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Dma-buf poll

WebApr 13, 2024 · 数据首先以 DMA 的方式从磁盘上读取到内核的文件缓冲区， 然后再从文件缓冲区读取到了 socket 的缓冲区，该过程由 CPU 负责完成。 接着网卡再以 DMA 的方式从 socket 缓冲区 拷贝到自己网卡缓冲区，然后进行发送 Linux 内核 2.4 版本以后对 sendFile 进行了进一步优化，提供了带有 scatter/gather 的 sendfile 操作，将仅有一次的 CPU 参与 … 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 ...

DMA Programming Guide :: NVIDIA DOCA SDK Documentation

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 … WebThe 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. ecote colby oversized https://bwautopaint.com

Buffer Sharing and Synchronization (dma-buf) - Linux kernel

WebLKML Archive on lore.kernel.org help / color / mirror / Atom feed * [RFC v2 dma-buf 0/3] Improve the dma-buf tracking @ 2024-03-22 2:51 Chenbo Feng 2024-03-22 2:51 ` [RFC v2 1/3] dma-buf: give each buffer a full-fledged inode Chenbo Feng ` (3 more replies) 0 siblings, 4 replies; 11+ messages in thread From: Chenbo Feng @ 2024-03-22 2:51 UTC … 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 WebThe Atlanta DMA is comprised of 55 counties. 2 in Alabama, 52 in Georgia, 1 in North Carolina. ATLANTA DMA is number 10 Designated Market Area in United States, as … ecotec midget car motor mounts

[PATCH v2 7/9] dma-buf: add poll support, v3 - Mail Archive

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Dma-buf poll

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

WebNote 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 … 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)) {

Dma-buf poll

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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 */ WebNov 30, 2024 · DOCA DMA provides an API to copy data between DOCA buffers using hardware acceleration, supporting both local and remote memory regions. The library provides an API for executing DMA operations on DOCA buffers, where these buffers

WebJul 23, 2024 · >>> in dma_buf_release, which could be triggered by user space closing the >>> dma-buf file description while there are outstanding fence callbacks >>> from …

Webstruct dma_buf *dmabuf = container_of(dcb->poll, struct dma_buf, poll); unsigned long flags; spin_lock_irqsave(&dcb->poll->lock, flags); wake_up_locked_poll(dcb->poll, dcb … WebJul 11, 2012 · dma-fence: dma-buf synchronization. [email protected], [email protected], [email protected]. From: Rob Clark …

Web2.15.1. 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 ...

WebJan 2, 2024 · Joanna at a DFMA Board Meeting. in 2009 Image courtesy of KU4GC. Hillsborough, North Carolina - Joanna Marie George, 80, passed away on Saturday, … eco-tec pickeringWebJun 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 … concert green bay wiWebThe DMABUF framework provides a generic method for sharing buffers between multiple devices. Device drivers that support DMABUF can export a DMA buffer to userspace as … concert green day 2022WebAPI • 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 … concert habere lullinWebShared DMA Buffers Reservation Objects DMA Fences Device links Component Helper for Aggregate Drivers Message-based devices InfiniBand and Remote DMA (RDMA) Interfaces Frame Buffer Library Voltage and current regulator API Reset controller API Industrial I/O Input Subsystem Linux USB API Firewire (IEEE 1394) driver Interface Guide ecotec plus 831 r1 cost to runWebThe dma-buf subsystem provides the framework for sharing buffers for hardware (DMA) access across multiple device drivers and subsystems, and for synchronizing … ecotec pro 28 installation manualWebstruct_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 … ecotec plus heizung optimieren