mk-rootfs.sh

hc

2023-12-11 072de836f53be56a70cecf70b43ae43b7ce17376

 kernel/drivers/cpufreq/ppc_cbe_cpufreq_pmi.c
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@@ -1,23 +1,10 @@
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+// SPDX-License-Identifier: GPL-2.0-or-later
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 /*
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  * pmi backend for the cbe_cpufreq driver
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  *
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  * (C) Copyright IBM Deutschland Entwicklung GmbH 2005-2007
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  *
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  * Author: Christian Krafft <krafft@de.ibm.com>
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License as published by
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- * the Free Software Foundation; either version 2, or (at your option)
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- * any later version.
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- *
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- * This program is distributed in the hope that it will be useful,
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- * but WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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- * GNU General Public License for more details.
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- *
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- * You should have received a copy of the GNU General Public License
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- * along with this program; if not, write to the Free Software
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- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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  */
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9
 
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 #include <linux/kernel.h>
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@@ -25,6 +12,7 @@
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 #include <linux/timer.h>
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 #include <linux/init.h>
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 #include <linux/of_platform.h>
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+#include <linux/pm_qos.h>
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 #include <asm/processor.h>
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 #include <asm/prom.h>
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@@ -36,8 +24,6 @@
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 #endif
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 #include "ppc_cbe_cpufreq.h"
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-
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-static u8 pmi_slow_mode_limit[MAX_CBE];
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 bool cbe_cpufreq_has_pmi = false;
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 EXPORT_SYMBOL_GPL(cbe_cpufreq_has_pmi);
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@@ -78,64 +64,88 @@
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64
 
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 static void cbe_cpufreq_handle_pmi(pmi_message_t pmi_msg)
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 {
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+	struct cpufreq_policy *policy;
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+	struct freq_qos_request *req;
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 	u8 node, slow_mode;
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+	int cpu, ret;
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 	BUG_ON(pmi_msg.type != PMI_TYPE_FREQ_CHANGE);
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 	node = pmi_msg.data1;
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 	slow_mode = pmi_msg.data2;
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-	pmi_slow_mode_limit[node] = slow_mode;
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+	cpu = cbe_node_to_cpu(node);
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 	pr_debug("cbe_handle_pmi: node: %d max_freq: %d\n", node, slow_mode);
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-}
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-static int pmi_notifier(struct notifier_block *nb,
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-				       unsigned long event, void *data)
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-{
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-	struct cpufreq_policy *policy = data;
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-	struct cpufreq_frequency_table *cbe_freqs = policy->freq_table;
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-	u8 node;
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-
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-	/* Should this really be called for CPUFREQ_ADJUST and CPUFREQ_NOTIFY
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-	 * policy events?)
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-	 */
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-	node = cbe_cpu_to_node(policy->cpu);
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-
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-	pr_debug("got notified, event=%lu, node=%u\n", event, node);
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-
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-	if (pmi_slow_mode_limit[node] != 0) {
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-		pr_debug("limiting node %d to slow mode %d\n",
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-			 node, pmi_slow_mode_limit[node]);
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-
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-		cpufreq_verify_within_limits(policy, 0,
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-
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-			cbe_freqs[pmi_slow_mode_limit[node]].frequency);
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+	policy = cpufreq_cpu_get(cpu);
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+	if (!policy) {
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+		pr_warn("cpufreq policy not found cpu%d\n", cpu);
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+		return;
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 	}
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-	return 0;
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-}
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+	req = policy->driver_data;
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-static struct notifier_block pmi_notifier_block = {
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-	.notifier_call = pmi_notifier,
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-};
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+	ret = freq_qos_update_request(req,
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+			policy->freq_table[slow_mode].frequency);
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+	if (ret < 0)
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+		pr_warn("Failed to update freq constraint: %d\n", ret);
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+	else
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+		pr_debug("limiting node %d to slow mode %d\n", node, slow_mode);
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+
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+	cpufreq_cpu_put(policy);
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+}
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 static struct pmi_handler cbe_pmi_handler = {
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 	.type			= PMI_TYPE_FREQ_CHANGE,
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 	.handle_pmi_message	= cbe_cpufreq_handle_pmi,
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 };
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-
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-
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-static int __init cbe_cpufreq_pmi_init(void)
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+void cbe_cpufreq_pmi_policy_init(struct cpufreq_policy *policy)
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 {
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-	cbe_cpufreq_has_pmi = pmi_register_handler(&cbe_pmi_handler) == 0;
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+	struct freq_qos_request *req;
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+	int ret;
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 	if (!cbe_cpufreq_has_pmi)
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-		return -ENODEV;
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+		return;
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-	cpufreq_register_notifier(&pmi_notifier_block, CPUFREQ_POLICY_NOTIFIER);
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+	req = kzalloc(sizeof(*req), GFP_KERNEL);
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+	if (!req)
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+		return;
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-	return 0;
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+	ret = freq_qos_add_request(&policy->constraints, req, FREQ_QOS_MAX,
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+				   policy->freq_table[0].frequency);
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+	if (ret < 0) {
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+		pr_err("Failed to add freq constraint (%d)\n", ret);
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+		kfree(req);
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+		return;
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+	}
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+
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+	policy->driver_data = req;
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 }
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-device_initcall(cbe_cpufreq_pmi_init);
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+EXPORT_SYMBOL_GPL(cbe_cpufreq_pmi_policy_init);
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+
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+void cbe_cpufreq_pmi_policy_exit(struct cpufreq_policy *policy)
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+{
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+	struct freq_qos_request *req = policy->driver_data;
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+
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+	if (cbe_cpufreq_has_pmi) {
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+		freq_qos_remove_request(req);
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+		kfree(req);
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+	}
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+}
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+EXPORT_SYMBOL_GPL(cbe_cpufreq_pmi_policy_exit);
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+
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+void cbe_cpufreq_pmi_init(void)
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+{
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+	if (!pmi_register_handler(&cbe_pmi_handler))
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+		cbe_cpufreq_has_pmi = true;
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+}
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+EXPORT_SYMBOL_GPL(cbe_cpufreq_pmi_init);
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+
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+void cbe_cpufreq_pmi_exit(void)
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+{
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+	pmi_unregister_handler(&cbe_pmi_handler);
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+	cbe_cpufreq_has_pmi = false;
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+}
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+EXPORT_SYMBOL_GPL(cbe_cpufreq_pmi_exit);