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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") - 1)) {
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") - 1)) {
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
709int __init acpi_sysfs_init(void)
710{
711 int result;
712
713 result = acpi_tables_sysfs_init();
714
715 return result;
716}
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/moduleparam.h>
13
14#include "internal.h"
15
16#ifdef CONFIG_ACPI_DEBUG
17/*
18 * ACPI debug sysfs I/F, including:
19 * /sys/modules/acpi/parameters/debug_layer
20 * /sys/modules/acpi/parameters/debug_level
21 * /sys/modules/acpi/parameters/trace_method_name
22 * /sys/modules/acpi/parameters/trace_state
23 * /sys/modules/acpi/parameters/trace_debug_layer
24 * /sys/modules/acpi/parameters/trace_debug_level
25 */
26
27struct acpi_dlayer {
28 const char *name;
29 unsigned long value;
30};
31struct acpi_dlevel {
32 const char *name;
33 unsigned long value;
34};
35#define ACPI_DEBUG_INIT(v) { .name = #v, .value = v }
36
37static const struct acpi_dlayer acpi_debug_layers[] = {
38 ACPI_DEBUG_INIT(ACPI_UTILITIES),
39 ACPI_DEBUG_INIT(ACPI_HARDWARE),
40 ACPI_DEBUG_INIT(ACPI_EVENTS),
41 ACPI_DEBUG_INIT(ACPI_TABLES),
42 ACPI_DEBUG_INIT(ACPI_NAMESPACE),
43 ACPI_DEBUG_INIT(ACPI_PARSER),
44 ACPI_DEBUG_INIT(ACPI_DISPATCHER),
45 ACPI_DEBUG_INIT(ACPI_EXECUTER),
46 ACPI_DEBUG_INIT(ACPI_RESOURCES),
47 ACPI_DEBUG_INIT(ACPI_CA_DEBUGGER),
48 ACPI_DEBUG_INIT(ACPI_OS_SERVICES),
49 ACPI_DEBUG_INIT(ACPI_CA_DISASSEMBLER),
50 ACPI_DEBUG_INIT(ACPI_COMPILER),
51 ACPI_DEBUG_INIT(ACPI_TOOLS),
52};
53
54static const struct acpi_dlevel acpi_debug_levels[] = {
55 ACPI_DEBUG_INIT(ACPI_LV_INIT),
56 ACPI_DEBUG_INIT(ACPI_LV_DEBUG_OBJECT),
57 ACPI_DEBUG_INIT(ACPI_LV_INFO),
58 ACPI_DEBUG_INIT(ACPI_LV_REPAIR),
59 ACPI_DEBUG_INIT(ACPI_LV_TRACE_POINT),
60
61 ACPI_DEBUG_INIT(ACPI_LV_INIT_NAMES),
62 ACPI_DEBUG_INIT(ACPI_LV_PARSE),
63 ACPI_DEBUG_INIT(ACPI_LV_LOAD),
64 ACPI_DEBUG_INIT(ACPI_LV_DISPATCH),
65 ACPI_DEBUG_INIT(ACPI_LV_EXEC),
66 ACPI_DEBUG_INIT(ACPI_LV_NAMES),
67 ACPI_DEBUG_INIT(ACPI_LV_OPREGION),
68 ACPI_DEBUG_INIT(ACPI_LV_BFIELD),
69 ACPI_DEBUG_INIT(ACPI_LV_TABLES),
70 ACPI_DEBUG_INIT(ACPI_LV_VALUES),
71 ACPI_DEBUG_INIT(ACPI_LV_OBJECTS),
72 ACPI_DEBUG_INIT(ACPI_LV_RESOURCES),
73 ACPI_DEBUG_INIT(ACPI_LV_USER_REQUESTS),
74 ACPI_DEBUG_INIT(ACPI_LV_PACKAGE),
75
76 ACPI_DEBUG_INIT(ACPI_LV_ALLOCATIONS),
77 ACPI_DEBUG_INIT(ACPI_LV_FUNCTIONS),
78 ACPI_DEBUG_INIT(ACPI_LV_OPTIMIZATIONS),
79
80 ACPI_DEBUG_INIT(ACPI_LV_MUTEX),
81 ACPI_DEBUG_INIT(ACPI_LV_THREADS),
82 ACPI_DEBUG_INIT(ACPI_LV_IO),
83 ACPI_DEBUG_INIT(ACPI_LV_INTERRUPTS),
84
85 ACPI_DEBUG_INIT(ACPI_LV_AML_DISASSEMBLE),
86 ACPI_DEBUG_INIT(ACPI_LV_VERBOSE_INFO),
87 ACPI_DEBUG_INIT(ACPI_LV_FULL_TABLES),
88 ACPI_DEBUG_INIT(ACPI_LV_EVENTS),
89};
90
91static int param_get_debug_layer(char *buffer, const struct kernel_param *kp)
92{
93 int result = 0;
94 int i;
95
96 result = sprintf(buffer, "%-25s\tHex SET\n", "Description");
97
98 for (i = 0; i < ARRAY_SIZE(acpi_debug_layers); i++) {
99 result += sprintf(buffer + result, "%-25s\t0x%08lX [%c]\n",
100 acpi_debug_layers[i].name,
101 acpi_debug_layers[i].value,
102 (acpi_dbg_layer & acpi_debug_layers[i].value)
103 ? '*' : ' ');
104 }
105 result +=
106 sprintf(buffer + result, "%-25s\t0x%08X [%c]\n", "ACPI_ALL_DRIVERS",
107 ACPI_ALL_DRIVERS,
108 (acpi_dbg_layer & ACPI_ALL_DRIVERS) ==
109 ACPI_ALL_DRIVERS ? '*' : (acpi_dbg_layer & ACPI_ALL_DRIVERS)
110 == 0 ? ' ' : '-');
111 result +=
112 sprintf(buffer + result,
113 "--\ndebug_layer = 0x%08X ( * = enabled)\n",
114 acpi_dbg_layer);
115
116 return result;
117}
118
119static int param_get_debug_level(char *buffer, const struct kernel_param *kp)
120{
121 int result = 0;
122 int i;
123
124 result = sprintf(buffer, "%-25s\tHex SET\n", "Description");
125
126 for (i = 0; i < ARRAY_SIZE(acpi_debug_levels); i++) {
127 result += sprintf(buffer + result, "%-25s\t0x%08lX [%c]\n",
128 acpi_debug_levels[i].name,
129 acpi_debug_levels[i].value,
130 (acpi_dbg_level & acpi_debug_levels[i].value)
131 ? '*' : ' ');
132 }
133 result +=
134 sprintf(buffer + result, "--\ndebug_level = 0x%08X (* = enabled)\n",
135 acpi_dbg_level);
136
137 return result;
138}
139
140static const struct kernel_param_ops param_ops_debug_layer = {
141 .set = param_set_uint,
142 .get = param_get_debug_layer,
143};
144
145static const struct kernel_param_ops param_ops_debug_level = {
146 .set = param_set_uint,
147 .get = param_get_debug_level,
148};
149
150module_param_cb(debug_layer, ¶m_ops_debug_layer, &acpi_dbg_layer, 0644);
151module_param_cb(debug_level, ¶m_ops_debug_level, &acpi_dbg_level, 0644);
152
153static char trace_method_name[1024];
154
155static int param_set_trace_method_name(const char *val,
156 const struct kernel_param *kp)
157{
158 u32 saved_flags = 0;
159 bool is_abs_path = true;
160
161 if (*val != '\\')
162 is_abs_path = false;
163
164 if ((is_abs_path && strlen(val) > 1023) ||
165 (!is_abs_path && strlen(val) > 1022)) {
166 pr_err("%s: string parameter too long\n", kp->name);
167 return -ENOSPC;
168 }
169
170 /*
171 * It's not safe to update acpi_gbl_trace_method_name without
172 * having the tracer stopped, so we save the original tracer
173 * state and disable it.
174 */
175 saved_flags = acpi_gbl_trace_flags;
176 (void)acpi_debug_trace(NULL,
177 acpi_gbl_trace_dbg_level,
178 acpi_gbl_trace_dbg_layer,
179 0);
180
181 /* This is a hack. We can't kmalloc in early boot. */
182 if (is_abs_path)
183 strcpy(trace_method_name, val);
184 else {
185 trace_method_name[0] = '\\';
186 strcpy(trace_method_name+1, val);
187 }
188
189 /* Restore the original tracer state */
190 (void)acpi_debug_trace(trace_method_name,
191 acpi_gbl_trace_dbg_level,
192 acpi_gbl_trace_dbg_layer,
193 saved_flags);
194
195 return 0;
196}
197
198static int param_get_trace_method_name(char *buffer, const struct kernel_param *kp)
199{
200 return scnprintf(buffer, PAGE_SIZE, "%s\n", acpi_gbl_trace_method_name);
201}
202
203static const struct kernel_param_ops param_ops_trace_method = {
204 .set = param_set_trace_method_name,
205 .get = param_get_trace_method_name,
206};
207
208static const struct kernel_param_ops param_ops_trace_attrib = {
209 .set = param_set_uint,
210 .get = param_get_uint,
211};
212
213module_param_cb(trace_method_name, ¶m_ops_trace_method, &trace_method_name, 0644);
214module_param_cb(trace_debug_layer, ¶m_ops_trace_attrib, &acpi_gbl_trace_dbg_layer, 0644);
215module_param_cb(trace_debug_level, ¶m_ops_trace_attrib, &acpi_gbl_trace_dbg_level, 0644);
216
217static int param_set_trace_state(const char *val,
218 const struct kernel_param *kp)
219{
220 acpi_status status;
221 const char *method = trace_method_name;
222 u32 flags = 0;
223
224/* So "xxx-once" comparison should go prior than "xxx" comparison */
225#define acpi_compare_param(val, key) \
226 strncmp((val), (key), sizeof(key) - 1)
227
228 if (!acpi_compare_param(val, "enable")) {
229 method = NULL;
230 flags = ACPI_TRACE_ENABLED;
231 } else if (!acpi_compare_param(val, "disable"))
232 method = NULL;
233 else if (!acpi_compare_param(val, "method-once"))
234 flags = ACPI_TRACE_ENABLED | ACPI_TRACE_ONESHOT;
235 else if (!acpi_compare_param(val, "method"))
236 flags = ACPI_TRACE_ENABLED;
237 else if (!acpi_compare_param(val, "opcode-once"))
238 flags = ACPI_TRACE_ENABLED | ACPI_TRACE_ONESHOT | ACPI_TRACE_OPCODE;
239 else if (!acpi_compare_param(val, "opcode"))
240 flags = ACPI_TRACE_ENABLED | ACPI_TRACE_OPCODE;
241 else
242 return -EINVAL;
243
244 status = acpi_debug_trace(method,
245 acpi_gbl_trace_dbg_level,
246 acpi_gbl_trace_dbg_layer,
247 flags);
248 if (ACPI_FAILURE(status))
249 return -EBUSY;
250
251 return 0;
252}
253
254static int param_get_trace_state(char *buffer, const struct kernel_param *kp)
255{
256 if (!(acpi_gbl_trace_flags & ACPI_TRACE_ENABLED))
257 return sprintf(buffer, "disable\n");
258 if (!acpi_gbl_trace_method_name)
259 return sprintf(buffer, "enable\n");
260 if (acpi_gbl_trace_flags & ACPI_TRACE_ONESHOT)
261 return sprintf(buffer, "method-once\n");
262 else
263 return sprintf(buffer, "method\n");
264}
265
266module_param_call(trace_state, param_set_trace_state, param_get_trace_state,
267 NULL, 0644);
268#endif /* CONFIG_ACPI_DEBUG */
269
270
271/* /sys/modules/acpi/parameters/aml_debug_output */
272
273module_param_named(aml_debug_output, acpi_gbl_enable_aml_debug_object,
274 byte, 0644);
275MODULE_PARM_DESC(aml_debug_output,
276 "To enable/disable the ACPI Debug Object output.");
277
278/* /sys/module/acpi/parameters/acpica_version */
279static int param_get_acpica_version(char *buffer,
280 const struct kernel_param *kp)
281{
282 int result;
283
284 result = sprintf(buffer, "%x\n", ACPI_CA_VERSION);
285
286 return result;
287}
288
289module_param_call(acpica_version, NULL, param_get_acpica_version, NULL, 0444);
290
291/*
292 * ACPI table sysfs I/F:
293 * /sys/firmware/acpi/tables/
294 * /sys/firmware/acpi/tables/data/
295 * /sys/firmware/acpi/tables/dynamic/
296 */
297
298static LIST_HEAD(acpi_table_attr_list);
299static struct kobject *tables_kobj;
300static struct kobject *tables_data_kobj;
301static struct kobject *dynamic_tables_kobj;
302static struct kobject *hotplug_kobj;
303
304#define ACPI_MAX_TABLE_INSTANCES 999
305#define ACPI_INST_SIZE 4 /* including trailing 0 */
306
307struct acpi_table_attr {
308 struct bin_attribute attr;
309 char name[ACPI_NAMESEG_SIZE];
310 int instance;
311 char filename[ACPI_NAMESEG_SIZE+ACPI_INST_SIZE];
312 struct list_head node;
313};
314
315struct acpi_data_attr {
316 struct bin_attribute attr;
317 u64 addr;
318};
319
320static ssize_t acpi_table_show(struct file *filp, struct kobject *kobj,
321 struct bin_attribute *bin_attr, char *buf,
322 loff_t offset, size_t count)
323{
324 struct acpi_table_attr *table_attr =
325 container_of(bin_attr, struct acpi_table_attr, attr);
326 struct acpi_table_header *table_header = NULL;
327 acpi_status status;
328 ssize_t rc;
329
330 status = acpi_get_table(table_attr->name, table_attr->instance,
331 &table_header);
332 if (ACPI_FAILURE(status))
333 return -ENODEV;
334
335 rc = memory_read_from_buffer(buf, count, &offset, table_header,
336 table_header->length);
337 acpi_put_table(table_header);
338 return rc;
339}
340
341static int acpi_table_attr_init(struct kobject *tables_obj,
342 struct acpi_table_attr *table_attr,
343 struct acpi_table_header *table_header)
344{
345 struct acpi_table_header *header = NULL;
346 struct acpi_table_attr *attr = NULL;
347 char instance_str[ACPI_INST_SIZE];
348
349 sysfs_attr_init(&table_attr->attr.attr);
350 ACPI_COPY_NAMESEG(table_attr->name, table_header->signature);
351
352 list_for_each_entry(attr, &acpi_table_attr_list, node) {
353 if (ACPI_COMPARE_NAMESEG(table_attr->name, attr->name))
354 if (table_attr->instance < attr->instance)
355 table_attr->instance = attr->instance;
356 }
357 table_attr->instance++;
358 if (table_attr->instance > ACPI_MAX_TABLE_INSTANCES) {
359 pr_warn("%4.4s: too many table instances\n", table_attr->name);
360 return -ERANGE;
361 }
362
363 ACPI_COPY_NAMESEG(table_attr->filename, table_header->signature);
364 table_attr->filename[ACPI_NAMESEG_SIZE] = '\0';
365 if (table_attr->instance > 1 || (table_attr->instance == 1 &&
366 !acpi_get_table
367 (table_header->signature, 2, &header))) {
368 snprintf(instance_str, sizeof(instance_str), "%u",
369 table_attr->instance);
370 strcat(table_attr->filename, instance_str);
371 }
372
373 table_attr->attr.size = table_header->length;
374 table_attr->attr.read = acpi_table_show;
375 table_attr->attr.attr.name = table_attr->filename;
376 table_attr->attr.attr.mode = 0400;
377
378 return sysfs_create_bin_file(tables_obj, &table_attr->attr);
379}
380
381acpi_status acpi_sysfs_table_handler(u32 event, void *table, void *context)
382{
383 struct acpi_table_attr *table_attr;
384
385 switch (event) {
386 case ACPI_TABLE_EVENT_INSTALL:
387 table_attr = kzalloc(sizeof(*table_attr), GFP_KERNEL);
388 if (!table_attr)
389 return AE_NO_MEMORY;
390
391 if (acpi_table_attr_init(dynamic_tables_kobj,
392 table_attr, table)) {
393 kfree(table_attr);
394 return AE_ERROR;
395 }
396 list_add_tail(&table_attr->node, &acpi_table_attr_list);
397 break;
398 case ACPI_TABLE_EVENT_LOAD:
399 case ACPI_TABLE_EVENT_UNLOAD:
400 case ACPI_TABLE_EVENT_UNINSTALL:
401 /*
402 * we do not need to do anything right now
403 * because the table is not deleted from the
404 * global table list when unloading it.
405 */
406 break;
407 default:
408 return AE_BAD_PARAMETER;
409 }
410 return AE_OK;
411}
412
413static ssize_t acpi_data_show(struct file *filp, struct kobject *kobj,
414 struct bin_attribute *bin_attr, char *buf,
415 loff_t offset, size_t count)
416{
417 struct acpi_data_attr *data_attr;
418 void *base;
419 ssize_t rc;
420
421 data_attr = container_of(bin_attr, struct acpi_data_attr, attr);
422
423 base = acpi_os_map_memory(data_attr->addr, data_attr->attr.size);
424 if (!base)
425 return -ENOMEM;
426 rc = memory_read_from_buffer(buf, count, &offset, base,
427 data_attr->attr.size);
428 acpi_os_unmap_memory(base, data_attr->attr.size);
429
430 return rc;
431}
432
433static int acpi_bert_data_init(void *th, struct acpi_data_attr *data_attr)
434{
435 struct acpi_table_bert *bert = th;
436
437 if (bert->header.length < sizeof(struct acpi_table_bert) ||
438 bert->region_length < sizeof(struct acpi_hest_generic_status)) {
439 kfree(data_attr);
440 return -EINVAL;
441 }
442 data_attr->addr = bert->address;
443 data_attr->attr.size = bert->region_length;
444 data_attr->attr.attr.name = "BERT";
445
446 return sysfs_create_bin_file(tables_data_kobj, &data_attr->attr);
447}
448
449static struct acpi_data_obj {
450 char *name;
451 int (*fn)(void *, struct acpi_data_attr *);
452} acpi_data_objs[] = {
453 { ACPI_SIG_BERT, acpi_bert_data_init },
454};
455
456#define NUM_ACPI_DATA_OBJS ARRAY_SIZE(acpi_data_objs)
457
458static int acpi_table_data_init(struct acpi_table_header *th)
459{
460 struct acpi_data_attr *data_attr;
461 int i;
462
463 for (i = 0; i < NUM_ACPI_DATA_OBJS; i++) {
464 if (ACPI_COMPARE_NAMESEG(th->signature, acpi_data_objs[i].name)) {
465 data_attr = kzalloc(sizeof(*data_attr), GFP_KERNEL);
466 if (!data_attr)
467 return -ENOMEM;
468 sysfs_attr_init(&data_attr->attr.attr);
469 data_attr->attr.read = acpi_data_show;
470 data_attr->attr.attr.mode = 0400;
471 return acpi_data_objs[i].fn(th, data_attr);
472 }
473 }
474 return 0;
475}
476
477static int acpi_tables_sysfs_init(void)
478{
479 struct acpi_table_attr *table_attr;
480 struct acpi_table_header *table_header = NULL;
481 int table_index;
482 acpi_status status;
483 int ret;
484
485 tables_kobj = kobject_create_and_add("tables", acpi_kobj);
486 if (!tables_kobj)
487 goto err;
488
489 tables_data_kobj = kobject_create_and_add("data", tables_kobj);
490 if (!tables_data_kobj)
491 goto err_tables_data;
492
493 dynamic_tables_kobj = kobject_create_and_add("dynamic", tables_kobj);
494 if (!dynamic_tables_kobj)
495 goto err_dynamic_tables;
496
497 for (table_index = 0;; table_index++) {
498 status = acpi_get_table_by_index(table_index, &table_header);
499
500 if (status == AE_BAD_PARAMETER)
501 break;
502
503 if (ACPI_FAILURE(status))
504 continue;
505
506 table_attr = kzalloc(sizeof(*table_attr), GFP_KERNEL);
507 if (!table_attr)
508 return -ENOMEM;
509
510 ret = acpi_table_attr_init(tables_kobj,
511 table_attr, table_header);
512 if (ret) {
513 kfree(table_attr);
514 return ret;
515 }
516 list_add_tail(&table_attr->node, &acpi_table_attr_list);
517 acpi_table_data_init(table_header);
518 }
519
520 kobject_uevent(tables_kobj, KOBJ_ADD);
521 kobject_uevent(tables_data_kobj, KOBJ_ADD);
522 kobject_uevent(dynamic_tables_kobj, KOBJ_ADD);
523
524 return 0;
525err_dynamic_tables:
526 kobject_put(tables_data_kobj);
527err_tables_data:
528 kobject_put(tables_kobj);
529err:
530 return -ENOMEM;
531}
532
533/*
534 * Detailed ACPI IRQ counters:
535 * /sys/firmware/acpi/interrupts/
536 */
537
538u32 acpi_irq_handled;
539u32 acpi_irq_not_handled;
540
541#define COUNT_GPE 0
542#define COUNT_SCI 1 /* acpi_irq_handled */
543#define COUNT_SCI_NOT 2 /* acpi_irq_not_handled */
544#define COUNT_ERROR 3 /* other */
545#define NUM_COUNTERS_EXTRA 4
546
547struct event_counter {
548 u32 count;
549 u32 flags;
550};
551
552static struct event_counter *all_counters;
553static u32 num_gpes;
554static u32 num_counters;
555static struct attribute **all_attrs;
556static u32 acpi_gpe_count;
557
558static struct attribute_group interrupt_stats_attr_group = {
559 .name = "interrupts",
560};
561
562static struct kobj_attribute *counter_attrs;
563
564static void delete_gpe_attr_array(void)
565{
566 struct event_counter *tmp = all_counters;
567
568 all_counters = NULL;
569 kfree(tmp);
570
571 if (counter_attrs) {
572 int i;
573
574 for (i = 0; i < num_gpes; i++)
575 kfree(counter_attrs[i].attr.name);
576
577 kfree(counter_attrs);
578 }
579 kfree(all_attrs);
580}
581
582static void gpe_count(u32 gpe_number)
583{
584 acpi_gpe_count++;
585
586 if (!all_counters)
587 return;
588
589 if (gpe_number < num_gpes)
590 all_counters[gpe_number].count++;
591 else
592 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS +
593 COUNT_ERROR].count++;
594}
595
596static void fixed_event_count(u32 event_number)
597{
598 if (!all_counters)
599 return;
600
601 if (event_number < ACPI_NUM_FIXED_EVENTS)
602 all_counters[num_gpes + event_number].count++;
603 else
604 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS +
605 COUNT_ERROR].count++;
606}
607
608static void acpi_global_event_handler(u32 event_type, acpi_handle device,
609 u32 event_number, void *context)
610{
611 if (event_type == ACPI_EVENT_TYPE_GPE) {
612 gpe_count(event_number);
613 pr_debug("GPE event 0x%02x\n", event_number);
614 } else if (event_type == ACPI_EVENT_TYPE_FIXED) {
615 fixed_event_count(event_number);
616 pr_debug("Fixed event 0x%02x\n", event_number);
617 } else {
618 pr_debug("Other event 0x%02x\n", event_number);
619 }
620}
621
622static int get_status(u32 index, acpi_event_status *ret,
623 acpi_handle *handle)
624{
625 acpi_status status;
626
627 if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
628 return -EINVAL;
629
630 if (index < num_gpes) {
631 status = acpi_get_gpe_device(index, handle);
632 if (ACPI_FAILURE(status)) {
633 pr_warn("Invalid GPE 0x%x", index);
634 return -ENXIO;
635 }
636 status = acpi_get_gpe_status(*handle, index, ret);
637 } else {
638 status = acpi_get_event_status(index - num_gpes, ret);
639 }
640 if (ACPI_FAILURE(status))
641 return -EIO;
642
643 return 0;
644}
645
646static ssize_t counter_show(struct kobject *kobj,
647 struct kobj_attribute *attr, char *buf)
648{
649 int index = attr - counter_attrs;
650 int size;
651 acpi_handle handle;
652 acpi_event_status status;
653 int result = 0;
654
655 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI].count =
656 acpi_irq_handled;
657 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT].count =
658 acpi_irq_not_handled;
659 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE].count =
660 acpi_gpe_count;
661 size = sprintf(buf, "%8u", all_counters[index].count);
662
663 /* "gpe_all" or "sci" */
664 if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
665 goto end;
666
667 result = get_status(index, &status, &handle);
668 if (result)
669 goto end;
670
671 if (status & ACPI_EVENT_FLAG_ENABLE_SET)
672 size += sprintf(buf + size, " EN");
673 else
674 size += sprintf(buf + size, " ");
675 if (status & ACPI_EVENT_FLAG_STATUS_SET)
676 size += sprintf(buf + size, " STS");
677 else
678 size += sprintf(buf + size, " ");
679
680 if (!(status & ACPI_EVENT_FLAG_HAS_HANDLER))
681 size += sprintf(buf + size, " invalid ");
682 else if (status & ACPI_EVENT_FLAG_ENABLED)
683 size += sprintf(buf + size, " enabled ");
684 else if (status & ACPI_EVENT_FLAG_WAKE_ENABLED)
685 size += sprintf(buf + size, " wake_enabled");
686 else
687 size += sprintf(buf + size, " disabled ");
688 if (status & ACPI_EVENT_FLAG_MASKED)
689 size += sprintf(buf + size, " masked ");
690 else
691 size += sprintf(buf + size, " unmasked");
692
693end:
694 size += sprintf(buf + size, "\n");
695 return result ? result : size;
696}
697
698/*
699 * counter_set() sets the specified counter.
700 * setting the total "sci" file to any value clears all counters.
701 * enable/disable/clear a gpe/fixed event in user space.
702 */
703static ssize_t counter_set(struct kobject *kobj,
704 struct kobj_attribute *attr, const char *buf,
705 size_t size)
706{
707 int index = attr - counter_attrs;
708 acpi_event_status status;
709 acpi_handle handle;
710 int result = 0;
711 unsigned long tmp;
712
713 if (index == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI) {
714 int i;
715 for (i = 0; i < num_counters; ++i)
716 all_counters[i].count = 0;
717 acpi_gpe_count = 0;
718 acpi_irq_handled = 0;
719 acpi_irq_not_handled = 0;
720 goto end;
721 }
722
723 /* show the event status for both GPEs and Fixed Events */
724 result = get_status(index, &status, &handle);
725 if (result)
726 goto end;
727
728 if (!(status & ACPI_EVENT_FLAG_HAS_HANDLER)) {
729 pr_warn("Can not change Invalid GPE/Fixed Event status\n");
730 return -EINVAL;
731 }
732
733 if (index < num_gpes) {
734 if (!strcmp(buf, "disable\n") &&
735 (status & ACPI_EVENT_FLAG_ENABLED))
736 result = acpi_disable_gpe(handle, index);
737 else if (!strcmp(buf, "enable\n") &&
738 !(status & ACPI_EVENT_FLAG_ENABLED))
739 result = acpi_enable_gpe(handle, index);
740 else if (!strcmp(buf, "clear\n") &&
741 (status & ACPI_EVENT_FLAG_STATUS_SET))
742 result = acpi_clear_gpe(handle, index);
743 else if (!strcmp(buf, "mask\n"))
744 result = acpi_mask_gpe(handle, index, TRUE);
745 else if (!strcmp(buf, "unmask\n"))
746 result = acpi_mask_gpe(handle, index, FALSE);
747 else if (!kstrtoul(buf, 0, &tmp))
748 all_counters[index].count = tmp;
749 else
750 result = -EINVAL;
751 } else if (index < num_gpes + ACPI_NUM_FIXED_EVENTS) {
752 int event = index - num_gpes;
753 if (!strcmp(buf, "disable\n") &&
754 (status & ACPI_EVENT_FLAG_ENABLE_SET))
755 result = acpi_disable_event(event, ACPI_NOT_ISR);
756 else if (!strcmp(buf, "enable\n") &&
757 !(status & ACPI_EVENT_FLAG_ENABLE_SET))
758 result = acpi_enable_event(event, ACPI_NOT_ISR);
759 else if (!strcmp(buf, "clear\n") &&
760 (status & ACPI_EVENT_FLAG_STATUS_SET))
761 result = acpi_clear_event(event);
762 else if (!kstrtoul(buf, 0, &tmp))
763 all_counters[index].count = tmp;
764 else
765 result = -EINVAL;
766 } else
767 all_counters[index].count = strtoul(buf, NULL, 0);
768
769 if (ACPI_FAILURE(result))
770 result = -EINVAL;
771end:
772 return result ? result : size;
773}
774
775/*
776 * A Quirk Mechanism for GPE Flooding Prevention:
777 *
778 * Quirks may be needed to prevent GPE flooding on a specific GPE. The
779 * flooding typically cannot be detected and automatically prevented by
780 * ACPI_GPE_DISPATCH_NONE check because there is a _Lxx/_Exx prepared in
781 * the AML tables. This normally indicates a feature gap in Linux, thus
782 * instead of providing endless quirk tables, we provide a boot parameter
783 * for those who want this quirk. For example, if the users want to prevent
784 * the GPE flooding for GPE 00, they need to specify the following boot
785 * parameter:
786 * acpi_mask_gpe=0x00
787 * Note, the parameter can be a list (see bitmap_parselist() for the details).
788 * The masking status can be modified by the following runtime controlling
789 * interface:
790 * echo unmask > /sys/firmware/acpi/interrupts/gpe00
791 */
792#define ACPI_MASKABLE_GPE_MAX 0x100
793static DECLARE_BITMAP(acpi_masked_gpes_map, ACPI_MASKABLE_GPE_MAX) __initdata;
794
795static int __init acpi_gpe_set_masked_gpes(char *val)
796{
797 int ret;
798 u8 gpe;
799
800 ret = kstrtou8(val, 0, &gpe);
801 if (ret) {
802 ret = bitmap_parselist(val, acpi_masked_gpes_map, ACPI_MASKABLE_GPE_MAX);
803 if (ret)
804 return ret;
805 } else
806 set_bit(gpe, acpi_masked_gpes_map);
807
808 return 1;
809}
810__setup("acpi_mask_gpe=", acpi_gpe_set_masked_gpes);
811
812void __init acpi_gpe_apply_masked_gpes(void)
813{
814 acpi_handle handle;
815 acpi_status status;
816 u16 gpe;
817
818 for_each_set_bit(gpe, acpi_masked_gpes_map, ACPI_MASKABLE_GPE_MAX) {
819 status = acpi_get_gpe_device(gpe, &handle);
820 if (ACPI_SUCCESS(status)) {
821 pr_info("Masking GPE 0x%x.\n", gpe);
822 (void)acpi_mask_gpe(handle, gpe, TRUE);
823 }
824 }
825}
826
827void acpi_irq_stats_init(void)
828{
829 acpi_status status;
830 int i;
831
832 if (all_counters)
833 return;
834
835 num_gpes = acpi_current_gpe_count;
836 num_counters = num_gpes + ACPI_NUM_FIXED_EVENTS + NUM_COUNTERS_EXTRA;
837
838 all_attrs = kcalloc(num_counters + 1, sizeof(*all_attrs), GFP_KERNEL);
839 if (all_attrs == NULL)
840 return;
841
842 all_counters = kcalloc(num_counters, sizeof(*all_counters), GFP_KERNEL);
843 if (all_counters == NULL)
844 goto fail;
845
846 status = acpi_install_global_event_handler(acpi_global_event_handler, NULL);
847 if (ACPI_FAILURE(status))
848 goto fail;
849
850 counter_attrs = kcalloc(num_counters, sizeof(*counter_attrs), GFP_KERNEL);
851 if (counter_attrs == NULL)
852 goto fail;
853
854 for (i = 0; i < num_counters; ++i) {
855 char buffer[12];
856 char *name;
857
858 if (i < num_gpes)
859 sprintf(buffer, "gpe%02X", i);
860 else if (i == num_gpes + ACPI_EVENT_PMTIMER)
861 sprintf(buffer, "ff_pmtimer");
862 else if (i == num_gpes + ACPI_EVENT_GLOBAL)
863 sprintf(buffer, "ff_gbl_lock");
864 else if (i == num_gpes + ACPI_EVENT_POWER_BUTTON)
865 sprintf(buffer, "ff_pwr_btn");
866 else if (i == num_gpes + ACPI_EVENT_SLEEP_BUTTON)
867 sprintf(buffer, "ff_slp_btn");
868 else if (i == num_gpes + ACPI_EVENT_RTC)
869 sprintf(buffer, "ff_rt_clk");
870 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE)
871 sprintf(buffer, "gpe_all");
872 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI)
873 sprintf(buffer, "sci");
874 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT)
875 sprintf(buffer, "sci_not");
876 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR)
877 sprintf(buffer, "error");
878 else
879 sprintf(buffer, "bug%02X", i);
880
881 name = kstrdup(buffer, GFP_KERNEL);
882 if (name == NULL)
883 goto fail;
884
885 sysfs_attr_init(&counter_attrs[i].attr);
886 counter_attrs[i].attr.name = name;
887 counter_attrs[i].attr.mode = 0644;
888 counter_attrs[i].show = counter_show;
889 counter_attrs[i].store = counter_set;
890
891 all_attrs[i] = &counter_attrs[i].attr;
892 }
893
894 interrupt_stats_attr_group.attrs = all_attrs;
895 if (!sysfs_create_group(acpi_kobj, &interrupt_stats_attr_group))
896 return;
897
898fail:
899 delete_gpe_attr_array();
900}
901
902static void __exit interrupt_stats_exit(void)
903{
904 sysfs_remove_group(acpi_kobj, &interrupt_stats_attr_group);
905
906 delete_gpe_attr_array();
907}
908
909static ssize_t pm_profile_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
910{
911 return sprintf(buf, "%d\n", acpi_gbl_FADT.preferred_profile);
912}
913
914static const struct kobj_attribute pm_profile_attr = __ATTR_RO(pm_profile);
915
916static ssize_t enabled_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
917{
918 struct acpi_hotplug_profile *hotplug = to_acpi_hotplug_profile(kobj);
919
920 return sprintf(buf, "%d\n", hotplug->enabled);
921}
922
923static ssize_t enabled_store(struct kobject *kobj, struct kobj_attribute *attr,
924 const char *buf, size_t size)
925{
926 struct acpi_hotplug_profile *hotplug = to_acpi_hotplug_profile(kobj);
927 unsigned int val;
928
929 if (kstrtouint(buf, 10, &val) || val > 1)
930 return -EINVAL;
931
932 acpi_scan_hotplug_enabled(hotplug, val);
933 return size;
934}
935
936static struct kobj_attribute hotplug_enabled_attr = __ATTR_RW(enabled);
937
938static struct attribute *hotplug_profile_attrs[] = {
939 &hotplug_enabled_attr.attr,
940 NULL
941};
942
943static struct kobj_type acpi_hotplug_profile_ktype = {
944 .sysfs_ops = &kobj_sysfs_ops,
945 .default_attrs = hotplug_profile_attrs,
946};
947
948void acpi_sysfs_add_hotplug_profile(struct acpi_hotplug_profile *hotplug,
949 const char *name)
950{
951 int error;
952
953 if (!hotplug_kobj)
954 goto err_out;
955
956 error = kobject_init_and_add(&hotplug->kobj,
957 &acpi_hotplug_profile_ktype, hotplug_kobj, "%s", name);
958 if (error) {
959 kobject_put(&hotplug->kobj);
960 goto err_out;
961 }
962
963 kobject_uevent(&hotplug->kobj, KOBJ_ADD);
964 return;
965
966 err_out:
967 pr_err("Unable to add hotplug profile '%s'\n", name);
968}
969
970static ssize_t force_remove_show(struct kobject *kobj,
971 struct kobj_attribute *attr, char *buf)
972{
973 return sprintf(buf, "%d\n", 0);
974}
975
976static ssize_t force_remove_store(struct kobject *kobj,
977 struct kobj_attribute *attr,
978 const char *buf, size_t size)
979{
980 bool val;
981 int ret;
982
983 ret = strtobool(buf, &val);
984 if (ret < 0)
985 return ret;
986
987 if (val) {
988 pr_err("Enabling force_remove is not supported anymore. Please report to linux-acpi@vger.kernel.org if you depend on this functionality\n");
989 return -EINVAL;
990 }
991 return size;
992}
993
994static const struct kobj_attribute force_remove_attr = __ATTR_RW(force_remove);
995
996int __init acpi_sysfs_init(void)
997{
998 int result;
999
1000 result = acpi_tables_sysfs_init();
1001 if (result)
1002 return result;
1003
1004 hotplug_kobj = kobject_create_and_add("hotplug", acpi_kobj);
1005 if (!hotplug_kobj)
1006 return -ENOMEM;
1007
1008 result = sysfs_create_file(hotplug_kobj, &force_remove_attr.attr);
1009 if (result)
1010 return result;
1011
1012 result = sysfs_create_file(acpi_kobj, &pm_profile_attr.attr);
1013 return result;
1014}