arch/ia64/kernel/mca.c

   1 /*
   2  * File:        mca.c
   3  * Purpose:     Generic MCA handling layer
   4  *
   5  * Copyright (C) 2003 Hewlett-Packard Co
   6  *      David Mosberger-Tang <davidm@hpl.hp.com>
   7  *
   8  * Copyright (C) 2002 Dell Inc.
   9  * Copyright (C) Matt Domsch <Matt_Domsch@dell.com>
  10  *
  11  * Copyright (C) 2002 Intel
  12  * Copyright (C) Jenna Hall <jenna.s.hall@intel.com>
  13  *
  14  * Copyright (C) 2001 Intel
  15  * Copyright (C) Fred Lewis <frederick.v.lewis@intel.com>
  16  *
  17  * Copyright (C) 2000 Intel
  18  * Copyright (C) Chuck Fleckenstein <cfleck@co.intel.com>
  19  *
  20  * Copyright (C) 1999, 2004-2008 Silicon Graphics, Inc.
  21  * Copyright (C) Vijay Chander <vijay@engr.sgi.com>
  22  *
  23  * Copyright (C) 2006 FUJITSU LIMITED
  24  * Copyright (C) Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
  25  *
  26  * 2000-03-29 Chuck Fleckenstein <cfleck@co.intel.com>
  27  *            Fixed PAL/SAL update issues, began MCA bug fixes, logging issues,
  28  *            added min save state dump, added INIT handler.
  29  *
  30  * 2001-01-03 Fred Lewis <frederick.v.lewis@intel.com>
  31  *            Added setup of CMCI and CPEI IRQs, logging of corrected platform
  32  *            errors, completed code for logging of corrected & uncorrected
  33  *            machine check errors, and updated for conformance with Nov. 2000
  34  *            revision of the SAL 3.0 spec.
  35  *
  36  * 2002-01-04 Jenna Hall <jenna.s.hall@intel.com>
  37  *            Aligned MCA stack to 16 bytes, added platform vs. CPU error flag,
  38  *            set SAL default return values, changed error record structure to
  39  *            linked list, added init call to sal_get_state_info_size().
  40  *
  41  * 2002-03-25 Matt Domsch <Matt_Domsch@dell.com>
  42  *            GUID cleanups.
  43  *
  44  * 2003-04-15 David Mosberger-Tang <davidm@hpl.hp.com>
  45  *            Added INIT backtrace support.
  46  *
  47  * 2003-12-08 Keith Owens <kaos@sgi.com>
  48  *            smp_call_function() must not be called from interrupt context
  49  *            (can deadlock on tasklist_lock).
  50  *            Use keventd to call smp_call_function().
  51  *
  52  * 2004-02-01 Keith Owens <kaos@sgi.com>
  53  *            Avoid deadlock when using printk() for MCA and INIT records.
  54  *            Delete all record printing code, moved to salinfo_decode in user
  55  *            space.  Mark variables and functions static where possible.
  56  *            Delete dead variables and functions.  Reorder to remove the need
  57  *            for forward declarations and to consolidate related code.
  58  *
  59  * 2005-08-12 Keith Owens <kaos@sgi.com>
  60  *            Convert MCA/INIT handlers to use per event stacks and SAL/OS
  61  *            state.
  62  *
  63  * 2005-10-07 Keith Owens <kaos@sgi.com>
  64  *            Add notify_die() hooks.
  65  *
  66  * 2006-09-15 Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
  67  *            Add printing support for MCA/INIT.
  68  *
  69  * 2007-04-27 Russ Anderson <rja@sgi.com>
  70  *            Support multiple cpus going through OS_MCA in the same event.
  71  */
  72 #include <linux/jiffies.h>
  73 #include <linux/types.h>
  74 #include <linux/init.h>
  75 #include <linux/sched.h>
  76 #include <linux/interrupt.h>
  77 #include <linux/irq.h>
  78 #include <linux/bootmem.h>
  79 #include <linux/acpi.h>
  80 #include <linux/timer.h>
  81 #include <linux/module.h>
  82 #include <linux/kernel.h>
  83 #include <linux/smp.h>
  84 #include <linux/workqueue.h>
  85 #include <linux/cpumask.h>
  86 #include <linux/kdebug.h>
  87 #include <linux/cpu.h>
  88
  89 #include <asm/delay.h>
  90 #include <asm/machvec.h>
  91 #include <asm/meminit.h>
  92 #include <asm/page.h>
  93 #include <asm/ptrace.h>
  94 #include <asm/system.h>
  95 #include <asm/sal.h>
  96 #include <asm/mca.h>
  97 #include <asm/kexec.h>
  98
  99 #include <asm/irq.h>
 100 #include <asm/hw_irq.h>
 101 #include <asm/tlb.h>
 102
 103 #include "mca_drv.h"
 104 #include "entry.h"
 105
 106 #if defined(IA64_MCA_DEBUG_INFO)
 107 # define IA64_MCA_DEBUG(fmt...) printk(fmt)
 108 #else
 109 # define IA64_MCA_DEBUG(fmt...)
 110 #endif
 111
 112 #define NOTIFY_INIT(event, regs, arg, spin)                             \
 113 do {                                                                    \
 114         if ((notify_die((event), "INIT", (regs), (arg), 0, 0)           \
 115                         == NOTIFY_STOP) && ((spin) == 1))               \
 116                 ia64_mca_spin(__func__);                                \
 117 } while (0)
 118
 119 #define NOTIFY_MCA(event, regs, arg, spin)                              \
 120 do {                                                                    \
 121         if ((notify_die((event), "MCA", (regs), (arg), 0, 0)            \
 122                         == NOTIFY_STOP) && ((spin) == 1))               \
 123                 ia64_mca_spin(__func__);                                \
 124 } while (0)
 125
 126 /* Used by mca_asm.S */
 127 DEFINE_PER_CPU(u64, ia64_mca_data); /* == __per_cpu_mca[smp_processor_id()] */
 128 DEFINE_PER_CPU(u64, ia64_mca_per_cpu_pte); /* PTE to map per-CPU area */
 129 DEFINE_PER_CPU(u64, ia64_mca_pal_pte);      /* PTE to map PAL code */
 130 DEFINE_PER_CPU(u64, ia64_mca_pal_base);    /* vaddr PAL code granule */
 131 DEFINE_PER_CPU(u64, ia64_mca_tr_reload);   /* Flag for TR reload */
 132
 133 unsigned long __per_cpu_mca[NR_CPUS];
 134
 135 /* In mca_asm.S */
 136 extern void                     ia64_os_init_dispatch_monarch (void);
 137 extern void                     ia64_os_init_dispatch_slave (void);
 138
 139 static int monarch_cpu = -1;
 140
 141 static ia64_mc_info_t           ia64_mc_info;
 142
 143 #define MAX_CPE_POLL_INTERVAL (15*60*HZ) /* 15 minutes */
 144 #define MIN_CPE_POLL_INTERVAL (2*60*HZ)  /* 2 minutes */
 145 #define CMC_POLL_INTERVAL     (1*60*HZ)  /* 1 minute */
 146 #define CPE_HISTORY_LENGTH    5
 147 #define CMC_HISTORY_LENGTH    5
 148
 149 #ifdef CONFIG_ACPI
 150 static struct timer_list cpe_poll_timer;
 151 #endif
 152 static struct timer_list cmc_poll_timer;
 153 /*
 154  * This variable tells whether we are currently in polling mode.
 155  * Start with this in the wrong state so we won't play w/ timers
 156  * before the system is ready.
 157  */
 158 static int cmc_polling_enabled = 1;
 159
 160 /*
 161  * Clearing this variable prevents CPE polling from getting activated
 162  * in mca_late_init.  Use it if your system doesn't provide a CPEI,
 163  * but encounters problems retrieving CPE logs.  This should only be
 164  * necessary for debugging.
 165  */
 166 static int cpe_poll_enabled = 1;
 167
 168 extern void salinfo_log_wakeup(int type, u8 *buffer, u64 size, int irqsafe);
 169
 170 static int mca_init __initdata;
 171
 172 /*
 173  * limited & delayed printing support for MCA/INIT handler
 174  */
 175
 176 #define mprintk(fmt...) ia64_mca_printk(fmt)
 177
 178 #define MLOGBUF_SIZE (512+256*NR_CPUS)
 179 #define MLOGBUF_MSGMAX 256
 180 static char mlogbuf[MLOGBUF_SIZE];
 181 static DEFINE_SPINLOCK(mlogbuf_wlock);  /* mca context only */
 182 static DEFINE_SPINLOCK(mlogbuf_rlock);  /* normal context only */
 183 static unsigned long mlogbuf_start;
 184 static unsigned long mlogbuf_end;
 185 static unsigned int mlogbuf_finished = 0;
 186 static unsigned long mlogbuf_timestamp = 0;
 187
 188 static int loglevel_save = -1;
 189 #define BREAK_LOGLEVEL(__console_loglevel)              \
 190         oops_in_progress = 1;                           \
 191         if (loglevel_save < 0)                          \
 192                 loglevel_save = __console_loglevel;     \
 193         __console_loglevel = 15;
 194
 195 #define RESTORE_LOGLEVEL(__console_loglevel)            \
 196         if (loglevel_save >= 0) {                       \
 197                 __console_loglevel = loglevel_save;     \
 198                 loglevel_save = -1;                     \
 199         }                                               \
 200         mlogbuf_finished = 0;                           \
 201         oops_in_progress = 0;
 202
 203 /*
 204  * Push messages into buffer, print them later if not urgent.
 205  */
 206 void ia64_mca_printk(const char *fmt, ...)
 207 {
 208         va_list args;
 209         int printed_len;
 210         char temp_buf[MLOGBUF_MSGMAX];
 211         char *p;
 212
 213         va_start(args, fmt);
 214         printed_len = vscnprintf(temp_buf, sizeof(temp_buf), fmt, args);
 215         va_end(args);
 216
 217         /* Copy the output into mlogbuf */
 218         if (oops_in_progress) {
 219                 /* mlogbuf was abandoned, use printk directly instead. */
 220                 printk(temp_buf);
 221         } else {
 222                 spin_lock(&mlogbuf_wlock);
 223                 for (p = temp_buf; *p; p++) {
 224                         unsigned long next = (mlogbuf_end + 1) % MLOGBUF_SIZE;
 225                         if (next != mlogbuf_start) {
 226                                 mlogbuf[mlogbuf_end] = *p;
 227                                 mlogbuf_end = next;
 228                         } else {
 229                                 /* buffer full */
 230                                 break;
 231                         }
 232                 }
 233                 mlogbuf[mlogbuf_end] = '\0';
 234                 spin_unlock(&mlogbuf_wlock);
 235         }
 236 }
 237 EXPORT_SYMBOL(ia64_mca_printk);
 238
 239 /*
 240  * Print buffered messages.
 241  *  NOTE: call this after returning normal context. (ex. from salinfod)
 242  */
 243 void ia64_mlogbuf_dump(void)
 244 {
 245         char temp_buf[MLOGBUF_MSGMAX];
 246         char *p;
 247         unsigned long index;
 248         unsigned long flags;
 249         unsigned int printed_len;
 250
 251         /* Get output from mlogbuf */
 252         while (mlogbuf_start != mlogbuf_end) {
 253                 temp_buf[0] = '\0';
 254                 p = temp_buf;
 255                 printed_len = 0;
 256
 257                 spin_lock_irqsave(&mlogbuf_rlock, flags);
 258
 259                 index = mlogbuf_start;
 260                 while (index != mlogbuf_end) {
 261                         *p = mlogbuf[index];
 262                         index = (index + 1) % MLOGBUF_SIZE;
 263                         if (!*p)
 264                                 break;
 265                         p++;
 266                         if (++printed_len >= MLOGBUF_MSGMAX - 1)
 267                                 break;
 268                 }
 269                 *p = '\0';
 270                 if (temp_buf[0])
 271                         printk(temp_buf);
 272                 mlogbuf_start = index;
 273
 274                 mlogbuf_timestamp = 0;
 275                 spin_unlock_irqrestore(&mlogbuf_rlock, flags);
 276         }
 277 }
 278 EXPORT_SYMBOL(ia64_mlogbuf_dump);
 279
 280 /*
 281  * Call this if system is going to down or if immediate flushing messages to
 282  * console is required. (ex. recovery was failed, crash dump is going to be
 283  * invoked, long-wait rendezvous etc.)
 284  *  NOTE: this should be called from monarch.
 285  */
 286 static void ia64_mlogbuf_finish(int wait)
 287 {
 288         BREAK_LOGLEVEL(console_loglevel);
 289
 290         spin_lock_init(&mlogbuf_rlock);
 291         ia64_mlogbuf_dump();
 292         printk(KERN_EMERG "mlogbuf_finish: printing switched to urgent mode, "
 293                 "MCA/INIT might be dodgy or fail.\n");
 294
 295         if (!wait)
 296                 return;
 297
 298         /* wait for console */
 299         printk("Delaying for 5 seconds...\n");
 300         udelay(5*1000000);
 301
 302         mlogbuf_finished = 1;
 303 }
 304
 305 /*
 306  * Print buffered messages from INIT context.
 307  */
 308 static void ia64_mlogbuf_dump_from_init(void)
 309 {
 310         if (mlogbuf_finished)
 311                 return;
 312
 313         if (mlogbuf_timestamp &&
 314                         time_before(jiffies, mlogbuf_timestamp + 30 * HZ)) {
 315                 printk(KERN_ERR "INIT: mlogbuf_dump is interrupted by INIT "
 316                         " and the system seems to be messed up.\n");
 317                 ia64_mlogbuf_finish(0);
 318                 return;
 319         }
 320
 321         if (!spin_trylock(&mlogbuf_rlock)) {
 322                 printk(KERN_ERR "INIT: mlogbuf_dump is interrupted by INIT. "
 323                         "Generated messages other than stack dump will be "
 324                         "buffered to mlogbuf and will be printed later.\n");
 325                 printk(KERN_ERR "INIT: If messages would not printed after "
 326                         "this INIT, wait 30sec and assert INIT again.\n");
 327                 if (!mlogbuf_timestamp)
 328                         mlogbuf_timestamp = jiffies;
 329                 return;
 330         }
 331         spin_unlock(&mlogbuf_rlock);
 332         ia64_mlogbuf_dump();
 333 }
 334
 335 static void inline
 336 ia64_mca_spin(const char *func)
 337 {
 338         if (monarch_cpu == smp_processor_id())
 339                 ia64_mlogbuf_finish(0);
 340         mprintk(KERN_EMERG "%s: spinning here, not returning to SAL\n", func);
 341         while (1)
 342                 cpu_relax();
 343 }
 344 /*
 345  * IA64_MCA log support
 346  */
 347 #define IA64_MAX_LOGS           2       /* Double-buffering for nested MCAs */
 348 #define IA64_MAX_LOG_TYPES      4   /* MCA, INIT, CMC, CPE */
 349
 350 typedef struct ia64_state_log_s
 351 {
 352         spinlock_t      isl_lock;
 353         int             isl_index;
 354         unsigned long   isl_count;
 355         ia64_err_rec_t  *isl_log[IA64_MAX_LOGS]; /* need space to store header + error log */
 356 } ia64_state_log_t;
 357
 358 static ia64_state_log_t ia64_state_log[IA64_MAX_LOG_TYPES];
 359
 360 #define IA64_LOG_ALLOCATE(it, size) \
 361         {ia64_state_log[it].isl_log[IA64_LOG_CURR_INDEX(it)] = \
 362                 (ia64_err_rec_t *)alloc_bootmem(size); \
 363         ia64_state_log[it].isl_log[IA64_LOG_NEXT_INDEX(it)] = \
 364                 (ia64_err_rec_t *)alloc_bootmem(size);}
 365 #define IA64_LOG_LOCK_INIT(it) spin_lock_init(&ia64_state_log[it].isl_lock)
 366 #define IA64_LOG_LOCK(it)      spin_lock_irqsave(&ia64_state_log[it].isl_lock, s)
 367 #define IA64_LOG_UNLOCK(it)    spin_unlock_irqrestore(&ia64_state_log[it].isl_lock,s)
 368 #define IA64_LOG_NEXT_INDEX(it)    ia64_state_log[it].isl_index
 369 #define IA64_LOG_CURR_INDEX(it)    1 - ia64_state_log[it].isl_index
 370 #define IA64_LOG_INDEX_INC(it) \
 371     {ia64_state_log[it].isl_index = 1 - ia64_state_log[it].isl_index; \
 372     ia64_state_log[it].isl_count++;}
 373 #define IA64_LOG_INDEX_DEC(it) \
 374     ia64_state_log[it].isl_index = 1 - ia64_state_log[it].isl_index
 375 #define IA64_LOG_NEXT_BUFFER(it)   (void *)((ia64_state_log[it].isl_log[IA64_LOG_NEXT_INDEX(it)]))
 376 #define IA64_LOG_CURR_BUFFER(it)   (void *)((ia64_state_log[it].isl_log[IA64_LOG_CURR_INDEX(it)]))
 377 #define IA64_LOG_COUNT(it)         ia64_state_log[it].isl_count
 378
 379 /*
 380  * ia64_log_init
 381  *      Reset the OS ia64 log buffer
 382  * Inputs   :   info_type   (SAL_INFO_TYPE_{MCA,INIT,CMC,CPE})
 383  * Outputs      :       None
 384  */
 385 static void __init
 386 ia64_log_init(int sal_info_type)
 387 {
 388         u64     max_size = 0;
 389
 390         IA64_LOG_NEXT_INDEX(sal_info_type) = 0;
 391         IA64_LOG_LOCK_INIT(sal_info_type);
 392
 393         // SAL will tell us the maximum size of any error record of this type
 394         max_size = ia64_sal_get_state_info_size(sal_info_type);
 395         if (!max_size)
 396                 /* alloc_bootmem() doesn't like zero-sized allocations! */
 397                 return;
 398
 399         // set up OS data structures to hold error info
 400         IA64_LOG_ALLOCATE(sal_info_type, max_size);
 401         memset(IA64_LOG_CURR_BUFFER(sal_info_type), 0, max_size);
 402         memset(IA64_LOG_NEXT_BUFFER(sal_info_type), 0, max_size);
 403 }
 404
 405 /*
 406  * ia64_log_get
 407  *
 408  *      Get the current MCA log from SAL and copy it into the OS log buffer.
 409  *
 410  *  Inputs  :   info_type   (SAL_INFO_TYPE_{MCA,INIT,CMC,CPE})
 411  *              irq_safe    whether you can use printk at this point
 412  *  Outputs :   size        (total record length)
 413  *              *buffer     (ptr to error record)
 414  *
 415  */
 416 static u64
 417 ia64_log_get(int sal_info_type, u8 **buffer, int irq_safe)
 418 {
 419         sal_log_record_header_t     *log_buffer;
 420         u64                         total_len = 0;
 421         unsigned long               s;
 422
 423         IA64_LOG_LOCK(sal_info_type);
 424
 425         /* Get the process state information */
 426         log_buffer = IA64_LOG_NEXT_BUFFER(sal_info_type);
 427
 428         total_len = ia64_sal_get_state_info(sal_info_type, (u64 *)log_buffer);
 429
 430         if (total_len) {
 431                 IA64_LOG_INDEX_INC(sal_info_type);
 432                 IA64_LOG_UNLOCK(sal_info_type);
 433                 if (irq_safe) {
 434                         IA64_MCA_DEBUG("%s: SAL error record type %d retrieved. Record length = %ld\n",
 435                                        __func__, sal_info_type, total_len);
 436                 }
 437                 *buffer = (u8 *) log_buffer;
 438                 return total_len;
 439         } else {
 440                 IA64_LOG_UNLOCK(sal_info_type);
 441                 return 0;
 442         }
 443 }
 444
 445 /*
 446  *  ia64_mca_log_sal_error_record
 447  *
 448  *  This function retrieves a specified error record type from SAL
 449  *  and wakes up any processes waiting for error records.
 450  *
 451  *  Inputs  :   sal_info_type   (Type of error record MCA/CMC/CPE)
 452  *              FIXME: remove MCA and irq_safe.
 453  */
 454 static void
 455 ia64_mca_log_sal_error_record(int sal_info_type)
 456 {
 457         u8 *buffer;
 458         sal_log_record_header_t *rh;
 459         u64 size;
 460         int irq_safe = sal_info_type != SAL_INFO_TYPE_MCA;
 461 #ifdef IA64_MCA_DEBUG_INFO
 462         static const char * const rec_name[] = { "MCA", "INIT", "CMC", "CPE" };
 463 #endif
 464
 465         size = ia64_log_get(sal_info_type, &buffer, irq_safe);
 466         if (!size)
 467                 return;
 468
 469         salinfo_log_wakeup(sal_info_type, buffer, size, irq_safe);
 470
 471         if (irq_safe)
 472                 IA64_MCA_DEBUG("CPU %d: SAL log contains %s error record\n",
 473                         smp_processor_id(),
 474                         sal_info_type < ARRAY_SIZE(rec_name) ? rec_name[sal_info_type] : "UNKNOWN");
 475
 476         /* Clear logs from corrected errors in case there's no user-level logger */
 477         rh = (sal_log_record_header_t *)buffer;
 478         if (rh->severity == sal_log_severity_corrected)
 479                 ia64_sal_clear_state_info(sal_info_type);
 480 }
 481
 482 /*
 483  * search_mca_table
 484  *  See if the MCA surfaced in an instruction range
 485  *  that has been tagged as recoverable.
 486  *
 487  *  Inputs
 488  *      first   First address range to check
 489  *      last    Last address range to check
 490  *      ip      Instruction pointer, address we are looking for
 491  *
 492  * Return value:
 493  *      1 on Success (in the table)/ 0 on Failure (not in the  table)
 494  */
 495 int
 496 search_mca_table (const struct mca_table_entry *first,
 497                 const struct mca_table_entry *last,
 498                 unsigned long ip)
 499 {
 500         const struct mca_table_entry *curr;
 501         u64 curr_start, curr_end;
 502
 503         curr = first;
 504         while (curr <= last) {
 505                 curr_start = (u64) &curr->start_addr + curr->start_addr;
 506                 curr_end = (u64) &curr->end_addr + curr->end_addr;
 507
 508                 if ((ip >= curr_start) && (ip <= curr_end)) {
 509                         return 1;
 510                 }
 511                 curr++;
 512         }
 513         return 0;
 514 }
 515
 516 /* Given an address, look for it in the mca tables. */
 517 int mca_recover_range(unsigned long addr)
 518 {
 519         extern struct mca_table_entry __start___mca_table[];
 520         extern struct mca_table_entry __stop___mca_table[];
 521
 522         return search_mca_table(__start___mca_table, __stop___mca_table-1, addr);
 523 }
 524 EXPORT_SYMBOL_GPL(mca_recover_range);
 525
 526 #ifdef CONFIG_ACPI
 527
 528 int cpe_vector = -1;
 529 int ia64_cpe_irq = -1;
 530
 531 static irqreturn_t
 532 ia64_mca_cpe_int_handler (int cpe_irq, void *arg)
 533 {
 534         static unsigned long    cpe_history[CPE_HISTORY_LENGTH];
 535         static int              index;
 536         static DEFINE_SPINLOCK(cpe_history_lock);
 537
 538         IA64_MCA_DEBUG("%s: received interrupt vector = %#x on CPU %d\n",
 539                        __func__, cpe_irq, smp_processor_id());
 540
 541         /* SAL spec states this should run w/ interrupts enabled */
 542         local_irq_enable();
 543
 544         spin_lock(&cpe_history_lock);
 545         if (!cpe_poll_enabled && cpe_vector >= 0) {
 546
 547                 int i, count = 1; /* we know 1 happened now */
 548                 unsigned long now = jiffies;
 549
 550                 for (i = 0; i < CPE_HISTORY_LENGTH; i++) {
 551                         if (now - cpe_history[i] <= HZ)
 552                                 count++;
 553                 }
 554
 555                 IA64_MCA_DEBUG(KERN_INFO "CPE threshold %d/%d\n", count, CPE_HISTORY_LENGTH);
 556                 if (count >= CPE_HISTORY_LENGTH) {
 557
 558                         cpe_poll_enabled = 1;
 559                         spin_unlock(&cpe_history_lock);
 560                         disable_irq_nosync(local_vector_to_irq(IA64_CPE_VECTOR));
 561
 562                         /*
 563                          * Corrected errors will still be corrected, but
 564                          * make sure there's a log somewhere that indicates
 565                          * something is generating more than we can handle.
 566                          */
 567                         printk(KERN_WARNING "WARNING: Switching to polling CPE handler; error records may be lost\n");
 568
 569                         mod_timer(&cpe_poll_timer, jiffies + MIN_CPE_POLL_INTERVAL);
 570
 571                         /* lock already released, get out now */
 572                         goto out;
 573                 } else {
 574                         cpe_history[index++] = now;
 575                         if (index == CPE_HISTORY_LENGTH)
 576                                 index = 0;
 577                 }
 578         }
 579         spin_unlock(&cpe_history_lock);
 580 out:
 581         /* Get the CPE error record and log it */
 582         ia64_mca_log_sal_error_record(SAL_INFO_TYPE_CPE);
 583
 584         return IRQ_HANDLED;
 585 }
 586
 587 #endif /* CONFIG_ACPI */
 588
 589 #ifdef CONFIG_ACPI
 590 /*
 591  * ia64_mca_register_cpev
 592  *
 593  *  Register the corrected platform error vector with SAL.
 594  *
 595  *  Inputs
 596  *      cpev        Corrected Platform Error Vector number
 597  *
 598  *  Outputs
 599  *      None
 600  */
 601 void
 602 ia64_mca_register_cpev (int cpev)
 603 {
 604         /* Register the CPE interrupt vector with SAL */
 605         struct ia64_sal_retval isrv;
 606
 607         isrv = ia64_sal_mc_set_params(SAL_MC_PARAM_CPE_INT, SAL_MC_PARAM_MECHANISM_INT, cpev, 0, 0);
 608         if (isrv.status) {
 609                 printk(KERN_ERR "Failed to register Corrected Platform "
 610                        "Error interrupt vector with SAL (status %ld)\n", isrv.status);
 611                 return;
 612         }
 613
 614         IA64_MCA_DEBUG("%s: corrected platform error "
 615                        "vector %#x registered\n", __func__, cpev);
 616 }
 617 #endif /* CONFIG_ACPI */
 618
 619 /*
 620  * ia64_mca_cmc_vector_setup
 621  *
 622  *  Setup the corrected machine check vector register in the processor.
 623  *  (The interrupt is masked on boot. ia64_mca_late_init unmask this.)
 624  *  This function is invoked on a per-processor basis.
 625  *
 626  * Inputs
 627  *      None
 628  *
 629  * Outputs
 630  *      None
 631  */
 632 void __cpuinit
 633 ia64_mca_cmc_vector_setup (void)
 634 {
 635         cmcv_reg_t      cmcv;
 636
 637         cmcv.cmcv_regval        = 0;
 638         cmcv.cmcv_mask          = 1;        /* Mask/disable interrupt at first */
 639         cmcv.cmcv_vector        = IA64_CMC_VECTOR;
 640         ia64_setreg(_IA64_REG_CR_CMCV, cmcv.cmcv_regval);
 641
 642         IA64_MCA_DEBUG("%s: CPU %d corrected machine check vector %#x registered.\n",
 643                        __func__, smp_processor_id(), IA64_CMC_VECTOR);
 644
 645         IA64_MCA_DEBUG("%s: CPU %d CMCV = %#016lx\n",
 646                        __func__, smp_processor_id(), ia64_getreg(_IA64_REG_CR_CMCV));
 647 }
 648
 649 /*
 650  * ia64_mca_cmc_vector_disable
 651  *
 652  *  Mask the corrected machine check vector register in the processor.
 653  *  This function is invoked on a per-processor basis.
 654  *
 655  * Inputs
 656  *      dummy(unused)
 657  *
 658  * Outputs
 659  *      None
 660  */
 661 static void
 662 ia64_mca_cmc_vector_disable (void *dummy)
 663 {
 664         cmcv_reg_t      cmcv;
 665
 666         cmcv.cmcv_regval = ia64_getreg(_IA64_REG_CR_CMCV);
 667
 668         cmcv.cmcv_mask = 1; /* Mask/disable interrupt */
 669         ia64_setreg(_IA64_REG_CR_CMCV, cmcv.cmcv_regval);
 670
 671         IA64_MCA_DEBUG("%s: CPU %d corrected machine check vector %#x disabled.\n",
 672                        __func__, smp_processor_id(), cmcv.cmcv_vector);
 673 }
 674
 675 /*
 676  * ia64_mca_cmc_vector_enable
 677  *
 678  *  Unmask the corrected machine check vector register in the processor.
 679  *  This function is invoked on a per-processor basis.
 680  *
 681  * Inputs
 682  *      dummy(unused)
 683  *
 684  * Outputs
 685  *      None
 686  */
 687 static void
 688 ia64_mca_cmc_vector_enable (void *dummy)
 689 {
 690         cmcv_reg_t      cmcv;
 691
 692         cmcv.cmcv_regval = ia64_getreg(_IA64_REG_CR_CMCV);
 693
 694         cmcv.cmcv_mask = 0; /* Unmask/enable interrupt */
 695         ia64_setreg(_IA64_REG_CR_CMCV, cmcv.cmcv_regval);
 696
 697         IA64_MCA_DEBUG("%s: CPU %d corrected machine check vector %#x enabled.\n",
 698                        __func__, smp_processor_id(), cmcv.cmcv_vector);
 699 }
 700
 701 /*
 702  * ia64_mca_cmc_vector_disable_keventd
 703  *
 704  * Called via keventd (smp_call_function() is not safe in interrupt context) to
 705  * disable the cmc interrupt vector.
 706  */
 707 static void
 708 ia64_mca_cmc_vector_disable_keventd(struct work_struct *unused)
 709 {
 710         on_each_cpu(ia64_mca_cmc_vector_disable, NULL, 0);
 711 }
 712
 713 /*
 714  * ia64_mca_cmc_vector_enable_keventd
 715  *
 716  * Called via keventd (smp_call_function() is not safe in interrupt context) to
 717  * enable the cmc interrupt vector.
 718  */
 719 static void
 720 ia64_mca_cmc_vector_enable_keventd(struct work_struct *unused)
 721 {
 722         on_each_cpu(ia64_mca_cmc_vector_enable, NULL, 0);
 723 }
 724
 725 /*
 726  * ia64_mca_wakeup
 727  *
 728  *      Send an inter-cpu interrupt to wake-up a particular cpu.
 729  *
 730  *  Inputs  :   cpuid
 731  *  Outputs :   None
 732  */
 733 static void
 734 ia64_mca_wakeup(int cpu)
 735 {
 736         platform_send_ipi(cpu, IA64_MCA_WAKEUP_VECTOR, IA64_IPI_DM_INT, 0);
 737 }
 738
 739 /*
 740  * ia64_mca_wakeup_all
 741  *
 742  *      Wakeup all the slave cpus which have rendez'ed previously.
 743  *
 744  *  Inputs  :   None
 745  *  Outputs :   None
 746  */
 747 static void
 748 ia64_mca_wakeup_all(void)
 749 {
 750         int cpu;
 751
 752         /* Clear the Rendez checkin flag for all cpus */
 753         for_each_online_cpu(cpu) {
 754                 if (ia64_mc_info.imi_rendez_checkin[cpu] == IA64_MCA_RENDEZ_CHECKIN_DONE)
 755                         ia64_mca_wakeup(cpu);
 756         }
 757
 758 }
 759
 760 /*
 761  * ia64_mca_rendez_interrupt_handler
 762  *
 763  *      This is handler used to put slave processors into spinloop
 764  *      while the monarch processor does the mca handling and later
 765  *      wake each slave up once the monarch is done.  The state
 766  *      IA64_MCA_RENDEZ_CHECKIN_DONE indicates the cpu is rendez'ed
 767  *      in SAL.  The state IA64_MCA_RENDEZ_CHECKIN_NOTDONE indicates
 768  *      the cpu has come out of OS rendezvous.
 769  *
 770  *  Inputs  :   None
 771  *  Outputs :   None
 772  */
 773 static irqreturn_t
 774 ia64_mca_rendez_int_handler(int rendez_irq, void *arg)
 775 {
 776         unsigned long flags;
 777         int cpu = smp_processor_id();
 778         struct ia64_mca_notify_die nd =
 779                 { .sos = NULL, .monarch_cpu = &monarch_cpu };
 780
 781         /* Mask all interrupts */
 782         local_irq_save(flags);
 783
 784         NOTIFY_MCA(DIE_MCA_RENDZVOUS_ENTER, get_irq_regs(), (long)&nd, 1);
 785
 786         ia64_mc_info.imi_rendez_checkin[cpu] = IA64_MCA_RENDEZ_CHECKIN_DONE;
 787         /* Register with the SAL monarch that the slave has
 788          * reached SAL
 789          */
 790         ia64_sal_mc_rendez();
 791
 792         NOTIFY_MCA(DIE_MCA_RENDZVOUS_PROCESS, get_irq_regs(), (long)&nd, 1);
 793
 794         /* Wait for the monarch cpu to exit. */
 795         while (monarch_cpu != -1)
 796                cpu_relax();     /* spin until monarch leaves */
 797
 798         NOTIFY_MCA(DIE_MCA_RENDZVOUS_LEAVE, get_irq_regs(), (long)&nd, 1);
 799
 800         ia64_mc_info.imi_rendez_checkin[cpu] = IA64_MCA_RENDEZ_CHECKIN_NOTDONE;
 801         /* Enable all interrupts */
 802         local_irq_restore(flags);
 803         return IRQ_HANDLED;
 804 }
 805
 806 /*
 807  * ia64_mca_wakeup_int_handler
 808  *
 809  *      The interrupt handler for processing the inter-cpu interrupt to the
 810  *      slave cpu which was spinning in the rendez loop.
 811  *      Since this spinning is done by turning off the interrupts and
 812  *      polling on the wakeup-interrupt bit in the IRR, there is
 813  *      nothing useful to be done in the handler.
 814  *
 815  *  Inputs  :   wakeup_irq  (Wakeup-interrupt bit)
 816  *      arg             (Interrupt handler specific argument)
 817  *  Outputs :   None
 818  *
 819  */
 820 static irqreturn_t
 821 ia64_mca_wakeup_int_handler(int wakeup_irq, void *arg)
 822 {
 823         return IRQ_HANDLED;
 824 }
 825
 826 /* Function pointer for extra MCA recovery */
 827 int (*ia64_mca_ucmc_extension)
 828         (void*,struct ia64_sal_os_state*)
 829         = NULL;
 830
 831 int
 832 ia64_reg_MCA_extension(int (*fn)(void *, struct ia64_sal_os_state *))
 833 {
 834         if (ia64_mca_ucmc_extension)
 835                 return 1;
 836
 837         ia64_mca_ucmc_extension = fn;
 838         return 0;
 839 }
 840
 841 void
 842 ia64_unreg_MCA_extension(void)
 843 {
 844         if (ia64_mca_ucmc_extension)
 845                 ia64_mca_ucmc_extension = NULL;
 846 }
 847
 848 EXPORT_SYMBOL(ia64_reg_MCA_extension);
 849 EXPORT_SYMBOL(ia64_unreg_MCA_extension);
 850
 851
 852 static inline void
 853 copy_reg(const u64 *fr, u64 fnat, unsigned long *tr, unsigned long *tnat)
 854 {
 855         u64 fslot, tslot, nat;
 856         *tr = *fr;
 857         fslot = ((unsigned long)fr >> 3) & 63;
 858         tslot = ((unsigned long)tr >> 3) & 63;
 859         *tnat &= ~(1UL << tslot);
 860         nat = (fnat >> fslot) & 1;
 861         *tnat |= (nat << tslot);
 862 }
 863
 864 /* Change the comm field on the MCA/INT task to include the pid that
 865  * was interrupted, it makes for easier debugging.  If that pid was 0
 866  * (swapper or nested MCA/INIT) then use the start of the previous comm
 867  * field suffixed with its cpu.
 868  */
 869
 870 static void
 871 ia64_mca_modify_comm(const struct task_struct *previous_current)
 872 {
 873         char *p, comm[sizeof(current->comm)];
 874         if (previous_current->pid)
 875                 snprintf(comm, sizeof(comm), "%s %d",
 876                         current->comm, previous_current->pid);
 877         else {
 878                 int l;
 879                 if ((p = strchr(previous_current->comm, ' ')))
 880                         l = p - previous_current->comm;
 881                 else
 882                         l = strlen(previous_current->comm);
 883                 snprintf(comm, sizeof(comm), "%s %*s %d",
 884                         current->comm, l, previous_current->comm,
 885                         task_thread_info(previous_current)->cpu);
 886         }
 887         memcpy(current->comm, comm, sizeof(current->comm));
 888 }
 889
 890 static void
 891 finish_pt_regs(struct pt_regs *regs, struct ia64_sal_os_state *sos,
 892                 unsigned long *nat)
 893 {
 894         const pal_min_state_area_t *ms = sos->pal_min_state;
 895         const u64 *bank;
 896
 897         /* If ipsr.ic then use pmsa_{iip,ipsr,ifs}, else use
 898          * pmsa_{xip,xpsr,xfs}
 899          */
 900         if (ia64_psr(regs)->ic) {
 901                 regs->cr_iip = ms->pmsa_iip;
 902                 regs->cr_ipsr = ms->pmsa_ipsr;
 903                 regs->cr_ifs = ms->pmsa_ifs;
 904         } else {
 905                 regs->cr_iip = ms->pmsa_xip;
 906                 regs->cr_ipsr = ms->pmsa_xpsr;
 907                 regs->cr_ifs = ms->pmsa_xfs;
 908
 909                 sos->iip = ms->pmsa_iip;
 910                 sos->ipsr = ms->pmsa_ipsr;
 911                 sos->ifs = ms->pmsa_ifs;
 912         }
 913         regs->pr = ms->pmsa_pr;
 914         regs->b0 = ms->pmsa_br0;
 915         regs->ar_rsc = ms->pmsa_rsc;
 916         copy_reg(&ms->pmsa_gr[1-1], ms->pmsa_nat_bits, &regs->r1, nat);
 917         copy_reg(&ms->pmsa_gr[2-1], ms->pmsa_nat_bits, &regs->r2, nat);
 918         copy_reg(&ms->pmsa_gr[3-1], ms->pmsa_nat_bits, &regs->r3, nat);
 919         copy_reg(&ms->pmsa_gr[8-1], ms->pmsa_nat_bits, &regs->r8, nat);
 920         copy_reg(&ms->pmsa_gr[9-1], ms->pmsa_nat_bits, &regs->r9, nat);
 921         copy_reg(&ms->pmsa_gr[10-1], ms->pmsa_nat_bits, &regs->r10, nat);
 922         copy_reg(&ms->pmsa_gr[11-1], ms->pmsa_nat_bits, &regs->r11, nat);
 923         copy_reg(&ms->pmsa_gr[12-1], ms->pmsa_nat_bits, &regs->r12, nat);
 924         copy_reg(&ms->pmsa_gr[13-1], ms->pmsa_nat_bits, &regs->r13, nat);
 925         copy_reg(&ms->pmsa_gr[14-1], ms->pmsa_nat_bits, &regs->r14, nat);
 926         copy_reg(&ms->pmsa_gr[15-1], ms->pmsa_nat_bits, &regs->r15, nat);
 927         if (ia64_psr(regs)->bn)
 928                 bank = ms->pmsa_bank1_gr;
 929         else
 930                 bank = ms->pmsa_bank0_gr;
 931         copy_reg(&bank[16-16], ms->pmsa_nat_bits, &regs->r16, nat);
 932         copy_reg(&bank[17-16], ms->pmsa_nat_bits, &regs->r17, nat);
 933         copy_reg(&bank[18-16], ms->pmsa_nat_bits, &regs->r18, nat);
 934         copy_reg(&bank[19-16], ms->pmsa_nat_bits, &regs->r19, nat);
 935         copy_reg(&bank[20-16], ms->pmsa_nat_bits, &regs->r20, nat);
 936         copy_reg(&bank[21-16], ms->pmsa_nat_bits, &regs->r21, nat);
 937         copy_reg(&bank[22-16], ms->pmsa_nat_bits, &regs->r22, nat);
 938         copy_reg(&bank[23-16], ms->pmsa_nat_bits, &regs->r23, nat);
 939         copy_reg(&bank[24-16], ms->pmsa_nat_bits, &regs->r24, nat);
 940         copy_reg(&bank[25-16], ms->pmsa_nat_bits, &regs->r25, nat);
 941         copy_reg(&bank[26-16], ms->pmsa_nat_bits, &regs->r26, nat);
 942         copy_reg(&bank[27-16], ms->pmsa_nat_bits, &regs->r27, nat);
 943         copy_reg(&bank[28-16], ms->pmsa_nat_bits, &regs->r28, nat);
 944         copy_reg(&bank[29-16], ms->pmsa_nat_bits, &regs->r29, nat);
 945         copy_reg(&bank[30-16], ms->pmsa_nat_bits, &regs->r30, nat);
 946         copy_reg(&bank[31-16], ms->pmsa_nat_bits, &regs->r31, nat);
 947 }
 948
 949 /* On entry to this routine, we are running on the per cpu stack, see
 950  * mca_asm.h.  The original stack has not been touched by this event.  Some of
 951  * the original stack's registers will be in the RBS on this stack.  This stack
 952  * also contains a partial pt_regs and switch_stack, the rest of the data is in
 953  * PAL minstate.
 954  *
 955  * The first thing to do is modify the original stack to look like a blocked
 956  * task so we can run backtrace on the original task.  Also mark the per cpu
 957  * stack as current to ensure that we use the correct task state, it also means
 958  * that we can do backtrace on the MCA/INIT handler code itself.
 959  */
 960
 961 static struct task_struct *
 962 ia64_mca_modify_original_stack(struct pt_regs *regs,
 963                 const struct switch_stack *sw,
 964                 struct ia64_sal_os_state *sos,
 965                 const char *type)
 966 {
 967         char *p;
 968         ia64_va va;
 969         extern char ia64_leave_kernel[];        /* Need asm address, not function descriptor */
 970         const pal_min_state_area_t *ms = sos->pal_min_state;
 971         struct task_struct *previous_current;
 972         struct pt_regs *old_regs;
 973         struct switch_stack *old_sw;
 974         unsigned size = sizeof(struct pt_regs) +
 975                         sizeof(struct switch_stack) + 16;
 976         unsigned long *old_bspstore, *old_bsp;
 977         unsigned long *new_bspstore, *new_bsp;
 978         unsigned long old_unat, old_rnat, new_rnat, nat;
 979         u64 slots, loadrs = regs->loadrs;
 980         u64 r12 = ms->pmsa_gr[12-1], r13 = ms->pmsa_gr[13-1];
 981         u64 ar_bspstore = regs->ar_bspstore;
 982         u64 ar_bsp = regs->ar_bspstore + (loadrs >> 16);
 983         const char *msg;
 984         int cpu = smp_processor_id();
 985
 986         previous_current = curr_task(cpu);
 987         set_curr_task(cpu, current);
 988         if ((p = strchr(current->comm, ' ')))
 989                 *p = '\0';
 990
 991         /* Best effort attempt to cope with MCA/INIT delivered while in
 992          * physical mode.
 993          */
 994         regs->cr_ipsr = ms->pmsa_ipsr;
 995         if (ia64_psr(regs)->dt == 0) {
 996                 va.l = r12;
 997                 if (va.f.reg == 0) {
 998                         va.f.reg = 7;
 999                         r12 = va.l;
1000                 }
1001                 va.l = r13;
1002                 if (va.f.reg == 0) {
1003                         va.f.reg = 7;
1004                         r13 = va.l;
1005                 }
1006         }
1007         if (ia64_psr(regs)->rt == 0) {
1008                 va.l = ar_bspstore;
1009                 if (va.f.reg == 0) {
1010                         va.f.reg = 7;
1011                         ar_bspstore = va.l;
1012                 }
1013                 va.l = ar_bsp;
1014                 if (va.f.reg == 0) {
1015                         va.f.reg = 7;
1016                         ar_bsp = va.l;
1017                 }
1018         }
1019
1020         /* mca_asm.S ia64_old_stack() cannot assume that the dirty registers
1021          * have been copied to the old stack, the old stack may fail the
1022          * validation tests below.  So ia64_old_stack() must restore the dirty
1023          * registers from the new stack.  The old and new bspstore probably
1024          * have different alignments, so loadrs calculated on the old bsp
1025          * cannot be used to restore from the new bsp.  Calculate a suitable
1026          * loadrs for the new stack and save it in the new pt_regs, where
1027          * ia64_old_stack() can get it.
1028          */
1029         old_bspstore = (unsigned long *)ar_bspstore;
1030         old_bsp = (unsigned long *)ar_bsp;
1031         slots = ia64_rse_num_regs(old_bspstore, old_bsp);
1032         new_bspstore = (unsigned long *)((u64)current + IA64_RBS_OFFSET);
1033         new_bsp = ia64_rse_skip_regs(new_bspstore, slots);
1034         regs->loadrs = (new_bsp - new_bspstore) * 8 << 16;
1035
1036         /* Verify the previous stack state before we change it */
1037         if (user_mode(regs)) {
1038                 msg = "occurred in user space";
1039                 /* previous_current is guaranteed to be valid when the task was
1040                  * in user space, so ...
1041                  */
1042                 ia64_mca_modify_comm(previous_current);
1043                 goto no_mod;
1044         }
1045
1046         if (r13 != sos->prev_IA64_KR_CURRENT) {
1047                 msg = "inconsistent previous current and r13";
1048                 goto no_mod;
1049         }
1050
1051         if (!mca_recover_range(ms->pmsa_iip)) {
1052                 if ((r12 - r13) >= KERNEL_STACK_SIZE) {
1053                         msg = "inconsistent r12 and r13";
1054                         goto no_mod;
1055                 }
1056                 if ((ar_bspstore - r13) >= KERNEL_STACK_SIZE) {
1057                         msg = "inconsistent ar.bspstore and r13";
1058                         goto no_mod;
1059                 }
1060                 va.p = old_bspstore;
1061                 if (va.f.reg < 5) {
1062                         msg = "old_bspstore is in the wrong region";
1063                         goto no_mod;
1064                 }
1065                 if ((ar_bsp - r13) >= KERNEL_STACK_SIZE) {
1066                         msg = "inconsistent ar.bsp and r13";
1067                         goto no_mod;
1068                 }
1069                 size += (ia64_rse_skip_regs(old_bspstore, slots) - old_bspstore) * 8;
1070                 if (ar_bspstore + size > r12) {
1071                         msg = "no room for blocked state";
1072                         goto no_mod;
1073                 }
1074         }
1075
1076         ia64_mca_modify_comm(previous_current);
1077
1078         /* Make the original task look blocked.  First stack a struct pt_regs,
1079          * describing the state at the time of interrupt.  mca_asm.S built a
1080          * partial pt_regs, copy it and fill in the blanks using minstate.
1081          */
1082         p = (char *)r12 - sizeof(*regs);
1083         old_regs = (struct pt_regs *)p;
1084         memcpy(old_regs, regs, sizeof(*regs));
1085         old_regs->loadrs = loadrs;
1086         old_unat = old_regs->ar_unat;
1087         finish_pt_regs(old_regs, sos, &old_unat);
1088
1089         /* Next stack a struct switch_stack.  mca_asm.S built a partial
1090          * switch_stack, copy it and fill in the blanks using pt_regs and
1091          * minstate.
1092          *
1093          * In the synthesized switch_stack, b0 points to ia64_leave_kernel,
1094          * ar.pfs is set to 0.
1095          *
1096          * unwind.c::unw_unwind() does special processing for interrupt frames.
1097          * It checks if the PRED_NON_SYSCALL predicate is set, if the predicate
1098          * is clear then unw_unwind() does _not_ adjust bsp over pt_regs.  Not
1099          * that this is documented, of course.  Set PRED_NON_SYSCALL in the
1100          * switch_stack on the original stack so it will unwind correctly when
1101          * unwind.c reads pt_regs.
1102          *
1103          * thread.ksp is updated to point to the synthesized switch_stack.
1104          */
1105         p -= sizeof(struct switch_stack);
1106         old_sw = (struct switch_stack *)p;
1107         memcpy(old_sw, sw, sizeof(*sw));
1108         old_sw->caller_unat = old_unat;
1109         old_sw->ar_fpsr = old_regs->ar_fpsr;
1110         copy_reg(&ms->pmsa_gr[4-1], ms->pmsa_nat_bits, &old_sw->r4, &old_unat);
1111         copy_reg(&ms->pmsa_gr[5-1], ms->pmsa_nat_bits, &old_sw->r5, &old_unat);
1112         copy_reg(&ms->pmsa_gr[6-1], ms->pmsa_nat_bits, &old_sw->r6, &old_unat);
1113         copy_reg(&ms->pmsa_gr[7-1], ms->pmsa_nat_bits, &old_sw->r7, &old_unat);
1114         old_sw->b0 = (u64)ia64_leave_kernel;
1115         old_sw->b1 = ms->pmsa_br1;
1116         old_sw->ar_pfs = 0;
1117         old_sw->ar_unat = old_unat;
1118         old_sw->pr = old_regs->pr | (1UL << PRED_NON_SYSCALL);
1119         previous_current->thread.ksp = (u64)p - 16;
1120
1121         /* Finally copy the original stack's registers back to its RBS.
1122          * Registers from ar.bspstore through ar.bsp at the time of the event
1123          * are in the current RBS, copy them back to the original stack.  The
1124          * copy must be done register by register because the original bspstore
1125          * and the current one have different alignments, so the saved RNAT
1126          * data occurs at different places.
1127          *
1128          * mca_asm does cover, so the old_bsp already includes all registers at
1129          * the time of MCA/INIT.  It also does flushrs, so all registers before
1130          * this function have been written to backing store on the MCA/INIT
1131          * stack.
1132          */
1133         new_rnat = ia64_get_rnat(ia64_rse_rnat_addr(new_bspstore));
1134         old_rnat = regs->ar_rnat;
1135         while (slots--) {
1136                 if (ia64_rse_is_rnat_slot(new_bspstore)) {
1137                         new_rnat = ia64_get_rnat(new_bspstore++);
1138                 }
1139                 if (ia64_rse_is_rnat_slot(old_bspstore)) {
1140                         *old_bspstore++ = old_rnat;
1141                         old_rnat = 0;
1142                 }
1143                 nat = (new_rnat >> ia64_rse_slot_num(new_bspstore)) & 1UL;
1144                 old_rnat &= ~(1UL << ia64_rse_slot_num(old_bspstore));
1145                 old_rnat |= (nat << ia64_rse_slot_num(old_bspstore));
1146                 *old_bspstore++ = *new_bspstore++;
1147         }
1148         old_sw->ar_bspstore = (unsigned long)old_bspstore;
1149         old_sw->ar_rnat = old_rnat;
1150
1151         sos->prev_task = previous_current;
1152         return previous_current;
1153
1154 no_mod:
1155         mprintk(KERN_INFO "cpu %d, %s %s, original stack not modified\n",
1156                         smp_processor_id(), type, msg);
1157         old_unat = regs->ar_unat;
1158         finish_pt_regs(regs, sos, &old_unat);
1159         return previous_current;
1160 }
1161
1162 /* The monarch/slave interaction is based on monarch_cpu and requires that all
1163  * slaves have entered rendezvous before the monarch leaves.  If any cpu has
1164  * not entered rendezvous yet then wait a bit.  The assumption is that any
1165  * slave that has not rendezvoused after a reasonable time is never going to do
1166  * so.  In this context, slave includes cpus that respond to the MCA rendezvous
1167  * interrupt, as well as cpus that receive the INIT slave event.
1168  */
1169
1170 static void
1171 ia64_wait_for_slaves(int monarch, const char *type)
1172 {
1173         int c, i , wait;
1174
1175         /*
1176          * wait 5 seconds total for slaves (arbitrary)
1177          */
1178         for (i = 0; i < 5000; i++) {
1179                 wait = 0;
1180                 for_each_online_cpu(c) {
1181                         if (c == monarch)
1182                                 continue;
1183                         if (ia64_mc_info.imi_rendez_checkin[c]
1184                                         == IA64_MCA_RENDEZ_CHECKIN_NOTDONE) {
1185                                 udelay(1000);           /* short wait */
1186                                 wait = 1;
1187                                 break;
1188                         }
1189                 }
1190                 if (!wait)
1191                         goto all_in;
1192         }
1193
1194         /*
1195          * Maybe slave(s) dead. Print buffered messages immediately.
1196          */
1197         ia64_mlogbuf_finish(0);
1198         mprintk(KERN_INFO "OS %s slave did not rendezvous on cpu", type);
1199         for_each_online_cpu(c) {
1200                 if (c == monarch)
1201                         continue;
1202                 if (ia64_mc_info.imi_rendez_checkin[c] == IA64_MCA_RENDEZ_CHECKIN_NOTDONE)
1203                         mprintk(" %d", c);
1204         }
1205         mprintk("\n");
1206         return;
1207
1208 all_in:
1209         mprintk(KERN_INFO "All OS %s slaves have reached rendezvous\n", type);
1210         return;
1211 }
1212
1213 /*  mca_insert_tr
1214  *
1215  *  Switch rid when TR reload and needed!
1216  *  iord: 1: itr, 2: itr;
1217  *
1218 */
1219 static void mca_insert_tr(u64 iord)
1220 {
1221
1222         int i;
1223         u64 old_rr;
1224         struct ia64_tr_entry *p;
1225         unsigned long psr;
1226         int cpu = smp_processor_id();
1227
1228         if (!ia64_idtrs[cpu])
1229                 return;
1230
1231         psr = ia64_clear_ic();
1232         for (i = IA64_TR_ALLOC_BASE; i < IA64_TR_ALLOC_MAX; i++) {
1233                 p = ia64_idtrs[cpu] + (iord - 1) * IA64_TR_ALLOC_MAX;
1234                 if (p->pte & 0x1) {
1235                         old_rr = ia64_get_rr(p->ifa);
1236                         if (old_rr != p->rr) {
1237                                 ia64_set_rr(p->ifa, p->rr);
1238                                 ia64_srlz_d();
1239                         }
1240                         ia64_ptr(iord, p->ifa, p->itir >> 2);
1241                         ia64_srlz_i();
1242                         if (iord & 0x1) {
1243                                 ia64_itr(0x1, i, p->ifa, p->pte, p->itir >> 2);
1244                                 ia64_srlz_i();
1245                         }
1246                         if (iord & 0x2) {
1247                                 ia64_itr(0x2, i, p->ifa, p->pte, p->itir >> 2);
1248                                 ia64_srlz_i();
1249                         }
1250                         if (old_rr != p->rr) {
1251                                 ia64_set_rr(p->ifa, old_rr);
1252                                 ia64_srlz_d();
1253                         }
1254                 }
1255         }
1256         ia64_set_psr(psr);
1257 }
1258
1259 /*
1260  * ia64_mca_handler
1261  *
1262  *      This is uncorrectable machine check handler called from OS_MCA
1263  *      dispatch code which is in turn called from SAL_CHECK().
1264  *      This is the place where the core of OS MCA handling is done.
1265  *      Right now the logs are extracted and displayed in a well-defined
1266  *      format. This handler code is supposed to be run only on the
1267  *      monarch processor. Once the monarch is done with MCA handling
1268  *      further MCA logging is enabled by clearing logs.
1269  *      Monarch also has the duty of sending wakeup-IPIs to pull the
1270  *      slave processors out of rendezvous spinloop.
1271  *
1272  *      If multiple processors call into OS_MCA, the first will become
1273  *      the monarch.  Subsequent cpus will be recorded in the mca_cpu
1274  *      bitmask.  After the first monarch has processed its MCA, it
1275  *      will wake up the next cpu in the mca_cpu bitmask and then go
1276  *      into the rendezvous loop.  When all processors have serviced
1277  *      their MCA, the last monarch frees up the rest of the processors.
1278  */
1279 void
1280 ia64_mca_handler(struct pt_regs *regs, struct switch_stack *sw,
1281                  struct ia64_sal_os_state *sos)
1282 {
1283         int recover, cpu = smp_processor_id();
1284         struct task_struct *previous_current;
1285         struct ia64_mca_notify_die nd =
1286                 { .sos = sos, .monarch_cpu = &monarch_cpu, .data = &recover };
1287         static atomic_t mca_count;
1288         static cpumask_t mca_cpu;
1289
1290         if (atomic_add_return(1, &mca_count) == 1) {
1291                 monarch_cpu = cpu;
1292                 sos->monarch = 1;
1293         } else {
1294                 cpu_set(cpu, mca_cpu);
1295                 sos->monarch = 0;
1296         }
1297         mprintk(KERN_INFO "Entered OS MCA handler. PSP=%lx cpu=%d "
1298                 "monarch=%ld\n", sos->proc_state_param, cpu, sos->monarch);
1299
1300         previous_current = ia64_mca_modify_original_stack(regs, sw, sos, "MCA");
1301
1302         NOTIFY_MCA(DIE_MCA_MONARCH_ENTER, regs, (long)&nd, 1);
1303
1304         ia64_mc_info.imi_rendez_checkin[cpu] = IA64_MCA_RENDEZ_CHECKIN_CONCURRENT_MCA;
1305         if (sos->monarch) {
1306                 ia64_wait_for_slaves(cpu, "MCA");
1307
1308                 /* Wakeup all the processors which are spinning in the
1309                  * rendezvous loop.  They will leave SAL, then spin in the OS
1310                  * with interrupts disabled until this monarch cpu leaves the
1311                  * MCA handler.  That gets control back to the OS so we can
1312                  * backtrace the other cpus, backtrace when spinning in SAL
1313                  * does not work.
1314                  */
1315                 ia64_mca_wakeup_all();
1316         } else {
1317                 while (cpu_isset(cpu, mca_cpu))
1318                         cpu_relax();    /* spin until monarch wakes us */
1319         }
1320
1321         NOTIFY_MCA(DIE_MCA_MONARCH_PROCESS, regs, (long)&nd, 1);
1322
1323         /* Get the MCA error record and log it */
1324         ia64_mca_log_sal_error_record(SAL_INFO_TYPE_MCA);
1325
1326         /* MCA error recovery */
1327         recover = (ia64_mca_ucmc_extension
1328                 && ia64_mca_ucmc_extension(
1329                         IA64_LOG_CURR_BUFFER(SAL_INFO_TYPE_MCA),
1330                         sos));
1331
1332         if (recover) {
1333                 sal_log_record_header_t *rh = IA64_LOG_CURR_BUFFER(SAL_INFO_TYPE_MCA);
1334                 rh->severity = sal_log_severity_corrected;
1335                 ia64_sal_clear_state_info(SAL_INFO_TYPE_MCA);
1336                 sos->os_status = IA64_MCA_CORRECTED;
1337         } else {
1338                 /* Dump buffered message to console */
1339                 ia64_mlogbuf_finish(1);
1340         }
1341
1342         if (__get_cpu_var(ia64_mca_tr_reload)) {
1343                 mca_insert_tr(0x1); /*Reload dynamic itrs*/
1344                 mca_insert_tr(0x2); /*Reload dynamic itrs*/
1345         }
1346
1347         NOTIFY_MCA(DIE_MCA_MONARCH_LEAVE, regs, (long)&nd, 1);
1348
1349         if (atomic_dec_return(&mca_count) > 0) {
1350                 int i;
1351
1352                 /* wake up the next monarch cpu,
1353                  * and put this cpu in the rendez loop.
1354                  */
1355                 for_each_online_cpu(i) {
1356                         if (cpu_isset(i, mca_cpu)) {
1357                                 monarch_cpu = i;
1358                                 cpu_clear(i, mca_cpu);  /* wake next cpu */
1359                                 while (monarch_cpu != -1)
1360                                         cpu_relax();    /* spin until last cpu leaves */
1361                                 set_curr_task(cpu, previous_current);
1362                                 ia64_mc_info.imi_rendez_checkin[cpu]
1363                                                 = IA64_MCA_RENDEZ_CHECKIN_NOTDONE;
1364                                 return;
1365                         }
1366                 }
1367         }
1368         set_curr_task(cpu, previous_current);
1369         ia64_mc_info.imi_rendez_checkin[cpu] = IA64_MCA_RENDEZ_CHECKIN_NOTDONE;
1370         monarch_cpu = -1;       /* This frees the slaves and previous monarchs */
1371 }
1372
1373 static DECLARE_WORK(cmc_disable_work, ia64_mca_cmc_vector_disable_keventd);
1374 static DECLARE_WORK(cmc_enable_work, ia64_mca_cmc_vector_enable_keventd);
1375
1376 /*
1377  * ia64_mca_cmc_int_handler
1378  *
1379  *  This is corrected machine check interrupt handler.
1380  *      Right now the logs are extracted and displayed in a well-defined
1381  *      format.
1382  *
1383  * Inputs
1384  *      interrupt number
1385  *      client data arg ptr
1386  *
1387  * Outputs
1388  *      None
1389  */
1390 static irqreturn_t
1391 ia64_mca_cmc_int_handler(int cmc_irq, void *arg)
1392 {
1393         static unsigned long    cmc_history[CMC_HISTORY_LENGTH];
1394         static int              index;
1395         static DEFINE_SPINLOCK(cmc_history_lock);
1396
1397         IA64_MCA_DEBUG("%s: received interrupt vector = %#x on CPU %d\n",
1398                        __func__, cmc_irq, smp_processor_id());
1399
1400         /* SAL spec states this should run w/ interrupts enabled */
1401         local_irq_enable();
1402
1403         spin_lock(&cmc_history_lock);
1404         if (!cmc_polling_enabled) {
1405                 int i, count = 1; /* we know 1 happened now */
1406                 unsigned long now = jiffies;
1407
1408                 for (i = 0; i < CMC_HISTORY_LENGTH; i++) {
1409                         if (now - cmc_history[i] <= HZ)
1410                                 count++;
1411                 }
1412
1413                 IA64_MCA_DEBUG(KERN_INFO "CMC threshold %d/%d\n", count, CMC_HISTORY_LENGTH);
1414                 if (count >= CMC_HISTORY_LENGTH) {
1415
1416                         cmc_polling_enabled = 1;
1417                         spin_unlock(&cmc_history_lock);
1418                         /* If we're being hit with CMC interrupts, we won't
1419                          * ever execute the schedule_work() below.  Need to
1420                          * disable CMC interrupts on this processor now.
1421                          */
1422                         ia64_mca_cmc_vector_disable(NULL);
1423                         schedule_work(&cmc_disable_work);
1424
1425                         /*
1426                          * Corrected errors will still be corrected, but
1427                          * make sure there's a log somewhere that indicates
1428                          * something is generating more than we can handle.
1429                          */
1430                         printk(KERN_WARNING "WARNING: Switching to polling CMC handler; error records may be lost\n");
1431
1432                         mod_timer(&cmc_poll_timer, jiffies + CMC_POLL_INTERVAL);
1433
1434                         /* lock already released, get out now */
1435                         goto out;
1436                 } else {
1437                         cmc_history[index++] = now;
1438                         if (index == CMC_HISTORY_LENGTH)
1439                                 index = 0;
1440                 }
1441         }
1442         spin_unlock(&cmc_history_lock);
1443 out:
1444         /* Get the CMC error record and log it */
1445         ia64_mca_log_sal_error_record(SAL_INFO_TYPE_CMC);
1446
1447         return IRQ_HANDLED;
1448 }
1449
1450 /*
1451  *  ia64_mca_cmc_int_caller
1452  *
1453  *      Triggered by sw interrupt from CMC polling routine.  Calls
1454  *      real interrupt handler and either triggers a sw interrupt
1455  *      on the next cpu or does cleanup at the end.
1456  *
1457  * Inputs
1458  *      interrupt number
1459  *      client data arg ptr
1460  * Outputs
1461  *      handled
1462  */
1463 static irqreturn_t
1464 ia64_mca_cmc_int_caller(int cmc_irq, void *arg)
1465 {
1466         static int start_count = -1;
1467         unsigned int cpuid;
1468
1469         cpuid = smp_processor_id();
1470
1471         /* If first cpu, update count */
1472         if (start_count == -1)
1473                 start_count = IA64_LOG_COUNT(SAL_INFO_TYPE_CMC);
1474
1475         ia64_mca_cmc_int_handler(cmc_irq, arg);
1476
1477         cpuid = cpumask_next(cpuid+1, cpu_online_mask);
1478
1479         if (cpuid < nr_cpu_ids) {
1480                 platform_send_ipi(cpuid, IA64_CMCP_VECTOR, IA64_IPI_DM_INT, 0);
1481         } else {
1482                 /* If no log record, switch out of polling mode */
1483                 if (start_count == IA64_LOG_COUNT(SAL_INFO_TYPE_CMC)) {
1484
1485                         printk(KERN_WARNING "Returning to interrupt driven CMC handler\n");
1486                         schedule_work(&cmc_enable_work);
1487                         cmc_polling_enabled = 0;
1488
1489                 } else {
1490
1491                         mod_timer(&cmc_poll_timer, jiffies + CMC_POLL_INTERVAL);
1492                 }
1493
1494                 start_count = -1;
1495         }
1496
1497         return IRQ_HANDLED;
1498 }
1499
1500 /*
1501  *  ia64_mca_cmc_poll
1502  *
1503  *      Poll for Corrected Machine Checks (CMCs)
1504  *
1505  * Inputs   :   dummy(unused)
1506  * Outputs  :   None
1507  *
1508  */
1509 static void
1510 ia64_mca_cmc_poll (unsigned long dummy)
1511 {
1512         /* Trigger a CMC interrupt cascade  */
1513         platform_send_ipi(first_cpu(cpu_online_map), IA64_CMCP_VECTOR, IA64_IPI_DM_INT, 0);
1514 }
1515
1516 /*
1517  *  ia64_mca_cpe_int_caller
1518  *
1519  *      Triggered by sw interrupt from CPE polling routine.  Calls
1520  *      real interrupt handler and either triggers a sw interrupt
1521  *      on the next cpu or does cleanup at the end.
1522  *
1523  * Inputs
1524  *      interrupt number
1525  *      client data arg ptr
1526  * Outputs
1527  *      handled
1528  */
1529 #ifdef CONFIG_ACPI
1530
1531 static irqreturn_t
1532 ia64_mca_cpe_int_caller(int cpe_irq, void *arg)
1533 {
1534         static int start_count = -1;
1535         static int poll_time = MIN_CPE_POLL_INTERVAL;
1536         unsigned int cpuid;
1537
1538         cpuid = smp_processor_id();
1539
1540         /* If first cpu, update count */
1541         if (start_count == -1)
1542                 start_count = IA64_LOG_COUNT(SAL_INFO_TYPE_CPE);
1543
1544         ia64_mca_cpe_int_handler(cpe_irq, arg);
1545
1546         cpuid = cpumask_next(cpuid+1, cpu_online_mask);
1547
1548         if (cpuid < NR_CPUS) {
1549                 platform_send_ipi(cpuid, IA64_CPEP_VECTOR, IA64_IPI_DM_INT, 0);
1550         } else {
1551                 /*
1552                  * If a log was recorded, increase our polling frequency,
1553                  * otherwise, backoff or return to interrupt mode.
1554                  */
1555                 if (start_count != IA64_LOG_COUNT(SAL_INFO_TYPE_CPE)) {
1556                         poll_time = max(MIN_CPE_POLL_INTERVAL, poll_time / 2);
1557                 } else if (cpe_vector < 0) {
1558                         poll_time = min(MAX_CPE_POLL_INTERVAL, poll_time * 2);
1559                 } else {
1560                         poll_time = MIN_CPE_POLL_INTERVAL;
1561
1562                         printk(KERN_WARNING "Returning to interrupt driven CPE handler\n");
1563                         enable_irq(local_vector_to_irq(IA64_CPE_VECTOR));
1564                         cpe_poll_enabled = 0;
1565                 }
1566
1567                 if (cpe_poll_enabled)
1568                         mod_timer(&cpe_poll_timer, jiffies + poll_time);
1569                 start_count = -1;
1570         }
1571
1572         return IRQ_HANDLED;
1573 }
1574
1575 /*
1576  *  ia64_mca_cpe_poll
1577  *
1578  *      Poll for Corrected Platform Errors (CPEs), trigger interrupt
1579  *      on first cpu, from there it will trickle through all the cpus.
1580  *
1581  * Inputs   :   dummy(unused)
1582  * Outputs  :   None
1583  *
1584  */
1585 static void
1586 ia64_mca_cpe_poll (unsigned long dummy)
1587 {
1588         /* Trigger a CPE interrupt cascade  */
1589         platform_send_ipi(first_cpu(cpu_online_map), IA64_CPEP_VECTOR, IA64_IPI_DM_INT, 0);
1590 }
1591
1592 #endif /* CONFIG_ACPI */
1593
1594 static int
1595 default_monarch_init_process(struct notifier_block *self, unsigned long val, void *data)
1596 {
1597         int c;
1598         struct task_struct *g, *t;
1599         if (val != DIE_INIT_MONARCH_PROCESS)
1600                 return NOTIFY_DONE;
1601 #ifdef CONFIG_KEXEC
1602         if (atomic_read(&kdump_in_progress))
1603                 return NOTIFY_DONE;
1604 #endif
1605
1606         /*
1607          * FIXME: mlogbuf will brim over with INIT stack dumps.
1608          * To enable show_stack from INIT, we use oops_in_progress which should
1609          * be used in real oops. This would cause something wrong after INIT.
1610          */
1611         BREAK_LOGLEVEL(console_loglevel);
1612         ia64_mlogbuf_dump_from_init();
1613
1614         printk(KERN_ERR "Processes interrupted by INIT -");
1615         for_each_online_cpu(c) {
1616                 struct ia64_sal_os_state *s;
1617                 t = __va(__per_cpu_mca[c] + IA64_MCA_CPU_INIT_STACK_OFFSET);
1618                 s = (struct ia64_sal_os_state *)((char *)t + MCA_SOS_OFFSET);
1619                 g = s->prev_task;
1620                 if (g) {
1621                         if (g->pid)
1622                                 printk(" %d", g->pid);
1623                         else
1624                                 printk(" %d (cpu %d task 0x%p)", g->pid, task_cpu(g), g);
1625                 }
1626         }
1627         printk("\n\n");
1628         if (read_trylock(&tasklist_lock)) {
1629                 do_each_thread (g, t) {
1630                         printk("\nBacktrace of pid %d (%s)\n", t->pid, t->comm);
1631                         show_stack(t, NULL);
1632                 } while_each_thread (g, t);
1633                 read_unlock(&tasklist_lock);
1634         }
1635         /* FIXME: This will not restore zapped printk locks. */
1636         RESTORE_LOGLEVEL(console_loglevel);
1637         return NOTIFY_DONE;
1638 }
1639
1640 /*
1641  * C portion of the OS INIT handler
1642  *
1643  * Called from ia64_os_init_dispatch
1644  *
1645  * Inputs: pointer to pt_regs where processor info was saved.  SAL/OS state for
1646  * this event.  This code is used for both monarch and slave INIT events, see
1647  * sos->monarch.
1648  *
1649  * All INIT events switch to the INIT stack and change the previous process to
1650  * blocked status.  If one of the INIT events is the monarch then we are
1651  * probably processing the nmi button/command.  Use the monarch cpu to dump all
1652  * the processes.  The slave INIT events all spin until the monarch cpu
1653  * returns.  We can also get INIT slave events for MCA, in which case the MCA
1654  * process is the monarch.
1655  */
1656
1657 void
1658 ia64_init_handler(struct pt_regs *regs, struct switch_stack *sw,
1659                   struct ia64_sal_os_state *sos)
1660 {
1661         static atomic_t slaves;
1662         static atomic_t monarchs;
1663         struct task_struct *previous_current;
1664         int cpu = smp_processor_id();
1665         struct ia64_mca_notify_die nd =
1666                 { .sos = sos, .monarch_cpu = &monarch_cpu };
1667
1668         NOTIFY_INIT(DIE_INIT_ENTER, regs, (long)&nd, 0);
1669
1670         mprintk(KERN_INFO "Entered OS INIT handler. PSP=%lx cpu=%d monarch=%ld\n",
1671                 sos->proc_state_param, cpu, sos->monarch);
1672         salinfo_log_wakeup(SAL_INFO_TYPE_INIT, NULL, 0, 0);
1673
1674         previous_current = ia64_mca_modify_original_stack(regs, sw, sos, "INIT");
1675         sos->os_status = IA64_INIT_RESUME;
1676
1677         /* FIXME: Workaround for broken proms that drive all INIT events as
1678          * slaves.  The last slave that enters is promoted to be a monarch.
1679          * Remove this code in September 2006, that gives platforms a year to
1680          * fix their proms and get their customers updated.
1681          */
1682         if (!sos->monarch && atomic_add_return(1, &slaves) == num_online_cpus()) {
1683                 mprintk(KERN_WARNING "%s: Promoting cpu %d to monarch.\n",
1684                         __func__, cpu);
1685                 atomic_dec(&slaves);
1686                 sos->monarch = 1;
1687         }
1688
1689         /* FIXME: Workaround for broken proms that drive all INIT events as
1690          * monarchs.  Second and subsequent monarchs are demoted to slaves.
1691          * Remove this code in September 2006, that gives platforms a year to
1692          * fix their proms and get their customers updated.
1693          */
1694         if (sos->monarch && atomic_add_return(1, &monarchs) > 1) {
1695                 mprintk(KERN_WARNING "%s: Demoting cpu %d to slave.\n",
1696                                __func__, cpu);
1697                 atomic_dec(&monarchs);
1698                 sos->monarch = 0;
1699         }
1700
1701         if (!sos->monarch) {
1702                 ia64_mc_info.imi_rendez_checkin[cpu] = IA64_MCA_RENDEZ_CHECKIN_INIT;
1703
1704 #ifdef CONFIG_KEXEC
1705                 while (monarch_cpu == -1 && !atomic_read(&kdump_in_progress))
1706                         udelay(1000);
1707 #else
1708                 while (monarch_cpu == -1)
1709                         cpu_relax();    /* spin until monarch enters */
1710 #endif
1711
1712                 NOTIFY_INIT(DIE_INIT_SLAVE_ENTER, regs, (long)&nd, 1);
1713                 NOTIFY_INIT(DIE_INIT_SLAVE_PROCESS, regs, (long)&nd, 1);
1714
1715 #ifdef CONFIG_KEXEC
1716                 while (monarch_cpu != -1 && !atomic_read(&kdump_in_progress))
1717                         udelay(1000);
1718 #else
1719                 while (monarch_cpu != -1)
1720                         cpu_relax();    /* spin until monarch leaves */
1721 #endif
1722
1723                 NOTIFY_INIT(DIE_INIT_SLAVE_LEAVE, regs, (long)&nd, 1);
1724
1725                 mprintk("Slave on cpu %d returning to normal service.\n", cpu);
1726                 set_curr_task(cpu, previous_current);
1727                 ia64_mc_info.imi_rendez_checkin[cpu] = IA64_MCA_RENDEZ_CHECKIN_NOTDONE;
1728                 atomic_dec(&slaves);
1729                 return;
1730         }
1731
1732         monarch_cpu = cpu;
1733         NOTIFY_INIT(DIE_INIT_MONARCH_ENTER, regs, (long)&nd, 1);
1734
1735         /*
1736          * Wait for a bit.  On some machines (e.g., HP's zx2000 and zx6000, INIT can be
1737          * generated via the BMC's command-line interface, but since the console is on the
1738          * same serial line, the user will need some time to switch out of the BMC before
1739          * the dump begins.
1740          */
1741         mprintk("Delaying for 5 seconds...\n");
1742         udelay(5*1000000);
1743         ia64_wait_for_slaves(cpu, "INIT");
1744         /* If nobody intercepts DIE_INIT_MONARCH_PROCESS then we drop through
1745          * to default_monarch_init_process() above and just print all the
1746          * tasks.
1747          */
1748         NOTIFY_INIT(DIE_INIT_MONARCH_PROCESS, regs, (long)&nd, 1);
1749         NOTIFY_INIT(DIE_INIT_MONARCH_LEAVE, regs, (long)&nd, 1);
1750
1751         mprintk("\nINIT dump complete.  Monarch on cpu %d returning to normal service.\n", cpu);
1752         atomic_dec(&monarchs);
1753         set_curr_task(cpu, previous_current);
1754         monarch_cpu = -1;
1755         return;
1756 }
1757
1758 static int __init
1759 ia64_mca_disable_cpe_polling(char *str)
1760 {
1761         cpe_poll_enabled = 0;
1762         return 1;
1763 }
1764
1765 __setup("disable_cpe_poll", ia64_mca_disable_cpe_polling);
1766
1767 static struct irqaction cmci_irqaction = {
1768         .handler =      ia64_mca_cmc_int_handler,
1769         .flags =        IRQF_DISABLED,
1770         .name =         "cmc_hndlr"
1771 };
1772
1773 static struct irqaction cmcp_irqaction = {
1774         .handler =      ia64_mca_cmc_int_caller,
1775         .flags =        IRQF_DISABLED,
1776         .name =         "cmc_poll"
1777 };
1778
1779 static struct irqaction mca_rdzv_irqaction = {
1780         .handler =      ia64_mca_rendez_int_handler,
1781         .flags =        IRQF_DISABLED,
1782         .name =         "mca_rdzv"
1783 };
1784
1785 static struct irqaction mca_wkup_irqaction = {
1786         .handler =      ia64_mca_wakeup_int_handler,
1787         .flags =        IRQF_DISABLED,
1788         .name =         "mca_wkup"
1789 };
1790
1791 #ifdef CONFIG_ACPI
1792 static struct irqaction mca_cpe_irqaction = {
1793         .handler =      ia64_mca_cpe_int_handler,
1794         .flags =        IRQF_DISABLED,
1795         .name =         "cpe_hndlr"
1796 };
1797
1798 static struct irqaction mca_cpep_irqaction = {
1799         .handler =      ia64_mca_cpe_int_caller,
1800         .flags =        IRQF_DISABLED,
1801         .name =         "cpe_poll"
1802 };
1803 #endif /* CONFIG_ACPI */
1804
1805 /* Minimal format of the MCA/INIT stacks.  The pseudo processes that run on
1806  * these stacks can never sleep, they cannot return from the kernel to user
1807  * space, they do not appear in a normal ps listing.  So there is no need to
1808  * format most of the fields.
1809  */
1810
1811 static void __cpuinit
1812 format_mca_init_stack(void *mca_data, unsigned long offset,
1813                 const char *type, int cpu)
1814 {
1815         struct task_struct *p = (struct task_struct *)((char *)mca_data + offset);
1816         struct thread_info *ti;
1817         memset(p, 0, KERNEL_STACK_SIZE);
1818         ti = task_thread_info(p);
1819         ti->flags = _TIF_MCA_INIT;
1820         ti->preempt_count = 1;
1821         ti->task = p;
1822         ti->cpu = cpu;
1823         p->stack = ti;
1824         p->state = TASK_UNINTERRUPTIBLE;
1825         cpu_set(cpu, p->cpus_allowed);
1826         INIT_LIST_HEAD(&p->tasks);
1827         p->parent = p->real_parent = p->group_leader = p;
1828         INIT_LIST_HEAD(&p->children);
1829         INIT_LIST_HEAD(&p->sibling);
1830         strncpy(p->comm, type, sizeof(p->comm)-1);
1831 }
1832
1833 /* Caller prevents this from being called after init */
1834 static void * __init_refok mca_bootmem(void)
1835 {
1836         return __alloc_bootmem(sizeof(struct ia64_mca_cpu),
1837                             KERNEL_STACK_SIZE, 0);
1838 }
1839
1840 /* Do per-CPU MCA-related initialization.  */
1841 void __cpuinit
1842 ia64_mca_cpu_init(void *cpu_data)
1843 {
1844         void *pal_vaddr;
1845         void *data;
1846         long sz = sizeof(struct ia64_mca_cpu);
1847         int cpu = smp_processor_id();
1848         static int first_time = 1;
1849
1850         /*
1851          * Structure will already be allocated if cpu has been online,
1852          * then offlined.
1853          */
1854         if (__per_cpu_mca[cpu]) {
1855                 data = __va(__per_cpu_mca[cpu]);
1856         } else {
1857                 if (first_time) {
1858                         data = mca_bootmem();
1859                         first_time = 0;
1860                 } else
1861                         data = __get_free_pages(GFP_KERNEL, get_order(sz));
1862                 if (!data)
1863                         panic("Could not allocate MCA memory for cpu %d\n",
1864                                         cpu);
1865         }
1866         format_mca_init_stack(data, offsetof(struct ia64_mca_cpu, mca_stack),
1867                 "MCA", cpu);
1868         format_mca_init_stack(data, offsetof(struct ia64_mca_cpu, init_stack),
1869                 "INIT", cpu);
1870         __get_cpu_var(ia64_mca_data) = __per_cpu_mca[cpu] = __pa(data);
1871
1872         /*
1873          * Stash away a copy of the PTE needed to map the per-CPU page.
1874          * We may need it during MCA recovery.
1875          */
1876         __get_cpu_var(ia64_mca_per_cpu_pte) =
1877                 pte_val(mk_pte_phys(__pa(cpu_data), PAGE_KERNEL));
1878
1879         /*
1880          * Also, stash away a copy of the PAL address and the PTE
1881          * needed to map it.
1882          */
1883         pal_vaddr = efi_get_pal_addr();
1884         if (!pal_vaddr)
1885                 return;
1886         __get_cpu_var(ia64_mca_pal_base) =
1887                 GRANULEROUNDDOWN((unsigned long) pal_vaddr);
1888         __get_cpu_var(ia64_mca_pal_pte) = pte_val(mk_pte_phys(__pa(pal_vaddr),
1889                                                               PAGE_KERNEL));
1890 }
1891
1892 static void __cpuinit ia64_mca_cmc_vector_adjust(void *dummy)
1893 {
1894         unsigned long flags;
1895
1896         local_irq_save(flags);
1897         if (!cmc_polling_enabled)
1898                 ia64_mca_cmc_vector_enable(NULL);
1899         local_irq_restore(flags);
1900 }
1901
1902 static int __cpuinit mca_cpu_callback(struct notifier_block *nfb,
1903                                       unsigned long action,
1904                                       void *hcpu)
1905 {
1906         int hotcpu = (unsigned long) hcpu;
1907
1908         switch (action) {
1909         case CPU_ONLINE:
1910         case CPU_ONLINE_FROZEN:
1911                 smp_call_function_single(hotcpu, ia64_mca_cmc_vector_adjust,
1912                                          NULL, 0);
1913                 break;
1914         }
1915         return NOTIFY_OK;
1916 }
1917
1918 static struct notifier_block mca_cpu_notifier __cpuinitdata = {
1919         .notifier_call = mca_cpu_callback
1920 };
1921
1922 /*
1923  * ia64_mca_init
1924  *
1925  *  Do all the system level mca specific initialization.
1926  *
1927  *      1. Register spinloop and wakeup request interrupt vectors
1928  *
1929  *      2. Register OS_MCA handler entry point
1930  *
1931  *      3. Register OS_INIT handler entry point
1932  *
1933  *  4. Initialize MCA/CMC/INIT related log buffers maintained by the OS.
1934  *
1935  *  Note that this initialization is done very early before some kernel
1936  *  services are available.
1937  *
1938  *  Inputs  :   None
1939  *
1940  *  Outputs :   None
1941  */
1942 void __init
1943 ia64_mca_init(void)
1944 {
1945         ia64_fptr_t *init_hldlr_ptr_monarch = (ia64_fptr_t *)ia64_os_init_dispatch_monarch;
1946         ia64_fptr_t *init_hldlr_ptr_slave = (ia64_fptr_t *)ia64_os_init_dispatch_slave;
1947         ia64_fptr_t *mca_hldlr_ptr = (ia64_fptr_t *)ia64_os_mca_dispatch;
1948         int i;
1949         long rc;
1950         struct ia64_sal_retval isrv;
1951         unsigned long timeout = IA64_MCA_RENDEZ_TIMEOUT; /* platform specific */
1952         static struct notifier_block default_init_monarch_nb = {
1953                 .notifier_call = default_monarch_init_process,
1954                 .priority = 0/* we need to notified last */
1955         };
1956
1957         IA64_MCA_DEBUG("%s: begin\n", __func__);
1958
1959         /* Clear the Rendez checkin flag for all cpus */
1960         for(i = 0 ; i < NR_CPUS; i++)
1961                 ia64_mc_info.imi_rendez_checkin[i] = IA64_MCA_RENDEZ_CHECKIN_NOTDONE;
1962
1963         /*
1964          * Register the rendezvous spinloop and wakeup mechanism with SAL
1965          */
1966
1967         /* Register the rendezvous interrupt vector with SAL */
1968         while (1) {
1969                 isrv = ia64_sal_mc_set_params(SAL_MC_PARAM_RENDEZ_INT,
1970                                               SAL_MC_PARAM_MECHANISM_INT,
1971                                               IA64_MCA_RENDEZ_VECTOR,
1972                                               timeout,
1973                                               SAL_MC_PARAM_RZ_ALWAYS);
1974                 rc = isrv.status;
1975                 if (rc == 0)
1976                         break;
1977                 if (rc == -2) {
1978                         printk(KERN_INFO "Increasing MCA rendezvous timeout from "
1979                                 "%ld to %ld milliseconds\n", timeout, isrv.v0);
1980                         timeout = isrv.v0;
1981                         NOTIFY_MCA(DIE_MCA_NEW_TIMEOUT, NULL, timeout, 0);
1982                         continue;
1983                 }
1984                 printk(KERN_ERR "Failed to register rendezvous interrupt "
1985                        "with SAL (status %ld)\n", rc);
1986                 return;
1987         }
1988
1989         /* Register the wakeup interrupt vector with SAL */
1990         isrv = ia64_sal_mc_set_params(SAL_MC_PARAM_RENDEZ_WAKEUP,
1991                                       SAL_MC_PARAM_MECHANISM_INT,
1992                                       IA64_MCA_WAKEUP_VECTOR,
1993                                       0, 0);
1994         rc = isrv.status;
1995         if (rc) {
1996                 printk(KERN_ERR "Failed to register wakeup interrupt with SAL "
1997                        "(status %ld)\n", rc);
1998                 return;
1999         }
2000
2001         IA64_MCA_DEBUG("%s: registered MCA rendezvous spinloop and wakeup mech.\n", __func__);
2002
2003         ia64_mc_info.imi_mca_handler        = ia64_tpa(mca_hldlr_ptr->fp);
2004         /*
2005          * XXX - disable SAL checksum by setting size to 0; should be
2006          *      ia64_tpa(ia64_os_mca_dispatch_end) - ia64_tpa(ia64_os_mca_dispatch);
2007          */
2008         ia64_mc_info.imi_mca_handler_size       = 0;
2009
2010         /* Register the os mca handler with SAL */
2011         if ((rc = ia64_sal_set_vectors(SAL_VECTOR_OS_MCA,
2012                                        ia64_mc_info.imi_mca_handler,
2013                                        ia64_tpa(mca_hldlr_ptr->gp),
2014                                        ia64_mc_info.imi_mca_handler_size,
2015                                        0, 0, 0)))
2016         {
2017                 printk(KERN_ERR "Failed to register OS MCA handler with SAL "
2018                        "(status %ld)\n", rc);
2019                 return;
2020         }
2021
2022         IA64_MCA_DEBUG("%s: registered OS MCA handler with SAL at 0x%lx, gp = 0x%lx\n", __func__,
2023                        ia64_mc_info.imi_mca_handler, ia64_tpa(mca_hldlr_ptr->gp));
2024
2025         /*
2026          * XXX - disable SAL checksum by setting size to 0, should be
2027          * size of the actual init handler in mca_asm.S.
2028          */
2029         ia64_mc_info.imi_monarch_init_handler           = ia64_tpa(init_hldlr_ptr_monarch->fp);
2030         ia64_mc_info.imi_monarch_init_handler_size      = 0;
2031         ia64_mc_info.imi_slave_init_handler             = ia64_tpa(init_hldlr_ptr_slave->fp);
2032         ia64_mc_info.imi_slave_init_handler_size        = 0;
2033
2034         IA64_MCA_DEBUG("%s: OS INIT handler at %lx\n", __func__,
2035                        ia64_mc_info.imi_monarch_init_handler);
2036
2037         /* Register the os init handler with SAL */
2038         if ((rc = ia64_sal_set_vectors(SAL_VECTOR_OS_INIT,
2039                                        ia64_mc_info.imi_monarch_init_handler,
2040                                        ia64_tpa(ia64_getreg(_IA64_REG_GP)),
2041                                        ia64_mc_info.imi_monarch_init_handler_size,
2042                                        ia64_mc_info.imi_slave_init_handler,
2043                                        ia64_tpa(ia64_getreg(_IA64_REG_GP)),
2044                                        ia64_mc_info.imi_slave_init_handler_size)))
2045         {
2046                 printk(KERN_ERR "Failed to register m/s INIT handlers with SAL "
2047                        "(status %ld)\n", rc);
2048                 return;
2049         }
2050         if (register_die_notifier(&default_init_monarch_nb)) {
2051                 printk(KERN_ERR "Failed to register default monarch INIT process\n");
2052                 return;
2053         }
2054
2055         IA64_MCA_DEBUG("%s: registered OS INIT handler with SAL\n", __func__);
2056
2057         /*
2058          *  Configure the CMCI/P vector and handler. Interrupts for CMC are
2059          *  per-processor, so AP CMC interrupts are setup in smp_callin() (smpboot.c).
2060          */
2061         register_percpu_irq(IA64_CMC_VECTOR, &cmci_irqaction);
2062         register_percpu_irq(IA64_CMCP_VECTOR, &cmcp_irqaction);
2063         ia64_mca_cmc_vector_setup();       /* Setup vector on BSP */
2064
2065         /* Setup the MCA rendezvous interrupt vector */
2066         register_percpu_irq(IA64_MCA_RENDEZ_VECTOR, &mca_rdzv_irqaction);
2067
2068         /* Setup the MCA wakeup interrupt vector */
2069         register_percpu_irq(IA64_MCA_WAKEUP_VECTOR, &mca_wkup_irqaction);
2070
2071 #ifdef CONFIG_ACPI
2072         /* Setup the CPEI/P handler */
2073         register_percpu_irq(IA64_CPEP_VECTOR, &mca_cpep_irqaction);
2074 #endif
2075
2076         /* Initialize the areas set aside by the OS to buffer the
2077          * platform/processor error states for MCA/INIT/CMC
2078          * handling.
2079          */
2080         ia64_log_init(SAL_INFO_TYPE_MCA);
2081         ia64_log_init(SAL_INFO_TYPE_INIT);
2082         ia64_log_init(SAL_INFO_TYPE_CMC);
2083         ia64_log_init(SAL_INFO_TYPE_CPE);
2084
2085         mca_init = 1;
2086         printk(KERN_INFO "MCA related initialization done\n");
2087 }
2088
2089 /*
2090  * ia64_mca_late_init
2091  *
2092  *      Opportunity to setup things that require initialization later
2093  *      than ia64_mca_init.  Setup a timer to poll for CPEs if the
2094  *      platform doesn't support an interrupt driven mechanism.
2095  *
2096  *  Inputs  :   None
2097  *  Outputs :   Status
2098  */
2099 static int __init
2100 ia64_mca_late_init(void)
2101 {
2102         if (!mca_init)
2103                 return 0;
2104
2105         register_hotcpu_notifier(&mca_cpu_notifier);
2106
2107         /* Setup the CMCI/P vector and handler */
2108         init_timer(&cmc_poll_timer);
2109         cmc_poll_timer.function = ia64_mca_cmc_poll;
2110
2111         /* Unmask/enable the vector */
2112         cmc_polling_enabled = 0;
2113         schedule_work(&cmc_enable_work);
2114
2115         IA64_MCA_DEBUG("%s: CMCI/P setup and enabled.\n", __func__);
2116
2117 #ifdef CONFIG_ACPI
2118         /* Setup the CPEI/P vector and handler */
2119         cpe_vector = acpi_request_vector(ACPI_INTERRUPT_CPEI);
2120         init_timer(&cpe_poll_timer);
2121         cpe_poll_timer.function = ia64_mca_cpe_poll;
2122
2123         {
2124                 struct irq_desc *desc;
2125                 unsigned int irq;
2126
2127                 if (cpe_vector >= 0) {
2128                         /* If platform supports CPEI, enable the irq. */
2129                         irq = local_vector_to_irq(cpe_vector);
2130                         if (irq > 0) {
2131                                 cpe_poll_enabled = 0;
2132                                 desc = irq_desc + irq;
2133                                 desc->status |= IRQ_PER_CPU;
2134                                 setup_irq(irq, &mca_cpe_irqaction);
2135                                 ia64_cpe_irq = irq;
2136                                 ia64_mca_register_cpev(cpe_vector);
2137                                 IA64_MCA_DEBUG("%s: CPEI/P setup and enabled.\n",
2138                                         __func__);
2139                                 return 0;
2140                         }
2141                         printk(KERN_ERR "%s: Failed to find irq for CPE "
2142                                         "interrupt handler, vector %d\n",
2143                                         __func__, cpe_vector);
2144                 }
2145                 /* If platform doesn't support CPEI, get the timer going. */
2146                 if (cpe_poll_enabled) {
2147                         ia64_mca_cpe_poll(0UL);
2148                         IA64_MCA_DEBUG("%s: CPEP setup and enabled.\n", __func__);
2149                 }
2150         }
2151 #endif
2152
2153         return 0;
2154 }
2155
2156 device_initcall(ia64_mca_late_init);