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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen-unstable] x86: Setup cpufreq infrasturcture, driver and tools
# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1210769711 -3600
# Node ID 50fb7620d05ad869f354619e9fdf72e316c0d2b5
# Parent 66ddfc4d69631a069d8914bff12bd54fe97a4e9f
x86: Setup cpufreq infrasturcture, driver and tools
Initializing basic Px data structure, setup cpufreq infrastructure:
* cpufreq data structure initializing, including freq table and policy;
* basic driver and tools, to measure freq or drive to Px target;
* setup _PSD domain to coordinately work;
Signed-off-by: Liu Jinsong <jinsong.liu@xxxxxxxxx>
---
xen/arch/x86/acpi/cpufreq/Makefile | 2
xen/arch/x86/acpi/cpufreq/cpufreq.c | 557 ++++++++++++++++++++++++++-
xen/arch/x86/acpi/cpufreq/cpufreq_ondemand.c | 6
xen/arch/x86/acpi/cpufreq/utility.c | 167 ++++++++
xen/include/acpi/cpufreq/cpufreq.h | 129 ++++++
5 files changed, 858 insertions(+), 3 deletions(-)
diff -r 66ddfc4d6963 -r 50fb7620d05a xen/arch/x86/acpi/cpufreq/Makefile
--- a/xen/arch/x86/acpi/cpufreq/Makefile Wed May 14 13:50:46 2008 +0100
+++ b/xen/arch/x86/acpi/cpufreq/Makefile Wed May 14 13:55:11 2008 +0100
@@ -1,1 +1,3 @@ obj-y += cpufreq.o
obj-y += cpufreq.o
+obj-y += utility.o
+obj-y += cpufreq_ondemand.o
diff -r 66ddfc4d6963 -r 50fb7620d05a xen/arch/x86/acpi/cpufreq/cpufreq.c
--- a/xen/arch/x86/acpi/cpufreq/cpufreq.c Wed May 14 13:50:46 2008 +0100
+++ b/xen/arch/x86/acpi/cpufreq/cpufreq.c Wed May 14 13:55:11 2008 +0100
@@ -42,11 +42,562 @@
#include <asm/percpu.h>
#include <asm/cpufeature.h>
#include <acpi/acpi.h>
-#include <acpi/cpufreq/processor_perf.h>
+#include <acpi/cpufreq/cpufreq.h>
struct processor_pminfo processor_pminfo[NR_CPUS];
+struct cpufreq_policy xen_px_policy[NR_CPUS];
+
+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 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];
+
+static struct cpufreq_driver acpi_cpufreq_driver;
+
+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 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 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(void *drvcmd)
+{
+ struct drv_cmd *cmd;
+ u32 lo, hi;
+
+ cmd = (struct drv_cmd *)drvcmd;
+
+ 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)
+{
+ cmd->val = 0;
+
+ do_drv_read(cmd);
+}
+
+static void drv_write(struct drv_cmd *cmd)
+{
+ on_selected_cpus( cmd->mask, do_drv_write, (void *)cmd, 0, 0);
+}
+
+static u32 get_cur_val(cpumask_t mask)
+{
+ struct 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);
+ 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.
+ */
+/* FIXME: handle query on non-current cpu later */
+static unsigned int get_measured_perf(unsigned int cpu)
+{
+ union {
+ struct {
+ uint32_t lo;
+ uint32_t hi;
+ } split;
+ uint64_t whole;
+ } aperf_cur, mperf_cur;
+
+ unsigned int perf_percent;
+ unsigned int retval;
+
+ 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);
+
+ 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;
+
+
+ retval = drv_data[cpu]->max_freq * perf_percent / 100;
+ return retval;
+}
+
+static unsigned int get_cur_freq_on_cpu(unsigned int cpu)
+{
+ struct acpi_cpufreq_data *data = drv_data[cpu];
+ unsigned int freq;
+
+ 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);
+ 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 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 */
+ int result = 0;
+
+ 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;
+
+ online_policy_cpus = policy->cpus;
+
+ next_perf_state = data->freq_table[next_state].index;
+ if (perf->state == next_perf_state) {
+ if (unlikely(data->resume)) {
+ printk("xen_pminfo: @acpi_cpufreq_target, "
+ "Called after resume, resetting to P%d\n",
+ next_perf_state);
+ data->resume = 0;
+ }
+ else
+ 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;
+
+ drv_write(&cmd);
+
+ if (!check_freqs(cmd.mask, freqs.new, data))
+ return -EAGAIN;
+
+ perf->state = next_perf_state;
+ policy->cur = freqs.new;
+
+ return result;
+}
+
+static unsigned long
+acpi_cpufreq_guess_freq(struct acpi_cpufreq_data *data, unsigned int cpu)
+{
+ struct 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;
+ }
+}
+
+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 processor_performance *perf;
+
+ data = xmalloc(struct acpi_cpufreq_data);
+ if (!data)
+ return -ENOMEM;
+ memset(data, 0, sizeof(struct acpi_cpufreq_data));
+
+ drv_data[cpu] = data;
+
+ data->acpi_data = &processor_pminfo[cpu].perf;
+
+ 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;
+ } else {
+ policy->cpus = cpumask_of_cpu(cpu);
+ }
+
+ /* capability check */
+ if (perf->state_count <= 1) {
+ printk("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:
+ printk("xen_pminfo: @acpi_cpufreq_cpu_init,"
+ "SYSTEM IO addr space\n");
+ data->cpu_feature = SYSTEM_IO_CAPABLE;
+ break;
+ case ACPI_ADR_SPACE_FIXED_HARDWARE:
+ printk("xen_pminfo: @acpi_cpufreq_cpu_init,"
+ "HARDWARE addr space\n");
+ if (!check_est_cpu(cpu)) {
+ result = -ENODEV;
+ goto err_unreg;
+ }
+ data->cpu_feature = SYSTEM_INTEL_MSR_CAPABLE;
+ break;
+ default:
+ result = -ENODEV;
+ goto err_unreg;
+ }
+
+ data->freq_table = xmalloc_array(struct cpufreq_frequency_table,
+ (perf->state_count+1));
+ 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;
+ }
+
+ 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;
+ }
+
+ /* 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;
+ }
+
+ /*
+ * the first call to ->target() should result in us actually
+ * writing something to the appropriate registers.
+ */
+ data->resume = 1;
+
+ return result;
+
+err_freqfree:
+ xfree(data->freq_table);
+err_unreg:
+ xfree(data);
+ drv_data[cpu] = NULL;
+
+ return result;
+}
+
+static struct cpufreq_driver acpi_cpufreq_driver = {
+ .target = acpi_cpufreq_target,
+ .init = acpi_cpufreq_cpu_init,
+};
int acpi_cpufreq_init(void)
{
- return 0;
-}
+ unsigned int i, ret = 0;
+ unsigned int dom, max_dom = 0;
+ cpumask_t *pt, dom_mask;
+
+ cpus_clear(dom_mask);
+
+ for_each_online_cpu(i) {
+ cpu_set(processor_pminfo[i].perf.domain_info.domain, dom_mask);
+ if (max_dom < processor_pminfo[i].perf.domain_info.domain)
+ max_dom = processor_pminfo[i].perf.domain_info.domain;
+ }
+ max_dom++;
+
+ pt = xmalloc_array(cpumask_t, max_dom);
+ if (!pt)
+ return -ENOMEM;
+ memset(pt, 0, max_dom * sizeof(cpumask_t));
+
+ /* get cpumask of each psd domain */
+ for_each_online_cpu(i)
+ cpu_set(i, pt[processor_pminfo[i].perf.domain_info.domain]);
+
+ for_each_online_cpu(i)
+ processor_pminfo[i].perf.shared_cpu_map =
+ pt[processor_pminfo[i].perf.domain_info.domain];
+
+ cpufreq_driver = &acpi_cpufreq_driver;
+
+ /* setup cpufreq infrastructure */
+ for_each_online_cpu(i) {
+ xen_px_policy[i].cpu = i;
+
+ ret = acpi_cpufreq_cpu_init(&xen_px_policy[i]);
+ if (ret)
+ goto cpufreq_init_out;
+ }
+
+ /* setup ondemand cpufreq */
+ for (dom=0; dom<max_dom; dom++) {
+ if (!cpu_isset(dom, dom_mask))
+ continue;
+ i = first_cpu(pt[dom]);
+ ret = cpufreq_governor_dbs(&xen_px_policy[i], CPUFREQ_GOV_START);
+ if (ret)
+ goto cpufreq_init_out;
+ }
+
+cpufreq_init_out:
+ xfree(pt);
+
+ return ret;
+}
diff -r 66ddfc4d6963 -r 50fb7620d05a
xen/arch/x86/acpi/cpufreq/cpufreq_ondemand.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/xen/arch/x86/acpi/cpufreq/cpufreq_ondemand.c Wed May 14 13:55:11
2008 +0100
@@ -0,0 +1,6 @@
+#include <acpi/cpufreq/cpufreq.h>
+
+int cpufreq_governor_dbs(struct cpufreq_policy *policy, unsigned int event)
+{
+ return 0;
+}
diff -r 66ddfc4d6963 -r 50fb7620d05a xen/arch/x86/acpi/cpufreq/utility.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/xen/arch/x86/acpi/cpufreq/utility.c Wed May 14 13:55:11 2008 +0100
@@ -0,0 +1,167 @@
+/*
+ * utility.c - misc functions for cpufreq driver and Px statistic
+ *
+ * Copyright (C) 2001 Russell King
+ * (C) 2002 - 2003 Dominik Brodowski <linux@xxxxxxxx>
+ *
+ * Oct 2005 - Ashok Raj <ashok.raj@xxxxxxxxx>
+ * Added handling for CPU hotplug
+ * Feb 2006 - Jacob Shin <jacob.shin@xxxxxxx>
+ * Fix handling for CPU hotplug -- affected CPUs
+ * Feb 2008 - Liu Jinsong <jinsong.liu@xxxxxxxxx>
+ * 1. Merge cpufreq.c and freq_table.c of linux 2.6.23
+ * And poring to Xen hypervisor
+ * 2. some Px statistic interface funcdtions
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <xen/errno.h>
+#include <xen/cpumask.h>
+#include <xen/types.h>
+#include <xen/spinlock.h>
+#include <xen/percpu.h>
+#include <xen/types.h>
+#include <xen/sched.h>
+#include <xen/timer.h>
+#include <asm/config.h>
+#include <acpi/cpufreq/cpufreq.h>
+#include <public/sysctl.h>
+
+struct cpufreq_driver *cpufreq_driver;
+
+/*********************************************************************
+ * FREQUENCY TABLE HELPERS *
+ *********************************************************************/
+
+int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
+ struct cpufreq_frequency_table *table)
+{
+ unsigned int min_freq = ~0;
+ unsigned int max_freq = 0;
+ unsigned int i;
+
+ for (i=0; (table[i].frequency != CPUFREQ_TABLE_END); i++) {
+ unsigned int freq = table[i].frequency;
+ if (freq == CPUFREQ_ENTRY_INVALID)
+ continue;
+ if (freq < min_freq)
+ min_freq = freq;
+ if (freq > max_freq)
+ max_freq = freq;
+ }
+
+ policy->min = policy->cpuinfo.min_freq = min_freq;
+ policy->max = policy->cpuinfo.max_freq = max_freq;
+
+ if (policy->min == ~0)
+ return -EINVAL;
+ else
+ return 0;
+}
+
+int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
+ struct cpufreq_frequency_table *table,
+ unsigned int target_freq,
+ unsigned int relation,
+ unsigned int *index)
+{
+ struct cpufreq_frequency_table optimal = {
+ .index = ~0,
+ .frequency = 0,
+ };
+ struct cpufreq_frequency_table suboptimal = {
+ .index = ~0,
+ .frequency = 0,
+ };
+ unsigned int i;
+
+ switch (relation) {
+ case CPUFREQ_RELATION_H:
+ suboptimal.frequency = ~0;
+ break;
+ case CPUFREQ_RELATION_L:
+ optimal.frequency = ~0;
+ break;
+ }
+
+ if (!cpu_online(policy->cpu))
+ return -EINVAL;
+
+ for (i=0; (table[i].frequency != CPUFREQ_TABLE_END); i++) {
+ unsigned int freq = table[i].frequency;
+ if (freq == CPUFREQ_ENTRY_INVALID)
+ continue;
+ if ((freq < policy->min) || (freq > policy->max))
+ continue;
+ switch(relation) {
+ case CPUFREQ_RELATION_H:
+ if (freq <= target_freq) {
+ if (freq >= optimal.frequency) {
+ optimal.frequency = freq;
+ optimal.index = i;
+ }
+ } else {
+ if (freq <= suboptimal.frequency) {
+ suboptimal.frequency = freq;
+ suboptimal.index = i;
+ }
+ }
+ break;
+ case CPUFREQ_RELATION_L:
+ if (freq >= target_freq) {
+ if (freq <= optimal.frequency) {
+ optimal.frequency = freq;
+ optimal.index = i;
+ }
+ } else {
+ if (freq >= suboptimal.frequency) {
+ suboptimal.frequency = freq;
+ suboptimal.index = i;
+ }
+ }
+ break;
+ }
+ }
+ if (optimal.index > i) {
+ if (suboptimal.index > i)
+ return -EINVAL;
+ *index = suboptimal.index;
+ } else
+ *index = optimal.index;
+
+ return 0;
+}
+
+
+/*********************************************************************
+ * GOVERNORS *
+ *********************************************************************/
+
+int __cpufreq_driver_target(struct cpufreq_policy *policy,
+ unsigned int target_freq,
+ unsigned int relation)
+{
+ int retval = -EINVAL;
+
+ if (cpu_online(policy->cpu) && cpufreq_driver->target)
+ retval = cpufreq_driver->target(policy, target_freq, relation);
+
+ return retval;
+}
+
+int __cpufreq_driver_getavg(struct cpufreq_policy *policy)
+{
+ int ret = 0;
+
+ if (!policy)
+ return -EINVAL;
+
+ if (cpu_online(policy->cpu) && cpufreq_driver->getavg)
+ ret = cpufreq_driver->getavg(policy->cpu);
+
+ return ret;
+}
diff -r 66ddfc4d6963 -r 50fb7620d05a xen/include/acpi/cpufreq/cpufreq.h
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/xen/include/acpi/cpufreq/cpufreq.h Wed May 14 13:55:11 2008 +0100
@@ -0,0 +1,129 @@
+/*
+ * xen/include/acpi/cpufreq/cpufreq.h
+ *
+ * Copyright (C) 2001 Russell King
+ * (C) 2002 - 2003 Dominik Brodowski <linux@xxxxxxxx>
+ *
+ * $Id: cpufreq.h,v 1.36 2003/01/20 17:31:48 db Exp $
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <xen/types.h>
+#include <xen/list.h>
+#include <xen/cpumask.h>
+
+#include "processor_perf.h"
+
+#define CPUFREQ_NAME_LEN 16
+
+struct cpufreq_cpuinfo {
+ unsigned int max_freq;
+ unsigned int min_freq;
+ unsigned int transition_latency; /* in 10^(-9) s = nanoseconds */
+};
+
+struct cpufreq_policy {
+ cpumask_t cpus; /* affected CPUs */
+ unsigned int shared_type; /* ANY or ALL affected CPUs
+ should set cpufreq */
+ unsigned int cpu; /* cpu nr of registered CPU */
+ struct cpufreq_cpuinfo cpuinfo; /* see above */
+
+ unsigned int min; /* in kHz */
+ unsigned int max; /* in kHz */
+ unsigned int cur; /* in kHz, only needed if cpufreq
+ * governors are used */
+};
+
+#define CPUFREQ_SHARED_TYPE_NONE (0) /* None */
+#define CPUFREQ_SHARED_TYPE_HW (1) /* HW does needed coordination */
+#define CPUFREQ_SHARED_TYPE_ALL (2) /* All dependent CPUs should set freq */
+#define CPUFREQ_SHARED_TYPE_ANY (3) /* Freq can be set from any dependent
CPU*/
+
+/******************** cpufreq transition notifiers *******************/
+
+struct cpufreq_freqs {
+ unsigned int cpu; /* cpu nr */
+ unsigned int old;
+ unsigned int new;
+ u8 flags; /* flags of cpufreq_driver, see below. */
+};
+
+
+/*********************************************************************
+ * CPUFREQ GOVERNORS *
+ *********************************************************************/
+
+#define CPUFREQ_GOV_START 1
+#define CPUFREQ_GOV_STOP 2
+#define CPUFREQ_GOV_LIMITS 3
+
+/* pass a target to the cpufreq driver */
+extern int __cpufreq_driver_target(struct cpufreq_policy *policy,
+ unsigned int target_freq,
+ unsigned int relation);
+extern int __cpufreq_driver_getavg(struct cpufreq_policy *policy);
+
+
+/*********************************************************************
+ * CPUFREQ DRIVER INTERFACE *
+ *********************************************************************/
+
+#define CPUFREQ_RELATION_L 0 /* lowest frequency at or above target */
+#define CPUFREQ_RELATION_H 1 /* highest frequency below or at target */
+
+struct cpufreq_driver {
+ int (*init)(struct cpufreq_policy *policy);
+ int (*verify)(struct cpufreq_policy *policy);
+ int (*target)(struct cpufreq_policy *policy,
+ unsigned int target_freq,
+ unsigned int relation);
+ unsigned int (*get)(unsigned int cpu);
+ unsigned int (*getavg)(unsigned int cpu);
+ int (*exit)(struct cpufreq_policy *policy);
+};
+
+extern struct cpufreq_driver *cpufreq_driver;
+
+void cpufreq_notify_transition(struct cpufreq_freqs *freqs, unsigned int
state);
+
+/*********************************************************************
+ * FREQUENCY TABLE HELPERS *
+ *********************************************************************/
+
+#define CPUFREQ_ENTRY_INVALID ~0
+#define CPUFREQ_TABLE_END ~1
+
+struct cpufreq_frequency_table {
+ unsigned int index; /* any */
+ unsigned int frequency; /* kHz - doesn't need to be in ascending
+ * order */
+};
+
+int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
+ struct cpufreq_frequency_table *table);
+
+int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
+ struct cpufreq_frequency_table *table,
+ unsigned int target_freq,
+ unsigned int relation,
+ unsigned int *index);
+
+
+/*********************************************************************
+ * UNIFIED DEBUG HELPERS *
+ *********************************************************************/
+
+struct cpu_dbs_info_s {
+ uint64_t prev_cpu_idle;
+ uint64_t prev_cpu_wall;
+ struct cpufreq_policy *cur_policy;
+ struct cpufreq_frequency_table *freq_table;
+ int cpu;
+ unsigned int enable:1;
+};
+
+int cpufreq_governor_dbs(struct cpufreq_policy *policy, unsigned int event);
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