extensible-host-controler-interface-usb-xhci-1.1（解密有书签）.pdf_xhci_disable_slot

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eXtensible Host Controller Interface for

Universal Serial Bus

(xHCI)

Requirements Specification

November 2017

Revision 1.1

Contents

1 Preface ....................................................................................................................................................................................... 22

1.1 Objective of Specification ............................................................................................................................... 22

1.2 Scope of Document ........................................................................................................................................... 22

1.3 Document Organization .................................................................................................................................. 22

1.4 References ............................................................................................................................................................. 23

1.5 Index ......................................................................................................................................................................... 24

1.6 Terms and Abbreviations ................................................................................................................................ 26

1.7 Compliance ............................................................................................................................................................ 43

1.8 Documentation Conventions ........................................................................................................................ 43

1.8.1 Capitalization.................................................................................................................................. 43

1.8.2 Bold Text .......................................................................................................................................... 43

1.8.3 Italic Text .......................................................................................................................................... 43

1.8.4 Numbers and Number Bases .................................................................................................. 43

1.8.5 Implementation Notes ............................................................................................................... 44

1.8.6 Word Usage .................................................................................................................................... 44

1.8.7 Pseudo Code .................................................................................................................................. 44

1.8.8 Other Notation ............................................................................................................................... 45

2 Introduction ............................................................................................................................................................................. 46

2.1 Motivation .............................................................................................................................................................. 46

2.2 Goals ......................................................................................................................................................................... 47

2.3 Key features........................................................................................................................................................... 47

2.4 xHCI Product Compliance ............................................................................................................................... 49

3 Architectural Overview ....................................................................................................................................................... 50

3.1 Interface Architecture ....................................................................................................................................... 53

3.2 xHCI Data Structures ......................................................................................................................................... 56

3.2.1 Device Context Base Address Array .................................................................................... 56

3.2.2 Device Context ............................................................................................................................... 56

3.2.3 Slot Context .................................................................................................................................... 57

3.2.4 Endpoint Context ......................................................................................................................... 57

3.2.5 Input Context .................................................................................................................................. 59

3.2.6 Rings ................................................................................................................................................... 60

3.2.7 Transfer Request Block ............................................................................................................. 61

3.2.8 Scatter/Gather Transfers .......................................................................................................... 63

3.2.9 Control Transfers ......................................................................................................................... 65

3.2.10 Bulk and Interrupt Transfers ................................................................................................... 66

3.2.11 Isoch Transfers .............................................................................................................................. 66

3.3 Command Interface ........................................................................................................................................... 69

3.3.1 No Op ................................................................................................................................................. 70

3.3.2 Enable Slot ...................................................................................................................................... 70

3.3.3 Disable Slot ..................................................................................................................................... 71

3.3.4 Address Device .............................................................................................................................. 71

3.3.5 Configure Endpoint ..................................................................................................................... 72

3.3.6 Evaluate Context ........................................................................................................................... 73

3.3.7 Reset Endpoint .............................................................................................................................. 73

3.3.8 Stop Endpoint ................................................................................................................................ 74

3.3.9 Set TR Dequeue Pointer ............................................................................................................ 74

3.3.10 Reset Device ................................................................................................................................... 74

3.3.11 Force Event ..................................................................................................................................... 74

3.3.12 Negotiate Bandwidth .................................................................................................................. 74

3.3.13 Set Latency Tolerance Value .................................................................................................. 75

3.3.14 Get Port Bandwidth ..................................................................................................................... 75

3.3.15 Force Header .................................................................................................................................. 75

3.4 General Information .......................................................................................................................................... 75

3.5 Root Hub Management .................................................................................................................................... 76

3.6 xHCI Device Enumeration ............................................................................................................................... 76

4 Operational Model ............................................................................................................................................................... 77

4.1 Command Operation ........................................................................................................................................ 77

4.2 Host Controller Initialization ......................................................................................................................... 77

4.3 USB Device Initialization .................................................................................................................................. 79

4.3.1 Resetting a Root Hub Port ........................................................................................................ 84

4.3.2 Device Slot Assignment ............................................................................................................. 84

4.3.3 Device Slot Initialization ............................................................................................................ 85

4.3.4 Address Assignment ................................................................................................................... 86

4.3.5 Device Configuration .................................................................................................................. 86

4.3.6 Setting Alternate Interfaces ..................................................................................................... 87

4.3.7 Low-Speed/Full-Speed Device Support ............................................................................ 90

4.3.8 Bandwidth Management ........................................................................................................... 90

4.4 Device Detach ....................................................................................................................................................... 90

4.5 Device Slot Management ................................................................................................................................ 91

4.5.1 Device Context Index .................................................................................................................. 92

4.5.2 Slot Context Initialization ......................................................................................................... 93

4.5.3 Slot States ........................................................................................................................................ 94

4.5.4 USB Standard Device Request to xHCI Command Mapping .................................... 99

4.6 Command Interface ........................................................................................................................................ 100

4.6.1 Command Ring Operation .................................................................................................... 100

4.6.2 No Op .............................................................................................................................................. 103

4.6.3 Enable Slot ................................................................................................................................... 104

4.6.4 Disable Slot .................................................................................................................................. 105

4.6.5 Address Device ........................................................................................................................... 107

4.6.6 Configure Endpoint .................................................................................................................. 111

4.6.7 Evaluate Context ........................................................................................................................ 123

4.6.8 Reset Endpoint ........................................................................................................................... 125

4.6.9 Stop Endpoint ............................................................................................................................. 129

4.6.10 Set TR Dequeue Pointer ......................................................................................................... 137

4.6.11 Reset Device ................................................................................................................................ 140

4.6.12 Force Event (Optional Normative) ..................................................................................... 142

4.6.13 Negotiate Bandwidth (Optional Normative) ................................................................. 144

4.6.14 Set Latency Tolerance Value (LTV) (Optional Normative) ...................................... 146

4.6.15 Get Port Bandwidth .................................................................................................................. 147

4.6.16 Force Header ............................................................................................................................... 150

4.7 Doorbells ............................................................................................................................................................. 151

4.8 Endpoint .............................................................................................................................................................. 153

4.8.1 Endpoint Addressing ............................................................................................................... 153

4.8.2 Endpoint Context Initialization ........................................................................................... 154

4.8.3 Endpoint Context State .......................................................................................................... 155

4.9 TRB Ring ............................................................................................................................................................... 159

4.9.1 Transfer Descriptors ................................................................................................................ 161

4.9.2 Transfer Ring Management .................................................................................................. 162

4.9.3 Command Ring Management .............................................................................................. 171

4.9.4 Event Ring Management ........................................................................................................ 172

4.10 Host Controller TRB Handling ................................................................................................................... 181

4.10.1 Transfer TRBs .............................................................................................................................. 181

4.10.2 Errors ............................................................................................................................................... 186

4.10.3 Events ............................................................................................................................................. 196

4.10.4 IOC Flag .......................................................................................................................................... 199

4.11 TRBs ....................................................................................................................................................................... 200

4.11.1 TRB Template ............................................................................................................................. 200

4.11.2 Transfer TRBs .............................................................................................................................. 202

4.11.3 Event TRBs.................................................................................................................................... 214

4.11.4 Command TRBs.......................................................................................................................... 215

4.11.5 Other TRBs ................................................................................................................................... 219

4.11.6 Vendor Defined TRB Types .................................................................................................. 223

4.11.7 TD Usage Rules .......................................................................................................................... 224

4.12 Streams ................................................................................................................................................................ 231

4.12.1 xHCI Stream Protocol .............................................................................................................. 232

4.12.2 Stream ID Management .......................................................................................................... 237

4.12.3 Evaluate Next TRB (ENT) ........................................................................................................ 241

4.13 Device Notifications ........................................................................................................................................ 242

4.13.1 Latency Tolerance Message Handling ............................................................................. 243

4.13.2 Function Wake ............................................................................................................................ 245

4.14 Managing Transfer Rings .............................................................................................................................. 246

4.14.1 General Scheduling Model .................................................................................................... 247

4.14.2 Periodic Transfer Ring Scheduling .................................................................................... 249

4.14.3 Interrupt Transfer Ring Scheduling .................................................................................. 257

4.14.4 Asynchronous Transfer Ring Scheduling ....................................................................... 260

4.15 Suspend-Resume ............................................................................................................................................ 267

4.15.1 Port Suspend ............................................................................................................................... 269

4.15.2 Port Resume ................................................................................................................................ 270

4.16 Bandwidth Management .............................................................................................................................. 274

4.16.1 Bandwidth Negotiation ........................................................................................................... 275

4.16.2 Bandwidth Domains ................................................................................................................. 277

4.17 Interrupters......................................................................................................................................................... 278

4.17.1 Interrupter Mapping ................................................................................................................. 279

4.17.2 Interrupt Moderation ............................................................................................................... 280

4.17.3 Interrupt Pin Support .............................................................................................................. 284

4.17.4 Interrupter Target Identification ........................................................................................ 285

4.17.5 Interrupt Blocking ..................................................................................................................... 286

4.18 Transfer Definition and Attributes ........................................................................................................... 287

4.18.1 No snoop ....................................................................................................................................... 287

4.18.2 No Snoop and Relaxed Ordering for USB Traffic ....................................................... 288

4.19 Root Hub .............................................................................................................................................................. 289

4.19.1 Root Hub Port State Machines ............................................................................................ 289

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