drivers/acpi/sysfs.c

   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
  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
 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, &param_ops_debug_layer, &acpi_dbg_layer, 0644);
 151 module_param_cb(debug_level, &param_ops_debug_level, &acpi_dbg_level, 0644);
 152
 153 static char trace_method_name[1024];
 154
 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
 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, &param_ops_trace_method, &trace_method_name, 0644);
 214 module_param_cb(trace_debug_layer, &param_ops_trace_attrib, &acpi_gbl_trace_dbg_layer, 0644);
 215 module_param_cb(trace_debug_level, &param_ops_trace_attrib, &acpi_gbl_trace_dbg_level, 0644);
 216
 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
 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 */
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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  */
 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
 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
 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
 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
 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
 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
 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
 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
 954 static struct kobj_type acpi_hotplug_profile_ktype = {
 955         .sysfs_ops = &kobj_sysfs_ops,
 956         .default_attrs = hotplug_profile_attrs,
 957 };
 958
 959 void acpi_sysfs_add_hotplug_profile(struct acpi_hotplug_profile *hotplug,
 960                                     const char *name)
 961 {
 962         int error;
 963
 964         if (!hotplug_kobj)
 965                 goto err_out;
 966
 967         error = kobject_init_and_add(&hotplug->kobj,
 968                 &acpi_hotplug_profile_ktype, hotplug_kobj, "%s", name);
 969         if (error) {
 970                 kobject_put(&hotplug->kobj);
 971                 goto err_out;
 972         }
 973
 974         kobject_uevent(&hotplug->kobj, KOBJ_ADD);
 975         return;
 976
 977  err_out:
 978         pr_err("Unable to add hotplug profile '%s'\n", name);
 979 }
 980
 981 static ssize_t force_remove_show(struct kobject *kobj,
 982                                  struct kobj_attribute *attr, char *buf)
 983 {
 984         return sprintf(buf, "%d\n", 0);
 985 }
 986
 987 static ssize_t force_remove_store(struct kobject *kobj,
 988                                   struct kobj_attribute *attr,
 989                                   const char *buf, size_t size)
 990 {
 991         bool val;
 992         int ret;
 993
 994         ret = strtobool(buf, &val);
 995         if (ret < 0)
 996                 return ret;
 997
 998         if (val) {
 999                 pr_err("Enabling force_remove is not supported anymore. Please report to linux-acpi@vger.kernel.org if you depend on this functionality\n");
1000                 return -EINVAL;
1001         }
1002         return size;
1003 }
1004
1005 static const struct kobj_attribute force_remove_attr = __ATTR_RW(force_remove);
1006
1007 int __init acpi_sysfs_init(void)
1008 {
1009         int result;
1010
1011         result = acpi_tables_sysfs_init();
1012         if (result)
1013                 return result;
1014
1015         hotplug_kobj = kobject_create_and_add("hotplug", acpi_kobj);
1016         if (!hotplug_kobj)
1017                 return -ENOMEM;
1018
1019         result = sysfs_create_file(hotplug_kobj, &force_remove_attr.attr);
1020         if (result)
1021                 return result;
1022
1023         result = sysfs_create_file(acpi_kobj, &pm_profile_attr.attr);
1024         return result;
1025 }