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cpu/x86: Add support to run function on single AP

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This patch ensures that user can select a specific AP to run
a function.

BUG=b:74436746
BRANCH=none
TEST=Able to run functions over APs with argument.

Change-Id: Iff2f34900ce2a96ef6ff0779b651f25ebfc739ad
Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-on: https://review.coreboot.org/26034
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Subrata Banik
2018-05-03 18:48:41 +05:30
parent e66600ee4f
commit 8a25caee05
3 changed files with 29 additions and 9 deletions
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22
src/cpu/x86/mp_init.c
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@ -43,6 +43,7 @@
struct mp_callback {
void (*func)(void *);
void *arg;
int logical_cpu_number;
};
/*
@ -924,11 +925,13 @@ static void ap_wait_for_instruction(void)
{
struct mp_callback lcb;
struct mp_callback **per_cpu_slot;
int cur_cpu;
if (!IS_ENABLED(CONFIG_PARALLEL_MP_AP_WORK))
return;
per_cpu_slot = &ap_callbacks[cpu_index()];
cur_cpu = cpu_index();
per_cpu_slot = &ap_callbacks[cur_cpu];
while (1) {
struct mp_callback *cb = read_callback(per_cpu_slot);
@ -942,13 +945,19 @@ static void ap_wait_for_instruction(void)
memcpy(&lcb, cb, sizeof(lcb));
mfence();
store_callback(per_cpu_slot, NULL);
lcb.func(lcb.arg);
if (lcb.logical_cpu_number && (cur_cpu !=
lcb.logical_cpu_number))
continue;
else
lcb.func(lcb.arg);
}
}
int mp_run_on_aps(void (*func)(void *), void *arg, long expire_us)
int mp_run_on_aps(void (*func)(void *), void *arg, int logical_cpu_num,
long expire_us)
{
struct mp_callback lcb = { .func = func, .arg = arg };
struct mp_callback lcb = { .func = func, .arg = arg,
.logical_cpu_number = logical_cpu_num};
return run_ap_work(&lcb, expire_us);
}
@ -957,7 +966,7 @@ int mp_run_on_all_cpus(void (*func)(void *), void *arg, long expire_us)
/* Run on BSP first. */
func(arg);
return mp_run_on_aps(func, arg, expire_us);
return mp_run_on_aps(func, arg, MP_RUN_ON_ALL_CPUS, expire_us);
}
int mp_park_aps(void)
@ -968,7 +977,8 @@ int mp_park_aps(void)
stopwatch_init(&sw);
ret = mp_run_on_aps(park_this_cpu, NULL, 250 * USECS_PER_MSEC);
ret = mp_run_on_aps(park_this_cpu, NULL, MP_RUN_ON_ALL_CPUS,
250 * USECS_PER_MSEC);
duration_msecs = stopwatch_duration_msecs(&sw);