[PATCH V3 0/9] Add callback to register with energy model

[PATCH V3 0/9] Add callback to register with energy model

[Viresh Kumar]

Many cpufreq drivers register with the energy model for each policy and
do exactly the same thing. Follow the footsteps of thermal-cooling, to
get it done from the cpufreq core itself.

Provide a new callback, which will be called, if present, by the cpufreq
core at the right moment (more on that in the code's comment). Also
provide a generic implementation that uses dev_pm_opp_of_register_em().

This also allows us to register with the EM at a later point of time,
compared to ->init(), from where the EM core can access cpufreq policy
directly using cpufreq_cpu_get() type of helpers and perform other work,
like marking few frequencies inefficient, this will be done separately.

This is build/boot tested by the bot for a couple of boards.

https://gitlab.com/vireshk/pmko/-/pipelines/351965580

FWIW, I have queued up the series for linux-next to get more testing, but your
reviews are welcome. Thanks.

V2->V3:
- Drop the auto-register part from all logs, this isn't called auto registration
  anymore.
- Call register_em() only for new policies.
- Update scmi driver to register with EM only when required.
- Add Rby tags.

V1->V2:
- Add a callback instead of flag.
- Register before governor is initialized.
- Update scmi driver as well.
- Don't unregister from the EM core.

--
Viresh

Viresh Kumar (9):
  cpufreq: Add callback to register with energy model
  cpufreq: dt: Use .register_em() to register with energy model
  cpufreq: imx6q: Use .register_em() to register with energy model
  cpufreq: mediatek: Use .register_em() to register with energy model
  cpufreq: omap: Use .register_em() to register with energy model
  cpufreq: qcom-cpufreq-hw: Use .register_em() to register with energy
    model
  cpufreq: scpi: Use .register_em() to register with energy model
  cpufreq: vexpress: Use .register_em() to register with energy model
  cpufreq: scmi: Use .register_em() to register with energy model

 drivers/cpufreq/cpufreq-dt.c           |  3 +-
 drivers/cpufreq/cpufreq.c              | 13 ++++++
 drivers/cpufreq/imx6q-cpufreq.c        |  2 +-
 drivers/cpufreq/mediatek-cpufreq.c     |  3 +-
 drivers/cpufreq/omap-cpufreq.c         |  2 +-
 drivers/cpufreq/qcom-cpufreq-hw.c      |  3 +-
 drivers/cpufreq/scmi-cpufreq.c         | 65 +++++++++++++++++---------
 drivers/cpufreq/scpi-cpufreq.c         |  3 +-
 drivers/cpufreq/vexpress-spc-cpufreq.c |  3 +-
 include/linux/cpufreq.h                | 14 ++++++
 10 files changed, 76 insertions(+), 35 deletions(-)

-- 
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[PATCH V3 3/9] cpufreq: imx6q: Use .register_em() to register with energy model

[Viresh Kumar]

Set the newly added .register_em() callback with
cpufreq_register_em_with_opp() to register with the EM core.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
---
 drivers/cpufreq/imx6q-cpufreq.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/cpufreq/imx6q-cpufreq.c b/drivers/cpufreq/imx6q-cpufreq.c
index 5bf5fc759881..90beb26ed34e 100644
--- a/drivers/cpufreq/imx6q-cpufreq.c
+++ b/drivers/cpufreq/imx6q-cpufreq.c
@@ -192,7 +192,6 @@ static int imx6q_cpufreq_init(struct cpufreq_policy *policy)
 	policy->clk = clks[ARM].clk;
 	cpufreq_generic_init(policy, freq_table, transition_latency);
 	policy->suspend_freq = max_freq;
-	dev_pm_opp_of_register_em(cpu_dev, policy->cpus);
 
 	return 0;
 }
@@ -204,6 +203,7 @@ static struct cpufreq_driver imx6q_cpufreq_driver = {
 	.target_index = imx6q_set_target,
 	.get = cpufreq_generic_get,
 	.init = imx6q_cpufreq_init,
+	.register_em = cpufreq_register_em_with_opp,
 	.name = "imx6q-cpufreq",
 	.attr = cpufreq_generic_attr,
 	.suspend = cpufreq_generic_suspend,
-- 
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[PATCH V3 4/9] cpufreq: mediatek: Use .register_em() to register with energy model

[Viresh Kumar]

Set the newly added .register_em() callback with
cpufreq_register_em_with_opp() to register with the EM core.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
---
 drivers/cpufreq/mediatek-cpufreq.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/cpufreq/mediatek-cpufreq.c b/drivers/cpufreq/mediatek-cpufreq.c
index 87019d5a9547..866163883b48 100644
--- a/drivers/cpufreq/mediatek-cpufreq.c
+++ b/drivers/cpufreq/mediatek-cpufreq.c
@@ -448,8 +448,6 @@ static int mtk_cpufreq_init(struct cpufreq_policy *policy)
 	policy->driver_data = info;
 	policy->clk = info->cpu_clk;
 
-	dev_pm_opp_of_register_em(info->cpu_dev, policy->cpus);
-
 	return 0;
 }
 
@@ -471,6 +469,7 @@ static struct cpufreq_driver mtk_cpufreq_driver = {
 	.get = cpufreq_generic_get,
 	.init = mtk_cpufreq_init,
 	.exit = mtk_cpufreq_exit,
+	.register_em = cpufreq_register_em_with_opp,
 	.name = "mtk-cpufreq",
 	.attr = cpufreq_generic_attr,
 };
-- 
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[PATCH V3 7/9] cpufreq: scpi: Use .register_em() to register with energy model

[Viresh Kumar]

Set the newly added .register_em() callback with
cpufreq_register_em_with_opp() to register with the EM core.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
---
 drivers/cpufreq/scpi-cpufreq.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/cpufreq/scpi-cpufreq.c b/drivers/cpufreq/scpi-cpufreq.c
index d6a698a1b5d1..bda3e7d42964 100644
--- a/drivers/cpufreq/scpi-cpufreq.c
+++ b/drivers/cpufreq/scpi-cpufreq.c
@@ -163,8 +163,6 @@ static int scpi_cpufreq_init(struct cpufreq_policy *policy)
 
 	policy->fast_switch_possible = false;
 
-	dev_pm_opp_of_register_em(cpu_dev, policy->cpus);
-
 	return 0;
 
 out_free_cpufreq_table:
@@ -200,6 +198,7 @@ static struct cpufreq_driver scpi_cpufreq_driver = {
 	.init	= scpi_cpufreq_init,
 	.exit	= scpi_cpufreq_exit,
 	.target_index	= scpi_cpufreq_set_target,
+	.register_em	= cpufreq_register_em_with_opp,
 };
 
 static int scpi_cpufreq_probe(struct platform_device *pdev)
-- 
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[PATCH V3 8/9] cpufreq: vexpress: Use .register_em() to register with energy model

[Viresh Kumar]

Set the newly added .register_em() callback with
cpufreq_register_em_with_opp() to register with the EM core.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
---
 drivers/cpufreq/vexpress-spc-cpufreq.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/cpufreq/vexpress-spc-cpufreq.c b/drivers/cpufreq/vexpress-spc-cpufreq.c
index ab56813b7256..284b6bd040b1 100644
--- a/drivers/cpufreq/vexpress-spc-cpufreq.c
+++ b/drivers/cpufreq/vexpress-spc-cpufreq.c
@@ -440,8 +440,6 @@ static int ve_spc_cpufreq_init(struct cpufreq_policy *policy)
 	policy->freq_table = freq_table[cur_cluster];
 	policy->cpuinfo.transition_latency = 1000000; /* 1 ms */
 
-	dev_pm_opp_of_register_em(cpu_dev, policy->cpus);
-
 	if (is_bL_switching_enabled())
 		per_cpu(cpu_last_req_freq, policy->cpu) =
 						clk_get_cpu_rate(policy->cpu);
@@ -475,6 +473,7 @@ static struct cpufreq_driver ve_spc_cpufreq_driver = {
 	.get			= ve_spc_cpufreq_get_rate,
 	.init			= ve_spc_cpufreq_init,
 	.exit			= ve_spc_cpufreq_exit,
+	.register_em		= cpufreq_register_em_with_opp,
 	.attr			= cpufreq_generic_attr,
 };
 
-- 
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[PATCH V3 9/9] cpufreq: scmi: Use .register_em() to register with energy model

[Viresh Kumar]

Set the newly added .register_em() callback to register with the EM
after the cpufreq policy is properly initialized.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
---
 drivers/cpufreq/scmi-cpufreq.c | 65 ++++++++++++++++++++++------------
 1 file changed, 42 insertions(+), 23 deletions(-)

diff --git a/drivers/cpufreq/scmi-cpufreq.c b/drivers/cpufreq/scmi-cpufreq.c
index 75f818d04b48..1e0cd4d165f0 100644
--- a/drivers/cpufreq/scmi-cpufreq.c
+++ b/drivers/cpufreq/scmi-cpufreq.c
@@ -22,7 +22,9 @@
 
 struct scmi_data {
 	int domain_id;
+	int nr_opp;
 	struct device *cpu_dev;
+	cpumask_var_t opp_shared_cpus;
 };
 
 static struct scmi_protocol_handle *ph;
@@ -123,9 +125,6 @@ static int scmi_cpufreq_init(struct cpufreq_policy *policy)
 	struct device *cpu_dev;
 	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);
 	if (!cpu_dev) {
@@ -133,9 +132,15 @@ static int scmi_cpufreq_init(struct cpufreq_policy *policy)
 		return -ENODEV;
 	}
 
-	if (!zalloc_cpumask_var(&opp_shared_cpus, GFP_KERNEL))
+	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+	if (!priv)
 		return -ENOMEM;
 
+	if (!zalloc_cpumask_var(&priv->opp_shared_cpus, GFP_KERNEL)) {
+		ret = -ENOMEM;
+		goto out_free_priv;
+	}
+
 	/* Obtain CPUs that share SCMI performance controls */
 	ret = scmi_get_sharing_cpus(cpu_dev, policy->cpus);
 	if (ret) {
@@ -148,14 +153,14 @@ static int scmi_cpufreq_init(struct cpufreq_policy *policy)
 	 * 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)) {
+	ret = dev_pm_opp_of_get_sharing_cpus(cpu_dev, priv->opp_shared_cpus);
+	if (ret || !cpumask_weight(priv->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);
+		cpumask_copy(priv->opp_shared_cpus, policy->cpus);
 	}
 
 	 /*
@@ -180,7 +185,7 @@ static int scmi_cpufreq_init(struct cpufreq_policy *policy)
 			goto out_free_opp;
 		}
 
-		ret = dev_pm_opp_set_sharing_cpus(cpu_dev, opp_shared_cpus);
+		ret = dev_pm_opp_set_sharing_cpus(cpu_dev, priv->opp_shared_cpus);
 		if (ret) {
 			dev_err(cpu_dev, "%s: failed to mark OPPs as shared: %d\n",
 				__func__, ret);
@@ -188,21 +193,13 @@ static int scmi_cpufreq_init(struct cpufreq_policy *policy)
 			goto out_free_opp;
 		}
 
-		power_scale_mw = perf_ops->power_scale_mw_get(ph);
-		em_dev_register_perf_domain(cpu_dev, nr_opp, &em_cb,
-					    opp_shared_cpus, power_scale_mw);
-	}
-
-	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
-	if (!priv) {
-		ret = -ENOMEM;
-		goto out_free_opp;
+		priv->nr_opp = nr_opp;
 	}
 
 	ret = dev_pm_opp_init_cpufreq_table(cpu_dev, &freq_table);
 	if (ret) {
 		dev_err(cpu_dev, "failed to init cpufreq table: %d\n", ret);
-		goto out_free_priv;
+		goto out_free_opp;
 	}
 
 	priv->cpu_dev = cpu_dev;
@@ -223,17 +220,16 @@ static int scmi_cpufreq_init(struct cpufreq_policy *policy)
 	policy->fast_switch_possible =
 		perf_ops->fast_switch_possible(ph, cpu_dev);
 
-	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);
+	free_cpumask_var(priv->opp_shared_cpus);
+
+out_free_priv:
+	kfree(priv);
 
 	return ret;
 }
@@ -244,11 +240,33 @@ static int scmi_cpufreq_exit(struct cpufreq_policy *policy)
 
 	dev_pm_opp_free_cpufreq_table(priv->cpu_dev, &policy->freq_table);
 	dev_pm_opp_remove_all_dynamic(priv->cpu_dev);
+	free_cpumask_var(priv->opp_shared_cpus);
 	kfree(priv);
 
 	return 0;
 }
 
+static void scmi_cpufreq_register_em(struct cpufreq_policy *policy)
+{
+	struct em_data_callback em_cb = EM_DATA_CB(scmi_get_cpu_power);
+	bool power_scale_mw = perf_ops->power_scale_mw_get(ph);
+	struct scmi_data *priv = policy->driver_data;
+
+	/*
+	 * This callback will be called for each policy, but we don't need to
+	 * register with EM every time. Despite not being part of the same
+	 * policy, some CPUs may still share their perf-domains, and a CPU from
+	 * another policy may already have registered with EM on behalf of CPUs
+	 * of this policy.
+	 */
+	if (!priv->nr_opp)
+		return;
+
+	em_dev_register_perf_domain(get_cpu_device(policy->cpu), priv->nr_opp,
+				    &em_cb, priv->opp_shared_cpus,
+				    power_scale_mw);
+}
+
 static struct cpufreq_driver scmi_cpufreq_driver = {
 	.name	= "scmi",
 	.flags	= CPUFREQ_HAVE_GOVERNOR_PER_POLICY |
@@ -261,6 +279,7 @@ static struct cpufreq_driver scmi_cpufreq_driver = {
 	.get	= scmi_cpufreq_get_rate,
 	.init	= scmi_cpufreq_init,
 	.exit	= scmi_cpufreq_exit,
+	.register_em	= scmi_cpufreq_register_em,
 };
 
 static int scmi_cpufreq_probe(struct scmi_device *sdev)
-- 
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Re: [PATCH V3 7/9] cpufreq: scpi: Use .register_em() to register with energy model

[Sudeep Holla]

On Thu, Aug 12, 2021 at 10:05:20AM +0530, Viresh Kumar wrote:
> Set the newly added .register_em() callback with
> cpufreq_register_em_with_opp() to register with the EM core.
> 

If not too late,

Acked-by: Sudeep Holla <sudeep.holla@arm.com>

-- 
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Re: [PATCH V3 9/9] cpufreq: scmi: Use .register_em() to register with energy model

[Sudeep Holla]

On Thu, Aug 12, 2021 at 10:05:22AM +0530, Viresh Kumar wrote:
> Set the newly added .register_em() callback to register with the EM
> after the cpufreq policy is properly initialized.
> 

Acked-by: Sudeep Holla <sudeep.holla@arm.com>

-- 
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Re: [PATCH V3 8/9] cpufreq: vexpress: Use .register_em() to register with energy model

[Sudeep Holla]

On Thu, Aug 12, 2021 at 10:05:21AM +0530, Viresh Kumar wrote:
> Set the newly added .register_em() callback with
> cpufreq_register_em_with_opp() to register with the EM core.
>

Acked-by: Sudeep Holla <sudeep.holla@arm.com>

-- 
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Sudeep

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Re: [PATCH V3 0/9] Add callback to register with energy model

[Dietmar Eggemann]

On 12/08/2021 06:35, Viresh Kumar wrote:
> Many cpufreq drivers register with the energy model for each policy and
> do exactly the same thing. Follow the footsteps of thermal-cooling, to
> get it done from the cpufreq core itself.
> 
> Provide a new callback, which will be called, if present, by the cpufreq
> core at the right moment (more on that in the code's comment). Also
> provide a generic implementation that uses dev_pm_opp_of_register_em().
> 
> This also allows us to register with the EM at a later point of time,
> compared to ->init(), from where the EM core can access cpufreq policy
> directly using cpufreq_cpu_get() type of helpers and perform other work,
> like marking few frequencies inefficient, this will be done separately.
> 
> This is build/boot tested by the bot for a couple of boards.
> 
> https://gitlab.com/vireshk/pmko/-/pipelines/351965580
> 
> FWIW, I have queued up the series for linux-next to get more testing, but your
> reviews are welcome. Thanks.
> 
> V2->V3:
> - Drop the auto-register part from all logs, this isn't called auto registration
>   anymore.
> - Call register_em() only for new policies.
> - Update scmi driver to register with EM only when required.
> - Add Rby tags.

LGTM. Tested on TC2 (vexpress-spc), Juno-r0 (scpi-cpufreq and scmi).

Reviewed-by: Dietmar Eggemann <dietmar.eggemann@arm.com>



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Re: [PATCH V3 9/9] cpufreq: scmi: Use .register_em() to register with energy model

[Lukasz Luba]

Hi Viresh,

My apologies for delay I was on holidays. I've seen the pull requests,
so it's too late, but just for history...

I have tested this new callback with hacked juno FW which works in
the per-cpu perf requests. There are no issues.

Some debug prints:

[    3.110072] cpu cpu0: cpumask weight(opp_shared_cpus)=4 weight 
policy->cpus=1
[    3.117666] cpu cpu0: Empty OPP table
[    3.121418] cpu cpu0: OPP table empty
[    3.131367] cpu cpu0: EM: created perf domain
[    3.137848] cpu cpu1: cpumask weight(opp_shared_cpus)=2 weight 
policy->cpus=1
[    3.145220] cpu cpu1: Empty OPP table
[    3.148961] cpu cpu1: OPP table empty
[    3.158193] cpu cpu1: EM: created perf domain
[    3.164325] cpu cpu2: cpumask weight(opp_shared_cpus)=2 weight 
policy->cpus=1
[    3.173430] cpu cpu3: cpumask weight(opp_shared_cpus)=4 weight 
policy->cpus=1
[    3.181947] cpu cpu4: cpumask weight(opp_shared_cpus)=4 weight 
policy->cpus=1
[    3.190620] cpu cpu5: cpumask weight(opp_shared_cpus)=4 weight 
policy->cpus=1

root@sqwt-ubuntu:~# grep . /sys/kernel/debug/energy_model/cpu0/ps\:*/*
/sys/kernel/debug/energy_model/cpu0/ps:450000/cost:79
/sys/kernel/debug/energy_model/cpu0/ps:450000/frequency:450000
/sys/kernel/debug/energy_model/cpu0/ps:450000/power:42
/sys/kernel/debug/energy_model/cpu0/ps:575000/cost:85
/sys/kernel/debug/energy_model/cpu0/ps:575000/frequency:575000
/sys/kernel/debug/energy_model/cpu0/ps:575000/power:58
/sys/kernel/debug/energy_model/cpu0/ps:700000/cost:95
/sys/kernel/debug/energy_model/cpu0/ps:700000/frequency:700000
/sys/kernel/debug/energy_model/cpu0/ps:700000/power:79
/sys/kernel/debug/energy_model/cpu0/ps:775000/cost:106
/sys/kernel/debug/energy_model/cpu0/ps:775000/frequency:775000
/sys/kernel/debug/energy_model/cpu0/ps:775000/power:97
/sys/kernel/debug/energy_model/cpu0/ps:850000/cost:119
/sys/kernel/debug/energy_model/cpu0/ps:850000/frequency:850000
/sys/kernel/debug/energy_model/cpu0/ps:850000/power:119
root@sqwt-ubuntu:~# cat /sys/kernel/debug/energy_model/cpu0/cpus
0,3-5
root@sqwt-ubuntu:~# cat /sys/kernel/debug/energy_model/cpu1/cpus
1-2
root@sqwt-ubuntu:~# grep . /sys/kernel/debug/energy_model/cpu1/ps\:*/*
/sys/kernel/debug/energy_model/cpu1/ps:1100000/cost:583
/sys/kernel/debug/energy_model/cpu1/ps:1100000/frequency:1100000
/sys/kernel/debug/energy_model/cpu1/ps:1100000/power:583
/sys/kernel/debug/energy_model/cpu1/ps:450000/cost:391
/sys/kernel/debug/energy_model/cpu1/ps:450000/frequency:450000
/sys/kernel/debug/energy_model/cpu1/ps:450000/power:160
/sys/kernel/debug/energy_model/cpu1/ps:625000/cost:420
/sys/kernel/debug/energy_model/cpu1/ps:625000/frequency:625000
/sys/kernel/debug/energy_model/cpu1/ps:625000/power:239
/sys/kernel/debug/energy_model/cpu1/ps:800000/cost:471
/sys/kernel/debug/energy_model/cpu1/ps:800000/frequency:800000
/sys/kernel/debug/energy_model/cpu1/ps:800000/power:343
/sys/kernel/debug/energy_model/cpu1/ps:950000/cost:525
/sys/kernel/debug/energy_model/cpu1/ps:950000/frequency:950000
/sys/kernel/debug/energy_model/cpu1/ps:950000/power:454
root@sqwt-ubuntu:~#

Regards,
Lukasz

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