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 v3 17/42] arm64/sme: Define macros for manually encoding SME instructions
Date: Tue, 19 Oct 2021 18:22:22 +0100 [thread overview]
Message-ID: <20211019172247.3045838-18-broonie@kernel.org> (raw)
In-Reply-To: <20211019172247.3045838-1-broonie@kernel.org>
As with SVE rather than impose ambitious toolchain requirements for SME we
manually encode the few instructions which we require in order to perform
the work the kernel needs to do. That is currently:
- Vector store and load for the ZA array.
- Zeroing of the whole ZA array.
This does not include the SMSTART and SMSTOP instructions which are
single instructions and only used from C code, a later patch will define
them as inline assembly.
Signed-off-by: Mark Brown <broonie@kernel.org>
---
arch/arm64/include/asm/fpsimdmacros.h | 44 +++++++++++++++++++++++++++
1 file changed, 44 insertions(+)
diff --git a/arch/arm64/include/asm/fpsimdmacros.h b/arch/arm64/include/asm/fpsimdmacros.h
index 2509d7dde55a..f9fb5f111758 100644
--- a/arch/arm64/include/asm/fpsimdmacros.h
+++ b/arch/arm64/include/asm/fpsimdmacros.h
@@ -93,6 +93,12 @@
.endif
.endm
+.macro _sme_check_wv v
+ .if (\v) < 12 || (\v) > 15
+ .error "Bad vector select register \v."
+ .endif
+.endm
+
/* SVE instruction encodings for non-SVE-capable assemblers */
/* (pre binutils 2.28, all kernel capable clang versions support SVE) */
@@ -174,6 +180,44 @@
| (\np)
.endm
+/* SME instruction encodings for non-SME-capable assemblers */
+
+/*
+ * STR (vector from ZA array):
+ * STR ZA[\nw, #\offset], [X\nxbase, #\offset, MUL VL]
+ */
+.macro _sme_str_zav nw, nxbase, offset=0
+ _sme_check_wv \nw
+ _check_general_reg \nxbase
+ _check_num (\offset), -0x100, 0xff
+ .inst 0xe1200000 \
+ | (((\nw) & 3) << 13) \
+ | ((\nxbase) << 5) \
+ | ((\offset) & 7)
+.endm
+
+/*
+ * LDR (vector to ZA array):
+ * LDR ZA[\nw, #\offset], [X\nxbase, #\offset, MUL VL]
+ */
+.macro _sme_ldr_zav nw, nxbase, offset=0
+ _sme_check_wv \nw
+ _check_general_reg \nxbase
+ _check_num (\offset), -0x100, 0xff
+ .inst 0xe1000000 \
+ | (((\nw) & 3) << 13) \
+ | ((\nxbase) << 5) \
+ | ((\offset) & 7)
+.endm
+
+/*
+ * Zero the entire ZA array
+ * ZERO ZA
+ */
+.macro zero_za
+ .inst 0xc00800ff
+.endm
+
.macro __for from:req, to:req
.if (\from) == (\to)
_for__body %\from
--
2.30.2
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next prev parent reply other threads:[~2021-10-19 17:35 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-19 17:22 [PATCH v3 00/42] arm64/sme: Initial support for the Scalable Matrix Extension Mark Brown
2021-10-19 17:22 ` [PATCH v3 01/42] arm64/fp: Reindent fpsimd_save() Mark Brown
2021-10-19 17:22 ` [PATCH v3 02/42] arm64/sve: Remove sve_load_from_fpsimd_state() Mark Brown
2021-10-19 17:22 ` [PATCH v3 03/42] arm64/sve: Make sve_state_size() static Mark Brown
2021-10-19 17:22 ` [PATCH v3 04/42] arm64/sve: Make access to FFR optional Mark Brown
2021-10-19 17:22 ` [PATCH v3 05/42] arm64/sve: Rename find_supported_vector_length() Mark Brown
2021-10-19 17:22 ` [PATCH v3 06/42] arm64/sve: Use accessor functions for vector lengths in thread_struct Mark Brown
2021-10-19 17:22 ` [PATCH v3 07/42] arm64/sve: Put system wide vector length information into structs Mark Brown
2021-10-22 11:23 ` Catalin Marinas
2021-10-22 13:49 ` Mark Brown
2021-10-19 17:22 ` [PATCH v3 08/42] arm64/sve: Explicitly load vector length when restoring SVE state Mark Brown
2021-10-19 17:22 ` [PATCH v3 09/42] arm64/sve: Track vector lengths for tasks in an array Mark Brown
2021-10-19 17:22 ` [PATCH v3 10/42] arm64/sve: Make sysctl interface for SVE reusable by SME Mark Brown
2021-10-21 9:55 ` Will Deacon
2021-10-21 12:15 ` Mark Brown
2021-10-19 17:22 ` [PATCH v3 11/42] arm64/sve: Generalise vector length configuration prctl() for SME Mark Brown
2021-10-19 17:22 ` [PATCH v3 12/42] kselftest/arm64: Parameterise ptrace vector length information Mark Brown
2021-10-19 17:22 ` [PATCH v3 13/42] kselftest/arm64: Allow signal tests to trigger from a function Mark Brown
2021-10-19 17:22 ` [PATCH v3 14/42] tools/nolibc: Implement gettid() Mark Brown
2021-10-19 17:22 ` [PATCH v3 15/42] arm64/sme: Provide ABI documentation for SME Mark Brown
2021-10-19 17:22 ` [PATCH v3 16/42] arm64/sme: System register and exception syndrome definitions Mark Brown
2021-10-19 17:22 ` Mark Brown [this message]
2021-10-19 17:22 ` [PATCH v3 18/42] arm64/sme: Early CPU setup for SME Mark Brown
2021-10-19 17:22 ` [PATCH v3 19/42] arm64/sme: Basic enumeration support Mark Brown
2021-10-19 17:22 ` [PATCH v3 20/42] arm64/sme: Identify supported SME vector lengths at boot Mark Brown
2021-10-19 17:22 ` [PATCH v3 21/42] arm64/sme: Implement sysctl to set the default vector length Mark Brown
2021-10-19 17:22 ` [PATCH v3 22/42] arm64/sme: Implement vector length configuration prctl()s Mark Brown
2021-10-19 17:22 ` [PATCH v3 23/42] arm64/sme: Implement support for TPIDR2 Mark Brown
2021-10-19 17:22 ` [PATCH v3 24/42] arm64/sme: Implement SVCR context switching Mark Brown
2021-10-19 17:22 ` [PATCH v3 25/42] arm64/sme: Implement streaming SVE " Mark Brown
2021-10-19 17:22 ` [PATCH v3 26/42] arm64/sme: Implement ZA " Mark Brown
2021-10-19 17:22 ` [PATCH v3 27/42] arm64/sme: Implement traps and syscall handling for SME Mark Brown
2021-10-19 17:22 ` [PATCH v3 28/42] arm64/sme: Implement streaming SVE signal handling Mark Brown
2021-10-19 17:22 ` [PATCH v3 29/42] arm64/sme: Implement ZA " Mark Brown
2021-10-19 17:22 ` [PATCH v3 30/42] arm64/sme: Implement ptrace support for streaming mode SVE registers Mark Brown
2021-10-19 17:22 ` [PATCH v3 31/42] arm64/sme: Add ptrace support for ZA Mark Brown
2021-10-19 17:22 ` [PATCH v3 32/42] arm64/sme: Disable streaming mode and ZA when flushing CPU state Mark Brown
2021-10-19 17:22 ` [PATCH v3 33/42] arm64/sme: Save and restore streaming mode over EFI runtime calls Mark Brown
2021-10-19 17:22 ` [PATCH v3 34/42] arm64/sme: Provide Kconfig for SME Mark Brown
2021-10-19 17:22 ` [PATCH v3 35/42] kselftest/arm64: sme: Add streaming SME support to vlset Mark Brown
2021-10-19 17:22 ` [PATCH v3 36/42] kselftest/arm64: Add tests for TPIDR2 Mark Brown
2021-10-19 17:22 ` [PATCH v3 37/42] kselftest/arm64: Extend vector configuration API tests to cover SME Mark Brown
2021-10-19 17:22 ` [PATCH v3 38/42] kselftest/arm64: sme: Provide streaming mode SVE stress test Mark Brown
2021-10-19 17:22 ` [PATCH v3 39/42] kselftest/arm64: Add stress test for SME ZA context switching Mark Brown
2021-10-19 17:22 ` [PATCH v3 40/42] kselftest/arm64: signal: Add SME signal handling tests Mark Brown
2021-10-19 17:22 ` [PATCH v3 41/42] kselftest/arm64: Add streaming SVE to SVE ptrace tests Mark Brown
2021-10-19 17:22 ` [PATCH v3 42/42] kselftest/arm64: Add coverage for the ZA ptrace interface Mark Brown
2021-10-21 10:05 ` [PATCH v3 00/42] arm64/sme: Initial support for the Scalable Matrix Extension Will Deacon
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