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From:   Ulf Hansson <ulf.hansson@linaro.org>
To:     Sudeep Holla <sudeep.holla@arm.com>,
        Cristian Marussi <cristian.marussi@arm.com>,
        Viresh Kumar <vireshk@kernel.org>, Nishanth Menon <nm@ti.com>,
        Stephen Boyd <sboyd@kernel.org>
Cc:     Nikunj Kela <nkela@quicinc.com>,
        Prasad Sodagudi <psodagud@quicinc.com>,
        Alexandre Torgue <alexandre.torgue@foss.st.com>,
        Ulf Hansson <ulf.hansson@linaro.org>, linux-pm@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: [PATCH 05/16] firmware: arm_scmi: Align perf ops to use domain-id as in-parameter
Date:   Wed,  7 Jun 2023 14:46:17 +0200
Message-Id: <20230607124628.157465-6-ulf.hansson@linaro.org>
In-Reply-To: <20230607124628.157465-1-ulf.hansson@linaro.org>
References: <20230607124628.157465-1-ulf.hansson@linaro.org>
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Most scmi_perf_proto_ops are already using an "u32 domain" as an
in-parameter to indicate what performance domain we shall operate upon.
However, some of the ops are using a "struct device *dev", which means an
an additional OF parsing is needed each time the perf ops gets called, to
find the corresponding domain-id.

To avoid a potential unnecessary OF parsing, but also to make the code more
consistent, let's replace the in-parameter "struct device *dev" with an
"u32 domain". Note that, this requires us to make some corresponding
changes to the scmi cpufreq driver, so let's do that too.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
---
 drivers/cpufreq/scmi-cpufreq.c   | 14 +++++++++-----
 drivers/firmware/arm_scmi/perf.c | 18 +++++-------------
 include/linux/scmi_protocol.h    |  6 +++---
 3 files changed, 17 insertions(+), 21 deletions(-)

diff --git a/drivers/cpufreq/scmi-cpufreq.c b/drivers/cpufreq/scmi-cpufreq.c
index 7d05d48c0337..125e8a8421fb 100644
--- a/drivers/cpufreq/scmi-cpufreq.c
+++ b/drivers/cpufreq/scmi-cpufreq.c
@@ -137,7 +137,7 @@ scmi_get_cpu_power(struct device *cpu_dev, unsigned long *power,
 
 static int scmi_cpufreq_init(struct cpufreq_policy *policy)
 {
-	int ret, nr_opp;
+	int ret, nr_opp, domain;
 	unsigned int latency;
 	struct device *cpu_dev;
 	struct scmi_data *priv;
@@ -149,6 +149,10 @@ static int scmi_cpufreq_init(struct cpufreq_policy *policy)
 		return -ENODEV;
 	}
 
+	domain = scmi_cpu_domain_id(cpu_dev);
+	if (domain < 0)
+		return domain;
+
 	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 	if (!priv)
 		return -ENOMEM;
@@ -187,7 +191,7 @@ static int scmi_cpufreq_init(struct cpufreq_policy *policy)
 	  */
 	nr_opp = dev_pm_opp_get_opp_count(cpu_dev);
 	if (nr_opp <= 0) {
-		ret = perf_ops->device_opps_add(ph, cpu_dev);
+		ret = perf_ops->device_opps_add(ph, cpu_dev, domain);
 		if (ret) {
 			dev_warn(cpu_dev, "failed to add opps to the device\n");
 			goto out_free_cpumask;
@@ -220,7 +224,7 @@ static int scmi_cpufreq_init(struct cpufreq_policy *policy)
 	}
 
 	priv->cpu_dev = cpu_dev;
-	priv->domain_id = scmi_cpu_domain_id(cpu_dev);
+	priv->domain_id = domain;
 
 	policy->driver_data = priv;
 	policy->freq_table = freq_table;
@@ -228,14 +232,14 @@ static int scmi_cpufreq_init(struct cpufreq_policy *policy)
 	/* SCMI allows DVFS request for any domain from any CPU */
 	policy->dvfs_possible_from_any_cpu = true;
 
-	latency = perf_ops->transition_latency_get(ph, cpu_dev);
+	latency = perf_ops->transition_latency_get(ph, domain);
 	if (!latency)
 		latency = CPUFREQ_ETERNAL;
 
 	policy->cpuinfo.transition_latency = latency;
 
 	policy->fast_switch_possible =
-		perf_ops->fast_switch_possible(ph, cpu_dev);
+		perf_ops->fast_switch_possible(ph, domain);
 
 	return 0;
 
diff --git a/drivers/firmware/arm_scmi/perf.c b/drivers/firmware/arm_scmi/perf.c
index 216bcd68d549..563fa44b1a71 100644
--- a/drivers/firmware/arm_scmi/perf.c
+++ b/drivers/firmware/arm_scmi/perf.c
@@ -593,18 +593,14 @@ static int scmi_dev_domain_id(struct device *dev)
 }
 
 static int scmi_dvfs_device_opps_add(const struct scmi_protocol_handle *ph,
-				     struct device *dev)
+				     struct device *dev, u32 domain)
 {
-	int idx, ret, domain;
+	int idx, ret;
 	unsigned long freq;
 	struct scmi_opp *opp;
 	struct perf_dom_info *dom;
 	struct scmi_perf_info *pi = ph->get_priv(ph);
 
-	domain = scmi_dev_domain_id(dev);
-	if (domain < 0)
-		return domain;
-
 	dom = pi->dom_info + domain;
 
 	for (opp = dom->opp, idx = 0; idx < dom->opp_count; idx++, opp++) {
@@ -626,14 +622,10 @@ static int scmi_dvfs_device_opps_add(const struct scmi_protocol_handle *ph,
 
 static int
 scmi_dvfs_transition_latency_get(const struct scmi_protocol_handle *ph,
-				 struct device *dev)
+				 u32 domain)
 {
 	struct perf_dom_info *dom;
 	struct scmi_perf_info *pi = ph->get_priv(ph);
-	int domain = scmi_dev_domain_id(dev);
-
-	if (domain < 0)
-		return domain;
 
 	dom = pi->dom_info + domain;
 	/* uS to nS */
@@ -693,12 +685,12 @@ static int scmi_dvfs_est_power_get(const struct scmi_protocol_handle *ph,
 }
 
 static bool scmi_fast_switch_possible(const struct scmi_protocol_handle *ph,
-				      struct device *dev)
+				      u32 domain)
 {
 	struct perf_dom_info *dom;
 	struct scmi_perf_info *pi = ph->get_priv(ph);
 
-	dom = pi->dom_info + scmi_dev_domain_id(dev);
+	dom = pi->dom_info + domain;
 
 	return dom->fc_info && dom->fc_info[PERF_FC_LEVEL].set_addr;
 }
diff --git a/include/linux/scmi_protocol.h b/include/linux/scmi_protocol.h
index 99c3e985c40f..34ecaeeb51bc 100644
--- a/include/linux/scmi_protocol.h
+++ b/include/linux/scmi_protocol.h
@@ -136,9 +136,9 @@ struct scmi_perf_proto_ops {
 			 u32 *level, bool poll);
 	int (*device_domain_id)(struct device *dev);
 	int (*transition_latency_get)(const struct scmi_protocol_handle *ph,
-				      struct device *dev);
+				      u32 domain);
 	int (*device_opps_add)(const struct scmi_protocol_handle *ph,
-			       struct device *dev);
+			       struct device *dev, u32 domain);
 	int (*freq_set)(const struct scmi_protocol_handle *ph, u32 domain,
 			unsigned long rate, bool poll);
 	int (*freq_get)(const struct scmi_protocol_handle *ph, u32 domain,
@@ -146,7 +146,7 @@ struct scmi_perf_proto_ops {
 	int (*est_power_get)(const struct scmi_protocol_handle *ph, u32 domain,
 			     unsigned long *rate, unsigned long *power);
 	bool (*fast_switch_possible)(const struct scmi_protocol_handle *ph,
-				     struct device *dev);
+				     u32 domain);
 	enum scmi_power_scale (*power_scale_get)(const struct scmi_protocol_handle *ph);
 };
 
-- 
2.34.1