diff mbox series

[v3,05/13] drivers/firmware: Expose psci_get_version through psci_ops structure

Message ID 1515432758-26440-6-git-send-email-will.deacon@arm.com
State Accepted
Commit d68e3ba5303f7e1099f51fdcd155f5263da8569b
Headers show
Series arm64 kpti hardening and variant 2 workarounds | expand

Commit Message

Will Deacon Jan. 8, 2018, 5:32 p.m. UTC 
Entry into recent versions of ARM Trusted Firmware will invalidate the CPU
branch predictor state in order to protect against aliasing attacks.

This patch exposes the PSCI "VERSION" function via psci_ops, so that it
can be invoked outside of the PSCI driver where necessary.

Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>

Signed-off-by: Will Deacon <will.deacon@arm.com>

---
 drivers/firmware/psci.c | 2 ++
 include/linux/psci.h    | 1 +
 2 files changed, 3 insertions(+)

-- 
2.1.4
diff mbox series

Patch

diff --git a/drivers/firmware/psci.c b/drivers/firmware/psci.c
index d687ca3d5049..8b25d31e8401 100644
--- a/drivers/firmware/psci.c
+++ b/drivers/firmware/psci.c
@@ -496,6 +496,8 @@  static void __init psci_init_migrate(void)
 static void __init psci_0_2_set_functions(void)
 {
 	pr_info("Using standard PSCI v0.2 function IDs\n");
+	psci_ops.get_version = psci_get_version;
+
 	psci_function_id[PSCI_FN_CPU_SUSPEND] =
 					PSCI_FN_NATIVE(0_2, CPU_SUSPEND);
 	psci_ops.cpu_suspend = psci_cpu_suspend;
diff --git a/include/linux/psci.h b/include/linux/psci.h
index bdea1cb5e1db..6306ab10af18 100644
--- a/include/linux/psci.h
+++ b/include/linux/psci.h
@@ -26,6 +26,7 @@  int psci_cpu_init_idle(unsigned int cpu);
 int psci_cpu_suspend_enter(unsigned long index);
 
 struct psci_operations {
+	u32 (*get_version)(void);
 	int (*cpu_suspend)(u32 state, unsigned long entry_point);
 	int (*cpu_off)(u32 state);
 	int (*cpu_on)(unsigned long cpuid, unsigned long entry_point);