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KVM environments do not support APERF/MPERF MSRs. intel_pstate cannot
operate without these registers.
The previous validity checks in intel_pstate_msrs_not_valid() are
insufficent in nested KVMs.
References: https://bugzilla.redhat.com/show_bug.cgi?id=1046317
Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
Cc: All applicable <stable@vger.kernel.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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If pstate.current_pstate is 0 after the initial
intel_pstate_get_cpu_pstates(), this means that we were unable to
obtain any useful P-state information and there is no reason to
continue, so free memory and return an error in that case.
This fixes the following divide error occuring in a nested KVM
guest:
Intel P-state driver initializing.
Intel pstate controlling: cpu 0
cpufreq: __cpufreq_add_dev: ->get() failed
divide error: 0000 [#1] SMP
Modules linked in:
CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.13.0-0.rc4.git5.1.fc21.x86_64 #1
Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
task: ffff88001ea20000 ti: ffff88001e9bc000 task.ti: ffff88001e9bc000
RIP: 0010:[<ffffffff815c551d>] [<ffffffff815c551d>] intel_pstate_timer_func+0x11d/0x2b0
RSP: 0000:ffff88001ee03e18 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff88001a454348 RCX: 0000000000006100
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff88001ee03e38 R08: 0000000000000000 R09: 0000000000000000
R10: ffff88001ea20000 R11: 0000000000000000 R12: 00000c0a1ea20000
R13: 1ea200001ea20000 R14: ffffffff815c5400 R15: ffff88001a454348
FS: 0000000000000000(0000) GS:ffff88001ee00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 0000000000000000 CR3: 0000000001c0c000 CR4: 00000000000006f0
Stack:
fffffffb1a454390 ffffffff821a4500 ffff88001a454390 0000000000000100
ffff88001ee03ea8 ffffffff81083e9a ffffffff81083e15 ffffffff82d5ed40
ffffffff8258cc60 0000000000000000 ffffffff81ac39de 0000000000000000
Call Trace:
<IRQ>
[<ffffffff81083e9a>] call_timer_fn+0x8a/0x310
[<ffffffff81083e15>] ? call_timer_fn+0x5/0x310
[<ffffffff815c5400>] ? pid_param_set+0x130/0x130
[<ffffffff81084354>] run_timer_softirq+0x234/0x380
[<ffffffff8107aee4>] __do_softirq+0x104/0x430
[<ffffffff8107b5fd>] irq_exit+0xcd/0xe0
[<ffffffff81770645>] smp_apic_timer_interrupt+0x45/0x60
[<ffffffff8176efb2>] apic_timer_interrupt+0x72/0x80
<EOI>
[<ffffffff810e15cd>] ? vprintk_emit+0x1dd/0x5e0
[<ffffffff81757719>] printk+0x67/0x69
[<ffffffff815c1493>] __cpufreq_add_dev.isra.13+0x883/0x8d0
[<ffffffff815c14f0>] cpufreq_add_dev+0x10/0x20
[<ffffffff814a14d1>] subsys_interface_register+0xb1/0xf0
[<ffffffff815bf5cf>] cpufreq_register_driver+0x9f/0x210
[<ffffffff81fb19af>] intel_pstate_init+0x27d/0x3be
[<ffffffff81761e3e>] ? mutex_unlock+0xe/0x10
[<ffffffff81fb1732>] ? cpufreq_gov_dbs_init+0x12/0x12
[<ffffffff8100214a>] do_one_initcall+0xfa/0x1b0
[<ffffffff8109dbf5>] ? parse_args+0x225/0x3f0
[<ffffffff81f64193>] kernel_init_freeable+0x1fc/0x287
[<ffffffff81f638d0>] ? do_early_param+0x88/0x88
[<ffffffff8174b530>] ? rest_init+0x150/0x150
[<ffffffff8174b53e>] kernel_init+0xe/0x130
[<ffffffff8176e27c>] ret_from_fork+0x7c/0xb0
[<ffffffff8174b530>] ? rest_init+0x150/0x150
Code: c1 e0 05 48 63 bc 03 10 01 00 00 48 63 83 d0 00 00 00 48 63 d6 48 c1 e2 08 c1 e1 08 4c 63 c2 48 c1 e0 08 48 98 48 c1 e0 08 48 99 <49> f7 f8 48 98 48 0f af f8 48 c1 ff 08 29 f9 89 ca c1 fa 1f 89
RIP [<ffffffff815c551d>] intel_pstate_timer_func+0x11d/0x2b0
RSP <ffff88001ee03e18>
---[ end trace f166110ed22cc37a ]---
Kernel panic - not syncing: Fatal exception in interrupt
Reported-and-tested-by: Kashyap Chamarthy <kchamart@redhat.com>
Cc: Josh Boyer <jwboyer@fedoraproject.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: All applicable <stable@vger.kernel.org>
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Prevent __cpufreq_add_dev() from overwriting the existing values of
user_policy.{min|max|policy|governor} with defaults during resume
from system suspend.
Fixes: 5302c3fb2e62 ("cpufreq: Perform light-weight init/teardown during suspend/resume")
Reported-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Cc: 3.12+ <stable@vger.kernel.org> # 3.12+
[rjw: Changelog]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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If cpufreq_policy_restore() returns NULL during system resume,
__cpufreq_add_dev() should just fall back to the full initialization
instead of returning an error, because that may actually make things
work. Moreover, it should not leave stale fallback data behind after
it has failed to restore a previously existing policy.
This change is based on Viresh Kumar's work.
Fixes: 5302c3fb2e62 ("cpufreq: Perform light-weight init/teardown during suspend/resume")
Reported-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Cc: 3.12+ <stable@vger.kernel.org> # 3.12+
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drivers
When configuring a default governor (via CONFIG_CPU_FREQ_DEFAULT_*) with the
intel_pstate driver, the desired default policy is not properly set. For
example, setting 'CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE' ends up with the
'powersave' policy being set.
Fix by configuring the correct default policy, if either 'powersave' or
'performance' are requested. Otherwise, fallback to what the driver originally
set via its 'init' routine.
Signed-off-by: Jason Baron <jbaron@akamai.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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There are cases where cpufreq_add_dev() may fail for some CPUs
during system resume. With the current code we will still have
sysfs cpufreq files for those CPUs and struct cpufreq_policy
would be already freed for them. Hence any operation on those
sysfs files would result in kernel warnings.
Example of problems resulting from resume errors (from Bjørn Mork):
WARNING: CPU: 0 PID: 6055 at fs/sysfs/file.c:343 sysfs_open_file+0x77/0x212()
missing sysfs attribute operations for kobject: (null)
Modules linked in: [stripped as irrelevant]
CPU: 0 PID: 6055 Comm: grep Tainted: G D 3.13.0-rc2 #153
Hardware name: LENOVO 2776LEG/2776LEG, BIOS 6EET55WW (3.15 ) 12/19/2011
0000000000000009 ffff8802327ebb78 ffffffff81380b0e 0000000000000006
ffff8802327ebbc8 ffff8802327ebbb8 ffffffff81038635 0000000000000000
ffffffff811823c7 ffff88021a19e688 ffff88021a19e688 ffff8802302f9310
Call Trace:
[<ffffffff81380b0e>] dump_stack+0x55/0x76
[<ffffffff81038635>] warn_slowpath_common+0x7c/0x96
[<ffffffff811823c7>] ? sysfs_open_file+0x77/0x212
[<ffffffff810386e3>] warn_slowpath_fmt+0x41/0x43
[<ffffffff81182dec>] ? sysfs_get_active+0x6b/0x82
[<ffffffff81182382>] ? sysfs_open_file+0x32/0x212
[<ffffffff811823c7>] sysfs_open_file+0x77/0x212
[<ffffffff81182350>] ? sysfs_schedule_callback+0x1ac/0x1ac
[<ffffffff81122562>] do_dentry_open+0x17c/0x257
[<ffffffff8112267e>] finish_open+0x41/0x4f
[<ffffffff81130225>] do_last+0x80c/0x9ba
[<ffffffff8112dbbd>] ? inode_permission+0x40/0x42
[<ffffffff81130606>] path_openat+0x233/0x4a1
[<ffffffff81130b7e>] do_filp_open+0x35/0x85
[<ffffffff8113b787>] ? __alloc_fd+0x172/0x184
[<ffffffff811232ea>] do_sys_open+0x6b/0xfa
[<ffffffff811233a7>] SyS_openat+0xf/0x11
[<ffffffff8138c812>] system_call_fastpath+0x16/0x1b
To fix this, remove those sysfs files or put the associated kobject
in case of such errors. Also, to make it simple, remove the cpufreq
sysfs links from all the CPUs (except for the policy->cpu) during
suspend, as that operation won't result in a loss of sysfs file
permissions and we can create those links during resume just fine.
Fixes: 5302c3fb2e62 ("cpufreq: Perform light-weight init/teardown during suspend/resume")
Reported-and-tested-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Cc: 3.12+ <stable@vger.kernel.org> # 3.12+
[rjw: Changelog]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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The function at32_cpufreq_driver_init was marked as __init but will be
called from inside the cpufreq framework. This lead to the following a
section mismatch during compilation:
WARNING: drivers/built-in.o(.data+0x2448): Section mismatch in reference
from the variable at32_driver to the function
.init.text:at32_cpufreq_driver_init()
The variable at32_driver references
the function __init at32_cpufreq_driver_init()
If the reference is valid then annotate the
variable with __init* or __refdata (see linux/init.h) or name the
variable:
*_template, *_timer, *_sht, *_ops, *_probe, *_probe_one, *_console
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>
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Commit 2167e2399dc5 (cpufreq: fix garbage kobjects on errors during
suspend/resume) breaks suspend/resume on Martin Ziegler's system
(hard lockup during resume), so revert it.
Fixes: 2167e2399dc5 (cpufreq: fix garbage kobjects on errors during suspend/resume)
References: https://bugzilla.kernel.org/show_bug.cgi?id=66751
Reported-by: Martin Ziegler <ziegler@uni-freiburg.de>
Cc: 3.12+ <stable@vger.kernel.org> # 3.12+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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Commit 5a87182aa21d (cpufreq: suspend governors on system
suspend/hibernate) causes hibernation problems to happen on
Bjørn Mork's and Paul Bolle's systems, so revert it.
Fixes: 5a87182aa21d (cpufreq: suspend governors on system suspend/hibernate)
Reported-by: Bjørn Mork <bjorn@mork.no>
Reported-by: Paul Bolle <pebolle@tiscali.nl>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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* pm-cpuidle:
cpuidle: Check for dev before deregistering it.
intel_idle: Fixed C6 state on Avoton/Rangeley processors
* pm-cpufreq:
cpufreq: fix garbage kobjects on errors during suspend/resume
cpufreq: suspend governors on system suspend/hibernate
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This is effectively a revert of commit 5302c3fb2e62 ("cpufreq: Perform
light-weight init/teardown during suspend/resume"), which enabled
suspend/resume optimizations leaving the sysfs files in place.
Errors during suspend/resume are not handled properly, leaving
dead sysfs attributes in case of failures. There are are number of
functions with special code for the "frozen" case, and all these
need to also have special error handling.
The problem is easy to demonstrate by making cpufreq_driver->init()
or cpufreq_driver->get() fail during resume.
The code is too complex for a simple fix, with split code paths
in multiple blocks within a number of functions. It is therefore
best to revert the patch enabling this code until the error handling
is in place.
Examples of problems resulting from resume errors:
WARNING: CPU: 0 PID: 6055 at fs/sysfs/file.c:343 sysfs_open_file+0x77/0x212()
missing sysfs attribute operations for kobject: (null)
Modules linked in: [stripped as irrelevant]
CPU: 0 PID: 6055 Comm: grep Tainted: G D 3.13.0-rc2 #153
Hardware name: LENOVO 2776LEG/2776LEG, BIOS 6EET55WW (3.15 ) 12/19/2011
0000000000000009 ffff8802327ebb78 ffffffff81380b0e 0000000000000006
ffff8802327ebbc8 ffff8802327ebbb8 ffffffff81038635 0000000000000000
ffffffff811823c7 ffff88021a19e688 ffff88021a19e688 ffff8802302f9310
Call Trace:
[<ffffffff81380b0e>] dump_stack+0x55/0x76
[<ffffffff81038635>] warn_slowpath_common+0x7c/0x96
[<ffffffff811823c7>] ? sysfs_open_file+0x77/0x212
[<ffffffff810386e3>] warn_slowpath_fmt+0x41/0x43
[<ffffffff81182dec>] ? sysfs_get_active+0x6b/0x82
[<ffffffff81182382>] ? sysfs_open_file+0x32/0x212
[<ffffffff811823c7>] sysfs_open_file+0x77/0x212
[<ffffffff81182350>] ? sysfs_schedule_callback+0x1ac/0x1ac
[<ffffffff81122562>] do_dentry_open+0x17c/0x257
[<ffffffff8112267e>] finish_open+0x41/0x4f
[<ffffffff81130225>] do_last+0x80c/0x9ba
[<ffffffff8112dbbd>] ? inode_permission+0x40/0x42
[<ffffffff81130606>] path_openat+0x233/0x4a1
[<ffffffff81130b7e>] do_filp_open+0x35/0x85
[<ffffffff8113b787>] ? __alloc_fd+0x172/0x184
[<ffffffff811232ea>] do_sys_open+0x6b/0xfa
[<ffffffff811233a7>] SyS_openat+0xf/0x11
[<ffffffff8138c812>] system_call_fastpath+0x16/0x1b
The failure to restore cpufreq devices on cancelled hibernation is
not a new bug. It is caused by the ACPI _PPC call failing unless the
hibernate is completed. This makes the acpi_cpufreq driver fail its
init.
Previously, the cpufreq device could be restored by offlining the
cpu temporarily. And as a complete hibernation cycle would do this,
it would be automatically restored most of the time. But after
commit 5302c3fb2e62 the leftover sysfs attributes will block any
device add action. Therefore offlining and onlining CPU 1 will no
longer restore the cpufreq object, and a complete suspend/resume
cycle will replace it with garbage.
Fixes: 5302c3fb2e62 ("cpufreq: Perform light-weight init/teardown during suspend/resume")
Cc: 3.12+ <stable@vger.kernel.org> # 3.12+
Signed-off-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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This patch adds cpufreq suspend/resume calls to dpm_{suspend|resume}_noirq()
for handling suspend/resume of cpufreq governors.
Lan Tianyu (Intel) & Jinhyuk Choi (Broadcom) found anr issue where
tunables configuration for clusters/sockets with non-boot CPUs was
getting lost after suspend/resume, as we were notifying governors
with CPUFREQ_GOV_POLICY_EXIT on removal of the last cpu for that
policy and so deallocating memory for tunables. This is fixed by
this patch as we don't allow any operation on governors after
device suspend and before device resume now.
Reported-and-tested-by: Lan Tianyu <tianyu.lan@intel.com>
Reported-by: Jinhyuk Choi <jinchoi@broadcom.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
[rjw: Changelog, minor cleanups]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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* pm-cpufreq:
cpufreq: exynos: Remove unwanted EXPORT_SYMBOL
cpufreq: tegra: don't error target() when suspended
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The init functions are linked statically (no support for
dynamic loading) and have no other users. Hence remove
EXPORT_SYMBOL for these functions.
Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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d4019f0a92ab "cpufreq: move freq change notifications to cpufreq core"
added code to the cpufreq core to print an error if a cpufreq driver's
.target() function returned an error. This exposed the fact that Tegra's
cpufreq driver returns an error when it is ignoring requests due to the
system being suspended.
Modify Tegra's .target() function not to return an error in this case;
this prevents the error prints. The argument is that since the suspend
hook can't and doesn't inform the cpufreq core when its requests will
be ignored, there's no way for the cpufreq core to squelch them, so it's
not an error for the requests to keep coming. This change make the Tegra
driver consistent with how the Exynos handles the same situation. Note
that s5pv210-cpufreq.c probably suffers from this same issue though.
Fixes: d4019f0a92ab (cpufreq: move freq change notifications to cpufreq core)
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Pull more ACPI and power management updates from Rafael Wysocki:
- ACPI-based device hotplug fixes for issues introduced recently and a
fix for an older error code path bug in the ACPI PCI host bridge
driver
- Fix for recently broken OMAP cpufreq build from Viresh Kumar
- Fix for a recent hibernation regression related to s2disk
- Fix for a locking-related regression in the ACPI EC driver from
Puneet Kumar
- System suspend error code path fix related to runtime PM and runtime
PM documentation update from Ulf Hansson
- cpufreq's conservative governor fix from Xiaoguang Chen
- New processor IDs for intel_idle and turbostat and removal of an
obsolete Kconfig option from Len Brown
- New device IDs for the ACPI LPSS (Low-Power Subsystem) driver and
ACPI-based PCI hotplug (ACPIPHP) cleanup from Mika Westerberg
- Removal of several ACPI video DMI blacklist entries that are not
necessary any more from Aaron Lu
- Rework of the ACPI companion representation in struct device and code
cleanup related to that change from Rafael J Wysocki, Lan Tianyu and
Jarkko Nikula
- Fixes for assigning names to ACPI-enumerated I2C and SPI devices from
Jarkko Nikula
* tag 'pm+acpi-2-3.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (24 commits)
PCI / hotplug / ACPI: Drop unused acpiphp_debug declaration
ACPI / scan: Set flags.match_driver in acpi_bus_scan_fixed()
ACPI / PCI root: Clear driver_data before failing enumeration
ACPI / hotplug: Fix PCI host bridge hot removal
ACPI / hotplug: Fix acpi_bus_get_device() return value check
cpufreq: governor: Remove fossil comment in the cpufreq_governor_dbs()
ACPI / video: clean up DMI table for initial black screen problem
ACPI / EC: Ensure lock is acquired before accessing ec struct members
PM / Hibernate: Do not crash kernel in free_basic_memory_bitmaps()
ACPI / AC: Remove struct acpi_device pointer from struct acpi_ac
spi: Use stable dev_name for ACPI enumerated SPI slaves
i2c: Use stable dev_name for ACPI enumerated I2C slaves
ACPI: Provide acpi_dev_name accessor for struct acpi_device device name
ACPI / bind: Use (put|get)_device() on ACPI device objects too
ACPI: Eliminate the DEVICE_ACPI_HANDLE() macro
ACPI / driver core: Store an ACPI device pointer in struct acpi_dev_node
cpufreq: OMAP: Fix compilation error 'r & ret undeclared'
PM / Runtime: Fix error path for prepare
PM / Runtime: Update documentation around probe|remove|suspend
cpufreq: conservative: set requested_freq to policy max when it is over policy max
...
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* pm-cpufreq:
cpufreq: governor: Remove fossil comment in the cpufreq_governor_dbs()
cpufreq: OMAP: Fix compilation error 'r & ret undeclared'
cpufreq: conservative: set requested_freq to policy max when it is over policy max
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The related code has been changed and the comment is out of date.
So remove it.
Signed-off-by: Lan Tianyu <tianyu.lan@intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
Pull trivial tree updates from Jiri Kosina:
"Usual earth-shaking, news-breaking, rocket science pile from
trivial.git"
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial: (23 commits)
doc: usb: Fix typo in Documentation/usb/gadget_configs.txt
doc: add missing files to timers/00-INDEX
timekeeping: Fix some trivial typos in comments
mm: Fix some trivial typos in comments
irq: Fix some trivial typos in comments
NUMA: fix typos in Kconfig help text
mm: update 00-INDEX
doc: Documentation/DMA-attributes.txt fix typo
DRM: comment: `halve' -> `half'
Docs: Kconfig: `devlopers' -> `developers'
doc: typo on word accounting in kprobes.c in mutliple architectures
treewide: fix "usefull" typo
treewide: fix "distingush" typo
mm/Kconfig: Grammar s/an/a/
kexec: Typo s/the/then/
Documentation/kvm: Update cpuid documentation for steal time and pv eoi
treewide: Fix common typo in "identify"
__page_to_pfn: Fix typo in comment
Correct some typos for word frequency
clk: fixed-factor: Fix a trivial typo
...
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git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Pull ACPI and power management updates from Rafael J Wysocki:
- New power capping framework and the the Intel Running Average Power
Limit (RAPL) driver using it from Srinivas Pandruvada and Jacob Pan.
- Addition of the in-kernel switching feature to the arm_big_little
cpufreq driver from Viresh Kumar and Nicolas Pitre.
- cpufreq support for iMac G5 from Aaro Koskinen.
- Baytrail processors support for intel_pstate from Dirk Brandewie.
- cpufreq support for Midway/ECX-2000 from Mark Langsdorf.
- ARM vexpress/TC2 cpufreq support from Sudeep KarkadaNagesha.
- ACPI power management support for the I2C and SPI bus types from Mika
Westerberg and Lv Zheng.
- cpufreq core fixes and cleanups from Viresh Kumar, Srivatsa S Bhat,
Stratos Karafotis, Xiaoguang Chen, Lan Tianyu.
- cpufreq drivers updates (mostly fixes and cleanups) from Viresh
Kumar, Aaro Koskinen, Jungseok Lee, Sudeep KarkadaNagesha, Lukasz
Majewski, Manish Badarkhe, Hans-Christian Egtvedt, Evgeny Kapaev.
- intel_pstate updates from Dirk Brandewie and Adrian Huang.
- ACPICA update to version 20130927 includig fixes and cleanups and
some reduction of divergences between the ACPICA code in the kernel
and ACPICA upstream in order to improve the automatic ACPICA patch
generation process. From Bob Moore, Lv Zheng, Tomasz Nowicki, Naresh
Bhat, Bjorn Helgaas, David E Box.
- ACPI IPMI driver fixes and cleanups from Lv Zheng.
- ACPI hotplug fixes and cleanups from Bjorn Helgaas, Toshi Kani, Zhang
Yanfei, Rafael J Wysocki.
- Conversion of the ACPI AC driver to the platform bus type and
multiple driver fixes and cleanups related to ACPI from Zhang Rui.
- ACPI processor driver fixes and cleanups from Hanjun Guo, Jiang Liu,
Bartlomiej Zolnierkiewicz, Mathieu Rhéaume, Rafael J Wysocki.
- Fixes and cleanups and new blacklist entries related to the ACPI
video support from Aaron Lu, Felipe Contreras, Lennart Poettering,
Kirill Tkhai.
- cpuidle core cleanups from Viresh Kumar and Lorenzo Pieralisi.
- cpuidle drivers fixes and cleanups from Daniel Lezcano, Jingoo Han,
Bartlomiej Zolnierkiewicz, Prarit Bhargava.
- devfreq updates from Sachin Kamat, Dan Carpenter, Manish Badarkhe.
- Operation Performance Points (OPP) core updates from Nishanth Menon.
- Runtime power management core fix from Rafael J Wysocki and update
from Ulf Hansson.
- Hibernation fixes from Aaron Lu and Rafael J Wysocki.
- Device suspend/resume lockup detection mechanism from Benoit Goby.
- Removal of unused proc directories created for various ACPI drivers
from Lan Tianyu.
- ACPI LPSS driver fix and new device IDs for the ACPI platform scan
handler from Heikki Krogerus and Jarkko Nikula.
- New ACPI _OSI blacklist entry for Toshiba NB100 from Levente Kurusa.
- Assorted fixes and cleanups related to ACPI from Andy Shevchenko, Al
Stone, Bartlomiej Zolnierkiewicz, Colin Ian King, Dan Carpenter,
Felipe Contreras, Jianguo Wu, Lan Tianyu, Yinghai Lu, Mathias Krause,
Liu Chuansheng.
- Assorted PM fixes and cleanups from Andy Shevchenko, Thierry Reding,
Jean-Christophe Plagniol-Villard.
* tag 'pm+acpi-3.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (386 commits)
cpufreq: conservative: fix requested_freq reduction issue
ACPI / hotplug: Consolidate deferred execution of ACPI hotplug routines
PM / runtime: Use pm_runtime_put_sync() in __device_release_driver()
ACPI / event: remove unneeded NULL pointer check
Revert "ACPI / video: Ignore BIOS initial backlight value for HP 250 G1"
ACPI / video: Quirk initial backlight level 0
ACPI / video: Fix initial level validity test
intel_pstate: skip the driver if ACPI has power mgmt option
PM / hibernate: Avoid overflow in hibernate_preallocate_memory()
ACPI / hotplug: Do not execute "insert in progress" _OST
ACPI / hotplug: Carry out PCI root eject directly
ACPI / hotplug: Merge device hot-removal routines
ACPI / hotplug: Make acpi_bus_hot_remove_device() internal
ACPI / hotplug: Simplify device ejection routines
ACPI / hotplug: Fix handle_root_bridge_removal()
ACPI / hotplug: Refuse to hot-remove all objects with disabled hotplug
ACPI / scan: Start matching drivers after trying scan handlers
ACPI: Remove acpi_pci_slot_init() headers from internal.h
ACPI / blacklist: fix name of ThinkPad Edge E530
PowerCap: Fix build error with option -Werror=format-security
...
Conflicts:
arch/arm/mach-omap2/opp.c
drivers/Kconfig
drivers/spi/spi.c
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With a recent change "d4019f0 cpufreq: move freq change notifications to cpufreq
core" few variables (r & ret) are removed by mistake and hence these warnings:
drivers/cpufreq/omap-cpufreq.c: In function omap_target:
drivers/cpufreq/omap-cpufreq.c:64:2: error: ret undeclared (first use in this function)
drivers/cpufreq/omap-cpufreq.c:64:2: note: each undeclared identifier is reported only once for each function it appears in
drivers/cpufreq/omap-cpufreq.c:94:3: error: r undeclared (first use in this function)
drivers/cpufreq/omap-cpufreq.c:116:1: warning: control reaches end of non-void function [-Wreturn-type]
Lets fix them by declaring those variables again.
Fixes: d4019f0a92ab (cpufreq: move freq change notifications to cpufreq core)
Reported-by: Sebastian Capella <sebastian.capella@linaro.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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policy max
When requested_freq is over policy->max, set it to policy->max.
This can help to speed up decreasing frequency.
Signed-off-by: Xiaoguang Chen <chenxg@marvell.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux
Pull devicetree updates from Rob Herring:
"DeviceTree updates for 3.13. This is a bit larger pull request than
usual for this cycle with lots of clean-up.
- Cross arch clean-up and consolidation of early DT scanning code.
- Clean-up and removal of arch prom.h headers. Makes arch specific
prom.h optional on all but Sparc.
- Addition of interrupts-extended property for devices connected to
multiple interrupt controllers.
- Refactoring of DT interrupt parsing code in preparation for
deferred probe of interrupts.
- ARM cpu and cpu topology bindings documentation.
- Various DT vendor binding documentation updates"
* tag 'devicetree-for-3.13' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux: (82 commits)
powerpc: add missing explicit OF includes for ppc
dt/irq: add empty of_irq_count for !OF_IRQ
dt: disable self-tests for !OF_IRQ
of: irq: Fix interrupt-map entry matching
MIPS: Netlogic: replace early_init_devtree() call
of: Add Panasonic Corporation vendor prefix
of: Add Chunghwa Picture Tubes Ltd. vendor prefix
of: Add AU Optronics Corporation vendor prefix
of/irq: Fix potential buffer overflow
of/irq: Fix bug in interrupt parsing refactor.
of: set dma_mask to point to coherent_dma_mask
of: add vendor prefix for PHYTEC Messtechnik GmbH
DT: sort vendor-prefixes.txt
of: Add vendor prefix for Cadence
of: Add empty for_each_available_child_of_node() macro definition
arm/versatile: Fix versatile irq specifications.
of/irq: create interrupts-extended property
microblaze/pci: Drop PowerPC-ism from irq parsing
of/irq: Create of_irq_parse_and_map_pci() to consolidate arch code.
of/irq: Use irq_of_parse_and_map()
...
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git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
Pull ARM SoC platform changes from Olof Johansson:
"New and updated SoC support. Among the things new for this release
are:
- More support for the AM33xx platforms from TI
- Tegra 124 support, and some updates to older tegra families as well
- imx cleanups and updates across the board
- A rename of Broadcom's Mobile platforms which were introduced as
ARCH_BCM, and turned out to be too broad a name. New name is
ARCH_BCM_MOBILE.
- A whole bunch of updates and fixes for integrator, making the
platform code more modern and switches over to DT-only booting.
- Support for two new Renesas shmobile chipsets. Next up for them is
more work on consolidation instead of introduction of new
non-multiplatform SoCs, we're all looking forward to that!
- Misc cleanups for older Samsung platforms, some Allwinner updates,
etc"
* tag 'soc-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (159 commits)
ARM: bcm281xx: Add ARCH_BCM_MOBILE to bcm config
ARM: bcm_defconfig: Run "make savedefconfig"
ARM: bcm281xx: Add ARCH Timers to config
rename ARCH_BCM to ARCH_BCM_MOBILE (mach-bcm)
ARM: vexpress: Enable platform-specific options in defconfig
ARM: vexpress: Make defconfig work again
ARM: sunxi: remove .init_time hooks
ARM: imx: enable suspend for imx6sl
ARM: imx: ensure dsm_request signal is not asserted when setting LPM
ARM: imx6q: call WB and RBC configuration from imx6q_pm_enter()
ARM: imx6q: move low-power code out of clock driver
ARM: imx: drop extern with function prototypes in common.h
ARM: imx: reset core along with enable/disable operation
ARM: imx: do not return from imx_cpu_die() call
ARM: imx_v6_v7_defconfig: Select CONFIG_PROVE_LOCKING
ARM: imx_v6_v7_defconfig: Enable LEDS_GPIO related options
ARM: mxs_defconfig: Turn off CONFIG_DEBUG_GPIO
ARM: imx: replace imx6q_restart() with mxc_restart()
ARM: mach-imx: mm-imx5: Retrieve iomuxc base address from dt
ARM: mach-imx: mm-imx5: Retrieve tzic base address from dt
...
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* pm-cpufreq:
cpufreq: conservative: fix requested_freq reduction issue
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When decreasing frequency, requested_freq may be less than
freq_target, So requested_freq minus freq_target may be negative,
But reqested_freq's unit is unsigned int, then the negative result
will be one larger interger which may be even higher than
requested_freq.
This patch is to fix such issue. when result becomes negative,
set requested_freq as the min value of policy.
Signed-off-by: Xiaoguang Chen <chenxg@marvell.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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* pm-cpufreq:
intel_pstate: skip the driver if ACPI has power mgmt option
cpufreq: ondemand: Remove redundant return statement
cpufreq: move freq change notifications to cpufreq core
cpufreq: distinguish drivers that do asynchronous notifications
cpufreq/intel_pstate: Add static declarations to internal functions
cpufreq: arm_big_little: reconfigure switcher behavior at run time
cpufreq: arm_big_little: add in-kernel switching (IKS) support
ARM: vexpress/TC2: register vexpress-spc cpufreq device
cpufreq: arm_big_little: add vexpress SPC interface driver
ARM: vexpress/TC2: add cpu clock support
ARM: vexpress/TC2: add support for CPU DVFS
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Do not load the Intel pstate driver if the platform firmware
(ACPI BIOS) supports the power management alternatives.
The ACPI BIOS indicates that the OS control mode can be used
if the _PSS (Performance Supported States) is defined in ACPI
table. For the OS control mode, the Intel pstate driver will be
loaded.
HP BIOS has several power management modes (firmware, OS-control and
so on). For the OS control mode in HP BIOS, the Intel p-state driver
will be loaded. When the customer chooses the firmware power
management in HP BIOS, the Intel p-state driver will be ignored.
I put hw_vendor_info vendor_info in case other vendors (Dell, Lenovo...)
have their firmware power management. Vendors should make sure their
firmware power management works properly, and they can go for adding
their vendor info to the variable.
I have verified the patch on HP ProLiant servers. The patch worked
correctly.
Signed-off-by: Adrian Huang <adrianhuang0701@gmail.com>
[rjw: Fixed up !CONFIG_ACPI build]
[Linda Knippers: As Adrian has recently left HP, I retested the
updated patch on an HP ProLiant server and verified that it is
behaving correctly. When the BIOS is configured for OS control for
power management, the intel_pstate driver loads as expected. When
the BIOS is configured to provide the power management, the
intel_pstate driver does not load and we get the pcc_cpufreq driver
instead.]
Signed-off-by: Linda Knippers <linda.knippers@hp.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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After commit dfa5bb622555 (cpufreq: ondemand: Change the calculation
of target frequency), this return statement is no longer needed.
Reported-by: Henrik Nilsson <Karl.Henrik.Nilsson@gmail.com>
Signed-off-by: Stratos Karafotis <stratosk@semaphore.gr>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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Most of the drivers do following in their ->target_index() routines:
struct cpufreq_freqs freqs;
freqs.old = old freq...
freqs.new = new freq...
cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
/* Change rate here */
cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
This is replicated over all cpufreq drivers today and there doesn't exists a
good enough reason why this shouldn't be moved to cpufreq core instead.
There are few special cases though, like exynos5440, which doesn't do everything
on the call to ->target_index() routine and call some kind of bottom halves for
doing this work, work/tasklet/etc..
They may continue doing notification from their own code as flag:
CPUFREQ_ASYNC_NOTIFICATION is already set for them.
All drivers are also modified in this patch to avoid breaking 'git bisect', as
double notification would happen otherwise.
Acked-by: Hans-Christian Egtvedt <egtvedt@samfundet.no>
Acked-by: Jesper Nilsson <jesper.nilsson@axis.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Russell King <linux@arm.linux.org.uk>
Acked-by: Stephen Warren <swarren@nvidia.com>
Tested-by: Andrew Lunn <andrew@lunn.ch>
Tested-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Reviewed-by: Lan Tianyu <tianyu.lan@intel.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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There are few special cases like exynos5440 which doesn't send POSTCHANGE
notification from their ->target() routine and call some kind of bottom halves
for doing this work, work/tasklet/etc.. From which they finally send POSTCHANGE
notification.
Its better if we distinguish them from other cpufreq drivers in some way so that
core can handle them specially. So this patch introduces another flag:
CPUFREQ_ASYNC_NOTIFICATION, which will be set by such drivers.
This also changes exynos5440-cpufreq.c and powernow-k8 in order to set this
flag.
Acked-by: Amit Daniel Kachhap <amit.daniel@samsung.com>
Acked-by: Kukjin Kim <kgene.kim@samsung.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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Fixes warnings reported by kbuild test robot
sparse warnings: (new ones prefixed by >>)
drivers/cpufreq/intel_pstate.c:729:6: sparse: symbol 'copy_pid_params' was not declared. Should it be static?
drivers/cpufreq/intel_pstate.c:739:6: sparse: symbol 'copy_cpu_funcs' was not declared. Should it be static?
Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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The b.L switcher can be turned on/off at run time. It is therefore
necessary to change the cpufreq driver behavior accordingly.
The driver must be unregistered/registered with the cpufreq core
to reconfigure freq tables for the virtual or actual CPUs. This is
accomplished via the b.L switcher notifier callback.
Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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This patch adds IKS (In Kernel Switcher) support to cpufreq driver.
This creates a combined freq table for A7-A15 CPU pairs. A7 frequencies
are virtualized and scaled down to half the actual frequencies to
approximate a linear scale across the combined A7+A15 range. When the
requested frequency change crosses the A7-A15 boundary a cluster switch
is invoked.
Based on earlier work from Sudeep KarkadaNagesha.
Signed-off-by: Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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The TC2(i.e. CA15_A7) Versatile Express has external Cortex M3 based
power controller which is responsible for CPU DVFS and SPC provides
the interface for the same.
This patch adds a tiny interface driver to check if OPPs are
initialised by SPC platform code and register the arm_big_little
cpufreq driver.
Signed-off-by: Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>
Acked-by: Nicolas Pitre <nico@linaro.org>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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* pm-cpufreq: (167 commits)
cpufreq: create per policy rwsem instead of per CPU cpu_policy_rwsem
intel_pstate: Add Baytrail support
intel_pstate: Refactor driver to support CPUs with different MSR layouts
cpufreq: Implement light weight ->target_index() routine
PM / OPP: rename header to linux/pm_opp.h
PM / OPP: rename data structures to dev_pm equivalents
PM / OPP: rename functions to dev_pm_opp*
cpufreq / governor: Remove fossil comment
cpufreq: exynos4210: Use the common clock framework to set APLL clock rate
cpufreq: exynos4x12: Use the common clock framework to set APLL clock rate
cpufreq: Detect spurious invocations of update_policy_cpu()
cpufreq: pmac64: enable cpufreq on iMac G5 (iSight) model
cpufreq: pmac64: provide cpufreq transition latency for older G5 models
cpufreq: pmac64: speed up frequency switch
cpufreq: highbank-cpufreq: Enable Midway/ECX-2000
exynos-cpufreq: fix false return check from "regulator_set_voltage"
speedstep-centrino: Remove unnecessary braces
acpi-cpufreq: Add comment under ACPI_ADR_SPACE_SYSTEM_IO case
cpufreq: arm-big-little: use clk_get instead of clk_get_sys
cpufreq: exynos: Show a list of available frequencies
...
Conflicts:
drivers/devfreq/exynos/exynos5_bus.c
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* acpi-cleanup: (34 commits)
ACPI / proc: Remove alarm proc file
ACPI: Remove CONFIG_ACPI_PROCFS_POWER and cm_sbsc.c
ACPI / SBS: Remove SBS's proc directory
ACPI / Battery: Remove battery's proc directory
ACP / fan: trivial style cleanup
ACPI / processor: remove superfluous pr == NULL checks
ACPI / mm: use NUMA_NO_NODE
toshiba_acpi: convert acpi_evaluate_object() to acpi_evaluate_integer()
intel-smartconnect: convert acpi_evaluate_object() to acpi_evaluate_integer()
intel-rst: convert acpi_evaluate_object() to acpi_evaluate_integer()
fujitsu-laptop: convert acpi_evaluate_object() to acpi_evaluate_integer()
i2c-hid: convert acpi_evaluate_object() to acpi_evaluate_integer()
ACPI: dock: convert acpi_evaluate_object() to acpi_evaluate_integer()
acpi_processor: convert acpi_evaluate_object() to acpi_evaluate_integer()
pnpacpi: convert acpi_get_handle() to acpi_has_method()
wmi: convert acpi_get_handle() to acpi_has_method()
toshiba_acpi: convert acpi_get_handle() to acpi_has_method()
sony-laptop: convert acpi_get_handle() to acpi_has_method()
intel_menlow: convert acpi_get_handle() to acpi_has_method()
fujitsu-laptop: convert acpi_get_handle() to acpi_has_method()
...
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We have per-CPU cpu_policy_rwsem for cpufreq core, but we never use
all of them. We always use rwsem of policy->cpu and so we can
actually make this rwsem per policy instead.
This patch does this change. With this change other tricky situations
are also avoided now, like which lock to take while we are changing
policy->cpu, etc.
Suggested-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Tested-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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Add support for the Baytrail processor.
Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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Non-core processors have a different MSR layout to commumicate P state
information. Refactor the driver to use CPU dependent accessors to
P state information.
Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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Currently, the prototype of cpufreq_drivers target routines is:
int target(struct cpufreq_policy *policy, unsigned int target_freq,
unsigned int relation);
And most of the drivers call cpufreq_frequency_table_target() to get a valid
index of their frequency table which is closest to the target_freq. And they
don't use target_freq and relation after that.
So, it makes sense to just do this work in cpufreq core before calling
cpufreq_frequency_table_target() and simply pass index instead. But this can be
done only with drivers which expose their frequency table with cpufreq core. For
others we need to stick with the old prototype of target() until those drivers
are converted to expose frequency tables.
This patch implements the new light weight prototype for target_index() routine.
It looks like this:
int target_index(struct cpufreq_policy *policy, unsigned int index);
CPUFreq core will call cpufreq_frequency_table_target() before calling this
routine and pass index to it. Because CPUFreq core now requires to call routines
present in freq_table.c CONFIG_CPU_FREQ_TABLE must be enabled all the time.
This also marks target() interface as deprecated. So, that new drivers avoid
using it. And Documentation is updated accordingly.
It also converts existing .target() to newly defined light weight
.target_index() routine for many driver.
Acked-by: Hans-Christian Egtvedt <egtvedt@samfundet.no>
Acked-by: Jesper Nilsson <jesper.nilsson@axis.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Russell King <linux@arm.linux.org.uk>
Acked-by: David S. Miller <davem@davemloft.net>
Tested-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rjw@rjwysocki.net>
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Conflicts:
drivers/cpufreq/omap-cpufreq.c
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Since Operating Performance Points (OPP) functions are specific
to device specific power management, be specific and rename opp.h
to pm_opp.h
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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Since Operating Performance Points (OPP) data structures are specific
to device specific power management, be specific and rename opp_* data
structures in OPP library with dev_pm_opp_* equivalent.
Affected structures are:
struct opp
enum opp_event
Minor checkpatch warning resulting of this change was fixed as well.
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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Since Operating Performance Points (OPP) functions are specific to
device specific power management, be specific and rename opp_*
accessors in OPP library with dev_pm_opp_* equivalent.
Affected functions are:
opp_get_voltage
opp_get_freq
opp_get_opp_count
opp_find_freq_exact
opp_find_freq_floor
opp_find_freq_ceil
opp_add
opp_enable
opp_disable
opp_get_notifier
opp_init_cpufreq_table
opp_free_cpufreq_table
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Nishanth Menon <nm@ti.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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Make acpi_cpufreq_init() return error codes when the driver cannot be
registered so that the module doesn't stay useless in memory and so
that acpi_cpufreq_exit() doesn't attempt to unregister things that
have never been registered when the module is unloaded.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
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The minimum pstate is supposed to be a percentage of the maximum P
state available. Calculate min using max pstate and not the
current max which may have been limited by the user
Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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This patch addresses Bug 60727
(https://bugzilla.kernel.org/show_bug.cgi?id=60727)
which was due to the truncation of intermediate values in the
calculations, which causes the code to consistently underestimate the
current cpu frequency, specifically 100% cpu utilization was truncated
down to the setpoint of 97%. This patch fixes the problem by keeping
the results of all intermediate calculations as fixed point numbers
rather scaling them back and forth between integers and fixed point.
References: https://bugzilla.kernel.org/show_bug.cgi?id=60727
Signed-off-by: Brennan Shacklett <bpshacklett@gmail.com>
Acked-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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cpufreq_set_policy() has been changed to origin __cpufreq_set_policy()
and policy->lock has been converted to rewrite lock by commit 5a01f2.
So remove the comment.
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Lan Tianyu <tianyu.lan@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
|
