linux-kernel - Re: [PATCH v5 2/7] iommu/riscv: Add RISC-V IOMMU platform device driver

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Date: Fri, 24 May 2024 12:09:34 -0300
From: Jason Gunthorpe <jgg@...pe.ca>
To: Tomasz Jeznach <tjeznach@...osinc.com>
Cc: Anup Patel <apatel@...tanamicro.com>, Zong Li <zong.li@...ive.com>,
	Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
	Robin Murphy <robin.murphy@....com>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	devicetree@...r.kernel.org, Conor Dooley <conor+dt@...nel.org>,
	Albert Ou <aou@...s.berkeley.edu>, linux@...osinc.com,
	linux-kernel@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
	Sebastien Boeuf <seb@...osinc.com>, iommu@...ts.linux.dev,
	Palmer Dabbelt <palmer@...belt.com>,
	Nick Kossifidis <mick@....forth.gr>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	linux-riscv@...ts.infradead.org,
	Lu Baolu <baolu.lu@...ux.intel.com>
Subject: Re: [PATCH v5 2/7] iommu/riscv: Add RISC-V IOMMU platform device
 driver

On Thu, May 23, 2024 at 09:13:43AM -0700, Tomasz Jeznach wrote:
> > > The activation of IOMMU_DMA for the RISC-V architecture will be
> > > feasible once the core components achieve compatibility with the DMA
> > > subsystem, which unfortunately is currently not the case. Without
> > > IOMMU_DMA enabled, driver will recognize RISC-V IOMMU hardware,
> > > register itself in the IOMMU core subsystem, and will provide basic
> > > IDENTITY protection domains for connected devices.
> >
> > I am not asking for IOMMU_DMA feature instead I am asking for
> > supporting device MSIs in this series.
> >
> 
> Ok. Makes sense.
> I've looked at the option to pull in / add small change to enable MSI
> bypass window for systems with IMSIC enabled. With that, MSIs will be
> supported, however without full interrupt remapping capabilities that
> could IOMMU provide. If that sounds as sufficient change I'll add it
> to this series.

Honestly I would prefer you keep that seperate as we really need to
discuss the irq window stuff in alot of detail. The current thing ARM
has done comes with alot of problems.

This series seems pretty good to me as is, let's get it merged.

Jason