25 Mar, 2020
2 commits
-
The new macro set has a consistent namespace and uses C99 initializers
instead of the grufty C89 ones.Get rid the of most local macro wrappers for consistency. The ones which
make sense for readability are renamed to X86_MATCH*.In the centrino driver this also removes the two extra duplicates of family
6 model 13 which have no value at all.Signed-off-by: Thomas Gleixner
Signed-off-by: Borislav Petkov
Reviewed-by: Greg Kroah-Hartman
Acked-by: Rafael J. Wysocki
Link: https://lkml.kernel.org/r/87eetheu88.fsf@nanos.tec.linutronix.de -
There is no reason that this gunk is in a generic header file. The wildcard
defines need to stay as they are required by file2alias.Signed-off-by: Thomas Gleixner
Signed-off-by: Borislav Petkov
Reviewed-by: Greg Kroah-Hartman
Link: https://lkml.kernel.org/r/20200320131508.736205164@linutronix.de
31 May, 2019
1 commit
-
Based on 1 normalized pattern(s):
this program is free software you can redistribute it and or modify
it under the terms of the gnu general public license as published by
the free software foundation either version 2 of the license or at
your option any later version this program is distributed in the
hope that it will be useful but without any warranty without even
the implied warranty of merchantability or fitness for a particular
purpose see the gnu general public license for more details you
should have received a copy of the gnu general public license along
with this program if not write to the free software foundation inc
59 temple place suite 330 boston ma 02111 1307 usaextracted by the scancode license scanner the SPDX license identifier
GPL-2.0-or-later
has been chosen to replace the boilerplate/reference in 1334 file(s).
Signed-off-by: Thomas Gleixner
Reviewed-by: Allison Randal
Reviewed-by: Richard Fontana
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de
Signed-off-by: Greg Kroah-Hartman
17 Apr, 2019
1 commit
-
WARNING: Prefer using '"%s...", __func__' to using function's name, in a
stringSwitch hardcoded function name with a reference to __func__ making the
code more maintainableSigned-off-by: Mohan Kumar
Acked-by: Viresh Kumar
Signed-off-by: Rafael J. Wysocki
20 Feb, 2019
1 commit
-
There is some rare cases where CPB (and possibly IDA) are missing on
processors.This is the case fixed by commit f7f3dc00f612 ("x86/cpu/AMD: Fix
erratum 1076 (CPB bit)") and following.In such context, the boost status isn't reported by
/sys/devices/system/cpu/cpufreq/boost.This commit is about printing a message to report that the CPU
doesn't expose the boost capabilities.This message could help debugging platforms hit by this phenomena.
Signed-off-by: Erwan Velu
[ rjw: Change the message text somewhat ]
Signed-off-by: Rafael J. Wysocki
28 Sep, 2018
1 commit
-
The Hygon Dhyana CPU supports ACPI P-States, and there is SMBus device
(PCI device ID 0x790b) on the Hygon platform. Add Hygon Dhyana support
to the cpufreq driver by using the code path of AMD family 17h.Signed-off-by: Pu Wen
Signed-off-by: Borislav Petkov
Acked-by: Rafael J. Wysocki
Cc: rjw@rjwysocki.net
Cc: viresh.kumar@linaro.org
Cc: bp@alien8.de
Cc: tglx@linutronix.de
Cc: mingo@redhat.com
Cc: hpa@zytor.com
Cc: x86@kernel.org
Cc: thomas.lendacky@amd.com
Cc: rafael@kernel.org
Cc: linux-pm@vger.kernel.org
Link: https://lkml.kernel.org/r/4db6f0f8537a93c172430c446a0297a6ab1c3c2d.1537533369.git.puwen@hygon.cn
13 Jun, 2018
2 commits
-
Pull more power management updates from Rafael Wysocki:
"These revert a recent PM core change that introduced a regression, fix
the build when the recently added Kryo cpufreq driver is selected, add
support for devices attached to multiple power domains to the generic
power domains (genpd) framework, add support for iowait boosting on
systens with hardware-managed P-states (HWP) enabled to the
intel_pstate driver, modify the behavior of the wakeup_count device
attribute in sysfs, fix a few issues and clean up some ugliness,
mostly in cpufreq (core and drivers) and in the cpupower utility.Specifics:
- Revert a recent PM core change that attempted to fix an issue
related to device links, but introduced a regression (Rafael
Wysocki)- Fix build when the recently added cpufreq driver for Kryo
processors is selected by making it possible to build that driver
as a module (Arnd Bergmann)- Fix the long idle detection mechanism in the out-of-band (ondemand
and conservative) cpufreq governors (Chen Yu)- Add support for devices in multiple power domains to the generic
power domains (genpd) framework (Ulf Hansson)- Add support for iowait boosting on systems with hardware-managed
P-states (HWP) enabled to the intel_pstate driver and make it use
that feature on systems with Skylake Xeon processors as it is
reported to improve performance significantly on those systems
(Srinivas Pandruvada)- Fix and update the acpi_cpufreq, ti-cpufreq and imx6q cpufreq
drivers (Colin Ian King, Suman Anna, Sébastien Szymanski)- Change the behavior of the wakeup_count device attribute in sysfs
to expose the number of events when the device might have aborted
system suspend in progress (Ravi Chandra Sadineni)- Fix two minor issues in the cpupower utility (Abhishek Goel, Colin
Ian King)"* tag 'pm-4.18-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
Revert "PM / runtime: Fixup reference counting of device link suppliers at probe"
cpufreq: imx6q: check speed grades for i.MX6ULL
cpufreq: governors: Fix long idle detection logic in load calculation
cpufreq: intel_pstate: enable boost for Skylake Xeon
PM / wakeup: Export wakeup_count instead of event_count via sysfs
PM / Domains: Add dev_pm_domain_attach_by_id() to manage multi PM domains
PM / Domains: Add support for multi PM domains per device to genpd
PM / Domains: Split genpd_dev_pm_attach()
PM / Domains: Don't attach devices in genpd with multi PM domains
PM / Domains: dt: Allow power-domain property to be a list of specifiers
cpufreq: intel_pstate: New sysfs entry to control HWP boost
cpufreq: intel_pstate: HWP boost performance on IO wakeup
cpufreq: intel_pstate: Add HWP boost utility and sched util hooks
cpufreq: ti-cpufreq: Use devres managed API in probe()
cpufreq: ti-cpufreq: Fix an incorrect error return value
cpufreq: ACPI: make function acpi_cpufreq_fast_switch() static
cpufreq: kryo: allow building as a loadable module
cpupower : Fix header name to read idle state name
cpupower: fix spelling mistake: "logilename" -> "logfilename" -
The kzalloc() function has a 2-factor argument form, kcalloc(). This
patch replaces cases of:kzalloc(a * b, gfp)
with:
kcalloc(a * b, gfp)as well as handling cases of:
kzalloc(a * b * c, gfp)
with:
kzalloc(array3_size(a, b, c), gfp)
as it's slightly less ugly than:
kzalloc_array(array_size(a, b), c, gfp)
This does, however, attempt to ignore constant size factors like:
kzalloc(4 * 1024, gfp)
though any constants defined via macros get caught up in the conversion.
Any factors with a sizeof() of "unsigned char", "char", and "u8" were
dropped, since they're redundant.The Coccinelle script used for this was:
// Fix redundant parens around sizeof().
@@
type TYPE;
expression THING, E;
@@(
kzalloc(
- (sizeof(TYPE)) * E
+ sizeof(TYPE) * E
, ...)
|
kzalloc(
- (sizeof(THING)) * E
+ sizeof(THING) * E
, ...)
)// Drop single-byte sizes and redundant parens.
@@
expression COUNT;
typedef u8;
typedef __u8;
@@(
kzalloc(
- sizeof(u8) * (COUNT)
+ COUNT
, ...)
|
kzalloc(
- sizeof(__u8) * (COUNT)
+ COUNT
, ...)
|
kzalloc(
- sizeof(char) * (COUNT)
+ COUNT
, ...)
|
kzalloc(
- sizeof(unsigned char) * (COUNT)
+ COUNT
, ...)
|
kzalloc(
- sizeof(u8) * COUNT
+ COUNT
, ...)
|
kzalloc(
- sizeof(__u8) * COUNT
+ COUNT
, ...)
|
kzalloc(
- sizeof(char) * COUNT
+ COUNT
, ...)
|
kzalloc(
- sizeof(unsigned char) * COUNT
+ COUNT
, ...)
)// 2-factor product with sizeof(type/expression) and identifier or constant.
@@
type TYPE;
expression THING;
identifier COUNT_ID;
constant COUNT_CONST;
@@(
- kzalloc
+ kcalloc
(
- sizeof(TYPE) * (COUNT_ID)
+ COUNT_ID, sizeof(TYPE)
, ...)
|
- kzalloc
+ kcalloc
(
- sizeof(TYPE) * COUNT_ID
+ COUNT_ID, sizeof(TYPE)
, ...)
|
- kzalloc
+ kcalloc
(
- sizeof(TYPE) * (COUNT_CONST)
+ COUNT_CONST, sizeof(TYPE)
, ...)
|
- kzalloc
+ kcalloc
(
- sizeof(TYPE) * COUNT_CONST
+ COUNT_CONST, sizeof(TYPE)
, ...)
|
- kzalloc
+ kcalloc
(
- sizeof(THING) * (COUNT_ID)
+ COUNT_ID, sizeof(THING)
, ...)
|
- kzalloc
+ kcalloc
(
- sizeof(THING) * COUNT_ID
+ COUNT_ID, sizeof(THING)
, ...)
|
- kzalloc
+ kcalloc
(
- sizeof(THING) * (COUNT_CONST)
+ COUNT_CONST, sizeof(THING)
, ...)
|
- kzalloc
+ kcalloc
(
- sizeof(THING) * COUNT_CONST
+ COUNT_CONST, sizeof(THING)
, ...)
)// 2-factor product, only identifiers.
@@
identifier SIZE, COUNT;
@@- kzalloc
+ kcalloc
(
- SIZE * COUNT
+ COUNT, SIZE
, ...)// 3-factor product with 1 sizeof(type) or sizeof(expression), with
// redundant parens removed.
@@
expression THING;
identifier STRIDE, COUNT;
type TYPE;
@@(
kzalloc(
- sizeof(TYPE) * (COUNT) * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
|
kzalloc(
- sizeof(TYPE) * (COUNT) * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
|
kzalloc(
- sizeof(TYPE) * COUNT * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
|
kzalloc(
- sizeof(TYPE) * COUNT * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
|
kzalloc(
- sizeof(THING) * (COUNT) * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
|
kzalloc(
- sizeof(THING) * (COUNT) * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
|
kzalloc(
- sizeof(THING) * COUNT * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
|
kzalloc(
- sizeof(THING) * COUNT * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
)// 3-factor product with 2 sizeof(variable), with redundant parens removed.
@@
expression THING1, THING2;
identifier COUNT;
type TYPE1, TYPE2;
@@(
kzalloc(
- sizeof(TYPE1) * sizeof(TYPE2) * COUNT
+ array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
, ...)
|
kzalloc(
- sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+ array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
, ...)
|
kzalloc(
- sizeof(THING1) * sizeof(THING2) * COUNT
+ array3_size(COUNT, sizeof(THING1), sizeof(THING2))
, ...)
|
kzalloc(
- sizeof(THING1) * sizeof(THING2) * (COUNT)
+ array3_size(COUNT, sizeof(THING1), sizeof(THING2))
, ...)
|
kzalloc(
- sizeof(TYPE1) * sizeof(THING2) * COUNT
+ array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
, ...)
|
kzalloc(
- sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+ array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
, ...)
)// 3-factor product, only identifiers, with redundant parens removed.
@@
identifier STRIDE, SIZE, COUNT;
@@(
kzalloc(
- (COUNT) * STRIDE * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kzalloc(
- COUNT * (STRIDE) * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kzalloc(
- COUNT * STRIDE * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kzalloc(
- (COUNT) * (STRIDE) * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kzalloc(
- COUNT * (STRIDE) * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kzalloc(
- (COUNT) * STRIDE * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kzalloc(
- (COUNT) * (STRIDE) * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kzalloc(
- COUNT * STRIDE * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
)// Any remaining multi-factor products, first at least 3-factor products,
// when they're not all constants...
@@
expression E1, E2, E3;
constant C1, C2, C3;
@@(
kzalloc(C1 * C2 * C3, ...)
|
kzalloc(
- (E1) * E2 * E3
+ array3_size(E1, E2, E3)
, ...)
|
kzalloc(
- (E1) * (E2) * E3
+ array3_size(E1, E2, E3)
, ...)
|
kzalloc(
- (E1) * (E2) * (E3)
+ array3_size(E1, E2, E3)
, ...)
|
kzalloc(
- E1 * E2 * E3
+ array3_size(E1, E2, E3)
, ...)
)// And then all remaining 2 factors products when they're not all constants,
// keeping sizeof() as the second factor argument.
@@
expression THING, E1, E2;
type TYPE;
constant C1, C2, C3;
@@(
kzalloc(sizeof(THING) * C2, ...)
|
kzalloc(sizeof(TYPE) * C2, ...)
|
kzalloc(C1 * C2 * C3, ...)
|
kzalloc(C1 * C2, ...)
|
- kzalloc
+ kcalloc
(
- sizeof(TYPE) * (E2)
+ E2, sizeof(TYPE)
, ...)
|
- kzalloc
+ kcalloc
(
- sizeof(TYPE) * E2
+ E2, sizeof(TYPE)
, ...)
|
- kzalloc
+ kcalloc
(
- sizeof(THING) * (E2)
+ E2, sizeof(THING)
, ...)
|
- kzalloc
+ kcalloc
(
- sizeof(THING) * E2
+ E2, sizeof(THING)
, ...)
|
- kzalloc
+ kcalloc
(
- (E1) * E2
+ E1, E2
, ...)
|
- kzalloc
+ kcalloc
(
- (E1) * (E2)
+ E1, E2
, ...)
|
- kzalloc
+ kcalloc
(
- E1 * E2
+ E1, E2
, ...)
)Signed-off-by: Kees Cook
06 Jun, 2018
1 commit
-
The acpi_cpufreq_fast_switch() function is local to the source and
does not need to be in global scope, so make it static.Cleans up sparse warning:
drivers/cpufreq/acpi-cpufreq.c:468:14: warning: symbol
'acpi_cpufreq_fast_switch' was not declared. Should it be static?Signed-off-by: Colin Ian King
Acked-by: Viresh Kumar
Signed-off-by: Rafael J. Wysocki
20 Mar, 2018
1 commit
-
The cpufreq core is already validating the CPU frequency table after
calling the ->init() callback of the cpufreq drivers and the drivers
don't need to do the same anymore. Though they need to set the
policy->freq_table field directly from the ->init() callback now.Stop validating the frequency table in the acpi-cpufreq driver.
The driver needs to crosscheck if the max frequency corresponds to the
P-state 0 or not and the same is done from the ->ready() callback now.Signed-off-by: Viresh Kumar
Signed-off-by: Rafael J. Wysocki
15 Feb, 2018
1 commit
-
x86_mask is a confusing name which is hard to associate with the
processor's stepping.Additionally, correct an indent issue in lib/cpu.c.
Signed-off-by: Jia Zhang
[ Updated it to more recent kernels. ]
Cc: Linus Torvalds
Cc: Peter Zijlstra
Cc: Thomas Gleixner
Cc: bp@alien8.de
Cc: tony.luck@intel.com
Link: http://lkml.kernel.org/r/1514771530-70829-1-git-send-email-qianyue.zj@alibaba-inc.com
Signed-off-by: Ingo Molnar
21 Dec, 2016
1 commit
-
Since CPU hotplug callbacks are requested for CPUHP_AP_ONLINE_DYN state,
successful callback initialization will result in cpuhp_setup_state()
returning a positive value. Therefore acpi_cpufreq_online being zero
indicates that callbacks have not been installed.This means that acpi_cpufreq_boost_exit() should only remove them if
acpi_cpufreq_online is positive. Trying to call
cpuhp_remove_state_nocalls(0) will cause a BUG().Signed-off-by: Boris Ostrovsky
Reviewed-by: Thomas Gleixner
Signed-off-by: Rafael J. Wysocki
28 Nov, 2016
2 commits
-
The online / pre_down callback is invoked on the target CPU since commit
1cf4f629d9d2 ("cpu/hotplug: Move online calls to hotplugged cpu") which means
for the hotplug callback we can use rmdsrl() instead of rdmsr_on_cpus().This leaves us with set_boost() as the only user which still needs to
read/write the MSR on different CPUs. There is no point in doing that
update on all cpus with the read modify write magic via per cpu data. We
simply can issue a function call on all online CPUs which also means that we
need half that many IPIs.Signed-off-by: Sebastian Andrzej Siewior
Acked-by: Viresh Kumar
Signed-off-by: Rafael J. Wysocki -
Install the callbacks via the state machine.
Signed-off-by: Sebastian Andrzej Siewior
Acked-by: Viresh Kumar
Signed-off-by: Rafael J. Wysocki
22 Jul, 2016
1 commit
-
A call to cpufreq_driver_resolve_freq will cache the mapping from
the desired target frequency to the frequency table index. If there
is a mapping for the desired target frequency then use it instead of
looking up the mapping again.Signed-off-by: Steve Muckle
Reviewed-by: Viresh Kumar
Signed-off-by: Rafael J. Wysocki
07 Jul, 2016
1 commit
-
This patch migrates few users of cpufreq tables to the new helpers
that work on sorted freq-tables.Signed-off-by: Viresh Kumar
Signed-off-by: Rafael J. Wysocki
09 Apr, 2016
4 commits
-
The freq-table is stored in struct cpufreq_policy also and there is
absolutely no need of keeping a copy of its reference in struct
acpi_cpufreq_data. Drop it.Also policy->freq_table can't be NULL in the target() callback, remove
the useless check as well.Signed-off-by: Viresh Kumar
[ rjw: Rebase ]
Signed-off-by: Rafael J. Wysocki -
Its always set by ->init() and so it will always be there in ->exit().
There is no need to have a special check for just that.Signed-off-by: Viresh Kumar
[ rjw: Rebase ]
Signed-off-by: Rafael J. Wysocki -
Use the more common kernel style adding a define for pr_fmt.
Miscellanea:
o Remove now unused PFX defines
Signed-off-by: Joe Perches
Acked-by: Viresh Kumar
Signed-off-by: Rafael J. Wysocki -
Use the more common logging style.
Miscellanea:
o Coalesce formats
o Realign arguments
o Add a missing space between a coalesced formatSigned-off-by: Joe Perches
Acked-by: Viresh Kumar
Signed-off-by: Rafael J. Wysocki
02 Apr, 2016
1 commit
-
Modify the ACPI cpufreq driver to provide a method for switching
CPU frequencies from interrupt context and update the cpufreq core
to support that method if available.Introduce a new cpufreq driver callback, ->fast_switch, to be
invoked for frequency switching from interrupt context by (future)
governors supporting that feature via (new) helper function
cpufreq_driver_fast_switch().Add two new policy flags, fast_switch_possible, to be set by the
cpufreq driver if fast frequency switching can be used for the
given policy and fast_switch_enabled, to be set by the governor
if it is going to use fast frequency switching for the given
policy. Also add a helper for setting the latter.Since fast frequency switching is inherently incompatible with
cpufreq transition notifiers, make it possible to set the
fast_switch_enabled only if there are no transition notifiers
already registered and make the registration of new transition
notifiers fail if fast_switch_enabled is set for at least one
policy.Implement the ->fast_switch callback in the ACPI cpufreq driver
and make it set fast_switch_possible during policy initialization
as appropriate.Signed-off-by: Rafael J. Wysocki
Acked-by: Viresh Kumar
23 Mar, 2016
1 commit
-
These frequency register read/write operations' implementations for the
given processor (Intel/AMD MSR access or I/O port access) are only used
internally in acpi-cpufreq, so make them static.Signed-off-by: Jisheng Zhang
Acked-by: Viresh Kumar
Signed-off-by: Rafael J. Wysocki
20 Mar, 2016
1 commit
-
This driver has two issues. First, it tries to fiddle with the hot
plugged CPU's MSR on the UP_PREPARE event, at a time when the CPU is
not yet online. Second, the driver sets the "boost-disable" bit for a
CPU when going down, but does not clear the bit again if the CPU comes
up again due to DOWN_FAILED.This patch fixes the issues by changing the driver to react to the
ONLINE/DOWN_FAILED events instead of UP_PREPARE. As an added benefit,
the driver also becomes symmetric with respect to the hot plug
mechanism.Signed-off-by: Richard Cochran
Signed-off-by: Rafael J. Wysocki
03 Mar, 2016
1 commit
-
Setting a new CPU frequency and reading the current request value
in the ACPI cpufreq driver involves each at least two switch
instructions (there's more if the policy is shared). One of
them is present in drv_read/write() that prepares a command
structure and the other happens in subsequent do_drv_read/write()
when that structure is interpreted. However, all of those switches
may be avoided by using function pointers.To that end, add two function pointers to struct acpi_cpufreq_data
to represent read and write operations on the frequency register
and set them up during policy intitialization to point to the pair
of routines suitable for the given processor (Intel/AMD MSR access
or I/O port access). Then, use those pointers in do_drv_read/write()
and modify drv_read/write() to prepare the command structure for
them without any checks.Signed-off-by: Rafael J. Wysocki
27 Feb, 2016
1 commit
-
The "out" label at the final return statement in acpi_cpufreq_target()
is totally pointless, so drop them and modify the code to return the
right values immediately instead of jumping to it.No functional changes.
Signed-off-by: Rafael J. Wysocki
Reviewed-by: Srinivas Pandruvada
Acked-by: Viresh Kumar
01 Jan, 2016
2 commits
-
Notice that the boost_supported field in struct cpufreq_driver is
redundant, because the driver's ->set_boost callback may be left
unset if "boost" is not supported. Moreover, the only driver
populating the ->set_boost callback is acpi_cpufreq, so make it
avoid populating that callback if "boost" is not supported, rework
the core to check ->set_boost instead of boost_supported to
verify "boost" support and drop boost_supported which isn't
used any more.Signed-off-by: Rafael J. Wysocki
Acked-by: Viresh Kumar -
The store_boost() routine is only used by store_cpb(), so move
the code from it directly to that function and rename _store_boost()
to set_boost() to make its name reflect the name of the driver
callback pointing to it.Signed-off-by: Rafael J. Wysocki
Acked-by: Viresh Kumar
09 Oct, 2015
1 commit
-
When freqdomain_cpus attribute is read from an offlined cpu, it will
cause crash. This change prevents calling cpufreq_show_cpus when
policy driver_data is NULL.Crash info:
[ 170.814949] BUG: unable to handle kernel NULL pointer dereference at 0000000000000018
[ 170.814990] IP: [] _find_next_bit.part.0+0x10/0x70
[ 170.815021] PGD 227d30067 PUD 229e56067 PMD 0
[ 170.815043] Oops: 0000 [#2] SMP
[ 170.816022] CPU: 3 PID: 3121 Comm: cat Tainted: G D OE 4.3.0-rc3+ #33
...
...
[ 170.816657] Call Trace:
[ 170.816672] [] ? find_next_bit+0x15/0x20
[ 170.816696] [] cpufreq_show_cpus+0x5c/0xd0
[ 170.816722] [] show_freqdomain_cpus+0x19/0x20 [acpi_cpufreq]
[ 170.816749] [] show+0x3b/0x60
[ 170.816769] [] sysfs_kf_seq_show+0xbc/0x130
[ 170.816793] [] kernfs_seq_show+0x23/0x30
[ 170.816816] [] seq_read+0xec/0x390
[ 170.816837] [] kernfs_fop_read+0x10a/0x160
[ 170.816861] [] __vfs_read+0x37/0x100
[ 170.816883] [] ? security_file_permission+0xa0/0xc0
[ 170.816909] [] vfs_read+0x83/0x130
[ 170.816930] [] SyS_read+0x55/0xc0
...
...
[ 170.817185] ---[ end trace bc6eadf82b2b965a ]---Signed-off-by: Srinivas Pandruvada
Acked-by: Viresh Kumar
Cc: 4.2+ # 4.2+
Signed-off-by: Rafael J. Wysocki
16 Sep, 2015
1 commit
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cpufreq_cpu_get() called by get_cur_freq_on_cpu() is overkill,
because the ->get() callback is always invoked in a context in
which all of the conditions checked by cpufreq_cpu_get() are
guaranteed to be satisfied.Use cpufreq_cpu_get_raw() instead of it and drop the
corresponding cpufreq_cpu_put() from get_cur_freq_on_cpu().Signed-off-by: Rafael J. Wysocki
Acked-by: Viresh Kumar
23 Jul, 2015
3 commits
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The cpb sysfs attribute is only exposed by the ACPI cpufreq driver
after a runtime check. For this purpose, the driver keeps a NULL
placeholder in its table of sysfs attributes and replaces the NULL
with a pointer to an attribute structure if it decides to expose
cpb.That is confusing, so make the driver set the pointer to the cpb
attribute structure upfront and replace it with NULL if the
attribute should not be exposed instead.Signed-off-by: Rafael J. Wysocki
Acked-by: Viresh Kumar -
After commit 8cfcfd39000d (acpi-cpufreq: Fix an ACPI perf unregister
issue) we store both a pointer to per-CPU data of the first policy
CPU and the number of that CPU which are redundant.Since the CPU number has to be stored anyway for the unregistration,
the pointer to the CPU's per-CPU data may be dropped and we can
access the data in question via per_cpu_ptr().Signed-off-by: Rafael J. Wysocki
Acked-by: Viresh Kumar -
acpi_processor_unregister_performance() actually doesn't use its
first argument, so drop it and update the callers accordingly.Signed-off-by: Rafael J. Wysocki
Acked-by: Viresh Kumar
17 Jul, 2015
2 commits
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As policy->cpu may not be same in acpi_cpufreq_cpu_init() and
acpi_cpufreq_cpu_exit(). There is a risk that we use different CPU
to un/register ACPI performance. So acpi_processor_unregister_performance()
may not be able to do the cleanup work. That causes a memory leak. And
if there will be another acpi_processor_register_performance() call,
it may also fail thanks to the internal check of pr->performace.So add a new struct acpi_cpufreq_data field, acpi_perf_cpu, to fix
this issue.Signed-off-by: Pan Xinhui
Acked-by: Viresh Kumar
[ rjw: Changelog ]
Signed-off-by: Rafael J. Wysocki -
Drivers can store their internal per-policy information in
policy->driver_data, lets use it.we have benefits after this replacing.
1) memory saving.
2) policy is shared by several cpus, per_cpu seems not correct. using
*driver_data* is more reasonable.
3) fix a memory leak in acpi_cpufreq_cpu_exit. as policy->cpu might
change during cpu hotplug. So sometimes we cant't free *data*, use
*driver_data* to fix it.
4) fix a zero return value of get_cur_freq_on_cpu. Only per_cpu of
policy->cpu is set to *data*, if we try to get cpufreq on other cpus, we
get zero instead of correct values. Use *driver_data* to fix it.Signed-off-by: Pan Xinhui
Acked-by: Viresh Kumar
Signed-off-by: Rafael J. Wysocki
27 May, 2015
1 commit
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The former duplicate the functionalities of the latter but are
neither documented nor arch-independent.Signed-off-by: Bartosz Golaszewski
Acked-by: Viresh Kumar
Acked-by: Rafael J. Wysocki
Cc: Benoit Cousson
Cc: Catalin Marinas
Cc: Fenghua Yu
Cc: Guenter Roeck
Cc: Jean Delvare
Cc: Jonathan Corbet
Cc: Linus Torvalds
Cc: Oleg Drokin
Cc: Peter Zijlstra
Cc: Russell King
Cc: Thomas Gleixner
Link: http://lkml.kernel.org/r/1432645896-12588-7-git-send-email-bgolaszewski@baylibre.com
Signed-off-by: Ingo Molnar
30 Apr, 2014
1 commit
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The cpufreq core now supports the cpufreq_for_each_entry and
cpufreq_for_each_valid_entry macros helpers for iteration over the
cpufreq_frequency_table, so use them.It should have no functional changes.
Signed-off-by: Stratos Karafotis
Acked-by: Lad, Prabhakar
Acked-by: Viresh Kumar
Signed-off-by: Rafael J. Wysocki
08 Apr, 2014
2 commits
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* pm-cpufreq:
cpufreq: ppc: Remove duplicate inclusion of fsl_soc.h
cpufreq: create another field .flags in cpufreq_frequency_table
cpufreq: use kzalloc() to allocate memory for cpufreq_frequency_table
cpufreq: don't print value of .driver_data from core
cpufreq: ia64: don't set .driver_data to index
cpufreq: powernv: Select CPUFreq related Kconfig options for powernv
cpufreq: powernv: Use cpufreq_frequency_table.driver_data to store pstate ids
cpufreq: powernv: cpufreq driver for powernv platform
cpufreq: at32ap: don't declare local variable as static
cpufreq: loongson2_cpufreq: don't declare local variable as static
cpufreq: unicore32: fix typo issue for 'clk'
cpufreq: exynos: Disable on multiplatform build -
Pull CPU hotplug notifiers registration fixes from Rafael Wysocki:
"The purpose of this single series of commits from Srivatsa S Bhat
(with a small piece from Gautham R Shenoy) touching multiple
subsystems that use CPU hotplug notifiers is to provide a way to
register them that will not lead to deadlocks with CPU online/offline
operations as described in the changelog of commit 93ae4f978ca7f ("CPU
hotplug: Provide lockless versions of callback registration
functions").The first three commits in the series introduce the API and document
it and the rest simply goes through the users of CPU hotplug notifiers
and converts them to using the new method"* tag 'cpu-hotplug-3.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (52 commits)
net/iucv/iucv.c: Fix CPU hotplug callback registration
net/core/flow.c: Fix CPU hotplug callback registration
mm, zswap: Fix CPU hotplug callback registration
mm, vmstat: Fix CPU hotplug callback registration
profile: Fix CPU hotplug callback registration
trace, ring-buffer: Fix CPU hotplug callback registration
xen, balloon: Fix CPU hotplug callback registration
hwmon, via-cputemp: Fix CPU hotplug callback registration
hwmon, coretemp: Fix CPU hotplug callback registration
thermal, x86-pkg-temp: Fix CPU hotplug callback registration
octeon, watchdog: Fix CPU hotplug callback registration
oprofile, nmi-timer: Fix CPU hotplug callback registration
intel-idle: Fix CPU hotplug callback registration
clocksource, dummy-timer: Fix CPU hotplug callback registration
drivers/base/topology.c: Fix CPU hotplug callback registration
acpi-cpufreq: Fix CPU hotplug callback registration
zsmalloc: Fix CPU hotplug callback registration
scsi, fcoe: Fix CPU hotplug callback registration
scsi, bnx2fc: Fix CPU hotplug callback registration
scsi, bnx2i: Fix CPU hotplug callback registration
...
07 Apr, 2014
1 commit
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Few drivers are using kmalloc() to allocate memory for frequency
tables and since we will have an additional field '.flags' in
'struct cpufreq_frequency_table', these might become unstable.
Better get these fixed by replacing kmalloc() by kzalloc() instead.Along with that we also remove use of .driver_data from SPEAr driver
as it doesn't use it at all. Also, writing zero to .driver_data is not
required for powernow-k8 as it is already zero.Reported-and-reviewed-by: Gautham R. Shenoy
Signed-off-by: Viresh Kumar
Signed-off-by: Rafael J. Wysocki
20 Mar, 2014
1 commit
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Subsystems that want to register CPU hotplug callbacks, as well as perform
initialization for the CPUs that are already online, often do it as shown
below:get_online_cpus();
for_each_online_cpu(cpu)
init_cpu(cpu);register_cpu_notifier(&foobar_cpu_notifier);
put_online_cpus();
This is wrong, since it is prone to ABBA deadlocks involving the
cpu_add_remove_lock and the cpu_hotplug.lock (when running concurrently
with CPU hotplug operations).Instead, the correct and race-free way of performing the callback
registration is:cpu_notifier_register_begin();
for_each_online_cpu(cpu)
init_cpu(cpu);/* Note the use of the double underscored version of the API */
__register_cpu_notifier(&foobar_cpu_notifier);cpu_notifier_register_done();
Fix the acpi-cpufreq code by using this latter form of callback registration.
Cc: Ingo Molnar
Acked-by: Viresh Kumar
Signed-off-by: Srivatsa S. Bhat
Signed-off-by: Rafael J. Wysocki
