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