14 Feb, 2008
2 commits
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Add a new sysfs entry under cpuidle states. desc - can be used by driver to
communicate to userspace any specific information about the state.
This helps in identifying the exact hardware C-states behind the ACPI C-state
definition.Idea is to export this through powertop, which will help to map the C-state
reported by powertop to actual hardware C-state.Signed-off-by: Venkatesh Pallipadi
Signed-off-by: Len Brown -
The raw_pci_read() interface (as the raw_pci_ops->read() before it)
unconditionally fills in a 32-bit integer return value regardless of the
size of the operation requested.So claiming to take a "void *" is wrong, as is passing in a pointer to
just a byte variable.Noticed by pageexec when enabling -fstack-protector (which needs other
patches too to actually work, but that's a separate issue).Acked-by: Len Brown
Signed-off-by: Linus Torvalds
07 Feb, 2008
14 commits
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Conflicts:
drivers/acpi/scan.c
include/linux/acpi.hSigned-off-by: Len Brown
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This patch contains the following possible cleanups:
- make the following needlessly global code static:
- drivers/acpi/bay.c:dev_attr_eject
- drivers/acpi/bay.c:dev_attr_present
- drivers/acpi/dock.c:dev_attr_docked
- drivers/acpi/dock.c:dev_attr_flags
- drivers/acpi/dock.c:dev_attr_uid
- drivers/acpi/dock.c:dev_attr_undock
- drivers/acpi/pci_bind.c:acpi_pci_unbind()
- drivers/acpi/pci_link.c:acpi_link_lock
- drivers/acpi/sbs.c:acpi_sbs_callback()
- drivers/acpi/sbshc.c:acpi_smbus_transaction()
- drivers/acpi/sleep/main.c:acpi_sleep_prepare()
- #if 0 the following unused global functions:
- drivers/acpi/numa.c:acpi_unmap_pxm_to_node()
- remove the following unused EXPORT_SYMBOL's:
- acpi_register_gsi
- acpi_unregister_gsi
- acpi_strict
- acpi_bus_receive_event
- register_acpi_bus_type
- unregister_acpi_bus_type
- acpi_os_printf
- acpi_os_sleep
- acpi_os_stall
- acpi_os_read_pci_configuration
- acpi_os_create_semaphore
- acpi_os_delete_semaphore
- acpi_os_wait_semaphore
- acpi_os_signal_semaphore
- acpi_os_signal
- acpi_pci_irq_enable
- acpi_get_pxmSigned-off-by: Adrian Bunk
Acked-by: Alexey Starikovskiy
Signed-off-by: Len Brown -
798d91039849486c7a4f1a458a5680cb55a65408
(ACPI: create CONFIG_ACPI_DEBUG_FUNC_TRACE)failed to associate the new tracing config option with the tracing code.
Signed-off-by: Len Brown
-
Conflicts:
include/acpi/acpi_bus.h
Signed-off-by: Len Brown
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Kernel mode graphics drivers need this ACPI notifier chaine
so that they can get notified upon hotkey events.Signed-off-by: Zhang Rui
Signed-off-by: Len Brown -
Conflicts:
drivers/acpi/video.c
Signed-off-by: Len Brown
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Add MWAIT idle for C1 state instead of halt, on platforms that support
C1 state with MWAIT.Renames cx->space_id to something more appropriate.
Signed-off-by: Venkatesh Pallipadi
Signed-off-by: Len Brown -
Small ACPICA extension to be able to store the name of operation regions in osl.c later
In ACPI, AML can define accesses to IO ports and System Memory by Operation
Regions. Those are not registered as done by PNPACPI using resource templates
(and _CRS/_SRS methods).The IO ports and System Memory regions may get accessed by arbitrary AML code.
When native drivers are accessing the same resources bad things can happen
(e.g. a critical shutdown temperature of 3000 C every 2 months or so).It is not really possible to register the operation regions via
request_resource, as they often overlap with pnp or other resources (e.g.
statically setup IO resources below 0x100).This approach stores all Operation Region declarations (IO and System Memory
only) at ACPI table parse time. It offers a similar functionality like
request_region and let drivers which are known to possibly use the same IO
ports and Memory which are also often used by ACPI (hwmon and i2c) check for
ACPI interference.A boot parameter acpi_enforce_resources=strict/lax/no is provided, which
is default set to lax:
- strict: let conflicting drivers fail to load with an error message
- lax: let conflicting driver work normal with a warning message
- no: no functional change at all
Depending on the feedback and the kind of interferences we see, this
should be set to strict at later time.Goal of this patch set is:
- Identify ACPI interferences in bug reports (very hard to reproduce
and to identify)
- Find BIOSes for that an ACPI driver should exist for specific HW
instead of a native one.
- stability in generalProvide acpi_check_{mem_}region.
Drivers can additionally check against possible ACPI interference by also
invoking this shortly before they call request_region.
If -EBUSY is returned, the driver must not load.
Use acpi_enforce_resources=strict/lax/no options to:
- strict: let conflicting drivers fail to load with an error message
- lax: let conflicting driver work normal with a warning message
- no: no functional change at allCc: "Mark M. Hoffman"
Cc: Jean Delvare
Cc: Len Brown
Cc: Bjorn Helgaas
Signed-off-by: Thomas Renninger
Signed-off-by: Andrew Morton
Signed-off-by: Len Brown -
See Documentation/ABI/testing/sysfs-firmware-acpi
Based-on-original-patch-by: Luming Yu
Acked-by: Greg Kroah-Hartman
Signed-off-by: Len Brown
03 Feb, 2008
1 commit
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Signed-off-by: Joe Perches
Signed-off-by: Adrian Bunk
02 Feb, 2008
4 commits
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Accordint to ACPI spec, the _TSD object provides T-state control cross
logical processor dependency information to OSPM.
After the _TSD data for all cpus are obtained, OSPM will set up
the T-state coordination between CPUs.Of course if the _TSD doesn't exist or _TSD data is incorrect , it is
assumed that there is no T-state coordination and T-state is changed
independently.Now there is no proper solution to update T-state coordination after
one cpu is hotplugged. So this patch won't support hotplugged cpu very well.Signed-off-by: Zhao Yakui
Signed-off-by: Len Brown -
Intel menlow driver needs to get the pointer of themal_zone_device
structure of an ACPI thermal zone.
Attach this to each ACPI thermal zone device object.Signed-off-by: Zhang Rui
Signed-off-by: Thomas Sujith
Signed-off-by: Len Brown -
Register ACPI processor as thermal cooling devices.
A combination of processor T-state and P-state are used for thermal throttling.
the processor will reduce the frequency first and then set the T-state.we use cpufreq_thermal_reduction_pctg to calculate the cpufreq limit,
and call cpufreq_verify_with_limit to set the cpufreq limit.
if cpufreq driver is loaded, then we have four cooling state for cpufreq control.
cooling state 0: cpufreq limit == max_freq
cooling state 1: cpufreq limit == max_freq * 80%
cooling state 2: cpufreq limit == max_freq * 60%
cooling state 3: cpufreq limit == max_freq * 40%after the cpufreq limit is set to 40 percentage of the max_freq,
we use T-state for cooling.eg. a processor has P-state support, and it has 8 T-state (T0-T7),
the max_state of the proceesor is 10:state cpufreq-limit T-state
0: max_freq T0
1: max_freq * 80% T0
2: max_freq * 60% T0
3: max_freq * 40% T0
4: max_freq * 40% T1
5: max_freq * 40% T2
6: max_freq * 40% T3
7: max_freq * 40% T4
8: max_freq * 40% T5
9: max_freq * 40% T6
10: max_freq * 40% T7Signed-off-by: Zhang Rui
Signed-off-by: Zhao Yakui
Signed-off-by: Thomas Sujith
Signed-off-by: Len Brown -
The execution of ACPI global control methods _GTS and _BFS is
currently tied to the preparation to enter a sleep state and to the
leaving of the sleep state, respectively. However, these functions
are called before disabling the nonboot CPUs and after enabling
them, respectively (in fact, on ACPI 1.0x systems the first of them
ought to be called before suspending devices), while according to the
ACPI specification, _GTS is to be executed right prior to entering
the system sleep state and _BFS is to be executed right after the
platfor firmware has returned control to the OS on wake up.Move the execution of _GTS and _BFS to the right places.
Signed-off-by: Rafael J. Wysocki
Acked-by: Pavel Machek
Signed-off-by: Len Brown
30 Jan, 2008
1 commit
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dummy placeholder for acpi/reboot.h
Signed-off-by: Ingo Molnar
Signed-off-by: Thomas Gleixner
25 Jan, 2008
1 commit
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We don't need a kset here, a simple kobject will do just fine, so
dynamically create the kobject and use it.Cc: Kay Sievers
Cc: Len Brown
Signed-off-by: Greg Kroah-Hartman
24 Jan, 2008
1 commit
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This reverts commit 93ad7c07ad487b036add8760dabcc35666a550ef.
http://bugzilla.kernel.org/show_bug.cgi?id=9798
Signed-off-by: Len Brown
08 Dec, 2007
1 commit
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References: https://bugzilla.novell.com/show_bug.cgi?id=302482
Signed-off-by: Thomas Renninger
Signed-off-by: Kay Sievers
Signed-off-by: Frank Seidel
Signed-off-by: Len Brown
20 Nov, 2007
2 commits
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Fix for http://bugzilla.kernel.org/show_bug.cgi?id=9355
cpuidle always used to fallback to C2 if there is some bm activity while
entering C3. But, presence of C2 is not always guaranteed. Change cpuidle
algorithm to detect a safe_state to fallback in case of bm_activity and
use that state instead of C2.Signed-off-by: Venkatesh Pallipadi
Signed-off-by: Len Brown
26 Oct, 2007
1 commit
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force_power_state was used as a workaround for invalid cached
power state of the device. We do not cache power state, so no need for
workaround.Signed-off-by: Alexey Starikovskiy
Acked-by: Rafael J. Wysocki
Signed-off-by: Len Brown
22 Oct, 2007
1 commit
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This patch supports the upcomming Intel IOMMU hardware a.k.a. Intel(R)
Virtualization Technology for Directed I/O Architecture and the hardware spec
for the same can be found here
http://www.intel.com/technology/virtualization/index.htmFAQ! (questions from akpm, answers from ak)
> So... what's all this code for?
>
> I assume that the intent here is to speed things up under Xen, etc?Yes in some cases, but not this code. That would be the Xen version of this
code that could potentially assign whole devices to guests. I expect this to
be only useful in some special cases though because most hardware is not
virtualizable and you typically want an own instance for each guest.Ok at some point KVM might implement this too; i likely would use this code
for this.> Do we
> have any benchmark results to help us to decide whether a merge would be
> justified?The main advantage for doing it in the normal kernel is not performance, but
more safety. Broken devices won't be able to corrupt memory by doing random
DMA.Unfortunately that doesn't work for graphics yet, for that need user space
interfaces for the X server are needed.There are some potential performance benefits too:
- When you have a device that cannot address the complete address range an
IOMMU can remap its memory instead of bounce buffering. Remapping is likely
cheaper than copying.- The IOMMU can merge sg lists into a single virtual block. This could
potentially speed up SG IO when the device is slow walking SG lists. [I
long ago benchmarked 5% on some block benchmark with an old MPT Fusion; but
it probably depends a lot on the HBA]And you get better driver debugging because unexpected memory accesses from
the devices will cause a trappable event.>
> Does it slow anything down?It adds more overhead to each IO so yes.
This patch:
Add support for early detection and parsing of DMAR's (DMA Remapping) reported
to OS via ACPI tables.DMA remapping(DMAR) devices support enables independent address translations
for Direct Memory Access(DMA) from Devices. These DMA remapping devices are
reported via ACPI tables and includes pci device scope covered by these DMA
remapping device.For detailed info on the specification of "Intel(R) Virtualization Technology
for Directed I/O Architecture" please see
http://www.intel.com/technology/virtualization/index.htmSigned-off-by: Anil S Keshavamurthy
Cc: Andi Kleen
Cc: Peter Zijlstra
Cc: Muli Ben-Yehuda
Cc: "Siddha, Suresh B"
Cc: Arjan van de Ven
Cc: Ashok Raj
Cc: "David S. Miller"
Cc: Christoph Lameter
Cc: Greg KH
Cc: Len Brown
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
10 Oct, 2007
6 commits
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ACPI uses acpi_get_register() in order to get into suspend.
This function is guarded by acpi_gbl_hardware_lock, which will be carried
into resume phase.
At resume interrupts are enabled and first ACPI interrupt deadlocks on this
lock.
Solution seems to be to not lock register read, as there are no concurrent
activity at this point.Reference: http://bugzilla.kernel.org/show_bug.cgi?id=7499
Signed-off-by: Alexey Starikovskiy
Signed-off-by: Len Brown -
use_lock flag is used once for acpi_hw_register_read, and never for
acpi_hw_register_write. It will greatly simplify understanding of
locking if we just drop this use_lock altogether, and wrap the only call
to ..._read in lock/unlock.Signed-off-by: Alexey Starikovskiy
Signed-off-by: Len Brown -
commit e5a16b1f9eec0af7cfa0830304b41c1c0833cf9f
Author: Len Brown
Date: Tue Oct 2 23:44:44 2007 -0400cpuidle: shrink diff
processor_idle.c | 440 +++++++++++++++++++++++++++++++++++++++++--
1 file changed, 429 insertions(+), 11 deletions(-)Signed-off-by: Len Brown
commit dfbb9d5aedfb18848a3e0d6f6e3e4969febb209c
Author: Len Brown
Date: Wed Sep 26 02:17:55 2007 -0400cpuidle: reduce diff size
Reduces the cpuidle processor_idle.c diff vs 2.6.22 from this
processor_idle.c | 2006 ++++++++++++++++++++++++++-----------------
1 file changed, 1219 insertions(+), 787 deletions(-)to this:
processor_idle.c | 502 +++++++++++++++++++++++++++++++++++++++----
1 file changed, 458 insertions(+), 44 deletions(-)...for the purpose of making the cpuilde patch less invasive
and easier to review.no functional changes. build tested only.
Signed-off-by: Len Brown
commit 889172fc915f5a7fe20f35b133cbd205ce69bf6c
Author: Venki Pallipadi
Date: Thu Sep 13 13:40:05 2007 -0700cpuidle: Retain old ACPI policy for !CONFIG_CPU_IDLE
Retain the old policy in processor_idle, so that when CPU_IDLE is not
configured, old C-state policy will still be used. This provides a
clean gradual migration path from old ACPI policy to new cpuidle
based policy.Signed-off-by: Venkatesh Pallipadi
Signed-off-by: Len Browncommit 9544a8181edc7ecc33b3bfd69271571f98ed08bc
Author: Venki Pallipadi
Date: Thu Sep 13 13:39:17 2007 -0700cpuidle: Configure governors by default
Quoting Len "Do not give an option to users to shoot themselves in the foot".
Remove the configurability of ladder and menu governors as they are
needed for default policy of cpuidle. That way users will not be able to
have cpuidle without any policy loosing all C-state power savings.Signed-off-by: Venkatesh Pallipadi
Signed-off-by: Len Browncommit 8975059a2c1e56cfe83d1bcf031bcf4cb39be743
Author: Adam Belay
Date: Tue Aug 21 18:27:07 2007 -0400CPUIDLE: load ACPI properly when CPUIDLE is disabled
Change the registration return codes for when CPUIDLE
support is not compiled into the kernel. As a result, the ACPI
processor driver will load properly even if CPUIDLE is unavailable.
However, it may be possible to cleanup the ACPI processor driver further
and eliminate some dead code paths.Signed-off-by: Adam Belay
Acked-by: Venkatesh Pallipadi
Signed-off-by: Len Browncommit e0322e2b58dd1b12ec669bf84693efe0dc2414a8
Author: Adam Belay
Date: Tue Aug 21 18:26:06 2007 -0400CPUIDLE: remove cpuidle_get_bm_activity()
Remove cpuidle_get_bm_activity() and updates governors
accordingly.Signed-off-by: Adam Belay
Acked-by: Venkatesh Pallipadi
Signed-off-by: Len Browncommit 18a6e770d5c82ba26653e53d240caa617e09e9ab
Author: Adam Belay
Date: Tue Aug 21 18:25:58 2007 -0400CPUIDLE: max_cstate fix
Currently max_cstate is limited to 0, resulting in no idle processor
power management on ACPI platforms. This patch restores the value to
the array size.Signed-off-by: Adam Belay
Acked-by: Venkatesh Pallipadi
Signed-off-by: Len Browncommit 1fdc0887286179b40ce24bcdbde663172e205ef0
Author: Adam Belay
Date: Tue Aug 21 18:25:40 2007 -0400CPUIDLE: handle BM detection inside the ACPI Processor driver
Update the ACPI processor driver to detect BM activity and
limit state entry depth internally, rather than exposing such
requirements to CPUIDLE. As a result, CPUIDLE can drop this
ACPI-specific interface and become more platform independent. BM
activity is now handled much more aggressively than it was in the
original implementation, so some testing coverage may be needed to
verify that this doesn't introduce any DMA buffer under-run issues.Signed-off-by: Adam Belay
Acked-by: Venkatesh Pallipadi
Signed-off-by: Len Browncommit 0ef38840db666f48e3cdd2b769da676c57228dd9
Author: Adam Belay
Date: Tue Aug 21 18:25:14 2007 -0400CPUIDLE: menu governor updates
Tweak the menu governor to more effectively handle non-timer
break events. Non-timer break events are detected by comparing the
actual sleep time to the expected sleep time. In future revisions, it
may be more reliable to use the timer data structures directly.Signed-off-by: Adam Belay
Acked-by: Venkatesh Pallipadi
Signed-off-by: Len Browncommit bb4d74fca63fa96cf3ace644b15ae0f12b7df5a1
Author: Adam Belay
Date: Tue Aug 21 18:24:40 2007 -0400CPUIDLE: fix 'current_governor' sysfs entry
Allow the "current_governor" sysfs entry to properly handle
input terminated with '\n'.Signed-off-by: Adam Belay
Acked-by: Venkatesh Pallipadi
Signed-off-by: Len Browncommit df3c71559bb69b125f1a48971bf0d17f78bbdf47
Author: Len Brown
Date: Sun Aug 12 02:00:45 2007 -0400cpuidle: fix IA64 build (again)
Signed-off-by: Len Brown
commit a02064579e3f9530fd31baae16b1fc46b5a7bca8
Author: Venkatesh Pallipadi
Date: Sun Aug 12 01:39:27 2007 -0400cpuidle: Remove support for runtime changing of max_cstate
Remove support for runtime changeability of max_cstate. Drivers can use
use latency APIs.max_cstate can still be used as a boot time option and dmi override.
Signed-off-by: Venkatesh Pallipadi
Signed-off-by: Len Browncommit 0912a44b13adf22f5e3f607d263aed23b4910d7e
Author: Venkatesh Pallipadi
Date: Sun Aug 12 01:39:16 2007 -0400cpuidle: Remove ACPI cstate_limit calls from ipw2100
ipw2100 already has code to use accetable_latency interfaces to limit the
C-state. Remove the calls to acpi_set_cstate_limit and acpi_get_cstate_limit
as they are redundant.Signed-off-by: Venkatesh Pallipadi
Signed-off-by: Len Browncommit c649a76e76be6bff1fd770d0a775798813a3f6e0
Author: Venkatesh Pallipadi
Date: Sun Aug 12 01:35:39 2007 -0400cpuidle: compile fix for pause and resume functions
Fix the compilation failure when cpuidle is not compiled in.
Signed-off-by: Venkatesh Pallipadi
Acked-by: Adam Belay
Signed-off-by: Len Browncommit 2305a5920fb8ee6ccec1c62ade05aa8351091d71
Author: Adam Belay
Date: Thu Jul 19 00:49:00 2007 -0400cpuidle: re-write
Some portions have been rewritten to make the code cleaner and lighter
weight. The following is a list of changes:1.) the state name is now included in the sysfs interface
2.) detection, hotplug, and available state modifications are handled by
CPUIDLE drivers directly
3.) the CPUIDLE idle handler is only ever installed when at least one
cpuidle_device is enabled and ready
4.) the menu governor BM code no longer overflows
5.) the sysfs attributes are now printed as unsigned integers, avoiding
negative values
6.) a variety of other small cleanupsAlso, Idle drivers are no longer swappable during runtime through the
CPUIDLE sysfs inteface. On i386 and x86_64 most idle handlers (e.g.
poll, mwait, halt, etc.) don't benefit from an infrastructure that
supports multiple states, so I think using a more general case idle
handler selection mechanism would be cleaner.Signed-off-by: Adam Belay
Acked-by: Venkatesh Pallipadi
Acked-by: Shaohua Li
Signed-off-by: Len Browncommit df25b6b56955714e6e24b574d88d1fd11f0c3ee5
Author: Len Brown
Date: Tue Jul 24 17:08:21 2007 -0400cpuidle: fix IA64 buid
Signed-off-by: Len Brown
commit fd6ada4c14488755ff7068860078c437431fbccd
Author: Adrian Bunk
Date: Mon Jul 9 11:33:13 2007 -0700cpuidle: static
make cpuidle_replace_governor() static
Signed-off-by: Adrian Bunk
Cc: Venkatesh Pallipadi
Signed-off-by: Andrew Morton
Signed-off-by: Len Browncommit c1d4a2cebcadf2429c0c72e1d29aa2a9684c32e0
Author: Adrian Bunk
Date: Tue Jul 3 00:54:40 2007 -0400cpuidle: static
This patch makes the needlessly global struct menu_governor static.
Signed-off-by: Adrian Bunk
Signed-off-by: Andrew Morton
Signed-off-by: Len Browncommit dbf8780c6e8d572c2c273da97ed1cca7608fd999
Author: Andrew Morton
Date: Tue Jul 3 00:49:14 2007 -0400export symbol tick_nohz_get_sleep_length
ERROR: "tick_nohz_get_sleep_length" [drivers/cpuidle/governors/menu.ko] undefined!
ERROR: "tick_nohz_get_idle_jiffies" [drivers/cpuidle/governors/menu.ko] undefined!And please be sure to get your changes to core kernel suitably reviewed.
Cc: Adam Belay
Cc: Venki Pallipadi
Cc: Ingo Molnar
Cc: Thomas Gleixner
Cc: john stultz
Signed-off-by: Andrew Morton
Signed-off-by: Len Browncommit 29f0e248e7017be15f99febf9143a2cef00b2961
Author: Andrew Morton
Date: Tue Jul 3 00:43:04 2007 -0400tick.h needs hrtimer.h
It uses hrtimers.
Signed-off-by: Andrew Morton
Signed-off-by: Len Browncommit e40cede7d63a029e92712a3fe02faee60cc38fb4
Author: Venki Pallipadi
Date: Tue Jul 3 00:40:34 2007 -0400cpuidle: first round of documentation updates
Documentation changes based on Pavel's feedback.
Signed-off-by: Venkatesh Pallipadi
Signed-off-by: Andrew Morton
Signed-off-by: Len Browncommit 83b42be2efece386976507555c29e7773a0dfcd1
Author: Venki Pallipadi
Date: Tue Jul 3 00:39:25 2007 -0400cpuidle: add rating to the governors and pick the one with highest rating by default
Introduce a governor rating scheme to pick the right governor by default.
Signed-off-by: Venkatesh Pallipadi
Signed-off-by: Andrew Morton
Signed-off-by: Len Browncommit d2a74b8c5e8f22def4709330d4bfc4a29209b71c
Author: Venki Pallipadi
Date: Tue Jul 3 00:38:08 2007 -0400cpuidle: make cpuidle sysfs driver governor switch off by default
Make default cpuidle sysfs to show current_governor and current_driver in
read-only mode. More elaborate available_governors and available_drivers with
writeable current_governor and current_driver interface only appear with
"cpuidle_sysfs_switch" boot parameter.Signed-off-by: Venkatesh Pallipadi
Signed-off-by: Andrew Morton
Signed-off-by: Len Browncommit 1f60a0e80bf83cf6b55c8845bbe5596ed8f6307b
Author: Venki Pallipadi
Date: Tue Jul 3 00:37:00 2007 -0400cpuidle: menu governor: change the early break condition
Change the C-state early break out algorithm in menu governor.
We only look at early breakouts that result in wakeups shorter than idle
state's target_residency. If such a breakout is frequent enough, eliminate
the particular idle state upto a timeout period.Signed-off-by: Venkatesh Pallipadi
Signed-off-by: Andrew Morton
Signed-off-by: Len Browncommit 45a42095cf64b003b4a69be3ce7f434f97d7af51
Author: Venki Pallipadi
Date: Tue Jul 3 00:35:38 2007 -0400cpuidle: fix uninitialized variable in sysfs routine
Fix the uninitialized usage of ret.
Signed-off-by: Venkatesh Pallipadi
Signed-off-by: Andrew Morton
Signed-off-by: Len Browncommit 80dca7cdba3e6ee13eae277660873ab9584eb3be
Author: Venki Pallipadi
Date: Tue Jul 3 00:34:16 2007 -0400cpuidle: reenable /proc/acpi//power interface for the time being
Keep /proc/acpi/processor/CPU*/power around for a while as powertop depends
on it. It will be marked deprecated and removed in future. powertop can use
cpuidle interfaces instead.Signed-off-by: Venkatesh Pallipadi
Signed-off-by: Andrew Morton
Signed-off-by: Len Browncommit 589c37c2646c5e3813a51255a5ee1159cb4c33fc
Author: Venki Pallipadi
Date: Tue Jul 3 00:32:37 2007 -0400cpuidle: menu governor and hrtimer compile fix
Compile fix for menu governor.
Signed-off-by: Venkatesh Pallipadi
Signed-off-by: Andrew Morton
Signed-off-by: Len Browncommit 0ba80bd9ab3ed304cb4f19b722e4cc6740588b5e
Author: Len Brown
Date: Thu May 31 22:51:43 2007 -0400cpuidle: build fix - cpuidle vs ipw2100 module
ERROR: "acpi_set_cstate_limit" [drivers/net/wireless/ipw2100.ko] undefined!
Signed-off-by: Len Brown
commit d7d8fa7f96a7f7682be7c6cc0cc53fa7a18c3b58
Author: Adam Belay
Date: Sat Mar 24 03:47:07 2007 -0400cpuidle: add the 'menu' governor
Here is my first take at implementing an idle PM governor that takes
full advantage of NO_HZ. I call it the 'menu' governor because it
considers the full list of idle states before each entry.I've kept the implementation fairly simple. It attempts to guess the
next residency time and then chooses a state that would meet at least
the break-even point between power savings and entry cost. To this end,
it selects the deepest idle state that satisfies the following
constraints:
1. If the idle time elapsed since bus master activity was detected
is below a threshold (currently 20 ms), then limit the selection
to C2-type or above.
2. Do not choose a state with a break-even residency that exceeds
the expected time remaining until the next timer interrupt.
3. Do not choose a state with a break-even residency that exceeds
the elapsed time between the last pair of break events,
excluding timer interrupts.This governor has an advantage over "ladder" governor because it
proactively checks how much time remains until the next timer interrupt
using the tick infrastructure. Also, it handles device interrupt
activity more intelligently by not including timer interrupts in break
event calculations. Finally, it doesn't make policy decisions using the
number of state entries, which can have variable residency times (NO_HZ
makes these potentially very large), and instead only considers sleep
time deltas.The menu governor can be selected during runtime using the cpuidle sysfs
interface like so:
"echo "menu" > /sys/devices/system/cpu/cpuidle/current_governor"Signed-off-by: Adam Belay
Signed-off-by: Len Browncommit a4bec7e65aa3b7488b879d971651cc99a6c410fe
Author: Adam Belay
Date: Sat Mar 24 03:47:03 2007 -0400cpuidle: export time until next timer interrupt using NO_HZ
Expose information about the time remaining until the next
timer interrupt expires by utilizing the dynticks infrastructure.
Also modify the main idle loop to allow dynticks to handle
non-interrupt break events (e.g. DMA). Finally, expose sleep ticks
information to external code. Thomas Gleixner is responsible for much
of the code in this patch. However, I've made some additional changes,
so I'm probably responsible if there are any bugs or oversights :)Signed-off-by: Adam Belay
Signed-off-by: Len Browncommit 2929d8996fbc77f41a5ff86bb67cdde3ca7d2d72
Author: Adam Belay
Date: Sat Mar 24 03:46:58 2007 -0400cpuidle: governor API changes
This patch prepares cpuidle for the menu governor. It adds an optional
stage after idle state entry to give the governor an opportunity to
check why the state was exited. Also it makes sure the idle loop
returns after each state entry, allowing the appropriate dynticks code
to run.Signed-off-by: Adam Belay
Signed-off-by: Len Browncommit 3a7fd42f9825c3b03e364ca59baa751bb350775f
Author: Venki Pallipadi
Date: Thu Apr 26 00:03:59 2007 -0700cpuidle: hang fix
Prevent hang on x86-64, when ACPI processor driver is added as a module on
a system that does not support C-states.x86-64 expects all idle handlers to enable interrupts before returning from
idle handler. This is due to enter_idle(), exit_idle() races. Make
cpuidle_idle_call() confirm to this when there is no pm_idle_old.Also, cpuidle look at the return values of attch_driver() and set
current_driver to NULL if attach fails on all CPUs.Signed-off-by: Venkatesh Pallipadi
Signed-off-by: Andrew Morton
Signed-off-by: Len Browncommit 4893339a142afbd5b7c01ffadfd53d14746e858e
Author: Shaohua Li
Date: Thu Apr 26 10:40:09 2007 +0800cpuidle: add support for max_cstate limit
With CPUIDLE framework, the max_cstate (to limit max cpu c-state)
parameter is ingored. Some systems require it to ignore C2/C3
and some drivers like ipw require it too.Signed-off-by: Shaohua Li
Signed-off-by: Len Browncommit 43bbbbe1cb998cbd2df656f55bb3bfe30f30e7d1
Author: Shaohua Li
Date: Thu Apr 26 10:40:13 2007 +0800cpuidle: add cpuidle_fore_redetect_devices API
add cpuidle_force_redetect_devices API,
which forces all CPU redetect idle states.
Next patch will use it.Signed-off-by: Shaohua Li
Signed-off-by: Len Browncommit d1edadd608f24836def5ec483d2edccfb37b1d19
Author: Shaohua Li
Date: Thu Apr 26 10:40:01 2007 +0800cpuidle: fix sysfs related issue
Fix the cpuidle sysfs issue.
a. make kobject dynamicaly allocated
b. fixed sysfs init issue to avoid suspend/resume issueSigned-off-by: Shaohua Li
Signed-off-by: Len Browncommit 7169a5cc0d67b263978859672e86c13c23a5570d
Author: Randy Dunlap
Date: Wed Mar 28 22:52:53 2007 -0400cpuidle: 1-bit field must be unsigned
A 1-bit bitfield has no room for a sign bit.
drivers/cpuidle/governors/ladder.c:54:16: error: dubious bitfield without explicit `signed' or `unsigned'Signed-off-by: Randy Dunlap
Cc: Venkatesh Pallipadi
Signed-off-by: Andrew Morton
Signed-off-by: Len Browncommit 4658620158dc2fbd9e4bcb213c5b6fb5d05ba7d4
Author: Venkatesh Pallipadi
Date: Wed Mar 28 22:52:41 2007 -0400cpuidle: fix boot hang
Patch for cpuidle boot hang reported by Larry Finger here.
http://www.ussg.iu.edu/hypermail/linux/kernel/0703.2/2025.htmlSigned-off-by: Venkatesh Pallipadi
Cc: Larry Finger
Signed-off-by: Andrew Morton
Signed-off-by: Len Browncommit c17e168aa6e5fe3851baaae8df2fbc1cf11443a9
Author: Len Brown
Date: Wed Mar 7 04:37:53 2007 -0500cpuidle: ladder does not depend on ACPI
build fix for CONFIG_ACPI=n
In file included from drivers/cpuidle/governors/ladder.c:21:
include/acpi/processor.h:88: error: expected specifier-qualifier-list before âacpi_integerâ
include/acpi/processor.h:106: error: expected specifier-qualifier-list before âacpi_integerâ
include/acpi/processor.h:168: error: expected specifier-qualifier-list before âacpi_handleâSigned-off-by: Len Brown
commit 8c91d958246bde68db0c3f0c57b535962ce861cb
Author: Adrian Bunk
Date: Tue Mar 6 02:29:40 2007 -0800cpuidle: make code static
This patch makes the following needlessly global code static:
- driver.c: __cpuidle_find_driver()
- governor.c: __cpuidle_find_governor()
- ladder.c: struct ladder_governorSigned-off-by: Adrian Bunk
Cc: Venkatesh Pallipadi
Cc: Adam Belay
Cc: Shaohua Li
Signed-off-by: Andrew Morton
Signed-off-by: Len Browncommit 0c39dc3187094c72c33ab65a64d2017b21f372d2
Author: Venkatesh Pallipadi
Date: Wed Mar 7 02:38:22 2007 -0500cpu_idle: fix build break
This patch fixes a build breakage with !CONFIG_HOTPLUG_CPU and
CONFIG_CPU_IDLE.Signed-off-by: Venkatesh Pallipadi
Signed-off-by: Adrian Bunk
Signed-off-by: Andrew Morton
Signed-off-by: Len Browncommit 8112e3b115659b07df340ef170515799c0105f82
Author: Venkatesh Pallipadi
Date: Tue Mar 6 02:29:39 2007 -0800cpuidle: build fix for !CPU_IDLE
Fix the compile issues when CPU_IDLE is not configured.
Signed-off-by: Venkatesh Pallipadi
Cc: Adam Belay
Cc: Shaohua Li
Signed-off-by: Andrew Morton
Signed-off-by: Len Browncommit 1eb4431e9599cd25e0d9872f3c2c8986821839dd
Author: Venkatesh Pallipadi
Date: Thu Feb 22 13:54:57 2007 -0800cpuidle take2: Basic documentation for cpuidle
Documentation for cpuidle infrastructure
Signed-off-by: Venkatesh Pallipadi
Signed-off-by: Adam Belay
Signed-off-by: Shaohua Li
Signed-off-by: Len Browncommit ef5f15a8b79123a047285ec2e3899108661df779
Author: Venkatesh Pallipadi
Date: Thu Feb 22 13:54:03 2007 -0800cpuidle take2: Hookup ACPI C-states driver with cpuidle
Hookup ACPI C-states onto generic cpuidle infrastructure.
drivers/acpi/procesor_idle.c is now a ACPI C-states driver that registers as
a driver in cpuidle infrastructure and the policy part is removed from
drivers/acpi/processor_idle.c. We use governor in cpuidle instead.Signed-off-by: Shaohua Li
Signed-off-by: Venkatesh Pallipadi
Signed-off-by: Adam Belay
Signed-off-by: Len Browncommit 987196fa82d4db52c407e8c9d5dec884ba602183
Author: Venkatesh Pallipadi
Date: Thu Feb 22 13:52:57 2007 -0800cpuidle take2: Core cpuidle infrastructure
Announcing 'cpuidle', a new CPU power management infrastructure to manage
idle CPUs in a clean and efficient manner.
cpuidle separates out the drivers that can provide support for multiple types
of idle states and policy governors that decide on what idle state to use
at run time.
A cpuidle driver can support multiple idle states based on parameters like
varying power consumption, wakeup latency, etc (ACPI C-states for example).
A cpuidle governor can be usage model specific (laptop, server,
laptop on battery etc).
Main advantage of the infrastructure being, it allows independent development
of drivers and governors and allows for better CPU power management.A huge thanks to Adam Belay and Shaohua Li who were part of this mini-project
since its beginning and are greatly responsible for this patchset.This patch:
Core cpuidle infrastructure.
Introduces a new abstraction layer for cpuidle:
* which manages drivers that can support multiple idles states. Drivers
can be generic or particular to specific hardware/platform
* allows pluging in multiple policy governors that can take idle state policy
decision
* The core also has a set of sysfs interfaces with which administrato can know
about supported drivers and governors and switch them at run time.Signed-off-by: Adam Belay
Signed-off-by: Shaohua Li
Signed-off-by: Venkatesh Pallipadi
Signed-off-by: Len BrownSigned-off-by: Len Brown
28 Sep, 2007
2 commits
-
acpi_bus_generate_event() takes two strings out of passed device object.
SBS needs to supply these strings directly.Signed-off-by: Alexey Starikovskiy
Signed-off-by: Len Brown -
S4 suspend to disk will disable GPE's permanently
because acpi_gpe_sleep_prepare() does not have
a counterpart at resume time. Thus, those devices
became unavailable for wakeup from subsequent
S3 suspend-to-ram.Here acpi_gpe_sleep_prepare() is removed, and upon suspend
acpi_enable_wakeup_device() gets its functionality.
Upon resume, acpi_disable_wakeup_device() restores the state.https://bugzilla.novell.com/show_bug.cgi?id=292300
Signed-off-by: Alexey Starikovskiy
Acked-by: Pavel Machek
Signed-off-by: Len Brown
26 Sep, 2007
1 commit
-
Signed-off-by: Alexey Starikovskiy
Acked-by: Rafael J. Wysocki
Signed-off-by: Len Brown
23 Sep, 2007
1 commit
-
device_suspend() calls ACPI suspend functions, which seems to have undesired
side effects on lower idle C-states. It took me some time to realize that
especially the VAIO BIOSes (both Andrews jinxed UP and my elfstruck SMP one)
show this effect. I'm quite sure that other bug reports against suspend/resume
about turning the system into a brick have the same root cause.After fishing in the dark for quite some time, I realized that removing the ACPI
processor module before suspend (this removes the lower C-state functionality)
made the problem disappear. Interestingly enough the propability of having a
bricked box is influenced by various factors (interrupts, size of the ram image,
...). Even adding a bunch of printks in the wrong places made the problem go
away. The previous periodic tick implementation simply pampered over the
problem, which explains why the dyntick / clockevents changes made this more
prominent.We avoid complex functionality during the boot process and we have to do the
same during suspend/resume. It is a similar scenario and equaly fragile.Add suspend / resume functions to the ACPI processor code and disable the lower
idle C-states across suspend/resume. Fall back to the default idle
implementation (halt) instead.Signed-off-by: Thomas Gleixner
Tested-by: Andrew Morton
Cc: Len Brown
Cc: Venkatesh Pallipadi
Cc: Rafael J. Wysocki
Signed-off-by: Linus Torvalds
25 Aug, 2007
1 commit
-
Conflicts:
drivers/acpi/video.c
Signed-off-by: Len Brown