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cpu/x86: add a barrier with timeout 

In case something goes wrong on one of the
cpus, add the ability to use a barrier with
timeout so that other cpus don't wait forever.
Remove static from barrier wait and release.

BUG=chrome-os-partner:59875
BRANCH=reef
TEST=None

Change-Id: Iab6bd30ddf7632c7a5785b338798960c26016b24
Signed-off-by: Bora Guvendik <bora.guvendik@intel.com>
Reviewed-on: https://review.coreboot.org/18107
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
This commit is contained in:
Bora Guvendik 2017-01-04 16:51:31 -08:00 committed by Martin Roth
parent 4796c32ad6
commit 9b76f0b27b
2 changed files with 35 additions and 2 deletions
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27
src/cpu/x86/mp_init.c
View File

@ -138,14 +138,37 @@ struct cpu_map {
/* Keep track of APIC and device structure for each CPU. */ /* Keep track of APIC and device structure for each CPU. */
static struct cpu_map cpus[CONFIG_MAX_CPUS]; static struct cpu_map cpus[CONFIG_MAX_CPUS];
static inline void barrier_wait(atomic_t *b) inline void barrier_wait(atomic_t *b)
{ {
while (atomic_read(b) == 0) while (atomic_read(b) == 0)
asm ("pause"); asm ("pause");
mfence(); mfence();
} }
static inline void release_barrier(atomic_t *b) /* Returns 1 if timeout occurs before barier is released.
* returns 0 if barrier is released before timeout. */
int barrier_wait_timeout(atomic_t *b, uint32_t timeout_ms)
{
int timeout = 0;
struct mono_time current, end;
timer_monotonic_get(&current);
end = current;
mono_time_add_msecs(&end, timeout_ms);
while ((atomic_read(b) == 0) && (!mono_time_after(&current, &end))) {
timer_monotonic_get(&current);
asm ("pause");
}
mfence();
if (mono_time_after(&current, &end))
timeout = 1;
return timeout;
}
inline void release_barrier(atomic_t *b)
{ {
mfence(); mfence();
atomic_set(b, 1); atomic_set(b, 1);

10
src/include/cpu/x86/mp.h
View File

@ -150,5 +150,15 @@ int mp_park_aps(void);
void smm_initiate_relocation_parallel(void); void smm_initiate_relocation_parallel(void);
/* Send SMI to self with single execution. */ /* Send SMI to self with single execution. */
void smm_initiate_relocation(void); void smm_initiate_relocation(void);
/* Make a CPU wait until the barrier is released */
void barrier_wait(atomic_t *b);
/*
* Make a CPU wait until the barrier is released, or timeout occurs
* returns 1 if timeout occurs before barier is released.
* returns 0 if barrier is released before timeout.
*/
int barrier_wait_timeout(atomic_t *b, uint32_t timeout_ms);
/* Release a barrier so that other CPUs waiting for that barrier can continue */
void release_barrier(atomic_t *b);
#endif /* _X86_MP_H_ */ #endif /* _X86_MP_H_ */