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Message-ID: <20240312212844.GA3018@lst.de>
Date: Tue, 12 Mar 2024 22:28:44 +0100
From: Christoph Hellwig <hch@....de>
To: Leon Romanovsky <leon@...nel.org>
Cc: Christoph Hellwig <hch@....de>, Jason Gunthorpe <jgg@...pe.ca>,
Robin Murphy <robin.murphy@....com>,
Marek Szyprowski <m.szyprowski@...sung.com>,
Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
Chaitanya Kulkarni <chaitanyak@...dia.com>,
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Keith Busch <kbusch@...nel.org>, Sagi Grimberg <sagi@...mberg.me>,
Yishai Hadas <yishaih@...dia.com>,
Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>,
Kevin Tian <kevin.tian@...el.com>,
Alex Williamson <alex.williamson@...hat.com>,
Jérôme Glisse <jglisse@...hat.com>,
Andrew Morton <akpm@...ux-foundation.org>,
linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-block@...r.kernel.org, linux-rdma@...r.kernel.org,
iommu@...ts.linux.dev, linux-nvme@...ts.infradead.org,
kvm@...r.kernel.org, linux-mm@...ck.org,
Bart Van Assche <bvanassche@....org>,
Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
Amir Goldstein <amir73il@...il.com>,
"josef@...icpanda.com" <josef@...icpanda.com>,
"Martin K. Petersen" <martin.petersen@...cle.com>,
"daniel@...earbox.net" <daniel@...earbox.net>,
Dan Williams <dan.j.williams@...el.com>,
"jack@...e.com" <jack@...e.com>, Zhu Yanjun <zyjzyj2000@...il.com>
Subject: Re: [RFC RESEND 00/16] Split IOMMU DMA mapping operation to two
steps
On Sun, Mar 10, 2024 at 11:35:13AM +0200, Leon Romanovsky wrote:
> And you will need to have a way to instruct that pin_user_pages() variant
> to continue anyway, because you asked for FOLL_PCI_P2PDMA. Without that
> force, you will have !FOLL_PCI_P2PDMA behaviour.
I don't understand what you mean.
> When you say "simplify the overall interface", which interface do you mean?
Primarily the dma mapping interface. Secondarily also everything around
it.
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