[PATCH 6.8 652/715] cpufreq: Fix per-policy boost behavior on SoCs using cpufreq_boost_set_sw()

Sasha Levin
2024-03-24T22:45:45Z

From: Sibi Sankar <quic_sibis@quicinc.com>

[ Upstream commit f37a4d6b4a2c77414e8b9d25dd5ee31537ce9b00 ]

In the existing code, per-policy flags don't have any impact i.e.
if cpufreq_driver boost is enabled and boost is disabled for one or
more of the policies, the cpufreq driver will behave as if boost is
enabled.

Fix this by incorporating per-policy boost flag in the policy->max
computation used in cpufreq_frequency_table_cpuinfo and setting the
default per-policy boost to mirror the cpufreq_driver boost flag.

Fixes: 218a06a79d9a ("cpufreq: Support per-policy performance boost")
Reported-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Dhruva Gole <d-gole@ti.com>
Signed-off-by: Sibi Sankar <quic_sibis@quicinc.com>
Tested-by:Yipeng Zou <zouyipeng@huawei.com> <mailto:zouyipeng@huawei.com>
Reviewed-by: Yipeng Zou <zouyipeng@huawei.com> <mailto:zouyipeng@huawei.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/cpufreq/cpufreq.c | 18 ++++++++++++------
drivers/cpufreq/freq_table.c | 2 +-
2 files changed, 13 insertions(+), 7 deletions(-)

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 44db4f59c4cc6..7d570b44777ac 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -644,14 +644,16 @@ static ssize_t store_local_boost(struct cpufreq_policy *policy,
if (policy->boost_enabled == enable)
return count;

+ policy->boost_enabled = enable;
+
cpus_read_lock();
ret = cpufreq_driver->set_boost(policy, enable);
cpus_read_unlock();

- if (ret)
+ if (ret) {
+ policy->boost_enabled = !policy->boost_enabled;
return ret;
-
- policy->boost_enabled = enable;
+ }

return count;
}
@@ -1419,6 +1421,9 @@ static int cpufreq_online(unsigned int cpu)
goto out_free_policy;
}

+ /* Let the per-policy boost flag mirror the cpufreq_driver boost during init */
+ policy->boost_enabled = cpufreq_boost_enabled() && policy_has_boost_freq(policy);
+
/*
* The initialization has succeeded and the policy is online.
* If there is a problem with its frequency table, take it
@@ -2755,11 +2760,12 @@ int cpufreq_boost_trigger_state(int state)

cpus_read_lock();
for_each_active_policy(policy) {
+ policy->boost_enabled = state;
ret = cpufreq_driver->set_boost(policy, state);
- if (ret)
+ if (ret) {
+ policy->boost_enabled = !policy->boost_enabled;
goto err_reset_state;
-
- policy->boost_enabled = state;
+ }
}
cpus_read_unlock();

diff --git a/drivers/cpufreq/freq_table.c b/drivers/cpufreq/freq_table.c
index c4d4643b6ca65..c17dc51a5a022 100644
--- a/drivers/cpufreq/freq_table.c
+++ b/drivers/cpufreq/freq_table.c
@@ -40,7 +40,7 @@ int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
cpufreq_for_each_valid_entry(pos, table) {
freq = pos->frequency;

- if (!cpufreq_boost_enabled()
+ if ((!cpufreq_boost_enabled() || !policy->boost_enabled)
&& (pos->flags & CPUFREQ_BOOST_FREQ))
continue;

--
2.43.0