drivers/acpi/system.c

   1 /*
   2  *  acpi_system.c - ACPI System Driver ($Revision: 63 $)
   3  *
   4  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   6  *
   7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or (at
  12  *  your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful, but
  15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  *  General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License along
  20  *  with this program; if not, write to the Free Software Foundation, Inc.,
  21  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  22  *
  23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  24  */
  25
  26 #include <linux/proc_fs.h>
  27 #include <linux/seq_file.h>
  28 #include <linux/init.h>
  29 #include <linux/string.h>
  30 #include <asm/uaccess.h>
  31
  32 #include <acpi/acpi_drivers.h>
  33
  34 #define _COMPONENT              ACPI_SYSTEM_COMPONENT
  35 ACPI_MODULE_NAME("system");
  36 #ifdef MODULE_PARAM_PREFIX
  37 #undef MODULE_PARAM_PREFIX
  38 #endif
  39 #define MODULE_PARAM_PREFIX "acpi."
  40
  41 #define ACPI_SYSTEM_CLASS               "system"
  42 #define ACPI_SYSTEM_DEVICE_NAME         "System"
  43
  44 u32 acpi_irq_handled;
  45
  46 /*
  47  * Make ACPICA version work as module param
  48  */
  49 static int param_get_acpica_version(char *buffer, struct kernel_param *kp)
  50 {
  51         int result;
  52
  53         result = sprintf(buffer, "%x", ACPI_CA_VERSION);
  54
  55         return result;
  56 }
  57
  58 module_param_call(acpica_version, NULL, param_get_acpica_version, NULL, 0444);
  59
  60 /* --------------------------------------------------------------------------
  61                               FS Interface (/sys)
  62    -------------------------------------------------------------------------- */
  63 static LIST_HEAD(acpi_table_attr_list);
  64 static struct kobject *tables_kobj;
  65
  66 struct acpi_table_attr {
  67         struct bin_attribute attr;
  68         char name[8];
  69         int instance;
  70         struct list_head node;
  71 };
  72
  73 static ssize_t acpi_table_show(struct kobject *kobj,
  74                                struct bin_attribute *bin_attr, char *buf,
  75                                loff_t offset, size_t count)
  76 {
  77         struct acpi_table_attr *table_attr =
  78             container_of(bin_attr, struct acpi_table_attr, attr);
  79         struct acpi_table_header *table_header = NULL;
  80         acpi_status status;
  81
  82         status =
  83             acpi_get_table(table_attr->name, table_attr->instance,
  84                            &table_header);
  85         if (ACPI_FAILURE(status))
  86                 return -ENODEV;
  87
  88         return memory_read_from_buffer(buf, count, &offset,
  89                                         table_header, table_header->length);
  90 }
  91
  92 static void acpi_table_attr_init(struct acpi_table_attr *table_attr,
  93                                  struct acpi_table_header *table_header)
  94 {
  95         struct acpi_table_header *header = NULL;
  96         struct acpi_table_attr *attr = NULL;
  97
  98         memcpy(table_attr->name, table_header->signature, ACPI_NAME_SIZE);
  99
 100         list_for_each_entry(attr, &acpi_table_attr_list, node) {
 101                 if (!memcmp(table_header->signature, attr->name,
 102                             ACPI_NAME_SIZE))
 103                         if (table_attr->instance < attr->instance)
 104                                 table_attr->instance = attr->instance;
 105         }
 106         table_attr->instance++;
 107
 108         if (table_attr->instance > 1 || (table_attr->instance == 1 &&
 109                                          !acpi_get_table(table_header->
 110                                                          signature, 2,
 111                                                          &header)))
 112                 sprintf(table_attr->name + 4, "%d", table_attr->instance);
 113
 114         table_attr->attr.size = 0;
 115         table_attr->attr.read = acpi_table_show;
 116         table_attr->attr.attr.name = table_attr->name;
 117         table_attr->attr.attr.mode = 0444;
 118
 119         return;
 120 }
 121
 122 static int acpi_system_sysfs_init(void)
 123 {
 124         struct acpi_table_attr *table_attr;
 125         struct acpi_table_header *table_header = NULL;
 126         int table_index = 0;
 127         int result;
 128
 129         tables_kobj = kobject_create_and_add("tables", acpi_kobj);
 130         if (!tables_kobj)
 131                 return -ENOMEM;
 132
 133         do {
 134                 result = acpi_get_table_by_index(table_index, &table_header);
 135                 if (!result) {
 136                         table_index++;
 137                         table_attr = NULL;
 138                         table_attr =
 139                             kzalloc(sizeof(struct acpi_table_attr), GFP_KERNEL);
 140                         if (!table_attr)
 141                                 return -ENOMEM;
 142
 143                         acpi_table_attr_init(table_attr, table_header);
 144                         result =
 145                             sysfs_create_bin_file(tables_kobj,
 146                                                   &table_attr->attr);
 147                         if (result) {
 148                                 kfree(table_attr);
 149                                 return result;
 150                         } else
 151                                 list_add_tail(&table_attr->node,
 152                                               &acpi_table_attr_list);
 153                 }
 154         } while (!result);
 155         kobject_uevent(tables_kobj, KOBJ_ADD);
 156
 157         return 0;
 158 }
 159
 160 /*
 161  * Detailed ACPI IRQ counters in /sys/firmware/acpi/interrupts/
 162  * See Documentation/ABI/testing/sysfs-firmware-acpi
 163  */
 164
 165 #define COUNT_GPE 0
 166 #define COUNT_SCI 1     /* acpi_irq_handled */
 167 #define COUNT_ERROR 2   /* other */
 168 #define NUM_COUNTERS_EXTRA 3
 169
 170 #define ACPI_EVENT_VALID        0x01
 171 struct event_counter {
 172         u32 count;
 173         u32 flags;
 174 };
 175
 176 static struct event_counter *all_counters;
 177 static u32 num_gpes;
 178 static u32 num_counters;
 179 static struct attribute **all_attrs;
 180 static u32 acpi_gpe_count;
 181
 182 static struct attribute_group interrupt_stats_attr_group = {
 183         .name = "interrupts",
 184 };
 185 static struct kobj_attribute *counter_attrs;
 186
 187 static int count_num_gpes(void)
 188 {
 189         int count = 0;
 190         struct acpi_gpe_xrupt_info *gpe_xrupt_info;
 191         struct acpi_gpe_block_info *gpe_block;
 192         acpi_cpu_flags flags;
 193
 194         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 195
 196         gpe_xrupt_info = acpi_gbl_gpe_xrupt_list_head;
 197         while (gpe_xrupt_info) {
 198                 gpe_block = gpe_xrupt_info->gpe_block_list_head;
 199                 while (gpe_block) {
 200                         count += gpe_block->register_count *
 201                             ACPI_GPE_REGISTER_WIDTH;
 202                         gpe_block = gpe_block->next;
 203                 }
 204                 gpe_xrupt_info = gpe_xrupt_info->next;
 205         }
 206         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 207
 208         return count;
 209 }
 210
 211 static int get_gpe_device(int index, acpi_handle *handle)
 212 {
 213         struct acpi_gpe_xrupt_info *gpe_xrupt_info;
 214         struct acpi_gpe_block_info *gpe_block;
 215         acpi_cpu_flags flags;
 216         struct acpi_namespace_node *node;
 217
 218         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 219
 220         gpe_xrupt_info = acpi_gbl_gpe_xrupt_list_head;
 221         while (gpe_xrupt_info) {
 222                 gpe_block = gpe_xrupt_info->gpe_block_list_head;
 223                 node = gpe_block->node;
 224                 while (gpe_block) {
 225                         index -= gpe_block->register_count *
 226                             ACPI_GPE_REGISTER_WIDTH;
 227                         if (index < 0) {
 228                                 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 229                                 /* return NULL if it's FADT GPE */
 230                                 if (node->type != ACPI_TYPE_DEVICE)
 231                                         *handle = NULL;
 232                                 else
 233                                         *handle = node;
 234                                 return 0;
 235                         }
 236                         node = gpe_block->node;
 237                         gpe_block = gpe_block->next;
 238                 }
 239                 gpe_xrupt_info = gpe_xrupt_info->next;
 240         }
 241         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 242
 243         return -ENODEV;
 244 }
 245
 246 static void delete_gpe_attr_array(void)
 247 {
 248         struct event_counter *tmp = all_counters;
 249
 250         all_counters = NULL;
 251         kfree(tmp);
 252
 253         if (counter_attrs) {
 254                 int i;
 255
 256                 for (i = 0; i < num_gpes; i++)
 257                         kfree(counter_attrs[i].attr.name);
 258
 259                 kfree(counter_attrs);
 260         }
 261         kfree(all_attrs);
 262
 263         return;
 264 }
 265
 266 void acpi_os_gpe_count(u32 gpe_number)
 267 {
 268         acpi_gpe_count++;
 269
 270         if (!all_counters)
 271                 return;
 272
 273         if (gpe_number < num_gpes)
 274                 all_counters[gpe_number].count++;
 275         else
 276                 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR].
 277                                         count++;
 278
 279         return;
 280 }
 281
 282 void acpi_os_fixed_event_count(u32 event_number)
 283 {
 284         if (!all_counters)
 285                 return;
 286
 287         if (event_number < ACPI_NUM_FIXED_EVENTS)
 288                 all_counters[num_gpes + event_number].count++;
 289         else
 290                 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR].
 291                                 count++;
 292
 293         return;
 294 }
 295
 296 static int get_status(u32 index, acpi_event_status *status, acpi_handle *handle)
 297 {
 298         int result = 0;
 299
 300         if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
 301                 goto end;
 302
 303         if (index < num_gpes) {
 304                 result = get_gpe_device(index, handle);
 305                 if (result) {
 306                         ACPI_EXCEPTION((AE_INFO, AE_NOT_FOUND,
 307                                 "Invalid GPE 0x%x\n", index));
 308                         goto end;
 309                 }
 310                 result = acpi_get_gpe_status(*handle, index,
 311                                                 ACPI_NOT_ISR, status);
 312         } else if (index < (num_gpes + ACPI_NUM_FIXED_EVENTS))
 313                 result = acpi_get_event_status(index - num_gpes, status);
 314
 315         /*
 316          * sleep/power button GPE/Fixed Event is enabled after acpi_system_init,
 317          * check the status at runtime and mark it as valid once it's enabled
 318          */
 319         if (!result && (*status & ACPI_EVENT_FLAG_ENABLED))
 320                 all_counters[index].flags |= ACPI_EVENT_VALID;
 321 end:
 322         return result;
 323 }
 324
 325 static ssize_t counter_show(struct kobject *kobj,
 326         struct kobj_attribute *attr, char *buf)
 327 {
 328         int index = attr - counter_attrs;
 329         int size;
 330         acpi_handle handle;
 331         acpi_event_status status;
 332         int result = 0;
 333
 334         all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI].count =
 335                 acpi_irq_handled;
 336         all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE].count =
 337                 acpi_gpe_count;
 338
 339         size = sprintf(buf, "%8d", all_counters[index].count);
 340
 341         /* "gpe_all" or "sci" */
 342         if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
 343                 goto end;
 344
 345         result = get_status(index, &status, &handle);
 346         if (result)
 347                 goto end;
 348
 349         if (!(all_counters[index].flags & ACPI_EVENT_VALID))
 350                 size += sprintf(buf + size, "  invalid");
 351         else if (status & ACPI_EVENT_FLAG_ENABLED)
 352                 size += sprintf(buf + size, "   enable");
 353         else
 354                 size += sprintf(buf + size, "  disable");
 355
 356 end:
 357         size += sprintf(buf + size, "\n");
 358         return result ? result : size;
 359 }
 360
 361 /*
 362  * counter_set() sets the specified counter.
 363  * setting the total "sci" file to any value clears all counters.
 364  * enable/disable/clear a gpe/fixed event in user space.
 365  */
 366 static ssize_t counter_set(struct kobject *kobj,
 367         struct kobj_attribute *attr, const char *buf, size_t size)
 368 {
 369         int index = attr - counter_attrs;
 370         acpi_event_status status;
 371         acpi_handle handle;
 372         int result = 0;
 373
 374         if (index == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI) {
 375                 int i;
 376                 for (i = 0; i < num_counters; ++i)
 377                         all_counters[i].count = 0;
 378                 acpi_gpe_count = 0;
 379                 acpi_irq_handled = 0;
 380                 goto end;
 381         }
 382
 383         /* show the event status for both GPEs and Fixed Events */
 384         result = get_status(index, &status, &handle);
 385         if (result)
 386                 goto end;
 387
 388         if (!(all_counters[index].flags & ACPI_EVENT_VALID)) {
 389                 ACPI_DEBUG_PRINT((ACPI_DB_WARN,
 390                         "Can not change Invalid GPE/Fixed Event status\n"));
 391                 return -EINVAL;
 392         }
 393
 394         if (index < num_gpes) {
 395                 if (!strcmp(buf, "disable\n") &&
 396                                 (status & ACPI_EVENT_FLAG_ENABLED))
 397                         result = acpi_disable_gpe(handle, index, ACPI_NOT_ISR);
 398                 else if (!strcmp(buf, "enable\n") &&
 399                                 !(status & ACPI_EVENT_FLAG_ENABLED))
 400                         result = acpi_enable_gpe(handle, index, ACPI_NOT_ISR);
 401                 else if (!strcmp(buf, "clear\n") &&
 402                                 (status & ACPI_EVENT_FLAG_SET))
 403                         result = acpi_clear_gpe(handle, index, ACPI_NOT_ISR);
 404                 else
 405                         all_counters[index].count = strtoul(buf, NULL, 0);
 406         } else if (index < num_gpes + ACPI_NUM_FIXED_EVENTS) {
 407                 int event = index - num_gpes;
 408                 if (!strcmp(buf, "disable\n") &&
 409                                 (status & ACPI_EVENT_FLAG_ENABLED))
 410                         result = acpi_disable_event(event, ACPI_NOT_ISR);
 411                 else if (!strcmp(buf, "enable\n") &&
 412                                 !(status & ACPI_EVENT_FLAG_ENABLED))
 413                         result = acpi_enable_event(event, ACPI_NOT_ISR);
 414                 else if (!strcmp(buf, "clear\n") &&
 415                                 (status & ACPI_EVENT_FLAG_SET))
 416                         result = acpi_clear_event(event);
 417                 else
 418                         all_counters[index].count = strtoul(buf, NULL, 0);
 419         } else
 420                 all_counters[index].count = strtoul(buf, NULL, 0);
 421
 422         if (ACPI_FAILURE(result))
 423                 result = -EINVAL;
 424 end:
 425         return result ? result : size;
 426 }
 427
 428 void acpi_irq_stats_init(void)
 429 {
 430         int i;
 431
 432         if (all_counters)
 433                 return;
 434
 435         num_gpes = count_num_gpes();
 436         num_counters = num_gpes + ACPI_NUM_FIXED_EVENTS + NUM_COUNTERS_EXTRA;
 437
 438         all_attrs = kzalloc(sizeof(struct attribute *) * (num_counters + 1),
 439                         GFP_KERNEL);
 440         if (all_attrs == NULL)
 441                 return;
 442
 443         all_counters = kzalloc(sizeof(struct event_counter) * (num_counters),
 444                                 GFP_KERNEL);
 445         if (all_counters == NULL)
 446                 goto fail;
 447
 448         counter_attrs = kzalloc(sizeof(struct kobj_attribute) * (num_counters),
 449                         GFP_KERNEL);
 450         if (counter_attrs == NULL)
 451                 goto fail;
 452
 453         for (i = 0; i < num_counters; ++i) {
 454                 char buffer[12];
 455                 char *name;
 456
 457                 if (i < num_gpes)
 458                         sprintf(buffer, "gpe%02X", i);
 459                 else if (i == num_gpes + ACPI_EVENT_PMTIMER)
 460                         sprintf(buffer, "ff_pmtimer");
 461                 else if (i == num_gpes + ACPI_EVENT_GLOBAL)
 462                         sprintf(buffer, "ff_gbl_lock");
 463                 else if (i == num_gpes + ACPI_EVENT_POWER_BUTTON)
 464                         sprintf(buffer, "ff_pwr_btn");
 465                 else if (i == num_gpes + ACPI_EVENT_SLEEP_BUTTON)
 466                         sprintf(buffer, "ff_slp_btn");
 467                 else if (i == num_gpes + ACPI_EVENT_RTC)
 468                         sprintf(buffer, "ff_rt_clk");
 469                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE)
 470                         sprintf(buffer, "gpe_all");
 471                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI)
 472                         sprintf(buffer, "sci");
 473                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR)
 474                         sprintf(buffer, "error");
 475                 else
 476                         sprintf(buffer, "bug%02X", i);
 477
 478                 name = kzalloc(strlen(buffer) + 1, GFP_KERNEL);
 479                 if (name == NULL)
 480                         goto fail;
 481                 strncpy(name, buffer, strlen(buffer) + 1);
 482
 483                 counter_attrs[i].attr.name = name;
 484                 counter_attrs[i].attr.mode = 0644;
 485                 counter_attrs[i].show = counter_show;
 486                 counter_attrs[i].store = counter_set;
 487
 488                 all_attrs[i] = &counter_attrs[i].attr;
 489         }
 490
 491         interrupt_stats_attr_group.attrs = all_attrs;
 492         if (!sysfs_create_group(acpi_kobj, &interrupt_stats_attr_group))
 493                 return;
 494
 495 fail:
 496         delete_gpe_attr_array();
 497         return;
 498 }
 499
 500 static void __exit interrupt_stats_exit(void)
 501 {
 502         sysfs_remove_group(acpi_kobj, &interrupt_stats_attr_group);
 503
 504         delete_gpe_attr_array();
 505
 506         return;
 507 }
 508
 509 /* --------------------------------------------------------------------------
 510                               FS Interface (/proc)
 511    -------------------------------------------------------------------------- */
 512 #ifdef CONFIG_ACPI_PROCFS
 513 #define ACPI_SYSTEM_FILE_INFO           "info"
 514 #define ACPI_SYSTEM_FILE_EVENT          "event"
 515 #define ACPI_SYSTEM_FILE_DSDT           "dsdt"
 516 #define ACPI_SYSTEM_FILE_FADT           "fadt"
 517
 518 static int acpi_system_read_info(struct seq_file *seq, void *offset)
 519 {
 520
 521         seq_printf(seq, "version:                 %x\n", ACPI_CA_VERSION);
 522         return 0;
 523 }
 524
 525 static int acpi_system_info_open_fs(struct inode *inode, struct file *file)
 526 {
 527         return single_open(file, acpi_system_read_info, PDE(inode)->data);
 528 }
 529
 530 static const struct file_operations acpi_system_info_ops = {
 531         .owner = THIS_MODULE,
 532         .open = acpi_system_info_open_fs,
 533         .read = seq_read,
 534         .llseek = seq_lseek,
 535         .release = single_release,
 536 };
 537
 538 static ssize_t acpi_system_read_dsdt(struct file *, char __user *, size_t,
 539                                      loff_t *);
 540
 541 static const struct file_operations acpi_system_dsdt_ops = {
 542         .owner = THIS_MODULE,
 543         .read = acpi_system_read_dsdt,
 544 };
 545
 546 static ssize_t
 547 acpi_system_read_dsdt(struct file *file,
 548                       char __user * buffer, size_t count, loff_t * ppos)
 549 {
 550         acpi_status status = AE_OK;
 551         struct acpi_table_header *dsdt = NULL;
 552         ssize_t res;
 553
 554         status = acpi_get_table(ACPI_SIG_DSDT, 1, &dsdt);
 555         if (ACPI_FAILURE(status))
 556                 return -ENODEV;
 557
 558         res = simple_read_from_buffer(buffer, count, ppos, dsdt, dsdt->length);
 559
 560         return res;
 561 }
 562
 563 static ssize_t acpi_system_read_fadt(struct file *, char __user *, size_t,
 564                                      loff_t *);
 565
 566 static const struct file_operations acpi_system_fadt_ops = {
 567         .owner = THIS_MODULE,
 568         .read = acpi_system_read_fadt,
 569 };
 570
 571 static ssize_t
 572 acpi_system_read_fadt(struct file *file,
 573                       char __user * buffer, size_t count, loff_t * ppos)
 574 {
 575         acpi_status status = AE_OK;
 576         struct acpi_table_header *fadt = NULL;
 577         ssize_t res;
 578
 579         status = acpi_get_table(ACPI_SIG_FADT, 1, &fadt);
 580         if (ACPI_FAILURE(status))
 581                 return -ENODEV;
 582
 583         res = simple_read_from_buffer(buffer, count, ppos, fadt, fadt->length);
 584
 585         return res;
 586 }
 587
 588 static int acpi_system_procfs_init(void)
 589 {
 590         struct proc_dir_entry *entry;
 591         int error = 0;
 592
 593         /* 'info' [R] */
 594         entry = proc_create(ACPI_SYSTEM_FILE_INFO, S_IRUGO, acpi_root_dir,
 595                             &acpi_system_info_ops);
 596         if (!entry)
 597                 goto Error;
 598
 599         /* 'dsdt' [R] */
 600         entry = proc_create(ACPI_SYSTEM_FILE_DSDT, S_IRUSR, acpi_root_dir,
 601                             &acpi_system_dsdt_ops);
 602         if (!entry)
 603                 goto Error;
 604
 605         /* 'fadt' [R] */
 606         entry = proc_create(ACPI_SYSTEM_FILE_FADT, S_IRUSR, acpi_root_dir,
 607                             &acpi_system_fadt_ops);
 608         if (!entry)
 609                 goto Error;
 610
 611       Done:
 612         return error;
 613
 614       Error:
 615         remove_proc_entry(ACPI_SYSTEM_FILE_FADT, acpi_root_dir);
 616         remove_proc_entry(ACPI_SYSTEM_FILE_DSDT, acpi_root_dir);
 617         remove_proc_entry(ACPI_SYSTEM_FILE_INFO, acpi_root_dir);
 618
 619         error = -EFAULT;
 620         goto Done;
 621 }
 622 #else
 623 static int acpi_system_procfs_init(void)
 624 {
 625         return 0;
 626 }
 627 #endif
 628
 629 static int __init acpi_system_init(void)
 630 {
 631         int result = 0;
 632
 633         if (acpi_disabled)
 634                 return 0;
 635
 636         result = acpi_system_procfs_init();
 637         if (result)
 638                 return result;
 639
 640         result = acpi_system_sysfs_init();
 641
 642         return result;
 643 }
 644
 645 subsys_initcall(acpi_system_init);