linux/arch/ia64/kernel/salinfo.c
<<
>>
Prefs
   1/*
   2 * salinfo.c
   3 *
   4 * Creates entries in /proc/sal for various system features.
   5 *
   6 * Copyright (c) 2003, 2006 Silicon Graphics, Inc.  All rights reserved.
   7 * Copyright (c) 2003 Hewlett-Packard Co
   8 *      Bjorn Helgaas <bjorn.helgaas@hp.com>
   9 *
  10 * 10/30/2001   jbarnes@sgi.com         copied much of Stephane's palinfo
  11 *                                      code to create this file
  12 * Oct 23 2003  kaos@sgi.com
  13 *   Replace IPI with set_cpus_allowed() to read a record from the required cpu.
  14 *   Redesign salinfo log processing to separate interrupt and user space
  15 *   contexts.
  16 *   Cache the record across multi-block reads from user space.
  17 *   Support > 64 cpus.
  18 *   Delete module_exit and MOD_INC/DEC_COUNT, salinfo cannot be a module.
  19 *
  20 * Jan 28 2004  kaos@sgi.com
  21 *   Periodically check for outstanding MCA or INIT records.
  22 *
  23 * Dec  5 2004  kaos@sgi.com
  24 *   Standardize which records are cleared automatically.
  25 *
  26 * Aug 18 2005  kaos@sgi.com
  27 *   mca.c may not pass a buffer, a NULL buffer just indicates that a new
  28 *   record is available in SAL.
  29 *   Replace some NR_CPUS by cpus_online, for hotplug cpu.
  30 *
  31 * Jan  5 2006        kaos@sgi.com
  32 *   Handle hotplug cpus coming online.
  33 *   Handle hotplug cpus going offline while they still have outstanding records.
  34 *   Use the cpu_* macros consistently.
  35 *   Replace the counting semaphore with a mutex and a test if the cpumask is non-empty.
  36 *   Modify the locking to make the test for "work to do" an atomic operation.
  37 */
  38
  39#include <linux/capability.h>
  40#include <linux/cpu.h>
  41#include <linux/types.h>
  42#include <linux/proc_fs.h>
  43#include <linux/seq_file.h>
  44#include <linux/module.h>
  45#include <linux/smp.h>
  46#include <linux/timer.h>
  47#include <linux/vmalloc.h>
  48#include <linux/semaphore.h>
  49
  50#include <asm/sal.h>
  51#include <linux/uaccess.h>
  52
  53MODULE_AUTHOR("Jesse Barnes <jbarnes@sgi.com>");
  54MODULE_DESCRIPTION("/proc interface to IA-64 SAL features");
  55MODULE_LICENSE("GPL");
  56
  57static const struct file_operations proc_salinfo_fops;
  58
  59typedef struct {
  60        const char              *name;          /* name of the proc entry */
  61        unsigned long           feature;        /* feature bit */
  62        struct proc_dir_entry   *entry;         /* registered entry (removal) */
  63} salinfo_entry_t;
  64
  65/*
  66 * List {name,feature} pairs for every entry in /proc/sal/<feature>
  67 * that this module exports
  68 */
  69static const salinfo_entry_t salinfo_entries[]={
  70        { "bus_lock",           IA64_SAL_PLATFORM_FEATURE_BUS_LOCK, },
  71        { "irq_redirection",    IA64_SAL_PLATFORM_FEATURE_IRQ_REDIR_HINT, },
  72        { "ipi_redirection",    IA64_SAL_PLATFORM_FEATURE_IPI_REDIR_HINT, },
  73        { "itc_drift",          IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT, },
  74};
  75
  76#define NR_SALINFO_ENTRIES ARRAY_SIZE(salinfo_entries)
  77
  78static char *salinfo_log_name[] = {
  79        "mca",
  80        "init",
  81        "cmc",
  82        "cpe",
  83};
  84
  85static struct proc_dir_entry *salinfo_proc_entries[
  86        ARRAY_SIZE(salinfo_entries) +                   /* /proc/sal/bus_lock */
  87        ARRAY_SIZE(salinfo_log_name) +                  /* /proc/sal/{mca,...} */
  88        (2 * ARRAY_SIZE(salinfo_log_name)) +            /* /proc/sal/mca/{event,data} */
  89        1];                                             /* /proc/sal */
  90
  91/* Some records we get ourselves, some are accessed as saved data in buffers
  92 * that are owned by mca.c.
  93 */
  94struct salinfo_data_saved {
  95        u8*                     buffer;
  96        u64                     size;
  97        u64                     id;
  98        int                     cpu;
  99};
 100
 101/* State transitions.  Actions are :-
 102 *   Write "read <cpunum>" to the data file.
 103 *   Write "clear <cpunum>" to the data file.
 104 *   Write "oemdata <cpunum> <offset> to the data file.
 105 *   Read from the data file.
 106 *   Close the data file.
 107 *
 108 * Start state is NO_DATA.
 109 *
 110 * NO_DATA
 111 *    write "read <cpunum>" -> NO_DATA or LOG_RECORD.
 112 *    write "clear <cpunum>" -> NO_DATA or LOG_RECORD.
 113 *    write "oemdata <cpunum> <offset> -> return -EINVAL.
 114 *    read data -> return EOF.
 115 *    close -> unchanged.  Free record areas.
 116 *
 117 * LOG_RECORD
 118 *    write "read <cpunum>" -> NO_DATA or LOG_RECORD.
 119 *    write "clear <cpunum>" -> NO_DATA or LOG_RECORD.
 120 *    write "oemdata <cpunum> <offset> -> format the oem data, goto OEMDATA.
 121 *    read data -> return the INIT/MCA/CMC/CPE record.
 122 *    close -> unchanged.  Keep record areas.
 123 *
 124 * OEMDATA
 125 *    write "read <cpunum>" -> NO_DATA or LOG_RECORD.
 126 *    write "clear <cpunum>" -> NO_DATA or LOG_RECORD.
 127 *    write "oemdata <cpunum> <offset> -> format the oem data, goto OEMDATA.
 128 *    read data -> return the formatted oemdata.
 129 *    close -> unchanged.  Keep record areas.
 130 *
 131 * Closing the data file does not change the state.  This allows shell scripts
 132 * to manipulate salinfo data, each shell redirection opens the file, does one
 133 * action then closes it again.  The record areas are only freed at close when
 134 * the state is NO_DATA.
 135 */
 136enum salinfo_state {
 137        STATE_NO_DATA,
 138        STATE_LOG_RECORD,
 139        STATE_OEMDATA,
 140};
 141
 142struct salinfo_data {
 143        cpumask_t               cpu_event;      /* which cpus have outstanding events */
 144        wait_queue_head_t       read_wait;
 145        u8                      *log_buffer;
 146        u64                     log_size;
 147        u8                      *oemdata;       /* decoded oem data */
 148        u64                     oemdata_size;
 149        int                     open;           /* single-open to prevent races */
 150        u8                      type;
 151        u8                      saved_num;      /* using a saved record? */
 152        enum salinfo_state      state :8;       /* processing state */
 153        u8                      padding;
 154        int                     cpu_check;      /* next CPU to check */
 155        struct salinfo_data_saved data_saved[5];/* save last 5 records from mca.c, must be < 255 */
 156};
 157
 158static struct salinfo_data salinfo_data[ARRAY_SIZE(salinfo_log_name)];
 159
 160static DEFINE_SPINLOCK(data_lock);
 161static DEFINE_SPINLOCK(data_saved_lock);
 162
 163/** salinfo_platform_oemdata - optional callback to decode oemdata from an error
 164 * record.
 165 * @sect_header: pointer to the start of the section to decode.
 166 * @oemdata: returns vmalloc area containing the decoded output.
 167 * @oemdata_size: returns length of decoded output (strlen).
 168 *
 169 * Description: If user space asks for oem data to be decoded by the kernel
 170 * and/or prom and the platform has set salinfo_platform_oemdata to the address
 171 * of a platform specific routine then call that routine.  salinfo_platform_oemdata
 172 * vmalloc's and formats its output area, returning the address of the text
 173 * and its strlen.  Returns 0 for success, -ve for error.  The callback is
 174 * invoked on the cpu that generated the error record.
 175 */
 176int (*salinfo_platform_oemdata)(const u8 *sect_header, u8 **oemdata, u64 *oemdata_size);
 177
 178struct salinfo_platform_oemdata_parms {
 179        const u8 *efi_guid;
 180        u8 **oemdata;
 181        u64 *oemdata_size;
 182};
 183
 184static long
 185salinfo_platform_oemdata_cpu(void *context)
 186{
 187        struct salinfo_platform_oemdata_parms *parms = context;
 188
 189        return salinfo_platform_oemdata(parms->efi_guid, parms->oemdata, parms->oemdata_size);
 190}
 191
 192static void
 193shift1_data_saved (struct salinfo_data *data, int shift)
 194{
 195        memcpy(data->data_saved+shift, data->data_saved+shift+1,
 196               (ARRAY_SIZE(data->data_saved) - (shift+1)) * sizeof(data->data_saved[0]));
 197        memset(data->data_saved + ARRAY_SIZE(data->data_saved) - 1, 0,
 198               sizeof(data->data_saved[0]));
 199}
 200
 201/* This routine is invoked in interrupt context.  Note: mca.c enables
 202 * interrupts before calling this code for CMC/CPE.  MCA and INIT events are
 203 * not irq safe, do not call any routines that use spinlocks, they may deadlock.
 204 * MCA and INIT records are recorded, a timer event will look for any
 205 * outstanding events and wake up the user space code.
 206 *
 207 * The buffer passed from mca.c points to the output from ia64_log_get. This is
 208 * a persistent buffer but its contents can change between the interrupt and
 209 * when user space processes the record.  Save the record id to identify
 210 * changes.  If the buffer is NULL then just update the bitmap.
 211 */
 212void
 213salinfo_log_wakeup(int type, u8 *buffer, u64 size, int irqsafe)
 214{
 215        struct salinfo_data *data = salinfo_data + type;
 216        struct salinfo_data_saved *data_saved;
 217        unsigned long flags = 0;
 218        int i;
 219        int saved_size = ARRAY_SIZE(data->data_saved);
 220
 221        BUG_ON(type >= ARRAY_SIZE(salinfo_log_name));
 222
 223        if (irqsafe)
 224                spin_lock_irqsave(&data_saved_lock, flags);
 225        if (buffer) {
 226                for (i = 0, data_saved = data->data_saved; i < saved_size; ++i, ++data_saved) {
 227                        if (!data_saved->buffer)
 228                                break;
 229                }
 230                if (i == saved_size) {
 231                        if (!data->saved_num) {
 232                                shift1_data_saved(data, 0);
 233                                data_saved = data->data_saved + saved_size - 1;
 234                        } else
 235                                data_saved = NULL;
 236                }
 237                if (data_saved) {
 238                        data_saved->cpu = smp_processor_id();
 239                        data_saved->id = ((sal_log_record_header_t *)buffer)->id;
 240                        data_saved->size = size;
 241                        data_saved->buffer = buffer;
 242                }
 243        }
 244        cpumask_set_cpu(smp_processor_id(), &data->cpu_event);
 245        if (irqsafe) {
 246                wake_up_interruptible(&data->read_wait);
 247                spin_unlock_irqrestore(&data_saved_lock, flags);
 248        }
 249}
 250
 251/* Check for outstanding MCA/INIT records every minute (arbitrary) */
 252#define SALINFO_TIMER_DELAY (60*HZ)
 253static struct timer_list salinfo_timer;
 254extern void ia64_mlogbuf_dump(void);
 255
 256static void
 257salinfo_timeout_check(struct salinfo_data *data)
 258{
 259        if (!data->open)
 260                return;
 261        if (!cpumask_empty(&data->cpu_event))
 262                wake_up_interruptible(&data->read_wait);
 263}
 264
 265static void
 266salinfo_timeout (unsigned long arg)
 267{
 268        ia64_mlogbuf_dump();
 269        salinfo_timeout_check(salinfo_data + SAL_INFO_TYPE_MCA);
 270        salinfo_timeout_check(salinfo_data + SAL_INFO_TYPE_INIT);
 271        salinfo_timer.expires = jiffies + SALINFO_TIMER_DELAY;
 272        add_timer(&salinfo_timer);
 273}
 274
 275static int
 276salinfo_event_open(struct inode *inode, struct file *file)
 277{
 278        if (!capable(CAP_SYS_ADMIN))
 279                return -EPERM;
 280        return 0;
 281}
 282
 283static ssize_t
 284salinfo_event_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
 285{
 286        struct salinfo_data *data = PDE_DATA(file_inode(file));
 287        char cmd[32];
 288        size_t size;
 289        int i, n, cpu = -1;
 290
 291retry:
 292        if (cpumask_empty(&data->cpu_event)) {
 293                if (file->f_flags & O_NONBLOCK)
 294                        return -EAGAIN;
 295                if (wait_event_interruptible(data->read_wait,
 296                                             !cpumask_empty(&data->cpu_event)))
 297                        return -EINTR;
 298        }
 299
 300        n = data->cpu_check;
 301        for (i = 0; i < nr_cpu_ids; i++) {
 302                if (cpumask_test_cpu(n, &data->cpu_event)) {
 303                        if (!cpu_online(n)) {
 304                                cpumask_clear_cpu(n, &data->cpu_event);
 305                                continue;
 306                        }
 307                        cpu = n;
 308                        break;
 309                }
 310                if (++n == nr_cpu_ids)
 311                        n = 0;
 312        }
 313
 314        if (cpu == -1)
 315                goto retry;
 316
 317        ia64_mlogbuf_dump();
 318
 319        /* for next read, start checking at next CPU */
 320        data->cpu_check = cpu;
 321        if (++data->cpu_check == nr_cpu_ids)
 322                data->cpu_check = 0;
 323
 324        snprintf(cmd, sizeof(cmd), "read %d\n", cpu);
 325
 326        size = strlen(cmd);
 327        if (size > count)
 328                size = count;
 329        if (copy_to_user(buffer, cmd, size))
 330                return -EFAULT;
 331
 332        return size;
 333}
 334
 335static const struct file_operations salinfo_event_fops = {
 336        .open  = salinfo_event_open,
 337        .read  = salinfo_event_read,
 338        .llseek = noop_llseek,
 339};
 340
 341static int
 342salinfo_log_open(struct inode *inode, struct file *file)
 343{
 344        struct salinfo_data *data = PDE_DATA(inode);
 345
 346        if (!capable(CAP_SYS_ADMIN))
 347                return -EPERM;
 348
 349        spin_lock(&data_lock);
 350        if (data->open) {
 351                spin_unlock(&data_lock);
 352                return -EBUSY;
 353        }
 354        data->open = 1;
 355        spin_unlock(&data_lock);
 356
 357        if (data->state == STATE_NO_DATA &&
 358            !(data->log_buffer = vmalloc(ia64_sal_get_state_info_size(data->type)))) {
 359                data->open = 0;
 360                return -ENOMEM;
 361        }
 362
 363        return 0;
 364}
 365
 366static int
 367salinfo_log_release(struct inode *inode, struct file *file)
 368{
 369        struct salinfo_data *data = PDE_DATA(inode);
 370
 371        if (data->state == STATE_NO_DATA) {
 372                vfree(data->log_buffer);
 373                vfree(data->oemdata);
 374                data->log_buffer = NULL;
 375                data->oemdata = NULL;
 376        }
 377        spin_lock(&data_lock);
 378        data->open = 0;
 379        spin_unlock(&data_lock);
 380        return 0;
 381}
 382
 383static long
 384salinfo_log_read_cpu(void *context)
 385{
 386        struct salinfo_data *data = context;
 387        sal_log_record_header_t *rh;
 388        data->log_size = ia64_sal_get_state_info(data->type, (u64 *) data->log_buffer);
 389        rh = (sal_log_record_header_t *)(data->log_buffer);
 390        /* Clear corrected errors as they are read from SAL */
 391        if (rh->severity == sal_log_severity_corrected)
 392                ia64_sal_clear_state_info(data->type);
 393        return 0;
 394}
 395
 396static void
 397salinfo_log_new_read(int cpu, struct salinfo_data *data)
 398{
 399        struct salinfo_data_saved *data_saved;
 400        unsigned long flags;
 401        int i;
 402        int saved_size = ARRAY_SIZE(data->data_saved);
 403
 404        data->saved_num = 0;
 405        spin_lock_irqsave(&data_saved_lock, flags);
 406retry:
 407        for (i = 0, data_saved = data->data_saved; i < saved_size; ++i, ++data_saved) {
 408                if (data_saved->buffer && data_saved->cpu == cpu) {
 409                        sal_log_record_header_t *rh = (sal_log_record_header_t *)(data_saved->buffer);
 410                        data->log_size = data_saved->size;
 411                        memcpy(data->log_buffer, rh, data->log_size);
 412                        barrier();      /* id check must not be moved */
 413                        if (rh->id == data_saved->id) {
 414                                data->saved_num = i+1;
 415                                break;
 416                        }
 417                        /* saved record changed by mca.c since interrupt, discard it */
 418                        shift1_data_saved(data, i);
 419                        goto retry;
 420                }
 421        }
 422        spin_unlock_irqrestore(&data_saved_lock, flags);
 423
 424        if (!data->saved_num)
 425                work_on_cpu_safe(cpu, salinfo_log_read_cpu, data);
 426        if (!data->log_size) {
 427                data->state = STATE_NO_DATA;
 428                cpumask_clear_cpu(cpu, &data->cpu_event);
 429        } else {
 430                data->state = STATE_LOG_RECORD;
 431        }
 432}
 433
 434static ssize_t
 435salinfo_log_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
 436{
 437        struct salinfo_data *data = PDE_DATA(file_inode(file));
 438        u8 *buf;
 439        u64 bufsize;
 440
 441        if (data->state == STATE_LOG_RECORD) {
 442                buf = data->log_buffer;
 443                bufsize = data->log_size;
 444        } else if (data->state == STATE_OEMDATA) {
 445                buf = data->oemdata;
 446                bufsize = data->oemdata_size;
 447        } else {
 448                buf = NULL;
 449                bufsize = 0;
 450        }
 451        return simple_read_from_buffer(buffer, count, ppos, buf, bufsize);
 452}
 453
 454static long
 455salinfo_log_clear_cpu(void *context)
 456{
 457        struct salinfo_data *data = context;
 458
 459        ia64_sal_clear_state_info(data->type);
 460        return 0;
 461}
 462
 463static int
 464salinfo_log_clear(struct salinfo_data *data, int cpu)
 465{
 466        sal_log_record_header_t *rh;
 467        unsigned long flags;
 468        spin_lock_irqsave(&data_saved_lock, flags);
 469        data->state = STATE_NO_DATA;
 470        if (!cpumask_test_cpu(cpu, &data->cpu_event)) {
 471                spin_unlock_irqrestore(&data_saved_lock, flags);
 472                return 0;
 473        }
 474        cpumask_clear_cpu(cpu, &data->cpu_event);
 475        if (data->saved_num) {
 476                shift1_data_saved(data, data->saved_num - 1);
 477                data->saved_num = 0;
 478        }
 479        spin_unlock_irqrestore(&data_saved_lock, flags);
 480        rh = (sal_log_record_header_t *)(data->log_buffer);
 481        /* Corrected errors have already been cleared from SAL */
 482        if (rh->severity != sal_log_severity_corrected)
 483                work_on_cpu_safe(cpu, salinfo_log_clear_cpu, data);
 484        /* clearing a record may make a new record visible */
 485        salinfo_log_new_read(cpu, data);
 486        if (data->state == STATE_LOG_RECORD) {
 487                spin_lock_irqsave(&data_saved_lock, flags);
 488                cpumask_set_cpu(cpu, &data->cpu_event);
 489                wake_up_interruptible(&data->read_wait);
 490                spin_unlock_irqrestore(&data_saved_lock, flags);
 491        }
 492        return 0;
 493}
 494
 495static ssize_t
 496salinfo_log_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
 497{
 498        struct salinfo_data *data = PDE_DATA(file_inode(file));
 499        char cmd[32];
 500        size_t size;
 501        u32 offset;
 502        int cpu;
 503
 504        size = sizeof(cmd);
 505        if (count < size)
 506                size = count;
 507        if (copy_from_user(cmd, buffer, size))
 508                return -EFAULT;
 509
 510        if (sscanf(cmd, "read %d", &cpu) == 1) {
 511                salinfo_log_new_read(cpu, data);
 512        } else if (sscanf(cmd, "clear %d", &cpu) == 1) {
 513                int ret;
 514                if ((ret = salinfo_log_clear(data, cpu)))
 515                        count = ret;
 516        } else if (sscanf(cmd, "oemdata %d %d", &cpu, &offset) == 2) {
 517                if (data->state != STATE_LOG_RECORD && data->state != STATE_OEMDATA)
 518                        return -EINVAL;
 519                if (offset > data->log_size - sizeof(efi_guid_t))
 520                        return -EINVAL;
 521                data->state = STATE_OEMDATA;
 522                if (salinfo_platform_oemdata) {
 523                        struct salinfo_platform_oemdata_parms parms = {
 524                                .efi_guid = data->log_buffer + offset,
 525                                .oemdata = &data->oemdata,
 526                                .oemdata_size = &data->oemdata_size
 527                        };
 528                        count = work_on_cpu_safe(cpu, salinfo_platform_oemdata_cpu,
 529                                                 &parms);
 530                } else
 531                        data->oemdata_size = 0;
 532        } else
 533                return -EINVAL;
 534
 535        return count;
 536}
 537
 538static const struct file_operations salinfo_data_fops = {
 539        .open    = salinfo_log_open,
 540        .release = salinfo_log_release,
 541        .read    = salinfo_log_read,
 542        .write   = salinfo_log_write,
 543        .llseek  = default_llseek,
 544};
 545
 546static int salinfo_cpu_online(unsigned int cpu)
 547{
 548        unsigned int i, end = ARRAY_SIZE(salinfo_data);
 549        struct salinfo_data *data;
 550
 551        spin_lock_irq(&data_saved_lock);
 552        for (i = 0, data = salinfo_data; i < end; ++i, ++data) {
 553                cpumask_set_cpu(cpu, &data->cpu_event);
 554                wake_up_interruptible(&data->read_wait);
 555        }
 556        spin_unlock_irq(&data_saved_lock);
 557        return 0;
 558}
 559
 560static int salinfo_cpu_pre_down(unsigned int cpu)
 561{
 562        unsigned int i, end = ARRAY_SIZE(salinfo_data);
 563        struct salinfo_data *data;
 564
 565        spin_lock_irq(&data_saved_lock);
 566        for (i = 0, data = salinfo_data; i < end; ++i, ++data) {
 567                struct salinfo_data_saved *data_saved;
 568                int j = ARRAY_SIZE(data->data_saved) - 1;
 569
 570                for (data_saved = data->data_saved + j; j >= 0;
 571                     --j, --data_saved) {
 572                        if (data_saved->buffer && data_saved->cpu == cpu)
 573                                shift1_data_saved(data, j);
 574                }
 575                cpumask_clear_cpu(cpu, &data->cpu_event);
 576        }
 577        spin_unlock_irq(&data_saved_lock);
 578        return 0;
 579}
 580
 581static int __init
 582salinfo_init(void)
 583{
 584        struct proc_dir_entry *salinfo_dir; /* /proc/sal dir entry */
 585        struct proc_dir_entry **sdir = salinfo_proc_entries; /* keeps track of every entry */
 586        struct proc_dir_entry *dir, *entry;
 587        struct salinfo_data *data;
 588        int i;
 589
 590        salinfo_dir = proc_mkdir("sal", NULL);
 591        if (!salinfo_dir)
 592                return 0;
 593
 594        for (i=0; i < NR_SALINFO_ENTRIES; i++) {
 595                /* pass the feature bit in question as misc data */
 596                *sdir++ = proc_create_data(salinfo_entries[i].name, 0, salinfo_dir,
 597                                           &proc_salinfo_fops,
 598                                           (void *)salinfo_entries[i].feature);
 599        }
 600
 601        for (i = 0; i < ARRAY_SIZE(salinfo_log_name); i++) {
 602                data = salinfo_data + i;
 603                data->type = i;
 604                init_waitqueue_head(&data->read_wait);
 605                dir = proc_mkdir(salinfo_log_name[i], salinfo_dir);
 606                if (!dir)
 607                        continue;
 608
 609                entry = proc_create_data("event", S_IRUSR, dir,
 610                                         &salinfo_event_fops, data);
 611                if (!entry)
 612                        continue;
 613                *sdir++ = entry;
 614
 615                entry = proc_create_data("data", S_IRUSR | S_IWUSR, dir,
 616                                         &salinfo_data_fops, data);
 617                if (!entry)
 618                        continue;
 619                *sdir++ = entry;
 620
 621                *sdir++ = dir;
 622        }
 623
 624        *sdir++ = salinfo_dir;
 625
 626        init_timer(&salinfo_timer);
 627        salinfo_timer.expires = jiffies + SALINFO_TIMER_DELAY;
 628        salinfo_timer.function = &salinfo_timeout;
 629        add_timer(&salinfo_timer);
 630
 631        i = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "ia64/salinfo:online",
 632                              salinfo_cpu_online, salinfo_cpu_pre_down);
 633        WARN_ON(i < 0);
 634        return 0;
 635}
 636
 637/*
 638 * 'data' contains an integer that corresponds to the feature we're
 639 * testing
 640 */
 641static int proc_salinfo_show(struct seq_file *m, void *v)
 642{
 643        unsigned long data = (unsigned long)v;
 644        seq_puts(m, (sal_platform_features & data) ? "1\n" : "0\n");
 645        return 0;
 646}
 647
 648static int proc_salinfo_open(struct inode *inode, struct file *file)
 649{
 650        return single_open(file, proc_salinfo_show, PDE_DATA(inode));
 651}
 652
 653static const struct file_operations proc_salinfo_fops = {
 654        .open           = proc_salinfo_open,
 655        .read           = seq_read,
 656        .llseek         = seq_lseek,
 657        .release        = single_release,
 658};
 659
 660module_init(salinfo_init);
 661