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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/acpi.h>
9#include <linux/bitmap.h>
10#include <linux/init.h>
11#include <linux/kernel.h>
12#include <linux/kstrtox.h>
13#include <linux/moduleparam.h>
14
15#include "internal.h"
16
17#ifdef CONFIG_ACPI_DEBUG
18/*
19 * ACPI debug sysfs I/F, including:
20 * /sys/modules/acpi/parameters/debug_layer
21 * /sys/modules/acpi/parameters/debug_level
22 * /sys/modules/acpi/parameters/trace_method_name
23 * /sys/modules/acpi/parameters/trace_state
24 * /sys/modules/acpi/parameters/trace_debug_layer
25 * /sys/modules/acpi/parameters/trace_debug_level
26 */
27
28struct acpi_dlayer {
29 const char *name;
30 unsigned long value;
31};
32struct acpi_dlevel {
33 const char *name;
34 unsigned long value;
35};
36#define ACPI_DEBUG_INIT(v) { .name = #v, .value = v }
37
38static const struct acpi_dlayer acpi_debug_layers[] = {
39 ACPI_DEBUG_INIT(ACPI_UTILITIES),
40 ACPI_DEBUG_INIT(ACPI_HARDWARE),
41 ACPI_DEBUG_INIT(ACPI_EVENTS),
42 ACPI_DEBUG_INIT(ACPI_TABLES),
43 ACPI_DEBUG_INIT(ACPI_NAMESPACE),
44 ACPI_DEBUG_INIT(ACPI_PARSER),
45 ACPI_DEBUG_INIT(ACPI_DISPATCHER),
46 ACPI_DEBUG_INIT(ACPI_EXECUTER),
47 ACPI_DEBUG_INIT(ACPI_RESOURCES),
48 ACPI_DEBUG_INIT(ACPI_CA_DEBUGGER),
49 ACPI_DEBUG_INIT(ACPI_OS_SERVICES),
50 ACPI_DEBUG_INIT(ACPI_CA_DISASSEMBLER),
51 ACPI_DEBUG_INIT(ACPI_COMPILER),
52 ACPI_DEBUG_INIT(ACPI_TOOLS),
53};
54
55static const struct acpi_dlevel acpi_debug_levels[] = {
56 ACPI_DEBUG_INIT(ACPI_LV_INIT),
57 ACPI_DEBUG_INIT(ACPI_LV_DEBUG_OBJECT),
58 ACPI_DEBUG_INIT(ACPI_LV_INFO),
59 ACPI_DEBUG_INIT(ACPI_LV_REPAIR),
60 ACPI_DEBUG_INIT(ACPI_LV_TRACE_POINT),
61
62 ACPI_DEBUG_INIT(ACPI_LV_INIT_NAMES),
63 ACPI_DEBUG_INIT(ACPI_LV_PARSE),
64 ACPI_DEBUG_INIT(ACPI_LV_LOAD),
65 ACPI_DEBUG_INIT(ACPI_LV_DISPATCH),
66 ACPI_DEBUG_INIT(ACPI_LV_EXEC),
67 ACPI_DEBUG_INIT(ACPI_LV_NAMES),
68 ACPI_DEBUG_INIT(ACPI_LV_OPREGION),
69 ACPI_DEBUG_INIT(ACPI_LV_BFIELD),
70 ACPI_DEBUG_INIT(ACPI_LV_TABLES),
71 ACPI_DEBUG_INIT(ACPI_LV_VALUES),
72 ACPI_DEBUG_INIT(ACPI_LV_OBJECTS),
73 ACPI_DEBUG_INIT(ACPI_LV_RESOURCES),
74 ACPI_DEBUG_INIT(ACPI_LV_USER_REQUESTS),
75 ACPI_DEBUG_INIT(ACPI_LV_PACKAGE),
76
77 ACPI_DEBUG_INIT(ACPI_LV_ALLOCATIONS),
78 ACPI_DEBUG_INIT(ACPI_LV_FUNCTIONS),
79 ACPI_DEBUG_INIT(ACPI_LV_OPTIMIZATIONS),
80
81 ACPI_DEBUG_INIT(ACPI_LV_MUTEX),
82 ACPI_DEBUG_INIT(ACPI_LV_THREADS),
83 ACPI_DEBUG_INIT(ACPI_LV_IO),
84 ACPI_DEBUG_INIT(ACPI_LV_INTERRUPTS),
85
86 ACPI_DEBUG_INIT(ACPI_LV_AML_DISASSEMBLE),
87 ACPI_DEBUG_INIT(ACPI_LV_VERBOSE_INFO),
88 ACPI_DEBUG_INIT(ACPI_LV_FULL_TABLES),
89 ACPI_DEBUG_INIT(ACPI_LV_EVENTS),
90};
91
92static int param_get_debug_layer(char *buffer, const struct kernel_param *kp)
93{
94 int result = 0;
95 int i;
96
97 result = sprintf(buffer, "%-25s\tHex SET\n", "Description");
98
99 for (i = 0; i < ARRAY_SIZE(acpi_debug_layers); i++) {
100 result += sprintf(buffer + result, "%-25s\t0x%08lX [%c]\n",
101 acpi_debug_layers[i].name,
102 acpi_debug_layers[i].value,
103 (acpi_dbg_layer & acpi_debug_layers[i].value)
104 ? '*' : ' ');
105 }
106 result +=
107 sprintf(buffer + result, "%-25s\t0x%08X [%c]\n", "ACPI_ALL_DRIVERS",
108 ACPI_ALL_DRIVERS,
109 (acpi_dbg_layer & ACPI_ALL_DRIVERS) ==
110 ACPI_ALL_DRIVERS ? '*' : (acpi_dbg_layer & ACPI_ALL_DRIVERS)
111 == 0 ? ' ' : '-');
112 result +=
113 sprintf(buffer + result,
114 "--\ndebug_layer = 0x%08X ( * = enabled)\n",
115 acpi_dbg_layer);
116
117 return result;
118}
119
120static int param_get_debug_level(char *buffer, const struct kernel_param *kp)
121{
122 int result = 0;
123 int i;
124
125 result = sprintf(buffer, "%-25s\tHex SET\n", "Description");
126
127 for (i = 0; i < ARRAY_SIZE(acpi_debug_levels); i++) {
128 result += sprintf(buffer + result, "%-25s\t0x%08lX [%c]\n",
129 acpi_debug_levels[i].name,
130 acpi_debug_levels[i].value,
131 (acpi_dbg_level & acpi_debug_levels[i].value)
132 ? '*' : ' ');
133 }
134 result +=
135 sprintf(buffer + result, "--\ndebug_level = 0x%08X (* = enabled)\n",
136 acpi_dbg_level);
137
138 return result;
139}
140
141static const struct kernel_param_ops param_ops_debug_layer = {
142 .set = param_set_uint,
143 .get = param_get_debug_layer,
144};
145
146static const struct kernel_param_ops param_ops_debug_level = {
147 .set = param_set_uint,
148 .get = param_get_debug_level,
149};
150
151module_param_cb(debug_layer, ¶m_ops_debug_layer, &acpi_dbg_layer, 0644);
152module_param_cb(debug_level, ¶m_ops_debug_level, &acpi_dbg_level, 0644);
153
154static char trace_method_name[1024];
155
156static int param_set_trace_method_name(const char *val,
157 const struct kernel_param *kp)
158{
159 u32 saved_flags = 0;
160 bool is_abs_path = true;
161
162 if (*val != '\\')
163 is_abs_path = false;
164
165 if ((is_abs_path && strlen(val) > 1023) ||
166 (!is_abs_path && strlen(val) > 1022)) {
167 pr_err("%s: string parameter too long\n", kp->name);
168 return -ENOSPC;
169 }
170
171 /*
172 * It's not safe to update acpi_gbl_trace_method_name without
173 * having the tracer stopped, so we save the original tracer
174 * state and disable it.
175 */
176 saved_flags = acpi_gbl_trace_flags;
177 (void)acpi_debug_trace(NULL,
178 acpi_gbl_trace_dbg_level,
179 acpi_gbl_trace_dbg_layer,
180 0);
181
182 /* This is a hack. We can't kmalloc in early boot. */
183 if (is_abs_path)
184 strcpy(trace_method_name, val);
185 else {
186 trace_method_name[0] = '\\';
187 strcpy(trace_method_name+1, val);
188 }
189
190 /* Restore the original tracer state */
191 (void)acpi_debug_trace(trace_method_name,
192 acpi_gbl_trace_dbg_level,
193 acpi_gbl_trace_dbg_layer,
194 saved_flags);
195
196 return 0;
197}
198
199static int param_get_trace_method_name(char *buffer, const struct kernel_param *kp)
200{
201 return sysfs_emit(buffer, "%s\n", acpi_gbl_trace_method_name);
202}
203
204static const struct kernel_param_ops param_ops_trace_method = {
205 .set = param_set_trace_method_name,
206 .get = param_get_trace_method_name,
207};
208
209static const struct kernel_param_ops param_ops_trace_attrib = {
210 .set = param_set_uint,
211 .get = param_get_uint,
212};
213
214module_param_cb(trace_method_name, ¶m_ops_trace_method, &trace_method_name, 0644);
215module_param_cb(trace_debug_layer, ¶m_ops_trace_attrib, &acpi_gbl_trace_dbg_layer, 0644);
216module_param_cb(trace_debug_level, ¶m_ops_trace_attrib, &acpi_gbl_trace_dbg_level, 0644);
217
218static int param_set_trace_state(const char *val,
219 const struct kernel_param *kp)
220{
221 acpi_status status;
222 const char *method = trace_method_name;
223 u32 flags = 0;
224
225/* So "xxx-once" comparison should go prior than "xxx" comparison */
226#define acpi_compare_param(val, key) \
227 strncmp((val), (key), sizeof(key) - 1)
228
229 if (!acpi_compare_param(val, "enable")) {
230 method = NULL;
231 flags = ACPI_TRACE_ENABLED;
232 } else if (!acpi_compare_param(val, "disable"))
233 method = NULL;
234 else if (!acpi_compare_param(val, "method-once"))
235 flags = ACPI_TRACE_ENABLED | ACPI_TRACE_ONESHOT;
236 else if (!acpi_compare_param(val, "method"))
237 flags = ACPI_TRACE_ENABLED;
238 else if (!acpi_compare_param(val, "opcode-once"))
239 flags = ACPI_TRACE_ENABLED | ACPI_TRACE_ONESHOT | ACPI_TRACE_OPCODE;
240 else if (!acpi_compare_param(val, "opcode"))
241 flags = ACPI_TRACE_ENABLED | ACPI_TRACE_OPCODE;
242 else
243 return -EINVAL;
244
245 status = acpi_debug_trace(method,
246 acpi_gbl_trace_dbg_level,
247 acpi_gbl_trace_dbg_layer,
248 flags);
249 if (ACPI_FAILURE(status))
250 return -EBUSY;
251
252 return 0;
253}
254
255static int param_get_trace_state(char *buffer, const struct kernel_param *kp)
256{
257 if (!(acpi_gbl_trace_flags & ACPI_TRACE_ENABLED))
258 return sprintf(buffer, "disable\n");
259 if (!acpi_gbl_trace_method_name)
260 return sprintf(buffer, "enable\n");
261 if (acpi_gbl_trace_flags & ACPI_TRACE_ONESHOT)
262 return sprintf(buffer, "method-once\n");
263 else
264 return sprintf(buffer, "method\n");
265}
266
267module_param_call(trace_state, param_set_trace_state, param_get_trace_state,
268 NULL, 0644);
269#endif /* CONFIG_ACPI_DEBUG */
270
271
272/* /sys/modules/acpi/parameters/aml_debug_output */
273
274module_param_named(aml_debug_output, acpi_gbl_enable_aml_debug_object,
275 byte, 0644);
276MODULE_PARM_DESC(aml_debug_output,
277 "To enable/disable the ACPI Debug Object output.");
278
279/* /sys/module/acpi/parameters/acpica_version */
280static int param_get_acpica_version(char *buffer,
281 const struct kernel_param *kp)
282{
283 int result;
284
285 result = sprintf(buffer, "%x\n", ACPI_CA_VERSION);
286
287 return result;
288}
289
290module_param_call(acpica_version, NULL, param_get_acpica_version, NULL, 0444);
291
292/*
293 * ACPI table sysfs I/F:
294 * /sys/firmware/acpi/tables/
295 * /sys/firmware/acpi/tables/data/
296 * /sys/firmware/acpi/tables/dynamic/
297 */
298
299static LIST_HEAD(acpi_table_attr_list);
300static struct kobject *tables_kobj;
301static struct kobject *tables_data_kobj;
302static struct kobject *dynamic_tables_kobj;
303static struct kobject *hotplug_kobj;
304
305#define ACPI_MAX_TABLE_INSTANCES 999
306#define ACPI_INST_SIZE 4 /* including trailing 0 */
307
308struct acpi_table_attr {
309 struct bin_attribute attr;
310 char name[ACPI_NAMESEG_SIZE];
311 int instance;
312 char filename[ACPI_NAMESEG_SIZE+ACPI_INST_SIZE];
313 struct list_head node;
314};
315
316struct acpi_data_attr {
317 struct bin_attribute attr;
318 u64 addr;
319};
320
321static ssize_t acpi_table_show(struct file *filp, struct kobject *kobj,
322 struct bin_attribute *bin_attr, char *buf,
323 loff_t offset, size_t count)
324{
325 struct acpi_table_attr *table_attr =
326 container_of(bin_attr, struct acpi_table_attr, attr);
327 struct acpi_table_header *table_header = NULL;
328 acpi_status status;
329 ssize_t rc;
330
331 status = acpi_get_table(table_attr->name, table_attr->instance,
332 &table_header);
333 if (ACPI_FAILURE(status))
334 return -ENODEV;
335
336 rc = memory_read_from_buffer(buf, count, &offset, table_header,
337 table_header->length);
338 acpi_put_table(table_header);
339 return rc;
340}
341
342static int acpi_table_attr_init(struct kobject *tables_obj,
343 struct acpi_table_attr *table_attr,
344 struct acpi_table_header *table_header)
345{
346 struct acpi_table_header *header = NULL;
347 struct acpi_table_attr *attr = NULL;
348 char instance_str[ACPI_INST_SIZE];
349
350 sysfs_attr_init(&table_attr->attr.attr);
351 ACPI_COPY_NAMESEG(table_attr->name, table_header->signature);
352
353 list_for_each_entry(attr, &acpi_table_attr_list, node) {
354 if (ACPI_COMPARE_NAMESEG(table_attr->name, attr->name))
355 if (table_attr->instance < attr->instance)
356 table_attr->instance = attr->instance;
357 }
358 table_attr->instance++;
359 if (table_attr->instance > ACPI_MAX_TABLE_INSTANCES) {
360 pr_warn("%4.4s: too many table instances\n", table_attr->name);
361 return -ERANGE;
362 }
363
364 ACPI_COPY_NAMESEG(table_attr->filename, table_header->signature);
365 table_attr->filename[ACPI_NAMESEG_SIZE] = '\0';
366 if (table_attr->instance > 1 || (table_attr->instance == 1 &&
367 !acpi_get_table
368 (table_header->signature, 2, &header))) {
369 snprintf(instance_str, sizeof(instance_str), "%u",
370 table_attr->instance);
371 strcat(table_attr->filename, instance_str);
372 }
373
374 table_attr->attr.size = table_header->length;
375 table_attr->attr.read = acpi_table_show;
376 table_attr->attr.attr.name = table_attr->filename;
377 table_attr->attr.attr.mode = 0400;
378
379 return sysfs_create_bin_file(tables_obj, &table_attr->attr);
380}
381
382acpi_status 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_INSTALL:
388 table_attr = kzalloc(sizeof(*table_attr), GFP_KERNEL);
389 if (!table_attr)
390 return AE_NO_MEMORY;
391
392 if (acpi_table_attr_init(dynamic_tables_kobj,
393 table_attr, table)) {
394 kfree(table_attr);
395 return AE_ERROR;
396 }
397 list_add_tail(&table_attr->node, &acpi_table_attr_list);
398 break;
399 case ACPI_TABLE_EVENT_LOAD:
400 case ACPI_TABLE_EVENT_UNLOAD:
401 case ACPI_TABLE_EVENT_UNINSTALL:
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
414static ssize_t acpi_data_show(struct file *filp, struct kobject *kobj,
415 struct bin_attribute *bin_attr, char *buf,
416 loff_t offset, size_t count)
417{
418 struct acpi_data_attr *data_attr;
419 void __iomem *base;
420 ssize_t size;
421
422 data_attr = container_of(bin_attr, struct acpi_data_attr, attr);
423 size = data_attr->attr.size;
424
425 if (offset < 0)
426 return -EINVAL;
427
428 if (offset >= size)
429 return 0;
430
431 if (count > size - offset)
432 count = size - offset;
433
434 base = acpi_os_map_iomem(data_attr->addr, size);
435 if (!base)
436 return -ENOMEM;
437
438 memcpy_fromio(buf, base + offset, count);
439
440 acpi_os_unmap_iomem(base, size);
441
442 return count;
443}
444
445static int acpi_bert_data_init(void *th, struct acpi_data_attr *data_attr)
446{
447 struct acpi_table_bert *bert = th;
448
449 if (bert->header.length < sizeof(struct acpi_table_bert) ||
450 bert->region_length < sizeof(struct acpi_hest_generic_status)) {
451 kfree(data_attr);
452 return -EINVAL;
453 }
454 data_attr->addr = bert->address;
455 data_attr->attr.size = bert->region_length;
456 data_attr->attr.attr.name = "BERT";
457
458 return sysfs_create_bin_file(tables_data_kobj, &data_attr->attr);
459}
460
461static struct acpi_data_obj {
462 char *name;
463 int (*fn)(void *, struct acpi_data_attr *);
464} acpi_data_objs[] = {
465 { ACPI_SIG_BERT, acpi_bert_data_init },
466};
467
468#define NUM_ACPI_DATA_OBJS ARRAY_SIZE(acpi_data_objs)
469
470static int acpi_table_data_init(struct acpi_table_header *th)
471{
472 struct acpi_data_attr *data_attr;
473 int i;
474
475 for (i = 0; i < NUM_ACPI_DATA_OBJS; i++) {
476 if (ACPI_COMPARE_NAMESEG(th->signature, acpi_data_objs[i].name)) {
477 data_attr = kzalloc(sizeof(*data_attr), GFP_KERNEL);
478 if (!data_attr)
479 return -ENOMEM;
480 sysfs_attr_init(&data_attr->attr.attr);
481 data_attr->attr.read = acpi_data_show;
482 data_attr->attr.attr.mode = 0400;
483 return acpi_data_objs[i].fn(th, data_attr);
484 }
485 }
486 return 0;
487}
488
489static int acpi_tables_sysfs_init(void)
490{
491 struct acpi_table_attr *table_attr;
492 struct acpi_table_header *table_header = NULL;
493 int table_index;
494 acpi_status status;
495 int ret;
496
497 tables_kobj = kobject_create_and_add("tables", acpi_kobj);
498 if (!tables_kobj)
499 goto err;
500
501 tables_data_kobj = kobject_create_and_add("data", tables_kobj);
502 if (!tables_data_kobj)
503 goto err_tables_data;
504
505 dynamic_tables_kobj = kobject_create_and_add("dynamic", tables_kobj);
506 if (!dynamic_tables_kobj)
507 goto err_dynamic_tables;
508
509 for (table_index = 0;; table_index++) {
510 status = acpi_get_table_by_index(table_index, &table_header);
511
512 if (status == AE_BAD_PARAMETER)
513 break;
514
515 if (ACPI_FAILURE(status))
516 continue;
517
518 table_attr = kzalloc(sizeof(*table_attr), GFP_KERNEL);
519 if (!table_attr)
520 return -ENOMEM;
521
522 ret = acpi_table_attr_init(tables_kobj,
523 table_attr, table_header);
524 if (ret) {
525 kfree(table_attr);
526 return ret;
527 }
528 list_add_tail(&table_attr->node, &acpi_table_attr_list);
529 acpi_table_data_init(table_header);
530 }
531
532 kobject_uevent(tables_kobj, KOBJ_ADD);
533 kobject_uevent(tables_data_kobj, KOBJ_ADD);
534 kobject_uevent(dynamic_tables_kobj, KOBJ_ADD);
535
536 return 0;
537err_dynamic_tables:
538 kobject_put(tables_data_kobj);
539err_tables_data:
540 kobject_put(tables_kobj);
541err:
542 return -ENOMEM;
543}
544
545/*
546 * Detailed ACPI IRQ counters:
547 * /sys/firmware/acpi/interrupts/
548 */
549
550u32 acpi_irq_handled;
551u32 acpi_irq_not_handled;
552
553#define COUNT_GPE 0
554#define COUNT_SCI 1 /* acpi_irq_handled */
555#define COUNT_SCI_NOT 2 /* acpi_irq_not_handled */
556#define COUNT_ERROR 3 /* other */
557#define NUM_COUNTERS_EXTRA 4
558
559struct event_counter {
560 u32 count;
561 u32 flags;
562};
563
564static struct event_counter *all_counters;
565static u32 num_gpes;
566static u32 num_counters;
567static struct attribute **all_attrs;
568static u32 acpi_gpe_count;
569
570static struct attribute_group interrupt_stats_attr_group = {
571 .name = "interrupts",
572};
573
574static struct kobj_attribute *counter_attrs;
575
576static void delete_gpe_attr_array(void)
577{
578 struct event_counter *tmp = all_counters;
579
580 all_counters = NULL;
581 kfree(tmp);
582
583 if (counter_attrs) {
584 int i;
585
586 for (i = 0; i < num_gpes; i++)
587 kfree(counter_attrs[i].attr.name);
588
589 kfree(counter_attrs);
590 }
591 kfree(all_attrs);
592}
593
594static void gpe_count(u32 gpe_number)
595{
596 acpi_gpe_count++;
597
598 if (!all_counters)
599 return;
600
601 if (gpe_number < num_gpes)
602 all_counters[gpe_number].count++;
603 else
604 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS +
605 COUNT_ERROR].count++;
606}
607
608static void fixed_event_count(u32 event_number)
609{
610 if (!all_counters)
611 return;
612
613 if (event_number < ACPI_NUM_FIXED_EVENTS)
614 all_counters[num_gpes + event_number].count++;
615 else
616 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS +
617 COUNT_ERROR].count++;
618}
619
620static void acpi_global_event_handler(u32 event_type, acpi_handle device,
621 u32 event_number, void *context)
622{
623 if (event_type == ACPI_EVENT_TYPE_GPE) {
624 gpe_count(event_number);
625 pr_debug("GPE event 0x%02x\n", event_number);
626 } else if (event_type == ACPI_EVENT_TYPE_FIXED) {
627 fixed_event_count(event_number);
628 pr_debug("Fixed event 0x%02x\n", event_number);
629 } else {
630 pr_debug("Other event 0x%02x\n", event_number);
631 }
632}
633
634static int get_status(u32 index, acpi_event_status *ret,
635 acpi_handle *handle)
636{
637 acpi_status status;
638
639 if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
640 return -EINVAL;
641
642 if (index < num_gpes) {
643 status = acpi_get_gpe_device(index, handle);
644 if (ACPI_FAILURE(status)) {
645 pr_warn("Invalid GPE 0x%x", index);
646 return -ENXIO;
647 }
648 status = acpi_get_gpe_status(*handle, index, ret);
649 } else {
650 status = acpi_get_event_status(index - num_gpes, ret);
651 }
652 if (ACPI_FAILURE(status))
653 return -EIO;
654
655 return 0;
656}
657
658static ssize_t counter_show(struct kobject *kobj,
659 struct kobj_attribute *attr, char *buf)
660{
661 int index = attr - counter_attrs;
662 int size;
663 acpi_handle handle;
664 acpi_event_status status;
665 int result = 0;
666
667 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI].count =
668 acpi_irq_handled;
669 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT].count =
670 acpi_irq_not_handled;
671 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE].count =
672 acpi_gpe_count;
673 size = sprintf(buf, "%8u", all_counters[index].count);
674
675 /* "gpe_all" or "sci" */
676 if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
677 goto end;
678
679 result = get_status(index, &status, &handle);
680 if (result)
681 goto end;
682
683 if (status & ACPI_EVENT_FLAG_ENABLE_SET)
684 size += sprintf(buf + size, " EN");
685 else
686 size += sprintf(buf + size, " ");
687 if (status & ACPI_EVENT_FLAG_STATUS_SET)
688 size += sprintf(buf + size, " STS");
689 else
690 size += sprintf(buf + size, " ");
691
692 if (!(status & ACPI_EVENT_FLAG_HAS_HANDLER))
693 size += sprintf(buf + size, " invalid ");
694 else if (status & ACPI_EVENT_FLAG_ENABLED)
695 size += sprintf(buf + size, " enabled ");
696 else if (status & ACPI_EVENT_FLAG_WAKE_ENABLED)
697 size += sprintf(buf + size, " wake_enabled");
698 else
699 size += sprintf(buf + size, " disabled ");
700 if (status & ACPI_EVENT_FLAG_MASKED)
701 size += sprintf(buf + size, " masked ");
702 else
703 size += sprintf(buf + size, " unmasked");
704
705end:
706 size += sprintf(buf + size, "\n");
707 return result ? result : size;
708}
709
710/*
711 * counter_set() sets the specified counter.
712 * setting the total "sci" file to any value clears all counters.
713 * enable/disable/clear a gpe/fixed event in user space.
714 */
715static ssize_t counter_set(struct kobject *kobj,
716 struct kobj_attribute *attr, const char *buf,
717 size_t size)
718{
719 int index = attr - counter_attrs;
720 acpi_event_status status;
721 acpi_handle handle;
722 int result = 0;
723 unsigned long tmp;
724
725 if (index == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI) {
726 int i;
727 for (i = 0; i < num_counters; ++i)
728 all_counters[i].count = 0;
729 acpi_gpe_count = 0;
730 acpi_irq_handled = 0;
731 acpi_irq_not_handled = 0;
732 goto end;
733 }
734
735 /* show the event status for both GPEs and Fixed Events */
736 result = get_status(index, &status, &handle);
737 if (result)
738 goto end;
739
740 if (!(status & ACPI_EVENT_FLAG_HAS_HANDLER)) {
741 pr_warn("Can not change Invalid GPE/Fixed Event status\n");
742 return -EINVAL;
743 }
744
745 if (index < num_gpes) {
746 if (!strcmp(buf, "disable\n") &&
747 (status & ACPI_EVENT_FLAG_ENABLED))
748 result = acpi_disable_gpe(handle, index);
749 else if (!strcmp(buf, "enable\n") &&
750 !(status & ACPI_EVENT_FLAG_ENABLED))
751 result = acpi_enable_gpe(handle, index);
752 else if (!strcmp(buf, "clear\n") &&
753 (status & ACPI_EVENT_FLAG_STATUS_SET))
754 result = acpi_clear_gpe(handle, index);
755 else if (!strcmp(buf, "mask\n"))
756 result = acpi_mask_gpe(handle, index, TRUE);
757 else if (!strcmp(buf, "unmask\n"))
758 result = acpi_mask_gpe(handle, index, FALSE);
759 else if (!kstrtoul(buf, 0, &tmp))
760 all_counters[index].count = tmp;
761 else
762 result = -EINVAL;
763 } else if (index < num_gpes + ACPI_NUM_FIXED_EVENTS) {
764 int event = index - num_gpes;
765 if (!strcmp(buf, "disable\n") &&
766 (status & ACPI_EVENT_FLAG_ENABLE_SET))
767 result = acpi_disable_event(event, ACPI_NOT_ISR);
768 else if (!strcmp(buf, "enable\n") &&
769 !(status & ACPI_EVENT_FLAG_ENABLE_SET))
770 result = acpi_enable_event(event, ACPI_NOT_ISR);
771 else if (!strcmp(buf, "clear\n") &&
772 (status & ACPI_EVENT_FLAG_STATUS_SET))
773 result = acpi_clear_event(event);
774 else if (!kstrtoul(buf, 0, &tmp))
775 all_counters[index].count = tmp;
776 else
777 result = -EINVAL;
778 } else
779 all_counters[index].count = strtoul(buf, NULL, 0);
780
781 if (ACPI_FAILURE(result))
782 result = -EINVAL;
783end:
784 return result ? result : size;
785}
786
787/*
788 * A Quirk Mechanism for GPE Flooding Prevention:
789 *
790 * Quirks may be needed to prevent GPE flooding on a specific GPE. The
791 * flooding typically cannot be detected and automatically prevented by
792 * ACPI_GPE_DISPATCH_NONE check because there is a _Lxx/_Exx prepared in
793 * the AML tables. This normally indicates a feature gap in Linux, thus
794 * instead of providing endless quirk tables, we provide a boot parameter
795 * for those who want this quirk. For example, if the users want to prevent
796 * the GPE flooding for GPE 00, they need to specify the following boot
797 * parameter:
798 * acpi_mask_gpe=0x00
799 * Note, the parameter can be a list (see bitmap_parselist() for the details).
800 * The masking status can be modified by the following runtime controlling
801 * interface:
802 * echo unmask > /sys/firmware/acpi/interrupts/gpe00
803 */
804#define ACPI_MASKABLE_GPE_MAX 0x100
805static DECLARE_BITMAP(acpi_masked_gpes_map, ACPI_MASKABLE_GPE_MAX) __initdata;
806
807static int __init acpi_gpe_set_masked_gpes(char *val)
808{
809 int ret;
810 u8 gpe;
811
812 ret = kstrtou8(val, 0, &gpe);
813 if (ret) {
814 ret = bitmap_parselist(val, acpi_masked_gpes_map, ACPI_MASKABLE_GPE_MAX);
815 if (ret)
816 return ret;
817 } else
818 set_bit(gpe, acpi_masked_gpes_map);
819
820 return 1;
821}
822__setup("acpi_mask_gpe=", acpi_gpe_set_masked_gpes);
823
824void __init acpi_gpe_apply_masked_gpes(void)
825{
826 acpi_handle handle;
827 acpi_status status;
828 u16 gpe;
829
830 for_each_set_bit(gpe, acpi_masked_gpes_map, ACPI_MASKABLE_GPE_MAX) {
831 status = acpi_get_gpe_device(gpe, &handle);
832 if (ACPI_SUCCESS(status)) {
833 pr_info("Masking GPE 0x%x.\n", gpe);
834 (void)acpi_mask_gpe(handle, gpe, TRUE);
835 }
836 }
837}
838
839void acpi_irq_stats_init(void)
840{
841 acpi_status status;
842 int i;
843
844 if (all_counters)
845 return;
846
847 num_gpes = acpi_current_gpe_count;
848 num_counters = num_gpes + ACPI_NUM_FIXED_EVENTS + NUM_COUNTERS_EXTRA;
849
850 all_attrs = kcalloc(num_counters + 1, sizeof(*all_attrs), GFP_KERNEL);
851 if (all_attrs == NULL)
852 return;
853
854 all_counters = kcalloc(num_counters, sizeof(*all_counters), GFP_KERNEL);
855 if (all_counters == NULL)
856 goto fail;
857
858 status = acpi_install_global_event_handler(acpi_global_event_handler, NULL);
859 if (ACPI_FAILURE(status))
860 goto fail;
861
862 counter_attrs = kcalloc(num_counters, sizeof(*counter_attrs), GFP_KERNEL);
863 if (counter_attrs == NULL)
864 goto fail;
865
866 for (i = 0; i < num_counters; ++i) {
867 char buffer[12];
868 char *name;
869
870 if (i < num_gpes)
871 sprintf(buffer, "gpe%02X", i);
872 else if (i == num_gpes + ACPI_EVENT_PMTIMER)
873 sprintf(buffer, "ff_pmtimer");
874 else if (i == num_gpes + ACPI_EVENT_GLOBAL)
875 sprintf(buffer, "ff_gbl_lock");
876 else if (i == num_gpes + ACPI_EVENT_POWER_BUTTON)
877 sprintf(buffer, "ff_pwr_btn");
878 else if (i == num_gpes + ACPI_EVENT_SLEEP_BUTTON)
879 sprintf(buffer, "ff_slp_btn");
880 else if (i == num_gpes + ACPI_EVENT_RTC)
881 sprintf(buffer, "ff_rt_clk");
882 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE)
883 sprintf(buffer, "gpe_all");
884 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI)
885 sprintf(buffer, "sci");
886 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT)
887 sprintf(buffer, "sci_not");
888 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR)
889 sprintf(buffer, "error");
890 else
891 sprintf(buffer, "bug%02X", i);
892
893 name = kstrdup(buffer, GFP_KERNEL);
894 if (name == NULL)
895 goto fail;
896
897 sysfs_attr_init(&counter_attrs[i].attr);
898 counter_attrs[i].attr.name = name;
899 counter_attrs[i].attr.mode = 0644;
900 counter_attrs[i].show = counter_show;
901 counter_attrs[i].store = counter_set;
902
903 all_attrs[i] = &counter_attrs[i].attr;
904 }
905
906 interrupt_stats_attr_group.attrs = all_attrs;
907 if (!sysfs_create_group(acpi_kobj, &interrupt_stats_attr_group))
908 return;
909
910fail:
911 delete_gpe_attr_array();
912}
913
914static void __exit interrupt_stats_exit(void)
915{
916 sysfs_remove_group(acpi_kobj, &interrupt_stats_attr_group);
917
918 delete_gpe_attr_array();
919}
920
921static ssize_t pm_profile_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
922{
923 return sprintf(buf, "%d\n", acpi_gbl_FADT.preferred_profile);
924}
925
926static const struct kobj_attribute pm_profile_attr = __ATTR_RO(pm_profile);
927
928static ssize_t enabled_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
929{
930 struct acpi_hotplug_profile *hotplug = to_acpi_hotplug_profile(kobj);
931
932 return sprintf(buf, "%d\n", hotplug->enabled);
933}
934
935static ssize_t enabled_store(struct kobject *kobj, struct kobj_attribute *attr,
936 const char *buf, size_t size)
937{
938 struct acpi_hotplug_profile *hotplug = to_acpi_hotplug_profile(kobj);
939 unsigned int val;
940
941 if (kstrtouint(buf, 10, &val) || val > 1)
942 return -EINVAL;
943
944 acpi_scan_hotplug_enabled(hotplug, val);
945 return size;
946}
947
948static struct kobj_attribute hotplug_enabled_attr = __ATTR_RW(enabled);
949
950static struct attribute *hotplug_profile_attrs[] = {
951 &hotplug_enabled_attr.attr,
952 NULL
953};
954ATTRIBUTE_GROUPS(hotplug_profile);
955
956static struct kobj_type acpi_hotplug_profile_ktype = {
957 .sysfs_ops = &kobj_sysfs_ops,
958 .default_groups = hotplug_profile_groups,
959};
960
961void acpi_sysfs_add_hotplug_profile(struct acpi_hotplug_profile *hotplug,
962 const char *name)
963{
964 int error;
965
966 if (!hotplug_kobj)
967 goto err_out;
968
969 error = kobject_init_and_add(&hotplug->kobj,
970 &acpi_hotplug_profile_ktype, hotplug_kobj, "%s", name);
971 if (error) {
972 kobject_put(&hotplug->kobj);
973 goto err_out;
974 }
975
976 kobject_uevent(&hotplug->kobj, KOBJ_ADD);
977 return;
978
979 err_out:
980 pr_err("Unable to add hotplug profile '%s'\n", name);
981}
982
983static ssize_t force_remove_show(struct kobject *kobj,
984 struct kobj_attribute *attr, char *buf)
985{
986 return sprintf(buf, "%d\n", 0);
987}
988
989static ssize_t force_remove_store(struct kobject *kobj,
990 struct kobj_attribute *attr,
991 const char *buf, size_t size)
992{
993 bool val;
994 int ret;
995
996 ret = kstrtobool(buf, &val);
997 if (ret < 0)
998 return ret;
999
1000 if (val) {
1001 pr_err("Enabling force_remove is not supported anymore. Please report to linux-acpi@vger.kernel.org if you depend on this functionality\n");
1002 return -EINVAL;
1003 }
1004 return size;
1005}
1006
1007static const struct kobj_attribute force_remove_attr = __ATTR_RW(force_remove);
1008
1009int __init acpi_sysfs_init(void)
1010{
1011 int result;
1012
1013 result = acpi_tables_sysfs_init();
1014 if (result)
1015 return result;
1016
1017 hotplug_kobj = kobject_create_and_add("hotplug", acpi_kobj);
1018 if (!hotplug_kobj)
1019 return -ENOMEM;
1020
1021 result = sysfs_create_file(hotplug_kobj, &force_remove_attr.attr);
1022 if (result)
1023 return result;
1024
1025 result = sysfs_create_file(acpi_kobj, &pm_profile_attr.attr);
1026 return result;
1027}