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arm64/sve: Detect SVE and activate runtime support

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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 <[email protected]>
Reviewed-by: Suzuki K Poulose <[email protected]>
Reviewed-by: Catalin Marinas <[email protected]>
Signed-off-by: Will Deacon <[email protected]>
This commit is contained in:
Dave Martin 2017-10-31 15:51:19 +00:00 • committed by Will Deacon
commit 43994d824e
8 changed files with 36 additions and 6 deletions
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6
Documentation/arm64/cpu-feature-registers.txt
View file

@ -142,7 +142,11 @@ infrastructure:
x--------------------------------------------------x
| Name | bits | visible |
|--------------------------------------------------|
| RES0 | [63-28] | n |
| RES0 | [63-36] | n |
|--------------------------------------------------|
| SVE | [35-32] | y |
|--------------------------------------------------|
| RES0 | [31-28] | n |
|--------------------------------------------------|
| GIC | [27-24] | n |
|--------------------------------------------------|

4
Documentation/arm64/elf_hwcaps.txt
View file

@ -154,3 +154,7 @@ HWCAP_ASIMDDP
HWCAP_SHA512
Functionality implied by ID_AA64ISAR0_EL1.SHA2 == 0b0002.
HWCAP_SVE
Functionality implied by ID_AA64PFR0_EL1.SVE == 0b0001.