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 <asm/uaccess.h>
  30
  31 #include <acpi/acpi_drivers.h>
  32
  33 #define _COMPONENT              ACPI_SYSTEM_COMPONENT
  34 ACPI_MODULE_NAME("system");
  35 #ifdef MODULE_PARAM_PREFIX
  36 #undef MODULE_PARAM_PREFIX
  37 #endif
  38 #define MODULE_PARAM_PREFIX "acpi."
  39
  40 #define ACPI_SYSTEM_CLASS               "system"
  41 #define ACPI_SYSTEM_DEVICE_NAME         "System"
  42
  43 u32 acpi_irq_handled;
  44
  45 /*
  46  * Make ACPICA version work as module param
  47  */
  48 static int param_get_acpica_version(char *buffer, struct kernel_param *kp)
  49 {
  50         int result;
  51
  52         result = sprintf(buffer, "%x", ACPI_CA_VERSION);
  53
  54         return result;
  55 }
  56
  57 module_param_call(acpica_version, NULL, param_get_acpica_version, NULL, 0444);
  58
  59 /* --------------------------------------------------------------------------
  60                               FS Interface (/sys)
  61    -------------------------------------------------------------------------- */
  62 static LIST_HEAD(acpi_table_attr_list);
  63 static struct kobject *tables_kobj;
  64
  65 struct acpi_table_attr {
  66         struct bin_attribute attr;
  67         char name[8];
  68         int instance;
  69         struct list_head node;
  70 };
  71
  72 static ssize_t acpi_table_show(struct kobject *kobj,
  73                                struct bin_attribute *bin_attr, char *buf,
  74                                loff_t offset, size_t count)
  75 {
  76         struct acpi_table_attr *table_attr =
  77             container_of(bin_attr, struct acpi_table_attr, attr);
  78         struct acpi_table_header *table_header = NULL;
  79         acpi_status status;
  80         ssize_t ret_count = count;
  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         if (offset >= table_header->length) {
  89                 ret_count = 0;
  90                 goto end;
  91         }
  92
  93         if (offset + ret_count > table_header->length)
  94                 ret_count = table_header->length - offset;
  95
  96         memcpy(buf, ((char *)table_header) + offset, ret_count);
  97
  98       end:
  99         return ret_count;
 100 }
 101
 102 static void acpi_table_attr_init(struct acpi_table_attr *table_attr,
 103                                  struct acpi_table_header *table_header)
 104 {
 105         struct acpi_table_header *header = NULL;
 106         struct acpi_table_attr *attr = NULL;
 107
 108         memcpy(table_attr->name, table_header->signature, ACPI_NAME_SIZE);
 109
 110         list_for_each_entry(attr, &acpi_table_attr_list, node) {
 111                 if (!memcmp(table_header->signature, attr->name,
 112                             ACPI_NAME_SIZE))
 113                         if (table_attr->instance < attr->instance)
 114                                 table_attr->instance = attr->instance;
 115         }
 116         table_attr->instance++;
 117
 118         if (table_attr->instance > 1 || (table_attr->instance == 1 &&
 119                                          !acpi_get_table(table_header->
 120                                                          signature, 2,
 121                                                          &header)))
 122                 sprintf(table_attr->name + 4, "%d", table_attr->instance);
 123
 124         table_attr->attr.size = 0;
 125         table_attr->attr.read = acpi_table_show;
 126         table_attr->attr.attr.name = table_attr->name;
 127         table_attr->attr.attr.mode = 0444;
 128         table_attr->attr.attr.owner = THIS_MODULE;
 129
 130         return;
 131 }
 132
 133 static int acpi_system_sysfs_init(void)
 134 {
 135         struct acpi_table_attr *table_attr;
 136         struct acpi_table_header *table_header = NULL;
 137         int table_index = 0;
 138         int result;
 139
 140         tables_kobj = kobject_create_and_add("tables", acpi_kobj);
 141         if (!tables_kobj)
 142                 return -ENOMEM;
 143
 144         do {
 145                 result = acpi_get_table_by_index(table_index, &table_header);
 146                 if (!result) {
 147                         table_index++;
 148                         table_attr = NULL;
 149                         table_attr =
 150                             kzalloc(sizeof(struct acpi_table_attr), GFP_KERNEL);
 151                         if (!table_attr)
 152                                 return -ENOMEM;
 153
 154                         acpi_table_attr_init(table_attr, table_header);
 155                         result =
 156                             sysfs_create_bin_file(tables_kobj,
 157                                                   &table_attr->attr);
 158                         if (result) {
 159                                 kfree(table_attr);
 160                                 return result;
 161                         } else
 162                                 list_add_tail(&table_attr->node,
 163                                               &acpi_table_attr_list);
 164                 }
 165         } while (!result);
 166         kobject_uevent(tables_kobj, KOBJ_ADD);
 167
 168         return 0;
 169 }
 170
 171 /*
 172  * Detailed ACPI IRQ counters in /sys/firmware/acpi/interrupts/
 173  * See Documentation/ABI/testing/sysfs-firmware-acpi
 174  */
 175
 176 #define COUNT_GPE 0
 177 #define COUNT_SCI 1     /* acpi_irq_handled */
 178 #define COUNT_ERROR 2   /* other */
 179 #define NUM_COUNTERS_EXTRA 3
 180
 181 static u32 *all_counters;
 182 static u32 num_gpes;
 183 static u32 num_counters;
 184 static struct attribute **all_attrs;
 185 static u32 acpi_gpe_count;
 186
 187 static struct attribute_group interrupt_stats_attr_group = {
 188         .name = "interrupts",
 189 };
 190 static struct kobj_attribute *counter_attrs;
 191
 192 static int count_num_gpes(void)
 193 {
 194         int count = 0;
 195         struct acpi_gpe_xrupt_info *gpe_xrupt_info;
 196         struct acpi_gpe_block_info *gpe_block;
 197         acpi_cpu_flags flags;
 198
 199         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 200
 201         gpe_xrupt_info = acpi_gbl_gpe_xrupt_list_head;
 202         while (gpe_xrupt_info) {
 203                 gpe_block = gpe_xrupt_info->gpe_block_list_head;
 204                 while (gpe_block) {
 205                         count += gpe_block->register_count *
 206                             ACPI_GPE_REGISTER_WIDTH;
 207                         gpe_block = gpe_block->next;
 208                 }
 209                 gpe_xrupt_info = gpe_xrupt_info->next;
 210         }
 211         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 212
 213         return count;
 214 }
 215
 216 static void delete_gpe_attr_array(void)
 217 {
 218         u32 *tmp = all_counters;
 219
 220         all_counters = NULL;
 221         kfree(tmp);
 222
 223         if (counter_attrs) {
 224                 int i;
 225
 226                 for (i = 0; i < num_gpes; i++)
 227                         kfree(counter_attrs[i].attr.name);
 228
 229                 kfree(counter_attrs);
 230         }
 231         kfree(all_attrs);
 232
 233         return;
 234 }
 235
 236 void acpi_os_gpe_count(u32 gpe_number)
 237 {
 238         acpi_gpe_count++;
 239
 240         if (!all_counters)
 241                 return;
 242
 243         if (gpe_number < num_gpes)
 244                 all_counters[gpe_number]++;
 245         else
 246                 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR]++;
 247
 248         return;
 249 }
 250
 251 void acpi_os_fixed_event_count(u32 event_number)
 252 {
 253         if (!all_counters)
 254                 return;
 255
 256         if (event_number < ACPI_NUM_FIXED_EVENTS)
 257                 all_counters[num_gpes + event_number]++;
 258         else
 259                 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR]++;
 260
 261         return;
 262 }
 263
 264 static ssize_t counter_show(struct kobject *kobj,
 265         struct kobj_attribute *attr, char *buf)
 266 {
 267         all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI] =
 268                 acpi_irq_handled;
 269         all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE] =
 270                 acpi_gpe_count;
 271
 272         return sprintf(buf, "%d\n", all_counters[attr - counter_attrs]);
 273 }
 274
 275 /*
 276  * counter_set() sets the specified counter.
 277  * setting the total "sci" file to any value clears all counters.
 278  */
 279 static ssize_t counter_set(struct kobject *kobj,
 280         struct kobj_attribute *attr, const char *buf, size_t size)
 281 {
 282         int index = attr - counter_attrs;
 283
 284         if (index == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI) {
 285                 int i;
 286                 for (i = 0; i < num_counters; ++i)
 287                         all_counters[i] = 0;
 288                 acpi_gpe_count = 0;
 289                 acpi_irq_handled = 0;
 290
 291         } else
 292                 all_counters[index] = strtoul(buf, NULL, 0);
 293
 294         return size;
 295 }
 296
 297 void acpi_irq_stats_init(void)
 298 {
 299         int i;
 300
 301         if (all_counters)
 302                 return;
 303
 304         num_gpes = count_num_gpes();
 305         num_counters = num_gpes + ACPI_NUM_FIXED_EVENTS + NUM_COUNTERS_EXTRA;
 306
 307         all_attrs = kzalloc(sizeof(struct attribute *) * (num_counters + 1),
 308                         GFP_KERNEL);
 309         if (all_attrs == NULL)
 310                 return;
 311
 312         all_counters = kzalloc(sizeof(u32) * (num_counters), GFP_KERNEL);
 313         if (all_counters == NULL)
 314                 goto fail;
 315
 316         counter_attrs = kzalloc(sizeof(struct kobj_attribute) * (num_counters),
 317                         GFP_KERNEL);
 318         if (counter_attrs == NULL)
 319                 goto fail;
 320
 321         for (i = 0; i < num_counters; ++i) {
 322                 char buffer[10];
 323                 char *name;
 324
 325                 if (i < num_gpes)
 326                         sprintf(buffer, "gpe%02X", i);
 327                 else if (i == num_gpes + ACPI_EVENT_PMTIMER)
 328                         sprintf(buffer, "ff_pmtimer");
 329                 else if (i == num_gpes + ACPI_EVENT_GLOBAL)
 330                         sprintf(buffer, "ff_gbl_lock");
 331                 else if (i == num_gpes + ACPI_EVENT_POWER_BUTTON)
 332                         sprintf(buffer, "ff_pwr_btn");
 333                 else if (i == num_gpes + ACPI_EVENT_SLEEP_BUTTON)
 334                         sprintf(buffer, "ff_slp_btn");
 335                 else if (i == num_gpes + ACPI_EVENT_RTC)
 336                         sprintf(buffer, "ff_rt_clk");
 337                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE)
 338                         sprintf(buffer, "gpe_all");
 339                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI)
 340                         sprintf(buffer, "sci");
 341                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR)
 342                         sprintf(buffer, "error");
 343                 else
 344                         sprintf(buffer, "bug%02X", i);
 345
 346                 name = kzalloc(strlen(buffer) + 1, GFP_KERNEL);
 347                 if (name == NULL)
 348                         goto fail;
 349                 strncpy(name, buffer, strlen(buffer) + 1);
 350
 351                 counter_attrs[i].attr.name = name;
 352                 counter_attrs[i].attr.mode = 0644;
 353                 counter_attrs[i].show = counter_show;
 354                 counter_attrs[i].store = counter_set;
 355
 356                 all_attrs[i] = &counter_attrs[i].attr;
 357         }
 358
 359         interrupt_stats_attr_group.attrs = all_attrs;
 360         sysfs_create_group(acpi_kobj, &interrupt_stats_attr_group);
 361         return;
 362
 363 fail:
 364         delete_gpe_attr_array();
 365         return;
 366 }
 367
 368 static void __exit interrupt_stats_exit(void)
 369 {
 370         sysfs_remove_group(acpi_kobj, &interrupt_stats_attr_group);
 371
 372         delete_gpe_attr_array();
 373
 374         return;
 375 }
 376
 377 /* --------------------------------------------------------------------------
 378                               FS Interface (/proc)
 379    -------------------------------------------------------------------------- */
 380 #ifdef CONFIG_ACPI_PROCFS
 381 #define ACPI_SYSTEM_FILE_INFO           "info"
 382 #define ACPI_SYSTEM_FILE_EVENT          "event"
 383 #define ACPI_SYSTEM_FILE_DSDT           "dsdt"
 384 #define ACPI_SYSTEM_FILE_FADT           "fadt"
 385
 386 static int acpi_system_read_info(struct seq_file *seq, void *offset)
 387 {
 388
 389         seq_printf(seq, "version:                 %x\n", ACPI_CA_VERSION);
 390         return 0;
 391 }
 392
 393 static int acpi_system_info_open_fs(struct inode *inode, struct file *file)
 394 {
 395         return single_open(file, acpi_system_read_info, PDE(inode)->data);
 396 }
 397
 398 static const struct file_operations acpi_system_info_ops = {
 399         .open = acpi_system_info_open_fs,
 400         .read = seq_read,
 401         .llseek = seq_lseek,
 402         .release = single_release,
 403 };
 404
 405 static ssize_t acpi_system_read_dsdt(struct file *, char __user *, size_t,
 406                                      loff_t *);
 407
 408 static const struct file_operations acpi_system_dsdt_ops = {
 409         .read = acpi_system_read_dsdt,
 410 };
 411
 412 static ssize_t
 413 acpi_system_read_dsdt(struct file *file,
 414                       char __user * buffer, size_t count, loff_t * ppos)
 415 {
 416         acpi_status status = AE_OK;
 417         struct acpi_table_header *dsdt = NULL;
 418         ssize_t res;
 419
 420         status = acpi_get_table(ACPI_SIG_DSDT, 1, &dsdt);
 421         if (ACPI_FAILURE(status))
 422                 return -ENODEV;
 423
 424         res = simple_read_from_buffer(buffer, count, ppos, dsdt, dsdt->length);
 425
 426         return res;
 427 }
 428
 429 static ssize_t acpi_system_read_fadt(struct file *, char __user *, size_t,
 430                                      loff_t *);
 431
 432 static const struct file_operations acpi_system_fadt_ops = {
 433         .read = acpi_system_read_fadt,
 434 };
 435
 436 static ssize_t
 437 acpi_system_read_fadt(struct file *file,
 438                       char __user * buffer, size_t count, loff_t * ppos)
 439 {
 440         acpi_status status = AE_OK;
 441         struct acpi_table_header *fadt = NULL;
 442         ssize_t res;
 443
 444         status = acpi_get_table(ACPI_SIG_FADT, 1, &fadt);
 445         if (ACPI_FAILURE(status))
 446                 return -ENODEV;
 447
 448         res = simple_read_from_buffer(buffer, count, ppos, fadt, fadt->length);
 449
 450         return res;
 451 }
 452
 453 static int acpi_system_procfs_init(void)
 454 {
 455         struct proc_dir_entry *entry;
 456         int error = 0;
 457         char *name;
 458
 459         /* 'info' [R] */
 460         name = ACPI_SYSTEM_FILE_INFO;
 461         entry = create_proc_entry(name, S_IRUGO, acpi_root_dir);
 462         if (!entry)
 463                 goto Error;
 464         else {
 465                 entry->proc_fops = &acpi_system_info_ops;
 466         }
 467
 468         /* 'dsdt' [R] */
 469         name = ACPI_SYSTEM_FILE_DSDT;
 470         entry = create_proc_entry(name, S_IRUSR, acpi_root_dir);
 471         if (entry)
 472                 entry->proc_fops = &acpi_system_dsdt_ops;
 473         else
 474                 goto Error;
 475
 476         /* 'fadt' [R] */
 477         name = ACPI_SYSTEM_FILE_FADT;
 478         entry = create_proc_entry(name, S_IRUSR, acpi_root_dir);
 479         if (entry)
 480                 entry->proc_fops = &acpi_system_fadt_ops;
 481         else
 482                 goto Error;
 483
 484       Done:
 485         return error;
 486
 487       Error:
 488         remove_proc_entry(ACPI_SYSTEM_FILE_FADT, acpi_root_dir);
 489         remove_proc_entry(ACPI_SYSTEM_FILE_DSDT, acpi_root_dir);
 490         remove_proc_entry(ACPI_SYSTEM_FILE_INFO, acpi_root_dir);
 491
 492         error = -EFAULT;
 493         goto Done;
 494 }
 495 #else
 496 static int acpi_system_procfs_init(void)
 497 {
 498         return 0;
 499 }
 500 #endif
 501
 502 static int __init acpi_system_init(void)
 503 {
 504         int result = 0;
 505
 506         if (acpi_disabled)
 507                 return 0;
 508
 509         result = acpi_system_procfs_init();
 510         if (result)
 511                 return result;
 512
 513         result = acpi_system_sysfs_init();
 514
 515         return result;
 516 }
 517
 518 subsys_initcall(acpi_system_init);