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zfs/include/sys/debug.h

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/*
* This file is part of the SPL: Solaris Porting Layer.
*
* Copyright (c) 2008 Lawrence Livermore National Security, LLC.
* Produced at Lawrence Livermore National Laboratory
* Written by:
* Brian Behlendorf <behlendorf1@llnl.gov>,
* Herb Wartens <wartens2@llnl.gov>,
* Jim Garlick <garlick@llnl.gov>
* UCRL-CODE-235197
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef _SPL_DEBUG_H
#define _SPL_DEBUG_H
#ifdef __cplusplus
extern "C" {
#endif
#include <linux/sched.h> /* THREAD_SIZE */
#include <linux/proc_fs.h>
extern unsigned long spl_debug_mask;
extern unsigned long spl_debug_subsys;
#define S_UNDEFINED 0x00000001
#define S_ATOMIC 0x00000002
#define S_KOBJ 0x00000004
#define S_VNODE 0x00000008
#define S_TIME 0x00000010
#define S_RWLOCK 0x00000020
#define S_THREAD 0x00000040
#define S_CONDVAR 0x00000080
#define S_MUTEX 0x00000100
#define S_RNG 0x00000200
#define S_TASKQ 0x00000400
#define S_KMEM 0x00000800
#define S_DEBUG 0x00001000
#define S_GENERIC 0x00002000
#define S_PROC 0x00004000
#define S_MODULE 0x00008000
#define D_TRACE 0x00000001
#define D_INFO 0x00000002
#define D_WARNING 0x00000004
#define D_ERROR 0x00000008
#define D_EMERG 0x00000010
#define D_CONSOLE 0x00000020
#define D_IOCTL 0x00000040
#define D_DPRINTF 0x00000080
#define D_OTHER 0x00000100
#define D_CANTMASK (D_ERROR | D_EMERG | D_WARNING | D_CONSOLE)
#define DEBUG_SUBSYSTEM S_UNDEFINED
int debug_init(void);
void debug_fini(void);
int spl_debug_mask2str(char *str, int size, unsigned long mask, int is_subsys);
int spl_debug_str2mask(unsigned long *mask, const char *str, int is_subsys);
extern unsigned long spl_debug_subsys;
extern unsigned long spl_debug_mask;
extern unsigned long spl_debug_printk;
extern int spl_debug_mb;
extern unsigned int spl_debug_binary;
extern unsigned int spl_debug_catastrophe;
extern unsigned int spl_debug_panic_on_bug;
extern char spl_debug_file_path[PATH_MAX];
extern unsigned int spl_console_ratelimit;
extern long spl_console_max_delay;
extern long spl_console_min_delay;
extern unsigned int spl_console_backoff;
extern unsigned int spl_debug_stack;
#define TCD_MAX_PAGES (5 << (20 - PAGE_SHIFT))
#define TCD_STOCK_PAGES (TCD_MAX_PAGES)
#define TRACE_CONSOLE_BUFFER_SIZE 1024
#define SPL_DEFAULT_MAX_DELAY (600 * HZ)
#define SPL_DEFAULT_MIN_DELAY ((HZ + 1) / 2)
#define SPL_DEFAULT_BACKOFF 2
#define DL_NOTHREAD 0x0001 /* Do not create a new thread */
#define DL_SINGLE_CPU 0x0002 /* Collect pages from this CPU */
typedef struct dumplog_priv {
wait_queue_head_t dp_waitq;
pid_t dp_pid;
int dp_flags;
atomic_t dp_done;
} dumplog_priv_t;
typedef struct {
unsigned long cdls_next;
int cdls_count;
long cdls_delay;
} spl_debug_limit_state_t;
/* Three trace data types */
typedef enum {
TCD_TYPE_PROC,
TCD_TYPE_SOFTIRQ,
TCD_TYPE_IRQ,
TCD_TYPE_MAX
} tcd_type_t;
union trace_data_union {
struct trace_cpu_data {
/* pages with trace records not yet processed by tracefiled */
struct list_head tcd_pages;
/* number of pages on ->tcd_pages */
unsigned long tcd_cur_pages;
/* Max number of pages allowed on ->tcd_pages */
unsigned long tcd_max_pages;
/*
* preallocated pages to write trace records into. Pages from
* ->tcd_stock_pages are moved to ->tcd_pages by spl_debug_msg().
*
* This list is necessary, because on some platforms it's
* impossible to perform efficient atomic page allocation in a
* non-blockable context.
*
* Such platforms fill ->tcd_stock_pages "on occasion", when
* tracing code is entered in blockable context.
*
* trace_get_tage_try() tries to get a page from
* ->tcd_stock_pages first and resorts to atomic page
* allocation only if this queue is empty. ->tcd_stock_pages
* is replenished when tracing code is entered in blocking
* context (darwin-tracefile.c:trace_get_tcd()). We try to
* maintain TCD_STOCK_PAGES (40 by default) pages in this
* queue. Atomic allocation is only required if more than
* TCD_STOCK_PAGES pagesful are consumed by trace records all
* emitted in non-blocking contexts. Which is quite unlikely.
*/
struct list_head tcd_stock_pages;
/* number of pages on ->tcd_stock_pages */
unsigned long tcd_cur_stock_pages;
unsigned short tcd_shutting_down;
unsigned short tcd_cpu;
unsigned short tcd_type;
/* The factors to share debug memory. */
unsigned short tcd_pages_factor;
} tcd;
char __pad[L1_CACHE_ALIGN(sizeof(struct trace_cpu_data))];
};
extern union trace_data_union (*trace_data[TCD_TYPE_MAX])[NR_CPUS];
#define tcd_for_each(tcd, i, j) \
for (i = 0; trace_data[i] != NULL; i++) \
for (j = 0, ((tcd) = &(*trace_data[i])[j].tcd); \
j < num_possible_cpus(); j++, (tcd) = &(*trace_data[i])[j].tcd)
#define tcd_for_each_type_lock(tcd, i) \
for (i = 0; trace_data[i] && \
(tcd = &(*trace_data[i])[smp_processor_id()].tcd) && \
trace_lock_tcd(tcd); trace_unlock_tcd(tcd), i++)
struct trace_page {
struct page * page; /* page itself */
struct list_head linkage; /* Used by lists in trace_data_union */
unsigned int used; /* number of bytes used within this page */
unsigned short cpu; /* cpu that owns this page */
unsigned short type; /* type(context) of this page */
};
struct page_collection {
struct list_head pc_pages;
spinlock_t pc_lock;
int pc_want_daemon_pages;
};
#define SBUG() spl_debug_bug(__FILE__, __FUNCTION__, __LINE__, 0);
#ifdef NDEBUG
#define CDEBUG_STACK() (0)
#define CDEBUG(mask, format, a...) ((void)0)
#define CWARN(fmt, a...) ((void)0)
#define CERROR(fmt, a...) ((void)0)
#define CEMERG(fmt, a...) ((void)0)
#define CONSOLE(mask, fmt, a...) ((void)0)
#define ENTRY ((void)0)
#define EXIT ((void)0)
#define RETURN(x) return (x)
#define GOTO(x, y) { ((void)(y)); goto x; }
#define __ASSERT(x) ((void)0)
#define __ASSERT_TAGE_INVARIANT(x) ((void)0)
#define ASSERT(x) ((void)0)
#define VERIFY(x) ((void)(x))
#define VERIFY3_IMPL(x, y, z, t, f, c) if (x == z) ((void)0)
#define VERIFY3S(x,y,z) VERIFY3_IMPL(x, y, z, int64_t, "%ld", (long))
#define VERIFY3U(x,y,z) VERIFY3_IMPL(x, y, z, uint64_t, "%lu", (unsigned long))
#define VERIFY3P(x,y,z) VERIFY3_IMPL(x, y, z, uintptr_t, "%p", (void *))
#define ASSERT3S(x,y,z) VERIFY3S(x, y, z)
#define ASSERT3U(x,y,z) VERIFY3U(x, y, z)
#define ASSERT3P(x,y,z) VERIFY3P(x, y, z)
#else /* NDEBUG */
#ifdef __ia64__
#define CDEBUG_STACK() (THREAD_SIZE - \
((unsigned long)__builtin_dwarf_cfa() & \
(THREAD_SIZE - 1)))
#else
#define CDEBUG_STACK() (THREAD_SIZE - \
((unsigned long)__builtin_frame_address(0) & \
(THREAD_SIZE - 1)))
# endif /* __ia64__ */
/* DL_SINGLE_CPU flag is passed to spl_debug_bug() because we are about
* to over run our stack and likely damage at least one other unknown
* thread stack. We must finish generating the needed debug info within
* this thread context because once we yeild the CPU its very likely
* the system will crash.
*/
#define __CHECK_STACK(file, func, line) \
do { \
if (unlikely(CDEBUG_STACK() > spl_debug_stack)) { \
spl_debug_stack = CDEBUG_STACK(); \
\
if (unlikely(CDEBUG_STACK() > (4 * THREAD_SIZE) / 5)) { \
spl_debug_msg(NULL, D_TRACE, D_WARNING, \
file, func, line, "Error " \
"exceeded maximum safe stack " \
"size (%lu/%lu)\n", \
CDEBUG_STACK(), THREAD_SIZE); \
spl_debug_bug(file, func, line, DL_SINGLE_CPU); \
} \
} \
} while (0)
#define CHECK_STACK() __CHECK_STACK(__FILE__, __func__, __LINE__)
/* ASSERTION that is safe to use within the debug system */
#define __ASSERT(cond) \
do { \
if (unlikely(!(cond))) { \
printk(KERN_ERR "ASSERTION(" #cond ") failed"); \
BUG(); \
} \
} while (0)
#define __ASSERT_TAGE_INVARIANT(tage) \
do { \
__ASSERT(tage != NULL); \
__ASSERT(tage->page != NULL); \
__ASSERT(tage->used <= PAGE_SIZE); \
__ASSERT(page_count(tage->page) > 0); \
} while(0)
/* ASSERTION that will debug log used outside the debug sysytem */
#define ASSERT(cond) \
do { \
CHECK_STACK(); \
\
if (unlikely(!(cond))) { \
spl_debug_msg(NULL, DEBUG_SUBSYSTEM, D_EMERG, \
__FILE__, __FUNCTION__, __LINE__, \
"ASSERTION(" #cond ") failed\n"); \
SBUG(); \
} \
} while (0)
#define ASSERTF(cond, fmt, a...) \
do { \
CHECK_STACK(); \
\
if (unlikely(!(cond))) { \
spl_debug_msg(NULL, DEBUG_SUBSYSTEM, D_EMERG, \
__FILE__, __FUNCTION__, __LINE__, \
"ASSERTION(" #cond ") failed: " fmt, \
## a); \
SBUG(); \
} \
} while (0)
#define VERIFY3_IMPL(LEFT, OP, RIGHT, TYPE, FMT, CAST) \
do { \
CHECK_STACK(); \
\
if (!((TYPE)(LEFT) OP (TYPE)(RIGHT))) { \
spl_debug_msg(NULL, DEBUG_SUBSYSTEM, D_EMERG, \
__FILE__, __FUNCTION__, __LINE__, \
"VERIFY3(" FMT " " #OP " " FMT ")\n", \
CAST (LEFT), CAST (RIGHT)); \
SBUG(); \
} \
} while (0)
#define VERIFY3S(x,y,z) VERIFY3_IMPL(x, y, z, int64_t, "%ld", (long))
#define VERIFY3U(x,y,z) VERIFY3_IMPL(x, y, z, uint64_t, "%lu", (unsigned long))
#define VERIFY3P(x,y,z) VERIFY3_IMPL(x, y, z, uintptr_t, "%p", (void *))
#define ASSERT3S(x,y,z) VERIFY3S(x, y, z)
#define ASSERT3U(x,y,z) VERIFY3U(x, y, z)
#define ASSERT3P(x,y,z) VERIFY3P(x, y, z)
#define VERIFY(x) ASSERT(x)
#define __CDEBUG(cdls, subsys, mask, format, a...) \
do { \
CHECK_STACK(); \
\
if (((mask) & D_CANTMASK) != 0 || \
((spl_debug_mask & (mask)) != 0 && \
(spl_debug_subsys & (subsys)) != 0)) \
spl_debug_msg(cdls, subsys, mask, \
__FILE__, __FUNCTION__, __LINE__, \
format, ## a); \
} while (0)
#define CDEBUG(mask, format, a...) \
__CDEBUG(NULL, DEBUG_SUBSYSTEM, mask, format, ## a)
#define __CDEBUG_LIMIT(subsys, mask, format, a...) \
do { \
static spl_debug_limit_state_t cdls; \
\
__CDEBUG(&cdls, subsys, mask, format, ## a); \
} while (0)
#define CDEBUG_LIMIT(mask, format, a...) \
__CDEBUG_LIMIT(DEBUG_SUBSYSTEM, mask, format, ## a)
#define CWARN(fmt, a...) CDEBUG_LIMIT(D_WARNING, fmt, ## a)
#define CERROR(fmt, a...) CDEBUG_LIMIT(D_ERROR, fmt, ## a)
#define CEMERG(fmt, a...) CDEBUG_LIMIT(D_EMERG, fmt, ## a)
#define CONSOLE(mask, fmt, a...) CDEBUG(D_CONSOLE | (mask), fmt, ## a)
#define GOTO(label, rc) \
do { \
long GOTO__ret = (long)(rc); \
CDEBUG(D_TRACE,"Process leaving via %s (rc=%lu : %ld : %lx)\n", \
#label, (unsigned long)GOTO__ret, (signed long)GOTO__ret,\
(signed long)GOTO__ret); \
goto label; \
} while (0)
#define RETURN(rc) \
do { \
typeof(rc) RETURN__ret = (rc); \
CDEBUG(D_TRACE, "Process leaving (rc=%lu : %ld : %lx)\n", \
(long)RETURN__ret, (long)RETURN__ret, (long)RETURN__ret);\
return RETURN__ret; \
} while (0)
#define __ENTRY(subsys) \
do { \
__CDEBUG(NULL, subsys, D_TRACE, "Process entered\n"); \
} while (0)
#define __EXIT(subsys) \
do { \
__CDEBUG(NULL, subsys, D_TRACE, "Process leaving\n"); \
} while(0)
#define ENTRY __ENTRY(DEBUG_SUBSYSTEM)
#define EXIT __EXIT(DEBUG_SUBSYSTEM)
#endif /* NDEBUG */
#define spl_debug_msg(cdls, subsys, mask, file, fn, line, format, a...) \
spl_debug_vmsg(cdls, subsys, mask, file, fn, \
line, NULL, NULL, format, ##a)
extern int spl_debug_vmsg(spl_debug_limit_state_t *cdls, int subsys, int mask,
const char *file, const char *fn, const int line,
const char *format1, va_list args, const char *format2, ...);
extern unsigned long spl_debug_set_mask(unsigned long mask);
extern unsigned long spl_debug_get_mask(void);
extern unsigned long spl_debug_set_subsys(unsigned long mask);
extern unsigned long spl_debug_get_subsys(void);
extern int spl_debug_set_mb(int mb);
extern int spl_debug_get_mb(void);
extern int spl_debug_dumplog(int flags);
extern void spl_debug_dumpstack(struct task_struct *tsk);
extern void spl_debug_bug(char *file, const char *func, const int line, int flags);
extern int spl_debug_clear_buffer(void);
extern int spl_debug_mark_buffer(char *text);
#ifdef __cplusplus
}
#endif
#endif /* SPL_DEBUG_H */
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