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
28 struct acpi_dlayer {
29 const char *name;
30 unsigned long value;
31 };
32 struct acpi_dlevel {
33 const char *name;
34 unsigned long value;
35 };
36 #define ACPI_DEBUG_INIT(v) { .name = #v, .value = v }
37
38 static 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
55 static 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
param_get_debug_layer(char * buffer,const struct kernel_param * kp)92 static 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
param_get_debug_level(char * buffer,const struct kernel_param * kp)120 static 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
141 static const struct kernel_param_ops param_ops_debug_layer = {
142 .set = param_set_uint,
143 .get = param_get_debug_layer,
144 };
145
146 static const struct kernel_param_ops param_ops_debug_level = {
147 .set = param_set_uint,
148 .get = param_get_debug_level,
149 };
150
151 module_param_cb(debug_layer, ¶m_ops_debug_layer, &acpi_dbg_layer, 0644);
152 module_param_cb(debug_level, ¶m_ops_debug_level, &acpi_dbg_level, 0644);
153
154 static char trace_method_name[1024];
155
param_set_trace_method_name(const char * val,const struct kernel_param * kp)156 static 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
param_get_trace_method_name(char * buffer,const struct kernel_param * kp)199 static 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
204 static 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
209 static const struct kernel_param_ops param_ops_trace_attrib = {
210 .set = param_set_uint,
211 .get = param_get_uint,
212 };
213
214 module_param_cb(trace_method_name, ¶m_ops_trace_method, &trace_method_name, 0644);
215 module_param_cb(trace_debug_layer, ¶m_ops_trace_attrib, &acpi_gbl_trace_dbg_layer, 0644);
216 module_param_cb(trace_debug_level, ¶m_ops_trace_attrib, &acpi_gbl_trace_dbg_level, 0644);
217
param_set_trace_state(const char * val,const struct kernel_param * kp)218 static 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
param_get_trace_state(char * buffer,const struct kernel_param * kp)255 static 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
267 module_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
274 module_param_named(aml_debug_output, acpi_gbl_enable_aml_debug_object,
275 byte, 0644);
276 MODULE_PARM_DESC(aml_debug_output,
277 "To enable/disable the ACPI Debug Object output.");
278
279 /* /sys/module/acpi/parameters/acpica_version */
param_get_acpica_version(char * buffer,const struct kernel_param * kp)280 static 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
290 module_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
299 static LIST_HEAD(acpi_table_attr_list);
300 static struct kobject *tables_kobj;
301 static struct kobject *tables_data_kobj;
302 static struct kobject *dynamic_tables_kobj;
303 static struct kobject *hotplug_kobj;
304
305 #define ACPI_MAX_TABLE_INSTANCES 999
306 #define ACPI_INST_SIZE 4 /* including trailing 0 */
307
308 struct 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
316 struct acpi_data_attr {
317 struct bin_attribute attr;
318 u64 addr;
319 };
320
acpi_table_show(struct file * filp,struct kobject * kobj,struct bin_attribute * bin_attr,char * buf,loff_t offset,size_t count)321 static ssize_t acpi_table_show(struct file *filp, struct kobject *kobj,
322 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(table_attr->name, table_attr->instance,
332 &table_header);
333 if (ACPI_FAILURE(status))
334 return -ENODEV;
335
336 rc = memory_read_from_buffer(buf, count, &offset, table_header,
337 table_header->length);
338 acpi_put_table(table_header);
339 return rc;
340 }
341
acpi_table_attr_init(struct kobject * tables_obj,struct acpi_table_attr * table_attr,struct acpi_table_header * table_header)342 static 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 (table_header->signature, 2, &header))) {
369 snprintf(instance_str, sizeof(instance_str), "%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(tables_obj, &table_attr->attr);
380 }
381
acpi_sysfs_table_handler(u32 event,void * table,void * context)382 acpi_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(dynamic_tables_kobj,
393 table_attr, table)) {
394 kfree(table_attr);
395 return AE_ERROR;
396 }
397 list_add_tail(&table_attr->node, &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
acpi_data_show(struct file * filp,struct kobject * kobj,struct bin_attribute * bin_attr,char * buf,loff_t offset,size_t count)414 static ssize_t acpi_data_show(struct file *filp, struct kobject *kobj,
415 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(data_attr->addr, size);
435 if (!base)
436 return -ENOMEM;
437
438 memcpy_fromio(buf, base + offset, count);
439
440 acpi_os_unmap_iomem(base, size);
441
442 return count;
443 }
444
acpi_bert_data_init(void * th,struct acpi_data_attr * data_attr)445 static 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(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(tables_data_kobj, &data_attr->attr);
459 }
460
461 static struct acpi_data_obj {
462 char *name;
463 int (*fn)(void *, struct acpi_data_attr *);
464 } acpi_data_objs[] = {
465 { ACPI_SIG_BERT, acpi_bert_data_init },
466 };
467
468 #define NUM_ACPI_DATA_OBJS ARRAY_SIZE(acpi_data_objs)
469
acpi_table_data_init(struct acpi_table_header * th)470 static int acpi_table_data_init(struct acpi_table_header *th)
471 {
472 struct acpi_data_attr *data_attr;
473 int i;
474
475 for (i = 0; i < NUM_ACPI_DATA_OBJS; i++) {
476 if (ACPI_COMPARE_NAMESEG(th->signature, acpi_data_objs[i].name)) {
477 data_attr = kzalloc(sizeof(*data_attr), GFP_KERNEL);
478 if (!data_attr)
479 return -ENOMEM;
480 sysfs_attr_init(&data_attr->attr.attr);
481 data_attr->attr.read = acpi_data_show;
482 data_attr->attr.attr.mode = 0400;
483 return acpi_data_objs[i].fn(th, data_attr);
484 }
485 }
486 return 0;
487 }
488
acpi_tables_sysfs_init(void)489 static int acpi_tables_sysfs_init(void)
490 {
491 struct acpi_table_attr *table_attr;
492 struct acpi_table_header *table_header = NULL;
493 int table_index;
494 acpi_status status;
495 int ret;
496
497 tables_kobj = kobject_create_and_add("tables", acpi_kobj);
498 if (!tables_kobj)
499 goto err;
500
501 tables_data_kobj = kobject_create_and_add("data", tables_kobj);
502 if (!tables_data_kobj)
503 goto err_tables_data;
504
505 dynamic_tables_kobj = kobject_create_and_add("dynamic", tables_kobj);
506 if (!dynamic_tables_kobj)
507 goto err_dynamic_tables;
508
509 for (table_index = 0;; table_index++) {
510 status = acpi_get_table_by_index(table_index, &table_header);
511
512 if (status == AE_BAD_PARAMETER)
513 break;
514
515 if (ACPI_FAILURE(status))
516 continue;
517
518 table_attr = kzalloc(sizeof(*table_attr), GFP_KERNEL);
519 if (!table_attr)
520 return -ENOMEM;
521
522 ret = acpi_table_attr_init(tables_kobj,
523 table_attr, table_header);
524 if (ret) {
525 kfree(table_attr);
526 return ret;
527 }
528 list_add_tail(&table_attr->node, &acpi_table_attr_list);
529 acpi_table_data_init(table_header);
530 }
531
532 kobject_uevent(tables_kobj, KOBJ_ADD);
533 kobject_uevent(tables_data_kobj, KOBJ_ADD);
534 kobject_uevent(dynamic_tables_kobj, KOBJ_ADD);
535
536 return 0;
537 err_dynamic_tables:
538 kobject_put(tables_data_kobj);
539 err_tables_data:
540 kobject_put(tables_kobj);
541 err:
542 return -ENOMEM;
543 }
544
545 /*
546 * Detailed ACPI IRQ counters:
547 * /sys/firmware/acpi/interrupts/
548 */
549
550 u32 acpi_irq_handled;
551 u32 acpi_irq_not_handled;
552
553 #define COUNT_GPE 0
554 #define COUNT_SCI 1 /* acpi_irq_handled */
555 #define COUNT_SCI_NOT 2 /* acpi_irq_not_handled */
556 #define COUNT_ERROR 3 /* other */
557 #define NUM_COUNTERS_EXTRA 4
558
559 struct event_counter {
560 u32 count;
561 u32 flags;
562 };
563
564 static struct event_counter *all_counters;
565 static u32 num_gpes;
566 static u32 num_counters;
567 static struct attribute **all_attrs;
568 static u32 acpi_gpe_count;
569
570 static struct attribute_group interrupt_stats_attr_group = {
571 .name = "interrupts",
572 };
573
574 static struct kobj_attribute *counter_attrs;
575
delete_gpe_attr_array(void)576 static void delete_gpe_attr_array(void)
577 {
578 struct event_counter *tmp = all_counters;
579
580 all_counters = NULL;
581 kfree(tmp);
582
583 if (counter_attrs) {
584 int i;
585
586 for (i = 0; i < num_gpes; i++)
587 kfree(counter_attrs[i].attr.name);
588
589 kfree(counter_attrs);
590 }
591 kfree(all_attrs);
592 }
593
gpe_count(u32 gpe_number)594 static void gpe_count(u32 gpe_number)
595 {
596 acpi_gpe_count++;
597
598 if (!all_counters)
599 return;
600
601 if (gpe_number < num_gpes)
602 all_counters[gpe_number].count++;
603 else
604 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS +
605 COUNT_ERROR].count++;
606 }
607
fixed_event_count(u32 event_number)608 static void fixed_event_count(u32 event_number)
609 {
610 if (!all_counters)
611 return;
612
613 if (event_number < ACPI_NUM_FIXED_EVENTS)
614 all_counters[num_gpes + event_number].count++;
615 else
616 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS +
617 COUNT_ERROR].count++;
618 }
619
acpi_global_event_handler(u32 event_type,acpi_handle device,u32 event_number,void * context)620 static void acpi_global_event_handler(u32 event_type, acpi_handle device,
621 u32 event_number, void *context)
622 {
623 if (event_type == ACPI_EVENT_TYPE_GPE) {
624 gpe_count(event_number);
625 pr_debug("GPE event 0x%02x\n", event_number);
626 } else if (event_type == ACPI_EVENT_TYPE_FIXED) {
627 fixed_event_count(event_number);
628 pr_debug("Fixed event 0x%02x\n", event_number);
629 } else {
630 pr_debug("Other event 0x%02x\n", event_number);
631 }
632 }
633
get_status(u32 index,acpi_event_status * ret,acpi_handle * handle)634 static int get_status(u32 index, acpi_event_status *ret,
635 acpi_handle *handle)
636 {
637 acpi_status status;
638
639 if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
640 return -EINVAL;
641
642 if (index < num_gpes) {
643 status = acpi_get_gpe_device(index, handle);
644 if (ACPI_FAILURE(status)) {
645 pr_warn("Invalid GPE 0x%x", index);
646 return -ENXIO;
647 }
648 status = acpi_get_gpe_status(*handle, index, ret);
649 } else {
650 status = acpi_get_event_status(index - num_gpes, ret);
651 }
652 if (ACPI_FAILURE(status))
653 return -EIO;
654
655 return 0;
656 }
657
counter_show(struct kobject * kobj,struct kobj_attribute * attr,char * buf)658 static ssize_t counter_show(struct kobject *kobj,
659 struct kobj_attribute *attr, char *buf)
660 {
661 int index = attr - counter_attrs;
662 int size;
663 acpi_handle handle;
664 acpi_event_status status;
665 int result = 0;
666
667 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI].count =
668 acpi_irq_handled;
669 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT].count =
670 acpi_irq_not_handled;
671 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE].count =
672 acpi_gpe_count;
673 size = sprintf(buf, "%8u", all_counters[index].count);
674
675 /* "gpe_all" or "sci" */
676 if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
677 goto end;
678
679 result = get_status(index, &status, &handle);
680 if (result)
681 goto end;
682
683 if (status & ACPI_EVENT_FLAG_ENABLE_SET)
684 size += sprintf(buf + size, " EN");
685 else
686 size += sprintf(buf + size, " ");
687 if (status & ACPI_EVENT_FLAG_STATUS_SET)
688 size += sprintf(buf + size, " STS");
689 else
690 size += sprintf(buf + size, " ");
691
692 if (!(status & ACPI_EVENT_FLAG_HAS_HANDLER))
693 size += sprintf(buf + size, " invalid ");
694 else if (status & ACPI_EVENT_FLAG_ENABLED)
695 size += sprintf(buf + size, " enabled ");
696 else if (status & ACPI_EVENT_FLAG_WAKE_ENABLED)
697 size += sprintf(buf + size, " wake_enabled");
698 else
699 size += sprintf(buf + size, " disabled ");
700 if (status & ACPI_EVENT_FLAG_MASKED)
701 size += sprintf(buf + size, " masked ");
702 else
703 size += sprintf(buf + size, " unmasked");
704
705 end:
706 size += sprintf(buf + size, "\n");
707 return result ? result : size;
708 }
709
710 /*
711 * counter_set() sets the specified counter.
712 * setting the total "sci" file to any value clears all counters.
713 * enable/disable/clear a gpe/fixed event in user space.
714 */
counter_set(struct kobject * kobj,struct kobj_attribute * attr,const char * buf,size_t size)715 static ssize_t counter_set(struct kobject *kobj,
716 struct kobj_attribute *attr, const char *buf,
717 size_t size)
718 {
719 int index = attr - counter_attrs;
720 acpi_event_status status;
721 acpi_handle handle;
722 int result = 0;
723 unsigned long tmp;
724
725 if (index == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI) {
726 int i;
727 for (i = 0; i < num_counters; ++i)
728 all_counters[i].count = 0;
729 acpi_gpe_count = 0;
730 acpi_irq_handled = 0;
731 acpi_irq_not_handled = 0;
732 goto end;
733 }
734
735 /* show the event status for both GPEs and Fixed Events */
736 result = get_status(index, &status, &handle);
737 if (result)
738 goto end;
739
740 if (!(status & ACPI_EVENT_FLAG_HAS_HANDLER)) {
741 pr_warn("Can not change Invalid GPE/Fixed Event status\n");
742 return -EINVAL;
743 }
744
745 if (index < num_gpes) {
746 if (!strcmp(buf, "disable\n") &&
747 (status & ACPI_EVENT_FLAG_ENABLED))
748 result = acpi_disable_gpe(handle, index);
749 else if (!strcmp(buf, "enable\n") &&
750 !(status & ACPI_EVENT_FLAG_ENABLED))
751 result = acpi_enable_gpe(handle, index);
752 else if (!strcmp(buf, "clear\n") &&
753 (status & ACPI_EVENT_FLAG_STATUS_SET))
754 result = acpi_clear_gpe(handle, index);
755 else if (!strcmp(buf, "mask\n"))
756 result = acpi_mask_gpe(handle, index, TRUE);
757 else if (!strcmp(buf, "unmask\n"))
758 result = acpi_mask_gpe(handle, index, FALSE);
759 else if (!kstrtoul(buf, 0, &tmp))
760 all_counters[index].count = tmp;
761 else
762 result = -EINVAL;
763 } else if (index < num_gpes + ACPI_NUM_FIXED_EVENTS) {
764 int event = index - num_gpes;
765 if (!strcmp(buf, "disable\n") &&
766 (status & ACPI_EVENT_FLAG_ENABLE_SET))
767 result = acpi_disable_event(event, ACPI_NOT_ISR);
768 else if (!strcmp(buf, "enable\n") &&
769 !(status & ACPI_EVENT_FLAG_ENABLE_SET))
770 result = acpi_enable_event(event, ACPI_NOT_ISR);
771 else if (!strcmp(buf, "clear\n") &&
772 (status & ACPI_EVENT_FLAG_STATUS_SET))
773 result = acpi_clear_event(event);
774 else if (!kstrtoul(buf, 0, &tmp))
775 all_counters[index].count = tmp;
776 else
777 result = -EINVAL;
778 } else
779 all_counters[index].count = strtoul(buf, NULL, 0);
780
781 if (ACPI_FAILURE(result))
782 result = -EINVAL;
783 end:
784 return result ? result : size;
785 }
786
787 /*
788 * A Quirk Mechanism for GPE Flooding Prevention:
789 *
790 * Quirks may be needed to prevent GPE flooding on a specific GPE. The
791 * flooding typically cannot be detected and automatically prevented by
792 * ACPI_GPE_DISPATCH_NONE check because there is a _Lxx/_Exx prepared in
793 * the AML tables. This normally indicates a feature gap in Linux, thus
794 * instead of providing endless quirk tables, we provide a boot parameter
795 * for those who want this quirk. For example, if the users want to prevent
796 * the GPE flooding for GPE 00, they need to specify the following boot
797 * parameter:
798 * acpi_mask_gpe=0x00
799 * Note, the parameter can be a list (see bitmap_parselist() for the details).
800 * The masking status can be modified by the following runtime controlling
801 * interface:
802 * echo unmask > /sys/firmware/acpi/interrupts/gpe00
803 */
804 #define ACPI_MASKABLE_GPE_MAX 0x100
805 static DECLARE_BITMAP(acpi_masked_gpes_map, ACPI_MASKABLE_GPE_MAX) __initdata;
806
acpi_gpe_set_masked_gpes(char * val)807 static int __init acpi_gpe_set_masked_gpes(char *val)
808 {
809 int ret;
810 u8 gpe;
811
812 ret = kstrtou8(val, 0, &gpe);
813 if (ret) {
814 ret = bitmap_parselist(val, acpi_masked_gpes_map, ACPI_MASKABLE_GPE_MAX);
815 if (ret)
816 return ret;
817 } else
818 set_bit(gpe, acpi_masked_gpes_map);
819
820 return 1;
821 }
822 __setup("acpi_mask_gpe=", acpi_gpe_set_masked_gpes);
823
acpi_gpe_apply_masked_gpes(void)824 void __init acpi_gpe_apply_masked_gpes(void)
825 {
826 acpi_handle handle;
827 acpi_status status;
828 u16 gpe;
829
830 for_each_set_bit(gpe, acpi_masked_gpes_map, ACPI_MASKABLE_GPE_MAX) {
831 status = acpi_get_gpe_device(gpe, &handle);
832 if (ACPI_SUCCESS(status)) {
833 pr_info("Masking GPE 0x%x.\n", gpe);
834 (void)acpi_mask_gpe(handle, gpe, TRUE);
835 }
836 }
837 }
838
acpi_irq_stats_init(void)839 void acpi_irq_stats_init(void)
840 {
841 acpi_status status;
842 int i;
843
844 if (all_counters)
845 return;
846
847 num_gpes = acpi_current_gpe_count;
848 num_counters = num_gpes + ACPI_NUM_FIXED_EVENTS + NUM_COUNTERS_EXTRA;
849
850 all_attrs = kcalloc(num_counters + 1, sizeof(*all_attrs), GFP_KERNEL);
851 if (all_attrs == NULL)
852 return;
853
854 all_counters = kcalloc(num_counters, sizeof(*all_counters), GFP_KERNEL);
855 if (all_counters == NULL)
856 goto fail;
857
858 status = acpi_install_global_event_handler(acpi_global_event_handler, NULL);
859 if (ACPI_FAILURE(status))
860 goto fail;
861
862 counter_attrs = kcalloc(num_counters, sizeof(*counter_attrs), GFP_KERNEL);
863 if (counter_attrs == NULL)
864 goto fail;
865
866 for (i = 0; i < num_counters; ++i) {
867 char buffer[12];
868 char *name;
869
870 if (i < num_gpes)
871 sprintf(buffer, "gpe%02X", i);
872 else if (i == num_gpes + ACPI_EVENT_PMTIMER)
873 sprintf(buffer, "ff_pmtimer");
874 else if (i == num_gpes + ACPI_EVENT_GLOBAL)
875 sprintf(buffer, "ff_gbl_lock");
876 else if (i == num_gpes + ACPI_EVENT_POWER_BUTTON)
877 sprintf(buffer, "ff_pwr_btn");
878 else if (i == num_gpes + ACPI_EVENT_SLEEP_BUTTON)
879 sprintf(buffer, "ff_slp_btn");
880 else if (i == num_gpes + ACPI_EVENT_RTC)
881 sprintf(buffer, "ff_rt_clk");
882 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE)
883 sprintf(buffer, "gpe_all");
884 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI)
885 sprintf(buffer, "sci");
886 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT)
887 sprintf(buffer, "sci_not");
888 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR)
889 sprintf(buffer, "error");
890 else
891 sprintf(buffer, "bug%02X", i);
892
893 name = kstrdup(buffer, GFP_KERNEL);
894 if (name == NULL)
895 goto fail;
896
897 sysfs_attr_init(&counter_attrs[i].attr);
898 counter_attrs[i].attr.name = name;
899 counter_attrs[i].attr.mode = 0644;
900 counter_attrs[i].show = counter_show;
901 counter_attrs[i].store = counter_set;
902
903 all_attrs[i] = &counter_attrs[i].attr;
904 }
905
906 interrupt_stats_attr_group.attrs = all_attrs;
907 if (!sysfs_create_group(acpi_kobj, &interrupt_stats_attr_group))
908 return;
909
910 fail:
911 delete_gpe_attr_array();
912 }
913
interrupt_stats_exit(void)914 static void __exit interrupt_stats_exit(void)
915 {
916 sysfs_remove_group(acpi_kobj, &interrupt_stats_attr_group);
917
918 delete_gpe_attr_array();
919 }
920
pm_profile_show(struct kobject * kobj,struct kobj_attribute * attr,char * buf)921 static ssize_t pm_profile_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
922 {
923 return sprintf(buf, "%d\n", acpi_gbl_FADT.preferred_profile);
924 }
925
926 static const struct kobj_attribute pm_profile_attr = __ATTR_RO(pm_profile);
927
enabled_show(struct kobject * kobj,struct kobj_attribute * attr,char * buf)928 static ssize_t enabled_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
929 {
930 struct acpi_hotplug_profile *hotplug = to_acpi_hotplug_profile(kobj);
931
932 return sprintf(buf, "%d\n", hotplug->enabled);
933 }
934
enabled_store(struct kobject * kobj,struct kobj_attribute * attr,const char * buf,size_t size)935 static ssize_t enabled_store(struct kobject *kobj, struct kobj_attribute *attr,
936 const char *buf, size_t size)
937 {
938 struct acpi_hotplug_profile *hotplug = to_acpi_hotplug_profile(kobj);
939 unsigned int val;
940
941 if (kstrtouint(buf, 10, &val) || val > 1)
942 return -EINVAL;
943
944 acpi_scan_hotplug_enabled(hotplug, val);
945 return size;
946 }
947
948 static struct kobj_attribute hotplug_enabled_attr = __ATTR_RW(enabled);
949
950 static struct attribute *hotplug_profile_attrs[] = {
951 &hotplug_enabled_attr.attr,
952 NULL
953 };
954 ATTRIBUTE_GROUPS(hotplug_profile);
955
956 static const struct kobj_type acpi_hotplug_profile_ktype = {
957 .sysfs_ops = &kobj_sysfs_ops,
958 .default_groups = hotplug_profile_groups,
959 };
960
acpi_sysfs_add_hotplug_profile(struct acpi_hotplug_profile * hotplug,const char * name)961 void acpi_sysfs_add_hotplug_profile(struct acpi_hotplug_profile *hotplug,
962 const char *name)
963 {
964 int error;
965
966 if (!hotplug_kobj)
967 goto err_out;
968
969 error = kobject_init_and_add(&hotplug->kobj,
970 &acpi_hotplug_profile_ktype, hotplug_kobj, "%s", name);
971 if (error) {
972 kobject_put(&hotplug->kobj);
973 goto err_out;
974 }
975
976 kobject_uevent(&hotplug->kobj, KOBJ_ADD);
977 return;
978
979 err_out:
980 pr_err("Unable to add hotplug profile '%s'\n", name);
981 }
982
force_remove_show(struct kobject * kobj,struct kobj_attribute * attr,char * buf)983 static ssize_t force_remove_show(struct kobject *kobj,
984 struct kobj_attribute *attr, char *buf)
985 {
986 return sprintf(buf, "%d\n", 0);
987 }
988
force_remove_store(struct kobject * kobj,struct kobj_attribute * attr,const char * buf,size_t size)989 static ssize_t force_remove_store(struct kobject *kobj,
990 struct kobj_attribute *attr,
991 const char *buf, size_t size)
992 {
993 bool val;
994 int ret;
995
996 ret = kstrtobool(buf, &val);
997 if (ret < 0)
998 return ret;
999
1000 if (val) {
1001 pr_err("Enabling force_remove is not supported anymore. Please report to linux-acpi@vger.kernel.org if you depend on this functionality\n");
1002 return -EINVAL;
1003 }
1004 return size;
1005 }
1006
1007 static const struct kobj_attribute force_remove_attr = __ATTR_RW(force_remove);
1008
acpi_sysfs_init(void)1009 int __init acpi_sysfs_init(void)
1010 {
1011 int result;
1012
1013 result = acpi_tables_sysfs_init();
1014 if (result)
1015 return result;
1016
1017 hotplug_kobj = kobject_create_and_add("hotplug", acpi_kobj);
1018 if (!hotplug_kobj)
1019 return -ENOMEM;
1020
1021 result = sysfs_create_file(hotplug_kobj, &force_remove_attr.attr);
1022 if (result)
1023 return result;
1024
1025 result = sysfs_create_file(acpi_kobj, &pm_profile_attr.attr);
1026 return result;
1027 }
1028