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https://lwn.net/Articles/493077/
Apr 18, 2012 · So hopefully this is good enough, since + adding interfaces to intercept pagefaults and allow pte shootdowns would + increase the complexity quite a bit. + + Interface: + int dma_buf_mmap(struct dma_buf *, struct vm_area_struct *, + unsigned long); + + If the importing subsystem simply provides a special-purpose mmap call to set + up a mapping ...
https://github.com/MWisBest/android_kernel_samsung_tuna/commit/661d99011cfc5e1672ab88546bcc0193e5bbfd7e
In case we ever want to add support for explicitly cache maneged userspace mmap with a prepare/finish ioctl pair, we could specify that userspace needs to mmap a different part of the dma_buf, e.g. the range starting at dma_buf->size up to dma_buf->size*2. This works …
https://www.kernel.org/doc/html/v4.16/driver-api/dma-buf.html
int dma_buf_mmap(struct dma_buf *, struct vm_area_struct *, unsigned long); If the importing subsystem simply provides a special-purpose mmap call to set up a mapping in userspace, calling do_mmap with dma_buf->file will equally achieve that for a dma-buf object.
https://www.kernel.org/doc/html/v4.10/driver-api/dma-buf.html
Buffer Sharing and Synchronization¶ The dma-buf subsystem provides the framework for sharing buffers for hardware (DMA) access across multiple device drivers and subsystems, and for synchronizing asynchronous hardware access. This is used, for example, by drm “prime” multi-GPU support, but is of course not limited to GPU use cases.
https://github.com/ikwzm/udmabuf
Jan 17, 2018 · udmabuf(User space mappable DMA Buffer) Overview Introduction of udmabuf. udmabuf is a Linux device driver that allocates contiguous memory blocks in the kernel space as DMA buffers and makes them available from the user space.
https://git.congatec.com/arm/qmx6_kernel/commit/4c78513e457f72d5554a0f6e2eabfad7b98e4f19
dma-buf: mmap support Compared to Rob Clark's RFC I've ditched the prepare/finish hooks and corresponding ioctls on the dma_buf file. The major reason for that is that many people seem to be under the impression that this is also for synchronization with outstanding asynchronous processsing.
https://e2e.ti.com/support/processors/f/791/t/516075
I've successfully configured the AM57XX's VPE to output BGRA32 format images. It is in streaming mode and queuing and dequeuing frames just fine. I want to directly take the output DMA-BUF from the VPE and feed it to the SGX 544 GPU using OpenGL. I can achieve this, but directly passing the mmap'd ...
https://www.mjmwired.net/kernel/Documentation/dma-buf-sharing.txt
Documentation / dma-buf-sharing.txt. Custom Search Based on kernel version 4.10.8. ... 464 465 - If an exporter needs to manually flush caches and hence needs to fake 466 coherency for mmap support, it needs to be able to zap all the ptes pointing 467 at the backing storage.
https://elinux.org/images/a/a8/DMA_Buffer_Sharing-_An_Introduction.pdf
API • dma_buf_export(): Used to announce the wish to export a buffer Connects the exporter's private metadata for the buffer, an implementation of buffer operations for this buffer, and flags for the associated file. Returns a handle to the dma_buf object with all the above associated information. • dma_buf_fd(): Returns a FD associated with the dma_buf object.
https://devtalk.nvidia.com/default/topic/1039244/v4l2-dma_buf-driver-by-pcie/?offset=1
Oct 03, 2019 · That's work fine. But I don't think memcopy is a high efficiency way,especially high resolution and fps camera. Currently, our camera was 1280x1024@60fps. I noticed example code 12_camera_v4l2_cuda was base on V4L2_MEMORY_DMABUF, and nvidia vi4 driver support "VB2_MMAP VB2_DMABUF VB2_READ VB2_USERPTR" feature.
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