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Morton , Bjorn Helgaas , Christian =?utf-8?B?S8O2bmln?= , dri-devel@lists.freedesktop.org, iommu@lists.linux.dev, Jens Axboe , Joerg Roedel , kvm@vger.kernel.org, linaro-mm-sig@lists.linaro.org, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, linux-mm@kvack.org, linux-pci@vger.kernel.org, Logan Gunthorpe , Marek Szyprowski , Robin Murphy , Sumit Semwal , Vivek Kasireddy , Will Deacon Subject: Re: [PATCH v5 4/9] PCI/P2PDMA: Export pci_p2pdma_map_type() function Message-ID: <20251020131417.GN316284@nvidia.com> References: <0fa715706e1adf5e26199dc3eaa3b1ff3b14db67.1760368250.git.leon@kernel.org> <20251017121447.GH3901471@nvidia.com> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-ClientProxiedBy: SA9PR13CA0093.namprd13.prod.outlook.com (2603:10b6:806:24::8) To MN2PR12MB3613.namprd12.prod.outlook.com (2603:10b6:208:c1::17) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Mon, Oct 20, 2025 at 05:29:06AM -0700, Christoph Hellwig wrote: > On Fri, Oct 17, 2025 at 09:14:47AM -0300, Jason Gunthorpe wrote: > > On Thu, Oct 16, 2025 at 11:31:53PM -0700, Christoph Hellwig wrote: > > > > > > Nacked-by: Christoph Hellwig > > > > > > As explained to you multiple times, pci_p2pdma_map_type is a low-level > > > helper that absolutely MUST be wrapper in proper accessors. > > > > You never responded to the discussion: > > > > https://lore.kernel.org/all/20250727190252.GF7551@nvidia.com/ > > > > What is the plan here? Is the new DMA API unusable by modules? That > > seems a little challenging. > > Yes. These are only intended to be wrapped by subsystems. Sure, but many subsystems are fully modular too.. RDMA for example. Well, lets see what comes in the future.. > Yes, that sounds much better. And dmabuf in general could use some > deduplicating of their dma mapping patterns (and eventual fixing). Yes, it certainly could, but I wanted to tackle this later.. I think adding some 'dmabuf create a map for this list of phys on this provider' is a good simplifed primitive. Simple drivers like VFIO that only want to expose MMIO can just call it directly. Once this is settled I want to have RDMA wrap some of its MMIO VMAs in DMABUF as well, so I can see at least two users of the helper. Jason