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linux-stable/include/asm-s390/debug.h
Michael Holzheu 66a464dbc8 [PATCH] s390: debug feature changes 
This patch changes the memory allocation method for the s390 debug feature.
Trace buffers had been allocated using the get_free_pages() function before.
Therefore it was not possible to get big memory areas in a running system due
to memory fragmentation.  Now the trace buffers are subdivided into several
subbuffers with pagesize.  Therefore it is now possible to allocate more
memory for the trace buffers and more trace records can be written.

In addition to that, dynamic specification of the size of the trace buffers is
implemented.  It is now possible to change the size of a trace buffer using a
new debugfs file instance.  When writing a number into this file, the trace
buffer size is changed to 'number * pagesize'.

In the past all the traces could be obtained from userspace by accessing files
in the "proc" filesystem.  Now with debugfs we have a new filesystem which
should be used for debugging purposes.  This patch moves the debug feature
from procfs to debugfs.

Since the interface of debug_register() changed, all device drivers, which use
the debug feature had to be adjusted.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-06-25 16:24:37 -07:00

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/*
* include/asm-s390/debug.h
* S/390 debug facility
*
* Copyright (C) 1999, 2000 IBM Deutschland Entwicklung GmbH,
* IBM Corporation
*/
#ifndef DEBUG_H
#define DEBUG_H
#include <linux/config.h>
#include <linux/fs.h>
#include <linux/string.h>
/* Note:
* struct __debug_entry must be defined outside of #ifdef __KERNEL__
* in order to allow a user program to analyze the 'raw'-view.
*/
struct __debug_entry{
union {
struct {
unsigned long long clock:52;
unsigned long long exception:1;
unsigned long long level:3;
unsigned long long cpuid:8;
} fields;
unsigned long long stck;
} id;
void* caller;
} __attribute__((packed));
#define __DEBUG_FEATURE_VERSION 2 /* version of debug feature */
#ifdef __KERNEL__
#include <linux/spinlock.h>
#include <linux/kernel.h>
#include <linux/time.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 */
#define STCK(x) asm volatile ("STCK 0(%1)" : "=m" (x) : "a" (&(x)) : "cc")
typedef struct __debug_entry debug_entry_t;
struct debug_view;
typedef struct debug_info {
struct debug_info* next;
struct debug_info* prev;
atomic_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];
} 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(char* name, int pages, int nr_areas,
int buf_size);
void debug_unregister(debug_info_t* id);
void debug_set_level(debug_info_t* id, int new_level);
void debug_stop_all(void);
extern 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);
}
extern 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));
}
extern 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));
}
extern 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));
}
extern debug_entry_t *
debug_sprintf_event(debug_info_t* id,int level,char *string,...)
__attribute__ ((format(printf, 3, 4)));
extern 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);
}
extern 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));
}
extern 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));
}
extern 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));
}
extern debug_entry_t *
debug_sprintf_exception(debug_info_t* id,int level,char *string,...)
__attribute__ ((format(printf, 3, 4)));
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 */
#undef DEBUG_MALLOC
#ifdef DEBUG_MALLOC
void *b;
#define kmalloc(x...) (PRINT_INFO(" kmalloc %p\n",b=kmalloc(x)),b)
#define kfree(x) PRINT_INFO(" kfree %p\n",x);kfree(x)
#define get_zeroed_page(x...) (PRINT_INFO(" gfp %p\n",b=get_zeroed_page(x)),b)
#define __get_free_pages(x...) (PRINT_INFO(" gfps %p\n",b=__get_free_pages(x)),b)
#endif /* DEBUG_MALLOC */
#endif /* __KERNEL__ */
#endif /* DEBUG_H */
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