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Writing Device Drivers Oracle Solaris 11.1 Information Library |
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Writing Device Drivers Oracle Solaris 11.1 Information Library |
Part I Designing Device Drivers for the Oracle Solaris Platform
1. Overview of Oracle Solaris Device Drivers
2. Oracle Solaris Kernel and Device Tree
5. Managing Events and Queueing Tasks
7. Device Access: Programmed I/O
10. Mapping Device and Kernel Memory
13. Hardening Oracle Solaris Drivers
14. Layered Driver Interface (LDI)
Part II Designing Specific Kinds of Device Drivers
15. Drivers for Character Devices
18. SCSI Host Bus Adapter Drivers
HBA Driver Dependency and Configuration Issues
Entry Points for Module Initialization
_init() Entry Point (SCSI HBA Drivers)
_fini() Entry Point (SCSI HBA Drivers)
Autoconfiguration Entry Points
attach() Entry Point (SCSI HBA Drivers)
detach() Entry Point (SCSI HBA Drivers)
Entry Points for SCSA HBA Drivers
Target Driver Instance Initialization
Allocation and Initialization of a scsi_pkt(9S) Structure
Reallocation of DMA Resources for Data Transfer
tran_destroy_pkt() Entry Point
Interrupt Handler and Command Completion
tran_reset_notify() Entry Point
SCSI HBA Driver Specific Issues
x86 Target Driver Configuration Properties
19. Drivers for Network Devices
Part III Building a Device Driver
22. Compiling, Loading, Packaging, and Testing Drivers
23. Debugging, Testing, and Tuning Device Drivers
24. Recommended Coding Practices
B. Summary of Oracle Solaris DDI/DKI Services
C. Making a Device Driver 64-Bit Ready
As described in Chapter 17, SCSI Target Drivers, the DDI/DKI divides the software interface to SCSI devices into two major parts:
Target devices and drivers
Host bus adapter devices and drivers
Target device refers to a device on a SCSI bus, such as a disk or a tape drive. Target driver refers to a software component installed as a device driver. Each target device on a SCSI bus is controlled by one instance of the target driver.
Host bus adapter device refers to HBA hardware, such as an SBus or PCI SCSI adapter card. Host bus adapter driver refers to a software component that is installed as a device driver. Some examples are the esp driver on a SPARC machine, the ncrs driver on an x86 machine, and the isp driver, which works on both architectures. An instance of the HBA driver controls each of its host bus adapter devices that are configured in the system.
The Sun Common SCSI Architecture (SCSA) defines the interface between the target and HBA components.
Note - Understanding SCSI target drivers is an essential prerequisite to writing effective SCSI HBA drivers. For information on SCSI target drivers, see Chapter 17, SCSI Target Drivers. Target driver developers can also benefit from reading this chapter.
The host bus adapter driver is responsible for performing the following tasks:
Managing host bus adapter hardware
Accepting SCSI commands from the SCSI target driver
Transporting the commands to the specified SCSI target device
Performing any data transfers that the command requires
Collecting status
Handling auto-request sense (optional)
Informing the target driver of command completion or failure
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