[PATCH v5 10/30] arm64/sve: Kconfig update and conditional compilation support

Dave Martin
2017-10-31T15:51:02Z

This patch adds CONFIG_ARM64_SVE to control building of SVE support
into the kernel, and adds a stub predicate system_supports_sve() to
control conditional compilation and runtime SVE support.

system_supports_sve() just returns false for now: it will be
replaced with a non-trivial implementation in a later patch, once
SVE support is complete enough to be enabled safely.

Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
---
arch/arm64/Kconfig | 11 +++++++++++
arch/arm64/include/asm/cpufeature.h | 5 +++++
2 files changed, 16 insertions(+)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 5cfb79d..1046074 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -976,6 +976,17 @@ config ARM64_PMEM

endmenu

+config ARM64_SVE
+ bool "ARM Scalable Vector Extension support"
+ default y
+ help
+ The Scalable Vector Extension (SVE) is an extension to the AArch64
+ execution state which complements and extends the SIMD functionality
+ of the base architecture to support much larger vectors and to enable
+ additional vectorisation opportunities.
+
+ To enable use of this extension on CPUs that implement it, say Y.
+
config ARM64_MODULE_CMODEL_LARGE
bool

diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h
index 428ee1f..4ea3441 100644
--- a/arch/arm64/include/asm/cpufeature.h
+++ b/arch/arm64/include/asm/cpufeature.h
@@ -262,6 +262,11 @@ static inline bool system_uses_ttbr0_pan(void)
!cpus_have_const_cap(ARM64_HAS_PAN);
}

+static inline bool system_supports_sve(void)
+{
+ return false;
+}
+
#endif /* __ASSEMBLY__ */

#endif
--
2.1.4