PCIe在ISR内读写 [英] PCIe read write within ISR

问题描述

我在ARM上运行Linux并通过PCIe访问FPGA。我可以在驱动程序代码中执行对PCIe的读/写操作，但不能在ISR中执行。



我正在修改linux PCIe驱动程序以使用altera FPGA PCIe核心。在我的驱动程序代码中，我是pci_set_master（dev）使PCIe读写工作。



我正在使用altera SG-DMA进行PCIe传输而不是使用ARM DMA。我需要将启用位写入FPGA DMA以启动传输。它通过对启用位寄存器进行pcie写入（barx，偏移，数据）来完美地工作。



问题是，我需要我的系统来启动PCIe FPGA发生I / O中断时发生DMA，但是当发生中断时，在ISR中我把pcie写入（barx，offset，data），这导致整个linux挂起。



以前有人面对这个吗？请帮我。提前谢谢。

I'm running Linux on ARM and accessing FPGA through PCIe. I can perform read/write to PCIe in driver code but not in ISR.

I'm modifying a linux PCIe driver to work with altera FPGA PCIe core. Inside my driver code, I'do pci_set_master(dev) to make the PCIe read write working.

I'm using altera SG-DMA to do PCIe transfer instead of using ARM DMA. I need to write enable bit to the FPGA DMA to initiate the transfer. It is working perfectly by doing pcie write(barx,offset,data) to the enable bit register.

The problem is, I need my system to initiate the PCIe FPGA DMA when an I/O interrupt happen, but when interrupt happen, inside the ISR i put the pcie write(barx,offset,data) and this cause the whole linux hang there.

Anyone have face this before? Please help me. Thanks in advance.

推荐答案

对不起伙计们，我发现我做错了码。完成探测后，我不小心取消了驱动程序空间中的bar0地址。因此中断发生，它使写入bar0失败。我已经解决了这个问题。



谢谢

Hi,

Sorry guys, I found something I do wrong within my code. I accidentally unmap the bar0 address in driver space once it finish probing. Hence the the interrupt happened, it make write into bar0 failed. I solved this already.

Thanks

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