linux/drivers/acpi/processor_idle.c, branch v2.6.35

Merge branch 'misc' into release

2010-07-22T22:19:12Z

ACPI: create "processor.bm_check_disable" boot param

2010-07-22T21:23:10Z

processor.bm_check_disable=1" prevents Linux from checking BM_STS before entering C3-type cpu power states. This may be useful for a system running acpi_idle where the BIOS exports FADT C-states, _CST IO C-states, or _CST FFH C-states with the BM_STS bit set; while configuring the chipset to set BM_STS more frequently than perhaps is optimal. Note that such systems may have been developed using a tickful OS that would quickly clear BM_STS, rather than a tickless OS that may go for some time between checking and clearing BM_STS. Note also that an alternative for newer systems is to use the intel_idle driver, which always ignores BM_STS, relying Linux device drivers to register constraints explicitly via PM_QOS. https://bugzilla.kernel.org/show_bug.cgi?id=15886 Signed-off-by: Len Brown

ACPI: skip checking BM_STS if the BIOS doesn't ask for it

2010-07-22T20:54:27Z

It turns out that there is a bit in the _CST for Intel FFH C3 that tells the OS if we should be checking BM_STS or not. Linux has been unconditionally checking BM_STS. If the chip-set is configured to enable BM_STS, it can retard or completely prevent entry into deep C-states -- as illustrated by turbostat: http://userweb.kernel.org/~lenb/acpi/utils/pmtools/turbostat/ ref: Intel Processor Vendor-Specific ACPI Interface Specification table 4 "_CST FFH GAS Field Encoding" Bit 1: Set to 1 if OSPM should use Bus Master avoidance for this C-state https://bugzilla.kernel.org/show_bug.cgi?id=15886 Signed-off-by: Len Brown

ACPI: fix unused function warning

2010-07-21T15:30:09Z

CONFIG_ACPI_PROCFS=n: drivers/acpi/processor_idle.c:83: warning: 'us_to_pm_timer_ticks' defined but not used. Signed-off-by: KOSAKI Motohiro Signed-off-by: Andrew Morton Signed-off-by: Len Brown

ACPI: Eliminate us to pm ticks conversion in common path

2010-06-04T19:22:28Z

acpi_enter_[simple|bm] routines does us to pm tick conversion on every idle wakeup and the value is only used in /proc/acpi display. We can store the time in us and convert it into pm ticks before printing instead and avoid the conversion in the common path. Signed-off-by: Venkatesh Pallipadi Signed-off-by: Len Brown

ACPI: Fix the incorrect calculation about C-state idle time

2010-06-04T19:22:18Z

The C-state idle time is not calculated correctly, which will return the wrong residency time in C-state. It will have the following effects: 1. The system can't choose the deeper C-state when it is idle next time. Of course the system power is increased. E.g. On one server machine about 40W idle power is increased. 2. The powertop shows that it will stay in C0 running state about 95% time although the system is idle at most time. 2.6.35-rc1 regression caused-by: 2da513f582a96c053aacc2c92873978d2ea7abff (ACPI: Minor cleanup eliminating redundant PMTIMER_TICKS to NS conversion) Signed-off-by: Zhao Yakui Reported-by: Yu Zhidong Tested-by: Yu Zhidong Acked-by: Venkatesh Pallipadi Signed-off-by: Len Brown

Merge branch 'idle-release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-idle-2.6

2010-05-28T23:14:17Z

* 'idle-release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-idle-2.6: intel_idle: native hardware cpuidle driver for latest Intel processors ACPI: acpi_idle: touch TS_POLLING only in the non-MWAIT case acpi_pad: uses MONITOR/MWAIT, so it doesn't need to clear TS_POLLING sched: clarify commment for TS_POLLING ACPI: allow a native cpuidle driver to displace ACPI cpuidle: make cpuidle_curr_driver static cpuidle: add cpuidle_unregister_driver() error check cpuidle: fail to register if !CONFIG_CPU_IDLE

Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6

2010-05-28T21:42:18Z

* 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6: (27 commits) ACPI: Don't let acpi_pad needlessly mark TSC unstable drivers/acpi/sleep.h: Checkpatch cleanup ACPI: Minor cleanup eliminating redundant PMTIMER_TICKS to NS conversion ACPI: delete unused c-state promotion/demotion data strucutures ACPI: video: fix acpi_backlight=video ACPI: EC: Use kmemdup drivers/acpi: use kasprintf ACPI, APEI, EINJ injection parameters support Add x64 support to debugfs ACPI, APEI, Use ERST for persistent storage of MCE ACPI, APEI, Error Record Serialization Table (ERST) support ACPI, APEI, Generic Hardware Error Source memory error support ACPI, APEI, UEFI Common Platform Error Record (CPER) header Unified UUID/GUID definition ACPI Hardware Error Device (PNP0C33) support ACPI, APEI, PCIE AER, use general HEST table parsing in AER firmware_first setup ACPI, APEI, Document for APEI ACPI, APEI, EINJ support ACPI, APEI, HEST table parsing ACPI, APEI, APEI supporting infrastructure ...

ACPI: Minor cleanup eliminating redundant PMTIMER_TICKS to NS conversion

2010-05-28T19:00:55Z

acpi_enter_[simple,bm] does idle timing in ns, convert it to timeval, then to us, then to pmtimer_ticks and then back to ns. This patch changes things to idle timing in ns, convert it to us, and then to pmtimer_ticks. Just saves an imul along this path, but makes the code cleaner. Signed-off-by: Venkatesh Pallipadi Signed-off-by: Len Brown

ACPI: acpi_idle: touch TS_POLLING only in the non-MWAIT case

2010-05-28T17:58:57Z

commit d306ebc28649b89877a22158fe0076f06cc46f60 (ACPI: Be in TS_POLLING state during mwait based C-state entry) fixed an important power & performance issue where ACPI c2 and c3 C-states were clearing TS_POLLING even when using MWAIT (ACPI_STATE_FFH). That bug had been causing us to receive redundant scheduling interrups when we had already been woken up by MONITOR/MWAIT. Following up on that... In the MWAIT case, we don't have to subsequently check need_resched(), as that c heck was there for the TS_POLLING-clearing case. Note that not only does the cpuidle calling function already check need_resched() before calling us, the low-level entry into monitor/mwait calls it twice -- guaranteeing that a write to the trigger address can not go un-noticed. Also, in this case, we don't have to set TS_POLLING when we wake, because we never cleared it. Signed-off-by: Len Brown Acked-by: Venkatesh Pallipadi