1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * sysfs.c - ACPI sysfs interface to userspace.
4 */
5
6 #define pr_fmt(fmt) "ACPI: " fmt
7
8 #include <linux/init.h>
9 #include <linux/kernel.h>
10 #include <linux/moduleparam.h>
11 #include <linux/acpi.h>
12
13 #include "internal.h"
14
15 #define _COMPONENT ACPI_SYSTEM_COMPONENT
16 ACPI_MODULE_NAME("sysfs");
17
18 #ifdef CONFIG_ACPI_DEBUG
19 /*
20 * ACPI debug sysfs I/F, including:
21 * /sys/modules/acpi/parameters/debug_layer
22 * /sys/modules/acpi/parameters/debug_level
23 * /sys/modules/acpi/parameters/trace_method_name
24 * /sys/modules/acpi/parameters/trace_state
25 * /sys/modules/acpi/parameters/trace_debug_layer
26 * /sys/modules/acpi/parameters/trace_debug_level
27 */
28
29 struct acpi_dlayer {
30 const char *name;
31 unsigned long value;
32 };
33 struct acpi_dlevel {
34 const char *name;
35 unsigned long value;
36 };
37 #define ACPI_DEBUG_INIT(v) { .name = #v, .value = v }
38
39 static const struct acpi_dlayer acpi_debug_layers[] = {
40 ACPI_DEBUG_INIT(ACPI_UTILITIES),
41 ACPI_DEBUG_INIT(ACPI_HARDWARE),
42 ACPI_DEBUG_INIT(ACPI_EVENTS),
43 ACPI_DEBUG_INIT(ACPI_TABLES),
44 ACPI_DEBUG_INIT(ACPI_NAMESPACE),
45 ACPI_DEBUG_INIT(ACPI_PARSER),
46 ACPI_DEBUG_INIT(ACPI_DISPATCHER),
47 ACPI_DEBUG_INIT(ACPI_EXECUTER),
48 ACPI_DEBUG_INIT(ACPI_RESOURCES),
49 ACPI_DEBUG_INIT(ACPI_CA_DEBUGGER),
50 ACPI_DEBUG_INIT(ACPI_OS_SERVICES),
51 ACPI_DEBUG_INIT(ACPI_CA_DISASSEMBLER),
52 ACPI_DEBUG_INIT(ACPI_COMPILER),
53 ACPI_DEBUG_INIT(ACPI_TOOLS),
54
55 ACPI_DEBUG_INIT(ACPI_BUS_COMPONENT),
56 ACPI_DEBUG_INIT(ACPI_AC_COMPONENT),
57 ACPI_DEBUG_INIT(ACPI_BATTERY_COMPONENT),
58 ACPI_DEBUG_INIT(ACPI_BUTTON_COMPONENT),
59 ACPI_DEBUG_INIT(ACPI_SBS_COMPONENT),
60 ACPI_DEBUG_INIT(ACPI_FAN_COMPONENT),
61 ACPI_DEBUG_INIT(ACPI_PCI_COMPONENT),
62 ACPI_DEBUG_INIT(ACPI_POWER_COMPONENT),
63 ACPI_DEBUG_INIT(ACPI_CONTAINER_COMPONENT),
64 ACPI_DEBUG_INIT(ACPI_SYSTEM_COMPONENT),
65 ACPI_DEBUG_INIT(ACPI_THERMAL_COMPONENT),
66 ACPI_DEBUG_INIT(ACPI_MEMORY_DEVICE_COMPONENT),
67 ACPI_DEBUG_INIT(ACPI_VIDEO_COMPONENT),
68 ACPI_DEBUG_INIT(ACPI_PROCESSOR_COMPONENT),
69 };
70
71 static const struct acpi_dlevel acpi_debug_levels[] = {
72 ACPI_DEBUG_INIT(ACPI_LV_INIT),
73 ACPI_DEBUG_INIT(ACPI_LV_DEBUG_OBJECT),
74 ACPI_DEBUG_INIT(ACPI_LV_INFO),
75 ACPI_DEBUG_INIT(ACPI_LV_REPAIR),
76 ACPI_DEBUG_INIT(ACPI_LV_TRACE_POINT),
77
78 ACPI_DEBUG_INIT(ACPI_LV_INIT_NAMES),
79 ACPI_DEBUG_INIT(ACPI_LV_PARSE),
80 ACPI_DEBUG_INIT(ACPI_LV_LOAD),
81 ACPI_DEBUG_INIT(ACPI_LV_DISPATCH),
82 ACPI_DEBUG_INIT(ACPI_LV_EXEC),
83 ACPI_DEBUG_INIT(ACPI_LV_NAMES),
84 ACPI_DEBUG_INIT(ACPI_LV_OPREGION),
85 ACPI_DEBUG_INIT(ACPI_LV_BFIELD),
86 ACPI_DEBUG_INIT(ACPI_LV_TABLES),
87 ACPI_DEBUG_INIT(ACPI_LV_VALUES),
88 ACPI_DEBUG_INIT(ACPI_LV_OBJECTS),
89 ACPI_DEBUG_INIT(ACPI_LV_RESOURCES),
90 ACPI_DEBUG_INIT(ACPI_LV_USER_REQUESTS),
91 ACPI_DEBUG_INIT(ACPI_LV_PACKAGE),
92
93 ACPI_DEBUG_INIT(ACPI_LV_ALLOCATIONS),
94 ACPI_DEBUG_INIT(ACPI_LV_FUNCTIONS),
95 ACPI_DEBUG_INIT(ACPI_LV_OPTIMIZATIONS),
96
97 ACPI_DEBUG_INIT(ACPI_LV_MUTEX),
98 ACPI_DEBUG_INIT(ACPI_LV_THREADS),
99 ACPI_DEBUG_INIT(ACPI_LV_IO),
100 ACPI_DEBUG_INIT(ACPI_LV_INTERRUPTS),
101
102 ACPI_DEBUG_INIT(ACPI_LV_AML_DISASSEMBLE),
103 ACPI_DEBUG_INIT(ACPI_LV_VERBOSE_INFO),
104 ACPI_DEBUG_INIT(ACPI_LV_FULL_TABLES),
105 ACPI_DEBUG_INIT(ACPI_LV_EVENTS),
106 };
107
param_get_debug_layer(char * buffer,const struct kernel_param * kp)108 static int param_get_debug_layer(char *buffer, const struct kernel_param *kp)
109 {
110 int result = 0;
111 int i;
112
113 result = sprintf(buffer, "%-25s\tHex SET\n", "Description");
114
115 for (i = 0; i < ARRAY_SIZE(acpi_debug_layers); i++) {
116 result += sprintf(buffer + result, "%-25s\t0x%08lX [%c]\n",
117 acpi_debug_layers[i].name,
118 acpi_debug_layers[i].value,
119 (acpi_dbg_layer & acpi_debug_layers[i].value)
120 ? '*' : ' ');
121 }
122 result +=
123 sprintf(buffer + result, "%-25s\t0x%08X [%c]\n", "ACPI_ALL_DRIVERS",
124 ACPI_ALL_DRIVERS,
125 (acpi_dbg_layer & ACPI_ALL_DRIVERS) ==
126 ACPI_ALL_DRIVERS ? '*' : (acpi_dbg_layer & ACPI_ALL_DRIVERS)
127 == 0 ? ' ' : '-');
128 result +=
129 sprintf(buffer + result,
130 "--\ndebug_layer = 0x%08X ( * = enabled)\n",
131 acpi_dbg_layer);
132
133 return result;
134 }
135
param_get_debug_level(char * buffer,const struct kernel_param * kp)136 static int param_get_debug_level(char *buffer, const struct kernel_param *kp)
137 {
138 int result = 0;
139 int i;
140
141 result = sprintf(buffer, "%-25s\tHex SET\n", "Description");
142
143 for (i = 0; i < ARRAY_SIZE(acpi_debug_levels); i++) {
144 result += sprintf(buffer + result, "%-25s\t0x%08lX [%c]\n",
145 acpi_debug_levels[i].name,
146 acpi_debug_levels[i].value,
147 (acpi_dbg_level & acpi_debug_levels[i].value)
148 ? '*' : ' ');
149 }
150 result +=
151 sprintf(buffer + result, "--\ndebug_level = 0x%08X (* = enabled)\n",
152 acpi_dbg_level);
153
154 return result;
155 }
156
157 static const struct kernel_param_ops param_ops_debug_layer = {
158 .set = param_set_uint,
159 .get = param_get_debug_layer,
160 };
161
162 static const struct kernel_param_ops param_ops_debug_level = {
163 .set = param_set_uint,
164 .get = param_get_debug_level,
165 };
166
167 module_param_cb(debug_layer, ¶m_ops_debug_layer, &acpi_dbg_layer, 0644);
168 module_param_cb(debug_level, ¶m_ops_debug_level, &acpi_dbg_level, 0644);
169
170 static char trace_method_name[1024];
171
param_set_trace_method_name(const char * val,const struct kernel_param * kp)172 static int param_set_trace_method_name(const char *val,
173 const struct kernel_param *kp)
174 {
175 u32 saved_flags = 0;
176 bool is_abs_path = true;
177
178 if (*val != '\\')
179 is_abs_path = false;
180
181 if ((is_abs_path && strlen(val) > 1023) ||
182 (!is_abs_path && strlen(val) > 1022)) {
183 pr_err("%s: string parameter too long\n", kp->name);
184 return -ENOSPC;
185 }
186
187 /*
188 * It's not safe to update acpi_gbl_trace_method_name without
189 * having the tracer stopped, so we save the original tracer
190 * state and disable it.
191 */
192 saved_flags = acpi_gbl_trace_flags;
193 (void)acpi_debug_trace(NULL,
194 acpi_gbl_trace_dbg_level,
195 acpi_gbl_trace_dbg_layer,
196 0);
197
198 /* This is a hack. We can't kmalloc in early boot. */
199 if (is_abs_path)
200 strcpy(trace_method_name, val);
201 else {
202 trace_method_name[0] = '\\';
203 strcpy(trace_method_name+1, val);
204 }
205
206 /* Restore the original tracer state */
207 (void)acpi_debug_trace(trace_method_name,
208 acpi_gbl_trace_dbg_level,
209 acpi_gbl_trace_dbg_layer,
210 saved_flags);
211
212 return 0;
213 }
214
param_get_trace_method_name(char * buffer,const struct kernel_param * kp)215 static int param_get_trace_method_name(char *buffer, const struct kernel_param *kp)
216 {
217 return scnprintf(buffer, PAGE_SIZE, "%s\n", acpi_gbl_trace_method_name);
218 }
219
220 static const struct kernel_param_ops param_ops_trace_method = {
221 .set = param_set_trace_method_name,
222 .get = param_get_trace_method_name,
223 };
224
225 static const struct kernel_param_ops param_ops_trace_attrib = {
226 .set = param_set_uint,
227 .get = param_get_uint,
228 };
229
230 module_param_cb(trace_method_name, ¶m_ops_trace_method, &trace_method_name, 0644);
231 module_param_cb(trace_debug_layer, ¶m_ops_trace_attrib, &acpi_gbl_trace_dbg_layer, 0644);
232 module_param_cb(trace_debug_level, ¶m_ops_trace_attrib, &acpi_gbl_trace_dbg_level, 0644);
233
param_set_trace_state(const char * val,const struct kernel_param * kp)234 static int param_set_trace_state(const char *val,
235 const struct kernel_param *kp)
236 {
237 acpi_status status;
238 const char *method = trace_method_name;
239 u32 flags = 0;
240
241 /* So "xxx-once" comparison should go prior than "xxx" comparison */
242 #define acpi_compare_param(val, key) \
243 strncmp((val), (key), sizeof(key) - 1)
244
245 if (!acpi_compare_param(val, "enable")) {
246 method = NULL;
247 flags = ACPI_TRACE_ENABLED;
248 } else if (!acpi_compare_param(val, "disable"))
249 method = NULL;
250 else if (!acpi_compare_param(val, "method-once"))
251 flags = ACPI_TRACE_ENABLED | ACPI_TRACE_ONESHOT;
252 else if (!acpi_compare_param(val, "method"))
253 flags = ACPI_TRACE_ENABLED;
254 else if (!acpi_compare_param(val, "opcode-once"))
255 flags = ACPI_TRACE_ENABLED | ACPI_TRACE_ONESHOT | ACPI_TRACE_OPCODE;
256 else if (!acpi_compare_param(val, "opcode"))
257 flags = ACPI_TRACE_ENABLED | ACPI_TRACE_OPCODE;
258 else
259 return -EINVAL;
260
261 status = acpi_debug_trace(method,
262 acpi_gbl_trace_dbg_level,
263 acpi_gbl_trace_dbg_layer,
264 flags);
265 if (ACPI_FAILURE(status))
266 return -EBUSY;
267
268 return 0;
269 }
270
param_get_trace_state(char * buffer,const struct kernel_param * kp)271 static int param_get_trace_state(char *buffer, const struct kernel_param *kp)
272 {
273 if (!(acpi_gbl_trace_flags & ACPI_TRACE_ENABLED))
274 return sprintf(buffer, "disable\n");
275 else {
276 if (acpi_gbl_trace_method_name) {
277 if (acpi_gbl_trace_flags & ACPI_TRACE_ONESHOT)
278 return sprintf(buffer, "method-once\n");
279 else
280 return sprintf(buffer, "method\n");
281 } else
282 return sprintf(buffer, "enable\n");
283 }
284 return 0;
285 }
286
287 module_param_call(trace_state, param_set_trace_state, param_get_trace_state,
288 NULL, 0644);
289 #endif /* CONFIG_ACPI_DEBUG */
290
291
292 /* /sys/modules/acpi/parameters/aml_debug_output */
293
294 module_param_named(aml_debug_output, acpi_gbl_enable_aml_debug_object,
295 byte, 0644);
296 MODULE_PARM_DESC(aml_debug_output,
297 "To enable/disable the ACPI Debug Object output.");
298
299 /* /sys/module/acpi/parameters/acpica_version */
param_get_acpica_version(char * buffer,const struct kernel_param * kp)300 static int param_get_acpica_version(char *buffer,
301 const struct kernel_param *kp)
302 {
303 int result;
304
305 result = sprintf(buffer, "%x\n", ACPI_CA_VERSION);
306
307 return result;
308 }
309
310 module_param_call(acpica_version, NULL, param_get_acpica_version, NULL, 0444);
311
312 /*
313 * ACPI table sysfs I/F:
314 * /sys/firmware/acpi/tables/
315 * /sys/firmware/acpi/tables/data/
316 * /sys/firmware/acpi/tables/dynamic/
317 */
318
319 static LIST_HEAD(acpi_table_attr_list);
320 static struct kobject *tables_kobj;
321 static struct kobject *tables_data_kobj;
322 static struct kobject *dynamic_tables_kobj;
323 static struct kobject *hotplug_kobj;
324
325 #define ACPI_MAX_TABLE_INSTANCES 999
326 #define ACPI_INST_SIZE 4 /* including trailing 0 */
327
328 struct acpi_table_attr {
329 struct bin_attribute attr;
330 char name[ACPI_NAMESEG_SIZE];
331 int instance;
332 char filename[ACPI_NAMESEG_SIZE+ACPI_INST_SIZE];
333 struct list_head node;
334 };
335
336 struct acpi_data_attr {
337 struct bin_attribute attr;
338 u64 addr;
339 };
340
acpi_table_show(struct file * filp,struct kobject * kobj,struct bin_attribute * bin_attr,char * buf,loff_t offset,size_t count)341 static ssize_t acpi_table_show(struct file *filp, struct kobject *kobj,
342 struct bin_attribute *bin_attr, char *buf,
343 loff_t offset, size_t count)
344 {
345 struct acpi_table_attr *table_attr =
346 container_of(bin_attr, struct acpi_table_attr, attr);
347 struct acpi_table_header *table_header = NULL;
348 acpi_status status;
349 ssize_t rc;
350
351 status = acpi_get_table(table_attr->name, table_attr->instance,
352 &table_header);
353 if (ACPI_FAILURE(status))
354 return -ENODEV;
355
356 rc = memory_read_from_buffer(buf, count, &offset, table_header,
357 table_header->length);
358 acpi_put_table(table_header);
359 return rc;
360 }
361
acpi_table_attr_init(struct kobject * tables_obj,struct acpi_table_attr * table_attr,struct acpi_table_header * table_header)362 static int acpi_table_attr_init(struct kobject *tables_obj,
363 struct acpi_table_attr *table_attr,
364 struct acpi_table_header *table_header)
365 {
366 struct acpi_table_header *header = NULL;
367 struct acpi_table_attr *attr = NULL;
368 char instance_str[ACPI_INST_SIZE];
369
370 sysfs_attr_init(&table_attr->attr.attr);
371 ACPI_COPY_NAMESEG(table_attr->name, table_header->signature);
372
373 list_for_each_entry(attr, &acpi_table_attr_list, node) {
374 if (ACPI_COMPARE_NAMESEG(table_attr->name, attr->name))
375 if (table_attr->instance < attr->instance)
376 table_attr->instance = attr->instance;
377 }
378 table_attr->instance++;
379 if (table_attr->instance > ACPI_MAX_TABLE_INSTANCES) {
380 pr_warn("%4.4s: too many table instances\n",
381 table_attr->name);
382 return -ERANGE;
383 }
384
385 ACPI_COPY_NAMESEG(table_attr->filename, table_header->signature);
386 table_attr->filename[ACPI_NAMESEG_SIZE] = '\0';
387 if (table_attr->instance > 1 || (table_attr->instance == 1 &&
388 !acpi_get_table
389 (table_header->signature, 2, &header))) {
390 snprintf(instance_str, sizeof(instance_str), "%u",
391 table_attr->instance);
392 strcat(table_attr->filename, instance_str);
393 }
394
395 table_attr->attr.size = table_header->length;
396 table_attr->attr.read = acpi_table_show;
397 table_attr->attr.attr.name = table_attr->filename;
398 table_attr->attr.attr.mode = 0400;
399
400 return sysfs_create_bin_file(tables_obj, &table_attr->attr);
401 }
402
acpi_sysfs_table_handler(u32 event,void * table,void * context)403 acpi_status acpi_sysfs_table_handler(u32 event, void *table, void *context)
404 {
405 struct acpi_table_attr *table_attr;
406
407 switch (event) {
408 case ACPI_TABLE_EVENT_INSTALL:
409 table_attr =
410 kzalloc(sizeof(struct acpi_table_attr), GFP_KERNEL);
411 if (!table_attr)
412 return AE_NO_MEMORY;
413
414 if (acpi_table_attr_init(dynamic_tables_kobj,
415 table_attr, table)) {
416 kfree(table_attr);
417 return AE_ERROR;
418 }
419 list_add_tail(&table_attr->node, &acpi_table_attr_list);
420 break;
421 case ACPI_TABLE_EVENT_LOAD:
422 case ACPI_TABLE_EVENT_UNLOAD:
423 case ACPI_TABLE_EVENT_UNINSTALL:
424 /*
425 * we do not need to do anything right now
426 * because the table is not deleted from the
427 * global table list when unloading it.
428 */
429 break;
430 default:
431 return AE_BAD_PARAMETER;
432 }
433 return AE_OK;
434 }
435
acpi_data_show(struct file * filp,struct kobject * kobj,struct bin_attribute * bin_attr,char * buf,loff_t offset,size_t count)436 static ssize_t acpi_data_show(struct file *filp, struct kobject *kobj,
437 struct bin_attribute *bin_attr, char *buf,
438 loff_t offset, size_t count)
439 {
440 struct acpi_data_attr *data_attr;
441 void __iomem *base;
442 ssize_t size;
443
444 data_attr = container_of(bin_attr, struct acpi_data_attr, attr);
445 size = data_attr->attr.size;
446
447 if (offset < 0)
448 return -EINVAL;
449
450 if (offset >= size)
451 return 0;
452
453 if (count > size - offset)
454 count = size - offset;
455
456 base = acpi_os_map_iomem(data_attr->addr, size);
457 if (!base)
458 return -ENOMEM;
459
460 memcpy_fromio(buf, base + offset, count);
461
462 acpi_os_unmap_iomem(base, size);
463
464 return count;
465 }
466
acpi_bert_data_init(void * th,struct acpi_data_attr * data_attr)467 static int acpi_bert_data_init(void *th, struct acpi_data_attr *data_attr)
468 {
469 struct acpi_table_bert *bert = th;
470
471 if (bert->header.length < sizeof(struct acpi_table_bert) ||
472 bert->region_length < sizeof(struct acpi_hest_generic_status)) {
473 kfree(data_attr);
474 return -EINVAL;
475 }
476 data_attr->addr = bert->address;
477 data_attr->attr.size = bert->region_length;
478 data_attr->attr.attr.name = "BERT";
479
480 return sysfs_create_bin_file(tables_data_kobj, &data_attr->attr);
481 }
482
483 static struct acpi_data_obj {
484 char *name;
485 int (*fn)(void *, struct acpi_data_attr *);
486 } acpi_data_objs[] = {
487 { ACPI_SIG_BERT, acpi_bert_data_init },
488 };
489
490 #define NUM_ACPI_DATA_OBJS ARRAY_SIZE(acpi_data_objs)
491
acpi_table_data_init(struct acpi_table_header * th)492 static int acpi_table_data_init(struct acpi_table_header *th)
493 {
494 struct acpi_data_attr *data_attr;
495 int i;
496
497 for (i = 0; i < NUM_ACPI_DATA_OBJS; i++) {
498 if (ACPI_COMPARE_NAMESEG(th->signature, acpi_data_objs[i].name)) {
499 data_attr = kzalloc(sizeof(*data_attr), GFP_KERNEL);
500 if (!data_attr)
501 return -ENOMEM;
502 sysfs_attr_init(&data_attr->attr.attr);
503 data_attr->attr.read = acpi_data_show;
504 data_attr->attr.attr.mode = 0400;
505 return acpi_data_objs[i].fn(th, data_attr);
506 }
507 }
508 return 0;
509 }
510
acpi_tables_sysfs_init(void)511 static int acpi_tables_sysfs_init(void)
512 {
513 struct acpi_table_attr *table_attr;
514 struct acpi_table_header *table_header = NULL;
515 int table_index;
516 acpi_status status;
517 int ret;
518
519 tables_kobj = kobject_create_and_add("tables", acpi_kobj);
520 if (!tables_kobj)
521 goto err;
522
523 tables_data_kobj = kobject_create_and_add("data", tables_kobj);
524 if (!tables_data_kobj)
525 goto err_tables_data;
526
527 dynamic_tables_kobj = kobject_create_and_add("dynamic", tables_kobj);
528 if (!dynamic_tables_kobj)
529 goto err_dynamic_tables;
530
531 for (table_index = 0;; table_index++) {
532 status = acpi_get_table_by_index(table_index, &table_header);
533
534 if (status == AE_BAD_PARAMETER)
535 break;
536
537 if (ACPI_FAILURE(status))
538 continue;
539
540 table_attr = kzalloc(sizeof(*table_attr), GFP_KERNEL);
541 if (!table_attr)
542 return -ENOMEM;
543
544 ret = acpi_table_attr_init(tables_kobj,
545 table_attr, table_header);
546 if (ret) {
547 kfree(table_attr);
548 return ret;
549 }
550 list_add_tail(&table_attr->node, &acpi_table_attr_list);
551 acpi_table_data_init(table_header);
552 }
553
554 kobject_uevent(tables_kobj, KOBJ_ADD);
555 kobject_uevent(tables_data_kobj, KOBJ_ADD);
556 kobject_uevent(dynamic_tables_kobj, KOBJ_ADD);
557
558 return 0;
559 err_dynamic_tables:
560 kobject_put(tables_data_kobj);
561 err_tables_data:
562 kobject_put(tables_kobj);
563 err:
564 return -ENOMEM;
565 }
566
567 /*
568 * Detailed ACPI IRQ counters:
569 * /sys/firmware/acpi/interrupts/
570 */
571
572 u32 acpi_irq_handled;
573 u32 acpi_irq_not_handled;
574
575 #define COUNT_GPE 0
576 #define COUNT_SCI 1 /* acpi_irq_handled */
577 #define COUNT_SCI_NOT 2 /* acpi_irq_not_handled */
578 #define COUNT_ERROR 3 /* other */
579 #define NUM_COUNTERS_EXTRA 4
580
581 struct event_counter {
582 u32 count;
583 u32 flags;
584 };
585
586 static struct event_counter *all_counters;
587 static u32 num_gpes;
588 static u32 num_counters;
589 static struct attribute **all_attrs;
590 static u32 acpi_gpe_count;
591
592 static struct attribute_group interrupt_stats_attr_group = {
593 .name = "interrupts",
594 };
595
596 static struct kobj_attribute *counter_attrs;
597
delete_gpe_attr_array(void)598 static void delete_gpe_attr_array(void)
599 {
600 struct event_counter *tmp = all_counters;
601
602 all_counters = NULL;
603 kfree(tmp);
604
605 if (counter_attrs) {
606 int i;
607
608 for (i = 0; i < num_gpes; i++)
609 kfree(counter_attrs[i].attr.name);
610
611 kfree(counter_attrs);
612 }
613 kfree(all_attrs);
614
615 return;
616 }
617
gpe_count(u32 gpe_number)618 static void gpe_count(u32 gpe_number)
619 {
620 acpi_gpe_count++;
621
622 if (!all_counters)
623 return;
624
625 if (gpe_number < num_gpes)
626 all_counters[gpe_number].count++;
627 else
628 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS +
629 COUNT_ERROR].count++;
630
631 return;
632 }
633
fixed_event_count(u32 event_number)634 static void fixed_event_count(u32 event_number)
635 {
636 if (!all_counters)
637 return;
638
639 if (event_number < ACPI_NUM_FIXED_EVENTS)
640 all_counters[num_gpes + event_number].count++;
641 else
642 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS +
643 COUNT_ERROR].count++;
644
645 return;
646 }
647
acpi_global_event_handler(u32 event_type,acpi_handle device,u32 event_number,void * context)648 static void acpi_global_event_handler(u32 event_type, acpi_handle device,
649 u32 event_number, void *context)
650 {
651 if (event_type == ACPI_EVENT_TYPE_GPE) {
652 gpe_count(event_number);
653 pr_debug("GPE event 0x%02x\n", event_number);
654 } else if (event_type == ACPI_EVENT_TYPE_FIXED) {
655 fixed_event_count(event_number);
656 pr_debug("Fixed event 0x%02x\n", event_number);
657 } else {
658 pr_debug("Other event 0x%02x\n", event_number);
659 }
660 }
661
get_status(u32 index,acpi_event_status * ret,acpi_handle * handle)662 static int get_status(u32 index, acpi_event_status *ret,
663 acpi_handle *handle)
664 {
665 acpi_status status;
666
667 if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
668 return -EINVAL;
669
670 if (index < num_gpes) {
671 status = acpi_get_gpe_device(index, handle);
672 if (ACPI_FAILURE(status)) {
673 ACPI_EXCEPTION((AE_INFO, AE_NOT_FOUND,
674 "Invalid GPE 0x%x", index));
675 return -ENXIO;
676 }
677 status = acpi_get_gpe_status(*handle, index, ret);
678 } else {
679 status = acpi_get_event_status(index - num_gpes, ret);
680 }
681 if (ACPI_FAILURE(status))
682 return -EIO;
683
684 return 0;
685 }
686
counter_show(struct kobject * kobj,struct kobj_attribute * attr,char * buf)687 static ssize_t counter_show(struct kobject *kobj,
688 struct kobj_attribute *attr, char *buf)
689 {
690 int index = attr - counter_attrs;
691 int size;
692 acpi_handle handle;
693 acpi_event_status status;
694 int result = 0;
695
696 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI].count =
697 acpi_irq_handled;
698 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT].count =
699 acpi_irq_not_handled;
700 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE].count =
701 acpi_gpe_count;
702 size = sprintf(buf, "%8u", all_counters[index].count);
703
704 /* "gpe_all" or "sci" */
705 if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
706 goto end;
707
708 result = get_status(index, &status, &handle);
709 if (result)
710 goto end;
711
712 if (status & ACPI_EVENT_FLAG_ENABLE_SET)
713 size += sprintf(buf + size, " EN");
714 else
715 size += sprintf(buf + size, " ");
716 if (status & ACPI_EVENT_FLAG_STATUS_SET)
717 size += sprintf(buf + size, " STS");
718 else
719 size += sprintf(buf + size, " ");
720
721 if (!(status & ACPI_EVENT_FLAG_HAS_HANDLER))
722 size += sprintf(buf + size, " invalid ");
723 else if (status & ACPI_EVENT_FLAG_ENABLED)
724 size += sprintf(buf + size, " enabled ");
725 else if (status & ACPI_EVENT_FLAG_WAKE_ENABLED)
726 size += sprintf(buf + size, " wake_enabled");
727 else
728 size += sprintf(buf + size, " disabled ");
729 if (status & ACPI_EVENT_FLAG_MASKED)
730 size += sprintf(buf + size, " masked ");
731 else
732 size += sprintf(buf + size, " unmasked");
733
734 end:
735 size += sprintf(buf + size, "\n");
736 return result ? result : size;
737 }
738
739 /*
740 * counter_set() sets the specified counter.
741 * setting the total "sci" file to any value clears all counters.
742 * enable/disable/clear a gpe/fixed event in user space.
743 */
counter_set(struct kobject * kobj,struct kobj_attribute * attr,const char * buf,size_t size)744 static ssize_t counter_set(struct kobject *kobj,
745 struct kobj_attribute *attr, const char *buf,
746 size_t size)
747 {
748 int index = attr - counter_attrs;
749 acpi_event_status status;
750 acpi_handle handle;
751 int result = 0;
752 unsigned long tmp;
753
754 if (index == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI) {
755 int i;
756 for (i = 0; i < num_counters; ++i)
757 all_counters[i].count = 0;
758 acpi_gpe_count = 0;
759 acpi_irq_handled = 0;
760 acpi_irq_not_handled = 0;
761 goto end;
762 }
763
764 /* show the event status for both GPEs and Fixed Events */
765 result = get_status(index, &status, &handle);
766 if (result)
767 goto end;
768
769 if (!(status & ACPI_EVENT_FLAG_HAS_HANDLER)) {
770 printk(KERN_WARNING PREFIX
771 "Can not change Invalid GPE/Fixed Event status\n");
772 return -EINVAL;
773 }
774
775 if (index < num_gpes) {
776 if (!strcmp(buf, "disable\n") &&
777 (status & ACPI_EVENT_FLAG_ENABLED))
778 result = acpi_disable_gpe(handle, index);
779 else if (!strcmp(buf, "enable\n") &&
780 !(status & ACPI_EVENT_FLAG_ENABLED))
781 result = acpi_enable_gpe(handle, index);
782 else if (!strcmp(buf, "clear\n") &&
783 (status & ACPI_EVENT_FLAG_STATUS_SET))
784 result = acpi_clear_gpe(handle, index);
785 else if (!strcmp(buf, "mask\n"))
786 result = acpi_mask_gpe(handle, index, TRUE);
787 else if (!strcmp(buf, "unmask\n"))
788 result = acpi_mask_gpe(handle, index, FALSE);
789 else if (!kstrtoul(buf, 0, &tmp))
790 all_counters[index].count = tmp;
791 else
792 result = -EINVAL;
793 } else if (index < num_gpes + ACPI_NUM_FIXED_EVENTS) {
794 int event = index - num_gpes;
795 if (!strcmp(buf, "disable\n") &&
796 (status & ACPI_EVENT_FLAG_ENABLE_SET))
797 result = acpi_disable_event(event, ACPI_NOT_ISR);
798 else if (!strcmp(buf, "enable\n") &&
799 !(status & ACPI_EVENT_FLAG_ENABLE_SET))
800 result = acpi_enable_event(event, ACPI_NOT_ISR);
801 else if (!strcmp(buf, "clear\n") &&
802 (status & ACPI_EVENT_FLAG_STATUS_SET))
803 result = acpi_clear_event(event);
804 else if (!kstrtoul(buf, 0, &tmp))
805 all_counters[index].count = tmp;
806 else
807 result = -EINVAL;
808 } else
809 all_counters[index].count = strtoul(buf, NULL, 0);
810
811 if (ACPI_FAILURE(result))
812 result = -EINVAL;
813 end:
814 return result ? result : size;
815 }
816
817 /*
818 * A Quirk Mechanism for GPE Flooding Prevention:
819 *
820 * Quirks may be needed to prevent GPE flooding on a specific GPE. The
821 * flooding typically cannot be detected and automatically prevented by
822 * ACPI_GPE_DISPATCH_NONE check because there is a _Lxx/_Exx prepared in
823 * the AML tables. This normally indicates a feature gap in Linux, thus
824 * instead of providing endless quirk tables, we provide a boot parameter
825 * for those who want this quirk. For example, if the users want to prevent
826 * the GPE flooding for GPE 00, they need to specify the following boot
827 * parameter:
828 * acpi_mask_gpe=0x00
829 * The masking status can be modified by the following runtime controlling
830 * interface:
831 * echo unmask > /sys/firmware/acpi/interrupts/gpe00
832 */
833 #define ACPI_MASKABLE_GPE_MAX 0x100
834 static DECLARE_BITMAP(acpi_masked_gpes_map, ACPI_MASKABLE_GPE_MAX) __initdata;
835
acpi_gpe_set_masked_gpes(char * val)836 static int __init acpi_gpe_set_masked_gpes(char *val)
837 {
838 u8 gpe;
839
840 if (kstrtou8(val, 0, &gpe))
841 return -EINVAL;
842 set_bit(gpe, acpi_masked_gpes_map);
843
844 return 1;
845 }
846 __setup("acpi_mask_gpe=", acpi_gpe_set_masked_gpes);
847
acpi_gpe_apply_masked_gpes(void)848 void __init acpi_gpe_apply_masked_gpes(void)
849 {
850 acpi_handle handle;
851 acpi_status status;
852 u16 gpe;
853
854 for_each_set_bit(gpe, acpi_masked_gpes_map, ACPI_MASKABLE_GPE_MAX) {
855 status = acpi_get_gpe_device(gpe, &handle);
856 if (ACPI_SUCCESS(status)) {
857 pr_info("Masking GPE 0x%x.\n", gpe);
858 (void)acpi_mask_gpe(handle, gpe, TRUE);
859 }
860 }
861 }
862
acpi_irq_stats_init(void)863 void acpi_irq_stats_init(void)
864 {
865 acpi_status status;
866 int i;
867
868 if (all_counters)
869 return;
870
871 num_gpes = acpi_current_gpe_count;
872 num_counters = num_gpes + ACPI_NUM_FIXED_EVENTS + NUM_COUNTERS_EXTRA;
873
874 all_attrs = kcalloc(num_counters + 1, sizeof(struct attribute *),
875 GFP_KERNEL);
876 if (all_attrs == NULL)
877 return;
878
879 all_counters = kcalloc(num_counters, sizeof(struct event_counter),
880 GFP_KERNEL);
881 if (all_counters == NULL)
882 goto fail;
883
884 status = acpi_install_global_event_handler(acpi_global_event_handler, NULL);
885 if (ACPI_FAILURE(status))
886 goto fail;
887
888 counter_attrs = kcalloc(num_counters, sizeof(struct kobj_attribute),
889 GFP_KERNEL);
890 if (counter_attrs == NULL)
891 goto fail;
892
893 for (i = 0; i < num_counters; ++i) {
894 char buffer[12];
895 char *name;
896
897 if (i < num_gpes)
898 sprintf(buffer, "gpe%02X", i);
899 else if (i == num_gpes + ACPI_EVENT_PMTIMER)
900 sprintf(buffer, "ff_pmtimer");
901 else if (i == num_gpes + ACPI_EVENT_GLOBAL)
902 sprintf(buffer, "ff_gbl_lock");
903 else if (i == num_gpes + ACPI_EVENT_POWER_BUTTON)
904 sprintf(buffer, "ff_pwr_btn");
905 else if (i == num_gpes + ACPI_EVENT_SLEEP_BUTTON)
906 sprintf(buffer, "ff_slp_btn");
907 else if (i == num_gpes + ACPI_EVENT_RTC)
908 sprintf(buffer, "ff_rt_clk");
909 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE)
910 sprintf(buffer, "gpe_all");
911 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI)
912 sprintf(buffer, "sci");
913 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT)
914 sprintf(buffer, "sci_not");
915 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR)
916 sprintf(buffer, "error");
917 else
918 sprintf(buffer, "bug%02X", i);
919
920 name = kstrdup(buffer, GFP_KERNEL);
921 if (name == NULL)
922 goto fail;
923
924 sysfs_attr_init(&counter_attrs[i].attr);
925 counter_attrs[i].attr.name = name;
926 counter_attrs[i].attr.mode = 0644;
927 counter_attrs[i].show = counter_show;
928 counter_attrs[i].store = counter_set;
929
930 all_attrs[i] = &counter_attrs[i].attr;
931 }
932
933 interrupt_stats_attr_group.attrs = all_attrs;
934 if (!sysfs_create_group(acpi_kobj, &interrupt_stats_attr_group))
935 return;
936
937 fail:
938 delete_gpe_attr_array();
939 return;
940 }
941
interrupt_stats_exit(void)942 static void __exit interrupt_stats_exit(void)
943 {
944 sysfs_remove_group(acpi_kobj, &interrupt_stats_attr_group);
945
946 delete_gpe_attr_array();
947
948 return;
949 }
950
951 static ssize_t
acpi_show_profile(struct kobject * kobj,struct kobj_attribute * attr,char * buf)952 acpi_show_profile(struct kobject *kobj, struct kobj_attribute *attr,
953 char *buf)
954 {
955 return sprintf(buf, "%d\n", acpi_gbl_FADT.preferred_profile);
956 }
957
958 static const struct kobj_attribute pm_profile_attr =
959 __ATTR(pm_profile, S_IRUGO, acpi_show_profile, NULL);
960
hotplug_enabled_show(struct kobject * kobj,struct kobj_attribute * attr,char * buf)961 static ssize_t hotplug_enabled_show(struct kobject *kobj,
962 struct kobj_attribute *attr, char *buf)
963 {
964 struct acpi_hotplug_profile *hotplug = to_acpi_hotplug_profile(kobj);
965
966 return sprintf(buf, "%d\n", hotplug->enabled);
967 }
968
hotplug_enabled_store(struct kobject * kobj,struct kobj_attribute * attr,const char * buf,size_t size)969 static ssize_t hotplug_enabled_store(struct kobject *kobj,
970 struct kobj_attribute *attr,
971 const char *buf, size_t size)
972 {
973 struct acpi_hotplug_profile *hotplug = to_acpi_hotplug_profile(kobj);
974 unsigned int val;
975
976 if (kstrtouint(buf, 10, &val) || val > 1)
977 return -EINVAL;
978
979 acpi_scan_hotplug_enabled(hotplug, val);
980 return size;
981 }
982
983 static struct kobj_attribute hotplug_enabled_attr =
984 __ATTR(enabled, S_IRUGO | S_IWUSR, hotplug_enabled_show,
985 hotplug_enabled_store);
986
987 static struct attribute *hotplug_profile_attrs[] = {
988 &hotplug_enabled_attr.attr,
989 NULL
990 };
991
992 static struct kobj_type acpi_hotplug_profile_ktype = {
993 .sysfs_ops = &kobj_sysfs_ops,
994 .default_attrs = hotplug_profile_attrs,
995 };
996
acpi_sysfs_add_hotplug_profile(struct acpi_hotplug_profile * hotplug,const char * name)997 void acpi_sysfs_add_hotplug_profile(struct acpi_hotplug_profile *hotplug,
998 const char *name)
999 {
1000 int error;
1001
1002 if (!hotplug_kobj)
1003 goto err_out;
1004
1005 error = kobject_init_and_add(&hotplug->kobj,
1006 &acpi_hotplug_profile_ktype, hotplug_kobj, "%s", name);
1007 if (error) {
1008 kobject_put(&hotplug->kobj);
1009 goto err_out;
1010 }
1011
1012 kobject_uevent(&hotplug->kobj, KOBJ_ADD);
1013 return;
1014
1015 err_out:
1016 pr_err(PREFIX "Unable to add hotplug profile '%s'\n", name);
1017 }
1018
force_remove_show(struct kobject * kobj,struct kobj_attribute * attr,char * buf)1019 static ssize_t force_remove_show(struct kobject *kobj,
1020 struct kobj_attribute *attr, char *buf)
1021 {
1022 return sprintf(buf, "%d\n", 0);
1023 }
1024
force_remove_store(struct kobject * kobj,struct kobj_attribute * attr,const char * buf,size_t size)1025 static ssize_t force_remove_store(struct kobject *kobj,
1026 struct kobj_attribute *attr,
1027 const char *buf, size_t size)
1028 {
1029 bool val;
1030 int ret;
1031
1032 ret = strtobool(buf, &val);
1033 if (ret < 0)
1034 return ret;
1035
1036 if (val) {
1037 pr_err("Enabling force_remove is not supported anymore. Please report to linux-acpi@vger.kernel.org if you depend on this functionality\n");
1038 return -EINVAL;
1039 }
1040 return size;
1041 }
1042
1043 static const struct kobj_attribute force_remove_attr =
1044 __ATTR(force_remove, S_IRUGO | S_IWUSR, force_remove_show,
1045 force_remove_store);
1046
acpi_sysfs_init(void)1047 int __init acpi_sysfs_init(void)
1048 {
1049 int result;
1050
1051 result = acpi_tables_sysfs_init();
1052 if (result)
1053 return result;
1054
1055 hotplug_kobj = kobject_create_and_add("hotplug", acpi_kobj);
1056 if (!hotplug_kobj)
1057 return -ENOMEM;
1058
1059 result = sysfs_create_file(hotplug_kobj, &force_remove_attr.attr);
1060 if (result)
1061 return result;
1062
1063 result = sysfs_create_file(acpi_kobj, &pm_profile_attr.attr);
1064 return result;
1065 }
1066