mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-14 04:26:45 +00:00
0328e519a7
For non-static-inlines, debug.c already had non-compliant function
header docs. So move the pure prototype kdocs of
("s390: include/asm/debug.h add kerneldoc markups")
from debug.h to debug.c and merge them with the old function docs.
Also, I had the impression that kdoc typically is at the implementation
in the compile unit rather than at the prototype in the header file.
While at it, update the short kdoc description to distinguish the
different functions. And a few more consistency cleanups.
Added a new kdoc for debug_set_critical() since debug.h comments it
as part of the API.
Signed-off-by: Steffen Maier <maier@linux.ibm.com>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Message-Id: <1562149189-1417-3-git-send-email-maier@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
419 lines
12 KiB
C
419 lines
12 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* S/390 debug facility
|
|
*
|
|
* Copyright IBM Corp. 1999, 2000
|
|
*/
|
|
#ifndef DEBUG_H
|
|
#define DEBUG_H
|
|
|
|
#include <linux/string.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/time.h>
|
|
#include <linux/refcount.h>
|
|
#include <uapi/asm/debug.h>
|
|
|
|
#define DEBUG_MAX_LEVEL 6 /* debug levels range from 0 to 6 */
|
|
#define DEBUG_OFF_LEVEL -1 /* level where debug is switched off */
|
|
#define DEBUG_FLUSH_ALL -1 /* parameter to flush all areas */
|
|
#define DEBUG_MAX_VIEWS 10 /* max number of views in proc fs */
|
|
#define DEBUG_MAX_NAME_LEN 64 /* max length for a debugfs file name */
|
|
#define DEBUG_DEFAULT_LEVEL 3 /* initial debug level */
|
|
|
|
#define DEBUG_DIR_ROOT "s390dbf" /* name of debug root directory in proc fs */
|
|
|
|
#define DEBUG_DATA(entry) (char *)(entry + 1) /* data is stored behind */
|
|
/* the entry information */
|
|
|
|
typedef struct __debug_entry debug_entry_t;
|
|
|
|
struct debug_view;
|
|
|
|
typedef struct debug_info {
|
|
struct debug_info *next;
|
|
struct debug_info *prev;
|
|
refcount_t ref_count;
|
|
spinlock_t lock;
|
|
int level;
|
|
int nr_areas;
|
|
int pages_per_area;
|
|
int buf_size;
|
|
int entry_size;
|
|
debug_entry_t ***areas;
|
|
int active_area;
|
|
int *active_pages;
|
|
int *active_entries;
|
|
struct dentry *debugfs_root_entry;
|
|
struct dentry *debugfs_entries[DEBUG_MAX_VIEWS];
|
|
struct debug_view *views[DEBUG_MAX_VIEWS];
|
|
char name[DEBUG_MAX_NAME_LEN];
|
|
umode_t mode;
|
|
} debug_info_t;
|
|
|
|
typedef int (debug_header_proc_t) (debug_info_t *id,
|
|
struct debug_view *view,
|
|
int area,
|
|
debug_entry_t *entry,
|
|
char *out_buf);
|
|
|
|
typedef int (debug_format_proc_t) (debug_info_t *id,
|
|
struct debug_view *view, char *out_buf,
|
|
const char *in_buf);
|
|
typedef int (debug_prolog_proc_t) (debug_info_t *id,
|
|
struct debug_view *view,
|
|
char *out_buf);
|
|
typedef int (debug_input_proc_t) (debug_info_t *id,
|
|
struct debug_view *view,
|
|
struct file *file,
|
|
const char __user *user_buf,
|
|
size_t in_buf_size, loff_t *offset);
|
|
|
|
int debug_dflt_header_fn(debug_info_t *id, struct debug_view *view,
|
|
int area, debug_entry_t *entry, char *out_buf);
|
|
|
|
struct debug_view {
|
|
char name[DEBUG_MAX_NAME_LEN];
|
|
debug_prolog_proc_t *prolog_proc;
|
|
debug_header_proc_t *header_proc;
|
|
debug_format_proc_t *format_proc;
|
|
debug_input_proc_t *input_proc;
|
|
void *private_data;
|
|
};
|
|
|
|
extern struct debug_view debug_hex_ascii_view;
|
|
extern struct debug_view debug_raw_view;
|
|
extern struct debug_view debug_sprintf_view;
|
|
|
|
/* do NOT use the _common functions */
|
|
|
|
debug_entry_t *debug_event_common(debug_info_t *id, int level,
|
|
const void *data, int length);
|
|
|
|
debug_entry_t *debug_exception_common(debug_info_t *id, int level,
|
|
const void *data, int length);
|
|
|
|
/* Debug Feature API: */
|
|
|
|
debug_info_t *debug_register(const char *name, int pages, int nr_areas,
|
|
int buf_size);
|
|
|
|
debug_info_t *debug_register_mode(const char *name, int pages, int nr_areas,
|
|
int buf_size, umode_t mode, uid_t uid,
|
|
gid_t gid);
|
|
|
|
void debug_unregister(debug_info_t *id);
|
|
|
|
void debug_set_level(debug_info_t *id, int new_level);
|
|
|
|
void debug_set_critical(void);
|
|
|
|
void debug_stop_all(void);
|
|
|
|
/**
|
|
* debug_level_enabled() - Returns true if debug events for the specified
|
|
* level would be logged. Otherwise returns false.
|
|
*
|
|
* @id: handle for debug log
|
|
* @level: debug level
|
|
*
|
|
* Return:
|
|
* - %true if level is less or equal to the current debug level.
|
|
*/
|
|
static inline bool debug_level_enabled(debug_info_t *id, int level)
|
|
{
|
|
return level <= id->level;
|
|
}
|
|
|
|
/**
|
|
* debug_event() - writes binary debug entry to active debug area
|
|
* (if level <= actual debug level)
|
|
*
|
|
* @id: handle for debug log
|
|
* @level: debug level
|
|
* @data: pointer to data for debug entry
|
|
* @length: length of data in bytes
|
|
*
|
|
* Return:
|
|
* - Address of written debug entry
|
|
* - %NULL if error
|
|
*/
|
|
static inline debug_entry_t *debug_event(debug_info_t *id, int level,
|
|
void *data, int length)
|
|
{
|
|
if ((!id) || (level > id->level) || (id->pages_per_area == 0))
|
|
return NULL;
|
|
return debug_event_common(id, level, data, length);
|
|
}
|
|
|
|
/**
|
|
* debug_int_event() - writes unsigned integer debug entry to active debug area
|
|
* (if level <= actual debug level)
|
|
*
|
|
* @id: handle for debug log
|
|
* @level: debug level
|
|
* @tag: integer value for debug entry
|
|
*
|
|
* Return:
|
|
* - Address of written debug entry
|
|
* - %NULL if error
|
|
*/
|
|
static inline debug_entry_t *debug_int_event(debug_info_t *id, int level,
|
|
unsigned int tag)
|
|
{
|
|
unsigned int t = tag;
|
|
|
|
if ((!id) || (level > id->level) || (id->pages_per_area == 0))
|
|
return NULL;
|
|
return debug_event_common(id, level, &t, sizeof(unsigned int));
|
|
}
|
|
|
|
/**
|
|
* debug_long_event() - writes unsigned long debug entry to active debug area
|
|
* (if level <= actual debug level)
|
|
*
|
|
* @id: handle for debug log
|
|
* @level: debug level
|
|
* @tag: long integer value for debug entry
|
|
*
|
|
* Return:
|
|
* - Address of written debug entry
|
|
* - %NULL if error
|
|
*/
|
|
static inline debug_entry_t *debug_long_event(debug_info_t *id, int level,
|
|
unsigned long tag)
|
|
{
|
|
unsigned long t = tag;
|
|
|
|
if ((!id) || (level > id->level) || (id->pages_per_area == 0))
|
|
return NULL;
|
|
return debug_event_common(id, level, &t, sizeof(unsigned long));
|
|
}
|
|
|
|
/**
|
|
* debug_text_event() - writes string debug entry in ascii format to active
|
|
* debug area (if level <= actual debug level)
|
|
*
|
|
* @id: handle for debug log
|
|
* @level: debug level
|
|
* @txt: string for debug entry
|
|
*
|
|
* Return:
|
|
* - Address of written debug entry
|
|
* - %NULL if error
|
|
*/
|
|
static inline debug_entry_t *debug_text_event(debug_info_t *id, int level,
|
|
const char *txt)
|
|
{
|
|
if ((!id) || (level > id->level) || (id->pages_per_area == 0))
|
|
return NULL;
|
|
return debug_event_common(id, level, txt, strlen(txt));
|
|
}
|
|
|
|
/*
|
|
* IMPORTANT: Use "%s" in sprintf format strings with care! Only pointers are
|
|
* stored in the s390dbf. See Documentation/s390/s390dbf.rst for more details!
|
|
*/
|
|
extern debug_entry_t *
|
|
__debug_sprintf_event(debug_info_t *id, int level, char *string, ...)
|
|
__attribute__ ((format(printf, 3, 4)));
|
|
|
|
/**
|
|
* debug_sprintf_event() - writes debug entry with format string
|
|
* and varargs (longs) to active debug area
|
|
* (if level $<=$ actual debug level).
|
|
*
|
|
* @_id: handle for debug log
|
|
* @_level: debug level
|
|
* @_fmt: format string for debug entry
|
|
* @...: varargs used as in sprintf()
|
|
*
|
|
* Return:
|
|
* - Address of written debug entry
|
|
* - %NULL if error
|
|
*
|
|
* floats and long long datatypes cannot be used as varargs.
|
|
*/
|
|
#define debug_sprintf_event(_id, _level, _fmt, ...) \
|
|
({ \
|
|
debug_entry_t *__ret; \
|
|
debug_info_t *__id = _id; \
|
|
int __level = _level; \
|
|
\
|
|
if ((!__id) || (__level > __id->level)) \
|
|
__ret = NULL; \
|
|
else \
|
|
__ret = __debug_sprintf_event(__id, __level, \
|
|
_fmt, ## __VA_ARGS__); \
|
|
__ret; \
|
|
})
|
|
|
|
/**
|
|
* debug_exception() - writes binary debug entry to active debug area
|
|
* (if level <= actual debug level)
|
|
* and switches to next debug area
|
|
*
|
|
* @id: handle for debug log
|
|
* @level: debug level
|
|
* @data: pointer to data for debug entry
|
|
* @length: length of data in bytes
|
|
*
|
|
* Return:
|
|
* - Address of written debug entry
|
|
* - %NULL if error
|
|
*/
|
|
static inline debug_entry_t *debug_exception(debug_info_t *id, int level,
|
|
void *data, int length)
|
|
{
|
|
if ((!id) || (level > id->level) || (id->pages_per_area == 0))
|
|
return NULL;
|
|
return debug_exception_common(id, level, data, length);
|
|
}
|
|
|
|
/**
|
|
* debug_int_exception() - writes unsigned int debug entry to active debug area
|
|
* (if level <= actual debug level)
|
|
* and switches to next debug area
|
|
*
|
|
* @id: handle for debug log
|
|
* @level: debug level
|
|
* @tag: integer value for debug entry
|
|
*
|
|
* Return:
|
|
* - Address of written debug entry
|
|
* - %NULL if error
|
|
*/
|
|
static inline debug_entry_t *debug_int_exception(debug_info_t *id, int level,
|
|
unsigned int tag)
|
|
{
|
|
unsigned int t = tag;
|
|
|
|
if ((!id) || (level > id->level) || (id->pages_per_area == 0))
|
|
return NULL;
|
|
return debug_exception_common(id, level, &t, sizeof(unsigned int));
|
|
}
|
|
|
|
/**
|
|
* debug_long_exception() - writes long debug entry to active debug area
|
|
* (if level <= actual debug level)
|
|
* and switches to next debug area
|
|
*
|
|
* @id: handle for debug log
|
|
* @level: debug level
|
|
* @tag: long integer value for debug entry
|
|
*
|
|
* Return:
|
|
* - Address of written debug entry
|
|
* - %NULL if error
|
|
*/
|
|
static inline debug_entry_t *debug_long_exception (debug_info_t *id, int level,
|
|
unsigned long tag)
|
|
{
|
|
unsigned long t = tag;
|
|
|
|
if ((!id) || (level > id->level) || (id->pages_per_area == 0))
|
|
return NULL;
|
|
return debug_exception_common(id, level, &t, sizeof(unsigned long));
|
|
}
|
|
|
|
/**
|
|
* debug_text_exception() - writes string debug entry in ascii format to active
|
|
* debug area (if level <= actual debug level)
|
|
* and switches to next debug area
|
|
* area
|
|
*
|
|
* @id: handle for debug log
|
|
* @level: debug level
|
|
* @txt: string for debug entry
|
|
*
|
|
* Return:
|
|
* - Address of written debug entry
|
|
* - %NULL if error
|
|
*/
|
|
static inline debug_entry_t *debug_text_exception(debug_info_t *id, int level,
|
|
const char *txt)
|
|
{
|
|
if ((!id) || (level > id->level) || (id->pages_per_area == 0))
|
|
return NULL;
|
|
return debug_exception_common(id, level, txt, strlen(txt));
|
|
}
|
|
|
|
/*
|
|
* IMPORTANT: Use "%s" in sprintf format strings with care! Only pointers are
|
|
* stored in the s390dbf. See Documentation/s390/s390dbf.rst for more details!
|
|
*/
|
|
extern debug_entry_t *
|
|
__debug_sprintf_exception(debug_info_t *id, int level, char *string, ...)
|
|
__attribute__ ((format(printf, 3, 4)));
|
|
|
|
|
|
/**
|
|
* debug_sprintf_exception() - writes debug entry with format string and
|
|
* varargs (longs) to active debug area
|
|
* (if level <= actual debug level)
|
|
* and switches to next debug area.
|
|
*
|
|
* @_id: handle for debug log
|
|
* @_level: debug level
|
|
* @_fmt: format string for debug entry
|
|
* @...: varargs used as in sprintf()
|
|
*
|
|
* Return:
|
|
* - Address of written debug entry
|
|
* - %NULL if error
|
|
*
|
|
* floats and long long datatypes cannot be used as varargs.
|
|
*/
|
|
#define debug_sprintf_exception(_id, _level, _fmt, ...) \
|
|
({ \
|
|
debug_entry_t *__ret; \
|
|
debug_info_t *__id = _id; \
|
|
int __level = _level; \
|
|
\
|
|
if ((!__id) || (__level > __id->level)) \
|
|
__ret = NULL; \
|
|
else \
|
|
__ret = __debug_sprintf_exception(__id, __level, \
|
|
_fmt, ## __VA_ARGS__);\
|
|
__ret; \
|
|
})
|
|
|
|
int debug_register_view(debug_info_t *id, struct debug_view *view);
|
|
|
|
int debug_unregister_view(debug_info_t *id, struct debug_view *view);
|
|
|
|
/*
|
|
define the debug levels:
|
|
- 0 No debugging output to console or syslog
|
|
- 1 Log internal errors to syslog, ignore check conditions
|
|
- 2 Log internal errors and check conditions to syslog
|
|
- 3 Log internal errors to console, log check conditions to syslog
|
|
- 4 Log internal errors and check conditions to console
|
|
- 5 panic on internal errors, log check conditions to console
|
|
- 6 panic on both, internal errors and check conditions
|
|
*/
|
|
|
|
#ifndef DEBUG_LEVEL
|
|
#define DEBUG_LEVEL 4
|
|
#endif
|
|
|
|
#define INTERNAL_ERRMSG(x,y...) "E" __FILE__ "%d: " x, __LINE__, y
|
|
#define INTERNAL_WRNMSG(x,y...) "W" __FILE__ "%d: " x, __LINE__, y
|
|
#define INTERNAL_INFMSG(x,y...) "I" __FILE__ "%d: " x, __LINE__, y
|
|
#define INTERNAL_DEBMSG(x,y...) "D" __FILE__ "%d: " x, __LINE__, y
|
|
|
|
#if DEBUG_LEVEL > 0
|
|
#define PRINT_DEBUG(x...) printk(KERN_DEBUG PRINTK_HEADER x)
|
|
#define PRINT_INFO(x...) printk(KERN_INFO PRINTK_HEADER x)
|
|
#define PRINT_WARN(x...) printk(KERN_WARNING PRINTK_HEADER x)
|
|
#define PRINT_ERR(x...) printk(KERN_ERR PRINTK_HEADER x)
|
|
#define PRINT_FATAL(x...) panic(PRINTK_HEADER x)
|
|
#else
|
|
#define PRINT_DEBUG(x...) printk(KERN_DEBUG PRINTK_HEADER x)
|
|
#define PRINT_INFO(x...) printk(KERN_DEBUG PRINTK_HEADER x)
|
|
#define PRINT_WARN(x...) printk(KERN_DEBUG PRINTK_HEADER x)
|
|
#define PRINT_ERR(x...) printk(KERN_DEBUG PRINTK_HEADER x)
|
|
#define PRINT_FATAL(x...) printk(KERN_DEBUG PRINTK_HEADER x)
|
|
#endif /* DASD_DEBUG */
|
|
|
|
#endif /* DEBUG_H */
|