[net-next-2.6.git] / drivers / acpi / processor_thermal.c

/*
 * processor_thermal.c - Passive cooling submodule of the ACPI processor driver
 *
 *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
 *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
 *  Copyright (C) 2004       Dominik Brodowski <linux@brodo.de>
 *  Copyright (C) 2004  Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
 *  			- Added processor hotplug support
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or (at
 *  your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful, but
 *  WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/cpufreq.h>
#include <linux/sysdev.h>

#include <asm/uaccess.h>

#include <acpi/acpi_bus.h>
#include <acpi/processor.h>
#include <acpi/acpi_drivers.h>

#define PREFIX "ACPI: "

#define ACPI_PROCESSOR_CLASS            "processor"
#define _COMPONENT              ACPI_PROCESSOR_COMPONENT
ACPI_MODULE_NAME("processor_thermal");

/* --------------------------------------------------------------------------
                                 Limit Interface
   -------------------------------------------------------------------------- */
static int acpi_processor_apply_limit(struct acpi_processor *pr)
{
	int result = 0;
	u16 px = 0;
	u16 tx = 0;


	if (!pr)
		return -EINVAL;

	if (!pr->flags.limit)
		return -ENODEV;

	if (pr->flags.throttling) {
		if (pr->limit.user.tx > tx)
			tx = pr->limit.user.tx;
		if (pr->limit.thermal.tx > tx)
			tx = pr->limit.thermal.tx;

		result = acpi_processor_set_throttling(pr, tx, false);
		if (result)
			goto end;
	}

	pr->limit.state.px = px;
	pr->limit.state.tx = tx;

	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
			  "Processor [%d] limit set to (P%d:T%d)\n", pr->id,
			  pr->limit.state.px, pr->limit.state.tx));

      end:
	if (result)
		printk(KERN_ERR PREFIX "Unable to set limit\n");

	return result;
}

#ifdef CONFIG_CPU_FREQ

/* If a passive cooling situation is detected, primarily CPUfreq is used, as it
 * offers (in most cases) voltage scaling in addition to frequency scaling, and
 * thus a cubic (instead of linear) reduction of energy. Also, we allow for
 * _any_ cpufreq driver and not only the acpi-cpufreq driver.
 */

#define CPUFREQ_THERMAL_MIN_STEP 0
#define CPUFREQ_THERMAL_MAX_STEP 3

static DEFINE_PER_CPU(unsigned int, cpufreq_thermal_reduction_pctg);
static unsigned int acpi_thermal_cpufreq_is_init = 0;

static int cpu_has_cpufreq(unsigned int cpu)
{
	struct cpufreq_policy policy;
	if (!acpi_thermal_cpufreq_is_init || cpufreq_get_policy(&policy, cpu))
		return 0;
	return 1;
}

static int acpi_thermal_cpufreq_increase(unsigned int cpu)
{
	if (!cpu_has_cpufreq(cpu))
		return -ENODEV;

	if (per_cpu(cpufreq_thermal_reduction_pctg, cpu) <
		CPUFREQ_THERMAL_MAX_STEP) {
		per_cpu(cpufreq_thermal_reduction_pctg, cpu)++;
		cpufreq_update_policy(cpu);
		return 0;
	}

	return -ERANGE;
}

static int acpi_thermal_cpufreq_decrease(unsigned int cpu)
{
	if (!cpu_has_cpufreq(cpu))
		return -ENODEV;

	if (per_cpu(cpufreq_thermal_reduction_pctg, cpu) >
		(CPUFREQ_THERMAL_MIN_STEP + 1))
		per_cpu(cpufreq_thermal_reduction_pctg, cpu)--;
	else
		per_cpu(cpufreq_thermal_reduction_pctg, cpu) = 0;
	cpufreq_update_policy(cpu);
	/* We reached max freq again and can leave passive mode */
	return !per_cpu(cpufreq_thermal_reduction_pctg, cpu);
}

static int acpi_thermal_cpufreq_notifier(struct notifier_block *nb,
					 unsigned long event, void *data)
{
	struct cpufreq_policy *policy = data;
	unsigned long max_freq = 0;

	if (event != CPUFREQ_ADJUST)
		goto out;

	max_freq = (
	    policy->cpuinfo.max_freq *
	    (100 - per_cpu(cpufreq_thermal_reduction_pctg, policy->cpu) * 20)
	) / 100;

	cpufreq_verify_within_limits(policy, 0, max_freq);

      out:
	return 0;
}

static struct notifier_block acpi_thermal_cpufreq_notifier_block = {
	.notifier_call = acpi_thermal_cpufreq_notifier,
};

static int cpufreq_get_max_state(unsigned int cpu)
{
	if (!cpu_has_cpufreq(cpu))
		return 0;

	return CPUFREQ_THERMAL_MAX_STEP;
}

static int cpufreq_get_cur_state(unsigned int cpu)
{
	if (!cpu_has_cpufreq(cpu))
		return 0;

	return per_cpu(cpufreq_thermal_reduction_pctg, cpu);
}

static int cpufreq_set_cur_state(unsigned int cpu, int state)
{
	if (!cpu_has_cpufreq(cpu))
		return 0;

	per_cpu(cpufreq_thermal_reduction_pctg, cpu) = state;
	cpufreq_update_policy(cpu);
	return 0;
}

void acpi_thermal_cpufreq_init(void)
{
	int i;

	for (i = 0; i < nr_cpu_ids; i++)
		if (cpu_present(i))
			per_cpu(cpufreq_thermal_reduction_pctg, i) = 0;

	i = cpufreq_register_notifier(&acpi_thermal_cpufreq_notifier_block,
				      CPUFREQ_POLICY_NOTIFIER);
	if (!i)
		acpi_thermal_cpufreq_is_init = 1;
}

void acpi_thermal_cpufreq_exit(void)
{
	if (acpi_thermal_cpufreq_is_init)
		cpufreq_unregister_notifier
		    (&acpi_thermal_cpufreq_notifier_block,
		     CPUFREQ_POLICY_NOTIFIER);

	acpi_thermal_cpufreq_is_init = 0;
}

#else				/* ! CONFIG_CPU_FREQ */
static int cpufreq_get_max_state(unsigned int cpu)
{
	return 0;
}

static int cpufreq_get_cur_state(unsigned int cpu)
{
	return 0;
}

static int cpufreq_set_cur_state(unsigned int cpu, int state)
{
	return 0;
}

static int acpi_thermal_cpufreq_increase(unsigned int cpu)
{
	return -ENODEV;
}
static int acpi_thermal_cpufreq_decrease(unsigned int cpu)
{
	return -ENODEV;
}

#endif

int acpi_processor_set_thermal_limit(acpi_handle handle, int type)
{
	int result = 0;
	struct acpi_processor *pr = NULL;
	struct acpi_device *device = NULL;
	int tx = 0, max_tx_px = 0;


	if ((type < ACPI_PROCESSOR_LIMIT_NONE)
	    || (type > ACPI_PROCESSOR_LIMIT_DECREMENT))
		return -EINVAL;

	result = acpi_bus_get_device(handle, &device);
	if (result)
		return result;

	pr = acpi_driver_data(device);
	if (!pr)
		return -ENODEV;

	/* Thermal limits are always relative to the current Px/Tx state. */
	if (pr->flags.throttling)
		pr->limit.thermal.tx = pr->throttling.state;

	/*
	 * Our default policy is to only use throttling at the lowest
	 * performance state.
	 */

	tx = pr->limit.thermal.tx;

	switch (type) {

	case ACPI_PROCESSOR_LIMIT_NONE:
		do {
			result = acpi_thermal_cpufreq_decrease(pr->id);
		} while (!result);
		tx = 0;
		break;

	case ACPI_PROCESSOR_LIMIT_INCREMENT:
		/* if going up: P-states first, T-states later */

		result = acpi_thermal_cpufreq_increase(pr->id);
		if (!result)
			goto end;
		else if (result == -ERANGE)
			ACPI_DEBUG_PRINT((ACPI_DB_INFO,
					  "At maximum performance state\n"));

		if (pr->flags.throttling) {
			if (tx == (pr->throttling.state_count - 1))
				ACPI_DEBUG_PRINT((ACPI_DB_INFO,
						  "At maximum throttling state\n"));
			else
				tx++;
		}
		break;

	case ACPI_PROCESSOR_LIMIT_DECREMENT:
		/* if going down: T-states first, P-states later */

		if (pr->flags.throttling) {
			if (tx == 0) {
				max_tx_px = 1;
				ACPI_DEBUG_PRINT((ACPI_DB_INFO,
						  "At minimum throttling state\n"));
			} else {
				tx--;
				goto end;
			}
		}

		result = acpi_thermal_cpufreq_decrease(pr->id);
		if (result) {
			/*
			 * We only could get -ERANGE, 1 or 0.
			 * In the first two cases we reached max freq again.
			 */
			ACPI_DEBUG_PRINT((ACPI_DB_INFO,
					  "At minimum performance state\n"));
			max_tx_px = 1;
		} else
			max_tx_px = 0;

		break;
	}

      end:
	if (pr->flags.throttling) {
		pr->limit.thermal.px = 0;
		pr->limit.thermal.tx = tx;

		result = acpi_processor_apply_limit(pr);
		if (result)
			printk(KERN_ERR PREFIX "Unable to set thermal limit\n");

		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Thermal limit now (P%d:T%d)\n",
				  pr->limit.thermal.px, pr->limit.thermal.tx));
	} else
		result = 0;
	if (max_tx_px)
		return 1;
	else
		return result;
}

int acpi_processor_get_limit_info(struct acpi_processor *pr)
{

	if (!pr)
		return -EINVAL;

	if (pr->flags.throttling)
		pr->flags.limit = 1;

	return 0;
}

/* thermal coolign device callbacks */
static int acpi_processor_max_state(struct acpi_processor *pr)
{
	int max_state = 0;

	/*
	 * There exists four states according to
	 * cpufreq_thermal_reduction_ptg. 0, 1, 2, 3
	 */
	max_state += cpufreq_get_max_state(pr->id);
	if (pr->flags.throttling)
		max_state += (pr->throttling.state_count -1);

	return max_state;
}
static int
processor_get_max_state(struct thermal_cooling_device *cdev,
			unsigned long *state)
{
	struct acpi_device *device = cdev->devdata;
	struct acpi_processor *pr = acpi_driver_data(device);

	if (!device || !pr)
		return -EINVAL;

	*state = acpi_processor_max_state(pr);
	return 0;
}

static int
processor_get_cur_state(struct thermal_cooling_device *cdev,
			unsigned long *cur_state)
{
	struct acpi_device *device = cdev->devdata;
	struct acpi_processor *pr = acpi_driver_data(device);

	if (!device || !pr)
		return -EINVAL;

	*cur_state = cpufreq_get_cur_state(pr->id);
	if (pr->flags.throttling)
		*cur_state += pr->throttling.state;
	return 0;
}

static int
processor_set_cur_state(struct thermal_cooling_device *cdev,
			unsigned long state)
{
	struct acpi_device *device = cdev->devdata;
	struct acpi_processor *pr = acpi_driver_data(device);
	int result = 0;
	int max_pstate;

	if (!device || !pr)
		return -EINVAL;

	max_pstate = cpufreq_get_max_state(pr->id);

	if (state > acpi_processor_max_state(pr))
		return -EINVAL;

	if (state <= max_pstate) {
		if (pr->flags.throttling && pr->throttling.state)
			result = acpi_processor_set_throttling(pr, 0, false);
		cpufreq_set_cur_state(pr->id, state);
	} else {
		cpufreq_set_cur_state(pr->id, max_pstate);
		result = acpi_processor_set_throttling(pr,
				state - max_pstate, false);
	}
	return result;
}

struct thermal_cooling_device_ops processor_cooling_ops = {
	.get_max_state = processor_get_max_state,
	.get_cur_state = processor_get_cur_state,
	.set_cur_state = processor_set_cur_state,
};
Commit	Line	Data
1da177e4 LT	1	/*
	2	* processor_thermal.c - Passive cooling submodule of the ACPI processor driver
	3	*
	4	* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
	5	* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
	6	* Copyright (C) 2004 Dominik Brodowski <linux@brodo.de>
	7	* Copyright (C) 2004 Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
	8	* - Added processor hotplug support
	9	*
	10	* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	11	*
	12	* This program is free software; you can redistribute it and/or modify
	13	* it under the terms of the GNU General Public License as published by
	14	* the Free Software Foundation; either version 2 of the License, or (at
	15	* your option) any later version.
	16	*
	17	* This program is distributed in the hope that it will be useful, but
	18	* WITHOUT ANY WARRANTY; without even the implied warranty of
	19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	20	* General Public License for more details.
	21	*
	22	* You should have received a copy of the GNU General Public License along
	23	* with this program; if not, write to the Free Software Foundation, Inc.,
	24	* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
	25	*
	26	* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	27	*/
	28
	29	#include <linux/kernel.h>
	30	#include <linux/module.h>
	31	#include <linux/init.h>
	32	#include <linux/cpufreq.h>
d9460fd2	33	#include <linux/sysdev.h>
1da177e4 LT	34
	35	#include <asm/uaccess.h>
	36
	37	#include <acpi/acpi_bus.h>
	38	#include <acpi/processor.h>
	39	#include <acpi/acpi_drivers.h>
	40
a192a958 LB	41	#define PREFIX "ACPI: "
a192a958 LB	42
1da177e4	43	#define ACPI_PROCESSOR_CLASS "processor"
1da177e4	44	#define _COMPONENT ACPI_PROCESSOR_COMPONENT
f52fd66d	45	ACPI_MODULE_NAME("processor_thermal");
1da177e4 LT	46
	47	/* --------------------------------------------------------------------------
	48	Limit Interface
	49	-------------------------------------------------------------------------- */
4be44fcd	50	static int acpi_processor_apply_limit(struct acpi_processor *pr)
1da177e4	51	{
4be44fcd LB	52	int result = 0;
	53	u16 px = 0;
	54	u16 tx = 0;
1da177e4	55
1da177e4 LT	56
1da177e4 LT	57	if (!pr)
d550d98d	58	return -EINVAL;
1da177e4 LT	59
1da177e4 LT	60	if (!pr->flags.limit)
d550d98d	61	return -ENODEV;
1da177e4 LT	62
	63	if (pr->flags.throttling) {
	64	if (pr->limit.user.tx > tx)
	65	tx = pr->limit.user.tx;
	66	if (pr->limit.thermal.tx > tx)
	67	tx = pr->limit.thermal.tx;
	68
2a908002	69	result = acpi_processor_set_throttling(pr, tx, false);
1da177e4 LT	70	if (result)
	71	goto end;
	72	}
	73
	74	pr->limit.state.px = px;
	75	pr->limit.state.tx = tx;
	76
4be44fcd LB	77	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
	78	"Processor [%d] limit set to (P%d:T%d)\n", pr->id,
	79	pr->limit.state.px, pr->limit.state.tx));
1da177e4	80
4be44fcd	81	end:
1da177e4	82	if (result)
6468463a	83	printk(KERN_ERR PREFIX "Unable to set limit\n");
1da177e4	84
d550d98d	85	return result;
1da177e4 LT	86	}
1da177e4 LT	87
1da177e4 LT	88	#ifdef CONFIG_CPU_FREQ
	89
	90	/* If a passive cooling situation is detected, primarily CPUfreq is used, as it
	91	* offers (in most cases) voltage scaling in addition to frequency scaling, and
	92	* thus a cubic (instead of linear) reduction of energy. Also, we allow for
	93	* _any_ cpufreq driver and not only the acpi-cpufreq driver.
	94	*/
	95
d9460fd2 ZR	96	#define CPUFREQ_THERMAL_MIN_STEP 0
	97	#define CPUFREQ_THERMAL_MAX_STEP 3
	98
c938ac21	99	static DEFINE_PER_CPU(unsigned int, cpufreq_thermal_reduction_pctg);
1da177e4 LT	100	static unsigned int acpi_thermal_cpufreq_is_init = 0;
1da177e4 LT	101
1da177e4 LT	102	static int cpu_has_cpufreq(unsigned int cpu)
	103	{
	104	struct cpufreq_policy policy;
1cbf4c56	105	if (!acpi_thermal_cpufreq_is_init \|\| cpufreq_get_policy(&policy, cpu))
75b245b3 TR	106	return 0;
75b245b3 TR	107	return 1;
1da177e4 LT	108	}
1da177e4 LT	109
1da177e4 LT	110	static int acpi_thermal_cpufreq_increase(unsigned int cpu)
	111	{
	112	if (!cpu_has_cpufreq(cpu))
	113	return -ENODEV;
	114
c938ac21	115	if (per_cpu(cpufreq_thermal_reduction_pctg, cpu) <
d9460fd2	116	CPUFREQ_THERMAL_MAX_STEP) {
c938ac21	117	per_cpu(cpufreq_thermal_reduction_pctg, cpu)++;
1da177e4 LT	118	cpufreq_update_policy(cpu);
	119	return 0;
	120	}
	121
	122	return -ERANGE;
	123	}
	124
1da177e4 LT	125	static int acpi_thermal_cpufreq_decrease(unsigned int cpu)
	126	{
	127	if (!cpu_has_cpufreq(cpu))
	128	return -ENODEV;
	129
c938ac21	130	if (per_cpu(cpufreq_thermal_reduction_pctg, cpu) >
d9460fd2	131	(CPUFREQ_THERMAL_MIN_STEP + 1))
c938ac21	132	per_cpu(cpufreq_thermal_reduction_pctg, cpu)--;
1cbf4c56	133	else
c938ac21	134	per_cpu(cpufreq_thermal_reduction_pctg, cpu) = 0;
1cbf4c56 TR	135	cpufreq_update_policy(cpu);
1cbf4c56 TR	136	/* We reached max freq again and can leave passive mode */
c938ac21	137	return !per_cpu(cpufreq_thermal_reduction_pctg, cpu);
1da177e4 LT	138	}
1da177e4 LT	139
4be44fcd LB	140	static int acpi_thermal_cpufreq_notifier(struct notifier_block *nb,
4be44fcd LB	141	unsigned long event, void *data)
1da177e4 LT	142	{
	143	struct cpufreq_policy *policy = data;
	144	unsigned long max_freq = 0;
	145
	146	if (event != CPUFREQ_ADJUST)
	147	goto out;
	148
c938ac21 MT	149	max_freq = (
	150	policy->cpuinfo.max_freq *
	151	(100 - per_cpu(cpufreq_thermal_reduction_pctg, policy->cpu) * 20)
	152	) / 100;
1da177e4 LT	153
	154	cpufreq_verify_within_limits(policy, 0, max_freq);
	155
4be44fcd	156	out:
1da177e4 LT	157	return 0;
	158	}
	159
1da177e4 LT	160	static struct notifier_block acpi_thermal_cpufreq_notifier_block = {
	161	.notifier_call = acpi_thermal_cpufreq_notifier,
	162	};
	163
d9460fd2 ZR	164	static int cpufreq_get_max_state(unsigned int cpu)
	165	{
	166	if (!cpu_has_cpufreq(cpu))
	167	return 0;
	168
	169	return CPUFREQ_THERMAL_MAX_STEP;
	170	}
	171
	172	static int cpufreq_get_cur_state(unsigned int cpu)
	173	{
	174	if (!cpu_has_cpufreq(cpu))
	175	return 0;
	176
c938ac21	177	return per_cpu(cpufreq_thermal_reduction_pctg, cpu);
d9460fd2 ZR	178	}
	179
	180	static int cpufreq_set_cur_state(unsigned int cpu, int state)
	181	{
	182	if (!cpu_has_cpufreq(cpu))
	183	return 0;
	184
c938ac21	185	per_cpu(cpufreq_thermal_reduction_pctg, cpu) = state;
d9460fd2 ZR	186	cpufreq_update_policy(cpu);
	187	return 0;
	188	}
	189
4be44fcd LB	190	void acpi_thermal_cpufreq_init(void)
4be44fcd LB	191	{
1da177e4 LT	192	int i;
1da177e4 LT	193
c938ac21 MT	194	for (i = 0; i < nr_cpu_ids; i++)
	195	if (cpu_present(i))
	196	per_cpu(cpufreq_thermal_reduction_pctg, i) = 0;
1da177e4	197
4be44fcd LB	198	i = cpufreq_register_notifier(&acpi_thermal_cpufreq_notifier_block,
4be44fcd LB	199	CPUFREQ_POLICY_NOTIFIER);
1da177e4 LT	200	if (!i)
	201	acpi_thermal_cpufreq_is_init = 1;
	202	}
	203
4be44fcd LB	204	void acpi_thermal_cpufreq_exit(void)
4be44fcd LB	205	{
1da177e4	206	if (acpi_thermal_cpufreq_is_init)
4be44fcd LB	207	cpufreq_unregister_notifier
	208	(&acpi_thermal_cpufreq_notifier_block,
	209	CPUFREQ_POLICY_NOTIFIER);
1da177e4 LT	210
	211	acpi_thermal_cpufreq_is_init = 0;
	212	}
	213
4be44fcd	214	#else /* ! CONFIG_CPU_FREQ */
d9460fd2 ZR	215	static int cpufreq_get_max_state(unsigned int cpu)
	216	{
	217	return 0;
	218	}
	219
	220	static int cpufreq_get_cur_state(unsigned int cpu)
	221	{
	222	return 0;
	223	}
	224
	225	static int cpufreq_set_cur_state(unsigned int cpu, int state)
	226	{
	227	return 0;
	228	}
1da177e4	229
4be44fcd LB	230	static int acpi_thermal_cpufreq_increase(unsigned int cpu)
	231	{
	232	return -ENODEV;
	233	}
	234	static int acpi_thermal_cpufreq_decrease(unsigned int cpu)
	235	{
	236	return -ENODEV;
	237	}
1da177e4 LT	238
	239	#endif
	240
4be44fcd	241	int acpi_processor_set_thermal_limit(acpi_handle handle, int type)
1da177e4	242	{
4be44fcd LB	243	int result = 0;
	244	struct acpi_processor *pr = NULL;
	245	struct acpi_device *device = NULL;
1cbf4c56	246	int tx = 0, max_tx_px = 0;
1da177e4	247
1da177e4 LT	248
1da177e4 LT	249	if ((type < ACPI_PROCESSOR_LIMIT_NONE)
4be44fcd	250	\|\| (type > ACPI_PROCESSOR_LIMIT_DECREMENT))
d550d98d	251	return -EINVAL;
1da177e4 LT	252
	253	result = acpi_bus_get_device(handle, &device);
	254	if (result)
d550d98d	255	return result;
1da177e4	256
50dd0969	257	pr = acpi_driver_data(device);
1da177e4	258	if (!pr)
d550d98d	259	return -ENODEV;
1da177e4 LT	260
	261	/* Thermal limits are always relative to the current Px/Tx state. */
	262	if (pr->flags.throttling)
	263	pr->limit.thermal.tx = pr->throttling.state;
	264
	265	/*
	266	* Our default policy is to only use throttling at the lowest
	267	* performance state.
	268	*/
	269
	270	tx = pr->limit.thermal.tx;
	271
	272	switch (type) {
	273
	274	case ACPI_PROCESSOR_LIMIT_NONE:
	275	do {
	276	result = acpi_thermal_cpufreq_decrease(pr->id);
	277	} while (!result);
	278	tx = 0;
	279	break;
	280
	281	case ACPI_PROCESSOR_LIMIT_INCREMENT:
	282	/* if going up: P-states first, T-states later */
	283
	284	result = acpi_thermal_cpufreq_increase(pr->id);
	285	if (!result)
	286	goto end;
	287	else if (result == -ERANGE)
	288	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
4be44fcd	289	"At maximum performance state\n"));
1da177e4 LT	290
	291	if (pr->flags.throttling) {
	292	if (tx == (pr->throttling.state_count - 1))
	293	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
4be44fcd	294	"At maximum throttling state\n"));
1da177e4 LT	295	else
	296	tx++;
	297	}
	298	break;
	299
	300	case ACPI_PROCESSOR_LIMIT_DECREMENT:
	301	/* if going down: T-states first, P-states later */
	302
	303	if (pr->flags.throttling) {
1cbf4c56 TR	304	if (tx == 0) {
1cbf4c56 TR	305	max_tx_px = 1;
1da177e4	306	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
4be44fcd	307	"At minimum throttling state\n"));
1cbf4c56	308	} else {
1da177e4 LT	309	tx--;
	310	goto end;
	311	}
	312	}
	313
	314	result = acpi_thermal_cpufreq_decrease(pr->id);
1cbf4c56 TR	315	if (result) {
	316	/*
	317	* We only could get -ERANGE, 1 or 0.
	318	* In the first two cases we reached max freq again.
	319	*/
1da177e4	320	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
4be44fcd	321	"At minimum performance state\n"));
1cbf4c56 TR	322	max_tx_px = 1;
	323	} else
	324	max_tx_px = 0;
1da177e4 LT	325
	326	break;
	327	}
	328
4be44fcd	329	end:
1da177e4 LT	330	if (pr->flags.throttling) {
	331	pr->limit.thermal.px = 0;
	332	pr->limit.thermal.tx = tx;
	333
	334	result = acpi_processor_apply_limit(pr);
	335	if (result)
6468463a	336	printk(KERN_ERR PREFIX "Unable to set thermal limit\n");
1da177e4 LT	337
1da177e4 LT	338	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Thermal limit now (P%d:T%d)\n",
4be44fcd	339	pr->limit.thermal.px, pr->limit.thermal.tx));
1da177e4 LT	340	} else
1da177e4 LT	341	result = 0;
1cbf4c56	342	if (max_tx_px)
d550d98d	343	return 1;
1cbf4c56	344	else
d550d98d	345	return result;
1da177e4 LT	346	}
1da177e4 LT	347
4be44fcd	348	int acpi_processor_get_limit_info(struct acpi_processor *pr)
1da177e4	349	{
1da177e4 LT	350
1da177e4 LT	351	if (!pr)
d550d98d	352	return -EINVAL;
1da177e4 LT	353
	354	if (pr->flags.throttling)
	355	pr->flags.limit = 1;
	356
d550d98d	357	return 0;
1da177e4 LT	358	}
1da177e4 LT	359
d9460fd2 ZR	360	/* thermal coolign device callbacks */
	361	static int acpi_processor_max_state(struct acpi_processor *pr)
	362	{
	363	int max_state = 0;
	364
	365	/*
	366	* There exists four states according to
	367	* cpufreq_thermal_reduction_ptg. 0, 1, 2, 3
	368	*/
	369	max_state += cpufreq_get_max_state(pr->id);
	370	if (pr->flags.throttling)
	371	max_state += (pr->throttling.state_count -1);
	372
	373	return max_state;
	374	}
	375	static int
6503e5df MG	376	processor_get_max_state(struct thermal_cooling_device *cdev,
6503e5df MG	377	unsigned long *state)
d9460fd2 ZR	378	{
	379	struct acpi_device *device = cdev->devdata;
	380	struct acpi_processor *pr = acpi_driver_data(device);
	381
	382	if (!device \|\| !pr)
	383	return -EINVAL;
	384
6503e5df MG	385	*state = acpi_processor_max_state(pr);
6503e5df MG	386	return 0;
d9460fd2 ZR	387	}
	388
	389	static int
6503e5df MG	390	processor_get_cur_state(struct thermal_cooling_device *cdev,
6503e5df MG	391	unsigned long *cur_state)
d9460fd2 ZR	392	{
	393	struct acpi_device *device = cdev->devdata;
	394	struct acpi_processor *pr = acpi_driver_data(device);
d9460fd2 ZR	395
	396	if (!device \|\| !pr)
	397	return -EINVAL;
	398
6503e5df	399	*cur_state = cpufreq_get_cur_state(pr->id);
d9460fd2	400	if (pr->flags.throttling)
6503e5df MG	401	*cur_state += pr->throttling.state;
6503e5df MG	402	return 0;
d9460fd2 ZR	403	}
	404
	405	static int
6503e5df MG	406	processor_set_cur_state(struct thermal_cooling_device *cdev,
6503e5df MG	407	unsigned long state)
d9460fd2 ZR	408	{
	409	struct acpi_device *device = cdev->devdata;
	410	struct acpi_processor *pr = acpi_driver_data(device);
	411	int result = 0;
	412	int max_pstate;
	413
	414	if (!device \|\| !pr)
	415	return -EINVAL;
	416
	417	max_pstate = cpufreq_get_max_state(pr->id);
	418
	419	if (state > acpi_processor_max_state(pr))
	420	return -EINVAL;
	421
	422	if (state <= max_pstate) {
	423	if (pr->flags.throttling && pr->throttling.state)
2a908002	424	result = acpi_processor_set_throttling(pr, 0, false);
d9460fd2 ZR	425	cpufreq_set_cur_state(pr->id, state);
	426	} else {
	427	cpufreq_set_cur_state(pr->id, max_pstate);
	428	result = acpi_processor_set_throttling(pr,
2a908002	429	state - max_pstate, false);
d9460fd2 ZR	430	}
	431	return result;
	432	}
	433
	434	struct thermal_cooling_device_ops processor_cooling_ops = {
	435	.get_max_state = processor_get_max_state,
	436	.get_cur_state = processor_get_cur_state,
	437	.set_cur_state = processor_set_cur_state,
	438	};