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