Creation of Cybook 2416 (actually Gen4) repository

drivers/acpi/processor_perflib.c

@@ -0,0 +1,814 @@
+/*
+ * processor_perflib.c - ACPI Processor P-States Library ($Revision: 1.1.1.1 $)
+ *
+ *  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_COMPONENT
+ACPI_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_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 = 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;
+}
+
+static void acpi_cpufreq_remove_file(struct acpi_processor *pr)
+{
+	struct acpi_device *device = NULL;
+
+
+	if (acpi_bus_get_device(pr->handle, &device))
+		return;
+
+	/* remove file 'performance' */
+	remove_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE,
+			  acpi_device_dir(device));
+
+	return;
+}
+
+#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 */
+
+static int acpi_processor_get_psd(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("NNNNN"), "NNNNN"};
+	struct acpi_buffer state = {0, NULL};
+	union acpi_object  *psd = NULL;
+	struct acpi_psd_package *pdomain;
+
+	status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer);
+	if (ACPI_FAILURE(status)) {
+		return -ENODEV;
+	}
+
+	psd = buffer.pointer;
+	if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
+		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n"));
+		result = -EFAULT;
+		goto end;
+	}
+
+	if (psd->package.count != 1) {
+		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n"));
+		result = -EFAULT;
+		goto end;
+	}
+
+	pdomain = &(pr->performance->domain_info);
+
+	state.length = sizeof(struct acpi_psd_package);
+	state.pointer = pdomain;
+
+	status = acpi_extract_package(&(psd->package.elements[0]),
+		&format, &state);
+	if (ACPI_FAILURE(status)) {
+		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n"));
+		result = -EFAULT;
+		goto end;
+	}
+
+	if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
+		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _PSD:num_entries\n"));
+		result = -EFAULT;
+		goto end;
+	}
+
+	if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
+		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _PSD:revision\n"));
+		result = -EFAULT;
+		goto end;
+	}
+
+end:
+	kfree(buffer.pointer);
+	return result;
+}
+
+int acpi_processor_preregister_performance(
+		struct acpi_processor_performance **performance)
+{
+	int count, count_target;
+	int retval = 0;
+	unsigned int i, j;
+	cpumask_t covered_cpus;
+	struct acpi_processor *pr;
+	struct acpi_psd_package *pdomain;
+	struct acpi_processor *match_pr;
+	struct acpi_psd_package *match_pdomain;
+
+	mutex_lock(&performance_mutex);
+
+	retval = 0;
+
+	/* Call _PSD for all CPUs */
+	for_each_possible_cpu(i) {
+		pr = processors[i];
+		if (!pr) {
+			/* Look only at processors in ACPI namespace */
+			continue;
+		}
+
+		if (pr->performance) {
+			retval = -EBUSY;
+			continue;
+		}
+
+		if (!performance || !performance[i]) {
+			retval = -EINVAL;
+			continue;
+		}
+
+		pr->performance = performance[i];
+		cpu_set(i, pr->performance->shared_cpu_map);
+		if (acpi_processor_get_psd(pr)) {
+			retval = -EINVAL;
+			continue;
+		}
+	}
+	if (retval)
+		goto err_ret;
+
+	/*
+	 * Now that we have _PSD data from all CPUs, lets setup P-state 
+	 * domain info.
+	 */
+	for_each_possible_cpu(i) {
+		pr = processors[i];
+		if (!pr)
+			continue;
+
+		/* Basic validity check for domain info */
+		pdomain = &(pr->performance->domain_info);
+		if ((pdomain->revision != ACPI_PSD_REV0_REVISION) ||
+		    (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES)) {
+			retval = -EINVAL;
+			goto err_ret;
+		}
+		if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
+		    pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
+		    pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
+			retval = -EINVAL;
+			goto err_ret;
+		}
+	}
+
+	cpus_clear(covered_cpus);
+	for_each_possible_cpu(i) {
+		pr = processors[i];
+		if (!pr)
+			continue;
+
+		if (cpu_isset(i, covered_cpus))
+			continue;
+
+		pdomain = &(pr->performance->domain_info);
+		cpu_set(i, pr->performance->shared_cpu_map);
+		cpu_set(i, covered_cpus);
+		if (pdomain->num_processors <= 1)
+			continue;
+
+		/* Validate the Domain info */
+		count_target = pdomain->num_processors;
+		count = 1;
+		if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
+			pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
+		else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
+			pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
+		else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
+			pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
+
+		for_each_possible_cpu(j) {
+			if (i == j)
+				continue;
+
+			match_pr = processors[j];
+			if (!match_pr)
+				continue;
+
+			match_pdomain = &(match_pr->performance->domain_info);
+			if (match_pdomain->domain != pdomain->domain)
+				continue;
+
+			/* Here i and j are in the same domain */
+
+			if (match_pdomain->num_processors != count_target) {
+				retval = -EINVAL;
+				goto err_ret;
+			}
+
+			if (pdomain->coord_type != match_pdomain->coord_type) {
+				retval = -EINVAL;
+				goto err_ret;
+			}
+
+			cpu_set(j, covered_cpus);
+			cpu_set(j, pr->performance->shared_cpu_map);
+			count++;
+		}
+
+		for_each_possible_cpu(j) {
+			if (i == j)
+				continue;
+
+			match_pr = processors[j];
+			if (!match_pr)
+				continue;
+
+			match_pdomain = &(match_pr->performance->domain_info);
+			if (match_pdomain->domain != pdomain->domain)
+				continue;
+
+			match_pr->performance->shared_type = 
+					pr->performance->shared_type;
+			match_pr->performance->shared_cpu_map =
+				pr->performance->shared_cpu_map;
+		}
+	}
+
+err_ret:
+	for_each_possible_cpu(i) {
+		pr = processors[i];
+		if (!pr || !pr->performance)
+			continue;
+
+		/* Assume no coordination on any error parsing domain info */
+		if (retval) {
+			cpus_clear(pr->performance->shared_cpu_map);
+			cpu_set(i, pr->performance->shared_cpu_map);
+			pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
+		}
+		pr->performance = NULL; /* Will be set for real in register */
+	}
+
+	mutex_unlock(&performance_mutex);
+	return retval;
+}
+EXPORT_SYMBOL(acpi_processor_preregister_performance);
+
+
+int
+acpi_processor_register_performance(struct acpi_processor_performance
+				    *performance, unsigned int cpu)
+{
+	struct acpi_processor *pr;
+
+
+	if (!(acpi_processor_ppc_status & PPC_REGISTERED))
+		return -EINVAL;
+
+	mutex_lock(&performance_mutex);
+
+	pr = processors[cpu];
+	if (!pr) {
+		mutex_unlock(&performance_mutex);
+		return -ENODEV;
+	}
+
+	if (pr->performance) {
+		mutex_unlock(&performance_mutex);
+		return -EBUSY;
+	}
+
+	WARN_ON(!performance);
+
+	pr->performance = performance;
+
+	if (acpi_processor_get_performance_info(pr)) {
+		pr->performance = NULL;
+		mutex_unlock(&performance_mutex);
+		return -EIO;
+	}
+
+	acpi_cpufreq_add_file(pr);
+
+	mutex_unlock(&performance_mutex);
+	return 0;
+}
+
+EXPORT_SYMBOL(acpi_processor_register_performance);
+
+void
+acpi_processor_unregister_performance(struct acpi_processor_performance
+				      *performance, unsigned int cpu)
+{
+	struct acpi_processor *pr;
+
+
+	mutex_lock(&performance_mutex);
+
+	pr = processors[cpu];
+	if (!pr) {
+		mutex_unlock(&performance_mutex);
+		return;
+	}
+
+	if (pr->performance)
+		kfree(pr->performance->states);
+	pr->performance = NULL;
+
+	acpi_cpufreq_remove_file(pr);
+
+	mutex_unlock(&performance_mutex);
+
+	return;
+}
+
+EXPORT_SYMBOL(acpi_processor_unregister_performance);