arch/ppc64/kernel/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/systemcfg.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_event_scan_rate;
  48 static unsigned int rtas_error_log_max;
  49 static unsigned int rtas_error_log_buffer_max;
  50
  51 static int full_rtas_msgs = 0;
  52
  53 extern int no_logging;
  54
  55 volatile int error_log_cnt = 0;
  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 int get_eventscan_parms(void);
  65
  66 static char *rtas_type[] = {
  67         "Unknown", "Retry", "TCE Error", "Internal Device Failure",
  68         "Timeout", "Data Parity", "Address Parity", "Cache Parity",
  69         "Address Invalid", "ECC Uncorrected", "ECC Corrupted",
  70 };
  71
  72 static char *rtas_event_type(int type)
  73 {
  74         if ((type > 0) && (type < 11))
  75                 return rtas_type[type];
  76
  77         switch (type) {
  78                 case RTAS_TYPE_EPOW:
  79                         return "EPOW";
  80                 case RTAS_TYPE_PLATFORM:
  81                         return "Platform Error";
  82                 case RTAS_TYPE_IO:
  83                         return "I/O Event";
  84                 case RTAS_TYPE_INFO:
  85                         return "Platform Information Event";
  86                 case RTAS_TYPE_DEALLOC:
  87                         return "Resource Deallocation Event";
  88                 case RTAS_TYPE_DUMP:
  89                         return "Dump Notification Event";
  90         }
  91
  92         return rtas_type[0];
  93 }
  94
  95 /* To see this info, grep RTAS /var/log/messages and each entry
  96  * will be collected together with obvious begin/end.
  97  * There will be a unique identifier on the begin and end lines.
  98  * This will persist across reboots.
  99  *
 100  * format of error logs returned from RTAS:
 101  * bytes        (size)  : contents
 102  * --------------------------------------------------------
 103  * 0-7          (8)     : rtas_error_log
 104  * 8-47         (40)    : extended info
 105  * 48-51        (4)     : vendor id
 106  * 52-1023 (vendor specific) : location code and debug data
 107  */
 108 static void printk_log_rtas(char *buf, int len)
 109 {
 110
 111         int i,j,n = 0;
 112         int perline = 16;
 113         char buffer[64];
 114         char * str = "RTAS event";
 115
 116         if (full_rtas_msgs) {
 117                 printk(RTAS_DEBUG "%d -------- %s begin --------\n",
 118                        error_log_cnt, str);
 119
 120                 /*
 121                  * Print perline bytes on each line, each line will start
 122                  * with RTAS and a changing number, so syslogd will
 123                  * print lines that are otherwise the same.  Separate every
 124                  * 4 bytes with a space.
 125                  */
 126                 for (i = 0; i < len; i++) {
 127                         j = i % perline;
 128                         if (j == 0) {
 129                                 memset(buffer, 0, sizeof(buffer));
 130                                 n = sprintf(buffer, "RTAS %d:", i/perline);
 131                         }
 132
 133                         if ((i % 4) == 0)
 134                                 n += sprintf(buffer+n, " ");
 135
 136                         n += sprintf(buffer+n, "%02x", (unsigned char)buf[i]);
 137
 138                         if (j == (perline-1))
 139                                 printk(KERN_DEBUG "%s\n", buffer);
 140                 }
 141                 if ((i % perline) != 0)
 142                         printk(KERN_DEBUG "%s\n", buffer);
 143
 144                 printk(RTAS_DEBUG "%d -------- %s end ----------\n",
 145                        error_log_cnt, str);
 146         } else {
 147                 struct rtas_error_log *errlog = (struct rtas_error_log *)buf;
 148
 149                 printk(RTAS_DEBUG "event: %d, Type: %s, Severity: %d\n",
 150                        error_log_cnt, rtas_event_type(errlog->type),
 151                        errlog->severity);
 152         }
 153 }
 154
 155 static int log_rtas_len(char * buf)
 156 {
 157         int len;
 158         struct rtas_error_log *err;
 159
 160         /* rtas fixed header */
 161         len = 8;
 162         err = (struct rtas_error_log *)buf;
 163         if (err->extended_log_length) {
 164
 165                 /* extended header */
 166                 len += err->extended_log_length;
 167         }
 168
 169         if (rtas_error_log_max == 0) {
 170                 get_eventscan_parms();
 171         }
 172         if (len > rtas_error_log_max)
 173                 len = rtas_error_log_max;
 174
 175         return len;
 176 }
 177
 178 /*
 179  * First write to nvram, if fatal error, that is the only
 180  * place we log the info.  The error will be picked up
 181  * on the next reboot by rtasd.  If not fatal, run the
 182  * method for the type of error.  Currently, only RTAS
 183  * errors have methods implemented, but in the future
 184  * there might be a need to store data in nvram before a
 185  * call to panic().
 186  *
 187  * XXX We write to nvram periodically, to indicate error has
 188  * been written and sync'd, but there is a possibility
 189  * that if we don't shutdown correctly, a duplicate error
 190  * record will be created on next reboot.
 191  */
 192 void pSeries_log_error(char *buf, unsigned int err_type, int fatal)
 193 {
 194         unsigned long offset;
 195         unsigned long s;
 196         int len = 0;
 197
 198         DEBUG("logging event\n");
 199         if (buf == NULL)
 200                 return;
 201
 202         spin_lock_irqsave(&rtasd_log_lock, s);
 203
 204         /* get length and increase count */
 205         switch (err_type & ERR_TYPE_MASK) {
 206         case ERR_TYPE_RTAS_LOG:
 207                 len = log_rtas_len(buf);
 208                 if (!(err_type & ERR_FLAG_BOOT))
 209                         error_log_cnt++;
 210                 break;
 211         case ERR_TYPE_KERNEL_PANIC:
 212         default:
 213                 spin_unlock_irqrestore(&rtasd_log_lock, s);
 214                 return;
 215         }
 216
 217         /* Write error to NVRAM */
 218         if (!no_logging && !(err_type & ERR_FLAG_BOOT))
 219                 nvram_write_error_log(buf, len, err_type);
 220
 221         /*
 222          * rtas errors can occur during boot, and we do want to capture
 223          * those somewhere, even if nvram isn't ready (why not?), and even
 224          * if rtasd isn't ready. Put them into the boot log, at least.
 225          */
 226         if ((err_type & ERR_TYPE_MASK) == ERR_TYPE_RTAS_LOG)
 227                 printk_log_rtas(buf, len);
 228
 229         /* Check to see if we need to or have stopped logging */
 230         if (fatal || no_logging) {
 231                 no_logging = 1;
 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                 spin_unlock_irqrestore(&rtasd_log_lock, s);
 255                 wake_up_interruptible(&rtas_log_wait);
 256                 break;
 257         case ERR_TYPE_KERNEL_PANIC:
 258         default:
 259                 spin_unlock_irqrestore(&rtasd_log_lock, s);
 260                 return;
 261         }
 262
 263 }
 264
 265
 266 static int rtas_log_open(struct inode * inode, struct file * file)
 267 {
 268         return 0;
 269 }
 270
 271 static int rtas_log_release(struct inode * inode, struct file * file)
 272 {
 273         return 0;
 274 }
 275
 276 /* This will check if all events are logged, if they are then, we
 277  * know that we can safely clear the events in NVRAM.
 278  * Next we'll sit and wait for something else to log.
 279  */
 280 static ssize_t rtas_log_read(struct file * file, char __user * buf,
 281                          size_t count, loff_t *ppos)
 282 {
 283         int error;
 284         char *tmp;
 285         unsigned long s;
 286         unsigned long offset;
 287
 288         if (!buf || count < rtas_error_log_buffer_max)
 289                 return -EINVAL;
 290
 291         count = rtas_error_log_buffer_max;
 292
 293         if (!access_ok(VERIFY_WRITE, buf, count))
 294                 return -EFAULT;
 295
 296         tmp = kmalloc(count, GFP_KERNEL);
 297         if (!tmp)
 298                 return -ENOMEM;
 299
 300
 301         spin_lock_irqsave(&rtasd_log_lock, s);
 302         /* if it's 0, then we know we got the last one (the one in NVRAM) */
 303         if (rtas_log_size == 0 && !no_logging)
 304                 nvram_clear_error_log();
 305         spin_unlock_irqrestore(&rtasd_log_lock, s);
 306
 307
 308         error = wait_event_interruptible(rtas_log_wait, rtas_log_size);
 309         if (error)
 310                 goto out;
 311
 312         spin_lock_irqsave(&rtasd_log_lock, s);
 313         offset = rtas_error_log_buffer_max * (rtas_log_start & LOG_NUMBER_MASK);
 314         memcpy(tmp, &rtas_log_buf[offset], count);
 315
 316         rtas_log_start += 1;
 317         rtas_log_size -= 1;
 318         spin_unlock_irqrestore(&rtasd_log_lock, s);
 319
 320         error = copy_to_user(buf, tmp, count) ? -EFAULT : count;
 321 out:
 322         kfree(tmp);
 323         return error;
 324 }
 325
 326 static unsigned int rtas_log_poll(struct file *file, poll_table * wait)
 327 {
 328         poll_wait(file, &rtas_log_wait, wait);
 329         if (rtas_log_size)
 330                 return POLLIN | POLLRDNORM;
 331         return 0;
 332 }
 333
 334 struct file_operations proc_rtas_log_operations = {
 335         .read =         rtas_log_read,
 336         .poll =         rtas_log_poll,
 337         .open =         rtas_log_open,
 338         .release =      rtas_log_release,
 339 };
 340
 341 static int enable_surveillance(int timeout)
 342 {
 343         int error;
 344
 345         error = rtas_set_indicator(SURVEILLANCE_TOKEN, 0, timeout);
 346
 347         if (error == 0)
 348                 return 0;
 349
 350         if (error == -EINVAL) {
 351                 printk(KERN_INFO "rtasd: surveillance not supported\n");
 352                 return 0;
 353         }
 354
 355         printk(KERN_ERR "rtasd: could not update surveillance\n");
 356         return -1;
 357 }
 358
 359 static int get_eventscan_parms(void)
 360 {
 361         struct device_node *node;
 362         int *ip;
 363
 364         node = of_find_node_by_path("/rtas");
 365
 366         ip = (int *)get_property(node, "rtas-event-scan-rate", NULL);
 367         if (ip == NULL) {
 368                 printk(KERN_ERR "rtasd: no rtas-event-scan-rate\n");
 369                 of_node_put(node);
 370                 return -1;
 371         }
 372         rtas_event_scan_rate = *ip;
 373         DEBUG("rtas-event-scan-rate %d\n", rtas_event_scan_rate);
 374
 375         /* Make room for the sequence number */
 376         rtas_error_log_max = rtas_get_error_log_max();
 377         rtas_error_log_buffer_max = rtas_error_log_max + sizeof(int);
 378
 379         of_node_put(node);
 380
 381         return 0;
 382 }
 383
 384 static void do_event_scan(int event_scan)
 385 {
 386         int error;
 387         do {
 388                 memset(logdata, 0, rtas_error_log_max);
 389                 error = rtas_call(event_scan, 4, 1, NULL,
 390                                   RTAS_EVENT_SCAN_ALL_EVENTS, 0,
 391                                   __pa(logdata), rtas_error_log_max);
 392                 if (error == -1) {
 393                         printk(KERN_ERR "event-scan failed\n");
 394                         break;
 395                 }
 396
 397                 if (error == 0)
 398                         pSeries_log_error(logdata, ERR_TYPE_RTAS_LOG, 0);
 399
 400         } while(error == 0);
 401 }
 402
 403 static void do_event_scan_all_cpus(long delay)
 404 {
 405         int cpu;
 406
 407         lock_cpu_hotplug();
 408         cpu = first_cpu(cpu_online_map);
 409         for (;;) {
 410                 set_cpus_allowed(current, cpumask_of_cpu(cpu));
 411                 do_event_scan(rtas_token("event-scan"));
 412                 set_cpus_allowed(current, CPU_MASK_ALL);
 413
 414                 /* Drop hotplug lock, and sleep for the specified delay */
 415                 unlock_cpu_hotplug();
 416                 msleep_interruptible(delay);
 417                 lock_cpu_hotplug();
 418
 419                 cpu = next_cpu(cpu, cpu_online_map);
 420                 if (cpu == NR_CPUS)
 421                         break;
 422         }
 423         unlock_cpu_hotplug();
 424 }
 425
 426 static int rtasd(void *unused)
 427 {
 428         unsigned int err_type;
 429         int event_scan = rtas_token("event-scan");
 430         int rc;
 431
 432         daemonize("rtasd");
 433
 434         if (event_scan == RTAS_UNKNOWN_SERVICE || get_eventscan_parms() == -1)
 435                 goto error;
 436
 437         rtas_log_buf = vmalloc(rtas_error_log_buffer_max*LOG_NUMBER);
 438         if (!rtas_log_buf) {
 439                 printk(KERN_ERR "rtasd: no memory\n");
 440                 goto error;
 441         }
 442
 443         printk(KERN_INFO "RTAS daemon started\n");
 444
 445         DEBUG("will sleep for %d milliseconds\n", (30000/rtas_event_scan_rate));
 446
 447         /* See if we have any error stored in NVRAM */
 448         memset(logdata, 0, rtas_error_log_max);
 449
 450         rc = nvram_read_error_log(logdata, rtas_error_log_max, &err_type);
 451
 452         /* We can use rtas_log_buf now */
 453         no_logging = 0;
 454
 455         if (!rc) {
 456                 if (err_type != ERR_FLAG_ALREADY_LOGGED) {
 457                         pSeries_log_error(logdata, err_type | ERR_FLAG_BOOT, 0);
 458                 }
 459         }
 460
 461         /* First pass. */
 462         do_event_scan_all_cpus(1000);
 463
 464         if (surveillance_timeout != -1) {
 465                 DEBUG("enabling surveillance\n");
 466                 enable_surveillance(surveillance_timeout);
 467                 DEBUG("surveillance enabled\n");
 468         }
 469
 470         /* Delay should be at least one second since some
 471          * machines have problems if we call event-scan too
 472          * quickly. */
 473         for (;;)
 474                 do_event_scan_all_cpus(30000/rtas_event_scan_rate);
 475
 476 error:
 477         /* Should delete proc entries */
 478         return -EINVAL;
 479 }
 480
 481 static int __init rtas_init(void)
 482 {
 483         struct proc_dir_entry *entry;
 484
 485         /* No RTAS, only warn if we are on a pSeries box  */
 486         if (rtas_token("event-scan") == RTAS_UNKNOWN_SERVICE) {
 487                 if (systemcfg->platform & PLATFORM_PSERIES)
 488                         printk(KERN_INFO "rtasd: no event-scan on system\n");
 489                 return 1;
 490         }
 491
 492         entry = create_proc_entry("ppc64/rtas/error_log", S_IRUSR, NULL);
 493         if (entry)
 494                 entry->proc_fops = &proc_rtas_log_operations;
 495         else
 496                 printk(KERN_ERR "Failed to create error_log proc entry\n");
 497
 498         if (kernel_thread(rtasd, NULL, CLONE_FS) < 0)
 499                 printk(KERN_ERR "Failed to start RTAS daemon\n");
 500
 501         return 0;
 502 }
 503
 504 static int __init surveillance_setup(char *str)
 505 {
 506         int i;
 507
 508         if (get_option(&str,&i)) {
 509                 if (i >= 0 && i <= 255)
 510                         surveillance_timeout = i;
 511         }
 512
 513         return 1;
 514 }
 515
 516 static int __init rtasmsgs_setup(char *str)
 517 {
 518         if (strcmp(str, "on") == 0)
 519                 full_rtas_msgs = 1;
 520         else if (strcmp(str, "off") == 0)
 521                 full_rtas_msgs = 0;
 522
 523         return 1;
 524 }
 525 __initcall(rtas_init);
 526 __setup("surveillance=", surveillance_setup);
 527 __setup("rtasmsgs=", rtasmsgs_setup);