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Groups > linux.kernel > #1493366
| From | Jiri Slaby <jslaby@suse.cz> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH 3.12 068/119] cpufreq: Fix GOV_LIMITS handling for the userspace governor |
| Date | 2016-09-29 12:50 +0200 |
| Message-ID | <smH4D-2Z2-79@gated-at.bofh.it> (permalink) |
| References | <smGLf-2Ok-5@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
From: Sai Gurrappadi <sgurrappadi@nvidia.com>
3.12-stable review patch. If anyone has any objections, please let me know.
===============
commit e43e94c1eda76dabd686ddf6f7825f54d747b310 upstream.
Currently, the userspace governor only updates frequency on GOV_LIMITS
if policy->cur falls outside policy->{min/max}. However, it is also
necessary to update current frequency on GOV_LIMITS to match the user
requested value if it can be achieved within the new policy->{max/min}.
This was previously the behaviour in the governor until commit d1922f0
("cpufreq: Simplify userspace governor") which incorrectly assumed that
policy->cur == user requested frequency via scaling_setspeed. This won't
be true if the user requested frequency falls outside policy->{min/max}.
Ex: a temporary thermal cap throttled the user requested frequency.
Fix this by storing the user requested frequency in a seperate variable.
The governor will then try to achieve this request on every GOV_LIMITS
change.
Fixes: d1922f02562f (cpufreq: Simplify userspace governor)
Signed-off-by: Sai Gurrappadi <sgurrappadi@nvidia.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
drivers/cpufreq/cpufreq_userspace.c | 43 ++++++++++++++++++++++++++++++++-----
1 file changed, 38 insertions(+), 5 deletions(-)
diff --git a/drivers/cpufreq/cpufreq_userspace.c b/drivers/cpufreq/cpufreq_userspace.c
index 03078090b5f7..38b304f9dfb8 100644
--- a/drivers/cpufreq/cpufreq_userspace.c
+++ b/drivers/cpufreq/cpufreq_userspace.c
@@ -17,6 +17,7 @@
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mutex.h>
+#include <linux/slab.h>
static DEFINE_PER_CPU(unsigned int, cpu_is_managed);
static DEFINE_MUTEX(userspace_mutex);
@@ -31,6 +32,7 @@ static DEFINE_MUTEX(userspace_mutex);
static int cpufreq_set(struct cpufreq_policy *policy, unsigned int freq)
{
int ret = -EINVAL;
+ unsigned int *setspeed = policy->governor_data;
pr_debug("cpufreq_set for cpu %u, freq %u kHz\n", policy->cpu, freq);
@@ -38,6 +40,8 @@ static int cpufreq_set(struct cpufreq_policy *policy, unsigned int freq)
if (!per_cpu(cpu_is_managed, policy->cpu))
goto err;
+ *setspeed = freq;
+
/*
* We're safe from concurrent calls to ->target() here
* as we hold the userspace_mutex lock. If we were calling
@@ -60,19 +64,45 @@ static ssize_t show_speed(struct cpufreq_policy *policy, char *buf)
return sprintf(buf, "%u\n", policy->cur);
}
+static int cpufreq_userspace_policy_init(struct cpufreq_policy *policy)
+{
+ unsigned int *setspeed;
+
+ setspeed = kzalloc(sizeof(*setspeed), GFP_KERNEL);
+ if (!setspeed)
+ return -ENOMEM;
+
+ policy->governor_data = setspeed;
+ return 0;
+}
+
static int cpufreq_governor_userspace(struct cpufreq_policy *policy,
unsigned int event)
{
+ unsigned int *setspeed = policy->governor_data;
unsigned int cpu = policy->cpu;
int rc = 0;
+ if (event == CPUFREQ_GOV_POLICY_INIT)
+ return cpufreq_userspace_policy_init(policy);
+
+ if (!setspeed)
+ return -EINVAL;
+
switch (event) {
+ case CPUFREQ_GOV_POLICY_EXIT:
+ mutex_lock(&userspace_mutex);
+ policy->governor_data = NULL;
+ kfree(setspeed);
+ mutex_unlock(&userspace_mutex);
+ break;
case CPUFREQ_GOV_START:
BUG_ON(!policy->cur);
pr_debug("started managing cpu %u\n", cpu);
mutex_lock(&userspace_mutex);
per_cpu(cpu_is_managed, cpu) = 1;
+ *setspeed = policy->cur;
mutex_unlock(&userspace_mutex);
break;
case CPUFREQ_GOV_STOP:
@@ -80,20 +110,23 @@ static int cpufreq_governor_userspace(struct cpufreq_policy *policy,
mutex_lock(&userspace_mutex);
per_cpu(cpu_is_managed, cpu) = 0;
+ *setspeed = 0;
mutex_unlock(&userspace_mutex);
break;
case CPUFREQ_GOV_LIMITS:
mutex_lock(&userspace_mutex);
- pr_debug("limit event for cpu %u: %u - %u kHz, currently %u kHz\n",
- cpu, policy->min, policy->max,
- policy->cur);
+ pr_debug("limit event for cpu %u: %u - %u kHz, currently %u kHz, last set to %u kHz\n",
+ cpu, policy->min, policy->max, policy->cur, *setspeed);
- if (policy->max < policy->cur)
+ if (policy->max < *setspeed)
__cpufreq_driver_target(policy, policy->max,
CPUFREQ_RELATION_H);
- else if (policy->min > policy->cur)
+ else if (policy->min > *setspeed)
__cpufreq_driver_target(policy, policy->min,
CPUFREQ_RELATION_L);
+ else
+ __cpufreq_driver_target(policy, *setspeed,
+ CPUFREQ_RELATION_L);
mutex_unlock(&userspace_mutex);
break;
}
--
2.10.0
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[PATCH 3.12 118/119] avr32: fix 'undefined reference to `___copy_from_user' Jiri Slaby <jslaby@suse.cz> - 2016-09-29 12:40 +0200
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[PATCH 3.12 104/119] blackfin: fix copy_from_user() Jiri Slaby <jslaby@suse.cz> - 2016-09-29 12:40 +0200
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[PATCH 3.12 076/119] x86/mm/pat, /dev/mem: Remove superfluous error message Jiri Slaby <jslaby@suse.cz> - 2016-09-29 12:50 +0200
[PATCH 3.12 068/119] cpufreq: Fix GOV_LIMITS handling for the userspace governor Jiri Slaby <jslaby@suse.cz> - 2016-09-29 12:50 +0200
[PATCH 3.12 066/119] ALSA: timer: fix NULL pointer dereference on memory allocation failure Jiri Slaby <jslaby@suse.cz> - 2016-09-29 12:50 +0200
[PATCH 3.12 049/119] tcp: fix use after free in tcp_xmit_retransmit_queue() Jiri Slaby <jslaby@suse.cz> - 2016-09-29 12:50 +0200
[PATCH 3.12 026/119] gpio: Fix OF build problem on UM Jiri Slaby <jslaby@suse.cz> - 2016-09-29 13:00 +0200
[PATCH 3.12 027/119] fs/seq_file: fix out-of-bounds read Jiri Slaby <jslaby@suse.cz> - 2016-09-29 13:00 +0200
[PATCH 3.12 024/119] cdc-acm: fix wrong pipe type on rx interrupt xfers Jiri Slaby <jslaby@suse.cz> - 2016-09-29 13:00 +0200
[PATCH 3.12 036/119] Revert "can: fix handling of unmodifiable configuration options fix" Jiri Slaby <jslaby@suse.cz> - 2016-09-29 13:00 +0200
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[PATCH 3.12 028/119] Input: i8042 - break load dependency between atkbd/psmouse and i8042 Jiri Slaby <jslaby@suse.cz> - 2016-09-29 13:00 +0200
[PATCH 3.12 029/119] Input: i8042 - set up shared ps2_cmd_mutex for AUX ports Jiri Slaby <jslaby@suse.cz> - 2016-09-29 13:00 +0200
[PATCH 3.12 031/119] USB: fix typo in wMaxPacketSize validation Jiri Slaby <jslaby@suse.cz> - 2016-09-29 13:00 +0200
[PATCH 3.12 019/119] xhci: Make sure xhci handles USB_SPEED_SUPER_PLUS devices. Jiri Slaby <jslaby@suse.cz> - 2016-09-29 13:00 +0200
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[PATCH 3.12 023/119] aacraid: Check size values after double-fetch from user Jiri Slaby <jslaby@suse.cz> - 2016-09-29 13:00 +0200
[PATCH 3.12 034/119] staging: comedi: daqboard2000: bug fix board type matching code Jiri Slaby <jslaby@suse.cz> - 2016-09-29 13:00 +0200
[PATCH 3.12 002/119] x86/mm: Disable preemption during CR3 read+write Jiri Slaby <jslaby@suse.cz> - 2016-09-29 13:00 +0200
[PATCH 3.12 022/119] mac80211: fix purging multicast PS buffer queue Jiri Slaby <jslaby@suse.cz> - 2016-09-29 13:00 +0200
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[PATCH 3.12 016/119] USB: serial: option: add support for Telit LE920A4 Jiri Slaby <jslaby@suse.cz> - 2016-09-29 13:00 +0200
[PATCH 3.12 004/119] parisc: Fix order of EREFUSED define in errno.h Jiri Slaby <jslaby@suse.cz> - 2016-09-29 13:00 +0200
[PATCH 3.12 018/119] USB: serial: ftdi_sio: add PIDs for Ivium Technologies devices Jiri Slaby <jslaby@suse.cz> - 2016-09-29 13:00 +0200
[PATCH 3.12 030/119] crypto: nx - off by one bug in nx_of_update_msc() Jiri Slaby <jslaby@suse.cz> - 2016-09-29 13:00 +0200
[PATCH 3.12 025/119] megaraid_sas: Fix probing cards without io port Jiri Slaby <jslaby@suse.cz> - 2016-09-29 13:00 +0200
[PATCH 3.12 006/119] PCI: Add Netronome vendor and device IDs Jiri Slaby <jslaby@suse.cz> - 2016-09-29 13:00 +0200
[PATCH 3.12 032/119] USB: serial: mos7720: fix non-atomic allocation in write path Jiri Slaby <jslaby@suse.cz> - 2016-09-29 13:00 +0200
Re: [PATCH 3.12 000/119] 3.12.64-stable review Guenter Roeck <linux@roeck-us.net> - 2016-09-29 16:30 +0200
Re: [PATCH 3.12 000/119] 3.12.64-stable review Jiri Slaby <jslaby@suse.cz> - 2016-10-03 13:00 +0200
Re: [PATCH 3.12 000/119] 3.12.64-stable review Shuah Khan <shuah.kh@samsung.com> - 2016-09-29 19:20 +0200
Re: [PATCH 3.12 000/119] 3.12.64-stable review Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-09-30 07:30 +0200
Re: [PATCH 3.12 000/119] 3.12.64-stable review Jiri Slaby <jslaby@suse.cz> - 2016-09-30 08:50 +0200
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