[linux.git] / drivers / cpuidle / cpuidle-powernv.c

/*
 *  cpuidle-powernv - idle state cpuidle driver.
 *  Adapted from drivers/cpuidle/cpuidle-pseries
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/moduleparam.h>
#include <linux/cpuidle.h>
#include <linux/cpu.h>
#include <linux/notifier.h>
#include <linux/clockchips.h>
#include <linux/of.h>
#include <linux/slab.h>

#include <asm/machdep.h>
#include <asm/firmware.h>
#include <asm/opal.h>
#include <asm/runlatch.h>
#include <asm/cpuidle.h>

/*
 * Expose only those Hardware idle states via the cpuidle framework
 * that have latency value below POWERNV_THRESHOLD_LATENCY_NS.
 */
#define POWERNV_THRESHOLD_LATENCY_NS 200000

static struct cpuidle_driver powernv_idle_driver = {
	.name             = "powernv_idle",
	.owner            = THIS_MODULE,
};

static int max_idle_state;
static struct cpuidle_state *cpuidle_state_table;

struct stop_psscr_table {
	u64 val;
	u64 mask;
};

static struct stop_psscr_table stop_psscr_table[CPUIDLE_STATE_MAX];

static u64 snooze_timeout;
static bool snooze_timeout_en;

static int snooze_loop(struct cpuidle_device *dev,
			struct cpuidle_driver *drv,
			int index)
{
	u64 snooze_exit_time;

	local_irq_enable();
	set_thread_flag(TIF_POLLING_NRFLAG);

	snooze_exit_time = get_tb() + snooze_timeout;
	ppc64_runlatch_off();
	while (!need_resched()) {
		HMT_low();
		HMT_very_low();
		if (snooze_timeout_en && get_tb() > snooze_exit_time)
			break;
	}

	HMT_medium();
	ppc64_runlatch_on();
	clear_thread_flag(TIF_POLLING_NRFLAG);
	smp_mb();
	return index;
}

static int nap_loop(struct cpuidle_device *dev,
			struct cpuidle_driver *drv,
			int index)
{
	ppc64_runlatch_off();
	power7_idle();
	ppc64_runlatch_on();
	return index;
}

/* Register for fastsleep only in oneshot mode of broadcast */
#ifdef CONFIG_TICK_ONESHOT
static int fastsleep_loop(struct cpuidle_device *dev,
				struct cpuidle_driver *drv,
				int index)
{
	unsigned long old_lpcr = mfspr(SPRN_LPCR);
	unsigned long new_lpcr;

	if (unlikely(system_state < SYSTEM_RUNNING))
		return index;

	new_lpcr = old_lpcr;
	/* Do not exit powersave upon decrementer as we've setup the timer
	 * offload.
	 */
	new_lpcr &= ~LPCR_PECE1;

	mtspr(SPRN_LPCR, new_lpcr);
	power7_sleep();

	mtspr(SPRN_LPCR, old_lpcr);

	return index;
}
#endif

static int stop_loop(struct cpuidle_device *dev,
		     struct cpuidle_driver *drv,
		     int index)
{
	ppc64_runlatch_off();
	power9_idle_stop(stop_psscr_table[index].val,
			 stop_psscr_table[index].mask);
	ppc64_runlatch_on();
	return index;
}

/*
 * States for dedicated partition case.
 */
static struct cpuidle_state powernv_states[CPUIDLE_STATE_MAX] = {
	{ /* Snooze */
		.name = "snooze",
		.desc = "snooze",
		.exit_latency = 0,
		.target_residency = 0,
		.enter = snooze_loop },
};

static int powernv_cpuidle_cpu_online(unsigned int cpu)
{
	struct cpuidle_device *dev = per_cpu(cpuidle_devices, cpu);

	if (dev && cpuidle_get_driver()) {
		cpuidle_pause_and_lock();
		cpuidle_enable_device(dev);
		cpuidle_resume_and_unlock();
	}
	return 0;
}

static int powernv_cpuidle_cpu_dead(unsigned int cpu)
{
	struct cpuidle_device *dev = per_cpu(cpuidle_devices, cpu);

	if (dev && cpuidle_get_driver()) {
		cpuidle_pause_and_lock();
		cpuidle_disable_device(dev);
		cpuidle_resume_and_unlock();
	}
	return 0;
}

/*
 * powernv_cpuidle_driver_init()
 */
static int powernv_cpuidle_driver_init(void)
{
	int idle_state;
	struct cpuidle_driver *drv = &powernv_idle_driver;

	drv->state_count = 0;

	for (idle_state = 0; idle_state < max_idle_state; ++idle_state) {
		/* Is the state not enabled? */
		if (cpuidle_state_table[idle_state].enter == NULL)
			continue;

		drv->states[drv->state_count] =	/* structure copy */
			cpuidle_state_table[idle_state];

		drv->state_count += 1;
	}

	return 0;
}

static inline void add_powernv_state(int index, const char *name,
				     unsigned int flags,
				     int (*idle_fn)(struct cpuidle_device *,
						    struct cpuidle_driver *,
						    int),
				     unsigned int target_residency,
				     unsigned int exit_latency,
				     u64 psscr_val, u64 psscr_mask)
{
	strlcpy(powernv_states[index].name, name, CPUIDLE_NAME_LEN);
	strlcpy(powernv_states[index].desc, name, CPUIDLE_NAME_LEN);
	powernv_states[index].flags = flags;
	powernv_states[index].target_residency = target_residency;
	powernv_states[index].exit_latency = exit_latency;
	powernv_states[index].enter = idle_fn;
	stop_psscr_table[index].val = psscr_val;
	stop_psscr_table[index].mask = psscr_mask;
}

static int powernv_add_idle_states(void)
{
	struct device_node *power_mgt;
	int nr_idle_states = 1; /* Snooze */
	int dt_idle_states;
	u32 latency_ns[CPUIDLE_STATE_MAX];
	u32 residency_ns[CPUIDLE_STATE_MAX];
	u32 flags[CPUIDLE_STATE_MAX];
	u64 psscr_val[CPUIDLE_STATE_MAX];
	u64 psscr_mask[CPUIDLE_STATE_MAX];
	const char *names[CPUIDLE_STATE_MAX];
	u32 has_stop_states = 0;
	int i, rc;

	/* Currently we have snooze statically defined */

	power_mgt = of_find_node_by_path("/ibm,opal/power-mgt");
	if (!power_mgt) {
		pr_warn("opal: PowerMgmt Node not found\n");
		goto out;
	}

	/* Read values of any property to determine the num of idle states */
	dt_idle_states = of_property_count_u32_elems(power_mgt, "ibm,cpu-idle-state-flags");
	if (dt_idle_states < 0) {
		pr_warn("cpuidle-powernv: no idle states found in the DT\n");
		goto out;
	}

	/*
	 * Since snooze is used as first idle state, max idle states allowed is
	 * CPUIDLE_STATE_MAX -1
	 */
	if (dt_idle_states > CPUIDLE_STATE_MAX - 1) {
		pr_warn("cpuidle-powernv: discovered idle states more than allowed");
		dt_idle_states = CPUIDLE_STATE_MAX - 1;
	}

	if (of_property_read_u32_array(power_mgt,
			"ibm,cpu-idle-state-flags", flags, dt_idle_states)) {
		pr_warn("cpuidle-powernv : missing ibm,cpu-idle-state-flags in DT\n");
		goto out;
	}

	if (of_property_read_u32_array(power_mgt,
		"ibm,cpu-idle-state-latencies-ns", latency_ns,
		dt_idle_states)) {
		pr_warn("cpuidle-powernv: missing ibm,cpu-idle-state-latencies-ns in DT\n");
		goto out;
	}
	if (of_property_read_string_array(power_mgt,
		"ibm,cpu-idle-state-names", names, dt_idle_states) < 0) {
		pr_warn("cpuidle-powernv: missing ibm,cpu-idle-state-names in DT\n");
		goto out;
	}

	/*
	 * If the idle states use stop instruction, probe for psscr values
	 * and psscr mask which are necessary to specify required stop level.
	 */
	has_stop_states = (flags[0] &
			   (OPAL_PM_STOP_INST_FAST | OPAL_PM_STOP_INST_DEEP));
	if (has_stop_states) {
		if (of_property_read_u64_array(power_mgt,
		    "ibm,cpu-idle-state-psscr", psscr_val, dt_idle_states)) {
			pr_warn("cpuidle-powernv: missing ibm,cpu-idle-state-psscr in DT\n");
			goto out;
		}

		if (of_property_read_u64_array(power_mgt,
					       "ibm,cpu-idle-state-psscr-mask",
						psscr_mask, dt_idle_states)) {
			pr_warn("cpuidle-powernv:Missing ibm,cpu-idle-state-psscr-mask in DT\n");
			goto out;
		}
	}

	rc = of_property_read_u32_array(power_mgt,
		"ibm,cpu-idle-state-residency-ns", residency_ns, dt_idle_states);

	for (i = 0; i < dt_idle_states; i++) {
		unsigned int exit_latency, target_residency;
		/*
		 * If an idle state has exit latency beyond
		 * POWERNV_THRESHOLD_LATENCY_NS then don't use it
		 * in cpu-idle.
		 */
		if (latency_ns[i] > POWERNV_THRESHOLD_LATENCY_NS)
			continue;
		/*
		 * Firmware passes residency and latency values in ns.
		 * cpuidle expects it in us.
		 */
		exit_latency = latency_ns[i] / 1000;
		if (!rc)
			target_residency = residency_ns[i] / 1000;
		else
			target_residency = 0;

		if (has_stop_states) {
			int err = validate_psscr_val_mask(&psscr_val[i],
							  &psscr_mask[i],
							  flags[i]);
			if (err) {
				report_invalid_psscr_val(psscr_val[i], err);
				continue;
			}
		}

		/*
		 * For nap and fastsleep, use default target_residency
		 * values if f/w does not expose it.
		 */
		if (flags[i] & OPAL_PM_NAP_ENABLED) {
			if (!rc)
				target_residency = 100;
			/* Add NAP state */
			add_powernv_state(nr_idle_states, "Nap",
					  CPUIDLE_FLAG_NONE, nap_loop,
					  target_residency, exit_latency, 0, 0);
		} else if ((flags[i] & OPAL_PM_STOP_INST_FAST) &&
				!(flags[i] & OPAL_PM_TIMEBASE_STOP)) {
			add_powernv_state(nr_idle_states, names[i],
					  CPUIDLE_FLAG_NONE, stop_loop,
					  target_residency, exit_latency,
					  psscr_val[i], psscr_mask[i]);
		}

		/*
		 * All cpuidle states with CPUIDLE_FLAG_TIMER_STOP set must come
		 * within this config dependency check.
		 */
#ifdef CONFIG_TICK_ONESHOT
		if (flags[i] & OPAL_PM_SLEEP_ENABLED ||
			flags[i] & OPAL_PM_SLEEP_ENABLED_ER1) {
			if (!rc)
				target_residency = 300000;
			/* Add FASTSLEEP state */
			add_powernv_state(nr_idle_states, "FastSleep",
					  CPUIDLE_FLAG_TIMER_STOP,
					  fastsleep_loop,
					  target_residency, exit_latency, 0, 0);
		} else if ((flags[i] & OPAL_PM_STOP_INST_DEEP) &&
				(flags[i] & OPAL_PM_TIMEBASE_STOP)) {
			add_powernv_state(nr_idle_states, names[i],
					  CPUIDLE_FLAG_TIMER_STOP, stop_loop,
					  target_residency, exit_latency,
					  psscr_val[i], psscr_mask[i]);
		}
#endif
		nr_idle_states++;
	}
out:
	return nr_idle_states;
}

/*
 * powernv_idle_probe()
 * Choose state table for shared versus dedicated partition
 */
static int powernv_idle_probe(void)
{
	if (cpuidle_disable != IDLE_NO_OVERRIDE)
		return -ENODEV;

	if (firmware_has_feature(FW_FEATURE_OPAL)) {
		cpuidle_state_table = powernv_states;
		/* Device tree can indicate more idle states */
		max_idle_state = powernv_add_idle_states();
		if (max_idle_state > 1) {
			snooze_timeout_en = true;
			snooze_timeout = powernv_states[1].target_residency *
					 tb_ticks_per_usec;
		}
 	} else
 		return -ENODEV;

	return 0;
}

static int __init powernv_processor_idle_init(void)
{
	int retval;

	retval = powernv_idle_probe();
	if (retval)
		return retval;

	powernv_cpuidle_driver_init();
	retval = cpuidle_register(&powernv_idle_driver, NULL);
	if (retval) {
		printk(KERN_DEBUG "Registration of powernv driver failed.\n");
		return retval;
	}

	retval = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN,
					   "cpuidle/powernv:online",
					   powernv_cpuidle_cpu_online, NULL);
	WARN_ON(retval < 0);
	retval = cpuhp_setup_state_nocalls(CPUHP_CPUIDLE_DEAD,
					   "cpuidle/powernv:dead", NULL,
					   powernv_cpuidle_cpu_dead);
	WARN_ON(retval < 0);
	printk(KERN_DEBUG "powernv_idle_driver registered\n");
	return 0;
}

device_initcall(powernv_processor_idle_init);
Commit	Line	Data
2c2e6ecf DD	1	/*
	2	* cpuidle-powernv - idle state cpuidle driver.
	3	* Adapted from drivers/cpuidle/cpuidle-pseries
	4	*
	5	*/
	6
	7	#include <linux/kernel.h>
	8	#include <linux/module.h>
	9	#include <linux/init.h>
	10	#include <linux/moduleparam.h>
	11	#include <linux/cpuidle.h>
	12	#include <linux/cpu.h>
	13	#include <linux/notifier.h>
0d948730	14	#include <linux/clockchips.h>
0888839c	15	#include <linux/of.h>
92c83ff5	16	#include <linux/slab.h>
2c2e6ecf DD	17
	18	#include <asm/machdep.h>
	19	#include <asm/firmware.h>
8eb8ac89	20	#include <asm/opal.h>
591ac0cb	21	#include <asm/runlatch.h>
09206b60	22	#include <asm/cpuidle.h>
2c2e6ecf	23
9e9fc6f0 GS	24	/*
	25	* Expose only those Hardware idle states via the cpuidle framework
	26	* that have latency value below POWERNV_THRESHOLD_LATENCY_NS.
	27	*/
3005c597 SP	28	#define POWERNV_THRESHOLD_LATENCY_NS 200000
3005c597 SP	29
ed61390b	30	static struct cpuidle_driver powernv_idle_driver = {
2c2e6ecf DD	31	.name = "powernv_idle",
	32	.owner = THIS_MODULE,
	33	};
	34
	35	static int max_idle_state;
	36	static struct cpuidle_state *cpuidle_state_table;
3005c597	37
09206b60 GS	38	struct stop_psscr_table {
	39	u64 val;
	40	u64 mask;
	41	};
	42
	43	static struct stop_psscr_table stop_psscr_table[CPUIDLE_STATE_MAX];
3005c597	44
78eaa10f SB	45	static u64 snooze_timeout;
78eaa10f SB	46	static bool snooze_timeout_en;
2c2e6ecf DD	47
	48	static int snooze_loop(struct cpuidle_device *dev,
	49	struct cpuidle_driver *drv,
	50	int index)
	51	{
78eaa10f SB	52	u64 snooze_exit_time;
78eaa10f SB	53
2c2e6ecf DD	54	local_irq_enable();
	55	set_thread_flag(TIF_POLLING_NRFLAG);
	56
78eaa10f	57	snooze_exit_time = get_tb() + snooze_timeout;
591ac0cb	58	ppc64_runlatch_off();
2c2e6ecf DD	59	while (!need_resched()) {
	60	HMT_low();
	61	HMT_very_low();
78eaa10f SB	62	if (snooze_timeout_en && get_tb() > snooze_exit_time)
78eaa10f SB	63	break;
2c2e6ecf DD	64	}
	65
	66	HMT_medium();
591ac0cb	67	ppc64_runlatch_on();
2c2e6ecf DD	68	clear_thread_flag(TIF_POLLING_NRFLAG);
	69	smp_mb();
	70	return index;
	71	}
	72
	73	static int nap_loop(struct cpuidle_device *dev,
	74	struct cpuidle_driver *drv,
	75	int index)
	76	{
591ac0cb	77	ppc64_runlatch_off();
2c2e6ecf	78	power7_idle();
591ac0cb	79	ppc64_runlatch_on();
2c2e6ecf DD	80	return index;
	81	}
	82
cc5a2f7b	83	/* Register for fastsleep only in oneshot mode of broadcast */
cc5a2f7b	84	#ifdef CONFIG_TICK_ONESHOT
0d948730 PM	85	static int fastsleep_loop(struct cpuidle_device *dev,
	86	struct cpuidle_driver *drv,
	87	int index)
	88	{
	89	unsigned long old_lpcr = mfspr(SPRN_LPCR);
	90	unsigned long new_lpcr;
	91
	92	if (unlikely(system_state < SYSTEM_RUNNING))
	93	return index;
	94
	95	new_lpcr = old_lpcr;
9b6a68d9 MN	96	/* Do not exit powersave upon decrementer as we've setup the timer
9b6a68d9 MN	97	* offload.
0d948730	98	*/
9b6a68d9	99	new_lpcr &= ~LPCR_PECE1;
0d948730 PM	100
	101	mtspr(SPRN_LPCR, new_lpcr);
	102	power7_sleep();
	103
	104	mtspr(SPRN_LPCR, old_lpcr);
	105
	106	return index;
	107	}
cc5a2f7b	108	#endif
3005c597 SP	109
	110	static int stop_loop(struct cpuidle_device *dev,
	111	struct cpuidle_driver *drv,
	112	int index)
	113	{
	114	ppc64_runlatch_off();
09206b60 GS	115	power9_idle_stop(stop_psscr_table[index].val,
09206b60 GS	116	stop_psscr_table[index].mask);
3005c597 SP	117	ppc64_runlatch_on();
	118	return index;
	119	}
	120
2c2e6ecf DD	121	/*
	122	* States for dedicated partition case.
	123	*/
169f3fae	124	static struct cpuidle_state powernv_states[CPUIDLE_STATE_MAX] = {
2c2e6ecf DD	125	{ /* Snooze */
	126	.name = "snooze",
	127	.desc = "snooze",
2c2e6ecf DD	128	.exit_latency = 0,
2c2e6ecf DD	129	.target_residency = 0,
957efced	130	.enter = snooze_loop },
2c2e6ecf DD	131	};
2c2e6ecf DD	132
10fcca9d	133	static int powernv_cpuidle_cpu_online(unsigned int cpu)
2c2e6ecf	134	{
10fcca9d	135	struct cpuidle_device *dev = per_cpu(cpuidle_devices, cpu);
2c2e6ecf DD	136
2c2e6ecf DD	137	if (dev && cpuidle_get_driver()) {
10fcca9d SAS	138	cpuidle_pause_and_lock();
	139	cpuidle_enable_device(dev);
	140	cpuidle_resume_and_unlock();
	141	}
	142	return 0;
	143	}
2c2e6ecf	144
10fcca9d SAS	145	static int powernv_cpuidle_cpu_dead(unsigned int cpu)
	146	{
	147	struct cpuidle_device *dev = per_cpu(cpuidle_devices, cpu);
2c2e6ecf	148
10fcca9d SAS	149	if (dev && cpuidle_get_driver()) {
	150	cpuidle_pause_and_lock();
	151	cpuidle_disable_device(dev);
	152	cpuidle_resume_and_unlock();
2c2e6ecf	153	}
10fcca9d	154	return 0;
2c2e6ecf DD	155	}
2c2e6ecf DD	156
2c2e6ecf DD	157	/*
	158	* powernv_cpuidle_driver_init()
	159	*/
	160	static int powernv_cpuidle_driver_init(void)
	161	{
	162	int idle_state;
	163	struct cpuidle_driver *drv = &powernv_idle_driver;
	164
	165	drv->state_count = 0;
	166
	167	for (idle_state = 0; idle_state < max_idle_state; ++idle_state) {
	168	/* Is the state not enabled? */
	169	if (cpuidle_state_table[idle_state].enter == NULL)
	170	continue;
	171
	172	drv->states[drv->state_count] = /* structure copy */
	173	cpuidle_state_table[idle_state];
	174
	175	drv->state_count += 1;
	176	}
	177
	178	return 0;
	179	}
	180
9e9fc6f0 GS	181	static inline void add_powernv_state(int index, const char *name,
	182	unsigned int flags,
	183	int (idle_fn)(struct cpuidle_device ,
	184	struct cpuidle_driver *,
	185	int),
	186	unsigned int target_residency,
	187	unsigned int exit_latency,
09206b60	188	u64 psscr_val, u64 psscr_mask)
9e9fc6f0 GS	189	{
	190	strlcpy(powernv_states[index].name, name, CPUIDLE_NAME_LEN);
	191	strlcpy(powernv_states[index].desc, name, CPUIDLE_NAME_LEN);
	192	powernv_states[index].flags = flags;
	193	powernv_states[index].target_residency = target_residency;
	194	powernv_states[index].exit_latency = exit_latency;
	195	powernv_states[index].enter = idle_fn;
09206b60 GS	196	stop_psscr_table[index].val = psscr_val;
09206b60 GS	197	stop_psscr_table[index].mask = psscr_mask;
9e9fc6f0 GS	198	}
9e9fc6f0 GS	199
0888839c PM	200	static int powernv_add_idle_states(void)
	201	{
	202	struct device_node *power_mgt;
0888839c PM	203	int nr_idle_states = 1; /* Snooze */
0888839c PM	204	int dt_idle_states;
957efced SP	205	u32 latency_ns[CPUIDLE_STATE_MAX];
	206	u32 residency_ns[CPUIDLE_STATE_MAX];
	207	u32 flags[CPUIDLE_STATE_MAX];
3005c597	208	u64 psscr_val[CPUIDLE_STATE_MAX];
09206b60	209	u64 psscr_mask[CPUIDLE_STATE_MAX];
3005c597	210	const char *names[CPUIDLE_STATE_MAX];
09206b60	211	u32 has_stop_states = 0;
92c83ff5	212	int i, rc;
0888839c PM	213
	214	/* Currently we have snooze statically defined */
	215
	216	power_mgt = of_find_node_by_path("/ibm,opal/power-mgt");
	217	if (!power_mgt) {
	218	pr_warn("opal: PowerMgmt Node not found\n");
92c83ff5	219	goto out;
0888839c PM	220	}
0888839c PM	221
70734a78 PM	222	/* Read values of any property to determine the num of idle states */
	223	dt_idle_states = of_property_count_u32_elems(power_mgt, "ibm,cpu-idle-state-flags");
	224	if (dt_idle_states < 0) {
	225	pr_warn("cpuidle-powernv: no idle states found in the DT\n");
92c83ff5	226	goto out;
0888839c PM	227	}
0888839c PM	228
957efced SP	229	/*
	230	* Since snooze is used as first idle state, max idle states allowed is
	231	* CPUIDLE_STATE_MAX -1
	232	*/
	233	if (dt_idle_states > CPUIDLE_STATE_MAX - 1) {
	234	pr_warn("cpuidle-powernv: discovered idle states more than allowed");
	235	dt_idle_states = CPUIDLE_STATE_MAX - 1;
	236	}
	237
70734a78 PM	238	if (of_property_read_u32_array(power_mgt,
	239	"ibm,cpu-idle-state-flags", flags, dt_idle_states)) {
	240	pr_warn("cpuidle-powernv : missing ibm,cpu-idle-state-flags in DT\n");
957efced	241	goto out;
70734a78	242	}
92c83ff5	243
957efced SP	244	if (of_property_read_u32_array(power_mgt,
	245	"ibm,cpu-idle-state-latencies-ns", latency_ns,
	246	dt_idle_states)) {
92c83ff5	247	pr_warn("cpuidle-powernv: missing ibm,cpu-idle-state-latencies-ns in DT\n");
957efced	248	goto out;
74aa51b5	249	}
3005c597 SP	250	if (of_property_read_string_array(power_mgt,
	251	"ibm,cpu-idle-state-names", names, dt_idle_states) < 0) {
	252	pr_warn("cpuidle-powernv: missing ibm,cpu-idle-state-names in DT\n");
	253	goto out;
	254	}
	255
	256	/*
	257	* If the idle states use stop instruction, probe for psscr values
09206b60	258	* and psscr mask which are necessary to specify required stop level.
3005c597	259	*/
09206b60 GS	260	has_stop_states = (flags[0] &
	261	(OPAL_PM_STOP_INST_FAST \| OPAL_PM_STOP_INST_DEEP));
	262	if (has_stop_states) {
3005c597 SP	263	if (of_property_read_u64_array(power_mgt,
3005c597 SP	264	"ibm,cpu-idle-state-psscr", psscr_val, dt_idle_states)) {
09206b60	265	pr_warn("cpuidle-powernv: missing ibm,cpu-idle-state-psscr in DT\n");
3005c597 SP	266	goto out;
3005c597 SP	267	}
74aa51b5	268
09206b60 GS	269	if (of_property_read_u64_array(power_mgt,
	270	"ibm,cpu-idle-state-psscr-mask",
	271	psscr_mask, dt_idle_states)) {
	272	pr_warn("cpuidle-powernv:Missing ibm,cpu-idle-state-psscr-mask in DT\n");
	273	goto out;
	274	}
	275	}
	276
92c83ff5 PM	277	rc = of_property_read_u32_array(power_mgt,
92c83ff5 PM	278	"ibm,cpu-idle-state-residency-ns", residency_ns, dt_idle_states);
0888839c PM	279
0888839c PM	280	for (i = 0; i < dt_idle_states; i++) {
9e9fc6f0	281	unsigned int exit_latency, target_residency;
3005c597 SP	282	/*
	283	* If an idle state has exit latency beyond
	284	* POWERNV_THRESHOLD_LATENCY_NS then don't use it
	285	* in cpu-idle.
	286	*/
	287	if (latency_ns[i] > POWERNV_THRESHOLD_LATENCY_NS)
	288	continue;
9e9fc6f0 GS	289	/*
	290	* Firmware passes residency and latency values in ns.
	291	* cpuidle expects it in us.
	292	*/
	293	exit_latency = latency_ns[i] / 1000;
	294	if (!rc)
	295	target_residency = residency_ns[i] / 1000;
	296	else
	297	target_residency = 0;
0888839c	298
09206b60 GS	299	if (has_stop_states) {
	300	int err = validate_psscr_val_mask(&psscr_val[i],
	301	&psscr_mask[i],
	302	flags[i]);
	303	if (err) {
	304	report_invalid_psscr_val(psscr_val[i], err);
	305	continue;
	306	}
	307	}
	308
92c83ff5	309	/*
9e9fc6f0 GS	310	* For nap and fastsleep, use default target_residency
9e9fc6f0 GS	311	* values if f/w does not expose it.
74aa51b5	312	*/
70734a78	313	if (flags[i] & OPAL_PM_NAP_ENABLED) {
9e9fc6f0 GS	314	if (!rc)
9e9fc6f0 GS	315	target_residency = 100;
0888839c	316	/* Add NAP state */
9e9fc6f0 GS	317	add_powernv_state(nr_idle_states, "Nap",
9e9fc6f0 GS	318	CPUIDLE_FLAG_NONE, nap_loop,
09206b60	319	target_residency, exit_latency, 0, 0);
3005c597 SP	320	} else if ((flags[i] & OPAL_PM_STOP_INST_FAST) &&
3005c597 SP	321	!(flags[i] & OPAL_PM_TIMEBASE_STOP)) {
9e9fc6f0 GS	322	add_powernv_state(nr_idle_states, names[i],
	323	CPUIDLE_FLAG_NONE, stop_loop,
	324	target_residency, exit_latency,
09206b60	325	psscr_val[i], psscr_mask[i]);
cc5a2f7b	326	}
	327
	328	/*
	329	* All cpuidle states with CPUIDLE_FLAG_TIMER_STOP set must come
	330	* within this config dependency check.
	331	*/
	332	#ifdef CONFIG_TICK_ONESHOT
	333	if (flags[i] & OPAL_PM_SLEEP_ENABLED \|\|
70734a78	334	flags[i] & OPAL_PM_SLEEP_ENABLED_ER1) {
9e9fc6f0 GS	335	if (!rc)
9e9fc6f0 GS	336	target_residency = 300000;
0888839c	337	/* Add FASTSLEEP state */
9e9fc6f0 GS	338	add_powernv_state(nr_idle_states, "FastSleep",
	339	CPUIDLE_FLAG_TIMER_STOP,
	340	fastsleep_loop,
09206b60	341	target_residency, exit_latency, 0, 0);
3005c597 SP	342	} else if ((flags[i] & OPAL_PM_STOP_INST_DEEP) &&
3005c597 SP	343	(flags[i] & OPAL_PM_TIMEBASE_STOP)) {
9e9fc6f0 GS	344	add_powernv_state(nr_idle_states, names[i],
	345	CPUIDLE_FLAG_TIMER_STOP, stop_loop,
	346	target_residency, exit_latency,
09206b60	347	psscr_val[i], psscr_mask[i]);
0888839c	348	}
cc5a2f7b	349	#endif
92c83ff5	350	nr_idle_states++;
0888839c	351	}
92c83ff5	352	out:
0888839c PM	353	return nr_idle_states;
	354	}
	355
2c2e6ecf DD	356	/*
	357	* powernv_idle_probe()
	358	* Choose state table for shared versus dedicated partition
	359	*/
	360	static int powernv_idle_probe(void)
	361	{
2c2e6ecf DD	362	if (cpuidle_disable != IDLE_NO_OVERRIDE)
	363	return -ENODEV;
	364
e4d54f71	365	if (firmware_has_feature(FW_FEATURE_OPAL)) {
2c2e6ecf	366	cpuidle_state_table = powernv_states;
0888839c PM	367	/* Device tree can indicate more idle states */
0888839c PM	368	max_idle_state = powernv_add_idle_states();
78eaa10f SB	369	if (max_idle_state > 1) {
	370	snooze_timeout_en = true;
	371	snooze_timeout = powernv_states[1].target_residency *
	372	tb_ticks_per_usec;
	373	}
2c2e6ecf DD	374	} else
	375	return -ENODEV;
	376
	377	return 0;
	378	}
	379
	380	static int __init powernv_processor_idle_init(void)
	381	{
	382	int retval;
	383
	384	retval = powernv_idle_probe();
	385	if (retval)
	386	return retval;
	387
	388	powernv_cpuidle_driver_init();
	389	retval = cpuidle_register(&powernv_idle_driver, NULL);
	390	if (retval) {
	391	printk(KERN_DEBUG "Registration of powernv driver failed.\n");
	392	return retval;
	393	}
	394
10fcca9d SAS	395	retval = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN,
	396	"cpuidle/powernv:online",
	397	powernv_cpuidle_cpu_online, NULL);
	398	WARN_ON(retval < 0);
	399	retval = cpuhp_setup_state_nocalls(CPUHP_CPUIDLE_DEAD,
	400	"cpuidle/powernv:dead", NULL,
	401	powernv_cpuidle_cpu_dead);
	402	WARN_ON(retval < 0);
2c2e6ecf DD	403	printk(KERN_DEBUG "powernv_idle_driver registered\n");
	404	return 0;
	405	}
	406
	407	device_initcall(powernv_processor_idle_init);