Bug 5737

Summary:	Software P-state coordination and ACPI 3.0 _PSD method in Linux kernel
Product:	ACPI	Reporter:	Venkatesh Pallipadi (venki)
Component:	Power-Processor	Assignee:	Venkatesh Pallipadi (venki)
Status:	CLOSED CODE_FIX
Severity:	normal	CC:	acpi-bugzilla
Priority:	P2
Hardware:	i386
OS:	Linux
Kernel Version:	2.6.14	Subsystem:
Regression:	---	Bisected commit-id:
Attachments:	patch 1/4 : P-state software coordination changes for acpi core patch 2/4 : P-state software coordination changes for acpi-cpufreq driver patch 3/4 : P-state software coordination changes for speedstep-centrino driver patch 4/4 : P-state software coordination final changes to turn on in _PDC patch 2/4 : P-state software coordination changes for acpi-cpufreq driver (rebased with 2.6.16-rc1-git6) Patch to treat hardware coordinated CPUs as independent in cpufreq

Description Venkatesh Pallipadi 2005-12-13 10:01:40 UTC

Most recent kernel where this bug did not occur:
Distribution:
Hardware Environment:
Software Environment:
Problem Description:
Linux kernel should have support for software coordination of P-states and 
support for _PSD ACPI 3.0 method.

The original patch for this was sent on the mailing list here:
http://sourceforge.net/mailarchive/forum.php?
forum_id=6102&max_rows=100&style=threaded&viewmonth=200509&viewday=13

This patch will support software coordination of P-states across logical CPUs 
in cases where CPUs share a P-state and BIOS supports the _PSD method and lets 
OS know of this P-states getting shared across CPUs.

Comment 1 Venkatesh Pallipadi 2005-12-13 10:02:58 UTC

There has been some other changes in the code being touched by the above patch 
in last two months. Below is the rebased patchset to current base kernel 
(2.6.15-rc).

Comment 2 Venkatesh Pallipadi 2005-12-14 15:05:05 UTC

Created attachment 6826 [details]
patch 1/4 : P-state software coordination changes for acpi core

Comment 3 Venkatesh Pallipadi 2005-12-14 15:06:36 UTC

Created attachment 6827 [details]
patch 2/4 : P-state software coordination changes for acpi-cpufreq driver

Comment 4 Venkatesh Pallipadi 2005-12-14 15:07:47 UTC

Created attachment 6828 [details]
patch 3/4 : P-state software coordination changes for speedstep-centrino driver

Comment 5 Venkatesh Pallipadi 2005-12-14 15:08:44 UTC

Created attachment 6829 [details]
patch 4/4 : P-state software coordination final changes to turn on in _PDC

Comment 6 Venkatesh Pallipadi 2006-02-02 12:05:12 UTC

Created attachment 7219 [details]
patch 2/4 : P-state software coordination changes for acpi-cpufreq driver (rebased with 2.6.16-rc1-git6)

Updated patchset against 2.6.16-rc1-git6. Patch 1, 3 and 4 above applies
cleanly. But, patch 2had a conflict and Updating that one here.

Comment 7 Len Brown 2006-02-09 01:27:43 UTC

patches 1-4 applied to acpi-test tree

Comment 8 Venkatesh Pallipadi 2006-04-15 16:56:16 UTC

Created attachment 7878 [details]
Patch to treat hardware coordinated CPUs as independent in cpufreq

Addon patch that applies over all the original patches. This changes the
behavior with hardware coordination. Hardware coordination will be treated as
independent CPUs by cpufreq. That way we can do per cpu monitoring of P-states.

Comment 9 Len Brown 2006-06-25 21:32:04 UTC

patches 1-4 shipped in 2.6.17-git9 
patch in comment #8 added to acpi-test tree

Comment 10 Len Brown 2006-06-30 16:53:24 UTC

patch in comment #8 shipped after 2.6.17-git17 
in time for 2.6.18-rc1.  closed.