From 908ad7a1484d78228bc88d242121574f86eb35e8 Mon Sep 17 00:00:00 2001 From: Marc Zyngier Date: Tue, 6 Feb 2018 17:56:17 +0000 Subject: [PATCH] firmware/psci: Expose SMCCC version through psci_ops Commit e78eef554a91 upstream. Since PSCI 1.0 allows the SMCCC version to be (indirectly) probed, let's do that at boot time, and expose the version of the calling convention as part of the psci_ops structure. Acked-by: Lorenzo Pieralisi Reviewed-by: Robin Murphy Tested-by: Ard Biesheuvel Signed-off-by: Marc Zyngier Signed-off-by: Catalin Marinas Signed-off-by: Will Deacon Signed-off-by: Ard Biesheuvel Signed-off-by: Greg Kroah-Hartman --- drivers/firmware/psci.c | 27 +++++++++++++++++++++++++++ include/linux/psci.h | 6 ++++++ 2 files changed, 33 insertions(+) diff --git a/drivers/firmware/psci.c b/drivers/firmware/psci.c index e9493da2b111..c80ec1d03274 100644 --- a/drivers/firmware/psci.c +++ b/drivers/firmware/psci.c @@ -61,6 +61,7 @@ bool psci_tos_resident_on(int cpu) struct psci_operations psci_ops = { .conduit = PSCI_CONDUIT_NONE, + .smccc_version = SMCCC_VERSION_1_0, }; typedef unsigned long (psci_fn)(unsigned long, unsigned long, @@ -511,6 +512,31 @@ static void __init psci_init_migrate(void) pr_info("Trusted OS resident on physical CPU 0x%lx\n", cpuid); } +static void __init psci_init_smccc(void) +{ + u32 ver = ARM_SMCCC_VERSION_1_0; + int feature; + + feature = psci_features(ARM_SMCCC_VERSION_FUNC_ID); + + if (feature != PSCI_RET_NOT_SUPPORTED) { + u32 ret; + ret = invoke_psci_fn(ARM_SMCCC_VERSION_FUNC_ID, 0, 0, 0); + if (ret == ARM_SMCCC_VERSION_1_1) { + psci_ops.smccc_version = SMCCC_VERSION_1_1; + ver = ret; + } + } + + /* + * Conveniently, the SMCCC and PSCI versions are encoded the + * same way. No, this isn't accidental. + */ + pr_info("SMC Calling Convention v%d.%d\n", + PSCI_VERSION_MAJOR(ver), PSCI_VERSION_MINOR(ver)); + +} + static void __init psci_0_2_set_functions(void) { pr_info("Using standard PSCI v0.2 function IDs\n"); @@ -559,6 +585,7 @@ static int __init psci_probe(void) psci_init_migrate(); if (PSCI_VERSION_MAJOR(ver) >= 1) { + psci_init_smccc(); psci_init_cpu_suspend(); psci_init_system_suspend(); } diff --git a/include/linux/psci.h b/include/linux/psci.h index 66ff54787d3e..347077cf19c6 100644 --- a/include/linux/psci.h +++ b/include/linux/psci.h @@ -31,6 +31,11 @@ enum psci_conduit { PSCI_CONDUIT_HVC, }; +enum smccc_version { + SMCCC_VERSION_1_0, + SMCCC_VERSION_1_1, +}; + struct psci_operations { u32 (*get_version)(void); int (*cpu_suspend)(u32 state, unsigned long entry_point); @@ -41,6 +46,7 @@ struct psci_operations { unsigned long lowest_affinity_level); int (*migrate_info_type)(void); enum psci_conduit conduit; + enum smccc_version smccc_version; }; extern struct psci_operations psci_ops;