linux-kernel - [PATCH 0/3] RISC-V: Export Zba, Zbb to usermode via hwprobe

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Message-Id: <20230428190609.3239486-1-evan@rivosinc.com>
Date:   Fri, 28 Apr 2023 12:06:05 -0700
From:   Evan Green <evan@...osinc.com>
To:     Palmer Dabbelt <palmer@...osinc.com>
Cc:     Evan Green <evan@...osinc.com>, Albert Ou <aou@...s.berkeley.edu>,
        Andrew Bresticker <abrestic@...osinc.com>,
        Andrew Jones <ajones@...tanamicro.com>,
        Anup Patel <apatel@...tanamicro.com>,
        Celeste Liu <coelacanthus@...look.com>,
        Conor Dooley <conor.dooley@...rochip.com>,
        Dao Lu <daolu@...osinc.com>,
        Heiko Stuebner <heiko.stuebner@...ll.eu>,
        Jisheng Zhang <jszhang@...nel.org>,
        Jonathan Corbet <corbet@....net>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Sunil V L <sunilvl@...tanamicro.com>,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-riscv@...ts.infradead.org
Subject: [PATCH 0/3] RISC-V: Export Zba, Zbb to usermode via hwprobe


This change detects the presence of Zba and Zbb extensions and exports
them per-hart to userspace via the hwprobe mechanism. Glibc can then use
these in setting up hwcaps-based library search paths.

There's a little bit of extra housekeeping here: the first change adds
Zba to the set of extensions the kernel recognizes, and the second
change starts tracking ISA features per-hart (in addition to the ANDed
mask of features across all harts which the kernel uses to make
decisions). Now that we track the ISA information per-hart, we could
even fix up /proc/cpuinfo to accurately report extension per-hart,
though I've left that out of this series for now.


Evan Green (3):
  RISC-V: Add Zba extension probing
  RISC-V: Track ISA extensions per hart
  RISC-V: hwprobe: Expose Zba and Zbb

 Documentation/riscv/hwprobe.rst       |  7 +++++
 arch/riscv/include/asm/cpufeature.h   | 10 +++++++
 arch/riscv/include/asm/hwcap.h        |  1 +
 arch/riscv/include/uapi/asm/hwprobe.h |  2 ++
 arch/riscv/kernel/cpu.c               |  1 +
 arch/riscv/kernel/cpufeature.c        | 19 ++++++++----
 arch/riscv/kernel/sys_riscv.c         | 43 ++++++++++++++++++++++-----
 7 files changed, 70 insertions(+), 13 deletions(-)

-- 
2.25.1