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Date:   Wed, 15 Jan 2020 12:36:02 -0800 (PST)
From:   Palmer Dabbelt <palmerdabbelt@google.com>
Subject:     Re: [PATCH v6 0/5] Add support for SBI v0.2 
CC:     linux-kernel@vger.kernel.org, Atish Patra <Atish.Patra@wdc.com>,
        aou@eecs.berkeley.edu, anup@brainfault.org,
        linux-riscv@lists.infradead.org, rppt@linux.ibm.com,
        Paul Walmsley <paul.walmsley@sifive.com>, tglx@linutronix.de,
        atishp@atishpatra.org
To:     Atish Patra <Atish.Patra@wdc.com>
In-Reply-To: <20191218213918.16676-1-atish.patra@wdc.com>
References: <20191218213918.16676-1-atish.patra@wdc.com>
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On Wed, 18 Dec 2019 13:39:13 PST (-0800), Atish Patra wrote:
> The Supervisor Binary Interface(SBI) specification[1] now defines a
> base extension that provides extendability to add future extensions
> while maintaining backward compatibility with previous versions.
> The new version is defined as 0.2 and older version is marked as 0.1.
>
>
> This series adds support v0.2 and a unified calling convention
> implementation between 0.1 and 0.2. It also add other SBI v0.2
> functionality defined in [2]. The base support for SBI v0.2 is already
> available in OpenSBI v0.5. This series needs additional patches[3] in
> OpenSBI.
>
> Tested on both BBL, OpenSBI with/without the above patch series.
>
> [1] https://github.com/riscv/riscv-sbi-doc/blob/master/riscv-sbi.adoc
> [2] https://github.com/riscv/riscv-sbi-doc/pull/27
> [3] http://lists.infradead.org/pipermail/opensbi/2019-November/000738.html
>
> Changes from v5->v6
> 1. Fixed few compilation issues around config.
> 2. Fixed hart mask generation issues for RFENCE & IPI extensions.
>
> Changes from v4->v5
> 1. Fixed few minor comments related to static & inline.
> 2. Make sure that every patch is boot tested individually.
>
> Changes from v3->v4.
> 1. Rebased on for-next.
> 2. Fixed issuses with checkpatch --strict.
> 3. Unfied all IPI/fence related functions.
> 4. Added Hfence related SBI calls.
>
> Changes from v2->v3.
> 1. Moved v0.1 extensions to a new config.
> 2. Added support for relacement extensions of v0.1 extensions.
>
> Changes from v1->v2
> 1. Removed the legacy calling convention.
> 2. Moved all SBI related calls to sbi.c.
> 3. Moved all SBI related macros to uapi.
>
> Atish Patra (5):
> RISC-V: Mark existing SBI as 0.1 SBI.
> RISC-V: Add basic support for SBI v0.2
> RISC-V: Add SBI v0.2 extension definitions
> RISC-V: Introduce a new config for SBI v0.1
> RISC-V: Implement new SBI v0.2 extensions
>
> arch/riscv/Kconfig           |   6 +
> arch/riscv/include/asm/sbi.h | 178 +++++++-----
> arch/riscv/kernel/sbi.c      | 522 ++++++++++++++++++++++++++++++++++-
> arch/riscv/kernel/setup.c    |   2 +
> 4 files changed, 635 insertions(+), 73 deletions(-)

Thanks.  I had a few comments on the spec, but this looks good given what's in
the draft.