Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2)  * driver.c - driver support
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  * (C) 2006-2007 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  *               Shaohua Li <shaohua.li@intel.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *               Adam Belay <abelay@novell.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  * This code is licenced under the GPL.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/mutex.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/sched/idle.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/cpuidle.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/cpumask.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/tick.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/cpu.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include "cpuidle.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) DEFINE_SPINLOCK(cpuidle_driver_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #ifdef CONFIG_CPU_IDLE_MULTIPLE_DRIVERS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) static DEFINE_PER_CPU(struct cpuidle_driver *, cpuidle_drivers);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29)  * __cpuidle_get_cpu_driver - return the cpuidle driver tied to a CPU.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30)  * @cpu: the CPU handled by the driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32)  * Returns a pointer to struct cpuidle_driver or NULL if no driver has been
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33)  * registered for @cpu.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) static struct cpuidle_driver *__cpuidle_get_cpu_driver(int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	return per_cpu(cpuidle_drivers, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41)  * __cpuidle_unset_driver - unset per CPU driver variables.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42)  * @drv: a valid pointer to a struct cpuidle_driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44)  * For each CPU in the driver's CPU mask, unset the registered driver per CPU
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45)  * variable. If @drv is different from the registered driver, the corresponding
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46)  * variable is not cleared.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) static inline void __cpuidle_unset_driver(struct cpuidle_driver *drv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	int cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	for_each_cpu(cpu, drv->cpumask) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 		if (drv != __cpuidle_get_cpu_driver(cpu))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 		per_cpu(cpuidle_drivers, cpu) = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62)  * __cpuidle_set_driver - set per CPU driver variables for the given driver.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63)  * @drv: a valid pointer to a struct cpuidle_driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65)  * Returns 0 on success, -EBUSY if any CPU in the cpumask have a driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66)  * different from drv already.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) static inline int __cpuidle_set_driver(struct cpuidle_driver *drv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	int cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	for_each_cpu(cpu, drv->cpumask) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 		struct cpuidle_driver *old_drv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 		old_drv = __cpuidle_get_cpu_driver(cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 		if (old_drv && old_drv != drv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 			return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	for_each_cpu(cpu, drv->cpumask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 		per_cpu(cpuidle_drivers, cpu) = drv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) static struct cpuidle_driver *cpuidle_curr_driver;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91)  * __cpuidle_get_cpu_driver - return the global cpuidle driver pointer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92)  * @cpu: ignored without the multiple driver support
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94)  * Return a pointer to a struct cpuidle_driver object or NULL if no driver was
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95)  * previously registered.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) static inline struct cpuidle_driver *__cpuidle_get_cpu_driver(int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	return cpuidle_curr_driver;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)  * __cpuidle_set_driver - assign the global cpuidle driver variable.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)  * @drv: pointer to a struct cpuidle_driver object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)  * Returns 0 on success, -EBUSY if the driver is already registered.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) static inline int __cpuidle_set_driver(struct cpuidle_driver *drv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	if (cpuidle_curr_driver)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 		return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	cpuidle_curr_driver = drv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)  * __cpuidle_unset_driver - unset the global cpuidle driver variable.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)  * @drv: a pointer to a struct cpuidle_driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)  * Reset the global cpuidle variable to NULL.  If @drv does not match the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123)  * registered driver, do nothing.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) static inline void __cpuidle_unset_driver(struct cpuidle_driver *drv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	if (drv == cpuidle_curr_driver)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 		cpuidle_curr_driver = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)  * cpuidle_setup_broadcast_timer - enable/disable the broadcast timer on a cpu
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)  * @arg: a void pointer used to match the SMP cross call API
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)  * If @arg is NULL broadcast is disabled otherwise enabled
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)  * This function is executed per CPU by an SMP cross call.  It's not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)  * supposed to be called directly.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) static void cpuidle_setup_broadcast_timer(void *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	if (arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 		tick_broadcast_enable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 		tick_broadcast_disable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)  * __cpuidle_driver_init - initialize the driver's internal data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)  * @drv: a valid pointer to a struct cpuidle_driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) static void __cpuidle_driver_init(struct cpuidle_driver *drv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	 * Use all possible CPUs as the default, because if the kernel boots
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	 * with some CPUs offline and then we online one of them, the CPU
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	 * notifier has to know which driver to assign.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	if (!drv->cpumask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 		drv->cpumask = (struct cpumask *)cpu_possible_mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	for (i = 0; i < drv->state_count; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 		struct cpuidle_state *s = &drv->states[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 		 * Look for the timer stop flag in the different states and if
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 		 * it is found, indicate that the broadcast timer has to be set
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 		 * up.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 		if (s->flags & CPUIDLE_FLAG_TIMER_STOP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 			drv->bctimer = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 		 * The core will use the target residency and exit latency
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 		 * values in nanoseconds, but allow drivers to provide them in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 		 * microseconds too.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 		if (s->target_residency > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 			s->target_residency_ns = s->target_residency * NSEC_PER_USEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 		if (s->exit_latency > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 			s->exit_latency_ns = s->exit_latency * NSEC_PER_USEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191)  * __cpuidle_register_driver: register the driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192)  * @drv: a valid pointer to a struct cpuidle_driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194)  * Do some sanity checks, initialize the driver, assign the driver to the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195)  * global cpuidle driver variable(s) and set up the broadcast timer if the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196)  * cpuidle driver has some states that shut down the local timer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198)  * Returns 0 on success, a negative error code otherwise:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199)  *  * -EINVAL if the driver pointer is NULL or no idle states are available
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200)  *  * -ENODEV if the cpuidle framework is disabled
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201)  *  * -EBUSY if the driver is already assigned to the global variable(s)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) static int __cpuidle_register_driver(struct cpuidle_driver *drv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	if (!drv || !drv->state_count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	ret = cpuidle_coupled_state_verify(drv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	if (cpuidle_disabled())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 		return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	__cpuidle_driver_init(drv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	ret = __cpuidle_set_driver(drv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	if (drv->bctimer)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 		on_each_cpu_mask(drv->cpumask, cpuidle_setup_broadcast_timer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 				 (void *)1, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231)  * __cpuidle_unregister_driver - unregister the driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232)  * @drv: a valid pointer to a struct cpuidle_driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234)  * Check if the driver is no longer in use, reset the global cpuidle driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235)  * variable(s) and disable the timer broadcast notification mechanism if it was
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236)  * in use.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) static void __cpuidle_unregister_driver(struct cpuidle_driver *drv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	if (drv->bctimer) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 		drv->bctimer = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 		on_each_cpu_mask(drv->cpumask, cpuidle_setup_broadcast_timer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 				 NULL, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	__cpuidle_unset_driver(drv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251)  * cpuidle_register_driver - registers a driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252)  * @drv: a pointer to a valid struct cpuidle_driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254)  * Register the driver under a lock to prevent concurrent attempts to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255)  * [un]register the driver from occuring at the same time.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257)  * Returns 0 on success, a negative error code (returned by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258)  * __cpuidle_register_driver()) otherwise.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) int cpuidle_register_driver(struct cpuidle_driver *drv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 	struct cpuidle_governor *gov;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	spin_lock(&cpuidle_driver_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	ret = __cpuidle_register_driver(drv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	spin_unlock(&cpuidle_driver_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	if (!ret && !strlen(param_governor) && drv->governor &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	    (cpuidle_get_driver() == drv)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 		mutex_lock(&cpuidle_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 		gov = cpuidle_find_governor(drv->governor);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 		if (gov) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 			cpuidle_prev_governor = cpuidle_curr_governor;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 			if (cpuidle_switch_governor(gov) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 				cpuidle_prev_governor = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 		mutex_unlock(&cpuidle_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) EXPORT_SYMBOL_GPL(cpuidle_register_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286)  * cpuidle_unregister_driver - unregisters a driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287)  * @drv: a pointer to a valid struct cpuidle_driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289)  * Unregisters the cpuidle driver under a lock to prevent concurrent attempts
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290)  * to [un]register the driver from occuring at the same time.  @drv has to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291)  * match the currently registered driver.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) void cpuidle_unregister_driver(struct cpuidle_driver *drv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	bool enabled = (cpuidle_get_driver() == drv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	spin_lock(&cpuidle_driver_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	__cpuidle_unregister_driver(drv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 	spin_unlock(&cpuidle_driver_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	if (!enabled)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 	mutex_lock(&cpuidle_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 	if (cpuidle_prev_governor) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 		if (!cpuidle_switch_governor(cpuidle_prev_governor))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 			cpuidle_prev_governor = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 	mutex_unlock(&cpuidle_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) EXPORT_SYMBOL_GPL(cpuidle_unregister_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314)  * cpuidle_get_driver - return the driver tied to the current CPU.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316)  * Returns a struct cpuidle_driver pointer, or NULL if no driver is registered.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) struct cpuidle_driver *cpuidle_get_driver(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 	struct cpuidle_driver *drv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 	int cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 	cpu = get_cpu();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 	drv = __cpuidle_get_cpu_driver(cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 	put_cpu();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 	return drv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) EXPORT_SYMBOL_GPL(cpuidle_get_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332)  * cpuidle_get_cpu_driver - return the driver registered for a CPU.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333)  * @dev: a valid pointer to a struct cpuidle_device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335)  * Returns a struct cpuidle_driver pointer, or NULL if no driver is registered
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336)  * for the CPU associated with @dev.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) struct cpuidle_driver *cpuidle_get_cpu_driver(struct cpuidle_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 	if (!dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 	return __cpuidle_get_cpu_driver(dev->cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) EXPORT_SYMBOL_GPL(cpuidle_get_cpu_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348)  * cpuidle_driver_state_disabled - Disable or enable an idle state
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349)  * @drv: cpuidle driver owning the state
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350)  * @idx: State index
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351)  * @disable: Whether or not to disable the state
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) void cpuidle_driver_state_disabled(struct cpuidle_driver *drv, int idx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 				 bool disable)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 	unsigned int cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 	mutex_lock(&cpuidle_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 	spin_lock(&cpuidle_driver_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 	if (!drv->cpumask) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 		drv->states[idx].flags |= CPUIDLE_FLAG_UNUSABLE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 		goto unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 	for_each_cpu(cpu, drv->cpumask) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 		struct cpuidle_device *dev = per_cpu(cpuidle_devices, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 		if (!dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 		if (disable)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 			dev->states_usage[idx].disable |= CPUIDLE_STATE_DISABLED_BY_DRIVER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 			dev->states_usage[idx].disable &= ~CPUIDLE_STATE_DISABLED_BY_DRIVER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 	spin_unlock(&cpuidle_driver_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) 	mutex_unlock(&cpuidle_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) EXPORT_SYMBOL_GPL(cpuidle_driver_state_disabled);