xtheadvector is a custom extension that is based upon riscv vector version 0.7.1 [1]. All of the vector routines have been modified to support this alternative vector version based upon whether xtheadvector was determined to be supported at boot.
vlenb is not supported on the existing xtheadvector hardware, so a devicetree property thead,vlenb is added to provide the vlenb to Linux.
There is a new hwprobe key RISCV_HWPROBE_KEY_VENDOR_EXT_THEAD_0 that is used to request which thead vendor extensions are supported on the current platform. This allows future vendors to allocate hwprobe keys for their vendor.
Support for xtheadvector is also added to the vector kselftests.
Signed-off-by: Charlie Jenkins charlie@rivosinc.com
[1] https://github.com/T-head-Semi/thead-extension-spec/blob/95358cb2cca9489361c...
--- This series is a continuation of a different series that was fragmented into two other series in an attempt to get part of it merged in the 6.10 merge window. The split-off series did not get merged due to a NAK on the series that added the generic riscv,vlenb devicetree entry. This series has converted riscv,vlenb to thead,vlenb to remedy this issue.
The original series is titled "riscv: Support vendor extensions and xtheadvector" [3].
The series titled "riscv: Extend cpufeature.c to detect vendor extensions" is still under development and this series is based on that series! [4]
I have tested this with an Allwinner Nezha board. I ran into issues booting the board after 6.9-rc1 so I applied these patches to 6.8. There are a couple of minor merge conflicts that do arrise when doing that, so please let me know if you have been able to boot this board with a 6.9 kernel. I used SkiffOS [1] to manage building the image, but upgraded the U-Boot version to Samuel Holland's more up-to-date version [2] and changed out the device tree used by U-Boot with the device trees that are present in upstream linux and this series. Thank you Samuel for all of the work you did to make this task possible.
[1] https://github.com/skiffos/SkiffOS/tree/master/configs/allwinner/nezha [2] https://github.com/smaeul/u-boot/commit/2e89b706f5c956a70c989cd31665f1429e9a... [3] https://lore.kernel.org/all/20240503-dev-charlie-support_thead_vector_6_9-v6... [4] https://lore.kernel.org/linux-riscv/20240609-support_vendor_extensions-v2-0-...
--- Changes in v3: - Add back Heiko's signed-off-by (Conor) - Mark RISCV_HWPROBE_KEY_VENDOR_EXT_THEAD_0 as a bitmask - Link to v2: https://lore.kernel.org/r/20240610-xtheadvector-v2-0-97a48613ad64@rivosinc.c...
Changes in v2: - Removed extraneous references to "riscv,vlenb" (Jess) - Moved declaration of "thead,vlenb" into cpus.yaml and added restriction that it's only applicable to thead cores (Conor) - Check CONFIG_RISCV_ISA_XTHEADVECTOR instead of CONFIG_RISCV_ISA_V for thead,vlenb (Jess) - Fix naming of hwprobe variables (Evan) - Link to v1: https://lore.kernel.org/r/20240609-xtheadvector-v1-0-3fe591d7f109@rivosinc.c...
--- Charlie Jenkins (12): dt-bindings: riscv: Add xtheadvector ISA extension description dt-bindings: cpus: add a thead vlen register length property riscv: dts: allwinner: Add xtheadvector to the D1/D1s devicetree riscv: Add thead and xtheadvector as a vendor extension riscv: vector: Use vlenb from DT for thead riscv: csr: Add CSR encodings for VCSR_VXRM/VCSR_VXSAT riscv: Add xtheadvector instruction definitions riscv: vector: Support xtheadvector save/restore riscv: hwprobe: Add thead vendor extension probing riscv: hwprobe: Document thead vendor extensions and xtheadvector extension selftests: riscv: Fix vector tests selftests: riscv: Support xtheadvector in vector tests
Heiko Stuebner (1): RISC-V: define the elements of the VCSR vector CSR
Documentation/arch/riscv/hwprobe.rst | 10 + Documentation/devicetree/bindings/riscv/cpus.yaml | 19 ++ .../devicetree/bindings/riscv/extensions.yaml | 10 + arch/riscv/Kconfig.vendor | 26 ++ arch/riscv/boot/dts/allwinner/sun20i-d1s.dtsi | 3 +- arch/riscv/include/asm/cpufeature.h | 2 + arch/riscv/include/asm/csr.h | 13 + arch/riscv/include/asm/hwprobe.h | 5 +- arch/riscv/include/asm/switch_to.h | 2 +- arch/riscv/include/asm/vector.h | 249 +++++++++++++---- arch/riscv/include/asm/vendor_extensions/thead.h | 42 +++ .../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/cpufeature.c | 51 +++- arch/riscv/kernel/kernel_mode_vector.c | 8 +- arch/riscv/kernel/process.c | 4 +- arch/riscv/kernel/signal.c | 6 +- arch/riscv/kernel/sys_hwprobe.c | 5 + arch/riscv/kernel/vector.c | 25 +- arch/riscv/kernel/vendor_extensions.c | 10 + arch/riscv/kernel/vendor_extensions/Makefile | 2 + arch/riscv/kernel/vendor_extensions/thead.c | 18 ++ .../riscv/kernel/vendor_extensions/thead_hwprobe.c | 19 ++ tools/testing/selftests/riscv/vector/.gitignore | 3 +- tools/testing/selftests/riscv/vector/Makefile | 17 +- .../selftests/riscv/vector/v_exec_initval_nolibc.c | 93 +++++++ tools/testing/selftests/riscv/vector/v_helpers.c | 67 +++++ tools/testing/selftests/riscv/vector/v_helpers.h | 7 + tools/testing/selftests/riscv/vector/v_initval.c | 22 ++ .../selftests/riscv/vector/v_initval_nolibc.c | 68 ----- .../selftests/riscv/vector/vstate_exec_nolibc.c | 20 +- .../testing/selftests/riscv/vector/vstate_prctl.c | 295 ++++++++++++--------- 34 files changed, 911 insertions(+), 271 deletions(-) --- base-commit: 11cc01d4d2af304b7288251aad7e03315db8dffc change-id: 20240530-xtheadvector-833d3d17b423
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/95358cb2cca9489361c... [1]
Signed-off-by: Charlie Jenkins charlie@rivosinc.com Reviewed-by: Conor Dooley conor.dooley@microchip.com --- Documentation/devicetree/bindings/riscv/extensions.yaml | 10 ++++++++++ 1 file changed, 10 insertions(+)
diff --git a/Documentation/devicetree/bindings/riscv/extensions.yaml b/Documentation/devicetree/bindings/riscv/extensions.yaml index 468c646247aa..99d2a9e8c52d 100644 --- a/Documentation/devicetree/bindings/riscv/extensions.yaml +++ b/Documentation/devicetree/bindings/riscv/extensions.yaml @@ -477,6 +477,10 @@ properties: latency, as ratified in commit 56ed795 ("Update riscv-crypto-spec-vector.adoc") of riscv-crypto.
+ # vendor extensions, each extension sorted alphanumerically under the + # vendor they belong to. Vendors are sorted alphanumerically as well. + + # Andes - const: xandespmu description: The Andes Technology performance monitor extension for counter overflow @@ -484,5 +488,11 @@ properties: Registers in the AX45MP datasheet. https://www.andestech.com/wp-content/uploads/AX45MP-1C-Rev.-5.0.0-Datasheet....
+ # 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/95358cb2cca9489361c.... + additionalProperties: true ...
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 charlie@rivosinc.com Reviewed-by: Conor Dooley conor.dooley@microchip.com --- Documentation/devicetree/bindings/riscv/cpus.yaml | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+)
diff --git a/Documentation/devicetree/bindings/riscv/cpus.yaml b/Documentation/devicetree/bindings/riscv/cpus.yaml index d87dd50f1a4b..a6bbbf658977 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
properties: compatible: @@ -94,6 +106,13 @@ properties: description: The blocksize in bytes for the Zicboz cache operations.
+ thead,vlenb: + $ref: /schemas/types.yaml#/definitions/uint32 + description: + VLEN/8, the vector register length in bytes. This property is required on + thead systems where the vector register length is not identical on all harts, or + the vlenb CSR is not available. + # RISC-V has multiple properties for cache op block sizes as the sizes # differ between individual CBO extensions cache-op-block-size: false
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 charlie@rivosinc.com Reviewed-by: Conor Dooley conor.dooley@microchip.com --- 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/boot/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 = "rv64imafdc"; riscv,isa-base = "rv64i"; riscv,isa-extensions = "i", "m", "a", "f", "d", "c", "zicntr", "zicsr", - "zifencei", "zihpm"; + "zifencei", "zihpm", "xtheadvector"; + thead,vlenb = <128>; #cooling-cells = <2>;
cpu0_intc: interrupt-controller {
On Thu, Jun 20, 2024 at 7:57 AM Charlie Jenkins charlie@rivosinc.com wrote:
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 charlie@rivosinc.com Reviewed-by: Conor Dooley conor.dooley@microchip.com
Acked-by: Chen-Yu Tsai wens@csie.org
If the RISC-V maintainers want to take the whole series.
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/boot/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 = "rv64imafdc"; riscv,isa-base = "rv64i"; riscv,isa-extensions = "i", "m", "a", "f", "d", "c", "zicntr", "zicsr",
"zifencei", "zihpm";
"zifencei", "zihpm", "xtheadvector";thead,vlenb = <128>; #cooling-cells = <2>; cpu0_intc: interrupt-controller {-- 2.34.1
Hi Charlie,
On 2024-06-19 6:57 PM, Charlie Jenkins wrote:
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 charlie@rivosinc.com Reviewed-by: Conor Dooley conor.dooley@microchip.com
arch/riscv/boot/dts/allwinner/sun20i-d1s.dtsi | 3 ++-
The other C906/C910/C920-based SoCs need devicetree updates as well, although they don't necessarily need to be part of this series:
- sophgo/cv18xx.dtsi - sophgo/sg2042-cpus.dtsi - thead/th1520.dtsi
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/riscv/boot/dts/allwinner/sun20i-d1s.dtsi b/arch/riscv/boot/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 = "rv64imafdc";
The ISA string should be updated to keep it in sync with riscv,isa-extensions.
Regards, Samuel
riscv,isa-base = "rv64i"; riscv,isa-extensions = "i", "m", "a", "f", "d", "c", "zicntr", "zicsr",
"zifencei", "zihpm";
"zifencei", "zihpm", "xtheadvector";thead,vlenb = <128>; #cooling-cells = <2>;cpu0_intc: interrupt-controller {
On Mon, Jul 01, 2024 at 10:27:01AM -0500, Samuel Holland wrote:
Hi Charlie,
On 2024-06-19 6:57 PM, Charlie Jenkins wrote:
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 charlie@rivosinc.com Reviewed-by: Conor Dooley conor.dooley@microchip.com
arch/riscv/boot/dts/allwinner/sun20i-d1s.dtsi | 3 ++-
The other C906/C910/C920-based SoCs need devicetree updates as well, although they don't necessarily need to be part of this series:
- sophgo/cv18xx.dtsi
- sophgo/sg2042-cpus.dtsi
- thead/th1520.dtsi
Yeah, I think I pointed that out before with the same "escape hatch" of it not needing to be in the same series.
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/riscv/boot/dts/allwinner/sun20i-d1s.dtsi b/arch/riscv/boot/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 = "rv64imafdc";
The ISA string should be updated to keep it in sync with riscv,isa-extensions.
This probably looks like this cos I said that the kernel shouldn't parse vendor extensions from "riscv,isa". My rationale was that we have basically no control of what a vendor extension means in riscv,isa so we shouldn't parse them from it (so marginally worse than standard extensions, where it means what the spec says except when it doesn't).
Given how we implement the parsing, it also meant we weren't implying meanings for vendor extensions ACPI-land, where we also can't ensure the meanings or that they remain stable. That change is in a different series: https://patchwork.kernel.org/project/linux-riscv/patch/20240609-support_vend...
Although now that I think about it, this might break xandespmu... I dunno if the Andes guys switched over to using the new property outside of the single dts in the kernel tree using their SoC. We could potentially special-case that extension if they haven't - but my position on this mostly is that if you want to use vendor extensions you should not be using riscv,isa (even if the regex doesn't complain if you add them). I'd like to leave the code in the other patch as-is if we can help it.
I added Yu Chien Peter Lin here, maybe they can let us know what they're doing.
Thanks, Conor.
Hi Conor, Charlie,
On 2024-07-01 11:07 AM, Conor Dooley wrote:
On Mon, Jul 01, 2024 at 10:27:01AM -0500, Samuel Holland wrote:
On 2024-06-19 6:57 PM, Charlie Jenkins wrote:
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 charlie@rivosinc.com Reviewed-by: Conor Dooley conor.dooley@microchip.com
arch/riscv/boot/dts/allwinner/sun20i-d1s.dtsi | 3 ++-
The other C906/C910/C920-based SoCs need devicetree updates as well, although they don't necessarily need to be part of this series:
- sophgo/cv18xx.dtsi
- sophgo/sg2042-cpus.dtsi
- thead/th1520.dtsi
Yeah, I think I pointed that out before with the same "escape hatch" of it not needing to be in the same series.
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/riscv/boot/dts/allwinner/sun20i-d1s.dtsi b/arch/riscv/boot/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 = "rv64imafdc";
The ISA string should be updated to keep it in sync with riscv,isa-extensions.
This probably looks like this cos I said that the kernel shouldn't parse vendor extensions from "riscv,isa". My rationale was that we have basically no control of what a vendor extension means in riscv,isa so we shouldn't parse them from it (so marginally worse than standard extensions, where it means what the spec says except when it doesn't).
Given how we implement the parsing, it also meant we weren't implying meanings for vendor extensions ACPI-land, where we also can't ensure the meanings or that they remain stable. That change is in a different series: https://patchwork.kernel.org/project/linux-riscv/patch/20240609-support_vend...
Although now that I think about it, this might break xandespmu... I dunno if the Andes guys switched over to using the new property outside of the single dts in the kernel tree using their SoC. We could potentially special-case that extension if they haven't - but my position on this mostly is that if you want to use vendor extensions you should not be using riscv,isa (even if the regex doesn't complain if you add them). I'd like to leave the code in the other patch as-is if we can help it.
I added Yu Chien Peter Lin here, maybe they can let us know what they're doing.
OK, that makes sense to me. Then please ignore my original comment.
Regards, Samuel
On Mon, Jul 01, 2024 at 11:11:55AM -0500, Samuel Holland wrote:
Hi Conor, Charlie,
On 2024-07-01 11:07 AM, Conor Dooley wrote:
On Mon, Jul 01, 2024 at 10:27:01AM -0500, Samuel Holland wrote:
On 2024-06-19 6:57 PM, Charlie Jenkins wrote:
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 charlie@rivosinc.com Reviewed-by: Conor Dooley conor.dooley@microchip.com
arch/riscv/boot/dts/allwinner/sun20i-d1s.dtsi | 3 ++-
The other C906/C910/C920-based SoCs need devicetree updates as well, although they don't necessarily need to be part of this series:
- sophgo/cv18xx.dtsi
- sophgo/sg2042-cpus.dtsi
- thead/th1520.dtsi
Yeah, I think I pointed that out before with the same "escape hatch" of it not needing to be in the same series.
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/riscv/boot/dts/allwinner/sun20i-d1s.dtsi b/arch/riscv/boot/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 = "rv64imafdc";
The ISA string should be updated to keep it in sync with riscv,isa-extensions.
This probably looks like this cos I said that the kernel shouldn't parse vendor extensions from "riscv,isa". My rationale was that we have basically no control of what a vendor extension means in riscv,isa so we shouldn't parse them from it (so marginally worse than standard extensions, where it means what the spec says except when it doesn't).
Given how we implement the parsing, it also meant we weren't implying meanings for vendor extensions ACPI-land, where we also can't ensure the meanings or that they remain stable. That change is in a different series: https://patchwork.kernel.org/project/linux-riscv/patch/20240609-support_vend...
Although now that I think about it, this might break xandespmu... I dunno if the Andes guys switched over to using the new property outside of the single dts in the kernel tree using their SoC. We could potentially special-case that extension if they haven't - but my position on this mostly is that if you want to use vendor extensions you should not be using riscv,isa (even if the regex doesn't complain if you add them). I'd like to leave the code in the other patch as-is if we can help it.
I added Yu Chien Peter Lin here, maybe they can let us know what they're doing.
OK, that makes sense to me. Then please ignore my original comment.
Should the xandespmu thing be an issue, I'd suggest we just do something like the following, in place of the new switch arm added by Charlie:
diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c index ec4bff7a827c..bb99b4055ec2 100644 --- a/arch/riscv/kernel/cpufeature.c +++ b/arch/riscv/kernel/cpufeature.c @@ -628,6 +628,17 @@ static void __init riscv_parse_isa_string(const char *isa, unsigned long *bitmap if (unlikely(ext_err)) continue;
+ if (*ext == 'x' && acpi_disabled) { + /* + * xandespmu predates this "rule", so special case it for + * hysterical raisins + */ + if (strncasecmp(ext, "xandespmu", ext_end - ext)) { + pr_warn_once("Vendor extensions are ignored in riscv,isa. Use riscv,isa-extensions instead."); + break; + } + } + match_isa_ext(ext, ext_end, bitmap); } }
Hi Conor,
On Mon, Jul 01, 2024 at 05:31:01PM +0100, Conor Dooley wrote:
[EXTERNAL MAIL]
Date: Mon, 1 Jul 2024 17:31:01 +0100 From: Conor Dooley conor@kernel.org To: Samuel Holland samuel.holland@sifive.com Cc: Charlie Jenkins charlie@rivosinc.com, 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, Conor Dooley conor.dooley@microchip.com, Rob Herring robh@kernel.org, Krzysztof Kozlowski krzk+dt@kernel.org, Paul Walmsley paul.walmsley@sifive.com, Palmer Dabbelt palmer@dabbelt.com, Albert Ou aou@eecs.berkeley.edu, Jisheng Zhang jszhang@kernel.org, Chen-Yu Tsai wens@csie.org, Jernej Skrabec jernej.skrabec@gmail.com, Samuel Holland samuel@sholland.org, Jonathan Corbet corbet@lwn.net, Shuah Khan shuah@kernel.org, Guo Ren guoren@kernel.org, Evan Green evan@rivosinc.com, Andy Chiu andy.chiu@sifive.com, Jessica Clarke jrtc27@jrtc27.com, peterlin@andestech.com Subject: Re: [PATCH v3 03/13] riscv: dts: allwinner: Add xtheadvector to the D1/D1s devicetree
On Mon, Jul 01, 2024 at 11:11:55AM -0500, Samuel Holland wrote:
Hi Conor, Charlie,
On 2024-07-01 11:07 AM, Conor Dooley wrote:
On Mon, Jul 01, 2024 at 10:27:01AM -0500, Samuel Holland wrote:
On 2024-06-19 6:57 PM, Charlie Jenkins wrote:
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 charlie@rivosinc.com Reviewed-by: Conor Dooley conor.dooley@microchip.com
arch/riscv/boot/dts/allwinner/sun20i-d1s.dtsi | 3 ++-
The other C906/C910/C920-based SoCs need devicetree updates as well, although they don't necessarily need to be part of this series:
- sophgo/cv18xx.dtsi
- sophgo/sg2042-cpus.dtsi
- thead/th1520.dtsi
Yeah, I think I pointed that out before with the same "escape hatch" of it not needing to be in the same series.
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/riscv/boot/dts/allwinner/sun20i-d1s.dtsi b/arch/riscv/boot/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 = "rv64imafdc";
The ISA string should be updated to keep it in sync with riscv,isa-extensions.
This probably looks like this cos I said that the kernel shouldn't parse vendor extensions from "riscv,isa". My rationale was that we have basically no control of what a vendor extension means in riscv,isa so we shouldn't parse them from it (so marginally worse than standard extensions, where it means what the spec says except when it doesn't).
Given how we implement the parsing, it also meant we weren't implying meanings for vendor extensions ACPI-land, where we also can't ensure the meanings or that they remain stable. That change is in a different series: https://patchwork.kernel.org/project/linux-riscv/patch/20240609-support_vend...
Although now that I think about it, this might break xandespmu... I dunno if the Andes guys switched over to using the new property outside of the single dts in the kernel tree using their SoC. We could potentially special-case that extension if they haven't - but my position on this mostly is that if you want to use vendor extensions you should not be using riscv,isa (even if the regex doesn't complain if you add them). I'd like to leave the code in the other patch as-is if we can help it.
I added Yu Chien Peter Lin here, maybe they can let us know what they're doing.
OK, that makes sense to me. Then please ignore my original comment.
Should the xandespmu thing be an issue, I'd suggest we just do something like the following, in place of the new switch arm added by Charlie:
diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c index ec4bff7a827c..bb99b4055ec2 100644 --- a/arch/riscv/kernel/cpufeature.c +++ b/arch/riscv/kernel/cpufeature.c @@ -628,6 +628,17 @@ static void __init riscv_parse_isa_string(const char *isa, unsigned long *bitmap if (unlikely(ext_err)) continue;
if (*ext == 'x' && acpi_disabled) {/** xandespmu predates this "rule", so special case it for* hysterical raisins*/if (strncasecmp(ext, "xandespmu", ext_end - ext)) {pr_warn_once("Vendor extensions are ignored in riscv,isa. Use riscv,isa-extensions instead.");break;}}- match_isa_ext(ext, ext_end, bitmap); }
}
Thanks for the hands-up! We don't use the deprecated riscv,isa to specify xandespmu, so no need to address this special case.
Regards, Peter Lin
On Tue, Jul 02, 2024 at 05:46:42PM +0800, Yu-Chien Peter Lin wrote:
On Mon, Jul 01, 2024 at 05:31:01PM +0100, Conor Dooley wrote:
On Mon, Jul 01, 2024 at 11:11:55AM -0500, Samuel Holland wrote:
Hi Conor, Charlie,
On 2024-07-01 11:07 AM, Conor Dooley wrote:
On Mon, Jul 01, 2024 at 10:27:01AM -0500, Samuel Holland wrote:
On 2024-06-19 6:57 PM, Charlie Jenkins wrote:
diff --git a/arch/riscv/boot/dts/allwinner/sun20i-d1s.dtsi b/arch/riscv/boot/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 = "rv64imafdc";
The ISA string should be updated to keep it in sync with riscv,isa-extensions.
This probably looks like this cos I said that the kernel shouldn't parse vendor extensions from "riscv,isa". My rationale was that we have basically no control of what a vendor extension means in riscv,isa so we shouldn't parse them from it (so marginally worse than standard extensions, where it means what the spec says except when it doesn't).
Given how we implement the parsing, it also meant we weren't implying meanings for vendor extensions ACPI-land, where we also can't ensure the meanings or that they remain stable. That change is in a different series: https://patchwork.kernel.org/project/linux-riscv/patch/20240609-support_vend...
Although now that I think about it, this might break xandespmu... I dunno if the Andes guys switched over to using the new property outside of the single dts in the kernel tree using their SoC. We could potentially special-case that extension if they haven't - but my position on this mostly is that if you want to use vendor extensions you should not be using riscv,isa (even if the regex doesn't complain if you add them). I'd like to leave the code in the other patch as-is if we can help it.
I added Yu Chien Peter Lin here, maybe they can let us know what they're doing.
OK, that makes sense to me. Then please ignore my original comment.
Should the xandespmu thing be an issue, I'd suggest we just do something like the following, in place of the new switch arm added by Charlie:
diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c index ec4bff7a827c..bb99b4055ec2 100644 --- a/arch/riscv/kernel/cpufeature.c +++ b/arch/riscv/kernel/cpufeature.c @@ -628,6 +628,17 @@ static void __init riscv_parse_isa_string(const char *isa, unsigned long *bitmap if (unlikely(ext_err)) continue;
if (*ext == 'x' && acpi_disabled) {/** xandespmu predates this "rule", so special case it for* hysterical raisins*/if (strncasecmp(ext, "xandespmu", ext_end - ext)) {pr_warn_once("Vendor extensions are ignored in riscv,isa. Use riscv,isa-extensions instead.");break;}}- match_isa_ext(ext, ext_end, bitmap); }
}
Thanks for the hands-up! We don't use the deprecated riscv,isa to specify xandespmu, so no need to address this special case.
Great, that's good to know - thanks!
Add support to the kernel for THead vendor extensions with the target of the new extension xtheadvector.
Signed-off-by: Charlie Jenkins charlie@rivosinc.com Reviewed-by: Conor Dooley conor.dooley@microchip.com --- 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
+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 <asm/vendor_extensions.h> + +#include <linux/types.h> + +/* + * 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_thead; + +#endif diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c index f2c24820700b..2107c59575dd 100644 --- a/arch/riscv/kernel/cpufeature.c +++ b/arch/riscv/kernel/cpufeature.c @@ -25,6 +25,7 @@ #include <asm/sbi.h> #include <asm/vector.h> #include <asm/vendor_extensions.h> +#include <asm/vendor_extensions/thead.h>
#define NUM_ALPHA_EXTS ('z' - 'a' + 1)
diff --git a/arch/riscv/kernel/vendor_extensions.c b/arch/riscv/kernel/vendor_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 <asm/vendorid_list.h> #include <asm/vendor_extensions.h> #include <asm/vendor_extensions/andes.h> +#include <asm/vendor_extensions/thead.h>
#include <linux/array_size.h> #include <linux/types.h> @@ -14,6 +15,9 @@ struct riscv_isa_vendor_ext_data_list *riscv_isa_vendor_ext_list[] = { #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 };
const size_t riscv_isa_vendor_ext_list_size = ARRAY_SIZE(riscv_isa_vendor_ext_list); @@ -41,6 +45,12 @@ bool __riscv_isa_vendor_extension_available(int cpu, unsigned long vendor, unsig cpu_bmap = &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 = &riscv_isa_vendor_ext_list_thead.all_harts_isa_bitmap; + cpu_bmap = &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/kernel/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
obj-$(CONFIG_RISCV_ISA_VENDOR_EXT_ANDES) += andes.o +obj-$(CONFIG_RISCV_ISA_VENDOR_EXT_THEAD) += thead.o diff --git a/arch/riscv/kernel/vendor_extensions/thead.c b/arch/riscv/kernel/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 <asm/cpufeature.h> +#include <asm/vendor_extensions.h> +#include <asm/vendor_extensions/thead.h> + +#include <linux/array_size.h> +#include <linux/types.h> + +/* All T-Head vendor extensions supported in Linux */ +const struct riscv_isa_ext_data riscv_isa_vendor_ext_thead[] = { + __RISCV_ISA_EXT_DATA(xtheadvector, RISCV_ISA_VENDOR_EXT_XTHEADVECTOR), +}; + +struct riscv_isa_vendor_ext_data_list riscv_isa_vendor_ext_list_thead = { + .ext_data_count = ARRAY_SIZE(riscv_isa_vendor_ext_thead), + .ext_data = riscv_isa_vendor_ext_thead, +};
If thead,vlenb is provided in the device tree, prefer that over reading the vlenb csr.
Signed-off-by: Charlie Jenkins charlie@rivosinc.com --- 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.
+ 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
diff --git a/arch/riscv/include/asm/cpufeature.h b/arch/riscv/include/asm/cpufeature.h index b029ca72cebc..e0a3164c7a06 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];
+extern u32 thead_vlenb_of; + void riscv_user_isa_enable(void);
#define _RISCV_ISA_EXT_DATA(_name, _id, _subset_exts, _subset_exts_size) { \ diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c index 2107c59575dd..077be4ab1f9a 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) __read_mostly; /* Per-cpu ISA extensions. */ struct riscv_isainfo hart_isa[NR_CPUS];
+u32 thead_vlenb_of; + /** * riscv_isa_extension_base() - Get base extension word * @@ -625,6 +627,46 @@ static void __init riscv_fill_vendor_ext_list(int cpu) } }
+static int has_thead_homogeneous_vlenb(void) +{ + int cpu; + u32 prev_vlenb = 0; + u32 vlenb; + + /* Ignore thead,vlenb property if xtheavector is not enabled in the kernel */ + if (!IS_ENABLED(CONFIG_RISCV_ISA_XTHEADVECTOR)) + return 0; + + for_each_possible_cpu(cpu) { + struct device_node *cpu_node; + + cpu_node = 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 != prev_vlenb) { + of_node_put(cpu_node); + return -ENOENT; + } + + prev_vlenb = vlenb; + of_node_put(cpu_node); + } + + thead_vlenb_of = vlenb; + return 0; +} + static int __init riscv_fill_hwcap_from_ext_list(unsigned long *isa2hwcap) { unsigned int cpu; @@ -689,6 +731,12 @@ static int __init riscv_fill_hwcap_from_ext_list(unsigned long *isa2hwcap) riscv_fill_vendor_ext_list(cpu); }
+ if (riscv_isa_vendor_extension_available(THEAD_VENDOR_ID, XTHEADVECTOR) && + has_thead_homogeneous_vlenb() < 0) { + pr_warn("Unsupported heterogeneous vlenb detected, vector extension disabled.\n"); + elf_hwcap &= ~COMPAT_HWCAP_ISA_V; + } + if (bitmap_empty(riscv_isa, RISCV_ISA_EXT_MAX)) return -ENOENT;
diff --git a/arch/riscv/kernel/vector.c b/arch/riscv/kernel/vector.c index 6727d1d3b8f2..3ba2f2432483 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;
- /* 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 = thead_vlenb_of * 32; + return 0; + } + riscv_v_enable(); this_vsize = csr_read(CSR_VLENB) * 32; riscv_v_disable();
On Wed, Jun 19, 2024 at 04:57:18PM -0700, Charlie Jenkins wrote:
If thead,vlenb is provided in the device tree, prefer that over reading the vlenb csr.
Signed-off-by: Charlie Jenkins charlie@rivosinc.com
Acked-by: Conor Dooley conor.dooley@microchip.com
On Thu, Jun 20, 2024 at 7:57 AM Charlie Jenkins charlie@rivosinc.com wrote:
If thead,vlenb is provided in the device tree, prefer that over reading the vlenb csr.
Signed-off-by: Charlie Jenkins charlie@rivosinc.com
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.
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_THEADdepends on RISCV_ISA_Vdepends on FPUdefault yhelpSay N here if you want to disable all xtheadvector related proceduresin the kernel. This will disable vector for any T-Head board thatcontains xtheadvector rather than the standard vector.If you don't know what to do here, say Y.endmenu
diff --git a/arch/riscv/include/asm/cpufeature.h b/arch/riscv/include/asm/cpufeature.h index b029ca72cebc..e0a3164c7a06 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];
+extern u32 thead_vlenb_of;
void riscv_user_isa_enable(void);
#define _RISCV_ISA_EXT_DATA(_name, _id, _subset_exts, _subset_exts_size) { \ diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c index 2107c59575dd..077be4ab1f9a 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) __read_mostly; /* Per-cpu ISA extensions. */ struct riscv_isainfo hart_isa[NR_CPUS];
+u32 thead_vlenb_of;
/**
- riscv_isa_extension_base() - Get base extension word
@@ -625,6 +627,46 @@ static void __init riscv_fill_vendor_ext_list(int cpu) } }
+static int has_thead_homogeneous_vlenb(void) +{
int cpu;u32 prev_vlenb = 0;u32 vlenb;/* Ignore thead,vlenb property if xtheavector is not enabled in the kernel */if (!IS_ENABLED(CONFIG_RISCV_ISA_XTHEADVECTOR))return 0;for_each_possible_cpu(cpu) {struct device_node *cpu_node;cpu_node = 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 != prev_vlenb) {of_node_put(cpu_node);return -ENOENT;}prev_vlenb = vlenb;of_node_put(cpu_node);}thead_vlenb_of = vlenb;return 0;+}
static int __init riscv_fill_hwcap_from_ext_list(unsigned long *isa2hwcap) { unsigned int cpu; @@ -689,6 +731,12 @@ static int __init riscv_fill_hwcap_from_ext_list(unsigned long *isa2hwcap) riscv_fill_vendor_ext_list(cpu); }
if (riscv_isa_vendor_extension_available(THEAD_VENDOR_ID, XTHEADVECTOR) &&has_thead_homogeneous_vlenb() < 0) {pr_warn("Unsupported heterogeneous vlenb detected, vector extension disabled.\n");elf_hwcap &= ~COMPAT_HWCAP_ISA_V;}
XTHEADVECTOR is 0.7.1 for old XuanTie processors; we only have homogeneous vlenb=128 chips.
So:
Acked-by: Guo Ren guoren@kernel.org
if (bitmap_empty(riscv_isa, RISCV_ISA_EXT_MAX)) return -ENOENT;diff --git a/arch/riscv/kernel/vector.c b/arch/riscv/kernel/vector.c index 6727d1d3b8f2..3ba2f2432483 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;
/* 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 = thead_vlenb_of * 32;return 0;}riscv_v_enable(); this_vsize = csr_read(CSR_VLENB) * 32; riscv_v_disable();-- 2.34.1
From: Heiko Stuebner heiko@sntech.de
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 guoren@kernel.org Reviewed-by: Conor Dooley conor.dooley@microchip.com Signed-off-by: Heiko Stuebner heiko.stuebner@vrull.eu Signed-off-by: Charlie Jenkins charlie@rivosinc.com --- arch/riscv/include/asm/csr.h | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/arch/riscv/include/asm/csr.h b/arch/riscv/include/asm/csr.h index 25966995da04..18e178d83401 100644 --- a/arch/riscv/include/asm/csr.h +++ b/arch/riscv/include/asm/csr.h @@ -216,6 +216,11 @@ #define SMSTATEEN0_SSTATEEN0_SHIFT 63 #define SMSTATEEN0_SSTATEEN0 (_ULL(1) << SMSTATEEN0_SSTATEEN0_SHIFT)
+/* VCSR flags */ +#define VCSR_VXRM_MASK 3 +#define VCSR_VXRM_SHIFT 1 +#define VCSR_VXSAT_MASK 1 + /* symbolic CSR names: */ #define CSR_CYCLE 0xc00 #define CSR_TIME 0xc01
The VXRM vector csr for xtheadvector has an encoding of 0xa and VXSAT has an encoding of 0x9.
Co-developed-by: Heiko Stuebner heiko@sntech.de Signed-off-by: Heiko Stuebner heiko@sntech.de Signed-off-by: Charlie Jenkins charlie@rivosinc.com --- arch/riscv/include/asm/csr.h | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/arch/riscv/include/asm/csr.h b/arch/riscv/include/asm/csr.h index 18e178d83401..9086639a3dde 100644 --- a/arch/riscv/include/asm/csr.h +++ b/arch/riscv/include/asm/csr.h @@ -220,6 +220,8 @@ #define VCSR_VXRM_MASK 3 #define VCSR_VXRM_SHIFT 1 #define VCSR_VXSAT_MASK 1 +#define VCSR_VXSAT 0x9 +#define VCSR_VXRM 0xa
/* symbolic CSR names: */ #define CSR_CYCLE 0xc00
Hi Charlie,
On 2024-06-19 6:57 PM, Charlie Jenkins wrote:
The VXRM vector csr for xtheadvector has an encoding of 0xa and VXSAT has an encoding of 0x9.
Co-developed-by: Heiko Stuebner heiko@sntech.de Signed-off-by: Heiko Stuebner heiko@sntech.de Signed-off-by: Charlie Jenkins charlie@rivosinc.com
arch/riscv/include/asm/csr.h | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/arch/riscv/include/asm/csr.h b/arch/riscv/include/asm/csr.h index 18e178d83401..9086639a3dde 100644 --- a/arch/riscv/include/asm/csr.h +++ b/arch/riscv/include/asm/csr.h @@ -220,6 +220,8 @@ #define VCSR_VXRM_MASK 3 #define VCSR_VXRM_SHIFT 1 #define VCSR_VXSAT_MASK 1 +#define VCSR_VXSAT 0x9 +#define VCSR_VXRM 0xa
These are normal CSR indexes, so the prefix should be just "CSR_".
Regards, Samuel
/* symbolic CSR names: */ #define CSR_CYCLE 0xc00
On Mon, Jul 01, 2024 at 10:49:23AM -0500, Samuel Holland wrote:
Hi Charlie,
On 2024-06-19 6:57 PM, Charlie Jenkins wrote:
The VXRM vector csr for xtheadvector has an encoding of 0xa and VXSAT has an encoding of 0x9.
Co-developed-by: Heiko Stuebner heiko@sntech.de Signed-off-by: Heiko Stuebner heiko@sntech.de Signed-off-by: Charlie Jenkins charlie@rivosinc.com
arch/riscv/include/asm/csr.h | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/arch/riscv/include/asm/csr.h b/arch/riscv/include/asm/csr.h index 18e178d83401..9086639a3dde 100644 --- a/arch/riscv/include/asm/csr.h +++ b/arch/riscv/include/asm/csr.h @@ -220,6 +220,8 @@ #define VCSR_VXRM_MASK 3 #define VCSR_VXRM_SHIFT 1 #define VCSR_VXSAT_MASK 1 +#define VCSR_VXSAT 0x9 +#define VCSR_VXRM 0xa
These are normal CSR indexes, so the prefix should be just "CSR_".
Ok, I can change them.
- Charlie
Regards, Samuel
/* symbolic CSR names: */ #define CSR_CYCLE 0xc00
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 heiko@sntech.de Signed-off-by: Heiko Stuebner heiko@sntech.de Signed-off-by: Charlie Jenkins charlie@rivosinc.com --- 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 @@
extern struct riscv_isa_vendor_ext_data_list riscv_isa_vendor_ext_list_thead;
+/* 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
Use alternatives to add support for xtheadvector vector save/restore routines.
Signed-off-by: Charlie Jenkins charlie@rivosinc.com Reviewed-by: Conor Dooley conor.dooley@microchip.com --- arch/riscv/include/asm/csr.h | 6 + arch/riscv/include/asm/switch_to.h | 2 +- arch/riscv/include/asm/vector.h | 249 ++++++++++++++++++++++++++------- arch/riscv/kernel/cpufeature.c | 2 +- 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 | 13 +- 8 files changed, 222 insertions(+), 68 deletions(-)
diff --git a/arch/riscv/include/asm/csr.h b/arch/riscv/include/asm/csr.h index 9086639a3dde..407d4a5687f5 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)
+#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/switch_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/vector.h index 731dcd0ed4de..6294dcaabc6a 100644 --- a/arch/riscv/include/asm/vector.h +++ b/arch/riscv/include/asm/vector.h @@ -18,6 +18,27 @@ #include <asm/cpufeature.h> #include <asm/csr.h> #include <asm/asm.h> +#include <asm/vendorid_list.h> +#include <asm/vendor_extensions.h> +#include <asm/vendor_extensions/thead.h> + +#define __riscv_v_vstate_or(_val, TYPE) ({ \ + typeof(_val) _res = _val; \ + if (has_xtheadvector()) \ + _res = (_res & ~SR_VS_THEAD) | SR_VS_##TYPE##_THEAD; \ + else \ + _res = (_res & ~SR_VS) | SR_VS_##TYPE; \ + _res; \ +}) + +#define __riscv_v_vstate_check(_val, TYPE) ({ \ + bool _res; \ + if (has_xtheadvector()) \ + _res = ((_val) & SR_VS_THEAD) == SR_VS_##TYPE##_THEAD; \ + else \ + _res = ((_val) & SR_VS) == SR_VS_##TYPE; \ + _res; \ +})
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_v); }
+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, XTHEADVECTOR); + 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 = (regs->status & ~SR_VS) | SR_VS_CLEAN; + regs->status = __riscv_v_vstate_or(regs->status, CLEAN); }
static inline void __riscv_v_vstate_dirty(struct pt_regs *regs) { - regs->status = (regs->status & ~SR_VS) | SR_VS_DIRTY; + regs->status = __riscv_v_vstate_or(regs->status, DIRTY); }
static inline void riscv_v_vstate_off(struct pt_regs *regs) { - regs->status = (regs->status & ~SR_VS) | SR_VS_OFF; + regs->status = __riscv_v_vstate_or(regs->status, OFF); }
static inline void riscv_v_vstate_on(struct pt_regs *regs) { - regs->status = (regs->status & ~SR_VS) | SR_VS_INITIAL; + regs->status = __riscv_v_vstate_or(regs->status, INITIAL); }
static inline bool riscv_v_vstate_query(struct pt_regs *regs) { - return (regs->status & SR_VS) != 0; + return !__riscv_v_vstate_check(regs->status, OFF); }
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); }
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); }
static __always_inline void __vstate_csr_save(struct __riscv_v_ext_state *dest) @@ -81,10 +125,49 @@ 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" : "=r" (dest->vstart), "=r" (dest->vtype), "=r" (dest->vl), - "=r" (dest->vcsr), "=r" (dest->vlenb) : :); + "=r" (dest->vcsr) : :); + + if (has_xtheadvector()) { + u32 tmp_vcsr; + bool restore_fpu = false; + unsigned long status = csr_read(CSR_SSTATUS); + + /* + * 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. + */ + if ((status & SR_FS) == SR_FS_OFF) { + csr_set(CSR_SSTATUS, (status & ~SR_FS) | SR_FS_CLEAN); + restore_fpu = true; + } + + asm volatile ( + "csrr %[tmp_vcsr], " __stringify(VCSR_VXRM) "\n\t" + "slliw %[vcsr], %[tmp_vcsr], " __stringify(VCSR_VXRM_SHIFT) "\n\t" + "csrr %[tmp_vcsr], " __stringify(VCSR_VXSAT) "\n\t" + "or %[vcsr], %[vcsr], %[tmp_vcsr]\n\t" + : [vcsr] "=r" (dest->vcsr), [tmp_vcsr] "=&r" (tmp_vcsr)); + + dest->vlenb = riscv_v_vsize / 32; + + if (restore_fpu) + csr_set(CSR_SSTATUS, status); + } else { + asm volatile ( + "csrr %[vcsr], " __stringify(CSR_VCSR) "\n\t" + "csrr %[vlenb], " __stringify(CSR_VLENB) "\n\t" + : [vcsr] "=r" (dest->vcsr), [vlenb] "=r" (dest->vlenb)); + } }
static __always_inline void __vstate_csr_restore(struct __riscv_v_ext_state *src) @@ -95,9 +178,37 @@ 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()) { + u32 tmp_vcsr; + bool restore_fpu = false; + unsigned long status = csr_read(CSR_SSTATUS); + + /* + * Similar to __vstate_csr_save above, restore values for the + * separate VXRM and VXSAT CSRs from the vcsr variable. + */ + if ((status & SR_FS) == SR_FS_OFF) { + csr_set(CSR_SSTATUS, (status & ~SR_FS) | SR_FS_CLEAN); + restore_fpu = true; + } + + asm volatile ( + "srliw %[tmp_vcsr], %[vcsr], " __stringify(VCSR_VXRM_SHIFT) "\n\t" + "andi %[tmp_vcsr], %[tmp_vcsr], " __stringify(VCSR_VXRM_MASK) "\n\t" + "csrw " __stringify(VCSR_VXRM) ", %[tmp_vcsr]\n\t" + "andi %[tmp_vcsr], %[vcsr], " __stringify(VCSR_VXSAT_MASK) "\n\t" + "csrw " __stringify(VCSR_VXSAT) ", %[tmp_vcsr]\n\t" + : [tmp_vcsr] "=&r" (tmp_vcsr) : [vcsr] "r" (src->vcsr)); + + if (restore_fpu) + csr_set(CSR_SSTATUS, status); + } else { + asm volatile ( + "csrw " __stringify(CSR_VCSR) ", %[vcsr]\n\t" + : : [vcsr] "r" (src->vcsr)); + } }
static inline void __riscv_v_vstate_save(struct __riscv_v_ext_state *save_to, @@ -107,19 +218,33 @@ static inline void __riscv_v_vstate_save(struct __riscv_v_ext_state *save_to,
riscv_v_enable(); __vstate_csr_save(save_to); - asm volatile ( - ".option push\n\t" - ".option arch, +v\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" - : "=&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, +v\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" + : "=&r" (vl) : "r" (datap) : "memory"); + } riscv_v_disable(); }
@@ -129,55 +254,77 @@ static inline void __riscv_v_vstate_restore(struct __riscv_v_ext_state *restore_ unsigned long vl;
riscv_v_enable(); - asm volatile ( - ".option push\n\t" - ".option arch, +v\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" - : "=&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, +v\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" + : "=&r" (vl) : "r" (datap) : "memory"); + } __vstate_csr_restore(restore_from); riscv_v_disable(); }
static inline void __riscv_v_vstate_discard(void) { - unsigned long vl, vtype_inval = 1UL << (BITS_PER_LONG - 1); + unsigned long vtype_inval = 1UL << (BITS_PER_LONG - 1);
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, +v\n\t" - "vsetvli %0, x0, e8, m8, ta, ma\n\t" "vmv.v.i v0, -1\n\t" "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" - : "=&r" (vl) : "r" (vtype_inval) : "memory"); + : : "r" (vtype_inval)); + riscv_v_disable(); }
static inline void riscv_v_vstate_discard(struct pt_regs *regs) { - if ((regs->status & SR_VS) == 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); + } }
static inline void riscv_v_vstate_save(struct __riscv_v_ext_state *vstate, struct pt_regs *regs) { - if ((regs->status & SR_VS) == 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 +333,7 @@ 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 *vstate, struct pt_regs *regs) { - if ((regs->status & SR_VS) != SR_VS_OFF) { + if (riscv_v_vstate_query(regs)) { __riscv_v_vstate_restore(vstate, vstate->datap); __riscv_v_vstate_clean(regs); } @@ -195,7 +342,7 @@ static inline void riscv_v_vstate_restore(struct __riscv_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) != 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 077be4ab1f9a..180f7eae9086 100644 --- a/arch/riscv/kernel/cpufeature.c +++ b/arch/riscv/kernel/cpufeature.c @@ -789,7 +789,7 @@ void __init riscv_fill_hwcap(void) elf_hwcap &= ~COMPAT_HWCAP_ISA_F; }
- if (elf_hwcap & COMPAT_HWCAP_ISA_V) { + if (elf_hwcap & COMPAT_HWCAP_ISA_V || has_xtheadvector_no_alternatives()) { riscv_v_setup_vsize(); /* * ISA string in device tree might have 'v' flag, but diff --git a/arch/riscv/kernel/kernel_mode_vector.c b/arch/riscv/kernel/kernel_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)
/* 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) == SR_VS_DIRTY) { + if (__riscv_v_vstate_check(task_pt_regs(current)->status, DIRTY)) { uvstate = ¤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;
depth = riscv_v_ctx_get_depth(); - if (depth == 0 && (regs->status & SR_VS) == SR_VS_DIRTY) + if (depth == 0 && __riscv_v_vstate_check(regs->status, DIRTY)) riscv_preempt_v_set_dirty();
riscv_v_ctx_depth_inc(); @@ -208,7 +208,7 @@ void kernel_vector_begin(void) { bool nested = false;
- if (WARN_ON(!has_vector())) + if (WARN_ON(!(has_vector() || has_xtheadvector()))) return;
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;
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); }
@@ -222,7 +222,7 @@ int copy_thread(struct task_struct *p, const struct kernel_clone_args *args) p->thread.s[0] = 0; } p->thread.riscv_v_flags = 0; - if (has_vector()) + if (has_vector() || has_xtheadvector()) riscv_v_thread_alloc(p); p->thread.ra = (unsigned long)ret_from_fork; p->thread.sp = (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,
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 != riscv_v_sc_size) return -EINVAL;
@@ -211,7 +211,7 @@ static size_t get_rt_frame_size(bool cal_all)
frame_size = sizeof(*frame);
- if (has_vector()) { + if (has_vector() || has_xtheadvector()) { if (cal_all || riscv_v_vstate_query(task_pt_regs(current))) total_context_size += riscv_v_sc_size; } @@ -284,7 +284,7 @@ static long setup_sigcontext(struct rt_sigframe __user *frame, if (has_fpu()) err |= 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 |= save_v_state(regs, (void __user **)&sc_ext_ptr); /* Write zero to fp-reserved space and check it on restore_sigcontext */ err |= __put_user(0, &sc->sc_extdesc.reserved); diff --git a/arch/riscv/kernel/vector.c b/arch/riscv/kernel/vector.c index 3ba2f2432483..83126995f61a 100644 --- a/arch/riscv/kernel/vector.c +++ b/arch/riscv/kernel/vector.c @@ -63,7 +63,7 @@ int riscv_v_setup_vsize(void)
void __init riscv_v_setup_ctx_cache(void) { - if (!has_vector()) + if (!(has_vector() || has_xtheadvector())) return;
riscv_v_user_cachep = kmem_cache_create_usercopy("riscv_vector_ctx", @@ -184,7 +184,8 @@ bool riscv_v_first_use_handler(struct pt_regs *regs) u32 insn = (u32)regs->badaddr;
/* Do not handle if V is not supported, or disabled */ - if (!(ELF_HWCAP & COMPAT_HWCAP_ISA_V)) + if (!(ELF_HWCAP & COMPAT_HWCAP_ISA_V) && + !(has_xtheadvector() && riscv_v_vstate_ctrl_user_allowed())) return false;
/* If V has been enabled then it is not the first-use trap */ @@ -223,7 +224,7 @@ void riscv_v_vstate_ctrl_init(struct task_struct *tsk) bool inherit; int cur, next;
- if (!has_vector()) + if (!(has_vector() || has_xtheadvector())) return;
next = riscv_v_ctrl_get_next(tsk); @@ -245,7 +246,7 @@ void riscv_v_vstate_ctrl_init(struct task_struct *tsk)
long riscv_v_vstate_ctrl_get_current(void) { - if (!has_vector()) + if (!(has_vector() || has_xtheadvector())) return -EINVAL;
return current->thread.vstate_ctrl & PR_RISCV_V_VSTATE_CTRL_MASK; @@ -256,7 +257,7 @@ long riscv_v_vstate_ctrl_set_current(unsigned long arg) bool inherit; int cur, next;
- if (!has_vector()) + if (!(has_vector() || has_xtheadvector())) return -EINVAL;
if (arg & ~PR_RISCV_V_VSTATE_CTRL_MASK) @@ -306,7 +307,7 @@ static struct ctl_table riscv_v_default_vstate_table[] = {
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; return 0;
Hi Charlie,
A couple of suggestions for simplification below.
On 2024-06-19 6:57 PM, Charlie Jenkins wrote:
Use alternatives to add support for xtheadvector vector save/restore routines.
Signed-off-by: Charlie Jenkins charlie@rivosinc.com Reviewed-by: Conor Dooley conor.dooley@microchip.com
arch/riscv/include/asm/csr.h | 6 + arch/riscv/include/asm/switch_to.h | 2 +- arch/riscv/include/asm/vector.h | 249 ++++++++++++++++++++++++++------- arch/riscv/kernel/cpufeature.c | 2 +- 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 | 13 +- 8 files changed, 222 insertions(+), 68 deletions(-)
diff --git a/arch/riscv/include/asm/csr.h b/arch/riscv/include/asm/csr.h index 9086639a3dde..407d4a5687f5 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) +#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/switch_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/vector.h index 731dcd0ed4de..6294dcaabc6a 100644 --- a/arch/riscv/include/asm/vector.h +++ b/arch/riscv/include/asm/vector.h @@ -18,6 +18,27 @@ #include <asm/cpufeature.h> #include <asm/csr.h> #include <asm/asm.h> +#include <asm/vendorid_list.h> +#include <asm/vendor_extensions.h> +#include <asm/vendor_extensions/thead.h>
+#define __riscv_v_vstate_or(_val, TYPE) ({ \
- typeof(_val) _res = _val; \
- if (has_xtheadvector()) \
_res = (_res & ~SR_VS_THEAD) | SR_VS_##TYPE##_THEAD; \- else \
_res = (_res & ~SR_VS) | SR_VS_##TYPE; \- _res; \
+})
+#define __riscv_v_vstate_check(_val, TYPE) ({ \
- bool _res; \
- if (has_xtheadvector()) \
_res = ((_val) & SR_VS_THEAD) == SR_VS_##TYPE##_THEAD; \- else \
_res = ((_val) & SR_VS) == SR_VS_##TYPE; \- _res; \
+}) 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_v); } +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, XTHEADVECTOR);- 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 = (regs->status & ~SR_VS) | SR_VS_CLEAN;
- regs->status = __riscv_v_vstate_or(regs->status, CLEAN);
} static inline void __riscv_v_vstate_dirty(struct pt_regs *regs) {
- regs->status = (regs->status & ~SR_VS) | SR_VS_DIRTY;
- regs->status = __riscv_v_vstate_or(regs->status, DIRTY);
} static inline void riscv_v_vstate_off(struct pt_regs *regs) {
- regs->status = (regs->status & ~SR_VS) | SR_VS_OFF;
- regs->status = __riscv_v_vstate_or(regs->status, OFF);
} static inline void riscv_v_vstate_on(struct pt_regs *regs) {
- regs->status = (regs->status & ~SR_VS) | SR_VS_INITIAL;
- regs->status = __riscv_v_vstate_or(regs->status, INITIAL);
} static inline bool riscv_v_vstate_query(struct pt_regs *regs) {
- return (regs->status & SR_VS) != 0;
- return !__riscv_v_vstate_check(regs->status, OFF);
} 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);} 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);} static __always_inline void __vstate_csr_save(struct __riscv_v_ext_state *dest) @@ -81,10 +125,49 @@ 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""=r" (dest->vcsr), "=r" (dest->vlenb) : :);
"=r" (dest->vcsr) : :);- if (has_xtheadvector()) {
u32 tmp_vcsr;bool restore_fpu = false;unsigned long status = csr_read(CSR_SSTATUS);/** 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.*/if ((status & SR_FS) == SR_FS_OFF) {csr_set(CSR_SSTATUS, (status & ~SR_FS) | SR_FS_CLEAN);restore_fpu = true;}
This simplifies to:
unsigned long status = csr_read_set(CSR_STATUS, SR_FS_DIRTY);
and then below:
if ((status & SR_FS) != SR_FS_DIRTY) csr_write(CSR_STATUS, status);
asm volatile ("csrr %[tmp_vcsr], " __stringify(VCSR_VXRM) "\n\t""slliw %[vcsr], %[tmp_vcsr], " __stringify(VCSR_VXRM_SHIFT) "\n\t""csrr %[tmp_vcsr], " __stringify(VCSR_VXSAT) "\n\t""or %[vcsr], %[vcsr], %[tmp_vcsr]\n\t": [vcsr] "=r" (dest->vcsr), [tmp_vcsr] "=&r" (tmp_vcsr));
None of this needs to be inline assembly. I think the only reason that __vstate_csr_save() uses inline assembly is to match __vstate_csr_restore(), which needs it to execute a vsetvl instruction. This would be easier to parse if it used csr_read().
dest->vlenb = riscv_v_vsize / 32;
This value can't change at runtime (for either standard V or Xtheadvector), so we don't need to save it every time. So (possibly as a future optimization) this could be saved only once when the context is first initialized.
if (restore_fpu)csr_set(CSR_SSTATUS, status);- } else {
asm volatile ("csrr %[vcsr], " __stringify(CSR_VCSR) "\n\t""csrr %[vlenb], " __stringify(CSR_VLENB) "\n\t": [vcsr] "=r" (dest->vcsr), [vlenb] "=r" (dest->vlenb));- }
} static __always_inline void __vstate_csr_restore(struct __riscv_v_ext_state *src) @@ -95,9 +178,37 @@ 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()) {
u32 tmp_vcsr;bool restore_fpu = false;unsigned long status = csr_read(CSR_SSTATUS);/** Similar to __vstate_csr_save above, restore values for the* separate VXRM and VXSAT CSRs from the vcsr variable.*/if ((status & SR_FS) == SR_FS_OFF) {csr_set(CSR_SSTATUS, (status & ~SR_FS) | SR_FS_CLEAN);restore_fpu = true;}asm volatile ("srliw %[tmp_vcsr], %[vcsr], " __stringify(VCSR_VXRM_SHIFT) "\n\t""andi %[tmp_vcsr], %[tmp_vcsr], " __stringify(VCSR_VXRM_MASK) "\n\t""csrw " __stringify(VCSR_VXRM) ", %[tmp_vcsr]\n\t""andi %[tmp_vcsr], %[vcsr], " __stringify(VCSR_VXSAT_MASK) "\n\t""csrw " __stringify(VCSR_VXSAT) ", %[tmp_vcsr]\n\t": [tmp_vcsr] "=&r" (tmp_vcsr) : [vcsr] "r" (src->vcsr));
Similarly, this would be a lot easier to parse with csr_write() instead of inline assembly.
Regards, Samuel
if (restore_fpu)csr_set(CSR_SSTATUS, status);- } else {
asm volatile ("csrw " __stringify(CSR_VCSR) ", %[vcsr]\n\t": : [vcsr] "r" (src->vcsr));- }
} static inline void __riscv_v_vstate_save(struct __riscv_v_ext_state *save_to, @@ -107,19 +218,33 @@ static inline void __riscv_v_vstate_save(struct __riscv_v_ext_state *save_to, riscv_v_enable(); __vstate_csr_save(save_to);
- asm volatile (
".option push\n\t"".option arch, +v\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": "=&r" (vl) : "r" (datap) : "memory");
- if (has_xtheadvector()) {
asm volatile ("mv t0, %0\n\t"THEAD_VSETVLI_T4X0E8M8D1THEAD_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, +v\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": "=&r" (vl) : "r" (datap) : "memory");- } riscv_v_disable();
} @@ -129,55 +254,77 @@ static inline void __riscv_v_vstate_restore(struct __riscv_v_ext_state *restore_ unsigned long vl; riscv_v_enable();
- asm volatile (
".option push\n\t"".option arch, +v\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": "=&r" (vl) : "r" (datap) : "memory");
- if (has_xtheadvector()) {
asm volatile ("mv t0, %0\n\t"THEAD_VSETVLI_T4X0E8M8D1THEAD_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, +v\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": "=&r" (vl) : "r" (datap) : "memory");- } __vstate_csr_restore(restore_from); riscv_v_disable();
} static inline void __riscv_v_vstate_discard(void) {
- unsigned long vl, vtype_inval = 1UL << (BITS_PER_LONG - 1);
- unsigned long vtype_inval = 1UL << (BITS_PER_LONG - 1);
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, +v\n\t"
"vsetvli %0, x0, e8, m8, ta, ma\n\t""vsetvl %0, x0, %1\n\t"
"vsetvl x0, x0, %0\n\t"
: "=&r" (vl) : "r" (vtype_inval) : "memory");
: : "r" (vtype_inval));- riscv_v_disable();
} static inline void riscv_v_vstate_discard(struct pt_regs *regs) {
- if ((regs->status & SR_VS) == 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);- }
} static inline void riscv_v_vstate_save(struct __riscv_v_ext_state *vstate, struct pt_regs *regs) {
- if ((regs->status & SR_VS) == 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 +333,7 @@ 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 *vstate, struct pt_regs *regs) {
- if ((regs->status & SR_VS) != SR_VS_OFF) {
- if (riscv_v_vstate_query(regs)) { __riscv_v_vstate_restore(vstate, vstate->datap); __riscv_v_vstate_clean(regs); }
@@ -195,7 +342,7 @@ static inline void riscv_v_vstate_restore(struct __riscv_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) != 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 077be4ab1f9a..180f7eae9086 100644 --- a/arch/riscv/kernel/cpufeature.c +++ b/arch/riscv/kernel/cpufeature.c @@ -789,7 +789,7 @@ void __init riscv_fill_hwcap(void) elf_hwcap &= ~COMPAT_HWCAP_ISA_F; }
- if (elf_hwcap & COMPAT_HWCAP_ISA_V) {
- if (elf_hwcap & COMPAT_HWCAP_ISA_V || has_xtheadvector_no_alternatives()) { riscv_v_setup_vsize(); /*
- ISA string in device tree might have 'v' flag, but
diff --git a/arch/riscv/kernel/kernel_mode_vector.c b/arch/riscv/kernel/kernel_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) /* 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) == SR_VS_DIRTY) {
- if (__riscv_v_vstate_check(task_pt_regs(current)->status, DIRTY)) { uvstate = ¤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; depth = riscv_v_ctx_get_depth();
- if (depth == 0 && (regs->status & SR_VS) == SR_VS_DIRTY)
- if (depth == 0 && __riscv_v_vstate_check(regs->status, DIRTY)) riscv_preempt_v_set_dirty();
riscv_v_ctx_depth_inc(); @@ -208,7 +208,7 @@ void kernel_vector_begin(void) { bool nested = false;
- if (WARN_ON(!has_vector()))
- if (WARN_ON(!(has_vector() || has_xtheadvector()))) return;
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;
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);
} @@ -222,7 +222,7 @@ int copy_thread(struct task_struct *p, const struct kernel_clone_args *args) p->thread.s[0] = 0; } p->thread.riscv_v_flags = 0;
- if (has_vector())
- if (has_vector() || has_xtheadvector()) riscv_v_thread_alloc(p); p->thread.ra = (unsigned long)ret_from_fork; p->thread.sp = (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, 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 != riscv_v_sc_size) return -EINVAL;@@ -211,7 +211,7 @@ static size_t get_rt_frame_size(bool cal_all) frame_size = sizeof(*frame);
- if (has_vector()) {
- if (has_vector() || has_xtheadvector()) { if (cal_all || riscv_v_vstate_query(task_pt_regs(current))) total_context_size += riscv_v_sc_size; }
@@ -284,7 +284,7 @@ static long setup_sigcontext(struct rt_sigframe __user *frame, if (has_fpu()) err |= 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 |= save_v_state(regs, (void __user **)&sc_ext_ptr); /* Write zero to fp-reserved space and check it on restore_sigcontext */ err |= __put_user(0, &sc->sc_extdesc.reserved);
diff --git a/arch/riscv/kernel/vector.c b/arch/riscv/kernel/vector.c index 3ba2f2432483..83126995f61a 100644 --- a/arch/riscv/kernel/vector.c +++ b/arch/riscv/kernel/vector.c @@ -63,7 +63,7 @@ int riscv_v_setup_vsize(void) void __init riscv_v_setup_ctx_cache(void) {
- if (!has_vector())
- if (!(has_vector() || has_xtheadvector())) return;
riscv_v_user_cachep = kmem_cache_create_usercopy("riscv_vector_ctx", @@ -184,7 +184,8 @@ bool riscv_v_first_use_handler(struct pt_regs *regs) u32 insn = (u32)regs->badaddr; /* Do not handle if V is not supported, or disabled */
- if (!(ELF_HWCAP & COMPAT_HWCAP_ISA_V))
- if (!(ELF_HWCAP & COMPAT_HWCAP_ISA_V) &&
!(has_xtheadvector() && riscv_v_vstate_ctrl_user_allowed()))/* If V has been enabled then it is not the first-use trap */ @@ -223,7 +224,7 @@ void riscv_v_vstate_ctrl_init(struct task_struct *tsk) bool inherit; int cur, next;
- if (!has_vector())
- if (!(has_vector() || has_xtheadvector())) return;
next = riscv_v_ctrl_get_next(tsk); @@ -245,7 +246,7 @@ void riscv_v_vstate_ctrl_init(struct task_struct *tsk) long riscv_v_vstate_ctrl_get_current(void) {
- if (!has_vector())
- if (!(has_vector() || has_xtheadvector())) return -EINVAL;
return current->thread.vstate_ctrl & PR_RISCV_V_VSTATE_CTRL_MASK; @@ -256,7 +257,7 @@ long riscv_v_vstate_ctrl_set_current(unsigned long arg) bool inherit; int cur, next;
- if (!has_vector())
- if (!(has_vector() || has_xtheadvector())) return -EINVAL;
if (arg & ~PR_RISCV_V_VSTATE_CTRL_MASK) @@ -306,7 +307,7 @@ static struct ctl_table riscv_v_default_vstate_table[] = { 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; return 0;
On Mon, Jul 01, 2024 at 11:20:24AM -0500, Samuel Holland wrote:
Hi Charlie,
A couple of suggestions for simplification below.
On 2024-06-19 6:57 PM, Charlie Jenkins wrote:
Use alternatives to add support for xtheadvector vector save/restore routines.
Signed-off-by: Charlie Jenkins charlie@rivosinc.com Reviewed-by: Conor Dooley conor.dooley@microchip.com
arch/riscv/include/asm/csr.h | 6 + arch/riscv/include/asm/switch_to.h | 2 +- arch/riscv/include/asm/vector.h | 249 ++++++++++++++++++++++++++------- arch/riscv/kernel/cpufeature.c | 2 +- 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 | 13 +- 8 files changed, 222 insertions(+), 68 deletions(-)
diff --git a/arch/riscv/include/asm/csr.h b/arch/riscv/include/asm/csr.h index 9086639a3dde..407d4a5687f5 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) +#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/switch_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/vector.h index 731dcd0ed4de..6294dcaabc6a 100644 --- a/arch/riscv/include/asm/vector.h +++ b/arch/riscv/include/asm/vector.h @@ -18,6 +18,27 @@ #include <asm/cpufeature.h> #include <asm/csr.h> #include <asm/asm.h> +#include <asm/vendorid_list.h> +#include <asm/vendor_extensions.h> +#include <asm/vendor_extensions/thead.h>
+#define __riscv_v_vstate_or(_val, TYPE) ({ \
- typeof(_val) _res = _val; \
- if (has_xtheadvector()) \
_res = (_res & ~SR_VS_THEAD) | SR_VS_##TYPE##_THEAD; \- else \
_res = (_res & ~SR_VS) | SR_VS_##TYPE; \- _res; \
+})
+#define __riscv_v_vstate_check(_val, TYPE) ({ \
- bool _res; \
- if (has_xtheadvector()) \
_res = ((_val) & SR_VS_THEAD) == SR_VS_##TYPE##_THEAD; \- else \
_res = ((_val) & SR_VS) == SR_VS_##TYPE; \- _res; \
+}) 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_v); } +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, XTHEADVECTOR);- 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 = (regs->status & ~SR_VS) | SR_VS_CLEAN;
- regs->status = __riscv_v_vstate_or(regs->status, CLEAN);
} static inline void __riscv_v_vstate_dirty(struct pt_regs *regs) {
- regs->status = (regs->status & ~SR_VS) | SR_VS_DIRTY;
- regs->status = __riscv_v_vstate_or(regs->status, DIRTY);
} static inline void riscv_v_vstate_off(struct pt_regs *regs) {
- regs->status = (regs->status & ~SR_VS) | SR_VS_OFF;
- regs->status = __riscv_v_vstate_or(regs->status, OFF);
} static inline void riscv_v_vstate_on(struct pt_regs *regs) {
- regs->status = (regs->status & ~SR_VS) | SR_VS_INITIAL;
- regs->status = __riscv_v_vstate_or(regs->status, INITIAL);
} static inline bool riscv_v_vstate_query(struct pt_regs *regs) {
- return (regs->status & SR_VS) != 0;
- return !__riscv_v_vstate_check(regs->status, OFF);
} 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);} 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);} static __always_inline void __vstate_csr_save(struct __riscv_v_ext_state *dest) @@ -81,10 +125,49 @@ 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""=r" (dest->vcsr), "=r" (dest->vlenb) : :);
"=r" (dest->vcsr) : :);- if (has_xtheadvector()) {
u32 tmp_vcsr;bool restore_fpu = false;unsigned long status = csr_read(CSR_SSTATUS);/** 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.*/if ((status & SR_FS) == SR_FS_OFF) {csr_set(CSR_SSTATUS, (status & ~SR_FS) | SR_FS_CLEAN);restore_fpu = true;}This simplifies to:
unsigned long status = csr_read_set(CSR_STATUS, SR_FS_DIRTY);
and then below:
if ((status & SR_FS) != SR_FS_DIRTY) csr_write(CSR_STATUS, status);
Great suggestions, thank you!
asm volatile ("csrr %[tmp_vcsr], " __stringify(VCSR_VXRM) "\n\t""slliw %[vcsr], %[tmp_vcsr], " __stringify(VCSR_VXRM_SHIFT) "\n\t""csrr %[tmp_vcsr], " __stringify(VCSR_VXSAT) "\n\t""or %[vcsr], %[vcsr], %[tmp_vcsr]\n\t": [vcsr] "=r" (dest->vcsr), [tmp_vcsr] "=&r" (tmp_vcsr));None of this needs to be inline assembly. I think the only reason that __vstate_csr_save() uses inline assembly is to match __vstate_csr_restore(), which needs it to execute a vsetvl instruction. This would be easier to parse if it used csr_read().
You are totally right! Converting this to C will make the code much easier to follow.
dest->vlenb = riscv_v_vsize / 32;This value can't change at runtime (for either standard V or Xtheadvector), so we don't need to save it every time. So (possibly as a future optimization) this could be saved only once when the context is first initialized.
Yes that is something that should be optimized. I can optimize this in a follow up patch so this series doesn't grow any more.
if (restore_fpu)csr_set(CSR_SSTATUS, status);- } else {
asm volatile ("csrr %[vcsr], " __stringify(CSR_VCSR) "\n\t""csrr %[vlenb], " __stringify(CSR_VLENB) "\n\t": [vcsr] "=r" (dest->vcsr), [vlenb] "=r" (dest->vlenb));- }
} static __always_inline void __vstate_csr_restore(struct __riscv_v_ext_state *src) @@ -95,9 +178,37 @@ 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()) {
u32 tmp_vcsr;bool restore_fpu = false;unsigned long status = csr_read(CSR_SSTATUS);/** Similar to __vstate_csr_save above, restore values for the* separate VXRM and VXSAT CSRs from the vcsr variable.*/if ((status & SR_FS) == SR_FS_OFF) {csr_set(CSR_SSTATUS, (status & ~SR_FS) | SR_FS_CLEAN);restore_fpu = true;}asm volatile ("srliw %[tmp_vcsr], %[vcsr], " __stringify(VCSR_VXRM_SHIFT) "\n\t""andi %[tmp_vcsr], %[tmp_vcsr], " __stringify(VCSR_VXRM_MASK) "\n\t""csrw " __stringify(VCSR_VXRM) ", %[tmp_vcsr]\n\t""andi %[tmp_vcsr], %[vcsr], " __stringify(VCSR_VXSAT_MASK) "\n\t""csrw " __stringify(VCSR_VXSAT) ", %[tmp_vcsr]\n\t": [tmp_vcsr] "=&r" (tmp_vcsr) : [vcsr] "r" (src->vcsr));Similarly, this would be a lot easier to parse with csr_write() instead of inline assembly.
Will do, thank you!
- Charlie
Regards, Samuel
if (restore_fpu)csr_set(CSR_SSTATUS, status);- } else {
asm volatile ("csrw " __stringify(CSR_VCSR) ", %[vcsr]\n\t": : [vcsr] "r" (src->vcsr));- }
} static inline void __riscv_v_vstate_save(struct __riscv_v_ext_state *save_to, @@ -107,19 +218,33 @@ static inline void __riscv_v_vstate_save(struct __riscv_v_ext_state *save_to, riscv_v_enable(); __vstate_csr_save(save_to);
- asm volatile (
".option push\n\t"".option arch, +v\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": "=&r" (vl) : "r" (datap) : "memory");
- if (has_xtheadvector()) {
asm volatile ("mv t0, %0\n\t"THEAD_VSETVLI_T4X0E8M8D1THEAD_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, +v\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": "=&r" (vl) : "r" (datap) : "memory");- } riscv_v_disable();
} @@ -129,55 +254,77 @@ static inline void __riscv_v_vstate_restore(struct __riscv_v_ext_state *restore_ unsigned long vl; riscv_v_enable();
- asm volatile (
".option push\n\t"".option arch, +v\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": "=&r" (vl) : "r" (datap) : "memory");
- if (has_xtheadvector()) {
asm volatile ("mv t0, %0\n\t"THEAD_VSETVLI_T4X0E8M8D1THEAD_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, +v\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": "=&r" (vl) : "r" (datap) : "memory");- } __vstate_csr_restore(restore_from); riscv_v_disable();
} static inline void __riscv_v_vstate_discard(void) {
- unsigned long vl, vtype_inval = 1UL << (BITS_PER_LONG - 1);
- unsigned long vtype_inval = 1UL << (BITS_PER_LONG - 1);
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, +v\n\t"
"vsetvli %0, x0, e8, m8, ta, ma\n\t""vsetvl %0, x0, %1\n\t"
"vsetvl x0, x0, %0\n\t"
: "=&r" (vl) : "r" (vtype_inval) : "memory");
: : "r" (vtype_inval));- riscv_v_disable();
} static inline void riscv_v_vstate_discard(struct pt_regs *regs) {
- if ((regs->status & SR_VS) == 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);- }
} static inline void riscv_v_vstate_save(struct __riscv_v_ext_state *vstate, struct pt_regs *regs) {
- if ((regs->status & SR_VS) == 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 +333,7 @@ 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 *vstate, struct pt_regs *regs) {
- if ((regs->status & SR_VS) != SR_VS_OFF) {
- if (riscv_v_vstate_query(regs)) { __riscv_v_vstate_restore(vstate, vstate->datap); __riscv_v_vstate_clean(regs); }
@@ -195,7 +342,7 @@ static inline void riscv_v_vstate_restore(struct __riscv_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) != 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 077be4ab1f9a..180f7eae9086 100644 --- a/arch/riscv/kernel/cpufeature.c +++ b/arch/riscv/kernel/cpufeature.c @@ -789,7 +789,7 @@ void __init riscv_fill_hwcap(void) elf_hwcap &= ~COMPAT_HWCAP_ISA_F; }
- if (elf_hwcap & COMPAT_HWCAP_ISA_V) {
- if (elf_hwcap & COMPAT_HWCAP_ISA_V || has_xtheadvector_no_alternatives()) { riscv_v_setup_vsize(); /*
- ISA string in device tree might have 'v' flag, but
diff --git a/arch/riscv/kernel/kernel_mode_vector.c b/arch/riscv/kernel/kernel_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) /* 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) == SR_VS_DIRTY) {
- if (__riscv_v_vstate_check(task_pt_regs(current)->status, DIRTY)) { uvstate = ¤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; depth = riscv_v_ctx_get_depth();
- if (depth == 0 && (regs->status & SR_VS) == SR_VS_DIRTY)
- if (depth == 0 && __riscv_v_vstate_check(regs->status, DIRTY)) riscv_preempt_v_set_dirty();
riscv_v_ctx_depth_inc(); @@ -208,7 +208,7 @@ void kernel_vector_begin(void) { bool nested = false;
- if (WARN_ON(!has_vector()))
- if (WARN_ON(!(has_vector() || has_xtheadvector()))) return;
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;
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);
} @@ -222,7 +222,7 @@ int copy_thread(struct task_struct *p, const struct kernel_clone_args *args) p->thread.s[0] = 0; } p->thread.riscv_v_flags = 0;
- if (has_vector())
- if (has_vector() || has_xtheadvector()) riscv_v_thread_alloc(p); p->thread.ra = (unsigned long)ret_from_fork; p->thread.sp = (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, 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 != riscv_v_sc_size) return -EINVAL;@@ -211,7 +211,7 @@ static size_t get_rt_frame_size(bool cal_all) frame_size = sizeof(*frame);
- if (has_vector()) {
- if (has_vector() || has_xtheadvector()) { if (cal_all || riscv_v_vstate_query(task_pt_regs(current))) total_context_size += riscv_v_sc_size; }
@@ -284,7 +284,7 @@ static long setup_sigcontext(struct rt_sigframe __user *frame, if (has_fpu()) err |= 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 |= save_v_state(regs, (void __user **)&sc_ext_ptr); /* Write zero to fp-reserved space and check it on restore_sigcontext */ err |= __put_user(0, &sc->sc_extdesc.reserved);
diff --git a/arch/riscv/kernel/vector.c b/arch/riscv/kernel/vector.c index 3ba2f2432483..83126995f61a 100644 --- a/arch/riscv/kernel/vector.c +++ b/arch/riscv/kernel/vector.c @@ -63,7 +63,7 @@ int riscv_v_setup_vsize(void) void __init riscv_v_setup_ctx_cache(void) {
- if (!has_vector())
- if (!(has_vector() || has_xtheadvector())) return;
riscv_v_user_cachep = kmem_cache_create_usercopy("riscv_vector_ctx", @@ -184,7 +184,8 @@ bool riscv_v_first_use_handler(struct pt_regs *regs) u32 insn = (u32)regs->badaddr; /* Do not handle if V is not supported, or disabled */
- if (!(ELF_HWCAP & COMPAT_HWCAP_ISA_V))
- if (!(ELF_HWCAP & COMPAT_HWCAP_ISA_V) &&
!(has_xtheadvector() && riscv_v_vstate_ctrl_user_allowed()))/* If V has been enabled then it is not the first-use trap */ @@ -223,7 +224,7 @@ void riscv_v_vstate_ctrl_init(struct task_struct *tsk) bool inherit; int cur, next;
- if (!has_vector())
- if (!(has_vector() || has_xtheadvector())) return;
next = riscv_v_ctrl_get_next(tsk); @@ -245,7 +246,7 @@ void riscv_v_vstate_ctrl_init(struct task_struct *tsk) long riscv_v_vstate_ctrl_get_current(void) {
- if (!has_vector())
- if (!(has_vector() || has_xtheadvector())) return -EINVAL;
return current->thread.vstate_ctrl & PR_RISCV_V_VSTATE_CTRL_MASK; @@ -256,7 +257,7 @@ long riscv_v_vstate_ctrl_set_current(unsigned long arg) bool inherit; int cur, next;
- if (!has_vector())
- if (!(has_vector() || has_xtheadvector())) return -EINVAL;
if (arg & ~PR_RISCV_V_VSTATE_CTRL_MASK) @@ -306,7 +307,7 @@ static struct ctl_table riscv_v_default_vstate_table[] = { 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; return 0;
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 charlie@rivosinc.com Reviewed-by: Evan Green evan@rivosinc.com --- 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/hwprobe.h index 630507dff5ea..de9fe279f02e 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 */
#ifndef _ASM_HWPROBE_H @@ -8,7 +8,7 @@
#include <uapi/asm/hwprobe.h>
-#define RISCV_HWPROBE_MAX_KEY 6 +#define RISCV_HWPROBE_MAX_KEY 7
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; }
diff --git a/arch/riscv/include/asm/vendor_extensions/thead_hwprobe.h b/arch/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 <linux/cpumask.h> + +#include <uapi/asm/hwprobe.h> + +#ifdef CONFIG_RISCV_ISA_VENDOR_EXT_THEAD +void hwprobe_isa_vendor_ext_thead_0(struct riscv_hwprobe *pair, const struct cpumask *cpus); +#else +static inline void hwprobe_isa_vendor_ext_thead_0(struct riscv_hwprobe *pair, const struct cpumask *cpus) +{ + pair->value = 0; +} +#endif + +#endif diff --git a/arch/riscv/include/asm/vendor_extensions/vendor_hwprobe.h b/arch/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 <asm/cpufeature.h> + +#define VENDOR_EXT_KEY(ext) \ + do { \ + if (__riscv_isa_extension_available(isainfo->isa, RISCV_ISA_VENDOR_EXT_##ext)) \ + pair->value |= RISCV_HWPROBE_VENDOR_EXT_##ext; \ + else \ + missing |= 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->value + * and missing. It should be filled with VENDOR_EXT_KEY expressions. + */ +#define VENDOR_EXTENSION_SUPPORTED(pair, cpus, per_hart_vendor_bitmap, _extension_checks) \ + do { \ + int cpu; \ + u64 missing; \ + for_each_cpu(cpu, (cpus)) { \ + struct riscv_isavendorinfo *isainfo = &(per_hart_vendor_bitmap)[cpu]; \ + _extension_checks \ + } \ + (pair)->value &= ~missing; \ + } while (false) \ + +#endif /* _ASM_RISCV_SYS_HWPROBE_H */ diff --git a/arch/riscv/include/uapi/asm/hwprobe.h b/arch/riscv/include/uapi/asm/hwprobe.h index dda76a05420b..155a83dd1cdf 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 */
#ifndef _UAPI_ASM_HWPROBE_H @@ -68,6 +68,7 @@ struct riscv_hwprobe { #define RISCV_HWPROBE_MISALIGNED_UNSUPPORTED (4 << 0) #define RISCV_HWPROBE_MISALIGNED_MASK (7 << 0) #define RISCV_HWPROBE_KEY_ZICBOZ_BLOCK_SIZE 6 +#define RISCV_HWPROBE_KEY_VENDOR_EXT_THEAD_0 7 /* Increase RISCV_HWPROBE_MAX_KEY when adding items. */
/* Flags */ diff --git a/arch/riscv/include/uapi/asm/vendor/thead.h b/arch/riscv/include/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_hwprobe.c index 969ef3d59dbe..e39fa70083d3 100644 --- a/arch/riscv/kernel/sys_hwprobe.c +++ b/arch/riscv/kernel/sys_hwprobe.c @@ -13,6 +13,7 @@ #include <asm/uaccess.h> #include <asm/unistd.h> #include <asm/vector.h> +#include <asm/vendor_extensions/thead_hwprobe.h> #include <vdso/vsyscall.h>
@@ -217,6 +218,10 @@ static void hwprobe_one_pair(struct riscv_hwprobe *pair, pair->value = riscv_cboz_block_size; break;
+ 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/kernel/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 @@
obj-$(CONFIG_RISCV_ISA_VENDOR_EXT_ANDES) += andes.o obj-$(CONFIG_RISCV_ISA_VENDOR_EXT_THEAD) += thead.o +obj-$(CONFIG_RISCV_ISA_VENDOR_EXT_THEAD) += thead_hwprobe.o diff --git a/arch/riscv/kernel/vendor_extensions/thead_hwprobe.c b/arch/riscv/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 <asm/vendor_extensions/thead.h> +#include <asm/vendor_extensions/thead_hwprobe.h> +#include <asm/vendor_extensions/vendor_hwprobe.h> + +#include <linux/cpumask.h> +#include <linux/types.h> + +#include <uapi/asm/hwprobe.h> +#include <uapi/asm/vendor/thead.h> + +void hwprobe_isa_vendor_ext_thead_0(struct riscv_hwprobe *pair, const struct cpumask *cpus) +{ + VENDOR_EXTENSION_SUPPORTED(pair, cpus, + riscv_isa_vendor_ext_list_thead.per_hart_isa_bitmap, { + VENDOR_EXT_KEY(XTHEADVECTOR); + }); +}
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 charlie@rivosinc.com Reviewed-by: Evan Green evan@rivosinc.com --- Documentation/arch/riscv/hwprobe.rst | 10 ++++++++++ 1 file changed, 10 insertions(+)
diff --git a/Documentation/arch/riscv/hwprobe.rst b/Documentation/arch/riscv/hwprobe.rst index 204cd4433af5..9c0ef8c57228 100644 --- a/Documentation/arch/riscv/hwprobe.rst +++ b/Documentation/arch/riscv/hwprobe.rst @@ -214,3 +214,13 @@ The following keys are defined:
* :c:macro:`RISCV_HWPROBE_KEY_ZICBOZ_BLOCK_SIZE`: An unsigned int which represents the size of the Zicboz block in bytes. + +* :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 vendor + extension is supported in the T-Head ISA extensions spec starting from + commit a18c801634 ("Add T-Head VECTOR vendor extension. ").
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 charlie@rivosinc.com --- 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 ++++++++++++--------- 8 files changed, 324 insertions(+), 191 deletions(-)
diff --git a/tools/testing/selftests/riscv/vector/.gitignore b/tools/testing/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
-TEST_GEN_PROGS := vstate_prctl v_initval_nolibc -TEST_GEN_PROGS_EXTENDED := vstate_exec_nolibc +TEST_GEN_PROGS := v_initval vstate_prctl +TEST_GEN_PROGS_EXTENDED := vstate_exec_nolibc v_exec_initval_nolibc sys_hwprobe.o v_helpers.o
include ../../lib.mk
-$(OUTPUT)/vstate_prctl: vstate_prctl.c ../hwprobe/sys_hwprobe.S +$(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) $^
$(OUTPUT)/vstate_exec_nolibc: vstate_exec_nolibc.c $(CC) -nostdlib -static -include ../../../../include/nolibc/nolibc.h \ -Wall $(CFLAGS) $(LDFLAGS) $^ -o $@ -lgcc
-$(OUTPUT)/v_initval_nolibc: v_initval_nolibc.c +$(OUTPUT)/v_initval: v_initval.c $(OUTPUT)/sys_hwprobe.o $(OUTPUT)/v_helpers.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 reading + * 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 = 0, value; + unsigned long vl; + int first = 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] "=r" (vl) + ); + +#define CHECK_VECTOR_REGISTER(register) ({ \ + for (int i = 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" \ + : "=r" (value)); \ + if (first) { \ + first = 0; \ + } else if (value != prev_value || !(value == 0x00 || value == 0xff)) { \ + printf("Register " __stringify(register) " values not clean! value: %u\n", value); \ + exit(-1); \ + } \ + prev_value = 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/testing/selftests/riscv/vector/v_helpers.c new file mode 100644 index 000000000000..15c22318db72 --- /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 <stdlib.h> +#include <stdio.h> +#include <unistd.h> +#include <sys/wait.h> + +int is_vector_supported(void) +{ + struct riscv_hwprobe pair; + + pair.key = RISCV_HWPROBE_KEY_IMA_EXT_0; + riscv_hwprobe(&pair, 1, 0, NULL, 0); + return pair.value & RISCV_HWPROBE_IMA_V; +} + +int launch_test(char *next_program, int test_inherit) +{ + char *exec_argv[3], *exec_envp[1]; + int rc, pid, status; + + pid = fork(); + if (pid < 0) { + printf("fork failed %d", pid); + return -1; + } + + if (!pid) { + exec_argv[0] = next_program; + exec_argv[1] = test_inherit != 0 ? "x" : NULL; + exec_argv[2] = NULL; + exec_envp[0] = NULL; + /* launch the program again to check inherit */ + rc = execve(next_program, exec_argv, exec_envp); + if (rc) { + perror("execve"); + printf("child execve failed %d\n", rc); + exit(-1); + } + } + + rc = waitpid(-1, &status, 0); + if (rc < 0) { + printf("waitpid failed\n"); + return -3; + } + + if ((WIFEXITED(status) && WEXITSTATUS(status) == -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/testing/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/testing/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/tools/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 = 0; - - for (i = 0; i < size; i++) { - if (i != 0) { - if (i % 16 == 0) - printf("\n"); - else if (i % 8 == 0) - printf(" "); - } - printf("%02x ", ptr[i]); - } - printf("\n"); -} - -int main(void) -{ - int i; - unsigned long vl; - char *datap, *tmp; - - datap = malloc(MAX_VSIZE); - if (!datap) { - ksft_test_result_fail("fail to allocate memory for size = %d\n", MAX_VSIZE); - exit(-1); - } - - tmp = 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" - : "=&r" (vl), "=r" (tmp) : "r" (datap) : "memory"); - - ksft_print_msg("vl = %lu\n", vl); - - if (datap[0] != 0x00 && datap[0] != 0xff) { - ksft_test_result_fail("v-regesters are not properly initialized\n"); - dump(datap, vl * 4); - exit(-1); - } - - for (i = 1; i < vl * 4; i++) { - if (datap[i] != 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/testing/selftests/riscv/vector/vstate_prctl.c index 27668fb3b6d0..528e8c544db0 100644 --- a/tools/testing/selftests/riscv/vector/vstate_prctl.c +++ b/tools/testing/selftests/riscv/vector/vstate_prctl.c @@ -3,50 +3,13 @@ #include <unistd.h> #include <errno.h> #include <sys/wait.h> +#include <sys/types.h> +#include <stdlib.h>
-#include "../hwprobe/hwprobe.h" -#include "../../kselftest.h" +#include "../../kselftest_harness.h" +#include "v_helpers.h"
#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 = fork(); - if (pid < 0) { - ksft_test_result_fail("fork failed %d", pid); - return -1; - } - - if (!pid) { - exec_argv[0] = NEXT_PROGRAM; - exec_argv[1] = test_inherit != 0 ? "x" : NULL; - exec_argv[2] = NULL; - exec_envp[0] = NULL; - /* launch the program again to check inherit */ - rc = execve(NEXT_PROGRAM, exec_argv, exec_envp); - if (rc) { - perror("execve"); - ksft_test_result_fail("child execve failed %d\n", rc); - exit(-1); - } - } - - rc = waitpid(-1, &status, 0); - if (rc < 0) { - ksft_test_result_fail("waitpid failed\n"); - return -3; - } - - if ((WIFEXITED(status) && WEXITSTATUS(status) == -1) || - WIFSIGNALED(status)) { - ksft_test_result_fail("child exited abnormally\n"); - return -4; - } - - return WEXITSTATUS(status); -}
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)
rc = prctl(PR_RISCV_V_SET_CONTROL, provided); if (rc != 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 = launch_test(inherit); + rc = launch_test(NEXT_PROGRAM, inherit); if (rc != expected) { - ksft_test_result_fail("Test failed, check %d != %ld\n", rc, - expected); + printf("Test failed, check %d != %ld\n", rc, expected); return -2; } return 0; @@ -70,112 +32,180 @@ int test_and_compare_child(long provided, long expected, int inherit) #define PR_RISCV_V_VSTATE_CTRL_CUR_SHIFT 0 #define PR_RISCV_V_VSTATE_CTRL_NEXT_SHIFT 2
-int main(void) +TEST(get_control_no_v) { - struct riscv_hwprobe pair; - long flag, expected; long rc;
- pair.key = RISCV_HWPROBE_KEY_IMA_EXT_0; - rc = 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");
- if (pair.key != RISCV_HWPROBE_KEY_IMA_EXT_0) { - ksft_test_result_fail("hwprobe cannot probe RISCV_HWPROBE_KEY_IMA_EXT_0\n"); - return -2; - } + rc = prctl(PR_RISCV_V_GET_CONTROL); + EXPECT_EQ(-1, rc) TH_LOG("GET_CONTROL should fail on kernel/hw without V"); + EXPECT_EQ(EINVAL, errno) TH_LOG("GET_CONTROL should fail on kernel/hw without V"); +}
- if (!(pair.value & RISCV_HWPROBE_IMA_V)) { - rc = prctl(PR_RISCV_V_GET_CONTROL); - if (rc != -1 || errno != EINVAL) { - ksft_test_result_fail("GET_CONTROL should fail on kernel/hw without V\n"); - return -3; - } - - rc = prctl(PR_RISCV_V_SET_CONTROL, PR_RISCV_V_VSTATE_CTRL_ON); - if (rc != -1 || errno != EINVAL) { - ksft_test_result_fail("GET_CONTROL should fail on kernel/hw without V\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 = 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 V"); + EXPECT_EQ(EINVAL, errno) TH_LOG("SET_CONTROL should fail on kernel/hw without V"); +} + +TEST(vstate_on_current) +{ + long flag; + long rc; + + if (!is_vector_supported()) + SKIP(return, "Vector not supported");
flag = PR_RISCV_V_VSTATE_CTRL_ON; rc = prctl(PR_RISCV_V_SET_CONTROL, flag); - if (rc != 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");
flag = PR_RISCV_V_VSTATE_CTRL_OFF; rc = prctl(PR_RISCV_V_SET_CONTROL, flag); - if (rc != -1 || errno != 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 with EPERM(%d)", errno); + EXPECT_EQ(-1, rc) TH_LOG("Disabling current's V alive must fail with EPERM(%d)", errno); +} + +TEST(vstate_on_no_nesting) +{ + long flag; + + if (!is_vector_supported()) + SKIP(return, "Vector not supported");
/* Turn on next's vector explicitly and test */ flag = 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");
/* Turn off next's vector explicitly and test */ flag = 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 = PR_RISCV_V_VSTATE_CTRL_ON << PR_RISCV_V_VSTATE_CTRL_NEXT_SHIFT; + flag |= PR_RISCV_V_VSTATE_CTRL_INHERIT; + expected = 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");
/* Turn on next's vector explicitly and test inherit */ flag = PR_RISCV_V_VSTATE_CTRL_ON << PR_RISCV_V_VSTATE_CTRL_NEXT_SHIFT; flag |= PR_RISCV_V_VSTATE_CTRL_INHERIT; expected = flag | PR_RISCV_V_VSTATE_CTRL_ON; - if (test_and_compare_child(flag, expected, 0)) - return -8;
- 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 = PR_RISCV_V_VSTATE_CTRL_OFF << PR_RISCV_V_VSTATE_CTRL_NEXT_SHIFT; + flag |= PR_RISCV_V_VSTATE_CTRL_INHERIT; + expected = 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");
/* Turn off next's vector explicitly and test inherit */ flag = PR_RISCV_V_VSTATE_CTRL_OFF << PR_RISCV_V_VSTATE_CTRL_NEXT_SHIFT; flag |= PR_RISCV_V_VSTATE_CTRL_INHERIT; expected = flag | PR_RISCV_V_VSTATE_CTRL_OFF; - if (test_and_compare_child(flag, expected, 0)) - return -10;
- 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");
- /* arguments should fail with EINVAL */ rc = prctl(PR_RISCV_V_SET_CONTROL, 0xff0); - if (rc != -1 || errno != 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");
rc = prctl(PR_RISCV_V_SET_CONTROL, 0x3); - if (rc != -1 || errno != EINVAL) { - ksft_test_result_fail("Undefined control argument should return EINVAL\n"); - return -12; - } + EXPECT_EQ(-1, rc); + EXPECT_EQ(EINVAL, errno); +}
- rc = prctl(PR_RISCV_V_SET_CONTROL, 0xc); - if (rc != -1 || errno != 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;
- rc = prctl(PR_RISCV_V_SET_CONTROL, 0xc); - if (rc != -1 || errno != EINVAL) { - ksft_test_result_fail("Undefined control argument should return EINVAL\n"); - return -12; - } + if (!is_vector_supported()) + SKIP(return, "Vector not supported");
- ksft_test_result_pass("tests for riscv_v_vstate_ctrl pass\n"); - ksft_exit_pass(); - return 0; + rc = prctl(PR_RISCV_V_SET_CONTROL, 0xc); + EXPECT_EQ(-1, rc); + EXPECT_EQ(EINVAL, errno); } + +TEST_HARNESS_MAIN
Extend existing vector tests to be compatible with the xtheadvector instructions.
Signed-off-by: Charlie Jenkins charlie@rivosinc.com --- .../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..58c29ea91b80 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 = 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] "=r" (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 + ".insn 0b00000000000000000111111011010111\n\t" + "mv %[vl], t4\n\t" + : [vl] "=r" (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] "=r" (vl) + );
#define CHECK_VECTOR_REGISTER(register) ({ \ for (int i = 0; i < vl; i++) { \ diff --git a/tools/testing/selftests/riscv/vector/v_helpers.c b/tools/testing/selftests/riscv/vector/v_helpers.c index 15c22318db72..2c4df76eefe9 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
#include "../hwprobe/hwprobe.h" +#include <asm/vendor/thead.h> #include <stdlib.h> #include <stdio.h> #include <unistd.h> #include <sys/wait.h>
+int is_xtheadvector_supported(void) +{ + struct riscv_hwprobe pair; + + pair.key = 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_IMA_V; }
-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;
pid = fork(); @@ -29,7 +39,8 @@ int launch_test(char *next_program, int test_inherit) if (!pid) { exec_argv[0] = next_program; exec_argv[1] = test_inherit != 0 ? "x" : NULL; - exec_argv[2] = NULL; + exec_argv[2] = xtheadvector != 0 ? "x" : NULL; + exec_argv[3] = NULL; exec_envp[0] = NULL; /* launch the program again to check inherit */ rc = execve(next_program, exec_argv, exec_envp); diff --git a/tools/testing/selftests/riscv/vector/v_helpers.h b/tools/testing/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 */
+int is_xtheadvector_supported(void); + int is_vector_supported(void);
-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/testing/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 @@
TEST(v_initval) { - if (!is_vector_supported()) - SKIP(return, "Vector not supported"); + int xtheadvector = 0;
- ASSERT_EQ(0, launch_test(NEXT_PROGRAM, 0)); + if (!is_vector_supported()) { + if (is_xtheadvector_supported()) + xtheadvector = 1; + else + SKIP(return, "Vector not supported"); + } + + ASSERT_EQ(0, launch_test(NEXT_PROGRAM, 0, xtheadvector)); }
TEST_HARNESS_MAIN diff --git a/tools/testing/selftests/riscv/vector/vstate_exec_nolibc.c b/tools/testing/selftests/riscv/vector/vstate_exec_nolibc.c index 1f9969bed235..12d30d3b90fa 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 @@
int main(int argc, char **argv) { - int rc, pid, status, test_inherit = 0; + int rc, pid, status, test_inherit = 0, xtheadvector = 0; long ctrl, ctrl_c; char *exec_argv[2], *exec_envp[2];
- if (argc > 1) + if (argc > 1 && strcmp(argv[1], "x")) test_inherit = 1;
+ if (argc > 2 && strcmp(argv[2], "x")) + xtheadvector = 1; + ctrl = 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 (".insn 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/testing/selftests/riscv/vector/vstate_prctl.c index 528e8c544db0..375af40e88e6 100644 --- a/tools/testing/selftests/riscv/vector/vstate_prctl.c +++ b/tools/testing/selftests/riscv/vector/vstate_prctl.c @@ -11,7 +11,7 @@
#define NEXT_PROGRAM "./vstate_exec_nolibc"
-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;
@@ -21,7 +21,7 @@ int test_and_compare_child(long provided, long expected, int inherit) provided, rc); return -1; } - rc = launch_test(NEXT_PROGRAM, inherit); + rc = launch_test(NEXT_PROGRAM, inherit, xtheadvector); if (rc != expected) { printf("Test failed, check %d != %ld\n", rc, expected); return -2; @@ -36,7 +36,7 @@ TEST(get_control_no_v) { long rc;
- if (is_vector_supported()) + if (is_vector_supported() || is_xtheadvector_supported()) SKIP(return, "Test expects vector to be not supported");
rc = prctl(PR_RISCV_V_GET_CONTROL); @@ -48,7 +48,7 @@ TEST(set_control_no_v) { long rc;
- if (is_vector_supported()) + if (is_vector_supported() || is_xtheadvector_supported()) SKIP(return, "Test expects vector to be not supported");
rc = prctl(PR_RISCV_V_SET_CONTROL, PR_RISCV_V_VSTATE_CTRL_ON); @@ -61,12 +61,12 @@ TEST(vstate_on_current) long flag; long rc;
- if (!is_vector_supported()) + if (!is_vector_supported() && !is_xtheadvector_supported()) SKIP(return, "Vector not supported");
flag = PR_RISCV_V_VSTATE_CTRL_ON; rc = 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"); }
TEST(vstate_off_eperm) @@ -74,99 +74,128 @@ TEST(vstate_off_eperm) long flag; long rc;
- if (!is_vector_supported()) + if (!is_vector_supported() && !is_xtheadvector_supported()) SKIP(return, "Vector not supported");
flag = PR_RISCV_V_VSTATE_CTRL_OFF; rc = prctl(PR_RISCV_V_SET_CONTROL, flag); - EXPECT_EQ(EPERM, errno) TH_LOG("Disabling current's V alive must fail with EPERM(%d)", errno); - EXPECT_EQ(-1, rc) TH_LOG("Disabling current's V alive must fail with EPERM(%d)", errno); + EXPECT_EQ(EPERM, errno) TH_LOG("Disabling V in current thread with V enabled must fail with EPERM(%d)", errno); + EXPECT_EQ(-1, rc) TH_LOG("Disabling V in current thread with V enabled must fail with EPERM(%d)", errno); }
TEST(vstate_on_no_nesting) { long flag; + int xtheadvector = 0;
- if (!is_vector_supported()) - SKIP(return, "Vector not supported"); + if (!is_vector_supported()) { + if (is_xtheadvector_supported()) + xtheadvector = 1; + else + SKIP(return, "Vector not supported"); + }
/* Turn on next's vector explicitly and test */ flag = PR_RISCV_V_VSTATE_CTRL_ON << PR_RISCV_V_VSTATE_CTRL_NEXT_SHIFT;
- 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, xtheadvector)); }
TEST(vstate_off_nesting) { long flag; + int xtheadvector = 0;
- if (!is_vector_supported()) - SKIP(return, "Vector not supported"); + if (!is_vector_supported()) { + if (is_xtheadvector_supported()) + xtheadvector = 1; + else + SKIP(return, "Vector not supported"); + }
/* Turn off next's vector explicitly and test */ flag = PR_RISCV_V_VSTATE_CTRL_OFF << PR_RISCV_V_VSTATE_CTRL_NEXT_SHIFT;
- 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)); }
TEST(vstate_on_inherit_no_nesting) { long flag, expected; + int xtheadvector = 0;
- if (!is_vector_supported()) - SKIP(return, "Vector not supported"); + if (!is_vector_supported()) { + if (is_xtheadvector_supported()) + xtheadvector = 1; + else + SKIP(return, "Vector not supported"); + }
/* Turn on next's vector explicitly and test no inherit */ flag = PR_RISCV_V_VSTATE_CTRL_ON << PR_RISCV_V_VSTATE_CTRL_NEXT_SHIFT; flag |= PR_RISCV_V_VSTATE_CTRL_INHERIT; expected = flag | PR_RISCV_V_VSTATE_CTRL_ON;
- EXPECT_EQ(0, test_and_compare_child(flag, expected, 0)); + EXPECT_EQ(0, test_and_compare_child(flag, expected, 0, xtheadvector)); }
TEST(vstate_on_inherit) { long flag, expected; + int xtheadvector = 0;
- if (!is_vector_supported()) - SKIP(return, "Vector not supported"); + if (!is_vector_supported()) { + if (is_xtheadvector_supported()) + xtheadvector = 1; + else + SKIP(return, "Vector not supported"); + }
/* Turn on next's vector explicitly and test inherit */ flag = PR_RISCV_V_VSTATE_CTRL_ON << PR_RISCV_V_VSTATE_CTRL_NEXT_SHIFT; flag |= PR_RISCV_V_VSTATE_CTRL_INHERIT; expected = flag | PR_RISCV_V_VSTATE_CTRL_ON;
- EXPECT_EQ(0, test_and_compare_child(flag, expected, 1)); + EXPECT_EQ(0, test_and_compare_child(flag, expected, 1, xtheadvector)); }
TEST(vstate_off_inherit_no_nesting) { long flag, expected; + int xtheadvector = 0;
- if (!is_vector_supported()) - SKIP(return, "Vector not supported"); - + if (!is_vector_supported()) { + if (is_xtheadvector_supported()) + xtheadvector = 1; + else + SKIP(return, "Vector not supported"); + } /* Turn off next's vector explicitly and test no inherit */ flag = PR_RISCV_V_VSTATE_CTRL_OFF << PR_RISCV_V_VSTATE_CTRL_NEXT_SHIFT; flag |= PR_RISCV_V_VSTATE_CTRL_INHERIT; expected = flag | PR_RISCV_V_VSTATE_CTRL_OFF;
- EXPECT_EQ(0, test_and_compare_child(flag, expected, 0)); + EXPECT_EQ(0, test_and_compare_child(flag, expected, 0, xtheadvector)); }
TEST(vstate_off_inherit) { long flag, expected; + int xtheadvector = 0;
- if (!is_vector_supported()) - SKIP(return, "Vector not supported"); + if (!is_vector_supported()) { + if (is_xtheadvector_supported()) + xtheadvector = 1; + else + SKIP(return, "Vector not supported"); + }
/* Turn off next's vector explicitly and test inherit */ flag = PR_RISCV_V_VSTATE_CTRL_OFF << PR_RISCV_V_VSTATE_CTRL_NEXT_SHIFT; flag |= PR_RISCV_V_VSTATE_CTRL_INHERIT; expected = flag | PR_RISCV_V_VSTATE_CTRL_OFF;
- EXPECT_EQ(0, test_and_compare_child(flag, expected, 1)); + EXPECT_EQ(0, test_and_compare_child(flag, expected, 1, xtheadvector)); }
/* arguments should fail with EINVAL */ @@ -174,7 +203,7 @@ TEST(inval_set_control_1) { int rc;
- if (!is_vector_supported()) + if (!is_vector_supported() && !is_xtheadvector_supported()) SKIP(return, "Vector not supported");
rc = prctl(PR_RISCV_V_SET_CONTROL, 0xff0); @@ -187,7 +216,7 @@ TEST(inval_set_control_2) { int rc;
- if (!is_vector_supported()) + if (!is_vector_supported() && !is_xtheadvector_supported()) SKIP(return, "Vector not supported");
rc = prctl(PR_RISCV_V_SET_CONTROL, 0x3); @@ -200,7 +229,7 @@ TEST(inval_set_control_3) { int rc;
- if (!is_vector_supported()) + if (!is_vector_supported() && !is_xtheadvector_supported()) SKIP(return, "Vector not supported");
rc = prctl(PR_RISCV_V_SET_CONTROL, 0xc);
linux-kselftest-mirror@lists.linaro.org
-
Charlie Jenkins -
Chen-Yu Tsai -
Conor Dooley -
Guo Ren -
Samuel Holland -
Yu-Chien Peter Lin