linux/debian/patches/patchset-pf/amd-pstate/0027-amd-pstate-6.11-update-setting-the-minimum-frequency.patch

From 649d296be0c7f0df6e71b4fca25fdbe75cb3994e Mon Sep 17 00:00:00 2001
From: Oleksandr Natalenko <oleksandr@natalenko.name>
Date: Thu, 17 Oct 2024 17:03:11 +0200
Subject: amd-pstate-6.11: update setting the minimum frequency to
 lowest_nonlinear_freq patchset to v3

Signed-off-by: Oleksandr Natalenko <oleksandr@natalenko.name>
---
 drivers/cpufreq/amd-pstate.c | 67 +++++++++++++++++++++---------------
 drivers/cpufreq/amd-pstate.h |  4 +--
 drivers/cpufreq/cpufreq.c    |  6 +---
 include/linux/cpufreq.h      |  6 ----
 4 files changed, 43 insertions(+), 40 deletions(-)

--- a/drivers/cpufreq/amd-pstate.c
+++ b/drivers/cpufreq/amd-pstate.c
@@ -557,9 +557,28 @@ cpufreq_policy_put:
 	cpufreq_cpu_put(policy);
 }
 
-static int amd_pstate_verify(struct cpufreq_policy_data *policy)
+static int amd_pstate_verify(struct cpufreq_policy_data *policy_data)
 {
-	cpufreq_verify_within_cpu_limits(policy);
+	/*
+	 * Initialize lower frequency limit (i.e.policy->min) with
+	 * lowest_nonlinear_frequency which is the most energy efficient
+	 * frequency. Override the initial value set by cpufreq core and
+	 * amd-pstate qos_requests.
+	 */
+	if (policy_data->min == FREQ_QOS_MIN_DEFAULT_VALUE) {
+		struct cpufreq_policy *policy = cpufreq_cpu_get(policy_data->cpu);
+		struct amd_cpudata *cpudata;
+
+		if (!policy)
+			return -EINVAL;
+
+		cpudata = policy->driver_data;
+		policy_data->min = cpudata->lowest_nonlinear_freq;
+		cpufreq_cpu_put(policy);
+	}
+
+	cpufreq_verify_within_cpu_limits(policy_data);
+	pr_debug("policy_max =%d, policy_min=%d\n", policy_data->max, policy_data->min);
 
 	return 0;
 }
@@ -709,7 +728,7 @@ static int amd_pstate_cpu_boost_update(s
 	policy->max = policy->cpuinfo.max_freq;
 
 	if (cppc_state == AMD_PSTATE_PASSIVE) {
-		ret = freq_qos_update_request(&cpudata->max_freq_req, policy->cpuinfo.max_freq);
+		ret = freq_qos_update_request(&cpudata->req[1], policy->cpuinfo.max_freq);
 		if (ret < 0)
 			pr_debug("Failed to update freq constraint: CPU%d\n", cpudata->cpu);
 	}
@@ -976,17 +995,17 @@ static int amd_pstate_cpu_init(struct cp
 
 	ret = amd_pstate_init_perf(cpudata);
 	if (ret)
-		goto free_cpudata;
+		goto free_cpudata1;
 
 	amd_pstate_init_prefcore(cpudata);
 
 	ret = amd_pstate_init_freq(cpudata);
 	if (ret)
-		goto free_cpudata;
+		goto free_cpudata1;
 
 	ret = amd_pstate_init_boost_support(cpudata);
 	if (ret)
-		goto free_cpudata;
+		goto free_cpudata1;
 
 	min_freq = READ_ONCE(cpudata->min_freq);
 	max_freq = READ_ONCE(cpudata->max_freq);
@@ -1008,11 +1027,18 @@ static int amd_pstate_cpu_init(struct cp
 	if (cpu_feature_enabled(X86_FEATURE_CPPC))
 		policy->fast_switch_possible = true;
 
-	ret = freq_qos_add_request(&policy->constraints, &cpudata->max_freq_req,
+	ret = freq_qos_add_request(&policy->constraints, &cpudata->req[0],
+				   FREQ_QOS_MIN, FREQ_QOS_MIN_DEFAULT_VALUE);
+	if (ret < 0) {
+		dev_err(dev, "Failed to add min-freq constraint (%d)\n", ret);
+		goto free_cpudata1;
+	}
+
+	ret = freq_qos_add_request(&policy->constraints, &cpudata->req[1],
 				   FREQ_QOS_MAX, policy->cpuinfo.max_freq);
 	if (ret < 0) {
 		dev_err(dev, "Failed to add max-freq constraint (%d)\n", ret);
-		goto free_cpudata;
+		goto free_cpudata2;
 	}
 
 	cpudata->max_limit_freq = max_freq;
@@ -1025,7 +1051,9 @@ static int amd_pstate_cpu_init(struct cp
 
 	return 0;
 
-free_cpudata:
+free_cpudata2:
+	freq_qos_remove_request(&cpudata->req[0]);
+free_cpudata1:
 	kfree(cpudata);
 	return ret;
 }
@@ -1034,7 +1062,8 @@ static void amd_pstate_cpu_exit(struct c
 {
 	struct amd_cpudata *cpudata = policy->driver_data;
 
-	freq_qos_remove_request(&cpudata->max_freq_req);
+	freq_qos_remove_request(&cpudata->req[1]);
+	freq_qos_remove_request(&cpudata->req[0]);
 	policy->fast_switch_possible = false;
 	kfree(cpudata);
 }
@@ -1658,13 +1687,6 @@ static int amd_pstate_epp_cpu_offline(st
 	return 0;
 }
 
-static int amd_pstate_epp_verify_policy(struct cpufreq_policy_data *policy)
-{
-	cpufreq_verify_within_cpu_limits(policy);
-	pr_debug("policy_max =%d, policy_min=%d\n", policy->max, policy->min);
-	return 0;
-}
-
 static int amd_pstate_epp_suspend(struct cpufreq_policy *policy)
 {
 	struct amd_cpudata *cpudata = policy->driver_data;
@@ -1703,13 +1725,6 @@ static int amd_pstate_epp_resume(struct
 	return 0;
 }
 
-static int amd_pstate_get_init_min_freq(struct cpufreq_policy *policy)
-{
-	struct amd_cpudata *cpudata = policy->driver_data;
-
-	return READ_ONCE(cpudata->lowest_nonlinear_freq);
-}
-
 static struct cpufreq_driver amd_pstate_driver = {
 	.flags		= CPUFREQ_CONST_LOOPS | CPUFREQ_NEED_UPDATE_LIMITS,
 	.verify		= amd_pstate_verify,
@@ -1723,12 +1738,11 @@ static struct cpufreq_driver amd_pstate_
 	.update_limits	= amd_pstate_update_limits,
 	.name		= "amd-pstate",
 	.attr		= amd_pstate_attr,
-	.get_init_min_freq = amd_pstate_get_init_min_freq,
 };
 
 static struct cpufreq_driver amd_pstate_epp_driver = {
 	.flags		= CPUFREQ_CONST_LOOPS,
-	.verify		= amd_pstate_epp_verify_policy,
+	.verify		= amd_pstate_verify,
 	.setpolicy	= amd_pstate_epp_set_policy,
 	.init		= amd_pstate_epp_cpu_init,
 	.exit		= amd_pstate_epp_cpu_exit,
@@ -1740,7 +1754,6 @@ static struct cpufreq_driver amd_pstate_
 	.set_boost	= amd_pstate_set_boost,
 	.name		= "amd-pstate-epp",
 	.attr		= amd_pstate_epp_attr,
-	.get_init_min_freq = amd_pstate_get_init_min_freq,
 };
 
 static int __init amd_pstate_set_driver(int mode_idx)
--- a/drivers/cpufreq/amd-pstate.h
+++ b/drivers/cpufreq/amd-pstate.h
@@ -28,7 +28,7 @@ struct amd_aperf_mperf {
 /**
  * struct amd_cpudata - private CPU data for AMD P-State
  * @cpu: CPU number
- * @max_freq_req: maximum frequency constraint request to apply
+ * @req: constraint request to apply
  * @cppc_req_cached: cached performance request hints
  * @highest_perf: the maximum performance an individual processor may reach,
  *		  assuming ideal conditions
@@ -68,7 +68,7 @@ struct amd_aperf_mperf {
 struct amd_cpudata {
 	int	cpu;
 
-	struct	freq_qos_request max_freq_req;
+	struct	freq_qos_request req[2];
 	u64	cppc_req_cached;
 
 	u32	highest_perf;
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -1380,7 +1380,6 @@ static int cpufreq_online(unsigned int c
 	bool new_policy;
 	unsigned long flags;
 	unsigned int j;
-	u32 init_min_freq = FREQ_QOS_MIN_DEFAULT_VALUE;
 	int ret;
 
 	pr_debug("%s: bringing CPU%u online\n", __func__, cpu);
@@ -1465,12 +1464,9 @@ static int cpufreq_online(unsigned int c
 			goto out_destroy_policy;
 		}
 
-		if (cpufreq_driver->get_init_min_freq)
-			init_min_freq = cpufreq_driver->get_init_min_freq(policy);
-
 		ret = freq_qos_add_request(&policy->constraints,
 					   policy->min_freq_req, FREQ_QOS_MIN,
-					   init_min_freq);
+					   FREQ_QOS_MIN_DEFAULT_VALUE);
 		if (ret < 0) {
 			/*
 			 * So we don't call freq_qos_remove_request() for an
--- a/include/linux/cpufreq.h
+++ b/include/linux/cpufreq.h
@@ -414,12 +414,6 @@ struct cpufreq_driver {
 	 * policy is properly initialized, but before the governor is started.
 	 */
 	void		(*register_em)(struct cpufreq_policy *policy);
-
-	/*
-	 * Set by drivers that want to initialize the policy->min_freq_req with
-	 * a value different from the default value (0) in cpufreq core.
-	 */
-	int		(*get_init_min_freq)(struct cpufreq_policy *policy);
 };
 
 /* flags */