On Wed, 3 Feb 2021 at 02:02, Robin Murphy <robin.murphy@xxxxxxx> wrote: > > On 2021-02-02 14:41, Joerg Roedel wrote: > > On Tue, Feb 02, 2021 at 02:34:34PM +0000, Robin Murphy wrote: > >> Nope, I believe if Arm Ltd. had any involvement in this I'd know about it :) > > > > Okay, got confused by thinking of ARM as the CPU architecture, not the > > company :) > > But given the intel/ and amd/ subdirectories refer to company names as > > well, the same is true for arm/. > > Right, trying to group IOMMU drivers by supposed CPU architecture is > already a demonstrable non-starter; does intel-iommu count as x86, or > IA-64, or do you want two copies? :P > > I somehow doubt anyone would license one of Arm's SMMUs to go in a > RISC-V/MIPS/etc. based SoC, but in principle, they *could*. In fact it's > precisely cases like this one - where silicon vendors come up with their > own little scatter-gather unit to go with their own display controller > etc. - that I imagine are most likely to get reused if the vendor > decides to experiment with different CPUs to reach new market segments. Yes, I agree, I believe this iommu unit along with Unisoc's multi-media modules can be used on other architecture SoCs, not only ARM based. > > Robin.
