include/linux/vserver/history.h

   1 #ifndef _VX_HISTORY_H
   2 #define _VX_HISTORY_H
   3
   4
   5 enum {
   6         VXH_UNUSED=0,
   7         VXH_THROW_OOPS=1,
   8
   9         VXH_GET_VX_INFO,
  10         VXH_PUT_VX_INFO,
  11         VXH_INIT_VX_INFO,
  12         VXH_SET_VX_INFO,
  13         VXH_CLR_VX_INFO,
  14         VXH_CLAIM_VX_INFO,
  15         VXH_RELEASE_VX_INFO,
  16         VXH_ALLOC_VX_INFO,
  17         VXH_DEALLOC_VX_INFO,
  18         VXH_HASH_VX_INFO,
  19         VXH_UNHASH_VX_INFO,
  20         VXH_LOC_VX_INFO,
  21         VXH_LOOKUP_VX_INFO,
  22         VXH_CREATE_VX_INFO,
  23 };
  24
  25 struct _vxhe_vxi {
  26         struct vx_info *ptr;
  27         unsigned xid;
  28         unsigned usecnt;
  29         unsigned tasks;
  30 };
  31
  32 struct _vxhe_set_clr {
  33         void *data;
  34 };
  35
  36 struct _vxhe_loc_lookup {
  37         unsigned arg;
  38 };
  39
  40 struct _vx_hist_entry {
  41         void *loc;
  42         unsigned short seq;
  43         unsigned short type;
  44         struct _vxhe_vxi vxi;
  45         union {
  46                 struct _vxhe_set_clr sc;
  47                 struct _vxhe_loc_lookup ll;
  48         };
  49 };
  50
  51 #ifdef  CONFIG_VSERVER_HISTORY
  52
  53 extern unsigned volatile int vxh_active;
  54
  55 struct _vx_hist_entry *vxh_advance(void *loc);
  56
  57
  58 static inline
  59 void    __vxh_copy_vxi(struct _vx_hist_entry *entry, struct vx_info *vxi)
  60 {
  61         entry->vxi.ptr = vxi;
  62         if (vxi) {
  63                 entry->vxi.usecnt = atomic_read(&vxi->vx_usecnt);
  64                 entry->vxi.tasks = atomic_read(&vxi->vx_tasks);
  65                 entry->vxi.xid = vxi->vx_id;
  66         }
  67 }
  68
  69
  70 #define __HERE__ current_text_addr()
  71
  72 #define __VXH_BODY(__type, __data, __here)      \
  73         struct _vx_hist_entry *entry;           \
  74                                                 \
  75         preempt_disable();                      \
  76         entry = vxh_advance(__here);            \
  77         __data;                                 \
  78         entry->type = __type;                   \
  79         preempt_enable();
  80
  81
  82         /* pass vxi only */
  83
  84 #define __VXH_SMPL                              \
  85         __vxh_copy_vxi(entry, vxi)
  86
  87 static inline
  88 void    __vxh_smpl(struct vx_info *vxi, int __type, void *__here)
  89 {
  90         __VXH_BODY(__type, __VXH_SMPL, __here)
  91 }
  92
  93         /* pass vxi and data (void *) */
  94
  95 #define __VXH_DATA                              \
  96         __vxh_copy_vxi(entry, vxi);             \
  97         entry->sc.data = data
  98
  99 static inline
 100 void    __vxh_data(struct vx_info *vxi, void *data,
 101                         int __type, void *__here)
 102 {
 103         __VXH_BODY(__type, __VXH_DATA, __here)
 104 }
 105
 106         /* pass vxi and arg (long) */
 107
 108 #define __VXH_LONG                              \
 109         __vxh_copy_vxi(entry, vxi);             \
 110         entry->ll.arg = arg
 111
 112 static inline
 113 void    __vxh_long(struct vx_info *vxi, long arg,
 114                         int __type, void *__here)
 115 {
 116         __VXH_BODY(__type, __VXH_LONG, __here)
 117 }
 118
 119
 120 static inline
 121 void    __vxh_throw_oops(void *__here)
 122 {
 123         __VXH_BODY(VXH_THROW_OOPS, {}, __here);
 124         /* prevent further acquisition */
 125         vxh_active = 0;
 126 }
 127
 128
 129 #define vxh_throw_oops()        __vxh_throw_oops(__HERE__);
 130
 131 #define __vxh_get_vx_info(v,h)  __vxh_smpl(v, VXH_GET_VX_INFO, h);
 132 #define __vxh_put_vx_info(v,h)  __vxh_smpl(v, VXH_PUT_VX_INFO, h);
 133
 134 #define __vxh_init_vx_info(v,d,h) \
 135         __vxh_data(v,d, VXH_INIT_VX_INFO, h);
 136 #define __vxh_set_vx_info(v,d,h) \
 137         __vxh_data(v,d, VXH_SET_VX_INFO, h);
 138 #define __vxh_clr_vx_info(v,d,h) \
 139         __vxh_data(v,d, VXH_CLR_VX_INFO, h);
 140
 141 #define __vxh_claim_vx_info(v,d,h) \
 142         __vxh_data(v,d, VXH_CLAIM_VX_INFO, h);
 143 #define __vxh_release_vx_info(v,d,h) \
 144         __vxh_data(v,d, VXH_RELEASE_VX_INFO, h);
 145
 146 #define vxh_alloc_vx_info(v) \
 147         __vxh_smpl(v, VXH_ALLOC_VX_INFO, __HERE__);
 148 #define vxh_dealloc_vx_info(v) \
 149         __vxh_smpl(v, VXH_DEALLOC_VX_INFO, __HERE__);
 150
 151 #define vxh_hash_vx_info(v) \
 152         __vxh_smpl(v, VXH_HASH_VX_INFO, __HERE__);
 153 #define vxh_unhash_vx_info(v) \
 154         __vxh_smpl(v, VXH_UNHASH_VX_INFO, __HERE__);
 155
 156 #define vxh_loc_vx_info(v,l) \
 157         __vxh_long(v,l, VXH_LOC_VX_INFO, __HERE__);
 158 #define vxh_lookup_vx_info(v,l) \
 159         __vxh_long(v,l, VXH_LOOKUP_VX_INFO, __HERE__);
 160 #define vxh_create_vx_info(v,l) \
 161         __vxh_long(v,l, VXH_CREATE_VX_INFO, __HERE__);
 162
 163 extern void vxh_dump_history(void);
 164
 165
 166 #else  /* CONFIG_VSERVER_HISTORY */
 167
 168 #define __HERE__        0
 169
 170 #define vxh_throw_oops()                do { } while (0)
 171
 172 #define __vxh_get_vx_info(v,h)          do { } while (0)
 173 #define __vxh_put_vx_info(v,h)          do { } while (0)
 174
 175 #define __vxh_init_vx_info(v,d,h)       do { } while (0)
 176 #define __vxh_set_vx_info(v,d,h)        do { } while (0)
 177 #define __vxh_clr_vx_info(v,d,h)        do { } while (0)
 178
 179 #define __vxh_claim_vx_info(v,d,h)      do { } while (0)
 180 #define __vxh_release_vx_info(v,d,h)    do { } while (0)
 181
 182 #define vxh_alloc_vx_info(v)            do { } while (0)
 183 #define vxh_dealloc_vx_info(v)          do { } while (0)
 184
 185 #define vxh_hash_vx_info(v)             do { } while (0)
 186 #define vxh_unhash_vx_info(v)           do { } while (0)
 187
 188 #define vxh_loc_vx_info(a,v)            do { } while (0)
 189 #define vxh_lookup_vx_info(a,v)         do { } while (0)
 190 #define vxh_create_vx_info(a,v)         do { } while (0)
 191
 192 #define vxh_dump_history()              do { } while (0)
 193
 194
 195 #endif /* CONFIG_VSERVER_HISTORY */
 196
 197 #endif /* _VX_HISTORY_H */