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 v5 13/38] arm64/sme: Early CPU setup for SME
Date: Wed, 27 Oct 2021 19:43:59 +0100 [thread overview]
Message-ID: <20211027184424.166237-14-broonie@kernel.org> (raw)
In-Reply-To: <20211027184424.166237-1-broonie@kernel.org>
SME requires similar setup to that for SVE: disable traps to EL2 and
make sure that the maximum vector length is available to EL1, for SME we
have two traps - one for SME itself and one for TPIDR2.
In addition since we currently make no active use of priority control
for SCMUs we map all SME priorities lower ELs may configure to 0, the
architecture specified minimum priority, to ensure that nothing we
manage is able to configure itself to consume excessive resources. This
will need to be revisited should there be a need to manage SME
priorities at runtime.
Signed-off-by: Mark Brown <broonie@kernel.org>
---
arch/arm64/include/asm/el2_setup.h | 45 ++++++++++++++++++++++++++++++
1 file changed, 45 insertions(+)
diff --git a/arch/arm64/include/asm/el2_setup.h b/arch/arm64/include/asm/el2_setup.h
index 3198acb2aad8..ea13041a2392 100644
--- a/arch/arm64/include/asm/el2_setup.h
+++ b/arch/arm64/include/asm/el2_setup.h
@@ -143,6 +143,50 @@
.Lskip_sve_\@:
.endm
+/* SME register access and priority mapping */
+.macro __init_el2_nvhe_sme
+ mrs x1, id_aa64pfr1_el1
+ ubfx x1, x1, #ID_AA64PFR1_SME_SHIFT, #4
+ cbz x1, .Lskip_sme_\@
+
+ bic x0, x0, #CPTR_EL2_TSM // Also disable SME traps
+ msr cptr_el2, x0 // Disable copro. traps to EL2
+ isb
+
+ mrs x1, sctlr_el2
+ orr x1, x1, #SCTLR_ELx_ENTP2 // Disable TPIDR2 traps
+ msr sctlr_el2, x1
+ isb
+
+ mov x1, #0 // SMCR controls
+
+ mrs_s x2, SYS_ID_AA64SMFR0_EL1
+ ubfx x2, x2, #ID_AA64SMFR0_FA64_SHIFT, #1 // Full FP in SM?
+ cbz x2, .Lskip_sme_fa64_\@
+
+ orr x1, x1, SMCR_ELx_FA64_MASK
+.Lskip_sme_fa64_\@:
+
+ orr x1, x1, #SMCR_ELx_LEN_MASK // Enable full SME vector
+ msr_s SYS_SMCR_EL2, x1 // length for EL1.
+
+ mrs_s x1, SYS_SMIDR_EL1 // Priority mapping supported?
+ ubfx x1, x1, #SYS_SMIDR_EL1_SMPS_SHIFT, #1
+ cbz x1, .Lskip_sme_\@
+
+ msr_s SYS_SMPRIMAP_EL2, xzr // Make all priorities equal
+
+ mrs x1, id_aa64mmfr1_el1 // HCRX_EL2 present?
+ ubfx x1, x1, #ID_AA64MMFR1_HCX_SHIFT, #4
+ cbz x1, .Lskip_sme_\@
+
+ mrs_s x1, SYS_HCRX_EL2
+ orr x1, x1, #HCRX_EL2_SMPME_MASK // Enable priority mapping
+ msr_s SYS_HCRX_EL2, x1
+
+.Lskip_sme_\@:
+.endm
+
/* Disable any fine grained traps */
.macro __init_el2_fgt
mrs x1, id_aa64mmfr0_el1
@@ -196,6 +240,7 @@
__init_el2_nvhe_idregs
__init_el2_nvhe_cptr
__init_el2_nvhe_sve
+ __init_el2_nvhe_sme
__init_el2_fgt
__init_el2_nvhe_prepare_eret
.endm
--
2.30.2
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next prev parent reply other threads:[~2021-10-27 18:58 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-27 18:43 [PATCH v5 00/38] arm64/sme: Initial support for the Scalable Matrix Extension Mark Brown
2021-10-27 18:43 ` [PATCH v5 01/38] arm64/sve: Make sysctl interface for SVE reusable by SME Mark Brown
2021-10-27 18:43 ` [PATCH v5 02/38] arm64/sve: Generalise vector length configuration prctl() for SME Mark Brown
2021-10-27 18:43 ` [PATCH v5 03/38] arm64/sve: Minor clarification of ABI documentation Mark Brown
2021-10-27 18:43 ` [PATCH v5 04/38] kselftest/arm64: Parameterise ptrace vector length information Mark Brown
2021-10-27 18:43 ` [PATCH v5 05/38] kselftest/arm64: Allow signal tests to trigger from a function Mark Brown
2021-10-27 18:43 ` [PATCH v5 06/38] kselftest/arm64: Add a test program to exercise the syscall ABI Mark Brown
2021-10-27 18:43 ` [PATCH v5 07/38] tools/nolibc: Implement gettid() Mark Brown
2021-10-27 18:43 ` [PATCH v5 08/38] arm64: Document boot requirements for FEAT_SME_FA64 Mark Brown
2021-10-27 18:43 ` [PATCH v5 09/38] arm64: cpufeature: Add has_feature_flag() match function Mark Brown
2021-10-27 18:43 ` [PATCH v5 10/38] arm64/sme: Provide ABI documentation for SME Mark Brown
2021-10-27 18:43 ` [PATCH v5 11/38] arm64/sme: System register and exception syndrome definitions Mark Brown
2021-10-27 18:43 ` [PATCH v5 12/38] arm64/sme: Define macros for manually encoding SME instructions Mark Brown
2021-10-27 18:43 ` Mark Brown [this message]
2021-10-27 18:44 ` [PATCH v5 14/38] arm64/sme: Basic enumeration support Mark Brown
2021-10-27 18:44 ` [PATCH v5 15/38] arm64/sme: Identify supported SME vector lengths at boot Mark Brown
2021-10-27 18:44 ` [PATCH v5 16/38] arm64/sme: Implement sysctl to set the default vector length Mark Brown
2021-10-27 18:44 ` [PATCH v5 17/38] arm64/sme: Implement vector length configuration prctl()s Mark Brown
2021-10-27 18:44 ` [PATCH v5 18/38] arm64/sme: Implement support for TPIDR2 Mark Brown
2021-10-27 18:44 ` [PATCH v5 19/38] arm64/sme: Implement SVCR context switching Mark Brown
2021-10-27 18:44 ` [PATCH v5 20/38] arm64/sme: Implement streaming SVE " Mark Brown
2021-10-27 18:44 ` [PATCH v5 21/38] arm64/sme: Implement ZA " Mark Brown
2021-10-27 18:44 ` [PATCH v5 22/38] arm64/sme: Implement traps and syscall handling for SME Mark Brown
2021-10-27 18:44 ` [PATCH v5 23/38] arm64/sme: Implement streaming SVE signal handling Mark Brown
2021-10-27 18:44 ` [PATCH v5 24/38] arm64/sme: Implement ZA " Mark Brown
2021-10-27 18:44 ` [PATCH v5 25/38] arm64/sme: Implement ptrace support for streaming mode SVE registers Mark Brown
2021-10-27 18:44 ` [PATCH v5 26/38] arm64/sme: Add ptrace support for ZA Mark Brown
2021-10-27 18:44 ` [PATCH v5 27/38] arm64/sme: Disable streaming mode and ZA when flushing CPU state Mark Brown
2021-10-27 18:44 ` [PATCH v5 28/38] arm64/sme: Save and restore streaming mode over EFI runtime calls Mark Brown
2021-10-27 18:44 ` [PATCH v5 29/38] arm64/sme: Provide Kconfig for SME Mark Brown
2021-10-27 18:44 ` [PATCH v5 30/38] kselftest/arm64: sme: Add streaming SME support to vlset Mark Brown
2021-10-27 18:44 ` [PATCH v5 31/38] kselftest/arm64: Add tests for TPIDR2 Mark Brown
2021-10-27 18:44 ` [PATCH v5 32/38] kselftest/arm64: Extend vector configuration API tests to cover SME Mark Brown
2021-10-27 18:44 ` [PATCH v5 33/38] kselftest/arm64: sme: Provide streaming mode SVE stress test Mark Brown
2021-10-27 18:44 ` [PATCH v5 34/38] kselftest/arm64: Add stress test for SME ZA context switching Mark Brown
2021-10-27 18:44 ` [PATCH v5 35/38] kselftest/arm64: signal: Add SME signal handling tests Mark Brown
2021-10-27 18:44 ` [PATCH v5 36/38] kselftest/arm64: Add streaming SVE to SVE ptrace tests Mark Brown
2021-10-27 18:44 ` [PATCH v5 37/38] kselftest/arm64: Add coverage for the ZA ptrace interface Mark Brown
2021-10-27 18:44 ` [PATCH v5 38/38] kselftest/arm64: Add SME support to syscall ABI test Mark Brown
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