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