Linux dma-buf heap

Author: igkv

August undefined, 2024

NettetRe: [PATCH] dma-buf/heaps: c9e8440eca61 staging: ion: Fix overflow and list bugs in system heap: From: T.J. Mercier Date: Wed Mar 29 2024 - 12:46:16 EST Next … Nettetdmabuf = heap->ops->allocate (heap, len, fd_flags, heap_flags); if (IS_ERR (dmabuf)) return PTR_ERR (dmabuf); fd = dma_buf_fd (dmabuf, fd_flags); if (fd < 0) { …

Linux-Kernel Archive: [PATCH v2] misc: sram: Add DMA-BUF Heap …

Nettet2. okt. 2024 · Here is yet another pass at the dma-buf heaps patchset Andrew and I have been working on which tries to destage a fair chunk of ION functionality. The patchset … Nettet27. aug. 2024 · With buffers that size, your 512MB heap doesn't go too far, and it's also shared with any items on the display (eg the framebuffer or X desktop). Stills capture is going to want at least one 75MB input buffer, and an output buffer of either 91 or 182MB. That's potentially 257MB straight off. isca cyber

[03/14] dma-buf: Replace dma-buf-map with iosys-map

NettetDMA-BUF Userland Memory Heaps modulename: dma-heap.ko configname: CONFIG_DMABUF_HEAPS Linux Kernel Configuration └─> Device Drivers └─> … NettetIt appears like nr could be a Spectre v1 gadget as it's supplied by a user and used as an array index. Prevent the contents of kernel memory from being leaked to userspace via … Nettet4. sep. 2013 · The dma-buf system doesn't provide any method for allocation, but provides a generic structure that can be used to to share buffers between a number of different devices and applications. The dma-buf structures are shared to user space using a file descriptor, which avoids the potential security issues with GEM flink IDs. is cad hereditary

Linux-Kernel Archive: RE: [PATCH] dma-buf/heaps: c9e8440eca61 …

DMA BUF Heap Transition in AOSP - Linaro

Nettet2. okt. 2024 · DMA-BUF Heaps (destaging ION) Here is yet another pass at the dma-buf heaps patchset Andrew and I have been working on which tries to destage a fair chunk of ION functionality. The patchset implements per-heap devices which can be opened directly and then an ioctl is used to allocate a dmabuf from the heap. Nettet9. jul. 2024 · Recently, John Stultz posted a patch set introducing DMA-BUF heaps, an evolution of ION, that is designed to do exactly that — get the Android DMA-buffer … is cactus an ornamental plantNettet11. jan. 2012 · One of the actions performed by dma_buf_export () is the creation of an anonymous file to represent the buffer; flags is used to set the mode bits on that file. Since the file is anonymous, it is not visible to the rest of … is cadbury world merlin

"NettetDMA-BUF Heaps • A framework for memory allocators to behave like devices that export buffers as DMA-BUFs without being part of a use-case specific framework. • Focused … " - Linux dma-buf heap

Linux dma-buf heap

drivers/dma-buf/dma-heap.c - kernel/common - Git at Google

Nettet13. apr. 2024 · Dma-buf既不是dma也不是buffer，它是一个buffer sharing框架，重点是sharing。Dma-buf框架实现了进程与进程之间、进程与内核之间的内存共享方案。但是它仅仅是一个框架，本身并没有分配内存的能力。ION则在dma-buf框架的基础之上实现了内存分配管理功能，所以应该把ION ...

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NettetNext in thread: kernel test robot: "Re: [PATCH v2] misc: sram: Add DMA-BUF Heap exporting of SRAM areas" Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] … NettetDMA-BUF Heaps. Linux user-space device buffer allocation and its uses. Andrew Davis [email protected] / [email protected] > What are we trying to solve • Frameworks that …

Nettet17. nov. 2024 · This is a major tradeoff with the DMA BUF Heaps design, as drivers that allocate their own memory can quickly allocate an uninitialized buffer and have the device fill it before passing it to … Nettet11. sep. 2024 · DMA-BUF Heaps: Linux User-space Device Buffer Allocation and its Uses - Andrew Davis The Linux Foundation 164K subscribers Subscribe Share Save …

Nettet2. apr. 2024 · We're going to change dma-buf mmap () locking policy such that exporters will have to handle the lock. The previous locking policy caused deadlock problem for DRM drivers in a case of self-imported dma-bufs, it's solved by moving the lock down to exporters. Fixes: 27f3733a1049 ("dma-buf/heaps: Assert held reservation lock for dma … NettetWe're going to change dma-buf mmap() locking policy such that exporters will have to handle the lock. The previous locking policy caused deadlock problem for DRM drivers in a case of self-imported dma-bufs, it's solved by moving the lock down to exporters.

Nettet6. apr. 2024 · We're going to change dma-buf mmap () locking policy such that exporters will have to handle the lock. The previous locking policy caused deadlock problem for DRM drivers in a case of self-imported dma-bufs once these drivers are moved to use reservation lock universally. The problem solved by moving the lock down to exporters.

NettetRe: [PATCH v2] misc: sram: Add DMA-BUF Heap exporting of SRAM areas From: kernel test robot Date: Mon Apr 03 2024 - 23:34:10 EST Next message: xiaolinkui: "[PATCH] … is cad an ischemic heart diseaseNettet28. jan. 2024 · diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c index 602b12d7470d..df23239b04fc 100644 index 602b12d7470d..df23239b04fc 100644 is cadillac ct4 a good carNettet* struct dma_heap - represents a dmabuf heap in the system * @name: used for debugging/device-node name * @ops: ops struct for this heap * @heap_devt heap device node * @list list head connecting to list of heaps * @heap_cdev heap char device * * Represents a heap of memory from which buffers can be made. */ struct dma_heap { … is caddygolf a legit websiteNettetNext in thread: kernel test robot: "Re: [PATCH v2] misc: sram: Add DMA-BUF Heap exporting of SRAM areas" Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] This new export type exposes to userspace the SRAM area as a DMA-BUF Heap, is caddle legitNettet17. jul. 2024 · Current dma-buf heaps can handle only default CMA. This introduces dma_heap_add_cma() function to attach CMA heaps that belongs to a device. At first, the driver calls of_reserved_mem_device_init() to set is cad cvdNettetdma-buffer跨进程、硬件实现内存共享的典型用法如下： 1.特定模块需要分配连续内存，这时需要将cma相关flag告诉importer 2.graphic相关模块通过dma_buf_export ()向dma_buf请求分配内存 3.dma_buf_fd返回fd到graphic用户空间 4.graphic传递fd到video decoder模块（如何实现fd传递不是本次讨论的重点，先略过） 5.video decoder模块通 … is cadence bank in troubleNettetThe problem happens when userpace mmaps a self-imported dma-buf, i.e. mmaps the dma-buf FD. DRM core treats self-imported dma-bufs as own GEMs [2]. There is no way to differentiate a prime GEM from a normal GEM for drm-shmem in drm_gem_shmem_mmap(), which resulted in a deadlock problem for drm-shmem … is cadence bank a good bank