[linux-2.6-block.git] / drivers / acpi / processor_perflib.c

/*
 * processor_perflib.c - ACPI Processor P-States Library ($Revision: 71 $)
 *
 *  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>

#ifdef CONFIG_X86_ACPI_CPUFREQ_PROC_INTF
#include <linux/proc_fs.h>
#include <linux/seq_file.h>

#include <asm/uaccess.h>
#endif

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

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

static DECLARE_MUTEX(performance_sem);

/*
 * _PPC support is implemented as a CPUfreq policy notifier:
 * This means each time a CPUfreq driver registered also with
 * the ACPI core is asked to change the speed policy, the maximum
 * value is adjusted so that it is within the platform limit.
 *
 * Also, when a new platform limit value is detected, the CPUfreq
 * policy is adjusted accordingly.
 */

#define PPC_REGISTERED   1
#define PPC_IN_USE       2

static int acpi_processor_ppc_status = 0;

static int acpi_processor_ppc_notifier(struct notifier_block *nb,
				       unsigned long event, void *data)
{
	struct cpufreq_policy *policy = data;
	struct acpi_processor *pr;
	unsigned int ppc = 0;

	down(&performance_sem);

	if (event != CPUFREQ_INCOMPATIBLE)
		goto out;

	pr = processors[policy->cpu];
	if (!pr || !pr->performance)
		goto out;

	ppc = (unsigned int)pr->performance_platform_limit;
	if (!ppc)
		goto out;

	if (ppc > pr->performance->state_count)
		goto out;

	cpufreq_verify_within_limits(policy, 0,
				     pr->performance->states[ppc].
				     core_frequency * 1000);

      out:
	up(&performance_sem);

	return 0;
}

static struct notifier_block acpi_ppc_notifier_block = {
	.notifier_call = acpi_processor_ppc_notifier,
};

static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
{
	acpi_status status = 0;
	unsigned long ppc = 0;

	ACPI_FUNCTION_TRACE("acpi_processor_get_platform_limit");

	if (!pr)
		return_VALUE(-EINVAL);

	/*
	 * _PPC indicates the maximum state currently supported by the platform
	 * (e.g. 0 = states 0..n; 1 = states 1..n; etc.
	 */
	status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc);

	if (status != AE_NOT_FOUND)
		acpi_processor_ppc_status |= PPC_IN_USE;

	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PPC\n"));
		return_VALUE(-ENODEV);
	}

	pr->performance_platform_limit = (int)ppc;

	return_VALUE(0);
}

int acpi_processor_ppc_has_changed(struct acpi_processor *pr)
{
	int ret = acpi_processor_get_platform_limit(pr);
	if (ret < 0)
		return (ret);
	else
		return cpufreq_update_policy(pr->id);
}

void acpi_processor_ppc_init(void)
{
	if (!cpufreq_register_notifier
	    (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER))
		acpi_processor_ppc_status |= PPC_REGISTERED;
	else
		printk(KERN_DEBUG
		       "Warning: Processor Platform Limit not supported.\n");
}

void acpi_processor_ppc_exit(void)
{
	if (acpi_processor_ppc_status & PPC_REGISTERED)
		cpufreq_unregister_notifier(&acpi_ppc_notifier_block,
					    CPUFREQ_POLICY_NOTIFIER);

	acpi_processor_ppc_status &= ~PPC_REGISTERED;
}

static int acpi_processor_get_performance_control(struct acpi_processor *pr)
{
	int result = 0;
	acpi_status status = 0;
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	union acpi_object *pct = NULL;
	union acpi_object obj = { 0 };

	ACPI_FUNCTION_TRACE("acpi_processor_get_performance_control");

	status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
	if (ACPI_FAILURE(status)) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PCT\n"));
		return_VALUE(-ENODEV);
	}

	pct = (union acpi_object *)buffer.pointer;
	if (!pct || (pct->type != ACPI_TYPE_PACKAGE)
	    || (pct->package.count != 2)) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PCT data\n"));
		result = -EFAULT;
		goto end;
	}

	/*
	 * control_register
	 */

	obj = pct->package.elements[0];

	if ((obj.type != ACPI_TYPE_BUFFER)
	    || (obj.buffer.length < sizeof(struct acpi_pct_register))
	    || (obj.buffer.pointer == NULL)) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
				  "Invalid _PCT data (control_register)\n"));
		result = -EFAULT;
		goto end;
	}
	memcpy(&pr->performance->control_register, obj.buffer.pointer,
	       sizeof(struct acpi_pct_register));

	/*
	 * status_register
	 */

	obj = pct->package.elements[1];

	if ((obj.type != ACPI_TYPE_BUFFER)
	    || (obj.buffer.length < sizeof(struct acpi_pct_register))
	    || (obj.buffer.pointer == NULL)) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
				  "Invalid _PCT data (status_register)\n"));
		result = -EFAULT;
		goto end;
	}

	memcpy(&pr->performance->status_register, obj.buffer.pointer,
	       sizeof(struct acpi_pct_register));

      end:
	acpi_os_free(buffer.pointer);

	return_VALUE(result);
}

static int acpi_processor_get_performance_states(struct acpi_processor *pr)
{
	int result = 0;
	acpi_status status = AE_OK;
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
	struct acpi_buffer state = { 0, NULL };
	union acpi_object *pss = NULL;
	int i;

	ACPI_FUNCTION_TRACE("acpi_processor_get_performance_states");

	status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
	if (ACPI_FAILURE(status)) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PSS\n"));
		return_VALUE(-ENODEV);
	}

	pss = (union acpi_object *)buffer.pointer;
	if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSS data\n"));
		result = -EFAULT;
		goto end;
	}

	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n",
			  pss->package.count));

	pr->performance->state_count = pss->package.count;
	pr->performance->states =
	    kmalloc(sizeof(struct acpi_processor_px) * pss->package.count,
		    GFP_KERNEL);
	if (!pr->performance->states) {
		result = -ENOMEM;
		goto end;
	}

	for (i = 0; i < pr->performance->state_count; i++) {

		struct acpi_processor_px *px = &(pr->performance->states[i]);

		state.length = sizeof(struct acpi_processor_px);
		state.pointer = px;

		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));

		status = acpi_extract_package(&(pss->package.elements[i]),
					      &format, &state);
		if (ACPI_FAILURE(status)) {
			ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
					  "Invalid _PSS data\n"));
			result = -EFAULT;
			kfree(pr->performance->states);
			goto end;
		}

		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
				  "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
				  i,
				  (u32) px->core_frequency,
				  (u32) px->power,
				  (u32) px->transition_latency,
				  (u32) px->bus_master_latency,
				  (u32) px->control, (u32) px->status));

		if (!px->core_frequency) {
			ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
					  "Invalid _PSS data: freq is zero\n"));
			result = -EFAULT;
			kfree(pr->performance->states);
			goto end;
		}
	}

      end:
	acpi_os_free(buffer.pointer);

	return_VALUE(result);
}

static int acpi_processor_get_performance_info(struct acpi_processor *pr)
{
	int result = 0;
	acpi_status status = AE_OK;
	acpi_handle handle = NULL;

	ACPI_FUNCTION_TRACE("acpi_processor_get_performance_info");

	if (!pr || !pr->performance || !pr->handle)
		return_VALUE(-EINVAL);

	status = acpi_get_handle(pr->handle, "_PCT", &handle);
	if (ACPI_FAILURE(status)) {
		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
				  "ACPI-based processor performance control unavailable\n"));
		return_VALUE(-ENODEV);
	}

	result = acpi_processor_get_performance_control(pr);
	if (result)
		return_VALUE(result);

	result = acpi_processor_get_performance_states(pr);
	if (result)
		return_VALUE(result);

	result = acpi_processor_get_platform_limit(pr);
	if (result)
		return_VALUE(result);

	return_VALUE(0);
}

int acpi_processor_notify_smm(struct module *calling_module)
{
	acpi_status status;
	static int is_done = 0;

	ACPI_FUNCTION_TRACE("acpi_processor_notify_smm");

	if (!(acpi_processor_ppc_status & PPC_REGISTERED))
		return_VALUE(-EBUSY);

	if (!try_module_get(calling_module))
		return_VALUE(-EINVAL);

	/* is_done is set to negative if an error occured,
	 * and to postitive if _no_ error occured, but SMM
	 * was already notified. This avoids double notification
	 * which might lead to unexpected results...
	 */
	if (is_done > 0) {
		module_put(calling_module);
		return_VALUE(0);
	} else if (is_done < 0) {
		module_put(calling_module);
		return_VALUE(is_done);
	}

	is_done = -EIO;

	/* Can't write pstate_cnt to smi_cmd if either value is zero */
	if ((!acpi_fadt.smi_cmd) || (!acpi_fadt.pstate_cnt)) {
		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_cnt\n"));
		module_put(calling_module);
		return_VALUE(0);
	}

	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
			  "Writing pstate_cnt [0x%x] to smi_cmd [0x%x]\n",
			  acpi_fadt.pstate_cnt, acpi_fadt.smi_cmd));

	/* FADT v1 doesn't support pstate_cnt, many BIOS vendors use
	 * it anyway, so we need to support it... */
	if (acpi_fadt_is_v1) {
		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
				  "Using v1.0 FADT reserved value for pstate_cnt\n"));
	}

	status = acpi_os_write_port(acpi_fadt.smi_cmd,
				    (u32) acpi_fadt.pstate_cnt, 8);
	if (ACPI_FAILURE(status)) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
				  "Failed to write pstate_cnt [0x%x] to "
				  "smi_cmd [0x%x]\n", acpi_fadt.pstate_cnt,
				  acpi_fadt.smi_cmd));
		module_put(calling_module);
		return_VALUE(status);
	}

	/* Success. If there's no _PPC, we need to fear nothing, so
	 * we can allow the cpufreq driver to be rmmod'ed. */
	is_done = 1;

	if (!(acpi_processor_ppc_status & PPC_IN_USE))
		module_put(calling_module);

	return_VALUE(0);
}

EXPORT_SYMBOL(acpi_processor_notify_smm);

#ifdef CONFIG_X86_ACPI_CPUFREQ_PROC_INTF
/* /proc/acpi/processor/../performance interface (DEPRECATED) */

static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file);
static struct file_operations acpi_processor_perf_fops = {
	.open = acpi_processor_perf_open_fs,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
};

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

	ACPI_FUNCTION_TRACE("acpi_processor_perf_seq_show");

	if (!pr)
		goto end;

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

	seq_printf(seq, "state count:             %d\n"
		   "active state:            P%d\n",
		   pr->performance->state_count, pr->performance->state);

	seq_puts(seq, "states:\n");
	for (i = 0; i < pr->performance->state_count; i++)
		seq_printf(seq,
			   "   %cP%d:                  %d MHz, %d mW, %d uS\n",
			   (i == pr->performance->state ? '*' : ' '), i,
			   (u32) pr->performance->states[i].core_frequency,
			   (u32) pr->performance->states[i].power,
			   (u32) pr->performance->states[i].transition_latency);

      end:
	return_VALUE(0);
}

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

static ssize_t
acpi_processor_write_performance(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;
	struct acpi_processor_performance *perf;
	char state_string[12] = { '\0' };
	unsigned int new_state = 0;
	struct cpufreq_policy policy;

	ACPI_FUNCTION_TRACE("acpi_processor_write_performance");

	if (!pr || (count > sizeof(state_string) - 1))
		return_VALUE(-EINVAL);

	perf = pr->performance;
	if (!perf)
		return_VALUE(-EINVAL);

	if (copy_from_user(state_string, buffer, count))
		return_VALUE(-EFAULT);

	state_string[count] = '\0';
	new_state = simple_strtoul(state_string, NULL, 0);

	if (new_state >= perf->state_count)
		return_VALUE(-EINVAL);

	cpufreq_get_policy(&policy, pr->id);

	policy.cpu = pr->id;
	policy.min = perf->states[new_state].core_frequency * 1000;
	policy.max = perf->states[new_state].core_frequency * 1000;

	result = cpufreq_set_policy(&policy);
	if (result)
		return_VALUE(result);

	return_VALUE(count);
}

static void acpi_cpufreq_add_file(struct acpi_processor *pr)
{
	struct proc_dir_entry *entry = NULL;
	struct acpi_device *device = NULL;

	ACPI_FUNCTION_TRACE("acpi_cpufreq_addfile");

	if (acpi_bus_get_device(pr->handle, &device))
		return_VOID;

	/* add file 'performance' [R/W] */
	entry = create_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE,
				  S_IFREG | S_IRUGO | S_IWUSR,
				  acpi_device_dir(device));
	if (!entry)
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
				  "Unable to create '%s' fs entry\n",
				  ACPI_PROCESSOR_FILE_PERFORMANCE));
	else {
		acpi_processor_perf_fops.write = acpi_processor_write_performance;
		entry->proc_fops = &acpi_processor_perf_fops;
		entry->data = acpi_driver_data(device);
		entry->owner = THIS_MODULE;
	}
	return_VOID;
}

static void acpi_cpufreq_remove_file(struct acpi_processor *pr)
{
	struct acpi_device *device = NULL;

	ACPI_FUNCTION_TRACE("acpi_cpufreq_addfile");

	if (acpi_bus_get_device(pr->handle, &device))
		return_VOID;

	/* remove file 'performance' */
	remove_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE,
			  acpi_device_dir(device));

	return_VOID;
}

#else
static void acpi_cpufreq_add_file(struct acpi_processor *pr)
{
	return;
}
static void acpi_cpufreq_remove_file(struct acpi_processor *pr)
{
	return;
}
#endif				/* CONFIG_X86_ACPI_CPUFREQ_PROC_INTF */

int
acpi_processor_register_performance(struct acpi_processor_performance
				    *performance, unsigned int cpu)
{
	struct acpi_processor *pr;

	ACPI_FUNCTION_TRACE("acpi_processor_register_performance");

	if (!(acpi_processor_ppc_status & PPC_REGISTERED))
		return_VALUE(-EINVAL);

	down(&performance_sem);

	pr = processors[cpu];
	if (!pr) {
		up(&performance_sem);
		return_VALUE(-ENODEV);
	}

	if (pr->performance) {
		up(&performance_sem);
		return_VALUE(-EBUSY);
	}

	pr->performance = performance;

	if (acpi_processor_get_performance_info(pr)) {
		pr->performance = NULL;
		up(&performance_sem);
		return_VALUE(-EIO);
	}

	acpi_cpufreq_add_file(pr);

	up(&performance_sem);
	return_VALUE(0);
}

EXPORT_SYMBOL(acpi_processor_register_performance);

void
acpi_processor_unregister_performance(struct acpi_processor_performance
				      *performance, unsigned int cpu)
{
	struct acpi_processor *pr;

	ACPI_FUNCTION_TRACE("acpi_processor_unregister_performance");

	down(&performance_sem);

	pr = processors[cpu];
	if (!pr) {
		up(&performance_sem);
		return_VOID;
	}

	kfree(pr->performance->states);
	pr->performance = NULL;

	acpi_cpufreq_remove_file(pr);

	up(&performance_sem);

	return_VOID;
}

EXPORT_SYMBOL(acpi_processor_unregister_performance);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* processor_perflib.c - ACPI Processor P-States Library ($Revision: 71 $)
	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	*
	13	* This program is free software; you can redistribute it and/or modify
	14	* it under the terms of the GNU General Public License as published by
	15	* the Free Software Foundation; either version 2 of the License, or (at
	16	* your option) any later version.
	17	*
	18	* This program is distributed in the hope that it will be useful, but
	19	* WITHOUT ANY WARRANTY; without even the implied warranty of
	20	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	21	* General Public License for more details.
	22	*
	23	* You should have received a copy of the GNU General Public License along
	24	* with this program; if not, write to the Free Software Foundation, Inc.,
	25	* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
	26	*
	27	*/
	28
1da177e4 LT	29	#include <linux/kernel.h>
	30	#include <linux/module.h>
	31	#include <linux/init.h>
	32	#include <linux/cpufreq.h>
	33
	34	#ifdef CONFIG_X86_ACPI_CPUFREQ_PROC_INTF
	35	#include <linux/proc_fs.h>
	36	#include <linux/seq_file.h>
	37
	38	#include <asm/uaccess.h>
	39	#endif
	40
	41	#include <acpi/acpi_bus.h>
	42	#include <acpi/processor.h>
	43
1da177e4 LT	44	#define ACPI_PROCESSOR_COMPONENT 0x01000000
	45	#define ACPI_PROCESSOR_CLASS "processor"
	46	#define ACPI_PROCESSOR_DRIVER_NAME "ACPI Processor Driver"
	47	#define ACPI_PROCESSOR_FILE_PERFORMANCE "performance"
	48	#define _COMPONENT ACPI_PROCESSOR_COMPONENT
4be44fcd	49	ACPI_MODULE_NAME("acpi_processor")
1da177e4 LT	50
	51	static DECLARE_MUTEX(performance_sem);
	52
	53	/*
	54	* _PPC support is implemented as a CPUfreq policy notifier:
	55	* This means each time a CPUfreq driver registered also with
	56	* the ACPI core is asked to change the speed policy, the maximum
	57	* value is adjusted so that it is within the platform limit.
	58	*
	59	* Also, when a new platform limit value is detected, the CPUfreq
	60	* policy is adjusted accordingly.
	61	*/
	62
	63	#define PPC_REGISTERED 1
	64	#define PPC_IN_USE 2
	65
	66	static int acpi_processor_ppc_status = 0;
	67
	68	static int acpi_processor_ppc_notifier(struct notifier_block *nb,
4be44fcd	69	unsigned long event, void *data)
1da177e4 LT	70	{
	71	struct cpufreq_policy *policy = data;
	72	struct acpi_processor *pr;
	73	unsigned int ppc = 0;
	74
	75	down(&performance_sem);
	76
	77	if (event != CPUFREQ_INCOMPATIBLE)
	78	goto out;
	79
	80	pr = processors[policy->cpu];
	81	if (!pr \|\| !pr->performance)
	82	goto out;
	83
4be44fcd	84	ppc = (unsigned int)pr->performance_platform_limit;
1da177e4 LT	85	if (!ppc)
	86	goto out;
	87
	88	if (ppc > pr->performance->state_count)
	89	goto out;
	90
	91	cpufreq_verify_within_limits(policy, 0,
4be44fcd LB	92	pr->performance->states[ppc].
4be44fcd LB	93	core_frequency * 1000);
1da177e4	94
4be44fcd	95	out:
1da177e4 LT	96	up(&performance_sem);
	97
	98	return 0;
	99	}
	100
1da177e4 LT	101	static struct notifier_block acpi_ppc_notifier_block = {
	102	.notifier_call = acpi_processor_ppc_notifier,
	103	};
	104
4be44fcd	105	static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
1da177e4	106	{
4be44fcd LB	107	acpi_status status = 0;
4be44fcd LB	108	unsigned long ppc = 0;
1da177e4 LT	109
	110	ACPI_FUNCTION_TRACE("acpi_processor_get_platform_limit");
	111
	112	if (!pr)
	113	return_VALUE(-EINVAL);
	114
	115	/*
	116	* _PPC indicates the maximum state currently supported by the platform
	117	* (e.g. 0 = states 0..n; 1 = states 1..n; etc.
	118	*/
	119	status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc);
	120
	121	if (status != AE_NOT_FOUND)
	122	acpi_processor_ppc_status \|= PPC_IN_USE;
	123
4be44fcd	124	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
1da177e4 LT	125	ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PPC\n"));
	126	return_VALUE(-ENODEV);
	127	}
	128
4be44fcd	129	pr->performance_platform_limit = (int)ppc;
1da177e4 LT	130
	131	return_VALUE(0);
	132	}
	133
4be44fcd	134	int acpi_processor_ppc_has_changed(struct acpi_processor *pr)
1da177e4 LT	135	{
	136	int ret = acpi_processor_get_platform_limit(pr);
	137	if (ret < 0)
	138	return (ret);
	139	else
	140	return cpufreq_update_policy(pr->id);
	141	}
	142
4be44fcd LB	143	void acpi_processor_ppc_init(void)
	144	{
	145	if (!cpufreq_register_notifier
	146	(&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER))
1da177e4 LT	147	acpi_processor_ppc_status \|= PPC_REGISTERED;
1da177e4 LT	148	else
4be44fcd LB	149	printk(KERN_DEBUG
4be44fcd LB	150	"Warning: Processor Platform Limit not supported.\n");
1da177e4 LT	151	}
1da177e4 LT	152
4be44fcd LB	153	void acpi_processor_ppc_exit(void)
4be44fcd LB	154	{
1da177e4	155	if (acpi_processor_ppc_status & PPC_REGISTERED)
4be44fcd LB	156	cpufreq_unregister_notifier(&acpi_ppc_notifier_block,
4be44fcd LB	157	CPUFREQ_POLICY_NOTIFIER);
1da177e4 LT	158
	159	acpi_processor_ppc_status &= ~PPC_REGISTERED;
	160	}
	161
4be44fcd	162	static int acpi_processor_get_performance_control(struct acpi_processor *pr)
1da177e4	163	{
4be44fcd LB	164	int result = 0;
	165	acpi_status status = 0;
	166	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	167	union acpi_object *pct = NULL;
	168	union acpi_object obj = { 0 };
1da177e4 LT	169
	170	ACPI_FUNCTION_TRACE("acpi_processor_get_performance_control");
	171
	172	status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
4be44fcd	173	if (ACPI_FAILURE(status)) {
1da177e4 LT	174	ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PCT\n"));
	175	return_VALUE(-ENODEV);
	176	}
	177
4be44fcd	178	pct = (union acpi_object *)buffer.pointer;
1da177e4	179	if (!pct \|\| (pct->type != ACPI_TYPE_PACKAGE)
4be44fcd	180	\|\| (pct->package.count != 2)) {
1da177e4 LT	181	ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PCT data\n"));
	182	result = -EFAULT;
	183	goto end;
	184	}
	185
	186	/*
	187	* control_register
	188	*/
	189
	190	obj = pct->package.elements[0];
	191
	192	if ((obj.type != ACPI_TYPE_BUFFER)
4be44fcd LB	193	\|\| (obj.buffer.length < sizeof(struct acpi_pct_register))
4be44fcd LB	194	\|\| (obj.buffer.pointer == NULL)) {
1da177e4	195	ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
4be44fcd	196	"Invalid _PCT data (control_register)\n"));
1da177e4 LT	197	result = -EFAULT;
	198	goto end;
	199	}
4be44fcd LB	200	memcpy(&pr->performance->control_register, obj.buffer.pointer,
4be44fcd LB	201	sizeof(struct acpi_pct_register));
1da177e4 LT	202
	203	/*
	204	* status_register
	205	*/
	206
	207	obj = pct->package.elements[1];
	208
	209	if ((obj.type != ACPI_TYPE_BUFFER)
4be44fcd LB	210	\|\| (obj.buffer.length < sizeof(struct acpi_pct_register))
4be44fcd LB	211	\|\| (obj.buffer.pointer == NULL)) {
1da177e4	212	ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
4be44fcd	213	"Invalid _PCT data (status_register)\n"));
1da177e4 LT	214	result = -EFAULT;
	215	goto end;
	216	}
	217
4be44fcd LB	218	memcpy(&pr->performance->status_register, obj.buffer.pointer,
4be44fcd LB	219	sizeof(struct acpi_pct_register));
1da177e4	220
4be44fcd	221	end:
1da177e4 LT	222	acpi_os_free(buffer.pointer);
	223
	224	return_VALUE(result);
	225	}
	226
4be44fcd	227	static int acpi_processor_get_performance_states(struct acpi_processor *pr)
1da177e4	228	{
4be44fcd LB	229	int result = 0;
	230	acpi_status status = AE_OK;
	231	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	232	struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
	233	struct acpi_buffer state = { 0, NULL };
	234	union acpi_object *pss = NULL;
	235	int i;
1da177e4 LT	236
	237	ACPI_FUNCTION_TRACE("acpi_processor_get_performance_states");
	238
	239	status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
4be44fcd	240	if (ACPI_FAILURE(status)) {
1da177e4 LT	241	ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PSS\n"));
	242	return_VALUE(-ENODEV);
	243	}
	244
4be44fcd	245	pss = (union acpi_object *)buffer.pointer;
1da177e4 LT	246	if (!pss \|\| (pss->type != ACPI_TYPE_PACKAGE)) {
	247	ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSS data\n"));
	248	result = -EFAULT;
	249	goto end;
	250	}
	251
	252	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n",
4be44fcd	253	pss->package.count));
1da177e4 LT	254
1da177e4 LT	255	pr->performance->state_count = pss->package.count;
4be44fcd LB	256	pr->performance->states =
	257	kmalloc(sizeof(struct acpi_processor_px) * pss->package.count,
	258	GFP_KERNEL);
1da177e4 LT	259	if (!pr->performance->states) {
	260	result = -ENOMEM;
	261	goto end;
	262	}
	263
	264	for (i = 0; i < pr->performance->state_count; i++) {
	265
	266	struct acpi_processor_px *px = &(pr->performance->states[i]);
	267
	268	state.length = sizeof(struct acpi_processor_px);
	269	state.pointer = px;
	270
	271	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
	272
	273	status = acpi_extract_package(&(pss->package.elements[i]),
4be44fcd	274	&format, &state);
1da177e4	275	if (ACPI_FAILURE(status)) {
4be44fcd LB	276	ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
4be44fcd LB	277	"Invalid _PSS data\n"));
1da177e4 LT	278	result = -EFAULT;
	279	kfree(pr->performance->states);
	280	goto end;
	281	}
	282
	283	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
4be44fcd LB	284	"State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
	285	i,
	286	(u32) px->core_frequency,
	287	(u32) px->power,
	288	(u32) px->transition_latency,
	289	(u32) px->bus_master_latency,
	290	(u32) px->control, (u32) px->status));
1da177e4 LT	291
1da177e4 LT	292	if (!px->core_frequency) {
4be44fcd LB	293	ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
4be44fcd LB	294	"Invalid _PSS data: freq is zero\n"));
1da177e4 LT	295	result = -EFAULT;
	296	kfree(pr->performance->states);
	297	goto end;
	298	}
	299	}
	300
4be44fcd	301	end:
1da177e4 LT	302	acpi_os_free(buffer.pointer);
	303
	304	return_VALUE(result);
	305	}
	306
4be44fcd	307	static int acpi_processor_get_performance_info(struct acpi_processor *pr)
1da177e4	308	{
4be44fcd LB	309	int result = 0;
	310	acpi_status status = AE_OK;
	311	acpi_handle handle = NULL;
1da177e4 LT	312
	313	ACPI_FUNCTION_TRACE("acpi_processor_get_performance_info");
	314
	315	if (!pr \|\| !pr->performance \|\| !pr->handle)
	316	return_VALUE(-EINVAL);
	317
1da177e4 LT	318	status = acpi_get_handle(pr->handle, "_PCT", &handle);
	319	if (ACPI_FAILURE(status)) {
	320	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
4be44fcd	321	"ACPI-based processor performance control unavailable\n"));
1da177e4 LT	322	return_VALUE(-ENODEV);
	323	}
	324
	325	result = acpi_processor_get_performance_control(pr);
	326	if (result)
	327	return_VALUE(result);
	328
	329	result = acpi_processor_get_performance_states(pr);
	330	if (result)
	331	return_VALUE(result);
	332
	333	result = acpi_processor_get_platform_limit(pr);
	334	if (result)
	335	return_VALUE(result);
	336
	337	return_VALUE(0);
	338	}
	339
4be44fcd LB	340	int acpi_processor_notify_smm(struct module *calling_module)
	341	{
	342	acpi_status status;
	343	static int is_done = 0;
1da177e4 LT	344
	345	ACPI_FUNCTION_TRACE("acpi_processor_notify_smm");
	346
	347	if (!(acpi_processor_ppc_status & PPC_REGISTERED))
	348	return_VALUE(-EBUSY);
	349
	350	if (!try_module_get(calling_module))
	351	return_VALUE(-EINVAL);
	352
	353	/* is_done is set to negative if an error occured,
	354	* and to postitive if _no_ error occured, but SMM
	355	* was already notified. This avoids double notification
	356	* which might lead to unexpected results...
	357	*/
	358	if (is_done > 0) {
	359	module_put(calling_module);
	360	return_VALUE(0);
4be44fcd	361	} else if (is_done < 0) {
1da177e4 LT	362	module_put(calling_module);
	363	return_VALUE(is_done);
	364	}
	365
	366	is_done = -EIO;
	367
	368	/* Can't write pstate_cnt to smi_cmd if either value is zero */
4be44fcd LB	369	if ((!acpi_fadt.smi_cmd) \|\| (!acpi_fadt.pstate_cnt)) {
4be44fcd LB	370	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_cnt\n"));
1da177e4 LT	371	module_put(calling_module);
	372	return_VALUE(0);
	373	}
	374
4be44fcd LB	375	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
	376	"Writing pstate_cnt [0x%x] to smi_cmd [0x%x]\n",
	377	acpi_fadt.pstate_cnt, acpi_fadt.smi_cmd));
1da177e4 LT	378
	379	/* FADT v1 doesn't support pstate_cnt, many BIOS vendors use
	380	* it anyway, so we need to support it... */
	381	if (acpi_fadt_is_v1) {
4be44fcd LB	382	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
4be44fcd LB	383	"Using v1.0 FADT reserved value for pstate_cnt\n"));
1da177e4 LT	384	}
1da177e4 LT	385
4be44fcd LB	386	status = acpi_os_write_port(acpi_fadt.smi_cmd,
	387	(u32) acpi_fadt.pstate_cnt, 8);
	388	if (ACPI_FAILURE(status)) {
1da177e4 LT	389	ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1da177e4 LT	390	"Failed to write pstate_cnt [0x%x] to "
4be44fcd LB	391	"smi_cmd [0x%x]\n", acpi_fadt.pstate_cnt,
4be44fcd LB	392	acpi_fadt.smi_cmd));
1da177e4 LT	393	module_put(calling_module);
	394	return_VALUE(status);
	395	}
	396
	397	/* Success. If there's no _PPC, we need to fear nothing, so
	398	* we can allow the cpufreq driver to be rmmod'ed. */
	399	is_done = 1;
	400
	401	if (!(acpi_processor_ppc_status & PPC_IN_USE))
	402	module_put(calling_module);
	403
	404	return_VALUE(0);
	405	}
1da177e4	406
4be44fcd	407	EXPORT_SYMBOL(acpi_processor_notify_smm);
1da177e4 LT	408
	409	#ifdef CONFIG_X86_ACPI_CPUFREQ_PROC_INTF
	410	/* /proc/acpi/processor/../performance interface (DEPRECATED) */
	411
	412	static int acpi_processor_perf_open_fs(struct inode inode, struct file file);
	413	static struct file_operations acpi_processor_perf_fops = {
4be44fcd LB	414	.open = acpi_processor_perf_open_fs,
	415	.read = seq_read,
	416	.llseek = seq_lseek,
	417	.release = single_release,
1da177e4 LT	418	};
	419
	420	static int acpi_processor_perf_seq_show(struct seq_file seq, void offset)
	421	{
4be44fcd LB	422	struct acpi_processor pr = (struct acpi_processor )seq->private;
4be44fcd LB	423	int i;
1da177e4 LT	424
	425	ACPI_FUNCTION_TRACE("acpi_processor_perf_seq_show");
	426
	427	if (!pr)
	428	goto end;
	429
	430	if (!pr->performance) {
	431	seq_puts(seq, "<not supported>\n");
	432	goto end;
	433	}
	434
	435	seq_printf(seq, "state count: %d\n"
4be44fcd LB	436	"active state: P%d\n",
4be44fcd LB	437	pr->performance->state_count, pr->performance->state);
1da177e4 LT	438
	439	seq_puts(seq, "states:\n");
	440	for (i = 0; i < pr->performance->state_count; i++)
4be44fcd LB	441	seq_printf(seq,
	442	" %cP%d: %d MHz, %d mW, %d uS\n",
	443	(i == pr->performance->state ? '*' : ' '), i,
	444	(u32) pr->performance->states[i].core_frequency,
	445	(u32) pr->performance->states[i].power,
	446	(u32) pr->performance->states[i].transition_latency);
	447
	448	end:
1da177e4 LT	449	return_VALUE(0);
	450	}
	451
	452	static int acpi_processor_perf_open_fs(struct inode inode, struct file file)
	453	{
	454	return single_open(file, acpi_processor_perf_seq_show,
4be44fcd	455	PDE(inode)->data);
1da177e4 LT	456	}
	457
	458	static ssize_t
4be44fcd LB	459	acpi_processor_write_performance(struct file *file,
	460	const char __user * buffer,
	461	size_t count, loff_t * data)
1da177e4	462	{
4be44fcd LB	463	int result = 0;
	464	struct seq_file m = (struct seq_file )file->private_data;
	465	struct acpi_processor pr = (struct acpi_processor )m->private;
1da177e4	466	struct acpi_processor_performance *perf;
4be44fcd LB	467	char state_string[12] = { '\0' };
	468	unsigned int new_state = 0;
	469	struct cpufreq_policy policy;
1da177e4 LT	470
	471	ACPI_FUNCTION_TRACE("acpi_processor_write_performance");
	472
	473	if (!pr \|\| (count > sizeof(state_string) - 1))
	474	return_VALUE(-EINVAL);
	475
	476	perf = pr->performance;
	477	if (!perf)
	478	return_VALUE(-EINVAL);
	479
	480	if (copy_from_user(state_string, buffer, count))
	481	return_VALUE(-EFAULT);
	482
	483	state_string[count] = '\0';
	484	new_state = simple_strtoul(state_string, NULL, 0);
	485
	486	if (new_state >= perf->state_count)
	487	return_VALUE(-EINVAL);
	488
	489	cpufreq_get_policy(&policy, pr->id);
	490
	491	policy.cpu = pr->id;
	492	policy.min = perf->states[new_state].core_frequency * 1000;
	493	policy.max = perf->states[new_state].core_frequency * 1000;
	494
	495	result = cpufreq_set_policy(&policy);
	496	if (result)
	497	return_VALUE(result);
	498
	499	return_VALUE(count);
	500	}
	501
4be44fcd	502	static void acpi_cpufreq_add_file(struct acpi_processor *pr)
1da177e4	503	{
4be44fcd LB	504	struct proc_dir_entry *entry = NULL;
4be44fcd LB	505	struct acpi_device *device = NULL;
1da177e4 LT	506
	507	ACPI_FUNCTION_TRACE("acpi_cpufreq_addfile");
	508
	509	if (acpi_bus_get_device(pr->handle, &device))
	510	return_VOID;
	511
	512	/* add file 'performance' [R/W] */
	513	entry = create_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE,
4be44fcd LB	514	S_IFREG \| S_IRUGO \| S_IWUSR,
4be44fcd LB	515	acpi_device_dir(device));
1da177e4 LT	516	if (!entry)
1da177e4 LT	517	ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
4be44fcd LB	518	"Unable to create '%s' fs entry\n",
4be44fcd LB	519	ACPI_PROCESSOR_FILE_PERFORMANCE));
1da177e4	520	else {
d479e908	521	acpi_processor_perf_fops.write = acpi_processor_write_performance;
1da177e4	522	entry->proc_fops = &acpi_processor_perf_fops;
1da177e4 LT	523	entry->data = acpi_driver_data(device);
	524	entry->owner = THIS_MODULE;
	525	}
	526	return_VOID;
	527	}
	528
4be44fcd	529	static void acpi_cpufreq_remove_file(struct acpi_processor *pr)
1da177e4	530	{
4be44fcd	531	struct acpi_device *device = NULL;
1da177e4 LT	532
	533	ACPI_FUNCTION_TRACE("acpi_cpufreq_addfile");
	534
	535	if (acpi_bus_get_device(pr->handle, &device))
	536	return_VOID;
	537
	538	/* remove file 'performance' */
	539	remove_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE,
4be44fcd	540	acpi_device_dir(device));
1da177e4 LT	541
	542	return_VOID;
	543	}
	544
	545	#else
4be44fcd LB	546	static void acpi_cpufreq_add_file(struct acpi_processor *pr)
	547	{
	548	return;
	549	}
	550	static void acpi_cpufreq_remove_file(struct acpi_processor *pr)
	551	{
	552	return;
	553	}
	554	#endif /* CONFIG_X86_ACPI_CPUFREQ_PROC_INTF */
1da177e4 LT	555
1da177e4 LT	556	int
4be44fcd LB	557	acpi_processor_register_performance(struct acpi_processor_performance
4be44fcd LB	558	*performance, unsigned int cpu)
1da177e4 LT	559	{
	560	struct acpi_processor *pr;
	561
	562	ACPI_FUNCTION_TRACE("acpi_processor_register_performance");
	563
	564	if (!(acpi_processor_ppc_status & PPC_REGISTERED))
	565	return_VALUE(-EINVAL);
	566
	567	down(&performance_sem);
	568
	569	pr = processors[cpu];
	570	if (!pr) {
	571	up(&performance_sem);
	572	return_VALUE(-ENODEV);
	573	}
	574
	575	if (pr->performance) {
	576	up(&performance_sem);
	577	return_VALUE(-EBUSY);
	578	}
	579
	580	pr->performance = performance;
	581
	582	if (acpi_processor_get_performance_info(pr)) {
	583	pr->performance = NULL;
	584	up(&performance_sem);
	585	return_VALUE(-EIO);
	586	}
	587
	588	acpi_cpufreq_add_file(pr);
	589
	590	up(&performance_sem);
	591	return_VALUE(0);
	592	}
1da177e4	593
4be44fcd	594	EXPORT_SYMBOL(acpi_processor_register_performance);
1da177e4 LT	595
1da177e4 LT	596	void
4be44fcd LB	597	acpi_processor_unregister_performance(struct acpi_processor_performance
4be44fcd LB	598	*performance, unsigned int cpu)
1da177e4 LT	599	{
	600	struct acpi_processor *pr;
	601
	602	ACPI_FUNCTION_TRACE("acpi_processor_unregister_performance");
	603
	604	down(&performance_sem);
	605
	606	pr = processors[cpu];
	607	if (!pr) {
	608	up(&performance_sem);
	609	return_VOID;
	610	}
	611
	612	kfree(pr->performance->states);
	613	pr->performance = NULL;
	614
	615	acpi_cpufreq_remove_file(pr);
	616
	617	up(&performance_sem);
	618
	619	return_VOID;
	620	}
4be44fcd	621
1da177e4	622	EXPORT_SYMBOL(acpi_processor_unregister_performance);