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Message-ID: <1825858.9IUoltcDtD@kreacher>
Date: Thu, 27 Aug 2020 17:20:11 +0200
From: "Rafael J. Wysocki" <rjw@...ysocki.net>
To: Linux PM <linux-pm@...r.kernel.org>
Cc: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
LKML <linux-kernel@...r.kernel.org>,
Doug Smythies <dsmythies@...us.net>,
Artem Bityutskiy <artem.bityutskiy@...ux.intel.com>
Subject: [PATCH v3 4/5] cpufreq: intel_pstate: Add ->offline and ->online callbacks
From: "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Add ->offline and ->online driver callbacks to prepare for taking a
CPU offline and to restore its working configuration when it goes
back online, respectively, to avoid invoking the ->init callback on
every CPU online which is quite a bit of unnecessary overhead.
Define ->offline and ->online so that they can be used in the
passive mode as well as in the active mode and because ->offline
will do the majority of ->stop_cpu work, the passive mode does
not need that callback any more, so drop it from there.
Also modify the active mode ->suspend and ->resume callbacks to
prevent them from interfering with the new ->offline and ->online
ones in case the latter are invoked withing the system-wide suspend
and resume code flow and make the passive mode use them too.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
-> v2: Rearrange intel_pstate_init_cpu() to restore some of the previous
behavior of it to retain the current active-mode EPP management.
v2 -> v3:
* Fold the previous [5/5] in, rework intel_pstate_resume(), add
intel_pstate_suspend().
* Drop intel_pstate_hwp_save_state() and drop epp_saved from struct cpudata.
* Update the changelog.
---
drivers/cpufreq/intel_pstate.c | 139 +++++++++++++++++++++------------
1 file changed, 91 insertions(+), 48 deletions(-)
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index b308c39b6204..a265ccbcbbd7 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -219,14 +219,13 @@ struct global_params {
* @epp_policy: Last saved policy used to set EPP/EPB
* @epp_default: Power on default HWP energy performance
* preference/bias
- * @epp_saved: Saved EPP/EPB during system suspend or CPU offline
- * operation
* @epp_cached Cached HWP energy-performance preference value
* @hwp_req_cached: Cached value of the last HWP Request MSR
* @hwp_cap_cached: Cached value of the last HWP Capabilities MSR
* @last_io_update: Last time when IO wake flag was set
* @sched_flags: Store scheduler flags for possible cross CPU update
* @hwp_boost_min: Last HWP boosted min performance
+ * @suspended: Whether or not the driver has been suspended.
*
* This structure stores per CPU instance data for all CPUs.
*/
@@ -258,13 +257,13 @@ struct cpudata {
s16 epp_powersave;
s16 epp_policy;
s16 epp_default;
- s16 epp_saved;
s16 epp_cached;
u64 hwp_req_cached;
u64 hwp_cap_cached;
u64 last_io_update;
unsigned int sched_flags;
u32 hwp_boost_min;
+ bool suspended;
};
static struct cpudata **all_cpu_data;
@@ -871,12 +870,6 @@ static void intel_pstate_hwp_set(unsigned int cpu)
cpu_data->epp_policy = cpu_data->policy;
- if (cpu_data->epp_saved >= 0) {
- epp = cpu_data->epp_saved;
- cpu_data->epp_saved = -EINVAL;
- goto update_epp;
- }
-
if (cpu_data->policy == CPUFREQ_POLICY_PERFORMANCE) {
epp = intel_pstate_get_epp(cpu_data, value);
cpu_data->epp_powersave = epp;
@@ -903,7 +896,6 @@ static void intel_pstate_hwp_set(unsigned int cpu)
epp = cpu_data->epp_powersave;
}
-update_epp:
if (boot_cpu_has(X86_FEATURE_HWP_EPP)) {
value &= ~GENMASK_ULL(31, 24);
value |= (u64)epp << 24;
@@ -915,14 +907,24 @@ static void intel_pstate_hwp_set(unsigned int cpu)
wrmsrl_on_cpu(cpu, MSR_HWP_REQUEST, value);
}
-static void intel_pstate_hwp_force_min_perf(int cpu)
+static void intel_pstate_hwp_offline(struct cpudata *cpu)
{
- u64 value;
+ u64 value = READ_ONCE(cpu->hwp_req_cached);
int min_perf;
- value = all_cpu_data[cpu]->hwp_req_cached;
+ if (boot_cpu_has(X86_FEATURE_HWP_EPP)) {
+ /*
+ * In case the EPP has been set to "performance" by the
+ * active mode "performance" scaling algorithm, replace that
+ * temporary value with the cached EPP one.
+ */
+ value &= ~GENMASK_ULL(31, 24);
+ value |= HWP_ENERGY_PERF_PREFERENCE(cpu->epp_cached);
+ WRITE_ONCE(cpu->hwp_req_cached, value);
+ }
+
value &= ~GENMASK_ULL(31, 0);
- min_perf = HWP_LOWEST_PERF(all_cpu_data[cpu]->hwp_cap_cached);
+ min_perf = HWP_LOWEST_PERF(cpu->hwp_cap_cached);
/* Set hwp_max = hwp_min */
value |= HWP_MAX_PERF(min_perf);
@@ -932,19 +934,7 @@ static void intel_pstate_hwp_force_min_perf(int cpu)
if (boot_cpu_has(X86_FEATURE_HWP_EPP))
value |= HWP_ENERGY_PERF_PREFERENCE(HWP_EPP_POWERSAVE);
- wrmsrl_on_cpu(cpu, MSR_HWP_REQUEST, value);
-}
-
-static int intel_pstate_hwp_save_state(struct cpufreq_policy *policy)
-{
- struct cpudata *cpu_data = all_cpu_data[policy->cpu];
-
- if (!hwp_active)
- return 0;
-
- cpu_data->epp_saved = intel_pstate_get_epp(cpu_data, 0);
-
- return 0;
+ wrmsrl_on_cpu(cpu->cpu, MSR_HWP_REQUEST, value);
}
#define POWER_CTL_EE_ENABLE 1
@@ -971,8 +961,22 @@ static void set_power_ctl_ee_state(bool input)
static void intel_pstate_hwp_enable(struct cpudata *cpudata);
+static int intel_pstate_suspend(struct cpufreq_policy *policy)
+{
+ struct cpudata *cpu = all_cpu_data[policy->cpu];
+
+ pr_debug("CPU %d suspending\n", cpu->cpu);
+
+ cpu->suspended = true;
+
+ return 0;
+}
+
static int intel_pstate_resume(struct cpufreq_policy *policy)
{
+ struct cpudata *cpu = all_cpu_data[policy->cpu];
+
+ pr_debug("CPU %d resuming\n", cpu->cpu);
/* Only restore if the system default is changed */
if (power_ctl_ee_state == POWER_CTL_EE_ENABLE)
@@ -980,18 +984,22 @@ static int intel_pstate_resume(struct cpufreq_policy *policy)
else if (power_ctl_ee_state == POWER_CTL_EE_DISABLE)
set_power_ctl_ee_state(false);
- if (!hwp_active)
- return 0;
+ if (hwp_active) {
+ mutex_lock(&intel_pstate_limits_lock);
- mutex_lock(&intel_pstate_limits_lock);
+ /*
+ * Enable for all CPUs, because the boot CPU may not be the
+ * first one to resume.
+ */
+ intel_pstate_hwp_enable(cpu);
- if (policy->cpu == 0)
- intel_pstate_hwp_enable(all_cpu_data[policy->cpu]);
+ wrmsrl_on_cpu(cpu->cpu, MSR_HWP_REQUEST,
+ READ_ONCE(cpu->hwp_req_cached));
- all_cpu_data[policy->cpu]->epp_policy = 0;
- intel_pstate_hwp_set(policy->cpu);
+ mutex_unlock(&intel_pstate_limits_lock);
+ }
- mutex_unlock(&intel_pstate_limits_lock);
+ cpu->suspended = false;
return 0;
}
@@ -1440,7 +1448,6 @@ static void intel_pstate_hwp_enable(struct cpudata *cpudata)
wrmsrl_on_cpu(cpudata->cpu, MSR_HWP_INTERRUPT, 0x00);
wrmsrl_on_cpu(cpudata->cpu, MSR_PM_ENABLE, 0x1);
- cpudata->epp_policy = 0;
if (cpudata->epp_default == -EINVAL)
cpudata->epp_default = intel_pstate_get_epp(cpudata, 0);
}
@@ -2111,7 +2118,6 @@ static int intel_pstate_init_cpu(unsigned int cpunum)
cpu->epp_default = -EINVAL;
cpu->epp_powersave = -EINVAL;
- cpu->epp_saved = -EINVAL;
}
cpu = all_cpu_data[cpunum];
@@ -2122,6 +2128,7 @@ static int intel_pstate_init_cpu(unsigned int cpunum)
const struct x86_cpu_id *id;
intel_pstate_hwp_enable(cpu);
+ cpu->epp_policy = 0;
id = x86_match_cpu(intel_pstate_hwp_boost_ids);
if (id && intel_pstate_acpi_pm_profile_server())
@@ -2308,28 +2315,59 @@ static int intel_pstate_verify_policy(struct cpufreq_policy_data *policy)
return 0;
}
-static void intel_cpufreq_stop_cpu(struct cpufreq_policy *policy)
+static int intel_pstate_cpu_offline(struct cpufreq_policy *policy)
{
+ struct cpudata *cpu = all_cpu_data[policy->cpu];
+
+ pr_debug("CPU %d going offline\n", cpu->cpu);
+
+ if (cpu->suspended)
+ return 0;
+
+ intel_pstate_exit_perf_limits(policy);
+
+ /*
+ * If the CPU is an SMT thread and it goes offline with the performance
+ * settings different from the minimum, it will prevent its sibling
+ * from getting to lower performance levels, so force the minimum
+ * performance on CPU offline to prevent that from happening.
+ */
if (hwp_active)
- intel_pstate_hwp_force_min_perf(policy->cpu);
+ intel_pstate_hwp_offline(cpu);
else
- intel_pstate_set_min_pstate(all_cpu_data[policy->cpu]);
+ intel_pstate_set_min_pstate(cpu);
+
+ return 0;
}
-static void intel_pstate_stop_cpu(struct cpufreq_policy *policy)
+static int intel_pstate_cpu_online(struct cpufreq_policy *policy)
{
- pr_debug("CPU %d exiting\n", policy->cpu);
+ struct cpudata *cpu = all_cpu_data[policy->cpu];
+
+ pr_debug("CPU %d going online\n", cpu->cpu);
+
+ if (cpu->suspended)
+ return 0;
+
+ intel_pstate_init_acpi_perf_limits(policy);
- intel_pstate_clear_update_util_hook(policy->cpu);
if (hwp_active)
- intel_pstate_hwp_save_state(policy);
+ wrmsrl_on_cpu(policy->cpu, MSR_HWP_REQUEST,
+ READ_ONCE(cpu->hwp_req_cached));
+
+ return 0;
+}
+
+static void intel_pstate_stop_cpu(struct cpufreq_policy *policy)
+{
+ pr_debug("CPU %d stopping\n", policy->cpu);
- intel_cpufreq_stop_cpu(policy);
+ intel_pstate_clear_update_util_hook(policy->cpu);
}
static int intel_pstate_cpu_exit(struct cpufreq_policy *policy)
{
- intel_pstate_exit_perf_limits(policy);
+ pr_debug("CPU %d exiting\n", policy->cpu);
policy->fast_switch_possible = false;
@@ -2403,11 +2441,13 @@ static struct cpufreq_driver intel_pstate = {
.flags = CPUFREQ_CONST_LOOPS,
.verify = intel_pstate_verify_policy,
.setpolicy = intel_pstate_set_policy,
- .suspend = intel_pstate_hwp_save_state,
+ .suspend = intel_pstate_suspend,
.resume = intel_pstate_resume,
.init = intel_pstate_cpu_init,
.exit = intel_pstate_cpu_exit,
.stop_cpu = intel_pstate_stop_cpu,
+ .offline = intel_pstate_cpu_offline,
+ .online = intel_pstate_cpu_online,
.update_limits = intel_pstate_update_limits,
.name = "intel_pstate",
};
@@ -2662,7 +2702,10 @@ static struct cpufreq_driver intel_cpufreq = {
.fast_switch = intel_cpufreq_fast_switch,
.init = intel_cpufreq_cpu_init,
.exit = intel_cpufreq_cpu_exit,
- .stop_cpu = intel_cpufreq_stop_cpu,
+ .offline = intel_pstate_cpu_offline,
+ .online = intel_pstate_cpu_online,
+ .suspend = intel_pstate_suspend,
+ .resume = intel_pstate_resume,
.update_limits = intel_pstate_update_limits,
.name = "intel_cpufreq",
};
--
2.26.2
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