i386: move kernel/cpu/cpufreq

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 799 insertions, 0 deletions

diff --git a/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c b/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c
new file mode 100644
index 000000000000..705e13a30781
--- /dev/null
+++ b/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c
@@ -0,0 +1,799 @@
+/*
+ * acpi-cpufreq.c - ACPI Processor P-States Driver ($Revision: 1.4 $)
+ *
+ *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
+ *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
+ *  Copyright (C) 2002 - 2004 Dominik Brodowski <linux@brodo.de>
+ *  Copyright (C) 2006       Denis Sadykov <denis.m.sadykov@intel.com>
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ *  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/smp.h>
+#include <linux/sched.h>
+#include <linux/cpufreq.h>
+#include <linux/compiler.h>
+#include <linux/dmi.h>
+
+#include <linux/acpi.h>
+#include <acpi/processor.h>
+
+#include <asm/io.h>
+#include <asm/msr.h>
+#include <asm/processor.h>
+#include <asm/cpufeature.h>
+#include <asm/delay.h>
+#include <asm/uaccess.h>
+
+#define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_DRIVER, "acpi-cpufreq", msg)
+
+MODULE_AUTHOR("Paul Diefenbaugh, Dominik Brodowski");
+MODULE_DESCRIPTION("ACPI Processor P-States Driver");
+MODULE_LICENSE("GPL");
+
+enum {
+	UNDEFINED_CAPABLE = 0,
+	SYSTEM_INTEL_MSR_CAPABLE,
+	SYSTEM_IO_CAPABLE,
+};
+
+#define INTEL_MSR_RANGE		(0xffff)
+#define CPUID_6_ECX_APERFMPERF_CAPABILITY	(0x1)
+
+struct acpi_cpufreq_data {
+	struct acpi_processor_performance *acpi_data;
+	struct cpufreq_frequency_table *freq_table;
+	unsigned int max_freq;
+	unsigned int resume;
+	unsigned int cpu_feature;
+};
+
+static struct acpi_cpufreq_data *drv_data[NR_CPUS];
+/* acpi_perf_data is a pointer to percpu data. */
+static struct acpi_processor_performance *acpi_perf_data;
+
+static struct cpufreq_driver acpi_cpufreq_driver;
+
+static unsigned int acpi_pstate_strict;
+
+static int check_est_cpu(unsigned int cpuid)
+{
+	struct cpuinfo_x86 *cpu = &cpu_data[cpuid];
+
+	if (cpu->x86_vendor != X86_VENDOR_INTEL ||
+	    !cpu_has(cpu, X86_FEATURE_EST))
+		return 0;
+
+	return 1;
+}
+
+static unsigned extract_io(u32 value, struct acpi_cpufreq_data *data)
+{
+	struct acpi_processor_performance *perf;
+	int i;
+
+	perf = data->acpi_data;
+
+	for (i=0; i<perf->state_count; i++) {
+		if (value == perf->states[i].status)
+			return data->freq_table[i].frequency;
+	}
+	return 0;
+}
+
+static unsigned extract_msr(u32 msr, struct acpi_cpufreq_data *data)
+{
+	int i;
+	struct acpi_processor_performance *perf;
+
+	msr &= INTEL_MSR_RANGE;
+	perf = data->acpi_data;
+
+	for (i=0; data->freq_table[i].frequency != CPUFREQ_TABLE_END; i++) {
+		if (msr == perf->states[data->freq_table[i].index].status)
+			return data->freq_table[i].frequency;
+	}
+	return data->freq_table[0].frequency;
+}
+
+static unsigned extract_freq(u32 val, struct acpi_cpufreq_data *data)
+{
+	switch (data->cpu_feature) {
+	case SYSTEM_INTEL_MSR_CAPABLE:
+		return extract_msr(val, data);
+	case SYSTEM_IO_CAPABLE:
+		return extract_io(val, data);
+	default:
+		return 0;
+	}
+}
+
+struct msr_addr {
+	u32 reg;
+};
+
+struct io_addr {
+	u16 port;
+	u8 bit_width;
+};
+
+typedef union {
+	struct msr_addr msr;
+	struct io_addr io;
+} drv_addr_union;
+
+struct drv_cmd {
+	unsigned int type;
+	cpumask_t mask;
+	drv_addr_union addr;
+	u32 val;
+};
+
+static void do_drv_read(struct drv_cmd *cmd)
+{
+	u32 h;
+
+	switch (cmd->type) {
+	case SYSTEM_INTEL_MSR_CAPABLE:
+		rdmsr(cmd->addr.msr.reg, cmd->val, h);
+		break;
+	case SYSTEM_IO_CAPABLE:
+		acpi_os_read_port((acpi_io_address)cmd->addr.io.port,
+				&cmd->val,
+				(u32)cmd->addr.io.bit_width);
+		break;
+	default:
+		break;
+	}
+}
+
+static void do_drv_write(struct drv_cmd *cmd)
+{
+	u32 lo, hi;
+
+	switch (cmd->type) {
+	case SYSTEM_INTEL_MSR_CAPABLE:
+		rdmsr(cmd->addr.msr.reg, lo, hi);
+		lo = (lo & ~INTEL_MSR_RANGE) | (cmd->val & INTEL_MSR_RANGE);
+		wrmsr(cmd->addr.msr.reg, lo, hi);
+		break;
+	case SYSTEM_IO_CAPABLE:
+		acpi_os_write_port((acpi_io_address)cmd->addr.io.port,
+				cmd->val,
+				(u32)cmd->addr.io.bit_width);
+		break;
+	default:
+		break;
+	}
+}
+
+static void drv_read(struct drv_cmd *cmd)
+{
+	cpumask_t saved_mask = current->cpus_allowed;
+	cmd->val = 0;
+
+	set_cpus_allowed(current, cmd->mask);
+	do_drv_read(cmd);
+	set_cpus_allowed(current, saved_mask);
+}
+
+static void drv_write(struct drv_cmd *cmd)
+{
+	cpumask_t saved_mask = current->cpus_allowed;
+	unsigned int i;
+
+	for_each_cpu_mask(i, cmd->mask) {
+		set_cpus_allowed(current, cpumask_of_cpu(i));
+		do_drv_write(cmd);
+	}
+
+	set_cpus_allowed(current, saved_mask);
+	return;
+}
+
+static u32 get_cur_val(cpumask_t mask)
+{
+	struct acpi_processor_performance *perf;
+	struct drv_cmd cmd;
+
+	if (unlikely(cpus_empty(mask)))
+		return 0;
+
+	switch (drv_data[first_cpu(mask)]->cpu_feature) {
+	case SYSTEM_INTEL_MSR_CAPABLE:
+		cmd.type = SYSTEM_INTEL_MSR_CAPABLE;
+		cmd.addr.msr.reg = MSR_IA32_PERF_STATUS;
+		break;
+	case SYSTEM_IO_CAPABLE:
+		cmd.type = SYSTEM_IO_CAPABLE;
+		perf = drv_data[first_cpu(mask)]->acpi_data;
+		cmd.addr.io.port = perf->control_register.address;
+		cmd.addr.io.bit_width = perf->control_register.bit_width;
+		break;
+	default:
+		return 0;
+	}
+
+	cmd.mask = mask;
+
+	drv_read(&cmd);
+
+	dprintk("get_cur_val = %u\n", cmd.val);
+
+	return cmd.val;
+}
+
+/*
+ * Return the measured active (C0) frequency on this CPU since last call
+ * to this function.
+ * Input: cpu number
+ * Return: Average CPU frequency in terms of max frequency (zero on error)
+ *
+ * We use IA32_MPERF and IA32_APERF MSRs to get the measured performance
+ * over a period of time, while CPU is in C0 state.
+ * IA32_MPERF counts at the rate of max advertised frequency
+ * IA32_APERF counts at the rate of actual CPU frequency
+ * Only IA32_APERF/IA32_MPERF ratio is architecturally defined and
+ * no meaning should be associated with absolute values of these MSRs.
+ */
+static unsigned int get_measured_perf(unsigned int cpu)
+{
+	union {
+		struct {
+			u32 lo;
+			u32 hi;
+		} split;
+		u64 whole;
+	} aperf_cur, mperf_cur;
+
+	cpumask_t saved_mask;
+	unsigned int perf_percent;
+	unsigned int retval;
+
+	saved_mask = current->cpus_allowed;
+	set_cpus_allowed(current, cpumask_of_cpu(cpu));
+	if (get_cpu() != cpu) {
+		/* We were not able to run on requested processor */
+		put_cpu();
+		return 0;
+	}
+
+	rdmsr(MSR_IA32_APERF, aperf_cur.split.lo, aperf_cur.split.hi);
+	rdmsr(MSR_IA32_MPERF, mperf_cur.split.lo, mperf_cur.split.hi);
+
+	wrmsr(MSR_IA32_APERF, 0,0);
+	wrmsr(MSR_IA32_MPERF, 0,0);
+
+#ifdef __i386__
+	/*
+	 * We dont want to do 64 bit divide with 32 bit kernel
+	 * Get an approximate value. Return failure in case we cannot get
+	 * an approximate value.
+	 */
+	if (unlikely(aperf_cur.split.hi || mperf_cur.split.hi)) {
+		int shift_count;
+		u32 h;
+
+		h = max_t(u32, aperf_cur.split.hi, mperf_cur.split.hi);
+		shift_count = fls(h);
+
+		aperf_cur.whole >>= shift_count;
+		mperf_cur.whole >>= shift_count;
+	}
+
+	if (((unsigned long)(-1) / 100) < aperf_cur.split.lo) {
+		int shift_count = 7;
+		aperf_cur.split.lo >>= shift_count;
+		mperf_cur.split.lo >>= shift_count;
+	}
+
+	if (aperf_cur.split.lo && mperf_cur.split.lo)
+		perf_percent = (aperf_cur.split.lo * 100) / mperf_cur.split.lo;
+	else
+		perf_percent = 0;
+
+#else
+	if (unlikely(((unsigned long)(-1) / 100) < aperf_cur.whole)) {
+		int shift_count = 7;
+		aperf_cur.whole >>= shift_count;
+		mperf_cur.whole >>= shift_count;
+	}
+
+	if (aperf_cur.whole && mperf_cur.whole)
+		perf_percent = (aperf_cur.whole * 100) / mperf_cur.whole;
+	else
+		perf_percent = 0;
+
+#endif
+
+	retval = drv_data[cpu]->max_freq * perf_percent / 100;
+
+	put_cpu();
+	set_cpus_allowed(current, saved_mask);
+
+	dprintk("cpu %d: performance percent %d\n", cpu, perf_percent);
+	return retval;
+}
+
+static unsigned int get_cur_freq_on_cpu(unsigned int cpu)
+{
+	struct acpi_cpufreq_data *data = drv_data[cpu];
+	unsigned int freq;
+
+	dprintk("get_cur_freq_on_cpu (%d)\n", cpu);
+
+	if (unlikely(data == NULL ||
+		     data->acpi_data == NULL || data->freq_table == NULL)) {
+		return 0;
+	}
+
+	freq = extract_freq(get_cur_val(cpumask_of_cpu(cpu)), data);
+	dprintk("cur freq = %u\n", freq);
+
+	return freq;
+}
+
+static unsigned int check_freqs(cpumask_t mask, unsigned int freq,
+				struct acpi_cpufreq_data *data)
+{
+	unsigned int cur_freq;
+	unsigned int i;
+
+	for (i=0; i<100; i++) {
+		cur_freq = extract_freq(get_cur_val(mask), data);
+		if (cur_freq == freq)
+			return 1;
+		udelay(10);
+	}
+	return 0;
+}
+
+static int acpi_cpufreq_target(struct cpufreq_policy *policy,
+			       unsigned int target_freq, unsigned int relation)
+{
+	struct acpi_cpufreq_data *data = drv_data[policy->cpu];
+	struct acpi_processor_performance *perf;
+	struct cpufreq_freqs freqs;
+	cpumask_t online_policy_cpus;
+	struct drv_cmd cmd;
+	unsigned int next_state = 0; /* Index into freq_table */
+	unsigned int next_perf_state = 0; /* Index into perf table */
+	unsigned int i;
+	int result = 0;
+
+	dprintk("acpi_cpufreq_target %d (%d)\n", target_freq, policy->cpu);
+
+	if (unlikely(data == NULL ||
+	     data->acpi_data == NULL || data->freq_table == NULL)) {
+		return -ENODEV;
+	}
+
+	perf = data->acpi_data;
+	result = cpufreq_frequency_table_target(policy,
+						data->freq_table,
+						target_freq,
+						relation, &next_state);
+	if (unlikely(result))
+		return -ENODEV;
+
+#ifdef CONFIG_HOTPLUG_CPU
+	/* cpufreq holds the hotplug lock, so we are safe from here on */
+	cpus_and(online_policy_cpus, cpu_online_map, policy->cpus);
+#else
+	online_policy_cpus = policy->cpus;
+#endif
+
+	next_perf_state = data->freq_table[next_state].index;
+	if (perf->state == next_perf_state) {
+		if (unlikely(data->resume)) {
+			dprintk("Called after resume, resetting to P%d\n",
+				next_perf_state);
+			data->resume = 0;
+		} else {
+			dprintk("Already at target state (P%d)\n",
+				next_perf_state);
+			return 0;
+		}
+	}
+
+	switch (data->cpu_feature) {
+	case SYSTEM_INTEL_MSR_CAPABLE:
+		cmd.type = SYSTEM_INTEL_MSR_CAPABLE;
+		cmd.addr.msr.reg = MSR_IA32_PERF_CTL;
+		cmd.val = (u32) perf->states[next_perf_state].control;
+		break;
+	case SYSTEM_IO_CAPABLE:
+		cmd.type = SYSTEM_IO_CAPABLE;
+		cmd.addr.io.port = perf->control_register.address;
+		cmd.addr.io.bit_width = perf->control_register.bit_width;
+		cmd.val = (u32) perf->states[next_perf_state].control;
+		break;
+	default:
+		return -ENODEV;
+	}
+
+	cpus_clear(cmd.mask);
+
+	if (policy->shared_type != CPUFREQ_SHARED_TYPE_ANY)
+		cmd.mask = online_policy_cpus;
+	else
+		cpu_set(policy->cpu, cmd.mask);
+
+	freqs.old = perf->states[perf->state].core_frequency * 1000;
+	freqs.new = data->freq_table[next_state].frequency;
+	for_each_cpu_mask(i, cmd.mask) {
+		freqs.cpu = i;
+		cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
+	}
+
+	drv_write(&cmd);
+
+	if (acpi_pstate_strict) {
+		if (!check_freqs(cmd.mask, freqs.new, data)) {
+			dprintk("acpi_cpufreq_target failed (%d)\n",
+				policy->cpu);
+			return -EAGAIN;
+		}
+	}
+
+	for_each_cpu_mask(i, cmd.mask) {
+		freqs.cpu = i;
+		cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
+	}
+	perf->state = next_perf_state;
+
+	return result;
+}
+
+static int acpi_cpufreq_verify(struct cpufreq_policy *policy)
+{
+	struct acpi_cpufreq_data *data = drv_data[policy->cpu];
+
+	dprintk("acpi_cpufreq_verify\n");
+
+	return cpufreq_frequency_table_verify(policy, data->freq_table);
+}
+
+static unsigned long
+acpi_cpufreq_guess_freq(struct acpi_cpufreq_data *data, unsigned int cpu)
+{
+	struct acpi_processor_performance *perf = data->acpi_data;
+
+	if (cpu_khz) {
+		/* search the closest match to cpu_khz */
+		unsigned int i;
+		unsigned long freq;
+		unsigned long freqn = perf->states[0].core_frequency * 1000;
+
+		for (i=0; i<(perf->state_count-1); i++) {
+			freq = freqn;
+			freqn = perf->states[i+1].core_frequency * 1000;
+			if ((2 * cpu_khz) > (freqn + freq)) {
+				perf->state = i;
+				return freq;
+			}
+		}
+		perf->state = perf->state_count-1;
+		return freqn;
+	} else {
+		/* assume CPU is at P0... */
+		perf->state = 0;
+		return perf->states[0].core_frequency * 1000;
+	}
+}
+
+/*
+ * acpi_cpufreq_early_init - initialize ACPI P-States library
+ *
+ * Initialize the ACPI P-States library (drivers/acpi/processor_perflib.c)
+ * in order to determine correct frequency and voltage pairings. We can
+ * do _PDC and _PSD and find out the processor dependency for the
+ * actual init that will happen later...
+ */
+static int __init acpi_cpufreq_early_init(void)
+{
+	dprintk("acpi_cpufreq_early_init\n");
+
+	acpi_perf_data = alloc_percpu(struct acpi_processor_performance);
+	if (!acpi_perf_data) {
+		dprintk("Memory allocation error for acpi_perf_data.\n");
+		return -ENOMEM;
+	}
+
+	/* Do initialization in ACPI core */
+	acpi_processor_preregister_performance(acpi_perf_data);
+	return 0;
+}
+
+#ifdef CONFIG_SMP
+/*
+ * Some BIOSes do SW_ANY coordination internally, either set it up in hw
+ * or do it in BIOS firmware and won't inform about it to OS. If not
+ * detected, this has a side effect of making CPU run at a different speed
+ * than OS intended it to run at. Detect it and handle it cleanly.
+ */
+static int bios_with_sw_any_bug;
+
+static int sw_any_bug_found(struct dmi_system_id *d)
+{
+	bios_with_sw_any_bug = 1;
+	return 0;
+}
+
+static struct dmi_system_id sw_any_bug_dmi_table[] = {
+	{
+		.callback = sw_any_bug_found,
+		.ident = "Supermicro Server X6DLP",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "Supermicro"),
+			DMI_MATCH(DMI_BIOS_VERSION, "080010"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "X6DLP"),
+		},
+	},
+	{ }
+};
+#endif
+
+static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy)
+{
+	unsigned int i;
+	unsigned int valid_states = 0;
+	unsigned int cpu = policy->cpu;
+	struct acpi_cpufreq_data *data;
+	unsigned int result = 0;
+	struct cpuinfo_x86 *c = &cpu_data[policy->cpu];
+	struct acpi_processor_performance *perf;
+
+	dprintk("acpi_cpufreq_cpu_init\n");
+
+	data = kzalloc(sizeof(struct acpi_cpufreq_data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	data->acpi_data = percpu_ptr(acpi_perf_data, cpu);
+	drv_data[cpu] = data;
+
+	if (cpu_has(c, X86_FEATURE_CONSTANT_TSC))
+		acpi_cpufreq_driver.flags |= CPUFREQ_CONST_LOOPS;
+
+	result = acpi_processor_register_performance(data->acpi_data, cpu);
+	if (result)
+		goto err_free;
+
+	perf = data->acpi_data;
+	policy->shared_type = perf->shared_type;
+
+	/*
+	 * Will let policy->cpus know about dependency only when software
+	 * coordination is required.
+	 */
+	if (policy->shared_type == CPUFREQ_SHARED_TYPE_ALL ||
+	    policy->shared_type == CPUFREQ_SHARED_TYPE_ANY) {
+		policy->cpus = perf->shared_cpu_map;
+	}
+
+#ifdef CONFIG_SMP
+	dmi_check_system(sw_any_bug_dmi_table);
+	if (bios_with_sw_any_bug && cpus_weight(policy->cpus) == 1) {
+		policy->shared_type = CPUFREQ_SHARED_TYPE_ALL;
+		policy->cpus = cpu_core_map[cpu];
+	}
+#endif
+
+	/* capability check */
+	if (perf->state_count <= 1) {
+		dprintk("No P-States\n");
+		result = -ENODEV;
+		goto err_unreg;
+	}
+
+	if (perf->control_register.space_id != perf->status_register.space_id) {
+		result = -ENODEV;
+		goto err_unreg;
+	}
+
+	switch (perf->control_register.space_id) {
+	case ACPI_ADR_SPACE_SYSTEM_IO:
+		dprintk("SYSTEM IO addr space\n");
+		data->cpu_feature = SYSTEM_IO_CAPABLE;
+		break;
+	case ACPI_ADR_SPACE_FIXED_HARDWARE:
+		dprintk("HARDWARE addr space\n");
+		if (!check_est_cpu(cpu)) {
+			result = -ENODEV;
+			goto err_unreg;
+		}
+		data->cpu_feature = SYSTEM_INTEL_MSR_CAPABLE;
+		break;
+	default:
+		dprintk("Unknown addr space %d\n",
+			(u32) (perf->control_register.space_id));
+		result = -ENODEV;
+		goto err_unreg;
+	}
+
+	data->freq_table = kmalloc(sizeof(struct cpufreq_frequency_table) *
+		    (perf->state_count+1), GFP_KERNEL);
+	if (!data->freq_table) {
+		result = -ENOMEM;
+		goto err_unreg;
+	}
+
+	/* detect transition latency */
+	policy->cpuinfo.transition_latency = 0;
+	for (i=0; i<perf->state_count; i++) {
+		if ((perf->states[i].transition_latency * 1000) >
+		    policy->cpuinfo.transition_latency)
+			policy->cpuinfo.transition_latency =
+			    perf->states[i].transition_latency * 1000;
+	}
+	policy->governor = CPUFREQ_DEFAULT_GOVERNOR;
+
+	data->max_freq = perf->states[0].core_frequency * 1000;
+	/* table init */
+	for (i=0; i<perf->state_count; i++) {
+		if (i>0 && perf->states[i].core_frequency >=
+		    data->freq_table[valid_states-1].frequency / 1000)
+			continue;
+
+		data->freq_table[valid_states].index = i;
+		data->freq_table[valid_states].frequency =
+		    perf->states[i].core_frequency * 1000;
+		valid_states++;
+	}
+	data->freq_table[valid_states].frequency = CPUFREQ_TABLE_END;
+	perf->state = 0;
+
+	result = cpufreq_frequency_table_cpuinfo(policy, data->freq_table);
+	if (result)
+		goto err_freqfree;
+
+	switch (perf->control_register.space_id) {
+	case ACPI_ADR_SPACE_SYSTEM_IO:
+		/* Current speed is unknown and not detectable by IO port */
+		policy->cur = acpi_cpufreq_guess_freq(data, policy->cpu);
+		break;
+	case ACPI_ADR_SPACE_FIXED_HARDWARE:
+		acpi_cpufreq_driver.get = get_cur_freq_on_cpu;
+		policy->cur = get_cur_freq_on_cpu(cpu);
+		break;
+	default:
+		break;
+	}
+
+	/* notify BIOS that we exist */
+	acpi_processor_notify_smm(THIS_MODULE);
+
+	/* Check for APERF/MPERF support in hardware */
+	if (c->x86_vendor == X86_VENDOR_INTEL && c->cpuid_level >= 6) {
+		unsigned int ecx;
+		ecx = cpuid_ecx(6);
+		if (ecx & CPUID_6_ECX_APERFMPERF_CAPABILITY)
+			acpi_cpufreq_driver.getavg = get_measured_perf;
+	}
+
+	dprintk("CPU%u - ACPI performance management activated.\n", cpu);
+	for (i = 0; i < perf->state_count; i++)
+		dprintk("     %cP%d: %d MHz, %d mW, %d uS\n",
+			(i == perf->state ? '*' : ' '), i,
+			(u32) perf->states[i].core_frequency,
+			(u32) perf->states[i].power,
+			(u32) perf->states[i].transition_latency);
+
+	cpufreq_frequency_table_get_attr(data->freq_table, policy->cpu);
+
+	/*
+	 * the first call to ->target() should result in us actually
+	 * writing something to the appropriate registers.
+	 */
+	data->resume = 1;
+
+	return result;
+
+err_freqfree:
+	kfree(data->freq_table);
+err_unreg:
+	acpi_processor_unregister_performance(perf, cpu);
+err_free:
+	kfree(data);
+	drv_data[cpu] = NULL;
+
+	return result;
+}
+
+static int acpi_cpufreq_cpu_exit(struct cpufreq_policy *policy)
+{
+	struct acpi_cpufreq_data *data = drv_data[policy->cpu];
+
+	dprintk("acpi_cpufreq_cpu_exit\n");
+
+	if (data) {
+		cpufreq_frequency_table_put_attr(policy->cpu);
+		drv_data[policy->cpu] = NULL;
+		acpi_processor_unregister_performance(data->acpi_data,
+						      policy->cpu);
+		kfree(data);
+	}
+
+	return 0;
+}
+
+static int acpi_cpufreq_resume(struct cpufreq_policy *policy)
+{
+	struct acpi_cpufreq_data *data = drv_data[policy->cpu];
+
+	dprintk("acpi_cpufreq_resume\n");
+
+	data->resume = 1;
+
+	return 0;
+}
+
+static struct freq_attr *acpi_cpufreq_attr[] = {
+	&cpufreq_freq_attr_scaling_available_freqs,
+	NULL,
+};
+
+static struct cpufreq_driver acpi_cpufreq_driver = {
+	.verify = acpi_cpufreq_verify,
+	.target = acpi_cpufreq_target,
+	.init = acpi_cpufreq_cpu_init,
+	.exit = acpi_cpufreq_cpu_exit,
+	.resume = acpi_cpufreq_resume,
+	.name = "acpi-cpufreq",
+	.owner = THIS_MODULE,
+	.attr = acpi_cpufreq_attr,
+};
+
+static int __init acpi_cpufreq_init(void)
+{
+	int ret;
+
+	dprintk("acpi_cpufreq_init\n");
+
+	ret = acpi_cpufreq_early_init();
+	if (ret)
+		return ret;
+
+	return cpufreq_register_driver(&acpi_cpufreq_driver);
+}
+
+static void __exit acpi_cpufreq_exit(void)
+{
+	dprintk("acpi_cpufreq_exit\n");
+
+	cpufreq_unregister_driver(&acpi_cpufreq_driver);
+
+	free_percpu(acpi_perf_data);
+
+	return;
+}
+
+module_param(acpi_pstate_strict, uint, 0644);
+MODULE_PARM_DESC(acpi_pstate_strict,
+	"value 0 or non-zero. non-zero -> strict ACPI checks are "
+	"performed during frequency changes.");
+
+late_initcall(acpi_cpufreq_init);
+module_exit(acpi_cpufreq_exit);
+
+MODULE_ALIAS("acpi");