diff options
| author | Kane Chen <kane.chen@intel.corp-partner.google.com> | 2022-04-29 16:35:23 +0800 |
|---|---|---|
| committer | Werner Zeh <werner.zeh@siemens.com> | 2022-05-16 04:49:25 +0000 |
| commit | c9b1f8a28e90ff6890a4f74559f5136edc5a33f9 (patch) | |
| tree | cff9eb50eb85a3bf618c7c24e22d750604eb45c4 /src/include | |
| parent | 8b02bd1f8de71d852daf41df80d6bb27e86b90f7 (diff) | |
cpu/x86/mp_init.c: Add mp_run_on_all_cpus_synchronously
MTRR is a core level register which means 2 threads in one core share
same MTRR. There is a race condition could happen that AP overrides
BSP MTRR unintentionally.
In order to prevent such race condition between BSP and APs, this
patch provides a function to let BSP assign tasks to all APs and wait
them to complete the assigned tasks.
BUG=b:225766934
Change-Id: I8d1d49bca410c821a3ad0347548afc42eb860594
Signed-off-by: Kane Chen <kane.chen@intel.corp-partner.google.com>
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/63566
Reviewed-by: Subrata Banik <subratabanik@google.com>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'src/include')
| -rw-r--r-- | src/include/cpu/x86/mp.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/src/include/cpu/x86/mp.h b/src/include/cpu/x86/mp.h index 1b4c956b59..8105477c49 100644 --- a/src/include/cpu/x86/mp.h +++ b/src/include/cpu/x86/mp.h @@ -117,6 +117,10 @@ enum cb_err mp_run_on_all_aps(void (*func)(void *), void *arg, long expire_us, /* Like mp_run_on_aps() but also runs func on BSP. */ enum cb_err mp_run_on_all_cpus(void (*func)(void *), void *arg); +/* Like mp_run_on_all_cpus but make sure all APs finish executing the + function call. The time limit on a function call is 1 second. */ +enum cb_err mp_run_on_all_cpus_synchronously(void (*func)(void *), void *arg); + /* * Park all APs to prepare for OS boot. This is handled automatically * by the coreboot infrastructure. |