Dma-buf poll

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WebNov 14, 2024 · Dmabuf fds do support mmap, however you MUST do the right thing with regard sync operations (DMA_BUF_IOCTL_SYNC) to avoid bizarre cache issues. There … Webdmabuf->ops = ops; dmabuf->size = size; dmabuf->exp_name = exp_name; + init_waitqueue_head(&dmabuf->poll); + dmabuf->cb_excl.poll = dmabuf->cb_shared.poll = &dmabuf->poll; + dmabuf->cb_excl.active = dmabuf->cb_shared.active = 0; + if (!resv) {

DRM_PRIME, dumb buffers, eglEGLImageTargetTexture2DOES

WebFrom: Chenbo Feng To: [email protected], [email protected], [email protected] Cc: [email protected], Sumit Semwal , [email protected], Daniel Vetter , Greg Hackmann , Chenbo Feng … WebThe dma-buf subsystem provides the framework for sharing buffers for hardware (DMA) access across multiple device drivers and subsystems, and for synchronizing … bubba mitchell

Buffer Sharing and Synchronization — The Linux Kernel …

WebJul 23, 2024 · Re: [PATCH] dma-buf/poll: Get a file reference for outstanding fence callbacks From: Michel Dänzer Date: Fri Jul 23 2024 - 04:19:55 EST Next message: Christian König: "Re: [Linaro-mm-sig] [PATCH] dma-buf/poll: Get a file reference for outstanding fence callbacks" Previous message: Suren Baghdasaryan: "Re: [PATCH v3 … WebThe dma-buf subsystem provides the framework for sharing buffers for hardware (DMA) access across multiple device drivers and subsystems, and for synchronizing … Gpio - Buffer Sharing and Synchronization (dma-buf) - Linux kernel WebThis new IOCTL solves this problem by allowing us to get a snapshot of the implicit synchronization state of a given dma-buf in the form of a sync file. It's effectively the same as a poll() or I915_GEM_WAIT only, instead of CPU waiting directly, it encapsulates the wait operation, at the current moment in time, in a sync_file so we can check ... explain the types of databases

linux/dma-buf.c at master · torvalds/linux · GitHub

dma-buf.c - drivers/dma-buf/dma-buf.c - Linux source code (v6.3 …

WebThe dma-buf subsystem provides the framework for sharing buffers for hardware (DMA) access across multiple device drivers and subsystems, and for synchronizing … WebPort of Entry Type Three Character Code Date of Confirmation Stamp Image; Alburgh, Vermont: Land: ABG: Sep 3, 2012: Alburgh Springs, Vermont: Land: ABS: May 30, 2016 bubba moss motherWebAug 13, 2013 · This patch adds lock and poll callbacks to dma buf file operations, and these callbacks will be called by fcntl and select system calls. fcntl and select system … bubba metal water bottle

"WebJun 11, 2024 · The DMA-BUF heaps interface (along with ION that came before it) concedes that, in some cases, user space knows more about how a buffer will be used than the kernel does. Thus, it can be optimal to let user space choose the … " - Dma-buf poll

Dma-buf poll

How to get ADC-DMA working on a STM32G431KB board with …

Webdmabuf = dentry->d_fsdata; if (unlikely (!dmabuf)) return; BUG_ON (dmabuf->vmapping_counter); /* * If you hit this BUG () it could mean: * * There's a file reference imbalance in dma_buf_poll / dma_buf_poll_cb or somewhere else * * dmabuf->cb_in/out.active are non-0 despite no pending fence callback */ WebRe: [REPOST PATCH 1/8] fence: dma-buf cross-device synchronization (v17) Rob Clark Wed, 18 Jun 2014 18:26:24 -0700 Wed, 18 Jun 2014 18:26:24 -0700

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WebConsider the below scenario where P1 is closing the dma_buf file and P2 is reading the dma_buf's debug info in the system: P1 P2 dma_buf_debug_show () dma_buf_put () __fput () file->f_op->release () dput () .... dentry_unlink_inode () iput (dentry->d_inode) (where the inode is freed) mutex_lock (&db_list.lock) read 'dma_buf->file->f_inode' (the … Web*RFC 0/4] dma-buf Constraints-Enabled Allocation helpers @ 2014-10-10 20:07 Sumit Semwal 2014-10-10 20:07 ` [RFC 1/4] dma-buf: Add constraints sharing information Sumit Semwal ` (4 more replies) 0 siblings, 5 replies; 18+ messages in thread From: Sumit Semwal @ 2014-10-10 20:07 UTC (permalink / raw) To: linux-kernel Cc: linux-media, dri …

WebApr 11, 2024 · Campaign poll. The position of the flag indicates whether the organization is partisan. Organizations are considered partisan if they operate on behalf of a candidate, … WebJul 23, 2024 · Re: [PATCH] dma-buf/poll: Get a file reference for outstanding fence callbacks From: Michel Dänzer Date: Fri Jul 23 2024 - 04:19:55 EST Next message: …

Web+static unsigned int dma_buf_poll (struct file *file, + struct poll_table_struct *wait) + { + struct dma_buf *dmabuf; + struct kds_resource *kds; + unsigned int ret = 0; + + if (!is_dma_buf_file (file)) + return POLLERR; + + dmabuf = file->private_data; + kds = &dmabuf->kds; + + if (poll_does_not_wait (wait)) { WebJul 11, 2012 · dma-fence: dma-buf synchronization. [email protected], [email protected], [email protected]. From: Rob Clark …

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Webdma-buf.h - include/linux/dma-buf.h - Linux source code (v6.2.2) - Bootlin Elixir Cross Referencer - Explore source code in your browser - Particularly useful for the Linux kernel and other low-level projects in C/C++ (bootloaders, C libraries...) Linux debugging Check our new training course Linux debugging, tracing, profiling & perf. analysis explain the types of banksWebThe dmatest module tests DMA memcpy, memset, XOR and RAID6 P+Q operations using various lengths and various offsets into the source and destination buffers. It will initialize both buffers with a repeatable pattern and verify that the DMA engine copies the requested region and nothing more. bubba morgan trucking crowley laWebstruct_dma_buf - shared buffer object. SYNOPSIS¶. struct dma_buf {size_t size;struct file * file;struct list_head attachments;const struct dma_buf_ops * ops;struct mutex … bubba moore foundationWebNote that the dma-buf layer keeps a reference* count for all vmap access and calls down into the exporter's vmap function* only when no vmapping exists, and only unmaps it … bubba monkey breadWeb* struct dma_buf_ops - operations possible on struct dma_buf * @vmap: [optional] creates a virtual mapping for the buffer into kernel * address space. Same restrictions as for … bubba monroe wrestlerWeb2.15.1. Introduction ¶. The videobuf layer functions as a sort of glue layer between a V4L2 driver and user space. It handles the allocation and management of buffers for the storage of video frames. There is a set of functions which can be used to implement many of the standard POSIX I/O system calls, including read (), poll (), and, happily ... explain the types of data in social mediaWebAPI • 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 … bubba moving company