Messages in this thread | | | Date | Mon, 27 Aug 2018 00:07:31 -0700 | From | Christoph Hellwig <> | Subject | Re: [PATCH] Changing the AMD IOMMU API path to work in an atomic context which is necessary for any custom drivers using the IOMMU API while holding a spinlock. |
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On Fri, Aug 24, 2018 at 11:55:53PM +0100, Tom Murphy wrote: > We were going to do this by using the iommu-dma api and replacing all the > existing calls to the DMA api functions in the amd driver with their > iommu-dma equivalent like in this driver: > https://elixir.bootlin.com/linux/latest/source/arch/arm64/mm/dma-mapping.c#L810
FYI, I have a a wip branch to move the arm64 wrappers for both swiotlb and dma-iommu here:
http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/dma-maybe-coherent
Maybe you could try to base on top of that.
> To do this we need the map/unmap callbacks to be spinlock-safe.
You probably want to send the patch together with the one(s) making use of it.
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