pci_ioremap_bar 出错 pci map sg 3、Mapped Memmory MMIO(Memory mapping I/O)即 内存映射I/O,它是PCI规范的一部分,I/O设备被放置在内存空间而不是I/O空间。从处理器的角度看,内存映射I/O后系统设备访问起来和内存一样。这样访问AGP/PCI-E显卡上的 帧缓存,BIOS,PCI设备就可以
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...
(sc->send[chnl]->msgs, &msg_type, &msg))) tymeout = schedule_timeout(tymeout); finish_wait(&sc->send[chnl]->waitq, &wait); if (signal_pending(current)) { free_sg_buf(sc, sc->send[chnl]->sg_map_0); free_sg_buf(sc, sc->send[chnl]->sg_map_1); return -ERESTARTSYS; ...
mmap(NULL, MEMORY_REGION_SIZE, PROT_READ, MAP_SHARED, fd, pci_addr);if (mmap_addr == MAP...
INSTANCE MAP, default = 1 (1 group/board) DM3 Architecture PCI Products on Windows Configuration Guide — November 2003 35 CONFIG File Details After editing: [NFAS] SetParm=0x3e02,0xf !INSTANCE MAP - 4 NFAS groups/board 3.5 [CAS] Section Information about the [CAS] section of the ...
12. allocate_chnls():这个主要是通过pci_alloc_consistent申请dma的读/写multi-page内存,并形成sglist环形链表,并保存在fpga_state中,完成用户态多通道dma的读写请求。 四、写操作 基本的读写操作通过ioctl来调用对应的driver驱动的实现。我们补充一下,ioctl是设备驱动程序中设备控制接口函数,一个字符设备驱动通常会...
{returndma_map_sg(hwdev==NULL?NULL:&hwdev->dev,sg,nents,(enumdma_data_direction)direction);}staticinlinevoidpci_unmap_sg(structpci_dev*hwdev,structscatterlist*sg,intnents,intdirection){dma_unmap_sg(hwdev==NULL?NULL:&hwdev->dev,sg,nents,(enumdma_data_direction)direction);}staticinline...
9.用户接口:memory map和stream接口二选一,用来进行大数据通信; 10.DMA bypass支持AXI和AXILITE master接口; 11.lite slave可以用于反问DMA内部状态寄存器; 12.DMA SG描述符链表支持无限大小链表size; 13.每个描述符最大传输大小256MByte(这个是描述符结构体大小还是描述符对应的缓存数据内存块大小?); 14.Legacy,...
MAP3735F SUN72G 1601 Loop ID 10 Port WWN 2100000c5007cafc Lun 0 DISK SEAGATE ST373307FSUN72G 0407 Loop ID 18 Port WWN 2100000c50089c3d Lun 0 DISK SEAGATE ST373307FSUN72G 0407 Loop ID 19 Port WWN 2100000c5007c9bd Lun 0 DISK SEAGATE ST373307FSUN72G 0407 Loop ID 1b Port WWN ...
Number of times a whole page of packets greater than 256 bytes and less than 1514 was dropped because the driver was unable to map a new one to replace it. Number of times a page with a split packet was dropped because the driver was unable to map a new one to replace it. Number ...