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iommu: Streamline iommu_iova_to_phys()

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If people are going to insist on calling iommu_iova_to_phys()
pointlessly and expecting it to work, we can at least do ourselves a
favour by handling those cases in the core code, rather than repeatedly
across an inconsistent handful of drivers.

Since all the existing drivers implement the internal callback, and any
future ones are likely to want to work with iommu-dma which relies on
iova_to_phys a fair bit, we may as well remove that currently-redundant
check as well and consider it mandatory.

Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/f564f3f6ff731b898ff7a898919bf871c2c7745a.1626354264.git.robin.murphy@arm.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Robin Murphy
2021-07-15 14:04:24 +01:00
committed by Joerg Roedel
parent 308723e358
commit 13b6eb6e1c
4 changed files with 4 additions and 10 deletions
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3
drivers/iommu/arm/arm-smmu/arm-smmu.c
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@@ -1322,9 +1322,6 @@ static phys_addr_t arm_smmu_iova_to_phys(struct iommu_domain *domain,
struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
struct io_pgtable_ops *ops = smmu_domain->pgtbl_ops;
if (domain->type == IOMMU_DOMAIN_IDENTITY)
return iova;
if (!ops)
return 0;