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firmware: smccc: Add HAVE_ARM_SMCCC_DISCOVERY to identify SMCCC v1.1 and above

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SMCCC v1.0 lacked discoverability of version and features. To accelerate
adoption of few mitigations and protect systems more rapidly from various
vulnerability, PSCI v1.0 was updated to add SMCCC discovery mechanism
though the PSCI firmware implementation of PSCI_FEATURES(SMCCC_VERSION)
which returns success on firmware compliant to SMCCC v1.1 and above.

This inturn makes SMCCC v1.1 and above dependent on ARM_PSCI_FW for
backward compatibility. Let us introduce a new hidden config for the
same to build more features on top of SMCCC v1.1 and above.

While at it, also sort alphabetically the psci entry.

Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Tested-by: Etienne Carriere <etienne.carriere@st.com>
Reviewed-by: Etienne Carriere <etienne.carriere@st.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Link: https://lore.kernel.org/r/20200518091222.27467-2-sudeep.holla@arm.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Sudeep Holla 2020-05-18 10:12:16 +01:00 committed by Will Deacon
parent 6a8b55ed40
commit e5bfb21d98
2 changed files with 18 additions and 4 deletions
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6
drivers/firmware/Kconfig
View File

@ -295,15 +295,13 @@ config TURRIS_MOX_RWTM
other manufacturing data and also utilize the Entropy Bit Generator
for hardware random number generation.
config HAVE_ARM_SMCCC
bool
source "drivers/firmware/psci/Kconfig"
source "drivers/firmware/broadcom/Kconfig"
source "drivers/firmware/google/Kconfig"
source "drivers/firmware/efi/Kconfig"
source "drivers/firmware/imx/Kconfig"
source "drivers/firmware/meson/Kconfig"
source "drivers/firmware/psci/Kconfig"
source "drivers/firmware/smccc/Kconfig"
source "drivers/firmware/tegra/Kconfig"
source "drivers/firmware/xilinx/Kconfig"

16
drivers/firmware/smccc/Kconfig Normal file
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@ -0,0 +1,16 @@
# SPDX-License-Identifier: GPL-2.0-only
config HAVE_ARM_SMCCC
bool
help
Include support for the Secure Monitor Call (SMC) and Hypervisor
Call (HVC) instructions on Armv7 and above architectures.
config HAVE_ARM_SMCCC_DISCOVERY
bool
depends on ARM_PSCI_FW
default y
help
SMCCC v1.0 lacked discoverability and hence PSCI v1.0 was updated
to add SMCCC discovery mechanism though the PSCI firmware
implementation of PSCI_FEATURES(SMCCC_VERSION) which returns
success on firmware compliant to SMCCC v1.1 and above.