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See http://www.infradead.org/rpr.html X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-samsung-soc , Jan Kara , Pawel Osciak , KVM list , Linux MM , John Hubbard , LKML , DRI Development , Tomasz Figa , Jason Gunthorpe , J??r??me Glisse , "open list:DMA BUFFER SHARING FRAMEWORK" , Daniel Vetter , Kyungmin Park , Andrew Morton , Mauro Carvalho Chehab , Dan Williams , Linux ARM , Marek Szyprowski Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, Nov 04, 2020 at 04:54:19PM +0100, Daniel Vetter wrote: > I don't really have a box here, but dma_mmap_attrs() and friends to > mmap dma_alloc_coherent memory is set up as VM_IO | VM_PFNMAP (it's > actually enforced since underneath it uses remap_pfn_range), and > usually (except if it's pre-cma carveout) that's just normal struct > page backed memory. Sometimes from a cma region (so will be caught by > the cma page check), but if you have an iommu to make it > device-contiguous, that's not needed. dma_mmap_* memory may or may not be page backed, but it absolutely must not be resolved by get_user_pages and friends as it is special. So yes, not being able to get a struct page back from such an mmap is a feature. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel