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Merge tag 'mtd/for-5.1' of git://git.infradead.org/linux-mtd
[linux-2.6-block.git] / drivers / acpi / sysfs.c
CommitLineData
b2441318 1// SPDX-License-Identifier: GPL-2.0
1c8fce27
ZR		 2/*
3 * sysfs.c - ACPI sysfs interface to userspace.
4 */
5
7db8d1d9
RW		 6#define pr_fmt(fmt) "ACPI: " fmt
7
1c8fce27
ZR		 8#include <linux/init.h>
9#include <linux/kernel.h>
10#include <linux/moduleparam.h>
8b48463f 11#include <linux/acpi.h>
1c8fce27 12
3f8055c3
RW		 13#include "internal.h"
14
1c8fce27
ZR		 15#define _COMPONENT ACPI_SYSTEM_COMPONENT
16ACPI_MODULE_NAME("sysfs");
17
1c8fce27
ZR		 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
29struct acpi_dlayer {
30 const char *name;
31 unsigned long value;
32};
33struct acpi_dlevel {
34 const char *name;
35 unsigned long value;
36};
37#define ACPI_DEBUG_INIT(v) { .name = #v, .value = v }
38
39static 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
71static 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),
93d98831 75 ACPI_DEBUG_INIT(ACPI_LV_REPAIR),
7901a052 76 ACPI_DEBUG_INIT(ACPI_LV_TRACE_POINT),
1c8fce27
ZR		 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
ec652b35 108static int param_get_debug_layer(char *buffer, const struct kernel_param *kp)
1c8fce27
ZR		 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
ec652b35 136static int param_get_debug_level(char *buffer, const struct kernel_param *kp)
1c8fce27
ZR		 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
9c8b04be 157static const struct kernel_param_ops param_ops_debug_layer = {
ec652b35
ZR		 158 .set = param_set_uint,
159 .get = param_get_debug_layer,
160};
161
9c8b04be 162static const struct kernel_param_ops param_ops_debug_level = {
ec652b35
ZR		 163 .set = param_set_uint,
164 .get = param_get_debug_level,
165};
166
167module_param_cb(debug_layer, &param_ops_debug_layer, &acpi_dbg_layer, 0644);
168module_param_cb(debug_level, &param_ops_debug_level, &acpi_dbg_level, 0644);
1c8fce27 169
a0186bcf 170static char trace_method_name[1024];
1c8fce27 171
3e87ead4
CIK		 172static int param_set_trace_method_name(const char *val,
173 const struct kernel_param *kp)
1c8fce27 174{
7901a052 175 u32 saved_flags = 0;
a0186bcf 176 bool is_abs_path = true;
1c8fce27 177
a0186bcf
LZ		 178 if (*val != '\\')
179 is_abs_path = false;
180
181 if ((is_abs_path && strlen(val) > 1023) ||
182 (!is_abs_path && strlen(val) > 1022)) {
7901a052
LZ		 183 pr_err("%s: string parameter too long\n", kp->name);
184 return -ENOSPC;
1c8fce27
ZR		 185 }
186
7901a052
LZ		 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
7901a052 198 /* This is a hack. We can't kmalloc in early boot. */
a0186bcf
LZ		 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 }
7901a052
LZ		 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);
1c8fce27 211
7901a052
LZ		 212 return 0;
213}
1c8fce27 214
7901a052
LZ		 215static int param_get_trace_method_name(char *buffer, const struct kernel_param *kp)
216{
217 return scnprintf(buffer, PAGE_SIZE, "%s", acpi_gbl_trace_method_name);
218}
219
220static 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
225static const struct kernel_param_ops param_ops_trace_attrib = {
226 .set = param_set_uint,
227 .get = param_get_uint,
228};
229
230module_param_cb(trace_method_name, &param_ops_trace_method, &trace_method_name, 0644);
231module_param_cb(trace_debug_layer, &param_ops_trace_attrib, &acpi_gbl_trace_dbg_layer, 0644);
232module_param_cb(trace_debug_level, &param_ops_trace_attrib, &acpi_gbl_trace_dbg_level, 0644);
233
e4dca7b7
KC		 234static int param_set_trace_state(const char *val,
235 const struct kernel_param *kp)
7901a052
LZ		 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;
1c8fce27
ZR		 269}
270
e4dca7b7 271static int param_get_trace_state(char *buffer, const struct kernel_param *kp)
1c8fce27 272{
7901a052 273 if (!(acpi_gbl_trace_flags & ACPI_TRACE_ENABLED))
1c8fce27
ZR		 274 return sprintf(buffer, "disable");
275 else {
7901a052
LZ		 276 if (acpi_gbl_trace_method_name) {
277 if (acpi_gbl_trace_flags & ACPI_TRACE_ONESHOT)
278 return sprintf(buffer, "method-once");
279 else
280 return sprintf(buffer, "method");
281 } else
1c8fce27
ZR		 282 return sprintf(buffer, "enable");
283 }
284 return 0;
285}
286
287module_param_call(trace_state, param_set_trace_state, param_get_trace_state,
288 NULL, 0644);
289#endif /* CONFIG_ACPI_DEBUG */
290
aecad432
TR		 291
292/* /sys/modules/acpi/parameters/aml_debug_output */
293
294module_param_named(aml_debug_output, acpi_gbl_enable_aml_debug_object,
481c1381 295 byte, 0644);
aecad432
TR		 296MODULE_PARM_DESC(aml_debug_output,
297 "To enable/disable the ACPI Debug Object output.");
298
1c8fce27 299/* /sys/module/acpi/parameters/acpica_version */
e4dca7b7
KC		 300static int param_get_acpica_version(char *buffer,
301 const struct kernel_param *kp)
1c8fce27
ZR		 302{
303 int result;
304
305 result = sprintf(buffer, "%x", ACPI_CA_VERSION);
306
307 return result;
308}
309
310module_param_call(acpica_version, NULL, param_get_acpica_version, NULL, 0444);
311
312/*
313 * ACPI table sysfs I/F:
314 * /sys/firmware/acpi/tables/
7dae6326 315 * /sys/firmware/acpi/tables/data/
1c8fce27
ZR		 316 * /sys/firmware/acpi/tables/dynamic/
317 */
318
319static LIST_HEAD(acpi_table_attr_list);
320static struct kobject *tables_kobj;
7dae6326 321static struct kobject *tables_data_kobj;
1c8fce27 322static struct kobject *dynamic_tables_kobj;
3f8055c3 323static struct kobject *hotplug_kobj;
1c8fce27 324
914c6194
LZ		 325#define ACPI_MAX_TABLE_INSTANCES 999
326#define ACPI_INST_SIZE 4 /* including trailing 0 */
327
1c8fce27
ZR		 328struct acpi_table_attr {
329 struct bin_attribute attr;
914c6194 330 char name[ACPI_NAME_SIZE];
1c8fce27 331 int instance;
914c6194 332 char filename[ACPI_NAME_SIZE+ACPI_INST_SIZE];
1c8fce27
ZR		 333 struct list_head node;
334};
335
7dae6326
TL		 336struct acpi_data_attr {
337 struct bin_attribute attr;
338 u64 addr;
339};
340
1c8fce27
ZR		 341static 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;
0de0e198 349 ssize_t rc;
1c8fce27 350
914c6194
LZ		 351 status = acpi_get_table(table_attr->name, table_attr->instance,
352 &table_header);
1c8fce27
ZR		 353 if (ACPI_FAILURE(status))
354 return -ENODEV;
355
0de0e198
DW		 356 rc = memory_read_from_buffer(buf, count, &offset, table_header,
357 table_header->length);
358 acpi_put_table(table_header);
359 return rc;
1c8fce27
ZR		 360}
361
914c6194
LZ		 362static int acpi_table_attr_init(struct kobject *tables_obj,
363 struct acpi_table_attr *table_attr,
364 struct acpi_table_header *table_header)
1c8fce27
ZR		 365{
366 struct acpi_table_header *header = NULL;
367 struct acpi_table_attr *attr = NULL;
914c6194 368 char instance_str[ACPI_INST_SIZE];
1c8fce27
ZR		 369
370 sysfs_attr_init(&table_attr->attr.attr);
914c6194 371 ACPI_MOVE_NAME(table_attr->name, table_header->signature);
1c8fce27
ZR		 372
373 list_for_each_entry(attr, &acpi_table_attr_list, node) {
914c6194 374 if (ACPI_COMPARE_NAME(table_attr->name, attr->name))
1c8fce27
ZR		 375 if (table_attr->instance < attr->instance)
376 table_attr->instance = attr->instance;
377 }
378 table_attr->instance++;
914c6194
LZ		 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 }
1c8fce27 384
914c6194
LZ		 385 ACPI_MOVE_NAME(table_attr->filename, table_header->signature);
386 table_attr->filename[ACPI_NAME_SIZE] = '\0';
1c8fce27
ZR		 387 if (table_attr->instance > 1 || (table_attr->instance == 1 &&
388 !acpi_get_table
914c6194
LZ		 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 }
1c8fce27 394
083ca8c4 395 table_attr->attr.size = table_header->length;
1c8fce27 396 table_attr->attr.read = acpi_table_show;
914c6194 397 table_attr->attr.attr.name = table_attr->filename;
1c8fce27
ZR		 398 table_attr->attr.attr.mode = 0400;
399
914c6194 400 return sysfs_create_bin_file(tables_obj, &table_attr->attr);
1c8fce27
ZR		 401}
402
68bdb677 403acpi_status acpi_sysfs_table_handler(u32 event, void *table, void *context)
1c8fce27
ZR		 404{
405 struct acpi_table_attr *table_attr;
406
407 switch (event) {
307ecb0a 408 case ACPI_TABLE_EVENT_INSTALL:
1c8fce27
ZR		 409 table_attr =
410 kzalloc(sizeof(struct acpi_table_attr), GFP_KERNEL);
411 if (!table_attr)
412 return AE_NO_MEMORY;
413
914c6194
LZ		 414 if (acpi_table_attr_init(dynamic_tables_kobj,
415 table_attr, table)) {
1c8fce27
ZR		 416 kfree(table_attr);
417 return AE_ERROR;
914c6194
LZ		 418 }
419 list_add_tail(&table_attr->node, &acpi_table_attr_list);
1c8fce27 420 break;
307ecb0a 421 case ACPI_TABLE_EVENT_LOAD:
1c8fce27 422 case ACPI_TABLE_EVENT_UNLOAD:
307ecb0a 423 case ACPI_TABLE_EVENT_UNINSTALL:
1c8fce27
ZR		 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
7dae6326
TL		 436static 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 rc;
443
444 data_attr = container_of(bin_attr, struct acpi_data_attr, attr);
445
446 base = acpi_os_map_memory(data_attr->addr, data_attr->attr.size);
447 if (!base)
448 return -ENOMEM;
449 rc = memory_read_from_buffer(buf, count, &offset, base,
450 data_attr->attr.size);
451 acpi_os_unmap_memory(base, data_attr->attr.size);
452
453 return rc;
454}
455
456static int acpi_bert_data_init(void *th, struct acpi_data_attr *data_attr)
457{
458 struct acpi_table_bert *bert = th;
459
460 if (bert->header.length < sizeof(struct acpi_table_bert) ||
461 bert->region_length < sizeof(struct acpi_hest_generic_status)) {
462 kfree(data_attr);
463 return -EINVAL;
464 }
465 data_attr->addr = bert->address;
466 data_attr->attr.size = bert->region_length;
467 data_attr->attr.attr.name = "BERT";
468
469 return sysfs_create_bin_file(tables_data_kobj, &data_attr->attr);
470}
471
472static struct acpi_data_obj {
473 char *name;
474 int (*fn)(void *, struct acpi_data_attr *);
475} acpi_data_objs[] = {
476 { ACPI_SIG_BERT, acpi_bert_data_init },
477};
478
479#define NUM_ACPI_DATA_OBJS ARRAY_SIZE(acpi_data_objs)
480
481static int acpi_table_data_init(struct acpi_table_header *th)
482{
483 struct acpi_data_attr *data_attr;
484 int i;
485
486 for (i = 0; i < NUM_ACPI_DATA_OBJS; i++) {
487 if (ACPI_COMPARE_NAME(th->signature, acpi_data_objs[i].name)) {
488 data_attr = kzalloc(sizeof(*data_attr), GFP_KERNEL);
489 if (!data_attr)
490 return -ENOMEM;
491 sysfs_attr_init(&data_attr->attr.attr);
492 data_attr->attr.read = acpi_data_show;
493 data_attr->attr.attr.mode = 0400;
494 return acpi_data_objs[i].fn(th, data_attr);
495 }
496 }
497 return 0;
498}
499
1c8fce27
ZR		 500static int acpi_tables_sysfs_init(void)
501{
502 struct acpi_table_attr *table_attr;
503 struct acpi_table_header *table_header = NULL;
de03beed
JC		 504 int table_index;
505 acpi_status status;
506 int ret;
1c8fce27
ZR		 507
508 tables_kobj = kobject_create_and_add("tables", acpi_kobj);
509 if (!tables_kobj)
510 goto err;
511
7dae6326
TL		 512 tables_data_kobj = kobject_create_and_add("data", tables_kobj);
513 if (!tables_data_kobj)
514 goto err_tables_data;
515
1c8fce27
ZR		 516 dynamic_tables_kobj = kobject_create_and_add("dynamic", tables_kobj);
517 if (!dynamic_tables_kobj)
518 goto err_dynamic_tables;
519
de03beed
JC		 520 for (table_index = 0;; table_index++) {
521 status = acpi_get_table_by_index(table_index, &table_header);
522
523 if (status == AE_BAD_PARAMETER)
524 break;
525
526 if (ACPI_FAILURE(status))
527 continue;
528
de03beed
JC		 529 table_attr = kzalloc(sizeof(*table_attr), GFP_KERNEL);
530 if (!table_attr)
531 return -ENOMEM;
532
914c6194
LZ		 533 ret = acpi_table_attr_init(tables_kobj,
534 table_attr, table_header);
de03beed
JC		 535 if (ret) {
536 kfree(table_attr);
537 return ret;
1c8fce27 538 }
de03beed 539 list_add_tail(&table_attr->node, &acpi_table_attr_list);
7dae6326 540 acpi_table_data_init(table_header);
de03beed
JC		 541 }
542
1c8fce27 543 kobject_uevent(tables_kobj, KOBJ_ADD);
7dae6326 544 kobject_uevent(tables_data_kobj, KOBJ_ADD);
1c8fce27 545 kobject_uevent(dynamic_tables_kobj, KOBJ_ADD);
1c8fce27 546
68bdb677 547 return 0;
1c8fce27 548err_dynamic_tables:
7dae6326
TL		 549 kobject_put(tables_data_kobj);
550err_tables_data:
1c8fce27
ZR		 551 kobject_put(tables_kobj);
552err:
553 return -ENOMEM;
554}
555
556/*
557 * Detailed ACPI IRQ counters:
558 * /sys/firmware/acpi/interrupts/
559 */
560
561u32 acpi_irq_handled;
562u32 acpi_irq_not_handled;
563
564#define COUNT_GPE 0
565#define COUNT_SCI 1 /* acpi_irq_handled */
566#define COUNT_SCI_NOT 2 /* acpi_irq_not_handled */
567#define COUNT_ERROR 3 /* other */
568#define NUM_COUNTERS_EXTRA 4
569
570struct event_counter {
571 u32 count;
572 u32 flags;
573};
574
575static struct event_counter *all_counters;
576static u32 num_gpes;
577static u32 num_counters;
578static struct attribute **all_attrs;
579static u32 acpi_gpe_count;
580
581static struct attribute_group interrupt_stats_attr_group = {
582 .name = "interrupts",
583};
584
585static struct kobj_attribute *counter_attrs;
586
587static void delete_gpe_attr_array(void)
588{
589 struct event_counter *tmp = all_counters;
590
591 all_counters = NULL;
592 kfree(tmp);
593
594 if (counter_attrs) {
595 int i;
596
597 for (i = 0; i < num_gpes; i++)
598 kfree(counter_attrs[i].attr.name);
599
600 kfree(counter_attrs);
601 }
602 kfree(all_attrs);
603
604 return;
605}
606
a0fcdb23 607static void gpe_count(u32 gpe_number)
1c8fce27
ZR		 608{
609 acpi_gpe_count++;
610
611 if (!all_counters)
612 return;
613
614 if (gpe_number < num_gpes)
615 all_counters[gpe_number].count++;
616 else
617 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS +
618 COUNT_ERROR].count++;
619
620 return;
621}
622
a0fcdb23 623static void fixed_event_count(u32 event_number)
1c8fce27
ZR		 624{
625 if (!all_counters)
626 return;
627
628 if (event_number < ACPI_NUM_FIXED_EVENTS)
629 all_counters[num_gpes + event_number].count++;
630 else
631 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS +
632 COUNT_ERROR].count++;
633
634 return;
635}
636
644ef74e 637static void acpi_global_event_handler(u32 event_type, acpi_handle device,
a0fcdb23
LM		 638 u32 event_number, void *context)
639{
7db8d1d9 640 if (event_type == ACPI_EVENT_TYPE_GPE) {
a0fcdb23 641 gpe_count(event_number);
7db8d1d9
RW		 642 pr_debug("GPE event 0x%02x\n", event_number);
643 } else if (event_type == ACPI_EVENT_TYPE_FIXED) {
a0fcdb23 644 fixed_event_count(event_number);
7db8d1d9
RW		 645 pr_debug("Fixed event 0x%02x\n", event_number);
646 } else {
647 pr_debug("Other event 0x%02x\n", event_number);
648 }
a0fcdb23
LM		 649}
650
1c8fce27
ZR		 651static int get_status(u32 index, acpi_event_status *status,
652 acpi_handle *handle)
653{
f18ebc21 654 int result;
1c8fce27
ZR		 655
656 if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
f18ebc21 657 return -EINVAL;
1c8fce27
ZR		 658
659 if (index < num_gpes) {
660 result = acpi_get_gpe_device(index, handle);
661 if (result) {
662 ACPI_EXCEPTION((AE_INFO, AE_NOT_FOUND,
c6284237 663 "Invalid GPE 0x%x", index));
f18ebc21 664 return result;
1c8fce27
ZR		 665 }
666 result = acpi_get_gpe_status(*handle, index, status);
667 } else if (index < (num_gpes + ACPI_NUM_FIXED_EVENTS))
668 result = acpi_get_event_status(index - num_gpes, status);
669
1c8fce27
ZR		 670 return result;
671}
672
673static ssize_t counter_show(struct kobject *kobj,
674 struct kobj_attribute *attr, char *buf)
675{
676 int index = attr - counter_attrs;
677 int size;
678 acpi_handle handle;
679 acpi_event_status status;
680 int result = 0;
681
682 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI].count =
683 acpi_irq_handled;
684 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT].count =
685 acpi_irq_not_handled;
686 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE].count =
687 acpi_gpe_count;
7b1a1322 688 size = sprintf(buf, "%8u", all_counters[index].count);
1c8fce27
ZR		 689
690 /* "gpe_all" or "sci" */
691 if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
692 goto end;
693
694 result = get_status(index, &status, &handle);
695 if (result)
696 goto end;
697
18864cc4
LZ		 698 if (status & ACPI_EVENT_FLAG_ENABLE_SET)
699 size += sprintf(buf + size, " EN");
700 else
701 size += sprintf(buf + size, " ");
702 if (status & ACPI_EVENT_FLAG_STATUS_SET)
703 size += sprintf(buf + size, " STS");
704 else
705 size += sprintf(buf + size, " ");
706
2f857234 707 if (!(status & ACPI_EVENT_FLAG_HAS_HANDLER))
18864cc4 708 size += sprintf(buf + size, " invalid ");
1c8fce27 709 else if (status & ACPI_EVENT_FLAG_ENABLED)
18864cc4 710 size += sprintf(buf + size, " enabled ");
1c8fce27 711 else if (status & ACPI_EVENT_FLAG_WAKE_ENABLED)
18864cc4 712 size += sprintf(buf + size, " wake_enabled");
1c8fce27 713 else
18864cc4
LZ		 714 size += sprintf(buf + size, " disabled ");
715 if (status & ACPI_EVENT_FLAG_MASKED)
716 size += sprintf(buf + size, " masked ");
717 else
718 size += sprintf(buf + size, " unmasked");
1c8fce27
ZR		 719
720end:
721 size += sprintf(buf + size, "\n");
722 return result ? result : size;
723}
724
725/*
726 * counter_set() sets the specified counter.
727 * setting the total "sci" file to any value clears all counters.
728 * enable/disable/clear a gpe/fixed event in user space.
729 */
730static ssize_t counter_set(struct kobject *kobj,
731 struct kobj_attribute *attr, const char *buf,
732 size_t size)
733{
734 int index = attr - counter_attrs;
735 acpi_event_status status;
736 acpi_handle handle;
737 int result = 0;
c48b1565 738 unsigned long tmp;
1c8fce27
ZR		 739
740 if (index == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI) {
741 int i;
742 for (i = 0; i < num_counters; ++i)
743 all_counters[i].count = 0;
744 acpi_gpe_count = 0;
745 acpi_irq_handled = 0;
746 acpi_irq_not_handled = 0;
747 goto end;
748 }
749
750 /* show the event status for both GPEs and Fixed Events */
751 result = get_status(index, &status, &handle);
752 if (result)
753 goto end;
754
2f857234 755 if (!(status & ACPI_EVENT_FLAG_HAS_HANDLER)) {
1c8fce27
ZR		 756 printk(KERN_WARNING PREFIX
757 "Can not change Invalid GPE/Fixed Event status\n");
758 return -EINVAL;
759 }
760
761 if (index < num_gpes) {
762 if (!strcmp(buf, "disable\n") &&
763 (status & ACPI_EVENT_FLAG_ENABLED))
764 result = acpi_disable_gpe(handle, index);
765 else if (!strcmp(buf, "enable\n") &&
766 !(status & ACPI_EVENT_FLAG_ENABLED))
767 result = acpi_enable_gpe(handle, index);
768 else if (!strcmp(buf, "clear\n") &&
18864cc4 769 (status & ACPI_EVENT_FLAG_STATUS_SET))
1c8fce27 770 result = acpi_clear_gpe(handle, index);
18864cc4
LZ		 771 else if (!strcmp(buf, "mask\n"))
772 result = acpi_mask_gpe(handle, index, TRUE);
773 else if (!strcmp(buf, "unmask\n"))
774 result = acpi_mask_gpe(handle, index, FALSE);
c48b1565
LT		 775 else if (!kstrtoul(buf, 0, &tmp))
776 all_counters[index].count = tmp;
1c8fce27 777 else
c48b1565 778 result = -EINVAL;
1c8fce27
ZR		 779 } else if (index < num_gpes + ACPI_NUM_FIXED_EVENTS) {
780 int event = index - num_gpes;
781 if (!strcmp(buf, "disable\n") &&
18864cc4 782 (status & ACPI_EVENT_FLAG_ENABLE_SET))
1c8fce27
ZR		 783 result = acpi_disable_event(event, ACPI_NOT_ISR);
784 else if (!strcmp(buf, "enable\n") &&
18864cc4 785 !(status & ACPI_EVENT_FLAG_ENABLE_SET))
1c8fce27
ZR		 786 result = acpi_enable_event(event, ACPI_NOT_ISR);
787 else if (!strcmp(buf, "clear\n") &&
18864cc4 788 (status & ACPI_EVENT_FLAG_STATUS_SET))
1c8fce27 789 result = acpi_clear_event(event);
c48b1565
LT		 790 else if (!kstrtoul(buf, 0, &tmp))
791 all_counters[index].count = tmp;
1c8fce27 792 else
c48b1565 793 result = -EINVAL;
1c8fce27
ZR		 794 } else
795 all_counters[index].count = strtoul(buf, NULL, 0);
796
797 if (ACPI_FAILURE(result))
798 result = -EINVAL;
799end:
800 return result ? result : size;
801}
802
9c4aa1ee
LZ		 803/*
804 * A Quirk Mechanism for GPE Flooding Prevention:
805 *
806 * Quirks may be needed to prevent GPE flooding on a specific GPE. The
807 * flooding typically cannot be detected and automatically prevented by
808 * ACPI_GPE_DISPATCH_NONE check because there is a _Lxx/_Exx prepared in
809 * the AML tables. This normally indicates a feature gap in Linux, thus
810 * instead of providing endless quirk tables, we provide a boot parameter
811 * for those who want this quirk. For example, if the users want to prevent
812 * the GPE flooding for GPE 00, they need to specify the following boot
813 * parameter:
814 * acpi_mask_gpe=0x00
815 * The masking status can be modified by the following runtime controlling
816 * interface:
817 * echo unmask > /sys/firmware/acpi/interrupts/gpe00
818 */
0f27cff8
PB		 819#define ACPI_MASKABLE_GPE_MAX 0xFF
820static DECLARE_BITMAP(acpi_masked_gpes_map, ACPI_MASKABLE_GPE_MAX) __initdata;
9c4aa1ee
LZ		 821
822static int __init acpi_gpe_set_masked_gpes(char *val)
823{
824 u8 gpe;
825
826 if (kstrtou8(val, 0, &gpe) || gpe > ACPI_MASKABLE_GPE_MAX)
827 return -EINVAL;
0f27cff8 828 set_bit(gpe, acpi_masked_gpes_map);
9c4aa1ee
LZ		 829
830 return 1;
831}
832__setup("acpi_mask_gpe=", acpi_gpe_set_masked_gpes);
833
834void __init acpi_gpe_apply_masked_gpes(void)
835{
836 acpi_handle handle;
837 acpi_status status;
838 u8 gpe;
839
0f27cff8
PB		 840 for_each_set_bit(gpe, acpi_masked_gpes_map, ACPI_MASKABLE_GPE_MAX) {
841 status = acpi_get_gpe_device(gpe, &handle);
842 if (ACPI_SUCCESS(status)) {
843 pr_info("Masking GPE 0x%x.\n", gpe);
844 (void)acpi_mask_gpe(handle, gpe, TRUE);
9c4aa1ee
LZ		 845 }
846 }
847}
848
1c8fce27
ZR		 849void acpi_irq_stats_init(void)
850{
a0fcdb23 851 acpi_status status;
1c8fce27
ZR		 852 int i;
853
854 if (all_counters)
855 return;
856
857 num_gpes = acpi_current_gpe_count;
858 num_counters = num_gpes + ACPI_NUM_FIXED_EVENTS + NUM_COUNTERS_EXTRA;
859
6396bb22 860 all_attrs = kcalloc(num_counters + 1, sizeof(struct attribute *),
1c8fce27
ZR		 861 GFP_KERNEL);
862 if (all_attrs == NULL)
863 return;
864
6396bb22 865 all_counters = kcalloc(num_counters, sizeof(struct event_counter),
1c8fce27
ZR		 866 GFP_KERNEL);
867 if (all_counters == NULL)
868 goto fail;
869
644ef74e 870 status = acpi_install_global_event_handler(acpi_global_event_handler, NULL);
a0fcdb23
LM		 871 if (ACPI_FAILURE(status))
872 goto fail;
873
6396bb22 874 counter_attrs = kcalloc(num_counters, sizeof(struct kobj_attribute),
1c8fce27
ZR		 875 GFP_KERNEL);
876 if (counter_attrs == NULL)
877 goto fail;
878
879 for (i = 0; i < num_counters; ++i) {
880 char buffer[12];
881 char *name;
882
883 if (i < num_gpes)
884 sprintf(buffer, "gpe%02X", i);
885 else if (i == num_gpes + ACPI_EVENT_PMTIMER)
886 sprintf(buffer, "ff_pmtimer");
887 else if (i == num_gpes + ACPI_EVENT_GLOBAL)
888 sprintf(buffer, "ff_gbl_lock");
889 else if (i == num_gpes + ACPI_EVENT_POWER_BUTTON)
890 sprintf(buffer, "ff_pwr_btn");
891 else if (i == num_gpes + ACPI_EVENT_SLEEP_BUTTON)
892 sprintf(buffer, "ff_slp_btn");
893 else if (i == num_gpes + ACPI_EVENT_RTC)
894 sprintf(buffer, "ff_rt_clk");
895 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE)
896 sprintf(buffer, "gpe_all");
897 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI)
898 sprintf(buffer, "sci");
899 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT)
900 sprintf(buffer, "sci_not");
901 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR)
902 sprintf(buffer, "error");
903 else
904 sprintf(buffer, "bug%02X", i);
905
096a8aac 906 name = kstrdup(buffer, GFP_KERNEL);
1c8fce27
ZR		 907 if (name == NULL)
908 goto fail;
1c8fce27
ZR		 909
910 sysfs_attr_init(&counter_attrs[i].attr);
911 counter_attrs[i].attr.name = name;
912 counter_attrs[i].attr.mode = 0644;
913 counter_attrs[i].show = counter_show;
914 counter_attrs[i].store = counter_set;
915
916 all_attrs[i] = &counter_attrs[i].attr;
917 }
918
919 interrupt_stats_attr_group.attrs = all_attrs;
920 if (!sysfs_create_group(acpi_kobj, &interrupt_stats_attr_group))
921 return;
922
923fail:
924 delete_gpe_attr_array();
925 return;
926}
927
928static void __exit interrupt_stats_exit(void)
929{
930 sysfs_remove_group(acpi_kobj, &interrupt_stats_attr_group);
931
932 delete_gpe_attr_array();
933
934 return;
935}
936
362b6460
TR		 937static ssize_t
938acpi_show_profile(struct device *dev, struct device_attribute *attr,
939 char *buf)
940{
941 return sprintf(buf, "%d\n", acpi_gbl_FADT.preferred_profile);
942}
943
944static const struct device_attribute pm_profile_attr =
945 __ATTR(pm_profile, S_IRUGO, acpi_show_profile, NULL);
946
3f8055c3
RW		 947static ssize_t hotplug_enabled_show(struct kobject *kobj,
948 struct kobj_attribute *attr, char *buf)
949{
950 struct acpi_hotplug_profile *hotplug = to_acpi_hotplug_profile(kobj);
951
952 return sprintf(buf, "%d\n", hotplug->enabled);
953}
954
955static ssize_t hotplug_enabled_store(struct kobject *kobj,
956 struct kobj_attribute *attr,
957 const char *buf, size_t size)
958{
959 struct acpi_hotplug_profile *hotplug = to_acpi_hotplug_profile(kobj);
960 unsigned int val;
961
962 if (kstrtouint(buf, 10, &val) || val > 1)
963 return -EINVAL;
964
965 acpi_scan_hotplug_enabled(hotplug, val);
966 return size;
967}
968
969static struct kobj_attribute hotplug_enabled_attr =
970 __ATTR(enabled, S_IRUGO | S_IWUSR, hotplug_enabled_show,
971 hotplug_enabled_store);
972
973static struct attribute *hotplug_profile_attrs[] = {
974 &hotplug_enabled_attr.attr,
975 NULL
976};
977
b09753ec 978static struct kobj_type acpi_hotplug_profile_ktype = {
3f8055c3
RW		 979 .sysfs_ops = &kobj_sysfs_ops,
980 .default_attrs = hotplug_profile_attrs,
981};
982
983void acpi_sysfs_add_hotplug_profile(struct acpi_hotplug_profile *hotplug,
984 const char *name)
985{
986 int error;
987
988 if (!hotplug_kobj)
989 goto err_out;
990
acd3e2c9
BH		 991 error = kobject_init_and_add(&hotplug->kobj,
992 &acpi_hotplug_profile_ktype, hotplug_kobj, "%s", name);
3f8055c3
RW		 993 if (error)
994 goto err_out;
995
996 kobject_uevent(&hotplug->kobj, KOBJ_ADD);
997 return;
998
999 err_out:
1000 pr_err(PREFIX "Unable to add hotplug profile '%s'\n", name);
1001}
1002
683058e3
RW		 1003static ssize_t force_remove_show(struct kobject *kobj,
1004 struct kobj_attribute *attr, char *buf)
1005{
ffc10d82 1006 return sprintf(buf, "%d\n", 0);
683058e3
RW		 1007}
1008
1009static ssize_t force_remove_store(struct kobject *kobj,
1010 struct kobj_attribute *attr,
1011 const char *buf, size_t size)
1012{
1013 bool val;
1014 int ret;
1015
1016 ret = strtobool(buf, &val);
1017 if (ret < 0)
1018 return ret;
1019
ffc10d82
MH		 1020 if (val) {
1021 pr_err("Enabling force_remove is not supported anymore. Please report to linux-acpi@vger.kernel.org if you depend on this functionality\n");
1022 return -EINVAL;
1023 }
683058e3
RW		 1024 return size;
1025}
1026
1027static const struct kobj_attribute force_remove_attr =
1028 __ATTR(force_remove, S_IRUGO | S_IWUSR, force_remove_show,
1029 force_remove_store);
1030
1c8fce27
ZR		 1031int __init acpi_sysfs_init(void)
1032{
1033 int result;
1034
1035 result = acpi_tables_sysfs_init();
362b6460
TR		 1036 if (result)
1037 return result;
3f8055c3
RW		 1038
1039 hotplug_kobj = kobject_create_and_add("hotplug", acpi_kobj);
bc1e49df
IY		 1040 if (!hotplug_kobj)
1041 return -ENOMEM;
1042
683058e3
RW		 1043 result = sysfs_create_file(hotplug_kobj, &force_remove_attr.attr);
1044 if (result)
1045 return result;
1046
362b6460 1047 result = sysfs_create_file(acpi_kobj, &pm_profile_attr.attr);
1c8fce27
ZR		 1048 return result;
1049}
Linux 6.x block layer and io_uring tree(s)