Blame view
lib/spinlock_debug.c
6.81 KB
fb1c8f93d [PATCH] spinlock ... |
1 2 3 4 5 6 7 |
/* * Copyright 2005, Red Hat, Inc., Ingo Molnar * Released under the General Public License (GPL). * * This file contains the spinlock/rwlock implementations for * DEBUG_SPINLOCK. */ |
fb1c8f93d [PATCH] spinlock ... |
8 |
#include <linux/spinlock.h> |
bb81a09e5 [PATCH] x86: all ... |
9 |
#include <linux/nmi.h> |
fb1c8f93d [PATCH] spinlock ... |
10 |
#include <linux/interrupt.h> |
9a11b49a8 [PATCH] lockdep: ... |
11 |
#include <linux/debug_locks.h> |
fb1c8f93d [PATCH] spinlock ... |
12 |
#include <linux/delay.h> |
9a11b49a8 [PATCH] lockdep: ... |
13 |
#include <linux/module.h> |
fb1c8f93d [PATCH] spinlock ... |
14 |
|
c2f21ce2e locking: Implemen... |
15 16 |
void __raw_spin_lock_init(raw_spinlock_t *lock, const char *name, struct lock_class_key *key) |
8a25d5deb [PATCH] lockdep: ... |
17 18 19 20 21 22 |
{ #ifdef CONFIG_DEBUG_LOCK_ALLOC /* * Make sure we are not reinitializing a held lock: */ debug_check_no_locks_freed((void *)lock, sizeof(*lock)); |
4dfbb9d8c Lockdep: add lock... |
23 |
lockdep_init_map(&lock->dep_map, name, key, 0); |
8a25d5deb [PATCH] lockdep: ... |
24 |
#endif |
edc35bd72 locking: Rename _... |
25 |
lock->raw_lock = (arch_spinlock_t)__ARCH_SPIN_LOCK_UNLOCKED; |
8a25d5deb [PATCH] lockdep: ... |
26 27 28 29 |
lock->magic = SPINLOCK_MAGIC; lock->owner = SPINLOCK_OWNER_INIT; lock->owner_cpu = -1; } |
c2f21ce2e locking: Implemen... |
30 |
EXPORT_SYMBOL(__raw_spin_lock_init); |
8a25d5deb [PATCH] lockdep: ... |
31 32 33 34 35 36 37 38 39 |
void __rwlock_init(rwlock_t *lock, const char *name, struct lock_class_key *key) { #ifdef CONFIG_DEBUG_LOCK_ALLOC /* * Make sure we are not reinitializing a held lock: */ debug_check_no_locks_freed((void *)lock, sizeof(*lock)); |
4dfbb9d8c Lockdep: add lock... |
40 |
lockdep_init_map(&lock->dep_map, name, key, 0); |
8a25d5deb [PATCH] lockdep: ... |
41 |
#endif |
fb3a6bbc9 locking: Convert ... |
42 |
lock->raw_lock = (arch_rwlock_t) __ARCH_RW_LOCK_UNLOCKED; |
8a25d5deb [PATCH] lockdep: ... |
43 44 45 46 47 48 |
lock->magic = RWLOCK_MAGIC; lock->owner = SPINLOCK_OWNER_INIT; lock->owner_cpu = -1; } EXPORT_SYMBOL(__rwlock_init); |
4e101b0e6 lib/spinlock_debu... |
49 |
static void spin_dump(raw_spinlock_t *lock, const char *msg) |
fb1c8f93d [PATCH] spinlock ... |
50 |
{ |
fb1c8f93d [PATCH] spinlock ... |
51 |
struct task_struct *owner = NULL; |
9a11b49a8 [PATCH] lockdep: ... |
52 53 54 55 56 |
if (lock->owner && lock->owner != SPINLOCK_OWNER_INIT) owner = lock->owner; printk(KERN_EMERG "BUG: spinlock %s on CPU#%d, %s/%d ", msg, raw_smp_processor_id(), |
ba25f9dcc Use helpers to ob... |
57 |
current->comm, task_pid_nr(current)); |
9a11b49a8 [PATCH] lockdep: ... |
58 59 60 61 62 |
printk(KERN_EMERG " lock: %p, .magic: %08x, .owner: %s/%d, " ".owner_cpu: %d ", lock, lock->magic, owner ? owner->comm : "<none>", |
ba25f9dcc Use helpers to ob... |
63 |
owner ? task_pid_nr(owner) : -1, |
9a11b49a8 [PATCH] lockdep: ... |
64 65 |
lock->owner_cpu); dump_stack(); |
fb1c8f93d [PATCH] spinlock ... |
66 |
} |
4e101b0e6 lib/spinlock_debu... |
67 68 69 70 71 72 73 |
static void spin_bug(raw_spinlock_t *lock, const char *msg) { if (!debug_locks_off()) return; spin_dump(lock, msg); } |
fb1c8f93d [PATCH] spinlock ... |
74 |
#define SPIN_BUG_ON(cond, lock, msg) if (unlikely(cond)) spin_bug(lock, msg) |
9a11b49a8 [PATCH] lockdep: ... |
75 |
static inline void |
c2f21ce2e locking: Implemen... |
76 |
debug_spin_lock_before(raw_spinlock_t *lock) |
fb1c8f93d [PATCH] spinlock ... |
77 78 79 80 81 82 |
{ SPIN_BUG_ON(lock->magic != SPINLOCK_MAGIC, lock, "bad magic"); SPIN_BUG_ON(lock->owner == current, lock, "recursion"); SPIN_BUG_ON(lock->owner_cpu == raw_smp_processor_id(), lock, "cpu recursion"); } |
c2f21ce2e locking: Implemen... |
83 |
static inline void debug_spin_lock_after(raw_spinlock_t *lock) |
fb1c8f93d [PATCH] spinlock ... |
84 85 86 87 |
{ lock->owner_cpu = raw_smp_processor_id(); lock->owner = current; } |
c2f21ce2e locking: Implemen... |
88 |
static inline void debug_spin_unlock(raw_spinlock_t *lock) |
fb1c8f93d [PATCH] spinlock ... |
89 90 |
{ SPIN_BUG_ON(lock->magic != SPINLOCK_MAGIC, lock, "bad magic"); |
c2f21ce2e locking: Implemen... |
91 |
SPIN_BUG_ON(!raw_spin_is_locked(lock), lock, "already unlocked"); |
fb1c8f93d [PATCH] spinlock ... |
92 93 94 95 96 97 |
SPIN_BUG_ON(lock->owner != current, lock, "wrong owner"); SPIN_BUG_ON(lock->owner_cpu != raw_smp_processor_id(), lock, "wrong CPU"); lock->owner = SPINLOCK_OWNER_INIT; lock->owner_cpu = -1; } |
c2f21ce2e locking: Implemen... |
98 |
static void __spin_lock_debug(raw_spinlock_t *lock) |
fb1c8f93d [PATCH] spinlock ... |
99 |
{ |
fb1c8f93d [PATCH] spinlock ... |
100 |
u64 i; |
c22f008ba [PATCH] spinlock_... |
101 102 |
u64 loops = loops_per_jiffy * HZ; int print_once = 1; |
fb1c8f93d [PATCH] spinlock ... |
103 104 |
for (;;) { |
c22f008ba [PATCH] spinlock_... |
105 |
for (i = 0; i < loops; i++) { |
0199c4e68 locking: Convert ... |
106 |
if (arch_spin_trylock(&lock->raw_lock)) |
fb1c8f93d [PATCH] spinlock ... |
107 |
return; |
e0a602963 [PATCH] Fix spinl... |
108 |
__delay(1); |
fb1c8f93d [PATCH] spinlock ... |
109 110 111 112 |
} /* lockup suspected: */ if (print_once) { print_once = 0; |
4e101b0e6 lib/spinlock_debu... |
113 |
spin_dump(lock, "lockup"); |
bb81a09e5 [PATCH] x86: all ... |
114 115 116 |
#ifdef CONFIG_SMP trigger_all_cpu_backtrace(); #endif |
fb1c8f93d [PATCH] spinlock ... |
117 118 119 |
} } } |
9828ea9d7 locking: Further ... |
120 |
void do_raw_spin_lock(raw_spinlock_t *lock) |
fb1c8f93d [PATCH] spinlock ... |
121 122 |
{ debug_spin_lock_before(lock); |
0199c4e68 locking: Convert ... |
123 |
if (unlikely(!arch_spin_trylock(&lock->raw_lock))) |
fb1c8f93d [PATCH] spinlock ... |
124 125 126 |
__spin_lock_debug(lock); debug_spin_lock_after(lock); } |
9828ea9d7 locking: Further ... |
127 |
int do_raw_spin_trylock(raw_spinlock_t *lock) |
fb1c8f93d [PATCH] spinlock ... |
128 |
{ |
0199c4e68 locking: Convert ... |
129 |
int ret = arch_spin_trylock(&lock->raw_lock); |
fb1c8f93d [PATCH] spinlock ... |
130 131 132 133 134 135 136 137 138 139 140 |
if (ret) debug_spin_lock_after(lock); #ifndef CONFIG_SMP /* * Must not happen on UP: */ SPIN_BUG_ON(!ret, lock, "trylock failure on UP"); #endif return ret; } |
9828ea9d7 locking: Further ... |
141 |
void do_raw_spin_unlock(raw_spinlock_t *lock) |
fb1c8f93d [PATCH] spinlock ... |
142 143 |
{ debug_spin_unlock(lock); |
0199c4e68 locking: Convert ... |
144 |
arch_spin_unlock(&lock->raw_lock); |
fb1c8f93d [PATCH] spinlock ... |
145 146 147 148 |
} static void rwlock_bug(rwlock_t *lock, const char *msg) { |
9a11b49a8 [PATCH] lockdep: ... |
149 150 151 152 153 154 |
if (!debug_locks_off()) return; printk(KERN_EMERG "BUG: rwlock %s on CPU#%d, %s/%d, %p ", msg, raw_smp_processor_id(), current->comm, |
ba25f9dcc Use helpers to ob... |
155 |
task_pid_nr(current), lock); |
9a11b49a8 [PATCH] lockdep: ... |
156 |
dump_stack(); |
fb1c8f93d [PATCH] spinlock ... |
157 158 159 |
} #define RWLOCK_BUG_ON(cond, lock, msg) if (unlikely(cond)) rwlock_bug(lock, msg) |
72f0b4e21 [PATCH] disable d... |
160 |
#if 0 /* __write_lock_debug() can lock up - maybe this can too? */ |
fb1c8f93d [PATCH] spinlock ... |
161 162 |
static void __read_lock_debug(rwlock_t *lock) { |
fb1c8f93d [PATCH] spinlock ... |
163 |
u64 i; |
c22f008ba [PATCH] spinlock_... |
164 165 |
u64 loops = loops_per_jiffy * HZ; int print_once = 1; |
fb1c8f93d [PATCH] spinlock ... |
166 167 |
for (;;) { |
c22f008ba [PATCH] spinlock_... |
168 |
for (i = 0; i < loops; i++) { |
e5931943d locking: Convert ... |
169 |
if (arch_read_trylock(&lock->raw_lock)) |
fb1c8f93d [PATCH] spinlock ... |
170 |
return; |
e0a602963 [PATCH] Fix spinl... |
171 |
__delay(1); |
fb1c8f93d [PATCH] spinlock ... |
172 173 174 175 |
} /* lockup suspected: */ if (print_once) { print_once = 0; |
51989b9ff [PATCH] printk le... |
176 177 178 |
printk(KERN_EMERG "BUG: read-lock lockup on CPU#%d, " "%s/%d, %p ", |
bb44f116a [PATCH] fix spinl... |
179 180 |
raw_smp_processor_id(), current->comm, current->pid, lock); |
fb1c8f93d [PATCH] spinlock ... |
181 182 183 184 |
dump_stack(); } } } |
72f0b4e21 [PATCH] disable d... |
185 |
#endif |
fb1c8f93d [PATCH] spinlock ... |
186 |
|
9828ea9d7 locking: Further ... |
187 |
void do_raw_read_lock(rwlock_t *lock) |
fb1c8f93d [PATCH] spinlock ... |
188 189 |
{ RWLOCK_BUG_ON(lock->magic != RWLOCK_MAGIC, lock, "bad magic"); |
e5931943d locking: Convert ... |
190 |
arch_read_lock(&lock->raw_lock); |
fb1c8f93d [PATCH] spinlock ... |
191 |
} |
9828ea9d7 locking: Further ... |
192 |
int do_raw_read_trylock(rwlock_t *lock) |
fb1c8f93d [PATCH] spinlock ... |
193 |
{ |
e5931943d locking: Convert ... |
194 |
int ret = arch_read_trylock(&lock->raw_lock); |
fb1c8f93d [PATCH] spinlock ... |
195 196 197 198 199 200 201 202 203 |
#ifndef CONFIG_SMP /* * Must not happen on UP: */ RWLOCK_BUG_ON(!ret, lock, "trylock failure on UP"); #endif return ret; } |
9828ea9d7 locking: Further ... |
204 |
void do_raw_read_unlock(rwlock_t *lock) |
fb1c8f93d [PATCH] spinlock ... |
205 206 |
{ RWLOCK_BUG_ON(lock->magic != RWLOCK_MAGIC, lock, "bad magic"); |
e5931943d locking: Convert ... |
207 |
arch_read_unlock(&lock->raw_lock); |
fb1c8f93d [PATCH] spinlock ... |
208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 |
} static inline void debug_write_lock_before(rwlock_t *lock) { RWLOCK_BUG_ON(lock->magic != RWLOCK_MAGIC, lock, "bad magic"); RWLOCK_BUG_ON(lock->owner == current, lock, "recursion"); RWLOCK_BUG_ON(lock->owner_cpu == raw_smp_processor_id(), lock, "cpu recursion"); } static inline void debug_write_lock_after(rwlock_t *lock) { lock->owner_cpu = raw_smp_processor_id(); lock->owner = current; } static inline void debug_write_unlock(rwlock_t *lock) { RWLOCK_BUG_ON(lock->magic != RWLOCK_MAGIC, lock, "bad magic"); RWLOCK_BUG_ON(lock->owner != current, lock, "wrong owner"); RWLOCK_BUG_ON(lock->owner_cpu != raw_smp_processor_id(), lock, "wrong CPU"); lock->owner = SPINLOCK_OWNER_INIT; lock->owner_cpu = -1; } |
72f0b4e21 [PATCH] disable d... |
233 |
#if 0 /* This can cause lockups */ |
fb1c8f93d [PATCH] spinlock ... |
234 235 |
static void __write_lock_debug(rwlock_t *lock) { |
fb1c8f93d [PATCH] spinlock ... |
236 |
u64 i; |
c22f008ba [PATCH] spinlock_... |
237 238 |
u64 loops = loops_per_jiffy * HZ; int print_once = 1; |
fb1c8f93d [PATCH] spinlock ... |
239 240 |
for (;;) { |
c22f008ba [PATCH] spinlock_... |
241 |
for (i = 0; i < loops; i++) { |
e5931943d locking: Convert ... |
242 |
if (arch_write_trylock(&lock->raw_lock)) |
fb1c8f93d [PATCH] spinlock ... |
243 |
return; |
e0a602963 [PATCH] Fix spinl... |
244 |
__delay(1); |
fb1c8f93d [PATCH] spinlock ... |
245 246 247 248 |
} /* lockup suspected: */ if (print_once) { print_once = 0; |
51989b9ff [PATCH] printk le... |
249 250 251 |
printk(KERN_EMERG "BUG: write-lock lockup on CPU#%d, " "%s/%d, %p ", |
bb44f116a [PATCH] fix spinl... |
252 253 |
raw_smp_processor_id(), current->comm, current->pid, lock); |
fb1c8f93d [PATCH] spinlock ... |
254 255 256 257 |
dump_stack(); } } } |
72f0b4e21 [PATCH] disable d... |
258 |
#endif |
fb1c8f93d [PATCH] spinlock ... |
259 |
|
9828ea9d7 locking: Further ... |
260 |
void do_raw_write_lock(rwlock_t *lock) |
fb1c8f93d [PATCH] spinlock ... |
261 262 |
{ debug_write_lock_before(lock); |
e5931943d locking: Convert ... |
263 |
arch_write_lock(&lock->raw_lock); |
fb1c8f93d [PATCH] spinlock ... |
264 265 |
debug_write_lock_after(lock); } |
9828ea9d7 locking: Further ... |
266 |
int do_raw_write_trylock(rwlock_t *lock) |
fb1c8f93d [PATCH] spinlock ... |
267 |
{ |
e5931943d locking: Convert ... |
268 |
int ret = arch_write_trylock(&lock->raw_lock); |
fb1c8f93d [PATCH] spinlock ... |
269 270 271 272 273 274 275 276 277 278 279 |
if (ret) debug_write_lock_after(lock); #ifndef CONFIG_SMP /* * Must not happen on UP: */ RWLOCK_BUG_ON(!ret, lock, "trylock failure on UP"); #endif return ret; } |
9828ea9d7 locking: Further ... |
280 |
void do_raw_write_unlock(rwlock_t *lock) |
fb1c8f93d [PATCH] spinlock ... |
281 282 |
{ debug_write_unlock(lock); |
e5931943d locking: Convert ... |
283 |
arch_write_unlock(&lock->raw_lock); |
fb1c8f93d [PATCH] spinlock ... |
284 |
} |