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
  19 struct __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
  54 typedef struct __debug_entry debug_entry_t;
  55
  56 struct debug_view;
  57
  58 typedef 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
  79 typedef 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
  85 typedef int (debug_format_proc_t) (debug_info_t* id,
  86                                    struct debug_view* view, char* out_buf,
  87                                    const char* in_buf);
  88 typedef int (debug_prolog_proc_t) (debug_info_t* id,
  89                                    struct debug_view* view,
  90                                    char* out_buf);
  91 typedef 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
  97 int debug_dflt_header_fn(debug_info_t* id, struct debug_view* view,
  98                          int area, debug_entry_t* entry, char* out_buf);
  99
 100 struct 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
 109 extern struct debug_view debug_hex_ascii_view;
 110 extern struct debug_view debug_raw_view;
 111 extern struct debug_view debug_sprintf_view;
 112
 113 /* do NOT use the _common functions */
 114
 115 debug_entry_t* debug_event_common(debug_info_t* id, int level,
 116                                   const void* data, int length);
 117
 118 debug_entry_t* debug_exception_common(debug_info_t* id, int level,
 119                                       const void* data, int length);
 120
 121 /* Debug Feature API: */
 122
 123 debug_info_t *debug_register(const char *name, int pages, int nr_areas,
 124                              int buf_size);
 125
 126 debug_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
 130 void debug_unregister(debug_info_t* id);
 131
 132 void debug_set_level(debug_info_t* id, int new_level);
 133
 134 void debug_stop_all(void);
 135
 136 static inline debug_entry_t*
 137 debug_event(debug_info_t* id, int level, void* data, int length)
 138 {
 139         if ((!id) || (level > id->level) || (id->pages_per_area == 0))
 140                 return NULL;
 141         return debug_event_common(id,level,data,length);
 142 }
 143
 144 static inline debug_entry_t*
 145 debug_int_event(debug_info_t* id, int level, unsigned int tag)
 146 {
 147         unsigned int t=tag;
 148         if ((!id) || (level > id->level) || (id->pages_per_area == 0))
 149                 return NULL;
 150         return debug_event_common(id,level,&t,sizeof(unsigned int));
 151 }
 152
 153 static inline debug_entry_t *
 154 debug_long_event (debug_info_t* id, int level, unsigned long tag)
 155 {
 156         unsigned long t=tag;
 157         if ((!id) || (level > id->level) || (id->pages_per_area == 0))
 158                 return NULL;
 159         return debug_event_common(id,level,&t,sizeof(unsigned long));
 160 }
 161
 162 static inline debug_entry_t*
 163 debug_text_event(debug_info_t* id, int level, const char* txt)
 164 {
 165         if ((!id) || (level > id->level) || (id->pages_per_area == 0))
 166                 return NULL;
 167         return debug_event_common(id,level,txt,strlen(txt));
 168 }
 169
 170 /*
 171  * IMPORTANT: Use "%s" in sprintf format strings with care! Only pointers are
 172  * stored in the s390dbf. See Documentation/s390/s390dbf.txt for more details!
 173  */
 174 extern debug_entry_t *
 175 debug_sprintf_event(debug_info_t* id,int level,char *string,...)
 176         __attribute__ ((format(printf, 3, 4)));
 177
 178
 179 static inline debug_entry_t*
 180 debug_exception(debug_info_t* id, int level, void* data, int length)
 181 {
 182         if ((!id) || (level > id->level) || (id->pages_per_area == 0))
 183                 return NULL;
 184         return debug_exception_common(id,level,data,length);
 185 }
 186
 187 static inline debug_entry_t*
 188 debug_int_exception(debug_info_t* id, int level, unsigned int tag)
 189 {
 190         unsigned int t=tag;
 191         if ((!id) || (level > id->level) || (id->pages_per_area == 0))
 192                 return NULL;
 193         return debug_exception_common(id,level,&t,sizeof(unsigned int));
 194 }
 195
 196 static inline debug_entry_t *
 197 debug_long_exception (debug_info_t* id, int level, unsigned long tag)
 198 {
 199         unsigned long t=tag;
 200         if ((!id) || (level > id->level) || (id->pages_per_area == 0))
 201                 return NULL;
 202         return debug_exception_common(id,level,&t,sizeof(unsigned long));
 203 }
 204
 205 static inline debug_entry_t*
 206 debug_text_exception(debug_info_t* id, int level, const char* txt)
 207 {
 208         if ((!id) || (level > id->level) || (id->pages_per_area == 0))
 209                 return NULL;
 210         return debug_exception_common(id,level,txt,strlen(txt));
 211 }
 212
 213 /*
 214  * IMPORTANT: Use "%s" in sprintf format strings with care! Only pointers are
 215  * stored in the s390dbf. See Documentation/s390/s390dbf.txt for more details!
 216  */
 217 extern debug_entry_t *
 218 debug_sprintf_exception(debug_info_t* id,int level,char *string,...)
 219         __attribute__ ((format(printf, 3, 4)));
 220
 221 int debug_register_view(debug_info_t* id, struct debug_view* view);
 222 int debug_unregister_view(debug_info_t* id, struct debug_view* view);
 223
 224 /*
 225    define the debug levels:
 226    - 0 No debugging output to console or syslog
 227    - 1 Log internal errors to syslog, ignore check conditions
 228    - 2 Log internal errors and check conditions to syslog
 229    - 3 Log internal errors to console, log check conditions to syslog
 230    - 4 Log internal errors and check conditions to console
 231    - 5 panic on internal errors, log check conditions to console
 232    - 6 panic on both, internal errors and check conditions
 233  */
 234
 235 #ifndef DEBUG_LEVEL
 236 #define DEBUG_LEVEL 4
 237 #endif
 238
 239 #define INTERNAL_ERRMSG(x,y...) "E" __FILE__ "%d: " x, __LINE__, y
 240 #define INTERNAL_WRNMSG(x,y...) "W" __FILE__ "%d: " x, __LINE__, y
 241 #define INTERNAL_INFMSG(x,y...) "I" __FILE__ "%d: " x, __LINE__, y
 242 #define INTERNAL_DEBMSG(x,y...) "D" __FILE__ "%d: " x, __LINE__, y
 243
 244 #if DEBUG_LEVEL > 0
 245 #define PRINT_DEBUG(x...) printk ( KERN_DEBUG PRINTK_HEADER x )
 246 #define PRINT_INFO(x...) printk ( KERN_INFO PRINTK_HEADER x )
 247 #define PRINT_WARN(x...) printk ( KERN_WARNING PRINTK_HEADER x )
 248 #define PRINT_ERR(x...) printk ( KERN_ERR PRINTK_HEADER x )
 249 #define PRINT_FATAL(x...) panic ( PRINTK_HEADER x )
 250 #else
 251 #define PRINT_DEBUG(x...) printk ( KERN_DEBUG PRINTK_HEADER x )
 252 #define PRINT_INFO(x...) printk ( KERN_DEBUG PRINTK_HEADER x )
 253 #define PRINT_WARN(x...) printk ( KERN_DEBUG PRINTK_HEADER x )
 254 #define PRINT_ERR(x...) printk ( KERN_DEBUG PRINTK_HEADER x )
 255 #define PRINT_FATAL(x...) printk ( KERN_DEBUG PRINTK_HEADER x )
 256 #endif                          /* DASD_DEBUG */
 257
 258 #endif                          /* __KERNEL__ */
 259 #endif                          /* DEBUG_H */