Profiling the ACPICA Namespace and Event Handing
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This document summarizes a presentation about profiling the ACPI namespace and event handling. It discusses the key components of ACPICA and how it interacts with the Linux kernel. It describes how definition blocks are parsed to build the ACPI namespace, and how fixed events and general purpose events (GPEs) are handled through event detection and dispatching to handlers in the kernel or by evaluating control methods.
![3
ACPICA
• The ACPI Component Architecture (CA) is the core
of Advanced Configuration and Power Interface
(ACPI) subsystem in Linux kernel.
• The ACPICA provides the fundamental ACPI
services that are independent of any operating
system. [1]
• Mainly maintained by Intel
‒ https://github.com/acpica/acpica.git](https://image.slidesharecdn.com/profiling-the-acpica-20190919-191006013352/85/Profiling-the-ACPICA-Namespace-and-Event-Handing-3-320.jpg)
![4
ACPICA (cont.)
• ACPICA’s services include an AML
parser/interpreter, ACPI namespace management,
ACPI table management and event handling [1].
• The OS Services Layer (OSL) is a conversion layer
between the OS-independent ACPICA to a particular
host operating system. [1]](https://image.slidesharecdn.com/profiling-the-acpica-20190919-191006013352/85/Profiling-the-ACPICA-Namespace-and-Event-Handing-4-320.jpg)
![12
ACPI host and ACPICA
• OSL in Linux Kernel: drivers/acpi/osl.c
• ACPICA-to-host: All ACPICA-to-host interactions
pass through the OSL via direct calls to the AcpiOs*
interfaces from ACPICA. [1]
• Host-to-ACPICA
‒ Synchronous: the host making direct calls to the various
public Acpi* interfaces. [1]
‒ Asynchronous: The host calls ACPICA to install an
appropriate handler at initialization time. This handler is
then invoked by ACPICA whenever the requested event
occurs. (handle fixed events or GPE) [1]](https://image.slidesharecdn.com/profiling-the-acpica-20190919-191006013352/85/Profiling-the-ACPICA-Namespace-and-Event-Handing-12-320.jpg)
![16
ACPI Tables
• Definition blocks tables
‒ AML (ACPI Machine Language) format
‒ DSDT (differentiated system description table), SSDT
(secondary system description tables)
• Data tables
‒ TDL (Table Definition Language)
‒ FADT, MADT, ECDT, SRAT, etc. - essentially any table
other than a DSDT or SSDT. [2]
• The iasl tool supports AML and TDL](https://image.slidesharecdn.com/profiling-the-acpica-20190919-191006013352/85/Profiling-the-ACPICA-Namespace-and-Event-Handing-16-320.jpg)
![17
ACPI Namespace
• The ACPI Namespace is a large data structure that
is constructed and maintained by the ACPICA
Subsystem component. [1]
• Constructed primarily from the AML defined within
an ACPI Differentiated System Description Table
(DSDT), the namespace contains a hierarchy of
named ACPI objects. [1]
root
Namespace
node node](https://image.slidesharecdn.com/profiling-the-acpica-20190919-191006013352/85/Profiling-the-ACPICA-Namespace-and-Event-Handing-17-320.jpg)
![19
Definition blocks, Namespace and
ACPI devices
[1]Load](https://image.slidesharecdn.com/profiling-the-acpica-20190919-191006013352/85/Profiling-the-ACPICA-Namespace-and-Event-Handing-19-320.jpg)
![20
Definition blocks, Namespace and
ACPI devices
[1]Load
[2]](https://image.slidesharecdn.com/profiling-the-acpica-20190919-191006013352/85/Profiling-the-ACPICA-Namespace-and-Event-Handing-20-320.jpg)
![21
Definition blocks, Namespace and
ACPI devices
[1]Load
[2]
[3] Parse](https://image.slidesharecdn.com/profiling-the-acpica-20190919-191006013352/85/Profiling-the-ACPICA-Namespace-and-Event-Handing-21-320.jpg)
![22
Definition blocks, Namespace and
ACPI devices
[1]Load
[2]
[3] Parse
[4] handle](https://image.slidesharecdn.com/profiling-the-acpica-20190919-191006013352/85/Profiling-the-ACPICA-Namespace-and-Event-Handing-22-320.jpg)
![23
Definition blocks, Namespace and
ACPI devices
[1]Load
[2]
[3] Parse
PCI
CPU
Memory
Companion
Companion
Companion
PCI
CPU
Memory
[4] handle](https://image.slidesharecdn.com/profiling-the-acpica-20190919-191006013352/85/Profiling-the-ACPICA-Namespace-and-Event-Handing-23-320.jpg)
![38
Event types in ACPICA
• ACPI Fixed Events and General Purpose Events
(GPEs)
‒ System Control Interrupts (SCIs) be generated
• Event types in control method
‒ Notify events that are generated via the execution of the
ASL Notify keyword in a control method. [1]
‒ Events that are caused by accesses to an address space
or operation region during the execution of a control
method. [1]](https://image.slidesharecdn.com/profiling-the-acpica-20190919-191006013352/85/Profiling-the-ACPICA-Namespace-and-Event-Handing-38-320.jpg)
![41
ACPI Events
[1]Set](https://image.slidesharecdn.com/profiling-the-acpica-20190919-191006013352/85/Profiling-the-ACPICA-Namespace-and-Event-Handing-41-320.jpg)
![42
ACPI Events
[1]Set
[2]SCI[2]SCI](https://image.slidesharecdn.com/profiling-the-acpica-20190919-191006013352/85/Profiling-the-ACPICA-Namespace-and-Event-Handing-42-320.jpg)
![43
ACPI Events
[1]Set
[2]SCI[2]SCI
[3]
[3]Read
Clear](https://image.slidesharecdn.com/profiling-the-acpica-20190919-191006013352/85/Profiling-the-ACPICA-Namespace-and-Event-Handing-43-320.jpg)
![44
ACPI Events (Fixed Event)
[1]Set
[2]SCI[2]SCI
[3]
[3]Read
Clear
[4] Button](https://image.slidesharecdn.com/profiling-the-acpica-20190919-191006013352/85/Profiling-the-ACPICA-Namespace-and-Event-Handing-44-320.jpg)
![45
ACPI Events (Fixed Event)
[1]Set
[2]SCI[2]SCI
[3]
[3]Read
Clear
[4] Button
Input [5] input
[5]Keycode](https://image.slidesharecdn.com/profiling-the-acpica-20190919-191006013352/85/Profiling-the-ACPICA-Namespace-and-Event-Handing-45-320.jpg)
![46
ACPI Events (GPE)
[1]Set
[2]SCI[2]SCI
[3]
[3]Read
Clear
_Exx _Lxx
_GPE](https://image.slidesharecdn.com/profiling-the-acpica-20190919-191006013352/85/Profiling-the-ACPICA-Namespace-and-Event-Handing-46-320.jpg)
![47
ACPI Events (GPE)
[1]Set
[2]SCI[2]SCI
[3]
[3]Read
Clear
[4]
_Exx _Lxx
_GPE
[5]](https://image.slidesharecdn.com/profiling-the-acpica-20190919-191006013352/85/Profiling-the-ACPICA-Namespace-and-Event-Handing-47-320.jpg)
![48
ACPI Events (GPE)
[1]Set
[2]SCI[2]SCI
[3]
[3]Read
Clear
[4]
_Exx _Lxx
_GPE
[5]
[6]Access
Address space
[6] Notify](https://image.slidesharecdn.com/profiling-the-acpica-20190919-191006013352/85/Profiling-the-ACPICA-Namespace-and-Event-Handing-48-320.jpg)
![49
ACPI Events (GPE)
[1]Set
[2]SCI[2]SCI
[3]
[3]Read
Clear
[4]
_Exx _Lxx
_GPE
[5]
[6]Access
Address space
[6] NotifyPCI
CPU
Memory
PCI
CPU
Memory
Interactive
Interactive
interactive](https://image.slidesharecdn.com/profiling-the-acpica-20190919-191006013352/85/Profiling-the-ACPICA-Namespace-and-Event-Handing-49-320.jpg)
![50
Fixed Events
• Fixed Events
‒ ACPI events that have a predefined meaning in the ACPI
specification. e.g. power button, timer overflows.
‒ These events are handled directly by the OS handlers. [2]
‒ ACPI register: PM1 = PM1a | PM1b
‒ PM1x_STS.8: PWRBTN_STS
‒ PM1x_STS.9: SLPBTN_STS
‒ PM1x_STS.10: RTC_STS
….](https://image.slidesharecdn.com/profiling-the-acpica-20190919-191006013352/85/Profiling-the-ACPICA-Namespace-and-Event-Handing-50-320.jpg)
![51
ACPICA
Events (fixed)
events
1) AcpiEvFixedEventDetect
1.3) AcpiEvFixedEventDispatch
2) AcpiEvGpeDetect
3) AcpiEvSciDispatch
Kernel
0) acpi_ev_sci_xrupt_handler
(AcpiEvSciXruptHandler)
1.1) AcpiHwRegisterRead
Kernel/irq
drivers/acpi
1.2) acpi_global_event_handler
(AcpiGbl_GlobalEventHandler)
bus.csysfs.c
1.3.1) acpi_device_fixed_event
(AcpiGbl_FixedEventHandlers[Event].Handle)
button.c
1.3.1.x) notify
hardware](https://image.slidesharecdn.com/profiling-the-acpica-20190919-191006013352/85/Profiling-the-ACPICA-Namespace-and-Event-Handing-51-320.jpg)
![52
GPEs
• GPEs
‒ GPEs are ACPI events that are not predefined by the ACPI
specification.
‒ These events are usually handled by evaluating control
methods, which are objects in the namespace and can
access system hardware.
‒ ACPI registers: GPE0_BLK, GPE1_BLK
‒ Control Methods: _GPE._Lxx, _GPE._Exx
‒ X86: reference GPE0_STS register in the Intel I/O Controller Hub
(ICH) datasheet.
‒ watch -n 1 cat /sys/firmware/acpi/interrupts/gpe[012]
[0123456789ABCDEF]](https://image.slidesharecdn.com/profiling-the-acpica-20190919-191006013352/85/Profiling-the-ACPICA-Namespace-and-Event-Handing-52-320.jpg)
![58
Reference
• [1] ACPI Component Architecture User Guide and
Programmer Reference Revision 6.2, May 31, 2017
• [2] Advanced Configuration and Power Interface
(ACPI) Specification Version 6.3, January 2019](https://image.slidesharecdn.com/profiling-the-acpica-20190919-191006013352/85/Profiling-the-ACPICA-Namespace-and-Event-Handing-58-320.jpg)
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Profiling the ACPICA Namespace and Event Handing
- 1. Profiling the ACPICA Namespace and Event Handing September, 2019, SUSE Labs Conference 2019, Špindlerův mlýn Joey Lee SUSE Labs Taipei [email protected]
- 2. 2 Agenda • Components in ACPICA • ACPICA in Linux Kernel • Definition blocks and ACPI Namespace • The Fixed event and GPE handling • Q&A
- 3. 3 ACPICA • The ACPI Component Architecture (CA) is the core of Advanced Configuration and Power Interface (ACPI) subsystem in Linux kernel. • The ACPICA provides the fundamental ACPI services that are independent of any operating system. [1] • Mainly maintained by Intel ‒ https://github.com/acpica/acpica.git
- 4. 4 ACPICA (cont.) • ACPICA’s services include an AML parser/interpreter, ACPI namespace management, ACPI table management and event handling [1]. • The OS Services Layer (OSL) is a conversion layer between the OS-independent ACPICA to a particular host operating system. [1]
- 5. 5 ACPI Namespace and Event handing • ACPI Namespace ‒ A static tree structure reflects to AML definition blocks which is an abstract layer of hardware devices in platform. • ACPI Event handing ‒ ACPICA provides event mechanisms to define and to handle the dynamic behavior at runtime.
- 7. 7 ACPICA components • ACPI fundamental: Namespace Management, Table Management, Event Handling, Resource Manager, Hardware Management, Utilities • AML interpreter: Dispatcher, Executer, Parser, Disassembler, Debugger • OS Services Layer (OSL) ‒ ACPICA implements OSL for user space of Unix, Linux, Windows and BSD. ‒ Linux Kernel’s ACPI subsystem maintains a OSL (drivers/acpi/osl.c) to adapt ACPICA.
- 8. 8 Kernel or Userland ACPICA Core Components ACPICA root Namespace AML Interpreter Tables node node Events OSL Parser Resources Hardware Utilities Disassembler Dispatcher Executer Debuggernode node node AcpiOs* Acpi*Acpi* Acpi* Acpi* Acpi* Acpi*
- 9. 9 ACPICA tools • iasl: ASL compiler / AML decompiler • Tools: acpidump, acpixtract, acpinames, acpiexec... • Tests: ASL grammar validation Test Suite (ASLTS), ASL test cases • Generate: generation tools, release tools
- 10. 10 ACPICA and Tools Components Namespace AML Interpreter Tables Events OSL Parser Resources Hardware Utilities Disassembler Dispatcher Executer Debugger Tools acpidump acpiexec Compiler TestsGenerate release linux msvc unix msvc9 efi acpixtract root node node node node node iasl osunix* oslinux* oswin* osbsd* efi* aslts Acpi*Acpi* AcpiOs*
- 11. ACPICA in Linux Kernel
- 12. 12 ACPI host and ACPICA • OSL in Linux Kernel: drivers/acpi/osl.c • ACPICA-to-host: All ACPICA-to-host interactions pass through the OSL via direct calls to the AcpiOs* interfaces from ACPICA. [1] • Host-to-ACPICA ‒ Synchronous: the host making direct calls to the various public Acpi* interfaces. [1] ‒ Asynchronous: The host calls ACPICA to install an appropriate handler at initialization time. This handler is then invoked by ACPICA whenever the requested event occurs. (handle fixed events or GPE) [1]
- 13. 13 OSL Services • Environmental: enable acpi mode • Memory Management: mm • Multitasking Support • Mutual Exclusion and Synchronization • Interrupt handling: IRQ • Address Spaces • Stream I/O: printk
- 14. 14 Platform Kernel ACPICA in Linux Kernel Firmware ACPI Tables RSDP XSDT Hardware ACPI ACPICA root bus driver device Namespace AML Interpreter Tables node node Event FADT DSDT SSDT2SSDT1 Resource Hardware mm OSL resource printkEFIIRQqueue PCI CPU Memory pm AcpiOs* Acpi* Acpi*
- 15. Definition blocks and ACPI Namespace
- 16. 16 ACPI Tables • Definition blocks tables ‒ AML (ACPI Machine Language) format ‒ DSDT (differentiated system description table), SSDT (secondary system description tables) • Data tables ‒ TDL (Table Definition Language) ‒ FADT, MADT, ECDT, SRAT, etc. - essentially any table other than a DSDT or SSDT. [2] • The iasl tool supports AML and TDL
- 17. 17 ACPI Namespace • The ACPI Namespace is a large data structure that is constructed and maintained by the ACPICA Subsystem component. [1] • Constructed primarily from the AML defined within an ACPI Differentiated System Description Table (DSDT), the namespace contains a hierarchy of named ACPI objects. [1] root Namespace node node
- 18. 18 Definition blocks, Namespace and ACPI devices Tables OSL EFI ACPI Tables RSDP XSDT FADT DSDT SSDT2SSDT1 root Namespace AML Interpreter node node bus driver device
- 19. 19 Definition blocks, Namespace and ACPI devices [1]Load
- 20. 20 Definition blocks, Namespace and ACPI devices [1]Load [2]
- 21. 21 Definition blocks, Namespace and ACPI devices [1]Load [2] [3] Parse
- 22. 22 Definition blocks, Namespace and ACPI devices [1]Load [2] [3] Parse [4] handle
- 23. 23 Definition blocks, Namespace and ACPI devices [1]Load [2] [3] Parse PCI CPU Memory Companion Companion Companion PCI CPU Memory [4] handle
- 24. 24 Namespace Initialization • Firmware puts definition blocks tables (DSDT and SSDT*) to memory. • Table Management component loads DSDT and SSDT. ‒ OSL helps to get RSDP for loading ACPI tables • Table Management component forwards DSDT/SSDT points to Namespace Management component. • Namespace Management component requests AML interpreter to parse tables. • Base on parsing result, Namespace Management component creates ACPI namespace.
- 25. 25 ACPICA Table to Namespace tables 2) AcpiTbLoadNamespace namespace 2.1.1) AcpiNsParseTable 2.1.1.1) AcpiNsExecuteTable 3.1) AcpiNsInitOneObject 2.1) AcpiNsLoadTable 3) AcpiNsInitializeObjects 2.1.2) AcpiDsInitializeObjects 0) acpi_load_tables (AcpiLoadTables) Kernel drivers/acpi/bus.c events 1) AcpiEvInstallRegionHandlers dispatcher 2.1.1.1) AcpiPsExecuteTable parser 2.1.1.1.1) AcpiPsCreateScopeOp 2.1.1.1.5) AcpiPsParseAml 2.1.1.1.2) AcpiDsCreateWalkState 2.1.1.1.3) AcpiDsInitAmlWalk 2.1.1.1.4) AcpiDsScopeStackPush 2.1.1.1.6) AcpiDsDeleteWalkState 2.1.1.1.7) AcpiPsDeleteParseTree
- 26. 26 ACPICA Evaluate method/object namespace 1) AcpiNsValidateHandle 2) AcpiNsEvaluate 2.1) AcpiNsGetNode 2.4) AcpiNsCheckReturnValue 3) AcpiNsResolveReferences 0) acpi_evaluate_object (AcpiEvaluateObject) Kernel drivers/acpi/utils.c tables 2.2.1) AcpiTbCheckDsdtHeader dispatcher 2.2) AcpiPsExecuteMethod parser 2.2.3) AcpiPsUpdateParameterList 2.2.4) AcpiPsCreateScopeOp 2.2.7) AcpiPsParseAml 2.2.8) AcpiPsDeleteParseTree 2.2.9) AcpiPsUpdateParameterList 2.2.2) AcpiDsBeginMethodExecution 2.2.5) AcpiDsCreateWalkState 2.2.6) AcpiDsInitAmlWalk executer 2.3) AcpiExResolveNodeToValue
- 27. 27 The relation between layers
- 28. 28 The relation between layers
- 29. 29 The relation between layers
- 30. 30 The relation between layers
- 31. 31 The relation between layers
- 32. 32 The relation between layers
- 33. 33 The relation between layers
- 34. 34 The relation between layers
- 35. 35 The relation between layers
- 36. 36 Class diagram for ACPI Namespace
- 37. The Fixed event and GPE handling
- 38. 38 Event types in ACPICA • ACPI Fixed Events and General Purpose Events (GPEs) ‒ System Control Interrupts (SCIs) be generated • Event types in control method ‒ Notify events that are generated via the execution of the ASL Notify keyword in a control method. [1] ‒ Events that are caused by accesses to an address space or operation region during the execution of a control method. [1]
- 39. 39 System Control Interrupts (SCIs) • SCI ‒ IRQ9 on x86. (otherwise checking SCI_INT in FADT) • SCI handlers ‒ AcpiEvGpeXruptHandler, AcpiEvSciXruptHandler in ACPICA ‒ acpi_global_event_handler in Linux Kernel
- 40. 40 ACPI Events OSL root Namespace AML Interpreter node node bus driver device Hardware Event Platform Firmware ACPI Registers Hardware FADT PM1a IRQ GPE0 PM1b GPE1 Sleep Timer
- 44. 44 ACPI Events (Fixed Event) [1]Set [2]SCI[2]SCI [3] [3]Read Clear [4] Button
- 45. 45 ACPI Events (Fixed Event) [1]Set [2]SCI[2]SCI [3] [3]Read Clear [4] Button Input [5] input [5]Keycode
- 47. 47 ACPI Events (GPE) [1]Set [2]SCI[2]SCI [3] [3]Read Clear [4] _Exx _Lxx _GPE [5]
- 48. 48 ACPI Events (GPE) [1]Set [2]SCI[2]SCI [3] [3]Read Clear [4] _Exx _Lxx _GPE [5] [6]Access Address space [6] Notify
- 49. 49 ACPI Events (GPE) [1]Set [2]SCI[2]SCI [3] [3]Read Clear [4] _Exx _Lxx _GPE [5] [6]Access Address space [6] NotifyPCI CPU Memory PCI CPU Memory Interactive Interactive interactive
- 50. 50 Fixed Events • Fixed Events ‒ ACPI events that have a predefined meaning in the ACPI specification. e.g. power button, timer overflows. ‒ These events are handled directly by the OS handlers. [2] ‒ ACPI register: PM1 = PM1a | PM1b ‒ PM1x_STS.8: PWRBTN_STS ‒ PM1x_STS.9: SLPBTN_STS ‒ PM1x_STS.10: RTC_STS ….
- 51. 51 ACPICA Events (fixed) events 1) AcpiEvFixedEventDetect 1.3) AcpiEvFixedEventDispatch 2) AcpiEvGpeDetect 3) AcpiEvSciDispatch Kernel 0) acpi_ev_sci_xrupt_handler (AcpiEvSciXruptHandler) 1.1) AcpiHwRegisterRead Kernel/irq drivers/acpi 1.2) acpi_global_event_handler (AcpiGbl_GlobalEventHandler) bus.csysfs.c 1.3.1) acpi_device_fixed_event (AcpiGbl_FixedEventHandlers[Event].Handle) button.c 1.3.1.x) notify hardware
- 52. 52 GPEs • GPEs ‒ GPEs are ACPI events that are not predefined by the ACPI specification. ‒ These events are usually handled by evaluating control methods, which are objects in the namespace and can access system hardware. ‒ ACPI registers: GPE0_BLK, GPE1_BLK ‒ Control Methods: _GPE._Lxx, _GPE._Exx ‒ X86: reference GPE0_STS register in the Intel I/O Controller Hub (ICH) datasheet. ‒ watch -n 1 cat /sys/firmware/acpi/interrupts/gpe[012] [0123456789ABCDEF]
- 53. 53 ACPICA Events (GPE) events 1) AcpiEvFixedEventDetect 2) AcpiEvGpeDetect 2.1) AcpiEvDetectGpe 2.1.4) AcpiEvGpeDispatch 2.1.4.4.1) AcpiEvQueueNotifyRequest 3) AcpiEvSciDispatch Kernel 0) acpi_ev_sci_xrupt_handler (AcpiEvSciXruptHandler) hardware 2.1.4.4.2.2) AcpiPsExecuteMethod executer 2.1.4.4.2.3) AcpiExResolveNodeToValue Kernel/irq drivers/acpi ec.csysfs.c osl.c 2.1.1) AcpiHwRead 2.1.4.1) AcpiHwLowSetGpe 2.1.4.2) AcpiHwClearGpe 2.1.2) acpi_global_event_handler (AcpiGbl_GlobalEventHandler) 2.1.3) acpi_ec_gpe_handler (GpeHandlerInfo->Address) Kernel/workqueue queue Namespace 2.1.4.4.2.1) AcpiNsGetNode 2.1.4.4.2.4) AcpiNsCheckReturnValue 2.1.4.4.2) AcpiNsEvaluate parser 2.1.4.4) AcpiEvAsynchExecuteGpeMethod 2.1.4.3) acpi_os_execute
- 54. 54 Example: EC and _Qxx • A general-purpose event is raised from the GPE bit tied to an embedded controller, the embedded controller driver uses another naming convention defined by ACPI for the embedded controller driver to determine which control method to queue for execution. • The name of the control method to queue is always of the form _Qxx where xx is the number of the query acknowledged by the embedded controller.
- 55. 55 Class diagram for _Qxx event handling
- 56. 56 Summary • The interactive between two framework: Linux Kernel and ACPICA • ACPI Namespace: An abstract layer between hardware platform and OS • ACPI event handing: To define and handle the dynamic behavior between platform and OS
- 57. Q&A
- 58. 58 Reference • [1] ACPI Component Architecture User Guide and Programmer Reference Revision 6.2, May 31, 2017 • [2] Advanced Configuration and Power Interface (ACPI) Specification Version 6.3, January 2019
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