Register for limit change notifications if supported and use the throttled
frequency from the notification to apply HW pressure.
Signed-off-by: Sibi Sankar <quic_sibis@xxxxxxxxxxx>
---
v5:
* Drop patch 1 and use pm_qos to update constraints. [Vincent]
* Use sdev instead of cpu_dev in dev_warn. [Christian]
* Pass sdev directly through private data. [Christian]
* Dropping Rb's for now.
drivers/cpufreq/scmi-cpufreq.c | 36 ++++++++++++++++++++++++++++++++++
1 file changed, 36 insertions(+)
diff --git a/drivers/cpufreq/scmi-cpufreq.c b/drivers/cpufreq/scmi-cpufreq.c
index b87fd127aa43..0edfa55d8e49 100644
--- a/drivers/cpufreq/scmi-cpufreq.c
+++ b/drivers/cpufreq/scmi-cpufreq.c
@@ -16,6 +16,7 @@
#include <linux/export.h>
#include <linux/module.h>
#include <linux/pm_opp.h>
+#include <linux/pm_qos.h>
#include <linux/slab.h>
#include <linux/scmi_protocol.h>
#include <linux/types.h>
@@ -25,7 +26,9 @@ struct scmi_data {
int domain_id;
int nr_opp;
struct device *cpu_dev;
+ struct cpufreq_policy *policy;
cpumask_var_t opp_shared_cpus;
+ struct notifier_block limit_notify_nb;
};
static struct scmi_protocol_handle *ph;
@@ -174,6 +177,25 @@ static struct freq_attr *scmi_cpufreq_hw_attr[] = {
NULL,
};
+static int scmi_limit_notify_cb(struct notifier_block *nb, unsigned long event, void *data)
+{
+ struct scmi_data *priv = container_of(nb, struct scmi_data, limit_notify_nb);
+ struct scmi_perf_limits_report *limit_notify = data;
+ struct cpufreq_policy *policy = priv->policy;
+ unsigned int limit_freq_khz;
+ int ret;
+
+ limit_freq_khz = limit_notify->range_max_freq / HZ_PER_KHZ;
+
+ policy->max = clamp(limit_freq_khz, policy->cpuinfo.min_freq, policy->cpuinfo.max_freq);
+
+ ret = freq_qos_update_request(policy->max_freq_req, policy->max);
+ if (ret < 0)
+ pr_warn("failed to update freq constraint: %d\n", ret);
+
+ return NOTIFY_OK;
+}
+
static int scmi_cpufreq_init(struct cpufreq_policy *policy)
{
int ret, nr_opp, domain;
@@ -181,6 +203,7 @@ static int scmi_cpufreq_init(struct cpufreq_policy *policy)
struct device *cpu_dev;
struct scmi_data *priv;
struct cpufreq_frequency_table *freq_table;
+ struct scmi_device *sdev = cpufreq_get_driver_data();
cpu_dev = get_cpu_device(policy->cpu);
if (!cpu_dev) {
@@ -294,6 +317,17 @@ static int scmi_cpufreq_init(struct cpufreq_policy *policy)
}
}
+ priv->limit_notify_nb.notifier_call = scmi_limit_notify_cb;
+ ret = sdev->handle->notify_ops->devm_event_notifier_register(sdev, SCMI_PROTOCOL_PERF,
+ SCMI_EVENT_PERFORMANCE_LIMITS_CHANGED,
+ &domain,
+ &priv->limit_notify_nb);
+ if (ret)
+ dev_warn(&sdev->dev,
+ "failed to register for limits change notifier for domain %d\n", domain);
+
+ priv->policy = policy;
+
return 0;
out_free_opp:
@@ -372,6 +406,8 @@ static int scmi_cpufreq_probe(struct scmi_device *sdev)
if (!handle)
return -ENODEV;
+ scmi_cpufreq_driver.driver_data = sdev;
+
perf_ops = handle->devm_protocol_get(sdev, SCMI_PROTOCOL_PERF, &ph);
if (IS_ERR(perf_ops))
return PTR_ERR(perf_ops);
--
2.34.1
