/* * 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 <linux/mutex.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_FILE_PERFORMANCE	"performance"#define _COMPONENT		ACPI_PROCESSOR_COMPONENTACPI_MODULE_NAME("processor_perflib"); static DEFINE_MUTEX(performance_mutex); /* * _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; 	mutex_lock(&performance_mutex); 	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 >= pr->performance->state_count)		goto out; 	cpufreq_verify_within_limits(policy, 0,				     pr->performance->states[ppc].				     core_frequency * 1000);       out:	mutex_unlock(&performance_mutex); 	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;  	if (!pr)		return -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_EXCEPTION((AE_INFO, status, "Evaluating _PPC"));		return -ENODEV;	} 	pr->performance_platform_limit = (int)ppc; 	return 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 };  	status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);	if (ACPI_FAILURE(status)) {		ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT"));		return -ENODEV;	} 	pct = (union acpi_object *)buffer.pointer;	if (!pct || (pct->type != ACPI_TYPE_PACKAGE)	    || (pct->package.count != 2)) {		printk(KERN_ERR PREFIX "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)) {		printk(KERN_ERR PREFIX "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)) {		printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n");		result = -EFAULT;		goto end;	} 	memcpy(&pr->performance->status_register, obj.buffer.pointer,	       sizeof(struct acpi_pct_register));       end:	kfree(buffer.pointer); 	return 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;  	status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);	if (ACPI_FAILURE(status)) {		ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS"));		return -ENODEV;	} 	pss = buffer.pointer;	if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {		printk(KERN_ERR PREFIX "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_EXCEPTION((AE_INFO, status, "Invalid _PSS data"));			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) {			printk(KERN_ERR PREFIX				    "Invalid _PSS data: freq is zero\n");			result = -EFAULT;			kfree(pr->performance->states);			goto end;		}	}       end:	kfree(buffer.pointer); 	return result;} static int acpi_processor_get_performance_info(struct acpi_processor *pr){	int result = 0;	acpi_status status = AE_OK;	acpi_handle handle = NULL;  	if (!pr || !pr->performance || !pr->handle)		return -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 -ENODEV;	} 	result = acpi_processor_get_performance_control(pr);	if (result)		return result; 	result = acpi_processor_get_performance_states(pr);	if (result)		return result; 	return 0;} int acpi_processor_notify_smm(struct module *calling_module){	acpi_status status;	static int is_done = 0;  	if (!(acpi_processor_ppc_status & PPC_REGISTERED))		return -EBUSY; 	if (!try_module_get(calling_module))		return -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 0;	} else if (is_done < 0) {		module_put(calling_module);		return is_done;	} 	is_done = -EIO; 	/* Can't write pstate_control to smi_command if either value is zero */	if ((!acpi_gbl_FADT.smi_command) || (!acpi_gbl_FADT.pstate_control)) {		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n"));		module_put(calling_module);		return 0;	} 	ACPI_DEBUG_PRINT((ACPI_DB_INFO,			  "Writing pstate_control [0x%x] to smi_command [0x%x]\n",			  acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command)); 	status = acpi_os_write_port(acpi_gbl_FADT.smi_command,				    (u32) acpi_gbl_FADT.pstate_control, 8);	if (ACPI_FAILURE(status)) {		ACPI_EXCEPTION((AE_INFO, status,				"Failed to write pstate_control [0x%x] to "				"smi_command [0x%x]", acpi_gbl_FADT.pstate_control,				acpi_gbl_FADT.smi_command));		module_put(calling_module);		return 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 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 = seq->private;	int i;  	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 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 = file->private_data;	struct acpi_processor *pr = m->private;	struct acpi_processor_performance *perf;	char state_string[12] = { '\0' };	unsigned int new_state = 0;	struct cpufreq_policy policy;  	if (!pr || (count > sizeof(state_string) - 1))		return -EINVAL; 	perf = pr->performance;	if (!perf)		return -EINVAL; 	if (copy_from_user(state_string, buffer, count))		return -EFAULT; 	state_string[count] = '\0';	new_state = simple_strtoul(state_string, NULL, 0); 	if (new_state >= perf->state_count)		return -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 result; 	return count;} static void acpi_cpufreq_add_file(struct acpi_processor *pr){	struct proc_dir_entry *entry = NULL;	struct acpi_device *device = NULL;  	if (acpi_bus_get_device(pr->handle, &device))		return; 	/* 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_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;} 

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