/* * 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_COMPONENTACPI_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 intacpi_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 intacpi_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 intacpi_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 intacpi_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); 	acpi_processor_set_pdc(pr, pr->performance->pdc); 	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_tacpi_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)

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