From: Christoph Hellwig <hch@infradead.org>
To: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Christoph Hellwig <hch@infradead.org>,
Yonatan Maman <ymaman@nvidia.com>,
nouveau@lists.freedesktop.org, linux-kernel@vger.kernel.org,
linux-rdma@vger.kernel.org, linux-mm@kvack.org,
herbst@redhat.com, lyude@redhat.com, dakr@redhat.com,
airlied@gmail.com, simona@ffwll.ch, leon@kernel.org,
jglisse@redhat.com, akpm@linux-foundation.org,
dri-devel@lists.freedesktop.org, apopple@nvidia.com,
bskeggs@nvidia.com, Gal Shalom <GalShalom@nvidia.com>
Subject: Re: [PATCH v1 1/4] mm/hmm: HMM API for P2P DMA to device zone pages
Date: Thu, 17 Oct 2024 06:49:30 -0700 [thread overview]
Message-ID: <ZxEV6ocpKLjPC8H4@infradead.org> (raw)
In-Reply-To: <20241017134644.GA948948@ziepe.ca>
On Thu, Oct 17, 2024 at 10:46:44AM -0300, Jason Gunthorpe wrote:
> On Thu, Oct 17, 2024 at 06:12:55AM -0700, Christoph Hellwig wrote:
> > On Thu, Oct 17, 2024 at 10:05:39AM -0300, Jason Gunthorpe wrote:
> > > Broadly I think whatever flow NVMe uses for P2P will apply to ODP as
> > > well.
> >
> > ODP is a lot simpler than NVMe for P2P actually :(
>
> What is your thinking there? I'm looking at the latest patches and I
> would expect dma_iova_init() to accept a phys so it can call
> pci_p2pdma_map_type() once for the whole transaction. It is a slow
> operation.
You can't do it for the whole transaction. Here is my suggestion
for ODP:
http://git.infradead.org/?p=users/hch/misc.git;a=shortlog;h=refs/heads/dma-split-wip
For NVMe I need to figure out a way to split bios on a per P2P
type boundary as we don't have any space to record if something is a bus
mapped address.
next prev parent reply other threads:[~2024-10-17 13:49 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-10-15 15:23 [PATCH v1 0/4] GPU Direct RDMA (P2P DMA) for Device Private Pages Yonatan Maman
2024-10-15 15:23 ` [PATCH v1 1/4] mm/hmm: HMM API for P2P DMA to device zone pages Yonatan Maman
2024-10-16 4:49 ` Christoph Hellwig
2024-10-16 15:04 ` Yonatan Maman
2024-10-16 15:44 ` Jason Gunthorpe
2024-10-16 16:41 ` Christoph Hellwig
2024-10-16 17:44 ` Jason Gunthorpe
2024-10-17 11:58 ` Christoph Hellwig
2024-10-17 13:05 ` Jason Gunthorpe
2024-10-17 13:12 ` Christoph Hellwig
2024-10-17 13:46 ` Jason Gunthorpe
2024-10-17 13:49 ` Christoph Hellwig [this message]
2024-10-17 14:05 ` Jason Gunthorpe
2024-10-17 14:19 ` Christoph Hellwig
2024-10-16 5:10 ` Alistair Popple
2024-10-16 15:45 ` Jason Gunthorpe
2024-10-17 1:58 ` Alistair Popple
2024-10-17 11:53 ` Jason Gunthorpe
2024-10-15 15:23 ` [PATCH v1 2/4] nouveau/dmem: HMM P2P DMA for private dev pages Yonatan Maman
2024-10-16 5:12 ` Alistair Popple
2024-10-16 15:18 ` Yonatan Maman
2024-10-15 15:23 ` [PATCH v1 3/4] IB/core: P2P DMA for device private pages Yonatan Maman
2024-10-15 15:23 ` [PATCH v1 4/4] RDMA/mlx5: Enabling ATS for ODP memory Yonatan Maman
2024-10-16 4:23 ` [PATCH v1 0/4] GPU Direct RDMA (P2P DMA) for Device Private Pages Christoph Hellwig
2024-10-16 15:16 ` Yonatan Maman
2024-10-16 22:22 ` Alistair Popple
2024-10-18 7:26 ` Zhu Yanjun
2024-10-20 15:26 ` Yonatan Maman
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