主要工作是获取一段连续的物理页,然后调用plat_map_dma_mem来获取DMA的总线地址,函数返回值就是这段DMA内存的虚拟地址,由驱动使用。 调用dma_alloc_coherent可以获取一段指定大小的DMA内存,但是地址不能指定,因为对于驱动来说它不需要关心缓存一致的区域在哪。 不使用调用void dma_free_coherent(struct device *dev,...
Development version of the Upstream MultiPath TCP Linux kernel 🐧 - PCI/P2PDMA: Remove pci_p2pdma_[un]map_sg() · multipath-tcp/mptcp_net-next@0d06132
There has been talk of deprecating dma_map_single() in favour of dma_map_sg() (i.e. make all transfers use scatter/gather and eliminate dma_map_single() in favour of a single sg entry table) but nothing has been done about it (at least as far as I know). James Thanks, Jamie W...
intpci_map_sg(structpci_dev *pdev,structscatterlist *sgl,intnum_entries,intdirection) sgl表示分散内存的链表 num_entries表示分散内存的链表中入口数。 ret:返回被映射的入口数 示例 num_mapped = pci_map_sg(pdev,sgl,num_entries,PCI_DMA_TODEVICE);for(i=0; i< num_mapped;i++) { sg_dma_add...
maps an I/O DMA address to a physical memory address). However, to be portable, device driver writers may *not* assume that such an IOMMU exists. @@ -296,7 +296,7 @@ reduce current DMA mapping usage or delay and try again later). dma_map_sg(struct device *dev, struct scatterlist...
此外,CPLD还能利用高速FIFO缓存的空、满标志位,配合PCI接口芯片实现DMA写操作,完成高速数据传输。Xilinx公司的XC9572XL-VQ64芯片的脚到脚延迟最大为10ns,可满足PCI总线接口时序的要求。单片XC9572XL-VQ64能满足焊缝缺陷自动超声检测系统逻辑控制的要求,且具有体积小、可靠性高、调试方便等突出优点。
#define PCI_DEVICE_ID_AMD_10H_NB_MAP 0x1201 #define PCI_DEVICE_ID_AMD_10H_NB_DRAM 0x1202 #define PCI_DEVICE_ID_AMD_10H_NB_MISC 0x1203 #define PCI_DEVICE_ID_AMD_10H_NB_LINK 0x1204 #define PCI_DEVICE_ID_AMD_11H_NB_HT 0x1300 #define PCI_DEVICE_ID_AMD_11H_NB_M...
DMA/Bridge Subsystem for PCI Express V4.1 概述:XDMA这个IP的名字就透露了XDMA的几个功能 1.XDMA可以配置成DMA+PCIE的模式,就是具备DMA功能的PCIE设计,但是需要注意的是这个DMA是SG_DMA,不是block_dma; 这个…
4. To add pin assignments for the EP4SGX230KF40C2 device, copy all the text included in to the chaining DMA design example .qsf file, \top_examples\chaining_dma\top_example_chaining_top.qsf to your project .qsf file. August 2014 Altera Corporation IP Compiler for PCI Express User ...
#define PCI_DEVICE_ID_AMD_K8_NB_ADDRMAP 0x1101 #define PCI_DEVICE_ID_AMD_K8_NB_MEMCTL 0x1102 #define PCI_DEVICE_ID_AMD_K8_NB_MISC 0x1103 #define PCI_DEVICE_ID_AMD_10H_NB_HT 0x1200 #define PCI_DEVICE_ID_AMD_10H_NB_MAP 0x1201 #define PCI_DEVICE_ID_AMD_10H_NB_DRAM 0x...