From: Christoph Hellwig <hch@lst.de>
To: "Christian König" <christian.koenig@amd.com>
Cc: "Christoph Hellwig" <hch@lst.de>,
"Oded Gabbay" <oded.gabbay@gmail.com>,
"Jason Gunthorpe" <jgg@ziepe.ca>,
"Christian König" <ckoenig.leichtzumerken@gmail.com>,
"Gal Pressman" <galpress@amazon.com>,
sleybo@amazon.com, linux-rdma <linux-rdma@vger.kernel.org>,
"Oded Gabbay" <ogabbay@kernel.org>,
"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
dri-devel <dri-devel@lists.freedesktop.org>,
"moderated list:DMA BUFFER SHARING FRAMEWORK"
<linaro-mm-sig@lists.linaro.org>,
"Doug Ledford" <dledford@redhat.com>,
"Tomer Tayar" <ttayar@habana.ai>,
"amd-gfx list" <amd-gfx@lists.freedesktop.org>,
"Greg KH" <gregkh@linuxfoundation.org>,
"Alex Deucher" <alexander.deucher@amd.com>,
"Leon Romanovsky" <leonro@nvidia.com>,
"open list:DMA BUFFER SHARING FRAMEWORK"
<linux-media@vger.kernel.org>
Subject: Re: [Linaro-mm-sig] [PATCH v3 1/2] habanalabs: define uAPI to export FD for DMA-BUF
Date: Thu, 24 Jun 2021 15:22:23 +0200 [thread overview]
Message-ID: <20210624132223.GA22258@lst.de> (raw)
In-Reply-To: <899fe0ce-b6d7-c138-04b6-4b12405f8d93@amd.com>
On Thu, Jun 24, 2021 at 11:52:47AM +0200, Christian König wrote:
> I've already converted a bunch of the GPU drivers, but there are at least 6
> GPU still needing to be fixed and on top of that comes VA-API and a few
> others.
>
> What are your plans for the DMA mapping subsystem?
Building a new API that allows batched DMA mapping without the scatterlist.
The main input for my use case would be bio_vecs, but I plan to make it
a little flexible, and the output would be a list of [dma_addr,len]
tuples, with the API being flexible enough to just return a single
[dma_addr,len] for the common IOMMU coalescing case.
>
>> Btw, one thing I noticed when looking over the dma-buf instances is that
>> there is a lot of duplicated code for creating a sg_table from pages,
>> and then mapping it. It would be good if we could move toward common
>> helpers instead of duplicating that all over again.
>
> Can you give an example?
Take a look at the get_sg_table and put_sg_table helpers in udmabuf.
Those would also be useful in armda, i915, tegra, gntdev-dmabuf, mbochs
in one form or another.
Similar for variants that use a contigous regions.
WARNING: multiple messages have this Message-ID (diff)
From: Christoph Hellwig <hch@lst.de>
To: "Christian König" <christian.koenig@amd.com>
Cc: "Oded Gabbay" <oded.gabbay@gmail.com>,
linux-rdma <linux-rdma@vger.kernel.org>,
"Christian König" <ckoenig.leichtzumerken@gmail.com>,
sleybo@amazon.com, "Oded Gabbay" <ogabbay@kernel.org>,
"Gal Pressman" <galpress@amazon.com>,
dri-devel <dri-devel@lists.freedesktop.org>,
"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
"moderated list:DMA BUFFER SHARING FRAMEWORK"
<linaro-mm-sig@lists.linaro.org>,
"Jason Gunthorpe" <jgg@ziepe.ca>,
"Doug Ledford" <dledford@redhat.com>,
"Tomer Tayar" <ttayar@habana.ai>,
"amd-gfx list" <amd-gfx@lists.freedesktop.org>,
"Greg KH" <gregkh@linuxfoundation.org>,
"Alex Deucher" <alexander.deucher@amd.com>,
"Leon Romanovsky" <leonro@nvidia.com>,
"Christoph Hellwig" <hch@lst.de>,
"open list:DMA BUFFER SHARING FRAMEWORK"
<linux-media@vger.kernel.org>
Subject: Re: [Linaro-mm-sig] [PATCH v3 1/2] habanalabs: define uAPI to export FD for DMA-BUF
Date: Thu, 24 Jun 2021 15:22:23 +0200 [thread overview]
Message-ID: <20210624132223.GA22258@lst.de> (raw)
In-Reply-To: <899fe0ce-b6d7-c138-04b6-4b12405f8d93@amd.com>
On Thu, Jun 24, 2021 at 11:52:47AM +0200, Christian König wrote:
> I've already converted a bunch of the GPU drivers, but there are at least 6
> GPU still needing to be fixed and on top of that comes VA-API and a few
> others.
>
> What are your plans for the DMA mapping subsystem?
Building a new API that allows batched DMA mapping without the scatterlist.
The main input for my use case would be bio_vecs, but I plan to make it
a little flexible, and the output would be a list of [dma_addr,len]
tuples, with the API being flexible enough to just return a single
[dma_addr,len] for the common IOMMU coalescing case.
>
>> Btw, one thing I noticed when looking over the dma-buf instances is that
>> there is a lot of duplicated code for creating a sg_table from pages,
>> and then mapping it. It would be good if we could move toward common
>> helpers instead of duplicating that all over again.
>
> Can you give an example?
Take a look at the get_sg_table and put_sg_table helpers in udmabuf.
Those would also be useful in armda, i915, tegra, gntdev-dmabuf, mbochs
in one form or another.
Similar for variants that use a contigous regions.
_______________________________________________
amd-gfx mailing list
amd-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/amd-gfx
next prev parent reply other threads:[~2021-06-24 13:22 UTC|newest]
Thread overview: 143+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-18 12:36 [PATCH v3 1/2] habanalabs: define uAPI to export FD for DMA-BUF Oded Gabbay
2021-06-18 12:36 ` Oded Gabbay
2021-06-18 12:36 ` [PATCH v3 2/2] habanalabs: add support for dma-buf exporter Oded Gabbay
2021-06-18 12:36 ` Oded Gabbay
2021-06-21 12:28 ` [PATCH v3 1/2] habanalabs: define uAPI to export FD for DMA-BUF Daniel Vetter
2021-06-21 12:28 ` Daniel Vetter
2021-06-21 12:28 ` Daniel Vetter
2021-06-21 13:02 ` Greg KH
2021-06-21 13:02 ` Greg KH
2021-06-21 13:02 ` Greg KH
2021-06-21 14:12 ` Jason Gunthorpe
2021-06-21 14:12 ` Jason Gunthorpe
2021-06-21 14:12 ` Jason Gunthorpe
2021-06-21 16:26 ` Oded Gabbay
2021-06-21 16:26 ` Oded Gabbay
2021-06-21 16:26 ` Oded Gabbay
2021-06-21 17:55 ` Jason Gunthorpe
2021-06-21 17:55 ` Jason Gunthorpe
2021-06-21 17:55 ` Jason Gunthorpe
2021-06-21 18:27 ` Daniel Vetter
2021-06-21 18:27 ` Daniel Vetter
2021-06-21 18:27 ` Daniel Vetter
2021-06-21 19:24 ` Oded Gabbay
2021-06-21 19:24 ` Oded Gabbay
2021-06-21 19:24 ` Oded Gabbay
2021-06-21 23:29 ` Jason Gunthorpe
2021-06-21 23:29 ` Jason Gunthorpe
2021-06-21 23:29 ` Jason Gunthorpe
2021-06-22 6:37 ` [Linaro-mm-sig] " Christian König
2021-06-22 6:37 ` Christian König
2021-06-22 6:37 ` Christian König
2021-06-22 8:42 ` Oded Gabbay
2021-06-22 8:42 ` Oded Gabbay
2021-06-22 8:42 ` Oded Gabbay
2021-06-22 12:01 ` Jason Gunthorpe
2021-06-22 12:01 ` Jason Gunthorpe
2021-06-22 12:01 ` Jason Gunthorpe
2021-06-22 12:04 ` Oded Gabbay
2021-06-22 12:04 ` Oded Gabbay
2021-06-22 12:04 ` Oded Gabbay
2021-06-22 12:15 ` Jason Gunthorpe
2021-06-22 12:15 ` Jason Gunthorpe
2021-06-22 12:15 ` Jason Gunthorpe
2021-06-22 13:12 ` Oded Gabbay
2021-06-22 13:12 ` Oded Gabbay
2021-06-22 13:12 ` Oded Gabbay
2021-06-22 15:11 ` Jason Gunthorpe
2021-06-22 15:11 ` Jason Gunthorpe
2021-06-22 15:11 ` Jason Gunthorpe
2021-06-22 15:24 ` Christian König
2021-06-22 15:24 ` Christian König
2021-06-22 15:24 ` Christian König
2021-06-22 15:28 ` Jason Gunthorpe
2021-06-22 15:28 ` Jason Gunthorpe
2021-06-22 15:28 ` Jason Gunthorpe
2021-06-22 15:31 ` Oded Gabbay
2021-06-22 15:31 ` Oded Gabbay
2021-06-22 15:31 ` Oded Gabbay
2021-06-22 15:31 ` Christian König
2021-06-22 15:31 ` Christian König
2021-06-22 15:31 ` Christian König
2021-06-22 15:40 ` Oded Gabbay
2021-06-22 15:40 ` Oded Gabbay
2021-06-22 15:40 ` Oded Gabbay
2021-06-22 15:49 ` Christian König
2021-06-22 15:49 ` Christian König
2021-06-22 15:49 ` Christian König
2021-06-22 15:24 ` Oded Gabbay
2021-06-22 15:24 ` Oded Gabbay
2021-06-22 15:24 ` Oded Gabbay
2021-06-22 15:34 ` Jason Gunthorpe
2021-06-22 15:34 ` Jason Gunthorpe
2021-06-22 15:34 ` Jason Gunthorpe
2021-06-22 12:23 ` Christian König
2021-06-22 12:23 ` Christian König
2021-06-22 12:23 ` Christian König
2021-06-22 15:23 ` Jason Gunthorpe
2021-06-22 15:23 ` Jason Gunthorpe
2021-06-22 15:23 ` Jason Gunthorpe
2021-06-22 15:29 ` Christian König
2021-06-22 15:29 ` Christian König
2021-06-22 15:29 ` Christian König
2021-06-22 15:40 ` Jason Gunthorpe
2021-06-22 15:40 ` Jason Gunthorpe
2021-06-22 15:40 ` Jason Gunthorpe
2021-06-22 15:48 ` Christian König
2021-06-22 15:48 ` Christian König
2021-06-22 15:48 ` Christian König
2021-06-22 16:05 ` Jason Gunthorpe
2021-06-22 16:05 ` Jason Gunthorpe
2021-06-22 16:05 ` Jason Gunthorpe
2021-06-23 8:57 ` Christian König
2021-06-23 8:57 ` Christian König
2021-06-23 8:57 ` Christian König
2021-06-23 9:14 ` Oded Gabbay
2021-06-23 9:14 ` Oded Gabbay
2021-06-23 9:14 ` Oded Gabbay
2021-06-23 18:24 ` Jason Gunthorpe
2021-06-23 18:24 ` Jason Gunthorpe
2021-06-23 18:24 ` Jason Gunthorpe
2021-06-23 18:43 ` Oded Gabbay
2021-06-23 18:43 ` Oded Gabbay
2021-06-23 18:43 ` Oded Gabbay
2021-06-23 18:50 ` Jason Gunthorpe
2021-06-23 18:50 ` Jason Gunthorpe
2021-06-23 18:50 ` Jason Gunthorpe
2021-06-23 19:00 ` Oded Gabbay
2021-06-23 19:00 ` Oded Gabbay
2021-06-23 19:00 ` Oded Gabbay
2021-06-23 19:34 ` Jason Gunthorpe
2021-06-23 19:34 ` Jason Gunthorpe
2021-06-23 19:34 ` Jason Gunthorpe
2021-06-23 19:39 ` Oded Gabbay
2021-06-23 19:39 ` Oded Gabbay
2021-06-23 19:39 ` Oded Gabbay
2021-06-24 0:45 ` Jason Gunthorpe
2021-06-24 0:45 ` Jason Gunthorpe
2021-06-24 0:45 ` Jason Gunthorpe
2021-06-24 5:40 ` Christoph Hellwig
2021-06-24 5:40 ` Christoph Hellwig
2021-06-24 5:34 ` Christoph Hellwig
2021-06-24 5:34 ` Christoph Hellwig
2021-06-24 8:07 ` Christian König
2021-06-24 8:07 ` Christian König
2021-06-24 8:07 ` Christian König
2021-06-24 8:12 ` Christoph Hellwig
2021-06-24 8:12 ` Christoph Hellwig
2021-06-24 9:52 ` Christian König
2021-06-24 9:52 ` Christian König
2021-06-24 9:52 ` Christian König
2021-06-24 13:22 ` Christoph Hellwig [this message]
2021-06-24 13:22 ` Christoph Hellwig
2021-06-22 16:50 ` Felix Kuehling
2021-06-22 16:50 ` Felix Kuehling
2021-06-22 16:50 ` Felix Kuehling
2021-06-21 14:20 ` Daniel Vetter
2021-06-21 14:20 ` Daniel Vetter
2021-06-21 14:20 ` Daniel Vetter
2021-06-21 14:49 ` Jason Gunthorpe
2021-06-21 14:49 ` Jason Gunthorpe
2021-06-21 14:17 ` Jason Gunthorpe
2021-06-21 14:17 ` Jason Gunthorpe
2021-06-21 14:17 ` Jason Gunthorpe
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