On Thu, Apr 18, 2024 at 06:52:13AM -0700, mhkelley58@xxxxxxxxx wrote: > There's currently no documentation for the swiotlb. Add documentation > describing usage scenarios, the key APIs, and implementation details. > Group the new documentation with other DMA-related documentation. This is really well written. Thank you. One minor nit below. > +Usage Scenarios > +--------------- > +The swiotlb was originally created to handle DMA for devices > +with addressing limitations. As physical memory sizes grew > +beyond 4 Gbytes, some devices could only provide 32-bit DMA > +addresses. By allocating bounce buffer memory below the 4 Gbyte I'd prefer GiB to Gbytes; we might also prefer GB, Gigabyte or Gibibyte, but Gbytes seems wrong. You've written a lot here, and I'm not an expert on swiommu, but nothing else leapt out at me.
