Training > Linux Kernel Development > Developing Linux Device Drivers (LFD430)

Developing Linux Device Drivers (LFD430)

This instructor-led Linux device driver course will teach you about the different types of Linux device drivers as well as the appropriate APIs and methods through which devices interface with the kernel.

Who Is It For

This course is for experienced developers who want to learn how to develop device drivers for Linux systems.
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What You’ll Learn

This course will cover the different kinds of device drivers used in Linux, the appropriate APIs through which devices (both hardware and software) interface with the kernel, necessary modules and techniques for Linux driver development and debugging, and much more.
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What It Prepares You For

By the end of this online Linux device driver course you should be able to develop device drivers for Linux systems, grounded in a basic familiarity and understanding of the underlying Linux kernel.
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Course Outline
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- Objectives
- Who You Are
- The Linux Foundation
- Copyright and No Confidential Information
- Linux Foundation Training
- Certification Programs and Digital Badging
- Linux Distributions
- Platforms
- Preparing Your System
- Using and Downloading a Virtual Machine
- Things Change in Linux and Open Source Projects
- Documentation and Links
- Procedures
- Kernel Versions
- Kernel Sources and Use of git
- Rolling Your Own Kernel
- Hardware
- Staging Tree
- Labs
How to Work in OSS Projects **
- Overview on How to Contribute Properly
- Know Where the Code is Coming From: DCO and CLA
- Stay Close to Mainline for Security and Quality
- Study and Understand the Project DNA
- Figure Out What Itch You Want to Scratch
- Identify Maintainers and Their Work Flows and Methods
- Get Early Input and Work in the Open
- Contribute Incremental Bits, Not Large Code Dumps
- Leave Your Ego at the Door: Don't Be Thin-Skinned
- Be Patient, Develop Long Term Relationships, Be Helpful
Device Drivers
- Types of Devices
- Mechanism vs. Policy
- Avoiding Binary Blobs
- Power Management
- How Applications Use Device Drivers
- Walking Through a System Call Accessing a Device
- Error Numbers
- printk()
- devres: Managed Device Resources
- Labs
Modules and Device Drivers
- The texttt {module_driver() Macros
- Modules and Hot Plug
- Labs
Memory Management and Allocation
- Virtual and Physical Memory
- Memory Zones
- Page Tables
- kmalloc()
- __get_free_pages()
- vmalloc()
- Slabs and Cache Allocations
- Labs
Character Devices
- Device Nodes
- Major and Minor Numbers
- Reserving Major/Minor Numbers
- Accessing the Device Node
- Registering the Device
- udev
- texttt {dev_printk() and Associates
- file_operations Structure
- Driver Entry Points
- The file and inode Structures
- Miscellaneous Character Drivers
- Labs
Kernel Features
- Components of the Kernel
- User-Space vs. Kernel-Space
- What are System Calls?
- Available System Calls
- Scheduling Algorithms and Task Structures
- Process Context
- Labs
Transferring Between User and Kernel Space
- Transferring Between Spaces
- copy_to(from)_user()
- Direct Transfer: Kernel I/O and Memory Mapping
- Kernel I/O
- Mapping User Pages
- Memory Mapping
- User-Space Functions for mmap()
- Driver Entry Point for mmap()
- Accessing Files from the Kernel
- Labs
Interrupts and Exceptions
- What are Interrupts and Exceptions?
- Exceptions
- Asynchronous Interrupts
- Enabling/Disabling Interrupts
- What You Cannot Do at Interrupt Time
- IRQ Data Structures
- Installing an Interrupt Handler
- Labs
Timing Measurements
- Kinds of Timing Measurements
- Jiffies
- Getting the Current Time
- Clock Sources
- Real Time Clock
- Programmable Interval Timer
- Time Stamp Counter
- Going Tickless
- Labs
Kernel Timers
- Inserting Delays
- What are Kernel Timers?
- Low Resolution Timer Functions
- Low Resolution Timer Implementation
- High Resolution Timers
- Using High Resolution Timers
- Labs
- What are ioctls?
- Driver Entry point for ioctls
- Defining ioctls
- Labs
Unified Device Model and sysfs
- Unified Device Model
- Basic Structures
- Real Devices
- sysfs
- kset and kobject examples
- Labs
- What is Firmware?
- Loading Firmware
- Labs
Sleeping and Wait Queues
- What are Wait Queues?
- Going to Sleep and Waking Up
- Going to Sleep Details
- Exclusive Sleeping
- Waking Up Details
- Polling
- Labs
Interrupt Handling: Deferrable Functions and User Drivers
- Top and Bottom Halves
- Softirqs
- Tasklets
- Work Queues
- New Work Queue API
- Creating Kernel Threads
- Threaded Interrupt Handlers
- Interrupt Handling in User-Space
- Labs
Hardware I/O
- Buses and Ports
- Memory Barriers
- Registering I/O Ports
- Reading and Writing Data from I/O Registers
- Allocating and Mapping I/O Memory
- Accessing I/O Memory
- Access by User - ioperm(), iopl(), /dev/port
- Labs
- What is PCI?
- PCI Device Drivers
- Locating PCI Devices
- Accessing Configuration Space
- Accessing I/O and Memory Spaces
- PCI Express
- Labs
Platform Drivers**
- What are Platform Drivers?
- Main Data Structures
- Registering Platform Devices
- An Example
- Hardcoded Platform Data
- The New Way: Device Trees
- Labs
Direct Memory Access (DMA)
- What is DMA?
- DMA Directly to User
- DMA and Interrupts
- DMA Memory Constraints
- DMA Masks
- DMA Pools
- Scatter/Gather Mappings
- Labs
Network Drivers I: Basics
- Network Layers and Data Encapsulation
- Datalink Layer
- Network Device Drivers
- Loading/Unloading
- Opening and Closing
- Labs
Network Drivers II: Data Structures
- net_device Structure
- net_device_ops Structure
- sk_buff Structure
- Socket Buffer Functions
- texttt {netdev_printk() and Associates
- Labs
Network Drivers III: Transmission and Reception
- Transmitting Data and Timeouts
- Receiving Data
- Statistics
- Labs
Network Drivers IV: Selected Topics
- Multicasting **
- Changes in Link State
- ioctls
- NAPI and Interrupt Mitigation
- NAPI Details
- TSO and TOE
- MII and ethtool **
USB Drivers
- What is USB?
- USB Topology
- Terminology
- Endpoints
- Descriptors
- USB Device Classes
- USB Support in Linux
- Registering USB Device Drivers
- Moving Data
- Example of a USB Driver
- Labs
Power Management
- Power Management
- ACPI and APM
- System Power States
- Callback Functions
- Labs
Block Drivers
- What are Block Drivers?
- Buffering
- Registering a Block Driver
- gendisk Structure
- Request Handling
- Labs
Closing and Evaluation Survey
- Evaluation Survey
Kernel Architecture I
- UNIX and Linux **
- Monolithic and Micro Kernels
- Object-Oriented Methods
- Main Kernel Components
- User-Space and Kernel-Space
Kernel Programming Preview
- Task Structure
- Memory Allocation
- Transferring Data between User and Kernel Spaces
- Object-Oriented Inheritance - Sort Of
- Linked Lists
- Jiffies
- Labs
- What are Modules?
- A Trivial Example
- Compiling Modules
- Modules vs Built-in
- Module Utilities
- Automatic Module Loading
- Module Usage Count
- Module Licensing
- Exporting Symbols
- Resolving Symbols **
- Labs
Kernel Architecture II
- Processes, Threads, and Tasks
- Kernel Preemption
- Real Time Preemption Patch
- Labs
Kernel Configuration and Compilation
- Installation and Layout of the Kernel Source
- Kernel Browsers
- Kernel Configuration Files
- Kernel Building and Makefiles
- initrd and initramfs
- Labs
Kernel Style and General Considerations
- Coding Style
- Using Generic Kernel Routines and Methods
- Making a Kernel Patch
- sparse
- Using likely() and unlikely()
- Writing Portable Code, CPU, 32/64-bit, Endianness
- Writing for SMP
- Writing for High Memory Systems
- Power Management
- Keeping Security in Mind
- Labs
Race Conditions and Synchronization Methods
- Concurrency and Synchronization Methods
- Atomic Operations
- Bit Operations
- Spinlocks
- Seqlocks
- Disabling Preemption
- Mutexes
- Semaphores
- Completion Functions
- Read-Copy-Update (RCU)
- Reference Counts
- Labs
Memory Addressing
- Virtual Memory Management
- Systems With and Without MMU and the TLB
- Memory Addresses
- High and Low Memory
- Memory Zones
- Special Device Nodes
- Paging
- Page Tables
- page structure
- Labs
Memory Allocation
- Requesting and Releasing Pages
- Buddy System
- Slabs and Cache Allocations
- Memory Pools
- kmalloc()
- vmalloc()
- Early Allocations and bootmem()
- Memory Defragmentation
- Labs

These sections may be considered in part or
in whole as optional. They contain either background reference
material, specialized topics, or advanced subjects. The
instructor may choose to cover or not cover them depending on
classroom experience and time constraints.
To make the most of this course you must have:

Knowledge of basic kernel interfaces and methods such as how to write, compile, load and unload modules, use synchronization primitives, and the basics of memory allocation and management, such as is provided by LFD420 Linux Kernel Internals and Development. Pre-class preparation material will be provided before class.

Jan 2024
The knowledge gained, and my understanding of how device drivers on Linux are organized and built has greatly improved.
Jan 2024
The depth of the technical dive into the subject matter, as well as the short chapters, each ending in a short and clear lab.
Jan 2024
The labs give hands on experience to help cement the concepts.
Jan 2024
The instructor was very knowledgeable, answered questions thoroughly, and followed up on the ones he didn't immediately know the answer to.
Jan 2024
This course was extremely applicable to myself and my team, I felt it was extremely rewarding.