linux-kernel - Re: [PATCH 1/2] powerpc: iommu: Bring back table group release

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Message-ID: <20240126151701.GZ50608@ziepe.ca>
Date: Fri, 26 Jan 2024 11:17:01 -0400
From: Jason Gunthorpe <jgg@...pe.ca>
To: Shivaprasad G Bhat <sbhat@...ux.ibm.com>
Cc: iommu@...ts.linux.dev, linuxppc-dev@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org, mpe@...erman.id.au, npiggin@...il.com,
	christophe.leroy@...roup.eu, aneesh.kumar@...nel.org,
	naveen.n.rao@...ux.ibm.com, jroedel@...e.de,
	tpearson@...torengineering.com, aik@....com, bgray@...ux.ibm.com,
	gregkh@...uxfoundation.org, gbatra@...ux.vnet.ibm.com,
	vaibhav@...ux.ibm.com
Subject: Re: [PATCH 1/2] powerpc: iommu: Bring back table group
 release_ownership() call

On Fri, Jan 26, 2024 at 08:43:12PM +0530, Shivaprasad G Bhat wrote:
> > Also, is there any chance someone can work on actually fixing this to
> > be a proper iommu driver? I think that will become important for power
> > to use the common dma_iommu code in the next year...
> We are looking into it.

Okay, let me know, I can possibly help make parts of this happen

power is the last still-current architecture to be outside the modern
IOMMU and DMA API design and I'm going to start proposing things that
will not be efficient on power because of this.

I think a basic iommu driver using the dma API would not be so hard.

I don't know what to do about the SPAPR VFIO mess though. :(

Jason