Expose a HWCAP and ID_AA64MMFR3_EL1_S1POE to userspace, so they can be used to
check if the CPU supports the feature.

Signed-off-by: Joey Gouly <joey.gouly@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
---

This takes the last bit of HWCAP2, is this fine? What can we do about more features in the future?


 Documentation/arch/arm64/elf_hwcaps.rst |  2 ++
 arch/arm64/include/asm/hwcap.h          |  1 +
 arch/arm64/include/uapi/asm/hwcap.h     |  1 +
 arch/arm64/kernel/cpufeature.c          | 14 ++++++++++++++
 arch/arm64/kernel/cpuinfo.c             |  1 +
 5 files changed, 19 insertions(+)

diff --git a/Documentation/arch/arm64/elf_hwcaps.rst b/Documentation/arch/arm64/elf_hwcaps.rst
index 448c1664879b..694f67fa07d1 100644
--- a/Documentation/arch/arm64/elf_hwcaps.rst
+++ b/Documentation/arch/arm64/elf_hwcaps.rst

@@ -365,6 +365,8 @@ HWCAP2_SME_SF8DP2
 HWCAP2_SME_SF8DP4
     Functionality implied by ID_AA64SMFR0_EL1.SF8DP4 == 0b1.
 
+HWCAP2_POE
+    Functionality implied by ID_AA64MMFR3_EL1.S1POE == 0b0001.