[coreboot-gerrit] Change in coreboot[master]: cpu/x86: Add support to run function on single AP

[Subrata Banik (Code Review)]

Subrata Banik has uploaded this change for review. ( https://review.coreboot.org/26034


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

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 at intel.com>
---
M src/cpu/x86/mp_init.c
M src/include/cpu/x86/mp.h
2 files changed, 23 insertions(+), 0 deletions(-)



  git pull ssh://review.coreboot.org:29418/coreboot refs/changes/34/26034/1

diff --git a/src/cpu/x86/mp_init.c b/src/cpu/x86/mp_init.c
index ba3f309..63e57f3 100644
--- a/src/cpu/x86/mp_init.c
+++ b/src/cpu/x86/mp_init.c
@@ -964,6 +964,26 @@
 	}
 }
 
+static int ap_number;
+static mp_callback_t single_ap_callback;
+
+/* API to run a single function on a give AP with argument */
+static void run_on_single_aps(void *arg)
+{
+	if (cpu_index() != ap_number)
+		return;
+
+	single_ap_callback(arg);
+}
+
+int mp_run_on_this_ap(void (*func)(void *), void *arg, int ap, long expire_us)
+{
+	single_ap_callback = func;
+	/* Set callback AP number */
+	ap_number = ap;
+	return run_ap_work(run_on_single_aps, arg, expire_us);
+}
+
 int mp_run_on_aps(void (*func)(void *), void *arg, long expire_us)
 {
 	return run_ap_work(func, arg, expire_us);
diff --git a/src/include/cpu/x86/mp.h b/src/include/cpu/x86/mp.h
index e5bfdd3..df3d5b1 100644
--- a/src/include/cpu/x86/mp.h
+++ b/src/include/cpu/x86/mp.h
@@ -131,6 +131,9 @@
 /* Like mp_run_on_aps() but also runs func on BSP. */
 int mp_run_on_all_cpus(void (*func)(void *), void *arg, long expire_us);
 
+/* Like mp_run_on_aps() but only runs on single AP specific by AP number */
+int mp_run_on_this_ap(void (*func)(void *), void *arg, int ap, long expire_us);
+
 /*
  * Park all APs to prepare for OS boot. This is handled automatically
  * by the coreboot infrastructure.

-- 
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Gerrit-Project: coreboot
Gerrit-Branch: master
Gerrit-MessageType: newchange
Gerrit-Change-Id: Iff2f34900ce2a96ef6ff0779b651f25ebfc739ad
Gerrit-Change-Number: 26034
Gerrit-PatchSet: 1
Gerrit-Owner: Subrata Banik <subrata.banik at intel.com>
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