cpu/x86: allow AP callbacks after MP init

There are circumstances where the APs need to run a piece of
code later in the boot flow. The current MP init just parks
the APs after MP init is completed so there's not an opportunity
to target running a piece of code on all the APs at a later time.
Therefore, provide an option, PARALLEL_MP_AP_WORK, that allows
the APs to perform callbacks.

BUG=chrome-os-partner:60657
BRANCH=reef

Change-Id: I849ecfdd6641dd9424943e246317cd1996ef1ba6
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/17745
Tested-by: build bot (Jenkins)
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Lijian Zhao <lijian.zhao@intel.com>

1 files changed, 18 insertions, 0 deletions

diff --git a/src/include/cpu/x86/mp.h b/src/include/cpu/x86/mp.h
index 6d51d7b005..b9b4d5772c 100644
--- a/src/include/cpu/x86/mp.h
+++ b/src/include/cpu/x86/mp.h
@@ -124,6 +124,24 @@ struct mp_ops {
  */
 int mp_init_with_smm(struct bus *cpu_bus, const struct mp_ops *mp_ops);
 
+
+/*
+ * After APs are up and PARALLEL_MP_AP_WORK is enabled one can issue work
+ * to all the APs to perform. Currently the BSP is the only CPU that is allowed
+ * to issue work. i.e. the APs should not call any of these functions.
+ * All functions return < 0 on error, 0 on success.
+ */
+int mp_run_on_aps(void (*func)(void), long expire_us);
+
+/* Like mp_run_on_aps() but also runs func on BSP. */
+int mp_run_on_all_cpus(void (*func)(void), long expire_us);
+
+/*
+ * Park all APs to prepare for OS boot. This is handled automatically
+ * by the coreboot infrastructure.
+ */
+int mp_park_aps(void);
+
 /*
  * SMM helpers to use with initializing CPUs.
  */