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Writing Device Drivers
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Part I Designing Device Drivers for the Solaris Platform

1.  Overview of Solaris Device Drivers

2.  Solaris Kernel and Device Tree

3.  Multithreading

4.  Properties

5.  Managing Events and Queueing Tasks

6.  Driver Autoconfiguration

7.  Device Access: Programmed I/O

8.  Interrupt Handlers

9.  Direct Memory Access (DMA)

10.  Mapping Device and Kernel Memory

11.  Device Context Management

12.  Power Management

13.  Hardening Solaris Drivers

14.  Layered Driver Interface (LDI)

Part II Designing Specific Kinds of Device Drivers

15.  Drivers for Character Devices

16.  Drivers for Block Devices

17.  SCSI Target Drivers

18.  SCSI Host Bus Adapter Drivers

Introduction to Host Bus Adapter Drivers

SCSI Interface

SCSA HBA Interfaces

SCSA HBA Entry Point Summary

SCSA HBA Data Structures

scsi_hba_tran() Structure

scsi_address Structure

scsi_device Structure

scsi_pkt Structure (HBA)

Per-Target Instance Data

Transport Structure Cloning

SCSA HBA Functions

HBA Driver Dependency and Configuration Issues

Declarations and Structures

Per-Command Structure

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

tran_tgt_init() Entry Point

tran_tgt_probe() Entry Point

tran_tgt_free() Entry Point

Resource Allocation

tran_init_pkt() Entry Point

Allocation and Initialization of a scsi_pkt(9S) Structure

Allocation of DMA Resources

Reallocation of DMA Resources for Data Transfer

tran_destroy_pkt() Entry Point

tran_sync_pkt() Entry Point

tran_dmafree() Entry Point

Command Transport

tran_start() Entry Point

Interrupt Handler and Command Completion

Timeout Handler

Capability Management

tran_getcap() Entry Point

tran_setcap() Entry Point

Abort and Reset Management

tran_abort() Entry Point

tran_reset() Entry Point

tran_bus_reset() Entry Point

tran_reset_notify() Entry Point

Dynamic Reconfiguration

SCSI HBA Driver Specific Issues

Installing HBA Drivers

HBA Configuration Properties

scsi-reset-delay Property

scsi-options Property

Per-Target scsi-options

x86 Target Driver Configuration Properties

Support for Queuing

19.  Drivers for Network Devices

20.  USB Drivers

Part III Building a Device Driver

21.  Compiling, Loading, Packaging, and Testing Drivers

22.  Debugging, Testing, and Tuning Device Drivers

23.  Recommended Coding Practices

Part IV Appendixes

A.  Hardware Overview

B.  Summary of Solaris DDI/DKI Services

C.  Making a Device Driver 64-Bit Ready

D.  Console Frame Buffer Drivers


SCSI Interface

SCSA is the DDI/DKI programming interface for the transmission of SCSI commands from a target driver to a host adapter driver. By conforming to the SCSA, the target driver can easily pass any combination of SCSI commands and sequences to a target device. Knowledge of the hardware implementation of the host adapter is not necessary. Conceptually, SCSA separates the building of a SCSI command from the transporting of the command with data to the SCSI bus. SCSA manages the connections between the target and HBA drivers through an HBA transportlayer, as shown in the following figure.

Figure 18-1 SCSA Interface

Diagram shows the host bus adapter transport layer between a target driver and SCSI devices.

The HBA transport layer is a software and hardware layer that is responsible for transporting a SCSI command to a SCSI target device. The HBA driver provides resource allocation, DMA management, and transport services in response to requests made by SCSI target drivers through SCSA. The host adapter driver also manages the host adapter hardware and the SCSI protocols necessary to perform the commands. When a command has been completed, the HBA driver calls the target driver's SCSI pkt command completion routine.

The following example illustrates this flow, with emphasis on the transfer of information from target drivers to SCSA to HBA drivers. The figure also shows typical transport entry points and function calls.

Figure 18-2 Transport Layer Flow

Diagram shows how commands flow through the HBA transport layer.