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Tsirkin" , Jason Wang , Xuan Zhuo , =?UTF-8?Q?Eugenio_P=C3=A9rez?= , Alexander Potapenko , Marco Elver , Dmitry Vyukov , Masami Hiramatsu , Mathieu Desnoyers , =?UTF-8?B?SsOpcsO0bWUgR2xpc3Nl?= , Andrew Morton , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, iommu@lists.linux.dev, virtualization@lists.linux.dev, kasan-dev@googlegroups.com, linux-trace-kernel@vger.kernel.org, linux-mm@kvack.org, Jason Gunthorpe Content-Language: en-US From: Marek Szyprowski In-Reply-To: <20250630133839.GA26981@lst.de> Content-Transfer-Encoding: 7bit X-CMS-MailID: 20250708102712eucas1p1199b906d3c40b7ff5066a92aacd7b14c X-Msg-Generator: CA Content-Type: text/plain; charset="utf-8" X-RootMTR: 20250625131920eucas1p271b196cde042bd39ac08fb12beff5baf X-EPHeader: CA X-CMS-RootMailID: 20250625131920eucas1p271b196cde042bd39ac08fb12beff5baf References: <35df6f2a-0010-41fe-b490-f52693fe4778@samsung.com> <20250627170213.GL17401@unreal> <20250630133839.GA26981@lst.de> X-Stat-Signature: k4yroaidmeycn6we7nozrihfa58c8wqc X-Rspamd-Queue-Id: 1971F18000D X-Rspamd-Server: rspam11 X-Rspam-User: X-HE-Tag: 1751970434-655390 X-HE-Meta: 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 pa7yD4Ce EZt8eOX8/UeEj/Bhi0GRV0K5tBBjNc7+0h5QZLQMzOux4n6inaFvA+UgGKZwnSwD9uMgfdOr1ehyRlEMN2JNvziBBfHGfUHTNmTCqGAKRka6dzKkfl5q4VANuc+IRRgR7k5vZ 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 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. Leon, it would be great if You could also prepare an incremental patch adding map_phys callback to the dma_maps_ops, so the individual arch-specific dma-mapping providers can be then converted (or simplified in many cases) too. Best regards -- Marek Szyprowski, PhD Samsung R&D Institute Poland