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charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20240719-xtheadvector-v5-1-4b485fc7d55f@rivosinc.com> References: <20240719-xtheadvector-v5-0-4b485fc7d55f@rivosinc.com> In-Reply-To: <20240719-xtheadvector-v5-0-4b485fc7d55f@rivosinc.com> To: Conor Dooley , Rob Herring , Krzysztof Kozlowski , Paul Walmsley , Palmer Dabbelt , Albert Ou , Jisheng Zhang , Chen-Yu Tsai , Jernej Skrabec , Samuel Holland , Samuel Holland , Jonathan Corbet , Shuah Khan , Guo Ren , Evan Green , Andy Chiu , Jessica Clarke Cc: linux-riscv@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-sunxi@lists.linux.dev, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, Charlie Jenkins , Conor Dooley X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=ed25519-sha256; t=1721405940; l=1788; i=charlie@rivosinc.com; s=20231120; h=from:subject:message-id; bh=ZzH0VgSdYutk/uKY2omj651o9v+E5HP1BijtgXJzAp0=; b=rsQNwNk/nGw07WypZ0WFD3o9JfwjjscYkiNaMlQ+k6T5GEeUL6lGIKjpeR+owwiCEdCVico/6 whuYOjwhUL5CLoFlffJhH8svBTCXqBxdop2d5EsODMFY81AqvwP2Mwf X-Developer-Key: i=charlie@rivosinc.com; a=ed25519; pk=t4RSWpMV1q5lf/NWIeR9z58bcje60/dbtxxmoSfBEcs= The xtheadvector ISA extension is described on the T-Head extension spec Github page [1] at commit 95358cb2cca9. Link: https://github.com/T-head-Semi/thead-extension-spec/blob/95358cb2cca9= 489361c61d335e03d3134b14133f/xtheadvector.adoc [1] Signed-off-by: Charlie Jenkins Reviewed-by: Conor Dooley --- Documentation/devicetree/bindings/riscv/extensions.yaml | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/Documentation/devicetree/bindings/riscv/extensions.yaml b/Docu= mentation/devicetree/bindings/riscv/extensions.yaml index a06dbc6b4928..1a3d01aedde6 100644 --- a/Documentation/devicetree/bindings/riscv/extensions.yaml +++ b/Documentation/devicetree/bindings/riscv/extensions.yaml @@ -556,6 +556,10 @@ properties: latency, as ratified in commit 56ed795 ("Update riscv-crypto-spec-vector.adoc") of riscv-crypto. =20 + # vendor extensions, each extension sorted alphanumerically under = the + # vendor they belong to. Vendors are sorted alphanumerically as we= ll. + + # Andes - const: xandespmu description: The Andes Technology performance monitor extension for counter= overflow @@ -563,6 +567,12 @@ properties: Registers in the AX45MP datasheet. https://www.andestech.com/wp-content/uploads/AX45MP-1C-Rev.-5.= 0.0-Datasheet.pdf =20 + # T-HEAD + - const: xtheadvector + description: + The T-HEAD specific 0.7.1 vector implementation as written in + https://github.com/T-head-Semi/thead-extension-spec/blob/95358= cb2cca9489361c61d335e03d3134b14133f/xtheadvector.adoc. + allOf: # Zcb depends on Zca - if: --=20 2.44.0 From nobody Fri Dec 19 05:36:45 2025 Received: from mail-pf1-f171.google.com (mail-pf1-f171.google.com [209.85.210.171]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2EFF014659D for ; Fri, 19 Jul 2024 16:19:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.171 ARC-Seal: i=1; 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Fri, 19 Jul 2024 09:19:06 -0700 (PDT) Received: from charlie.ba.rivosinc.com ([64.71.180.162]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-1fd6f490dcbsm6461435ad.297.2024.07.19.09.19.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 19 Jul 2024 09:19:05 -0700 (PDT) From: Charlie Jenkins Date: Fri, 19 Jul 2024 09:18:57 -0700 Subject: [PATCH v5 02/13] dt-bindings: cpus: add a thead vlen register length property Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20240719-xtheadvector-v5-2-4b485fc7d55f@rivosinc.com> References: <20240719-xtheadvector-v5-0-4b485fc7d55f@rivosinc.com> In-Reply-To: <20240719-xtheadvector-v5-0-4b485fc7d55f@rivosinc.com> To: Conor Dooley , Rob Herring , Krzysztof Kozlowski , Paul Walmsley , Palmer Dabbelt , Albert Ou , Jisheng Zhang , Chen-Yu Tsai , Jernej Skrabec , Samuel Holland , Samuel Holland , Jonathan Corbet , Shuah Khan , Guo Ren , Evan Green , Andy Chiu , Jessica Clarke Cc: linux-riscv@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-sunxi@lists.linux.dev, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, Charlie Jenkins , Conor Dooley X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=ed25519-sha256; t=1721405940; l=1911; i=charlie@rivosinc.com; s=20231120; h=from:subject:message-id; bh=lK25kSvuXBbjCsm1KOScKY69sa4rMHinL5Ye8aockR0=; b=vw3ii77Xw15MDoMhfXizqGACv7IxGNe+JbN5fE16N5Xx1rFH9BejYgL8yDj9OHaqBl1IRVuc9 e+QVMtkstlhD4KgcoWg7ljr5hN0kd/hJvXchgNzP2IOQ3m7fneQUjL0 X-Developer-Key: i=charlie@rivosinc.com; a=ed25519; pk=t4RSWpMV1q5lf/NWIeR9z58bcje60/dbtxxmoSfBEcs= Add a property analogous to the vlenb CSR so that software can detect the vector length of each CPU prior to it being brought online. Currently software has to assume that the vector length read from the boot CPU applies to all possible CPUs. On T-Head CPUs implementing pre-ratification vector, reading the th.vlenb CSR may produce an illegal instruction trap, so this property is required on such systems. Signed-off-by: Charlie Jenkins Reviewed-by: Conor Dooley --- Documentation/devicetree/bindings/riscv/cpus.yaml | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/Documentation/devicetree/bindings/riscv/cpus.yaml b/Documentat= ion/devicetree/bindings/riscv/cpus.yaml index 8edc8261241a..c0cf6cf56749 100644 --- a/Documentation/devicetree/bindings/riscv/cpus.yaml +++ b/Documentation/devicetree/bindings/riscv/cpus.yaml @@ -26,6 +26,18 @@ description: | allOf: - $ref: /schemas/cpu.yaml# - $ref: extensions.yaml + - if: + not: + properties: + compatible: + contains: + enum: + - thead,c906 + - thead,c910 + - thead,c920 + then: + properties: + thead,vlenb: false =20 properties: compatible: @@ -95,6 +107,13 @@ properties: description: The blocksize in bytes for the Zicboz cache operations. =20 + thead,vlenb: + $ref: /schemas/types.yaml#/definitions/uint32 + description: + VLEN/8, the vector register length in bytes. 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Fri, 19 Jul 2024 09:19:07 -0700 (PDT) From: Charlie Jenkins Date: Fri, 19 Jul 2024 09:18:58 -0700 Subject: [PATCH v5 03/13] riscv: dts: allwinner: Add xtheadvector to the D1/D1s devicetree Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20240719-xtheadvector-v5-3-4b485fc7d55f@rivosinc.com> References: <20240719-xtheadvector-v5-0-4b485fc7d55f@rivosinc.com> In-Reply-To: <20240719-xtheadvector-v5-0-4b485fc7d55f@rivosinc.com> To: Conor Dooley , Rob Herring , Krzysztof Kozlowski , Paul Walmsley , Palmer Dabbelt , Albert Ou , Jisheng Zhang , Chen-Yu Tsai , Jernej Skrabec , Samuel Holland , Samuel Holland , Jonathan Corbet , Shuah Khan , Guo Ren , Evan Green , Andy Chiu , Jessica Clarke Cc: linux-riscv@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-sunxi@lists.linux.dev, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, Charlie Jenkins , Conor Dooley X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=ed25519-sha256; t=1721405940; l=960; i=charlie@rivosinc.com; s=20231120; h=from:subject:message-id; bh=I9BB6+DSsEot7edtm0hreUvYP0RvytEdbSv790C0uE4=; b=sngfflM5nSLL/9h3hkVIPkIG+9hFUZXHyVmtvYEqQE6t7Z9mbcoiiQMzdG9oZa1acy9OwwhRE fH5wzGZXreIDIJjAuA2dBNMbHed2lJBKOXFbMRmO5XQL9nGC0jjFrsq X-Developer-Key: i=charlie@rivosinc.com; a=ed25519; pk=t4RSWpMV1q5lf/NWIeR9z58bcje60/dbtxxmoSfBEcs= The D1/D1s SoCs support xtheadvector so it can be included in the devicetree. Also include vlenb for the cpu. Signed-off-by: Charlie Jenkins Reviewed-by: Conor Dooley --- arch/riscv/boot/dts/allwinner/sun20i-d1s.dtsi | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/riscv/boot/dts/allwinner/sun20i-d1s.dtsi b/arch/riscv/boo= t/dts/allwinner/sun20i-d1s.dtsi index 64c3c2e6cbe0..6367112e614a 100644 --- a/arch/riscv/boot/dts/allwinner/sun20i-d1s.dtsi +++ b/arch/riscv/boot/dts/allwinner/sun20i-d1s.dtsi @@ -27,7 +27,8 @@ cpu0: cpu@0 { riscv,isa =3D "rv64imafdc"; riscv,isa-base =3D "rv64i"; riscv,isa-extensions =3D "i", "m", "a", "f", "d", "c", "zicntr", "zicsr= ", - "zifencei", "zihpm"; + "zifencei", "zihpm", "xtheadvector"; + thead,vlenb =3D <128>; #cooling-cells =3D <2>; =20 cpu0_intc: interrupt-controller { --=20 2.44.0 From nobody Fri Dec 19 05:36:46 2025 Received: from mail-pl1-f173.google.com (mail-pl1-f173.google.com [209.85.214.173]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 322BD146D78 for ; 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Fri, 19 Jul 2024 09:19:10 -0700 (PDT) Received: from charlie.ba.rivosinc.com ([64.71.180.162]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-1fd6f490dcbsm6461435ad.297.2024.07.19.09.19.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 19 Jul 2024 09:19:09 -0700 (PDT) From: Charlie Jenkins Date: Fri, 19 Jul 2024 09:18:59 -0700 Subject: [PATCH v5 04/13] riscv: Add thead and xtheadvector as a vendor extension Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20240719-xtheadvector-v5-4-4b485fc7d55f@rivosinc.com> References: <20240719-xtheadvector-v5-0-4b485fc7d55f@rivosinc.com> In-Reply-To: <20240719-xtheadvector-v5-0-4b485fc7d55f@rivosinc.com> To: Conor Dooley , Rob Herring , Krzysztof Kozlowski , Paul Walmsley , Palmer Dabbelt , Albert Ou , Jisheng Zhang , Chen-Yu Tsai , Jernej Skrabec , Samuel Holland , Samuel Holland , Jonathan Corbet , Shuah Khan , Guo Ren , Evan Green , Andy Chiu , Jessica Clarke Cc: linux-riscv@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-sunxi@lists.linux.dev, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, Charlie Jenkins , Conor Dooley X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=ed25519-sha256; t=1721405940; l=5053; i=charlie@rivosinc.com; s=20231120; h=from:subject:message-id; bh=M+1BS68dt7Jh5BDKNUbAmq4jayBxd0dfxnDuF0LILQU=; b=ZSmWhsyqvbJIyDN7h9xvm46Zg/931UNHVSUHQxzLFFeJr2k8aS3IR0sMkQuimETs3iQ1GmGF5 W6UtdCuPpbaD9SpovbUHo29wn8GglJ9bV6wA6WH3OEIq3pD52j4FAaB X-Developer-Key: i=charlie@rivosinc.com; a=ed25519; pk=t4RSWpMV1q5lf/NWIeR9z58bcje60/dbtxxmoSfBEcs= Add support to the kernel for THead vendor extensions with the target of the new extension xtheadvector. Signed-off-by: Charlie Jenkins Reviewed-by: Conor Dooley --- arch/riscv/Kconfig.vendor | 13 +++++++++++++ arch/riscv/include/asm/vendor_extensions/thead.h | 16 ++++++++++++++++ arch/riscv/kernel/cpufeature.c | 1 + arch/riscv/kernel/vendor_extensions.c | 10 ++++++++++ arch/riscv/kernel/vendor_extensions/Makefile | 1 + arch/riscv/kernel/vendor_extensions/thead.c | 18 ++++++++++++++++++ 6 files changed, 59 insertions(+) diff --git a/arch/riscv/Kconfig.vendor b/arch/riscv/Kconfig.vendor index 6f1cdd32ed29..9897442bd44f 100644 --- a/arch/riscv/Kconfig.vendor +++ b/arch/riscv/Kconfig.vendor @@ -16,4 +16,17 @@ config RISCV_ISA_VENDOR_EXT_ANDES If you don't know what to do here, say Y. endmenu =20 +menu "T-Head" +config RISCV_ISA_VENDOR_EXT_THEAD + bool "T-Head vendor extension support" + select RISCV_ISA_VENDOR_EXT + default y + help + Say N here to disable detection of and support for all T-Head vendor + extensions. Without this option enabled, T-Head vendor extensions will + not be detected at boot and their presence not reported to userspace. + + If you don't know what to do here, say Y. +endmenu + endmenu diff --git a/arch/riscv/include/asm/vendor_extensions/thead.h b/arch/riscv/= include/asm/vendor_extensions/thead.h new file mode 100644 index 000000000000..48421d1553ad --- /dev/null +++ b/arch/riscv/include/asm/vendor_extensions/thead.h @@ -0,0 +1,16 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_RISCV_VENDOR_EXTENSIONS_THEAD_H +#define _ASM_RISCV_VENDOR_EXTENSIONS_THEAD_H + +#include + +#include + +/* + * Extension keys must be strictly less than RISCV_ISA_VENDOR_EXT_MAX. + */ +#define RISCV_ISA_VENDOR_EXT_XTHEADVECTOR 0 + +extern struct riscv_isa_vendor_ext_data_list riscv_isa_vendor_ext_list_the= ad; + +#endif diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c index 271bb0917fcb..041e5e8f8312 100644 --- a/arch/riscv/kernel/cpufeature.c +++ b/arch/riscv/kernel/cpufeature.c @@ -25,6 +25,7 @@ #include #include #include +#include =20 #define NUM_ALPHA_EXTS ('z' - 'a' + 1) =20 diff --git a/arch/riscv/kernel/vendor_extensions.c b/arch/riscv/kernel/vend= or_extensions.c index b6c1e7b5d34b..662ba64a8f93 100644 --- a/arch/riscv/kernel/vendor_extensions.c +++ b/arch/riscv/kernel/vendor_extensions.c @@ -6,6 +6,7 @@ #include #include #include +#include =20 #include #include @@ -14,6 +15,9 @@ struct riscv_isa_vendor_ext_data_list *riscv_isa_vendor_e= xt_list[] =3D { #ifdef CONFIG_RISCV_ISA_VENDOR_EXT_ANDES &riscv_isa_vendor_ext_list_andes, #endif +#ifdef CONFIG_RISCV_ISA_VENDOR_EXT_THEAD + &riscv_isa_vendor_ext_list_thead, +#endif }; =20 const size_t riscv_isa_vendor_ext_list_size =3D ARRAY_SIZE(riscv_isa_vendo= r_ext_list); @@ -41,6 +45,12 @@ bool __riscv_isa_vendor_extension_available(int cpu, uns= igned long vendor, unsig cpu_bmap =3D &riscv_isa_vendor_ext_list_andes.per_hart_isa_bitmap[cpu]; break; #endif + #ifdef CONFIG_RISCV_ISA_VENDOR_EXT_THEAD + case THEAD_VENDOR_ID: + bmap =3D &riscv_isa_vendor_ext_list_thead.all_harts_isa_bitmap; + cpu_bmap =3D &riscv_isa_vendor_ext_list_thead.per_hart_isa_bitmap[cpu]; + break; + #endif default: return false; } diff --git a/arch/riscv/kernel/vendor_extensions/Makefile b/arch/riscv/kern= el/vendor_extensions/Makefile index 6a61aed944f1..353522cb3bf0 100644 --- a/arch/riscv/kernel/vendor_extensions/Makefile +++ b/arch/riscv/kernel/vendor_extensions/Makefile @@ -1,3 +1,4 @@ # SPDX-License-Identifier: GPL-2.0-only =20 obj-$(CONFIG_RISCV_ISA_VENDOR_EXT_ANDES) +=3D andes.o +obj-$(CONFIG_RISCV_ISA_VENDOR_EXT_THEAD) +=3D thead.o diff --git a/arch/riscv/kernel/vendor_extensions/thead.c b/arch/riscv/kerne= l/vendor_extensions/thead.c new file mode 100644 index 000000000000..0934a2086473 --- /dev/null +++ b/arch/riscv/kernel/vendor_extensions/thead.c @@ -0,0 +1,18 @@ +// SPDX-License-Identifier: GPL-2.0-only + +#include +#include +#include + +#include +#include + +/* All T-Head vendor extensions supported in Linux */ +const struct riscv_isa_ext_data riscv_isa_vendor_ext_thead[] =3D { + __RISCV_ISA_EXT_DATA(xtheadvector, RISCV_ISA_VENDOR_EXT_XTHEADVECTOR), +}; 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Fri, 19 Jul 2024 09:19:11 -0700 (PDT) From: Charlie Jenkins Date: Fri, 19 Jul 2024 09:19:00 -0700 Subject: [PATCH v5 05/13] riscv: vector: Use vlenb from DT for thead Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20240719-xtheadvector-v5-5-4b485fc7d55f@rivosinc.com> References: <20240719-xtheadvector-v5-0-4b485fc7d55f@rivosinc.com> In-Reply-To: <20240719-xtheadvector-v5-0-4b485fc7d55f@rivosinc.com> To: Conor Dooley , Rob Herring , Krzysztof Kozlowski , Paul Walmsley , Palmer Dabbelt , Albert Ou , Jisheng Zhang , Chen-Yu Tsai , Jernej Skrabec , Samuel Holland , Samuel Holland , Jonathan Corbet , Shuah Khan , Guo Ren , Evan Green , Andy Chiu , Jessica Clarke Cc: linux-riscv@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-sunxi@lists.linux.dev, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, Charlie Jenkins , Conor Dooley X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=ed25519-sha256; t=1721405940; l=4541; i=charlie@rivosinc.com; s=20231120; h=from:subject:message-id; bh=K+roXVx59nBWzGVd/j10XnzknGtMw9TY/ZlmKWcsED4=; b=KFNiqD0jbt/q5ZJLj3DisDT0jaKnMkot671Ib+rlhHiFbFJ37qtP5hySngtI/4oVbcG0afjlF wrFAOybyfGlAt7UZSUZNjohWY1BV5eQo+mT0Z3LeEZ/Nyp5/hFP2Oey X-Developer-Key: i=charlie@rivosinc.com; a=ed25519; pk=t4RSWpMV1q5lf/NWIeR9z58bcje60/dbtxxmoSfBEcs= If thead,vlenb is provided in the device tree, prefer that over reading the vlenb csr. Signed-off-by: Charlie Jenkins Acked-by: Conor Dooley --- arch/riscv/Kconfig.vendor | 13 ++++++++++ arch/riscv/include/asm/cpufeature.h | 2 ++ arch/riscv/kernel/cpufeature.c | 48 +++++++++++++++++++++++++++++++++= ++++ arch/riscv/kernel/vector.c | 12 +++++++++- 4 files changed, 74 insertions(+), 1 deletion(-) diff --git a/arch/riscv/Kconfig.vendor b/arch/riscv/Kconfig.vendor index 9897442bd44f..b096548fe0ff 100644 --- a/arch/riscv/Kconfig.vendor +++ b/arch/riscv/Kconfig.vendor @@ -26,6 +26,19 @@ config RISCV_ISA_VENDOR_EXT_THEAD extensions. Without this option enabled, T-Head vendor extensions will not be detected at boot and their presence not reported to userspace. =20 + If you don't know what to do here, say Y. + +config RISCV_ISA_XTHEADVECTOR + bool "xtheadvector extension support" + depends on RISCV_ISA_VENDOR_EXT_THEAD + depends on RISCV_ISA_V + depends on FPU + default y + help + Say N here if you want to disable all xtheadvector related procedures + in the kernel. This will disable vector for any T-Head board that + contains xtheadvector rather than the standard vector. + If you don't know what to do here, say Y. endmenu =20 diff --git a/arch/riscv/include/asm/cpufeature.h b/arch/riscv/include/asm/c= pufeature.h index 45f9c1171a48..28bdeb1005e0 100644 --- a/arch/riscv/include/asm/cpufeature.h +++ b/arch/riscv/include/asm/cpufeature.h @@ -31,6 +31,8 @@ DECLARE_PER_CPU(struct riscv_cpuinfo, riscv_cpuinfo); /* Per-cpu ISA extensions. */ extern struct riscv_isainfo hart_isa[NR_CPUS]; =20 +extern u32 thead_vlenb_of; + void riscv_user_isa_enable(void); =20 #define _RISCV_ISA_EXT_DATA(_name, _id, _subset_exts, _subset_exts_size, _= validate) { \ diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c index 041e5e8f8312..bf25215bad24 100644 --- a/arch/riscv/kernel/cpufeature.c +++ b/arch/riscv/kernel/cpufeature.c @@ -37,6 +37,8 @@ static DECLARE_BITMAP(riscv_isa, RISCV_ISA_EXT_MAX) __rea= d_mostly; /* Per-cpu ISA extensions. */ struct riscv_isainfo hart_isa[NR_CPUS]; =20 +u32 thead_vlenb_of; + /** * riscv_isa_extension_base() - Get base extension word * @@ -772,6 +774,46 @@ static void __init riscv_fill_vendor_ext_list(int cpu) } } =20 +static int has_thead_homogeneous_vlenb(void) +{ + int cpu; + u32 prev_vlenb =3D 0; + u32 vlenb; + + /* Ignore thead,vlenb property if xtheavector is not enabled in the kerne= l */ + if (!IS_ENABLED(CONFIG_RISCV_ISA_XTHEADVECTOR)) + return 0; + + for_each_possible_cpu(cpu) { + struct device_node *cpu_node; + + cpu_node =3D of_cpu_device_node_get(cpu); + if (!cpu_node) { + pr_warn("Unable to find cpu node\n"); + return -ENOENT; + } + + if (of_property_read_u32(cpu_node, "thead,vlenb", &vlenb)) { + of_node_put(cpu_node); + + if (prev_vlenb) + return -ENOENT; + continue; + } + + if (prev_vlenb && vlenb !=3D prev_vlenb) { + of_node_put(cpu_node); + return -ENOENT; + } + + prev_vlenb =3D vlenb; + of_node_put(cpu_node); + } + + thead_vlenb_of =3D vlenb; + return 0; +} + static int __init riscv_fill_hwcap_from_ext_list(unsigned long *isa2hwcap) { unsigned int cpu; @@ -828,6 +870,12 @@ static int __init riscv_fill_hwcap_from_ext_list(unsig= ned long *isa2hwcap) riscv_fill_vendor_ext_list(cpu); } =20 + if (riscv_isa_vendor_extension_available(THEAD_VENDOR_ID, XTHEADVECTOR) && + has_thead_homogeneous_vlenb() < 0) { + pr_warn("Unsupported heterogeneous vlenb detected, vector extension disa= bled.\n"); + elf_hwcap &=3D ~COMPAT_HWCAP_ISA_V; + } + if (bitmap_empty(riscv_isa, RISCV_ISA_EXT_MAX)) return -ENOENT; =20 diff --git a/arch/riscv/kernel/vector.c b/arch/riscv/kernel/vector.c index 682b3feee451..9775d6a9c8ee 100644 --- a/arch/riscv/kernel/vector.c +++ b/arch/riscv/kernel/vector.c @@ -33,7 +33,17 @@ int riscv_v_setup_vsize(void) { unsigned long this_vsize; =20 - /* There are 32 vector registers with vlenb length. */ + /* + * There are 32 vector registers with vlenb length. + * + * If the thead,vlenb property was provided by the firmware, use that + * instead of probing the CSRs. + */ + if (thead_vlenb_of) { + this_vsize =3D thead_vlenb_of * 32; + return 0; 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Fri, 19 Jul 2024 09:19:13 -0700 (PDT) From: Charlie Jenkins Date: Fri, 19 Jul 2024 09:19:01 -0700 Subject: [PATCH v5 06/13] RISC-V: define the elements of the VCSR vector CSR Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20240719-xtheadvector-v5-6-4b485fc7d55f@rivosinc.com> References: <20240719-xtheadvector-v5-0-4b485fc7d55f@rivosinc.com> In-Reply-To: <20240719-xtheadvector-v5-0-4b485fc7d55f@rivosinc.com> To: Conor Dooley , Rob Herring , Krzysztof Kozlowski , Paul Walmsley , Palmer Dabbelt , Albert Ou , Jisheng Zhang , Chen-Yu Tsai , Jernej Skrabec , Samuel Holland , Samuel Holland , Jonathan Corbet , Shuah Khan , Guo Ren , Evan Green , Andy Chiu , Jessica Clarke Cc: linux-riscv@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-sunxi@lists.linux.dev, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, Charlie Jenkins , Heiko Stuebner , Conor Dooley , Heiko Stuebner X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=ed25519-sha256; t=1721405940; l=930; i=charlie@rivosinc.com; s=20231120; h=from:subject:message-id; bh=0jkC45FH0LUvSVfvCEJuCBZ027fqPbAipPAnc4zFoN4=; b=kJKsEpX+fUX2Wt/n4c9KZOx/LoIvpni+uGwAmrg5zbcQiIgJQZ0LwLXDxk0v5epNZ16kgtSmF oT/F1Zju1FNBC6eHRkfuhUidUEAzjP+Fqr1KM7TrqvwE68kkRQ/SZc/ X-Developer-Key: i=charlie@rivosinc.com; a=ed25519; pk=t4RSWpMV1q5lf/NWIeR9z58bcje60/dbtxxmoSfBEcs= From: Heiko Stuebner The VCSR CSR contains two elements VXRM[2:1] and VXSAT[0]. Define constants for those to access the elements in a readable way. Acked-by: Guo Ren Reviewed-by: Conor Dooley Signed-off-by: Heiko Stuebner Signed-off-by: Charlie Jenkins --- arch/riscv/include/asm/csr.h | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/riscv/include/asm/csr.h b/arch/riscv/include/asm/csr.h index 25966995da04..3eeb07d73065 100644 --- a/arch/riscv/include/asm/csr.h +++ b/arch/riscv/include/asm/csr.h @@ -300,6 +300,10 @@ #define CSR_STIMECMP 0x14D #define CSR_STIMECMPH 0x15D =20 +#define VCSR_VXRM_MASK 3 +#define VCSR_VXRM_SHIFT 1 +#define VCSR_VXSAT_MASK 1 + /* Supervisor-Level Window to Indirectly Accessed Registers (AIA) */ #define CSR_SISELECT 0x150 #define CSR_SIREG 0x151 --=20 2.44.0 From nobody Fri Dec 19 05:36:46 2025 Received: from mail-pl1-f169.google.com (mail-pl1-f169.google.com [209.85.214.169]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5F1041487D4 for ; Fri, 19 Jul 2024 16:19:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; 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Fri, 19 Jul 2024 09:19:16 -0700 (PDT) Received: from charlie.ba.rivosinc.com ([64.71.180.162]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-1fd6f490dcbsm6461435ad.297.2024.07.19.09.19.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 19 Jul 2024 09:19:16 -0700 (PDT) From: Charlie Jenkins Date: Fri, 19 Jul 2024 09:19:02 -0700 Subject: [PATCH v5 07/13] riscv: csr: Add CSR encodings for CSR_VXRM/CSR_VXSAT Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20240719-xtheadvector-v5-7-4b485fc7d55f@rivosinc.com> References: <20240719-xtheadvector-v5-0-4b485fc7d55f@rivosinc.com> In-Reply-To: <20240719-xtheadvector-v5-0-4b485fc7d55f@rivosinc.com> To: Conor Dooley , Rob Herring , Krzysztof Kozlowski , Paul Walmsley , Palmer Dabbelt , Albert Ou , Jisheng Zhang , Chen-Yu Tsai , Jernej Skrabec , Samuel Holland , Samuel Holland , Jonathan Corbet , Shuah Khan , Guo Ren , Evan Green , Andy Chiu , Jessica Clarke Cc: linux-riscv@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-sunxi@lists.linux.dev, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, Charlie Jenkins , Heiko Stuebner X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=ed25519-sha256; t=1721405940; l=1045; i=charlie@rivosinc.com; s=20231120; h=from:subject:message-id; bh=/awdvkpT37Pcv9l+R6WHhK0Ytr8TrWH5wurC23dujZY=; b=V/PMHUAjK0OP/Y/zQ4VqwTikKOoyDyb7MFDrNBGQKWmByMekzQweSn5mpBoX7qu1LxbxT4AQ9 wY71YtPGHNrA18pqy6FN6yA9i9xO/a7HH4WJHKJw5sFUp5DfL89Zut4 X-Developer-Key: i=charlie@rivosinc.com; a=ed25519; pk=t4RSWpMV1q5lf/NWIeR9z58bcje60/dbtxxmoSfBEcs= The VXRM vector csr for xtheadvector has an encoding of 0xa and VXSAT has an encoding of 0x9. Co-developed-by: Heiko Stuebner Signed-off-by: Heiko Stuebner Signed-off-by: Charlie Jenkins --- arch/riscv/include/asm/csr.h | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/arch/riscv/include/asm/csr.h b/arch/riscv/include/asm/csr.h index 3eeb07d73065..c0a60c4ed911 100644 --- a/arch/riscv/include/asm/csr.h +++ b/arch/riscv/include/asm/csr.h @@ -300,9 +300,14 @@ #define CSR_STIMECMP 0x14D #define CSR_STIMECMPH 0x15D =20 -#define VCSR_VXRM_MASK 3 -#define VCSR_VXRM_SHIFT 1 -#define VCSR_VXSAT_MASK 1 +/* xtheadvector symbolic CSR names */ +#define CSR_VXSAT 0x9 +#define CSR_VXRM 0xa + +/* xtheadvector CSR masks */ +#define CSR_VXRM_MASK 3 +#define CSR_VXRM_SHIFT 1 +#define CSR_VXSAT_MASK 1 =20 /* Supervisor-Level Window to Indirectly Accessed Registers (AIA) */ #define CSR_SISELECT 0x150 --=20 2.44.0 From nobody Fri Dec 19 05:36:46 2025 Received: from mail-pl1-f171.google.com (mail-pl1-f171.google.com [209.85.214.171]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5FD10148838 for ; 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a=ed25519-sha256; t=1721405940; l=1957; i=charlie@rivosinc.com; s=20231120; h=from:subject:message-id; bh=L3aaRS2j1B7ly0GhgM86XDS3MRCOslmFg/ArzwGxzO0=; b=46volz7D510nYpV8b8G8sEL+MfKDxkahX1p7p6VUtGEmp9hohd4dHxtouCXjKTmXgbf9vIiF1 wq3zInJRmH+A/hFLdwwNWrSgDojxtU74mzqmsjOmzA+vh2qEoz9yX3B X-Developer-Key: i=charlie@rivosinc.com; a=ed25519; pk=t4RSWpMV1q5lf/NWIeR9z58bcje60/dbtxxmoSfBEcs= xtheadvector uses different encodings than standard vector for vsetvli and vector loads/stores. Write the instruction formats to be used in assembly code. Co-developed-by: Heiko Stuebner Signed-off-by: Heiko Stuebner Signed-off-by: Charlie Jenkins --- arch/riscv/include/asm/vendor_extensions/thead.h | 26 ++++++++++++++++++++= ++++ 1 file changed, 26 insertions(+) diff --git a/arch/riscv/include/asm/vendor_extensions/thead.h b/arch/riscv/= include/asm/vendor_extensions/thead.h index 48421d1553ad..27a253a20ab8 100644 --- a/arch/riscv/include/asm/vendor_extensions/thead.h +++ b/arch/riscv/include/asm/vendor_extensions/thead.h @@ -13,4 +13,30 @@ =20 extern struct riscv_isa_vendor_ext_data_list riscv_isa_vendor_ext_list_the= ad; =20 +/* Extension specific helpers */ + +/* + * Vector 0.7.1 as used for example on T-Head Xuantie cores, uses an older + * encoding for vsetvli (ta, ma vs. d1), so provide an instruction for + * vsetvli t4, x0, e8, m8, d1 + */ +#define THEAD_VSETVLI_T4X0E8M8D1 ".long 0x00307ed7\n\t" +#define THEAD_VSETVLI_X0X0E8M8D1 ".long 0x00307057\n\t" + +/* + * While in theory, the vector-0.7.1 vsb.v and vlb.v result in the same + * encoding as the standard vse8.v and vle8.v, compilers seem to optimize + * the call resulting in a different encoding and then using a value for + * the "mop" field that is not part of vector-0.7.1 + * So encode specific variants for vstate_save and _restore. + */ +#define THEAD_VSB_V_V0T0 ".long 0x02028027\n\t" +#define THEAD_VSB_V_V8T0 ".long 0x02028427\n\t" +#define THEAD_VSB_V_V16T0 ".long 0x02028827\n\t" +#define THEAD_VSB_V_V24T0 ".long 0x02028c27\n\t" +#define THEAD_VLB_V_V0T0 ".long 0x012028007\n\t" +#define THEAD_VLB_V_V8T0 ".long 0x012028407\n\t" +#define THEAD_VLB_V_V16T0 ".long 0x012028807\n\t" +#define THEAD_VLB_V_V24T0 ".long 0x012028c07\n\t" + #endif --=20 2.44.0 From nobody Fri Dec 19 05:36:46 2025 Received: from mail-pf1-f181.google.com (mail-pf1-f181.google.com [209.85.210.181]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AAF43148FFF for ; 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Fri, 19 Jul 2024 09:19:21 -0700 (PDT) Received: from charlie.ba.rivosinc.com ([64.71.180.162]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-1fd6f490dcbsm6461435ad.297.2024.07.19.09.19.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 19 Jul 2024 09:19:20 -0700 (PDT) From: Charlie Jenkins Date: Fri, 19 Jul 2024 09:19:04 -0700 Subject: [PATCH v5 09/13] riscv: vector: Support xtheadvector save/restore Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20240719-xtheadvector-v5-9-4b485fc7d55f@rivosinc.com> References: <20240719-xtheadvector-v5-0-4b485fc7d55f@rivosinc.com> In-Reply-To: <20240719-xtheadvector-v5-0-4b485fc7d55f@rivosinc.com> To: Conor Dooley , Rob Herring , Krzysztof Kozlowski , Paul Walmsley , Palmer Dabbelt , Albert Ou , Jisheng Zhang , Chen-Yu Tsai , Jernej Skrabec , Samuel Holland , Samuel Holland , Jonathan Corbet , Shuah Khan , Guo Ren , Evan Green , Andy Chiu , Jessica Clarke Cc: linux-riscv@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-sunxi@lists.linux.dev, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, Charlie Jenkins , Conor Dooley X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=ed25519-sha256; t=1721405940; l=18546; i=charlie@rivosinc.com; s=20231120; h=from:subject:message-id; bh=TwA0gwFg2vgNEL89uxalGbRfzdlmmPfjJ4oKZqlRd+A=; b=IlWF+XMx5tlTT1IsxunlUwo85fmKUJgdH18FkfrQBhfAFPV1dhjyJGc5ChD/euuSqaoVg1JuV qaYiNXjs2xhBc840e92Wfbp3kIEcgHZPtEajovmv1AaZ5aFqgnv2BGS X-Developer-Key: i=charlie@rivosinc.com; a=ed25519; pk=t4RSWpMV1q5lf/NWIeR9z58bcje60/dbtxxmoSfBEcs= Use alternatives to add support for xtheadvector vector save/restore routines. Signed-off-by: Charlie Jenkins Reviewed-by: Conor Dooley --- arch/riscv/include/asm/csr.h | 6 + arch/riscv/include/asm/switch_to.h | 2 +- arch/riscv/include/asm/vector.h | 223 +++++++++++++++++++++++++----= ---- arch/riscv/kernel/cpufeature.c | 5 +- arch/riscv/kernel/kernel_mode_vector.c | 8 +- arch/riscv/kernel/process.c | 4 +- arch/riscv/kernel/signal.c | 6 +- arch/riscv/kernel/vector.c | 12 +- 8 files changed, 196 insertions(+), 70 deletions(-) diff --git a/arch/riscv/include/asm/csr.h b/arch/riscv/include/asm/csr.h index c0a60c4ed911..b4b3fcb1d142 100644 --- a/arch/riscv/include/asm/csr.h +++ b/arch/riscv/include/asm/csr.h @@ -30,6 +30,12 @@ #define SR_VS_CLEAN _AC(0x00000400, UL) #define SR_VS_DIRTY _AC(0x00000600, UL) =20 +#define SR_VS_THEAD _AC(0x01800000, UL) /* xtheadvector Status */ +#define SR_VS_OFF_THEAD _AC(0x00000000, UL) +#define SR_VS_INITIAL_THEAD _AC(0x00800000, UL) +#define SR_VS_CLEAN_THEAD _AC(0x01000000, UL) +#define SR_VS_DIRTY_THEAD _AC(0x01800000, UL) + #define SR_XS _AC(0x00018000, UL) /* Extension Status */ #define SR_XS_OFF _AC(0x00000000, UL) #define SR_XS_INITIAL _AC(0x00008000, UL) diff --git a/arch/riscv/include/asm/switch_to.h b/arch/riscv/include/asm/sw= itch_to.h index 7594df37cc9f..f9cbebe372b8 100644 --- a/arch/riscv/include/asm/switch_to.h +++ b/arch/riscv/include/asm/switch_to.h @@ -99,7 +99,7 @@ do { \ __set_prev_cpu(__prev->thread); \ if (has_fpu()) \ __switch_to_fpu(__prev, __next); \ - if (has_vector()) \ + if (has_vector() || has_xtheadvector()) \ __switch_to_vector(__prev, __next); \ if (switch_to_should_flush_icache(__next)) \ local_flush_icache_all(); \ diff --git a/arch/riscv/include/asm/vector.h b/arch/riscv/include/asm/vecto= r.h index be7d309cca8a..5f70c403f14f 100644 --- a/arch/riscv/include/asm/vector.h +++ b/arch/riscv/include/asm/vector.h @@ -18,6 +18,27 @@ #include #include #include +#include +#include +#include + +#define __riscv_v_vstate_or(_val, TYPE) ({ \ + typeof(_val) _res =3D _val; \ + if (has_xtheadvector()) \ + _res =3D (_res & ~SR_VS_THEAD) | SR_VS_##TYPE##_THEAD; \ + else \ + _res =3D (_res & ~SR_VS) | SR_VS_##TYPE; \ + _res; \ +}) + +#define __riscv_v_vstate_check(_val, TYPE) ({ \ + bool _res; \ + if (has_xtheadvector()) \ + _res =3D ((_val) & SR_VS_THEAD) =3D=3D SR_VS_##TYPE##_THEAD; \ + else \ + _res =3D ((_val) & SR_VS) =3D=3D SR_VS_##TYPE; \ + _res; \ +}) =20 extern unsigned long riscv_v_vsize; int riscv_v_setup_vsize(void); @@ -40,39 +61,62 @@ static __always_inline bool has_vector(void) return riscv_has_extension_unlikely(RISCV_ISA_EXT_ZVE32X); } =20 +static __always_inline bool has_xtheadvector_no_alternatives(void) +{ + if (IS_ENABLED(CONFIG_RISCV_ISA_XTHEADVECTOR)) + return riscv_isa_vendor_extension_available(THEAD_VENDOR_ID, XTHEADVECTO= R); + else + return false; +} + +static __always_inline bool has_xtheadvector(void) +{ + if (IS_ENABLED(CONFIG_RISCV_ISA_XTHEADVECTOR)) + return riscv_has_vendor_extension_unlikely(THEAD_VENDOR_ID, + RISCV_ISA_VENDOR_EXT_XTHEADVECTOR); + else + return false; +} + static inline void __riscv_v_vstate_clean(struct pt_regs *regs) { - regs->status =3D (regs->status & ~SR_VS) | SR_VS_CLEAN; + regs->status =3D __riscv_v_vstate_or(regs->status, CLEAN); } =20 static inline void __riscv_v_vstate_dirty(struct pt_regs *regs) { - regs->status =3D (regs->status & ~SR_VS) | SR_VS_DIRTY; + regs->status =3D __riscv_v_vstate_or(regs->status, DIRTY); } =20 static inline void riscv_v_vstate_off(struct pt_regs *regs) { - regs->status =3D (regs->status & ~SR_VS) | SR_VS_OFF; + regs->status =3D __riscv_v_vstate_or(regs->status, OFF); } =20 static inline void riscv_v_vstate_on(struct pt_regs *regs) { - regs->status =3D (regs->status & ~SR_VS) | SR_VS_INITIAL; + regs->status =3D __riscv_v_vstate_or(regs->status, INITIAL); } =20 static inline bool riscv_v_vstate_query(struct pt_regs *regs) { - return (regs->status & SR_VS) !=3D 0; + return !__riscv_v_vstate_check(regs->status, OFF); } =20 static __always_inline void riscv_v_enable(void) { - csr_set(CSR_SSTATUS, SR_VS); + if (has_xtheadvector()) + csr_set(CSR_SSTATUS, SR_VS_THEAD); + else + csr_set(CSR_SSTATUS, SR_VS); } =20 static __always_inline void riscv_v_disable(void) { - csr_clear(CSR_SSTATUS, SR_VS); + if (has_xtheadvector()) + csr_clear(CSR_SSTATUS, SR_VS_THEAD); + else + csr_clear(CSR_SSTATUS, SR_VS); } =20 static __always_inline void __vstate_csr_save(struct __riscv_v_ext_state *= dest) @@ -81,10 +125,36 @@ static __always_inline void __vstate_csr_save(struct _= _riscv_v_ext_state *dest) "csrr %0, " __stringify(CSR_VSTART) "\n\t" "csrr %1, " __stringify(CSR_VTYPE) "\n\t" "csrr %2, " __stringify(CSR_VL) "\n\t" - "csrr %3, " __stringify(CSR_VCSR) "\n\t" - "csrr %4, " __stringify(CSR_VLENB) "\n\t" : "=3Dr" (dest->vstart), "=3Dr" (dest->vtype), "=3Dr" (dest->vl), - "=3Dr" (dest->vcsr), "=3Dr" (dest->vlenb) : :); + "=3Dr" (dest->vcsr) : :); + + if (has_xtheadvector()) { + unsigned long status; + + /* + * CSR_VCSR is defined as + * [2:1] - vxrm[1:0] + * [0] - vxsat + * The earlier vector spec implemented by T-Head uses separate + * registers for the same bit-elements, so just combine those + * into the existing output field. + * + * Additionally T-Head cores need FS to be enabled when accessing + * the VXRM and VXSAT CSRs, otherwise ending in illegal instructions. + * Though the cores do not implement the VXRM and VXSAT fields in the + * FCSR CSR that vector-0.7.1 specifies. + */ + status =3D csr_read_set(CSR_STATUS, SR_FS_DIRTY); + dest->vcsr =3D csr_read(CSR_VXSAT) | csr_read(CSR_VXRM) << CSR_VXRM_SHIF= T; + + dest->vlenb =3D riscv_v_vsize / 32; + + if ((status & SR_FS) !=3D SR_FS_DIRTY) + csr_write(CSR_STATUS, status); + } else { + dest->vcsr =3D csr_read(CSR_VCSR); + dest->vlenb =3D csr_read(CSR_VLENB); + } } =20 static __always_inline void __vstate_csr_restore(struct __riscv_v_ext_stat= e *src) @@ -95,9 +165,25 @@ static __always_inline void __vstate_csr_restore(struct= __riscv_v_ext_state *src "vsetvl x0, %2, %1\n\t" ".option pop\n\t" "csrw " __stringify(CSR_VSTART) ", %0\n\t" - "csrw " __stringify(CSR_VCSR) ", %3\n\t" - : : "r" (src->vstart), "r" (src->vtype), "r" (src->vl), - "r" (src->vcsr) :); + : : "r" (src->vstart), "r" (src->vtype), "r" (src->vl)); + + if (has_xtheadvector()) { + unsigned long status =3D csr_read(CSR_SSTATUS); + + /* + * Similar to __vstate_csr_save above, restore values for the + * separate VXRM and VXSAT CSRs from the vcsr variable. + */ + status =3D csr_read_set(CSR_STATUS, SR_FS_DIRTY); + + csr_write(CSR_VXRM, (src->vcsr >> CSR_VXRM_SHIFT) & CSR_VXRM_MASK); + csr_write(CSR_VXSAT, src->vcsr & CSR_VXSAT_MASK); + + if ((status & SR_FS) !=3D SR_FS_DIRTY) + csr_write(CSR_STATUS, status); + } else { + csr_write(CSR_VCSR, src->vcsr); + } } =20 static inline void __riscv_v_vstate_save(struct __riscv_v_ext_state *save_= to, @@ -107,19 +193,33 @@ static inline void __riscv_v_vstate_save(struct __ris= cv_v_ext_state *save_to, =20 riscv_v_enable(); __vstate_csr_save(save_to); - asm volatile ( - ".option push\n\t" - ".option arch, +zve32x\n\t" - "vsetvli %0, x0, e8, m8, ta, ma\n\t" - "vse8.v v0, (%1)\n\t" - "add %1, %1, %0\n\t" - "vse8.v v8, (%1)\n\t" - "add %1, %1, %0\n\t" - "vse8.v v16, (%1)\n\t" - "add %1, %1, %0\n\t" - "vse8.v v24, (%1)\n\t" - ".option pop\n\t" - : "=3D&r" (vl) : "r" (datap) : "memory"); + if (has_xtheadvector()) { + asm volatile ( + "mv t0, %0\n\t" + THEAD_VSETVLI_T4X0E8M8D1 + THEAD_VSB_V_V0T0 + "add t0, t0, t4\n\t" + THEAD_VSB_V_V0T0 + "add t0, t0, t4\n\t" + THEAD_VSB_V_V0T0 + "add t0, t0, t4\n\t" + THEAD_VSB_V_V0T0 + : : "r" (datap) : "memory", "t0", "t4"); + } else { + asm volatile ( + ".option push\n\t" + ".option arch, +zve32x\n\t" + "vsetvli %0, x0, e8, m8, ta, ma\n\t" + "vse8.v v0, (%1)\n\t" + "add %1, %1, %0\n\t" + "vse8.v v8, (%1)\n\t" + "add %1, %1, %0\n\t" + "vse8.v v16, (%1)\n\t" + "add %1, %1, %0\n\t" + "vse8.v v24, (%1)\n\t" + ".option pop\n\t" + : "=3D&r" (vl) : "r" (datap) : "memory"); + } riscv_v_disable(); } =20 @@ -129,28 +229,51 @@ static inline void __riscv_v_vstate_restore(struct __= riscv_v_ext_state *restore_ unsigned long vl; =20 riscv_v_enable(); - asm volatile ( - ".option push\n\t" - ".option arch, +zve32x\n\t" - "vsetvli %0, x0, e8, m8, ta, ma\n\t" - "vle8.v v0, (%1)\n\t" - "add %1, %1, %0\n\t" - "vle8.v v8, (%1)\n\t" - "add %1, %1, %0\n\t" - "vle8.v v16, (%1)\n\t" - "add %1, %1, %0\n\t" - "vle8.v v24, (%1)\n\t" - ".option pop\n\t" - : "=3D&r" (vl) : "r" (datap) : "memory"); + if (has_xtheadvector()) { + asm volatile ( + "mv t0, %0\n\t" + THEAD_VSETVLI_T4X0E8M8D1 + THEAD_VLB_V_V0T0 + "add t0, t0, t4\n\t" + THEAD_VLB_V_V0T0 + "add t0, t0, t4\n\t" + THEAD_VLB_V_V0T0 + "add t0, t0, t4\n\t" + THEAD_VLB_V_V0T0 + : : "r" (datap) : "memory", "t0", "t4"); + } else { + asm volatile ( + ".option push\n\t" + ".option arch, +zve32x\n\t" + "vsetvli %0, x0, e8, m8, ta, ma\n\t" + "vle8.v v0, (%1)\n\t" + "add %1, %1, %0\n\t" + "vle8.v v8, (%1)\n\t" + "add %1, %1, %0\n\t" + "vle8.v v16, (%1)\n\t" + "add %1, %1, %0\n\t" + "vle8.v v24, (%1)\n\t" + ".option pop\n\t" + : "=3D&r" (vl) : "r" (datap) : "memory"); + } __vstate_csr_restore(restore_from); riscv_v_disable(); } =20 static inline void __riscv_v_vstate_discard(void) { - unsigned long vl, vtype_inval =3D 1UL << (BITS_PER_LONG - 1); + unsigned long vtype_inval =3D 1UL << (BITS_PER_LONG - 1); =20 riscv_v_enable(); + if (has_xtheadvector()) + asm volatile (THEAD_VSETVLI_X0X0E8M8D1); + else + asm volatile ( + ".option push\n\t" + ".option arch, +v\n\t" + "vsetvli x0, x0, e8, m8, ta, ma\n\t" + ".option pop\n\t"); + asm volatile ( ".option push\n\t" ".option arch, +zve32x\n\t" @@ -159,25 +282,25 @@ static inline void __riscv_v_vstate_discard(void) "vmv.v.i v8, -1\n\t" "vmv.v.i v16, -1\n\t" "vmv.v.i v24, -1\n\t" - "vsetvl %0, x0, %1\n\t" + "vsetvl x0, x0, %0\n\t" ".option pop\n\t" - : "=3D&r" (vl) : "r" (vtype_inval) : "memory"); + : : "r" (vtype_inval)); + riscv_v_disable(); } =20 static inline void riscv_v_vstate_discard(struct pt_regs *regs) { - if ((regs->status & SR_VS) =3D=3D SR_VS_OFF) - return; - - __riscv_v_vstate_discard(); - __riscv_v_vstate_dirty(regs); + if (riscv_v_vstate_query(regs)) { + __riscv_v_vstate_discard(); + __riscv_v_vstate_dirty(regs); + } } =20 static inline void riscv_v_vstate_save(struct __riscv_v_ext_state *vstate, struct pt_regs *regs) { - if ((regs->status & SR_VS) =3D=3D SR_VS_DIRTY) { + if (__riscv_v_vstate_check(regs->status, DIRTY)) { __riscv_v_vstate_save(vstate, vstate->datap); __riscv_v_vstate_clean(regs); } @@ -186,7 +309,7 @@ static inline void riscv_v_vstate_save(struct __riscv_v= _ext_state *vstate, static inline void riscv_v_vstate_restore(struct __riscv_v_ext_state *vsta= te, struct pt_regs *regs) { - if ((regs->status & SR_VS) !=3D SR_VS_OFF) { + if (riscv_v_vstate_query(regs)) { __riscv_v_vstate_restore(vstate, vstate->datap); __riscv_v_vstate_clean(regs); } @@ -195,7 +318,7 @@ static inline void riscv_v_vstate_restore(struct __risc= v_v_ext_state *vstate, static inline void riscv_v_vstate_set_restore(struct task_struct *task, struct pt_regs *regs) { - if ((regs->status & SR_VS) !=3D SR_VS_OFF) { + if (riscv_v_vstate_query(regs)) { set_tsk_thread_flag(task, TIF_RISCV_V_DEFER_RESTORE); riscv_v_vstate_on(regs); } diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c index bf25215bad24..cb48092fdc5d 100644 --- a/arch/riscv/kernel/cpufeature.c +++ b/arch/riscv/kernel/cpufeature.c @@ -845,10 +845,7 @@ static int __init riscv_fill_hwcap_from_ext_list(unsig= ned long *isa2hwcap) riscv_isa_set_ext(ext, source_isa); } =20 -<<<<<<< HEAD riscv_resolve_isa(source_isa, isainfo->isa, &this_hwcap, isa2hwcap); -=3D=3D=3D=3D=3D=3D=3D ->>>>>>> 0f260ac829ca (riscv: Extend cpufeature.c to detect vendor extensio= ns) riscv_fill_cpu_vendor_ext(cpu_node, cpu); =20 of_node_put(cpu_node); @@ -928,7 +925,7 @@ void __init riscv_fill_hwcap(void) elf_hwcap &=3D ~COMPAT_HWCAP_ISA_F; } =20 - if (__riscv_isa_extension_available(NULL, RISCV_ISA_EXT_ZVE32X)) { + if (__riscv_isa_extension_available(NULL, RISCV_ISA_EXT_ZVE32X) || has_xt= headvector_no_alternatives()) { /* * This cannot fail when called on the boot hart */ diff --git a/arch/riscv/kernel/kernel_mode_vector.c b/arch/riscv/kernel/ker= nel_mode_vector.c index 6afe80c7f03a..99972a48e86b 100644 --- a/arch/riscv/kernel/kernel_mode_vector.c +++ b/arch/riscv/kernel/kernel_mode_vector.c @@ -143,7 +143,7 @@ static int riscv_v_start_kernel_context(bool *is_nested) =20 /* Transfer the ownership of V from user to kernel, then save */ riscv_v_start(RISCV_PREEMPT_V | RISCV_PREEMPT_V_DIRTY); - if ((task_pt_regs(current)->status & SR_VS) =3D=3D SR_VS_DIRTY) { + if (__riscv_v_vstate_check(task_pt_regs(current)->status, DIRTY)) { uvstate =3D ¤t->thread.vstate; __riscv_v_vstate_save(uvstate, uvstate->datap); } @@ -160,7 +160,7 @@ asmlinkage void riscv_v_context_nesting_start(struct pt= _regs *regs) return; =20 depth =3D riscv_v_ctx_get_depth(); - if (depth =3D=3D 0 && (regs->status & SR_VS) =3D=3D SR_VS_DIRTY) + if (depth =3D=3D 0 && __riscv_v_vstate_check(regs->status, DIRTY)) riscv_preempt_v_set_dirty(); =20 riscv_v_ctx_depth_inc(); @@ -208,7 +208,7 @@ void kernel_vector_begin(void) { bool nested =3D false; =20 - if (WARN_ON(!has_vector())) + if (WARN_ON(!(has_vector() || has_xtheadvector()))) return; =20 BUG_ON(!may_use_simd()); @@ -236,7 +236,7 @@ EXPORT_SYMBOL_GPL(kernel_vector_begin); */ void kernel_vector_end(void) { - if (WARN_ON(!has_vector())) + if (WARN_ON(!(has_vector() || has_xtheadvector()))) return; =20 riscv_v_disable(); diff --git a/arch/riscv/kernel/process.c b/arch/riscv/kernel/process.c index e4bc61c4e58a..191023decd16 100644 --- a/arch/riscv/kernel/process.c +++ b/arch/riscv/kernel/process.c @@ -176,7 +176,7 @@ void flush_thread(void) void arch_release_task_struct(struct task_struct *tsk) { /* Free the vector context of datap. */ - if (has_vector()) + if (has_vector() || has_xtheadvector()) riscv_v_thread_free(tsk); } =20 @@ -222,7 +222,7 @@ int copy_thread(struct task_struct *p, const struct ker= nel_clone_args *args) p->thread.s[0] =3D 0; } p->thread.riscv_v_flags =3D 0; - if (has_vector()) + if (has_vector() || has_xtheadvector()) riscv_v_thread_alloc(p); p->thread.ra =3D (unsigned long)ret_from_fork; p->thread.sp =3D (unsigned long)childregs; /* kernel sp */ diff --git a/arch/riscv/kernel/signal.c b/arch/riscv/kernel/signal.c index 5a2edd7f027e..1d5e4b3ca9e1 100644 --- a/arch/riscv/kernel/signal.c +++ b/arch/riscv/kernel/signal.c @@ -189,7 +189,7 @@ static long restore_sigcontext(struct pt_regs *regs, =20 return 0; case RISCV_V_MAGIC: - if (!has_vector() || !riscv_v_vstate_query(regs) || + if (!(has_vector() || has_xtheadvector()) || !riscv_v_vstate_query(regs= ) || size !=3D riscv_v_sc_size) return -EINVAL; =20 @@ -211,7 +211,7 @@ static size_t get_rt_frame_size(bool cal_all) =20 frame_size =3D sizeof(*frame); =20 - if (has_vector()) { + if (has_vector() || has_xtheadvector()) { if (cal_all || riscv_v_vstate_query(task_pt_regs(current))) total_context_size +=3D riscv_v_sc_size; } @@ -284,7 +284,7 @@ static long setup_sigcontext(struct rt_sigframe __user = *frame, if (has_fpu()) err |=3D save_fp_state(regs, &sc->sc_fpregs); /* Save the vector state. */ - if (has_vector() && riscv_v_vstate_query(regs)) + if ((has_vector() || has_xtheadvector()) && riscv_v_vstate_query(regs)) err |=3D save_v_state(regs, (void __user **)&sc_ext_ptr); /* Write zero to fp-reserved space and check it on restore_sigcontext */ err |=3D __put_user(0, &sc->sc_extdesc.reserved); diff --git a/arch/riscv/kernel/vector.c b/arch/riscv/kernel/vector.c index 9775d6a9c8ee..f3e1de574050 100644 --- a/arch/riscv/kernel/vector.c +++ b/arch/riscv/kernel/vector.c @@ -63,7 +63,7 @@ int riscv_v_setup_vsize(void) =20 void __init riscv_v_setup_ctx_cache(void) { - if (!has_vector()) + if (!(has_vector() || has_xtheadvector())) return; =20 riscv_v_user_cachep =3D kmem_cache_create_usercopy("riscv_vector_ctx", @@ -183,7 +183,7 @@ bool riscv_v_first_use_handler(struct pt_regs *regs) u32 __user *epc =3D (u32 __user *)regs->epc; u32 insn =3D (u32)regs->badaddr; =20 - if (!has_vector()) + if (!(has_vector() || has_xtheadvector())) return false; =20 /* Do not handle if V is not supported, or disabled */ @@ -226,7 +226,7 @@ void riscv_v_vstate_ctrl_init(struct task_struct *tsk) bool inherit; int cur, next; =20 - if (!has_vector()) + if (!(has_vector() || has_xtheadvector())) return; =20 next =3D riscv_v_ctrl_get_next(tsk); @@ -248,7 +248,7 @@ void riscv_v_vstate_ctrl_init(struct task_struct *tsk) =20 long riscv_v_vstate_ctrl_get_current(void) { - if (!has_vector()) + if (!(has_vector() || has_xtheadvector())) return -EINVAL; =20 return current->thread.vstate_ctrl & PR_RISCV_V_VSTATE_CTRL_MASK; @@ -259,7 +259,7 @@ long riscv_v_vstate_ctrl_set_current(unsigned long arg) bool inherit; int cur, next; =20 - if (!has_vector()) + if (!(has_vector() || has_xtheadvector())) return -EINVAL; =20 if (arg & ~PR_RISCV_V_VSTATE_CTRL_MASK) @@ -309,7 +309,7 @@ static struct ctl_table riscv_v_default_vstate_table[] = =3D { =20 static int __init riscv_v_sysctl_init(void) { - if (has_vector()) + if (has_vector() || has_xtheadvector()) if (!register_sysctl("abi", riscv_v_default_vstate_table)) return -EINVAL; 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a=ed25519; pk=t4RSWpMV1q5lf/NWIeR9z58bcje60/dbtxxmoSfBEcs= Add a new hwprobe key "RISCV_HWPROBE_KEY_VENDOR_EXT_THEAD_0" which allows userspace to probe for the new RISCV_ISA_VENDOR_EXT_XTHEADVECTOR vendor extension. This new key will allow userspace code to probe for which thead vendor extensions are supported. This API is modeled to be consistent with RISCV_HWPROBE_KEY_IMA_EXT_0. The bitmask returned will have each bit corresponding to a supported thead vendor extension of the cpumask set. Just like RISCV_HWPROBE_KEY_IMA_EXT_0, this allows a userspace program to determine all of the supported thead vendor extensions in one call. Signed-off-by: Charlie Jenkins Reviewed-by: Evan Green --- arch/riscv/include/asm/hwprobe.h | 5 +-- .../include/asm/vendor_extensions/thead_hwprobe.h | 18 +++++++++++ .../include/asm/vendor_extensions/vendor_hwprobe.h | 37 ++++++++++++++++++= ++++ arch/riscv/include/uapi/asm/hwprobe.h | 3 +- arch/riscv/include/uapi/asm/vendor/thead.h | 3 ++ arch/riscv/kernel/sys_hwprobe.c | 5 +++ arch/riscv/kernel/vendor_extensions/Makefile | 1 + .../riscv/kernel/vendor_extensions/thead_hwprobe.c | 19 +++++++++++ 8 files changed, 88 insertions(+), 3 deletions(-) diff --git a/arch/riscv/include/asm/hwprobe.h b/arch/riscv/include/asm/hwpr= obe.h index 150a9877b0af..6148e1eab64c 100644 --- a/arch/riscv/include/asm/hwprobe.h +++ b/arch/riscv/include/asm/hwprobe.h @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ /* - * Copyright 2023 Rivos, Inc + * Copyright 2023-2024 Rivos, Inc */ =20 #ifndef _ASM_HWPROBE_H @@ -8,7 +8,7 @@ =20 #include =20 -#define RISCV_HWPROBE_MAX_KEY 7 +#define RISCV_HWPROBE_MAX_KEY 8 =20 static inline bool riscv_hwprobe_key_is_valid(__s64 key) { @@ -21,6 +21,7 @@ static inline bool hwprobe_key_is_bitmask(__s64 key) case RISCV_HWPROBE_KEY_BASE_BEHAVIOR: case RISCV_HWPROBE_KEY_IMA_EXT_0: case RISCV_HWPROBE_KEY_CPUPERF_0: + case RISCV_HWPROBE_KEY_VENDOR_EXT_THEAD_0: return true; } =20 diff --git a/arch/riscv/include/asm/vendor_extensions/thead_hwprobe.h b/arc= h/riscv/include/asm/vendor_extensions/thead_hwprobe.h new file mode 100644 index 000000000000..925fef39a2c0 --- /dev/null +++ b/arch/riscv/include/asm/vendor_extensions/thead_hwprobe.h @@ -0,0 +1,18 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_RISCV_VENDOR_EXTENSIONS_THEAD_HWPROBE_H +#define _ASM_RISCV_VENDOR_EXTENSIONS_THEAD_HWPROBE_H + +#include + +#include + +#ifdef CONFIG_RISCV_ISA_VENDOR_EXT_THEAD +void hwprobe_isa_vendor_ext_thead_0(struct riscv_hwprobe *pair, const stru= ct cpumask *cpus); +#else +static inline void hwprobe_isa_vendor_ext_thead_0(struct riscv_hwprobe *pa= ir, const struct cpumask *cpus) +{ + pair->value =3D 0; +} +#endif + +#endif diff --git a/arch/riscv/include/asm/vendor_extensions/vendor_hwprobe.h b/ar= ch/riscv/include/asm/vendor_extensions/vendor_hwprobe.h new file mode 100644 index 000000000000..f28f31e19cda --- /dev/null +++ b/arch/riscv/include/asm/vendor_extensions/vendor_hwprobe.h @@ -0,0 +1,37 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright 2024 Rivos, Inc + */ + +#ifndef _ASM_RISCV_SYS_HWPROBE_H +#define _ASM_RISCV_SYS_HWPROBE_H + +#include + +#define VENDOR_EXT_KEY(ext) \ + do { \ + if (__riscv_isa_extension_available(isainfo->isa, RISCV_ISA_VENDOR_EXT_#= #ext)) \ + pair->value |=3D RISCV_HWPROBE_VENDOR_EXT_##ext; \ + else \ + missing |=3D RISCV_HWPROBE_VENDOR_EXT_##ext; \ + } while (false) + +/* + * Loop through and record extensions that 1) anyone has, and 2) anyone + * doesn't have. + * + * _extension_checks is an arbitrary C block to set the values of pair->va= lue + * and missing. It should be filled with VENDOR_EXT_KEY expressions. + */ +#define VENDOR_EXTENSION_SUPPORTED(pair, cpus, per_hart_vendor_bitmap, _ex= tension_checks) \ + do { \ + int cpu; \ + u64 missing; \ + for_each_cpu(cpu, (cpus)) { \ + struct riscv_isavendorinfo *isainfo =3D &(per_hart_vendor_bitmap)[cpu];= \ + _extension_checks \ + } \ + (pair)->value &=3D ~missing; \ + } while (false) \ + +#endif /* _ASM_RISCV_SYS_HWPROBE_H */ diff --git a/arch/riscv/include/uapi/asm/hwprobe.h b/arch/riscv/include/uap= i/asm/hwprobe.h index 8b8f6ac0eae2..73ab65ac8c55 100644 --- a/arch/riscv/include/uapi/asm/hwprobe.h +++ b/arch/riscv/include/uapi/asm/hwprobe.h @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ /* - * Copyright 2023 Rivos, Inc + * Copyright 2023-2024 Rivos, Inc */ =20 #ifndef _UAPI_ASM_HWPROBE_H @@ -81,6 +81,7 @@ struct riscv_hwprobe { #define RISCV_HWPROBE_MISALIGNED_MASK (7 << 0) #define RISCV_HWPROBE_KEY_ZICBOZ_BLOCK_SIZE 6 #define RISCV_HWPROBE_KEY_HIGHEST_VIRT_ADDRESS 7 +#define RISCV_HWPROBE_KEY_VENDOR_EXT_THEAD_0 8 /* Increase RISCV_HWPROBE_MAX_KEY when adding items. */ =20 /* Flags */ diff --git a/arch/riscv/include/uapi/asm/vendor/thead.h b/arch/riscv/includ= e/uapi/asm/vendor/thead.h new file mode 100644 index 000000000000..43790ebe5faf --- /dev/null +++ b/arch/riscv/include/uapi/asm/vendor/thead.h @@ -0,0 +1,3 @@ +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ + +#define RISCV_HWPROBE_VENDOR_EXT_XTHEADVECTOR (1 << 0) diff --git a/arch/riscv/kernel/sys_hwprobe.c b/arch/riscv/kernel/sys_hwprob= e.c index 685594769535..4cecdb0249a2 100644 --- a/arch/riscv/kernel/sys_hwprobe.c +++ b/arch/riscv/kernel/sys_hwprobe.c @@ -14,6 +14,7 @@ #include #include #include +#include #include =20 =20 @@ -237,6 +238,10 @@ static void hwprobe_one_pair(struct riscv_hwprobe *pai= r, pair->value =3D user_max_virt_addr(); break; =20 + case RISCV_HWPROBE_KEY_VENDOR_EXT_THEAD_0: + hwprobe_isa_vendor_ext_thead_0(pair, cpus); + break; + /* * For forward compatibility, unknown keys don't fail the whole * call, but get their element key set to -1 and value set to 0 diff --git a/arch/riscv/kernel/vendor_extensions/Makefile b/arch/riscv/kern= el/vendor_extensions/Makefile index 353522cb3bf0..866414c81a9f 100644 --- a/arch/riscv/kernel/vendor_extensions/Makefile +++ b/arch/riscv/kernel/vendor_extensions/Makefile @@ -2,3 +2,4 @@ =20 obj-$(CONFIG_RISCV_ISA_VENDOR_EXT_ANDES) +=3D andes.o obj-$(CONFIG_RISCV_ISA_VENDOR_EXT_THEAD) +=3D thead.o +obj-$(CONFIG_RISCV_ISA_VENDOR_EXT_THEAD) +=3D thead_hwprobe.o diff --git a/arch/riscv/kernel/vendor_extensions/thead_hwprobe.c b/arch/ris= cv/kernel/vendor_extensions/thead_hwprobe.c new file mode 100644 index 000000000000..2eba34011786 --- /dev/null +++ b/arch/riscv/kernel/vendor_extensions/thead_hwprobe.c @@ -0,0 +1,19 @@ +// SPDX-License-Identifier: GPL-2.0-only + +#include +#include +#include + +#include +#include + +#include +#include + +void hwprobe_isa_vendor_ext_thead_0(struct riscv_hwprobe *pair, const stru= ct cpumask *cpus) +{ + VENDOR_EXTENSION_SUPPORTED(pair, cpus, + riscv_isa_vendor_ext_list_thead.per_hart_isa_bitmap, { + VENDOR_EXT_KEY(XTHEADVECTOR); 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a=ed25519; pk=t4RSWpMV1q5lf/NWIeR9z58bcje60/dbtxxmoSfBEcs= Document support for thead vendor extensions using the key RISCV_HWPROBE_KEY_VENDOR_EXT_THEAD_0 and xtheadvector extension using the key RISCV_HWPROBE_VENDOR_EXT_XTHEADVECTOR. Signed-off-by: Charlie Jenkins Reviewed-by: Evan Green --- Documentation/arch/riscv/hwprobe.rst | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/Documentation/arch/riscv/hwprobe.rst b/Documentation/arch/risc= v/hwprobe.rst index 02eb4d98b7de..b48a06ef80e0 100644 --- a/Documentation/arch/riscv/hwprobe.rst +++ b/Documentation/arch/riscv/hwprobe.rst @@ -264,3 +264,13 @@ The following keys are defined: =20 * :c:macro:`RISCV_HWPROBE_KEY_HIGHEST_VIRT_ADDRESS`: An unsigned long which represent the highest userspace virtual address usable. + +* :c:macro:`RISCV_HWPROBE_KEY_VENDOR_EXT_THEAD_0`: A bitmask containing the + thead vendor extensions that are compatible with the + :c:macro:`RISCV_HWPROBE_BASE_BEHAVIOR_IMA`: base system behavior. + + * T-HEAD + + * :c:macro:`RISCV_HWPROBE_VENDOR_EXT_XTHEADVECTOR`: The xtheadvector v= endor + extension is supported in the T-Head ISA extensions spec starting = from + commit a18c801634 ("Add T-Head VECTOR vendor extension. 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charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20240719-xtheadvector-v5-12-4b485fc7d55f@rivosinc.com> References: <20240719-xtheadvector-v5-0-4b485fc7d55f@rivosinc.com> In-Reply-To: <20240719-xtheadvector-v5-0-4b485fc7d55f@rivosinc.com> To: Conor Dooley , Rob Herring , Krzysztof Kozlowski , Paul Walmsley , Palmer Dabbelt , Albert Ou , Jisheng Zhang , Chen-Yu Tsai , Jernej Skrabec , Samuel Holland , Samuel Holland , Jonathan Corbet , Shuah Khan , Guo Ren , Evan Green , Andy Chiu , Jessica Clarke Cc: linux-riscv@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-sunxi@lists.linux.dev, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, Charlie Jenkins X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=ed25519-sha256; t=1721405940; l=19975; i=charlie@rivosinc.com; s=20231120; h=from:subject:message-id; bh=5GKXb5W7YzJw72WFxjJ5qhpiBsB2fftDiDUs0P01VKY=; b=xS9P4oNK9RW4NYfGSzs8s/EhoZBbrZ9bmk8AqB0zTudiicQVg/EtTBPtVjZJmXbGklKD8nb6N 4/lpgKlHzz5Cy+xNMPQXMGh5LqvlHbcqSoA21i7WoXIJNiSejpjmStb X-Developer-Key: i=charlie@rivosinc.com; a=ed25519; pk=t4RSWpMV1q5lf/NWIeR9z58bcje60/dbtxxmoSfBEcs= Overhaul the riscv vector tests to use kselftest_harness to help the test cases correctly report the results and decouple the individual test cases from each other. With this refactoring, only run the test cases is vector is reported and properly report the test case as skipped otherwise. The v_initval_nolibc test was previously not checking if vector was supported and used a function (malloc) which invalidates the state of the vector registers. Signed-off-by: Charlie Jenkins --- tools/testing/selftests/riscv/abi/ptrace | Bin 0 -> 759368 bytes tools/testing/selftests/riscv/vector/.gitignore | 3 +- tools/testing/selftests/riscv/vector/Makefile | 17 +- .../selftests/riscv/vector/v_exec_initval_nolibc.c | 84 +++++++ tools/testing/selftests/riscv/vector/v_helpers.c | 56 +++++ tools/testing/selftests/riscv/vector/v_helpers.h | 5 + tools/testing/selftests/riscv/vector/v_initval.c | 16 ++ .../selftests/riscv/vector/v_initval_nolibc.c | 68 ------ .../testing/selftests/riscv/vector/vstate_prctl.c | 266 ++++++++++++-----= ---- 9 files changed, 324 insertions(+), 191 deletions(-) diff --git a/tools/testing/selftests/riscv/abi/ptrace b/tools/testing/selft= ests/riscv/abi/ptrace new file mode 100755 index 000000000000..2b03e77b4dcf Binary files /dev/null and b/tools/testing/selftests/riscv/abi/ptrace differ diff --git a/tools/testing/selftests/riscv/vector/.gitignore b/tools/testin= g/selftests/riscv/vector/.gitignore index 9ae7964491d5..7d9c87cd0649 100644 --- a/tools/testing/selftests/riscv/vector/.gitignore +++ b/tools/testing/selftests/riscv/vector/.gitignore @@ -1,3 +1,4 @@ vstate_exec_nolibc vstate_prctl -v_initval_nolibc +v_initval +v_exec_initval_nolibc diff --git a/tools/testing/selftests/riscv/vector/Makefile b/tools/testing/= selftests/riscv/vector/Makefile index bfff0ff4f3be..995746359477 100644 --- a/tools/testing/selftests/riscv/vector/Makefile +++ b/tools/testing/selftests/riscv/vector/Makefile @@ -2,18 +2,27 @@ # Copyright (C) 2021 ARM Limited # Originally tools/testing/arm64/abi/Makefile =20 -TEST_GEN_PROGS :=3D vstate_prctl v_initval_nolibc -TEST_GEN_PROGS_EXTENDED :=3D vstate_exec_nolibc +TEST_GEN_PROGS :=3D v_initval vstate_prctl +TEST_GEN_PROGS_EXTENDED :=3D vstate_exec_nolibc v_exec_initval_nolibc sys_= hwprobe.o v_helpers.o =20 include ../../lib.mk =20 -$(OUTPUT)/vstate_prctl: vstate_prctl.c ../hwprobe/sys_hwprobe.S +$(OUTPUT)/sys_hwprobe.o: ../hwprobe/sys_hwprobe.S + $(CC) -static -c -o$@ $(CFLAGS) $^ + +$(OUTPUT)/v_helpers.o: v_helpers.c + $(CC) -static -c -o$@ $(CFLAGS) $^ + +$(OUTPUT)/vstate_prctl: vstate_prctl.c $(OUTPUT)/sys_hwprobe.o $(OUTPUT)/v= _helpers.o $(CC) -static -o$@ $(CFLAGS) $(LDFLAGS) $^ =20 $(OUTPUT)/vstate_exec_nolibc: vstate_exec_nolibc.c $(CC) -nostdlib -static -include ../../../../include/nolibc/nolibc.h \ -Wall $(CFLAGS) $(LDFLAGS) $^ -o $@ -lgcc =20 -$(OUTPUT)/v_initval_nolibc: v_initval_nolibc.c +$(OUTPUT)/v_initval: v_initval.c $(OUTPUT)/sys_hwprobe.o $(OUTPUT)/v_helpe= rs.o + $(CC) -static -o$@ $(CFLAGS) $(LDFLAGS) $^ + +$(OUTPUT)/v_exec_initval_nolibc: v_exec_initval_nolibc.c $(CC) -nostdlib -static -include ../../../../include/nolibc/nolibc.h \ -Wall $(CFLAGS) $(LDFLAGS) $^ -o $@ -lgcc diff --git a/tools/testing/selftests/riscv/vector/v_exec_initval_nolibc.c b= /tools/testing/selftests/riscv/vector/v_exec_initval_nolibc.c new file mode 100644 index 000000000000..74b13806baf0 --- /dev/null +++ b/tools/testing/selftests/riscv/vector/v_exec_initval_nolibc.c @@ -0,0 +1,84 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Get values of vector registers as soon as the program starts to test if + * is properly cleaning the values before starting a new program. Vector + * registers are caller saved, so no function calls may happen before read= ing + * the values. To further ensure consistency, this file is compiled without + * libc and without auto-vectorization. + * + * To be "clean" all values must be either all ones or all zeroes. + */ + +#define __stringify_1(x...) #x +#define __stringify(x...) __stringify_1(x) + +int main(int argc, char **argv) +{ + char prev_value =3D 0, value; + unsigned long vl; + int first =3D 1; + + asm volatile ( + ".option push\n\t" + ".option arch, +v\n\t" + "vsetvli %[vl], x0, e8, m1, ta, ma\n\t" + ".option pop\n\t" + : [vl] "=3Dr" (vl) + ); + +#define CHECK_VECTOR_REGISTER(register) ({ \ + for (int i =3D 0; i < vl; i++) { \ + asm volatile ( \ + ".option push\n\t" \ + ".option arch, +v\n\t" \ + "vmv.x.s %0, " __stringify(register) "\n\t" \ + "vsrl.vi " __stringify(register) ", " __stringify(register) ", 8\n\t" \ + ".option pop\n\t" \ + : "=3Dr" (value)); \ + if (first) { \ + first =3D 0; \ + } else if (value !=3D prev_value || !(value =3D=3D 0x00 || value =3D=3D = 0xff)) { \ + printf("Register " __stringify(register) " values not clean! value: %u\= n", value); \ + exit(-1); \ + } \ + prev_value =3D value; \ + } \ +}) + + CHECK_VECTOR_REGISTER(v0); + CHECK_VECTOR_REGISTER(v1); + CHECK_VECTOR_REGISTER(v2); + CHECK_VECTOR_REGISTER(v3); + CHECK_VECTOR_REGISTER(v4); + CHECK_VECTOR_REGISTER(v5); + CHECK_VECTOR_REGISTER(v6); + CHECK_VECTOR_REGISTER(v7); + CHECK_VECTOR_REGISTER(v8); + CHECK_VECTOR_REGISTER(v9); + CHECK_VECTOR_REGISTER(v10); + CHECK_VECTOR_REGISTER(v11); + CHECK_VECTOR_REGISTER(v12); + CHECK_VECTOR_REGISTER(v13); + CHECK_VECTOR_REGISTER(v14); + CHECK_VECTOR_REGISTER(v15); + CHECK_VECTOR_REGISTER(v16); + CHECK_VECTOR_REGISTER(v17); + CHECK_VECTOR_REGISTER(v18); + CHECK_VECTOR_REGISTER(v19); + CHECK_VECTOR_REGISTER(v20); + CHECK_VECTOR_REGISTER(v21); + CHECK_VECTOR_REGISTER(v22); + CHECK_VECTOR_REGISTER(v23); + CHECK_VECTOR_REGISTER(v24); + CHECK_VECTOR_REGISTER(v25); + CHECK_VECTOR_REGISTER(v26); + CHECK_VECTOR_REGISTER(v27); + CHECK_VECTOR_REGISTER(v28); + CHECK_VECTOR_REGISTER(v29); + CHECK_VECTOR_REGISTER(v30); + CHECK_VECTOR_REGISTER(v31); + +#undef CHECK_VECTOR_REGISTER + + return 0; +} diff --git a/tools/testing/selftests/riscv/vector/v_helpers.c b/tools/testi= ng/selftests/riscv/vector/v_helpers.c new file mode 100644 index 000000000000..ca7525e8274e --- /dev/null +++ b/tools/testing/selftests/riscv/vector/v_helpers.c @@ -0,0 +1,56 @@ +// SPDX-License-Identifier: GPL-2.0-only + +#include "../hwprobe/hwprobe.h" +#include +#include +#include +#include + +int is_vector_supported(void) +{ + struct riscv_hwprobe pair; + + pair.key =3D RISCV_HWPROBE_KEY_IMA_EXT_0; + riscv_hwprobe(&pair, 1, 0, NULL, 0); + return pair.value & RISCV_HWPROBE_EXT_ZVE32X; +} + +int launch_test(char *next_program, int test_inherit) +{ + char *exec_argv[3], *exec_envp[1]; + int rc, pid, status; + + pid =3D fork(); + if (pid < 0) { + printf("fork failed %d", pid); + return -1; + } + + if (!pid) { + exec_argv[0] =3D next_program; + exec_argv[1] =3D test_inherit !=3D 0 ? "x" : NULL; + exec_argv[2] =3D NULL; + exec_envp[0] =3D NULL; + /* launch the program again to check inherit */ + rc =3D execve(next_program, exec_argv, exec_envp); + if (rc) { + perror("execve"); + printf("child execve failed %d\n", rc); + exit(-1); + } + } + + rc =3D waitpid(-1, &status, 0); + if (rc < 0) { + printf("waitpid failed\n"); + return -3; + } + + if ((WIFEXITED(status) && WEXITSTATUS(status) =3D=3D -1) || + WIFSIGNALED(status)) { + printf("child exited abnormally\n"); + return -4; + } + + return WEXITSTATUS(status); +} diff --git a/tools/testing/selftests/riscv/vector/v_helpers.h b/tools/testi= ng/selftests/riscv/vector/v_helpers.h new file mode 100644 index 000000000000..88719c4be496 --- /dev/null +++ b/tools/testing/selftests/riscv/vector/v_helpers.h @@ -0,0 +1,5 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ + +int is_vector_supported(void); + +int launch_test(char *next_program, int test_inherit); diff --git a/tools/testing/selftests/riscv/vector/v_initval.c b/tools/testi= ng/selftests/riscv/vector/v_initval.c new file mode 100644 index 000000000000..f38b5797fa31 --- /dev/null +++ b/tools/testing/selftests/riscv/vector/v_initval.c @@ -0,0 +1,16 @@ +// SPDX-License-Identifier: GPL-2.0-only + +#include "../../kselftest_harness.h" +#include "v_helpers.h" + +#define NEXT_PROGRAM "./v_exec_initval_nolibc" + +TEST(v_initval) +{ + if (!is_vector_supported()) + SKIP(return, "Vector not supported"); + + ASSERT_EQ(0, launch_test(NEXT_PROGRAM, 0)); +} + +TEST_HARNESS_MAIN diff --git a/tools/testing/selftests/riscv/vector/v_initval_nolibc.c b/tool= s/testing/selftests/riscv/vector/v_initval_nolibc.c deleted file mode 100644 index 1dd94197da30..000000000000 --- a/tools/testing/selftests/riscv/vector/v_initval_nolibc.c +++ /dev/null @@ -1,68 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only - -#include "../../kselftest.h" -#define MAX_VSIZE (8192 * 32) - -void dump(char *ptr, int size) -{ - int i =3D 0; - - for (i =3D 0; i < size; i++) { - if (i !=3D 0) { - if (i % 16 =3D=3D 0) - printf("\n"); - else if (i % 8 =3D=3D 0) - printf(" "); - } - printf("%02x ", ptr[i]); - } - printf("\n"); -} - -int main(void) -{ - int i; - unsigned long vl; - char *datap, *tmp; - - datap =3D malloc(MAX_VSIZE); - if (!datap) { - ksft_test_result_fail("fail to allocate memory for size =3D %d\n", MAX_V= SIZE); - exit(-1); - } - - tmp =3D datap; - asm volatile ( - ".option push\n\t" - ".option arch, +v\n\t" - "vsetvli %0, x0, e8, m8, ta, ma\n\t" - "vse8.v v0, (%2)\n\t" - "add %1, %2, %0\n\t" - "vse8.v v8, (%1)\n\t" - "add %1, %1, %0\n\t" - "vse8.v v16, (%1)\n\t" - "add %1, %1, %0\n\t" - "vse8.v v24, (%1)\n\t" - ".option pop\n\t" - : "=3D&r" (vl), "=3Dr" (tmp) : "r" (datap) : "memory"); - - ksft_print_msg("vl =3D %lu\n", vl); - - if (datap[0] !=3D 0x00 && datap[0] !=3D 0xff) { - ksft_test_result_fail("v-regesters are not properly initialized\n"); - dump(datap, vl * 4); - exit(-1); - } - - for (i =3D 1; i < vl * 4; i++) { - if (datap[i] !=3D datap[0]) { - ksft_test_result_fail("detect stale values on v-regesters\n"); - dump(datap, vl * 4); - exit(-2); - } - } - - free(datap); - ksft_exit_pass(); - return 0; -} diff --git a/tools/testing/selftests/riscv/vector/vstate_prctl.c b/tools/te= sting/selftests/riscv/vector/vstate_prctl.c index 895177f6bf4c..850a0caa226e 100644 --- a/tools/testing/selftests/riscv/vector/vstate_prctl.c +++ b/tools/testing/selftests/riscv/vector/vstate_prctl.c @@ -3,50 +3,13 @@ #include #include #include +#include +#include =20 -#include "../hwprobe/hwprobe.h" -#include "../../kselftest.h" +#include "../../kselftest_harness.h" +#include "v_helpers.h" =20 #define NEXT_PROGRAM "./vstate_exec_nolibc" -static int launch_test(int test_inherit) -{ - char *exec_argv[3], *exec_envp[1]; - int rc, pid, status; - - pid =3D fork(); - if (pid < 0) { - ksft_test_result_fail("fork failed %d", pid); - return -1; - } - - if (!pid) { - exec_argv[0] =3D NEXT_PROGRAM; - exec_argv[1] =3D test_inherit !=3D 0 ? "x" : NULL; - exec_argv[2] =3D NULL; - exec_envp[0] =3D NULL; - /* launch the program again to check inherit */ - rc =3D execve(NEXT_PROGRAM, exec_argv, exec_envp); - if (rc) { - perror("execve"); - ksft_test_result_fail("child execve failed %d\n", rc); - exit(-1); - } - } - - rc =3D waitpid(-1, &status, 0); - if (rc < 0) { - ksft_test_result_fail("waitpid failed\n"); - return -3; - } - - if ((WIFEXITED(status) && WEXITSTATUS(status) =3D=3D -1) || - WIFSIGNALED(status)) { - ksft_test_result_fail("child exited abnormally\n"); - return -4; - } - - return WEXITSTATUS(status); -} =20 int test_and_compare_child(long provided, long expected, int inherit) { @@ -54,14 +17,13 @@ int test_and_compare_child(long provided, long expected= , int inherit) =20 rc =3D prctl(PR_RISCV_V_SET_CONTROL, provided); if (rc !=3D 0) { - ksft_test_result_fail("prctl with provided arg %lx failed with code %d\n= ", - provided, rc); + printf("prctl with provided arg %lx failed with code %d\n", + provided, rc); return -1; } - rc =3D launch_test(inherit); + rc =3D launch_test(NEXT_PROGRAM, inherit); if (rc !=3D expected) { - ksft_test_result_fail("Test failed, check %d !=3D %ld\n", rc, - expected); + printf("Test failed, check %d !=3D %ld\n", rc, expected); return -2; } return 0; @@ -70,112 +32,180 @@ int test_and_compare_child(long provided, long expect= ed, int inherit) #define PR_RISCV_V_VSTATE_CTRL_CUR_SHIFT 0 #define PR_RISCV_V_VSTATE_CTRL_NEXT_SHIFT 2 =20 -int main(void) +TEST(get_control_no_v) { - struct riscv_hwprobe pair; - long flag, expected; long rc; =20 - pair.key =3D RISCV_HWPROBE_KEY_IMA_EXT_0; - rc =3D riscv_hwprobe(&pair, 1, 0, NULL, 0); - if (rc < 0) { - ksft_test_result_fail("hwprobe() failed with %ld\n", rc); - return -1; - } + if (is_vector_supported()) + SKIP(return, "Test expects vector to be not supported"); =20 - if (pair.key !=3D RISCV_HWPROBE_KEY_IMA_EXT_0) { - ksft_test_result_fail("hwprobe cannot probe RISCV_HWPROBE_KEY_IMA_EXT_0\= n"); - return -2; - } + rc =3D prctl(PR_RISCV_V_GET_CONTROL); + EXPECT_EQ(-1, rc) TH_LOG("GET_CONTROL should fail on kernel/hw without ZV= E32X"); + EXPECT_EQ(EINVAL, errno) TH_LOG("GET_CONTROL should fail on kernel/hw wit= hout ZVE32X"); +} =20 - if (!(pair.value & RISCV_HWPROBE_EXT_ZVE32X)) { - rc =3D prctl(PR_RISCV_V_GET_CONTROL); - if (rc !=3D -1 || errno !=3D EINVAL) { - ksft_test_result_fail("GET_CONTROL should fail on kernel/hw without ZVE= 32X\n"); - return -3; - } - - rc =3D prctl(PR_RISCV_V_SET_CONTROL, PR_RISCV_V_VSTATE_CTRL_ON); - if (rc !=3D -1 || errno !=3D EINVAL) { - ksft_test_result_fail("SET_CONTROL should fail on kernel/hw without ZVE= 32X\n"); - return -4; - } - - ksft_test_result_skip("Vector not supported\n"); - return 0; - } +TEST(set_control_no_v) +{ + long rc; + + if (is_vector_supported()) + SKIP(return, "Test expects vector to be not supported"); + + rc =3D prctl(PR_RISCV_V_SET_CONTROL, PR_RISCV_V_VSTATE_CTRL_ON); + EXPECT_EQ(-1, rc) TH_LOG("SET_CONTROL should fail on kernel/hw without ZV= E32X"); + EXPECT_EQ(EINVAL, errno) TH_LOG("SET_CONTROL should fail on kernel/hw wit= hout ZVE32X"); +} + +TEST(vstate_on_current) +{ + long flag; + long rc; + + if (!is_vector_supported()) + SKIP(return, "Vector not supported"); =20 flag =3D PR_RISCV_V_VSTATE_CTRL_ON; rc =3D prctl(PR_RISCV_V_SET_CONTROL, flag); - if (rc !=3D 0) { - ksft_test_result_fail("Enabling V for current should always success\n"); - return -5; - } + EXPECT_EQ(0, rc) TH_LOG("Enabling V for current should always success"); +} + +TEST(vstate_off_eperm) +{ + long flag; + long rc; + + if (!is_vector_supported()) + SKIP(return, "Vector not supported"); =20 flag =3D PR_RISCV_V_VSTATE_CTRL_OFF; rc =3D prctl(PR_RISCV_V_SET_CONTROL, flag); - if (rc !=3D -1 || errno !=3D EPERM) { - ksft_test_result_fail("Disabling current's V alive must fail with EPERM(= %d)\n", - errno); - return -5; - } + EXPECT_EQ(EPERM, errno) TH_LOG("Disabling current's V alive must fail wit= h EPERM(%d)", errno); + EXPECT_EQ(-1, rc) TH_LOG("Disabling current's V alive must fail with EPER= M(%d)", errno); +} + +TEST(vstate_on_no_nesting) +{ + long flag; + + if (!is_vector_supported()) + SKIP(return, "Vector not supported"); =20 /* Turn on next's vector explicitly and test */ flag =3D PR_RISCV_V_VSTATE_CTRL_ON << PR_RISCV_V_VSTATE_CTRL_NEXT_SHIFT; - if (test_and_compare_child(flag, PR_RISCV_V_VSTATE_CTRL_ON, 0)) - return -6; + + EXPECT_EQ(0, test_and_compare_child(flag, PR_RISCV_V_VSTATE_CTRL_ON, 0)); +} + +TEST(vstate_off_nesting) +{ + long flag; + + if (!is_vector_supported()) + SKIP(return, "Vector not supported"); =20 /* Turn off next's vector explicitly and test */ flag =3D PR_RISCV_V_VSTATE_CTRL_OFF << PR_RISCV_V_VSTATE_CTRL_NEXT_SHIFT; - if (test_and_compare_child(flag, PR_RISCV_V_VSTATE_CTRL_OFF, 0)) - return -7; + + EXPECT_EQ(0, test_and_compare_child(flag, PR_RISCV_V_VSTATE_CTRL_OFF, 1)); +} + +TEST(vstate_on_inherit_no_nesting) +{ + long flag, expected; + + if (!is_vector_supported()) + SKIP(return, "Vector not supported"); + + /* Turn on next's vector explicitly and test no inherit */ + flag =3D PR_RISCV_V_VSTATE_CTRL_ON << PR_RISCV_V_VSTATE_CTRL_NEXT_SHIFT; + flag |=3D PR_RISCV_V_VSTATE_CTRL_INHERIT; + expected =3D flag | PR_RISCV_V_VSTATE_CTRL_ON; + + EXPECT_EQ(0, test_and_compare_child(flag, expected, 0)); +} + +TEST(vstate_on_inherit) +{ + long flag, expected; + + if (!is_vector_supported()) + SKIP(return, "Vector not supported"); =20 /* Turn on next's vector explicitly and test inherit */ flag =3D PR_RISCV_V_VSTATE_CTRL_ON << PR_RISCV_V_VSTATE_CTRL_NEXT_SHIFT; flag |=3D PR_RISCV_V_VSTATE_CTRL_INHERIT; expected =3D flag | PR_RISCV_V_VSTATE_CTRL_ON; - if (test_and_compare_child(flag, expected, 0)) - return -8; =20 - if (test_and_compare_child(flag, expected, 1)) - return -9; + EXPECT_EQ(0, test_and_compare_child(flag, expected, 1)); +} + +TEST(vstate_off_inherit_no_nesting) +{ + long flag, expected; + + if (!is_vector_supported()) + SKIP(return, "Vector not supported"); + + /* Turn off next's vector explicitly and test no inherit */ + flag =3D PR_RISCV_V_VSTATE_CTRL_OFF << PR_RISCV_V_VSTATE_CTRL_NEXT_SHIFT; + flag |=3D PR_RISCV_V_VSTATE_CTRL_INHERIT; + expected =3D flag | PR_RISCV_V_VSTATE_CTRL_OFF; + + EXPECT_EQ(0, test_and_compare_child(flag, expected, 0)); +} + +TEST(vstate_off_inherit) +{ + long flag, expected; + + if (!is_vector_supported()) + SKIP(return, "Vector not supported"); =20 /* Turn off next's vector explicitly and test inherit */ flag =3D PR_RISCV_V_VSTATE_CTRL_OFF << PR_RISCV_V_VSTATE_CTRL_NEXT_SHIFT; flag |=3D PR_RISCV_V_VSTATE_CTRL_INHERIT; expected =3D flag | PR_RISCV_V_VSTATE_CTRL_OFF; - if (test_and_compare_child(flag, expected, 0)) - return -10; =20 - if (test_and_compare_child(flag, expected, 1)) - return -11; + EXPECT_EQ(0, test_and_compare_child(flag, expected, 1)); +} + +/* arguments should fail with EINVAL */ +TEST(inval_set_control_1) +{ + int rc; + + if (!is_vector_supported()) + SKIP(return, "Vector not supported"); =20 - /* arguments should fail with EINVAL */ rc =3D prctl(PR_RISCV_V_SET_CONTROL, 0xff0); - if (rc !=3D -1 || errno !=3D EINVAL) { - ksft_test_result_fail("Undefined control argument should return EINVAL\n= "); - return -12; - } + EXPECT_EQ(-1, rc); + EXPECT_EQ(EINVAL, errno); +} + +/* arguments should fail with EINVAL */ +TEST(inval_set_control_2) +{ + int rc; + + if (!is_vector_supported()) + SKIP(return, "Vector not supported"); =20 rc =3D prctl(PR_RISCV_V_SET_CONTROL, 0x3); - if (rc !=3D -1 || errno !=3D EINVAL) { - ksft_test_result_fail("Undefined control argument should return EINVAL\n= "); - return -12; - } + EXPECT_EQ(-1, rc); + EXPECT_EQ(EINVAL, errno); +} =20 - rc =3D prctl(PR_RISCV_V_SET_CONTROL, 0xc); - if (rc !=3D -1 || errno !=3D EINVAL) { - ksft_test_result_fail("Undefined control argument should return EINVAL\n= "); - return -12; - } +/* arguments should fail with EINVAL */ +TEST(inval_set_control_3) +{ + int rc; =20 - rc =3D prctl(PR_RISCV_V_SET_CONTROL, 0xc); - if (rc !=3D -1 || errno !=3D EINVAL) { - ksft_test_result_fail("Undefined control argument should return EINVAL\n= "); - return -12; - } + if (!is_vector_supported()) + SKIP(return, "Vector not supported"); =20 - ksft_test_result_pass("tests for riscv_v_vstate_ctrl pass\n"); 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Fri, 19 Jul 2024 09:19:29 -0700 (PDT) From: Charlie Jenkins Date: Fri, 19 Jul 2024 09:19:08 -0700 Subject: [PATCH v5 13/13] selftests: riscv: Support xtheadvector in vector tests Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20240719-xtheadvector-v5-13-4b485fc7d55f@rivosinc.com> References: <20240719-xtheadvector-v5-0-4b485fc7d55f@rivosinc.com> In-Reply-To: <20240719-xtheadvector-v5-0-4b485fc7d55f@rivosinc.com> To: Conor Dooley , Rob Herring , Krzysztof Kozlowski , Paul Walmsley , Palmer Dabbelt , Albert Ou , Jisheng Zhang , Chen-Yu Tsai , Jernej Skrabec , Samuel Holland , Samuel Holland , Jonathan Corbet , Shuah Khan , Guo Ren , Evan Green , Andy Chiu , Jessica Clarke Cc: linux-riscv@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-sunxi@lists.linux.dev, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, Charlie Jenkins X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=ed25519-sha256; t=1721405940; l=13228; i=charlie@rivosinc.com; s=20231120; h=from:subject:message-id; bh=MyD6TcMYDjYjaX6KdKA6rKmU7max/ESmr05VGqeI8Sw=; b=WdB4feGWmYcTNRb2cimgCqMou6/BFSqY3k+DxCGwZbpXuGroj0pcPRqMj7+N9ZeEbY2mswnF3 PxX6Ef4V9cXDPgtRot3NNGuZY5Y9m7qmRlo2gTZVkLDzSbWBCzum44x X-Developer-Key: i=charlie@rivosinc.com; a=ed25519; pk=t4RSWpMV1q5lf/NWIeR9z58bcje60/dbtxxmoSfBEcs= Extend existing vector tests to be compatible with the xtheadvector instructions. Signed-off-by: Charlie Jenkins --- .../selftests/riscv/vector/v_exec_initval_nolibc.c | 23 ++++-- tools/testing/selftests/riscv/vector/v_helpers.c | 17 +++- tools/testing/selftests/riscv/vector/v_helpers.h | 4 +- tools/testing/selftests/riscv/vector/v_initval.c | 12 ++- .../selftests/riscv/vector/vstate_exec_nolibc.c | 20 +++-- .../testing/selftests/riscv/vector/vstate_prctl.c | 91 ++++++++++++++----= ---- 6 files changed, 115 insertions(+), 52 deletions(-) diff --git a/tools/testing/selftests/riscv/vector/v_exec_initval_nolibc.c b= /tools/testing/selftests/riscv/vector/v_exec_initval_nolibc.c index 74b13806baf0..6f40c2acc0c2 100644 --- a/tools/testing/selftests/riscv/vector/v_exec_initval_nolibc.c +++ b/tools/testing/selftests/riscv/vector/v_exec_initval_nolibc.c @@ -18,13 +18,22 @@ int main(int argc, char **argv) unsigned long vl; int first =3D 1; =20 - asm volatile ( - ".option push\n\t" - ".option arch, +v\n\t" - "vsetvli %[vl], x0, e8, m1, ta, ma\n\t" - ".option pop\n\t" - : [vl] "=3Dr" (vl) - ); + if (argc > 2 && strcmp(argv[2], "x")) + asm volatile ( + // 0 | zimm[10:0] | rs1 | 1 1 1 | rd |1010111| vsetvli + // vsetvli t4, x0, e8, m1, d1 + ".4byte 0b00000000000000000111111011010111\n\t" + "mv %[vl], t4\n\t" + : [vl] "=3Dr" (vl) : : "t4" + ); + else + asm volatile ( + ".option push\n\t" + ".option arch, +v\n\t" + "vsetvli %[vl], x0, e8, m1, ta, ma\n\t" + ".option pop\n\t" + : [vl] "=3Dr" (vl) + ); =20 #define CHECK_VECTOR_REGISTER(register) ({ \ for (int i =3D 0; i < vl; i++) { \ diff --git a/tools/testing/selftests/riscv/vector/v_helpers.c b/tools/testi= ng/selftests/riscv/vector/v_helpers.c index ca7525e8274e..424b219cb835 100644 --- a/tools/testing/selftests/riscv/vector/v_helpers.c +++ b/tools/testing/selftests/riscv/vector/v_helpers.c @@ -1,11 +1,21 @@ // SPDX-License-Identifier: GPL-2.0-only =20 #include "../hwprobe/hwprobe.h" +#include #include #include #include #include =20 +int is_xtheadvector_supported(void) +{ + struct riscv_hwprobe pair; + + pair.key =3D RISCV_HWPROBE_KEY_VENDOR_EXT_THEAD_0; + riscv_hwprobe(&pair, 1, 0, NULL, 0); + return pair.value & RISCV_HWPROBE_VENDOR_EXT_XTHEADVECTOR; +} + int is_vector_supported(void) { struct riscv_hwprobe pair; @@ -15,9 +25,9 @@ int is_vector_supported(void) return pair.value & RISCV_HWPROBE_EXT_ZVE32X; } =20 -int launch_test(char *next_program, int test_inherit) +int launch_test(char *next_program, int test_inherit, int xtheadvector) { - char *exec_argv[3], *exec_envp[1]; + char *exec_argv[4], *exec_envp[1]; int rc, pid, status; =20 pid =3D fork(); @@ -29,7 +39,8 @@ int launch_test(char *next_program, int test_inherit) if (!pid) { exec_argv[0] =3D next_program; exec_argv[1] =3D test_inherit !=3D 0 ? "x" : NULL; - exec_argv[2] =3D NULL; + exec_argv[2] =3D xtheadvector !=3D 0 ? "x" : NULL; + exec_argv[3] =3D NULL; exec_envp[0] =3D NULL; /* launch the program again to check inherit */ rc =3D execve(next_program, exec_argv, exec_envp); diff --git a/tools/testing/selftests/riscv/vector/v_helpers.h b/tools/testi= ng/selftests/riscv/vector/v_helpers.h index 88719c4be496..67d41cb6f871 100644 --- a/tools/testing/selftests/riscv/vector/v_helpers.h +++ b/tools/testing/selftests/riscv/vector/v_helpers.h @@ -1,5 +1,7 @@ /* SPDX-License-Identifier: GPL-2.0-only */ =20 +int is_xtheadvector_supported(void); + int is_vector_supported(void); =20 -int launch_test(char *next_program, int test_inherit); +int launch_test(char *next_program, int test_inherit, int xtheadvector); diff --git a/tools/testing/selftests/riscv/vector/v_initval.c b/tools/testi= ng/selftests/riscv/vector/v_initval.c index f38b5797fa31..be9e1d18ad29 100644 --- a/tools/testing/selftests/riscv/vector/v_initval.c +++ b/tools/testing/selftests/riscv/vector/v_initval.c @@ -7,10 +7,16 @@ =20 TEST(v_initval) { - if (!is_vector_supported()) - SKIP(return, "Vector not supported"); + int xtheadvector =3D 0; =20 - ASSERT_EQ(0, launch_test(NEXT_PROGRAM, 0)); + if (!is_vector_supported()) { + if (is_xtheadvector_supported()) + xtheadvector =3D 1; + else + SKIP(return, "Vector not supported"); + } + + ASSERT_EQ(0, launch_test(NEXT_PROGRAM, 0, xtheadvector)); } =20 TEST_HARNESS_MAIN diff --git a/tools/testing/selftests/riscv/vector/vstate_exec_nolibc.c b/to= ols/testing/selftests/riscv/vector/vstate_exec_nolibc.c index 1f9969bed235..7b7d6f21acb4 100644 --- a/tools/testing/selftests/riscv/vector/vstate_exec_nolibc.c +++ b/tools/testing/selftests/riscv/vector/vstate_exec_nolibc.c @@ -6,13 +6,16 @@ =20 int main(int argc, char **argv) { - int rc, pid, status, test_inherit =3D 0; + int rc, pid, status, test_inherit =3D 0, xtheadvector =3D 0; long ctrl, ctrl_c; char *exec_argv[2], *exec_envp[2]; =20 - if (argc > 1) + if (argc > 1 && strcmp(argv[1], "x")) test_inherit =3D 1; =20 + if (argc > 2 && strcmp(argv[2], "x")) + xtheadvector =3D 1; + ctrl =3D my_syscall1(__NR_prctl, PR_RISCV_V_GET_CONTROL); if (ctrl < 0) { puts("PR_RISCV_V_GET_CONTROL is not supported\n"); @@ -53,11 +56,14 @@ int main(int argc, char **argv) puts("child's vstate_ctrl not equal to parent's\n"); exit(-1); } - asm volatile (".option push\n\t" - ".option arch, +v\n\t" - "vsetvli x0, x0, e32, m8, ta, ma\n\t" - ".option pop\n\t" - ); + if (xtheadvector) + asm volatile (".4byte 0x00007ed7"); + else + asm volatile (".option push\n\t" + ".option arch, +v\n\t" + "vsetvli x0, x0, e32, m8, ta, ma\n\t" + ".option pop\n\t" + ); exit(ctrl); } } diff --git a/tools/testing/selftests/riscv/vector/vstate_prctl.c b/tools/te= sting/selftests/riscv/vector/vstate_prctl.c index 850a0caa226e..3d79f266cc65 100644 --- a/tools/testing/selftests/riscv/vector/vstate_prctl.c +++ b/tools/testing/selftests/riscv/vector/vstate_prctl.c @@ -11,7 +11,7 @@ =20 #define NEXT_PROGRAM "./vstate_exec_nolibc" =20 -int test_and_compare_child(long provided, long expected, int inherit) +int test_and_compare_child(long provided, long expected, int inherit, int = xtheadvector) { int rc; =20 @@ -21,7 +21,7 @@ int test_and_compare_child(long provided, long expected, = int inherit) provided, rc); return -1; } - rc =3D launch_test(NEXT_PROGRAM, inherit); + rc =3D launch_test(NEXT_PROGRAM, inherit, xtheadvector); if (rc !=3D expected) { printf("Test failed, check %d !=3D %ld\n", rc, expected); return -2; @@ -36,7 +36,7 @@ TEST(get_control_no_v) { long rc; =20 - if (is_vector_supported()) + if (is_vector_supported() || is_xtheadvector_supported()) SKIP(return, "Test expects vector to be not supported"); =20 rc =3D prctl(PR_RISCV_V_GET_CONTROL); @@ -48,7 +48,7 @@ TEST(set_control_no_v) { long rc; =20 - if (is_vector_supported()) + if (is_vector_supported() || is_xtheadvector_supported()) SKIP(return, "Test expects vector to be not supported"); =20 rc =3D prctl(PR_RISCV_V_SET_CONTROL, PR_RISCV_V_VSTATE_CTRL_ON); @@ -61,12 +61,12 @@ TEST(vstate_on_current) long flag; long rc; =20 - if (!is_vector_supported()) + if (!is_vector_supported() && !is_xtheadvector_supported()) SKIP(return, "Vector not supported"); =20 flag =3D PR_RISCV_V_VSTATE_CTRL_ON; rc =3D prctl(PR_RISCV_V_SET_CONTROL, flag); - EXPECT_EQ(0, rc) TH_LOG("Enabling V for current should always success"); + EXPECT_EQ(0, rc) TH_LOG("Enabling V for current should always succeed"); } =20 TEST(vstate_off_eperm) @@ -74,99 +74,128 @@ TEST(vstate_off_eperm) long flag; long rc; =20 - if (!is_vector_supported()) + if (!is_vector_supported() && !is_xtheadvector_supported()) SKIP(return, "Vector not supported"); =20 flag =3D PR_RISCV_V_VSTATE_CTRL_OFF; rc =3D prctl(PR_RISCV_V_SET_CONTROL, flag); - EXPECT_EQ(EPERM, errno) TH_LOG("Disabling current's V alive must fail wit= h EPERM(%d)", errno); - EXPECT_EQ(-1, rc) TH_LOG("Disabling current's V alive must fail with EPER= M(%d)", errno); + EXPECT_EQ(EPERM, errno) TH_LOG("Disabling V in current thread with V enab= led must fail with EPERM(%d)", errno); + EXPECT_EQ(-1, rc) TH_LOG("Disabling V in current thread with V enabled mu= st fail with EPERM(%d)", errno); } =20 TEST(vstate_on_no_nesting) { long flag; + int xtheadvector =3D 0; =20 - if (!is_vector_supported()) - SKIP(return, "Vector not supported"); + if (!is_vector_supported()) { + if (is_xtheadvector_supported()) + xtheadvector =3D 1; + else + SKIP(return, "Vector not supported"); + } =20 /* Turn on next's vector explicitly and test */ flag =3D PR_RISCV_V_VSTATE_CTRL_ON << PR_RISCV_V_VSTATE_CTRL_NEXT_SHIFT; =20 - EXPECT_EQ(0, test_and_compare_child(flag, PR_RISCV_V_VSTATE_CTRL_ON, 0)); + EXPECT_EQ(0, test_and_compare_child(flag, PR_RISCV_V_VSTATE_CTRL_ON, 0, x= theadvector)); } =20 TEST(vstate_off_nesting) { long flag; + int xtheadvector =3D 0; =20 - if (!is_vector_supported()) - SKIP(return, "Vector not supported"); + if (!is_vector_supported()) { + if (is_xtheadvector_supported()) + xtheadvector =3D 1; + else + SKIP(return, "Vector not supported"); + } =20 /* Turn off next's vector explicitly and test */ flag =3D PR_RISCV_V_VSTATE_CTRL_OFF << PR_RISCV_V_VSTATE_CTRL_NEXT_SHIFT; =20 - EXPECT_EQ(0, test_and_compare_child(flag, PR_RISCV_V_VSTATE_CTRL_OFF, 1)); + EXPECT_EQ(0, test_and_compare_child(flag, PR_RISCV_V_VSTATE_CTRL_OFF, 1, = xtheadvector)); } =20 TEST(vstate_on_inherit_no_nesting) { long flag, expected; + int xtheadvector =3D 0; =20 - if (!is_vector_supported()) - SKIP(return, "Vector not supported"); + if (!is_vector_supported()) { + if (is_xtheadvector_supported()) + xtheadvector =3D 1; + else + SKIP(return, "Vector not supported"); + } =20 /* Turn on next's vector explicitly and test no inherit */ flag =3D PR_RISCV_V_VSTATE_CTRL_ON << PR_RISCV_V_VSTATE_CTRL_NEXT_SHIFT; flag |=3D PR_RISCV_V_VSTATE_CTRL_INHERIT; expected =3D flag | PR_RISCV_V_VSTATE_CTRL_ON; =20 - EXPECT_EQ(0, test_and_compare_child(flag, expected, 0)); + EXPECT_EQ(0, test_and_compare_child(flag, expected, 0, xtheadvector)); } =20 TEST(vstate_on_inherit) { long flag, expected; + int xtheadvector =3D 0; =20 - if (!is_vector_supported()) - SKIP(return, "Vector not supported"); + if (!is_vector_supported()) { + if (is_xtheadvector_supported()) + xtheadvector =3D 1; + else + SKIP(return, "Vector not supported"); + } =20 /* Turn on next's vector explicitly and test inherit */ flag =3D PR_RISCV_V_VSTATE_CTRL_ON << PR_RISCV_V_VSTATE_CTRL_NEXT_SHIFT; flag |=3D PR_RISCV_V_VSTATE_CTRL_INHERIT; expected =3D flag | PR_RISCV_V_VSTATE_CTRL_ON; =20 - EXPECT_EQ(0, test_and_compare_child(flag, expected, 1)); + EXPECT_EQ(0, test_and_compare_child(flag, expected, 1, xtheadvector)); } =20 TEST(vstate_off_inherit_no_nesting) { long flag, expected; + int xtheadvector =3D 0; =20 - if (!is_vector_supported()) - SKIP(return, "Vector not supported"); - + if (!is_vector_supported()) { + if (is_xtheadvector_supported()) + xtheadvector =3D 1; + else + SKIP(return, "Vector not supported"); + } /* Turn off next's vector explicitly and test no inherit */ flag =3D PR_RISCV_V_VSTATE_CTRL_OFF << PR_RISCV_V_VSTATE_CTRL_NEXT_SHIFT; flag |=3D PR_RISCV_V_VSTATE_CTRL_INHERIT; expected =3D flag | PR_RISCV_V_VSTATE_CTRL_OFF; =20 - EXPECT_EQ(0, test_and_compare_child(flag, expected, 0)); + EXPECT_EQ(0, test_and_compare_child(flag, expected, 0, xtheadvector)); } =20 TEST(vstate_off_inherit) { long flag, expected; + int xtheadvector =3D 0; =20 - if (!is_vector_supported()) - SKIP(return, "Vector not supported"); + if (!is_vector_supported()) { + if (is_xtheadvector_supported()) + xtheadvector =3D 1; + else + SKIP(return, "Vector not supported"); + } =20 /* Turn off next's vector explicitly and test inherit */ flag =3D PR_RISCV_V_VSTATE_CTRL_OFF << PR_RISCV_V_VSTATE_CTRL_NEXT_SHIFT; flag |=3D PR_RISCV_V_VSTATE_CTRL_INHERIT; expected =3D flag | PR_RISCV_V_VSTATE_CTRL_OFF; =20 - EXPECT_EQ(0, test_and_compare_child(flag, expected, 1)); + EXPECT_EQ(0, test_and_compare_child(flag, expected, 1, xtheadvector)); } =20 /* arguments should fail with EINVAL */ @@ -174,7 +203,7 @@ TEST(inval_set_control_1) { int rc; =20 - if (!is_vector_supported()) + if (!is_vector_supported() && !is_xtheadvector_supported()) SKIP(return, "Vector not supported"); =20 rc =3D prctl(PR_RISCV_V_SET_CONTROL, 0xff0); @@ -187,7 +216,7 @@ TEST(inval_set_control_2) { int rc; =20 - if (!is_vector_supported()) + if (!is_vector_supported() && !is_xtheadvector_supported()) SKIP(return, "Vector not supported"); =20 rc =3D prctl(PR_RISCV_V_SET_CONTROL, 0x3); @@ -200,7 +229,7 @@ TEST(inval_set_control_3) { int rc; =20 - if (!is_vector_supported()) + if (!is_vector_supported() && !is_xtheadvector_supported()) SKIP(return, "Vector not supported"); =20 rc =3D prctl(PR_RISCV_V_SET_CONTROL, 0xc); --=20 2.44.0