arm64/sve: Kconfig update and conditional compilation support (ddd25ad1) · Commits · 戴 / test

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> Signed-off-by:

Will Deacon <will.deacon@arm.com>

arch/arm64/Kconfig

+11 −0

Original line number	Diff line number	Diff line
		@@ -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

arch/arm64/include/asm/cpufeature.h

+5 −0

Original line number	Diff line number	Diff line
		@@ -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

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