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Message-ID: <20240709062015.GB16180@lst.de>
Date: Tue, 9 Jul 2024 08:20:15 +0200
From: Christoph Hellwig <hch@....de>
To: Jason Gunthorpe <jgg@...pe.ca>
Cc: Christoph Hellwig <hch@....de>, Leon Romanovsky <leon@...nel.org>,
Jens Axboe <axboe@...nel.dk>, Robin Murphy <robin.murphy@....com>,
Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
Keith Busch <kbusch@...nel.org>, "Zeng, Oak" <oak.zeng@...el.com>,
Chaitanya Kulkarni <kch@...dia.com>,
Sagi Grimberg <sagi@...mberg.me>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Logan Gunthorpe <logang@...tatee.com>,
Yishai Hadas <yishaih@...dia.com>,
Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>,
Kevin Tian <kevin.tian@...el.com>,
Alex Williamson <alex.williamson@...hat.com>,
Marek Szyprowski <m.szyprowski@...sung.com>,
Jérôme Glisse <jglisse@...hat.com>,
Andrew Morton <akpm@...ux-foundation.org>,
linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-rdma@...r.kernel.org, iommu@...ts.linux.dev,
linux-nvme@...ts.infradead.org, linux-pci@...r.kernel.org,
kvm@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [RFC PATCH v1 00/18] Provide a new two step DMA API mapping API
On Mon, Jul 08, 2024 at 08:57:21PM -0300, Jason Gunthorpe wrote:
> I understand the block stack already does this using P2P and !P2P, but
> that isn't quite enough here as we want to split principally based on
> IOMMU or !IOMMU.
Except for the powerpc bypass IOMMU or not is a global decision,
and the bypass is per I/O. So I'm not sure what else you want there?
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