pci | 易学教程

PCIE项目中AXI4 IP核例化详解

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PCIE项目中AXI4 IP核例化本文为明德扬原创文章，转载请注明出处！本工程实现PCIE的8通道速率2.2GBps通信，并验证数据的正确性。本工程里已经把PCIE部分做成一个封装的模块，对外提供的是fifo_wr(数据发送fifo)接口和fufi_rd(数据接收的fifo接口)，用户只要操作fifo接口，无需关心PCIE的内部驱动。为了便于读者更加明白，可以深入了解PCIE，我们将会制作一个PCIE的连载系列。今天，首先说一下自定义AXI4的IP核，至于AXI4和PCIE之间有什么联系，敬请关注我们的连载系列文章。在本篇文章中暂时先不讲解AXI4协议，先来分享例化AXI4的自定义IP核详细步骤。一、新建工程为了节省篇幅，新建工程部分就不详细讲解，以下为我们新建好的工程：二、创建自定义IP 点击"Tools"菜单下的"Create and Package New IP"，如下图所示：按照指引，点击"next"：选择AXI4的IP核：输入IP核的名称：点击"next"：创建和使用AXI4的IP核三、生成BD文件创建AXI4完毕之后系统会自动生成一个bd文件，如下图所示：四、修改IP 五、修改需求在修改IP核之后系统会自定的给我们打开另一个工程，我修改为我们自己的需求，打开的工程如下所示：修改自己的逻辑，添加自己的逻辑端口：六、封装IP

How to get bus/device/number from struct pci_dev?

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问题 https://elixir.bootlin.com/linux/latest/source/include/linux/pci.h#L286 In struct pci_dev, I can only see bus and function: struct pci_bus *bus; and unsigned int devfn; seems no device (of B/D/F) information? and struct pci_slot *slot; In my test, the *slot point to NULL, why ? 回答1: I found: device = PCI_SLOT(pdev->devfn); fn = PCI_FUNC(pdev->devfn); https://elixir.bootlin.com/linux/v3.5/source/include/linux/pci.h#L31 回答2: Devfn contains the device number in bits 7:3 and the function number

pcie inbound、outbound及EP、RC间的互相訪问

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Inbound:PCI域訪问存储器域 Outbound:存储器域訪问PCI域 RC訪问EP: RC存储器域->outbound->RC PCI域->EP PCI域->inbound->EP存储器域 EP訪问RC：EP存储器域->outbound->EP PCI域->RC PCI域->inbound->RC存储器域 Out即出去，发起訪问的一側，须要进行outbound，去訪问对端 In即进来，被訪问的一側，须要进行inbound，使得对端能够訪问 EP訪问RC演示样例（蓝色箭头）：（1）首先，EP须要配置outbound，RC须要inbound(一般RC端不用配)，这样就建立了EP端0x20000000到RC端0x50000000的映射（2）在RC端改动0x50000000的内容，EP端能够看到对应的变化。从EP端读/写0x20000000和从RC端读/写0x50000000，结果是一样的 RC訪问EP演示样例（黑色箭头）：（1）首先，RC端须要配置outbound(一般内核中配好)，EP端须要inbound(0x5b000000 inbound到BAR2)，这样就建立了RC端0x20100000（BAR2）到EP端0x5b000000的映射（2）在EP端改动0x5b000000内存的内容，在RC端0x20100000能够看到对应的变化，从RC端读

How to get memory range used by a specific device with WMI (Windows Management Instrumentation)

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问题 How can I get the resources used by a specific device (in particular, the memory range) of a specific device knowing it's name and/or DeviceID and/or the Pci bus number, Device number and function number? For example, I want to know what memory range an Intel AHCI Controller uses. With the query "SELECT * FROM Win32_IDEController WHERE Name LIKE\"%ahci%\"" I can get some info like the complete name, device id, and other informations. Then I thought that using the complete name or device id I

Access PCI memory BAR with low latency (Linux)

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问题 Background: I have a PCI card, which is basically a clock. It gets the time by GPS and saves the current time in a certain register. Goal: I want to read a limited number of registers/bytes (for example the current time) over and over again, with the lowest possible latency . (The clock provides very high precision and I think I will loose precision the higher the latency is.). The operating system is RedHat. The programming language is C/C++. I also want to write to the device memory,

Reset FPGA based PCIe card and restore its Config Space

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问题 I am adapting a Windows / Linux driver of a FPGA based PCIe card. (using a LatticeECP3 with PCIe Endpoint) I need to add a driver function to allow a host driven bitstream update of the FPGA without the need of rebooting the host afterwards. I.e. after flashing I would need to reset the FPGA to let the bitstream be reloaded. This of course would lead to a loss of the Config Space settings of PCIe endpoint. My first approach was to implement following steps: Save the PCI config space of the

Why driver need to map DMA buffers when dma-engine is in device?

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问题 DMA buffers are memory mapped by the driver. For example, in pci-skeleton.c, which uses rtl8319 we have: tp->tx_bufs = pci_alloc_consistent(tp->pci_dev, TX_BUF_TOT_LEN, &tp->tx_bufs_dma); But DMA engine can reside in soc or in device. **Is it that dma buffers should be allocated even if DMA engine is in device ? Why ? ** rtl8139cp datasheet (I think the dma is part of the device, but not sure about it): http://realtek.info/pdf/rtl8139cp.pdf I believe that "dma engine" and "dma controller"

PCI设备编号

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1.PCI设备编号每一个PCI device都有其unique PFA(PCI Fcntion Address) PFA由 bus number、device number、function number组成一条PCI总线支持256个PFA，即支持256个PCI device 每个PCI芯片都有自己的device number(取决于IDSEL管脚)，每个PCI芯片占用8个PFA。每个PCI芯片的第一个PCI device的PFA必为8的倍数。若PCI device的配置空间中PCI_HEADER_TYPE寄存器的最高bit为1，说明此芯片还有其他PFA，即还有其他device，即当前芯片是 multi-function device . Each function on a multi-function device has its own configuration space 在系统中，每个PCI芯片上的所独有的信号线是：INTA、INTB、INTC、INTD、IDSEL 每个芯片上的IDSEL需要连到PCI总线中AD[31:11]中的一根，这对应于PCI device PFA的device number IDSEL is equivalent to chip select on the CPU side during address phase of CFG RD

AIX 系统收集信息

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1.uname -uM //查看机器序列号 [P55A#/]uname -uM IBM,9133-55A IBM,03064E69H 2.oslevel -s //查看操作系统版本 [P55A#/]oslevel -s 6100-07-04-1216 3.查看CPU信息： lsdev -C|grep proc //查看cpu信息，可以查看CPU个数 [P55A#/]lsdev -C|grep proc proc0 Available 00-00 Processor 4.bootinfo -r //查看内存信息 [P55A#/]bootinfo -r 12124160 //以KB为单位 prtconf -m //查看内存信息，系统总配置内存 [P55A#/]prtconf -m Memory Size: 11840 MB lsdev -Cc memory //查看物理内存配置情况 [P55A#/]lsdev -Cc memory L2cache0 Available L2 Cache mem0 Available Memory lsattr -El mem0 //查看内存信息，可以查看到总安装内存以及可使用内存 [P55A#/]lsattr -El mem0 ent_mem_cap I/O memory entitlement in Kbytes False goodsize

Determine what (if any) PCI devices are plugged into motherboard PCI(e) slots

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问题 I am writing a program in C# to perform a hardware audit across many Windows XP workstations. I need to determine which PCI devices are actual cards connected via a motherboard slot - NOT onboard devices that also use the PCI buses (built into the motherboard). I can successfully list all devices that use all the PCI buses using a variety of WMI classes, but none provide any indication of what is onboard vs. what is connected via a slot. I am not fussy about how the information is retrieved

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