On 08.07.2025 14:56, Marek Szyprowski wrote: > On 08.07.2025 14:06, Leon Romanovsky wrote: >> On Tue, Jul 08, 2025 at 01:45:20PM +0200, Marek Szyprowski wrote: >>> On 08.07.2025 13:00, Leon Romanovsky wrote: >>>> On Tue, Jul 08, 2025 at 12:27:09PM +0200, Marek Szyprowski wrote: >>>>> On 30.06.2025 15:38, Christoph Hellwig wrote: >>>>>> On Fri, Jun 27, 2025 at 08:02:13PM +0300, Leon Romanovsky wrote: >>>>>>>> Thanks for this rework! I assume that the next step is to add >>>>>>>> map_phys >>>>>>>> callback also to the dma_map_ops and teach various dma-mapping >>>>>>>> providers >>>>>>>> to use it to avoid more phys-to-page-to-phys conversions. >>>>>>> Probably Christoph will say yes, however I personally don't see any >>>>>>> benefit in this. Maybe I wrong here, but all existing .map_page() >>>>>>> implementation platforms don't support p2p anyway. They won't >>>>>>> benefit >>>>>>> from this such conversion. >>>>>> I think that conversion should eventually happen, and rather >>>>>> sooner than >>>>>> later. >>>>> Agreed. >>>>> >>>>> Applied patches 1-7 to my dma-mapping-next branch. Let me know if one >>>>> needs a stable branch with it. >>>> Thanks a lot, I don't think that stable branch is needed. >>>> Realistically >>>> speaking, my VFIO DMA work won't be merged this cycle, We are in -rc5, >>>> it is complete rewrite from RFC version and touches pci-p2p code (to >>>> remove dependency on struct page) in addition to VFIO, so it will take >>>> time. >>>> >>>> Regarding, last patch (hmm), it will be great if you can take it. >>>> We didn't touch anything in hmm.c this cycle and have no plans to >>>> send PR. >>>> It can safely go through your tree. >>> Okay, then I would like to get an explicit ack from Jérôme for this. >> Jerome is not active in HMM world for a long time already. >> HMM tree is managed by us (RDMA) >> https://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma.git/log/?h=hmm >> ➜ kernel git:(m/dmabuf-vfio) git log --merges mm/hmm.c >> ... >> Pull HMM updates from Jason Gunthorpe: >> ... >> >> https://web.git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=58ba80c4740212c29a1cf9b48f588e60a7612209 >> >> >> +hmm git >> git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma.git#hmm >> >> We just never bothered to reflect current situation in MAINTAINERS file. > > Maybe this is the time to update it :) > > I was just a bit confused that no-one commented the HMM patch, but if > You maintain it, then this is okay.
I've applied the last patch to dma-mapping-for-next branch. Best regards -- Marek Szyprowski, PhD Samsung R&D Institute Poland
