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Subject[PATCH][2.5.32] CPUfreq core (1/4)
CPUFreq core for 2.5.32
include/linux/cpufreq.h CPUFreq header
include/linux/sysctl.h /proc/sys/cpu/.../ enumeration
kernel/Makefile add cpufreq.c if necessary
kernel/cpufreq.c CPUFreq core
kernel/sysctl.c /proc/sys/cpu/.../ enumeration
# unfortunately no #for() preprocessor call exists...

diff -ruN linux-2531orig/include/linux/cpufreq.h linux/include/linux/cpufreq.h
--- linux-2531orig/include/linux/cpufreq.h Thu Jan 1 01:00:00 1970
+++ linux/include/linux/cpufreq.h Wed Aug 28 10:11:50 2002
@@ -0,0 +1,142 @@
+/*
+ * linux/include/linux/cpufreq.h
+ *
+ * Copyright (C) 2001 Russell King
+ * (C) 2002 Dominik Brodowski <devel@brodo.de>
+ *
+ *
+ * $Id: cpufreq.h,v 1.13 2002/08/22 22:48:47 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.
+ */
+#ifndef _LINUX_CPUFREQ_H
+#define _LINUX_CPUFREQ_H
+
+#include <linux/config.h>
+#include <linux/notifier.h>
+
+
+/* sysctl ctl_table entries */
+#define CTL_CPU_VARS_SPEED_MAX(cpunr) { \
+ ctl_name: CPU_NR_FREQ_MAX, \
+ procname: "speed-max", \
+ mode: 0444, \
+ proc_handler: cpufreq_procctl_max, \
+ extra1: (void*) (cpunr), }
+
+#define CTL_CPU_VARS_SPEED_MIN(cpunr) { \
+ ctl_name: CPU_NR_FREQ_MIN, \
+ procname: "speed-min", \
+ mode: 0444, \
+ proc_handler: cpufreq_procctl_min, \
+ extra1: (void*) (cpunr), }
+
+#define CTL_CPU_VARS_SPEED(cpunr) { \
+ ctl_name: CPU_NR_FREQ_MIN, \
+ procname: "speed", \
+ mode: 0644, \
+ proc_handler: cpufreq_procctl, \
+ strategy: cpufreq_sysctl, \
+ extra1: (void*) (cpunr), }
+
+#define CTL_CPU_VARS_SPEED_SYNC { \
+ ctl_name: CPU_NR_FREQ_SYNC, \
+ procname: "speed-sync", \
+ mode: 0444, \
+ proc_handler: cpufreq_procctl_sync }
+
+/* speed setting interface */
+
+int cpufreq_setmax(unsigned int cpu);
+int cpufreq_set(unsigned int cpu, unsigned int khz);
+unsigned int cpufreq_get(unsigned int cpu);
+
+#ifdef CONFIG_PM
+int cpufreq_restore(void);
+#endif
+
+
+/* notifier interface */
+
+/*
+ * The max and min frequency rates that the registered device
+ * can tolerate. Never set any element this structure directly -
+ * always use cpufreq_updateminmax.
+ */
+struct cpufreq_freqs {
+ unsigned int cpu;
+ unsigned int min;
+ unsigned int max;
+ unsigned int cur;
+ unsigned int new;
+};
+
+static inline
+void cpufreq_updateminmax(struct cpufreq_freqs *freq,
+ unsigned int min,
+ unsigned int max)
+{
+ if (freq->min < min)
+ freq->min = min;
+ if (freq->max > max)
+ freq->max = max;
+}
+
+/**
+ * cpufreq_scale - "old * mult / div" calculation for large values (32-bit-arch safe)
+ * @old: old value
+ * @div: divisor
+ * @mult: multiplier
+ *
+ * Needed for loops_per_jiffy and similar calculations. We do it
+ * this way to avoid math overflow on 32-bit machines. This will
+ * become architecture dependent once high-resolution-timer is
+ * merged (or any other thing that introduces sc_math.h).
+ *
+ * new = old * mult / div
+ */
+static inline unsigned long cpufreq_scale(unsigned long old, u_int div, u_int mult)
+{
+ unsigned long val, carry;
+
+ mult /= 100;
+ div /= 100;
+ val = (old / div) * mult;
+ carry = old % div;
+ carry = carry * mult / div;
+
+ return carry + val;
+}
+
+#define CPUFREQ_MINMAX (0)
+#define CPUFREQ_PRECHANGE (1)
+#define CPUFREQ_POSTCHANGE (2)
+
+#define CPUFREQ_ALL_CPUS (60000)
+
+int cpufreq_register_notifier(struct notifier_block *nb);
+int cpufreq_unregister_notifier(struct notifier_block *nb);
+
+
+
+/* cpufreq driver interface */
+
+typedef unsigned int (*cpufreq_verify_t) (unsigned int cpu, unsigned int kHz);
+typedef void (*cpufreq_setspeed_t) (unsigned int cpu, unsigned int kHz);
+
+struct cpufreq_driver {
+ struct cpufreq_freqs *freq;
+ cpufreq_verify_t validate;
+ cpufreq_setspeed_t setspeed;
+ unsigned int sync; /* synchronized frequencies */
+};
+
+#define CPUFREQ_SYNC 1 /* all CPUs need to run the same frequency */
+#define CPUFREQ_ASYNC 0 /* all CPUs can have different frequencies */
+
+int cpufreq_register(struct cpufreq_driver *driver_data);
+int cpufreq_unregister(void);
+
+#endif
diff -ruN linux-2531orig/include/linux/sysctl.h linux/include/linux/sysctl.h
--- linux-2531orig/include/linux/sysctl.h Wed Aug 28 10:01:01 2002
+++ linux/include/linux/sysctl.h Wed Aug 28 10:13:03 2002
@@ -631,6 +631,78 @@
ABI_FAKE_UTSNAME=6, /* fake target utsname information */
};

+/* /proc/sys/cpu */
+enum {
+ CPU_NR = 1, /* compatibilty reasons */
+ CPU_NR_0 = 1,
+ CPU_NR_1 = 2,
+ CPU_NR_2 = 3,
+ CPU_NR_3 = 4,
+ CPU_NR_4 = 5,
+ CPU_NR_5 = 6,
+ CPU_NR_6 = 7,
+ CPU_NR_7 = 8,
+ CPU_NR_8 = 9,
+ CPU_NR_9 = 10,
+ CPU_NR_10 = 11,
+ CPU_NR_11 = 12,
+ CPU_NR_12 = 13,
+ CPU_NR_13 = 14,
+ CPU_NR_14 = 15,
+ CPU_NR_15 = 16,
+ CPU_NR_16 = 17,
+ CPU_NR_17 = 18,
+ CPU_NR_18 = 19,
+ CPU_NR_19 = 20,
+ CPU_NR_20 = 21,
+ CPU_NR_21 = 22,
+ CPU_NR_22 = 23,
+ CPU_NR_23 = 24,
+ CPU_NR_24 = 25,
+ CPU_NR_25 = 26,
+ CPU_NR_26 = 27,
+ CPU_NR_27 = 28,
+ CPU_NR_28 = 29,
+ CPU_NR_29 = 30,
+ CPU_NR_30 = 31,
+ CPU_NR_31 = 32,
+};
+
+/* /proc/sys/cpu/{0,1,...,(NR_CPUS-1)} */
+enum {
+ CPU_NR_FREQ_MAX = 1,
+ CPU_NR_FREQ_MIN = 2,
+ CPU_NR_FREQ = 3,
+ CPU_NR_FREQ_SYNC = 4
+};
+
+
+/* for the CPU enumeration we need some more definitions */
+/* include macros */
+#ifdef CONFIG_CPU_FREQ
+#include <linux/cpufreq.h>
+#define CTL_CPU_VARS_CPUFREQ(cpunr) CTL_CPU_VARS_SPEED_MAX(cpunr), \
+ CTL_CPU_VARS_SPEED_MIN(cpunr), \
+ CTL_CPU_VARS_SPEED(cpunr), \
+ CTL_CPU_VARS_SPEED_SYNC,
+#else
+#define CTL_CPU_VARS_CPUFREQ(cpunr)
+#endif
+
+/* one ctl_table_vars_{0,1,...,(NR_CPUS-1)} for each CPU - this is only the
+ * macro for the definitions in kernel/sysctl.c */
+#define CTL_TABLE_CPU_VARS(cpunr) static ctl_table ctl_cpu_vars_##cpunr[] = {\
+ CTL_CPU_VARS_CPUFREQ(cpunr)\
+ { ctl_name: 0, }, }
+
+/* the ctl_table entry for each CPU - kernel/sysctl.c */
+#define CPU_ENUM(s) { \
+ ctl_name: (CPU_NR + s), \
+ procname: #s, \
+ mode: 0555, \
+ child: ctl_cpu_vars_##s }
+
+
#ifdef __KERNEL__

extern asmlinkage long sys_sysctl(struct __sysctl_args *);
diff -ruN linux-2531orig/kernel/Makefile linux/kernel/Makefile
--- linux-2531orig/kernel/Makefile Wed Aug 28 10:01:11 2002
+++ linux/kernel/Makefile Wed Aug 28 10:19:20 2002
@@ -10,7 +10,7 @@
O_TARGET := kernel.o

export-objs = signal.o sys.o kmod.o context.o ksyms.o pm.o exec_domain.o \
- printk.o platform.o suspend.o dma.o
+ printk.o platform.o suspend.o dma.o cpufreq.o

obj-y = sched.o fork.o exec_domain.o panic.o printk.o \
module.o exit.o itimer.o time.o softirq.o resource.o \
@@ -22,6 +22,7 @@
obj-$(CONFIG_UID16) += uid16.o
obj-$(CONFIG_MODULES) += ksyms.o
obj-$(CONFIG_PM) += pm.o
+obj-$(CONFIG_CPU_FREQ) += cpufreq.o
obj-$(CONFIG_BSD_PROCESS_ACCT) += acct.o
obj-$(CONFIG_SOFTWARE_SUSPEND) += suspend.o

diff -ruN linux-2531orig/kernel/cpufreq.c linux/kernel/cpufreq.c
--- linux-2531orig/kernel/cpufreq.c Thu Jan 1 01:00:00 1970
+++ linux/kernel/cpufreq.c Wed Aug 28 10:12:05 2002
@@ -0,0 +1,709 @@
+/*
+ * linux/kernel/cpufreq.c
+ *
+ * Copyright (C) 2001 Russell King
+ * (C) 2002 Dominik Brodowski <devel@brodo.de>
+ *
+ * $Id: cpufreq.c,v 1.33 2002/08/17 11:45:22 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.
+ *
+ * CPU speed changing core functionality. We provide the following
+ * services to the system:
+ * - notifier lists to inform other code of the freq change both
+ * before and after the freq change.
+ * - the ability to change the freq speed
+ */
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/module.h>
+#include <linux/notifier.h>
+#include <linux/cpufreq.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/smp.h>
+#include <linux/fs.h>
+#include <linux/sysctl.h>
+#include <linux/slab.h>
+
+#include <asm/semaphore.h>
+#include <asm/system.h>
+#include <asm/uaccess.h>
+#include <linux/interrupt.h> /* requires system.h */
+
+
+/*
+ * This list is for kernel code that needs to handle
+ * changes to devices when the CPU clock speed changes.
+ */
+static struct notifier_block *cpufreq_notifier_list;
+static DECLARE_MUTEX (cpufreq_notifier_sem);
+
+/*
+ * This is internal information about the actual transition
+ * driver.
+ */
+static struct cpufreq_driver *cpufreq_driver;
+static struct cpufreq_freqs cpufreq_freq_limit;
+static DECLARE_MUTEX (cpufreq_driver_sem);
+
+/*
+ * Some data for the CPUFreq core - loops_per_jiffy / frequency values at boot
+ */
+static unsigned long cpufreq_ref_loops;
+static unsigned int cpufreq_ref_freq;
+
+
+
+
+
+/**
+ * cpufreq_setup - cpufreq command line parameter parsing
+ *
+ * cpufreq command line parameter. Use:
+ * cpufreq=59000-221000
+ * to set the CPU frequency to 59 to 221MHz.
+ */
+static int __init cpufreq_setup(char *str)
+{
+ unsigned int min, max;
+
+ min = 0;
+ max = simple_strtoul(str, &str, 0);
+ if (*str == '-') {
+ min = max;
+ max = simple_strtoul(str + 1, NULL, 0);
+ }
+
+ down(&cpufreq_driver_sem);
+ cpufreq_freq_limit.max = max;
+ cpufreq_freq_limit.min = min;
+ up(&cpufreq_driver_sem);
+
+ return 1;
+}
+__setup("cpufreq=", cpufreq_setup);
+
+
+/**
+ * adjust_jiffies - adjust the system "loops_per_jiffy"
+ *
+ * This function alters the system "loops_per_jiffy" for the clock
+ * speed change. Note that loops_per_jiffy is only valid for the
+ * _fastest_ CPU. It is not meant to be an accurate value. Drivers
+ * should rely on ?delay() calls instead, architectures might have
+ * per-CPU loops_per_jiffy values.
+ */
+static void adjust_jiffies(unsigned long val, struct cpufreq_freqs *ci)
+{
+ /* adjust_jiffies is called with cpufreq_driver locked */
+ if ((val == CPUFREQ_PRECHANGE && ci->cur < ci->new) ||
+ (val == CPUFREQ_POSTCHANGE && ci->cur > ci->new)) {
+ if (cpufreq_driver->sync == CPUFREQ_SYNC)
+ loops_per_jiffy = cpufreq_scale(cpufreq_ref_loops, cpufreq_ref_freq,
+ ci->new);
+ else {
+ int i;
+ unsigned int highest_freq = 0;
+ for (i=0;i<NR_CPUS;i++)
+ if (cpufreq_driver->freq[i].cur > highest_freq)
+ highest_freq = cpufreq_driver->freq[i].cur;
+ if (ci->new > highest_freq)
+ highest_freq = ci->new;
+ loops_per_jiffy = cpufreq_scale(cpufreq_ref_loops, cpufreq_ref_freq, highest_freq);
+ }
+ }
+}
+
+
+
+/*********************************************************************
+ * NOTIFIER LIST INTERFACE *
+ *********************************************************************/
+
+
+/**
+ * cpufreq_register_notifier - register a driver with cpufreq
+ * @nb: notifier function to register
+ *
+ * Add a driver to the list of drivers that which to be notified about
+ * CPU clock rate changes. The driver will be called three times on
+ * clock change.
+ *
+ * This function may sleep, and has the same return conditions as
+ * notifier_chain_register.
+ */
+int cpufreq_register_notifier(struct notifier_block *nb)
+{
+ int ret;
+
+ down(&cpufreq_notifier_sem);
+ ret = notifier_chain_register(&cpufreq_notifier_list, nb);
+ up(&cpufreq_notifier_sem);
+
+ return ret;
+}
+EXPORT_SYMBOL(cpufreq_register_notifier);
+
+
+/**
+ * cpufreq_unregister_notifier - unregister a driver with cpufreq
+ * @nb: notifier block to be unregistered
+ *
+ * Remove a driver from the CPU frequency notifier lists.
+ *
+ * This function may sleep, and has the same return conditions as
+ * notifier_chain_unregister.
+ */
+int cpufreq_unregister_notifier(struct notifier_block *nb)
+{
+ int ret;
+
+ down(&cpufreq_notifier_sem);
+ ret = notifier_chain_unregister(&cpufreq_notifier_list, nb);
+ up(&cpufreq_notifier_sem);
+
+ return ret;
+}
+EXPORT_SYMBOL(cpufreq_unregister_notifier);
+
+
+
+/*********************************************************************
+ * GET / SET PROCESSOR SPEED *
+ *********************************************************************/
+
+/**
+ * cpu_setfreq - change the CPU clock frequency.
+ * @freq: frequency (in kHz) at which we should run.
+ *
+ * Set the CPU clock frequency, informing all registered users of
+ * the change. We bound the frequency according to the cpufreq
+ * command line parameter, information obtained from the cpufreq
+ * driver, and the parameters the registered users will allow.
+ *
+ * This function must be called from process context.
+ *
+ * We return 0 if successful, -EINVAL if no CPUFreq architecture
+ * driver is registered, and -ENXIO if the driver is invalid.
+ */
+int cpufreq_set(unsigned int cpu, unsigned int freq)
+{
+ struct cpufreq_freqs cpufreq;
+ int ret;
+
+ if (in_interrupt())
+ panic("cpufreq_set() called from interrupt context!");
+
+ down(&cpufreq_driver_sem);
+ down(&cpufreq_notifier_sem);
+
+ if (!cpufreq_driver) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ ret = -ENXIO;
+ if (!cpufreq_driver->setspeed || !cpufreq_driver->validate)
+ goto out;
+
+ /*
+ * Don't allow the CPU to be clocked over the limit.
+ */
+ if (cpufreq_driver->sync == CPUFREQ_SYNC) {
+ cpufreq.cpu = CPUFREQ_ALL_CPUS;
+ cpu = 0;
+ } else {
+ if (cpu >= NR_CPUS) {
+ ret = -EINVAL;
+ goto out;
+ }
+ cpufreq.cpu = cpu;
+ }
+ cpufreq.min = cpufreq_driver->freq[cpu].min;
+ cpufreq.max = cpufreq_driver->freq[cpu].max;
+ cpufreq.cur = cpufreq_driver->freq[cpu].cur;
+ cpufreq.new = freq;
+
+
+ /*
+ * Find out what the registered devices will currently tolerate,
+ * and limit the requested clock rate to these values. Drivers
+ * must not rely on the 'new' value - it is only a guide.
+ */
+ notifier_call_chain(&cpufreq_notifier_list, CPUFREQ_MINMAX, &cpufreq);
+
+ if (freq < cpufreq.min)
+ freq = cpufreq.min;
+ if (freq > cpufreq.max)
+ freq = cpufreq.max;
+
+ /*
+ * Ask the CPU specific code to validate the speed. If the speed
+ * is not acceptable, make it acceptable. Current policy is to
+ * round the frequency down to the value the processor actually
+ * supports.
+ */
+ freq = cpufreq_driver->validate(cpu, freq);
+
+ if (cpufreq_driver->freq[cpu].cur != freq) {
+ cpufreq.cur = cpufreq_driver->freq[cpu].cur;
+ cpufreq.new = freq;
+
+ notifier_call_chain(&cpufreq_notifier_list, CPUFREQ_PRECHANGE,
+ &cpufreq);
+
+ adjust_jiffies(CPUFREQ_PRECHANGE, &cpufreq);
+
+ /*
+ * Actually set the CPU frequency.
+ */
+ preempt_disable();
+ cpufreq_driver->setspeed(cpu, freq);
+ preempt_enable();
+ cpufreq_driver->freq[cpu].cur = freq;
+ adjust_jiffies(CPUFREQ_POSTCHANGE, &cpufreq);
+
+ notifier_call_chain(&cpufreq_notifier_list, CPUFREQ_POSTCHANGE,
+ &cpufreq);
+
+ ret = 0;
+ }
+
+ out:
+ up(&cpufreq_notifier_sem);
+ up(&cpufreq_driver_sem);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(cpufreq_set);
+
+
+/**
+ * cpufreq_setmax - set the CPU to maximum frequency
+ * @cpu: the CPU affected by this call
+ *
+ * Sets the CPUs to maximum frequency.
+ */
+int cpufreq_setmax(unsigned int cpu)
+{
+ unsigned int max_freq = 0;
+
+ down(&cpufreq_driver_sem);
+ if (!cpufreq_driver) {
+ up(&cpufreq_driver_sem);
+ return -EINVAL;
+ }
+ if (cpufreq_driver->sync == CPUFREQ_SYNC)
+ max_freq = cpufreq_driver->freq->max;
+ else if (cpu < NR_CPUS)
+ max_freq = cpufreq_driver->freq[cpu].max;
+
+ up(&cpufreq_driver_sem);
+ return cpufreq_set(cpu, max_freq);
+}
+EXPORT_SYMBOL_GPL(cpufreq_setmax);
+
+
+/**
+ * cpufreq_get - get the CPU frequency in kHz (zero means failure)
+ * @cpu: number of the CPU this inquiry is made for
+ *
+ * Returns the CPU frequency in kHz or zero on failure.
+ */
+unsigned int cpufreq_get(unsigned int cpu)
+{
+ unsigned int current_freq = 0;
+
+ down(&cpufreq_driver_sem);
+ if (!cpufreq_driver) {
+ up(&cpufreq_driver_sem);
+ return 0;
+ }
+
+ if (cpufreq_driver->sync == CPUFREQ_SYNC)
+ current_freq = cpufreq_driver->freq->cur;
+ else if (cpu < NR_CPUS)
+ current_freq = cpufreq_driver->freq[cpu].max;
+
+ up(&cpufreq_driver_sem);
+ return current_freq;
+}
+EXPORT_SYMBOL(cpufreq_get);
+
+
+#ifdef CONFIG_PM
+/**
+ * cpufreq_restore - restore the CPU clock frequency after resume
+ *
+ * Restore the CPU clock frequency so that our idea of the current
+ * frequency reflects the actual hardware.
+ */
+int cpufreq_restore(void)
+{
+ int ret = 0;
+
+ if (in_interrupt())
+ panic("cpufreq_restore() called from interrupt context!");
+
+ down(&cpufreq_driver_sem);
+ if (!cpufreq_driver) {
+ up(&cpufreq_driver_sem);
+ return -EINVAL;
+ }
+ ret = -ENXIO;
+ if (cpufreq_driver->setspeed) {
+ if (cpufreq_driver->sync == CPUFREQ_SYNC)
+ cpufreq_driver->setspeed(0, cpufreq_driver->freq->cur);
+ else {
+ int i;
+ for (i=0; i < NR_CPUS; i++)
+ cpufreq_driver->setspeed(i, cpufreq_driver->freq[i].cur);
+ }
+ ret = 0;
+ }
+
+ up(&cpufreq_driver_sem);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(cpufreq_restore);
+#endif
+
+
+
+/*********************************************************************
+ * SYSCTL INTERFACE *
+ *********************************************************************/
+
+#ifdef CONFIG_SYSCTL
+
+struct ctl_table_header *cpufreq_sysctl_table;
+
+int
+cpufreq_procctl_min(ctl_table *ctl, int write, struct file *filp,
+ void *buffer, size_t *lenp)
+{
+ char buf[16];
+ int len, left = *lenp;
+ unsigned int printout = -1;
+
+ if (!left || write || filp->f_pos) {
+ *lenp = 0;
+ return 0;
+ }
+ down(&cpufreq_driver_sem);
+ if (!cpufreq_driver)
+ printout = cpufreq_freq_limit.min;
+ else {
+ if (cpufreq_driver->sync == CPUFREQ_SYNC)
+ printout = cpufreq_driver->freq->min;
+ else if (((int) ctl->extra1) < NR_CPUS)
+ printout = cpufreq_driver->freq[(int) ctl->extra1].min;
+ }
+ up(&cpufreq_driver_sem);
+
+ len = sprintf(buf, "%d\n", printout);
+ if (len > left)
+ len = left;
+ if (copy_to_user(buffer, buf, len))
+ return -EFAULT;
+
+ *lenp = len;
+ filp->f_pos += len;
+ return 0;
+}
+
+
+int
+cpufreq_procctl_max(ctl_table *ctl, int write, struct file *filp,
+ void *buffer, size_t *lenp)
+{
+ char buf[16];
+ int len, left = *lenp;
+ unsigned int printout = -1;
+
+ if (!left || write || filp->f_pos) {
+ *lenp = 0;
+ return 0;
+ }
+
+ down(&cpufreq_driver_sem);
+ if (!cpufreq_driver)
+ printout = cpufreq_freq_limit.max;
+ else {
+ if (cpufreq_driver->sync == CPUFREQ_SYNC)
+ printout = cpufreq_driver->freq->max;
+ else if (((int) ctl->extra1) < NR_CPUS)
+ printout = cpufreq_driver->freq[(int) ctl->extra1].max;
+ }
+ up(&cpufreq_driver_sem);
+
+ len = sprintf(buf, "%d\n", printout);
+ if (len > left)
+ len = left;
+ if (copy_to_user(buffer, buf, len))
+ return -EFAULT;
+
+ *lenp = len;
+ filp->f_pos += len;
+ return 0;
+}
+
+
+int
+cpufreq_procctl_sync(ctl_table *ctl, int write, struct file *filp,
+ void *buffer, size_t *lenp)
+{
+ char buf[16];
+ int len, left = *lenp;
+ unsigned int printout = 0;
+
+ if (!left || write || filp->f_pos) {
+ *lenp = 0;
+ return 0;
+ }
+
+ down(&cpufreq_driver_sem);
+ if (!cpufreq_driver)
+ printout = -1;
+ else
+ printout = cpufreq_driver->sync;
+ up(&cpufreq_driver_sem);
+
+ len = sprintf(buf, "%d\n", printout);
+ if (len > left)
+ len = left;
+ if (copy_to_user(buffer, buf, len))
+ return -EFAULT;
+
+ *lenp = len;
+ filp->f_pos += len;
+ return 0;
+}
+
+
+int
+cpufreq_procctl(ctl_table *ctl, int write, struct file *filp,
+ void *buffer, size_t *lenp)
+{
+ char buf[16], *p;
+ int len, left = *lenp;
+ unsigned int cpu = 0;
+
+ if (!left || (filp->f_pos && !write)) {
+ *lenp = 0;
+ return 0;
+ }
+
+ if (write) {
+ unsigned int freq;
+
+ len = left;
+ if (left > sizeof(buf))
+ left = sizeof(buf);
+ if (copy_from_user(buf, buffer, left))
+ return -EFAULT;
+ buf[sizeof(buf) - 1] = '\0';
+
+ freq = simple_strtoul(buf, &p, 0);
+ down(&cpufreq_driver_sem);
+ if (!cpufreq_driver) {
+ up(&cpufreq_driver_sem);
+ return -EINVAL;
+ }
+ if (cpufreq_driver->sync == CPUFREQ_SYNC)
+ cpu = CPUFREQ_ALL_CPUS;
+ else
+ cpu = (int) ctl->extra1;
+ up(&cpufreq_driver_sem);
+ cpufreq_set(cpu, freq);
+ } else {
+ down(&cpufreq_driver_sem);
+ if (!cpufreq_driver) {
+ up(&cpufreq_driver_sem);
+ return -EINVAL;
+ }
+ if (cpufreq_driver->sync == CPUFREQ_SYNC)
+ cpu = CPUFREQ_ALL_CPUS;
+ else
+ cpu = (int) ctl->extra1;
+ up(&cpufreq_driver_sem);
+
+ len = sprintf(buf, "%d\n", cpufreq_get(cpu));
+ if (len > left)
+ len = left;
+ if (copy_to_user(buffer, buf, len))
+ return -EFAULT;
+ }
+
+ *lenp = len;
+ filp->f_pos += len;
+ return 0;
+}
+
+int
+cpufreq_sysctl(ctl_table *table, int *name, int nlen,
+ void *oldval, size_t *oldlenp,
+ void *newval, size_t newlen, void **context)
+{
+ unsigned int cpu = 0;
+
+ if (oldval && oldlenp) {
+ size_t oldlen;
+
+ if (get_user(oldlen, oldlenp))
+ return -EFAULT;
+
+ if (oldlen != sizeof(unsigned int))
+ return -EINVAL;
+
+ down(&cpufreq_driver_sem);
+ if (!cpufreq_driver) {
+ up(&cpufreq_driver_sem);
+ return -EINVAL;
+ }
+ if (cpufreq_driver->sync == CPUFREQ_SYNC)
+ cpu = CPUFREQ_ALL_CPUS;
+ else
+ cpu = (int) table->extra1;
+ up(&cpufreq_driver_sem);
+
+ if (put_user(cpufreq_get(cpu), (unsigned int *)oldval) ||
+ put_user(sizeof(unsigned int), oldlenp))
+ return -EFAULT;
+ }
+ if (newval && newlen) {
+ unsigned int freq;
+
+ if (newlen != sizeof(unsigned int))
+ return -EINVAL;
+
+ if (get_user(freq, (unsigned int *)newval))
+ return -EFAULT;
+
+ down(&cpufreq_driver_sem);
+ if (!cpufreq_driver) {
+ up(&cpufreq_driver_sem);
+ return -EINVAL;
+ }
+ if (cpufreq_driver->sync == CPUFREQ_SYNC)
+ cpu = CPUFREQ_ALL_CPUS;
+ else
+ cpu = (int) table->extra1;
+ up(&cpufreq_driver_sem);
+
+ cpufreq_set(cpu, freq);
+ }
+ return 1;
+}
+
+#endif
+
+
+
+
+/*********************************************************************
+ * REGISTER / UNREGISTER CPUFREQ DRIVER *
+ *********************************************************************/
+
+
+/**
+ * cpufreq_register - register a CPU Frequency driver
+ * @driver_data: A struct cpufreq_driver containing the values submitted by the CPU Frequency driver.
+ *
+ * driver_data should contain the following elements:
+ * freq.min is the minimum frequency the CPU / the CPUs can be set to
+ * (optional), freq.max is the maximum frequency (optional), freq.cur
+ * is the current frequency, validate points to a function returning
+ * the closest available CPU frequency, and setspeed points to a
+ * function performing the actual transition.
+ *
+ * All other variables are currently ignored.
+ *
+ *
+ * Registers a CPU Frequency driver to this core code. This code
+ * returns zero on success, -EBUSY when another driver got here first
+ * (and isn't unregistered in the meantime).
+ *
+ */
+int cpufreq_register(struct cpufreq_driver *driver_data)
+{
+ int i, j;
+
+ if (cpufreq_driver)
+ return -EBUSY;
+
+ if (!driver_data || !driver_data->freq)
+ return -EINVAL;
+
+ down(&cpufreq_driver_sem);
+
+ cpufreq_driver = driver_data;
+
+ /*
+ * If the user doesn't tell us the maximum frequency,
+ * or if it is invalid, use the values determined
+ * by the cpufreq-arch-specific initialization functions.
+ * The validatespeed code is responsible for limiting
+ * this further.
+ */
+
+ if (cpufreq_driver->sync == CPUFREQ_SYNC)
+ j = 1;
+ else
+ j = NR_CPUS;
+ for (i=0; i<j; i++) {
+ if (!cpufreq_driver->freq[i].max ||
+ (cpufreq_freq_limit.max &&
+ (cpufreq_freq_limit.max < cpufreq_driver->freq[i].max)))
+ cpufreq_driver->freq[i].max = cpufreq_freq_limit.max;
+
+ if (!cpufreq_driver->freq[i].min ||
+ (cpufreq_driver->freq[i].min < cpufreq_freq_limit.min))
+ cpufreq_driver->freq[i].min = cpufreq_freq_limit.min;
+
+ cpufreq_ref_loops = loops_per_jiffy;
+ cpufreq_ref_freq = cpufreq_driver->freq->cur;
+ }
+
+ printk(KERN_INFO "CPU clock: %d.%03d MHz (%d.%03d-%d.%03d MHz)\n",
+ cpufreq_driver->freq[0].cur / 1000, cpufreq_driver->freq[0].cur % 1000,
+ cpufreq_driver->freq[0].min / 1000, cpufreq_driver->freq[0].min % 1000,
+ cpufreq_driver->freq[0].max / 1000, cpufreq_driver->freq[0].max % 1000);
+
+ up(&cpufreq_driver_sem);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(cpufreq_register);
+
+
+/**
+ * cpufreq_unregister:
+ *
+ * Unregister the current CPUFreq driver. Only call this if you have
+ * the right to do so, i.e. if you have succeeded in initialising before!
+ * Returns zero if successful, and -EINVAL if the cpufreq_driver is
+ * currently not initialised.
+ */
+int cpufreq_unregister(void)
+{
+ down(&cpufreq_driver_sem);
+
+ if (!cpufreq_driver) {
+ up(&cpufreq_driver_sem);
+ return -EINVAL;
+ }
+
+ cpufreq_driver = NULL;
+
+ up(&cpufreq_driver_sem);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(cpufreq_unregister);
+
diff -ruN linux-2531orig/kernel/sysctl.c linux/kernel/sysctl.c
--- linux-2531orig/kernel/sysctl.c Wed Aug 28 10:01:11 2002
+++ linux/kernel/sysctl.c Wed Aug 28 10:13:03 2002
@@ -93,6 +93,24 @@
void *buffer, size_t *lenp);
#endif

+#ifdef CONFIG_CPU_FREQ
+extern int cpufreq_sysctl(ctl_table *table, int *name, int nlen,
+ void *oldval, size_t *oldlenp,
+ void *newval, size_t newlen, void **context);
+extern int
+cpufreq_procctl(ctl_table *ctl, int write, struct file *filp,
+ void *buffer, size_t *lenp);
+extern int
+cpufreq_procctl_max(ctl_table *ctl, int write, struct file *filp,
+ void *buffer, size_t *lenp);
+extern int
+cpufreq_procctl_min(ctl_table *ctl, int write, struct file *filp,
+ void *buffer, size_t *lenp);
+extern int
+cpufreq_procctl_sync(ctl_table *ctl, int write, struct file *filp,
+ void *buffer, size_t *lenp);
+#endif
+
#ifdef CONFIG_BSD_PROCESS_ACCT
extern int acct_parm[];
#endif
@@ -115,6 +133,7 @@
static ctl_table fs_table[];
static ctl_table debug_table[];
static ctl_table dev_table[];
+static ctl_table cpu_table[];
extern ctl_table random_table[];

/* /proc declarations: */
@@ -152,6 +171,7 @@
{CTL_FS, "fs", NULL, 0, 0555, fs_table},
{CTL_DEBUG, "debug", NULL, 0, 0555, debug_table},
{CTL_DEV, "dev", NULL, 0, 0555, dev_table},
+ {CTL_CPU, "cpu", NULL, 0, 0555, cpu_table},
{0}
};

@@ -345,6 +365,212 @@
static ctl_table dev_table[] = {
{0}
};
+
+
+/* ctl_table ctl_cpu_vars_{0,1,...,(NR_CPUS-1)} */
+/* due to NR_CPUS tweaking, a lot of if/endifs are required, sorry */
+ CTL_TABLE_CPU_VARS(0);
+#if NR_CPUS > 1
+ CTL_TABLE_CPU_VARS(1);
+#endif
+#if NR_CPUS > 2
+ CTL_TABLE_CPU_VARS(2);
+#endif
+#if NR_CPUS > 3
+ CTL_TABLE_CPU_VARS(3);
+#endif
+#if NR_CPUS > 4
+ CTL_TABLE_CPU_VARS(4);
+#endif
+#if NR_CPUS > 5
+ CTL_TABLE_CPU_VARS(5);
+#endif
+#if NR_CPUS > 6
+ CTL_TABLE_CPU_VARS(6);
+#endif
+#if NR_CPUS > 7
+ CTL_TABLE_CPU_VARS(7);
+#endif
+#if NR_CPUS > 8
+ CTL_TABLE_CPU_VARS(8);
+#endif
+#if NR_CPUS > 9
+ CTL_TABLE_CPU_VARS(9);
+#endif
+#if NR_CPUS > 10
+ CTL_TABLE_CPU_VARS(10);
+#endif
+#if NR_CPUS > 11
+ CTL_TABLE_CPU_VARS(11);
+#endif
+#if NR_CPUS > 12
+ CTL_TABLE_CPU_VARS(12);
+#endif
+#if NR_CPUS > 13
+ CTL_TABLE_CPU_VARS(13);
+#endif
+#if NR_CPUS > 14
+ CTL_TABLE_CPU_VARS(14);
+#endif
+#if NR_CPUS > 15
+ CTL_TABLE_CPU_VARS(15);
+#endif
+#if NR_CPUS > 16
+ CTL_TABLE_CPU_VARS(16);
+#endif
+#if NR_CPUS > 17
+ CTL_TABLE_CPU_VARS(17);
+#endif
+#if NR_CPUS > 18
+ CTL_TABLE_CPU_VARS(18);
+#endif
+#if NR_CPUS > 19
+ CTL_TABLE_CPU_VARS(19);
+#endif
+#if NR_CPUS > 20
+ CTL_TABLE_CPU_VARS(20);
+#endif
+#if NR_CPUS > 21
+ CTL_TABLE_CPU_VARS(21);
+#endif
+#if NR_CPUS > 22
+ CTL_TABLE_CPU_VARS(22);
+#endif
+#if NR_CPUS > 23
+ CTL_TABLE_CPU_VARS(23);
+#endif
+#if NR_CPUS > 24
+ CTL_TABLE_CPU_VARS(24);
+#endif
+#if NR_CPUS > 25
+ CTL_TABLE_CPU_VARS(25);
+#endif
+#if NR_CPUS > 26
+ CTL_TABLE_CPU_VARS(26);
+#endif
+#if NR_CPUS > 27
+ CTL_TABLE_CPU_VARS(27);
+#endif
+#if NR_CPUS > 28
+ CTL_TABLE_CPU_VARS(28);
+#endif
+#if NR_CPUS > 29
+ CTL_TABLE_CPU_VARS(29);
+#endif
+#if NR_CPUS > 30
+ CTL_TABLE_CPU_VARS(30);
+#endif
+#if NR_CPUS > 31
+ CTL_TABLE_CPU_VARS(31);
+#endif
+#if NR_CPUS > 32
+#error please extend CPU enumeration
+#endif
+
+/* due to NR_CPUS tweaking, a lot of if/endifs are required, sorry */
+static ctl_table cpu_table[NR_CPUS + 1] = {
+ CPU_ENUM(0),
+#if NR_CPUS > 1
+ CPU_ENUM(1),
+#endif
+#if NR_CPUS > 2
+ CPU_ENUM(2),
+#endif
+#if NR_CPUS > 3
+ CPU_ENUM(3),
+#endif
+#if NR_CPUS > 4
+ CPU_ENUM(4),
+#endif
+#if NR_CPUS > 5
+ CPU_ENUM(5),
+#endif
+#if NR_CPUS > 6
+ CPU_ENUM(6),
+#endif
+#if NR_CPUS > 7
+ CPU_ENUM(7),
+#endif
+#if NR_CPUS > 8
+ CPU_ENUM(8),
+#endif
+#if NR_CPUS > 9
+ CPU_ENUM(9),
+#endif
+#if NR_CPUS > 10
+ CPU_ENUM(10),
+#endif
+#if NR_CPUS > 11
+ CPU_ENUM(11),
+#endif
+#if NR_CPUS > 12
+ CPU_ENUM(12),
+#endif
+#if NR_CPUS > 13
+ CPU_ENUM(13),
+#endif
+#if NR_CPUS > 14
+ CPU_ENUM(14),
+#endif
+#if NR_CPUS > 15
+ CPU_ENUM(15),
+#endif
+#if NR_CPUS > 16
+ CPU_ENUM(16),
+#endif
+#if NR_CPUS > 17
+ CPU_ENUM(17),
+#endif
+#if NR_CPUS > 18
+ CPU_ENUM(18),
+#endif
+#if NR_CPUS > 19
+ CPU_ENUM(19),
+#endif
+#if NR_CPUS > 20
+ CPU_ENUM(20),
+#endif
+#if NR_CPUS > 21
+ CPU_ENUM(21),
+#endif
+#if NR_CPUS > 22
+ CPU_ENUM(22),
+#endif
+#if NR_CPUS > 23
+ CPU_ENUM(23),
+#endif
+#if NR_CPUS > 24
+ CPU_ENUM(24),
+#endif
+#if NR_CPUS > 25
+ CPU_ENUM(25),
+#endif
+#if NR_CPUS > 26
+ CPU_ENUM(26),
+#endif
+#if NR_CPUS > 27
+ CPU_ENUM(27),
+#endif
+#if NR_CPUS > 28
+ CPU_ENUM(28),
+#endif
+#if NR_CPUS > 29
+ CPU_ENUM(29),
+#endif
+#if NR_CPUS > 30
+ CPU_ENUM(30),
+#endif
+#if NR_CPUS > 31
+ CPU_ENUM(31),
+#endif
+#if NR_CPUS > 32
+#error please extend CPU enumeration
+#endif
+ {
+ ctl_name: 0,
+ }
+};
+

extern void init_irq_proc (void);
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