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Linux/arch/ia64/kernel/mca.c

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  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 #include <linux/gfp.h>
 89 
 90 #include <asm/delay.h>
 91 #include <asm/machvec.h>
 92 #include <asm/meminit.h>
 93 #include <asm/page.h>
 94 #include <asm/ptrace.h>
 95 #include <asm/system.h>
 96 #include <asm/sal.h>
 97 #include <asm/mca.h>
 98 #include <asm/kexec.h>
 99 
100 #include <asm/irq.h>
101 #include <asm/hw_irq.h>
102 #include <asm/tlb.h>
103 
104 #include "mca_drv.h"
105 #include "entry.h"
106 
107 #if defined(IA64_MCA_DEBUG_INFO)
108 # define IA64_MCA_DEBUG(fmt...) printk(fmt)
109 #else
110 # define IA64_MCA_DEBUG(fmt...)
111 #endif
112 
113 #define NOTIFY_INIT(event, regs, arg, spin)                             \
114 do {                                                                    \
115         if ((notify_die((event), "INIT", (regs), (arg), 0, 0)           \
116                         == NOTIFY_STOP) && ((spin) == 1))               \
117                 ia64_mca_spin(__func__);                                \
118 } while (0)
119 
120 #define NOTIFY_MCA(event, regs, arg, spin)                              \
121 do {                                                                    \
122         if ((notify_die((event), "MCA", (regs), (arg), 0, 0)            \
123                         == NOTIFY_STOP) && ((spin) == 1))               \
124                 ia64_mca_spin(__func__);                                \
125 } while (0)
126 
127 /* Used by mca_asm.S */
128 DEFINE_PER_CPU(u64, ia64_mca_data); /* == __per_cpu_mca[smp_processor_id()] */
129 DEFINE_PER_CPU(u64, ia64_mca_per_cpu_pte); /* PTE to map per-CPU area */
130 DEFINE_PER_CPU(u64, ia64_mca_pal_pte);      /* PTE to map PAL code */
131 DEFINE_PER_CPU(u64, ia64_mca_pal_base);    /* vaddr PAL code granule */
132 DEFINE_PER_CPU(u64, ia64_mca_tr_reload);   /* Flag for TR reload */
133 
134 unsigned long __per_cpu_mca[NR_CPUS];
135 
136 /* In mca_asm.S */
137 extern void                     ia64_os_init_dispatch_monarch (void);
138 extern void                     ia64_os_init_dispatch_slave (void);
139 
140 static int monarch_cpu = -1;
141 
142 static ia64_mc_info_t           ia64_mc_info;
143 
144 #define MAX_CPE_POLL_INTERVAL (15*60*HZ) /* 15 minutes */
145 #define MIN_CPE_POLL_INTERVAL (2*60*HZ)  /* 2 minutes */
146 #define CMC_POLL_INTERVAL     (1*60*HZ)  /* 1 minute */
147 #define CPE_HISTORY_LENGTH    5
148 #define CMC_HISTORY_LENGTH    5
149 
150 #ifdef CONFIG_ACPI
151 static struct timer_list cpe_poll_timer;
152 #endif
153 static struct timer_list cmc_poll_timer;
154 /*
155  * This variable tells whether we are currently in polling mode.
156  * Start with this in the wrong state so we won't play w/ timers
157  * before the system is ready.
158  */
159 static int cmc_polling_enabled = 1;
160 
161 /*
162  * Clearing this variable prevents CPE polling from getting activated
163  * in mca_late_init.  Use it if your system doesn't provide a CPEI,
164  * but encounters problems retrieving CPE logs.  This should only be
165  * necessary for debugging.
166  */
167 static int cpe_poll_enabled = 1;
168 
169 extern void salinfo_log_wakeup(int type, u8 *buffer, u64 size, int irqsafe);
170 
171 static int mca_init __initdata;
172 
173 /*
174  * limited & delayed printing support for MCA/INIT handler
175  */
176 
177 #define mprintk(fmt...) ia64_mca_printk(fmt)
178 
179 #define MLOGBUF_SIZE (512+256*NR_CPUS)
180 #define MLOGBUF_MSGMAX 256
181 static char mlogbuf[MLOGBUF_SIZE];
182 static DEFINE_SPINLOCK(mlogbuf_wlock);  /* mca context only */
183 static DEFINE_SPINLOCK(mlogbuf_rlock);  /* normal context only */
184 static unsigned long mlogbuf_start;
185 static unsigned long mlogbuf_end;
186 static unsigned int mlogbuf_finished = 0;
187 static unsigned long mlogbuf_timestamp = 0;
188 
189 static int loglevel_save = -1;
190 #define BREAK_LOGLEVEL(__console_loglevel)              \
191         oops_in_progress = 1;                           \
192         if (loglevel_save < 0)                          \
193                 loglevel_save = __console_loglevel;     \
194         __console_loglevel = 15;
195 
196 #define RESTORE_LOGLEVEL(__console_loglevel)            \
197         if (loglevel_save >= 0) {                       \
198                 __console_loglevel = loglevel_save;     \
199                 loglevel_save = -1;                     \
200         }                                               \
201         mlogbuf_finished = 0;                           \
202         oops_in_progress = 0;
203 
204 /*
205  * Push messages into buffer, print them later if not urgent.
206  */
207 void ia64_mca_printk(const char *fmt, ...)
208 {
209         va_list args;
210         int printed_len;
211         char temp_buf[MLOGBUF_MSGMAX];
212         char *p;
213 
214         va_start(args, fmt);
215         printed_len = vscnprintf(temp_buf, sizeof(temp_buf), fmt, args);
216         va_end(args);
217 
218         /* Copy the output into mlogbuf */
219         if (oops_in_progress) {
220                 /* mlogbuf was abandoned, use printk directly instead. */
221                 printk(temp_buf);
222         } else {
223                 spin_lock(&mlogbuf_wlock);
224                 for (p = temp_buf; *p; p++) {
225                         unsigned long next = (mlogbuf_end + 1) % MLOGBUF_SIZE;
226                         if (next != mlogbuf_start) {
227                                 mlogbuf[mlogbuf_end] = *p;
228                                 mlogbuf_end = next;
229                         } else {
230                                 /* buffer full */
231                                 break;
232                         }
233                 }
234                 mlogbuf[mlogbuf_end] = '\0';
235                 spin_unlock(&mlogbuf_wlock);
236         }
237 }
238 EXPORT_SYMBOL(ia64_mca_printk);
239 
240 /*
241  * Print buffered messages.
242  *  NOTE: call this after returning normal context. (ex. from salinfod)
243  */
244 void ia64_mlogbuf_dump(void)
245 {
246         char temp_buf[MLOGBUF_MSGMAX];
247         char *p;
248         unsigned long index;
249         unsigned long flags;
250         unsigned int printed_len;
251 
252         /* Get output from mlogbuf */
253         while (mlogbuf_start != mlogbuf_end) {
254                 temp_buf[0] = '\0';
255                 p = temp_buf;
256                 printed_len = 0;
257 
258                 spin_lock_irqsave(&mlogbuf_rlock, flags);
259 
260                 index = mlogbuf_start;
261                 while (index != mlogbuf_end) {
262                         *p = mlogbuf[index];
263                         index = (index + 1) % MLOGBUF_SIZE;
264                         if (!*p)
265                                 break;
266                         p++;
267                         if (++printed_len >= MLOGBUF_MSGMAX - 1)
268                                 break;
269                 }
270                 *p = '\0';
271                 if (temp_buf[0])
272                         printk(temp_buf);
273                 mlogbuf_start = index;
274 
275                 mlogbuf_timestamp = 0;
276                 spin_unlock_irqrestore(&mlogbuf_rlock, flags);
277         }
278 }
279 EXPORT_SYMBOL(ia64_mlogbuf_dump);
280 
281 /*
282  * Call this if system is going to down or if immediate flushing messages to
283  * console is required. (ex. recovery was failed, crash dump is going to be
284  * invoked, long-wait rendezvous etc.)
285  *  NOTE: this should be called from monarch.
286  */
287 static void ia64_mlogbuf_finish(int wait)
288 {
289         BREAK_LOGLEVEL(console_loglevel);
290 
291         spin_lock_init(&mlogbuf_rlock);
292         ia64_mlogbuf_dump();
293         printk(KERN_EMERG "mlogbuf_finish: printing switched to urgent mode, "
294                 "MCA/INIT might be dodgy or fail.\n");
295 
296         if (!wait)
297                 return;
298 
299         /* wait for console */
300         printk("Delaying for 5 seconds...\n");
301         udelay(5*1000000);
302 
303         mlogbuf_finished = 1;
304 }
305 
306 /*
307  * Print buffered messages from INIT context.
308  */
309 static void ia64_mlogbuf_dump_from_init(void)
310 {
311         if (mlogbuf_finished)
312                 return;
313 
314         if (mlogbuf_timestamp &&
315                         time_before(jiffies, mlogbuf_timestamp + 30 * HZ)) {
316                 printk(KERN_ERR "INIT: mlogbuf_dump is interrupted by INIT "
317                         " and the system seems to be messed up.\n");
318                 ia64_mlogbuf_finish(0);
319                 return;
320         }
321 
322         if (!spin_trylock(&mlogbuf_rlock)) {
323                 printk(KERN_ERR "INIT: mlogbuf_dump is interrupted by INIT. "
324                         "Generated messages other than stack dump will be "
325                         "buffered to mlogbuf and will be printed later.\n");
326                 printk(KERN_ERR "INIT: If messages would not printed after "
327                         "this INIT, wait 30sec and assert INIT again.\n");
328                 if (!mlogbuf_timestamp)
329                         mlogbuf_timestamp = jiffies;
330                 return;
331         }
332         spin_unlock(&mlogbuf_rlock);
333         ia64_mlogbuf_dump();
334 }
335 
336 static void inline
337 ia64_mca_spin(const char *func)
338 {
339         if (monarch_cpu == smp_processor_id())
340                 ia64_mlogbuf_finish(0);
341         mprintk(KERN_EMERG "%s: spinning here, not returning to SAL\n", func);
342         while (1)
343                 cpu_relax();
344 }
345 /*
346  * IA64_MCA log support
347  */
348 #define IA64_MAX_LOGS           2       /* Double-buffering for nested MCAs */
349 #define IA64_MAX_LOG_TYPES      4   /* MCA, INIT, CMC, CPE */
350 
351 typedef struct ia64_state_log_s
352 {
353         spinlock_t      isl_lock;
354         int             isl_index;
355         unsigned long   isl_count;
356         ia64_err_rec_t  *isl_log[IA64_MAX_LOGS]; /* need space to store header + error log */
357 } ia64_state_log_t;
358 
359 static ia64_state_log_t ia64_state_log[IA64_MAX_LOG_TYPES];
360 
361 #define IA64_LOG_ALLOCATE(it, size) \
362         {ia64_state_log[it].isl_log[IA64_LOG_CURR_INDEX(it)] = \
363                 (ia64_err_rec_t *)alloc_bootmem(size); \
364         ia64_state_log[it].isl_log[IA64_LOG_NEXT_INDEX(it)] = \
365                 (ia64_err_rec_t *)alloc_bootmem(size);}
366 #define IA64_LOG_LOCK_INIT(it) spin_lock_init(&ia64_state_log[it].isl_lock)
367 #define IA64_LOG_LOCK(it)      spin_lock_irqsave(&ia64_state_log[it].isl_lock, s)
368 #define IA64_LOG_UNLOCK(it)    spin_unlock_irqrestore(&ia64_state_log[it].isl_lock,s)
369 #define IA64_LOG_NEXT_INDEX(it)    ia64_state_log[it].isl_index
370 #define IA64_LOG_CURR_INDEX(it)    1 - ia64_state_log[it].isl_index
371 #define IA64_LOG_INDEX_INC(it) \
372     {ia64_state_log[it].isl_index = 1 - ia64_state_log[it].isl_index; \
373     ia64_state_log[it].isl_count++;}
374 #define IA64_LOG_INDEX_DEC(it) \
375     ia64_state_log[it].isl_index = 1 - ia64_state_log[it].isl_index
376 #define IA64_LOG_NEXT_BUFFER(it)   (void *)((ia64_state_log[it].isl_log[IA64_LOG_NEXT_INDEX(it)]))
377 #define IA64_LOG_CURR_BUFFER(it)   (void *)((ia64_state_log[it].isl_log[IA64_LOG_CURR_INDEX(it)]))
378 #define IA64_LOG_COUNT(it)         ia64_state_log[it].isl_count
379 
380 /*
381  * ia64_log_init
382  *      Reset the OS ia64 log buffer
383  * Inputs   :   info_type   (SAL_INFO_TYPE_{MCA,INIT,CMC,CPE})
384  * Outputs      :       None
385  */
386 static void __init
387 ia64_log_init(int sal_info_type)
388 {
389         u64     max_size = 0;
390 
391         IA64_LOG_NEXT_INDEX(sal_info_type) = 0;
392         IA64_LOG_LOCK_INIT(sal_info_type);
393 
394         // SAL will tell us the maximum size of any error record of this type
395         max_size = ia64_sal_get_state_info_size(sal_info_type);
396         if (!max_size)
397                 /* alloc_bootmem() doesn't like zero-sized allocations! */
398                 return;
399 
400         // set up OS data structures to hold error info
401         IA64_LOG_ALLOCATE(sal_info_type, max_size);
402         memset(IA64_LOG_CURR_BUFFER(sal_info_type), 0, max_size);
403         memset(IA64_LOG_NEXT_BUFFER(sal_info_type), 0, max_size);
404 }
405 
406 /*
407  * ia64_log_get
408  *
409  *      Get the current MCA log from SAL and copy it into the OS log buffer.
410  *
411  *  Inputs  :   info_type   (SAL_INFO_TYPE_{MCA,INIT,CMC,CPE})
412  *              irq_safe    whether you can use printk at this point
413  *  Outputs :   size        (total record length)
414  *              *buffer     (ptr to error record)
415  *
416  */
417 static u64
418 ia64_log_get(int sal_info_type, u8 **buffer, int irq_safe)
419 {
420         sal_log_record_header_t     *log_buffer;
421         u64                         total_len = 0;
422         unsigned long               s;
423 
424         IA64_LOG_LOCK(sal_info_type);
425 
426         /* Get the process state information */
427         log_buffer = IA64_LOG_NEXT_BUFFER(sal_info_type);
428 
429         total_len = ia64_sal_get_state_info(sal_info_type, (u64 *)log_buffer);
430 
431         if (total_len) {
432                 IA64_LOG_INDEX_INC(sal_info_type);
433                 IA64_LOG_UNLOCK(sal_info_type);
434                 if (irq_safe) {
435                         IA64_MCA_DEBUG("%s: SAL error record type %d retrieved. Record length = %ld\n",
436                                        __func__, sal_info_type, total_len);
437                 }
438                 *buffer = (u8 *) log_buffer;
439                 return total_len;
440         } else {
441                 IA64_LOG_UNLOCK(sal_info_type);
442                 return 0;
443         }
444 }
445 
446 /*
447  *  ia64_mca_log_sal_error_record
448  *
449  *  This function retrieves a specified error record type from SAL
450  *  and wakes up any processes waiting for error records.
451  *
452  *  Inputs  :   sal_info_type   (Type of error record MCA/CMC/CPE)
453  *              FIXME: remove MCA and irq_safe.
454  */
455 static void
456 ia64_mca_log_sal_error_record(int sal_info_type)
457 {
458         u8 *buffer;
459         sal_log_record_header_t *rh;
460         u64 size;
461         int irq_safe = sal_info_type != SAL_INFO_TYPE_MCA;
462 #ifdef IA64_MCA_DEBUG_INFO
463         static const char * const rec_name[] = { "MCA", "INIT", "CMC", "CPE" };
464 #endif
465 
466         size = ia64_log_get(sal_info_type, &buffer, irq_safe);
467         if (!size)
468                 return;
469 
470         salinfo_log_wakeup(sal_info_type, buffer, size, irq_safe);
471 
472         if (irq_safe)
473                 IA64_MCA_DEBUG("CPU %d: SAL log contains %s error record\n",
474                         smp_processor_id(),
475                         sal_info_type < ARRAY_SIZE(rec_name) ? rec_name[sal_info_type] : "UNKNOWN");
476 
477         /* Clear logs from corrected errors in case there's no user-level logger */
478         rh = (sal_log_record_header_t *)buffer;
479         if (rh->severity == sal_log_severity_corrected)
480                 ia64_sal_clear_state_info(sal_info_type);
481 }
482 
483 /*
484  * search_mca_table
485  *  See if the MCA surfaced in an instruction range
486  *  that has been tagged as recoverable.
487  *
488  *  Inputs
489  *      first   First address range to check
490  *      last    Last address range to check
491  *      ip      Instruction pointer, address we are looking for
492  *
493  * Return value:
494  *      1 on Success (in the table)/ 0 on Failure (not in the  table)
495  */
496 int
497 search_mca_table (const struct mca_table_entry *first,
498                 const struct mca_table_entry *last,
499                 unsigned long ip)
500 {
501         const struct mca_table_entry *curr;
502         u64 curr_start, curr_end;
503 
504         curr = first;
505         while (curr <= last) {
506                 curr_start = (u64) &curr->start_addr + curr->start_addr;
507                 curr_end = (u64) &curr->end_addr + curr->end_addr;
508 
509                 if ((ip >= curr_start) && (ip <= curr_end)) {
510                         return 1;
511                 }
512                 curr++;
513         }
514         return 0;
515 }
516 
517 /* Given an address, look for it in the mca tables. */
518 int mca_recover_range(unsigned long addr)
519 {
520         extern struct mca_table_entry __start___mca_table[];
521         extern struct mca_table_entry __stop___mca_table[];
522 
523         return search_mca_table(__start___mca_table, __stop___mca_table-1, addr);
524 }
525 EXPORT_SYMBOL_GPL(mca_recover_range);
526 
527 #ifdef CONFIG_ACPI
528 
529 int cpe_vector = -1;
530 int ia64_cpe_irq = -1;
531 
532 static irqreturn_t
533 ia64_mca_cpe_int_handler (int cpe_irq, void *arg)
534 {
535         static unsigned long    cpe_history[CPE_HISTORY_LENGTH];
536         static int              index;
537         static DEFINE_SPINLOCK(cpe_history_lock);
538 
539         IA64_MCA_DEBUG("%s: received interrupt vector = %#x on CPU %d\n",
540                        __func__, cpe_irq, smp_processor_id());
541 
542         /* SAL spec states this should run w/ interrupts enabled */
543         local_irq_enable();
544 
545         spin_lock(&cpe_history_lock);
546         if (!cpe_poll_enabled && cpe_vector >= 0) {
547 
548                 int i, count = 1; /* we know 1 happened now */
549                 unsigned long now = jiffies;
550 
551                 for (i = 0; i < CPE_HISTORY_LENGTH; i++) {
552                         if (now - cpe_history[i] <= HZ)
553                                 count++;
554                 }
555 
556                 IA64_MCA_DEBUG(KERN_INFO "CPE threshold %d/%d\n", count, CPE_HISTORY_LENGTH);
557                 if (count >= CPE_HISTORY_LENGTH) {
558 
559                         cpe_poll_enabled = 1;
560                         spin_unlock(&cpe_history_lock);
561                         disable_irq_nosync(local_vector_to_irq(IA64_CPE_VECTOR));
562 
563                         /*
564                          * Corrected errors will still be corrected, but
565                          * make sure there's a log somewhere that indicates
566                          * something is generating more than we can handle.
567                          */
568                         printk(KERN_WARNING "WARNING: Switching to polling CPE handler; error records may be lost\n");
569 
570                         mod_timer(&cpe_poll_timer, jiffies + MIN_CPE_POLL_INTERVAL);
571 
572                         /* lock already released, get out now */
573                         goto out;
574                 } else {
575                         cpe_history[index++] = now;
576                         if (index == CPE_HISTORY_LENGTH)
577                                 index = 0;
578                 }
579         }
580         spin_unlock(&cpe_history_lock);
581 out:
582         /* Get the CPE error record and log it */
583         ia64_mca_log_sal_error_record(SAL_INFO_TYPE_CPE);
584 
585         local_irq_disable();
586 
587         return IRQ_HANDLED;
588 }
589 
590 #endif /* CONFIG_ACPI */
591 
592 #ifdef CONFIG_ACPI
593 /*
594  * ia64_mca_register_cpev
595  *
596  *  Register the corrected platform error vector with SAL.
597  *
598  *  Inputs
599  *      cpev        Corrected Platform Error Vector number
600  *
601  *  Outputs
602  *      None
603  */
604 void
605 ia64_mca_register_cpev (int cpev)
606 {
607         /* Register the CPE interrupt vector with SAL */
608         struct ia64_sal_retval isrv;
609 
610         isrv = ia64_sal_mc_set_params(SAL_MC_PARAM_CPE_INT, SAL_MC_PARAM_MECHANISM_INT, cpev, 0, 0);
611         if (isrv.status) {
612                 printk(KERN_ERR "Failed to register Corrected Platform "
613                        "Error interrupt vector with SAL (status %ld)\n", isrv.status);
614                 return;
615         }
616 
617         IA64_MCA_DEBUG("%s: corrected platform error "
618                        "vector %#x registered\n", __func__, cpev);
619 }
620 #endif /* CONFIG_ACPI */
621 
622 /*
623  * ia64_mca_cmc_vector_setup
624  *
625  *  Setup the corrected machine check vector register in the processor.
626  *  (The interrupt is masked on boot. ia64_mca_late_init unmask this.)
627  *  This function is invoked on a per-processor basis.
628  *
629  * Inputs
630  *      None
631  *
632  * Outputs
633  *      None
634  */
635 void __cpuinit
636 ia64_mca_cmc_vector_setup (void)
637 {
638         cmcv_reg_t      cmcv;
639 
640         cmcv.cmcv_regval        = 0;
641         cmcv.cmcv_mask          = 1;        /* Mask/disable interrupt at first */
642         cmcv.cmcv_vector        = IA64_CMC_VECTOR;
643         ia64_setreg(_IA64_REG_CR_CMCV, cmcv.cmcv_regval);
644 
645         IA64_MCA_DEBUG("%s: CPU %d corrected machine check vector %#x registered.\n",
646                        __func__, smp_processor_id(), IA64_CMC_VECTOR);
647 
648         IA64_MCA_DEBUG("%s: CPU %d CMCV = %#016lx\n",
649                        __func__, smp_processor_id(), ia64_getreg(_IA64_REG_CR_CMCV));
650 }
651 
652 /*
653  * ia64_mca_cmc_vector_disable
654  *
655  *  Mask the corrected machine check vector register in the processor.
656  *  This function is invoked on a per-processor basis.
657  *
658  * Inputs
659  *      dummy(unused)
660  *
661  * Outputs
662  *      None
663  */
664 static void
665 ia64_mca_cmc_vector_disable (void *dummy)
666 {
667         cmcv_reg_t      cmcv;
668 
669         cmcv.cmcv_regval = ia64_getreg(_IA64_REG_CR_CMCV);
670 
671         cmcv.cmcv_mask = 1; /* Mask/disable interrupt */
672         ia64_setreg(_IA64_REG_CR_CMCV, cmcv.cmcv_regval);
673 
674         IA64_MCA_DEBUG("%s: CPU %d corrected machine check vector %#x disabled.\n",
675                        __func__, smp_processor_id(), cmcv.cmcv_vector);
676 }
677 
678 /*
679  * ia64_mca_cmc_vector_enable
680  *
681  *  Unmask the corrected machine check vector register in the processor.
682  *  This function is invoked on a per-processor basis.
683  *
684  * Inputs
685  *      dummy(unused)
686  *
687  * Outputs
688  *      None
689  */
690 static void
691 ia64_mca_cmc_vector_enable (void *dummy)
692 {
693         cmcv_reg_t      cmcv;
694 
695         cmcv.cmcv_regval = ia64_getreg(_IA64_REG_CR_CMCV);
696 
697         cmcv.cmcv_mask = 0; /* Unmask/enable interrupt */
698         ia64_setreg(_IA64_REG_CR_CMCV, cmcv.cmcv_regval);
699 
700         IA64_MCA_DEBUG("%s: CPU %d corrected machine check vector %#x enabled.\n",
701                        __func__, smp_processor_id(), cmcv.cmcv_vector);
702 }
703 
704 /*
705  * ia64_mca_cmc_vector_disable_keventd
706  *
707  * Called via keventd (smp_call_function() is not safe in interrupt context) to
708  * disable the cmc interrupt vector.
709  */
710 static void
711 ia64_mca_cmc_vector_disable_keventd(struct work_struct *unused)
712 {
713         on_each_cpu(ia64_mca_cmc_vector_disable, NULL, 0);
714 }
715 
716 /*
717  * ia64_mca_cmc_vector_enable_keventd
718  *
719  * Called via keventd (smp_call_function() is not safe in interrupt context) to
720  * enable the cmc interrupt vector.
721  */
722 static void
723 ia64_mca_cmc_vector_enable_keventd(struct work_struct *unused)
724 {
725         on_each_cpu(ia64_mca_cmc_vector_enable, NULL, 0);
726 }
727 
728 /*
729  * ia64_mca_wakeup
730  *
731  *      Send an inter-cpu interrupt to wake-up a particular cpu.
732  *
733  *  Inputs  :   cpuid
734  *  Outputs :   None
735  */
736 static void
737 ia64_mca_wakeup(int cpu)
738 {
739         platform_send_ipi(cpu, IA64_MCA_WAKEUP_VECTOR, IA64_IPI_DM_INT, 0);
740 }
741 
742 /*
743  * ia64_mca_wakeup_all
744  *
745  *      Wakeup all the slave cpus which have rendez'ed previously.
746  *
747  *  Inputs  :   None
748  *  Outputs :   None
749  */
750 static void
751 ia64_mca_wakeup_all(void)
752 {
753         int cpu;
754 
755         /* Clear the Rendez checkin flag for all cpus */
756         for_each_online_cpu(cpu) {
757                 if (ia64_mc_info.imi_rendez_checkin[cpu] == IA64_MCA_RENDEZ_CHECKIN_DONE)
758                         ia64_mca_wakeup(cpu);
759         }
760 
761 }
762 
763 /*
764  * ia64_mca_rendez_interrupt_handler
765  *
766  *      This is handler used to put slave processors into spinloop
767  *      while the monarch processor does the mca handling and later
768  *      wake each slave up once the monarch is done.  The state
769  *      IA64_MCA_RENDEZ_CHECKIN_DONE indicates the cpu is rendez'ed
770  *      in SAL.  The state IA64_MCA_RENDEZ_CHECKIN_NOTDONE indicates
771  *      the cpu has come out of OS rendezvous.
772  *
773  *  Inputs  :   None
774  *  Outputs :   None
775  */
776 static irqreturn_t
777 ia64_mca_rendez_int_handler(int rendez_irq, void *arg)
778 {
779         unsigned long flags;
780         int cpu = smp_processor_id();
781         struct ia64_mca_notify_die nd =
782                 { .sos = NULL, .monarch_cpu = &monarch_cpu };
783 
784         /* Mask all interrupts */
785         local_irq_save(flags);
786 
787         NOTIFY_MCA(DIE_MCA_RENDZVOUS_ENTER, get_irq_regs(), (long)&nd, 1);
788 
789         ia64_mc_info.imi_rendez_checkin[cpu] = IA64_MCA_RENDEZ_CHECKIN_DONE;
790         /* Register with the SAL monarch that the slave has
791          * reached SAL
792          */
793         ia64_sal_mc_rendez();
794 
795         NOTIFY_MCA(DIE_MCA_RENDZVOUS_PROCESS, get_irq_regs(), (long)&nd, 1);
796 
797         /* Wait for the monarch cpu to exit. */
798         while (monarch_cpu != -1)
799                cpu_relax();     /* spin until monarch leaves */
800 
801         NOTIFY_MCA(DIE_MCA_RENDZVOUS_LEAVE, get_irq_regs(), (long)&nd, 1);
802 
803         ia64_mc_info.imi_rendez_checkin[cpu] = IA64_MCA_RENDEZ_CHECKIN_NOTDONE;
804         /* Enable all interrupts */
805         local_irq_restore(flags);
806         return IRQ_HANDLED;
807 }
808 
809 /*
810  * ia64_mca_wakeup_int_handler
811  *
812  *      The interrupt handler for processing the inter-cpu interrupt to the
813  *      slave cpu which was spinning in the rendez loop.
814  *      Since this spinning is done by turning off the interrupts and
815  *      polling on the wakeup-interrupt bit in the IRR, there is
816  *      nothing useful to be done in the handler.
817  *
818  *  Inputs  :   wakeup_irq  (Wakeup-interrupt bit)
819  *      arg             (Interrupt handler specific argument)
820  *  Outputs :   None
821  *
822  */
823 static irqreturn_t
824 ia64_mca_wakeup_int_handler(int wakeup_irq, void *arg)
825 {
826         return IRQ_HANDLED;
827 }
828 
829 /* Function pointer for extra MCA recovery */
830 int (*ia64_mca_ucmc_extension)
831         (void*,struct ia64_sal_os_state*)
832         = NULL;
833 
834 int
835 ia64_reg_MCA_extension(int (*fn)(void *, struct ia64_sal_os_state *))
836 {
837         if (ia64_mca_ucmc_extension)
838                 return 1;
839 
840         ia64_mca_ucmc_extension = fn;
841         return 0;
842 }
843 
844 void
845 ia64_unreg_MCA_extension(void)
846 {
847         if (ia64_mca_ucmc_extension)
848                 ia64_mca_ucmc_extension = NULL;
849 }
850 
851 EXPORT_SYMBOL(ia64_reg_MCA_extension);
852 EXPORT_SYMBOL(ia64_unreg_MCA_extension);
853 
854 
855 static inline void
856 copy_reg(const u64 *fr, u64 fnat, unsigned long *tr, unsigned long *tnat)
857 {
858         u64 fslot, tslot, nat;
859         *tr = *fr;
860         fslot = ((unsigned long)fr >> 3) & 63;
861         tslot = ((unsigned long)tr >> 3) & 63;
862         *tnat &= ~(1UL << tslot);
863         nat = (fnat >> fslot) & 1;
864         *tnat |= (nat << tslot);
865 }
866 
867 /* Change the comm field on the MCA/INT task to include the pid that
868  * was interrupted, it makes for easier debugging.  If that pid was 0
869  * (swapper or nested MCA/INIT) then use the start of the previous comm
870  * field suffixed with its cpu.
871  */
872 
873 static void
874 ia64_mca_modify_comm(const struct task_struct *previous_current)
875 {
876         char *p, comm[sizeof(current->comm)];
877         if (previous_current->pid)
878                 snprintf(comm, sizeof(comm), "%s %d",
879                         current->comm, previous_current->pid);
880         else {
881                 int l;
882                 if ((p = strchr(previous_current->comm, ' ')))
883                         l = p - previous_current->comm;
884                 else
885                         l = strlen(previous_current->comm);
886                 snprintf(comm, sizeof(comm), "%s %*s %d",
887                         current->comm, l, previous_current->comm,
888                         task_thread_info(previous_current)->cpu);
889         }
890         memcpy(current->comm, comm, sizeof(current->comm));
891 }
892 
893 static void
894 finish_pt_regs(struct pt_regs *regs, struct ia64_sal_os_state *sos,
895                 unsigned long *nat)
896 {
897         const pal_min_state_area_t *ms = sos->pal_min_state;
898         const u64 *bank;
899 
900         /* If ipsr.ic then use pmsa_{iip,ipsr,ifs}, else use
901          * pmsa_{xip,xpsr,xfs}
902          */
903         if (ia64_psr(regs)->ic) {
904                 regs->cr_iip = ms->pmsa_iip;
905                 regs->cr_ipsr = ms->pmsa_ipsr;
906                 regs->cr_ifs = ms->pmsa_ifs;
907         } else {
908                 regs->cr_iip = ms->pmsa_xip;
909                 regs->cr_ipsr = ms->pmsa_xpsr;
910                 regs->cr_ifs = ms->pmsa_xfs;
911 
912                 sos->iip = ms->pmsa_iip;
913                 sos->ipsr = ms->pmsa_ipsr;
914                 sos->ifs = ms->pmsa_ifs;
915         }
916         regs->pr = ms->pmsa_pr;
917         regs->b0 = ms->pmsa_br0;
918         regs->ar_rsc = ms->pmsa_rsc;
919         copy_reg(&ms->pmsa_gr[1-1], ms->pmsa_nat_bits, &regs->r1, nat);
920         copy_reg(&ms->pmsa_gr[2-1], ms->pmsa_nat_bits, &regs->r2, nat);
921         copy_reg(&ms->pmsa_gr[3-1], ms->pmsa_nat_bits, &regs->r3, nat);
922         copy_reg(&ms->pmsa_gr[8-1], ms->pmsa_nat_bits, &regs->r8, nat);
923         copy_reg(&ms->pmsa_gr[9-1], ms->pmsa_nat_bits, &regs->r9, nat);
924         copy_reg(&ms->pmsa_gr[10-1], ms->pmsa_nat_bits, &regs->r10, nat);
925         copy_reg(&ms->pmsa_gr[11-1], ms->pmsa_nat_bits, &regs->r11, nat);
926         copy_reg(&ms->pmsa_gr[12-1], ms->pmsa_nat_bits, &regs->r12, nat);
927         copy_reg(&ms->pmsa_gr[13-1], ms->pmsa_nat_bits, &regs->r13, nat);
928         copy_reg(&ms->pmsa_gr[14-1], ms->pmsa_nat_bits, &regs->r14, nat);
929         copy_reg(&ms->pmsa_gr[15-1], ms->pmsa_nat_bits, &regs->r15, nat);
930         if (ia64_psr(regs)->bn)
931                 bank = ms->pmsa_bank1_gr;
932         else
933                 bank = ms->pmsa_bank0_gr;
934         copy_reg(&bank[16-16], ms->pmsa_nat_bits, &regs->r16, nat);
935         copy_reg(&bank[17-16], ms->pmsa_nat_bits, &regs->r17, nat);
936         copy_reg(&bank[18-16], ms->pmsa_nat_bits, &regs->r18, nat);
937         copy_reg(&bank[19-16], ms->pmsa_nat_bits, &regs->r19, nat);
938         copy_reg(&bank[20-16], ms->pmsa_nat_bits, &regs->r20, nat);
939         copy_reg(&bank[21-16], ms->pmsa_nat_bits, &regs->r21, nat);
940         copy_reg(&bank[22-16], ms->pmsa_nat_bits, &regs->r22, nat);
941         copy_reg(&bank[23-16], ms->pmsa_nat_bits, &regs->r23, nat);
942         copy_reg(&bank[24-16], ms->pmsa_nat_bits, &regs->r24, nat);
943         copy_reg(&bank[25-16], ms->pmsa_nat_bits, &regs->r25, nat);
944         copy_reg(&bank[26-16], ms->pmsa_nat_bits, &regs->r26, nat);
945         copy_reg(&bank[27-16], ms->pmsa_nat_bits, &regs->r27, nat);
946         copy_reg(&bank[28-16], ms->pmsa_nat_bits, &regs->r28, nat);
947         copy_reg(&bank[29-16], ms->pmsa_nat_bits, &regs->r29, nat);
948         copy_reg(&bank[30-16], ms->pmsa_nat_bits, &regs->r30, nat);
949         copy_reg(&bank[31-16], ms->pmsa_nat_bits, &regs->r31, nat);
950 }
951 
952 /* On entry to this routine, we are running on the per cpu stack, see
953  * mca_asm.h.  The original stack has not been touched by this event.  Some of
954  * the original stack's registers will be in the RBS on this stack.  This stack
955  * also contains a partial pt_regs and switch_stack, the rest of the data is in
956  * PAL minstate.
957  *
958  * The first thing to do is modify the original stack to look like a blocked
959  * task so we can run backtrace on the original task.  Also mark the per cpu
960  * stack as current to ensure that we use the correct task state, it also means
961  * that we can do backtrace on the MCA/INIT handler code itself.
962  */
963 
964 static struct task_struct *
965 ia64_mca_modify_original_stack(struct pt_regs *regs,
966                 const struct switch_stack *sw,
967                 struct ia64_sal_os_state *sos,
968                 const char *type)
969 {
970         char *p;
971         ia64_va va;
972         extern char ia64_leave_kernel[];        /* Need asm address, not function descriptor */
973         const pal_min_state_area_t *ms = sos->pal_min_state;
974         struct task_struct *previous_current;
975         struct pt_regs *old_regs;
976         struct switch_stack *old_sw;
977         unsigned size = sizeof(struct pt_regs) +
978                         sizeof(struct switch_stack) + 16;
979         unsigned long *old_bspstore, *old_bsp;
980         unsigned long *new_bspstore, *new_bsp;
981         unsigned long old_unat, old_rnat, new_rnat, nat;
982         u64 slots, loadrs = regs->loadrs;
983         u64 r12 = ms->pmsa_gr[12-1], r13 = ms->pmsa_gr[13-1];
984         u64 ar_bspstore = regs->ar_bspstore;
985         u64 ar_bsp = regs->ar_bspstore + (loadrs >> 16);
986         const char *msg;
987         int cpu = smp_processor_id();
988 
989         previous_current = curr_task(cpu);
990         set_curr_task(cpu, current);
991         if ((p = strchr(current->comm, ' ')))
992                 *p = '\0';
993 
994         /* Best effort attempt to cope with MCA/INIT delivered while in
995          * physical mode.
996          */
997         regs->cr_ipsr = ms->pmsa_ipsr;
998         if (ia64_psr(regs)->dt == 0) {
999                 va.l = r12;
1000                 if (va.f.reg == 0) {
1001                         va.f.reg = 7;
1002                         r12 = va.l;
1003                 }
1004                 va.l = r13;
1005                 if (va.f.reg == 0) {
1006                         va.f.reg = 7;
1007                         r13 = va.l;
1008                 }
1009         }
1010         if (ia64_psr(regs)->rt == 0) {
1011                 va.l = ar_bspstore;
1012                 if (va.f.reg == 0) {
1013                         va.f.reg = 7;
1014                         ar_bspstore = va.l;
1015                 }
1016                 va.l = ar_bsp;
1017                 if (va.f.reg == 0) {
1018                         va.f.reg = 7;
1019                         ar_bsp = va.l;
1020                 }
1021         }
1022 
1023         /* mca_asm.S ia64_old_stack() cannot assume that the dirty registers
1024          * have been copied to the old stack, the old stack may fail the
1025          * validation tests below.  So ia64_old_stack() must restore the dirty
1026          * registers from the new stack.  The old and new bspstore probably
1027          * have different alignments, so loadrs calculated on the old bsp
1028          * cannot be used to restore from the new bsp.  Calculate a suitable
1029          * loadrs for the new stack and save it in the new pt_regs, where
1030          * ia64_old_stack() can get it.
1031          */
1032         old_bspstore = (unsigned long *)ar_bspstore;
1033         old_bsp = (unsigned long *)ar_bsp;
1034         slots = ia64_rse_num_regs(old_bspstore, old_bsp);
1035         new_bspstore = (unsigned long *)((u64)current + IA64_RBS_OFFSET);
1036         new_bsp = ia64_rse_skip_regs(new_bspstore, slots);
1037         regs->loadrs = (new_bsp - new_bspstore) * 8 << 16;
1038 
1039         /* Verify the previous stack state before we change it */
1040         if (user_mode(regs)) {
1041                 msg = "occurred in user space";
1042                 /* previous_current is guaranteed to be valid when the task was
1043                  * in user space, so ...
1044                  */
1045                 ia64_mca_modify_comm(previous_current);
1046                 goto no_mod;
1047         }
1048 
1049         if (r13 != sos->prev_IA64_KR_CURRENT) {
1050                 msg = "inconsistent previous current and r13";
1051                 goto no_mod;
1052         }
1053 
1054         if (!mca_recover_range(ms->pmsa_iip)) {
1055                 if ((r12 - r13) >= KERNEL_STACK_SIZE) {
1056                         msg = "inconsistent r12 and r13";
1057                         goto no_mod;
1058                 }
1059                 if ((ar_bspstore - r13) >= KERNEL_STACK_SIZE) {
1060                         msg = "inconsistent ar.bspstore and r13";
1061                         goto no_mod;
1062                 }
1063                 va.p = old_bspstore;
1064                 if (va.f.reg < 5) {
1065                         msg = "old_bspstore is in the wrong region";
1066                         goto no_mod;
1067                 }
1068                 if ((ar_bsp - r13) >= KERNEL_STACK_SIZE) {
1069                         msg = "inconsistent ar.bsp and r13";
1070                         goto no_mod;
1071                 }
1072                 size += (ia64_rse_skip_regs(old_bspstore, slots) - old_bspstore) * 8;
1073                 if (ar_bspstore + size > r12) {
1074                         msg = "no room for blocked state";
1075                         goto no_mod;
1076                 }
1077         }
1078 
1079         ia64_mca_modify_comm(previous_current);
1080 
1081         /* Make the original task look blocked.  First stack a struct pt_regs,
1082          * describing the state at the time of interrupt.  mca_asm.S built a
1083          * partial pt_regs, copy it and fill in the blanks using minstate.
1084          */
1085         p = (char *)r12 - sizeof(*regs);
1086         old_regs = (struct pt_regs *)p;
1087         memcpy(old_regs, regs, sizeof(*regs));
1088         old_regs->loadrs = loadrs;
1089         old_unat = old_regs->ar_unat;
1090         finish_pt_regs(old_regs, sos, &old_unat);
1091 
1092         /* Next stack a struct switch_stack.  mca_asm.S built a partial
1093          * switch_stack, copy it and fill in the blanks using pt_regs and
1094          * minstate.
1095          *
1096          * In the synthesized switch_stack, b0 points to ia64_leave_kernel,
1097          * ar.pfs is set to 0.
1098          *
1099          * unwind.c::unw_unwind() does special processing for interrupt frames.
1100          * It checks if the PRED_NON_SYSCALL predicate is set, if the predicate
1101          * is clear then unw_unwind() does _not_ adjust bsp over pt_regs.  Not
1102          * that this is documented, of course.  Set PRED_NON_SYSCALL in the
1103          * switch_stack on the original stack so it will unwind correctly when
1104          * unwind.c reads pt_regs.
1105          *
1106          * thread.ksp is updated to point to the synthesized switch_stack.
1107          */
1108         p -= sizeof(struct switch_stack);
1109         old_sw = (struct switch_stack *)p;
1110         memcpy(old_sw, sw, sizeof(*sw));
1111         old_sw->caller_unat = old_unat;
1112         old_sw->ar_fpsr = old_regs->ar_fpsr;
1113         copy_reg(&ms->pmsa_gr[4-1], ms->pmsa_nat_bits, &old_sw->r4, &old_unat);
1114         copy_reg(&ms->pmsa_gr[5-1], ms->pmsa_nat_bits, &old_sw->r5, &old_unat);
1115         copy_reg(&ms->pmsa_gr[6-1], ms->pmsa_nat_bits, &old_sw->r6, &old_unat);
1116         copy_reg(&ms->pmsa_gr[7-1], ms->pmsa_nat_bits, &old_sw->r7, &old_unat);
1117         old_sw->b0 = (u64)ia64_leave_kernel;
1118         old_sw->b1 = ms->pmsa_br1;
1119         old_sw->ar_pfs = 0;
1120         old_sw->ar_unat = old_unat;
1121         old_sw->pr = old_regs->pr | (1UL << PRED_NON_SYSCALL);
1122         previous_current->thread.ksp = (u64)p - 16;
1123 
1124         /* Finally copy the original stack's registers back to its RBS.
1125          * Registers from ar.bspstore through ar.bsp at the time of the event
1126          * are in the current RBS, copy them back to the original stack.  The
1127          * copy must be done register by register because the original bspstore
1128          * and the current one have different alignments, so the saved RNAT
1129          * data occurs at different places.
1130          *
1131          * mca_asm does cover, so the old_bsp already includes all registers at
1132          * the time of MCA/INIT.  It also does flushrs, so all registers before
1133          * this function have been written to backing store on the MCA/INIT
1134          * stack.
1135          */
1136         new_rnat = ia64_get_rnat(ia64_rse_rnat_addr(new_bspstore));
1137         old_rnat = regs->ar_rnat;
1138         while (slots--) {
1139                 if (ia64_rse_is_rnat_slot(new_bspstore)) {
1140                         new_rnat = ia64_get_rnat(new_bspstore++);
1141                 }
1142                 if (ia64_rse_is_rnat_slot(old_bspstore)) {
1143                         *old_bspstore++ = old_rnat;
1144                         old_rnat = 0;
1145                 }
1146                 nat = (new_rnat >> ia64_rse_slot_num(new_bspstore)) & 1UL;
1147                 old_rnat &= ~(1UL << ia64_rse_slot_num(old_bspstore));
1148                 old_rnat |= (nat << ia64_rse_slot_num(old_bspstore));
1149                 *old_bspstore++ = *new_bspstore++;
1150         }
1151         old_sw->ar_bspstore = (unsigned long)old_bspstore;
1152         old_sw->ar_rnat = old_rnat;
1153 
1154         sos->prev_task = previous_current;
1155         return previous_current;
1156 
1157 no_mod:
1158         mprintk(KERN_INFO "cpu %d, %s %s, original stack not modified\n",
1159                         smp_processor_id(), type, msg);
1160         old_unat = regs->ar_unat;
1161         finish_pt_regs(regs, sos, &old_unat);
1162         return previous_current;
1163 }
1164 
1165 /* The monarch/slave interaction is based on monarch_cpu and requires that all
1166  * slaves have entered rendezvous before the monarch leaves.  If any cpu has
1167  * not entered rendezvous yet then wait a bit.  The assumption is that any
1168  * slave that has not rendezvoused after a reasonable time is never going to do
1169  * so.  In this context, slave includes cpus that respond to the MCA rendezvous
1170  * interrupt, as well as cpus that receive the INIT slave event.
1171  */
1172 
1173 static void
1174 ia64_wait_for_slaves(int monarch, const char *type)
1175 {
1176         int c, i , wait;
1177 
1178         /*
1179          * wait 5 seconds total for slaves (arbitrary)
1180          */
1181         for (i = 0; i < 5000; i++) {
1182                 wait = 0;
1183                 for_each_online_cpu(c) {
1184                         if (c == monarch)
1185                                 continue;
1186                         if (ia64_mc_info.imi_rendez_checkin[c]
1187                                         == IA64_MCA_RENDEZ_CHECKIN_NOTDONE) {
1188                                 udelay(1000);           /* short wait */
1189                                 wait = 1;
1190                                 break;
1191                         }
1192                 }
1193                 if (!wait)
1194                         goto all_in;
1195         }
1196 
1197         /*
1198          * Maybe slave(s) dead. Print buffered messages immediately.
1199          */
1200         ia64_mlogbuf_finish(0);
1201         mprintk(KERN_INFO "OS %s slave did not rendezvous on cpu", type);
1202         for_each_online_cpu(c) {
1203                 if (c == monarch)
1204                         continue;
1205                 if (ia64_mc_info.imi_rendez_checkin[c] == IA64_MCA_RENDEZ_CHECKIN_NOTDONE)
1206                         mprintk(" %d", c);
1207         }
1208         mprintk("\n");
1209         return;
1210 
1211 all_in:
1212         mprintk(KERN_INFO "All OS %s slaves have reached rendezvous\n", type);
1213         return;
1214 }
1215 
1216 /*  mca_insert_tr
1217  *
1218  *  Switch rid when TR reload and needed!
1219  *  iord: 1: itr, 2: itr;
1220  *
1221 */
1222 static void mca_insert_tr(u64 iord)
1223 {
1224 
1225         int i;
1226         u64 old_rr;
1227         struct ia64_tr_entry *p;
1228         unsigned long psr;
1229         int cpu = smp_processor_id();
1230 
1231         if (!ia64_idtrs[cpu])
1232                 return;
1233 
1234         psr = ia64_clear_ic();
1235         for (i = IA64_TR_ALLOC_BASE; i < IA64_TR_ALLOC_MAX; i++) {
1236                 p = ia64_idtrs[cpu] + (iord - 1) * IA64_TR_ALLOC_MAX;
1237                 if (p->pte & 0x1) {
1238                         old_rr = ia64_get_rr(p->ifa);
1239                         if (old_rr != p->rr) {
1240                                 ia64_set_rr(p->ifa, p->rr);
1241                                 ia64_srlz_d();
1242                         }
1243                         ia64_ptr(iord, p->ifa, p->itir >> 2);
1244                         ia64_srlz_i();
1245                         if (iord & 0x1) {
1246                                 ia64_itr(0x1, i, p->ifa, p->pte, p->itir >> 2);
1247                                 ia64_srlz_i();
1248                         }
1249                         if (iord & 0x2) {
1250                                 ia64_itr(0x2, i, p->ifa, p->pte, p->itir >> 2);
1251                                 ia64_srlz_i();
1252                         }
1253                         if (old_rr != p->rr) {
1254                                 ia64_set_rr(p->ifa, old_rr);
1255                                 ia64_srlz_d();
1256                         }
1257                 }
1258         }
1259         ia64_set_psr(psr);
1260 }
1261 
1262 /*
1263  * ia64_mca_handler
1264  *
1265  *      This is uncorrectable machine check handler called from OS_MCA
1266  *      dispatch code which is in turn called from SAL_CHECK().
1267  *      This is the place where the core of OS MCA handling is done.
1268  *      Right now the logs are extracted and displayed in a well-defined
1269  *      format. This handler code is supposed to be run only on the
1270  *      monarch processor. Once the monarch is done with MCA handling
1271  *      further MCA logging is enabled by clearing logs.
1272  *      Monarch also has the duty of sending wakeup-IPIs to pull the
1273  *      slave processors out of rendezvous spinloop.
1274  *
1275  *      If multiple processors call into OS_MCA, the first will become
1276  *      the monarch.  Subsequent cpus will be recorded in the mca_cpu
1277  *      bitmask.  After the first monarch has processed its MCA, it
1278  *      will wake up the next cpu in the mca_cpu bitmask and then go
1279  *      into the rendezvous loop.  When all processors have serviced
1280  *      their MCA, the last monarch frees up the rest of the processors.
1281  */
1282 void
1283 ia64_mca_handler(struct pt_regs *regs, struct switch_stack *sw,
1284                  struct ia64_sal_os_state *sos)
1285 {
1286         int recover, cpu = smp_processor_id();
1287         struct task_struct *previous_current;
1288         struct ia64_mca_notify_die nd =
1289                 { .sos = sos, .monarch_cpu = &monarch_cpu, .data = &recover };
1290         static atomic_t mca_count;
1291         static cpumask_t mca_cpu;
1292 
1293         if (atomic_add_return(1, &mca_count) == 1) {
1294                 monarch_cpu = cpu;
1295                 sos->monarch = 1;
1296         } else {
1297                 cpu_set(cpu, mca_cpu);
1298                 sos->monarch = 0;
1299         }
1300         mprintk(KERN_INFO "Entered OS MCA handler. PSP=%lx cpu=%d "
1301                 "monarch=%ld\n", sos->proc_state_param, cpu, sos->monarch);
1302 
1303         previous_current = ia64_mca_modify_original_stack(regs, sw, sos, "MCA");
1304 
1305         NOTIFY_MCA(DIE_MCA_MONARCH_ENTER, regs, (long)&nd, 1);
1306 
1307         ia64_mc_info.imi_rendez_checkin[cpu] = IA64_MCA_RENDEZ_CHECKIN_CONCURRENT_MCA;
1308         if (sos->monarch) {
1309                 ia64_wait_for_slaves(cpu, "MCA");
1310 
1311                 /* Wakeup all the processors which are spinning in the
1312                  * rendezvous loop.  They will leave SAL, then spin in the OS
1313                  * with interrupts disabled until this monarch cpu leaves the
1314                  * MCA handler.  That gets control back to the OS so we can
1315                  * backtrace the other cpus, backtrace when spinning in SAL
1316                  * does not work.
1317                  */
1318                 ia64_mca_wakeup_all();
1319         } else {
1320                 while (cpu_isset(cpu, mca_cpu))
1321                         cpu_relax();    /* spin until monarch wakes us */
1322         }
1323 
1324         NOTIFY_MCA(DIE_MCA_MONARCH_PROCESS, regs, (long)&nd, 1);
1325 
1326         /* Get the MCA error record and log it */
1327         ia64_mca_log_sal_error_record(SAL_INFO_TYPE_MCA);
1328 
1329         /* MCA error recovery */
1330         recover = (ia64_mca_ucmc_extension
1331                 && ia64_mca_ucmc_extension(
1332                         IA64_LOG_CURR_BUFFER(SAL_INFO_TYPE_MCA),
1333                         sos));
1334 
1335         if (recover) {
1336                 sal_log_record_header_t *rh = IA64_LOG_CURR_BUFFER(SAL_INFO_TYPE_MCA);
1337                 rh->severity = sal_log_severity_corrected;
1338                 ia64_sal_clear_state_info(SAL_INFO_TYPE_MCA);
1339                 sos->os_status = IA64_MCA_CORRECTED;
1340         } else {
1341                 /* Dump buffered message to console */
1342                 ia64_mlogbuf_finish(1);
1343         }
1344 
1345         if (__get_cpu_var(ia64_mca_tr_reload)) {
1346                 mca_insert_tr(0x1); /*Reload dynamic itrs*/
1347                 mca_insert_tr(0x2); /*Reload dynamic itrs*/
1348         }
1349 
1350         NOTIFY_MCA(DIE_MCA_MONARCH_LEAVE, regs, (long)&nd, 1);
1351 
1352         if (atomic_dec_return(&mca_count) > 0) {
1353                 int i;
1354 
1355                 /* wake up the next monarch cpu,
1356                  * and put this cpu in the rendez loop.
1357                  */
1358                 for_each_online_cpu(i) {
1359                         if (cpu_isset(i, mca_cpu)) {
1360                                 monarch_cpu = i;
1361                                 cpu_clear(i, mca_cpu);  /* wake next cpu */
1362                                 while (monarch_cpu != -1)
1363                                         cpu_relax();    /* spin until last cpu leaves */
1364                                 set_curr_task(cpu, previous_current);
1365                                 ia64_mc_info.imi_rendez_checkin[cpu]
1366                                                 = IA64_MCA_RENDEZ_CHECKIN_NOTDONE;
1367                                 return;
1368                         }
1369                 }
1370         }
1371         set_curr_task(cpu, previous_current);
1372         ia64_mc_info.imi_rendez_checkin[cpu] = IA64_MCA_RENDEZ_CHECKIN_NOTDONE;
1373         monarch_cpu = -1;       /* This frees the slaves and previous monarchs */
1374 }
1375 
1376 static DECLARE_WORK(cmc_disable_work, ia64_mca_cmc_vector_disable_keventd);
1377 static DECLARE_WORK(cmc_enable_work, ia64_mca_cmc_vector_enable_keventd);
1378 
1379 /*
1380  * ia64_mca_cmc_int_handler
1381  *
1382  *  This is corrected machine check interrupt handler.
1383  *      Right now the logs are extracted and displayed in a well-defined
1384  *      format.
1385  *
1386  * Inputs
1387  *      interrupt number
1388  *      client data arg ptr
1389  *
1390  * Outputs
1391  *      None
1392  */
1393 static irqreturn_t
1394 ia64_mca_cmc_int_handler(int cmc_irq, void *arg)
1395 {
1396         static unsigned long    cmc_history[CMC_HISTORY_LENGTH];
1397         static int              index;
1398         static DEFINE_SPINLOCK(cmc_history_lock);
1399 
1400         IA64_MCA_DEBUG("%s: received interrupt vector = %#x on CPU %d\n",
1401                        __func__, cmc_irq, smp_processor_id());
1402 
1403         /* SAL spec states this should run w/ interrupts enabled */
1404         local_irq_enable();
1405 
1406         spin_lock(&cmc_history_lock);
1407         if (!cmc_polling_enabled) {
1408                 int i, count = 1; /* we know 1 happened now */
1409                 unsigned long now = jiffies;
1410 
1411                 for (i = 0; i < CMC_HISTORY_LENGTH; i++) {
1412                         if (now - cmc_history[i] <= HZ)
1413                                 count++;
1414                 }
1415 
1416                 IA64_MCA_DEBUG(KERN_INFO "CMC threshold %d/%d\n", count, CMC_HISTORY_LENGTH);
1417                 if (count >= CMC_HISTORY_LENGTH) {
1418 
1419                         cmc_polling_enabled = 1;
1420                         spin_unlock(&cmc_history_lock);
1421                         /* If we're being hit with CMC interrupts, we won't
1422                          * ever execute the schedule_work() below.  Need to
1423                          * disable CMC interrupts on this processor now.
1424                          */
1425                         ia64_mca_cmc_vector_disable(NULL);
1426                         schedule_work(&cmc_disable_work);
1427 
1428                         /*
1429                          * Corrected errors will still be corrected, but
1430                          * make sure there's a log somewhere that indicates
1431                          * something is generating more than we can handle.
1432                          */
1433                         printk(KERN_WARNING "WARNING: Switching to polling CMC handler; error records may be lost\n");
1434 
1435                         mod_timer(&cmc_poll_timer, jiffies + CMC_POLL_INTERVAL);
1436 
1437                         /* lock already released, get out now */
1438                         goto out;
1439                 } else {
1440                         cmc_history[index++] = now;
1441                         if (index == CMC_HISTORY_LENGTH)
1442                                 index = 0;
1443                 }
1444         }
1445         spin_unlock(&cmc_history_lock);
1446 out:
1447         /* Get the CMC error record and log it */
1448         ia64_mca_log_sal_error_record(SAL_INFO_TYPE_CMC);
1449 
1450         return IRQ_HANDLED;
1451 }
1452 
1453 /*
1454  *  ia64_mca_cmc_int_caller
1455  *
1456  *      Triggered by sw interrupt from CMC polling routine.  Calls
1457  *      real interrupt handler and either triggers a sw interrupt
1458  *      on the next cpu or does cleanup at the end.
1459  *
1460  * Inputs
1461  *      interrupt number
1462  *      client data arg ptr
1463  * Outputs
1464  *      handled
1465  */
1466 static irqreturn_t
1467 ia64_mca_cmc_int_caller(int cmc_irq, void *arg)
1468 {
1469         static int start_count = -1;
1470         unsigned int cpuid;
1471 
1472         cpuid = smp_processor_id();
1473 
1474         /* If first cpu, update count */
1475         if (start_count == -1)
1476                 start_count = IA64_LOG_COUNT(SAL_INFO_TYPE_CMC);
1477 
1478         ia64_mca_cmc_int_handler(cmc_irq, arg);
1479 
1480         cpuid = cpumask_next(cpuid+1, cpu_online_mask);
1481 
1482         if (cpuid < nr_cpu_ids) {
1483                 platform_send_ipi(cpuid, IA64_CMCP_VECTOR, IA64_IPI_DM_INT, 0);
1484         } else {
1485                 /* If no log record, switch out of polling mode */
1486                 if (start_count == IA64_LOG_COUNT(SAL_INFO_TYPE_CMC)) {
1487 
1488                         printk(KERN_WARNING "Returning to interrupt driven CMC handler\n");
1489                         schedule_work(&cmc_enable_work);
1490                         cmc_polling_enabled = 0;
1491 
1492                 } else {
1493 
1494                         mod_timer(&cmc_poll_timer, jiffies + CMC_POLL_INTERVAL);
1495                 }
1496 
1497                 start_count = -1;
1498         }
1499 
1500         return IRQ_HANDLED;
1501 }
1502 
1503 /*
1504  *  ia64_mca_cmc_poll
1505  *
1506  *      Poll for Corrected Machine Checks (CMCs)
1507  *
1508  * Inputs   :   dummy(unused)
1509  * Outputs  :   None
1510  *
1511  */
1512 static void
1513 ia64_mca_cmc_poll (unsigned long dummy)
1514 {
1515         /* Trigger a CMC interrupt cascade  */
1516         platform_send_ipi(first_cpu(cpu_online_map), IA64_CMCP_VECTOR, IA64_IPI_DM_INT, 0);
1517 }
1518 
1519 /*
1520  *  ia64_mca_cpe_int_caller
1521  *
1522  *      Triggered by sw interrupt from CPE polling routine.  Calls
1523  *      real interrupt handler and either triggers a sw interrupt
1524  *      on the next cpu or does cleanup at the end.
1525  *
1526  * Inputs
1527  *      interrupt number
1528  *      client data arg ptr
1529  * Outputs
1530  *      handled
1531  */
1532 #ifdef CONFIG_ACPI
1533 
1534 static irqreturn_t
1535 ia64_mca_cpe_int_caller(int cpe_irq, void *arg)
1536 {
1537         static int start_count = -1;
1538         static int poll_time = MIN_CPE_POLL_INTERVAL;
1539         unsigned int cpuid;
1540 
1541         cpuid = smp_processor_id();
1542 
1543         /* If first cpu, update count */
1544         if (start_count == -1)
1545                 start_count = IA64_LOG_COUNT(SAL_INFO_TYPE_CPE);
1546 
1547         ia64_mca_cpe_int_handler(cpe_irq, arg);
1548 
1549         cpuid = cpumask_next(cpuid+1, cpu_online_mask);
1550 
1551         if (cpuid < NR_CPUS) {
1552                 platform_send_ipi(cpuid, IA64_CPEP_VECTOR, IA64_IPI_DM_INT, 0);
1553         } else {
1554                 /*
1555                  * If a log was recorded, increase our polling frequency,
1556                  * otherwise, backoff or return to interrupt mode.
1557                  */
1558                 if (start_count != IA64_LOG_COUNT(SAL_INFO_TYPE_CPE)) {
1559                         poll_time = max(MIN_CPE_POLL_INTERVAL, poll_time / 2);
1560                 } else if (cpe_vector < 0) {
1561                         poll_time = min(MAX_CPE_POLL_INTERVAL, poll_time * 2);
1562                 } else {
1563                         poll_time = MIN_CPE_POLL_INTERVAL;
1564 
1565                         printk(KERN_WARNING "Returning to interrupt driven CPE handler\n");
1566                         enable_irq(local_vector_to_irq(IA64_CPE_VECTOR));
1567                         cpe_poll_enabled = 0;
1568                 }
1569 
1570                 if (cpe_poll_enabled)
1571                         mod_timer(&cpe_poll_timer, jiffies + poll_time);
1572                 start_count = -1;
1573         }
1574 
1575         return IRQ_HANDLED;
1576 }
1577 
1578 /*
1579  *  ia64_mca_cpe_poll
1580  *
1581  *      Poll for Corrected Platform Errors (CPEs), trigger interrupt
1582  *      on first cpu, from there it will trickle through all the cpus.
1583  *
1584  * Inputs   :   dummy(unused)
1585  * Outputs  :   None
1586  *
1587  */
1588 static void
1589 ia64_mca_cpe_poll (unsigned long dummy)
1590 {
1591         /* Trigger a CPE interrupt cascade  */
1592         platform_send_ipi(first_cpu(cpu_online_map), IA64_CPEP_VECTOR, IA64_IPI_DM_INT, 0);
1593 }
1594 
1595 #endif /* CONFIG_ACPI */
1596 
1597 static int
1598 default_monarch_init_process(struct notifier_block *self, unsigned long val, void *data)
1599 {
1600         int c;
1601         struct task_struct *g, *t;
1602         if (val != DIE_INIT_MONARCH_PROCESS)
1603                 return NOTIFY_DONE;
1604 #ifdef CONFIG_KEXEC
1605         if (atomic_read(&kdump_in_progress))
1606                 return NOTIFY_DONE;
1607 #endif
1608 
1609         /*
1610          * FIXME: mlogbuf will brim over with INIT stack dumps.
1611          * To enable show_stack from INIT, we use oops_in_progress which should
1612          * be used in real oops. This would cause something wrong after INIT.
1613          */
1614         BREAK_LOGLEVEL(console_loglevel);
1615         ia64_mlogbuf_dump_from_init();
1616 
1617         printk(KERN_ERR "Processes interrupted by INIT -");
1618         for_each_online_cpu(c) {
1619                 struct ia64_sal_os_state *s;
1620                 t = __va(__per_cpu_mca[c] + IA64_MCA_CPU_INIT_STACK_OFFSET);
1621                 s = (struct ia64_sal_os_state *)((char *)t + MCA_SOS_OFFSET);
1622                 g = s->prev_task;
1623                 if (g) {
1624                         if (g->pid)
1625                                 printk(" %d", g->pid);
1626                         else
1627                                 printk(" %d (cpu %d task 0x%p)", g->pid, task_cpu(g), g);
1628                 }
1629         }
1630         printk("\n\n");
1631         if (read_trylock(&tasklist_lock)) {
1632                 do_each_thread (g, t) {
1633                         printk("\nBacktrace of pid %d (%s)\n", t->pid, t->comm);
1634                         show_stack(t, NULL);
1635                 } while_each_thread (g, t);
1636                 read_unlock(&tasklist_lock);
1637         }
1638         /* FIXME: This will not restore zapped printk locks. */
1639         RESTORE_LOGLEVEL(console_loglevel);
1640         return NOTIFY_DONE;
1641 }
1642 
1643 /*
1644  * C portion of the OS INIT handler
1645  *
1646  * Called from ia64_os_init_dispatch
1647  *
1648  * Inputs: pointer to pt_regs where processor info was saved.  SAL/OS state for
1649  * this event.  This code is used for both monarch and slave INIT events, see
1650  * sos->monarch.
1651  *
1652  * All INIT events switch to the INIT stack and change the previous process to
1653  * blocked status.  If one of the INIT events is the monarch then we are
1654  * probably processing the nmi button/command.  Use the monarch cpu to dump all
1655  * the processes.  The slave INIT events all spin until the monarch cpu
1656  * returns.  We can also get INIT slave events for MCA, in which case the MCA
1657  * process is the monarch.
1658  */
1659 
1660 void
1661 ia64_init_handler(struct pt_regs *regs, struct switch_stack *sw,
1662                   struct ia64_sal_os_state *sos)
1663 {
1664         static atomic_t slaves;
1665         static atomic_t monarchs;
1666         struct task_struct *previous_current;
1667         int cpu = smp_processor_id();
1668         struct ia64_mca_notify_die nd =
1669                 { .sos = sos, .monarch_cpu = &monarch_cpu };
1670 
1671         NOTIFY_INIT(DIE_INIT_ENTER, regs, (long)&nd, 0);
1672 
1673         mprintk(KERN_INFO "Entered OS INIT handler. PSP=%lx cpu=%d monarch=%ld\n",
1674                 sos->proc_state_param, cpu, sos->monarch);
1675         salinfo_log_wakeup(SAL_INFO_TYPE_INIT, NULL, 0, 0);
1676 
1677         previous_current = ia64_mca_modify_original_stack(regs, sw, sos, "INIT");
1678         sos->os_status = IA64_INIT_RESUME;
1679 
1680         /* FIXME: Workaround for broken proms that drive all INIT events as
1681          * slaves.  The last slave that enters is promoted to be a monarch.
1682          * Remove this code in September 2006, that gives platforms a year to
1683          * fix their proms and get their customers updated.
1684          */
1685         if (!sos->monarch && atomic_add_return(1, &slaves) == num_online_cpus()) {
1686                 mprintk(KERN_WARNING "%s: Promoting cpu %d to monarch.\n",
1687                         __func__, cpu);
1688                 atomic_dec(&slaves);
1689                 sos->monarch = 1;
1690         }
1691 
1692         /* FIXME: Workaround for broken proms that drive all INIT events as
1693          * monarchs.  Second and subsequent monarchs are demoted to slaves.
1694          * Remove this code in September 2006, that gives platforms a year to
1695          * fix their proms and get their customers updated.
1696          */
1697         if (sos->monarch && atomic_add_return(1, &monarchs) > 1) {
1698                 mprintk(KERN_WARNING "%s: Demoting cpu %d to slave.\n",
1699                                __func__, cpu);
1700                 atomic_dec(&monarchs);
1701                 sos->monarch = 0;
1702         }
1703 
1704         if (!sos->monarch) {
1705                 ia64_mc_info.imi_rendez_checkin[cpu] = IA64_MCA_RENDEZ_CHECKIN_INIT;
1706 
1707 #ifdef CONFIG_KEXEC
1708                 while (monarch_cpu == -1 && !atomic_read(&kdump_in_progress))
1709                         udelay(1000);
1710 #else
1711                 while (monarch_cpu == -1)
1712                         cpu_relax();    /* spin until monarch enters */
1713 #endif
1714 
1715                 NOTIFY_INIT(DIE_INIT_SLAVE_ENTER, regs, (long)&nd, 1);
1716                 NOTIFY_INIT(DIE_INIT_SLAVE_PROCESS, regs, (long)&nd, 1);
1717 
1718 #ifdef CONFIG_KEXEC
1719                 while (monarch_cpu != -1 && !atomic_read(&kdump_in_progress))
1720                         udelay(1000);
1721 #else
1722                 while (monarch_cpu != -1)
1723                         cpu_relax();    /* spin until monarch leaves */
1724 #endif
1725 
1726                 NOTIFY_INIT(DIE_INIT_SLAVE_LEAVE, regs, (long)&nd, 1);
1727 
1728                 mprintk("Slave on cpu %d returning to normal service.\n", cpu);
1729                 set_curr_task(cpu, previous_current);
1730                 ia64_mc_info.imi_rendez_checkin[cpu] = IA64_MCA_RENDEZ_CHECKIN_NOTDONE;
1731                 atomic_dec(&slaves);
1732                 return;
1733         }
1734 
1735         monarch_cpu = cpu;
1736         NOTIFY_INIT(DIE_INIT_MONARCH_ENTER, regs, (long)&nd, 1);
1737 
1738         /*
1739          * Wait for a bit.  On some machines (e.g., HP's zx2000 and zx6000, INIT can be
1740          * generated via the BMC's command-line interface, but since the console is on the
1741          * same serial line, the user will need some time to switch out of the BMC before
1742          * the dump begins.
1743          */
1744         mprintk("Delaying for 5 seconds...\n");
1745         udelay(5*1000000);
1746         ia64_wait_for_slaves(cpu, "INIT");
1747         /* If nobody intercepts DIE_INIT_MONARCH_PROCESS then we drop through
1748          * to default_monarch_init_process() above and just print all the
1749          * tasks.
1750          */
1751         NOTIFY_INIT(DIE_INIT_MONARCH_PROCESS, regs, (long)&nd, 1);
1752         NOTIFY_INIT(DIE_INIT_MONARCH_LEAVE, regs, (long)&nd, 1);
1753 
1754         mprintk("\nINIT dump complete.  Monarch on cpu %d returning to normal service.\n", cpu);
1755         atomic_dec(&monarchs);
1756         set_curr_task(cpu, previous_current);
1757         monarch_cpu = -1;
1758         return;
1759 }
1760 
1761 static int __init
1762 ia64_mca_disable_cpe_polling(char *str)
1763 {
1764         cpe_poll_enabled = 0;
1765         return 1;
1766 }
1767 
1768 __setup("disable_cpe_poll", ia64_mca_disable_cpe_polling);
1769 
1770 static struct irqaction cmci_irqaction = {
1771         .handler =      ia64_mca_cmc_int_handler,
1772         .flags =        IRQF_DISABLED,
1773         .name =         "cmc_hndlr"
1774 };
1775 
1776 static struct irqaction cmcp_irqaction = {
1777         .handler =      ia64_mca_cmc_int_caller,
1778         .flags =        IRQF_DISABLED,
1779         .name =         "cmc_poll"
1780 };
1781 
1782 static struct irqaction mca_rdzv_irqaction = {
1783         .handler =      ia64_mca_rendez_int_handler,
1784         .flags =        IRQF_DISABLED,
1785         .name =         "mca_rdzv"
1786 };
1787 
1788 static struct irqaction mca_wkup_irqaction = {
1789         .handler =      ia64_mca_wakeup_int_handler,
1790         .flags =        IRQF_DISABLED,
1791         .name =         "mca_wkup"
1792 };
1793 
1794 #ifdef CONFIG_ACPI
1795 static struct irqaction mca_cpe_irqaction = {
1796         .handler =      ia64_mca_cpe_int_handler,
1797         .flags =        IRQF_DISABLED,
1798         .name =         "cpe_hndlr"
1799 };
1800 
1801 static struct irqaction mca_cpep_irqaction = {
1802         .handler =      ia64_mca_cpe_int_caller,
1803         .flags =        IRQF_DISABLED,
1804         .name =         "cpe_poll"
1805 };
1806 #endif /* CONFIG_ACPI */
1807 
1808 /* Minimal format of the MCA/INIT stacks.  The pseudo processes that run on
1809  * these stacks can never sleep, they cannot return from the kernel to user
1810  * space, they do not appear in a normal ps listing.  So there is no need to
1811  * format most of the fields.
1812  */
1813 
1814 static void __cpuinit
1815 format_mca_init_stack(void *mca_data, unsigned long offset,
1816                 const char *type, int cpu)
1817 {
1818         struct task_struct *p = (struct task_struct *)((char *)mca_data + offset);
1819         struct thread_info *ti;
1820         memset(p, 0, KERNEL_STACK_SIZE);
1821         ti = task_thread_info(p);
1822         ti->flags = _TIF_MCA_INIT;
1823         ti->preempt_count = 1;
1824         ti->task = p;
1825         ti->cpu = cpu;
1826         p->stack = ti;
1827         p->state = TASK_UNINTERRUPTIBLE;
1828         cpu_set(cpu, p->cpus_allowed);
1829         INIT_LIST_HEAD(&p->tasks);
1830         p->parent = p->real_parent = p->group_leader = p;
1831         INIT_LIST_HEAD(&p->children);
1832         INIT_LIST_HEAD(&p->sibling);
1833         strncpy(p->comm, type, sizeof(p->comm)-1);
1834 }
1835 
1836 /* Caller prevents this from being called after init */
1837 static void * __init_refok mca_bootmem(void)
1838 {
1839         return __alloc_bootmem(sizeof(struct ia64_mca_cpu),
1840                             KERNEL_STACK_SIZE, 0);
1841 }
1842 
1843 /* Do per-CPU MCA-related initialization.  */
1844 void __cpuinit
1845 ia64_mca_cpu_init(void *cpu_data)
1846 {
1847         void *pal_vaddr;
1848         void *data;
1849         long sz = sizeof(struct ia64_mca_cpu);
1850         int cpu = smp_processor_id();
1851         static int first_time = 1;
1852 
1853         /*
1854          * Structure will already be allocated if cpu has been online,
1855          * then offlined.
1856          */
1857         if (__per_cpu_mca[cpu]) {
1858                 data = __va(__per_cpu_mca[cpu]);
1859         } else {
1860                 if (first_time) {
1861                         data = mca_bootmem();
1862                         first_time = 0;
1863                 } else
1864                         data = (void *)__get_free_pages(GFP_KERNEL,
1865                                                         get_order(sz));
1866                 if (!data)
1867                         panic("Could not allocate MCA memory for cpu %d\n",
1868                                         cpu);
1869         }
1870         format_mca_init_stack(data, offsetof(struct ia64_mca_cpu, mca_stack),
1871                 "MCA", cpu);
1872         format_mca_init_stack(data, offsetof(struct ia64_mca_cpu, init_stack),
1873                 "INIT", cpu);
1874         __get_cpu_var(ia64_mca_data) = __per_cpu_mca[cpu] = __pa(data);
1875 
1876         /*
1877          * Stash away a copy of the PTE needed to map the per-CPU page.
1878          * We may need it during MCA recovery.
1879          */
1880         __get_cpu_var(ia64_mca_per_cpu_pte) =
1881                 pte_val(mk_pte_phys(__pa(cpu_data), PAGE_KERNEL));
1882 
1883         /*
1884          * Also, stash away a copy of the PAL address and the PTE
1885          * needed to map it.
1886          */
1887         pal_vaddr = efi_get_pal_addr();
1888         if (!pal_vaddr)
1889                 return;
1890         __get_cpu_var(ia64_mca_pal_base) =
1891                 GRANULEROUNDDOWN((unsigned long) pal_vaddr);
1892         __get_cpu_var(ia64_mca_pal_pte) = pte_val(mk_pte_phys(__pa(pal_vaddr),
1893                                                               PAGE_KERNEL));
1894 }
1895 
1896 static void __cpuinit ia64_mca_cmc_vector_adjust(void *dummy)
1897 {
1898         unsigned long flags;
1899 
1900         local_irq_save(flags);
1901         if (!cmc_polling_enabled)
1902                 ia64_mca_cmc_vector_enable(NULL);
1903         local_irq_restore(flags);
1904 }
1905 
1906 static int __cpuinit mca_cpu_callback(struct notifier_block *nfb,
1907                                       unsigned long action,
1908                                       void *hcpu)
1909 {
1910         int hotcpu = (unsigned long) hcpu;
1911 
1912         switch (action) {
1913         case CPU_ONLINE:
1914         case CPU_ONLINE_FROZEN:
1915                 smp_call_function_single(hotcpu, ia64_mca_cmc_vector_adjust,
1916                                          NULL, 0);
1917                 break;
1918         }
1919         return NOTIFY_OK;
1920 }
1921 
1922 static struct notifier_block mca_cpu_notifier __cpuinitdata = {
1923         .notifier_call = mca_cpu_callback
1924 };
1925 
1926 /*
1927  * ia64_mca_init
1928  *
1929  *  Do all the system level mca specific initialization.
1930  *
1931  *      1. Register spinloop and wakeup request interrupt vectors
1932  *
1933  *      2. Register OS_MCA handler entry point
1934  *
1935  *      3. Register OS_INIT handler entry point
1936  *
1937  *  4. Initialize MCA/CMC/INIT related log buffers maintained by the OS.
1938  *
1939  *  Note that this initialization is done very early before some kernel
1940  *  services are available.
1941  *
1942  *  Inputs  :   None
1943  *
1944  *  Outputs :   None
1945  */
1946 void __init
1947 ia64_mca_init(void)
1948 {
1949         ia64_fptr_t *init_hldlr_ptr_monarch = (ia64_fptr_t *)ia64_os_init_dispatch_monarch;
1950         ia64_fptr_t *init_hldlr_ptr_slave = (ia64_fptr_t *)ia64_os_init_dispatch_slave;
1951         ia64_fptr_t *mca_hldlr_ptr = (ia64_fptr_t *)ia64_os_mca_dispatch;
1952         int i;
1953         long rc;
1954         struct ia64_sal_retval isrv;
1955         unsigned long timeout = IA64_MCA_RENDEZ_TIMEOUT; /* platform specific */
1956         static struct notifier_block default_init_monarch_nb = {
1957                 .notifier_call = default_monarch_init_process,
1958                 .priority = 0/* we need to notified last */
1959         };
1960 
1961         IA64_MCA_DEBUG("%s: begin\n", __func__);
1962 
1963         /* Clear the Rendez checkin flag for all cpus */
1964         for(i = 0 ; i < NR_CPUS; i++)
1965                 ia64_mc_info.imi_rendez_checkin[i] = IA64_MCA_RENDEZ_CHECKIN_NOTDONE;
1966 
1967         /*
1968          * Register the rendezvous spinloop and wakeup mechanism with SAL
1969          */
1970 
1971         /* Register the rendezvous interrupt vector with SAL */
1972         while (1) {
1973                 isrv = ia64_sal_mc_set_params(SAL_MC_PARAM_RENDEZ_INT,
1974                                               SAL_MC_PARAM_MECHANISM_INT,
1975                                               IA64_MCA_RENDEZ_VECTOR,
1976                                               timeout,
1977                                               SAL_MC_PARAM_RZ_ALWAYS);
1978                 rc = isrv.status;
1979                 if (rc == 0)
1980                         break;
1981                 if (rc == -2) {
1982                         printk(KERN_INFO "Increasing MCA rendezvous timeout from "
1983                                 "%ld to %ld milliseconds\n", timeout, isrv.v0);
1984                         timeout = isrv.v0;
1985                         NOTIFY_MCA(DIE_MCA_NEW_TIMEOUT, NULL, timeout, 0);
1986                         continue;
1987                 }
1988                 printk(KERN_ERR "Failed to register rendezvous interrupt "
1989                        "with SAL (status %ld)\n", rc);
1990                 return;
1991         }
1992 
1993         /* Register the wakeup interrupt vector with SAL */
1994         isrv = ia64_sal_mc_set_params(SAL_MC_PARAM_RENDEZ_WAKEUP,
1995                                       SAL_MC_PARAM_MECHANISM_INT,
1996                                       IA64_MCA_WAKEUP_VECTOR,
1997                                       0, 0);
1998         rc = isrv.status;
1999         if (rc) {
2000                 printk(KERN_ERR "Failed to register wakeup interrupt with SAL "
2001                        "(status %ld)\n", rc);
2002                 return;
2003         }
2004 
2005         IA64_MCA_DEBUG("%s: registered MCA rendezvous spinloop and wakeup mech.\n", __func__);
2006 
2007         ia64_mc_info.imi_mca_handler        = ia64_tpa(mca_hldlr_ptr->fp);
2008         /*
2009          * XXX - disable SAL checksum by setting size to 0; should be
2010          *      ia64_tpa(ia64_os_mca_dispatch_end) - ia64_tpa(ia64_os_mca_dispatch);
2011          */
2012         ia64_mc_info.imi_mca_handler_size       = 0;
2013 
2014         /* Register the os mca handler with SAL */
2015         if ((rc = ia64_sal_set_vectors(SAL_VECTOR_OS_MCA,
2016                                        ia64_mc_info.imi_mca_handler,
2017                                        ia64_tpa(mca_hldlr_ptr->gp),
2018                                        ia64_mc_info.imi_mca_handler_size,
2019                                        0, 0, 0)))
2020         {
2021                 printk(KERN_ERR "Failed to register OS MCA handler with SAL "
2022                        "(status %ld)\n", rc);
2023                 return;
2024         }
2025 
2026         IA64_MCA_DEBUG("%s: registered OS MCA handler with SAL at 0x%lx, gp = 0x%lx\n", __func__,
2027                        ia64_mc_info.imi_mca_handler, ia64_tpa(mca_hldlr_ptr->gp));
2028 
2029         /*
2030          * XXX - disable SAL checksum by setting size to 0, should be
2031          * size of the actual init handler in mca_asm.S.
2032          */
2033         ia64_mc_info.imi_monarch_init_handler           = ia64_tpa(init_hldlr_ptr_monarch->fp);
2034         ia64_mc_info.imi_monarch_init_handler_size      = 0;
2035         ia64_mc_info.imi_slave_init_handler             = ia64_tpa(init_hldlr_ptr_slave->fp);
2036         ia64_mc_info.imi_slave_init_handler_size        = 0;
2037 
2038         IA64_MCA_DEBUG("%s: OS INIT handler at %lx\n", __func__,
2039                        ia64_mc_info.imi_monarch_init_handler);
2040 
2041         /* Register the os init handler with SAL */
2042         if ((rc = ia64_sal_set_vectors(SAL_VECTOR_OS_INIT,
2043                                        ia64_mc_info.imi_monarch_init_handler,
2044                                        ia64_tpa(ia64_getreg(_IA64_REG_GP)),
2045                                        ia64_mc_info.imi_monarch_init_handler_size,
2046                                        ia64_mc_info.imi_slave_init_handler,
2047                                        ia64_tpa(ia64_getreg(_IA64_REG_GP)),
2048                                        ia64_mc_info.imi_slave_init_handler_size)))
2049         {
2050                 printk(KERN_ERR "Failed to register m/s INIT handlers with SAL "
2051                        "(status %ld)\n", rc);
2052                 return;
2053         }
2054         if (register_die_notifier(&default_init_monarch_nb)) {
2055                 printk(KERN_ERR "Failed to register default monarch INIT process\n");
2056                 return;
2057         }
2058 
2059         IA64_MCA_DEBUG("%s: registered OS INIT handler with SAL\n", __func__);
2060 
2061         /* Initialize the areas set aside by the OS to buffer the
2062          * platform/processor error states for MCA/INIT/CMC
2063          * handling.
2064          */
2065         ia64_log_init(SAL_INFO_TYPE_MCA);
2066         ia64_log_init(SAL_INFO_TYPE_INIT);
2067         ia64_log_init(SAL_INFO_TYPE_CMC);
2068         ia64_log_init(SAL_INFO_TYPE_CPE);
2069 
2070         mca_init = 1;
2071         printk(KERN_INFO "MCA related initialization done\n");
2072 }
2073 
2074 /*
2075  * ia64_mca_late_init
2076  *
2077  *      Opportunity to setup things that require initialization later
2078  *      than ia64_mca_init.  Setup a timer to poll for CPEs if the
2079  *      platform doesn't support an interrupt driven mechanism.
2080  *
2081  *  Inputs  :   None
2082  *  Outputs :   Status
2083  */
2084 static int __init
2085 ia64_mca_late_init(void)
2086 {
2087         if (!mca_init)
2088                 return 0;
2089 
2090         /*
2091          *  Configure the CMCI/P vector and handler. Interrupts for CMC are
2092          *  per-processor, so AP CMC interrupts are setup in smp_callin() (smpboot.c).
2093          */
2094         register_percpu_irq(IA64_CMC_VECTOR, &cmci_irqaction);
2095         register_percpu_irq(IA64_CMCP_VECTOR, &cmcp_irqaction);
2096         ia64_mca_cmc_vector_setup();       /* Setup vector on BSP */
2097 
2098         /* Setup the MCA rendezvous interrupt vector */
2099         register_percpu_irq(IA64_MCA_RENDEZ_VECTOR, &mca_rdzv_irqaction);
2100 
2101         /* Setup the MCA wakeup interrupt vector */
2102         register_percpu_irq(IA64_MCA_WAKEUP_VECTOR, &mca_wkup_irqaction);
2103 
2104 #ifdef CONFIG_ACPI
2105         /* Setup the CPEI/P handler */
2106         register_percpu_irq(IA64_CPEP_VECTOR, &mca_cpep_irqaction);
2107 #endif
2108 
2109         register_hotcpu_notifier(&mca_cpu_notifier);
2110 
2111         /* Setup the CMCI/P vector and handler */
2112         init_timer(&cmc_poll_timer);
2113         cmc_poll_timer.function = ia64_mca_cmc_poll;
2114 
2115         /* Unmask/enable the vector */
2116         cmc_polling_enabled = 0;
2117         schedule_work(&cmc_enable_work);
2118 
2119         IA64_MCA_DEBUG("%s: CMCI/P setup and enabled.\n", __func__);
2120 
2121 #ifdef CONFIG_ACPI
2122         /* Setup the CPEI/P vector and handler */
2123         cpe_vector = acpi_request_vector(ACPI_INTERRUPT_CPEI);
2124         init_timer(&cpe_poll_timer);
2125         cpe_poll_timer.function = ia64_mca_cpe_poll;
2126 
2127         {
2128                 unsigned int irq;
2129 
2130                 if (cpe_vector >= 0) {
2131                         /* If platform supports CPEI, enable the irq. */
2132                         irq = local_vector_to_irq(cpe_vector);
2133                         if (irq > 0) {
2134                                 cpe_poll_enabled = 0;
2135                                 irq_set_status_flags(irq, IRQ_PER_CPU);
2136                                 setup_irq(irq, &mca_cpe_irqaction);
2137                                 ia64_cpe_irq = irq;
2138                                 ia64_mca_register_cpev(cpe_vector);
2139                                 IA64_MCA_DEBUG("%s: CPEI/P setup and enabled.\n",
2140                                         __func__);
2141                                 return 0;
2142                         }
2143                         printk(KERN_ERR "%s: Failed to find irq for CPE "
2144                                         "interrupt handler, vector %d\n",
2145                                         __func__, cpe_vector);
2146                 }
2147                 /* If platform doesn't support CPEI, get the timer going. */
2148                 if (cpe_poll_enabled) {
2149                         ia64_mca_cpe_poll(0UL);
2150                         IA64_MCA_DEBUG("%s: CPEP setup and enabled.\n", __func__);
2151                 }
2152         }
2153 #endif
2154 
2155         return 0;
2156 }
2157 
2158 device_initcall(ia64_mca_late_init);
2159 

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