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Power management fixes for v4.10-rc8

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- Add an intel_pstate driver quirk to work around a firmware setting
    that leads to frequency scaling issues on desktop Intel Kaby Lake
    processors in some configurations if the hardware-managed P-states
    (HWP) feature is in use (Srinivas Pandruvada).
 
  - Fix up the recently added brcmstb-avs cpufreq driver: fix a bug
    related to system suspend and change the sysfs interface to match
    the user space expectations (Markus Mayer).
 
  - Modify the runtime PM framework to avoid false-positive warnings
    from the might_sleep_if() assertions in it (Rafael Wysocki).
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Merge tag 'pm-4.10-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull power management fixes from Rafael Wysocki:
 "These add a quirk to intel_pstate to work around a firmware setting
  that leads to frequency scaling issues (discovered recently) on some
  Intel Kaby Lake processors, fix up the recently added brcmstb-avs
  cpufreq driver and avoid false-positive warnings from the runtime PM
  framework triggered by recent changes in i915.

  Specifics:

   - Add an intel_pstate driver quirk to work around a firmware setting
     that leads to frequency scaling issues on desktop Intel Kaby Lake
     processors in some configurations if the hardware-managed P-states
     (HWP) feature is in use (Srinivas Pandruvada)

   - Fix up the recently added brcmstb-avs cpufreq driver: fix a bug
     related to system suspend and change the sysfs interface to match
     the user space expectations (Markus Mayer)

   - Modify the runtime PM framework to avoid false-positive warnings
     from the might_sleep_if() assertions in it (Rafael Wysocki)"

* tag 'pm-4.10-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  PM / runtime: Avoid false-positive warnings from might_sleep_if()
  cpufreq: intel_pstate: Disable energy efficiency optimization
  cpufreq: brcmstb-avs-cpufreq: properly retrieve P-state upon suspend
  cpufreq: brcmstb-avs-cpufreq: extend sysfs entry brcm_avs_pmap
This commit is contained in:
Linus Torvalds 2017-02-06 15:11:04 -08:00
commit f7d6040aa4
3 changed files with 50 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
drivers/base/power/runtime.c
View File

@ -966,13 +966,13 @@ int __pm_runtime_idle(struct device *dev, int rpmflags)
unsigned long flags;
int retval;
might_sleep_if(!(rpmflags & RPM_ASYNC) && !dev->power.irq_safe);
if (rpmflags & RPM_GET_PUT) {
if (!atomic_dec_and_test(&dev->power.usage_count))
return 0;
}
might_sleep_if(!(rpmflags & RPM_ASYNC) && !dev->power.irq_safe);
spin_lock_irqsave(&dev->power.lock, flags);
retval = rpm_idle(dev, rpmflags);
spin_unlock_irqrestore(&dev->power.lock, flags);
@ -998,13 +998,13 @@ int __pm_runtime_suspend(struct device *dev, int rpmflags)
unsigned long flags;
int retval;
might_sleep_if(!(rpmflags & RPM_ASYNC) && !dev->power.irq_safe);
if (rpmflags & RPM_GET_PUT) {
if (!atomic_dec_and_test(&dev->power.usage_count))
return 0;
}
might_sleep_if(!(rpmflags & RPM_ASYNC) && !dev->power.irq_safe);
spin_lock_irqsave(&dev->power.lock, flags);
retval = rpm_suspend(dev, rpmflags);
spin_unlock_irqrestore(&dev->power.lock, flags);
@ -1029,7 +1029,8 @@ int __pm_runtime_resume(struct device *dev, int rpmflags)
unsigned long flags;
int retval;
might_sleep_if(!(rpmflags & RPM_ASYNC) && !dev->power.irq_safe);
might_sleep_if(!(rpmflags & RPM_ASYNC) && !dev->power.irq_safe &&
dev->power.runtime_status != RPM_ACTIVE);
if (rpmflags & RPM_GET_PUT)
atomic_inc(&dev->power.usage_count);

17
drivers/cpufreq/brcmstb-avs-cpufreq.c
View File

@ -784,8 +784,19 @@ static int brcm_avs_target_index(struct cpufreq_policy *policy,
static int brcm_avs_suspend(struct cpufreq_policy *policy)
{
struct private_data *priv = policy->driver_data;
int ret;
return brcm_avs_get_pmap(priv, &priv->pmap);
ret = brcm_avs_get_pmap(priv, &priv->pmap);
if (ret)
return ret;
/*
* We can't use the P-state returned by brcm_avs_get_pmap(), since
* that's the initial P-state from when the P-map was downloaded to the
* AVS co-processor, not necessarily the P-state we are running at now.
* So, we get the current P-state explicitly.
*/
return brcm_avs_get_pstate(priv, &priv->pmap.state);
}
static int brcm_avs_resume(struct cpufreq_policy *policy)
@ -954,9 +965,9 @@ static ssize_t show_brcm_avs_pmap(struct cpufreq_policy *policy, char *buf)
brcm_avs_parse_p1(pmap.p1, &mdiv_p0, &pdiv, &ndiv);
brcm_avs_parse_p2(pmap.p2, &mdiv_p1, &mdiv_p2, &mdiv_p3, &mdiv_p4);
return sprintf(buf, "0x%08x 0x%08x %u %u %u %u %u %u %u\n",
return sprintf(buf, "0x%08x 0x%08x %u %u %u %u %u %u %u %u %u\n",
pmap.p1, pmap.p2, ndiv, pdiv, mdiv_p0, mdiv_p1, mdiv_p2,
mdiv_p3, mdiv_p4);
mdiv_p3, mdiv_p4, pmap.mode, pmap.state);
}
static ssize_t show_brcm_avs_voltage(struct cpufreq_policy *policy, char *buf)

30
drivers/cpufreq/intel_pstate.c
View File

@ -1235,6 +1235,25 @@ static void intel_pstate_hwp_enable(struct cpudata *cpudata)
cpudata->epp_default = intel_pstate_get_epp(cpudata, 0);
}
#define MSR_IA32_POWER_CTL_BIT_EE 19
/* Disable energy efficiency optimization */
static void intel_pstate_disable_ee(int cpu)
{
u64 power_ctl;
int ret;
ret = rdmsrl_on_cpu(cpu, MSR_IA32_POWER_CTL, &power_ctl);
if (ret)
return;
if (!(power_ctl & BIT(MSR_IA32_POWER_CTL_BIT_EE))) {
pr_info("Disabling energy efficiency optimization\n");
power_ctl |= BIT(MSR_IA32_POWER_CTL_BIT_EE);
wrmsrl_on_cpu(cpu, MSR_IA32_POWER_CTL, power_ctl);
}
}
static int atom_get_min_pstate(void)
{
u64 value;
@ -1845,6 +1864,11 @@ static const struct x86_cpu_id intel_pstate_cpu_oob_ids[] __initconst = {
{}
};
static const struct x86_cpu_id intel_pstate_cpu_ee_disable_ids[] = {
ICPU(INTEL_FAM6_KABYLAKE_DESKTOP, core_params),
{}
};
static int intel_pstate_init_cpu(unsigned int cpunum)
{
struct cpudata *cpu;
@ -1875,6 +1899,12 @@ static int intel_pstate_init_cpu(unsigned int cpunum)
cpu->cpu = cpunum;
if (hwp_active) {
const struct x86_cpu_id *id;
id = x86_match_cpu(intel_pstate_cpu_ee_disable_ids);
if (id)
intel_pstate_disable_ee(cpunum);
intel_pstate_hwp_enable(cpu);
pid_params.sample_rate_ms = 50;
pid_params.sample_rate_ns = 50 * NSEC_PER_MSEC;