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Power management fixes for v4.10-rc3

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- Fix a few intel_pstate driver issues: add missing locking it two places,
    avoid exposing a useless debugfs interface and keep the attribute
    values in sysfs in sync (Rafael Wysocki).
 
  - Drop confusing kernel-doc references related to power management and
    ACPI from the driver API manual (Rafael Wysocki).
 
  - Make a false-positive compiler warning in the generic power domains
    framework go away (Augusto Mecking Caringi).
 
  - Fix two initialization issues in the devfreq subsystem and update
    the MAINTAINERS entry for it (Chanwoo Choi).
 
  - Add a new "compatible" string for APM X-Gene 2 to the generic DT
    cpufreq driver (Hoan Tran).
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Merge tag 'pm-4.10-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull power management fixes from Rafael Wysocki:
 "These fix a few issues in the intel_pstate driver, a documetation
  issue, a false-positive compiler warning in the generic power domains
  framework and two problems in the devfreq subsystem. They also update
  the MAINTAINERS entry for devfreq and add a new "compatible" string to
  the generic cpufreq-dt driver.

  Specifics:

   - Fix a few intel_pstate driver issues: add missing locking it two
     places, avoid exposing a useless debugfs interface and keep the
     attribute values in sysfs in sync (Rafael Wysocki).

   - Drop confusing kernel-doc references related to power management
     and ACPI from the driver API manual (Rafael Wysocki).

   - Make a false-positive compiler warning in the generic power domains
     framework go away (Augusto Mecking Caringi).

   - Fix two initialization issues in the devfreq subsystem and update
     the MAINTAINERS entry for it (Chanwoo Choi).

   - Add a new "compatible" string for APM X-Gene 2 to the generic DT
     cpufreq driver (Hoan Tran)"

* tag 'pm-4.10-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  cpufreq: dt: Add support for APM X-Gene 2
  PM / devfreq: exynos-bus: Fix the wrong return value
  PM / devfreq: Fix the bug of devfreq_add_device when governor is NULL
  MAINTAINERS: Add myself as reviewer for DEVFREQ subsystem support
  PM / docs: Drop confusing kernel-doc references from infrastructure.rst
  PM / domains: Fix 'may be used uninitialized' build warning
  cpufreq: intel_pstate: Always keep all limits settings in sync
  cpufreq: intel_pstate: Use locking in intel_cpufreq_verify_policy()
  cpufreq: intel_pstate: Use locking in intel_pstate_resume()
  cpufreq: intel_pstate: Do not expose PID parameters in passive mode
This commit is contained in:
Linus Torvalds 2017-01-06 10:37:50 -08:00
commit b937a8697b
7 changed files with 46 additions and 43 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
Documentation/driver-api/infrastructure.rst
View File

@ -55,21 +55,6 @@ Device Drivers DMA Management
.. kernel-doc:: drivers/base/dma-mapping.c
:export:
Device Drivers Power Management
-------------------------------
.. kernel-doc:: drivers/base/power/main.c
:export:
Device Drivers ACPI Support
---------------------------
.. kernel-doc:: drivers/acpi/scan.c
:export:
.. kernel-doc:: drivers/acpi/scan.c
:internal:
Device drivers PnP support
--------------------------

1
MAINTAINERS
View File

@ -3800,6 +3800,7 @@ F: include/linux/devcoredump.h
DEVICE FREQUENCY (DEVFREQ)
M: MyungJoo Ham <myungjoo.ham@samsung.com>
M: Kyungmin Park <kyungmin.park@samsung.com>
R: Chanwoo Choi <cw00.choi@samsung.com>
L: linux-pm@vger.kernel.org
T: git git://git.kernel.org/pub/scm/linux/kernel/git/mzx/devfreq.git
S: Maintained

1
drivers/base/power/domain.c
View File

@ -626,6 +626,7 @@ static int genpd_runtime_resume(struct device *dev)
out:
/* Measure resume latency. */
time_start = 0;
if (timed && runtime_pm)
time_start = ktime_get();

2
drivers/cpufreq/cpufreq-dt-platdev.c
View File

@ -26,6 +26,8 @@ static const struct of_device_id machines[] __initconst = {
{ .compatible = "allwinner,sun8i-a83t", },
{ .compatible = "allwinner,sun8i-h3", },
{ .compatible = "apm,xgene-shadowcat", },
{ .compatible = "arm,integrator-ap", },
{ .compatible = "arm,integrator-cp", },

53
drivers/cpufreq/intel_pstate.c
View File

@ -857,13 +857,13 @@ static struct freq_attr *hwp_cpufreq_attrs[] = {
NULL,
};
static void intel_pstate_hwp_set(const struct cpumask *cpumask)
static void intel_pstate_hwp_set(struct cpufreq_policy *policy)
{
int min, hw_min, max, hw_max, cpu, range, adj_range;
struct perf_limits *perf_limits = limits;
u64 value, cap;
for_each_cpu(cpu, cpumask) {
for_each_cpu(cpu, policy->cpus) {
int max_perf_pct, min_perf_pct;
struct cpudata *cpu_data = all_cpu_data[cpu];
s16 epp;
@ -949,7 +949,7 @@ skip_epp:
static int intel_pstate_hwp_set_policy(struct cpufreq_policy *policy)
{
if (hwp_active)
intel_pstate_hwp_set(policy->cpus);
intel_pstate_hwp_set(policy);
return 0;
}
@ -968,19 +968,28 @@ static int intel_pstate_hwp_save_state(struct cpufreq_policy *policy)
static int intel_pstate_resume(struct cpufreq_policy *policy)
{
int ret;
if (!hwp_active)
return 0;
mutex_lock(&intel_pstate_limits_lock);
all_cpu_data[policy->cpu]->epp_policy = 0;
return intel_pstate_hwp_set_policy(policy);
ret = intel_pstate_hwp_set_policy(policy);
mutex_unlock(&intel_pstate_limits_lock);
return ret;
}
static void intel_pstate_hwp_set_online_cpus(void)
static void intel_pstate_update_policies(void)
{
get_online_cpus();
intel_pstate_hwp_set(cpu_online_mask);
put_online_cpus();
int cpu;
for_each_possible_cpu(cpu)
cpufreq_update_policy(cpu);
}
/************************** debugfs begin ************************/
@ -1018,10 +1027,6 @@ static void __init intel_pstate_debug_expose_params(void)
struct dentry *debugfs_parent;
int i = 0;
if (hwp_active ||
pstate_funcs.get_target_pstate == get_target_pstate_use_cpu_load)
return;
debugfs_parent = debugfs_create_dir("pstate_snb", NULL);
if (IS_ERR_OR_NULL(debugfs_parent))
return;
@ -1105,11 +1110,10 @@ static ssize_t store_no_turbo(struct kobject *a, struct attribute *b,
limits->no_turbo = clamp_t(int, input, 0, 1);
if (hwp_active)
intel_pstate_hwp_set_online_cpus();
mutex_unlock(&intel_pstate_limits_lock);
intel_pstate_update_policies();
return count;
}
@ -1134,11 +1138,10 @@ static ssize_t store_max_perf_pct(struct kobject *a, struct attribute *b,
limits->max_perf_pct);
limits->max_perf = div_ext_fp(limits->max_perf_pct, 100);
if (hwp_active)
intel_pstate_hwp_set_online_cpus();
mutex_unlock(&intel_pstate_limits_lock);
intel_pstate_update_policies();
return count;
}
@ -1163,11 +1166,10 @@ static ssize_t store_min_perf_pct(struct kobject *a, struct attribute *b,
limits->min_perf_pct);
limits->min_perf = div_ext_fp(limits->min_perf_pct, 100);
if (hwp_active)
intel_pstate_hwp_set_online_cpus();
mutex_unlock(&intel_pstate_limits_lock);
intel_pstate_update_policies();
return count;
}
@ -2153,8 +2155,12 @@ static int intel_cpufreq_verify_policy(struct cpufreq_policy *policy)
if (per_cpu_limits)
perf_limits = cpu->perf_limits;
mutex_lock(&intel_pstate_limits_lock);
intel_pstate_update_perf_limits(policy, perf_limits);
mutex_unlock(&intel_pstate_limits_lock);
return 0;
}
@ -2487,7 +2493,10 @@ hwp_cpu_matched:
if (rc)
goto out;
intel_pstate_debug_expose_params();
if (intel_pstate_driver == &intel_pstate && !hwp_active &&
pstate_funcs.get_target_pstate != get_target_pstate_use_cpu_load)
intel_pstate_debug_expose_params();
intel_pstate_sysfs_expose_params();
if (hwp_active)

15
drivers/devfreq/devfreq.c
View File

@ -593,11 +593,16 @@ struct devfreq *devfreq_add_device(struct device *dev,
list_add(&devfreq->node, &devfreq_list);
governor = find_devfreq_governor(devfreq->governor_name);
if (!IS_ERR(governor))
devfreq->governor = governor;
if (devfreq->governor)
err = devfreq->governor->event_handler(devfreq,
DEVFREQ_GOV_START, NULL);
if (IS_ERR(governor)) {
dev_err(dev, "%s: Unable to find governor for the device\n",
__func__);
err = PTR_ERR(governor);
goto err_init;
}
devfreq->governor = governor;
err = devfreq->governor->event_handler(devfreq, DEVFREQ_GOV_START,
NULL);
if (err) {
dev_err(dev, "%s: Unable to start governor for the device\n",
__func__);

2
drivers/devfreq/exynos-bus.c
View File

@ -497,7 +497,7 @@ passive:
if (IS_ERR(bus->devfreq)) {
dev_err(dev,
"failed to add devfreq dev with passive governor\n");
ret = -EPROBE_DEFER;
ret = PTR_ERR(bus->devfreq);
goto err;
}