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