linux-kernel - Re: [PATCH v6 0/6] RISC-V Hardware Probing User Interface

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Message-Id: <168201218504.13763.1031176103296142331.b4-ty@rivosinc.com>
Date:   Thu, 20 Apr 2023 10:36:25 -0700
From:   Palmer Dabbelt <palmer@...osinc.com>
To:     Evan Green <evan@...osinc.com>
Cc:     slewis@...osinc.com, heiko@...ech.de,
        Conor Dooley <conor@...nel.org>,
        Vineet Gupta <vineetg@...osinc.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Andrew Bresticker <abrestic@...osinc.com>,
        Andrew Jones <ajones@...tanamicro.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Anup Patel <apatel@...tanamicro.com>,
        Atish Patra <atishp@...osinc.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Celeste Liu <coelacanthus@...look.com>,
        Conor Dooley <conor.dooley@...rochip.com>,
        Guo Ren <guoren@...nel.org>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Heiko Stuebner <heiko.stuebner@...ll.eu>,
        Jann Horn <jannh@...gle.com>,
        Jisheng Zhang <jszhang@...nel.org>,
        Jonathan Corbet <corbet@....net>,
        Ley Foon Tan <leyfoon.tan@...rfivetech.com>,
        "Liam R. Howlett" <Liam.Howlett@...cle.com>,
        Mark Brown <broonie@...nel.org>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Philipp Tomsich <philipp.tomsich@...ll.eu>,
        Samuel Holland <samuel@...lland.org>,
        Shuah Khan <shuah@...nel.org>,
        Sunil V L <sunilvl@...tanamicro.com>,
        Tobias Klauser <tklauser@...tanz.ch>,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org, linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v6 0/6] RISC-V Hardware Probing User Interface


On Fri, 07 Apr 2023 16:10:57 -0700, Evan Green wrote:
> There's been a bunch of off-list discussions about this, including at
> Plumbers.  The original plan was to do something involving providing an
> ISA string to userspace, but ISA strings just aren't sufficient for a
> stable ABI any more: in order to parse an ISA string users need the
> version of the specifications that the string is written to, the version
> of each extension (sometimes at a finer granularity than the RISC-V
> releases/versions encode), and the expected use case for the ISA string
> (ie, is it a U-mode or M-mode string).  That's a lot of complexity to
> try and keep ABI compatible and it's probably going to continue to grow,
> as even if there's no more complexity in the specifications we'll have
> to deal with the various ISA string parsing oddities that end up all
> over userspace.
> 
> [...]

Applied, thanks!

[1/6] RISC-V: Move struct riscv_cpuinfo to new header
      https://git.kernel.org/palmer/c/ff77cf5b2e03
[2/6] RISC-V: Add a syscall for HW probing
      https://git.kernel.org/palmer/c/ea3de9ce8aa2
[3/6] RISC-V: hwprobe: Add support for RISCV_HWPROBE_BASE_BEHAVIOR_IMA
      https://git.kernel.org/palmer/c/00e76e2c6a2b
[4/6] RISC-V: hwprobe: Support probing of misaligned access performance
      https://git.kernel.org/palmer/c/62a31d6e38bd
[5/6] selftests: Test the new RISC-V hwprobe interface
      https://git.kernel.org/palmer/c/287dcc2b0c83
[6/6] RISC-V: Add hwprobe vDSO function and data
      https://git.kernel.org/palmer/c/aa5af0aa90ba

Best regards,
-- 
Palmer Dabbelt <palmer@...osinc.com>