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authorOleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>2022-06-02 22:23:51 +0300
committerJuergen Gross <jgross@suse.com>2022-06-06 17:07:30 +0300
commit1ca55d50e50c74747a7b8846dac306fbe5ac4cf5 (patch)
treeb65bbd049e63b1bb0cd6850586c2b63e8521e3ca /include/xen
parentadd413a1d966d8458571a2571881903d234a9f8e (diff)
downloadlinux-1ca55d50e50c74747a7b8846dac306fbe5ac4cf5.tar.xz
xen/grant-dma-iommu: Introduce stub IOMMU driver
In order to reuse generic IOMMU device tree bindings by Xen grant DMA-mapping layer we need to add this stub driver from a fw_devlink perspective (grant-dma-ops cannot be converted into the proper IOMMU driver). Otherwise, just reusing IOMMU bindings (without having a corresponding driver) leads to the deferred probe timeout afterwards, because the IOMMU device never becomes available. This stub driver does nothing except registering empty iommu_ops, the upper layer "of_iommu" will treat this as NO_IOMMU condition and won't return -EPROBE_DEFER. As this driver is quite different from the most hardware IOMMU implementations and only needed in Xen guests, place it in drivers/xen directory. The subsequent commit will make use of it. Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com> Reviewed-by: Stefano Stabellini <sstabellini@kernel.org> Link: https://lore.kernel.org/r/1654197833-25362-7-git-send-email-olekstysh@gmail.com Signed-off-by: Juergen Gross <jgross@suse.com>
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