linux-kernel - Re: [PATCH v5 2/6] RISC-V: Add a syscall for HW probing

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Date:   Wed, 5 Apr 2023 13:57:16 +0000 (UTC)
From:   Paul Walmsley <paul@...an.com>
To:     Evan Green <evan@...osinc.com>
cc:     Palmer Dabbelt <palmer@...osinc.com>, slewis@...osinc.com,
        vineetg@...osinc.com, heiko@...ech.de,
        Conor Dooley <conor@...nel.org>,
        Conor Dooley <conor.dooley@...rochip.com>,
        Heiko Stuebner <heiko.stuebner@...ll.eu>,
        Albert Ou <aou@...s.berkeley.edu>,
        Andrew Bresticker <abrestic@...osinc.com>,
        Arnd Bergmann <arnd@...db.de>,
        Bagas Sanjaya <bagasdotme@...il.com>,
        Celeste Liu <coelacanthus@...look.com>,
        Guo Ren <guoren@...nel.org>, Jonathan Corbet <corbet@....net>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Tobias Klauser <tklauser@...tanz.ch>,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v5 2/6] RISC-V: Add a syscall for HW probing

On Mon, 27 Mar 2023, Evan Green wrote:

> We don't have enough space for these all in ELF_HWCAP{,2} and there's no
> system call that quite does this, so let's just provide an arch-specific
> one to probe for hardware capabilities.  This currently just provides
> m{arch,imp,vendor}id, but with the key-value pairs we can pass more in
> the future.
> 
> Co-developed-by: Palmer Dabbelt <palmer@...osinc.com>
> Signed-off-by: Palmer Dabbelt <palmer@...osinc.com>
> Signed-off-by: Evan Green <evan@...osinc.com>
> Reviewed-by: Conor Dooley <conor.dooley@...rochip.com>
> Reviewed-by: Heiko Stuebner <heiko.stuebner@...ll.eu>
> Tested-by: Heiko Stuebner <heiko.stuebner@...ll.eu>

Folks are already building RISC-V systems with cores that have different 
feature sets inside the same Linux system image - just like some ARM 
vendors are - so it makes sense to pass this information onto userspace.

By the way, Evan, did you intend to update the copyright dates to include 
2023?

Beyond that, 

Reviewed-by: Paul Walmsley <paul.walmsley@...ive.com>


- Paul