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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * sysfs.c - ACPI sysfs interface to userspace.
4 */
5
6#define pr_fmt(fmt) "ACPI: " fmt
7
8#include <linux/init.h>
9#include <linux/kernel.h>
10#include <linux/moduleparam.h>
11#include <linux/acpi.h>
12
13#include "internal.h"
14
15#define _COMPONENT ACPI_SYSTEM_COMPONENT
16ACPI_MODULE_NAME("sysfs");
17
18#ifdef CONFIG_ACPI_DEBUG
19/*
20 * ACPI debug sysfs I/F, including:
21 * /sys/modules/acpi/parameters/debug_layer
22 * /sys/modules/acpi/parameters/debug_level
23 * /sys/modules/acpi/parameters/trace_method_name
24 * /sys/modules/acpi/parameters/trace_state
25 * /sys/modules/acpi/parameters/trace_debug_layer
26 * /sys/modules/acpi/parameters/trace_debug_level
27 */
28
29struct acpi_dlayer {
30 const char *name;
31 unsigned long value;
32};
33struct acpi_dlevel {
34 const char *name;
35 unsigned long value;
36};
37#define ACPI_DEBUG_INIT(v) { .name = #v, .value = v }
38
39static const struct acpi_dlayer acpi_debug_layers[] = {
40 ACPI_DEBUG_INIT(ACPI_UTILITIES),
41 ACPI_DEBUG_INIT(ACPI_HARDWARE),
42 ACPI_DEBUG_INIT(ACPI_EVENTS),
43 ACPI_DEBUG_INIT(ACPI_TABLES),
44 ACPI_DEBUG_INIT(ACPI_NAMESPACE),
45 ACPI_DEBUG_INIT(ACPI_PARSER),
46 ACPI_DEBUG_INIT(ACPI_DISPATCHER),
47 ACPI_DEBUG_INIT(ACPI_EXECUTER),
48 ACPI_DEBUG_INIT(ACPI_RESOURCES),
49 ACPI_DEBUG_INIT(ACPI_CA_DEBUGGER),
50 ACPI_DEBUG_INIT(ACPI_OS_SERVICES),
51 ACPI_DEBUG_INIT(ACPI_CA_DISASSEMBLER),
52 ACPI_DEBUG_INIT(ACPI_COMPILER),
53 ACPI_DEBUG_INIT(ACPI_TOOLS),
54
55 ACPI_DEBUG_INIT(ACPI_BUS_COMPONENT),
56 ACPI_DEBUG_INIT(ACPI_AC_COMPONENT),
57 ACPI_DEBUG_INIT(ACPI_BATTERY_COMPONENT),
58 ACPI_DEBUG_INIT(ACPI_BUTTON_COMPONENT),
59 ACPI_DEBUG_INIT(ACPI_SBS_COMPONENT),
60 ACPI_DEBUG_INIT(ACPI_FAN_COMPONENT),
61 ACPI_DEBUG_INIT(ACPI_PCI_COMPONENT),
62 ACPI_DEBUG_INIT(ACPI_POWER_COMPONENT),
63 ACPI_DEBUG_INIT(ACPI_CONTAINER_COMPONENT),
64 ACPI_DEBUG_INIT(ACPI_SYSTEM_COMPONENT),
65 ACPI_DEBUG_INIT(ACPI_THERMAL_COMPONENT),
66 ACPI_DEBUG_INIT(ACPI_MEMORY_DEVICE_COMPONENT),
67 ACPI_DEBUG_INIT(ACPI_VIDEO_COMPONENT),
68 ACPI_DEBUG_INIT(ACPI_PROCESSOR_COMPONENT),
69};
70
71static const struct acpi_dlevel acpi_debug_levels[] = {
72 ACPI_DEBUG_INIT(ACPI_LV_INIT),
73 ACPI_DEBUG_INIT(ACPI_LV_DEBUG_OBJECT),
74 ACPI_DEBUG_INIT(ACPI_LV_INFO),
75 ACPI_DEBUG_INIT(ACPI_LV_REPAIR),
76 ACPI_DEBUG_INIT(ACPI_LV_TRACE_POINT),
77
78 ACPI_DEBUG_INIT(ACPI_LV_INIT_NAMES),
79 ACPI_DEBUG_INIT(ACPI_LV_PARSE),
80 ACPI_DEBUG_INIT(ACPI_LV_LOAD),
81 ACPI_DEBUG_INIT(ACPI_LV_DISPATCH),
82 ACPI_DEBUG_INIT(ACPI_LV_EXEC),
83 ACPI_DEBUG_INIT(ACPI_LV_NAMES),
84 ACPI_DEBUG_INIT(ACPI_LV_OPREGION),
85 ACPI_DEBUG_INIT(ACPI_LV_BFIELD),
86 ACPI_DEBUG_INIT(ACPI_LV_TABLES),
87 ACPI_DEBUG_INIT(ACPI_LV_VALUES),
88 ACPI_DEBUG_INIT(ACPI_LV_OBJECTS),
89 ACPI_DEBUG_INIT(ACPI_LV_RESOURCES),
90 ACPI_DEBUG_INIT(ACPI_LV_USER_REQUESTS),
91 ACPI_DEBUG_INIT(ACPI_LV_PACKAGE),
92
93 ACPI_DEBUG_INIT(ACPI_LV_ALLOCATIONS),
94 ACPI_DEBUG_INIT(ACPI_LV_FUNCTIONS),
95 ACPI_DEBUG_INIT(ACPI_LV_OPTIMIZATIONS),
96
97 ACPI_DEBUG_INIT(ACPI_LV_MUTEX),
98 ACPI_DEBUG_INIT(ACPI_LV_THREADS),
99 ACPI_DEBUG_INIT(ACPI_LV_IO),
100 ACPI_DEBUG_INIT(ACPI_LV_INTERRUPTS),
101
102 ACPI_DEBUG_INIT(ACPI_LV_AML_DISASSEMBLE),
103 ACPI_DEBUG_INIT(ACPI_LV_VERBOSE_INFO),
104 ACPI_DEBUG_INIT(ACPI_LV_FULL_TABLES),
105 ACPI_DEBUG_INIT(ACPI_LV_EVENTS),
106};
107
108static int param_get_debug_layer(char *buffer, const struct kernel_param *kp)
109{
110 int result = 0;
111 int i;
112
113 result = sprintf(buffer, "%-25s\tHex SET\n", "Description");
114
115 for (i = 0; i < ARRAY_SIZE(acpi_debug_layers); i++) {
116 result += sprintf(buffer + result, "%-25s\t0x%08lX [%c]\n",
117 acpi_debug_layers[i].name,
118 acpi_debug_layers[i].value,
119 (acpi_dbg_layer & acpi_debug_layers[i].value)
120 ? '*' : ' ');
121 }
122 result +=
123 sprintf(buffer + result, "%-25s\t0x%08X [%c]\n", "ACPI_ALL_DRIVERS",
124 ACPI_ALL_DRIVERS,
125 (acpi_dbg_layer & ACPI_ALL_DRIVERS) ==
126 ACPI_ALL_DRIVERS ? '*' : (acpi_dbg_layer & ACPI_ALL_DRIVERS)
127 == 0 ? ' ' : '-');
128 result +=
129 sprintf(buffer + result,
130 "--\ndebug_layer = 0x%08X ( * = enabled)\n",
131 acpi_dbg_layer);
132
133 return result;
134}
135
136static int param_get_debug_level(char *buffer, const struct kernel_param *kp)
137{
138 int result = 0;
139 int i;
140
141 result = sprintf(buffer, "%-25s\tHex SET\n", "Description");
142
143 for (i = 0; i < ARRAY_SIZE(acpi_debug_levels); i++) {
144 result += sprintf(buffer + result, "%-25s\t0x%08lX [%c]\n",
145 acpi_debug_levels[i].name,
146 acpi_debug_levels[i].value,
147 (acpi_dbg_level & acpi_debug_levels[i].value)
148 ? '*' : ' ');
149 }
150 result +=
151 sprintf(buffer + result, "--\ndebug_level = 0x%08X (* = enabled)\n",
152 acpi_dbg_level);
153
154 return result;
155}
156
157static const struct kernel_param_ops param_ops_debug_layer = {
158 .set = param_set_uint,
159 .get = param_get_debug_layer,
160};
161
162static const struct kernel_param_ops param_ops_debug_level = {
163 .set = param_set_uint,
164 .get = param_get_debug_level,
165};
166
167module_param_cb(debug_layer, ¶m_ops_debug_layer, &acpi_dbg_layer, 0644);
168module_param_cb(debug_level, ¶m_ops_debug_level, &acpi_dbg_level, 0644);
169
170static char trace_method_name[1024];
171
172static int param_set_trace_method_name(const char *val,
173 const struct kernel_param *kp)
174{
175 u32 saved_flags = 0;
176 bool is_abs_path = true;
177
178 if (*val != '\\')
179 is_abs_path = false;
180
181 if ((is_abs_path && strlen(val) > 1023) ||
182 (!is_abs_path && strlen(val) > 1022)) {
183 pr_err("%s: string parameter too long\n", kp->name);
184 return -ENOSPC;
185 }
186
187 /*
188 * It's not safe to update acpi_gbl_trace_method_name without
189 * having the tracer stopped, so we save the original tracer
190 * state and disable it.
191 */
192 saved_flags = acpi_gbl_trace_flags;
193 (void)acpi_debug_trace(NULL,
194 acpi_gbl_trace_dbg_level,
195 acpi_gbl_trace_dbg_layer,
196 0);
197
198 /* This is a hack. We can't kmalloc in early boot. */
199 if (is_abs_path)
200 strcpy(trace_method_name, val);
201 else {
202 trace_method_name[0] = '\\';
203 strcpy(trace_method_name+1, val);
204 }
205
206 /* Restore the original tracer state */
207 (void)acpi_debug_trace(trace_method_name,
208 acpi_gbl_trace_dbg_level,
209 acpi_gbl_trace_dbg_layer,
210 saved_flags);
211
212 return 0;
213}
214
215static int param_get_trace_method_name(char *buffer, const struct kernel_param *kp)
216{
217 return scnprintf(buffer, PAGE_SIZE, "%s\n", acpi_gbl_trace_method_name);
218}
219
220static const struct kernel_param_ops param_ops_trace_method = {
221 .set = param_set_trace_method_name,
222 .get = param_get_trace_method_name,
223};
224
225static const struct kernel_param_ops param_ops_trace_attrib = {
226 .set = param_set_uint,
227 .get = param_get_uint,
228};
229
230module_param_cb(trace_method_name, ¶m_ops_trace_method, &trace_method_name, 0644);
231module_param_cb(trace_debug_layer, ¶m_ops_trace_attrib, &acpi_gbl_trace_dbg_layer, 0644);
232module_param_cb(trace_debug_level, ¶m_ops_trace_attrib, &acpi_gbl_trace_dbg_level, 0644);
233
234static int param_set_trace_state(const char *val,
235 const struct kernel_param *kp)
236{
237 acpi_status status;
238 const char *method = trace_method_name;
239 u32 flags = 0;
240
241/* So "xxx-once" comparison should go prior than "xxx" comparison */
242#define acpi_compare_param(val, key) \
243 strncmp((val), (key), sizeof(key) - 1)
244
245 if (!acpi_compare_param(val, "enable")) {
246 method = NULL;
247 flags = ACPI_TRACE_ENABLED;
248 } else if (!acpi_compare_param(val, "disable"))
249 method = NULL;
250 else if (!acpi_compare_param(val, "method-once"))
251 flags = ACPI_TRACE_ENABLED | ACPI_TRACE_ONESHOT;
252 else if (!acpi_compare_param(val, "method"))
253 flags = ACPI_TRACE_ENABLED;
254 else if (!acpi_compare_param(val, "opcode-once"))
255 flags = ACPI_TRACE_ENABLED | ACPI_TRACE_ONESHOT | ACPI_TRACE_OPCODE;
256 else if (!acpi_compare_param(val, "opcode"))
257 flags = ACPI_TRACE_ENABLED | ACPI_TRACE_OPCODE;
258 else
259 return -EINVAL;
260
261 status = acpi_debug_trace(method,
262 acpi_gbl_trace_dbg_level,
263 acpi_gbl_trace_dbg_layer,
264 flags);
265 if (ACPI_FAILURE(status))
266 return -EBUSY;
267
268 return 0;
269}
270
271static int param_get_trace_state(char *buffer, const struct kernel_param *kp)
272{
273 if (!(acpi_gbl_trace_flags & ACPI_TRACE_ENABLED))
274 return sprintf(buffer, "disable\n");
275 else {
276 if (acpi_gbl_trace_method_name) {
277 if (acpi_gbl_trace_flags & ACPI_TRACE_ONESHOT)
278 return sprintf(buffer, "method-once\n");
279 else
280 return sprintf(buffer, "method\n");
281 } else
282 return sprintf(buffer, "enable\n");
283 }
284 return 0;
285}
286
287module_param_call(trace_state, param_set_trace_state, param_get_trace_state,
288 NULL, 0644);
289#endif /* CONFIG_ACPI_DEBUG */
290
291
292/* /sys/modules/acpi/parameters/aml_debug_output */
293
294module_param_named(aml_debug_output, acpi_gbl_enable_aml_debug_object,
295 byte, 0644);
296MODULE_PARM_DESC(aml_debug_output,
297 "To enable/disable the ACPI Debug Object output.");
298
299/* /sys/module/acpi/parameters/acpica_version */
300static int param_get_acpica_version(char *buffer,
301 const struct kernel_param *kp)
302{
303 int result;
304
305 result = sprintf(buffer, "%x\n", ACPI_CA_VERSION);
306
307 return result;
308}
309
310module_param_call(acpica_version, NULL, param_get_acpica_version, NULL, 0444);
311
312/*
313 * ACPI table sysfs I/F:
314 * /sys/firmware/acpi/tables/
315 * /sys/firmware/acpi/tables/data/
316 * /sys/firmware/acpi/tables/dynamic/
317 */
318
319static LIST_HEAD(acpi_table_attr_list);
320static struct kobject *tables_kobj;
321static struct kobject *tables_data_kobj;
322static struct kobject *dynamic_tables_kobj;
323static struct kobject *hotplug_kobj;
324
325#define ACPI_MAX_TABLE_INSTANCES 999
326#define ACPI_INST_SIZE 4 /* including trailing 0 */
327
328struct acpi_table_attr {
329 struct bin_attribute attr;
330 char name[ACPI_NAMESEG_SIZE];
331 int instance;
332 char filename[ACPI_NAMESEG_SIZE+ACPI_INST_SIZE];
333 struct list_head node;
334};
335
336struct acpi_data_attr {
337 struct bin_attribute attr;
338 u64 addr;
339};
340
341static ssize_t acpi_table_show(struct file *filp, struct kobject *kobj,
342 struct bin_attribute *bin_attr, char *buf,
343 loff_t offset, size_t count)
344{
345 struct acpi_table_attr *table_attr =
346 container_of(bin_attr, struct acpi_table_attr, attr);
347 struct acpi_table_header *table_header = NULL;
348 acpi_status status;
349 ssize_t rc;
350
351 status = acpi_get_table(table_attr->name, table_attr->instance,
352 &table_header);
353 if (ACPI_FAILURE(status))
354 return -ENODEV;
355
356 rc = memory_read_from_buffer(buf, count, &offset, table_header,
357 table_header->length);
358 acpi_put_table(table_header);
359 return rc;
360}
361
362static int acpi_table_attr_init(struct kobject *tables_obj,
363 struct acpi_table_attr *table_attr,
364 struct acpi_table_header *table_header)
365{
366 struct acpi_table_header *header = NULL;
367 struct acpi_table_attr *attr = NULL;
368 char instance_str[ACPI_INST_SIZE];
369
370 sysfs_attr_init(&table_attr->attr.attr);
371 ACPI_COPY_NAMESEG(table_attr->name, table_header->signature);
372
373 list_for_each_entry(attr, &acpi_table_attr_list, node) {
374 if (ACPI_COMPARE_NAMESEG(table_attr->name, attr->name))
375 if (table_attr->instance < attr->instance)
376 table_attr->instance = attr->instance;
377 }
378 table_attr->instance++;
379 if (table_attr->instance > ACPI_MAX_TABLE_INSTANCES) {
380 pr_warn("%4.4s: too many table instances\n",
381 table_attr->name);
382 return -ERANGE;
383 }
384
385 ACPI_COPY_NAMESEG(table_attr->filename, table_header->signature);
386 table_attr->filename[ACPI_NAMESEG_SIZE] = '\0';
387 if (table_attr->instance > 1 || (table_attr->instance == 1 &&
388 !acpi_get_table
389 (table_header->signature, 2, &header))) {
390 snprintf(instance_str, sizeof(instance_str), "%u",
391 table_attr->instance);
392 strcat(table_attr->filename, instance_str);
393 }
394
395 table_attr->attr.size = table_header->length;
396 table_attr->attr.read = acpi_table_show;
397 table_attr->attr.attr.name = table_attr->filename;
398 table_attr->attr.attr.mode = 0400;
399
400 return sysfs_create_bin_file(tables_obj, &table_attr->attr);
401}
402
403acpi_status acpi_sysfs_table_handler(u32 event, void *table, void *context)
404{
405 struct acpi_table_attr *table_attr;
406
407 switch (event) {
408 case ACPI_TABLE_EVENT_INSTALL:
409 table_attr =
410 kzalloc(sizeof(struct acpi_table_attr), GFP_KERNEL);
411 if (!table_attr)
412 return AE_NO_MEMORY;
413
414 if (acpi_table_attr_init(dynamic_tables_kobj,
415 table_attr, table)) {
416 kfree(table_attr);
417 return AE_ERROR;
418 }
419 list_add_tail(&table_attr->node, &acpi_table_attr_list);
420 break;
421 case ACPI_TABLE_EVENT_LOAD:
422 case ACPI_TABLE_EVENT_UNLOAD:
423 case ACPI_TABLE_EVENT_UNINSTALL:
424 /*
425 * we do not need to do anything right now
426 * because the table is not deleted from the
427 * global table list when unloading it.
428 */
429 break;
430 default:
431 return AE_BAD_PARAMETER;
432 }
433 return AE_OK;
434}
435
436static ssize_t acpi_data_show(struct file *filp, struct kobject *kobj,
437 struct bin_attribute *bin_attr, char *buf,
438 loff_t offset, size_t count)
439{
440 struct acpi_data_attr *data_attr;
441 void __iomem *base;
442 ssize_t rc;
443
444 data_attr = container_of(bin_attr, struct acpi_data_attr, attr);
445
446 base = acpi_os_map_memory(data_attr->addr, data_attr->attr.size);
447 if (!base)
448 return -ENOMEM;
449 rc = memory_read_from_buffer(buf, count, &offset, base,
450 data_attr->attr.size);
451 acpi_os_unmap_memory(base, data_attr->attr.size);
452
453 return rc;
454}
455
456static int acpi_bert_data_init(void *th, struct acpi_data_attr *data_attr)
457{
458 struct acpi_table_bert *bert = th;
459
460 if (bert->header.length < sizeof(struct acpi_table_bert) ||
461 bert->region_length < sizeof(struct acpi_hest_generic_status)) {
462 kfree(data_attr);
463 return -EINVAL;
464 }
465 data_attr->addr = bert->address;
466 data_attr->attr.size = bert->region_length;
467 data_attr->attr.attr.name = "BERT";
468
469 return sysfs_create_bin_file(tables_data_kobj, &data_attr->attr);
470}
471
472static struct acpi_data_obj {
473 char *name;
474 int (*fn)(void *, struct acpi_data_attr *);
475} acpi_data_objs[] = {
476 { ACPI_SIG_BERT, acpi_bert_data_init },
477};
478
479#define NUM_ACPI_DATA_OBJS ARRAY_SIZE(acpi_data_objs)
480
481static int acpi_table_data_init(struct acpi_table_header *th)
482{
483 struct acpi_data_attr *data_attr;
484 int i;
485
486 for (i = 0; i < NUM_ACPI_DATA_OBJS; i++) {
487 if (ACPI_COMPARE_NAMESEG(th->signature, acpi_data_objs[i].name)) {
488 data_attr = kzalloc(sizeof(*data_attr), GFP_KERNEL);
489 if (!data_attr)
490 return -ENOMEM;
491 sysfs_attr_init(&data_attr->attr.attr);
492 data_attr->attr.read = acpi_data_show;
493 data_attr->attr.attr.mode = 0400;
494 return acpi_data_objs[i].fn(th, data_attr);
495 }
496 }
497 return 0;
498}
499
500static int acpi_tables_sysfs_init(void)
501{
502 struct acpi_table_attr *table_attr;
503 struct acpi_table_header *table_header = NULL;
504 int table_index;
505 acpi_status status;
506 int ret;
507
508 tables_kobj = kobject_create_and_add("tables", acpi_kobj);
509 if (!tables_kobj)
510 goto err;
511
512 tables_data_kobj = kobject_create_and_add("data", tables_kobj);
513 if (!tables_data_kobj)
514 goto err_tables_data;
515
516 dynamic_tables_kobj = kobject_create_and_add("dynamic", tables_kobj);
517 if (!dynamic_tables_kobj)
518 goto err_dynamic_tables;
519
520 for (table_index = 0;; table_index++) {
521 status = acpi_get_table_by_index(table_index, &table_header);
522
523 if (status == AE_BAD_PARAMETER)
524 break;
525
526 if (ACPI_FAILURE(status))
527 continue;
528
529 table_attr = kzalloc(sizeof(*table_attr), GFP_KERNEL);
530 if (!table_attr)
531 return -ENOMEM;
532
533 ret = acpi_table_attr_init(tables_kobj,
534 table_attr, table_header);
535 if (ret) {
536 kfree(table_attr);
537 return ret;
538 }
539 list_add_tail(&table_attr->node, &acpi_table_attr_list);
540 acpi_table_data_init(table_header);
541 }
542
543 kobject_uevent(tables_kobj, KOBJ_ADD);
544 kobject_uevent(tables_data_kobj, KOBJ_ADD);
545 kobject_uevent(dynamic_tables_kobj, KOBJ_ADD);
546
547 return 0;
548err_dynamic_tables:
549 kobject_put(tables_data_kobj);
550err_tables_data:
551 kobject_put(tables_kobj);
552err:
553 return -ENOMEM;
554}
555
556/*
557 * Detailed ACPI IRQ counters:
558 * /sys/firmware/acpi/interrupts/
559 */
560
561u32 acpi_irq_handled;
562u32 acpi_irq_not_handled;
563
564#define COUNT_GPE 0
565#define COUNT_SCI 1 /* acpi_irq_handled */
566#define COUNT_SCI_NOT 2 /* acpi_irq_not_handled */
567#define COUNT_ERROR 3 /* other */
568#define NUM_COUNTERS_EXTRA 4
569
570struct event_counter {
571 u32 count;
572 u32 flags;
573};
574
575static struct event_counter *all_counters;
576static u32 num_gpes;
577static u32 num_counters;
578static struct attribute **all_attrs;
579static u32 acpi_gpe_count;
580
581static struct attribute_group interrupt_stats_attr_group = {
582 .name = "interrupts",
583};
584
585static struct kobj_attribute *counter_attrs;
586
587static void delete_gpe_attr_array(void)
588{
589 struct event_counter *tmp = all_counters;
590
591 all_counters = NULL;
592 kfree(tmp);
593
594 if (counter_attrs) {
595 int i;
596
597 for (i = 0; i < num_gpes; i++)
598 kfree(counter_attrs[i].attr.name);
599
600 kfree(counter_attrs);
601 }
602 kfree(all_attrs);
603
604 return;
605}
606
607static void gpe_count(u32 gpe_number)
608{
609 acpi_gpe_count++;
610
611 if (!all_counters)
612 return;
613
614 if (gpe_number < num_gpes)
615 all_counters[gpe_number].count++;
616 else
617 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS +
618 COUNT_ERROR].count++;
619
620 return;
621}
622
623static void fixed_event_count(u32 event_number)
624{
625 if (!all_counters)
626 return;
627
628 if (event_number < ACPI_NUM_FIXED_EVENTS)
629 all_counters[num_gpes + event_number].count++;
630 else
631 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS +
632 COUNT_ERROR].count++;
633
634 return;
635}
636
637static void acpi_global_event_handler(u32 event_type, acpi_handle device,
638 u32 event_number, void *context)
639{
640 if (event_type == ACPI_EVENT_TYPE_GPE) {
641 gpe_count(event_number);
642 pr_debug("GPE event 0x%02x\n", event_number);
643 } else if (event_type == ACPI_EVENT_TYPE_FIXED) {
644 fixed_event_count(event_number);
645 pr_debug("Fixed event 0x%02x\n", event_number);
646 } else {
647 pr_debug("Other event 0x%02x\n", event_number);
648 }
649}
650
651static int get_status(u32 index, acpi_event_status *ret,
652 acpi_handle *handle)
653{
654 acpi_status status;
655
656 if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
657 return -EINVAL;
658
659 if (index < num_gpes) {
660 status = acpi_get_gpe_device(index, handle);
661 if (ACPI_FAILURE(status)) {
662 ACPI_EXCEPTION((AE_INFO, AE_NOT_FOUND,
663 "Invalid GPE 0x%x", index));
664 return -ENXIO;
665 }
666 status = acpi_get_gpe_status(*handle, index, ret);
667 } else {
668 status = acpi_get_event_status(index - num_gpes, ret);
669 }
670 if (ACPI_FAILURE(status))
671 return -EIO;
672
673 return 0;
674}
675
676static ssize_t counter_show(struct kobject *kobj,
677 struct kobj_attribute *attr, char *buf)
678{
679 int index = attr - counter_attrs;
680 int size;
681 acpi_handle handle;
682 acpi_event_status status;
683 int result = 0;
684
685 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI].count =
686 acpi_irq_handled;
687 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT].count =
688 acpi_irq_not_handled;
689 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE].count =
690 acpi_gpe_count;
691 size = sprintf(buf, "%8u", all_counters[index].count);
692
693 /* "gpe_all" or "sci" */
694 if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
695 goto end;
696
697 result = get_status(index, &status, &handle);
698 if (result)
699 goto end;
700
701 if (status & ACPI_EVENT_FLAG_ENABLE_SET)
702 size += sprintf(buf + size, " EN");
703 else
704 size += sprintf(buf + size, " ");
705 if (status & ACPI_EVENT_FLAG_STATUS_SET)
706 size += sprintf(buf + size, " STS");
707 else
708 size += sprintf(buf + size, " ");
709
710 if (!(status & ACPI_EVENT_FLAG_HAS_HANDLER))
711 size += sprintf(buf + size, " invalid ");
712 else if (status & ACPI_EVENT_FLAG_ENABLED)
713 size += sprintf(buf + size, " enabled ");
714 else if (status & ACPI_EVENT_FLAG_WAKE_ENABLED)
715 size += sprintf(buf + size, " wake_enabled");
716 else
717 size += sprintf(buf + size, " disabled ");
718 if (status & ACPI_EVENT_FLAG_MASKED)
719 size += sprintf(buf + size, " masked ");
720 else
721 size += sprintf(buf + size, " unmasked");
722
723end:
724 size += sprintf(buf + size, "\n");
725 return result ? result : size;
726}
727
728/*
729 * counter_set() sets the specified counter.
730 * setting the total "sci" file to any value clears all counters.
731 * enable/disable/clear a gpe/fixed event in user space.
732 */
733static ssize_t counter_set(struct kobject *kobj,
734 struct kobj_attribute *attr, const char *buf,
735 size_t size)
736{
737 int index = attr - counter_attrs;
738 acpi_event_status status;
739 acpi_handle handle;
740 int result = 0;
741 unsigned long tmp;
742
743 if (index == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI) {
744 int i;
745 for (i = 0; i < num_counters; ++i)
746 all_counters[i].count = 0;
747 acpi_gpe_count = 0;
748 acpi_irq_handled = 0;
749 acpi_irq_not_handled = 0;
750 goto end;
751 }
752
753 /* show the event status for both GPEs and Fixed Events */
754 result = get_status(index, &status, &handle);
755 if (result)
756 goto end;
757
758 if (!(status & ACPI_EVENT_FLAG_HAS_HANDLER)) {
759 printk(KERN_WARNING PREFIX
760 "Can not change Invalid GPE/Fixed Event status\n");
761 return -EINVAL;
762 }
763
764 if (index < num_gpes) {
765 if (!strcmp(buf, "disable\n") &&
766 (status & ACPI_EVENT_FLAG_ENABLED))
767 result = acpi_disable_gpe(handle, index);
768 else if (!strcmp(buf, "enable\n") &&
769 !(status & ACPI_EVENT_FLAG_ENABLED))
770 result = acpi_enable_gpe(handle, index);
771 else if (!strcmp(buf, "clear\n") &&
772 (status & ACPI_EVENT_FLAG_STATUS_SET))
773 result = acpi_clear_gpe(handle, index);
774 else if (!strcmp(buf, "mask\n"))
775 result = acpi_mask_gpe(handle, index, TRUE);
776 else if (!strcmp(buf, "unmask\n"))
777 result = acpi_mask_gpe(handle, index, FALSE);
778 else if (!kstrtoul(buf, 0, &tmp))
779 all_counters[index].count = tmp;
780 else
781 result = -EINVAL;
782 } else if (index < num_gpes + ACPI_NUM_FIXED_EVENTS) {
783 int event = index - num_gpes;
784 if (!strcmp(buf, "disable\n") &&
785 (status & ACPI_EVENT_FLAG_ENABLE_SET))
786 result = acpi_disable_event(event, ACPI_NOT_ISR);
787 else if (!strcmp(buf, "enable\n") &&
788 !(status & ACPI_EVENT_FLAG_ENABLE_SET))
789 result = acpi_enable_event(event, ACPI_NOT_ISR);
790 else if (!strcmp(buf, "clear\n") &&
791 (status & ACPI_EVENT_FLAG_STATUS_SET))
792 result = acpi_clear_event(event);
793 else if (!kstrtoul(buf, 0, &tmp))
794 all_counters[index].count = tmp;
795 else
796 result = -EINVAL;
797 } else
798 all_counters[index].count = strtoul(buf, NULL, 0);
799
800 if (ACPI_FAILURE(result))
801 result = -EINVAL;
802end:
803 return result ? result : size;
804}
805
806/*
807 * A Quirk Mechanism for GPE Flooding Prevention:
808 *
809 * Quirks may be needed to prevent GPE flooding on a specific GPE. The
810 * flooding typically cannot be detected and automatically prevented by
811 * ACPI_GPE_DISPATCH_NONE check because there is a _Lxx/_Exx prepared in
812 * the AML tables. This normally indicates a feature gap in Linux, thus
813 * instead of providing endless quirk tables, we provide a boot parameter
814 * for those who want this quirk. For example, if the users want to prevent
815 * the GPE flooding for GPE 00, they need to specify the following boot
816 * parameter:
817 * acpi_mask_gpe=0x00
818 * The masking status can be modified by the following runtime controlling
819 * interface:
820 * echo unmask > /sys/firmware/acpi/interrupts/gpe00
821 */
822#define ACPI_MASKABLE_GPE_MAX 0x100
823static DECLARE_BITMAP(acpi_masked_gpes_map, ACPI_MASKABLE_GPE_MAX) __initdata;
824
825static int __init acpi_gpe_set_masked_gpes(char *val)
826{
827 u8 gpe;
828
829 if (kstrtou8(val, 0, &gpe))
830 return -EINVAL;
831 set_bit(gpe, acpi_masked_gpes_map);
832
833 return 1;
834}
835__setup("acpi_mask_gpe=", acpi_gpe_set_masked_gpes);
836
837void __init acpi_gpe_apply_masked_gpes(void)
838{
839 acpi_handle handle;
840 acpi_status status;
841 u16 gpe;
842
843 for_each_set_bit(gpe, acpi_masked_gpes_map, ACPI_MASKABLE_GPE_MAX) {
844 status = acpi_get_gpe_device(gpe, &handle);
845 if (ACPI_SUCCESS(status)) {
846 pr_info("Masking GPE 0x%x.\n", gpe);
847 (void)acpi_mask_gpe(handle, gpe, TRUE);
848 }
849 }
850}
851
852void acpi_irq_stats_init(void)
853{
854 acpi_status status;
855 int i;
856
857 if (all_counters)
858 return;
859
860 num_gpes = acpi_current_gpe_count;
861 num_counters = num_gpes + ACPI_NUM_FIXED_EVENTS + NUM_COUNTERS_EXTRA;
862
863 all_attrs = kcalloc(num_counters + 1, sizeof(struct attribute *),
864 GFP_KERNEL);
865 if (all_attrs == NULL)
866 return;
867
868 all_counters = kcalloc(num_counters, sizeof(struct event_counter),
869 GFP_KERNEL);
870 if (all_counters == NULL)
871 goto fail;
872
873 status = acpi_install_global_event_handler(acpi_global_event_handler, NULL);
874 if (ACPI_FAILURE(status))
875 goto fail;
876
877 counter_attrs = kcalloc(num_counters, sizeof(struct kobj_attribute),
878 GFP_KERNEL);
879 if (counter_attrs == NULL)
880 goto fail;
881
882 for (i = 0; i < num_counters; ++i) {
883 char buffer[12];
884 char *name;
885
886 if (i < num_gpes)
887 sprintf(buffer, "gpe%02X", i);
888 else if (i == num_gpes + ACPI_EVENT_PMTIMER)
889 sprintf(buffer, "ff_pmtimer");
890 else if (i == num_gpes + ACPI_EVENT_GLOBAL)
891 sprintf(buffer, "ff_gbl_lock");
892 else if (i == num_gpes + ACPI_EVENT_POWER_BUTTON)
893 sprintf(buffer, "ff_pwr_btn");
894 else if (i == num_gpes + ACPI_EVENT_SLEEP_BUTTON)
895 sprintf(buffer, "ff_slp_btn");
896 else if (i == num_gpes + ACPI_EVENT_RTC)
897 sprintf(buffer, "ff_rt_clk");
898 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE)
899 sprintf(buffer, "gpe_all");
900 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI)
901 sprintf(buffer, "sci");
902 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT)
903 sprintf(buffer, "sci_not");
904 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR)
905 sprintf(buffer, "error");
906 else
907 sprintf(buffer, "bug%02X", i);
908
909 name = kstrdup(buffer, GFP_KERNEL);
910 if (name == NULL)
911 goto fail;
912
913 sysfs_attr_init(&counter_attrs[i].attr);
914 counter_attrs[i].attr.name = name;
915 counter_attrs[i].attr.mode = 0644;
916 counter_attrs[i].show = counter_show;
917 counter_attrs[i].store = counter_set;
918
919 all_attrs[i] = &counter_attrs[i].attr;
920 }
921
922 interrupt_stats_attr_group.attrs = all_attrs;
923 if (!sysfs_create_group(acpi_kobj, &interrupt_stats_attr_group))
924 return;
925
926fail:
927 delete_gpe_attr_array();
928 return;
929}
930
931static void __exit interrupt_stats_exit(void)
932{
933 sysfs_remove_group(acpi_kobj, &interrupt_stats_attr_group);
934
935 delete_gpe_attr_array();
936
937 return;
938}
939
940static ssize_t
941acpi_show_profile(struct kobject *kobj, struct kobj_attribute *attr,
942 char *buf)
943{
944 return sprintf(buf, "%d\n", acpi_gbl_FADT.preferred_profile);
945}
946
947static const struct kobj_attribute pm_profile_attr =
948 __ATTR(pm_profile, S_IRUGO, acpi_show_profile, NULL);
949
950static ssize_t hotplug_enabled_show(struct kobject *kobj,
951 struct kobj_attribute *attr, char *buf)
952{
953 struct acpi_hotplug_profile *hotplug = to_acpi_hotplug_profile(kobj);
954
955 return sprintf(buf, "%d\n", hotplug->enabled);
956}
957
958static ssize_t hotplug_enabled_store(struct kobject *kobj,
959 struct kobj_attribute *attr,
960 const char *buf, size_t size)
961{
962 struct acpi_hotplug_profile *hotplug = to_acpi_hotplug_profile(kobj);
963 unsigned int val;
964
965 if (kstrtouint(buf, 10, &val) || val > 1)
966 return -EINVAL;
967
968 acpi_scan_hotplug_enabled(hotplug, val);
969 return size;
970}
971
972static struct kobj_attribute hotplug_enabled_attr =
973 __ATTR(enabled, S_IRUGO | S_IWUSR, hotplug_enabled_show,
974 hotplug_enabled_store);
975
976static struct attribute *hotplug_profile_attrs[] = {
977 &hotplug_enabled_attr.attr,
978 NULL
979};
980
981static struct kobj_type acpi_hotplug_profile_ktype = {
982 .sysfs_ops = &kobj_sysfs_ops,
983 .default_attrs = hotplug_profile_attrs,
984};
985
986void acpi_sysfs_add_hotplug_profile(struct acpi_hotplug_profile *hotplug,
987 const char *name)
988{
989 int error;
990
991 if (!hotplug_kobj)
992 goto err_out;
993
994 error = kobject_init_and_add(&hotplug->kobj,
995 &acpi_hotplug_profile_ktype, hotplug_kobj, "%s", name);
996 if (error) {
997 kobject_put(&hotplug->kobj);
998 goto err_out;
999 }
1000
1001 kobject_uevent(&hotplug->kobj, KOBJ_ADD);
1002 return;
1003
1004 err_out:
1005 pr_err(PREFIX "Unable to add hotplug profile '%s'\n", name);
1006}
1007
1008static ssize_t force_remove_show(struct kobject *kobj,
1009 struct kobj_attribute *attr, char *buf)
1010{
1011 return sprintf(buf, "%d\n", 0);
1012}
1013
1014static ssize_t force_remove_store(struct kobject *kobj,
1015 struct kobj_attribute *attr,
1016 const char *buf, size_t size)
1017{
1018 bool val;
1019 int ret;
1020
1021 ret = strtobool(buf, &val);
1022 if (ret < 0)
1023 return ret;
1024
1025 if (val) {
1026 pr_err("Enabling force_remove is not supported anymore. Please report to linux-acpi@vger.kernel.org if you depend on this functionality\n");
1027 return -EINVAL;
1028 }
1029 return size;
1030}
1031
1032static const struct kobj_attribute force_remove_attr =
1033 __ATTR(force_remove, S_IRUGO | S_IWUSR, force_remove_show,
1034 force_remove_store);
1035
1036int __init acpi_sysfs_init(void)
1037{
1038 int result;
1039
1040 result = acpi_tables_sysfs_init();
1041 if (result)
1042 return result;
1043
1044 hotplug_kobj = kobject_create_and_add("hotplug", acpi_kobj);
1045 if (!hotplug_kobj)
1046 return -ENOMEM;
1047
1048 result = sysfs_create_file(hotplug_kobj, &force_remove_attr.attr);
1049 if (result)
1050 return result;
1051
1052 result = sysfs_create_file(acpi_kobj, &pm_profile_attr.attr);
1053 return result;
1054}
1/*
2 * sysfs.c - ACPI sysfs interface to userspace.
3 */
4
5#include <linux/init.h>
6#include <linux/kernel.h>
7#include <linux/moduleparam.h>
8#include <linux/acpi.h>
9
10#include "internal.h"
11
12#define _COMPONENT ACPI_SYSTEM_COMPONENT
13ACPI_MODULE_NAME("sysfs");
14
15#ifdef CONFIG_ACPI_DEBUG
16/*
17 * ACPI debug sysfs I/F, including:
18 * /sys/modules/acpi/parameters/debug_layer
19 * /sys/modules/acpi/parameters/debug_level
20 * /sys/modules/acpi/parameters/trace_method_name
21 * /sys/modules/acpi/parameters/trace_state
22 * /sys/modules/acpi/parameters/trace_debug_layer
23 * /sys/modules/acpi/parameters/trace_debug_level
24 */
25
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", sizeof("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", sizeof("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 byte, 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;
252static struct kobject *hotplug_kobj;
253
254struct acpi_table_attr {
255 struct bin_attribute attr;
256 char name[8];
257 int instance;
258 struct list_head node;
259};
260
261static ssize_t acpi_table_show(struct file *filp, struct kobject *kobj,
262 struct bin_attribute *bin_attr, char *buf,
263 loff_t offset, size_t count)
264{
265 struct acpi_table_attr *table_attr =
266 container_of(bin_attr, struct acpi_table_attr, attr);
267 struct acpi_table_header *table_header = NULL;
268 acpi_status status;
269 char name[ACPI_NAME_SIZE];
270
271 if (strncmp(table_attr->name, "NULL", 4))
272 memcpy(name, table_attr->name, ACPI_NAME_SIZE);
273 else
274 memcpy(name, "\0\0\0\0", 4);
275
276 status = acpi_get_table(name, table_attr->instance, &table_header);
277 if (ACPI_FAILURE(status))
278 return -ENODEV;
279
280 return memory_read_from_buffer(buf, count, &offset,
281 table_header, table_header->length);
282}
283
284static void acpi_table_attr_init(struct acpi_table_attr *table_attr,
285 struct acpi_table_header *table_header)
286{
287 struct acpi_table_header *header = NULL;
288 struct acpi_table_attr *attr = NULL;
289
290 sysfs_attr_init(&table_attr->attr.attr);
291 if (table_header->signature[0] != '\0')
292 memcpy(table_attr->name, table_header->signature,
293 ACPI_NAME_SIZE);
294 else
295 memcpy(table_attr->name, "NULL", 4);
296
297 list_for_each_entry(attr, &acpi_table_attr_list, node) {
298 if (!memcmp(table_attr->name, attr->name, ACPI_NAME_SIZE))
299 if (table_attr->instance < attr->instance)
300 table_attr->instance = attr->instance;
301 }
302 table_attr->instance++;
303
304 if (table_attr->instance > 1 || (table_attr->instance == 1 &&
305 !acpi_get_table
306 (table_header->signature, 2, &header)))
307 sprintf(table_attr->name + ACPI_NAME_SIZE, "%d",
308 table_attr->instance);
309
310 table_attr->attr.size = table_header->length;
311 table_attr->attr.read = acpi_table_show;
312 table_attr->attr.attr.name = table_attr->name;
313 table_attr->attr.attr.mode = 0400;
314
315 return;
316}
317
318static acpi_status
319acpi_sysfs_table_handler(u32 event, void *table, void *context)
320{
321 struct acpi_table_attr *table_attr;
322
323 switch (event) {
324 case ACPI_TABLE_EVENT_LOAD:
325 table_attr =
326 kzalloc(sizeof(struct acpi_table_attr), GFP_KERNEL);
327 if (!table_attr)
328 return AE_NO_MEMORY;
329
330 acpi_table_attr_init(table_attr, table);
331 if (sysfs_create_bin_file(dynamic_tables_kobj,
332 &table_attr->attr)) {
333 kfree(table_attr);
334 return AE_ERROR;
335 } else
336 list_add_tail(&table_attr->node, &acpi_table_attr_list);
337 break;
338 case ACPI_TABLE_EVENT_UNLOAD:
339 /*
340 * we do not need to do anything right now
341 * because the table is not deleted from the
342 * global table list when unloading it.
343 */
344 break;
345 default:
346 return AE_BAD_PARAMETER;
347 }
348 return AE_OK;
349}
350
351static int acpi_tables_sysfs_init(void)
352{
353 struct acpi_table_attr *table_attr;
354 struct acpi_table_header *table_header = NULL;
355 int table_index;
356 acpi_status status;
357 int ret;
358
359 tables_kobj = kobject_create_and_add("tables", acpi_kobj);
360 if (!tables_kobj)
361 goto err;
362
363 dynamic_tables_kobj = kobject_create_and_add("dynamic", tables_kobj);
364 if (!dynamic_tables_kobj)
365 goto err_dynamic_tables;
366
367 for (table_index = 0;; table_index++) {
368 status = acpi_get_table_by_index(table_index, &table_header);
369
370 if (status == AE_BAD_PARAMETER)
371 break;
372
373 if (ACPI_FAILURE(status))
374 continue;
375
376 table_attr = NULL;
377 table_attr = kzalloc(sizeof(*table_attr), GFP_KERNEL);
378 if (!table_attr)
379 return -ENOMEM;
380
381 acpi_table_attr_init(table_attr, table_header);
382 ret = sysfs_create_bin_file(tables_kobj, &table_attr->attr);
383 if (ret) {
384 kfree(table_attr);
385 return ret;
386 }
387 list_add_tail(&table_attr->node, &acpi_table_attr_list);
388 }
389
390 kobject_uevent(tables_kobj, KOBJ_ADD);
391 kobject_uevent(dynamic_tables_kobj, KOBJ_ADD);
392 status = acpi_install_table_handler(acpi_sysfs_table_handler, NULL);
393
394 return ACPI_FAILURE(status) ? -EINVAL : 0;
395err_dynamic_tables:
396 kobject_put(tables_kobj);
397err:
398 return -ENOMEM;
399}
400
401/*
402 * Detailed ACPI IRQ counters:
403 * /sys/firmware/acpi/interrupts/
404 */
405
406u32 acpi_irq_handled;
407u32 acpi_irq_not_handled;
408
409#define COUNT_GPE 0
410#define COUNT_SCI 1 /* acpi_irq_handled */
411#define COUNT_SCI_NOT 2 /* acpi_irq_not_handled */
412#define COUNT_ERROR 3 /* other */
413#define NUM_COUNTERS_EXTRA 4
414
415struct event_counter {
416 u32 count;
417 u32 flags;
418};
419
420static struct event_counter *all_counters;
421static u32 num_gpes;
422static u32 num_counters;
423static struct attribute **all_attrs;
424static u32 acpi_gpe_count;
425
426static struct attribute_group interrupt_stats_attr_group = {
427 .name = "interrupts",
428};
429
430static struct kobj_attribute *counter_attrs;
431
432static void delete_gpe_attr_array(void)
433{
434 struct event_counter *tmp = all_counters;
435
436 all_counters = NULL;
437 kfree(tmp);
438
439 if (counter_attrs) {
440 int i;
441
442 for (i = 0; i < num_gpes; i++)
443 kfree(counter_attrs[i].attr.name);
444
445 kfree(counter_attrs);
446 }
447 kfree(all_attrs);
448
449 return;
450}
451
452static void gpe_count(u32 gpe_number)
453{
454 acpi_gpe_count++;
455
456 if (!all_counters)
457 return;
458
459 if (gpe_number < num_gpes)
460 all_counters[gpe_number].count++;
461 else
462 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS +
463 COUNT_ERROR].count++;
464
465 return;
466}
467
468static void fixed_event_count(u32 event_number)
469{
470 if (!all_counters)
471 return;
472
473 if (event_number < ACPI_NUM_FIXED_EVENTS)
474 all_counters[num_gpes + event_number].count++;
475 else
476 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS +
477 COUNT_ERROR].count++;
478
479 return;
480}
481
482static void acpi_global_event_handler(u32 event_type, acpi_handle device,
483 u32 event_number, void *context)
484{
485 if (event_type == ACPI_EVENT_TYPE_GPE)
486 gpe_count(event_number);
487
488 if (event_type == ACPI_EVENT_TYPE_FIXED)
489 fixed_event_count(event_number);
490}
491
492static int get_status(u32 index, acpi_event_status *status,
493 acpi_handle *handle)
494{
495 int result = 0;
496
497 if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
498 goto end;
499
500 if (index < num_gpes) {
501 result = acpi_get_gpe_device(index, handle);
502 if (result) {
503 ACPI_EXCEPTION((AE_INFO, AE_NOT_FOUND,
504 "Invalid GPE 0x%x", index));
505 goto end;
506 }
507 result = acpi_get_gpe_status(*handle, index, status);
508 } else if (index < (num_gpes + ACPI_NUM_FIXED_EVENTS))
509 result = acpi_get_event_status(index - num_gpes, status);
510
511end:
512 return result;
513}
514
515static ssize_t counter_show(struct kobject *kobj,
516 struct kobj_attribute *attr, char *buf)
517{
518 int index = attr - counter_attrs;
519 int size;
520 acpi_handle handle;
521 acpi_event_status status;
522 int result = 0;
523
524 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI].count =
525 acpi_irq_handled;
526 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT].count =
527 acpi_irq_not_handled;
528 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE].count =
529 acpi_gpe_count;
530 size = sprintf(buf, "%8d", all_counters[index].count);
531
532 /* "gpe_all" or "sci" */
533 if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
534 goto end;
535
536 result = get_status(index, &status, &handle);
537 if (result)
538 goto end;
539
540 if (!(status & ACPI_EVENT_FLAG_HANDLE))
541 size += sprintf(buf + size, " invalid");
542 else if (status & ACPI_EVENT_FLAG_ENABLED)
543 size += sprintf(buf + size, " enabled");
544 else if (status & ACPI_EVENT_FLAG_WAKE_ENABLED)
545 size += sprintf(buf + size, " wake_enabled");
546 else
547 size += sprintf(buf + size, " disabled");
548
549end:
550 size += sprintf(buf + size, "\n");
551 return result ? result : size;
552}
553
554/*
555 * counter_set() sets the specified counter.
556 * setting the total "sci" file to any value clears all counters.
557 * enable/disable/clear a gpe/fixed event in user space.
558 */
559static ssize_t counter_set(struct kobject *kobj,
560 struct kobj_attribute *attr, const char *buf,
561 size_t size)
562{
563 int index = attr - counter_attrs;
564 acpi_event_status status;
565 acpi_handle handle;
566 int result = 0;
567 unsigned long tmp;
568
569 if (index == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI) {
570 int i;
571 for (i = 0; i < num_counters; ++i)
572 all_counters[i].count = 0;
573 acpi_gpe_count = 0;
574 acpi_irq_handled = 0;
575 acpi_irq_not_handled = 0;
576 goto end;
577 }
578
579 /* show the event status for both GPEs and Fixed Events */
580 result = get_status(index, &status, &handle);
581 if (result)
582 goto end;
583
584 if (!(status & ACPI_EVENT_FLAG_HANDLE)) {
585 printk(KERN_WARNING PREFIX
586 "Can not change Invalid GPE/Fixed Event status\n");
587 return -EINVAL;
588 }
589
590 if (index < num_gpes) {
591 if (!strcmp(buf, "disable\n") &&
592 (status & ACPI_EVENT_FLAG_ENABLED))
593 result = acpi_disable_gpe(handle, index);
594 else if (!strcmp(buf, "enable\n") &&
595 !(status & ACPI_EVENT_FLAG_ENABLED))
596 result = acpi_enable_gpe(handle, index);
597 else if (!strcmp(buf, "clear\n") &&
598 (status & ACPI_EVENT_FLAG_SET))
599 result = acpi_clear_gpe(handle, index);
600 else if (!kstrtoul(buf, 0, &tmp))
601 all_counters[index].count = tmp;
602 else
603 result = -EINVAL;
604 } else if (index < num_gpes + ACPI_NUM_FIXED_EVENTS) {
605 int event = index - num_gpes;
606 if (!strcmp(buf, "disable\n") &&
607 (status & ACPI_EVENT_FLAG_ENABLED))
608 result = acpi_disable_event(event, ACPI_NOT_ISR);
609 else if (!strcmp(buf, "enable\n") &&
610 !(status & ACPI_EVENT_FLAG_ENABLED))
611 result = acpi_enable_event(event, ACPI_NOT_ISR);
612 else if (!strcmp(buf, "clear\n") &&
613 (status & ACPI_EVENT_FLAG_SET))
614 result = acpi_clear_event(event);
615 else if (!kstrtoul(buf, 0, &tmp))
616 all_counters[index].count = tmp;
617 else
618 result = -EINVAL;
619 } else
620 all_counters[index].count = strtoul(buf, NULL, 0);
621
622 if (ACPI_FAILURE(result))
623 result = -EINVAL;
624end:
625 return result ? result : size;
626}
627
628void acpi_irq_stats_init(void)
629{
630 acpi_status status;
631 int i;
632
633 if (all_counters)
634 return;
635
636 num_gpes = acpi_current_gpe_count;
637 num_counters = num_gpes + ACPI_NUM_FIXED_EVENTS + NUM_COUNTERS_EXTRA;
638
639 all_attrs = kzalloc(sizeof(struct attribute *) * (num_counters + 1),
640 GFP_KERNEL);
641 if (all_attrs == NULL)
642 return;
643
644 all_counters = kzalloc(sizeof(struct event_counter) * (num_counters),
645 GFP_KERNEL);
646 if (all_counters == NULL)
647 goto fail;
648
649 status = acpi_install_global_event_handler(acpi_global_event_handler, NULL);
650 if (ACPI_FAILURE(status))
651 goto fail;
652
653 counter_attrs = kzalloc(sizeof(struct kobj_attribute) * (num_counters),
654 GFP_KERNEL);
655 if (counter_attrs == NULL)
656 goto fail;
657
658 for (i = 0; i < num_counters; ++i) {
659 char buffer[12];
660 char *name;
661
662 if (i < num_gpes)
663 sprintf(buffer, "gpe%02X", i);
664 else if (i == num_gpes + ACPI_EVENT_PMTIMER)
665 sprintf(buffer, "ff_pmtimer");
666 else if (i == num_gpes + ACPI_EVENT_GLOBAL)
667 sprintf(buffer, "ff_gbl_lock");
668 else if (i == num_gpes + ACPI_EVENT_POWER_BUTTON)
669 sprintf(buffer, "ff_pwr_btn");
670 else if (i == num_gpes + ACPI_EVENT_SLEEP_BUTTON)
671 sprintf(buffer, "ff_slp_btn");
672 else if (i == num_gpes + ACPI_EVENT_RTC)
673 sprintf(buffer, "ff_rt_clk");
674 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE)
675 sprintf(buffer, "gpe_all");
676 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI)
677 sprintf(buffer, "sci");
678 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT)
679 sprintf(buffer, "sci_not");
680 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR)
681 sprintf(buffer, "error");
682 else
683 sprintf(buffer, "bug%02X", i);
684
685 name = kstrdup(buffer, GFP_KERNEL);
686 if (name == NULL)
687 goto fail;
688
689 sysfs_attr_init(&counter_attrs[i].attr);
690 counter_attrs[i].attr.name = name;
691 counter_attrs[i].attr.mode = 0644;
692 counter_attrs[i].show = counter_show;
693 counter_attrs[i].store = counter_set;
694
695 all_attrs[i] = &counter_attrs[i].attr;
696 }
697
698 interrupt_stats_attr_group.attrs = all_attrs;
699 if (!sysfs_create_group(acpi_kobj, &interrupt_stats_attr_group))
700 return;
701
702fail:
703 delete_gpe_attr_array();
704 return;
705}
706
707static void __exit interrupt_stats_exit(void)
708{
709 sysfs_remove_group(acpi_kobj, &interrupt_stats_attr_group);
710
711 delete_gpe_attr_array();
712
713 return;
714}
715
716static ssize_t
717acpi_show_profile(struct device *dev, struct device_attribute *attr,
718 char *buf)
719{
720 return sprintf(buf, "%d\n", acpi_gbl_FADT.preferred_profile);
721}
722
723static const struct device_attribute pm_profile_attr =
724 __ATTR(pm_profile, S_IRUGO, acpi_show_profile, NULL);
725
726static ssize_t hotplug_enabled_show(struct kobject *kobj,
727 struct kobj_attribute *attr, char *buf)
728{
729 struct acpi_hotplug_profile *hotplug = to_acpi_hotplug_profile(kobj);
730
731 return sprintf(buf, "%d\n", hotplug->enabled);
732}
733
734static ssize_t hotplug_enabled_store(struct kobject *kobj,
735 struct kobj_attribute *attr,
736 const char *buf, size_t size)
737{
738 struct acpi_hotplug_profile *hotplug = to_acpi_hotplug_profile(kobj);
739 unsigned int val;
740
741 if (kstrtouint(buf, 10, &val) || val > 1)
742 return -EINVAL;
743
744 acpi_scan_hotplug_enabled(hotplug, val);
745 return size;
746}
747
748static struct kobj_attribute hotplug_enabled_attr =
749 __ATTR(enabled, S_IRUGO | S_IWUSR, hotplug_enabled_show,
750 hotplug_enabled_store);
751
752static struct attribute *hotplug_profile_attrs[] = {
753 &hotplug_enabled_attr.attr,
754 NULL
755};
756
757static struct kobj_type acpi_hotplug_profile_ktype = {
758 .sysfs_ops = &kobj_sysfs_ops,
759 .default_attrs = hotplug_profile_attrs,
760};
761
762void acpi_sysfs_add_hotplug_profile(struct acpi_hotplug_profile *hotplug,
763 const char *name)
764{
765 int error;
766
767 if (!hotplug_kobj)
768 goto err_out;
769
770 error = kobject_init_and_add(&hotplug->kobj,
771 &acpi_hotplug_profile_ktype, hotplug_kobj, "%s", name);
772 if (error)
773 goto err_out;
774
775 kobject_uevent(&hotplug->kobj, KOBJ_ADD);
776 return;
777
778 err_out:
779 pr_err(PREFIX "Unable to add hotplug profile '%s'\n", name);
780}
781
782static ssize_t force_remove_show(struct kobject *kobj,
783 struct kobj_attribute *attr, char *buf)
784{
785 return sprintf(buf, "%d\n", !!acpi_force_hot_remove);
786}
787
788static ssize_t force_remove_store(struct kobject *kobj,
789 struct kobj_attribute *attr,
790 const char *buf, size_t size)
791{
792 bool val;
793 int ret;
794
795 ret = strtobool(buf, &val);
796 if (ret < 0)
797 return ret;
798
799 lock_device_hotplug();
800 acpi_force_hot_remove = val;
801 unlock_device_hotplug();
802 return size;
803}
804
805static const struct kobj_attribute force_remove_attr =
806 __ATTR(force_remove, S_IRUGO | S_IWUSR, force_remove_show,
807 force_remove_store);
808
809int __init acpi_sysfs_init(void)
810{
811 int result;
812
813 result = acpi_tables_sysfs_init();
814 if (result)
815 return result;
816
817 hotplug_kobj = kobject_create_and_add("hotplug", acpi_kobj);
818 result = sysfs_create_file(hotplug_kobj, &force_remove_attr.attr);
819 if (result)
820 return result;
821
822 result = sysfs_create_file(acpi_kobj, &pm_profile_attr.attr);
823 return result;
824}