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Now that we can properly describe the mapping between PCI RIDs and
stream IDs via "iommu-map", and have it fed it to the driver
automatically via of_xlate(), rework the SMMUv3 driver to benefit from
that, and get rid of the current misuse of the "iommus" binding.
Since having of_xlate wired up means that masters will now be given the
appropriate DMA ops, we also need to make sure that default domains work
properly. This necessitates dispensing with the "whole group at a time"
notion for attaching to a domain, as devices which share a group get
attached to the group's default domain one by one as they are initially
probed.
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
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Unlike SMMUv2, SMMUv3 has no easy way to bypass unknown stream IDs,
other than allocating and filling in the entire stream table with bypass
entries, which for some configurations would waste *gigabytes* of RAM.
Otherwise, all transactions on unknown stream IDs will simply be aborted
with a C_BAD_STREAMID event.
Rather than render the system unusable in the case of an invalid DT,
avoid enabling the SMMU altogether such that everything bypasses
(though letting the explicit disable_bypass option take precedence).
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
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We're about to ratify our use of the generic binding, so document it.
CC: Rob Herring <robh+dt@kernel.org>
CC: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
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Introduce a common structure to hold the per-device firmware data that
most IOMMU drivers need to keep track of. This enables us to configure
much of that data from common firmware code, and consolidate a lot of
the equivalent implementations, device look-up tables, etc. which are
currently strewn across IOMMU drivers.
This will also be enable us to address the outstanding "multiple IOMMUs
on the platform bus" problem by tweaking IOMMU API calls to prefer
dev->fwspec->ops before falling back to dev->bus->iommu_ops, and thus
gracefully handle those troublesome systems which we currently cannot.
As the first user, hook up the OF IOMMU configuration mechanism. The
driver-defined nature of DT cells means that we still need the drivers
to translate and add the IDs themselves, but future users such as the
much less free-form ACPI IORT will be much simpler and self-contained.
CC: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Suggested-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
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Now that we have a way to pick up the RID translation and target IOMMU,
hook up of_iommu_configure() to bring PCI devices into the of_xlate
mechanism and allow them IOMMU-backed DMA ops without the need for
driver-specific handling.
Reviewed-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
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The PCI msi-map code is already doing double-duty translating IDs and
retrieving MSI parents, which unsurprisingly is the same functionality
we need for the identically-formatted PCI iommu-map property. Drag the
core parsing routine up yet another layer into the general OF-PCI code,
and further generalise it for either kind of lookup in either flavour
of map property.
Acked-by: Rob Herring <robh+dt@kernel.org>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Tested-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
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Robin Murphy