Flush `psci_plat_pm_ops` after initialization

The `psci_plat_pm_ops` global pointer is initialized during cold boot by the
primary CPU and will be accessed by the secondary CPUs before enabling data
cache during warm boot. This patch adds a missing data cache flush of
`psci_plat_psci_ops` after initialization during psci_setup() so that
secondaries can see the updated `psci_plat_psci_ops` pointer.

Fixes ARM-software/tf-issues#424

Change-Id: Id4554800b5646302b944115a33be69507d53cedb

diff --git a/lib/psci/psci_setup.c b/lib/psci/psci_setup.c
index 20d06352c41ba621515ccb6b6723386ddd6162e3..aa2ed51027ac61ac60360c8d3af1867402bfd195 100644 (file)
--- a/lib/psci/psci_setup.c
+++ b/lib/psci/psci_setup.c
@@ -238,6 +238,13 @@ int psci_setup(uintptr_t mailbox_ep)
        plat_setup_psci_ops(mailbox_ep, &psci_plat_pm_ops);
        assert(psci_plat_pm_ops);
 
+       /*
+        * Flush `psci_plat_pm_ops` as it will be accessed by secondary CPUs
+        * during warm boot before data cache is enabled.
+        */
+       flush_dcache_range((uintptr_t)&psci_plat_pm_ops,
+                                       sizeof(psci_plat_pm_ops));
+
        /* Initialize the psci capability */
        psci_caps = PSCI_GENERIC_CAP;