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Jason Gunthorpe
cfea71aea9
SMMUv3 co-mingles FEAT_IOPF and FEAT_SVA behaviors so that fault reporting doesn't work unless both are enabled. This is not correct and causes problems for iommufd which does not enable FEAT_SVA for it's fault capable domains. These APIs are both obsolete, update SMMUv3 to use the new method like AMD implements. A driver should enable iopf support when a domain with an iopf_handler is attached, and disable iopf support when the domain is removed. Move the fault support logic to sva domain allocation and to domain attach, refusing to create or attach fault capable domains if the HW doesn't support it. Move all the logic for controlling the iopf queue under arm_smmu_attach_prepare(). Keep track of the number of domains on the master (over all the SSIDs) that require iopf. When the first domain requiring iopf is attached create the iopf queue, when the last domain is detached destroy it. Turn FEAT_IOPF and FEAT_SVA into no ops. Remove the sva_lock, this is all protected by the group mutex. Signed-off-by: Jason Gunthorpe <jgg@nvidia.com> Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com> Tested-by: Zhangfei Gao <zhangfei.gao@linaro.org> Acked-by: Will Deacon <will@kernel.org> Link: https://lore.kernel.org/r/20250418080130.1844424-2-baolu.lu@linux.intel.com Signed-off-by: Joerg Roedel <jroedel@suse.de>
Linux kernel
============
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