Developing and Testing Industrial Hardware With QEMU (LinuxCon Europe 2012)

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By Alberto García. Adding Linux support for industrial hardware entails a number of problems not usually found in consumer devices. In most cases they are installed in critical environments with limited availability, where fixing bugs, developing new features and foreseeing possible fault conditions is often a hard task. Using the support of industrial devices in the Linux kernel, the presentation will show how to use QEMU to solve these issues, improve the robustness of the device driver and speed up its development. People interested in ways to write and test software and hardware using virtualization technologies will find this talk useful, in particular hackers working in testing, device drivers and hardware development.

Technology Business

Industrial hardware and QEMU

LinuxCon Europe 2012, Barcelona
Alberto Garcia <agarcia@igalia.com>

Industrial hardware and QEMU

Introduction

Industrial hardware and QEMU

LinuxCon Europe 2012, Barcelona

About me

Who am I?
Alberto Garcia
Computer engineer, Coruña University
Working at Igalia since 2001
Experience in operating systems
Debian maintainer
Involved in Maemo and MeeGo

Industrial hardware and QEMU

LinuxCon Europe 2012, Barcelona

This talk

How to make the development of device drivers easier:
Debug problems that are hard to reproduce
Foresee points of failure
Industrial hardware as an example
Useful for any kind of hardware

Industrial hardware and QEMU

LinuxCon Europe 2012, Barcelona

Industrial hardware and QEMU

Industrial hardware

Industrial hardware and QEMU

LinuxCon Europe 2012, Barcelona

Industrial hardware

Used by:
Companies: factories,
shipyards, robotics, ...
Research laboratories
Universities

Industrial hardware and QEMU

LinuxCon Europe 2012, Barcelona

Typical features

Simple
Reliable
Well-tested technology
Expensive / hard to ﬁnd
Hard to replace
Sometimes designed ad-hoc

Industrial hardware and QEMU

LinuxCon Europe 2012, Barcelona

Types of industrial hardware

ADCs, DACs
Waveform Generators
Time to digital converters
Communications: serial
ports, ﬁeldbus

Industrial hardware and QEMU

LinuxCon Europe 2012, Barcelona

What it is used for

Actuators
Sensors
Control systems

Industrial hardware and QEMU

LinuxCon Europe 2012, Barcelona

Examples

Struck SIS3320-250 8 channel ADC

Industrial hardware and QEMU

LinuxCon Europe 2012, Barcelona

Industrial hardware and QEMU

Challenges

Industrial hardware and QEMU

LinuxCon Europe 2012, Barcelona

Challenges of developing for this hardware

Limited availability
Bugs in the production environment cannot be reproduced
in the laboratory
Difﬁcult to debug on-site
Narrow time windows
Dangerous environment

Industrial hardware and QEMU

LinuxCon Europe 2012, Barcelona

Challenges of developing for this hardware

Industrial hardware and QEMU

LinuxCon Europe 2012, Barcelona

Debugging

Is it a problem in the driver or in the device?
Is the ﬁrmware faulty? Is it wrongly loaded?
Is the hardware damaged?
How can we reproduce the bug?
Do we have easy access to the environment?
Is it remotely located?

Industrial hardware and QEMU

LinuxCon Europe 2012, Barcelona

Industrial hardware and QEMU

Using virtualization to make
things easier

Industrial hardware and QEMU

LinuxCon Europe 2012, Barcelona

QEMU

Machine emulator and virtualizer
Supports multiple architectures
Can be accelerated using KVM
Free software
Flexible

Industrial hardware and QEMU

LinuxCon Europe 2012, Barcelona

How QEMU can help us

We can emulate the device we’re working with
Even if the hardware doesn’t exist yet!
Useful not just for software:
Develop hardware and its driver in parallel

Simulate hard to reproduce conditions
Force hardware errors or other uncommon situations
Foresee potential points of failure
Make the driver more reliable

Industrial hardware and QEMU

LinuxCon Europe 2012, Barcelona

Hardware we’ve worked with

Simple PCIe FMC Carrier
(SPEC)

Industrial hardware and QEMU

FMC Time to Digital Converter

LinuxCon Europe 2012, Barcelona

How to create new devices in QEMU

Industrial hardware and QEMU

LinuxCon Europe 2012, Barcelona

Emulating the device

Industrial hardware and QEMU

LinuxCon Europe 2012, Barcelona

Industrial hardware and QEMU

Testing our drivers

Industrial hardware and QEMU

LinuxCon Europe 2012, Barcelona

Tests

Create a set of tests for the device
Tests can “talk” to QEMU and inject errors or force other
conditions
Detect problems before the changes are put into
production

Industrial hardware and QEMU

LinuxCon Europe 2012, Barcelona

Test environment

Framework written in python
Simple process:
The virtual machine is started
The test environment is set up
Tests are run
The results are compared with the expected values

Industrial hardware and QEMU

LinuxCon Europe 2012, Barcelona

Unattended testing

Run QEMU without user interaction
No display necessary
Select the kernel that you want to boot
Log all messages, compare them against expected values
Easily share ﬁles between both sides
Detect when the system crashes

Industrial hardware and QEMU

LinuxCon Europe 2012, Barcelona

Running the tests

Industrial hardware and QEMU

LinuxCon Europe 2012, Barcelona

Continuous integration

We can run tests automatically when the driver is updated
Also if the hardware specs change
Detect regressions more easily

Industrial hardware and QEMU

LinuxCon Europe 2012, Barcelona

Industrial hardware and QEMU

Conclusions

Industrial hardware and QEMU

LinuxCon Europe 2012, Barcelona

Overall beneﬁts

No need to have the actual hardware
You can also help the development of the hardware
Hardware and software can be developed in parallel

Distributed teams
More stable drivers
Test changes before they are deployed
Faster development

Continuous integration
Contribute to QEMU

Industrial hardware and QEMU

LinuxCon Europe 2012, Barcelona

Industrial hardware and QEMU

Questions & Answers

Industrial hardware and QEMU

LinuxCon Europe 2012, Barcelona

Industrial hardware and QEMU

Thank you!

Industrial hardware and QEMU

LinuxCon Europe 2012, Barcelona

Images used in this presentation

http://www.flickr.com/photos/9197427@N06/2885827751
http://www.flickr.com/photos/
twosevenoneonenineeightthreesevenatenzerosix/7848902444/
http://www.flickr.com/photos/altemark/273968506/
http://www.flickr.com/photos/11304375@N07/2046228644/
http://www.ohwr.org/projects/spec/wiki
http://www.ohwr.org/projects/fmc-tdc/wiki

Industrial hardware and QEMU

LinuxCon Europe 2012, Barcelona

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InduSoft Web Studio is an HMI/SCADA software established in 1997 in the US that is now part of Schneider Electric. It has a customer-focused culture and was a pioneer in developing technologies like Windows CE support, web-based solutions, XML integration, and OPC UA support. It has offices worldwide and supports various industries. InduSoft Web Studio offers mobility, portability across operating systems, open architecture, and security. It allows developers to design applications once and deploy them on multiple hardware platforms.

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Introduction to InduSoft Web Studio 8.1 + SP5

AVEVA

InduSoft Web Studio is an HMI/SCADA software established in 1997. It has a customer-focused culture and was a pioneer in developing solutions for various operating systems. It has worldwide offices and supports many industries. The software uses an open-standard architecture and allows users to develop a project once and deploy it on multiple devices and operating systems. It offers flexibility, security, and integration capabilities.

InTouch Machine Edition: Overview

Wonderware InTouch Machine Edition

The document provides an overview of InTouch Machine Edition, an HMI software for machines and remote units. The agenda includes a product overview, demonstrations of reference architectures including a single-machine, plant-wide and geographically distributed configuration, and a live demonstration. Key features highlighted are integration with the Wonderware portfolio, hardware independence, communication with most PLCs, and the Windows Embedded operating systems. The summary restates that InTouch Machine Edition is a complete machine HMI solution that can be integrated into higher-level SCADA systems and provides machine-level supervision and logic.

Introduction to InduSoft Web Studio 8.1 + SP3

AVEVA

InduSoft Web Studio is an HMI/SCADA software established in 1997 that has pioneered many technologies. It has a customer-focused culture and is part of AVEVA. It has worldwide offices and supports many protocols and platforms, providing solutions for various industries. It offers choice through its licensing and supports developers and OEMs through its flexible architecture and investment protection.

Introduction to InduSoft Web Studio 8.1

AVEVA

Training for New Users

AVEVA

The document provides an overview of InduSoft Web Studio v7.0, a HMI and SCADA software, outlining its new features such as enhanced security, multi-language support, and updated drivers, as well as the company's global presence, vision, and various resources and marketing initiatives available for users. It also discusses InduSoft's license levels and options for contacting the company for additional information or assistance.

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Introduction to InduSoft Web Studio 8.0 + SP1

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We work and live in the modern world. Surely such an integral piece of our day-to-day life is being built and maintained in a way that ensures it will last? Unfortunately this isn’t the case. The current system funding access to the web is fragile, fractured and unsustainable. In this talk, I’ll give an overview of the current state of things, how we currently fund the web, why this is a problem, and possible ways to fix this so that access to information remains stable and sustainable for future generations to come. Web Engines Hackfest 2024 https://webengineshackfest.org/2024

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The Web engine is the most important component of a Web Browser, enabling developers to harness the power of the Web Platform to build their applications. However, Web Browsers are not the only type of applications that can be built with Web Engines, which can also be used to develop other types of applications using the same Web-based technologies, but for a different type of use cases other than "browsing the Web". These use cases can cover a wide range of situations outside of the traditional desktop or mobile environments, such as the ones embedded systems are usually used for (e.g. set-top-boxes, smart home appliances, GPS navigation devices, or in-car/in-flight infotainment systems, to name a few). And in those situations it is very common to be running on boards with SoCs and a particular set of HW capabilities that make it crucial for the Web Engine to be able to tightly integrate with them. In this session we will focus on how WPE, a fully Open Source port of the WebKit Web engine for Linux-based embedded devices, can be used to adapt to the different challenges that embedded devices pose to develop end-user applications, using the power of the Web Platform underneath. (c) Embedded Open Source Summit 2024 April 16-18, 2024 Seattle, Washington (US) https://events.linuxfoundation.org/embedded-open-source-summit/ https://eoss24.sched.com/event/1aNTr/building-end-user-applications-on-embedded-devices-with-wpe-mario-sanchez-prada-igalia

Raspberry Pi 5: Challenges and Solutions in Bringing up an OpenGL/Vulkan Driv...

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The Raspberry Pi 5 was announced on October 2023. This new version of the popular embedded device comes with a new iteration of Broadcom’s VideoCore GPU platform, and was released with a fully open source driver stack, developed by Igalia. The presentation will discuss some of the major changes required to support this new Video Core iteration, the challenges we faced in the process and the solutions we provided in order to deliver conformant OpenGL ES and Vulkan drivers. The talk will also cover the next steps for the open source Raspberry Pi 5 graphics stack. (c) Embedded Open Source Summit 2024 April 16-18, 2024 Seattle, Washington (US) https://events.linuxfoundation.org/embedded-open-source-summit/ https://eoss24.sched.com/event/1aBEx

Automated Testing for Web-based Systems on Embedded Devices

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Every day, embedded devices are becoming more powerful and capable of running more elaborate applications. Among these applications are Web-based ones, enabling to leverage features from the Web APIs to the embedded context, either through a generic browser running a traditional Web application or through a customized Web engine tightly integrated within the system. But such capabilities usually bring new challenges, like testing user interactions with the application using the embedded device's specific I/O methods, such as gestures, or inspecting Web application internals with JavaScript. In this context, using a browser automation framework such as WebDriver, which is a W3C standard supported by WebKit Web engine, allows testing Web-based applications on such devices as if the user were actually using it, alongside running custom JS code. In this session, we will cover why we need browser automation for testing on certain types of embedded devices, with a focus on WebDriver as the proposed tool to achieve that goal. We will also discuss WebDriver's main features and limitations, as well as other possible approaches and frameworks that could be considered for this kind of task. (c) Embedded Open Source Summit 2024 April 16-18, 2024 Seattle, Washington (US) https://events.linuxfoundation.org/embedded-open-source-summit/ https://eoss24.sched.com/event/1aeSx/automated-testing-for-web-based-systems-on-embedded-devices-lauro-moura-igalia

Embedding WPE WebKit - from Bring-up to Maintenance

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Embedded devices have become powerful enough to run Web content a decade ago, and any modern SoC that can run Linux and includes a GPU is a potential candidate to hide a Web engine under the surface. How did it made it there? Does it only show Web content? What else can it do? The talk will cover bring-up tips to build and get WPE WebKit working on your custom embedded device and make your own simple Web browser, as well as the best practices for keeping the system up to date. No less important is integration with the rest of the system: this session will detail the possibilities that WebKit brings to the table, including how to add new JavaScript APIs which call into native code to provide tight, performant access to platform functionality. (c) Embedded Open Source Summit 2024 April 16-18, 2024 Seattle, Washington (US) https://events.linuxfoundation.org/embedded-open-source-summit/ https://eoss24.sched.com/event/1aBFQ/embedding-wpe-webkit-from-bring-up-to-maintenance-adrian-perez-de-castro-igalia

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This talk dives into how the scheduler impacts your gameplay on Linux and unveils our journey to smoother gameplay. How does task scheduling impact Linux gaming? Suboptimal task scheduling can cause stuttering while playing games on the Steam Deck game console. First, we nail down the enemy. What exactly is "stuttering," and how can we measure its impact on your gameplay? Next, we extensively analyzed the characteristics of game tasks from the scheduler’s point of view. Characterizing task behavior in Linux gaming helps to understand why some schedulers create much stuttering and others create less and to unveil the secrets behind smooth vs. choppy performance. Lastly, we will share our progress on the optimized scheduler for reducing the stuttering problems in Linux gaming, especially Steam Deck. We implemented the scheduling policy based on sched_ext, a BPF-based extensible scheduling framework. (c) Open Source Summit North America 2024 April 16-18, 2024 Seatle, Washington (US) https://events.linuxfoundation.org/open-source-summit-north-america/ https://ossna2024.sched.com/event/1aBOT/optimizing-scheduler-for-linux-gaming-changwoo-min-igalia

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So, we are adding a backend for the SpiderMonkey’s codegen to enable JIT support for JavaScript running through Wasm. Sounds a bit cryptic so let’s divide it into parts. SpiderMonkey is a JavaScript engine which is used for running JavaScript inside the Firefox browser. SpiderMonkey is written in C++ and supports compilation into the Wasm module, see live demo - https://mozilla-spidermonkey.github.io/sm-wasi-demo/. However, SpiderMonkey compiled into the Wasm module supports execution of JavaScript only in the interpreter-only mode and it doesn’t support just-in-time compilation because there is no Wasm backend for that. There are backends for Arm, X86, X64 etc but there is none for Wasm. Why do we want to add support for JIT? Well, because we want speed. Right now there is no solution to run JS scripts via Wasm fast, there are only interpreters. Why does JIT improve performance? The reasons are the same for why an interpreter is slower than a compiler - because it eliminates the interpreter loop, uses a more efficient ABI and, more importantly, it can specialize polymorphic operations in JavaScript. So, we not only enable the JIT tier in SpiderMonkey for Wasm but we also provide support for inline caches. Inline caches is a mechanism for specializing the behavior of particular operations like plus or a call to specific arguments provided at runtime. With all that we can generate Wasm modules on the fly, instantiate them, and link them to provide from ~2x to ~11x speedup over the interpreter. In the talks we will cover how the whole scheme works with SpiderMonkey: 1. How to link modules on the fly into SpiderMonkey.wasm 2. How to add an exotic Wasm backend into SpiderMonkey’s supported backend line - X64, X86, Arm, Wasm 3. How to use the whole solution in the cloud instead of QuickJS 4. How to get a speedup of your JS over wasm with test data. Wasm I/O 2024 14 - 15 Mar, 2024 Barcelona https://2024.wasmio.tech/

To crash or not to crash: if you do, at least recover fast!

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What could be possibly worse that an almost unbeatable boss in a game or a tough maze that consume hours of gameplay with not much progress? How about a Linux kernel crash that makes you lose all the game progress with no apparent reason or feedback? Though rare, it is a real possibility that would make gamers quite annoyed, given that Linux is used more and more as a platform for playing games. Some technologies are available to collect logs and feedback the user in case such disastrous events happen, mostly related with kernel crashes handling mechanisms. The main ones available are kdump and pstore, but still there are work to be done in this area... In this talk we're going to present the basics about kernel crash handling, like how a kernel panic might happen, how to deal with that (with an overall discussion about kdump and pstore techs) and the kdumpst tool, developed specially to deal with this situation on Steam Deck (and generically on Arch Linux); also we're gonna discuss some missing pieces / ideas to make it even less likely gamers need to complain that their device just got hang for no reason! FOSForums 2023 Aug 26 - Aug 27, 2023 Institute of Computing, State University of Campinas (Unicamp) Campinas, São Paulo, Brazil https://www.fosforums.org/

Implementing a Vulkan Video Encoder From Mesa to GStreamer

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8 Years of Open Drivers, including the State of Vulkan in Mesa

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Introducción a Mesa. Caso específico dos dispositivos Raspberry Pi por Igalia

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Nesta charla impartida por Alejandro Piñeiro de Igalia, darase unha introdución a Mesa, librería open-source para o desenvolvemento de drivers gráficos. Explicarase a súa historia, os seus compoñentes máis importantes, que utilidades proporcionan aos desenvolvedores e unha lista de hardware ás que dan soporte. Finalmente explicarase o caso concreto do soporte proporcionado para as GPUs dos dispositivos da serie Raspberry Pi, centrándonos nas Raspberry Pi 4 e Raspberry Pi 5 Igalia é unha empresa galega, con sede na Coruña, especializada en servizos de consultoría, e que desenvolve solucións innovadoras de código aberto para un gran conxunto de plataformas de software e hardware. En Igalia traballan nas áreas máis interesantes do software de código aberto, incluídos navegadores, gráficos e multimedia. Igalia desenvolveu os controladores OpenGL ES 3.1 e Vulkan 1.2 conformes para a GPU VideoCore VII Broadcom que se fornece coa nova Raspberry Pi 5. Alejandro Piñeiro é enxeñeiro de Software e socio en Igalia, é desenvolvedor de Software Libre desde 2004. A súa experiencia inclúe unha variedade de proxectos de GNOME e freedesktop.org, enfocándose desde 2015 en Mesa, especificamente os drivers Intel e Broadcom. É un dos responsables do desenvolvemento do controlador Broadcom Vulkan para Raspberry Pi 4 & 5. Máis información en https://aindustriosa.org/Mesa/ Esta actividade está patrocinada pola Xunta de Galicia e pola Axencia Para a Modernización Tecnolóxica (AMTEGA). (c) A Industriosa https://aindustriosa.org 28 de Outubro (Vigo)

2023 in Chimera Linux

Igalia

Chimera Linux is a novel Linux distribution built around FreeBSD core tools and the LLVM toolchain. Since its initial launch in 2021, it has made a lot of progress and is now in alpha stage. The system can be deployed on a wide array of hardware and many people are using it as their desktop system; it works on x86_64, AArch64, POWER (little and big endian) as well as RISC-V and by now comes with thousands of packages. While trying to be practical, Chimera is also highly hardened, partly thanks to the LLVM toolchain, rendering it immune to various security issues other distros are vulnerable to. It has transparent and robust infrastructure, ensuring smooth deployment of packages. We are also developing various new tooling that the whole ecosystem can benefit from, including the Turnstile session tracker. Service management is based around Dinit, a modern, supervising system; we maintain and create a variety of tooling around it, trying to break the existing status quo with systemd, while abandoning legacy approaches. 2023 has seen several major milestones, so I will focus on these, while also giving a short overview so that people unfamiliar with the system don't feel lost. I will also explain how our work benefits the entire Linux ecosystem, as well as beyond. (c) FOSDEM 2024 3 & 4 February 2024 https://fosdem.org/2024/schedule/event/fosdem-2024-2524-2023-in-chimera-linux/

Building a Linux distro with LLVM

Igalia

For the last 3 years, I've been building a complete Linux distribution, Chimera Linux (https://chimera-linux.org) using solely LLVM as its system toolchain - that means Clang, compiler-rt, and libc++, alongside its other tooling. Right now, it is a complete desktop system that is already used by many, with a familiar GNOME interface and thousands of packages, targeting 5 CPU architectures. In this talk I would like to focus on my experiences using the toolchain, what obstacles got in the way, how I dealt with them, the issues that are still left and I would like to see addressed, the many benefits using LLVM gave the project, and overall give the audience an insight into practical deployment of LLVM in a project where it isn't simply a drop-in alternative to GCC. (c) FOSDEM 2024 3 & 4 February 2024 https://fosdem.org/2024/schedule/event/fosdem-2024-2555-building-a-linux-distro-with-llvm/

turnip: Update on Open Source Vulkan Driver for Adreno GPUs

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Graphics stack updates for Raspberry Pi devices

Igalia

This talk will show the efforts done in the Open-Source graphics stack for supporting Raspberry Pi devices. Although the talk will focus on the recently launched new Raspberry Pi 5, we will show the improvements done for previous generations of the Raspberry Pi hardware. Raspberry Pi 5 has available FLOSS GPU drivers on product launch, exposing OpenGL-ES 3.1 and Vulkan 1.2. We'll go through the changes needed to enable desktop OpenGL 3.1 on RPi4/5. We will also review the changes done to the kernel driver to expose the RPi5 capabilities and the new GPU stats support for RPi4/5. Finally, we will show the work done to use Wayfire as the default Wayland compositor on the Raspberry Pi OS. - https://www.mesa3d.org/ - https://www.raspberrypi.com/ - https://wayfire.org/ (c) FOSDEM 2024 3 & 4 February 2024 https://fosdem.org/2024/schedule/event/fosdem-2024-2841-graphics-stack-updates-for-raspberry-pi-devices/

Delegated Compositing - Utilizing Wayland Protocols for Chromium on ChromeOS

Igalia

This talk will cover our experience in utilizing Wayland subsurfaces and implementing delegated compositing for Chromium on ChromeOS. Several concepts will be covered - from overlay making decision in Chromium/Viz to design and implementation of custom Wayland protocols, which were required to pass frame data as overlays via Wayland and reconstruct that frame on the Wayland server side. (c) FOSDEM 2024 3 & 4 February 2024 https://fosdem.org/2024/schedule/event/fosdem-2024-3177-delegated-compositing-utilizing-wayland-protocols-for-chromium-on-chromeos/

MessageFormat: The future of i18n on the web

Igalia

Internationalization in JavaScript and on the web platform is very complicated, but also vastly important for us developers in order to build accessible and intelligible interfaces. Thankfully, Unicode Consortium's MessageFormat working group and TC39 have been hard at work standardizing the next generation of i18n tooling that aims to unify analogous non-standard tools in use today while approaching this problem from a fresh perspective. Join me along this tour of i18n in JavaScript, discover some of the newest additions to the toolkit and learn about the ongoing MessageFormat proposal and how it aims to radically improve the developer experience. (c) FOSDEM 2024 3 & 4 February 2024 https://fosdem.org/2024/schedule/event/fosdem-2024-2832-messageformat-the-future-of-i18n-on-the-web/

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Building automations in FME Flow can save time, money, and help businesses scale by eliminating data silos and providing data to stakeholders in real-time. One essential component to orchestrating complex automations is the use of attributes & automation parameters (both formerly known as “keys”). In fact, it’s unlikely you’ll ever build an Automation without using these components, but what exactly are they? Attributes & automation parameters enable the automation author to pass data values from one automation component to the next. During this webinar, our FME Flow Specialists will cover leveraging the three types of these output attributes & parameters in FME Flow: Event, Custom, and Automation. As a bonus, they’ll also be making use of the Split-Merge Block functionality. You’ll leave this webinar with a better understanding of how to maximize the potential of automations by making use of attributes & automation parameters, with the ultimate goal of setting your enterprise integration workflows up on autopilot.

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Developing and Testing Industrial Hardware With QEMU (LinuxCon Europe 2012)

1. Industrial hardware and QEMU LinuxCon Europe 2012, Barcelona Alberto Garcia <agarcia@igalia.com>

2. Industrial hardware and QEMU Introduction Industrial hardware and QEMU LinuxCon Europe 2012, Barcelona

3. About me Who am I? Alberto Garcia Computer engineer, Coruña University Working at Igalia since 2001 Experience in operating systems Debian maintainer Involved in Maemo and MeeGo Industrial hardware and QEMU LinuxCon Europe 2012, Barcelona

4. This talk How to make the development of device drivers easier: Debug problems that are hard to reproduce Foresee points of failure Industrial hardware as an example Useful for any kind of hardware Industrial hardware and QEMU LinuxCon Europe 2012, Barcelona

5. Industrial hardware and QEMU Industrial hardware Industrial hardware and QEMU LinuxCon Europe 2012, Barcelona

6. Industrial hardware Used by: Companies: factories, shipyards, robotics, ... Research laboratories Universities Industrial hardware and QEMU LinuxCon Europe 2012, Barcelona

7. Typical features Simple Reliable Well-tested technology Expensive / hard to ﬁnd Hard to replace Sometimes designed ad-hoc Industrial hardware and QEMU LinuxCon Europe 2012, Barcelona

8. Types of industrial hardware ADCs, DACs Waveform Generators Time to digital converters Communications: serial ports, ﬁeldbus Industrial hardware and QEMU LinuxCon Europe 2012, Barcelona

9. What it is used for Actuators Sensors Control systems Industrial hardware and QEMU LinuxCon Europe 2012, Barcelona

10. Examples Struck SIS3320-250 8 channel ADC Industrial hardware and QEMU LinuxCon Europe 2012, Barcelona

11. Industrial hardware and QEMU Challenges Industrial hardware and QEMU LinuxCon Europe 2012, Barcelona

12. Challenges of developing for this hardware Limited availability Bugs in the production environment cannot be reproduced in the laboratory Difﬁcult to debug on-site Narrow time windows Dangerous environment Industrial hardware and QEMU LinuxCon Europe 2012, Barcelona

13. Challenges of developing for this hardware Industrial hardware and QEMU LinuxCon Europe 2012, Barcelona

14. Debugging Is it a problem in the driver or in the device? Is the ﬁrmware faulty? Is it wrongly loaded? Is the hardware damaged? How can we reproduce the bug? Do we have easy access to the environment? Is it remotely located? Industrial hardware and QEMU LinuxCon Europe 2012, Barcelona

15. Industrial hardware and QEMU Using virtualization to make things easier Industrial hardware and QEMU LinuxCon Europe 2012, Barcelona

16. QEMU Machine emulator and virtualizer Supports multiple architectures Can be accelerated using KVM Free software Flexible Industrial hardware and QEMU LinuxCon Europe 2012, Barcelona

17. How QEMU can help us We can emulate the device we’re working with Even if the hardware doesn’t exist yet! Useful not just for software: Develop hardware and its driver in parallel Simulate hard to reproduce conditions Force hardware errors or other uncommon situations Foresee potential points of failure Make the driver more reliable Industrial hardware and QEMU LinuxCon Europe 2012, Barcelona

18. Hardware we’ve worked with Simple PCIe FMC Carrier (SPEC) Industrial hardware and QEMU FMC Time to Digital Converter LinuxCon Europe 2012, Barcelona

19. How to create new devices in QEMU Industrial hardware and QEMU LinuxCon Europe 2012, Barcelona

20. Emulating the device Industrial hardware and QEMU LinuxCon Europe 2012, Barcelona

21. Industrial hardware and QEMU Testing our drivers Industrial hardware and QEMU LinuxCon Europe 2012, Barcelona

22. Tests Create a set of tests for the device Tests can “talk” to QEMU and inject errors or force other conditions Detect problems before the changes are put into production Industrial hardware and QEMU LinuxCon Europe 2012, Barcelona

23. Test environment Framework written in python Simple process: The virtual machine is started The test environment is set up Tests are run The results are compared with the expected values Industrial hardware and QEMU LinuxCon Europe 2012, Barcelona

24. Unattended testing Run QEMU without user interaction No display necessary Select the kernel that you want to boot Log all messages, compare them against expected values Easily share ﬁles between both sides Detect when the system crashes Industrial hardware and QEMU LinuxCon Europe 2012, Barcelona

25. Running the tests Industrial hardware and QEMU LinuxCon Europe 2012, Barcelona

26. Continuous integration We can run tests automatically when the driver is updated Also if the hardware specs change Detect regressions more easily Industrial hardware and QEMU LinuxCon Europe 2012, Barcelona

27. Industrial hardware and QEMU Conclusions Industrial hardware and QEMU LinuxCon Europe 2012, Barcelona

28. Overall beneﬁts No need to have the actual hardware You can also help the development of the hardware Hardware and software can be developed in parallel Distributed teams More stable drivers Test changes before they are deployed Faster development Continuous integration Contribute to QEMU Industrial hardware and QEMU LinuxCon Europe 2012, Barcelona

29. Industrial hardware and QEMU Questions & Answers Industrial hardware and QEMU LinuxCon Europe 2012, Barcelona

30. Industrial hardware and QEMU Thank you! Industrial hardware and QEMU LinuxCon Europe 2012, Barcelona

31. Images used in this presentation http://www.flickr.com/photos/9197427@N06/2885827751 http://www.flickr.com/photos/ twosevenoneonenineeightthreesevenatenzerosix/7848902444/ http://www.flickr.com/photos/altemark/273968506/ http://www.flickr.com/photos/11304375@N07/2046228644/ http://www.ohwr.org/projects/spec/wiki http://www.ohwr.org/projects/fmc-tdc/wiki Industrial hardware and QEMU LinuxCon Europe 2012, Barcelona

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