linux-kernel - implement generic dma_map

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Message-Id: <20190430105214.24628-1-hch@lst.de>
Date:   Tue, 30 Apr 2019 06:51:49 -0400
From:   Christoph Hellwig <hch@....de>
To:     Robin Murphy <robin.murphy@....com>
Cc:     Joerg Roedel <joro@...tes.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Tom Lendacky <thomas.lendacky@....com>,
        iommu@...ts.linux-foundation.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: implement generic dma_map_ops for IOMMUs v4

Hi Robin,

please take a look at this series, which implements a completely generic
set of dma_map_ops for IOMMU drivers.  This is done by taking the
existing arm64 code, moving it to drivers/iommu and then massaging it
so that it can also work for architectures with DMA remapping.  This
should help future ports to support IOMMUs more easily, and also allow
to remove various custom IOMMU dma_map_ops implementations, like Tom
was planning to for the AMD one.

A git tree is also available at:

    git://git.infradead.org/users/hch/misc.git dma-iommu-ops.3

Gitweb:

    http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/dma-iommu-ops.3

Changes since v3:
 - fold the separate patch to refactor mmap bounds checking
 - don't warn on not finding a vm_area
 - improve a commit log
 - refactor __dma_iommu_free a little differently
 - remove a minor MSI map cleanup to avoid a conflict with the
   "Split iommu_dma_map_msi_msg" series

Changes since v2:
 - address various review comments and include patches from Robin

Changes since v1:
 - only include other headers in dma-iommu.h if CONFIG_DMA_IOMMU is enabled
 - keep using a scatterlist in iommu_dma_alloc
 - split out mmap/sgtable fixes and move them early in the series
 - updated a few commit logs