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| author | Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com> | 2022-06-02 21:23:51 +0200 |
|---|---|---|
| committer | Juergen Gross <jgross@suse.com> | 2022-06-06 16:07:30 +0200 |
| commit | 1ca55d50e50c74747a7b8846dac306fbe5ac4cf5 (patch) | |
| tree | b65bbd049e63b1bb0cd6850586c2b63e8521e3ca /drivers/xen/Makefile | |
| parent | dt-bindings: Add xen,grant-dma IOMMU description for xen-grant DMA ops (diff) | |
| download | linux-1ca55d50e50c74747a7b8846dac306fbe5ac4cf5.tar.xz linux-1ca55d50e50c74747a7b8846dac306fbe5ac4cf5.zip | |
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>
Diffstat (limited to 'drivers/xen/Makefile')
| -rw-r--r-- | drivers/xen/Makefile | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/xen/Makefile b/drivers/xen/Makefile index 1a23cb0dc188..c0503f1c7d5b 100644 --- a/drivers/xen/Makefile +++ b/drivers/xen/Makefile @@ -40,3 +40,4 @@ xen-privcmd-y := privcmd.o privcmd-buf.o obj-$(CONFIG_XEN_FRONT_PGDIR_SHBUF) += xen-front-pgdir-shbuf.o obj-$(CONFIG_XEN_UNPOPULATED_ALLOC) += unpopulated-alloc.o obj-$(CONFIG_XEN_GRANT_DMA_OPS) += grant-dma-ops.o +obj-$(CONFIG_XEN_GRANT_DMA_IOMMU) += grant-dma-iommu.o |