kernel/2.6.29.6-aldebaran-rt/arch/powerpc/platforms/pseries/rtasd.c

   1 /*
   2  * Copyright (C) 2001 Anton Blanchard <anton@au.ibm.com>, IBM
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version
   7  * 2 of the License, or (at your option) any later version.
   8  *
   9  * Communication to userspace based on kernel/printk.c
  10  */
  11
  12 #include <linux/types.h>
  13 #include <linux/errno.h>
  14 #include <linux/sched.h>
  15 #include <linux/kernel.h>
  16 #include <linux/poll.h>
  17 #include <linux/proc_fs.h>
  18 #include <linux/init.h>
  19 #include <linux/vmalloc.h>
  20 #include <linux/spinlock.h>
  21 #include <linux/cpu.h>
  22 #include <linux/delay.h>
  23
  24 #include <asm/uaccess.h>
  25 #include <asm/io.h>
  26 #include <asm/rtas.h>
  27 #include <asm/prom.h>
  28 #include <asm/nvram.h>
  29 #include <asm/atomic.h>
  30 #include <asm/machdep.h>
  31
  32
  33 static DEFINE_SPINLOCK(rtasd_log_lock);
  34
  35 static DECLARE_WAIT_QUEUE_HEAD(rtas_log_wait);
  36
  37 static char *rtas_log_buf;
  38 static unsigned long rtas_log_start;
  39 static unsigned long rtas_log_size;
  40
  41 static int surveillance_timeout = -1;
  42 static unsigned int rtas_error_log_max;
  43 static unsigned int rtas_error_log_buffer_max;
  44
  45 /* RTAS service tokens */
  46 static unsigned int event_scan;
  47 static unsigned int rtas_event_scan_rate;
  48
  49 static int full_rtas_msgs = 0;
  50
  51 /* Stop logging to nvram after first fatal error */
  52 static int logging_enabled; /* Until we initialize everything,
  53                              * make sure we don't try logging
  54                              * anything */
  55 static int error_log_cnt;
  56
  57 /*
  58  * Since we use 32 bit RTAS, the physical address of this must be below
  59  * 4G or else bad things happen. Allocate this in the kernel data and
  60  * make it big enough.
  61  */
  62 static unsigned char logdata[RTAS_ERROR_LOG_MAX];
  63
  64 static char *rtas_type[] = {
  65         "Unknown", "Retry", "TCE Error", "Internal Device Failure",
  66         "Timeout", "Data Parity", "Address Parity", "Cache Parity",
  67         "Address Invalid", "ECC Uncorrected", "ECC Corrupted",
  68 };
  69
  70 static char *rtas_event_type(int type)
  71 {
  72         if ((type > 0) && (type < 11))
  73                 return rtas_type[type];
  74
  75         switch (type) {
  76                 case RTAS_TYPE_EPOW:
  77                         return "EPOW";
  78                 case RTAS_TYPE_PLATFORM:
  79                         return "Platform Error";
  80                 case RTAS_TYPE_IO:
  81                         return "I/O Event";
  82                 case RTAS_TYPE_INFO:
  83                         return "Platform Information Event";
  84                 case RTAS_TYPE_DEALLOC:
  85                         return "Resource Deallocation Event";
  86                 case RTAS_TYPE_DUMP:
  87                         return "Dump Notification Event";
  88         }
  89
  90         return rtas_type[0];
  91 }
  92
  93 /* To see this info, grep RTAS /var/log/messages and each entry
  94  * will be collected together with obvious begin/end.
  95  * There will be a unique identifier on the begin and end lines.
  96  * This will persist across reboots.
  97  *
  98  * format of error logs returned from RTAS:
  99  * bytes        (size)  : contents
 100  * --------------------------------------------------------
 101  * 0-7          (8)     : rtas_error_log
 102  * 8-47         (40)    : extended info
 103  * 48-51        (4)     : vendor id
 104  * 52-1023 (vendor specific) : location code and debug data
 105  */
 106 static void printk_log_rtas(char *buf, int len)
 107 {
 108
 109         int i,j,n = 0;
 110         int perline = 16;
 111         char buffer[64];
 112         char * str = "RTAS event";
 113
 114         if (full_rtas_msgs) {
 115                 printk(RTAS_DEBUG "%d -------- %s begin --------\n",
 116                        error_log_cnt, str);
 117
 118                 /*
 119                  * Print perline bytes on each line, each line will start
 120                  * with RTAS and a changing number, so syslogd will
 121                  * print lines that are otherwise the same.  Separate every
 122                  * 4 bytes with a space.
 123                  */
 124                 for (i = 0; i < len; i++) {
 125                         j = i % perline;
 126                         if (j == 0) {
 127                                 memset(buffer, 0, sizeof(buffer));
 128                                 n = sprintf(buffer, "RTAS %d:", i/perline);
 129                         }
 130
 131                         if ((i % 4) == 0)
 132                                 n += sprintf(buffer+n, " ");
 133
 134                         n += sprintf(buffer+n, "%02x", (unsigned char)buf[i]);
 135
 136                         if (j == (perline-1))
 137                                 printk(KERN_DEBUG "%s\n", buffer);
 138                 }
 139                 if ((i % perline) != 0)
 140                         printk(KERN_DEBUG "%s\n", buffer);
 141
 142                 printk(RTAS_DEBUG "%d -------- %s end ----------\n",
 143                        error_log_cnt, str);
 144         } else {
 145                 struct rtas_error_log *errlog = (struct rtas_error_log *)buf;
 146
 147                 printk(RTAS_DEBUG "event: %d, Type: %s, Severity: %d\n",
 148                        error_log_cnt, rtas_event_type(errlog->type),
 149                        errlog->severity);
 150         }
 151 }
 152
 153 static int log_rtas_len(char * buf)
 154 {
 155         int len;
 156         struct rtas_error_log *err;
 157
 158         /* rtas fixed header */
 159         len = 8;
 160         err = (struct rtas_error_log *)buf;
 161         if (err->extended_log_length) {
 162
 163                 /* extended header */
 164                 len += err->extended_log_length;
 165         }
 166
 167         if (rtas_error_log_max == 0)
 168                 rtas_error_log_max = rtas_get_error_log_max();
 169
 170         if (len > rtas_error_log_max)
 171                 len = rtas_error_log_max;
 172
 173         return len;
 174 }
 175
 176 /*
 177  * First write to nvram, if fatal error, that is the only
 178  * place we log the info.  The error will be picked up
 179  * on the next reboot by rtasd.  If not fatal, run the
 180  * method for the type of error.  Currently, only RTAS
 181  * errors have methods implemented, but in the future
 182  * there might be a need to store data in nvram before a
 183  * call to panic().
 184  *
 185  * XXX We write to nvram periodically, to indicate error has
 186  * been written and sync'd, but there is a possibility
 187  * that if we don't shutdown correctly, a duplicate error
 188  * record will be created on next reboot.
 189  */
 190 void pSeries_log_error(char *buf, unsigned int err_type, int fatal)
 191 {
 192         unsigned long offset;
 193         unsigned long s;
 194         int len = 0;
 195
 196         pr_debug("rtasd: logging event\n");
 197         if (buf == NULL)
 198                 return;
 199
 200         spin_lock_irqsave(&rtasd_log_lock, s);
 201
 202         /* get length and increase count */
 203         switch (err_type & ERR_TYPE_MASK) {
 204         case ERR_TYPE_RTAS_LOG:
 205                 len = log_rtas_len(buf);
 206                 if (!(err_type & ERR_FLAG_BOOT))
 207                         error_log_cnt++;
 208                 break;
 209         case ERR_TYPE_KERNEL_PANIC:
 210         default:
 211                 WARN_ON_ONCE_NONRT(!irqs_disabled()); /* @@@ DEBUG @@@ */
 212                 spin_unlock_irqrestore(&rtasd_log_lock, s);
 213                 return;
 214         }
 215
 216         /* Write error to NVRAM */
 217         if (logging_enabled && !(err_type & ERR_FLAG_BOOT))
 218                 nvram_write_error_log(buf, len, err_type, error_log_cnt);
 219
 220         /*
 221          * rtas errors can occur during boot, and we do want to capture
 222          * those somewhere, even if nvram isn't ready (why not?), and even
 223          * if rtasd isn't ready. Put them into the boot log, at least.
 224          */
 225         if ((err_type & ERR_TYPE_MASK) == ERR_TYPE_RTAS_LOG)
 226                 printk_log_rtas(buf, len);
 227
 228         /* Check to see if we need to or have stopped logging */
 229         if (fatal || !logging_enabled) {
 230                 logging_enabled = 0;
 231                 WARN_ON_ONCE_NONRT(!irqs_disabled()); /* @@@ DEBUG @@@ */
 232                 spin_unlock_irqrestore(&rtasd_log_lock, s);
 233                 return;
 234         }
 235
 236         /* call type specific method for error */
 237         switch (err_type & ERR_TYPE_MASK) {
 238         case ERR_TYPE_RTAS_LOG:
 239                 offset = rtas_error_log_buffer_max *
 240                         ((rtas_log_start+rtas_log_size) & LOG_NUMBER_MASK);
 241
 242                 /* First copy over sequence number */
 243                 memcpy(&rtas_log_buf[offset], (void *) &error_log_cnt, sizeof(int));
 244
 245                 /* Second copy over error log data */
 246                 offset += sizeof(int);
 247                 memcpy(&rtas_log_buf[offset], buf, len);
 248
 249                 if (rtas_log_size < LOG_NUMBER)
 250                         rtas_log_size += 1;
 251                 else
 252                         rtas_log_start += 1;
 253
 254                 WARN_ON_ONCE_NONRT(!irqs_disabled()); /* @@@ DEBUG @@@ */
 255                 spin_unlock_irqrestore(&rtasd_log_lock, s);
 256                 wake_up_interruptible(&rtas_log_wait);
 257                 break;
 258         case ERR_TYPE_KERNEL_PANIC:
 259         default:
 260                 WARN_ON_ONCE_NONRT(!irqs_disabled()); /* @@@ DEBUG @@@ */
 261                 spin_unlock_irqrestore(&rtasd_log_lock, s);
 262                 return;
 263         }
 264
 265 }
 266
 267
 268 static int rtas_log_open(struct inode * inode, struct file * file)
 269 {
 270         return 0;
 271 }
 272
 273 static int rtas_log_release(struct inode * inode, struct file * file)
 274 {
 275         return 0;
 276 }
 277
 278 /* This will check if all events are logged, if they are then, we
 279  * know that we can safely clear the events in NVRAM.
 280  * Next we'll sit and wait for something else to log.
 281  */
 282 static ssize_t rtas_log_read(struct file * file, char __user * buf,
 283                          size_t count, loff_t *ppos)
 284 {
 285         int error;
 286         char *tmp;
 287         unsigned long s;
 288         unsigned long offset;
 289
 290         if (!buf || count < rtas_error_log_buffer_max)
 291                 return -EINVAL;
 292
 293         count = rtas_error_log_buffer_max;
 294
 295         if (!access_ok(VERIFY_WRITE, buf, count))
 296                 return -EFAULT;
 297
 298         tmp = kmalloc(count, GFP_KERNEL);
 299         if (!tmp)
 300                 return -ENOMEM;
 301
 302         spin_lock_irqsave(&rtasd_log_lock, s);
 303         /* if it's 0, then we know we got the last one (the one in NVRAM) */
 304         while (rtas_log_size == 0) {
 305                 if (file->f_flags & O_NONBLOCK) {
 306                         spin_unlock_irqrestore(&rtasd_log_lock, s);
 307                         error = -EAGAIN;
 308                         goto out;
 309                 }
 310
 311                 if (!logging_enabled) {
 312                         spin_unlock_irqrestore(&rtasd_log_lock, s);
 313                         error = -ENODATA;
 314                         goto out;
 315                 }
 316                 nvram_clear_error_log();
 317
 318                 spin_unlock_irqrestore(&rtasd_log_lock, s);
 319                 error = wait_event_interruptible(rtas_log_wait, rtas_log_size);
 320                 if (error)
 321                         goto out;
 322                 spin_lock_irqsave(&rtasd_log_lock, s);
 323         }
 324
 325         offset = rtas_error_log_buffer_max * (rtas_log_start & LOG_NUMBER_MASK);
 326         memcpy(tmp, &rtas_log_buf[offset], count);
 327
 328         rtas_log_start += 1;
 329         rtas_log_size -= 1;
 330         spin_unlock_irqrestore(&rtasd_log_lock, s);
 331
 332         error = copy_to_user(buf, tmp, count) ? -EFAULT : count;
 333 out:
 334         kfree(tmp);
 335         return error;
 336 }
 337
 338 static unsigned int rtas_log_poll(struct file *file, poll_table * wait)
 339 {
 340         poll_wait(file, &rtas_log_wait, wait);
 341         if (rtas_log_size)
 342                 return POLLIN | POLLRDNORM;
 343         return 0;
 344 }
 345
 346 static const struct file_operations proc_rtas_log_operations = {
 347         .read =         rtas_log_read,
 348         .poll =         rtas_log_poll,
 349         .open =         rtas_log_open,
 350         .release =      rtas_log_release,
 351 };
 352
 353 static int enable_surveillance(int timeout)
 354 {
 355         int error;
 356
 357         error = rtas_set_indicator(SURVEILLANCE_TOKEN, 0, timeout);
 358
 359         if (error == 0)
 360                 return 0;
 361
 362         if (error == -EINVAL) {
 363                 printk(KERN_DEBUG "rtasd: surveillance not supported\n");
 364                 return 0;
 365         }
 366
 367         printk(KERN_ERR "rtasd: could not update surveillance\n");
 368         return -1;
 369 }
 370
 371 static void do_event_scan(void)
 372 {
 373         int error;
 374         do {
 375                 memset(logdata, 0, rtas_error_log_max);
 376                 error = rtas_call(event_scan, 4, 1, NULL,
 377                                   RTAS_EVENT_SCAN_ALL_EVENTS, 0,
 378                                   __pa(logdata), rtas_error_log_max);
 379                 if (error == -1) {
 380                         printk(KERN_ERR "event-scan failed\n");
 381                         break;
 382                 }
 383
 384                 if (error == 0)
 385                         pSeries_log_error(logdata, ERR_TYPE_RTAS_LOG, 0);
 386
 387         } while(error == 0);
 388 }
 389
 390 static void do_event_scan_all_cpus(long delay)
 391 {
 392         int cpu;
 393
 394         get_online_cpus();
 395         cpu = first_cpu(cpu_online_map);
 396         for (;;) {
 397                 set_cpus_allowed(current, cpumask_of_cpu(cpu));
 398                 do_event_scan();
 399                 set_cpus_allowed(current, CPU_MASK_ALL);
 400
 401                 /* Drop hotplug lock, and sleep for the specified delay */
 402                 put_online_cpus();
 403                 msleep_interruptible(delay);
 404                 get_online_cpus();
 405
 406                 cpu = next_cpu(cpu, cpu_online_map);
 407                 if (cpu == NR_CPUS)
 408                         break;
 409         }
 410         put_online_cpus();
 411 }
 412
 413 static int rtasd(void *unused)
 414 {
 415         unsigned int err_type;
 416         int rc;
 417
 418         daemonize("rtasd");
 419
 420         printk(KERN_DEBUG "RTAS daemon started\n");
 421         pr_debug("rtasd: will sleep for %d milliseconds\n",
 422                  (30000 / rtas_event_scan_rate));
 423
 424         /* See if we have any error stored in NVRAM */
 425         memset(logdata, 0, rtas_error_log_max);
 426         rc = nvram_read_error_log(logdata, rtas_error_log_max,
 427                                   &err_type, &error_log_cnt);
 428         /* We can use rtas_log_buf now */
 429         logging_enabled = 1;
 430
 431         if (!rc) {
 432                 if (err_type != ERR_FLAG_ALREADY_LOGGED) {
 433                         pSeries_log_error(logdata, err_type | ERR_FLAG_BOOT, 0);
 434                 }
 435         }
 436
 437         /* First pass. */
 438         do_event_scan_all_cpus(1000);
 439
 440         if (surveillance_timeout != -1) {
 441                 pr_debug("rtasd: enabling surveillance\n");
 442                 enable_surveillance(surveillance_timeout);
 443                 pr_debug("rtasd: surveillance enabled\n");
 444         }
 445
 446         /* Delay should be at least one second since some
 447          * machines have problems if we call event-scan too
 448          * quickly. */
 449         for (;;)
 450                 do_event_scan_all_cpus(30000/rtas_event_scan_rate);
 451
 452         return -EINVAL;
 453 }
 454
 455 static int __init rtas_init(void)
 456 {
 457         struct proc_dir_entry *entry;
 458
 459         if (!machine_is(pseries))
 460                 return 0;
 461
 462         /* No RTAS */
 463         event_scan = rtas_token("event-scan");
 464         if (event_scan == RTAS_UNKNOWN_SERVICE) {
 465                 printk(KERN_DEBUG "rtasd: no event-scan on system\n");
 466                 return -ENODEV;
 467         }
 468
 469         rtas_event_scan_rate = rtas_token("rtas-event-scan-rate");
 470         if (rtas_event_scan_rate == RTAS_UNKNOWN_SERVICE) {
 471                 printk(KERN_ERR "rtasd: no rtas-event-scan-rate on system\n");
 472                 return -ENODEV;
 473         }
 474
 475         /* Make room for the sequence number */
 476         rtas_error_log_max = rtas_get_error_log_max();
 477         rtas_error_log_buffer_max = rtas_error_log_max + sizeof(int);
 478
 479         rtas_log_buf = vmalloc(rtas_error_log_buffer_max*LOG_NUMBER);
 480         if (!rtas_log_buf) {
 481                 printk(KERN_ERR "rtasd: no memory\n");
 482                 return -ENOMEM;
 483         }
 484
 485         entry = proc_create("ppc64/rtas/error_log", S_IRUSR, NULL,
 486                             &proc_rtas_log_operations);
 487         if (!entry)
 488                 printk(KERN_ERR "Failed to create error_log proc entry\n");
 489
 490         if (kernel_thread(rtasd, NULL, CLONE_FS) < 0)
 491                 printk(KERN_ERR "Failed to start RTAS daemon\n");
 492
 493         return 0;
 494 }
 495
 496 static int __init surveillance_setup(char *str)
 497 {
 498         int i;
 499
 500         if (get_option(&str,&i)) {
 501                 if (i >= 0 && i <= 255)
 502                         surveillance_timeout = i;
 503         }
 504
 505         return 1;
 506 }
 507
 508 static int __init rtasmsgs_setup(char *str)
 509 {
 510         if (strcmp(str, "on") == 0)
 511                 full_rtas_msgs = 1;
 512         else if (strcmp(str, "off") == 0)
 513                 full_rtas_msgs = 0;
 514
 515         return 1;
 516 }
 517 __initcall(rtas_init);
 518 __setup("surveillance=", surveillance_setup);
 519 __setup("rtasmsgs=", rtasmsgs_setup);