I am writing a PCIe driver for Linux, currently without DMA, and need to know how to read and write to the PCIe device once it is enabled from user space.
In the driver I do the basics in probe():
But then how do I access this memory from user space to read and write? Do I add file operations to my PCIe driver? Does the memory from pci_iomap show up some place where the user space code can call:
open('mapped memory location');
If so then what is the location?
Note: the PCIe device will not plugging into any Linux subsystems such as audio, Ethernet, etc.