[PATCH v2 7/7] iommu: Turn iova_cookie to dma-iommu private pointer
Jason Gunthorpe
jgg at nvidia.com
Wed Feb 26 11:18:18 PST 2025
On Wed, Feb 26, 2025 at 10:57:00AM -0800, Nicolin Chen wrote:
> OK, I see. But we are also changing the behavior for the
> !CONFIG_IOMMU_DMA configuration, in which case all other iommu
> functions seem to return -ENODEV. And I assume we would need a
> justification for such a change?
>
> Perhaps, this can be explicit, just to keep the consistency:
> /* NOP if IOMMU driver reports SW_MSI reserved regions */
> return IS_ENABLED(CONFIG_IOMMU_DMA) ? 0 : -ENODEV;
Hurm, I donno, if we don't have a IRQ driver that supports it then it
doesn't matter that IOMMU_DMA is off either because there is nothing
that would call into IOMMU_DMA in the first place.
Success still seems like the right answer on such a weirdo kconfig.
Jason
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