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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 ACPI_DEBUG_INIT(ACPI_LV_REPAIR),
73 ACPI_DEBUG_INIT(ACPI_LV_TRACE_POINT),
74
75 ACPI_DEBUG_INIT(ACPI_LV_INIT_NAMES),
76 ACPI_DEBUG_INIT(ACPI_LV_PARSE),
77 ACPI_DEBUG_INIT(ACPI_LV_LOAD),
78 ACPI_DEBUG_INIT(ACPI_LV_DISPATCH),
79 ACPI_DEBUG_INIT(ACPI_LV_EXEC),
80 ACPI_DEBUG_INIT(ACPI_LV_NAMES),
81 ACPI_DEBUG_INIT(ACPI_LV_OPREGION),
82 ACPI_DEBUG_INIT(ACPI_LV_BFIELD),
83 ACPI_DEBUG_INIT(ACPI_LV_TABLES),
84 ACPI_DEBUG_INIT(ACPI_LV_VALUES),
85 ACPI_DEBUG_INIT(ACPI_LV_OBJECTS),
86 ACPI_DEBUG_INIT(ACPI_LV_RESOURCES),
87 ACPI_DEBUG_INIT(ACPI_LV_USER_REQUESTS),
88 ACPI_DEBUG_INIT(ACPI_LV_PACKAGE),
89
90 ACPI_DEBUG_INIT(ACPI_LV_ALLOCATIONS),
91 ACPI_DEBUG_INIT(ACPI_LV_FUNCTIONS),
92 ACPI_DEBUG_INIT(ACPI_LV_OPTIMIZATIONS),
93
94 ACPI_DEBUG_INIT(ACPI_LV_MUTEX),
95 ACPI_DEBUG_INIT(ACPI_LV_THREADS),
96 ACPI_DEBUG_INIT(ACPI_LV_IO),
97 ACPI_DEBUG_INIT(ACPI_LV_INTERRUPTS),
98
99 ACPI_DEBUG_INIT(ACPI_LV_AML_DISASSEMBLE),
100 ACPI_DEBUG_INIT(ACPI_LV_VERBOSE_INFO),
101 ACPI_DEBUG_INIT(ACPI_LV_FULL_TABLES),
102 ACPI_DEBUG_INIT(ACPI_LV_EVENTS),
103};
104
105static int param_get_debug_layer(char *buffer, const struct kernel_param *kp)
106{
107 int result = 0;
108 int i;
109
110 result = sprintf(buffer, "%-25s\tHex SET\n", "Description");
111
112 for (i = 0; i < ARRAY_SIZE(acpi_debug_layers); i++) {
113 result += sprintf(buffer + result, "%-25s\t0x%08lX [%c]\n",
114 acpi_debug_layers[i].name,
115 acpi_debug_layers[i].value,
116 (acpi_dbg_layer & acpi_debug_layers[i].value)
117 ? '*' : ' ');
118 }
119 result +=
120 sprintf(buffer + result, "%-25s\t0x%08X [%c]\n", "ACPI_ALL_DRIVERS",
121 ACPI_ALL_DRIVERS,
122 (acpi_dbg_layer & ACPI_ALL_DRIVERS) ==
123 ACPI_ALL_DRIVERS ? '*' : (acpi_dbg_layer & ACPI_ALL_DRIVERS)
124 == 0 ? ' ' : '-');
125 result +=
126 sprintf(buffer + result,
127 "--\ndebug_layer = 0x%08X ( * = enabled)\n",
128 acpi_dbg_layer);
129
130 return result;
131}
132
133static int param_get_debug_level(char *buffer, const struct kernel_param *kp)
134{
135 int result = 0;
136 int i;
137
138 result = sprintf(buffer, "%-25s\tHex SET\n", "Description");
139
140 for (i = 0; i < ARRAY_SIZE(acpi_debug_levels); i++) {
141 result += sprintf(buffer + result, "%-25s\t0x%08lX [%c]\n",
142 acpi_debug_levels[i].name,
143 acpi_debug_levels[i].value,
144 (acpi_dbg_level & acpi_debug_levels[i].value)
145 ? '*' : ' ');
146 }
147 result +=
148 sprintf(buffer + result, "--\ndebug_level = 0x%08X (* = enabled)\n",
149 acpi_dbg_level);
150
151 return result;
152}
153
154static const struct kernel_param_ops param_ops_debug_layer = {
155 .set = param_set_uint,
156 .get = param_get_debug_layer,
157};
158
159static const struct kernel_param_ops param_ops_debug_level = {
160 .set = param_set_uint,
161 .get = param_get_debug_level,
162};
163
164module_param_cb(debug_layer, ¶m_ops_debug_layer, &acpi_dbg_layer, 0644);
165module_param_cb(debug_level, ¶m_ops_debug_level, &acpi_dbg_level, 0644);
166
167static char trace_method_name[1024];
168
169int param_set_trace_method_name(const char *val, const struct kernel_param *kp)
170{
171 u32 saved_flags = 0;
172 bool is_abs_path = true;
173
174 if (*val != '\\')
175 is_abs_path = false;
176
177 if ((is_abs_path && strlen(val) > 1023) ||
178 (!is_abs_path && strlen(val) > 1022)) {
179 pr_err("%s: string parameter too long\n", kp->name);
180 return -ENOSPC;
181 }
182
183 /*
184 * It's not safe to update acpi_gbl_trace_method_name without
185 * having the tracer stopped, so we save the original tracer
186 * state and disable it.
187 */
188 saved_flags = acpi_gbl_trace_flags;
189 (void)acpi_debug_trace(NULL,
190 acpi_gbl_trace_dbg_level,
191 acpi_gbl_trace_dbg_layer,
192 0);
193
194 /* This is a hack. We can't kmalloc in early boot. */
195 if (is_abs_path)
196 strcpy(trace_method_name, val);
197 else {
198 trace_method_name[0] = '\\';
199 strcpy(trace_method_name+1, val);
200 }
201
202 /* Restore the original tracer state */
203 (void)acpi_debug_trace(trace_method_name,
204 acpi_gbl_trace_dbg_level,
205 acpi_gbl_trace_dbg_layer,
206 saved_flags);
207
208 return 0;
209}
210
211static int param_get_trace_method_name(char *buffer, const struct kernel_param *kp)
212{
213 return scnprintf(buffer, PAGE_SIZE, "%s", acpi_gbl_trace_method_name);
214}
215
216static const struct kernel_param_ops param_ops_trace_method = {
217 .set = param_set_trace_method_name,
218 .get = param_get_trace_method_name,
219};
220
221static const struct kernel_param_ops param_ops_trace_attrib = {
222 .set = param_set_uint,
223 .get = param_get_uint,
224};
225
226module_param_cb(trace_method_name, ¶m_ops_trace_method, &trace_method_name, 0644);
227module_param_cb(trace_debug_layer, ¶m_ops_trace_attrib, &acpi_gbl_trace_dbg_layer, 0644);
228module_param_cb(trace_debug_level, ¶m_ops_trace_attrib, &acpi_gbl_trace_dbg_level, 0644);
229
230static int param_set_trace_state(const char *val, struct kernel_param *kp)
231{
232 acpi_status status;
233 const char *method = trace_method_name;
234 u32 flags = 0;
235
236/* So "xxx-once" comparison should go prior than "xxx" comparison */
237#define acpi_compare_param(val, key) \
238 strncmp((val), (key), sizeof(key) - 1)
239
240 if (!acpi_compare_param(val, "enable")) {
241 method = NULL;
242 flags = ACPI_TRACE_ENABLED;
243 } else if (!acpi_compare_param(val, "disable"))
244 method = NULL;
245 else if (!acpi_compare_param(val, "method-once"))
246 flags = ACPI_TRACE_ENABLED | ACPI_TRACE_ONESHOT;
247 else if (!acpi_compare_param(val, "method"))
248 flags = ACPI_TRACE_ENABLED;
249 else if (!acpi_compare_param(val, "opcode-once"))
250 flags = ACPI_TRACE_ENABLED | ACPI_TRACE_ONESHOT | ACPI_TRACE_OPCODE;
251 else if (!acpi_compare_param(val, "opcode"))
252 flags = ACPI_TRACE_ENABLED | ACPI_TRACE_OPCODE;
253 else
254 return -EINVAL;
255
256 status = acpi_debug_trace(method,
257 acpi_gbl_trace_dbg_level,
258 acpi_gbl_trace_dbg_layer,
259 flags);
260 if (ACPI_FAILURE(status))
261 return -EBUSY;
262
263 return 0;
264}
265
266static int param_get_trace_state(char *buffer, struct kernel_param *kp)
267{
268 if (!(acpi_gbl_trace_flags & ACPI_TRACE_ENABLED))
269 return sprintf(buffer, "disable");
270 else {
271 if (acpi_gbl_trace_method_name) {
272 if (acpi_gbl_trace_flags & ACPI_TRACE_ONESHOT)
273 return sprintf(buffer, "method-once");
274 else
275 return sprintf(buffer, "method");
276 } else
277 return sprintf(buffer, "enable");
278 }
279 return 0;
280}
281
282module_param_call(trace_state, param_set_trace_state, param_get_trace_state,
283 NULL, 0644);
284#endif /* CONFIG_ACPI_DEBUG */
285
286
287/* /sys/modules/acpi/parameters/aml_debug_output */
288
289module_param_named(aml_debug_output, acpi_gbl_enable_aml_debug_object,
290 byte, 0644);
291MODULE_PARM_DESC(aml_debug_output,
292 "To enable/disable the ACPI Debug Object output.");
293
294/* /sys/module/acpi/parameters/acpica_version */
295static int param_get_acpica_version(char *buffer, struct kernel_param *kp)
296{
297 int result;
298
299 result = sprintf(buffer, "%x", ACPI_CA_VERSION);
300
301 return result;
302}
303
304module_param_call(acpica_version, NULL, param_get_acpica_version, NULL, 0444);
305
306/*
307 * ACPI table sysfs I/F:
308 * /sys/firmware/acpi/tables/
309 * /sys/firmware/acpi/tables/dynamic/
310 */
311
312static LIST_HEAD(acpi_table_attr_list);
313static struct kobject *tables_kobj;
314static struct kobject *dynamic_tables_kobj;
315static struct kobject *hotplug_kobj;
316
317struct acpi_table_attr {
318 struct bin_attribute attr;
319 char name[8];
320 int instance;
321 struct list_head node;
322};
323
324static ssize_t acpi_table_show(struct file *filp, struct kobject *kobj,
325 struct bin_attribute *bin_attr, char *buf,
326 loff_t offset, size_t count)
327{
328 struct acpi_table_attr *table_attr =
329 container_of(bin_attr, struct acpi_table_attr, attr);
330 struct acpi_table_header *table_header = NULL;
331 acpi_status status;
332 char name[ACPI_NAME_SIZE];
333
334 if (strncmp(table_attr->name, "NULL", 4))
335 memcpy(name, table_attr->name, ACPI_NAME_SIZE);
336 else
337 memcpy(name, "\0\0\0\0", 4);
338
339 status = acpi_get_table(name, table_attr->instance, &table_header);
340 if (ACPI_FAILURE(status))
341 return -ENODEV;
342
343 return memory_read_from_buffer(buf, count, &offset,
344 table_header, table_header->length);
345}
346
347static void acpi_table_attr_init(struct acpi_table_attr *table_attr,
348 struct acpi_table_header *table_header)
349{
350 struct acpi_table_header *header = NULL;
351 struct acpi_table_attr *attr = NULL;
352
353 sysfs_attr_init(&table_attr->attr.attr);
354 if (table_header->signature[0] != '\0')
355 memcpy(table_attr->name, table_header->signature,
356 ACPI_NAME_SIZE);
357 else
358 memcpy(table_attr->name, "NULL", 4);
359
360 list_for_each_entry(attr, &acpi_table_attr_list, node) {
361 if (!memcmp(table_attr->name, attr->name, ACPI_NAME_SIZE))
362 if (table_attr->instance < attr->instance)
363 table_attr->instance = attr->instance;
364 }
365 table_attr->instance++;
366
367 if (table_attr->instance > 1 || (table_attr->instance == 1 &&
368 !acpi_get_table
369 (table_header->signature, 2, &header)))
370 sprintf(table_attr->name + ACPI_NAME_SIZE, "%d",
371 table_attr->instance);
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->name;
376 table_attr->attr.attr.mode = 0400;
377
378 return;
379}
380
381static acpi_status
382acpi_sysfs_table_handler(u32 event, void *table, void *context)
383{
384 struct acpi_table_attr *table_attr;
385
386 switch (event) {
387 case ACPI_TABLE_EVENT_LOAD:
388 table_attr =
389 kzalloc(sizeof(struct acpi_table_attr), GFP_KERNEL);
390 if (!table_attr)
391 return AE_NO_MEMORY;
392
393 acpi_table_attr_init(table_attr, table);
394 if (sysfs_create_bin_file(dynamic_tables_kobj,
395 &table_attr->attr)) {
396 kfree(table_attr);
397 return AE_ERROR;
398 } else
399 list_add_tail(&table_attr->node, &acpi_table_attr_list);
400 break;
401 case ACPI_TABLE_EVENT_UNLOAD:
402 /*
403 * we do not need to do anything right now
404 * because the table is not deleted from the
405 * global table list when unloading it.
406 */
407 break;
408 default:
409 return AE_BAD_PARAMETER;
410 }
411 return AE_OK;
412}
413
414static int acpi_tables_sysfs_init(void)
415{
416 struct acpi_table_attr *table_attr;
417 struct acpi_table_header *table_header = NULL;
418 int table_index;
419 acpi_status status;
420 int ret;
421
422 tables_kobj = kobject_create_and_add("tables", acpi_kobj);
423 if (!tables_kobj)
424 goto err;
425
426 dynamic_tables_kobj = kobject_create_and_add("dynamic", tables_kobj);
427 if (!dynamic_tables_kobj)
428 goto err_dynamic_tables;
429
430 for (table_index = 0;; table_index++) {
431 status = acpi_get_table_by_index(table_index, &table_header);
432
433 if (status == AE_BAD_PARAMETER)
434 break;
435
436 if (ACPI_FAILURE(status))
437 continue;
438
439 table_attr = NULL;
440 table_attr = kzalloc(sizeof(*table_attr), GFP_KERNEL);
441 if (!table_attr)
442 return -ENOMEM;
443
444 acpi_table_attr_init(table_attr, table_header);
445 ret = sysfs_create_bin_file(tables_kobj, &table_attr->attr);
446 if (ret) {
447 kfree(table_attr);
448 return ret;
449 }
450 list_add_tail(&table_attr->node, &acpi_table_attr_list);
451 }
452
453 kobject_uevent(tables_kobj, KOBJ_ADD);
454 kobject_uevent(dynamic_tables_kobj, KOBJ_ADD);
455 status = acpi_install_table_handler(acpi_sysfs_table_handler, NULL);
456
457 return ACPI_FAILURE(status) ? -EINVAL : 0;
458err_dynamic_tables:
459 kobject_put(tables_kobj);
460err:
461 return -ENOMEM;
462}
463
464/*
465 * Detailed ACPI IRQ counters:
466 * /sys/firmware/acpi/interrupts/
467 */
468
469u32 acpi_irq_handled;
470u32 acpi_irq_not_handled;
471
472#define COUNT_GPE 0
473#define COUNT_SCI 1 /* acpi_irq_handled */
474#define COUNT_SCI_NOT 2 /* acpi_irq_not_handled */
475#define COUNT_ERROR 3 /* other */
476#define NUM_COUNTERS_EXTRA 4
477
478struct event_counter {
479 u32 count;
480 u32 flags;
481};
482
483static struct event_counter *all_counters;
484static u32 num_gpes;
485static u32 num_counters;
486static struct attribute **all_attrs;
487static u32 acpi_gpe_count;
488
489static struct attribute_group interrupt_stats_attr_group = {
490 .name = "interrupts",
491};
492
493static struct kobj_attribute *counter_attrs;
494
495static void delete_gpe_attr_array(void)
496{
497 struct event_counter *tmp = all_counters;
498
499 all_counters = NULL;
500 kfree(tmp);
501
502 if (counter_attrs) {
503 int i;
504
505 for (i = 0; i < num_gpes; i++)
506 kfree(counter_attrs[i].attr.name);
507
508 kfree(counter_attrs);
509 }
510 kfree(all_attrs);
511
512 return;
513}
514
515static void gpe_count(u32 gpe_number)
516{
517 acpi_gpe_count++;
518
519 if (!all_counters)
520 return;
521
522 if (gpe_number < num_gpes)
523 all_counters[gpe_number].count++;
524 else
525 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS +
526 COUNT_ERROR].count++;
527
528 return;
529}
530
531static void fixed_event_count(u32 event_number)
532{
533 if (!all_counters)
534 return;
535
536 if (event_number < ACPI_NUM_FIXED_EVENTS)
537 all_counters[num_gpes + event_number].count++;
538 else
539 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS +
540 COUNT_ERROR].count++;
541
542 return;
543}
544
545static void acpi_global_event_handler(u32 event_type, acpi_handle device,
546 u32 event_number, void *context)
547{
548 if (event_type == ACPI_EVENT_TYPE_GPE)
549 gpe_count(event_number);
550
551 if (event_type == ACPI_EVENT_TYPE_FIXED)
552 fixed_event_count(event_number);
553}
554
555static int get_status(u32 index, acpi_event_status *status,
556 acpi_handle *handle)
557{
558 int result = 0;
559
560 if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
561 goto end;
562
563 if (index < num_gpes) {
564 result = acpi_get_gpe_device(index, handle);
565 if (result) {
566 ACPI_EXCEPTION((AE_INFO, AE_NOT_FOUND,
567 "Invalid GPE 0x%x", index));
568 goto end;
569 }
570 result = acpi_get_gpe_status(*handle, index, status);
571 } else if (index < (num_gpes + ACPI_NUM_FIXED_EVENTS))
572 result = acpi_get_event_status(index - num_gpes, status);
573
574end:
575 return result;
576}
577
578static ssize_t counter_show(struct kobject *kobj,
579 struct kobj_attribute *attr, char *buf)
580{
581 int index = attr - counter_attrs;
582 int size;
583 acpi_handle handle;
584 acpi_event_status status;
585 int result = 0;
586
587 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI].count =
588 acpi_irq_handled;
589 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT].count =
590 acpi_irq_not_handled;
591 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE].count =
592 acpi_gpe_count;
593 size = sprintf(buf, "%8u", all_counters[index].count);
594
595 /* "gpe_all" or "sci" */
596 if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
597 goto end;
598
599 result = get_status(index, &status, &handle);
600 if (result)
601 goto end;
602
603 if (!(status & ACPI_EVENT_FLAG_HAS_HANDLER))
604 size += sprintf(buf + size, " invalid");
605 else if (status & ACPI_EVENT_FLAG_ENABLED)
606 size += sprintf(buf + size, " enabled");
607 else if (status & ACPI_EVENT_FLAG_WAKE_ENABLED)
608 size += sprintf(buf + size, " wake_enabled");
609 else
610 size += sprintf(buf + size, " disabled");
611
612end:
613 size += sprintf(buf + size, "\n");
614 return result ? result : size;
615}
616
617/*
618 * counter_set() sets the specified counter.
619 * setting the total "sci" file to any value clears all counters.
620 * enable/disable/clear a gpe/fixed event in user space.
621 */
622static ssize_t counter_set(struct kobject *kobj,
623 struct kobj_attribute *attr, const char *buf,
624 size_t size)
625{
626 int index = attr - counter_attrs;
627 acpi_event_status status;
628 acpi_handle handle;
629 int result = 0;
630 unsigned long tmp;
631
632 if (index == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI) {
633 int i;
634 for (i = 0; i < num_counters; ++i)
635 all_counters[i].count = 0;
636 acpi_gpe_count = 0;
637 acpi_irq_handled = 0;
638 acpi_irq_not_handled = 0;
639 goto end;
640 }
641
642 /* show the event status for both GPEs and Fixed Events */
643 result = get_status(index, &status, &handle);
644 if (result)
645 goto end;
646
647 if (!(status & ACPI_EVENT_FLAG_HAS_HANDLER)) {
648 printk(KERN_WARNING PREFIX
649 "Can not change Invalid GPE/Fixed Event status\n");
650 return -EINVAL;
651 }
652
653 if (index < num_gpes) {
654 if (!strcmp(buf, "disable\n") &&
655 (status & ACPI_EVENT_FLAG_ENABLED))
656 result = acpi_disable_gpe(handle, index);
657 else if (!strcmp(buf, "enable\n") &&
658 !(status & ACPI_EVENT_FLAG_ENABLED))
659 result = acpi_enable_gpe(handle, index);
660 else if (!strcmp(buf, "clear\n") &&
661 (status & ACPI_EVENT_FLAG_SET))
662 result = acpi_clear_gpe(handle, index);
663 else if (!kstrtoul(buf, 0, &tmp))
664 all_counters[index].count = tmp;
665 else
666 result = -EINVAL;
667 } else if (index < num_gpes + ACPI_NUM_FIXED_EVENTS) {
668 int event = index - num_gpes;
669 if (!strcmp(buf, "disable\n") &&
670 (status & ACPI_EVENT_FLAG_ENABLED))
671 result = acpi_disable_event(event, ACPI_NOT_ISR);
672 else if (!strcmp(buf, "enable\n") &&
673 !(status & ACPI_EVENT_FLAG_ENABLED))
674 result = acpi_enable_event(event, ACPI_NOT_ISR);
675 else if (!strcmp(buf, "clear\n") &&
676 (status & ACPI_EVENT_FLAG_SET))
677 result = acpi_clear_event(event);
678 else if (!kstrtoul(buf, 0, &tmp))
679 all_counters[index].count = tmp;
680 else
681 result = -EINVAL;
682 } else
683 all_counters[index].count = strtoul(buf, NULL, 0);
684
685 if (ACPI_FAILURE(result))
686 result = -EINVAL;
687end:
688 return result ? result : size;
689}
690
691void acpi_irq_stats_init(void)
692{
693 acpi_status status;
694 int i;
695
696 if (all_counters)
697 return;
698
699 num_gpes = acpi_current_gpe_count;
700 num_counters = num_gpes + ACPI_NUM_FIXED_EVENTS + NUM_COUNTERS_EXTRA;
701
702 all_attrs = kzalloc(sizeof(struct attribute *) * (num_counters + 1),
703 GFP_KERNEL);
704 if (all_attrs == NULL)
705 return;
706
707 all_counters = kzalloc(sizeof(struct event_counter) * (num_counters),
708 GFP_KERNEL);
709 if (all_counters == NULL)
710 goto fail;
711
712 status = acpi_install_global_event_handler(acpi_global_event_handler, NULL);
713 if (ACPI_FAILURE(status))
714 goto fail;
715
716 counter_attrs = kzalloc(sizeof(struct kobj_attribute) * (num_counters),
717 GFP_KERNEL);
718 if (counter_attrs == NULL)
719 goto fail;
720
721 for (i = 0; i < num_counters; ++i) {
722 char buffer[12];
723 char *name;
724
725 if (i < num_gpes)
726 sprintf(buffer, "gpe%02X", i);
727 else if (i == num_gpes + ACPI_EVENT_PMTIMER)
728 sprintf(buffer, "ff_pmtimer");
729 else if (i == num_gpes + ACPI_EVENT_GLOBAL)
730 sprintf(buffer, "ff_gbl_lock");
731 else if (i == num_gpes + ACPI_EVENT_POWER_BUTTON)
732 sprintf(buffer, "ff_pwr_btn");
733 else if (i == num_gpes + ACPI_EVENT_SLEEP_BUTTON)
734 sprintf(buffer, "ff_slp_btn");
735 else if (i == num_gpes + ACPI_EVENT_RTC)
736 sprintf(buffer, "ff_rt_clk");
737 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE)
738 sprintf(buffer, "gpe_all");
739 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI)
740 sprintf(buffer, "sci");
741 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT)
742 sprintf(buffer, "sci_not");
743 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR)
744 sprintf(buffer, "error");
745 else
746 sprintf(buffer, "bug%02X", i);
747
748 name = kstrdup(buffer, GFP_KERNEL);
749 if (name == NULL)
750 goto fail;
751
752 sysfs_attr_init(&counter_attrs[i].attr);
753 counter_attrs[i].attr.name = name;
754 counter_attrs[i].attr.mode = 0644;
755 counter_attrs[i].show = counter_show;
756 counter_attrs[i].store = counter_set;
757
758 all_attrs[i] = &counter_attrs[i].attr;
759 }
760
761 interrupt_stats_attr_group.attrs = all_attrs;
762 if (!sysfs_create_group(acpi_kobj, &interrupt_stats_attr_group))
763 return;
764
765fail:
766 delete_gpe_attr_array();
767 return;
768}
769
770static void __exit interrupt_stats_exit(void)
771{
772 sysfs_remove_group(acpi_kobj, &interrupt_stats_attr_group);
773
774 delete_gpe_attr_array();
775
776 return;
777}
778
779static ssize_t
780acpi_show_profile(struct device *dev, struct device_attribute *attr,
781 char *buf)
782{
783 return sprintf(buf, "%d\n", acpi_gbl_FADT.preferred_profile);
784}
785
786static const struct device_attribute pm_profile_attr =
787 __ATTR(pm_profile, S_IRUGO, acpi_show_profile, NULL);
788
789static ssize_t hotplug_enabled_show(struct kobject *kobj,
790 struct kobj_attribute *attr, char *buf)
791{
792 struct acpi_hotplug_profile *hotplug = to_acpi_hotplug_profile(kobj);
793
794 return sprintf(buf, "%d\n", hotplug->enabled);
795}
796
797static ssize_t hotplug_enabled_store(struct kobject *kobj,
798 struct kobj_attribute *attr,
799 const char *buf, size_t size)
800{
801 struct acpi_hotplug_profile *hotplug = to_acpi_hotplug_profile(kobj);
802 unsigned int val;
803
804 if (kstrtouint(buf, 10, &val) || val > 1)
805 return -EINVAL;
806
807 acpi_scan_hotplug_enabled(hotplug, val);
808 return size;
809}
810
811static struct kobj_attribute hotplug_enabled_attr =
812 __ATTR(enabled, S_IRUGO | S_IWUSR, hotplug_enabled_show,
813 hotplug_enabled_store);
814
815static struct attribute *hotplug_profile_attrs[] = {
816 &hotplug_enabled_attr.attr,
817 NULL
818};
819
820static struct kobj_type acpi_hotplug_profile_ktype = {
821 .sysfs_ops = &kobj_sysfs_ops,
822 .default_attrs = hotplug_profile_attrs,
823};
824
825void acpi_sysfs_add_hotplug_profile(struct acpi_hotplug_profile *hotplug,
826 const char *name)
827{
828 int error;
829
830 if (!hotplug_kobj)
831 goto err_out;
832
833 error = kobject_init_and_add(&hotplug->kobj,
834 &acpi_hotplug_profile_ktype, hotplug_kobj, "%s", name);
835 if (error)
836 goto err_out;
837
838 kobject_uevent(&hotplug->kobj, KOBJ_ADD);
839 return;
840
841 err_out:
842 pr_err(PREFIX "Unable to add hotplug profile '%s'\n", name);
843}
844
845static ssize_t force_remove_show(struct kobject *kobj,
846 struct kobj_attribute *attr, char *buf)
847{
848 return sprintf(buf, "%d\n", !!acpi_force_hot_remove);
849}
850
851static ssize_t force_remove_store(struct kobject *kobj,
852 struct kobj_attribute *attr,
853 const char *buf, size_t size)
854{
855 bool val;
856 int ret;
857
858 ret = strtobool(buf, &val);
859 if (ret < 0)
860 return ret;
861
862 lock_device_hotplug();
863 acpi_force_hot_remove = val;
864 unlock_device_hotplug();
865 return size;
866}
867
868static const struct kobj_attribute force_remove_attr =
869 __ATTR(force_remove, S_IRUGO | S_IWUSR, force_remove_show,
870 force_remove_store);
871
872int __init acpi_sysfs_init(void)
873{
874 int result;
875
876 result = acpi_tables_sysfs_init();
877 if (result)
878 return result;
879
880 hotplug_kobj = kobject_create_and_add("hotplug", acpi_kobj);
881 if (!hotplug_kobj)
882 return -ENOMEM;
883
884 result = sysfs_create_file(hotplug_kobj, &force_remove_attr.attr);
885 if (result)
886 return result;
887
888 result = sysfs_create_file(acpi_kobj, &pm_profile_attr.attr);
889 return result;
890}