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
 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