summaryrefslogtreecommitdiffstats
path: root/arch/arm64/include/asm/cpufeature.h
diff options
context:
space:
mode:
authorDave Martin <Dave.Martin@arm.com>2017-10-31 15:51:19 +0000
committerWill Deacon <will.deacon@arm.com>2017-11-03 15:24:21 +0000
commit43994d824e8443263dc98b151e6326bf677be52e (patch)
treeef769d01442f52999428d241b02b0c849489842b /arch/arm64/include/asm/cpufeature.h
parent07d79fe7c22364de34618e58b92a8f091bd7e03d (diff)
downloadop-kernel-dev-43994d824e8443263dc98b151e6326bf677be52e.zip
op-kernel-dev-43994d824e8443263dc98b151e6326bf677be52e.tar.gz
arm64/sve: Detect SVE and activate runtime support
This patch enables detection of hardware SVE support via the cpufeatures framework, and reports its presence to the kernel and userspace via the new ARM64_SVE cpucap and HWCAP_SVE hwcap respectively. Userspace can also detect SVE using ID_AA64PFR0_EL1, using the cpufeatures MRS emulation. When running on hardware that supports SVE, this enables runtime kernel support for SVE, and allows user tasks to execute SVE instructions and make of the of the SVE-specific user/kernel interface extensions implemented by this series. Signed-off-by: Dave Martin <Dave.Martin@arm.com> Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/include/asm/cpufeature.h')
-rw-r--r--arch/arm64/include/asm/cpufeature.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h
index 9b27e8c..ac67cfc 100644
--- a/arch/arm64/include/asm/cpufeature.h
+++ b/arch/arm64/include/asm/cpufeature.h
@@ -273,7 +273,8 @@ static inline bool system_uses_ttbr0_pan(void)
static inline bool system_supports_sve(void)
{
- return false;
+ return IS_ENABLED(CONFIG_ARM64_SVE) &&
+ cpus_have_const_cap(ARM64_SVE);
}
/*
OpenPOWER on IntegriCloud