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Description
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Category
solaris/driver (Hardware Support - Devices/Drivers)
Sub-Category
other
Description
An issue was encountered while implementing ACPI based device tree
reorganization according to PSARC/2009/104 for CPU power management
driver(cpudrv) and platform power management driver(ppm). In current
implementation, a special device match rule in ppm.conf is needed to
catch all cpu devices in system at boot time. A sample rule from
/platform/i86pc/kernel/drv/ppm.conf as below:
"domain_cpu-devices="/cpus/cpu@*";"
According to PSARC/2009/104, CPU relative device tree structure will be
reorganized to "/devices/fw/cpu@x" or
"/devices/fw/sb@x/processor@y/cpu@z". The syntax of device match rule
defined in ppm.conf isn't flexible enough to support above device tree
structure for CPU. So extension/enhancement to ppm driver is need here.
Frequency
Always
Regression
No
Steps to Reproduce
NA
Expected Result
Matching rule should be more flexible
Actual Result
NA
Error Message(s)
Test Case
Workaround
Additional configuration information
Modified PSARC case number from 109 to 104.
I think the comment in ppm.conf says it all:
75 # A special rule exists on x86 to catch all CPU devices by using "/" as the
76 # device path.
77 #
78 domain_cpu-devices="/";
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