1 /*****************************************************************************\
2 * Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
3 * Copyright (C) 2007 The Regents of the University of California.
4 * Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
5 * Written by Brian Behlendorf <behlendorf1@llnl.gov>.
8 * This file is part of the SPL, Solaris Porting Layer.
9 * For details, see <http://github.com/behlendorf/spl/>.
11 * The SPL is free software; you can redistribute it and/or modify it
12 * under the terms of the GNU General Public License as published by the
13 * Free Software Foundation; either version 2 of the License, or (at your
14 * option) any later version.
16 * The SPL is distributed in the hope that it will be useful, but WITHOUT
17 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
18 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
21 * You should have received a copy of the GNU General Public License along
22 * with the SPL. If not, see <http://www.gnu.org/licenses/>.
23 *****************************************************************************
24 * Solaris Porting Layer (SPL) Debug Implementation.
25 \*****************************************************************************/
27 #include <linux/kmod.h>
29 #include <linux/vmalloc.h>
30 #include <linux/pagemap.h>
31 #include <linux/slab.h>
32 #include <linux/ctype.h>
33 #include <linux/kthread.h>
34 #include <linux/hardirq.h>
35 #include <linux/interrupt.h>
36 #include <linux/spinlock.h>
37 #include <sys/sysmacros.h>
39 #include <sys/debug.h>
42 #ifdef DEBUG_SUBSYSTEM
43 #undef DEBUG_SUBSYSTEM
46 #define DEBUG_SUBSYSTEM S_DEBUG
48 unsigned long spl_debug_subsys
= ~0;
49 EXPORT_SYMBOL(spl_debug_subsys
);
50 module_param(spl_debug_subsys
, long, 0644);
51 MODULE_PARM_DESC(spl_debug_subsys
, "Subsystem debugging level mask.");
53 unsigned long spl_debug_mask
= (D_EMERG
| D_ERROR
| D_WARNING
| D_CONSOLE
);
54 EXPORT_SYMBOL(spl_debug_mask
);
55 module_param(spl_debug_mask
, long, 0644);
56 MODULE_PARM_DESC(spl_debug_mask
, "Debugging level mask.");
58 unsigned long spl_debug_printk
= D_CANTMASK
;
59 EXPORT_SYMBOL(spl_debug_printk
);
60 module_param(spl_debug_printk
, long, 0644);
61 MODULE_PARM_DESC(spl_debug_printk
, "Console printk level mask.");
63 int spl_debug_mb
= -1;
64 EXPORT_SYMBOL(spl_debug_mb
);
65 module_param(spl_debug_mb
, int, 0644);
66 MODULE_PARM_DESC(spl_debug_mb
, "Total debug buffer size.");
68 unsigned int spl_debug_binary
= 1;
69 EXPORT_SYMBOL(spl_debug_binary
);
71 unsigned int spl_debug_catastrophe
;
72 EXPORT_SYMBOL(spl_debug_catastrophe
);
74 unsigned int spl_debug_panic_on_bug
= 1;
75 EXPORT_SYMBOL(spl_debug_panic_on_bug
);
76 module_param(spl_debug_panic_on_bug
, int, 0644);
77 MODULE_PARM_DESC(spl_debug_panic_on_bug
, "Panic on BUG");
79 static char spl_debug_file_name
[PATH_MAX
];
80 char spl_debug_file_path
[PATH_MAX
] = "/tmp/spl-log";
82 unsigned int spl_console_ratelimit
= 1;
83 EXPORT_SYMBOL(spl_console_ratelimit
);
85 long spl_console_max_delay
;
86 EXPORT_SYMBOL(spl_console_max_delay
);
88 long spl_console_min_delay
;
89 EXPORT_SYMBOL(spl_console_min_delay
);
91 unsigned int spl_console_backoff
= SPL_DEFAULT_BACKOFF
;
92 EXPORT_SYMBOL(spl_console_backoff
);
94 unsigned int spl_debug_stack
;
95 EXPORT_SYMBOL(spl_debug_stack
);
97 static int spl_panic_in_progress
;
99 union trace_data_union (*trace_data
[TCD_TYPE_MAX
])[NR_CPUS
] __cacheline_aligned
;
100 char *trace_console_buffers
[NR_CPUS
][3];
101 struct rw_semaphore trace_sem
;
102 atomic_t trace_tage_allocated
= ATOMIC_INIT(0);
104 static int spl_debug_dump_all_pages(dumplog_priv_t
*dp
, char *);
105 static void trace_fini(void);
108 /* Memory percentage breakdown by type */
109 static unsigned int pages_factor
[TCD_TYPE_MAX
] = {
110 80, /* 80% pages for TCD_TYPE_PROC */
111 10, /* 10% pages for TCD_TYPE_SOFTIRQ */
112 10 /* 10% pages for TCD_TYPE_IRQ */
116 spl_debug_subsys2str(int subsys
)
159 spl_debug_dbg2str(int debug
)
186 spl_debug_mask2str(char *str
, int size
, unsigned long mask
, int is_subsys
)
188 const char *(*fn
)(int bit
) = is_subsys
? spl_debug_subsys2str
:
193 if (mask
== 0) { /* "0" */
197 } else { /* space-separated tokens */
198 for (i
= 0; i
< 32; i
++) {
201 if ((mask
& bit
) == 0)
205 if (token
== NULL
) /* unused bit */
208 if (len
> 0) { /* separator? */
214 while (*token
!= 0) {
223 /* terminate 'str' */
233 spl_debug_token2mask(int *mask
, const char *str
, int len
, int is_subsys
)
235 const char *(*fn
)(int bit
) = is_subsys
? spl_debug_subsys2str
:
240 /* match against known tokens */
241 for (i
= 0; i
< 32; i
++) {
245 if (token
== NULL
) /* unused? */
250 if (j
== len
) { /* end of token */
261 if (str
[j
] == token
[j
])
264 if (str
[j
] < 'A' || 'Z' < str
[j
])
267 if (str
[j
] - 'A' + 'a' != token
[j
])
272 return -EINVAL
; /* no match */
276 spl_debug_str2mask(unsigned long *mask
, const char *str
, int is_subsys
)
279 int m
= 0, matched
, n
, t
;
281 /* Allow a number for backwards compatibility */
282 for (n
= strlen(str
); n
> 0; n
--)
283 if (!isspace(str
[n
-1]))
287 if ((t
= sscanf(str
, "%i%n", &m
, &matched
)) >= 1 && matched
== n
) {
292 /* <str> must be a list of debug tokens or numbers separated by
293 * whitespace and optionally an operator ('+' or '-'). If an operator
294 * appears first in <str>, '*mask' is used as the starting point
295 * (relative), otherwise 0 is used (absolute). An operator applies to
296 * all following tokens up to the next operator. */
299 while (isspace(*str
)) /* skip whitespace */
305 if (*str
== '+' || *str
== '-') {
308 /* op on first token == relative */
312 while (isspace(*str
)) /* skip whitespace */
315 if (*str
== 0) /* trailing op */
319 /* find token length */
320 for (n
= 0; str
[n
] != 0 && !isspace(str
[n
]); n
++);
323 if (spl_debug_token2mask(&t
, str
, n
, is_subsys
) != 0)
343 spl_debug_dumplog_internal(dumplog_priv_t
*dp
)
347 journal_info
= current
->journal_info
;
348 current
->journal_info
= NULL
;
350 snprintf(spl_debug_file_name
, sizeof(spl_debug_file_path
) - 1,
351 "%s.%ld.%ld", spl_debug_file_path
,
352 get_seconds(), (long)dp
->dp_pid
);
353 printk("SPL: Dumping log to %s\n", spl_debug_file_name
);
354 spl_debug_dump_all_pages(dp
, spl_debug_file_name
);
356 current
->journal_info
= journal_info
;
360 spl_debug_dumplog_thread(void *arg
)
362 dumplog_priv_t
*dp
= (dumplog_priv_t
*)arg
;
364 spl_debug_dumplog_internal(dp
);
365 atomic_set(&dp
->dp_done
, 1);
366 wake_up(&dp
->dp_waitq
);
367 complete_and_exit(NULL
, 0);
369 return 0; /* Unreachable */
372 /* When flag is set do not use a new thread for the debug dump */
374 spl_debug_dumplog(int flags
)
376 struct task_struct
*tsk
;
379 init_waitqueue_head(&dp
.dp_waitq
);
380 dp
.dp_pid
= current
->pid
;
382 atomic_set(&dp
.dp_done
, 0);
384 if (dp
.dp_flags
& DL_NOTHREAD
) {
385 spl_debug_dumplog_internal(&dp
);
388 tsk
= kthread_create(spl_debug_dumplog_thread
,(void *)&dp
,"spl_debug");
392 wake_up_process(tsk
);
393 wait_event(dp
.dp_waitq
, atomic_read(&dp
.dp_done
));
398 EXPORT_SYMBOL(spl_debug_dumplog
);
401 trace_get_console_buffer(void)
408 } else if (in_softirq()) {
414 return trace_console_buffers
[cpu
][idx
];
418 trace_put_console_buffer(char *buffer
)
424 trace_lock_tcd(struct trace_cpu_data
*tcd
)
426 __ASSERT(tcd
->tcd_type
< TCD_TYPE_MAX
);
428 spin_lock_irqsave(&tcd
->tcd_lock
, tcd
->tcd_lock_flags
);
434 trace_unlock_tcd(struct trace_cpu_data
*tcd
)
436 __ASSERT(tcd
->tcd_type
< TCD_TYPE_MAX
);
438 spin_unlock_irqrestore(&tcd
->tcd_lock
, tcd
->tcd_lock_flags
);
441 static struct trace_cpu_data
*
445 struct trace_cpu_data
*tcd
;
449 tcd
= &(*trace_data
[TCD_TYPE_IRQ
])[cpu
].tcd
;
450 else if (in_softirq())
451 tcd
= &(*trace_data
[TCD_TYPE_SOFTIRQ
])[cpu
].tcd
;
453 tcd
= &(*trace_data
[TCD_TYPE_PROC
])[cpu
].tcd
;
461 trace_put_tcd (struct trace_cpu_data
*tcd
)
463 trace_unlock_tcd(tcd
);
469 trace_set_debug_header(struct spl_debug_header
*header
, int subsys
,
470 int mask
, const int line
, unsigned long stack
)
474 do_gettimeofday(&tv
);
476 header
->ph_subsys
= subsys
;
477 header
->ph_mask
= mask
;
478 header
->ph_cpu_id
= smp_processor_id();
479 header
->ph_sec
= (__u32
)tv
.tv_sec
;
480 header
->ph_usec
= tv
.tv_usec
;
481 header
->ph_stack
= stack
;
482 header
->ph_pid
= current
->pid
;
483 header
->ph_line_num
= line
;
489 trace_print_to_console(struct spl_debug_header
*hdr
, int mask
, const char *buf
,
490 int len
, const char *file
, const char *fn
)
492 char *prefix
= "SPL", *ptype
= NULL
;
494 if ((mask
& D_EMERG
) != 0) {
497 } else if ((mask
& D_ERROR
) != 0) {
500 } else if ((mask
& D_WARNING
) != 0) {
502 ptype
= KERN_WARNING
;
503 } else if ((mask
& (D_CONSOLE
| spl_debug_printk
)) != 0) {
508 if ((mask
& D_CONSOLE
) != 0) {
509 printk("%s%s: %.*s", ptype
, prefix
, len
, buf
);
511 printk("%s%s: %d:%d:(%s:%d:%s()) %.*s", ptype
, prefix
,
512 hdr
->ph_pid
, hdr
->ph_stack
, file
,
513 hdr
->ph_line_num
, fn
, len
, buf
);
520 trace_max_debug_mb(void)
522 return MAX(512, ((num_physpages
>> (20 - PAGE_SHIFT
)) * 80) / 100);
525 static struct trace_page
*
529 struct trace_page
*tage
;
531 page
= alloc_pages(gfp
| __GFP_NOWARN
, 0);
535 tage
= kmalloc(sizeof(*tage
), gfp
);
537 __free_pages(page
, 0);
542 atomic_inc(&trace_tage_allocated
);
548 tage_free(struct trace_page
*tage
)
550 __ASSERT(tage
!= NULL
);
551 __ASSERT(tage
->page
!= NULL
);
553 __free_pages(tage
->page
, 0);
555 atomic_dec(&trace_tage_allocated
);
558 static struct trace_page
*
559 tage_from_list(struct list_head
*list
)
561 return list_entry(list
, struct trace_page
, linkage
);
565 tage_to_tail(struct trace_page
*tage
, struct list_head
*queue
)
567 __ASSERT(tage
!= NULL
);
568 __ASSERT(queue
!= NULL
);
570 list_move_tail(&tage
->linkage
, queue
);
573 /* try to return a page that has 'len' bytes left at the end */
574 static struct trace_page
*
575 trace_get_tage_try(struct trace_cpu_data
*tcd
, unsigned long len
)
577 struct trace_page
*tage
;
579 if (tcd
->tcd_cur_pages
> 0) {
580 __ASSERT(!list_empty(&tcd
->tcd_pages
));
581 tage
= tage_from_list(tcd
->tcd_pages
.prev
);
582 if (tage
->used
+ len
<= PAGE_SIZE
)
586 if (tcd
->tcd_cur_pages
< tcd
->tcd_max_pages
) {
587 if (tcd
->tcd_cur_stock_pages
> 0) {
588 tage
= tage_from_list(tcd
->tcd_stock_pages
.prev
);
589 tcd
->tcd_cur_stock_pages
--;
590 list_del_init(&tage
->linkage
);
592 tage
= tage_alloc(GFP_ATOMIC
);
595 "failure to allocate a tage (%ld)\n",
602 tage
->cpu
= smp_processor_id();
603 tage
->type
= tcd
->tcd_type
;
604 list_add_tail(&tage
->linkage
, &tcd
->tcd_pages
);
605 tcd
->tcd_cur_pages
++;
613 /* return a page that has 'len' bytes left at the end */
614 static struct trace_page
*
615 trace_get_tage(struct trace_cpu_data
*tcd
, unsigned long len
)
617 struct trace_page
*tage
;
619 __ASSERT(len
<= PAGE_SIZE
);
621 tage
= trace_get_tage_try(tcd
, len
);
625 if (tcd
->tcd_cur_pages
> 0) {
626 tage
= tage_from_list(tcd
->tcd_pages
.next
);
628 tage_to_tail(tage
, &tcd
->tcd_pages
);
635 spl_debug_vmsg(spl_debug_limit_state_t
*cdls
, int subsys
, int mask
,
636 const char *file
, const char *fn
, const int line
,
637 const char *format1
, va_list args
, const char *format2
, ...)
639 struct trace_cpu_data
*tcd
= NULL
;
640 struct spl_debug_header header
= { 0, };
641 struct trace_page
*tage
;
642 /* string_buf is used only if tcd != NULL, and is always set then */
643 char *string_buf
= NULL
;
646 int needed
= 85; /* average message length */
652 if (strchr(file
, '/'))
653 file
= strrchr(file
, '/') + 1;
655 trace_set_debug_header(&header
, subsys
, mask
, line
, CDEBUG_STACK());
657 tcd
= trace_get_tcd();
661 if (tcd
->tcd_shutting_down
) {
667 known_size
= strlen(file
) + 1;
669 known_size
+= strlen(fn
) + 1;
671 if (spl_debug_binary
)
672 known_size
+= sizeof(header
);
674 /* '2' used because vsnprintf returns real size required for output
675 * _without_ terminating NULL. */
676 for (i
= 0; i
< 2; i
++) {
677 tage
= trace_get_tage(tcd
, needed
+ known_size
+ 1);
679 if (needed
+ known_size
> PAGE_SIZE
)
687 string_buf
= (char *)page_address(tage
->page
) +
688 tage
->used
+ known_size
;
690 max_nob
= PAGE_SIZE
- tage
->used
- known_size
;
692 printk(KERN_EMERG
"negative max_nob: %i\n", max_nob
);
702 needed
= vsnprintf(string_buf
, max_nob
, format1
, ap
);
707 remain
= max_nob
- needed
;
711 va_start(ap
, format2
);
712 needed
+= vsnprintf(string_buf
+needed
, remain
, format2
, ap
);
716 if (needed
< max_nob
)
720 header
.ph_len
= known_size
+ needed
;
721 debug_buf
= (char *)page_address(tage
->page
) + tage
->used
;
723 if (spl_debug_binary
) {
724 memcpy(debug_buf
, &header
, sizeof(header
));
725 tage
->used
+= sizeof(header
);
726 debug_buf
+= sizeof(header
);
729 strcpy(debug_buf
, file
);
730 tage
->used
+= strlen(file
) + 1;
731 debug_buf
+= strlen(file
) + 1;
734 strcpy(debug_buf
, fn
);
735 tage
->used
+= strlen(fn
) + 1;
736 debug_buf
+= strlen(fn
) + 1;
739 __ASSERT(debug_buf
== string_buf
);
741 tage
->used
+= needed
;
742 __ASSERT (tage
->used
<= PAGE_SIZE
);
745 if ((mask
& spl_debug_printk
) == 0) {
746 /* no console output requested */
753 if (spl_console_ratelimit
&& cdls
->cdls_next
!= 0 &&
754 !time_before(cdls
->cdls_next
, jiffies
)) {
755 /* skipping a console message */
762 if (time_before(cdls
->cdls_next
+ spl_console_max_delay
+
763 (10 * HZ
), jiffies
)) {
764 /* last timeout was a long time ago */
765 cdls
->cdls_delay
/= spl_console_backoff
* 4;
767 cdls
->cdls_delay
*= spl_console_backoff
;
769 if (cdls
->cdls_delay
< spl_console_min_delay
)
770 cdls
->cdls_delay
= spl_console_min_delay
;
771 else if (cdls
->cdls_delay
> spl_console_max_delay
)
772 cdls
->cdls_delay
= spl_console_max_delay
;
775 /* ensure cdls_next is never zero after it's been seen */
776 cdls
->cdls_next
= (jiffies
+ cdls
->cdls_delay
) | 1;
780 trace_print_to_console(&header
, mask
, string_buf
, needed
, file
, fn
);
783 string_buf
= trace_get_console_buffer();
786 if (format1
!= NULL
) {
788 needed
= vsnprintf(string_buf
, TRACE_CONSOLE_BUFFER_SIZE
, format1
, ap
);
791 if (format2
!= NULL
) {
792 remain
= TRACE_CONSOLE_BUFFER_SIZE
- needed
;
794 va_start(ap
, format2
);
795 needed
+= vsnprintf(string_buf
+needed
, remain
, format2
, ap
);
799 trace_print_to_console(&header
, mask
,
800 string_buf
, needed
, file
, fn
);
802 trace_put_console_buffer(string_buf
);
805 if (cdls
!= NULL
&& cdls
->cdls_count
!= 0) {
806 string_buf
= trace_get_console_buffer();
808 needed
= snprintf(string_buf
, TRACE_CONSOLE_BUFFER_SIZE
,
809 "Skipped %d previous similar message%s\n",
810 cdls
->cdls_count
, (cdls
->cdls_count
> 1) ? "s" : "");
812 trace_print_to_console(&header
, mask
,
813 string_buf
, needed
, file
, fn
);
815 trace_put_console_buffer(string_buf
);
816 cdls
->cdls_count
= 0;
821 EXPORT_SYMBOL(spl_debug_vmsg
);
823 /* Do the collect_pages job on a single CPU: assumes that all other
824 * CPUs have been stopped during a panic. If this isn't true for
825 * some arch, this will have to be implemented separately in each arch.
828 collect_pages_from_single_cpu(struct page_collection
*pc
)
830 struct trace_cpu_data
*tcd
;
833 tcd_for_each(tcd
, i
, j
) {
834 list_splice_init(&tcd
->tcd_pages
, &pc
->pc_pages
);
835 tcd
->tcd_cur_pages
= 0;
840 collect_pages_on_all_cpus(struct page_collection
*pc
)
842 struct trace_cpu_data
*tcd
;
845 spin_lock(&pc
->pc_lock
);
846 for_each_possible_cpu(cpu
) {
847 tcd_for_each_type_lock(tcd
, i
, cpu
) {
848 list_splice_init(&tcd
->tcd_pages
, &pc
->pc_pages
);
849 tcd
->tcd_cur_pages
= 0;
852 spin_unlock(&pc
->pc_lock
);
856 collect_pages(dumplog_priv_t
*dp
, struct page_collection
*pc
)
858 INIT_LIST_HEAD(&pc
->pc_pages
);
860 if (spl_panic_in_progress
|| dp
->dp_flags
& DL_SINGLE_CPU
)
861 collect_pages_from_single_cpu(pc
);
863 collect_pages_on_all_cpus(pc
);
867 put_pages_back_on_all_cpus(struct page_collection
*pc
)
869 struct trace_cpu_data
*tcd
;
870 struct list_head
*cur_head
;
871 struct trace_page
*tage
;
872 struct trace_page
*tmp
;
875 spin_lock(&pc
->pc_lock
);
877 for_each_possible_cpu(cpu
) {
878 tcd_for_each_type_lock(tcd
, i
, cpu
) {
879 cur_head
= tcd
->tcd_pages
.next
;
881 list_for_each_entry_safe(tage
, tmp
, &pc
->pc_pages
,
884 __ASSERT_TAGE_INVARIANT(tage
);
886 if (tage
->cpu
!= cpu
|| tage
->type
!= i
)
889 tage_to_tail(tage
, cur_head
);
890 tcd
->tcd_cur_pages
++;
895 spin_unlock(&pc
->pc_lock
);
899 put_pages_back(struct page_collection
*pc
)
901 if (!spl_panic_in_progress
)
902 put_pages_back_on_all_cpus(pc
);
906 trace_filp_open (const char *name
, int flags
, int mode
, int *err
)
908 struct file
*filp
= NULL
;
911 filp
= filp_open(name
, flags
, mode
);
914 printk(KERN_ERR
"SPL: Can't open %s file: %d\n", name
, rc
);
922 #define trace_filp_write(fp, b, s, p) (fp)->f_op->write((fp), (b), (s), p)
923 #define trace_filp_fsync(fp) (fp)->f_op->fsync((fp),(fp)->f_dentry,1)
924 #define trace_filp_close(f) filp_close(f, NULL)
925 #define trace_filp_poff(f) (&(f)->f_pos)
928 spl_debug_dump_all_pages(dumplog_priv_t
*dp
, char *filename
)
930 struct page_collection pc
;
932 struct trace_page
*tage
;
933 struct trace_page
*tmp
;
937 down_write(&trace_sem
);
939 filp
= trace_filp_open(filename
, O_CREAT
|O_EXCL
|O_WRONLY
|O_LARGEFILE
,
943 printk(KERN_ERR
"SPL: Can't open %s for dump: %d\n",
948 spin_lock_init(&pc
.pc_lock
);
949 collect_pages(dp
, &pc
);
950 if (list_empty(&pc
.pc_pages
)) {
958 list_for_each_entry_safe(tage
, tmp
, &pc
.pc_pages
, linkage
) {
959 __ASSERT_TAGE_INVARIANT(tage
);
961 rc
= trace_filp_write(filp
, page_address(tage
->page
),
962 tage
->used
, trace_filp_poff(filp
));
963 if (rc
!= (int)tage
->used
) {
964 printk(KERN_WARNING
"SPL: Wanted to write %u "
965 "but wrote %d\n", tage
->used
, rc
);
967 __ASSERT(list_empty(&pc
.pc_pages
));
970 list_del(&tage
->linkage
);
976 rc
= trace_filp_fsync(filp
);
978 printk(KERN_ERR
"SPL: Unable to sync: %d\n", rc
);
980 trace_filp_close(filp
);
982 up_write(&trace_sem
);
988 spl_debug_flush_pages(void)
991 struct page_collection pc
;
992 struct trace_page
*tage
;
993 struct trace_page
*tmp
;
995 spin_lock_init(&pc
.pc_lock
);
996 init_waitqueue_head(&dp
.dp_waitq
);
997 dp
.dp_pid
= current
->pid
;
999 atomic_set(&dp
.dp_done
, 0);
1001 collect_pages(&dp
, &pc
);
1002 list_for_each_entry_safe(tage
, tmp
, &pc
.pc_pages
, linkage
) {
1003 __ASSERT_TAGE_INVARIANT(tage
);
1004 list_del(&tage
->linkage
);
1010 spl_debug_set_mask(unsigned long mask
) {
1011 spl_debug_mask
= mask
;
1014 EXPORT_SYMBOL(spl_debug_set_mask
);
1017 spl_debug_get_mask(void) {
1018 return spl_debug_mask
;
1020 EXPORT_SYMBOL(spl_debug_get_mask
);
1023 spl_debug_set_subsys(unsigned long subsys
) {
1024 spl_debug_subsys
= subsys
;
1027 EXPORT_SYMBOL(spl_debug_set_subsys
);
1030 spl_debug_get_subsys(void) {
1031 return spl_debug_subsys
;
1033 EXPORT_SYMBOL(spl_debug_get_subsys
);
1036 spl_debug_set_mb(int mb
)
1039 int limit
= trace_max_debug_mb();
1040 struct trace_cpu_data
*tcd
;
1042 if (mb
< num_possible_cpus()) {
1043 printk(KERN_ERR
"SPL: Refusing to set debug buffer size to "
1044 "%dMB - lower limit is %d\n", mb
, num_possible_cpus());
1049 printk(KERN_ERR
"SPL: Refusing to set debug buffer size to "
1050 "%dMB - upper limit is %d\n", mb
, limit
);
1054 mb
/= num_possible_cpus();
1055 pages
= mb
<< (20 - PAGE_SHIFT
);
1057 down_write(&trace_sem
);
1059 tcd_for_each(tcd
, i
, j
)
1060 tcd
->tcd_max_pages
= (pages
* tcd
->tcd_pages_factor
) / 100;
1062 up_write(&trace_sem
);
1066 EXPORT_SYMBOL(spl_debug_set_mb
);
1069 spl_debug_get_mb(void)
1072 struct trace_cpu_data
*tcd
;
1073 int total_pages
= 0;
1075 down_read(&trace_sem
);
1077 tcd_for_each(tcd
, i
, j
)
1078 total_pages
+= tcd
->tcd_max_pages
;
1080 up_read(&trace_sem
);
1082 return (total_pages
>> (20 - PAGE_SHIFT
)) + 1;
1084 EXPORT_SYMBOL(spl_debug_get_mb
);
1086 void spl_debug_dumpstack(struct task_struct
*tsk
)
1088 extern void show_task(struct task_struct
*);
1093 printk("SPL: Showing stack for process %d\n", tsk
->pid
);
1096 EXPORT_SYMBOL(spl_debug_dumpstack
);
1098 void spl_debug_bug(char *file
, const char *func
, const int line
, int flags
)
1100 spl_debug_catastrophe
= 1;
1101 spl_debug_msg(NULL
, 0, D_EMERG
, file
, func
, line
, "SBUG\n");
1103 if (in_interrupt()) {
1104 panic("SBUG in interrupt.\n");
1108 if (in_atomic() || irqs_disabled())
1109 flags
|= DL_NOTHREAD
;
1111 /* Ensure all debug pages and dumped by current cpu */
1112 if (spl_debug_panic_on_bug
)
1113 spl_panic_in_progress
= 1;
1115 spl_debug_dumpstack(NULL
);
1116 spl_debug_dumplog(flags
);
1118 if (spl_debug_panic_on_bug
)
1121 set_task_state(current
, TASK_UNINTERRUPTIBLE
);
1125 EXPORT_SYMBOL(spl_debug_bug
);
1128 spl_debug_clear_buffer(void)
1130 spl_debug_flush_pages();
1133 EXPORT_SYMBOL(spl_debug_clear_buffer
);
1136 spl_debug_mark_buffer(char *text
)
1138 CDEBUG(D_WARNING
, "*************************************\n");
1139 CDEBUG(D_WARNING
, "DEBUG MARKER: %s\n", text
);
1140 CDEBUG(D_WARNING
, "*************************************\n");
1144 EXPORT_SYMBOL(spl_debug_mark_buffer
);
1147 trace_init(int max_pages
)
1149 struct trace_cpu_data
*tcd
;
1152 init_rwsem(&trace_sem
);
1154 /* initialize trace_data */
1155 memset(trace_data
, 0, sizeof(trace_data
));
1156 for (i
= 0; i
< TCD_TYPE_MAX
; i
++) {
1157 trace_data
[i
] = kmalloc(sizeof(union trace_data_union
) *
1158 NR_CPUS
, GFP_KERNEL
);
1159 if (trace_data
[i
] == NULL
)
1163 tcd_for_each(tcd
, i
, j
) {
1164 spin_lock_init(&tcd
->tcd_lock
);
1165 tcd
->tcd_pages_factor
= pages_factor
[i
];
1168 INIT_LIST_HEAD(&tcd
->tcd_pages
);
1169 INIT_LIST_HEAD(&tcd
->tcd_stock_pages
);
1170 tcd
->tcd_cur_pages
= 0;
1171 tcd
->tcd_cur_stock_pages
= 0;
1172 tcd
->tcd_max_pages
= (max_pages
* pages_factor
[i
]) / 100;
1173 tcd
->tcd_shutting_down
= 0;
1176 for (i
= 0; i
< num_possible_cpus(); i
++) {
1177 for (j
= 0; j
< 3; j
++) {
1178 trace_console_buffers
[i
][j
] =
1179 kmalloc(TRACE_CONSOLE_BUFFER_SIZE
,
1182 if (trace_console_buffers
[i
][j
] == NULL
)
1190 printk(KERN_ERR
"SPL: Insufficient memory for debug logs\n");
1197 int rc
, max
= spl_debug_mb
;
1199 spl_console_max_delay
= SPL_DEFAULT_MAX_DELAY
;
1200 spl_console_min_delay
= SPL_DEFAULT_MIN_DELAY
;
1202 /* If spl_debug_mb is set to an invalid value or uninitialized
1203 * then just make the total buffers smp_num_cpus TCD_MAX_PAGES */
1204 if (max
> (num_physpages
>> (20 - 2 - PAGE_SHIFT
)) / 5 ||
1205 max
>= 512 || max
< 0) {
1206 max
= TCD_MAX_PAGES
;
1208 max
= (max
/ num_online_cpus()) << (20 - PAGE_SHIFT
);
1211 rc
= trace_init(max
);
1219 trace_cleanup_on_all_cpus(void)
1221 struct trace_cpu_data
*tcd
;
1222 struct trace_page
*tage
;
1223 struct trace_page
*tmp
;
1226 for_each_possible_cpu(cpu
) {
1227 tcd_for_each_type_lock(tcd
, i
, cpu
) {
1228 tcd
->tcd_shutting_down
= 1;
1230 list_for_each_entry_safe(tage
, tmp
, &tcd
->tcd_pages
,
1232 __ASSERT_TAGE_INVARIANT(tage
);
1234 list_del(&tage
->linkage
);
1237 tcd
->tcd_cur_pages
= 0;
1247 trace_cleanup_on_all_cpus();
1249 for (i
= 0; i
< num_possible_cpus(); i
++) {
1250 for (j
= 0; j
< 3; j
++) {
1251 if (trace_console_buffers
[i
][j
] != NULL
) {
1252 kfree(trace_console_buffers
[i
][j
]);
1253 trace_console_buffers
[i
][j
] = NULL
;
1258 for (i
= 0; i
< TCD_TYPE_MAX
&& trace_data
[i
] != NULL
; i
++) {
1259 kfree(trace_data
[i
]);
1260 trace_data
[i
] = NULL
;