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iommu/arm-smmu-v3: Add CFGI/TLBI-repeat workaround

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Tegra264 SMMU instances need every CFGI/TLBI command sequence issued
twice, with the second issue executing only after the first issue's
CMD_SYNC has completed:

    TLBI/CFGI ... CMD_SYNC TLBI/CFGI ... CMD_SYNC

ATC_INV is not affected and must never be doubled.

Add arm_smmu_erratum_repeat_tlbi_cfgi_key and a file-local
arm_smmu_erratum_cmd_needs_repeating() helper that gates on the static
key first and then range-checks the opcode (CFGI_STE .. ATC_INV).

Rename the existing arm_smmu_cmdq_issue_cmdlist() to
__arm_smmu_cmdq_issue_cmdlist() and add a thin wrapper of the original
name that re-issues the same cmdlist a second time when the predicate
fires. Register the new condition with
arm_smmu_cmdq_batch_force_sync() too.

No callers enable the static key yet, so there is no functional change.
A subsequent change will enable the key on affected instances.

Suggested-by: Nicolin Chen <nicolinc@nvidia.com>
Reviewed-by: Nicolin Chen <nicolinc@nvidia.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Ashish Mhetre <amhetre@nvidia.com>
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Ashish Mhetre 2026-07-26 08:19:02 +00:00 • committed by Will Deacon
commit 95ed2da202
2 changed files with 57 additions and 4 deletions
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