arch/ia64/kernel/salinfo.c

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This source file includes following definitions.
ARRAY_SIZE
salinfo_platform_oemdata_cpu
shift1_data_saved
salinfo_log_wakeup
salinfo_timeout_check
salinfo_timeout
salinfo_event_open
salinfo_event_read
salinfo_log_open
salinfo_log_release
salinfo_log_read_cpu
salinfo_log_new_read
salinfo_log_read
salinfo_log_clear_cpu
salinfo_log_clear
salinfo_log_write
salinfo_cpu_online
salinfo_cpu_pre_down
proc_salinfo_show
salinfo_init
   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * salinfo.c
   4  *
   5  * Creates entries in /proc/sal for various system features.
   6  *
   7  * Copyright (c) 2003, 2006 Silicon Graphics, Inc.  All rights reserved.
   8  * Copyright (c) 2003 Hewlett-Packard Co
   9  *      Bjorn Helgaas <bjorn.helgaas@hp.com>
  10  *
  11  * 10/30/2001   jbarnes@sgi.com         copied much of Stephane's palinfo
  12  *                                      code to create this file
  13  * Oct 23 2003  kaos@sgi.com
  14  *   Replace IPI with set_cpus_allowed() to read a record from the required cpu.
  15  *   Redesign salinfo log processing to separate interrupt and user space
  16  *   contexts.
  17  *   Cache the record across multi-block reads from user space.
  18  *   Support > 64 cpus.
  19  *   Delete module_exit and MOD_INC/DEC_COUNT, salinfo cannot be a module.
  20  *
  21  * Jan 28 2004  kaos@sgi.com
  22  *   Periodically check for outstanding MCA or INIT records.
  23  *
  24  * Dec  5 2004  kaos@sgi.com
  25  *   Standardize which records are cleared automatically.
  26  *
  27  * Aug 18 2005  kaos@sgi.com
  28  *   mca.c may not pass a buffer, a NULL buffer just indicates that a new
  29  *   record is available in SAL.
  30  *   Replace some NR_CPUS by cpus_online, for hotplug cpu.
  31  *
  32  * Jan  5 2006        kaos@sgi.com
  33  *   Handle hotplug cpus coming online.
  34  *   Handle hotplug cpus going offline while they still have outstanding records.
  35  *   Use the cpu_* macros consistently.
  36  *   Replace the counting semaphore with a mutex and a test if the cpumask is non-empty.
  37  *   Modify the locking to make the test for "work to do" an atomic operation.
  38  */
  39 
  40 #include <linux/capability.h>
  41 #include <linux/cpu.h>
  42 #include <linux/types.h>
  43 #include <linux/proc_fs.h>
  44 #include <linux/seq_file.h>
  45 #include <linux/module.h>
  46 #include <linux/smp.h>
  47 #include <linux/timer.h>
  48 #include <linux/vmalloc.h>
  49 #include <linux/semaphore.h>
  50 
  51 #include <asm/sal.h>
  52 #include <linux/uaccess.h>
  53 
  54 MODULE_AUTHOR("Jesse Barnes <jbarnes@sgi.com>");
  55 MODULE_DESCRIPTION("/proc interface to IA-64 SAL features");
  56 MODULE_LICENSE("GPL");
  57 
  58 typedef struct {
  59         const char              *name;          /* name of the proc entry */
  60         unsigned long           feature;        /* feature bit */
  61         struct proc_dir_entry   *entry;         /* registered entry (removal) */
  62 } salinfo_entry_t;
  63 
  64 /*
  65  * List {name,feature} pairs for every entry in /proc/sal/<feature>
  66  * that this module exports
  67  */
  68 static const salinfo_entry_t salinfo_entries[]={
  69         { "bus_lock",           IA64_SAL_PLATFORM_FEATURE_BUS_LOCK, },
  70         { "irq_redirection",    IA64_SAL_PLATFORM_FEATURE_IRQ_REDIR_HINT, },
  71         { "ipi_redirection",    IA64_SAL_PLATFORM_FEATURE_IPI_REDIR_HINT, },
  72         { "itc_drift",          IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT, },
  73 };
  74 
  75 #define NR_SALINFO_ENTRIES ARRAY_SIZE(salinfo_entries)
  76 
  77 static char *salinfo_log_name[] = {
  78         "mca",
  79         "init",
  80         "cmc",
  81         "cpe",
  82 };
  83 
  84 static struct proc_dir_entry *salinfo_proc_entries[
  85         ARRAY_SIZE(salinfo_entries) +                   /* /proc/sal/bus_lock */
  86         ARRAY_SIZE(salinfo_log_name) +                  /* /proc/sal/{mca,...} */
  87         (2 * ARRAY_SIZE(salinfo_log_name)) +            /* /proc/sal/mca/{event,data} */
  88         1];                                             /* /proc/sal */
  89 
  90 /* Some records we get ourselves, some are accessed as saved data in buffers
  91  * that are owned by mca.c.
  92  */
  93 struct salinfo_data_saved {
  94         u8*                     buffer;
  95         u64                     size;
  96         u64                     id;
  97         int                     cpu;
  98 };
  99 
 100 /* State transitions.  Actions are :-
 101  *   Write "read <cpunum>" to the data file.
 102  *   Write "clear <cpunum>" to the data file.
 103  *   Write "oemdata <cpunum> <offset> to the data file.
 104  *   Read from the data file.
 105  *   Close the data file.
 106  *
 107  * Start state is NO_DATA.
 108  *
 109  * NO_DATA
 110  *    write "read <cpunum>" -> NO_DATA or LOG_RECORD.
 111  *    write "clear <cpunum>" -> NO_DATA or LOG_RECORD.
 112  *    write "oemdata <cpunum> <offset> -> return -EINVAL.
 113  *    read data -> return EOF.
 114  *    close -> unchanged.  Free record areas.
 115  *
 116  * LOG_RECORD
 117  *    write "read <cpunum>" -> NO_DATA or LOG_RECORD.
 118  *    write "clear <cpunum>" -> NO_DATA or LOG_RECORD.
 119  *    write "oemdata <cpunum> <offset> -> format the oem data, goto OEMDATA.
 120  *    read data -> return the INIT/MCA/CMC/CPE record.
 121  *    close -> unchanged.  Keep record areas.
 122  *
 123  * OEMDATA
 124  *    write "read <cpunum>" -> NO_DATA or LOG_RECORD.
 125  *    write "clear <cpunum>" -> NO_DATA or LOG_RECORD.
 126  *    write "oemdata <cpunum> <offset> -> format the oem data, goto OEMDATA.
 127  *    read data -> return the formatted oemdata.
 128  *    close -> unchanged.  Keep record areas.
 129  *
 130  * Closing the data file does not change the state.  This allows shell scripts
 131  * to manipulate salinfo data, each shell redirection opens the file, does one
 132  * action then closes it again.  The record areas are only freed at close when
 133  * the state is NO_DATA.
 134  */
 135 enum salinfo_state {
 136         STATE_NO_DATA,
 137         STATE_LOG_RECORD,
 138         STATE_OEMDATA,
 139 };
 140 
 141 struct salinfo_data {
 142         cpumask_t               cpu_event;      /* which cpus have outstanding events */
 143         wait_queue_head_t       read_wait;
 144         u8                      *log_buffer;
 145         u64                     log_size;
 146         u8                      *oemdata;       /* decoded oem data */
 147         u64                     oemdata_size;
 148         int                     open;           /* single-open to prevent races */
 149         u8                      type;
 150         u8                      saved_num;      /* using a saved record? */
 151         enum salinfo_state      state :8;       /* processing state */
 152         u8                      padding;
 153         int                     cpu_check;      /* next CPU to check */
 154         struct salinfo_data_saved data_saved[5];/* save last 5 records from mca.c, must be < 255 */
 155 };
 156 
 157 static struct salinfo_data salinfo_data[ARRAY_SIZE(salinfo_log_name)];
 158 
 159 static DEFINE_SPINLOCK(data_lock);
 160 static DEFINE_SPINLOCK(data_saved_lock);
 161 
 162 /** salinfo_platform_oemdata - optional callback to decode oemdata from an error
 163  * record.
 164  * @sect_header: pointer to the start of the section to decode.
 165  * @oemdata: returns vmalloc area containing the decoded output.
 166  * @oemdata_size: returns length of decoded output (strlen).
 167  *
 168  * Description: If user space asks for oem data to be decoded by the kernel
 169  * and/or prom and the platform has set salinfo_platform_oemdata to the address
 170  * of a platform specific routine then call that routine.  salinfo_platform_oemdata
 171  * vmalloc's and formats its output area, returning the address of the text
 172  * and its strlen.  Returns 0 for success, -ve for error.  The callback is
 173  * invoked on the cpu that generated the error record.
 174  */
 175 int (*salinfo_platform_oemdata)(const u8 *sect_header, u8 **oemdata, u64 *oemdata_size);
 176 
 177 struct salinfo_platform_oemdata_parms {
 178         const u8 *efi_guid;
 179         u8 **oemdata;
 180         u64 *oemdata_size;
 181 };
 182 
 183 static long
 184 salinfo_platform_oemdata_cpu(void *context)
 185 {
 186         struct salinfo_platform_oemdata_parms *parms = context;
 187 
 188         return salinfo_platform_oemdata(parms->efi_guid, parms->oemdata, parms->oemdata_size);
 189 }
 190 
 191 static void
 192 shift1_data_saved (struct salinfo_data *data, int shift)
 193 {
 194         memcpy(data->data_saved+shift, data->data_saved+shift+1,
 195                (ARRAY_SIZE(data->data_saved) - (shift+1)) * sizeof(data->data_saved[0]));
 196         memset(data->data_saved + ARRAY_SIZE(data->data_saved) - 1, 0,
 197                sizeof(data->data_saved[0]));
 198 }
 199 
 200 /* This routine is invoked in interrupt context.  Note: mca.c enables
 201  * interrupts before calling this code for CMC/CPE.  MCA and INIT events are
 202  * not irq safe, do not call any routines that use spinlocks, they may deadlock.
 203  * MCA and INIT records are recorded, a timer event will look for any
 204  * outstanding events and wake up the user space code.
 205  *
 206  * The buffer passed from mca.c points to the output from ia64_log_get. This is
 207  * a persistent buffer but its contents can change between the interrupt and
 208  * when user space processes the record.  Save the record id to identify
 209  * changes.  If the buffer is NULL then just update the bitmap.
 210  */
 211 void
 212 salinfo_log_wakeup(int type, u8 *buffer, u64 size, int irqsafe)
 213 {
 214         struct salinfo_data *data = salinfo_data + type;
 215         struct salinfo_data_saved *data_saved;
 216         unsigned long flags = 0;
 217         int i;
 218         int saved_size = ARRAY_SIZE(data->data_saved);
 219 
 220         BUG_ON(type >= ARRAY_SIZE(salinfo_log_name));
 221 
 222         if (irqsafe)
 223                 spin_lock_irqsave(&data_saved_lock, flags);
 224         if (buffer) {
 225                 for (i = 0, data_saved = data->data_saved; i < saved_size; ++i, ++data_saved) {
 226                         if (!data_saved->buffer)
 227                                 break;
 228                 }
 229                 if (i == saved_size) {
 230                         if (!data->saved_num) {
 231                                 shift1_data_saved(data, 0);
 232                                 data_saved = data->data_saved + saved_size - 1;
 233                         } else
 234                                 data_saved = NULL;
 235                 }
 236                 if (data_saved) {
 237                         data_saved->cpu = smp_processor_id();
 238                         data_saved->id = ((sal_log_record_header_t *)buffer)->id;
 239                         data_saved->size = size;
 240                         data_saved->buffer = buffer;
 241                 }
 242         }
 243         cpumask_set_cpu(smp_processor_id(), &data->cpu_event);
 244         if (irqsafe) {
 245                 wake_up_interruptible(&data->read_wait);
 246                 spin_unlock_irqrestore(&data_saved_lock, flags);
 247         }
 248 }
 249 
 250 /* Check for outstanding MCA/INIT records every minute (arbitrary) */
 251 #define SALINFO_TIMER_DELAY (60*HZ)
 252 static struct timer_list salinfo_timer;
 253 extern void ia64_mlogbuf_dump(void);
 254 
 255 static void
 256 salinfo_timeout_check(struct salinfo_data *data)
 257 {
 258         if (!data->open)
 259                 return;
 260         if (!cpumask_empty(&data->cpu_event))
 261                 wake_up_interruptible(&data->read_wait);
 262 }
 263 
 264 static void
 265 salinfo_timeout(struct timer_list *unused)
 266 {
 267         ia64_mlogbuf_dump();
 268         salinfo_timeout_check(salinfo_data + SAL_INFO_TYPE_MCA);
 269         salinfo_timeout_check(salinfo_data + SAL_INFO_TYPE_INIT);
 270         salinfo_timer.expires = jiffies + SALINFO_TIMER_DELAY;
 271         add_timer(&salinfo_timer);
 272 }
 273 
 274 static int
 275 salinfo_event_open(struct inode *inode, struct file *file)
 276 {
 277         if (!capable(CAP_SYS_ADMIN))
 278                 return -EPERM;
 279         return 0;
 280 }
 281 
 282 static ssize_t
 283 salinfo_event_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
 284 {
 285         struct salinfo_data *data = PDE_DATA(file_inode(file));
 286         char cmd[32];
 287         size_t size;
 288         int i, n, cpu = -1;
 289 
 290 retry:
 291         if (cpumask_empty(&data->cpu_event)) {
 292                 if (file->f_flags & O_NONBLOCK)
 293                         return -EAGAIN;
 294                 if (wait_event_interruptible(data->read_wait,
 295                                              !cpumask_empty(&data->cpu_event)))
 296                         return -EINTR;
 297         }
 298 
 299         n = data->cpu_check;
 300         for (i = 0; i < nr_cpu_ids; i++) {
 301                 if (cpumask_test_cpu(n, &data->cpu_event)) {
 302                         if (!cpu_online(n)) {
 303                                 cpumask_clear_cpu(n, &data->cpu_event);
 304                                 continue;
 305                         }
 306                         cpu = n;
 307                         break;
 308                 }
 309                 if (++n == nr_cpu_ids)
 310                         n = 0;
 311         }
 312 
 313         if (cpu == -1)
 314                 goto retry;
 315 
 316         ia64_mlogbuf_dump();
 317 
 318         /* for next read, start checking at next CPU */
 319         data->cpu_check = cpu;
 320         if (++data->cpu_check == nr_cpu_ids)
 321                 data->cpu_check = 0;
 322 
 323         snprintf(cmd, sizeof(cmd), "read %d\n", cpu);
 324 
 325         size = strlen(cmd);
 326         if (size > count)
 327                 size = count;
 328         if (copy_to_user(buffer, cmd, size))
 329                 return -EFAULT;
 330 
 331         return size;
 332 }
 333 
 334 static const struct file_operations salinfo_event_fops = {
 335         .open  = salinfo_event_open,
 336         .read  = salinfo_event_read,
 337         .llseek = noop_llseek,
 338 };
 339 
 340 static int
 341 salinfo_log_open(struct inode *inode, struct file *file)
 342 {
 343         struct salinfo_data *data = PDE_DATA(inode);
 344 
 345         if (!capable(CAP_SYS_ADMIN))
 346                 return -EPERM;
 347 
 348         spin_lock(&data_lock);
 349         if (data->open) {
 350                 spin_unlock(&data_lock);
 351                 return -EBUSY;
 352         }
 353         data->open = 1;
 354         spin_unlock(&data_lock);
 355 
 356         if (data->state == STATE_NO_DATA &&
 357             !(data->log_buffer = vmalloc(ia64_sal_get_state_info_size(data->type)))) {
 358                 data->open = 0;
 359                 return -ENOMEM;
 360         }
 361 
 362         return 0;
 363 }
 364 
 365 static int
 366 salinfo_log_release(struct inode *inode, struct file *file)
 367 {
 368         struct salinfo_data *data = PDE_DATA(inode);
 369 
 370         if (data->state == STATE_NO_DATA) {
 371                 vfree(data->log_buffer);
 372                 vfree(data->oemdata);
 373                 data->log_buffer = NULL;
 374                 data->oemdata = NULL;
 375         }
 376         spin_lock(&data_lock);
 377         data->open = 0;
 378         spin_unlock(&data_lock);
 379         return 0;
 380 }
 381 
 382 static long
 383 salinfo_log_read_cpu(void *context)
 384 {
 385         struct salinfo_data *data = context;
 386         sal_log_record_header_t *rh;
 387         data->log_size = ia64_sal_get_state_info(data->type, (u64 *) data->log_buffer);
 388         rh = (sal_log_record_header_t *)(data->log_buffer);
 389         /* Clear corrected errors as they are read from SAL */
 390         if (rh->severity == sal_log_severity_corrected)
 391                 ia64_sal_clear_state_info(data->type);
 392         return 0;
 393 }
 394 
 395 static void
 396 salinfo_log_new_read(int cpu, struct salinfo_data *data)
 397 {
 398         struct salinfo_data_saved *data_saved;
 399         unsigned long flags;
 400         int i;
 401         int saved_size = ARRAY_SIZE(data->data_saved);
 402 
 403         data->saved_num = 0;
 404         spin_lock_irqsave(&data_saved_lock, flags);
 405 retry:
 406         for (i = 0, data_saved = data->data_saved; i < saved_size; ++i, ++data_saved) {
 407                 if (data_saved->buffer && data_saved->cpu == cpu) {
 408                         sal_log_record_header_t *rh = (sal_log_record_header_t *)(data_saved->buffer);
 409                         data->log_size = data_saved->size;
 410                         memcpy(data->log_buffer, rh, data->log_size);
 411                         barrier();      /* id check must not be moved */
 412                         if (rh->id == data_saved->id) {
 413                                 data->saved_num = i+1;
 414                                 break;
 415                         }
 416                         /* saved record changed by mca.c since interrupt, discard it */
 417                         shift1_data_saved(data, i);
 418                         goto retry;
 419                 }
 420         }
 421         spin_unlock_irqrestore(&data_saved_lock, flags);
 422 
 423         if (!data->saved_num)
 424                 work_on_cpu_safe(cpu, salinfo_log_read_cpu, data);
 425         if (!data->log_size) {
 426                 data->state = STATE_NO_DATA;
 427                 cpumask_clear_cpu(cpu, &data->cpu_event);
 428         } else {
 429                 data->state = STATE_LOG_RECORD;
 430         }
 431 }
 432 
 433 static ssize_t
 434 salinfo_log_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
 435 {
 436         struct salinfo_data *data = PDE_DATA(file_inode(file));
 437         u8 *buf;
 438         u64 bufsize;
 439 
 440         if (data->state == STATE_LOG_RECORD) {
 441                 buf = data->log_buffer;
 442                 bufsize = data->log_size;
 443         } else if (data->state == STATE_OEMDATA) {
 444                 buf = data->oemdata;
 445                 bufsize = data->oemdata_size;
 446         } else {
 447                 buf = NULL;
 448                 bufsize = 0;
 449         }
 450         return simple_read_from_buffer(buffer, count, ppos, buf, bufsize);
 451 }
 452 
 453 static long
 454 salinfo_log_clear_cpu(void *context)
 455 {
 456         struct salinfo_data *data = context;
 457 
 458         ia64_sal_clear_state_info(data->type);
 459         return 0;
 460 }
 461 
 462 static int
 463 salinfo_log_clear(struct salinfo_data *data, int cpu)
 464 {
 465         sal_log_record_header_t *rh;
 466         unsigned long flags;
 467         spin_lock_irqsave(&data_saved_lock, flags);
 468         data->state = STATE_NO_DATA;
 469         if (!cpumask_test_cpu(cpu, &data->cpu_event)) {
 470                 spin_unlock_irqrestore(&data_saved_lock, flags);
 471                 return 0;
 472         }
 473         cpumask_clear_cpu(cpu, &data->cpu_event);
 474         if (data->saved_num) {
 475                 shift1_data_saved(data, data->saved_num - 1);
 476                 data->saved_num = 0;
 477         }
 478         spin_unlock_irqrestore(&data_saved_lock, flags);
 479         rh = (sal_log_record_header_t *)(data->log_buffer);
 480         /* Corrected errors have already been cleared from SAL */
 481         if (rh->severity != sal_log_severity_corrected)
 482                 work_on_cpu_safe(cpu, salinfo_log_clear_cpu, data);
 483         /* clearing a record may make a new record visible */
 484         salinfo_log_new_read(cpu, data);
 485         if (data->state == STATE_LOG_RECORD) {
 486                 spin_lock_irqsave(&data_saved_lock, flags);
 487                 cpumask_set_cpu(cpu, &data->cpu_event);
 488                 wake_up_interruptible(&data->read_wait);
 489                 spin_unlock_irqrestore(&data_saved_lock, flags);
 490         }
 491         return 0;
 492 }
 493 
 494 static ssize_t
 495 salinfo_log_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
 496 {
 497         struct salinfo_data *data = PDE_DATA(file_inode(file));
 498         char cmd[32];
 499         size_t size;
 500         u32 offset;
 501         int cpu;
 502 
 503         size = sizeof(cmd);
 504         if (count < size)
 505                 size = count;
 506         if (copy_from_user(cmd, buffer, size))
 507                 return -EFAULT;
 508 
 509         if (sscanf(cmd, "read %d", &cpu) == 1) {
 510                 salinfo_log_new_read(cpu, data);
 511         } else if (sscanf(cmd, "clear %d", &cpu) == 1) {
 512                 int ret;
 513                 if ((ret = salinfo_log_clear(data, cpu)))
 514                         count = ret;
 515         } else if (sscanf(cmd, "oemdata %d %d", &cpu, &offset) == 2) {
 516                 if (data->state != STATE_LOG_RECORD && data->state != STATE_OEMDATA)
 517                         return -EINVAL;
 518                 if (offset > data->log_size - sizeof(efi_guid_t))
 519                         return -EINVAL;
 520                 data->state = STATE_OEMDATA;
 521                 if (salinfo_platform_oemdata) {
 522                         struct salinfo_platform_oemdata_parms parms = {
 523                                 .efi_guid = data->log_buffer + offset,
 524                                 .oemdata = &data->oemdata,
 525                                 .oemdata_size = &data->oemdata_size
 526                         };
 527                         count = work_on_cpu_safe(cpu, salinfo_platform_oemdata_cpu,
 528                                                  &parms);
 529                 } else
 530                         data->oemdata_size = 0;
 531         } else
 532                 return -EINVAL;
 533 
 534         return count;
 535 }
 536 
 537 static const struct file_operations salinfo_data_fops = {
 538         .open    = salinfo_log_open,
 539         .release = salinfo_log_release,
 540         .read    = salinfo_log_read,
 541         .write   = salinfo_log_write,
 542         .llseek  = default_llseek,
 543 };
 544 
 545 static int salinfo_cpu_online(unsigned int cpu)
 546 {
 547         unsigned int i, end = ARRAY_SIZE(salinfo_data);
 548         struct salinfo_data *data;
 549 
 550         spin_lock_irq(&data_saved_lock);
 551         for (i = 0, data = salinfo_data; i < end; ++i, ++data) {
 552                 cpumask_set_cpu(cpu, &data->cpu_event);
 553                 wake_up_interruptible(&data->read_wait);
 554         }
 555         spin_unlock_irq(&data_saved_lock);
 556         return 0;
 557 }
 558 
 559 static int salinfo_cpu_pre_down(unsigned int cpu)
 560 {
 561         unsigned int i, end = ARRAY_SIZE(salinfo_data);
 562         struct salinfo_data *data;
 563 
 564         spin_lock_irq(&data_saved_lock);
 565         for (i = 0, data = salinfo_data; i < end; ++i, ++data) {
 566                 struct salinfo_data_saved *data_saved;
 567                 int j = ARRAY_SIZE(data->data_saved) - 1;
 568 
 569                 for (data_saved = data->data_saved + j; j >= 0;
 570                      --j, --data_saved) {
 571                         if (data_saved->buffer && data_saved->cpu == cpu)
 572                                 shift1_data_saved(data, j);
 573                 }
 574                 cpumask_clear_cpu(cpu, &data->cpu_event);
 575         }
 576         spin_unlock_irq(&data_saved_lock);
 577         return 0;
 578 }
 579 
 580 /*
 581  * 'data' contains an integer that corresponds to the feature we're
 582  * testing
 583  */
 584 static int proc_salinfo_show(struct seq_file *m, void *v)
 585 {
 586         unsigned long data = (unsigned long)v;
 587         seq_puts(m, (sal_platform_features & data) ? "1\n" : "0\n");
 588         return 0;
 589 }
 590 
 591 static int __init
 592 salinfo_init(void)
 593 {
 594         struct proc_dir_entry *salinfo_dir; /* /proc/sal dir entry */
 595         struct proc_dir_entry **sdir = salinfo_proc_entries; /* keeps track of every entry */
 596         struct proc_dir_entry *dir, *entry;
 597         struct salinfo_data *data;
 598         int i;
 599 
 600         salinfo_dir = proc_mkdir("sal", NULL);
 601         if (!salinfo_dir)
 602                 return 0;
 603 
 604         for (i=0; i < NR_SALINFO_ENTRIES; i++) {
 605                 /* pass the feature bit in question as misc data */
 606                 *sdir++ = proc_create_single_data(salinfo_entries[i].name, 0,
 607                                 salinfo_dir, proc_salinfo_show,
 608                                 (void *)salinfo_entries[i].feature);
 609         }
 610 
 611         for (i = 0; i < ARRAY_SIZE(salinfo_log_name); i++) {
 612                 data = salinfo_data + i;
 613                 data->type = i;
 614                 init_waitqueue_head(&data->read_wait);
 615                 dir = proc_mkdir(salinfo_log_name[i], salinfo_dir);
 616                 if (!dir)
 617                         continue;
 618 
 619                 entry = proc_create_data("event", S_IRUSR, dir,
 620                                          &salinfo_event_fops, data);
 621                 if (!entry)
 622                         continue;
 623                 *sdir++ = entry;
 624 
 625                 entry = proc_create_data("data", S_IRUSR | S_IWUSR, dir,
 626                                          &salinfo_data_fops, data);
 627                 if (!entry)
 628                         continue;
 629                 *sdir++ = entry;
 630 
 631                 *sdir++ = dir;
 632         }
 633 
 634         *sdir++ = salinfo_dir;
 635 
 636         timer_setup(&salinfo_timer, salinfo_timeout, 0);
 637         salinfo_timer.expires = jiffies + SALINFO_TIMER_DELAY;
 638         add_timer(&salinfo_timer);
 639 
 640         i = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "ia64/salinfo:online",
 641                               salinfo_cpu_online, salinfo_cpu_pre_down);
 642         WARN_ON(i < 0);
 643         return 0;
 644 }
 645 
 646 module_init(salinfo_init);
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root/arch/ia64/kernel/salinfo.c

DEFINITIONS
