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