linux-kernel - [PATCH v3 0/7] Support Zve32[xf] and Zve64[xfd] Vector subextensions

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Message-Id: <20240318-zve-detection-v3-0-e12d42107fa8@sifive.com>
Date: Mon, 18 Mar 2024 18:39:53 +0800
From: Andy Chiu <andy.chiu@...ive.com>
To: Paul Walmsley <paul.walmsley@...ive.com>, 
 Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, 
 Andy Chiu <andy.chiu@...ive.com>, Vincent Chen <vincent.chen@...ive.com>, 
 Heiko Stuebner <heiko@...ech.de>, Conor Dooley <conor.dooley@...rochip.com>, 
 Conor Dooley <conor@...nel.org>, Rob Herring <robh+dt@...nel.org>, 
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, 
 Jonathan Corbet <corbet@....net>
Cc: linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 Palmer Dabbelt <palmer@...osinc.com>, 
 Greentime Hu <greentime.hu@...ive.com>, Guo Ren <guoren@...nel.org>, 
 devicetree@...r.kernel.org, linux-doc@...r.kernel.org, 
 Clément Léger <cleger@...osinc.com>, 
 Joel Granados <j.granados@...sung.com>
Subject: [PATCH v3 0/7] Support Zve32[xf] and Zve64[xfd] Vector
 subextensions

The series composes of two parts. The first part provides a quick fix for
the issue on a recent thread[1]. The issue happens when a platform has
ununified vector register length across multiple cores. Specifically,
patch 1 adds a comment at a callsite of riscv_setup_vsize to clarify how
vlenb is observed by the system. Patch 2 fixes the issue by failing the
boot process of a secondary core if vlenb mismatches.

The second part of the series provide a finer grain view of the Vector
extension. Patch 3 give the obsolete ISA parser the ability to expand
ISA extensions for sigle letter extensions. Patch 3, 4 introduces Zve32x,
Zve32f, Zve64x, Zve64f, Zve64d for isa parsing and hwprobe. Patch 5
updates all callsites such that Vector subextensions are maximumly
supported by the kernel.

Two parts of the series are sent together to ease the effort of picking
dependency patches. The first part can be merged independent of the
second one if necessary.

The series is tested on a QEMU and verified that booting, Vector
programs context-switch, signal, ptrace, prctl(sysctl knob) interfaces
works when we only report partial V from the ISA.

This patch should be able to apply on risc-v for-next branch on top of
the commit 099dbac6e90c ("Merge patch series "riscv: Use Kconfig to set unaligned access speed"")

[1]: https://lore.kernel.org/all/20240228-vicinity-cornstalk-4b8eb5fe5730@spud/T/#u

v2 of this series can be found at: https://lore.kernel.org/all/20240314142542.19957-1-andy.chiu@sifive.com/

Changelog v3:
 - Include correct maintainers and mailing list into CC.
 - Cleanup isa string parser code (3)
 - Adjust extensions order and name (4, 5)
 - Refine commit message (6)

Changelog v2:
 - Update comments and commit messages (1, 2, 7)
 - Refine isa_exts[] lists for zve extensions (4)
 - Add a patch for dt-binding (5)
 - Make ZVE* extensions depend on has_vector(ZVE32X) (6, 7)

---
Andy Chiu (7):
      riscv: vector: add a comment when calling riscv_setup_vsize()
      riscv: smp: fail booting up smp if inconsistent vlen is detected
      riscv: cpufeature: call match_isa_ext() for single-letter extensions
      riscv: cpufeature: add zve32[xf] and zve64[xfd] isa detection
      dt-bindings: riscv: add Zve32[xf] Zve64[xfd] ISA extension description
      riscv: hwprobe: add zve Vector subextensions into hwprobe interface
      riscv: vector: adjust minimum Vector requirement to ZVE32X

 Documentation/arch/riscv/hwprobe.rst               | 15 ++++++
 .../devicetree/bindings/riscv/extensions.yaml      | 30 ++++++++++++
 arch/riscv/include/asm/hwcap.h                     |  5 ++
 arch/riscv/include/asm/switch_to.h                 |  2 +-
 arch/riscv/include/asm/vector.h                    | 21 +++++---
 arch/riscv/include/asm/xor.h                       |  2 +-
 arch/riscv/include/uapi/asm/hwprobe.h              |  5 ++
 arch/riscv/kernel/cpufeature.c                     | 56 ++++++++++++++++++----
 arch/riscv/kernel/head.S                           | 14 +++---
 arch/riscv/kernel/kernel_mode_vector.c             |  4 +-
 arch/riscv/kernel/process.c                        |  4 +-
 arch/riscv/kernel/signal.c                         |  6 +--
 arch/riscv/kernel/smpboot.c                        | 14 ++++--
 arch/riscv/kernel/sys_hwprobe.c                    | 13 ++++-
 arch/riscv/kernel/vector.c                         | 15 +++---
 arch/riscv/lib/uaccess.S                           |  2 +-
 16 files changed, 163 insertions(+), 45 deletions(-)
---
base-commit: 099dbac6e90c620d8ce0bbf75bbdc94da1feb4fb
change-id: 20240318-zve-detection-50106d2da527

Best regards,
-- 
Andy Chiu <andy.chiu@...ive.com>