From 99a573fb326faf5a7bff50e4f9875f2066728d95 Mon Sep 17 00:00:00 2001
From: Simon Glass
Date: Fri, 17 Jul 2020 08:48:20 -0600
Subject: x86: mp: Park CPUs before running the OS

With the new MP features the CPUs are no-longer parked when the OS is run.
Fix this by calling a special function to park them, just before the OS is
started.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
---
 arch/x86/cpu/cpu.c        |  5 +++++
 arch/x86/cpu/mp_init.c    | 16 ++++++++++++++++
 arch/x86/include/asm/mp.h | 17 +++++++++++++++++
 3 files changed, 38 insertions(+)

diff --git a/arch/x86/cpu/cpu.c b/arch/x86/cpu/cpu.c
index c343586e04b..69c14189d1f 100644
--- a/arch/x86/cpu/cpu.c
+++ b/arch/x86/cpu/cpu.c
@@ -67,6 +67,11 @@ static const char *const x86_vendor_name[] = {
 
 int __weak x86_cleanup_before_linux(void)
 {
+	int ret;
+
+	ret = mp_park_aps();
+	if (ret)
+		return log_msg_ret("park", ret);
 	bootstage_stash((void *)CONFIG_BOOTSTAGE_STASH_ADDR,
 			CONFIG_BOOTSTAGE_STASH_SIZE);
 
diff --git a/arch/x86/cpu/mp_init.c b/arch/x86/cpu/mp_init.c
index dd6d6bfab7e..427ec8fc23f 100644
--- a/arch/x86/cpu/mp_init.c
+++ b/arch/x86/cpu/mp_init.c
@@ -668,6 +668,22 @@ int mp_run_on_cpus(int cpu_select, mp_run_func func, void *arg)
 	return 0;
 }
 
+static void park_this_cpu(void *unused)
+{
+	stop_this_cpu();
+}
+
+int mp_park_aps(void)
+{
+	int ret;
+
+	ret = mp_run_on_cpus(MP_SELECT_APS, park_this_cpu, NULL);
+	if (ret)
+		return log_ret(ret);
+
+	return 0;
+}
+
 int mp_init(void)
 {
 	int num_aps, num_cpus;
diff --git a/arch/x86/include/asm/mp.h b/arch/x86/include/asm/mp.h
index eb49e690f22..f9d6c8e6bfd 100644
--- a/arch/x86/include/asm/mp.h
+++ b/arch/x86/include/asm/mp.h
@@ -109,6 +109,15 @@ typedef void (*mp_run_func)(void *arg);
  * @return 0 on success, -ve on error
  */
 int mp_run_on_cpus(int cpu_select, mp_run_func func, void *arg);
+
+/**
+ * mp_park_aps() - Park the APs ready for the OS
+ *
+ * This halts all CPUs except the main one, ready for the OS to use them
+ *
+ * @return 0 if OK, -ve on error
+ */
+int mp_park_aps(void);
 #else
 static inline int mp_run_on_cpus(int cpu_select, mp_run_func func, void *arg)
 {
@@ -117,6 +126,14 @@ static inline int mp_run_on_cpus(int cpu_select, mp_run_func func, void *arg)
 
 	return 0;
 }
+
+static inline int mp_park_aps(void)
+{
+	/* No APs to park */
+
+	return 0;
+}
+
 #endif
 
 #endif /* _X86_MP_H_ */
-- 
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