[mirror_ubuntu-hirsute-kernel.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/proc_fs.h>
#include <linux/seq_file.h>

#include <asm/uaccess.h>

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

#define ACPI_PROCESSOR_COMPONENT        0x01000000
#define ACPI_PROCESSOR_CLASS            "processor"
#define ACPI_PROCESSOR_DRIVER_NAME      "ACPI Processor Driver"
#define _COMPONENT              ACPI_PROCESSOR_COMPONENT
ACPI_MODULE_NAME("acpi_processor")

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

	ACPI_FUNCTION_TRACE("acpi_processor_apply_limit");

	if (!pr)
		return_VALUE(-EINVAL);

	if (!pr->flags.limit)
		return_VALUE(-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);
		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)
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unable to set limit\n"));

	return_VALUE(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.
 */

static unsigned int cpufreq_thermal_reduction_pctg[NR_CPUS];
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)
		return -ENODEV;
	if (!cpufreq_get_policy(&policy, cpu))
		return -ENODEV;
	return 0;
}

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

	if (cpufreq_thermal_reduction_pctg[cpu] < 60) {
		cpufreq_thermal_reduction_pctg[cpu] += 20;
		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 (cpufreq_thermal_reduction_pctg[cpu] >= 20) {
		cpufreq_thermal_reduction_pctg[cpu] -= 20;
		cpufreq_update_policy(cpu);
		return 0;
	}

	return -ERANGE;
}

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 - cpufreq_thermal_reduction_pctg[policy->cpu])) / 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,
};

void acpi_thermal_cpufreq_init(void)
{
	int i;

	for (i = 0; i < NR_CPUS; i++)
		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 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;

	ACPI_FUNCTION_TRACE("acpi_processor_set_thermal_limit");

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

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

	pr = (struct acpi_processor *)acpi_driver_data(device);
	if (!pr)
		return_VALUE(-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)
				ACPI_DEBUG_PRINT((ACPI_DB_INFO,
						  "At minimum throttling state\n"));
			else {
				tx--;
				goto end;
			}
		}

		result = acpi_thermal_cpufreq_decrease(pr->id);
		if (result == -ERANGE)
			ACPI_DEBUG_PRINT((ACPI_DB_INFO,
					  "At minimum performance state\n"));

		break;
	}

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

		result = acpi_processor_apply_limit(pr);
		if (result)
			ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
					  "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;

	return_VALUE(result);
}

int acpi_processor_get_limit_info(struct acpi_processor *pr)
{
	ACPI_FUNCTION_TRACE("acpi_processor_get_limit_info");

	if (!pr)
		return_VALUE(-EINVAL);

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

	return_VALUE(0);
}

/* /proc interface */

static int acpi_processor_limit_seq_show(struct seq_file *seq, void *offset)
{
	struct acpi_processor *pr = (struct acpi_processor *)seq->private;

	ACPI_FUNCTION_TRACE("acpi_processor_limit_seq_show");

	if (!pr)
		goto end;

	if (!pr->flags.limit) {
		seq_puts(seq, "<not supported>\n");
		goto end;
	}

	seq_printf(seq, "active limit:            P%d:T%d\n"
		   "user limit:              P%d:T%d\n"
		   "thermal limit:           P%d:T%d\n",
		   pr->limit.state.px, pr->limit.state.tx,
		   pr->limit.user.px, pr->limit.user.tx,
		   pr->limit.thermal.px, pr->limit.thermal.tx);

      end:
	return_VALUE(0);
}

static int acpi_processor_limit_open_fs(struct inode *inode, struct file *file)
{
	return single_open(file, acpi_processor_limit_seq_show,
			   PDE(inode)->data);
}

ssize_t acpi_processor_write_limit(struct file * file,
				   const char __user * buffer,
				   size_t count, loff_t * data)
{
	int result = 0;
	struct seq_file *m = (struct seq_file *)file->private_data;
	struct acpi_processor *pr = (struct acpi_processor *)m->private;
	char limit_string[25] = { '\0' };
	int px = 0;
	int tx = 0;

	ACPI_FUNCTION_TRACE("acpi_processor_write_limit");

	if (!pr || (count > sizeof(limit_string) - 1)) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid argument\n"));
		return_VALUE(-EINVAL);
	}

	if (copy_from_user(limit_string, buffer, count)) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid data\n"));
		return_VALUE(-EFAULT);
	}

	limit_string[count] = '\0';

	if (sscanf(limit_string, "%d:%d", &px, &tx) != 2) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid data format\n"));
		return_VALUE(-EINVAL);
	}

	if (pr->flags.throttling) {
		if ((tx < 0) || (tx > (pr->throttling.state_count - 1))) {
			ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid tx\n"));
			return_VALUE(-EINVAL);
		}
		pr->limit.user.tx = tx;
	}

	result = acpi_processor_apply_limit(pr);

	return_VALUE(count);
}

struct file_operations acpi_processor_limit_fops = {
	.open = acpi_processor_limit_open_fs,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
};
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>
	33	#include <linux/proc_fs.h>
	34	#include <linux/seq_file.h>
	35
	36	#include <asm/uaccess.h>
	37
	38	#include <acpi/acpi_bus.h>
	39	#include <acpi/processor.h>
	40	#include <acpi/acpi_drivers.h>
	41
	42	#define ACPI_PROCESSOR_COMPONENT 0x01000000
	43	#define ACPI_PROCESSOR_CLASS "processor"
	44	#define ACPI_PROCESSOR_DRIVER_NAME "ACPI Processor Driver"
	45	#define _COMPONENT ACPI_PROCESSOR_COMPONENT
4be44fcd	46	ACPI_MODULE_NAME("acpi_processor")
1da177e4 LT	47
	48	/* --------------------------------------------------------------------------
	49	Limit Interface
	50	-------------------------------------------------------------------------- */
4be44fcd	51	static int acpi_processor_apply_limit(struct acpi_processor *pr)
1da177e4	52	{
4be44fcd LB	53	int result = 0;
	54	u16 px = 0;
	55	u16 tx = 0;
1da177e4 LT	56
	57	ACPI_FUNCTION_TRACE("acpi_processor_apply_limit");
	58
	59	if (!pr)
	60	return_VALUE(-EINVAL);
	61
	62	if (!pr->flags.limit)
	63	return_VALUE(-ENODEV);
	64
	65	if (pr->flags.throttling) {
	66	if (pr->limit.user.tx > tx)
	67	tx = pr->limit.user.tx;
	68	if (pr->limit.thermal.tx > tx)
	69	tx = pr->limit.thermal.tx;
	70
	71	result = acpi_processor_set_throttling(pr, tx);
	72	if (result)
	73	goto end;
	74	}
	75
	76	pr->limit.state.px = px;
	77	pr->limit.state.tx = tx;
	78
4be44fcd LB	79	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
	80	"Processor [%d] limit set to (P%d:T%d)\n", pr->id,
	81	pr->limit.state.px, pr->limit.state.tx));
1da177e4	82
4be44fcd	83	end:
1da177e4 LT	84	if (result)
	85	ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unable to set limit\n"));
	86
	87	return_VALUE(result);
	88	}
	89
1da177e4 LT	90	#ifdef CONFIG_CPU_FREQ
	91
	92	/* If a passive cooling situation is detected, primarily CPUfreq is used, as it
	93	* offers (in most cases) voltage scaling in addition to frequency scaling, and
	94	* thus a cubic (instead of linear) reduction of energy. Also, we allow for
	95	* _any_ cpufreq driver and not only the acpi-cpufreq driver.
	96	*/
	97
	98	static unsigned int cpufreq_thermal_reduction_pctg[NR_CPUS];
	99	static unsigned int acpi_thermal_cpufreq_is_init = 0;
	100
1da177e4 LT	101	static int cpu_has_cpufreq(unsigned int cpu)
	102	{
	103	struct cpufreq_policy policy;
	104	if (!acpi_thermal_cpufreq_is_init)
	105	return -ENODEV;
	106	if (!cpufreq_get_policy(&policy, cpu))
	107	return -ENODEV;
	108	return 0;
	109	}
	110
1da177e4 LT	111	static int acpi_thermal_cpufreq_increase(unsigned int cpu)
	112	{
	113	if (!cpu_has_cpufreq(cpu))
	114	return -ENODEV;
	115
	116	if (cpufreq_thermal_reduction_pctg[cpu] < 60) {
	117	cpufreq_thermal_reduction_pctg[cpu] += 20;
	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
	130	if (cpufreq_thermal_reduction_pctg[cpu] >= 20) {
	131	cpufreq_thermal_reduction_pctg[cpu] -= 20;
	132	cpufreq_update_policy(cpu);
	133	return 0;
	134	}
	135
	136	return -ERANGE;
	137	}
	138
4be44fcd LB	139	static int acpi_thermal_cpufreq_notifier(struct notifier_block *nb,
4be44fcd LB	140	unsigned long event, void *data)
1da177e4 LT	141	{
	142	struct cpufreq_policy *policy = data;
	143	unsigned long max_freq = 0;
	144
	145	if (event != CPUFREQ_ADJUST)
	146	goto out;
	147
4be44fcd LB	148	max_freq =
	149	(policy->cpuinfo.max_freq *
	150	(100 - cpufreq_thermal_reduction_pctg[policy->cpu])) / 100;
1da177e4 LT	151
	152	cpufreq_verify_within_limits(policy, 0, max_freq);
	153
4be44fcd	154	out:
1da177e4 LT	155	return 0;
	156	}
	157
1da177e4 LT	158	static struct notifier_block acpi_thermal_cpufreq_notifier_block = {
	159	.notifier_call = acpi_thermal_cpufreq_notifier,
	160	};
	161
4be44fcd LB	162	void acpi_thermal_cpufreq_init(void)
4be44fcd LB	163	{
1da177e4 LT	164	int i;
1da177e4 LT	165
4be44fcd	166	for (i = 0; i < NR_CPUS; i++)
1da177e4 LT	167	cpufreq_thermal_reduction_pctg[i] = 0;
1da177e4 LT	168
4be44fcd LB	169	i = cpufreq_register_notifier(&acpi_thermal_cpufreq_notifier_block,
4be44fcd LB	170	CPUFREQ_POLICY_NOTIFIER);
1da177e4 LT	171	if (!i)
	172	acpi_thermal_cpufreq_is_init = 1;
	173	}
	174
4be44fcd LB	175	void acpi_thermal_cpufreq_exit(void)
4be44fcd LB	176	{
1da177e4	177	if (acpi_thermal_cpufreq_is_init)
4be44fcd LB	178	cpufreq_unregister_notifier
	179	(&acpi_thermal_cpufreq_notifier_block,
	180	CPUFREQ_POLICY_NOTIFIER);
1da177e4 LT	181
	182	acpi_thermal_cpufreq_is_init = 0;
	183	}
	184
4be44fcd	185	#else /* ! CONFIG_CPU_FREQ */
1da177e4	186
4be44fcd LB	187	static int acpi_thermal_cpufreq_increase(unsigned int cpu)
	188	{
	189	return -ENODEV;
	190	}
	191	static int acpi_thermal_cpufreq_decrease(unsigned int cpu)
	192	{
	193	return -ENODEV;
	194	}
1da177e4 LT	195
	196	#endif
	197
4be44fcd	198	int acpi_processor_set_thermal_limit(acpi_handle handle, int type)
1da177e4	199	{
4be44fcd LB	200	int result = 0;
	201	struct acpi_processor *pr = NULL;
	202	struct acpi_device *device = NULL;
	203	int tx = 0;
1da177e4 LT	204
	205	ACPI_FUNCTION_TRACE("acpi_processor_set_thermal_limit");
	206
	207	if ((type < ACPI_PROCESSOR_LIMIT_NONE)
4be44fcd	208	\|\| (type > ACPI_PROCESSOR_LIMIT_DECREMENT))
1da177e4 LT	209	return_VALUE(-EINVAL);
	210
	211	result = acpi_bus_get_device(handle, &device);
	212	if (result)
	213	return_VALUE(result);
	214
4be44fcd	215	pr = (struct acpi_processor *)acpi_driver_data(device);
1da177e4 LT	216	if (!pr)
	217	return_VALUE(-ENODEV);
	218
	219	/* Thermal limits are always relative to the current Px/Tx state. */
	220	if (pr->flags.throttling)
	221	pr->limit.thermal.tx = pr->throttling.state;
	222
	223	/*
	224	* Our default policy is to only use throttling at the lowest
	225	* performance state.
	226	*/
	227
	228	tx = pr->limit.thermal.tx;
	229
	230	switch (type) {
	231
	232	case ACPI_PROCESSOR_LIMIT_NONE:
	233	do {
	234	result = acpi_thermal_cpufreq_decrease(pr->id);
	235	} while (!result);
	236	tx = 0;
	237	break;
	238
	239	case ACPI_PROCESSOR_LIMIT_INCREMENT:
	240	/* if going up: P-states first, T-states later */
	241
	242	result = acpi_thermal_cpufreq_increase(pr->id);
	243	if (!result)
	244	goto end;
	245	else if (result == -ERANGE)
	246	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
4be44fcd	247	"At maximum performance state\n"));
1da177e4 LT	248
	249	if (pr->flags.throttling) {
	250	if (tx == (pr->throttling.state_count - 1))
	251	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
4be44fcd	252	"At maximum throttling state\n"));
1da177e4 LT	253	else
	254	tx++;
	255	}
	256	break;
	257
	258	case ACPI_PROCESSOR_LIMIT_DECREMENT:
	259	/* if going down: T-states first, P-states later */
	260
	261	if (pr->flags.throttling) {
	262	if (tx == 0)
	263	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
4be44fcd	264	"At minimum throttling state\n"));
1da177e4 LT	265	else {
	266	tx--;
	267	goto end;
	268	}
	269	}
	270
	271	result = acpi_thermal_cpufreq_decrease(pr->id);
	272	if (result == -ERANGE)
	273	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
4be44fcd	274	"At minimum performance state\n"));
1da177e4 LT	275
	276	break;
	277	}
	278
4be44fcd	279	end:
1da177e4 LT	280	if (pr->flags.throttling) {
	281	pr->limit.thermal.px = 0;
	282	pr->limit.thermal.tx = tx;
	283
	284	result = acpi_processor_apply_limit(pr);
	285	if (result)
	286	ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
	287	"Unable to set thermal limit\n"));
	288
	289	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Thermal limit now (P%d:T%d)\n",
4be44fcd	290	pr->limit.thermal.px, pr->limit.thermal.tx));
1da177e4 LT	291	} else
	292	result = 0;
	293
	294	return_VALUE(result);
	295	}
	296
4be44fcd	297	int acpi_processor_get_limit_info(struct acpi_processor *pr)
1da177e4 LT	298	{
	299	ACPI_FUNCTION_TRACE("acpi_processor_get_limit_info");
	300
	301	if (!pr)
	302	return_VALUE(-EINVAL);
	303
	304	if (pr->flags.throttling)
	305	pr->flags.limit = 1;
	306
	307	return_VALUE(0);
	308	}
	309
1da177e4 LT	310	/* /proc interface */
	311
	312	static int acpi_processor_limit_seq_show(struct seq_file seq, void offset)
	313	{
4be44fcd	314	struct acpi_processor pr = (struct acpi_processor )seq->private;
1da177e4 LT	315
	316	ACPI_FUNCTION_TRACE("acpi_processor_limit_seq_show");
	317
	318	if (!pr)
	319	goto end;
	320
	321	if (!pr->flags.limit) {
	322	seq_puts(seq, "<not supported>\n");
	323	goto end;
	324	}
	325
	326	seq_printf(seq, "active limit: P%d:T%d\n"
4be44fcd LB	327	"user limit: P%d:T%d\n"
	328	"thermal limit: P%d:T%d\n",
	329	pr->limit.state.px, pr->limit.state.tx,
	330	pr->limit.user.px, pr->limit.user.tx,
	331	pr->limit.thermal.px, pr->limit.thermal.tx);
1da177e4	332
4be44fcd	333	end:
1da177e4 LT	334	return_VALUE(0);
	335	}
	336
	337	static int acpi_processor_limit_open_fs(struct inode inode, struct file file)
	338	{
	339	return single_open(file, acpi_processor_limit_seq_show,
4be44fcd	340	PDE(inode)->data);
1da177e4 LT	341	}
1da177e4 LT	342
4be44fcd LB	343	ssize_t acpi_processor_write_limit(struct file * file,
	344	const char __user * buffer,
	345	size_t count, loff_t * data)
1da177e4	346	{
4be44fcd LB	347	int result = 0;
	348	struct seq_file m = (struct seq_file )file->private_data;
	349	struct acpi_processor pr = (struct acpi_processor )m->private;
	350	char limit_string[25] = { '\0' };
	351	int px = 0;
	352	int tx = 0;
1da177e4 LT	353
	354	ACPI_FUNCTION_TRACE("acpi_processor_write_limit");
	355
	356	if (!pr \|\| (count > sizeof(limit_string) - 1)) {
	357	ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid argument\n"));
	358	return_VALUE(-EINVAL);
	359	}
	360
	361	if (copy_from_user(limit_string, buffer, count)) {
	362	ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid data\n"));
	363	return_VALUE(-EFAULT);
	364	}
	365
	366	limit_string[count] = '\0';
	367
	368	if (sscanf(limit_string, "%d:%d", &px, &tx) != 2) {
	369	ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid data format\n"));
	370	return_VALUE(-EINVAL);
	371	}
	372
	373	if (pr->flags.throttling) {
	374	if ((tx < 0) \|\| (tx > (pr->throttling.state_count - 1))) {
	375	ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid tx\n"));
	376	return_VALUE(-EINVAL);
	377	}
	378	pr->limit.user.tx = tx;
	379	}
	380
	381	result = acpi_processor_apply_limit(pr);
	382
	383	return_VALUE(count);
	384	}
	385
1da177e4	386	struct file_operations acpi_processor_limit_fops = {
4be44fcd LB	387	.open = acpi_processor_limit_open_fs,
	388	.read = seq_read,
	389	.llseek = seq_lseek,
	390	.release = single_release,
1da177e4	391	};