arch/s390/include/asm/debug.h

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