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