Re: [PATCH 0/3] fix GART to respect device's dma_mask aboutvirtual mappings

From: Ingo Molnar
Date: Sun Sep 14 2008 - 10:45:33 EST



* FUJITA Tomonori <fujita.tomonori@xxxxxxxxxxxxx> wrote:

> Currently, gart IOMMU ignores device's dma_mask when it does virtual
> mappings. So it could give a device a virtual address that the device
> can't access to.
>
> Some IOMMUs, in x86 IOMMUs GART and Calgary, have this issue. This
> patchset fixes GART.
>
> The first and second patches add helper functions, useful for some
> IOMMUs (both are taken from POWER IOMMU code). I'll convert some
> IOMMUs to use the functions after they are merged into mainline (to
> avoid complicated dependence on multiple trees).
>
> This is against tip/x86/iommu plus a patch that I sent yesterday:
>
> http://lkml.org/lkml/2008/9/11/147.

applied them to tip/x86/iommu:

bee44f2: x86: make GART to respect device's dma_mask about virtual mappings
589fc9a: iommu: add dma_get_mask helper function
eecfffc: iommu: add iommu_device_max_index IOMMU helper function

thanks!

Ingo
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