add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/cpuidle/governor.c
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@@ -11,20 +11,24 @@
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 #include <linux/cpu.h>
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 #include <linux/cpuidle.h>
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 #include <linux/mutex.h>
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+#include <linux/module.h>
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 #include <linux/pm_qos.h>
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 #include "cpuidle.h"
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+char param_governor[CPUIDLE_NAME_LEN];
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+
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 LIST_HEAD(cpuidle_governors);
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 struct cpuidle_governor *cpuidle_curr_governor;
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+struct cpuidle_governor *cpuidle_prev_governor;
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 /**
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- * __cpuidle_find_governor - finds a governor of the specified name
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+ * cpuidle_find_governor - finds a governor of the specified name
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  * @str: the name
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  *
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  * Must be called with cpuidle_lock acquired.
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  */
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-static struct cpuidle_governor * __cpuidle_find_governor(const char *str)
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+struct cpuidle_governor *cpuidle_find_governor(const char *str)
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 {
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 	struct cpuidle_governor *gov;
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@@ -84,11 +88,14 @@
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 		return -ENODEV;
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 	mutex_lock(&cpuidle_lock);
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-	if (__cpuidle_find_governor(gov->name) == NULL) {
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+	if (cpuidle_find_governor(gov->name) == NULL) {
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 		ret = 0;
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 		list_add_tail(&gov->governor_list, &cpuidle_governors);
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 		if (!cpuidle_curr_governor ||
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-		    cpuidle_curr_governor->rating < gov->rating)
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+		    !strncasecmp(param_governor, gov->name, CPUIDLE_NAME_LEN) ||
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+		    (cpuidle_curr_governor->rating < gov->rating &&
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+		     strncasecmp(param_governor, cpuidle_curr_governor->name,
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+				 CPUIDLE_NAME_LEN)))
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 			cpuidle_switch_governor(gov);
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 	}
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 	mutex_unlock(&cpuidle_lock);
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@@ -101,11 +108,15 @@
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  * cpuidle_governor_latency_req - Compute a latency constraint for CPU
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  * @cpu: Target CPU
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  */
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-int cpuidle_governor_latency_req(unsigned int cpu)
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+s64 cpuidle_governor_latency_req(unsigned int cpu)
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 {
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-	int global_req = pm_qos_request(PM_QOS_CPU_DMA_LATENCY);
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 	struct device *device = get_cpu_device(cpu);
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-	int device_req = dev_pm_qos_raw_read_value(device);
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+	int device_req = dev_pm_qos_raw_resume_latency(device);
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+	int global_req = cpu_latency_qos_limit();
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-	return device_req < global_req ? device_req : global_req;
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+	if (device_req > global_req)
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+		device_req = global_req;
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+
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+	return (s64)device_req * NSEC_PER_USEC;
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 }
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+EXPORT_SYMBOL_GPL(cpuidle_governor_latency_req);