drivers/block/drbd/drbd_polymorph_printk.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 #ifndef DRBD_POLYMORPH_PRINTK_H
   3 #define DRBD_POLYMORPH_PRINTK_H
   4
   5 #if !defined(CONFIG_DYNAMIC_DEBUG)
   6 #undef DEFINE_DYNAMIC_DEBUG_METADATA
   7 #undef __dynamic_pr_debug
   8 #undef DYNAMIC_DEBUG_BRANCH
   9 #define DEFINE_DYNAMIC_DEBUG_METADATA(D, F) const char *D = F; ((void)D)
  10 #define __dynamic_pr_debug(D, F, args...) do { (void)(D); if (0) printk(F, ## args); } while (0)
  11 #define DYNAMIC_DEBUG_BRANCH(D) false
  12 #endif
  13
  14
  15 #define __drbd_printk_drbd_device_prep(device)                  \
  16         const struct drbd_device *__d = (device);               \
  17         const struct drbd_resource *__r = __d->resource
  18 #define __drbd_printk_drbd_device_fmt(fmt)      "drbd %s/%u drbd%u: " fmt
  19 #define __drbd_printk_drbd_device_args()        __r->name, __d->vnr, __d->minor
  20 #define __drbd_printk_drbd_device_unprep()
  21
  22 #define __drbd_printk_drbd_peer_device_prep(peer_device)        \
  23         const struct drbd_device *__d;                          \
  24         const struct drbd_resource *__r;                        \
  25         __d = (peer_device)->device;                            \
  26         __r = __d->resource
  27 #define __drbd_printk_drbd_peer_device_fmt(fmt) \
  28         "drbd %s/%u drbd%u: " fmt
  29 #define __drbd_printk_drbd_peer_device_args() \
  30         __r->name, __d->vnr, __d->minor
  31 #define __drbd_printk_drbd_peer_device_unprep()
  32
  33 #define __drbd_printk_drbd_resource_prep(resource) \
  34         const struct drbd_resource *__r = resource
  35 #define __drbd_printk_drbd_resource_fmt(fmt) "drbd %s: " fmt
  36 #define __drbd_printk_drbd_resource_args()      __r->name
  37 #define __drbd_printk_drbd_resource_unprep(resource)
  38
  39 #define __drbd_printk_drbd_connection_prep(connection)          \
  40         const struct drbd_connection *__c = (connection);       \
  41         const struct drbd_resource *__r = __c->resource
  42 #define __drbd_printk_drbd_connection_fmt(fmt)                  \
  43         "drbd %s: " fmt
  44 #define __drbd_printk_drbd_connection_args()                    \
  45         __r->name
  46 #define __drbd_printk_drbd_connection_unprep()
  47
  48 void drbd_printk_with_wrong_object_type(void);
  49 void drbd_dyn_dbg_with_wrong_object_type(void);
  50
  51 #define __drbd_printk_choose_cond(obj, struct_name) \
  52         (__builtin_types_compatible_p(typeof(obj), struct struct_name *) || \
  53          __builtin_types_compatible_p(typeof(obj), const struct struct_name *))
  54 #define __drbd_printk_if_same_type(obj, struct_name, level, fmt, args...) \
  55         __drbd_printk_choose_cond(obj, struct_name), \
  56 ({ \
  57         __drbd_printk_ ## struct_name ## _prep((const struct struct_name *)(obj)); \
  58         printk(level __drbd_printk_ ## struct_name ## _fmt(fmt), \
  59                 __drbd_printk_ ## struct_name ## _args(), ## args); \
  60         __drbd_printk_ ## struct_name ## _unprep(); \
  61 })
  62
  63 #define drbd_printk(level, obj, fmt, args...) \
  64         __builtin_choose_expr( \
  65           __drbd_printk_if_same_type(obj, drbd_device, level, fmt, ## args), \
  66           __builtin_choose_expr( \
  67             __drbd_printk_if_same_type(obj, drbd_resource, level, fmt, ## args), \
  68             __builtin_choose_expr( \
  69               __drbd_printk_if_same_type(obj, drbd_connection, level, fmt, ## args), \
  70               __builtin_choose_expr( \
  71                 __drbd_printk_if_same_type(obj, drbd_peer_device, level, fmt, ## args), \
  72                 drbd_printk_with_wrong_object_type()))))
  73
  74 #define __drbd_dyn_dbg_if_same_type(obj, struct_name, fmt, args...) \
  75         __drbd_printk_choose_cond(obj, struct_name), \
  76 ({ \
  77         DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt);         \
  78         if (DYNAMIC_DEBUG_BRANCH(descriptor)) {                 \
  79                 __drbd_printk_ ## struct_name ## _prep((const struct struct_name *)(obj)); \
  80                 __dynamic_pr_debug(&descriptor, __drbd_printk_ ## struct_name ## _fmt(fmt), \
  81                         __drbd_printk_ ## struct_name ## _args(), ## args); \
  82                 __drbd_printk_ ## struct_name ## _unprep();     \
  83         }                                                       \
  84 })
  85
  86 #define dynamic_drbd_dbg(obj, fmt, args...) \
  87         __builtin_choose_expr( \
  88           __drbd_dyn_dbg_if_same_type(obj, drbd_device, fmt, ## args), \
  89           __builtin_choose_expr( \
  90             __drbd_dyn_dbg_if_same_type(obj, drbd_resource, fmt, ## args), \
  91             __builtin_choose_expr( \
  92               __drbd_dyn_dbg_if_same_type(obj, drbd_connection, fmt, ## args), \
  93               __builtin_choose_expr( \
  94                 __drbd_dyn_dbg_if_same_type(obj, drbd_peer_device, fmt, ## args), \
  95                 drbd_dyn_dbg_with_wrong_object_type()))))
  96
  97 #define drbd_emerg(device, fmt, args...) \
  98         drbd_printk(KERN_EMERG, device, fmt, ## args)
  99 #define drbd_alert(device, fmt, args...) \
 100         drbd_printk(KERN_ALERT, device, fmt, ## args)
 101 #define drbd_crit(device, fmt, args...) \
 102         drbd_printk(KERN_CRIT, device, fmt, ## args)
 103 #define drbd_err(device, fmt, args...) \
 104         drbd_printk(KERN_ERR, device, fmt, ## args)
 105 #define drbd_warn(device, fmt, args...) \
 106         drbd_printk(KERN_WARNING, device, fmt, ## args)
 107 #define drbd_notice(device, fmt, args...) \
 108         drbd_printk(KERN_NOTICE, device, fmt, ## args)
 109 #define drbd_info(device, fmt, args...) \
 110         drbd_printk(KERN_INFO, device, fmt, ## args)
 111
 112
 113 #define drbd_ratelimit() \
 114 ({                                              \
 115         static DEFINE_RATELIMIT_STATE(_rs,      \
 116                 DEFAULT_RATELIMIT_INTERVAL,     \
 117                 DEFAULT_RATELIMIT_BURST);       \
 118         __ratelimit(&_rs);                      \
 119 })
 120
 121 #define D_ASSERT(x, exp)                                                        \
 122         do {                                                                    \
 123                 if (!(exp))                                                     \
 124                         drbd_err(x, "ASSERTION %s FAILED in %s\n",              \
 125                                 #exp, __func__);                                \
 126         } while (0)
 127
 128 /**
 129  * expect  -  Make an assertion
 130  *
 131  * Unlike the assert macro, this macro returns a boolean result.
 132  */
 133 #define expect(x, exp) ({                                                       \
 134                 bool _bool = (exp);                                             \
 135                 if (!_bool && drbd_ratelimit())                                 \
 136                         drbd_err(x, "ASSERTION %s FAILED in %s\n",              \
 137                                 #exp, __func__);                                \
 138                 _bool;                                                          \
 139                 })
 140
 141 #endif