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Writing Device Drivers     Oracle Solaris 11.1 Information Library
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Part I Designing Device Drivers for the Oracle Solaris Platform

1.  Overview of Oracle Solaris Device Drivers

2.  Oracle 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

Power Management Framework

Device Power Management

System Power Management

Device Power Management Model

Power Management Components

Multiple Power Management Components

Power Management States

Power Levels

Power Management Dependencies

Automatic Power Management for Devices

Device Power Management Interfaces

Busy-Idle State Transitions

Device Power State Transitions

power() Entry Point

System Power Management Model

Autoshutdown Threshold

Busy State

Hardware State

Automatic Power Management for Systems

Entry Points Used by System Power Management

detach() Entry Point

attach() Entry Point

Power Management Device Access Example

Power Management Flow of Control

Changes to Power Management Interfaces

13.  Hardening Oracle 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

19.  Drivers for Network Devices

20.  USB Drivers

21.  SR-IOV Drivers

Part III Building a Device Driver

22.  Compiling, Loading, Packaging, and Testing Drivers

23.  Debugging, Testing, and Tuning Device Drivers

24.  Recommended Coding Practices

Part IV Appendixes

A.  Hardware Overview

B.  Summary of Oracle Solaris DDI/DKI Services

C.  Making a Device Driver 64-Bit Ready

D.  Console Frame Buffer Drivers

E.  pci.conf File


Power Management Device Access Example

If power management is supported, and detach(9E) and attach(9E) are used as in Example 12-6 and Example 12-7, then access to the device can be made from user context, for example, from read(2), write(2), and ioctl(2).

The following example demonstrates this approach. The example assumes that the operation about to be performed requires a component component that is operating at power level level.

Example 12-8 Device Access

 * Block command while device is suspended by DDI_SUSPEND
while (xsp->xx_suspended)
    cv_wait(&xsp->xx_suspend_cv, &xsp->mu);
 * Mark component busy so xx_power() will reject attempt to lower power
if (pm_busy_component(dip, component) != DDI_SUCCESS) {
     * Log error and abort
if (xsp->xx_power_level[component] < level) {
    if (pm_raise_power(dip, component, level) != DDI_SUCCESS) {
         * Log error and abort

The code fragment in the following example can be used when device operation completes, for example, in the device's interrupt handler.

Example 12-9 Device Operation Completion

 * For each command completion, decrement the busy count and unstack
 * the pm_busy_component() call by calling pm_idle_component(). This
 * will allow device power to be lowered when all commands complete
 * (all pm_busy_component() counts are unstacked)
if (pm_idle_component(dip, component) != DDI_SUCCESS) {
     * Log error and abort
 * If no more outstanding commands, wake up anyone (like DDI_SUSPEND)
 * waiting for all commands to  be completed