iommu/arm-smmu: Support SMMU module probing from the IORT

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Add support for SMMU drivers built as modules to the ACPI/IORT device
probing path, by deferring the probe of the master if the SMMU driver is
known to exist but has not been loaded yet. Given that the IORT code
registers a platform device for each SMMU that it discovers, we can
easily trigger the udev based autoloading of the SMMU drivers by making
the platform device identifier part of the module alias.

Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Tested-by: John Garry <john.garry@huawei.com> # only manual smmu ko loading
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Will Deacon <will@kernel.org>
Tested-by: John Garry <john.garry@huawei.com> # smmu v3
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

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This commit is contained in:

Ard Biesheuvel 2019-12-19 12:03:48 +00:00 • committed by Joerg Roedel

parent ab24677471

commit d3daf66621

3 changed files with 4 additions and 2 deletions

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4

drivers/acpi/arm64/iort.c

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1

drivers/iommu/arm-smmu-v3.c

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1

drivers/iommu/arm-smmu.c

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