linux-kernel - Re: [PATCH v3 3/3] iommu/riscv: Add ACPI support

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Message-ID: <aHOc1Syl1roOd5Pz@willie-the-truck>
Date: Sun, 13 Jul 2025 12:47:33 +0100
From: Will Deacon <will@...nel.org>
To: Sunil V L <sunilvl@...tanamicro.com>
Cc: linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
	linux-acpi@...r.kernel.org, iommu@...ts.linux.dev,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>, Alexandre Ghiti <alex@...ti.fr>,
	"Rafael J . Wysocki" <rafael@...nel.org>,
	Len Brown <lenb@...nel.org>, Tomasz Jeznach <tjeznach@...osinc.com>,
	Joerg Roedel <joro@...tes.org>, Robin Murphy <robin.murphy@....com>,
	Anup Patel <apatel@...tanamicro.com>,
	Atish Patra <atishp@...osinc.com>,
	Andrew Jones <ajones@...tanamicro.com>
Subject: Re: [PATCH v3 3/3] iommu/riscv: Add ACPI support

On Mon, Jun 30, 2025 at 09:18:03AM +0530, Sunil V L wrote:
> RISC-V IO Mapping Table (RIMT) provides the information about the IOMMU
> to the OS in ACPI. Add support for ACPI in RISC-V IOMMU drivers by using
> RIMT data.
> 
> The changes at high level are,
> 
> a) Register the IOMMU with RIMT data structures.
> b) Enable probing of platform IOMMU in ACPI way using the ACPIID defined
>    for the RISC-V IOMMU in the BRS spec [1]. Configure the MSI domain if
>    the platform IOMMU uses MSIs.
> 
> [1] - https://github.com/riscv-non-isa/riscv-brs/blob/main/acpi-id.adoc
> 
> Signed-off-by: Sunil V L <sunilvl@...tanamicro.com>
> ---
>  drivers/iommu/riscv/iommu-platform.c | 17 ++++++++++++++++-
>  drivers/iommu/riscv/iommu.c          | 10 ++++++++++
>  2 files changed, 26 insertions(+), 1 deletion(-)

This looks relatively straightforward from the IOMMU perspective
(assuming the driver still compiles if CONFIG_ACPI=n) but the ACPI parts
in the first two patches need reviewing before this can land.

Will