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
48void drbd_printk_with_wrong_object_type(void);
49void 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
142

source code of linux/drivers/block/drbd/drbd_polymorph_printk.h