diff mbox series

[v2,34/42] arm64/sme: Provide Kconfig for SME

Message ID	20211018190858.2119209-35-broonie@kernel.org (mailing list archive)
State	New
Headers	show Return-Path: <linux-kselftest-owner@kernel.org> From: Mark Brown <broonie@kernel.org> To: Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will@kernel.org>, Shuah Khan <skhan@linuxfoundation.org>, Shuah Khan <shuah@kernel.org> Cc: Alan Hayward <alan.hayward@arm.com>, Luis Machado <luis.machado@arm.com>, Salil Akerkar <Salil.Akerkar@arm.com>, Basant Kumar Dwivedi <Basant.KumarDwivedi@arm.com>, Szabolcs Nagy <szabolcs.nagy@arm.com>, linux-arm-kernel@lists.infradead.org, linux-kselftest@vger.kernel.org, Mark Brown <broonie@kernel.org> Subject: [PATCH v2 34/42] arm64/sme: Provide Kconfig for SME Date: Mon, 18 Oct 2021 20:08:50 +0100 Message-Id: <20211018190858.2119209-35-broonie@kernel.org> In-Reply-To: <20211018190858.2119209-1-broonie@kernel.org> References: <20211018190858.2119209-1-broonie@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk
Series	arm64/sme: Initial support for the Scalable Matrix Extension \| expand [v2,00/42] arm64/sme: Initial support for the Scalable Matrix Extension [v2,01/42] arm64/fp: Reindent fpsimd_save() [v2,02/42] arm64/sve: Remove sve_load_from_fpsimd_state() [v2,03/42] arm64/sve: Make sve_state_size() static [v2,04/42] arm64/sve: Make access to FFR optional [v2,05/42] arm64/sve: Rename find_supported_vector_length() [v2,06/42] arm64/sve: Use accessor functions for vector lengths in thread_struct [v2,07/42] arm64/sve: Put system wide vector length information into structs [v2,08/42] arm64/sve: Explicitly load vector length when restoring SVE state [v2,09/42] arm64/sve: Track vector lengths for tasks in an array [v2,10/42] arm64/sve: Make sysctl interface for SVE reusable by SME [v2,11/42] arm64/sve: Generalise vector length configuration prctl() for SME [v2,12/42] kselftest/arm64: Parameterise ptrace vector length information [v2,13/42] kselftest/arm64: Allow signal tests to trigger from a function [v2,14/42] tools/nolibc: Implement gettid() [v2,15/42] arm64/sme: Provide ABI documentation for SME [v2,16/42] arm64/sme: System register and exception syndrome definitions [v2,17/42] arm64/sme: Define macros for manually encoding SME instructions [v2,18/42] arm64/sme: Early CPU setup for SME [v2,19/42] arm64/sme: Basic enumeration support [v2,20/42] arm64/sme: Identify supported SME vector lengths at boot [v2,21/42] arm64/sme: Implement sysctl to set the default vector length [v2,22/42] arm64/sme: Implement vector length configuration prctl()s [v2,23/42] arm64/sme: Implement support for TPIDR2 [v2,24/42] arm64/sme: Implement SVCR context switching [v2,25/42] arm64/sme: Implement streaming SVE context switching [v2,26/42] arm64/sme: Implement ZA context switching [v2,27/42] arm64/sme: Implement traps and syscall handling for SME [v2,28/42] arm64/sme: Implement streaming SVE signal handling [v2,29/42] arm64/sme: Implement ZA signal handling [v2,30/42] arm64/sme: Implement ptrace support for streaming mode SVE registers [v2,31/42] arm64/sme: Add ptrace support for ZA [v2,32/42] arm64/sme: Disable streaming mode and ZA when flushing CPU state [v2,33/42] arm64/sme: Save and restore streaming mode over EFI runtime calls [v2,34/42] arm64/sme: Provide Kconfig for SME [v2,35/42] kselftest/arm64: sme: Add streaming SME support to vlset [v2,36/42] kselftest/arm64: Add tests for TPIDR2 [v2,37/42] kselftest/arm64: Extend vector configuration API tests to cover SME [v2,38/42] kselftest/arm64: sme: Provide streaming mode SVE stress test [v2,39/42] kselftest/arm64: Add stress test for SME ZA context switching [v2,40/42] kselftest/arm64: signal: Add SME signal handling tests [v2,41/42] kselftest/arm64: Add streaming SVE to SVE ptrace tests [v2,42/42] kselftest/arm64: Add coverage for the ZA ptrace interface

Commit Message

Mark Brown Oct. 18, 2021, 7:08 p.m. UTC

Now that basline support for the Scalable Matrix Extension (SME) is present
introduce the Kconfig option allowing it to be built. While there is no
requirement for a system with SME to support SVE at runtime the support for
streaming mode SVE is mostly shared with normal SVE so depend on SVE.

Since there is currently no support for KVM and no handling of either
streaming mode or ZA with KVM the option the feature is marked as being
incompatible with KVM and not enabled by default.

Signed-off-by: Mark Brown <broonie@kernel.org>
---
 arch/arm64/Kconfig | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff mbox series

Patch

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 5c7ae4c3954b..f7004dd0a1b4 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -1719,6 +1719,17 @@  config ARM64_SVE
 	  booting the kernel.  If unsure and you are not observing these
 	  symptoms, you should assume that it is safe to say Y.
 
+config ARM64_SME
+	bool "ARM Scalable Matrix Extension support"
+	depends on ARM64_SVE
+	depends on !KVM
+	help
+	  The Scalable Matrix Extension (SME) is an extension to the AArch64
+	  execution state which utilises a substantial subset of the SVE
+	  instruction set, together with the addition of new architectural
+	  register state capable of holding two dimensional matrix tiles to
+	  enable various matrix operations.
+
 config ARM64_MODULE_PLTS
 	bool "Use PLTs to allow module memory to spill over into vmalloc area"
 	depends on MODULES