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/string.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      1  /* version of debug feature */
  35
  36 #ifdef __KERNEL__
  37 #include <linux/spinlock.h>
  38 #include <linux/kernel.h>
  39 #include <linux/time.h>
  40 #include <linux/proc_fs.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_PROCF_LEN        16 /* max length for a proc 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 #define STCK(x) asm volatile ("STCK 0(%1)" : "=m" (x) : "a" (&(x)) : "cc")
  55
  56 typedef struct __debug_entry debug_entry_t;
  57
  58 struct debug_view;
  59
  60 typedef struct debug_info {
  61         struct debug_info* next;
  62         struct debug_info* prev;
  63         atomic_t ref_count;
  64         spinlock_t lock;
  65         int level;
  66         int nr_areas;
  67         int page_order;
  68         int buf_size;
  69         int entry_size;
  70         debug_entry_t** areas;
  71         int active_area;
  72         int *active_entry;
  73         struct proc_dir_entry* proc_root_entry;
  74         struct proc_dir_entry* proc_entries[DEBUG_MAX_VIEWS];
  75         struct debug_view* views[DEBUG_MAX_VIEWS];
  76         char name[DEBUG_MAX_PROCF_LEN];
  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_PROCF_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(char* name, int pages_index, int nr_areas,
 124                              int buf_size);
 125
 126 void debug_unregister(debug_info_t* id);
 127
 128 void debug_set_level(debug_info_t* id, int new_level);
 129
 130 extern inline debug_entry_t*
 131 debug_event(debug_info_t* id, int level, void* data, int length)
 132 {
 133         if ((!id) || (level > id->level)) return NULL;
 134         return debug_event_common(id,level,data,length);
 135 }
 136
 137 extern inline debug_entry_t*
 138 debug_int_event(debug_info_t* id, int level, unsigned int tag)
 139 {
 140         unsigned int t=tag;
 141         if ((!id) || (level > id->level)) return NULL;
 142         return debug_event_common(id,level,&t,sizeof(unsigned int));
 143 }
 144
 145 extern inline debug_entry_t *
 146 debug_long_event (debug_info_t* id, int level, unsigned long tag)
 147 {
 148         unsigned long t=tag;
 149         if ((!id) || (level > id->level)) return NULL;
 150         return debug_event_common(id,level,&t,sizeof(unsigned long));
 151 }
 152
 153 extern inline debug_entry_t*
 154 debug_text_event(debug_info_t* id, int level, const char* txt)
 155 {
 156         if ((!id) || (level > id->level)) return NULL;
 157         return debug_event_common(id,level,txt,strlen(txt));
 158 }
 159
 160 extern debug_entry_t *
 161 debug_sprintf_event(debug_info_t* id,int level,char *string,...)
 162         __attribute__ ((format(printf, 3, 4)));
 163
 164
 165 extern inline debug_entry_t*
 166 debug_exception(debug_info_t* id, int level, void* data, int length)
 167 {
 168         if ((!id) || (level > id->level)) return NULL;
 169         return debug_exception_common(id,level,data,length);
 170 }
 171
 172 extern inline debug_entry_t*
 173 debug_int_exception(debug_info_t* id, int level, unsigned int tag)
 174 {
 175         unsigned int t=tag;
 176         if ((!id) || (level > id->level)) return NULL;
 177         return debug_exception_common(id,level,&t,sizeof(unsigned int));
 178 }
 179
 180 extern inline debug_entry_t *
 181 debug_long_exception (debug_info_t* id, int level, unsigned long tag)
 182 {
 183         unsigned long t=tag;
 184         if ((!id) || (level > id->level)) return NULL;
 185         return debug_exception_common(id,level,&t,sizeof(unsigned long));
 186 }
 187
 188 extern inline debug_entry_t*
 189 debug_text_exception(debug_info_t* id, int level, const char* txt)
 190 {
 191         if ((!id) || (level > id->level)) return NULL;
 192         return debug_exception_common(id,level,txt,strlen(txt));
 193 }
 194
 195
 196 extern debug_entry_t *
 197 debug_sprintf_exception(debug_info_t* id,int level,char *string,...)
 198         __attribute__ ((format(printf, 3, 4)));
 199
 200 int debug_register_view(debug_info_t* id, struct debug_view* view);
 201 int debug_unregister_view(debug_info_t* id, struct debug_view* view);
 202
 203 /*
 204    define the debug levels:
 205    - 0 No debugging output to console or syslog
 206    - 1 Log internal errors to syslog, ignore check conditions
 207    - 2 Log internal errors and check conditions to syslog
 208    - 3 Log internal errors to console, log check conditions to syslog
 209    - 4 Log internal errors and check conditions to console
 210    - 5 panic on internal errors, log check conditions to console
 211    - 6 panic on both, internal errors and check conditions
 212  */
 213
 214 #ifndef DEBUG_LEVEL
 215 #define DEBUG_LEVEL 4
 216 #endif
 217
 218 #define INTERNAL_ERRMSG(x,y...) "E" __FILE__ "%d: " x, __LINE__, y
 219 #define INTERNAL_WRNMSG(x,y...) "W" __FILE__ "%d: " x, __LINE__, y
 220 #define INTERNAL_INFMSG(x,y...) "I" __FILE__ "%d: " x, __LINE__, y
 221 #define INTERNAL_DEBMSG(x,y...) "D" __FILE__ "%d: " x, __LINE__, y
 222
 223 #if DEBUG_LEVEL > 0
 224 #define PRINT_DEBUG(x...) printk ( KERN_DEBUG PRINTK_HEADER x )
 225 #define PRINT_INFO(x...) printk ( KERN_INFO PRINTK_HEADER x )
 226 #define PRINT_WARN(x...) printk ( KERN_WARNING PRINTK_HEADER x )
 227 #define PRINT_ERR(x...) printk ( KERN_ERR PRINTK_HEADER x )
 228 #define PRINT_FATAL(x...) panic ( PRINTK_HEADER x )
 229 #else
 230 #define PRINT_DEBUG(x...) printk ( KERN_DEBUG PRINTK_HEADER x )
 231 #define PRINT_INFO(x...) printk ( KERN_DEBUG PRINTK_HEADER x )
 232 #define PRINT_WARN(x...) printk ( KERN_DEBUG PRINTK_HEADER x )
 233 #define PRINT_ERR(x...) printk ( KERN_DEBUG PRINTK_HEADER x )
 234 #define PRINT_FATAL(x...) printk ( KERN_DEBUG PRINTK_HEADER x )
 235 #endif                          /* DASD_DEBUG */
 236
 237 #undef DEBUG_MALLOC
 238 #ifdef DEBUG_MALLOC
 239 void *b;
 240 #define kmalloc(x...) (PRINT_INFO(" kmalloc %p\n",b=kmalloc(x)),b)
 241 #define kfree(x) PRINT_INFO(" kfree %p\n",x);kfree(x)
 242 #define get_zeroed_page(x...) (PRINT_INFO(" gfp %p\n",b=get_zeroed_page(x)),b)
 243 #define __get_free_pages(x...) (PRINT_INFO(" gfps %p\n",b=__get_free_pages(x)),b)
 244 #endif                          /* DEBUG_MALLOC */
 245
 246 #endif                          /* __KERNEL__ */
 247 #endif                          /* DEBUG_H */