4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Mark Rutland mark.rutland@arm.com
From: Will Deacon will.deacon@arm.com
commit d68e3ba5303f7e1099f51fdcd155f5263da8569b upstream.
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 Signed-off-by: Catalin Marinas catalin.marinas@arm.com Signed-off-by: Mark Rutland mark.rutland@arm.com [v4.9 backport] Tested-by: Greg Hackmann ghackmann@google.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/firmware/psci.c | 2 ++ include/linux/psci.h | 1 + 2 files changed, 3 insertions(+)
--- a/drivers/firmware/psci.c +++ b/drivers/firmware/psci.c @@ -496,6 +496,8 @@ static void __init psci_init_migrate(voi 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; --- 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);