diff options
| author | Subrata Banik <subrata.banik@intel.com> | 2018-05-03 18:48:41 +0530 |
|---|---|---|
| committer | Subrata Banik <subrata.banik@intel.com> | 2018-05-19 01:16:06 +0000 |
| commit | 8a25caee0507655d775e3dcc21b36b01ca517113 (patch) | |
| tree | 7cde904b2a0c3a3296a1008a3167a0f1f43e61de /src/cpu/x86 | |
| parent | e66600ee4f33291ef620133c7f2df54f449d9470 (diff) | |
cpu/x86: Add support to run function on single AP
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>
Diffstat (limited to 'src/cpu/x86')
| -rw-r--r-- | src/cpu/x86/mp_init.c | 22 |
1 files changed, 16 insertions, 6 deletions
diff --git a/src/cpu/x86/mp_init.c b/src/cpu/x86/mp_init.c index ef576ec26d..a696cd0a5c 100644 --- a/src/cpu/x86/mp_init.c +++ b/src/cpu/x86/mp_init.c @@ -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); |