[PATCH v5 14/25] x86: mp: Park CPUs before running the OS

[Simon Glass]

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 <s...@chromium.org>
Reviewed-by: Wolfgang Wallner <wolfgang.wall...@br-automation.com>
---

Changes in v5:
- Drop timing in mp_park_aps()

Changes in v3:
- Update the comment for mp_park_aps()

 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 d0720fb7fb..baa7dae172 100644
--- a/arch/x86/cpu/cpu.c
+++ b/arch/x86/cpu/cpu.c
@@ -66,6 +66,11 @@ 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 dd6d6bfab7..427ec8fc23 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 eb49e690f2..f9d6c8e6bf 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_ */
-- 
2.27.0.389.gc38d7665816-goog