linux-kernel - Re: [RFC RESEND 00/16] Split IOMMU DMA mapping operation to two steps

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Date: Wed, 13 Mar 2024 09:46:36 +0200
From: Leon Romanovsky <leon@...nel.org>
To: Christoph Hellwig <hch@....de>
Cc: 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>,
	Jonathan Corbet <corbet@....net>, Jens Axboe <axboe@...nel.dk>,
	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 Tue, Mar 12, 2024 at 10:28:44PM +0100, Christoph Hellwig wrote:
> 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.

Jason talked about the need to call to pin_user_pages(..., gup_flags | FOLL_PCI_P2PDMA, ...),
but in your proposal this call won't be possible anymore.

> 
> > When you say "simplify the overall interface", which interface do you mean?
> 
> Primarily the dma mapping interface.  Secondarily also everything around
> it.

OK, thanks