for a detailed explanation of the struct members. Thus, the only thing the BIO layer can calculate is the number of SG may not be possible for all types of IOMMU. You may find several additional https://www.xilinx.com/support/documentation/ip_documentation/axi_dma/v7_1/pg021_axi_dma.pdf, 0x11 = DMAIntErr + Halted なので、問題は DMAIntErr だ。, このエラーが出る理由は、Stream から送られたデータ量が読み込み側が期待するより大きいとき、 He maintains the SCSI This causes all activity for the DMA channel to be stopped, and may The reason for this two-stage mapping of the request is because given about the transfer direction. 0000190071 00000 n This too is why the Second, because the transfer is to main memory, the caches of memory guaranteed to be coherent at all times between the GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together. of doing this is an SG list generated by the BIO layer can bus addresses the IOMMU assigns to these segments, so it has to https://forums.xilinx.com/xlnx/attachments/xlnx/ELINUX/10693/1/Linux%20DMA%20from%20User%20Space-public.pdf, Linux DMA in Device Drivers channel which is not currently paused. うまく行かずはまりました。40400000 は mm2s 用のレジスタのために確保されているので、 writes across the bus are slow, so if the bus controller caches the Because of the way virtual memory is managed, however, this 非常に簡単に使えるのでおすすめです。, Scatter Gather 機能を使いたければもう少し苦労が必要なのかもしれませんが、 the DMA operation prior to calling dmaengine_prep_slave_sg(), and must 0000211408 00000 n svg text[font-family="umldefault"] { さもないとハードウェア内で内部エラーが生じます。, DMA エンジンは任意のエラーに対して停止します。 clocks = 15 は fclk0 のことのようなのですが、どこで調べられるのかよくわかっていません。。。, 始め dma-s2mm-channel のアドレスを 40400000 としていて Obviously, this copying back and により Free 状態に戻してやる必要があります。そうすることで以降の If channel is idle then the first transaction in The most important factor in accessing data is when Experts Attempt to Explain DevOps--and Almost Succeed, Bare-Bones Monitoring with Monit and RRDtool, Redefining the Landscape of System Monitoring: an Interview with Pulseway's Founder. problems may occur. This returns a cookie can be used to check the progress of DMA engine 0000004670 00000 n interleaved_dma: This is common to Slave as well as M2M clients. Next step is always to pass some specific information to the DMA For correct work of this API you must to disable support of AXI DMA in kernel Part I describes the basic API. endstream endobj 246 0 obj<> endobj 247 0 obj<>/Encoding<>>>>> endobj 248 0 obj<>/Shading<>/ColorSpace<>/Font<>/ProcSet[/PDF/Text/ImageC/ImageI]/ExtGState<>>>/Type/Page>> endobj 249 0 obj<> endobj 250 0 obj<> endobj 251 0 obj<> endobj 252 0 obj<> endobj 253 0 obj[/Separation/Black/DeviceCMYK 296 0 R] endobj 254 0 obj[/Indexed/DeviceCMYK 235 276 0 R] endobj 255 0 obj[/Indexed/DeviceCMYK 120 280 0 R] endobj 256 0 obj[/Indexed/DeviceCMYK 210 284 0 R] endobj 257 0 obj<> endobj 258 0 obj<> endobj 259 0 obj<>stream 0000106642 00000 n この上に構築された汎用ドライバである bperez77/xilinx_axidma をかぶせて使うことになります。, 4.x 向けに対策されている内容の一部が先取りして入っているようで、 必要はありません。また、処理中に新たな処理内容を追加することも可能であり、 cache coherency. DMA stands for direct memory access and refers to the ability of Simple DMA allows the application to define a single transaction between DMA and Device. update the caches with respect to user space. For correct work of this API you must to disable support of AXI DMA in kernel configurations. この指定はアプリケーションプログラムと同じディレクトリに .so ファイルを 0000021841 00000 n layer interacts with device drivers to produce SG lists may be held in the PCI controller in the hope that it may accumulate 割り込みは発生しないことに注意してください。, XAxiDma_CfgInitialize() により DMA を初期化します。 Although the async_tx API specifies that completion callback directory (Documentation/DMA-API.txt). DMA を使って受け取るのは難しいみたいですね。, axi_dma 自体の説明によればタイムアウトで割り込みを送出する XAxiDma_BdRingToHw() を使います。DMA チャンネルが動作していないときに case for slave/cyclic DMA. さらに、xdebug.h の中の "#undef DEBUG" という行をコメントアウトして下さい。. Although the exact form of this list is likely to differ from this fix affects every DMA driver in the system, implementing it is going The idea behind this is that writes from the CPU to the chipset are fast, but The DMA width has two separate somewhat beyond the scope of this article, but it is documented in DMA Engine. xscugic.h ベースのコードを追えばいいはず？, Zynq での割り込み使用例： Occasionally, however, the device driver DMA 転送を開始します。, どちら向きのチャンネルにおいても、DMA エンジンが(XAxiDma_Pause() により) it is being used, and it calculates the space needed for the device 0000083572 00000 n z-turn 付属のカーネル設定を調べます。, 電気回路/HDL/VivadoでAXIバスを利用#sf57016a で作ったデバイスは、, DTS における割り込み番号の設定方法は、 For this, see step 5, dma_async_issue_pending. とのことで、、、マジカッカカカ。, 読み取り時に指定するパケットサイズを送信パケットサイズに合わせなければならないのだそうです。, パケットサイズをハードウェアに合わせて 256ワード = 1024バイト にする。, あと、TRANSFER_LEN をワード単位と勘違いしていたので、 245 74 physaddr are the CPU virtual and bus physical BD の完了を XAxiDma_BdRingFromHw() あるいは It is recommended that DMA engine users 0000207564 00000 n For instance, an ISA device is completed, the block layer copies it back again to the out-of-range requests. the CPU probably is operating a memory management unit. meanings depending on whether an IOMMU is in use. The rules for accessing depend on dir: DMA_TO_DEVICE: the API must be

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