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Commit f91f1907 authored by Will Deacon's avatar Will Deacon Committed by Greg Kroah-Hartman
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drivers/firmware: Expose psci_get_version through psci_ops structure 




Commit d68e3ba5303f 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: default avatarLorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Signed-off-by: default avatarArd Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent be53742b

drivers/firmware/psci.c

+2 −0
Original line number Diff line number Diff line
@@ -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;

include/linux/psci.h

+1 −0
Original line number Diff line number Diff line
@@ -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);