As a kernel module or device driver developer, we can actually create our own entries under /proc, leveraging this as a simple interface to the user space. How can we do this? The kernel provides APIs that create directories and files under procfs. We will learn how to use them in this section.
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Linux Kernel Programming Part 2 - Char Device Drivers and Kernel Synchronization
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Linux Kernel Programming Part 2 - Char Device Drivers and Kernel Synchronization
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Overview of this book
Linux Kernel Programming Part 2 - Char Device Drivers and Kernel Synchronization is an ideal companion guide to the Linux Kernel Programming book. This book provides a comprehensive introduction for those new to Linux device driver development and will have you up and running with writing misc class character device driver code (on the 5.4 LTS Linux kernel) in next to no time.
You'll begin by learning how to write a simple and complete misc class character driver before interfacing your driver with user-mode processes via procfs, sysfs, debugfs, netlink sockets, and ioctl. You'll then find out how to work with hardware I/O memory. The book covers working with hardware interrupts in depth and helps you understand interrupt request (IRQ) allocation, threaded IRQ handlers, tasklets, and softirqs. You'll also explore the practical usage of useful kernel mechanisms, setting up delays, timers, kernel threads, and workqueues. Finally, you'll discover how to deal with the complexity of kernel synchronization with locking technologies (mutexes, spinlocks, and atomic/refcount operators), including more advanced topics such as cache effects, a primer on lock-free techniques, deadlock avoidance (with lockdep), and kernel lock debugging techniques.
By the end of this Linux kernel book, you'll have learned the fundamentals of writing Linux character device driver code for real-world projects and products.
Table of Contents (11 chapters)
Preface
Section 1: Character Device Driver Basics
Free Chapter
Writing a Simple misc Character Device Driver
User-Kernel Communication Pathways
Working with Hardware I/O Memory
Handling Hardware Interrupts
Working with Kernel Timers, Threads, and Workqueues
Section 2: Delving Deeper
Kernel Synchronization - Part 1
Kernel Synchronization - Part 2
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