linux-kernel - Re: [PATCH v2 02/19] riscv: add ISA extension parsing for scalar crypto

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Date:   Mon, 23 Oct 2023 09:21:28 -0700
From:   Evan Green <evan@...osinc.com>
To:     Clément Léger <cleger@...osinc.com>
Cc:     linux-riscv@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        Palmer Dabbelt <palmer@...osinc.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Albert Ou <aou@...s.berkeley.edu>,
        Jonathan Corbet <corbet@....net>,
        Andrew Jones <ajones@...tanamicro.com>,
        Conor Dooley <conor@...nel.org>,
        Samuel Ortiz <sameo@...osinc.com>,
        Conor Dooley <conor.dooley@...rochip.com>
Subject: Re: [PATCH v2 02/19] riscv: add ISA extension parsing for scalar crypto

On Tue, Oct 17, 2023 at 6:15 AM Clément Léger <cleger@...osinc.com> wrote:
>
> From: Evan Green <evan@...osinc.com>
>
> The Scalar Crypto specification defines Zk as a shorthand for the
> Zkn, Zkr and Zkt extensions. The same follows for both Zkn, Zks and Zbk,
> which are all shorthands for various other extensions. The detailed
> breakdown can be found in their dt-binding entries.
>
> Since Zkn also implies the Zbkb, Zbkc and Zbkx extensions, simply passing
> "zk" through a DT should enable all of Zbkb, Zbkc, Zbkx, Zkn, Zkr and Zkt.
> For example, setting the "riscv,isa" DT property to "rv64imafdc_zk"
> should generate the following cpuinfo output:
> "rv64imafdc_zicntr_zicsr_zifencei_zihpm_zbkb_zbkc_zbkx_zknd_zkne_zknh_zkr_zkt"
>
> riscv_isa_ext_data grows a pair of new members, to permit setting the
> relevant bits for "bundled" extensions, both while parsing the ISA string
> and the new dedicated extension properties
>
> Co-developed-by: Conor Dooley <conor.dooley@...rochip.com>
> Signed-off-by: Conor Dooley <conor.dooley@...rochip.com>
> Signed-off-by: Evan Green <evan@...osinc.com>
> Signed-off-by: Clément Léger <cleger@...osinc.com>

My tree might be out of sync, but in my search for riscv_isa_ext, I
also found a use in print_isa() (cpu.c) where we're reaching into
riscv_isa_ext[].id and assuming it's always valid. If that's still in
there we'll want to fix up that spot too, since now with bundles .id
may or may not be valid.

-Evan