LXR linux/arch/s390/include/asm/debug.h

   1/*
   2 *  include/asm-s390/debug.h
   3 *   S/390 debug facility
   4 *
   5 *    Copyright (C) 1999, 2000 IBM Deutschland Entwicklung GmbH,
   6 *                             IBM Corporation
   7 */
   8
   9#ifndef DEBUG_H
  10#define DEBUG_H
  11
  12#include <linux/fs.h>
  13
  14/* Note:
  15 * struct __debug_entry must be defined outside of #ifdef __KERNEL__ 
  16 * in order to allow a user program to analyze the 'raw'-view.
  17 */
  18
  19struct __debug_entry{
  20        union {
  21                struct {
  22                        unsigned long long clock:52;
  23                        unsigned long long exception:1;
  24                        unsigned long long level:3;
  25                        unsigned long long cpuid:8;
  26                } fields;
  27
  28                unsigned long long stck;
  29        } id;
  30        void* caller;
  31} __attribute__((packed));
  32
  33
  34#define __DEBUG_FEATURE_VERSION      2  /* version of debug feature */
  35
  36#ifdef __KERNEL__
  37#include <linux/string.h>
  38#include <linux/spinlock.h>
  39#include <linux/kernel.h>
  40#include <linux/time.h>
  41
  42#define DEBUG_MAX_LEVEL            6  /* debug levels range from 0 to 6 */
  43#define DEBUG_OFF_LEVEL            -1 /* level where debug is switched off */
  44#define DEBUG_FLUSH_ALL            -1 /* parameter to flush all areas */
  45#define DEBUG_MAX_VIEWS            10 /* max number of views in proc fs */
  46#define DEBUG_MAX_NAME_LEN         64 /* max length for a debugfs file name */
  47#define DEBUG_DEFAULT_LEVEL        3  /* initial debug level */
  48
  49#define DEBUG_DIR_ROOT "s390dbf" /* name of debug root directory in proc fs */
  50
  51#define DEBUG_DATA(entry) (char*)(entry + 1) /* data is stored behind */
  52                                             /* the entry information */
  53
  54typedef struct __debug_entry debug_entry_t;
  55
  56struct debug_view;
  57
  58typedef struct debug_info {     
  59        struct debug_info* next;
  60        struct debug_info* prev;
  61        atomic_t ref_count;
  62        spinlock_t lock;                        
  63        int level;
  64        int nr_areas;
  65        int pages_per_area;
  66        int buf_size;
  67        int entry_size; 
  68        debug_entry_t*** areas;
  69        int active_area;
  70        int *active_pages;
  71        int *active_entries;
  72        struct dentry* debugfs_root_entry;
  73        struct dentry* debugfs_entries[DEBUG_MAX_VIEWS];
  74        struct debug_view* views[DEBUG_MAX_VIEWS];      
  75        char name[DEBUG_MAX_NAME_LEN];
  76        umode_t mode;
  77} debug_info_t;
  78
  79typedef int (debug_header_proc_t) (debug_info_t* id,
  80                                   struct debug_view* view,
  81                                   int area,
  82                                   debug_entry_t* entry,
  83                                   char* out_buf);
  84
  85typedef int (debug_format_proc_t) (debug_info_t* id,
  86                                   struct debug_view* view, char* out_buf,
  87                                   const char* in_buf);
  88typedef int (debug_prolog_proc_t) (debug_info_t* id,
  89                                   struct debug_view* view,
  90                                   char* out_buf);
  91typedef int (debug_input_proc_t) (debug_info_t* id,
  92                                  struct debug_view* view,
  93                                  struct file* file,
  94                                  const char __user *user_buf,
  95                                  size_t in_buf_size, loff_t* offset);
  96
  97int debug_dflt_header_fn(debug_info_t* id, struct debug_view* view,
  98                         int area, debug_entry_t* entry, char* out_buf);                                                
  99                                
 100struct debug_view {
 101        char name[DEBUG_MAX_NAME_LEN];
 102        debug_prolog_proc_t* prolog_proc;
 103        debug_header_proc_t* header_proc;
 104        debug_format_proc_t* format_proc;
 105        debug_input_proc_t*  input_proc;
 106        void*                private_data;
 107};
 108
 109extern struct debug_view debug_hex_ascii_view;
 110extern struct debug_view debug_raw_view;
 111extern struct debug_view debug_sprintf_view;
 112
 113/* do NOT use the _common functions */
 114
 115debug_entry_t* debug_event_common(debug_info_t* id, int level, 
 116                                  const void* data, int length);
 117
 118debug_entry_t* debug_exception_common(debug_info_t* id, int level, 
 119                                      const void* data, int length);
 120
 121/* Debug Feature API: */
 122
 123debug_info_t *debug_register(const char *name, int pages, int nr_areas,
 124                             int buf_size);
 125
 126debug_info_t *debug_register_mode(const char *name, int pages, int nr_areas,
 127                                  int buf_size, umode_t mode, uid_t uid,
 128                                  gid_t gid);
 129
 130void debug_unregister(debug_info_t* id);
 131
 132void debug_set_level(debug_info_t* id, int new_level);
 133
 134void debug_set_critical(void);
 135void debug_stop_all(void);
 136
 137static inline debug_entry_t*
 138debug_event(debug_info_t* id, int level, void* data, int length)
 139{
 140        if ((!id) || (level > id->level) || (id->pages_per_area == 0))
 141                return NULL;
 142        return debug_event_common(id,level,data,length);
 143}
 144
 145static inline debug_entry_t*
 146debug_int_event(debug_info_t* id, int level, unsigned int tag)
 147{
 148        unsigned int t=tag;
 149        if ((!id) || (level > id->level) || (id->pages_per_area == 0))
 150                return NULL;
 151        return debug_event_common(id,level,&t,sizeof(unsigned int));
 152}
 153
 154static inline debug_entry_t *
 155debug_long_event (debug_info_t* id, int level, unsigned long tag)
 156{
 157        unsigned long t=tag;
 158        if ((!id) || (level > id->level) || (id->pages_per_area == 0))
 159                return NULL;
 160        return debug_event_common(id,level,&t,sizeof(unsigned long));
 161}
 162
 163static inline debug_entry_t*
 164debug_text_event(debug_info_t* id, int level, const char* txt)
 165{
 166        if ((!id) || (level > id->level) || (id->pages_per_area == 0))
 167                return NULL;
 168        return debug_event_common(id,level,txt,strlen(txt));
 169}
 170
 171/*
 172 * IMPORTANT: Use "%s" in sprintf format strings with care! Only pointers are
 173 * stored in the s390dbf. See Documentation/s390/s390dbf.txt for more details!
 174 */
 175extern debug_entry_t *
 176debug_sprintf_event(debug_info_t* id,int level,char *string,...)
 177        __attribute__ ((format(printf, 3, 4)));
 178
 179
 180static inline debug_entry_t*
 181debug_exception(debug_info_t* id, int level, void* data, int length)
 182{
 183        if ((!id) || (level > id->level) || (id->pages_per_area == 0))
 184                return NULL;
 185        return debug_exception_common(id,level,data,length);
 186}
 187
 188static inline debug_entry_t*
 189debug_int_exception(debug_info_t* id, int level, unsigned int tag)
 190{
 191        unsigned int t=tag;
 192        if ((!id) || (level > id->level) || (id->pages_per_area == 0))
 193                return NULL;
 194        return debug_exception_common(id,level,&t,sizeof(unsigned int));
 195}
 196
 197static inline debug_entry_t *
 198debug_long_exception (debug_info_t* id, int level, unsigned long tag)
 199{
 200        unsigned long t=tag;
 201        if ((!id) || (level > id->level) || (id->pages_per_area == 0))
 202                return NULL;
 203        return debug_exception_common(id,level,&t,sizeof(unsigned long));
 204}
 205
 206static inline debug_entry_t*
 207debug_text_exception(debug_info_t* id, int level, const char* txt)
 208{
 209        if ((!id) || (level > id->level) || (id->pages_per_area == 0))
 210                return NULL;
 211        return debug_exception_common(id,level,txt,strlen(txt));
 212}
 213
 214/*
 215 * IMPORTANT: Use "%s" in sprintf format strings with care! Only pointers are
 216 * stored in the s390dbf. See Documentation/s390/s390dbf.txt for more details!
 217 */
 218extern debug_entry_t *
 219debug_sprintf_exception(debug_info_t* id,int level,char *string,...)
 220        __attribute__ ((format(printf, 3, 4)));
 221
 222int debug_register_view(debug_info_t* id, struct debug_view* view);
 223int debug_unregister_view(debug_info_t* id, struct debug_view* view);
 224
 225/*
 226   define the debug levels:
 227   - 0 No debugging output to console or syslog
 228   - 1 Log internal errors to syslog, ignore check conditions 
 229   - 2 Log internal errors and check conditions to syslog
 230   - 3 Log internal errors to console, log check conditions to syslog
 231   - 4 Log internal errors and check conditions to console
 232   - 5 panic on internal errors, log check conditions to console
 233   - 6 panic on both, internal errors and check conditions
 234 */
 235
 236#ifndef DEBUG_LEVEL
 237#define DEBUG_LEVEL 4
 238#endif
 239
 240#define INTERNAL_ERRMSG(x,y...) "E" __FILE__ "%d: " x, __LINE__, y
 241#define INTERNAL_WRNMSG(x,y...) "W" __FILE__ "%d: " x, __LINE__, y
 242#define INTERNAL_INFMSG(x,y...) "I" __FILE__ "%d: " x, __LINE__, y
 243#define INTERNAL_DEBMSG(x,y...) "D" __FILE__ "%d: " x, __LINE__, y
 244
 245#if DEBUG_LEVEL > 0
 246#define PRINT_DEBUG(x...) printk ( KERN_DEBUG PRINTK_HEADER x )
 247#define PRINT_INFO(x...) printk ( KERN_INFO PRINTK_HEADER x )
 248#define PRINT_WARN(x...) printk ( KERN_WARNING PRINTK_HEADER x )
 249#define PRINT_ERR(x...) printk ( KERN_ERR PRINTK_HEADER x )
 250#define PRINT_FATAL(x...) panic ( PRINTK_HEADER x )
 251#else
 252#define PRINT_DEBUG(x...) printk ( KERN_DEBUG PRINTK_HEADER x )
 253#define PRINT_INFO(x...) printk ( KERN_DEBUG PRINTK_HEADER x )
 254#define PRINT_WARN(x...) printk ( KERN_DEBUG PRINTK_HEADER x )
 255#define PRINT_ERR(x...) printk ( KERN_DEBUG PRINTK_HEADER x )
 256#define PRINT_FATAL(x...) printk ( KERN_DEBUG PRINTK_HEADER x )
 257#endif                          /* DASD_DEBUG */
 258
 259#endif                          /* __KERNEL__ */
 260#endif                          /* DEBUG_H */
 261