linux-kernel - Re: [PATCH v1 09/17] docs: core-api: document the IOVA-based API

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Message-ID: <20241031075928.GA7473@unreal>
Date: Thu, 31 Oct 2024 09:59:28 +0200
From: Leon Romanovsky <leon@...nel.org>
To: Randy Dunlap <rdunlap@...radead.org>
Cc: Jens Axboe <axboe@...nel.dk>, Jason Gunthorpe <jgg@...pe.ca>,
	Robin Murphy <robin.murphy@....com>, Joerg Roedel <joro@...tes.org>,
	Will Deacon <will@...nel.org>, Christoph Hellwig <hch@....de>,
	Sagi Grimberg <sagi@...mberg.me>, Keith Busch <kbusch@...nel.org>,
	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>,
	Jonathan Corbet <corbet@....net>, 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, linux-pci@...r.kernel.org,
	kvm@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH v1 09/17] docs: core-api: document the IOVA-based API

On Wed, Oct 30, 2024 at 06:41:21PM -0700, Randy Dunlap wrote:
> (nits)
> 
> On 10/30/24 8:12 AM, Leon Romanovsky wrote:
> > From: Christoph Hellwig <hch@....de>
> > 
> > Add an explanation of the newly added IOVA-based mapping API.
> > 
> > Signed-off-by: Christoph Hellwig <hch@....de>
> > Signed-off-by: Leon Romanovsky <leonro@...dia.com>
> > ---
> >  Documentation/core-api/dma-api.rst | 70 ++++++++++++++++++++++++++++++
> >  1 file changed, 70 insertions(+)

<...>

> > +These APIs allow a very efficient mapping when using an IOMMU.  They are an
> > +optional path that requires extra code and are only recommended for drivers
> > +where DMA mapping performance, or the space usage for storing the DMA addresses
> > +matter.  All the consideration from the previous section apply here as well.
> 
>                     considerations

<...>

> > +is used to unmap a range previous mapped, and
> 
>                             previously

Thanks