_TYPE_FIXED)
486 fixed_event_count(event_number);
487}
488
489static int get_status(u32 index, acpi_event_status *status,
490 acpi_handle *handle)
491{
492 int result = 0;
493
494 if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
495 goto end;
496
497 if (index < num_gpes) {
498 result = acpi_get_gpe_device(index, handle);
499 if (result) {
500 ACPI_EXCEPTION((AE_INFO, AE_NOT_FOUND,
501 "Invalid GPE 0x%x\n", index));
502 goto end;
503 }
504 result = acpi_get_gpe_status(*handle, index, status);
505 } else if (index < (num_gpes + ACPI_NUM_FIXED_EVENTS))
506 result = acpi_get_event_status(index - num_gpes, status);
507
508end:
509 return result;
510}
511
512static ssize_t counter_show(struct kobject *kobj,
513 struct kobj_attribute *attr, char *buf)
514{
515 int index = attr - counter_attrs;
516 int size;
517 acpi_handle handle;
518 acpi_event_status status;
519 int result = 0;
520
521 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI].count =
522 acpi_irq_handled;
523 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT].count =
524 acpi_irq_not_handled;
525 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE].count =
526 acpi_gpe_count;
527 size = sprintf(buf, "%8d", all_counters[index].count);
528
529 /* "gpe_all" or "sci" */
530 if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
531 goto end;
532
533 result = get_status(index, &status, &handle);
534 if (result)
535 goto end;
536
537 if (!(status & ACPI_EVENT_FLAG_HANDLE))
538 size += sprintf(buf + size, " invalid");
539 else if (status & ACPI_EVENT_FLAG_ENABLED)
540 size += sprintf(buf + size, " enabled");
541 else if (status & ACPI_EVENT_FLAG_WAKE_ENABLED)
542 size += sprintf(buf + size, " wake_enabled");
543 else
544 size += sprintf(buf + size, " disabled");
545
546end:
547 size += sprintf(buf + size, "\n");
548 return result ? result : size;
549}
550
551/*
552 * counter_set() sets the specified counter.
553 * setting the total "sci" file to any value clears all counters.
554 * enable/disable/clear a gpe/fixed event in user space.
555 */
556static ssize_t counter_set(struct kobject *kobj,
557 struct kobj_attribute *attr, const char *buf,
558 size_t size)
559{
560 int index = attr - counter_attrs;
561 acpi_event_status status;
562 acpi_handle handle;
563 int result = 0;
564
565 if (index == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI) {
566 int i;
567 for (i = 0; i < num_counters; ++i)
568 all_counters[i].count = 0;
569 acpi_gpe_count = 0;
570 acpi_irq_handled = 0;
571 acpi_irq_not_handled = 0;
572 goto end;
573 }
574
575 /* show the event status for both GPEs and Fixed Events */
576 result = get_status(index, &status, &handle);
577 if (result)
578 goto end;
579
580 if (!(status & ACPI_EVENT_FLAG_HANDLE)) {
581 printk(KERN_WARNING PREFIX
582 "Can not change Invalid GPE/Fixed Event status\n");
583 return -EINVAL;
584 }
585
586 if (index < num_gpes) {
587 if (!strcmp(buf, "disable\n") &&
588 (status & ACPI_EVENT_FLAG_ENABLED))
589 result = acpi_disable_gpe(handle, index);
590 else if (!strcmp(buf, "enable\n") &&
591 !(status & ACPI_EVENT_FLAG_ENABLED))
592 result = acpi_enable_gpe(handle, index);
593 else if (!strcmp(buf, "clear\n") &&
594 (status & ACPI_EVENT_FLAG_SET))
595 result = acpi_clear_gpe(handle, index);
596 else
597 all_counters[index].count = strtoul(buf, NULL, 0);
598 } else if (index < num_gpes + ACPI_NUM_FIXED_EVENTS) {
599 int event = index - num_gpes;
600 if (!strcmp(buf, "disable\n") &&
601 (status & ACPI_EVENT_FLAG_ENABLED))
602 result = acpi_disable_event(event, ACPI_NOT_ISR);
603 else if (!strcmp(buf, "enable\n") &&
604 !(status & ACPI_EVENT_FLAG_ENABLED))
605 result = acpi_enable_event(event, ACPI_NOT_ISR);
606 else if (!strcmp(buf, "clear\n") &&
607 (status & ACPI_EVENT_FLAG_SET))
608 result = acpi_clear_event(event);
609 else
610 all_counters[index].count = strtoul(buf, NULL, 0);
611 } else
612 all_counters[index].count = strtoul(buf, NULL, 0);
613
614 if (ACPI_FAILURE(result))
615 result = -EINVAL;
616end:
617 return result ? result : size;
618}
619
620void acpi_irq_stats_init(void)
621{
622 acpi_status status;
623 int i;
624
625 if (all_counters)
626 return;
627
628 num_gpes = acpi_current_gpe_count;
629 num_counters = num_gpes + ACPI_NUM_FIXED_EVENTS + NUM_COUNTERS_EXTRA;
630
631 all_attrs = kzalloc(sizeof(struct attribute *) * (num_counters + 1),
632 GFP_KERNEL);
633 if (all_attrs == NULL)
634 return;
635
636 all_counters = kzalloc(sizeof(struct event_counter) * (num_counters),
637 GFP_KERNEL);
638 if (all_counters == NULL)
639 goto fail;
640
641 status = acpi_install_global_event_handler(acpi_gbl_event_handler, NULL);
642 if (ACPI_FAILURE(status))
643 goto fail;
644
645 counter_attrs = kzalloc(sizeof(struct kobj_attribute) * (num_counters),
646 GFP_KERNEL);
647 if (counter_attrs == NULL)
648 goto fail;
649
650 for (i = 0; i < num_counters; ++i) {
651 char buffer[12];
652 char *name;
653
654 if (i < num_gpes)
655 sprintf(buffer, "gpe%02X", i);
656 else if (i == num_gpes + ACPI_EVENT_PMTIMER)
657 sprintf(buffer, "ff_pmtimer");
658 else if (i == num_gpes + ACPI_EVENT_GLOBAL)
659 sprintf(buffer, "ff_gbl_lock");
660 else if (i == num_gpes + ACPI_EVENT_POWER_BUTTON)
661 sprintf(buffer, "ff_pwr_btn");
662 else if (i == num_gpes + ACPI_EVENT_SLEEP_BUTTON)
663 sprintf(buffer, "ff_slp_btn");
664 else if (i == num_gpes + ACPI_EVENT_RTC)
665 sprintf(buffer, "ff_rt_clk");
666 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE)
667 sprintf(buffer, "gpe_all");
668 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI)
669 sprintf(buffer, "sci");
670 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT)
671 sprintf(buffer, "sci_not");
672 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR)
673 sprintf(buffer, "error");
674 else
675 sprintf(buffer, "bug%02X", i);
676
677 name = kzalloc(strlen(buffer) + 1, GFP_KERNEL);
678 if (name == NULL)
679 goto fail;
680 strncpy(name, buffer, strlen(buffer) + 1);
681
682 sysfs_attr_init(&counter_attrs[i].attr);
683 counter_attrs[i].attr.name = name;
684 counter_attrs[i].attr.mode = 0644;
685 counter_attrs[i].show = counter_show;
686 counter_attrs[i].store = counter_set;
687
688 all_attrs[i] = &counter_attrs[i].attr;
689 }
690
691 interrupt_stats_attr_group.attrs = all_attrs;
692 if (!sysfs_create_group(acpi_kobj, &interrupt_stats_attr_group))
693 return;
694
695fail:
696 delete_gpe_attr_array();
697 return;
698}
699
700static void __exit interrupt_stats_exit(void)
701{
702 sysfs_remove_group(acpi_kobj, &interrupt_stats_attr_group);
703
704 delete_gpe_attr_array();
705
706 return;
707}
708
709static ssize_t
710acpi_show_profile(struct device *dev, struct device_attribute *attr,
711 char *buf)
712{
713 return sprintf(buf, "%d\n", acpi_gbl_FADT.preferred_profile);
714}
715
716static const struct device_attribute pm_profile_attr =
717 __ATTR(pm_profile, S_IRUGO, acpi_show_profile, NULL);
718
719int __init acpi_sysfs_init(void)
720{
721 int result;
722
723 result = acpi_tables_sysfs_init();
724 if (result)
725 return result;
726 result = sysfs_create_file(acpi_kobj, &pm_profile_attr.attr);
727 return result;
728}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * sysfs.c - ACPI sysfs interface to userspace.
4 */
5
6#define pr_fmt(fmt) "ACPI: " fmt
7
8#include <linux/init.h>
9#include <linux/kernel.h>
10#include <linux/moduleparam.h>
11#include <linux/acpi.h>
12
13#include "internal.h"
14
15#define _COMPONENT ACPI_SYSTEM_COMPONENT
16ACPI_MODULE_NAME("sysfs");
17
18#ifdef CONFIG_ACPI_DEBUG
19/*
20 * ACPI debug sysfs I/F, including:
21 * /sys/modules/acpi/parameters/debug_layer
22 * /sys/modules/acpi/parameters/debug_level
23 * /sys/modules/acpi/parameters/trace_method_name
24 * /sys/modules/acpi/parameters/trace_state
25 * /sys/modules/acpi/parameters/trace_debug_layer
26 * /sys/modules/acpi/parameters/trace_debug_level
27 */
28
29struct acpi_dlayer {
30 const char *name;
31 unsigned long value;
32};
33struct acpi_dlevel {
34 const char *name;
35 unsigned long value;
36};
37#define ACPI_DEBUG_INIT(v) { .name = #v, .value = v }
38
39static const struct acpi_dlayer acpi_debug_layers[] = {
40 ACPI_DEBUG_INIT(ACPI_UTILITIES),
41 ACPI_DEBUG_INIT(ACPI_HARDWARE),
42 ACPI_DEBUG_INIT(ACPI_EVENTS),
43 ACPI_DEBUG_INIT(ACPI_TABLES),
44 ACPI_DEBUG_INIT(ACPI_NAMESPACE),
45 ACPI_DEBUG_INIT(ACPI_PARSER),
46 ACPI_DEBUG_INIT(ACPI_DISPATCHER),
47 ACPI_DEBUG_INIT(ACPI_EXECUTER),
48 ACPI_DEBUG_INIT(ACPI_RESOURCES),
49 ACPI_DEBUG_INIT(ACPI_CA_DEBUGGER),
50 ACPI_DEBUG_INIT(ACPI_OS_SERVICES),
51 ACPI_DEBUG_INIT(ACPI_CA_DISASSEMBLER),
52 ACPI_DEBUG_INIT(ACPI_COMPILER),
53 ACPI_DEBUG_INIT(ACPI_TOOLS),
54
55 ACPI_DEBUG_INIT(ACPI_BUS_COMPONENT),
56 ACPI_DEBUG_INIT(ACPI_AC_COMPONENT),
57 ACPI_DEBUG_INIT(ACPI_BATTERY_COMPONENT),
58 ACPI_DEBUG_INIT(ACPI_BUTTON_COMPONENT),
59 ACPI_DEBUG_INIT(ACPI_SBS_COMPONENT),
60 ACPI_DEBUG_INIT(ACPI_FAN_COMPONENT),
61 ACPI_DEBUG_INIT(ACPI_PCI_COMPONENT),
62 ACPI_DEBUG_INIT(ACPI_POWER_COMPONENT),
63 ACPI_DEBUG_INIT(ACPI_CONTAINER_COMPONENT),
64 ACPI_DEBUG_INIT(ACPI_SYSTEM_COMPONENT),
65 ACPI_DEBUG_INIT(ACPI_THERMAL_COMPONENT),
66 ACPI_DEBUG_INIT(ACPI_MEMORY_DEVICE_COMPONENT),
67 ACPI_DEBUG_INIT(ACPI_VIDEO_COMPONENT),
68 ACPI_DEBUG_INIT(ACPI_PROCESSOR_COMPONENT),
69};
70
71static const struct acpi_dlevel acpi_debug_levels[] = {
72 ACPI_DEBUG_INIT(ACPI_LV_INIT),
73 ACPI_DEBUG_INIT(ACPI_LV_DEBUG_OBJECT),
74 ACPI_DEBUG_INIT(ACPI_LV_INFO),
75 ACPI_DEBUG_INIT(ACPI_LV_REPAIR),
76 ACPI_DEBUG_INIT(ACPI_LV_TRACE_POINT),
77
78 ACPI_DEBUG_INIT(ACPI_LV_INIT_NAMES),
79 ACPI_DEBUG_INIT(ACPI_LV_PARSE),
80 ACPI_DEBUG_INIT(ACPI_LV_LOAD),
81 ACPI_DEBUG_INIT(ACPI_LV_DISPATCH),
82 ACPI_DEBUG_INIT(ACPI_LV_EXEC),
83 ACPI_DEBUG_INIT(ACPI_LV_NAMES),
84 ACPI_DEBUG_INIT(ACPI_LV_OPREGION),
85 ACPI_DEBUG_INIT(ACPI_LV_BFIELD),
86 ACPI_DEBUG_INIT(ACPI_LV_TABLES),
87 ACPI_DEBUG_INIT(ACPI_LV_VALUES),
88 ACPI_DEBUG_INIT(ACPI_LV_OBJECTS),
89 ACPI_DEBUG_INIT(ACPI_LV_RESOURCES),
90 ACPI_DEBUG_INIT(ACPI_LV_USER_REQUESTS),
91 ACPI_DEBUG_INIT(ACPI_LV_PACKAGE),
92
93 ACPI_DEBUG_INIT(ACPI_LV_ALLOCATIONS),
94 ACPI_DEBUG_INIT(ACPI_LV_FUNCTIONS),
95 ACPI_DEBUG_INIT(ACPI_LV_OPTIMIZATIONS),
96
97 ACPI_DEBUG_INIT(ACPI_LV_MUTEX),
98 ACPI_DEBUG_INIT(ACPI_LV_THREADS),
99 ACPI_DEBUG_INIT(ACPI_LV_IO),
100 ACPI_DEBUG_INIT(ACPI_LV_INTERRUPTS),
101
102 ACPI_DEBUG_INIT(ACPI_LV_AML_DISASSEMBLE),
103 ACPI_DEBUG_INIT(ACPI_LV_VERBOSE_INFO),
104 ACPI_DEBUG_INIT(ACPI_LV_FULL_TABLES),
105 ACPI_DEBUG_INIT(ACPI_LV_EVENTS),
106};
107
108static int param_get_debug_layer(char *buffer, const struct kernel_param *kp)
109{
110 int result = 0;
111 int i;
112
113 result = sprintf(buffer, "%-25s\tHex SET\n", "Description");
114
115 for (i = 0; i < ARRAY_SIZE(acpi_debug_layers); i++) {
116 result += sprintf(buffer + result, "%-25s\t0x%08lX [%c]\n",
117 acpi_debug_layers[i].name,
118 acpi_debug_layers[i].value,
119 (acpi_dbg_layer & acpi_debug_layers[i].value)
120 ? '*' : ' ');
121 }
122 result +=
123 sprintf(buffer + result, "%-25s\t0x%08X [%c]\n", "ACPI_ALL_DRIVERS",
124 ACPI_ALL_DRIVERS,
125 (acpi_dbg_layer & ACPI_ALL_DRIVERS) ==
126 ACPI_ALL_DRIVERS ? '*' : (acpi_dbg_layer & ACPI_ALL_DRIVERS)
127 == 0 ? ' ' : '-');
128 result +=
129 sprintf(buffer + result,
130 "--\ndebug_layer = 0x%08X ( * = enabled)\n",
131 acpi_dbg_layer);
132
133 return result;
134}
135
136static int param_get_debug_level(char *buffer, const struct kernel_param *kp)
137{
138 int result = 0;
139 int i;
140
141 result = sprintf(buffer, "%-25s\tHex SET\n", "Description");
142
143 for (i = 0; i < ARRAY_SIZE(acpi_debug_levels); i++) {
144 result += sprintf(buffer + result, "%-25s\t0x%08lX [%c]\n",
145 acpi_debug_levels[i].name,
146 acpi_debug_levels[i].value,
147 (acpi_dbg_level & acpi_debug_levels[i].value)
148 ? '*' : ' ');
149 }
150 result +=
151 sprintf(buffer + result, "--\ndebug_level = 0x%08X (* = enabled)\n",
152 acpi_dbg_level);
153
154 return result;
155}
156
157static const struct kernel_param_ops param_ops_debug_layer = {
158 .set = param_set_uint,
159 .get = param_get_debug_layer,
160};
161
162static const struct kernel_param_ops param_ops_debug_level = {
163 .set = param_set_uint,
164 .get = param_get_debug_level,
165};
166
167module_param_cb(debug_layer, ¶m_ops_debug_layer, &acpi_dbg_layer, 0644);
168module_param_cb(debug_level, ¶m_ops_debug_level, &acpi_dbg_level, 0644);
169
170static char trace_method_name[1024];
171
172static int param_set_trace_method_name(const char *val,
173 const struct kernel_param *kp)
174{
175 u32 saved_flags = 0;
176 bool is_abs_path = true;
177
178 if (*val != '\\')
179 is_abs_path = false;
180
181 if ((is_abs_path && strlen(val) > 1023) ||
182 (!is_abs_path && strlen(val) > 1022)) {
183 pr_err("%s: string parameter too long\n", kp->name);
184 return -ENOSPC;
185 }
186
187 /*
188 * It's not safe to update acpi_gbl_trace_method_name without
189 * having the tracer stopped, so we save the original tracer
190 * state and disable it.
191 */
192 saved_flags = acpi_gbl_trace_flags;
193 (void)acpi_debug_trace(NULL,
194 acpi_gbl_trace_dbg_level,
195 acpi_gbl_trace_dbg_layer,
196 0);
197
198 /* This is a hack. We can't kmalloc in early boot. */
199 if (is_abs_path)
200 strcpy(trace_method_name, val);
201 else {
202 trace_method_name[0] = '\\';
203 strcpy(trace_method_name+1, val);
204 }
205
206 /* Restore the original tracer state */
207 (void)acpi_debug_trace(trace_method_name,
208 acpi_gbl_trace_dbg_level,
209 acpi_gbl_trace_dbg_layer,
210 saved_flags);
211
212 return 0;
213}
214
215static int param_get_trace_method_name(char *buffer, const struct kernel_param *kp)
216{
217 return scnprintf(buffer, PAGE_SIZE, "%s", acpi_gbl_trace_method_name);
218}
219
220static const struct kernel_param_ops param_ops_trace_method = {
221 .set = param_set_trace_method_name,
222 .get = param_get_trace_method_name,
223};
224
225static const struct kernel_param_ops param_ops_trace_attrib = {
226 .set = param_set_uint,
227 .get = param_get_uint,
228};
229
230module_param_cb(trace_method_name, ¶m_ops_trace_method, &trace_method_name, 0644);
231module_param_cb(trace_debug_layer, ¶m_ops_trace_attrib, &acpi_gbl_trace_dbg_layer, 0644);
232module_param_cb(trace_debug_level, ¶m_ops_trace_attrib, &acpi_gbl_trace_dbg_level, 0644);
233
234static int param_set_trace_state(const char *val,
235 const struct kernel_param *kp)
236{
237 acpi_status status;
238 const char *method = trace_method_name;
239 u32 flags = 0;
240
241/* So "xxx-once" comparison should go prior than "xxx" comparison */
242#define acpi_compare_param(val, key) \
243 strncmp((val), (key), sizeof(key) - 1)
244
245 if (!acpi_compare_param(val, "enable")) {
246 method = NULL;
247 flags = ACPI_TRACE_ENABLED;
248 } else if (!acpi_compare_param(val, "disable"))
249 method = NULL;
250 else if (!acpi_compare_param(val, "method-once"))
251 flags = ACPI_TRACE_ENABLED | ACPI_TRACE_ONESHOT;
252 else if (!acpi_compare_param(val, "method"))
253 flags = ACPI_TRACE_ENABLED;
254 else if (!acpi_compare_param(val, "opcode-once"))
255 flags = ACPI_TRACE_ENABLED | ACPI_TRACE_ONESHOT | ACPI_TRACE_OPCODE;
256 else if (!acpi_compare_param(val, "opcode"))
257 flags = ACPI_TRACE_ENABLED | ACPI_TRACE_OPCODE;
258 else
259 return -EINVAL;
260
261 status = acpi_debug_trace(method,
262 acpi_gbl_trace_dbg_level,
263 acpi_gbl_trace_dbg_layer,
264 flags);
265 if (ACPI_FAILURE(status))
266 return -EBUSY;
267
268 return 0;
269}
270
271static int param_get_trace_state(char *buffer, const struct kernel_param *kp)
272{
273 if (!(acpi_gbl_trace_flags & ACPI_TRACE_ENABLED))
274 return sprintf(buffer, "disable");
275 else {
276 if (acpi_gbl_trace_method_name) {
277 if (acpi_gbl_trace_flags & ACPI_TRACE_ONESHOT)
278 return sprintf(buffer, "method-once");
279 else
280 return sprintf(buffer, "method");
281 } else
282 return sprintf(buffer, "enable");
283 }
284 return 0;
285}
286
287module_param_call(trace_state, param_set_trace_state, param_get_trace_state,
288 NULL, 0644);
289#endif /* CONFIG_ACPI_DEBUG */
290
291
292/* /sys/modules/acpi/parameters/aml_debug_output */
293
294module_param_named(aml_debug_output, acpi_gbl_enable_aml_debug_object,
295 byte, 0644);
296MODULE_PARM_DESC(aml_debug_output,
297 "To enable/disable the ACPI Debug Object output.");
298
299/* /sys/module/acpi/parameters/acpica_version */
300static int param_get_acpica_version(char *buffer,
301 const struct kernel_param *kp)
302{
303 int result;
304
305 result = sprintf(buffer, "%x", ACPI_CA_VERSION);
306
307 return result;
308}
309
310module_param_call(acpica_version, NULL, param_get_acpica_version, NULL, 0444);
311
312/*
313 * ACPI table sysfs I/F:
314 * /sys/firmware/acpi/tables/
315 * /sys/firmware/acpi/tables/data/
316 * /sys/firmware/acpi/tables/dynamic/
317 */
318
319static LIST_HEAD(acpi_table_attr_list);
320static struct kobject *tables_kobj;
321static struct kobject *tables_data_kobj;
322static struct kobject *dynamic_tables_kobj;
323static struct kobject *hotplug_kobj;
324
325#define ACPI_MAX_TABLE_INSTANCES 999
326#define ACPI_INST_SIZE 4 /* including trailing 0 */
327
328struct acpi_table_attr {
329 struct bin_attribute attr;
330 char name[ACPI_NAME_SIZE];
331 int instance;
332 char filename[ACPI_NAME_SIZE+ACPI_INST_SIZE];
333 struct list_head node;
334};
335
336struct acpi_data_attr {
337 struct bin_attribute attr;
338 u64 addr;
339};
340
341static ssize_t acpi_table_show(struct file *filp, struct kobject *kobj,
342 struct bin_attribute *bin_attr, char *buf,
343 loff_t offset, size_t count)
344{
345 struct acpi_table_attr *table_attr =
346 container_of(bin_attr, struct acpi_table_attr, attr);
347 struct acpi_table_header *table_header = NULL;
348 acpi_status status;
349 ssize_t rc;
350
351 status = acpi_get_table(table_attr->name, table_attr->instance,
352 &table_header);
353 if (ACPI_FAILURE(status))
354 return -ENODEV;
355
356 rc = memory_read_from_buffer(buf, count, &offset, table_header,
357 table_header->length);
358 acpi_put_table(table_header);
359 return rc;
360}
361
362static int acpi_table_attr_init(struct kobject *tables_obj,
363 struct acpi_table_attr *table_attr,
364 struct acpi_table_header *table_header)
365{
366 struct acpi_table_header *header = NULL;
367 struct acpi_table_attr *attr = NULL;
368 char instance_str[ACPI_INST_SIZE];
369
370 sysfs_attr_init(&table_attr->attr.attr);
371 ACPI_MOVE_NAME(table_attr->name, table_header->signature);
372
373 list_for_each_entry(attr, &acpi_table_attr_list, node) {
374 if (ACPI_COMPARE_NAME(table_attr->name, attr->name))
375 if (table_attr->instance < attr->instance)
376 table_attr->instance = attr->instance;
377 }
378 table_attr->instance++;
379 if (table_attr->instance > ACPI_MAX_TABLE_INSTANCES) {
380 pr_warn("%4.4s: too many table instances\n",
381 table_attr->name);
382 return -ERANGE;
383 }
384
385 ACPI_MOVE_NAME(table_attr->filename, table_header->signature);
386 table_attr->filename[ACPI_NAME_SIZE] = '\0';
387 if (table_attr->instance > 1 || (table_attr->instance == 1 &&
388 !acpi_get_table
389 (table_header->signature, 2, &header))) {
390 snprintf(instance_str, sizeof(instance_str), "%u",
391 table_attr->instance);
392 strcat(table_attr->filename, instance_str);
393 }
394
395 table_attr->attr.size = table_header->length;
396 table_attr->attr.read = acpi_table_show;
397 table_attr->attr.attr.name = table_attr->filename;
398 table_attr->attr.attr.mode = 0400;
399
400 return sysfs_create_bin_file(tables_obj, &table_attr->attr);
401}
402
403acpi_status acpi_sysfs_table_handler(u32 event, void *table, void *context)
404{
405 struct acpi_table_attr *table_attr;
406
407 switch (event) {
408 case ACPI_TABLE_EVENT_INSTALL:
409 table_attr =
410 kzalloc(sizeof(struct acpi_table_attr), GFP_KERNEL);
411 if (!table_attr)
412 return AE_NO_MEMORY;
413
414 if (acpi_table_attr_init(dynamic_tables_kobj,
415 table_attr, table)) {
416 kfree(table_attr);
417 return AE_ERROR;
418 }
419 list_add_tail(&table_attr->node, &acpi_table_attr_list);
420 break;
421 case ACPI_TABLE_EVENT_LOAD:
422 case ACPI_TABLE_EVENT_UNLOAD:
423 case ACPI_TABLE_EVENT_UNINSTALL:
424 /*
425 * we do not need to do anything right now
426 * because the table is not deleted from the
427 * global table list when unloading it.
428 */
429 break;
430 default:
431 return AE_BAD_PARAMETER;
432 }
433 return AE_OK;
434}
435
436static ssize_t acpi_data_show(struct file *filp, struct kobject *kobj,
437 struct bin_attribute *bin_attr, char *buf,
438 loff_t offset, size_t count)
439{
440 struct acpi_data_attr *data_attr;
441 void __iomem *base;
442 ssize_t rc;
443
444 data_attr = container_of(bin_attr, struct acpi_data_attr, attr);
445
446 base = acpi_os_map_memory(data_attr->addr, data_attr->attr.size);
447 if (!base)
448 return -ENOMEM;
449 rc = memory_read_from_buffer(buf, count, &offset, base,
450 data_attr->attr.size);
451 acpi_os_unmap_memory(base, data_attr->attr.size);
452
453 return rc;
454}
455
456static int acpi_bert_data_init(void *th, struct acpi_data_attr *data_attr)
457{
458 struct acpi_table_bert *bert = th;
459
460 if (bert->header.length < sizeof(struct acpi_table_bert) ||
461 bert->region_length < sizeof(struct acpi_hest_generic_status)) {
462 kfree(data_attr);
463 return -EINVAL;
464 }
465 data_attr->addr = bert->address;
466 data_attr->attr.size = bert->region_length;
467 data_attr->attr.attr.name = "BERT";
468
469 return sysfs_create_bin_file(tables_data_kobj, &data_attr->attr);
470}
471
472static struct acpi_data_obj {
473 char *name;
474 int (*fn)(void *, struct acpi_data_attr *);
475} acpi_data_objs[] = {
476 { ACPI_SIG_BERT, acpi_bert_data_init },
477};
478
479#define NUM_ACPI_DATA_OBJS ARRAY_SIZE(acpi_data_objs)
480
481static int acpi_table_data_init(struct acpi_table_header *th)
482{
483 struct acpi_data_attr *data_attr;
484 int i;
485
486 for (i = 0; i < NUM_ACPI_DATA_OBJS; i++) {
487 if (ACPI_COMPARE_NAME(th->signature, acpi_data_objs[i].name)) {
488 data_attr = kzalloc(sizeof(*data_attr), GFP_KERNEL);
489 if (!data_attr)
490 return -ENOMEM;
491 sysfs_attr_init(&data_attr->attr.attr);
492 data_attr->attr.read = acpi_data_show;
493 data_attr->attr.attr.mode = 0400;
494 return acpi_data_objs[i].fn(th, data_attr);
495 }
496 }
497 return 0;
498}
499
500static int acpi_tables_sysfs_init(void)
501{
502 struct acpi_table_attr *table_attr;
503 struct acpi_table_header *table_header = NULL;
504 int table_index;
505 acpi_status status;
506 int ret;
507
508 tables_kobj = kobject_create_and_add("tables", acpi_kobj);
509 if (!tables_kobj)
510 goto err;
511
512 tables_data_kobj = kobject_create_and_add("data", tables_kobj);
513 if (!tables_data_kobj)
514 goto err_tables_data;
515
516 dynamic_tables_kobj = kobject_create_and_add("dynamic", tables_kobj);
517 if (!dynamic_tables_kobj)
518 goto err_dynamic_tables;
519
520 for (table_index = 0;; table_index++) {
521 status = acpi_get_table_by_index(table_index, &table_header);
522
523 if (status == AE_BAD_PARAMETER)
524 break;
525
526 if (ACPI_FAILURE(status))
527 continue;
528
529 table_attr = kzalloc(sizeof(*table_attr), GFP_KERNEL);
530 if (!table_attr)
531 return -ENOMEM;
532
533 ret = acpi_table_attr_init(tables_kobj,
534 table_attr, table_header);
535 if (ret) {
536 kfree(table_attr);
537 return ret;
538 }
539 list_add_tail(&table_attr->node, &acpi_table_attr_list);
540 acpi_table_data_init(table_header);
541 }
542
543 kobject_uevent(tables_kobj, KOBJ_ADD);
544 kobject_uevent(tables_data_kobj, KOBJ_ADD);
545 kobject_uevent(dynamic_tables_kobj, KOBJ_ADD);
546
547 return 0;
548err_dynamic_tables:
549 kobject_put(tables_data_kobj);
550err_tables_data:
551 kobject_put(tables_kobj);
552err:
553 return -ENOMEM;
554}
555
556/*
557 * Detailed ACPI IRQ counters:
558 * /sys/firmware/acpi/interrupts/
559 */
560
561u32 acpi_irq_handled;
562u32 acpi_irq_not_handled;
563
564#define COUNT_GPE 0
565#define COUNT_SCI 1 /* acpi_irq_handled */
566#define COUNT_SCI_NOT 2 /* acpi_irq_not_handled */
567#define COUNT_ERROR 3 /* other */
568#define NUM_COUNTERS_EXTRA 4
569
570struct event_counter {
571 u32 count;
572 u32 flags;
573};
574
575static struct event_counter *all_counters;
576static u32 num_gpes;
577static u32 num_counters;
578static struct attribute **all_attrs;
579static u32 acpi_gpe_count;
580
581static struct attribute_group interrupt_stats_attr_group = {
582 .name = "interrupts",
583};
584
585static struct kobj_attribute *counter_attrs;
586
587static void delete_gpe_attr_array(void)
588{
589 struct event_counter *tmp = all_counters;
590
591 all_counters = NULL;
592 kfree(tmp);
593
594 if (counter_attrs) {
595 int i;
596
597 for (i = 0; i < num_gpes; i++)
598 kfree(counter_attrs[i].attr.name);
599
600 kfree(counter_attrs);
601 }
602 kfree(all_attrs);
603
604 return;
605}
606
607static void gpe_count(u32 gpe_number)
608{
609 acpi_gpe_count++;
610
611 if (!all_counters)
612 return;
613
614 if (gpe_number < num_gpes)
615 all_counters[gpe_number].count++;
616 else
617 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS +
618 COUNT_ERROR].count++;
619
620 return;
621}
622
623static void fixed_event_count(u32 event_number)
624{
625 if (!all_counters)
626 return;
627
628 if (event_number < ACPI_NUM_FIXED_EVENTS)
629 all_counters[num_gpes + event_number].count++;
630 else
631 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS +
632 COUNT_ERROR].count++;
633
634 return;
635}
636
637static void acpi_global_event_handler(u32 event_type, acpi_handle device,
638 u32 event_number, void *context)
639{
640 if (event_type == ACPI_EVENT_TYPE_GPE) {
641 gpe_count(event_number);
642 pr_debug("GPE event 0x%02x\n", event_number);
643 } else if (event_type == ACPI_EVENT_TYPE_FIXED) {
644 fixed_event_count(event_number);
645 pr_debug("Fixed event 0x%02x\n", event_number);
646 } else {
647 pr_debug("Other event 0x%02x\n", event_number);
648 }
649}
650
651static int get_status(u32 index, acpi_event_status *status,
652 acpi_handle *handle)
653{
654 int result;
655
656 if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
657 return -EINVAL;
658
659 if (index < num_gpes) {
660 result = acpi_get_gpe_device(index, handle);
661 if (result) {
662 ACPI_EXCEPTION((AE_INFO, AE_NOT_FOUND,
663 "Invalid GPE 0x%x", index));
664 return result;
665 }
666 result = acpi_get_gpe_status(*handle, index, status);
667 } else if (index < (num_gpes + ACPI_NUM_FIXED_EVENTS))
668 result = acpi_get_event_status(index - num_gpes, status);
669
670 return result;
671}
672
673static ssize_t counter_show(struct kobject *kobj,
674 struct kobj_attribute *attr, char *buf)
675{
676 int index = attr - counter_attrs;
677 int size;
678 acpi_handle handle;
679 acpi_event_status status;
680 int result = 0;
681
682 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI].count =
683 acpi_irq_handled;
684 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT].count =
685 acpi_irq_not_handled;
686 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE].count =
687 acpi_gpe_count;
688 size = sprintf(buf, "%8u", all_counters[index].count);
689
690 /* "gpe_all" or "sci" */
691 if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
692 goto end;
693
694 result = get_status(index, &status, &handle);
695 if (result)
696 goto end;
697
698 if (status & ACPI_EVENT_FLAG_ENABLE_SET)
699 size += sprintf(buf + size, " EN");
700 else
701 size += sprintf(buf + size, " ");
702 if (status & ACPI_EVENT_FLAG_STATUS_SET)
703 size += sprintf(buf + size, " STS");
704 else
705 size += sprintf(buf + size, " ");
706
707 if (!(status & ACPI_EVENT_FLAG_HAS_HANDLER))
708 size += sprintf(buf + size, " invalid ");
709 else if (status & ACPI_EVENT_FLAG_ENABLED)
710 size += sprintf(buf + size, " enabled ");
711 else if (status & ACPI_EVENT_FLAG_WAKE_ENABLED)
712 size += sprintf(buf + size, " wake_enabled");
713 else
714 size += sprintf(buf + size, " disabled ");
715 if (status & ACPI_EVENT_FLAG_MASKED)
716 size += sprintf(buf + size, " masked ");
717 else
718 size += sprintf(buf + size, " unmasked");
719
720end:
721 size += sprintf(buf + size, "\n");
722 return result ? result : size;
723}
724
725/*
726 * counter_set() sets the specified counter.
727 * setting the total "sci" file to any value clears all counters.
728 * enable/disable/clear a gpe/fixed event in user space.
729 */
730static ssize_t counter_set(struct kobject *kobj,
731 struct kobj_attribute *attr, const char *buf,
732 size_t size)
733{
734 int index = attr - counter_attrs;
735 acpi_event_status status;
736 acpi_handle handle;
737 int result = 0;
738 unsigned long tmp;
739
740 if (index == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI) {
741 int i;
742 for (i = 0; i < num_counters; ++i)
743 all_counters[i].count = 0;
744 acpi_gpe_count = 0;
745 acpi_irq_handled = 0;
746 acpi_irq_not_handled = 0;
747 goto end;
748 }
749
750 /* show the event status for both GPEs and Fixed Events */
751 result = get_status(index, &status, &handle);
752 if (result)
753 goto end;
754
755 if (!(status & ACPI_EVENT_FLAG_HAS_HANDLER)) {
756 printk(KERN_WARNING PREFIX
757 "Can not change Invalid GPE/Fixed Event status\n");
758 return -EINVAL;
759 }
760
761 if (index < num_gpes) {
762 if (!strcmp(buf, "disable\n") &&
763 (status & ACPI_EVENT_FLAG_ENABLED))
764 result = acpi_disable_gpe(handle, index);
765 else if (!strcmp(buf, "enable\n") &&
766 !(status & ACPI_EVENT_FLAG_ENABLED))
767 result = acpi_enable_gpe(handle, index);
768 else if (!strcmp(buf, "clear\n") &&
769 (status & ACPI_EVENT_FLAG_STATUS_SET))
770 result = acpi_clear_gpe(handle, index);
771 else if (!strcmp(buf, "mask\n"))
772 result = acpi_mask_gpe(handle, index, TRUE);
773 else if (!strcmp(buf, "unmask\n"))
774 result = acpi_mask_gpe(handle, index, FALSE);
775 else if (!kstrtoul(buf, 0, &tmp))
776 all_counters[index].count = tmp;
777 else
778 result = -EINVAL;
779 } else if (index < num_gpes + ACPI_NUM_FIXED_EVENTS) {
780 int event = index - num_gpes;
781 if (!strcmp(buf, "disable\n") &&
782 (status & ACPI_EVENT_FLAG_ENABLE_SET))
783 result = acpi_disable_event(event, ACPI_NOT_ISR);
784 else if (!strcmp(buf, "enable\n") &&
785 !(status & ACPI_EVENT_FLAG_ENABLE_SET))
786 result = acpi_enable_event(event, ACPI_NOT_ISR);
787 else if (!strcmp(buf, "clear\n") &&
788 (status & ACPI_EVENT_FLAG_STATUS_SET))
789 result = acpi_clear_event(event);
790 else if (!kstrtoul(buf, 0, &tmp))
791 all_counters[index].count = tmp;
792 else
793 result = -EINVAL;
794 } else
795 all_counters[index].count = strtoul(buf, NULL, 0);
796
797 if (ACPI_FAILURE(result))
798 result = -EINVAL;
799end:
800 return result ? result : size;
801}
802
803/*
804 * A Quirk Mechanism for GPE Flooding Prevention:
805 *
806 * Quirks may be needed to prevent GPE flooding on a specific GPE. The
807 * flooding typically cannot be detected and automatically prevented by
808 * ACPI_GPE_DISPATCH_NONE check because there is a _Lxx/_Exx prepared in
809 * the AML tables. This normally indicates a feature gap in Linux, thus
810 * instead of providing endless quirk tables, we provide a boot parameter
811 * for those who want this quirk. For example, if the users want to prevent
812 * the GPE flooding for GPE 00, they need to specify the following boot
813 * parameter:
814 * acpi_mask_gpe=0x00
815 * The masking status can be modified by the following runtime controlling
816 * interface:
817 * echo unmask > /sys/firmware/acpi/interrupts/gpe00
818 */
819#define ACPI_MASKABLE_GPE_MAX 0xFF
820static DECLARE_BITMAP(acpi_masked_gpes_map, ACPI_MASKABLE_GPE_MAX) __initdata;
821
822static int __init acpi_gpe_set_masked_gpes(char *val)
823{
824 u8 gpe;
825
826 if (kstrtou8(val, 0, &gpe) || gpe > ACPI_MASKABLE_GPE_MAX)
827 return -EINVAL;
828 set_bit(gpe, acpi_masked_gpes_map);
829
830 return 1;
831}
832__setup("acpi_mask_gpe=", acpi_gpe_set_masked_gpes);
833
834void __init acpi_gpe_apply_masked_gpes(void)
835{
836 acpi_handle handle;
837 acpi_status status;
838 u8 gpe;
839
840 for_each_set_bit(gpe, acpi_masked_gpes_map, ACPI_MASKABLE_GPE_MAX) {
841 status = acpi_get_gpe_device(gpe, &handle);
842 if (ACPI_SUCCESS(status)) {
843 pr_info("Masking GPE 0x%x.\n", gpe);
844 (void)acpi_mask_gpe(handle, gpe, TRUE);
845 }
846 }
847}
848
849void acpi_irq_stats_init(void)
850{
851 acpi_status status;
852 int i;
853
854 if (all_counters)
855 return;
856
857 num_gpes = acpi_current_gpe_count;
858 num_counters = num_gpes + ACPI_NUM_FIXED_EVENTS + NUM_COUNTERS_EXTRA;
859
860 all_attrs = kzalloc(sizeof(struct attribute *) * (num_counters + 1),
861 GFP_KERNEL);
862 if (all_attrs == NULL)
863 return;
864
865 all_counters = kzalloc(sizeof(struct event_counter) * (num_counters),
866 GFP_KERNEL);
867 if (all_counters == NULL)
868 goto fail;
869
870 status = acpi_install_global_event_handler(acpi_global_event_handler, NULL);
871 if (ACPI_FAILURE(status))
872 goto fail;
873
874 counter_attrs = kzalloc(sizeof(struct kobj_attribute) * (num_counters),
875 GFP_KERNEL);
876 if (counter_attrs == NULL)
877 goto fail;
878
879 for (i = 0; i < num_counters; ++i) {
880 char buffer[12];
881 char *name;
882
883 if (i < num_gpes)
884 sprintf(buffer, "gpe%02X", i);
885 else if (i == num_gpes + ACPI_EVENT_PMTIMER)
886 sprintf(buffer, "ff_pmtimer");
887 else if (i == num_gpes + ACPI_EVENT_GLOBAL)
888 sprintf(buffer, "ff_gbl_lock");
889 else if (i == num_gpes + ACPI_EVENT_POWER_BUTTON)
890 sprintf(buffer, "ff_pwr_btn");
891 else if (i == num_gpes + ACPI_EVENT_SLEEP_BUTTON)
892 sprintf(buffer, "ff_slp_btn");
893 else if (i == num_gpes + ACPI_EVENT_RTC)
894 sprintf(buffer, "ff_rt_clk");
895 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE)
896 sprintf(buffer, "gpe_all");
897 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI)
898 sprintf(buffer, "sci");
899 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT)
900 sprintf(buffer, "sci_not");
901 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR)
902 sprintf(buffer, "error");
903 else
904 sprintf(buffer, "bug%02X", i);
905
906 name = kstrdup(buffer, GFP_KERNEL);
907 if (name == NULL)
908 goto fail;
909
910 sysfs_attr_init(&counter_attrs[i].attr);
911 counter_attrs[i].attr.name = name;
912 counter_attrs[i].attr.mode = 0644;
913 counter_attrs[i].show = counter_show;
914 counter_attrs[i].store = counter_set;
915
916 all_attrs[i] = &counter_attrs[i].attr;
917 }
918
919 interrupt_stats_attr_group.attrs = all_attrs;
920 if (!sysfs_create_group(acpi_kobj, &interrupt_stats_attr_group))
921 return;
922
923fail:
924 delete_gpe_attr_array();
925 return;
926}
927
928static void __exit interrupt_stats_exit(void)
929{
930 sysfs_remove_group(acpi_kobj, &interrupt_stats_attr_group);
931
932 delete_gpe_attr_array();
933
934 return;
935}
936
937static ssize_t
938acpi_show_profile(struct device *dev, struct device_attribute *attr,
939 char *buf)
940{
941 return sprintf(buf, "%d\n", acpi_gbl_FADT.preferred_profile);
942}
943
944static const struct device_attribute pm_profile_attr =
945 __ATTR(pm_profile, S_IRUGO, acpi_show_profile, NULL);
946
947static ssize_t hotplug_enabled_show(struct kobject *kobj,
948 struct kobj_attribute *attr, char *buf)
949{
950 struct acpi_hotplug_profile *hotplug = to_acpi_hotplug_profile(kobj);
951
952 return sprintf(buf, "%d\n", hotplug->enabled);
953}
954
955static ssize_t hotplug_enabled_store(struct kobject *kobj,
956 struct kobj_attribute *attr,
957 const char *buf, size_t size)
958{
959 struct acpi_hotplug_profile *hotplug = to_acpi_hotplug_profile(kobj);
960 unsigned int val;
961
962 if (kstrtouint(buf, 10, &val) || val > 1)
963 return -EINVAL;
964
965 acpi_scan_hotplug_enabled(hotplug, val);
966 return size;
967}
968
969static struct kobj_attribute hotplug_enabled_attr =
970 __ATTR(enabled, S_IRUGO | S_IWUSR, hotplug_enabled_show,
971 hotplug_enabled_store);
972
973static struct attribute *hotplug_profile_attrs[] = {
974 &hotplug_enabled_attr.attr,
975 NULL
976};
977
978static struct kobj_type acpi_hotplug_profile_ktype = {
979 .sysfs_ops = &kobj_sysfs_ops,
980 .default_attrs = hotplug_profile_attrs,
981};
982
983void acpi_sysfs_add_hotplug_profile(struct acpi_hotplug_profile *hotplug,
984 const char *name)
985{
986 int error;
987
988 if (!hotplug_kobj)
989 goto err_out;
990
991 error = kobject_init_and_add(&hotplug->kobj,
992 &acpi_hotplug_profile_ktype, hotplug_kobj, "%s", name);
993 if (error)
994 goto err_out;
995
996 kobject_uevent(&hotplug->kobj, KOBJ_ADD);
997 return;
998
999 err_out:
1000 pr_err(PREFIX "Unable to add hotplug profile '%s'\n", name);
1001}
1002
1003static ssize_t force_remove_show(struct kobject *kobj,
1004 struct kobj_attribute *attr, char *buf)
1005{
1006 return sprintf(buf, "%d\n", 0);
1007}
1008
1009static ssize_t force_remove_store(struct kobject *kobj,
1010 struct kobj_attribute *attr,
1011 const char *buf, size_t size)
1012{
1013 bool val;
1014 int ret;
1015
1016 ret = strtobool(buf, &val);
1017 if (ret < 0)
1018 return ret;
1019
1020 if (val) {
1021 pr_err("Enabling force_remove is not supported anymore. Please report to linux-acpi@vger.kernel.org if you depend on this functionality\n");
1022 return -EINVAL;
1023 }
1024 return size;
1025}
1026
1027static const struct kobj_attribute force_remove_attr =
1028 __ATTR(force_remove, S_IRUGO | S_IWUSR, force_remove_show,
1029 force_remove_store);
1030
1031int __init acpi_sysfs_init(void)
1032{
1033 int result;
1034
1035 result = acpi_tables_sysfs_init();
1036 if (result)
1037 return result;
1038
1039 hotplug_kobj = kobject_create_and_add("hotplug", acpi_kobj);
1040 if (!hotplug_kobj)
1041 return -ENOMEM;
1042
1043 result = sysfs_create_file(hotplug_kobj, &force_remove_attr.attr);
1044 if (result)
1045 return result;
1046
1047 result = sysfs_create_file(acpi_kobj, &pm_profile_attr.attr);
1048 return result;
1049}