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iommu/arm-smmu: Report USF more clearly
Although CONFIG_ARM_SMMU_DISABLE_BYPASS_BY_DEFAULT is a welcome tool for smoking out inadequate firmware, the failure mode is non-obvious and can be confusing for end users. Add some special-case reporting of Unidentified Stream Faults to help clarify this particular symptom. Since we're adding yet another print to the mix, also break out an explicit ratelimit state to make sure everything stays together (and reduce the static storage footprint a little). Reviewed-by: Douglas Anderson <dianders@chromium.org> Signed-off-by: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Will Deacon <will@kernel.org>
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