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