diff options
author | Peter Watkins <pwatkins@sicortex.com> | 2007-07-30 18:01:29 -0400 |
---|---|---|
committer | Ralf Baechle <ralf@linux-mips.org> | 2007-07-31 16:35:37 -0400 |
commit | b4b2917cc8babe8eaf4bc133bca31b11ed7dac13 (patch) | |
tree | 31eb7dda7083c083df0b6407f2daa15f9849ae54 /arch | |
parent | 185bcd17a5fb4155fba125332efa498be126aa4e (diff) |
[MIPS] Add smp_call_function_single()
In the other archs, there is more factoring of smp call code, and more care
in the use of get_cpu(). That can be a follow-up MIPS patch.
Signed-off-by: Peter Watkins <pwatkins@sicortex.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch')
-rw-r--r-- | arch/mips/kernel/smp.c | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/arch/mips/kernel/smp.c b/arch/mips/kernel/smp.c index 04bbbd8d91ab..73b0dab02668 100644 --- a/arch/mips/kernel/smp.c +++ b/arch/mips/kernel/smp.c | |||
@@ -194,6 +194,61 @@ void smp_call_function_interrupt(void) | |||
194 | } | 194 | } |
195 | } | 195 | } |
196 | 196 | ||
197 | int smp_call_function_single(int cpu, void (*func) (void *info), void *info, | ||
198 | int retry, int wait) | ||
199 | { | ||
200 | struct call_data_struct data; | ||
201 | int me; | ||
202 | |||
203 | /* | ||
204 | * Can die spectacularly if this CPU isn't yet marked online | ||
205 | */ | ||
206 | if (!cpu_online(cpu)) | ||
207 | return 0; | ||
208 | |||
209 | me = get_cpu(); | ||
210 | BUG_ON(!cpu_online(me)); | ||
211 | |||
212 | if (cpu == me) { | ||
213 | local_irq_disable(); | ||
214 | func(info); | ||
215 | local_irq_enable(); | ||
216 | put_cpu(); | ||
217 | return 0; | ||
218 | } | ||
219 | |||
220 | /* Can deadlock when called with interrupts disabled */ | ||
221 | WARN_ON(irqs_disabled()); | ||
222 | |||
223 | data.func = func; | ||
224 | data.info = info; | ||
225 | atomic_set(&data.started, 0); | ||
226 | data.wait = wait; | ||
227 | if (wait) | ||
228 | atomic_set(&data.finished, 0); | ||
229 | |||
230 | spin_lock(&smp_call_lock); | ||
231 | call_data = &data; | ||
232 | smp_mb(); | ||
233 | |||
234 | /* Send a message to the other CPU */ | ||
235 | core_send_ipi(cpu, SMP_CALL_FUNCTION); | ||
236 | |||
237 | /* Wait for response */ | ||
238 | /* FIXME: lock-up detection, backtrace on lock-up */ | ||
239 | while (atomic_read(&data.started) != 1) | ||
240 | barrier(); | ||
241 | |||
242 | if (wait) | ||
243 | while (atomic_read(&data.finished) != 1) | ||
244 | barrier(); | ||
245 | call_data = NULL; | ||
246 | spin_unlock(&smp_call_lock); | ||
247 | |||
248 | put_cpu(); | ||
249 | return 0; | ||
250 | } | ||
251 | |||
197 | static void stop_this_cpu(void *dummy) | 252 | static void stop_this_cpu(void *dummy) |
198 | { | 253 | { |
199 | /* | 254 | /* |