diff mbox series

[v7,2/3] scmi-cpufreq: Get opp_shared_cpus from opp-v2 for EM

Message ID 20210215075139.30772-3-nicola.mazzucato@arm.com (mailing list archive)
State New
Delegated to: viresh kumar
Headers show
Series CPUFreq: Add support for opp-sharing cpus | expand

Commit Message

Nicola Mazzucato Feb. 15, 2021, 7:51 a.m. UTC
By design, SCMI performance domains define the granularity of
performance controls, they do not describe any underlying hardware
dependencies (although they may match in many cases).

It is therefore possible to have some platforms where hardware may have
the ability to control CPU performance at different granularity and choose
to describe fine-grained performance control through SCMI.

In such situations, the energy model would be provided with inaccurate
information based on controls, while it still needs to know the
performance boundaries.

To restore correct functionality, retrieve information of CPUs under the
same performance domain from operating-points-v2 in DT, and pass it on to
EM.

Reviewed-by: Ionela Voinescu <ionela.voinescu@arm.com>
Tested-by: Ionela Voinescu <ionela.voinescu@arm.com>
Signed-off-by: Nicola Mazzucato <nicola.mazzucato@arm.com>
---
 drivers/cpufreq/scmi-cpufreq.c | 72 ++++++++++++++++++++++++----------
 1 file changed, 52 insertions(+), 20 deletions(-)

Comments

Viresh Kumar Feb. 18, 2021, 11 a.m. UTC | #1
On 15-02-21, 07:51, Nicola Mazzucato wrote:
> +	/*
> +	 * Add OPPs only on those CPUs for which we haven't already done so.
> +	 */
>  	nr_opp = dev_pm_opp_get_opp_count(cpu_dev);

Please add a more detailed comment here explaining why you expect OPPs
to be present here in advance. i.e. you _may_ have policy per CPU even
though OPP core says OPPs are shared.. It is not straight forward to
catch otherwise.

>  	if (nr_opp <= 0) {
> -		dev_err(cpu_dev, "%s: No OPPs for this device: %d\n",
> -			__func__, ret);
> -
> -		ret = -ENODEV;
> -		goto out_free_priv;
> +		ret = handle->perf_ops->device_opps_add(handle, cpu_dev);
> +		if (ret) {
> +			dev_warn(cpu_dev, "failed to add opps to the device\n");
> +			goto out_free_cpumask;
> +		}
> +
> +		nr_opp = dev_pm_opp_get_opp_count(cpu_dev);
> +		if (nr_opp <= 0) {
> +			dev_err(cpu_dev, "%s: No OPPs for this device: %d\n",
> +				__func__, ret);
> +
> +			ret = -ENODEV;
> +			goto out_free_opp;
> +		}
> +
> +		ret = dev_pm_opp_set_sharing_cpus(cpu_dev, opp_shared_cpus);
> +		if (ret) {
> +			dev_err(cpu_dev, "%s: failed to mark OPPs as shared: %d\n",
> +				__func__, ret);
> +
> +			goto out_free_opp;
> +		}
> +
> +		power_scale_mw = handle->perf_ops->power_scale_mw_get(handle);
> +		em_dev_register_perf_domain(cpu_dev, nr_opp, &em_cb,
> +					    opp_shared_cpus, power_scale_mw);
>  	}
Nicola Mazzucato Feb. 18, 2021, 1:02 p.m. UTC | #2
Hi Viresh,


On 2/18/21 11:00 AM, Viresh Kumar wrote:
> On 15-02-21, 07:51, Nicola Mazzucato wrote:
>> +	/*
>> +	 * Add OPPs only on those CPUs for which we haven't already done so.
>> +	 */
>>  	nr_opp = dev_pm_opp_get_opp_count(cpu_dev);
> 
> Please add a more detailed comment here explaining why you expect OPPs
> to be present here in advance. i.e. you _may_ have policy per CPU even
> though OPP core says OPPs are shared.. It is not straight forward to
> catch otherwise.

Sure, I'll put more details, thanks.

> 
>>  	if (nr_opp <= 0) {
>> -		dev_err(cpu_dev, "%s: No OPPs for this device: %d\n",
>> -			__func__, ret);
>> -
>> -		ret = -ENODEV;
>> -		goto out_free_priv;
>> +		ret = handle->perf_ops->device_opps_add(handle, cpu_dev);
>> +		if (ret) {
>> +			dev_warn(cpu_dev, "failed to add opps to the device\n");
>> +			goto out_free_cpumask;
>> +		}
>> +
>> +		nr_opp = dev_pm_opp_get_opp_count(cpu_dev);
>> +		if (nr_opp <= 0) {
>> +			dev_err(cpu_dev, "%s: No OPPs for this device: %d\n",
>> +				__func__, ret);
>> +
>> +			ret = -ENODEV;
>> +			goto out_free_opp;
>> +		}
>> +
>> +		ret = dev_pm_opp_set_sharing_cpus(cpu_dev, opp_shared_cpus);
>> +		if (ret) {
>> +			dev_err(cpu_dev, "%s: failed to mark OPPs as shared: %d\n",
>> +				__func__, ret);
>> +
>> +			goto out_free_opp;
>> +		}
>> +
>> +		power_scale_mw = handle->perf_ops->power_scale_mw_get(handle);
>> +		em_dev_register_perf_domain(cpu_dev, nr_opp, &em_cb,
>> +					    opp_shared_cpus, power_scale_mw);
>>  	}
>
diff mbox series

Patch

diff --git a/drivers/cpufreq/scmi-cpufreq.c b/drivers/cpufreq/scmi-cpufreq.c
index 34bf2eb8d465..fc9866511f01 100644
--- a/drivers/cpufreq/scmi-cpufreq.c
+++ b/drivers/cpufreq/scmi-cpufreq.c
@@ -126,6 +126,7 @@  static int scmi_cpufreq_init(struct cpufreq_policy *policy)
 	struct scmi_data *priv;
 	struct cpufreq_frequency_table *freq_table;
 	struct em_data_callback em_cb = EM_DATA_CB(scmi_get_cpu_power);
+	cpumask_var_t opp_shared_cpus;
 	bool power_scale_mw;
 
 	cpu_dev = get_cpu_device(policy->cpu);
@@ -134,32 +135,62 @@  static int scmi_cpufreq_init(struct cpufreq_policy *policy)
 		return -ENODEV;
 	}
 
-	ret = handle->perf_ops->device_opps_add(handle, cpu_dev);
-	if (ret) {
-		dev_warn(cpu_dev, "failed to add opps to the device\n");
-		return ret;
-	}
+	if (!zalloc_cpumask_var(&opp_shared_cpus, GFP_KERNEL))
+		ret = -ENOMEM;
 
+	/* Obtain CPUs that share SCMI performance controls */
 	ret = scmi_get_sharing_cpus(cpu_dev, policy->cpus);
 	if (ret) {
 		dev_warn(cpu_dev, "failed to get sharing cpumask\n");
-		return ret;
+		goto out_free_cpumask;
 	}
 
-	ret = dev_pm_opp_set_sharing_cpus(cpu_dev, policy->cpus);
-	if (ret) {
-		dev_err(cpu_dev, "%s: failed to mark OPPs as shared: %d\n",
-			__func__, ret);
-		return ret;
+	/*
+	 * Obtain CPUs that share performance levels.
+	 * The OPP 'sharing cpus' info may come from DT through an empty opp
+	 * table and opp-shared.
+	 */
+	ret = dev_pm_opp_of_get_sharing_cpus(cpu_dev, opp_shared_cpus);
+	if (ret || !cpumask_weight(opp_shared_cpus)) {
+		/*
+		 * Either opp-table is not set or no opp-shared was found.
+		 * Use the CPU mask from SCMI to designate CPUs sharing an OPP
+		 * table.
+		 */
+		cpumask_copy(opp_shared_cpus, policy->cpus);
 	}
 
+	/*
+	 * Add OPPs only on those CPUs for which we haven't already done so.
+	 */
 	nr_opp = dev_pm_opp_get_opp_count(cpu_dev);
 	if (nr_opp <= 0) {
-		dev_err(cpu_dev, "%s: No OPPs for this device: %d\n",
-			__func__, ret);
-
-		ret = -ENODEV;
-		goto out_free_priv;
+		ret = handle->perf_ops->device_opps_add(handle, cpu_dev);
+		if (ret) {
+			dev_warn(cpu_dev, "failed to add opps to the device\n");
+			goto out_free_cpumask;
+		}
+
+		nr_opp = dev_pm_opp_get_opp_count(cpu_dev);
+		if (nr_opp <= 0) {
+			dev_err(cpu_dev, "%s: No OPPs for this device: %d\n",
+				__func__, ret);
+
+			ret = -ENODEV;
+			goto out_free_opp;
+		}
+
+		ret = dev_pm_opp_set_sharing_cpus(cpu_dev, opp_shared_cpus);
+		if (ret) {
+			dev_err(cpu_dev, "%s: failed to mark OPPs as shared: %d\n",
+				__func__, ret);
+
+			goto out_free_opp;
+		}
+
+		power_scale_mw = handle->perf_ops->power_scale_mw_get(handle);
+		em_dev_register_perf_domain(cpu_dev, nr_opp, &em_cb,
+					    opp_shared_cpus, power_scale_mw);
 	}
 
 	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
@@ -192,17 +223,18 @@  static int scmi_cpufreq_init(struct cpufreq_policy *policy)
 	policy->fast_switch_possible =
 		handle->perf_ops->fast_switch_possible(handle, cpu_dev);
 
-	power_scale_mw = handle->perf_ops->power_scale_mw_get(handle);
-	em_dev_register_perf_domain(cpu_dev, nr_opp, &em_cb, policy->cpus,
-				    power_scale_mw);
-
+	free_cpumask_var(opp_shared_cpus);
 	return 0;
 
 out_free_priv:
 	kfree(priv);
+
 out_free_opp:
 	dev_pm_opp_remove_all_dynamic(cpu_dev);
 
+out_free_cpumask:
+	free_cpumask_var(opp_shared_cpus);
+
 	return ret;
 }