Jan 7, 2021 · In this article, I want to discuss some basics of the Linux PCI/PCIe drivers development. I think this issue is not properly covered, and some existing information is might be outdated. I will show basic concepts and important structures, and this is might be a good beginner guide for newbie driver developers.

SCSI low level drivers LIO struct bio - operation & flags - target device - bvec list - bvec_iter (sector, size, index) ... PCIe NVMe Persistent memory Micron PCIe N64 cartridge SD-/MMC-Card IBM DASD network iscsi_tcp ... The Linux Storage Stack Diagram (Linux Kernel 6.2)

This short paper tries to introduce all potential driver authors to Linux APIs for PCI device drivers. A more complete resource is the third edition of “Linux Device Drivers” by Jonathan Corbet, Alessandro Rubini, and Greg Kroah-Hartman.

Stacking just means that some module calls functions defined in another module. There is an example right on the page you cite. According to the figure, lp is a driver for printers on parallel ports. It makes calls into the generic parallel port driver parport.

To fit within the existing Linux R 2 PCI Driver Model but provide a clean and modular solu-tion, in which each service driver can be built and loaded independently, requires the PCI Ex-press Port Bus Driver architecture. The PCI Ex-press Port Bus Driver initializes all services and distributes them to their corresponding service drivers.

The PCIe driver is designed based on PCIE Designware Core driver. The Designware Core driver is enhanced to support Keystone PCIe driver in the mainline kernel. The diagram below shows the various drivers that Keystone PCI depends on to implement the RC driver.

This repository contains a Linux kernel module for PCIe devices that demonstrates the setup of a PCIe driver with DMA (Direct Memory Access) capabilities. It is designed to be a starting point for developing PCIe drivers that utilize DMA for high-speed data transfer between the host and a PCIe device, typically an FPGA or similar hardware.

The Linux I/O Stack Diagram version 0.1, 2012-03-06 outlines the Linux I/O stack as of Kernel version 3.3

Key components include the VFS layer, block I/O layer, I/O scheduler, SCSI layers, libata, device drivers and physical devices like HDDs, SSDs and PCIe cards. This document outlines the Linux I/O stack as of Kernel version 3.3.

Reading PCI/PCIe drivers is being told the solution without understanding the problem. We shall try to fill that gap Part I: Understanding the hardware: Buses, PCI, PCIe, interrupts Part II: Highlights of a PCI/PCIe driver Not covered: General kernel hacking practices (character devices, mutexes, spinlocks etc.)