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iommu: Implement common IOMMU ops for DMA mapping

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Taking inspiration from the existing arch/arm code, break out some
generic functions to interface the DMA-API to the IOMMU-API. This will
do the bulk of the heavy lifting for IOMMU-backed dma-mapping.

Since associating an IOVA allocator with an IOMMU domain is a fairly
common need, rather than introduce yet another private structure just to
do this for ourselves, extend the top-level struct iommu_domain with the
notion. A simple opaque cookie allows reuse by other IOMMU API users
with their various different incompatible allocator types.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Robin Murphy 2015-10-01 20:13:58 +01:00 • committed by Joerg Roedel
parent 25cb62b764
commit 0db2e5d18f
5 changed files with 618 additions and 0 deletions
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1
include/linux/iommu.h
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@ -81,6 +81,7 @@ struct iommu_domain {
iommu_fault_handler_t handler;
void *handler_token;
struct iommu_domain_geometry geometry;
void *iova_cookie;
};
enum iommu_cap {