3 * Purpose: Generic MCA handling layer
5 * Copyright (C) 2003 Hewlett-Packard Co
6 * David Mosberger-Tang <davidm@hpl.hp.com>
8 * Copyright (C) 2002 Dell Inc.
9 * Copyright (C) Matt Domsch <Matt_Domsch@dell.com>
11 * Copyright (C) 2002 Intel
12 * Copyright (C) Jenna Hall <jenna.s.hall@intel.com>
14 * Copyright (C) 2001 Intel
15 * Copyright (C) Fred Lewis <frederick.v.lewis@intel.com>
17 * Copyright (C) 2000 Intel
18 * Copyright (C) Chuck Fleckenstein <cfleck@co.intel.com>
20 * Copyright (C) 1999, 2004-2008 Silicon Graphics, Inc.
21 * Copyright (C) Vijay Chander <vijay@engr.sgi.com>
23 * Copyright (C) 2006 FUJITSU LIMITED
24 * Copyright (C) Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
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.
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.
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().
41 * 2002-03-25 Matt Domsch <Matt_Domsch@dell.com>
44 * 2003-04-15 David Mosberger-Tang <davidm@hpl.hp.com>
45 * Added INIT backtrace support.
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().
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.
59 * 2005-08-12 Keith Owens <kaos@sgi.com>
60 * Convert MCA/INIT handlers to use per event stacks and SAL/OS
63 * 2005-10-07 Keith Owens <kaos@sgi.com>
64 * Add notify_die() hooks.
66 * 2006-09-15 Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
67 * Add printing support for MCA/INIT.
69 * 2007-04-27 Russ Anderson <rja@sgi.com>
70 * Support multiple cpus going through OS_MCA in the same event.
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>
89 #include <asm/delay.h>
90 #include <asm/machvec.h>
91 #include <asm/meminit.h>
93 #include <asm/ptrace.h>
94 #include <asm/system.h>
97 #include <asm/kexec.h>
100 #include <asm/hw_irq.h>
105 #if defined(IA64_MCA_DEBUG_INFO)
106 # define IA64_MCA_DEBUG(fmt...) printk(fmt)
108 # define IA64_MCA_DEBUG(fmt...)
111 /* Used by mca_asm.S */
112 DEFINE_PER_CPU(u64
, ia64_mca_data
); /* == __per_cpu_mca[smp_processor_id()] */
113 DEFINE_PER_CPU(u64
, ia64_mca_per_cpu_pte
); /* PTE to map per-CPU area */
114 DEFINE_PER_CPU(u64
, ia64_mca_pal_pte
); /* PTE to map PAL code */
115 DEFINE_PER_CPU(u64
, ia64_mca_pal_base
); /* vaddr PAL code granule */
117 unsigned long __per_cpu_mca
[NR_CPUS
];
120 extern void ia64_os_init_dispatch_monarch (void);
121 extern void ia64_os_init_dispatch_slave (void);
123 static int monarch_cpu
= -1;
125 static ia64_mc_info_t ia64_mc_info
;
127 #define MAX_CPE_POLL_INTERVAL (15*60*HZ) /* 15 minutes */
128 #define MIN_CPE_POLL_INTERVAL (2*60*HZ) /* 2 minutes */
129 #define CMC_POLL_INTERVAL (1*60*HZ) /* 1 minute */
130 #define CPE_HISTORY_LENGTH 5
131 #define CMC_HISTORY_LENGTH 5
134 static struct timer_list cpe_poll_timer
;
136 static struct timer_list cmc_poll_timer
;
138 * This variable tells whether we are currently in polling mode.
139 * Start with this in the wrong state so we won't play w/ timers
140 * before the system is ready.
142 static int cmc_polling_enabled
= 1;
145 * Clearing this variable prevents CPE polling from getting activated
146 * in mca_late_init. Use it if your system doesn't provide a CPEI,
147 * but encounters problems retrieving CPE logs. This should only be
148 * necessary for debugging.
150 static int cpe_poll_enabled
= 1;
152 extern void salinfo_log_wakeup(int type
, u8
*buffer
, u64 size
, int irqsafe
);
154 static int mca_init __initdata
;
157 * limited & delayed printing support for MCA/INIT handler
160 #define mprintk(fmt...) ia64_mca_printk(fmt)
162 #define MLOGBUF_SIZE (512+256*NR_CPUS)
163 #define MLOGBUF_MSGMAX 256
164 static char mlogbuf
[MLOGBUF_SIZE
];
165 static DEFINE_SPINLOCK(mlogbuf_wlock
); /* mca context only */
166 static DEFINE_SPINLOCK(mlogbuf_rlock
); /* normal context only */
167 static unsigned long mlogbuf_start
;
168 static unsigned long mlogbuf_end
;
169 static unsigned int mlogbuf_finished
= 0;
170 static unsigned long mlogbuf_timestamp
= 0;
172 static int loglevel_save
= -1;
173 #define BREAK_LOGLEVEL(__console_loglevel) \
174 oops_in_progress = 1; \
175 if (loglevel_save < 0) \
176 loglevel_save = __console_loglevel; \
177 __console_loglevel = 15;
179 #define RESTORE_LOGLEVEL(__console_loglevel) \
180 if (loglevel_save >= 0) { \
181 __console_loglevel = loglevel_save; \
182 loglevel_save = -1; \
184 mlogbuf_finished = 0; \
185 oops_in_progress = 0;
188 * Push messages into buffer, print them later if not urgent.
190 void ia64_mca_printk(const char *fmt
, ...)
194 char temp_buf
[MLOGBUF_MSGMAX
];
198 printed_len
= vscnprintf(temp_buf
, sizeof(temp_buf
), fmt
, args
);
201 /* Copy the output into mlogbuf */
202 if (oops_in_progress
) {
203 /* mlogbuf was abandoned, use printk directly instead. */
206 spin_lock(&mlogbuf_wlock
);
207 for (p
= temp_buf
; *p
; p
++) {
208 unsigned long next
= (mlogbuf_end
+ 1) % MLOGBUF_SIZE
;
209 if (next
!= mlogbuf_start
) {
210 mlogbuf
[mlogbuf_end
] = *p
;
217 mlogbuf
[mlogbuf_end
] = '\0';
218 spin_unlock(&mlogbuf_wlock
);
221 EXPORT_SYMBOL(ia64_mca_printk
);
224 * Print buffered messages.
225 * NOTE: call this after returning normal context. (ex. from salinfod)
227 void ia64_mlogbuf_dump(void)
229 char temp_buf
[MLOGBUF_MSGMAX
];
233 unsigned int printed_len
;
235 /* Get output from mlogbuf */
236 while (mlogbuf_start
!= mlogbuf_end
) {
241 spin_lock_irqsave(&mlogbuf_rlock
, flags
);
243 index
= mlogbuf_start
;
244 while (index
!= mlogbuf_end
) {
246 index
= (index
+ 1) % MLOGBUF_SIZE
;
250 if (++printed_len
>= MLOGBUF_MSGMAX
- 1)
256 mlogbuf_start
= index
;
258 mlogbuf_timestamp
= 0;
259 spin_unlock_irqrestore(&mlogbuf_rlock
, flags
);
262 EXPORT_SYMBOL(ia64_mlogbuf_dump
);
265 * Call this if system is going to down or if immediate flushing messages to
266 * console is required. (ex. recovery was failed, crash dump is going to be
267 * invoked, long-wait rendezvous etc.)
268 * NOTE: this should be called from monarch.
270 static void ia64_mlogbuf_finish(int wait
)
272 BREAK_LOGLEVEL(console_loglevel
);
274 spin_lock_init(&mlogbuf_rlock
);
276 printk(KERN_EMERG
"mlogbuf_finish: printing switched to urgent mode, "
277 "MCA/INIT might be dodgy or fail.\n");
282 /* wait for console */
283 printk("Delaying for 5 seconds...\n");
286 mlogbuf_finished
= 1;
290 * Print buffered messages from INIT context.
292 static void ia64_mlogbuf_dump_from_init(void)
294 if (mlogbuf_finished
)
297 if (mlogbuf_timestamp
&&
298 time_before(jiffies
, mlogbuf_timestamp
+ 30 * HZ
)) {
299 printk(KERN_ERR
"INIT: mlogbuf_dump is interrupted by INIT "
300 " and the system seems to be messed up.\n");
301 ia64_mlogbuf_finish(0);
305 if (!spin_trylock(&mlogbuf_rlock
)) {
306 printk(KERN_ERR
"INIT: mlogbuf_dump is interrupted by INIT. "
307 "Generated messages other than stack dump will be "
308 "buffered to mlogbuf and will be printed later.\n");
309 printk(KERN_ERR
"INIT: If messages would not printed after "
310 "this INIT, wait 30sec and assert INIT again.\n");
311 if (!mlogbuf_timestamp
)
312 mlogbuf_timestamp
= jiffies
;
315 spin_unlock(&mlogbuf_rlock
);
320 ia64_mca_spin(const char *func
)
322 if (monarch_cpu
== smp_processor_id())
323 ia64_mlogbuf_finish(0);
324 mprintk(KERN_EMERG
"%s: spinning here, not returning to SAL\n", func
);
329 * IA64_MCA log support
331 #define IA64_MAX_LOGS 2 /* Double-buffering for nested MCAs */
332 #define IA64_MAX_LOG_TYPES 4 /* MCA, INIT, CMC, CPE */
334 typedef struct ia64_state_log_s
338 unsigned long isl_count
;
339 ia64_err_rec_t
*isl_log
[IA64_MAX_LOGS
]; /* need space to store header + error log */
342 static ia64_state_log_t ia64_state_log
[IA64_MAX_LOG_TYPES
];
344 #define IA64_LOG_ALLOCATE(it, size) \
345 {ia64_state_log[it].isl_log[IA64_LOG_CURR_INDEX(it)] = \
346 (ia64_err_rec_t *)alloc_bootmem(size); \
347 ia64_state_log[it].isl_log[IA64_LOG_NEXT_INDEX(it)] = \
348 (ia64_err_rec_t *)alloc_bootmem(size);}
349 #define IA64_LOG_LOCK_INIT(it) spin_lock_init(&ia64_state_log[it].isl_lock)
350 #define IA64_LOG_LOCK(it) spin_lock_irqsave(&ia64_state_log[it].isl_lock, s)
351 #define IA64_LOG_UNLOCK(it) spin_unlock_irqrestore(&ia64_state_log[it].isl_lock,s)
352 #define IA64_LOG_NEXT_INDEX(it) ia64_state_log[it].isl_index
353 #define IA64_LOG_CURR_INDEX(it) 1 - ia64_state_log[it].isl_index
354 #define IA64_LOG_INDEX_INC(it) \
355 {ia64_state_log[it].isl_index = 1 - ia64_state_log[it].isl_index; \
356 ia64_state_log[it].isl_count++;}
357 #define IA64_LOG_INDEX_DEC(it) \
358 ia64_state_log[it].isl_index = 1 - ia64_state_log[it].isl_index
359 #define IA64_LOG_NEXT_BUFFER(it) (void *)((ia64_state_log[it].isl_log[IA64_LOG_NEXT_INDEX(it)]))
360 #define IA64_LOG_CURR_BUFFER(it) (void *)((ia64_state_log[it].isl_log[IA64_LOG_CURR_INDEX(it)]))
361 #define IA64_LOG_COUNT(it) ia64_state_log[it].isl_count
365 * Reset the OS ia64 log buffer
366 * Inputs : info_type (SAL_INFO_TYPE_{MCA,INIT,CMC,CPE})
370 ia64_log_init(int sal_info_type
)
374 IA64_LOG_NEXT_INDEX(sal_info_type
) = 0;
375 IA64_LOG_LOCK_INIT(sal_info_type
);
377 // SAL will tell us the maximum size of any error record of this type
378 max_size
= ia64_sal_get_state_info_size(sal_info_type
);
380 /* alloc_bootmem() doesn't like zero-sized allocations! */
383 // set up OS data structures to hold error info
384 IA64_LOG_ALLOCATE(sal_info_type
, max_size
);
385 memset(IA64_LOG_CURR_BUFFER(sal_info_type
), 0, max_size
);
386 memset(IA64_LOG_NEXT_BUFFER(sal_info_type
), 0, max_size
);
392 * Get the current MCA log from SAL and copy it into the OS log buffer.
394 * Inputs : info_type (SAL_INFO_TYPE_{MCA,INIT,CMC,CPE})
395 * irq_safe whether you can use printk at this point
396 * Outputs : size (total record length)
397 * *buffer (ptr to error record)
401 ia64_log_get(int sal_info_type
, u8
**buffer
, int irq_safe
)
403 sal_log_record_header_t
*log_buffer
;
407 IA64_LOG_LOCK(sal_info_type
);
409 /* Get the process state information */
410 log_buffer
= IA64_LOG_NEXT_BUFFER(sal_info_type
);
412 total_len
= ia64_sal_get_state_info(sal_info_type
, (u64
*)log_buffer
);
415 IA64_LOG_INDEX_INC(sal_info_type
);
416 IA64_LOG_UNLOCK(sal_info_type
);
418 IA64_MCA_DEBUG("%s: SAL error record type %d retrieved. Record length = %ld\n",
419 __func__
, sal_info_type
, total_len
);
421 *buffer
= (u8
*) log_buffer
;
424 IA64_LOG_UNLOCK(sal_info_type
);
430 * ia64_mca_log_sal_error_record
432 * This function retrieves a specified error record type from SAL
433 * and wakes up any processes waiting for error records.
435 * Inputs : sal_info_type (Type of error record MCA/CMC/CPE)
436 * FIXME: remove MCA and irq_safe.
439 ia64_mca_log_sal_error_record(int sal_info_type
)
442 sal_log_record_header_t
*rh
;
444 int irq_safe
= sal_info_type
!= SAL_INFO_TYPE_MCA
;
445 #ifdef IA64_MCA_DEBUG_INFO
446 static const char * const rec_name
[] = { "MCA", "INIT", "CMC", "CPE" };
449 size
= ia64_log_get(sal_info_type
, &buffer
, irq_safe
);
453 salinfo_log_wakeup(sal_info_type
, buffer
, size
, irq_safe
);
456 IA64_MCA_DEBUG("CPU %d: SAL log contains %s error record\n",
458 sal_info_type
< ARRAY_SIZE(rec_name
) ? rec_name
[sal_info_type
] : "UNKNOWN");
460 /* Clear logs from corrected errors in case there's no user-level logger */
461 rh
= (sal_log_record_header_t
*)buffer
;
462 if (rh
->severity
== sal_log_severity_corrected
)
463 ia64_sal_clear_state_info(sal_info_type
);
468 * See if the MCA surfaced in an instruction range
469 * that has been tagged as recoverable.
472 * first First address range to check
473 * last Last address range to check
474 * ip Instruction pointer, address we are looking for
477 * 1 on Success (in the table)/ 0 on Failure (not in the table)
480 search_mca_table (const struct mca_table_entry
*first
,
481 const struct mca_table_entry
*last
,
484 const struct mca_table_entry
*curr
;
485 u64 curr_start
, curr_end
;
488 while (curr
<= last
) {
489 curr_start
= (u64
) &curr
->start_addr
+ curr
->start_addr
;
490 curr_end
= (u64
) &curr
->end_addr
+ curr
->end_addr
;
492 if ((ip
>= curr_start
) && (ip
<= curr_end
)) {
500 /* Given an address, look for it in the mca tables. */
501 int mca_recover_range(unsigned long addr
)
503 extern struct mca_table_entry __start___mca_table
[];
504 extern struct mca_table_entry __stop___mca_table
[];
506 return search_mca_table(__start___mca_table
, __stop___mca_table
-1, addr
);
508 EXPORT_SYMBOL_GPL(mca_recover_range
);
513 int ia64_cpe_irq
= -1;
516 ia64_mca_cpe_int_handler (int cpe_irq
, void *arg
)
518 static unsigned long cpe_history
[CPE_HISTORY_LENGTH
];
520 static DEFINE_SPINLOCK(cpe_history_lock
);
522 IA64_MCA_DEBUG("%s: received interrupt vector = %#x on CPU %d\n",
523 __func__
, cpe_irq
, smp_processor_id());
525 /* SAL spec states this should run w/ interrupts enabled */
528 spin_lock(&cpe_history_lock
);
529 if (!cpe_poll_enabled
&& cpe_vector
>= 0) {
531 int i
, count
= 1; /* we know 1 happened now */
532 unsigned long now
= jiffies
;
534 for (i
= 0; i
< CPE_HISTORY_LENGTH
; i
++) {
535 if (now
- cpe_history
[i
] <= HZ
)
539 IA64_MCA_DEBUG(KERN_INFO
"CPE threshold %d/%d\n", count
, CPE_HISTORY_LENGTH
);
540 if (count
>= CPE_HISTORY_LENGTH
) {
542 cpe_poll_enabled
= 1;
543 spin_unlock(&cpe_history_lock
);
544 disable_irq_nosync(local_vector_to_irq(IA64_CPE_VECTOR
));
547 * Corrected errors will still be corrected, but
548 * make sure there's a log somewhere that indicates
549 * something is generating more than we can handle.
551 printk(KERN_WARNING
"WARNING: Switching to polling CPE handler; error records may be lost\n");
553 mod_timer(&cpe_poll_timer
, jiffies
+ MIN_CPE_POLL_INTERVAL
);
555 /* lock already released, get out now */
558 cpe_history
[index
++] = now
;
559 if (index
== CPE_HISTORY_LENGTH
)
563 spin_unlock(&cpe_history_lock
);
565 /* Get the CPE error record and log it */
566 ia64_mca_log_sal_error_record(SAL_INFO_TYPE_CPE
);
571 #endif /* CONFIG_ACPI */
575 * ia64_mca_register_cpev
577 * Register the corrected platform error vector with SAL.
580 * cpev Corrected Platform Error Vector number
586 ia64_mca_register_cpev (int cpev
)
588 /* Register the CPE interrupt vector with SAL */
589 struct ia64_sal_retval isrv
;
591 isrv
= ia64_sal_mc_set_params(SAL_MC_PARAM_CPE_INT
, SAL_MC_PARAM_MECHANISM_INT
, cpev
, 0, 0);
593 printk(KERN_ERR
"Failed to register Corrected Platform "
594 "Error interrupt vector with SAL (status %ld)\n", isrv
.status
);
598 IA64_MCA_DEBUG("%s: corrected platform error "
599 "vector %#x registered\n", __func__
, cpev
);
601 #endif /* CONFIG_ACPI */
604 * ia64_mca_cmc_vector_setup
606 * Setup the corrected machine check vector register in the processor.
607 * (The interrupt is masked on boot. ia64_mca_late_init unmask this.)
608 * This function is invoked on a per-processor basis.
617 ia64_mca_cmc_vector_setup (void)
621 cmcv
.cmcv_regval
= 0;
622 cmcv
.cmcv_mask
= 1; /* Mask/disable interrupt at first */
623 cmcv
.cmcv_vector
= IA64_CMC_VECTOR
;
624 ia64_setreg(_IA64_REG_CR_CMCV
, cmcv
.cmcv_regval
);
626 IA64_MCA_DEBUG("%s: CPU %d corrected machine check vector %#x registered.\n",
627 __func__
, smp_processor_id(), IA64_CMC_VECTOR
);
629 IA64_MCA_DEBUG("%s: CPU %d CMCV = %#016lx\n",
630 __func__
, smp_processor_id(), ia64_getreg(_IA64_REG_CR_CMCV
));
634 * ia64_mca_cmc_vector_disable
636 * Mask the corrected machine check vector register in the processor.
637 * This function is invoked on a per-processor basis.
646 ia64_mca_cmc_vector_disable (void *dummy
)
650 cmcv
.cmcv_regval
= ia64_getreg(_IA64_REG_CR_CMCV
);
652 cmcv
.cmcv_mask
= 1; /* Mask/disable interrupt */
653 ia64_setreg(_IA64_REG_CR_CMCV
, cmcv
.cmcv_regval
);
655 IA64_MCA_DEBUG("%s: CPU %d corrected machine check vector %#x disabled.\n",
656 __func__
, smp_processor_id(), cmcv
.cmcv_vector
);
660 * ia64_mca_cmc_vector_enable
662 * Unmask the corrected machine check vector register in the processor.
663 * This function is invoked on a per-processor basis.
672 ia64_mca_cmc_vector_enable (void *dummy
)
676 cmcv
.cmcv_regval
= ia64_getreg(_IA64_REG_CR_CMCV
);
678 cmcv
.cmcv_mask
= 0; /* Unmask/enable interrupt */
679 ia64_setreg(_IA64_REG_CR_CMCV
, cmcv
.cmcv_regval
);
681 IA64_MCA_DEBUG("%s: CPU %d corrected machine check vector %#x enabled.\n",
682 __func__
, smp_processor_id(), cmcv
.cmcv_vector
);
686 * ia64_mca_cmc_vector_disable_keventd
688 * Called via keventd (smp_call_function() is not safe in interrupt context) to
689 * disable the cmc interrupt vector.
692 ia64_mca_cmc_vector_disable_keventd(struct work_struct
*unused
)
694 on_each_cpu(ia64_mca_cmc_vector_disable
, NULL
, 1, 0);
698 * ia64_mca_cmc_vector_enable_keventd
700 * Called via keventd (smp_call_function() is not safe in interrupt context) to
701 * enable the cmc interrupt vector.
704 ia64_mca_cmc_vector_enable_keventd(struct work_struct
*unused
)
706 on_each_cpu(ia64_mca_cmc_vector_enable
, NULL
, 1, 0);
712 * Send an inter-cpu interrupt to wake-up a particular cpu.
718 ia64_mca_wakeup(int cpu
)
720 platform_send_ipi(cpu
, IA64_MCA_WAKEUP_VECTOR
, IA64_IPI_DM_INT
, 0);
724 * ia64_mca_wakeup_all
726 * Wakeup all the slave cpus which have rendez'ed previously.
732 ia64_mca_wakeup_all(void)
736 /* Clear the Rendez checkin flag for all cpus */
737 for_each_online_cpu(cpu
) {
738 if (ia64_mc_info
.imi_rendez_checkin
[cpu
] == IA64_MCA_RENDEZ_CHECKIN_DONE
)
739 ia64_mca_wakeup(cpu
);
745 * ia64_mca_rendez_interrupt_handler
747 * This is handler used to put slave processors into spinloop
748 * while the monarch processor does the mca handling and later
749 * wake each slave up once the monarch is done. The state
750 * IA64_MCA_RENDEZ_CHECKIN_DONE indicates the cpu is rendez'ed
751 * in SAL. The state IA64_MCA_RENDEZ_CHECKIN_NOTDONE indicates
752 * the cpu has come out of OS rendezvous.
758 ia64_mca_rendez_int_handler(int rendez_irq
, void *arg
)
761 int cpu
= smp_processor_id();
762 struct ia64_mca_notify_die nd
=
763 { .sos
= NULL
, .monarch_cpu
= &monarch_cpu
};
765 /* Mask all interrupts */
766 local_irq_save(flags
);
767 if (notify_die(DIE_MCA_RENDZVOUS_ENTER
, "MCA", get_irq_regs(),
768 (long)&nd
, 0, 0) == NOTIFY_STOP
)
769 ia64_mca_spin(__func__
);
771 ia64_mc_info
.imi_rendez_checkin
[cpu
] = IA64_MCA_RENDEZ_CHECKIN_DONE
;
772 /* Register with the SAL monarch that the slave has
775 ia64_sal_mc_rendez();
777 if (notify_die(DIE_MCA_RENDZVOUS_PROCESS
, "MCA", get_irq_regs(),
778 (long)&nd
, 0, 0) == NOTIFY_STOP
)
779 ia64_mca_spin(__func__
);
781 /* Wait for the monarch cpu to exit. */
782 while (monarch_cpu
!= -1)
783 cpu_relax(); /* spin until monarch leaves */
785 if (notify_die(DIE_MCA_RENDZVOUS_LEAVE
, "MCA", get_irq_regs(),
786 (long)&nd
, 0, 0) == NOTIFY_STOP
)
787 ia64_mca_spin(__func__
);
789 ia64_mc_info
.imi_rendez_checkin
[cpu
] = IA64_MCA_RENDEZ_CHECKIN_NOTDONE
;
790 /* Enable all interrupts */
791 local_irq_restore(flags
);
796 * ia64_mca_wakeup_int_handler
798 * The interrupt handler for processing the inter-cpu interrupt to the
799 * slave cpu which was spinning in the rendez loop.
800 * Since this spinning is done by turning off the interrupts and
801 * polling on the wakeup-interrupt bit in the IRR, there is
802 * nothing useful to be done in the handler.
804 * Inputs : wakeup_irq (Wakeup-interrupt bit)
805 * arg (Interrupt handler specific argument)
810 ia64_mca_wakeup_int_handler(int wakeup_irq
, void *arg
)
815 /* Function pointer for extra MCA recovery */
816 int (*ia64_mca_ucmc_extension
)
817 (void*,struct ia64_sal_os_state
*)
821 ia64_reg_MCA_extension(int (*fn
)(void *, struct ia64_sal_os_state
*))
823 if (ia64_mca_ucmc_extension
)
826 ia64_mca_ucmc_extension
= fn
;
831 ia64_unreg_MCA_extension(void)
833 if (ia64_mca_ucmc_extension
)
834 ia64_mca_ucmc_extension
= NULL
;
837 EXPORT_SYMBOL(ia64_reg_MCA_extension
);
838 EXPORT_SYMBOL(ia64_unreg_MCA_extension
);
842 copy_reg(const u64
*fr
, u64 fnat
, u64
*tr
, u64
*tnat
)
844 u64 fslot
, tslot
, nat
;
846 fslot
= ((unsigned long)fr
>> 3) & 63;
847 tslot
= ((unsigned long)tr
>> 3) & 63;
848 *tnat
&= ~(1UL << tslot
);
849 nat
= (fnat
>> fslot
) & 1;
850 *tnat
|= (nat
<< tslot
);
853 /* Change the comm field on the MCA/INT task to include the pid that
854 * was interrupted, it makes for easier debugging. If that pid was 0
855 * (swapper or nested MCA/INIT) then use the start of the previous comm
856 * field suffixed with its cpu.
860 ia64_mca_modify_comm(const struct task_struct
*previous_current
)
862 char *p
, comm
[sizeof(current
->comm
)];
863 if (previous_current
->pid
)
864 snprintf(comm
, sizeof(comm
), "%s %d",
865 current
->comm
, previous_current
->pid
);
868 if ((p
= strchr(previous_current
->comm
, ' ')))
869 l
= p
- previous_current
->comm
;
871 l
= strlen(previous_current
->comm
);
872 snprintf(comm
, sizeof(comm
), "%s %*s %d",
873 current
->comm
, l
, previous_current
->comm
,
874 task_thread_info(previous_current
)->cpu
);
876 memcpy(current
->comm
, comm
, sizeof(current
->comm
));
879 /* On entry to this routine, we are running on the per cpu stack, see
880 * mca_asm.h. The original stack has not been touched by this event. Some of
881 * the original stack's registers will be in the RBS on this stack. This stack
882 * also contains a partial pt_regs and switch_stack, the rest of the data is in
885 * The first thing to do is modify the original stack to look like a blocked
886 * task so we can run backtrace on the original task. Also mark the per cpu
887 * stack as current to ensure that we use the correct task state, it also means
888 * that we can do backtrace on the MCA/INIT handler code itself.
891 static struct task_struct
*
892 ia64_mca_modify_original_stack(struct pt_regs
*regs
,
893 const struct switch_stack
*sw
,
894 struct ia64_sal_os_state
*sos
,
899 extern char ia64_leave_kernel
[]; /* Need asm address, not function descriptor */
900 const pal_min_state_area_t
*ms
= sos
->pal_min_state
;
901 struct task_struct
*previous_current
;
902 struct pt_regs
*old_regs
;
903 struct switch_stack
*old_sw
;
904 unsigned size
= sizeof(struct pt_regs
) +
905 sizeof(struct switch_stack
) + 16;
906 u64
*old_bspstore
, *old_bsp
;
907 u64
*new_bspstore
, *new_bsp
;
908 u64 old_unat
, old_rnat
, new_rnat
, nat
;
909 u64 slots
, loadrs
= regs
->loadrs
;
910 u64 r12
= ms
->pmsa_gr
[12-1], r13
= ms
->pmsa_gr
[13-1];
911 u64 ar_bspstore
= regs
->ar_bspstore
;
912 u64 ar_bsp
= regs
->ar_bspstore
+ (loadrs
>> 16);
915 int cpu
= smp_processor_id();
917 previous_current
= curr_task(cpu
);
918 set_curr_task(cpu
, current
);
919 if ((p
= strchr(current
->comm
, ' ')))
922 /* Best effort attempt to cope with MCA/INIT delivered while in
925 regs
->cr_ipsr
= ms
->pmsa_ipsr
;
926 if (ia64_psr(regs
)->dt
== 0) {
938 if (ia64_psr(regs
)->rt
== 0) {
951 /* mca_asm.S ia64_old_stack() cannot assume that the dirty registers
952 * have been copied to the old stack, the old stack may fail the
953 * validation tests below. So ia64_old_stack() must restore the dirty
954 * registers from the new stack. The old and new bspstore probably
955 * have different alignments, so loadrs calculated on the old bsp
956 * cannot be used to restore from the new bsp. Calculate a suitable
957 * loadrs for the new stack and save it in the new pt_regs, where
958 * ia64_old_stack() can get it.
960 old_bspstore
= (u64
*)ar_bspstore
;
961 old_bsp
= (u64
*)ar_bsp
;
962 slots
= ia64_rse_num_regs(old_bspstore
, old_bsp
);
963 new_bspstore
= (u64
*)((u64
)current
+ IA64_RBS_OFFSET
);
964 new_bsp
= ia64_rse_skip_regs(new_bspstore
, slots
);
965 regs
->loadrs
= (new_bsp
- new_bspstore
) * 8 << 16;
967 /* Verify the previous stack state before we change it */
968 if (user_mode(regs
)) {
969 msg
= "occurred in user space";
970 /* previous_current is guaranteed to be valid when the task was
971 * in user space, so ...
973 ia64_mca_modify_comm(previous_current
);
977 if (r13
!= sos
->prev_IA64_KR_CURRENT
) {
978 msg
= "inconsistent previous current and r13";
982 if (!mca_recover_range(ms
->pmsa_iip
)) {
983 if ((r12
- r13
) >= KERNEL_STACK_SIZE
) {
984 msg
= "inconsistent r12 and r13";
987 if ((ar_bspstore
- r13
) >= KERNEL_STACK_SIZE
) {
988 msg
= "inconsistent ar.bspstore and r13";
993 msg
= "old_bspstore is in the wrong region";
996 if ((ar_bsp
- r13
) >= KERNEL_STACK_SIZE
) {
997 msg
= "inconsistent ar.bsp and r13";
1000 size
+= (ia64_rse_skip_regs(old_bspstore
, slots
) - old_bspstore
) * 8;
1001 if (ar_bspstore
+ size
> r12
) {
1002 msg
= "no room for blocked state";
1007 ia64_mca_modify_comm(previous_current
);
1009 /* Make the original task look blocked. First stack a struct pt_regs,
1010 * describing the state at the time of interrupt. mca_asm.S built a
1011 * partial pt_regs, copy it and fill in the blanks using minstate.
1013 p
= (char *)r12
- sizeof(*regs
);
1014 old_regs
= (struct pt_regs
*)p
;
1015 memcpy(old_regs
, regs
, sizeof(*regs
));
1016 /* If ipsr.ic then use pmsa_{iip,ipsr,ifs}, else use
1017 * pmsa_{xip,xpsr,xfs}
1019 if (ia64_psr(regs
)->ic
) {
1020 old_regs
->cr_iip
= ms
->pmsa_iip
;
1021 old_regs
->cr_ipsr
= ms
->pmsa_ipsr
;
1022 old_regs
->cr_ifs
= ms
->pmsa_ifs
;
1024 old_regs
->cr_iip
= ms
->pmsa_xip
;
1025 old_regs
->cr_ipsr
= ms
->pmsa_xpsr
;
1026 old_regs
->cr_ifs
= ms
->pmsa_xfs
;
1028 old_regs
->pr
= ms
->pmsa_pr
;
1029 old_regs
->b0
= ms
->pmsa_br0
;
1030 old_regs
->loadrs
= loadrs
;
1031 old_regs
->ar_rsc
= ms
->pmsa_rsc
;
1032 old_unat
= old_regs
->ar_unat
;
1033 copy_reg(&ms
->pmsa_gr
[1-1], ms
->pmsa_nat_bits
, &old_regs
->r1
, &old_unat
);
1034 copy_reg(&ms
->pmsa_gr
[2-1], ms
->pmsa_nat_bits
, &old_regs
->r2
, &old_unat
);
1035 copy_reg(&ms
->pmsa_gr
[3-1], ms
->pmsa_nat_bits
, &old_regs
->r3
, &old_unat
);
1036 copy_reg(&ms
->pmsa_gr
[8-1], ms
->pmsa_nat_bits
, &old_regs
->r8
, &old_unat
);
1037 copy_reg(&ms
->pmsa_gr
[9-1], ms
->pmsa_nat_bits
, &old_regs
->r9
, &old_unat
);
1038 copy_reg(&ms
->pmsa_gr
[10-1], ms
->pmsa_nat_bits
, &old_regs
->r10
, &old_unat
);
1039 copy_reg(&ms
->pmsa_gr
[11-1], ms
->pmsa_nat_bits
, &old_regs
->r11
, &old_unat
);
1040 copy_reg(&ms
->pmsa_gr
[12-1], ms
->pmsa_nat_bits
, &old_regs
->r12
, &old_unat
);
1041 copy_reg(&ms
->pmsa_gr
[13-1], ms
->pmsa_nat_bits
, &old_regs
->r13
, &old_unat
);
1042 copy_reg(&ms
->pmsa_gr
[14-1], ms
->pmsa_nat_bits
, &old_regs
->r14
, &old_unat
);
1043 copy_reg(&ms
->pmsa_gr
[15-1], ms
->pmsa_nat_bits
, &old_regs
->r15
, &old_unat
);
1044 if (ia64_psr(old_regs
)->bn
)
1045 bank
= ms
->pmsa_bank1_gr
;
1047 bank
= ms
->pmsa_bank0_gr
;
1048 copy_reg(&bank
[16-16], ms
->pmsa_nat_bits
, &old_regs
->r16
, &old_unat
);
1049 copy_reg(&bank
[17-16], ms
->pmsa_nat_bits
, &old_regs
->r17
, &old_unat
);
1050 copy_reg(&bank
[18-16], ms
->pmsa_nat_bits
, &old_regs
->r18
, &old_unat
);
1051 copy_reg(&bank
[19-16], ms
->pmsa_nat_bits
, &old_regs
->r19
, &old_unat
);
1052 copy_reg(&bank
[20-16], ms
->pmsa_nat_bits
, &old_regs
->r20
, &old_unat
);
1053 copy_reg(&bank
[21-16], ms
->pmsa_nat_bits
, &old_regs
->r21
, &old_unat
);
1054 copy_reg(&bank
[22-16], ms
->pmsa_nat_bits
, &old_regs
->r22
, &old_unat
);
1055 copy_reg(&bank
[23-16], ms
->pmsa_nat_bits
, &old_regs
->r23
, &old_unat
);
1056 copy_reg(&bank
[24-16], ms
->pmsa_nat_bits
, &old_regs
->r24
, &old_unat
);
1057 copy_reg(&bank
[25-16], ms
->pmsa_nat_bits
, &old_regs
->r25
, &old_unat
);
1058 copy_reg(&bank
[26-16], ms
->pmsa_nat_bits
, &old_regs
->r26
, &old_unat
);
1059 copy_reg(&bank
[27-16], ms
->pmsa_nat_bits
, &old_regs
->r27
, &old_unat
);
1060 copy_reg(&bank
[28-16], ms
->pmsa_nat_bits
, &old_regs
->r28
, &old_unat
);
1061 copy_reg(&bank
[29-16], ms
->pmsa_nat_bits
, &old_regs
->r29
, &old_unat
);
1062 copy_reg(&bank
[30-16], ms
->pmsa_nat_bits
, &old_regs
->r30
, &old_unat
);
1063 copy_reg(&bank
[31-16], ms
->pmsa_nat_bits
, &old_regs
->r31
, &old_unat
);
1065 /* Next stack a struct switch_stack. mca_asm.S built a partial
1066 * switch_stack, copy it and fill in the blanks using pt_regs and
1069 * In the synthesized switch_stack, b0 points to ia64_leave_kernel,
1070 * ar.pfs is set to 0.
1072 * unwind.c::unw_unwind() does special processing for interrupt frames.
1073 * It checks if the PRED_NON_SYSCALL predicate is set, if the predicate
1074 * is clear then unw_unwind() does _not_ adjust bsp over pt_regs. Not
1075 * that this is documented, of course. Set PRED_NON_SYSCALL in the
1076 * switch_stack on the original stack so it will unwind correctly when
1077 * unwind.c reads pt_regs.
1079 * thread.ksp is updated to point to the synthesized switch_stack.
1081 p
-= sizeof(struct switch_stack
);
1082 old_sw
= (struct switch_stack
*)p
;
1083 memcpy(old_sw
, sw
, sizeof(*sw
));
1084 old_sw
->caller_unat
= old_unat
;
1085 old_sw
->ar_fpsr
= old_regs
->ar_fpsr
;
1086 copy_reg(&ms
->pmsa_gr
[4-1], ms
->pmsa_nat_bits
, &old_sw
->r4
, &old_unat
);
1087 copy_reg(&ms
->pmsa_gr
[5-1], ms
->pmsa_nat_bits
, &old_sw
->r5
, &old_unat
);
1088 copy_reg(&ms
->pmsa_gr
[6-1], ms
->pmsa_nat_bits
, &old_sw
->r6
, &old_unat
);
1089 copy_reg(&ms
->pmsa_gr
[7-1], ms
->pmsa_nat_bits
, &old_sw
->r7
, &old_unat
);
1090 old_sw
->b0
= (u64
)ia64_leave_kernel
;
1091 old_sw
->b1
= ms
->pmsa_br1
;
1093 old_sw
->ar_unat
= old_unat
;
1094 old_sw
->pr
= old_regs
->pr
| (1UL << PRED_NON_SYSCALL
);
1095 previous_current
->thread
.ksp
= (u64
)p
- 16;
1097 /* Finally copy the original stack's registers back to its RBS.
1098 * Registers from ar.bspstore through ar.bsp at the time of the event
1099 * are in the current RBS, copy them back to the original stack. The
1100 * copy must be done register by register because the original bspstore
1101 * and the current one have different alignments, so the saved RNAT
1102 * data occurs at different places.
1104 * mca_asm does cover, so the old_bsp already includes all registers at
1105 * the time of MCA/INIT. It also does flushrs, so all registers before
1106 * this function have been written to backing store on the MCA/INIT
1109 new_rnat
= ia64_get_rnat(ia64_rse_rnat_addr(new_bspstore
));
1110 old_rnat
= regs
->ar_rnat
;
1112 if (ia64_rse_is_rnat_slot(new_bspstore
)) {
1113 new_rnat
= ia64_get_rnat(new_bspstore
++);
1115 if (ia64_rse_is_rnat_slot(old_bspstore
)) {
1116 *old_bspstore
++ = old_rnat
;
1119 nat
= (new_rnat
>> ia64_rse_slot_num(new_bspstore
)) & 1UL;
1120 old_rnat
&= ~(1UL << ia64_rse_slot_num(old_bspstore
));
1121 old_rnat
|= (nat
<< ia64_rse_slot_num(old_bspstore
));
1122 *old_bspstore
++ = *new_bspstore
++;
1124 old_sw
->ar_bspstore
= (unsigned long)old_bspstore
;
1125 old_sw
->ar_rnat
= old_rnat
;
1127 sos
->prev_task
= previous_current
;
1128 return previous_current
;
1131 printk(KERN_INFO
"cpu %d, %s %s, original stack not modified\n",
1132 smp_processor_id(), type
, msg
);
1133 return previous_current
;
1136 /* The monarch/slave interaction is based on monarch_cpu and requires that all
1137 * slaves have entered rendezvous before the monarch leaves. If any cpu has
1138 * not entered rendezvous yet then wait a bit. The assumption is that any
1139 * slave that has not rendezvoused after a reasonable time is never going to do
1140 * so. In this context, slave includes cpus that respond to the MCA rendezvous
1141 * interrupt, as well as cpus that receive the INIT slave event.
1145 ia64_wait_for_slaves(int monarch
, const char *type
)
1150 * wait 5 seconds total for slaves (arbitrary)
1152 for (i
= 0; i
< 5000; i
++) {
1154 for_each_online_cpu(c
) {
1157 if (ia64_mc_info
.imi_rendez_checkin
[c
]
1158 == IA64_MCA_RENDEZ_CHECKIN_NOTDONE
) {
1159 udelay(1000); /* short wait */
1169 * Maybe slave(s) dead. Print buffered messages immediately.
1171 ia64_mlogbuf_finish(0);
1172 mprintk(KERN_INFO
"OS %s slave did not rendezvous on cpu", type
);
1173 for_each_online_cpu(c
) {
1176 if (ia64_mc_info
.imi_rendez_checkin
[c
] == IA64_MCA_RENDEZ_CHECKIN_NOTDONE
)
1183 mprintk(KERN_INFO
"All OS %s slaves have reached rendezvous\n", type
);
1190 * This is uncorrectable machine check handler called from OS_MCA
1191 * dispatch code which is in turn called from SAL_CHECK().
1192 * This is the place where the core of OS MCA handling is done.
1193 * Right now the logs are extracted and displayed in a well-defined
1194 * format. This handler code is supposed to be run only on the
1195 * monarch processor. Once the monarch is done with MCA handling
1196 * further MCA logging is enabled by clearing logs.
1197 * Monarch also has the duty of sending wakeup-IPIs to pull the
1198 * slave processors out of rendezvous spinloop.
1200 * If multiple processors call into OS_MCA, the first will become
1201 * the monarch. Subsequent cpus will be recorded in the mca_cpu
1202 * bitmask. After the first monarch has processed its MCA, it
1203 * will wake up the next cpu in the mca_cpu bitmask and then go
1204 * into the rendezvous loop. When all processors have serviced
1205 * their MCA, the last monarch frees up the rest of the processors.
1208 ia64_mca_handler(struct pt_regs
*regs
, struct switch_stack
*sw
,
1209 struct ia64_sal_os_state
*sos
)
1211 int recover
, cpu
= smp_processor_id();
1212 struct task_struct
*previous_current
;
1213 struct ia64_mca_notify_die nd
=
1214 { .sos
= sos
, .monarch_cpu
= &monarch_cpu
};
1215 static atomic_t mca_count
;
1216 static cpumask_t mca_cpu
;
1218 if (atomic_add_return(1, &mca_count
) == 1) {
1222 cpu_set(cpu
, mca_cpu
);
1225 mprintk(KERN_INFO
"Entered OS MCA handler. PSP=%lx cpu=%d "
1226 "monarch=%ld\n", sos
->proc_state_param
, cpu
, sos
->monarch
);
1228 previous_current
= ia64_mca_modify_original_stack(regs
, sw
, sos
, "MCA");
1230 if (notify_die(DIE_MCA_MONARCH_ENTER
, "MCA", regs
, (long)&nd
, 0, 0)
1232 ia64_mca_spin(__func__
);
1234 ia64_mc_info
.imi_rendez_checkin
[cpu
] = IA64_MCA_RENDEZ_CHECKIN_CONCURRENT_MCA
;
1236 ia64_wait_for_slaves(cpu
, "MCA");
1238 /* Wakeup all the processors which are spinning in the
1239 * rendezvous loop. They will leave SAL, then spin in the OS
1240 * with interrupts disabled until this monarch cpu leaves the
1241 * MCA handler. That gets control back to the OS so we can
1242 * backtrace the other cpus, backtrace when spinning in SAL
1245 ia64_mca_wakeup_all();
1246 if (notify_die(DIE_MCA_MONARCH_PROCESS
, "MCA", regs
, (long)&nd
, 0, 0)
1248 ia64_mca_spin(__func__
);
1250 while (cpu_isset(cpu
, mca_cpu
))
1251 cpu_relax(); /* spin until monarch wakes us */
1254 /* Get the MCA error record and log it */
1255 ia64_mca_log_sal_error_record(SAL_INFO_TYPE_MCA
);
1257 /* MCA error recovery */
1258 recover
= (ia64_mca_ucmc_extension
1259 && ia64_mca_ucmc_extension(
1260 IA64_LOG_CURR_BUFFER(SAL_INFO_TYPE_MCA
),
1264 sal_log_record_header_t
*rh
= IA64_LOG_CURR_BUFFER(SAL_INFO_TYPE_MCA
);
1265 rh
->severity
= sal_log_severity_corrected
;
1266 ia64_sal_clear_state_info(SAL_INFO_TYPE_MCA
);
1267 sos
->os_status
= IA64_MCA_CORRECTED
;
1269 /* Dump buffered message to console */
1270 ia64_mlogbuf_finish(1);
1273 if (notify_die(DIE_MCA_MONARCH_LEAVE
, "MCA", regs
, (long)&nd
, 0, recover
)
1275 ia64_mca_spin(__func__
);
1277 if (atomic_dec_return(&mca_count
) > 0) {
1280 /* wake up the next monarch cpu,
1281 * and put this cpu in the rendez loop.
1283 for_each_online_cpu(i
) {
1284 if (cpu_isset(i
, mca_cpu
)) {
1286 cpu_clear(i
, mca_cpu
); /* wake next cpu */
1287 while (monarch_cpu
!= -1)
1288 cpu_relax(); /* spin until last cpu leaves */
1289 set_curr_task(cpu
, previous_current
);
1290 ia64_mc_info
.imi_rendez_checkin
[cpu
]
1291 = IA64_MCA_RENDEZ_CHECKIN_NOTDONE
;
1296 set_curr_task(cpu
, previous_current
);
1297 ia64_mc_info
.imi_rendez_checkin
[cpu
] = IA64_MCA_RENDEZ_CHECKIN_NOTDONE
;
1298 monarch_cpu
= -1; /* This frees the slaves and previous monarchs */
1301 static DECLARE_WORK(cmc_disable_work
, ia64_mca_cmc_vector_disable_keventd
);
1302 static DECLARE_WORK(cmc_enable_work
, ia64_mca_cmc_vector_enable_keventd
);
1305 * ia64_mca_cmc_int_handler
1307 * This is corrected machine check interrupt handler.
1308 * Right now the logs are extracted and displayed in a well-defined
1313 * client data arg ptr
1319 ia64_mca_cmc_int_handler(int cmc_irq
, void *arg
)
1321 static unsigned long cmc_history
[CMC_HISTORY_LENGTH
];
1323 static DEFINE_SPINLOCK(cmc_history_lock
);
1325 IA64_MCA_DEBUG("%s: received interrupt vector = %#x on CPU %d\n",
1326 __func__
, cmc_irq
, smp_processor_id());
1328 /* SAL spec states this should run w/ interrupts enabled */
1331 spin_lock(&cmc_history_lock
);
1332 if (!cmc_polling_enabled
) {
1333 int i
, count
= 1; /* we know 1 happened now */
1334 unsigned long now
= jiffies
;
1336 for (i
= 0; i
< CMC_HISTORY_LENGTH
; i
++) {
1337 if (now
- cmc_history
[i
] <= HZ
)
1341 IA64_MCA_DEBUG(KERN_INFO
"CMC threshold %d/%d\n", count
, CMC_HISTORY_LENGTH
);
1342 if (count
>= CMC_HISTORY_LENGTH
) {
1344 cmc_polling_enabled
= 1;
1345 spin_unlock(&cmc_history_lock
);
1346 /* If we're being hit with CMC interrupts, we won't
1347 * ever execute the schedule_work() below. Need to
1348 * disable CMC interrupts on this processor now.
1350 ia64_mca_cmc_vector_disable(NULL
);
1351 schedule_work(&cmc_disable_work
);
1354 * Corrected errors will still be corrected, but
1355 * make sure there's a log somewhere that indicates
1356 * something is generating more than we can handle.
1358 printk(KERN_WARNING
"WARNING: Switching to polling CMC handler; error records may be lost\n");
1360 mod_timer(&cmc_poll_timer
, jiffies
+ CMC_POLL_INTERVAL
);
1362 /* lock already released, get out now */
1365 cmc_history
[index
++] = now
;
1366 if (index
== CMC_HISTORY_LENGTH
)
1370 spin_unlock(&cmc_history_lock
);
1372 /* Get the CMC error record and log it */
1373 ia64_mca_log_sal_error_record(SAL_INFO_TYPE_CMC
);
1379 * ia64_mca_cmc_int_caller
1381 * Triggered by sw interrupt from CMC polling routine. Calls
1382 * real interrupt handler and either triggers a sw interrupt
1383 * on the next cpu or does cleanup at the end.
1387 * client data arg ptr
1392 ia64_mca_cmc_int_caller(int cmc_irq
, void *arg
)
1394 static int start_count
= -1;
1397 cpuid
= smp_processor_id();
1399 /* If first cpu, update count */
1400 if (start_count
== -1)
1401 start_count
= IA64_LOG_COUNT(SAL_INFO_TYPE_CMC
);
1403 ia64_mca_cmc_int_handler(cmc_irq
, arg
);
1405 for (++cpuid
; cpuid
< NR_CPUS
&& !cpu_online(cpuid
) ; cpuid
++);
1407 if (cpuid
< NR_CPUS
) {
1408 platform_send_ipi(cpuid
, IA64_CMCP_VECTOR
, IA64_IPI_DM_INT
, 0);
1410 /* If no log record, switch out of polling mode */
1411 if (start_count
== IA64_LOG_COUNT(SAL_INFO_TYPE_CMC
)) {
1413 printk(KERN_WARNING
"Returning to interrupt driven CMC handler\n");
1414 schedule_work(&cmc_enable_work
);
1415 cmc_polling_enabled
= 0;
1419 mod_timer(&cmc_poll_timer
, jiffies
+ CMC_POLL_INTERVAL
);
1431 * Poll for Corrected Machine Checks (CMCs)
1433 * Inputs : dummy(unused)
1438 ia64_mca_cmc_poll (unsigned long dummy
)
1440 /* Trigger a CMC interrupt cascade */
1441 platform_send_ipi(first_cpu(cpu_online_map
), IA64_CMCP_VECTOR
, IA64_IPI_DM_INT
, 0);
1445 * ia64_mca_cpe_int_caller
1447 * Triggered by sw interrupt from CPE polling routine. Calls
1448 * real interrupt handler and either triggers a sw interrupt
1449 * on the next cpu or does cleanup at the end.
1453 * client data arg ptr
1460 ia64_mca_cpe_int_caller(int cpe_irq
, void *arg
)
1462 static int start_count
= -1;
1463 static int poll_time
= MIN_CPE_POLL_INTERVAL
;
1466 cpuid
= smp_processor_id();
1468 /* If first cpu, update count */
1469 if (start_count
== -1)
1470 start_count
= IA64_LOG_COUNT(SAL_INFO_TYPE_CPE
);
1472 ia64_mca_cpe_int_handler(cpe_irq
, arg
);
1474 for (++cpuid
; cpuid
< NR_CPUS
&& !cpu_online(cpuid
) ; cpuid
++);
1476 if (cpuid
< NR_CPUS
) {
1477 platform_send_ipi(cpuid
, IA64_CPEP_VECTOR
, IA64_IPI_DM_INT
, 0);
1480 * If a log was recorded, increase our polling frequency,
1481 * otherwise, backoff or return to interrupt mode.
1483 if (start_count
!= IA64_LOG_COUNT(SAL_INFO_TYPE_CPE
)) {
1484 poll_time
= max(MIN_CPE_POLL_INTERVAL
, poll_time
/ 2);
1485 } else if (cpe_vector
< 0) {
1486 poll_time
= min(MAX_CPE_POLL_INTERVAL
, poll_time
* 2);
1488 poll_time
= MIN_CPE_POLL_INTERVAL
;
1490 printk(KERN_WARNING
"Returning to interrupt driven CPE handler\n");
1491 enable_irq(local_vector_to_irq(IA64_CPE_VECTOR
));
1492 cpe_poll_enabled
= 0;
1495 if (cpe_poll_enabled
)
1496 mod_timer(&cpe_poll_timer
, jiffies
+ poll_time
);
1506 * Poll for Corrected Platform Errors (CPEs), trigger interrupt
1507 * on first cpu, from there it will trickle through all the cpus.
1509 * Inputs : dummy(unused)
1514 ia64_mca_cpe_poll (unsigned long dummy
)
1516 /* Trigger a CPE interrupt cascade */
1517 platform_send_ipi(first_cpu(cpu_online_map
), IA64_CPEP_VECTOR
, IA64_IPI_DM_INT
, 0);
1520 #endif /* CONFIG_ACPI */
1523 default_monarch_init_process(struct notifier_block
*self
, unsigned long val
, void *data
)
1526 struct task_struct
*g
, *t
;
1527 if (val
!= DIE_INIT_MONARCH_PROCESS
)
1530 if (atomic_read(&kdump_in_progress
))
1535 * FIXME: mlogbuf will brim over with INIT stack dumps.
1536 * To enable show_stack from INIT, we use oops_in_progress which should
1537 * be used in real oops. This would cause something wrong after INIT.
1539 BREAK_LOGLEVEL(console_loglevel
);
1540 ia64_mlogbuf_dump_from_init();
1542 printk(KERN_ERR
"Processes interrupted by INIT -");
1543 for_each_online_cpu(c
) {
1544 struct ia64_sal_os_state
*s
;
1545 t
= __va(__per_cpu_mca
[c
] + IA64_MCA_CPU_INIT_STACK_OFFSET
);
1546 s
= (struct ia64_sal_os_state
*)((char *)t
+ MCA_SOS_OFFSET
);
1550 printk(" %d", g
->pid
);
1552 printk(" %d (cpu %d task 0x%p)", g
->pid
, task_cpu(g
), g
);
1556 if (read_trylock(&tasklist_lock
)) {
1557 do_each_thread (g
, t
) {
1558 printk("\nBacktrace of pid %d (%s)\n", t
->pid
, t
->comm
);
1559 show_stack(t
, NULL
);
1560 } while_each_thread (g
, t
);
1561 read_unlock(&tasklist_lock
);
1563 /* FIXME: This will not restore zapped printk locks. */
1564 RESTORE_LOGLEVEL(console_loglevel
);
1569 * C portion of the OS INIT handler
1571 * Called from ia64_os_init_dispatch
1573 * Inputs: pointer to pt_regs where processor info was saved. SAL/OS state for
1574 * this event. This code is used for both monarch and slave INIT events, see
1577 * All INIT events switch to the INIT stack and change the previous process to
1578 * blocked status. If one of the INIT events is the monarch then we are
1579 * probably processing the nmi button/command. Use the monarch cpu to dump all
1580 * the processes. The slave INIT events all spin until the monarch cpu
1581 * returns. We can also get INIT slave events for MCA, in which case the MCA
1582 * process is the monarch.
1586 ia64_init_handler(struct pt_regs
*regs
, struct switch_stack
*sw
,
1587 struct ia64_sal_os_state
*sos
)
1589 static atomic_t slaves
;
1590 static atomic_t monarchs
;
1591 struct task_struct
*previous_current
;
1592 int cpu
= smp_processor_id();
1593 struct ia64_mca_notify_die nd
=
1594 { .sos
= sos
, .monarch_cpu
= &monarch_cpu
};
1596 (void) notify_die(DIE_INIT_ENTER
, "INIT", regs
, (long)&nd
, 0, 0);
1598 mprintk(KERN_INFO
"Entered OS INIT handler. PSP=%lx cpu=%d monarch=%ld\n",
1599 sos
->proc_state_param
, cpu
, sos
->monarch
);
1600 salinfo_log_wakeup(SAL_INFO_TYPE_INIT
, NULL
, 0, 0);
1602 previous_current
= ia64_mca_modify_original_stack(regs
, sw
, sos
, "INIT");
1603 sos
->os_status
= IA64_INIT_RESUME
;
1605 /* FIXME: Workaround for broken proms that drive all INIT events as
1606 * slaves. The last slave that enters is promoted to be a monarch.
1607 * Remove this code in September 2006, that gives platforms a year to
1608 * fix their proms and get their customers updated.
1610 if (!sos
->monarch
&& atomic_add_return(1, &slaves
) == num_online_cpus()) {
1611 mprintk(KERN_WARNING
"%s: Promoting cpu %d to monarch.\n",
1613 atomic_dec(&slaves
);
1617 /* FIXME: Workaround for broken proms that drive all INIT events as
1618 * monarchs. Second and subsequent monarchs are demoted to slaves.
1619 * Remove this code in September 2006, that gives platforms a year to
1620 * fix their proms and get their customers updated.
1622 if (sos
->monarch
&& atomic_add_return(1, &monarchs
) > 1) {
1623 mprintk(KERN_WARNING
"%s: Demoting cpu %d to slave.\n",
1625 atomic_dec(&monarchs
);
1629 if (!sos
->monarch
) {
1630 ia64_mc_info
.imi_rendez_checkin
[cpu
] = IA64_MCA_RENDEZ_CHECKIN_INIT
;
1631 while (monarch_cpu
== -1)
1632 cpu_relax(); /* spin until monarch enters */
1633 if (notify_die(DIE_INIT_SLAVE_ENTER
, "INIT", regs
, (long)&nd
, 0, 0)
1635 ia64_mca_spin(__func__
);
1636 if (notify_die(DIE_INIT_SLAVE_PROCESS
, "INIT", regs
, (long)&nd
, 0, 0)
1638 ia64_mca_spin(__func__
);
1639 while (monarch_cpu
!= -1)
1640 cpu_relax(); /* spin until monarch leaves */
1641 if (notify_die(DIE_INIT_SLAVE_LEAVE
, "INIT", regs
, (long)&nd
, 0, 0)
1643 ia64_mca_spin(__func__
);
1644 mprintk("Slave on cpu %d returning to normal service.\n", cpu
);
1645 set_curr_task(cpu
, previous_current
);
1646 ia64_mc_info
.imi_rendez_checkin
[cpu
] = IA64_MCA_RENDEZ_CHECKIN_NOTDONE
;
1647 atomic_dec(&slaves
);
1652 if (notify_die(DIE_INIT_MONARCH_ENTER
, "INIT", regs
, (long)&nd
, 0, 0)
1654 ia64_mca_spin(__func__
);
1657 * Wait for a bit. On some machines (e.g., HP's zx2000 and zx6000, INIT can be
1658 * generated via the BMC's command-line interface, but since the console is on the
1659 * same serial line, the user will need some time to switch out of the BMC before
1662 mprintk("Delaying for 5 seconds...\n");
1664 ia64_wait_for_slaves(cpu
, "INIT");
1665 /* If nobody intercepts DIE_INIT_MONARCH_PROCESS then we drop through
1666 * to default_monarch_init_process() above and just print all the
1669 if (notify_die(DIE_INIT_MONARCH_PROCESS
, "INIT", regs
, (long)&nd
, 0, 0)
1671 ia64_mca_spin(__func__
);
1672 if (notify_die(DIE_INIT_MONARCH_LEAVE
, "INIT", regs
, (long)&nd
, 0, 0)
1674 ia64_mca_spin(__func__
);
1675 mprintk("\nINIT dump complete. Monarch on cpu %d returning to normal service.\n", cpu
);
1676 atomic_dec(&monarchs
);
1677 set_curr_task(cpu
, previous_current
);
1683 ia64_mca_disable_cpe_polling(char *str
)
1685 cpe_poll_enabled
= 0;
1689 __setup("disable_cpe_poll", ia64_mca_disable_cpe_polling
);
1691 static struct irqaction cmci_irqaction
= {
1692 .handler
= ia64_mca_cmc_int_handler
,
1693 .flags
= IRQF_DISABLED
,
1697 static struct irqaction cmcp_irqaction
= {
1698 .handler
= ia64_mca_cmc_int_caller
,
1699 .flags
= IRQF_DISABLED
,
1703 static struct irqaction mca_rdzv_irqaction
= {
1704 .handler
= ia64_mca_rendez_int_handler
,
1705 .flags
= IRQF_DISABLED
,
1709 static struct irqaction mca_wkup_irqaction
= {
1710 .handler
= ia64_mca_wakeup_int_handler
,
1711 .flags
= IRQF_DISABLED
,
1716 static struct irqaction mca_cpe_irqaction
= {
1717 .handler
= ia64_mca_cpe_int_handler
,
1718 .flags
= IRQF_DISABLED
,
1722 static struct irqaction mca_cpep_irqaction
= {
1723 .handler
= ia64_mca_cpe_int_caller
,
1724 .flags
= IRQF_DISABLED
,
1727 #endif /* CONFIG_ACPI */
1729 /* Minimal format of the MCA/INIT stacks. The pseudo processes that run on
1730 * these stacks can never sleep, they cannot return from the kernel to user
1731 * space, they do not appear in a normal ps listing. So there is no need to
1732 * format most of the fields.
1735 static void __cpuinit
1736 format_mca_init_stack(void *mca_data
, unsigned long offset
,
1737 const char *type
, int cpu
)
1739 struct task_struct
*p
= (struct task_struct
*)((char *)mca_data
+ offset
);
1740 struct thread_info
*ti
;
1741 memset(p
, 0, KERNEL_STACK_SIZE
);
1742 ti
= task_thread_info(p
);
1743 ti
->flags
= _TIF_MCA_INIT
;
1744 ti
->preempt_count
= 1;
1748 p
->state
= TASK_UNINTERRUPTIBLE
;
1749 cpu_set(cpu
, p
->cpus_allowed
);
1750 INIT_LIST_HEAD(&p
->tasks
);
1751 p
->parent
= p
->real_parent
= p
->group_leader
= p
;
1752 INIT_LIST_HEAD(&p
->children
);
1753 INIT_LIST_HEAD(&p
->sibling
);
1754 strncpy(p
->comm
, type
, sizeof(p
->comm
)-1);
1757 /* Caller prevents this from being called after init */
1758 static void * __init_refok
mca_bootmem(void)
1760 return __alloc_bootmem(sizeof(struct ia64_mca_cpu
),
1761 KERNEL_STACK_SIZE
, 0);
1764 /* Do per-CPU MCA-related initialization. */
1766 ia64_mca_cpu_init(void *cpu_data
)
1770 long sz
= sizeof(struct ia64_mca_cpu
);
1771 int cpu
= smp_processor_id();
1772 static int first_time
= 1;
1775 * Structure will already be allocated if cpu has been online,
1778 if (__per_cpu_mca
[cpu
]) {
1779 data
= __va(__per_cpu_mca
[cpu
]);
1782 data
= mca_bootmem();
1785 data
= page_address(alloc_pages_node(numa_node_id(),
1786 GFP_KERNEL
, get_order(sz
)));
1788 panic("Could not allocate MCA memory for cpu %d\n",
1791 format_mca_init_stack(data
, offsetof(struct ia64_mca_cpu
, mca_stack
),
1793 format_mca_init_stack(data
, offsetof(struct ia64_mca_cpu
, init_stack
),
1795 __get_cpu_var(ia64_mca_data
) = __per_cpu_mca
[cpu
] = __pa(data
);
1798 * Stash away a copy of the PTE needed to map the per-CPU page.
1799 * We may need it during MCA recovery.
1801 __get_cpu_var(ia64_mca_per_cpu_pte
) =
1802 pte_val(mk_pte_phys(__pa(cpu_data
), PAGE_KERNEL
));
1805 * Also, stash away a copy of the PAL address and the PTE
1808 pal_vaddr
= efi_get_pal_addr();
1811 __get_cpu_var(ia64_mca_pal_base
) =
1812 GRANULEROUNDDOWN((unsigned long) pal_vaddr
);
1813 __get_cpu_var(ia64_mca_pal_pte
) = pte_val(mk_pte_phys(__pa(pal_vaddr
),
1817 static void __cpuinit
ia64_mca_cmc_vector_adjust(void *dummy
)
1819 unsigned long flags
;
1821 local_irq_save(flags
);
1822 if (!cmc_polling_enabled
)
1823 ia64_mca_cmc_vector_enable(NULL
);
1824 local_irq_restore(flags
);
1827 static int __cpuinit
mca_cpu_callback(struct notifier_block
*nfb
,
1828 unsigned long action
,
1831 int hotcpu
= (unsigned long) hcpu
;
1835 case CPU_ONLINE_FROZEN
:
1836 smp_call_function_single(hotcpu
, ia64_mca_cmc_vector_adjust
,
1843 static struct notifier_block mca_cpu_notifier __cpuinitdata
= {
1844 .notifier_call
= mca_cpu_callback
1850 * Do all the system level mca specific initialization.
1852 * 1. Register spinloop and wakeup request interrupt vectors
1854 * 2. Register OS_MCA handler entry point
1856 * 3. Register OS_INIT handler entry point
1858 * 4. Initialize MCA/CMC/INIT related log buffers maintained by the OS.
1860 * Note that this initialization is done very early before some kernel
1861 * services are available.
1870 ia64_fptr_t
*init_hldlr_ptr_monarch
= (ia64_fptr_t
*)ia64_os_init_dispatch_monarch
;
1871 ia64_fptr_t
*init_hldlr_ptr_slave
= (ia64_fptr_t
*)ia64_os_init_dispatch_slave
;
1872 ia64_fptr_t
*mca_hldlr_ptr
= (ia64_fptr_t
*)ia64_os_mca_dispatch
;
1875 struct ia64_sal_retval isrv
;
1876 u64 timeout
= IA64_MCA_RENDEZ_TIMEOUT
; /* platform specific */
1877 static struct notifier_block default_init_monarch_nb
= {
1878 .notifier_call
= default_monarch_init_process
,
1879 .priority
= 0/* we need to notified last */
1882 IA64_MCA_DEBUG("%s: begin\n", __func__
);
1884 /* Clear the Rendez checkin flag for all cpus */
1885 for(i
= 0 ; i
< NR_CPUS
; i
++)
1886 ia64_mc_info
.imi_rendez_checkin
[i
] = IA64_MCA_RENDEZ_CHECKIN_NOTDONE
;
1889 * Register the rendezvous spinloop and wakeup mechanism with SAL
1892 /* Register the rendezvous interrupt vector with SAL */
1894 isrv
= ia64_sal_mc_set_params(SAL_MC_PARAM_RENDEZ_INT
,
1895 SAL_MC_PARAM_MECHANISM_INT
,
1896 IA64_MCA_RENDEZ_VECTOR
,
1898 SAL_MC_PARAM_RZ_ALWAYS
);
1903 printk(KERN_INFO
"Increasing MCA rendezvous timeout from "
1904 "%ld to %ld milliseconds\n", timeout
, isrv
.v0
);
1906 (void) notify_die(DIE_MCA_NEW_TIMEOUT
, "MCA", NULL
, timeout
, 0, 0);
1909 printk(KERN_ERR
"Failed to register rendezvous interrupt "
1910 "with SAL (status %ld)\n", rc
);
1914 /* Register the wakeup interrupt vector with SAL */
1915 isrv
= ia64_sal_mc_set_params(SAL_MC_PARAM_RENDEZ_WAKEUP
,
1916 SAL_MC_PARAM_MECHANISM_INT
,
1917 IA64_MCA_WAKEUP_VECTOR
,
1921 printk(KERN_ERR
"Failed to register wakeup interrupt with SAL "
1922 "(status %ld)\n", rc
);
1926 IA64_MCA_DEBUG("%s: registered MCA rendezvous spinloop and wakeup mech.\n", __func__
);
1928 ia64_mc_info
.imi_mca_handler
= ia64_tpa(mca_hldlr_ptr
->fp
);
1930 * XXX - disable SAL checksum by setting size to 0; should be
1931 * ia64_tpa(ia64_os_mca_dispatch_end) - ia64_tpa(ia64_os_mca_dispatch);
1933 ia64_mc_info
.imi_mca_handler_size
= 0;
1935 /* Register the os mca handler with SAL */
1936 if ((rc
= ia64_sal_set_vectors(SAL_VECTOR_OS_MCA
,
1937 ia64_mc_info
.imi_mca_handler
,
1938 ia64_tpa(mca_hldlr_ptr
->gp
),
1939 ia64_mc_info
.imi_mca_handler_size
,
1942 printk(KERN_ERR
"Failed to register OS MCA handler with SAL "
1943 "(status %ld)\n", rc
);
1947 IA64_MCA_DEBUG("%s: registered OS MCA handler with SAL at 0x%lx, gp = 0x%lx\n", __func__
,
1948 ia64_mc_info
.imi_mca_handler
, ia64_tpa(mca_hldlr_ptr
->gp
));
1951 * XXX - disable SAL checksum by setting size to 0, should be
1952 * size of the actual init handler in mca_asm.S.
1954 ia64_mc_info
.imi_monarch_init_handler
= ia64_tpa(init_hldlr_ptr_monarch
->fp
);
1955 ia64_mc_info
.imi_monarch_init_handler_size
= 0;
1956 ia64_mc_info
.imi_slave_init_handler
= ia64_tpa(init_hldlr_ptr_slave
->fp
);
1957 ia64_mc_info
.imi_slave_init_handler_size
= 0;
1959 IA64_MCA_DEBUG("%s: OS INIT handler at %lx\n", __func__
,
1960 ia64_mc_info
.imi_monarch_init_handler
);
1962 /* Register the os init handler with SAL */
1963 if ((rc
= ia64_sal_set_vectors(SAL_VECTOR_OS_INIT
,
1964 ia64_mc_info
.imi_monarch_init_handler
,
1965 ia64_tpa(ia64_getreg(_IA64_REG_GP
)),
1966 ia64_mc_info
.imi_monarch_init_handler_size
,
1967 ia64_mc_info
.imi_slave_init_handler
,
1968 ia64_tpa(ia64_getreg(_IA64_REG_GP
)),
1969 ia64_mc_info
.imi_slave_init_handler_size
)))
1971 printk(KERN_ERR
"Failed to register m/s INIT handlers with SAL "
1972 "(status %ld)\n", rc
);
1975 if (register_die_notifier(&default_init_monarch_nb
)) {
1976 printk(KERN_ERR
"Failed to register default monarch INIT process\n");
1980 IA64_MCA_DEBUG("%s: registered OS INIT handler with SAL\n", __func__
);
1983 * Configure the CMCI/P vector and handler. Interrupts for CMC are
1984 * per-processor, so AP CMC interrupts are setup in smp_callin() (smpboot.c).
1986 register_percpu_irq(IA64_CMC_VECTOR
, &cmci_irqaction
);
1987 register_percpu_irq(IA64_CMCP_VECTOR
, &cmcp_irqaction
);
1988 ia64_mca_cmc_vector_setup(); /* Setup vector on BSP */
1990 /* Setup the MCA rendezvous interrupt vector */
1991 register_percpu_irq(IA64_MCA_RENDEZ_VECTOR
, &mca_rdzv_irqaction
);
1993 /* Setup the MCA wakeup interrupt vector */
1994 register_percpu_irq(IA64_MCA_WAKEUP_VECTOR
, &mca_wkup_irqaction
);
1997 /* Setup the CPEI/P handler */
1998 register_percpu_irq(IA64_CPEP_VECTOR
, &mca_cpep_irqaction
);
2001 /* Initialize the areas set aside by the OS to buffer the
2002 * platform/processor error states for MCA/INIT/CMC
2005 ia64_log_init(SAL_INFO_TYPE_MCA
);
2006 ia64_log_init(SAL_INFO_TYPE_INIT
);
2007 ia64_log_init(SAL_INFO_TYPE_CMC
);
2008 ia64_log_init(SAL_INFO_TYPE_CPE
);
2011 printk(KERN_INFO
"MCA related initialization done\n");
2015 * ia64_mca_late_init
2017 * Opportunity to setup things that require initialization later
2018 * than ia64_mca_init. Setup a timer to poll for CPEs if the
2019 * platform doesn't support an interrupt driven mechanism.
2025 ia64_mca_late_init(void)
2030 register_hotcpu_notifier(&mca_cpu_notifier
);
2032 /* Setup the CMCI/P vector and handler */
2033 init_timer(&cmc_poll_timer
);
2034 cmc_poll_timer
.function
= ia64_mca_cmc_poll
;
2036 /* Unmask/enable the vector */
2037 cmc_polling_enabled
= 0;
2038 schedule_work(&cmc_enable_work
);
2040 IA64_MCA_DEBUG("%s: CMCI/P setup and enabled.\n", __func__
);
2043 /* Setup the CPEI/P vector and handler */
2044 cpe_vector
= acpi_request_vector(ACPI_INTERRUPT_CPEI
);
2045 init_timer(&cpe_poll_timer
);
2046 cpe_poll_timer
.function
= ia64_mca_cpe_poll
;
2052 if (cpe_vector
>= 0) {
2053 /* If platform supports CPEI, enable the irq. */
2054 irq
= local_vector_to_irq(cpe_vector
);
2056 cpe_poll_enabled
= 0;
2057 desc
= irq_desc
+ irq
;
2058 desc
->status
|= IRQ_PER_CPU
;
2059 setup_irq(irq
, &mca_cpe_irqaction
);
2061 ia64_mca_register_cpev(cpe_vector
);
2062 IA64_MCA_DEBUG("%s: CPEI/P setup and enabled.\n",
2066 printk(KERN_ERR
"%s: Failed to find irq for CPE "
2067 "interrupt handler, vector %d\n",
2068 __func__
, cpe_vector
);
2070 /* If platform doesn't support CPEI, get the timer going. */
2071 if (cpe_poll_enabled
) {
2072 ia64_mca_cpe_poll(0UL);
2073 IA64_MCA_DEBUG("%s: CPEP setup and enabled.\n", __func__
);
2081 device_initcall(ia64_mca_late_init
);