tree 2498b0d9666a2d8abec99731efc42cc42039bd31
parent 95fa99aa402ad516ec825057a168f395ece39a2e
author Robin Murphy <robin.murphy@arm.com> 1473696828 +0100
committer Will Deacon <will.deacon@arm.com> 1474014858 +0100

iommu/arm-smmu: Handle stream IDs more dynamically

Rather than assuming fixed worst-case values for stream IDs and SMR
masks, keep track of whatever implemented bits the hardware actually
reports. This also obviates the slightly questionable validation of SMR
fields in isolation - rather than aborting the whole SMMU probe for a
hardware configuration which is still architecturally valid, we can
simply refuse masters later if they try to claim an unrepresentable ID
or mask (which almost certainly implies a DT error anyway).

Acked-by: Will Deacon <will.deacon@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>