Re: [PATCH] iommu/dma: Respect SWIOTLB force_bounce

[Christoph Hellwig]

On Wed, May 01, 2024 at 08:13:18PM +0000, T.J. Mercier wrote:
> iommu_dma_map_page and iommu_dma_map_sg conditionally use SWIOTLB, but
> checking if force_bounce is set for the device is not part of that
> condition. Check if devices have requested to force SWIOTLB use as part
> of deciding to take the existing SWIOTLB paths.

This fails to explain why you'd want this somewhat surprising behavior,
and why you consider it a bug fix.