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 void debug_stop_all(void);
 131
 132 extern inline debug_entry_t*
 133 debug_event(debug_info_t* id, int level, void* data, int length)
 134 {
 135         if ((!id) || (level > id->level)) return NULL;
 136         return debug_event_common(id,level,data,length);
 137 }
 138
 139 extern inline debug_entry_t*
 140 debug_int_event(debug_info_t* id, int level, unsigned int tag)
 141 {
 142         unsigned int t=tag;
 143         if ((!id) || (level > id->level)) return NULL;
 144         return debug_event_common(id,level,&t,sizeof(unsigned int));
 145 }
 146
 147 extern inline debug_entry_t *
 148 debug_long_event (debug_info_t* id, int level, unsigned long tag)
 149 {
 150         unsigned long t=tag;
 151         if ((!id) || (level > id->level)) return NULL;
 152         return debug_event_common(id,level,&t,sizeof(unsigned long));
 153 }
 154
 155 extern inline debug_entry_t*
 156 debug_text_event(debug_info_t* id, int level, const char* txt)
 157 {
 158         if ((!id) || (level > id->level)) return NULL;
 159         return debug_event_common(id,level,txt,strlen(txt));
 160 }
 161
 162 extern debug_entry_t *
 163 debug_sprintf_event(debug_info_t* id,int level,char *string,...)
 164         __attribute__ ((format(printf, 3, 4)));
 165
 166
 167 extern inline debug_entry_t*
 168 debug_exception(debug_info_t* id, int level, void* data, int length)
 169 {
 170         if ((!id) || (level > id->level)) return NULL;
 171         return debug_exception_common(id,level,data,length);
 172 }
 173
 174 extern inline debug_entry_t*
 175 debug_int_exception(debug_info_t* id, int level, unsigned int tag)
 176 {
 177         unsigned int t=tag;
 178         if ((!id) || (level > id->level)) return NULL;
 179         return debug_exception_common(id,level,&t,sizeof(unsigned int));
 180 }
 181
 182 extern inline debug_entry_t *
 183 debug_long_exception (debug_info_t* id, int level, unsigned long tag)
 184 {
 185         unsigned long t=tag;
 186         if ((!id) || (level > id->level)) return NULL;
 187         return debug_exception_common(id,level,&t,sizeof(unsigned long));
 188 }
 189
 190 extern inline debug_entry_t*
 191 debug_text_exception(debug_info_t* id, int level, const char* txt)
 192 {
 193         if ((!id) || (level > id->level)) return NULL;
 194         return debug_exception_common(id,level,txt,strlen(txt));
 195 }
 196
 197
 198 extern debug_entry_t *
 199 debug_sprintf_exception(debug_info_t* id,int level,char *string,...)
 200         __attribute__ ((format(printf, 3, 4)));
 201
 202 int debug_register_view(debug_info_t* id, struct debug_view* view);
 203 int debug_unregister_view(debug_info_t* id, struct debug_view* view);
 204
 205 /*
 206    define the debug levels:
 207    - 0 No debugging output to console or syslog
 208    - 1 Log internal errors to syslog, ignore check conditions
 209    - 2 Log internal errors and check conditions to syslog
 210    - 3 Log internal errors to console, log check conditions to syslog
 211    - 4 Log internal errors and check conditions to console
 212    - 5 panic on internal errors, log check conditions to console
 213    - 6 panic on both, internal errors and check conditions
 214  */
 215
 216 #ifndef DEBUG_LEVEL
 217 #define DEBUG_LEVEL 4
 218 #endif
 219
 220 #define INTERNAL_ERRMSG(x,y...) "E" __FILE__ "%d: " x, __LINE__, y
 221 #define INTERNAL_WRNMSG(x,y...) "W" __FILE__ "%d: " x, __LINE__, y
 222 #define INTERNAL_INFMSG(x,y...) "I" __FILE__ "%d: " x, __LINE__, y
 223 #define INTERNAL_DEBMSG(x,y...) "D" __FILE__ "%d: " x, __LINE__, y
 224
 225 #if DEBUG_LEVEL > 0
 226 #define PRINT_DEBUG(x...) printk ( KERN_DEBUG PRINTK_HEADER x )
 227 #define PRINT_INFO(x...) printk ( KERN_INFO PRINTK_HEADER x )
 228 #define PRINT_WARN(x...) printk ( KERN_WARNING PRINTK_HEADER x )
 229 #define PRINT_ERR(x...) printk ( KERN_ERR PRINTK_HEADER x )
 230 #define PRINT_FATAL(x...) panic ( PRINTK_HEADER x )
 231 #else
 232 #define PRINT_DEBUG(x...) printk ( KERN_DEBUG PRINTK_HEADER x )
 233 #define PRINT_INFO(x...) printk ( KERN_DEBUG PRINTK_HEADER x )
 234 #define PRINT_WARN(x...) printk ( KERN_DEBUG PRINTK_HEADER x )
 235 #define PRINT_ERR(x...) printk ( KERN_DEBUG PRINTK_HEADER x )
 236 #define PRINT_FATAL(x...) printk ( KERN_DEBUG PRINTK_HEADER x )
 237 #endif                          /* DASD_DEBUG */
 238
 239 #undef DEBUG_MALLOC
 240 #ifdef DEBUG_MALLOC
 241 void *b;
 242 #define kmalloc(x...) (PRINT_INFO(" kmalloc %p\n",b=kmalloc(x)),b)
 243 #define kfree(x) PRINT_INFO(" kfree %p\n",x);kfree(x)
 244 #define get_zeroed_page(x...) (PRINT_INFO(" gfp %p\n",b=get_zeroed_page(x)),b)
 245 #define __get_free_pages(x...) (PRINT_INFO(" gfps %p\n",b=__get_free_pages(x)),b)
 246 #endif                          /* DEBUG_MALLOC */
 247
 248 #endif                          /* __KERNEL__ */
 249 #endif                          /* DEBUG_H */