Ion dmabuf. 12) allocating with ION_SYSTEM heap name, or legacy ion (pre 4. com/kernel...
Ion dmabuf. 12) allocating with ION_SYSTEM heap name, or legacy ion (pre 4. com/kernel/common/ +/8e1ec97355ef9927e82ec18c98312bdcd80bf289%5E%21/ And since we return a dma_heap to the driver to allocate against: 13 hours ago · 取代ION：在Android生态中，Google曾开发了名为ION的内存管理器，其功能与 dma-buf 有很多重叠。 ION虽然解决了Android的燃眉之急，但其设计被认为是“中心化”的，并且长期未能被Linux内核主线完全接受。 Jan 29, 2026 · The following sections list the components that deal with ION and describe how to switch them over to the DMA-BUF heaps framework. > > In Android, once folks were familiar with thinking about dma-buf > heaps, some (out of tree) drivers wanted to be able to internally > allocate from a given heap (somewhat of a hold-over from the old ION Buffer Sharing and Synchronization (dma-buf) ¶ 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. So we have a convenience patch to provide that: https://android. 因此，您可以使用一组不同的 API 来注册堆，从 ION 堆实现切换为 DMA-BUF 堆实现。 下表显示了 ION 堆注册 API 及其等效的 DMA-BUF 堆 API。 DMA-BUF 堆不支持堆专用标志。 因此，这类堆的每个变体都必须使用 dma_heap_add() API 单独注册。 Each heap driver gets its own chardev, no multiplexing heaps through one interface Helper functions to avoid duplication where possible er-allocation ids). As an example, it is used extensively by the DRM subsystem to exchange buffers between processes, contexts, library APIs within the same process, and also to Feb 8, 2012 · ION and DMABUF can be separately integrated into multimedia applications written using the Video4Linux2 API. You can ignore that suggestion. 12) with system heap_id. You can still write your own dma Vendors: Please move your ION code over to DMA-BUF Heaps once its upstream! 1 day ago · On 2/24/2026 3:33 AM, Bjorn Andersson wrote: > On Tue, Feb 24, 2026 at 12:38:54AM +0530, Ekansh Gupta wrote: >> This patch series introduces the Qualcomm DSP Accelerator (QDA) driver, >> a modern DRM-based accelerator implementation for Qualcomm Hexagon DSPs. libdmabufheap supports allocation in DMA-BUF heaps and ION heaps. . Adding begin_device_access() and end_device_access() calls and hooks in the dma_buf_ops. Jan 29, 2026 · To make the transition easy for user-space clients of ION, an abstraction library called libdmabufheap is available. 4 days ago · > Oh, apologies I mixed this up. In the case of ION, these multimedia programs tend to use PMEM now on Android devices, so switching to ION from PMEM should have a relatively small impact. 10 and Contribute to yamihaha/DiskANN--Kernel-Code development by creating an account on GitHub. Transition kernel drivers from ION to DMA-BUF heaps Kernel drivers implementing ION heaps Both ION and DMA-BUF heaps allow each heap to implement its own allocators and DMA-BUF ops. Also, Android’s ION framework already supported this and for DMA buffer file descriptors to replace ION buffers mmap support was needed. googlesource. >> The driver provides a standardized interface for offloading computational >> tasks to DSPs found on Qualcomm SoCs, supporting all DSP 5 days ago · allocate from a given heap (somewhat of a hold-over from the old ION drivers). There is no special interfaces, userspace simply calls mmap on the dma-buf fd. Issue: This has trouble with device’s waiting on hardware fences, which may start DMA after fence fires, before control goes back to the driver. Eventually, move ownership tracking and CPU cache handling to dmabuf core? Add lockdep style correctness checks? Thanks! Will first try to use “/dev/dma_heap/system”, then will fall back to using modern-ion (post 4. No heap private flags! Currently, no supported heap flags (may be extended) Heaps have full control of their dmabuf exporter (no midlayer logic) Pro: Don’t have to hack up ION code, heaps can all coexist Con: May have to maintain more logic Open to adding sharable helper logic that heaps can re-use rted by android12-5. kvn kpw qyq mra smf clj ckd emc yrv oeu yvn uny bdr bnt klr
