SuperSpeed USB Developers Conference

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SuperSpeed USB

Developers Conference

San Jose, California

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Windows USB Technical Update &

Design Considerations

Lars Giusti

Senior Program Manager

Microsoft Corporation

Randy Aull

Principal Software Design Engineer

Microsoft Corporation

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Agenda

• Windows USB Architecture

• Windows 7 Investments around USB

• Microsoft’s Commitment To SuperSpeed USB

• Windows SuperSpeed USB Planning

• Windows SuperSpeed Impact to 3

rd

_{Party Drivers}

• Windows USB 3.0 Support Considerations By OS

• Call To Action

• Thank You!!!

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DST Team Mission & USB Core

Group Vision

DST Team Mission & USB Core

Group Vision

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Windows USB Architecture

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USB Hardware Trends Over A Decade

# Devices

Complexity

1998 2008

(7)

Windows 7 Pillars & USB Design

Considerations

Windows 7 Pillars & USB Design

Considerations

Windows 7 Pillars:

• Specialized for Laptops

• Designed for Services

• Personalized Computing for Everyone

• Optimized for Entertainment

• Engineered for Ease of Ownership

Windows Device Experience Goals:

• Easy to find, install, and use the devices I care about

• The experience is simple and delightful

• Find accessories, consumables, options, & updates that make my experience better

• Easy to connect with the company that made my device

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COMMON OEM NOTEBOOK INTEGRATED USB DEVICE LIST

Finger Print Reader Bluetooth Radio Touch Pad SD Card Reader 3G Module

Near Field Communication WWAN Optical Drive Web Camera TV Tuner WiMax

(8)

Windows 7 Key USB Investments

• Timer coalescing

• I/O transfer performance optimizations

• Improvements to overall system stability

• Selective Suspend (SS) fine tuning

• Vista suspends ALL hubs behind a HC at the

same time

• New in Windows 7

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Continuing To Build On USB

Windows 7 Key Investments

Continuing To Build On USB

Windows 7 Key Investments

• Event Tracing For Windows

• Instrumentation\Logging of USB events and

error states in ETW

• Solves the issue of complexity in diagnosing USB problems

• Caveat: Capture and ordering of events is subject to change

• Minidumps

• New minidumps make debugging a crash more efficient

• We use minidumps to improve the stability of the USB

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Windows 7 USB ETW Events

• Start ETW tracing, enable USB ETW events

• Monitor USB ETW events for some amount of time (e.g., 60 seconds)

• Rundown event includes initial device suspend state

• Real-time events include suspend state change information

• Analysis can detect

• Percentage of time a device was suspended

• If a device never suspended

10 D e v ic e A D e v ic e B time time 0 0 1 0 20 30 40 50 60 1 0 20 30 40 50 60 Rundown Events suspended suspended active active active Tracing Stops

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USB Inbox Class Drivers That

Support Selective Suspend

USB Inbox Class Drivers That

Support Selective Suspend

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USB DEVICE CLASS

SS SUPPORT IN

XP

SS SUPPORT IN

VISTA

SS SUPPORT IN

WIN7

USB HID Class _YES _YES _YES USB Audio Class _NO _NO _YES USB Video Class _NO _YES _YES

USB MTP Class _NO _NO _YES

USB Smart Card Class _NO _NO _YES WPAN: Bluetooth

Radio Class _NO _YES _YES

USB Scanner Class _NO _NO _YES

WinUSB _NO _YES _YES

USB Biometric Class _NO _NO _YES

USB Sideshow _NO _YES _YES

USBHUB _NO _YES _YES

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Future Needs for USB

Increasing Bandwidth Needs

Multi-function Devices using

Multiple Transports

Reliability and Stability

Energy Efficiency (Internal Devices)

UFD as primary boot drive

Virtualization Support

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Windows SuperSpeed USB (USB

3.0) Planning

Windows SuperSpeed USB (USB

3.0) Planning

• Windows SuperSpeed USB Support is

coming…but…

• Limited SuperSpeed USB hardware available

to test and develop on

• Microsoft is targeting this support post

Windows 7 launch

• Windows SuperSpeed USB Dependencies

• Specification availability (USB3 + XHCI)

• Hardware availability

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Microsoft’s Hardware Needs

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Host Device

Prototyping _{XHCI host controller sample}_«

(for MS to develop XHCI validate tools and software) 1 Prototype analyzer for USB 3.0«

1+ Hub prototype «

2+ Native Device prototypes « 1 UASP devices prototypes «

Development _{2 Independent host controller silicon}_«

(certified by USB-IF)

1 shipping analyzer (retail quality) «

2 Independent hubs prototypes «» 3 Independent devices prototypes «» 2 Independent UASP devices prototypes «

Verification _{2 Independent shipping host controllers (unique silicon)}_» _{2 independent certified hubs}_»

2+ independent certified devices »

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USB Mass Storage Platform

Investments

USB Mass Storage Platform

Investments

• Actively Investigating Support for UASP (USB

Attached SCSI Protocol)

• Improved performance

• Actively Investigating Windows Boot Support

• Opportunity To Address User Pain Points

• Selective Suspend

• SPC Compliance

• Media Properties

• Storage PM Contact:

KiranBan @ microsoft.com

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Windows 7 Testing & Windows

Logo Kit v1.3

Windows 7 Testing & Windows

Logo Kit v1.3

• USB Device tests are part of

the system kit

• Run as part of system

certification

• Unclassified program will run

device tests

• Requested tests are being

added to the optional section

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Double Click this box for Instructions on Manually Running a USB test

1. Go to the device manager of the client machine and make a note of the VID and PID of the device you would like to tests. (If you are not running a USB test then this is probably not needed, you will have to check what other parameters are needed to run the test)

2. Go to Explorers\Job Explorer and find the test you would like to run 3. Right click on the job and select schedule

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USB 3.0 and Software

Randy Aull

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Potential Software Support

• New stack proposal based on XHCI controller

• New controller driver and hub driver may be required

• Keep new stack and legacy stack side-by-side

• Key design goals of new stack

• Maintain compatibility w/ existing function drivers &

devices

• Support USB 3.0 and 2.0 devices via XHCI

• Support booting from USB mass storage

• Efficient I/O path

• Power Efficiency

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Features in USB 3.0 Affecting

Function Drivers

Features in USB 3.0 Affecting

Function Drivers

• Streams – Allows a device to target any one of

multiple buffers queued to a single endpoint

• Function power management

• Link power management (potentially)

• Higher throughput may expose function driver

inefficiencies

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XHCI Overview

• Single host controller supports all device speeds (including SuperSpeed)

• Key points of interest

• No companion controllers

• Caches the schedules to reduce impact on battery life

• Supports SuperSpeed and Legacy Speeds

• Power management enhancements (LPM)

• Improved I/O efficiency

• Hardware virtualization enhancements

• Improved debugging over USB

• Improves experience for USB 2.0 and USB 3.0 devices

• For additional details:

• Extensible Host Controller Interface (xHCI) Draft Specification for USB 3.0

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Features in XHCI Affecting Drivers

• Power Management

• Selective Suspend motivation changed

• Link power management (LPM)

• Performance

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USB Experiences Enhanced

in Windows 7

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Container View Of MFP

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Device And Printers Folder

Easier to find and use devices

Good solution for

Multi

Multi--function devicesfunction devices

Multi

Multi--transport Solutiontransport Solution

Removable

Removable vsvs NonNon--Removable Removable Devices

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Issue 1: Multi-Transport Device

• Goal:

• Identify a unique device instance in both scenarios above

• Details

• ContainerID provides information to consolidate devices across multiple USB or other transports

• Specified in Container ID Descriptor in the BOS Descriptor Set

• 128bit globally unique ID (GUID) per device instance

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Scenario 1: Device w/ USB and Bluetooth Scenario 2: USB 3.0 Hub

USB 3.0 Core

USB 2.0 Core

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Issue 2: Compound Devices

• Goal

• Compound devices should

accurately represent the topology

• Helps identify how the user

perceives a device

• Details

• Device Removable field in the

Hub Descriptor should be accurate

• Windows Logo Test to

validate accuracy of Device Removable field

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Issue 3: Internal Devices

• Goal

• Differentiate and identify

the internal vs external

USB devices

• Details

• OEMs are integrating many

USB devices internally

• ACPI information to identify

internal vs external devices

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COMMON OEM NOTEBOOK INTEGRATED USB DEVICE LIST

Finger Print Reader Bluetooth Radio Touch Pad SD Card Reader 3G Module

Near Field Communication WWAN Optical Drive Web Camera TV Tuner WiMax

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Lars Giusti

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Microsoft’s Commitment To

SuperSpeed USB (USB 3.0)

Microsoft’s Commitment To

SuperSpeed USB (USB 3.0)

• Microsoft has developed driver support for the USB industry

standard since its inception and is committed to supporting the latest hardware technologies on the Windows platform

• Microsoft intends to deliver Windows support for hardware that

is compliant with the xHCI specification; this is a huge step forward in enabling the industry and our customers to easily connect SuperSpeed USB devices to their PCs for exciting new functionality and usages

• Extensible Host Controller Interface (xHCI) provides a

standardized method for USB 3.0 host controllers to communicate with the USB 3.0 Windows driver stack

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USB 3.0 Support In Windows

• We are currently looking at which Operating

Systems we want to support this technology

• Early input from some partners indicates they

would like us to consider supporting it on

Windows Vista and newer Windows OS

• We will gather more feedback and identify the

list of potential operating system in the near

future

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USB Call To Action

• Test your USB devices and drivers on Windows 7

• Evaluate new USB test using Windows Logo Kit Version 1.3

• Share feedback on your experience with USB on Windows 7

• USB 3.0

• Share your USB product plans with the USB core team

• Submit and pass your devices with USB-IF and Windows Logo tests

• Build your PCs with only USB devices that pass USB-IF and Windows Logo tests

• Contacts:

• USB 3.0 Core Team : usb3fb @ microsoft.com

• USB Storage Team: KiranBan @ microsoft.com

Thank you all for making USB the most useful, easy, and reliable connectivity technology ever!