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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/cpufreq
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'drivers/cpufreq')
-rw-r--r--drivers/cpufreq/Kconfig118
-rw-r--r--drivers/cpufreq/Makefile14
-rw-r--r--drivers/cpufreq/cpufreq.c1428
-rw-r--r--drivers/cpufreq/cpufreq_ondemand.c491
-rw-r--r--drivers/cpufreq/cpufreq_performance.c61
-rw-r--r--drivers/cpufreq/cpufreq_powersave.c59
-rw-r--r--drivers/cpufreq/cpufreq_stats.c334
-rw-r--r--drivers/cpufreq/cpufreq_userspace.c207
-rw-r--r--drivers/cpufreq/freq_table.c225
9 files changed, 2937 insertions, 0 deletions
diff --git a/drivers/cpufreq/Kconfig b/drivers/cpufreq/Kconfig
new file mode 100644
index 000000000000..95882bb1950e
--- /dev/null
+++ b/drivers/cpufreq/Kconfig
@@ -0,0 +1,118 @@
+config CPU_FREQ
+ bool "CPU Frequency scaling"
+ help
+ CPU Frequency scaling allows you to change the clock speed of
+ CPUs on the fly. This is a nice method to save power, because
+ the lower the CPU clock speed, the less power the CPU consumes.
+
+ Note that this driver doesn't automatically change the CPU
+ clock speed, you need to either enable a dynamic cpufreq governor
+ (see below) after boot, or use a userspace tool.
+
+ For details, take a look at <file:Documentation/cpu-freq>.
+
+ If in doubt, say N.
+
+if CPU_FREQ
+
+config CPU_FREQ_TABLE
+ def_tristate m
+
+config CPU_FREQ_DEBUG
+ bool "Enable CPUfreq debugging"
+ help
+ Say Y here to enable CPUfreq subsystem (including drivers)
+ debugging. You will need to activate it via the kernel
+ command line by passing
+ cpufreq.debug=<value>
+
+ To get <value>, add
+ 1 to activate CPUfreq core debugging,
+ 2 to activate CPUfreq drivers debugging, and
+ 4 to activate CPUfreq governor debugging
+
+config CPU_FREQ_STAT
+ tristate "CPU frequency translation statistics"
+ select CPU_FREQ_TABLE
+ default y
+ help
+ This driver exports CPU frequency statistics information through sysfs
+ file system
+
+config CPU_FREQ_STAT_DETAILS
+ bool "CPU frequency translation statistics details"
+ depends on CPU_FREQ_STAT
+ help
+ This will show detail CPU frequency translation table in sysfs file
+ system
+
+choice
+ prompt "Default CPUFreq governor"
+ default CPU_FREQ_DEFAULT_GOV_USERSPACE if CPU_FREQ_SA1100 || CPU_FREQ_SA1110
+ default CPU_FREQ_DEFAULT_GOV_PERFORMANCE
+ help
+ This option sets which CPUFreq governor shall be loaded at
+ startup. If in doubt, select 'performance'.
+
+config CPU_FREQ_DEFAULT_GOV_PERFORMANCE
+ bool "performance"
+ select CPU_FREQ_GOV_PERFORMANCE
+ help
+ Use the CPUFreq governor 'performance' as default. This sets
+ the frequency statically to the highest frequency supported by
+ the CPU.
+
+config CPU_FREQ_DEFAULT_GOV_USERSPACE
+ bool "userspace"
+ select CPU_FREQ_GOV_USERSPACE
+ help
+ Use the CPUFreq governor 'userspace' as default. This allows
+ you to set the CPU frequency manually or when an userspace
+ program shall be able to set the CPU dynamically without having
+ to enable the userspace governor manually.
+
+endchoice
+
+config CPU_FREQ_GOV_PERFORMANCE
+ tristate "'performance' governor"
+ help
+ This cpufreq governor sets the frequency statically to the
+ highest available CPU frequency.
+
+ If in doubt, say Y.
+
+config CPU_FREQ_GOV_POWERSAVE
+ tristate "'powersave' governor"
+ help
+ This cpufreq governor sets the frequency statically to the
+ lowest available CPU frequency.
+
+ If in doubt, say Y.
+
+config CPU_FREQ_GOV_USERSPACE
+ tristate "'userspace' governor for userspace frequency scaling"
+ help
+ Enable this cpufreq governor when you either want to set the
+ CPU frequency manually or when an userspace program shall
+ be able to set the CPU dynamically, like on LART
+ <http://www.lart.tudelft.nl/>
+
+ For details, take a look at <file:Documentation/cpu-freq/>.
+
+ If in doubt, say Y.
+
+config CPU_FREQ_GOV_ONDEMAND
+ tristate "'ondemand' cpufreq policy governor"
+ help
+ 'ondemand' - This driver adds a dynamic cpufreq policy governor.
+ The governor does a periodic polling and
+ changes frequency based on the CPU utilization.
+ The support for this governor depends on CPU capability to
+ do fast frequency switching (i.e, very low latency frequency
+ transitions).
+
+ For details, take a look at linux/Documentation/cpu-freq.
+
+ If in doubt, say N.
+
+endif # CPU_FREQ
diff --git a/drivers/cpufreq/Makefile b/drivers/cpufreq/Makefile
new file mode 100644
index 000000000000..67b16e5a41a7
--- /dev/null
+++ b/drivers/cpufreq/Makefile
@@ -0,0 +1,14 @@
+# CPUfreq core
+obj-$(CONFIG_CPU_FREQ) += cpufreq.o
+# CPUfreq stats
+obj-$(CONFIG_CPU_FREQ_STAT) += cpufreq_stats.o
+
+# CPUfreq governors
+obj-$(CONFIG_CPU_FREQ_GOV_PERFORMANCE) += cpufreq_performance.o
+obj-$(CONFIG_CPU_FREQ_GOV_POWERSAVE) += cpufreq_powersave.o
+obj-$(CONFIG_CPU_FREQ_GOV_USERSPACE) += cpufreq_userspace.o
+obj-$(CONFIG_CPU_FREQ_GOV_ONDEMAND) += cpufreq_ondemand.o
+
+# CPUfreq cross-arch helpers
+obj-$(CONFIG_CPU_FREQ_TABLE) += freq_table.o
+
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
new file mode 100644
index 000000000000..b30001f31610
--- /dev/null
+++ b/drivers/cpufreq/cpufreq.c
@@ -0,0 +1,1428 @@
+/*
+ * linux/drivers/cpufreq/cpufreq.c
+ *
+ * Copyright (C) 2001 Russell King
+ * (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de>
+ *
+ * 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 <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/notifier.h>
+#include <linux/cpufreq.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/spinlock.h>
+#include <linux/device.h>
+#include <linux/slab.h>
+#include <linux/cpu.h>
+#include <linux/completion.h>
+
+#define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_CORE, "cpufreq-core", msg)
+
+/**
+ * The "cpufreq driver" - the arch- or hardware-dependend low
+ * level driver of CPUFreq support, and its spinlock. This lock
+ * also protects the cpufreq_cpu_data array.
+ */
+static struct cpufreq_driver *cpufreq_driver;
+static struct cpufreq_policy *cpufreq_cpu_data[NR_CPUS];
+static DEFINE_SPINLOCK(cpufreq_driver_lock);
+
+
+/* we keep a copy of all ->add'ed CPU's struct sys_device here;
+ * as it is only accessed in ->add and ->remove, no lock or reference
+ * count is necessary.
+ */
+static struct sys_device *cpu_sys_devices[NR_CPUS];
+
+
+/* internal prototypes */
+static int __cpufreq_governor(struct cpufreq_policy *policy, unsigned int event);
+static void handle_update(void *data);
+static inline void adjust_jiffies(unsigned long val, struct cpufreq_freqs *ci);
+
+/**
+ * Two notifier lists: the "policy" list is involved in the
+ * validation process for a new CPU frequency policy; the
+ * "transition" list for kernel code that needs to handle
+ * changes to devices when the CPU clock speed changes.
+ * The mutex locks both lists.
+ */
+static struct notifier_block *cpufreq_policy_notifier_list;
+static struct notifier_block *cpufreq_transition_notifier_list;
+static DECLARE_RWSEM (cpufreq_notifier_rwsem);
+
+
+static LIST_HEAD(cpufreq_governor_list);
+static DECLARE_MUTEX (cpufreq_governor_sem);
+
+struct cpufreq_policy * cpufreq_cpu_get(unsigned int cpu)
+{
+ struct cpufreq_policy *data;
+ unsigned long flags;
+
+ if (cpu >= NR_CPUS)
+ goto err_out;
+
+ /* get the cpufreq driver */
+ spin_lock_irqsave(&cpufreq_driver_lock, flags);
+
+ if (!cpufreq_driver)
+ goto err_out_unlock;
+
+ if (!try_module_get(cpufreq_driver->owner))
+ goto err_out_unlock;
+
+
+ /* get the CPU */
+ data = cpufreq_cpu_data[cpu];
+
+ if (!data)
+ goto err_out_put_module;
+
+ if (!kobject_get(&data->kobj))
+ goto err_out_put_module;
+
+
+ spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
+
+ return data;
+
+ err_out_put_module:
+ module_put(cpufreq_driver->owner);
+ err_out_unlock:
+ spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
+ err_out:
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(cpufreq_cpu_get);
+
+void cpufreq_cpu_put(struct cpufreq_policy *data)
+{
+ kobject_put(&data->kobj);
+ module_put(cpufreq_driver->owner);
+}
+EXPORT_SYMBOL_GPL(cpufreq_cpu_put);
+
+
+/*********************************************************************
+ * UNIFIED DEBUG HELPERS *
+ *********************************************************************/
+#ifdef CONFIG_CPU_FREQ_DEBUG
+
+/* what part(s) of the CPUfreq subsystem are debugged? */
+static unsigned int debug;
+
+/* is the debug output ratelimit'ed using printk_ratelimit? User can
+ * set or modify this value.
+ */
+static unsigned int debug_ratelimit = 1;
+
+/* is the printk_ratelimit'ing enabled? It's enabled after a successful
+ * loading of a cpufreq driver, temporarily disabled when a new policy
+ * is set, and disabled upon cpufreq driver removal
+ */
+static unsigned int disable_ratelimit = 1;
+static DEFINE_SPINLOCK(disable_ratelimit_lock);
+
+static inline void cpufreq_debug_enable_ratelimit(void)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&disable_ratelimit_lock, flags);
+ if (disable_ratelimit)
+ disable_ratelimit--;
+ spin_unlock_irqrestore(&disable_ratelimit_lock, flags);
+}
+
+static inline void cpufreq_debug_disable_ratelimit(void)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&disable_ratelimit_lock, flags);
+ disable_ratelimit++;
+ spin_unlock_irqrestore(&disable_ratelimit_lock, flags);
+}
+
+void cpufreq_debug_printk(unsigned int type, const char *prefix, const char *fmt, ...)
+{
+ char s[256];
+ va_list args;
+ unsigned int len;
+ unsigned long flags;
+
+ WARN_ON(!prefix);
+ if (type & debug) {
+ spin_lock_irqsave(&disable_ratelimit_lock, flags);
+ if (!disable_ratelimit && debug_ratelimit && !printk_ratelimit()) {
+ spin_unlock_irqrestore(&disable_ratelimit_lock, flags);
+ return;
+ }
+ spin_unlock_irqrestore(&disable_ratelimit_lock, flags);
+
+ len = snprintf(s, 256, KERN_DEBUG "%s: ", prefix);
+
+ va_start(args, fmt);
+ len += vsnprintf(&s[len], (256 - len), fmt, args);
+ va_end(args);
+
+ printk(s);
+
+ WARN_ON(len < 5);
+ }
+}
+EXPORT_SYMBOL(cpufreq_debug_printk);
+
+
+module_param(debug, uint, 0644);
+MODULE_PARM_DESC(debug, "CPUfreq debugging: add 1 to debug core, 2 to debug drivers, and 4 to debug governors.");
+
+module_param(debug_ratelimit, uint, 0644);
+MODULE_PARM_DESC(debug_ratelimit, "CPUfreq debugging: set to 0 to disable ratelimiting.");
+
+#else /* !CONFIG_CPU_FREQ_DEBUG */
+
+static inline void cpufreq_debug_enable_ratelimit(void) { return; }
+static inline void cpufreq_debug_disable_ratelimit(void) { return; }
+
+#endif /* CONFIG_CPU_FREQ_DEBUG */
+
+
+/*********************************************************************
+ * EXTERNALLY AFFECTING FREQUENCY CHANGES *
+ *********************************************************************/
+
+/**
+ * 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 cannot be updated on SMP
+ * systems as each CPU might be scaled differently. So, use the arch
+ * per-CPU loops_per_jiffy value wherever possible.
+ */
+#ifndef CONFIG_SMP
+static unsigned long l_p_j_ref;
+static unsigned int l_p_j_ref_freq;
+
+static inline void adjust_jiffies(unsigned long val, struct cpufreq_freqs *ci)
+{
+ if (ci->flags & CPUFREQ_CONST_LOOPS)
+ return;
+
+ if (!l_p_j_ref_freq) {
+ l_p_j_ref = loops_per_jiffy;
+ l_p_j_ref_freq = ci->old;
+ dprintk("saving %lu as reference value for loops_per_jiffy; freq is %u kHz\n", l_p_j_ref, l_p_j_ref_freq);
+ }
+ if ((val == CPUFREQ_PRECHANGE && ci->old < ci->new) ||
+ (val == CPUFREQ_POSTCHANGE && ci->old > ci->new) ||
+ (val == CPUFREQ_RESUMECHANGE)) {
+ loops_per_jiffy = cpufreq_scale(l_p_j_ref, l_p_j_ref_freq, ci->new);
+ dprintk("scaling loops_per_jiffy to %lu for frequency %u kHz\n", loops_per_jiffy, ci->new);
+ }
+}
+#else
+static inline void adjust_jiffies(unsigned long val, struct cpufreq_freqs *ci) { return; }
+#endif
+
+
+/**
+ * cpufreq_notify_transition - call notifier chain and adjust_jiffies on frequency transition
+ *
+ * This function calls the transition notifiers and the "adjust_jiffies" function. It is called
+ * twice on all CPU frequency changes that have external effects.
+ */
+void cpufreq_notify_transition(struct cpufreq_freqs *freqs, unsigned int state)
+{
+ BUG_ON(irqs_disabled());
+
+ freqs->flags = cpufreq_driver->flags;
+ dprintk("notification %u of frequency transition to %u kHz\n", state, freqs->new);
+
+ down_read(&cpufreq_notifier_rwsem);
+ switch (state) {
+ case CPUFREQ_PRECHANGE:
+ /* detect if the driver reported a value as "old frequency" which
+ * is not equal to what the cpufreq core thinks is "old frequency".
+ */
+ if (!(cpufreq_driver->flags & CPUFREQ_CONST_LOOPS)) {
+ if ((likely(cpufreq_cpu_data[freqs->cpu])) &&
+ (likely(cpufreq_cpu_data[freqs->cpu]->cpu == freqs->cpu)) &&
+ (likely(cpufreq_cpu_data[freqs->cpu]->cur)) &&
+ (unlikely(freqs->old != cpufreq_cpu_data[freqs->cpu]->cur)))
+ {
+ printk(KERN_WARNING "Warning: CPU frequency is %u, "
+ "cpufreq assumed %u kHz.\n", freqs->old, cpufreq_cpu_data[freqs->cpu]->cur);
+ freqs->old = cpufreq_cpu_data[freqs->cpu]->cur;
+ }
+ }
+ notifier_call_chain(&cpufreq_transition_notifier_list, CPUFREQ_PRECHANGE, freqs);
+ adjust_jiffies(CPUFREQ_PRECHANGE, freqs);
+ break;
+ case CPUFREQ_POSTCHANGE:
+ adjust_jiffies(CPUFREQ_POSTCHANGE, freqs);
+ notifier_call_chain(&cpufreq_transition_notifier_list, CPUFREQ_POSTCHANGE, freqs);
+ if ((likely(cpufreq_cpu_data[freqs->cpu])) &&
+ (likely(cpufreq_cpu_data[freqs->cpu]->cpu == freqs->cpu)))
+ cpufreq_cpu_data[freqs->cpu]->cur = freqs->new;
+ break;
+ }
+ up_read(&cpufreq_notifier_rwsem);
+}
+EXPORT_SYMBOL_GPL(cpufreq_notify_transition);
+
+
+
+/*********************************************************************
+ * SYSFS INTERFACE *
+ *********************************************************************/
+
+/**
+ * cpufreq_parse_governor - parse a governor string
+ */
+static int cpufreq_parse_governor (char *str_governor, unsigned int *policy,
+ struct cpufreq_governor **governor)
+{
+ if (!cpufreq_driver)
+ return -EINVAL;
+ if (cpufreq_driver->setpolicy) {
+ if (!strnicmp(str_governor, "performance", CPUFREQ_NAME_LEN)) {
+ *policy = CPUFREQ_POLICY_PERFORMANCE;
+ return 0;
+ } else if (!strnicmp(str_governor, "powersave", CPUFREQ_NAME_LEN)) {
+ *policy = CPUFREQ_POLICY_POWERSAVE;
+ return 0;
+ }
+ return -EINVAL;
+ } else {
+ struct cpufreq_governor *t;
+ down(&cpufreq_governor_sem);
+ if (!cpufreq_driver || !cpufreq_driver->target)
+ goto out;
+ list_for_each_entry(t, &cpufreq_governor_list, governor_list) {
+ if (!strnicmp(str_governor,t->name,CPUFREQ_NAME_LEN)) {
+ *governor = t;
+ up(&cpufreq_governor_sem);
+ return 0;
+ }
+ }
+ out:
+ up(&cpufreq_governor_sem);
+ }
+ return -EINVAL;
+}
+EXPORT_SYMBOL_GPL(cpufreq_parse_governor);
+
+
+/* drivers/base/cpu.c */
+extern struct sysdev_class cpu_sysdev_class;
+
+
+/**
+ * cpufreq_per_cpu_attr_read() / show_##file_name() - print out cpufreq information
+ *
+ * Write out information from cpufreq_driver->policy[cpu]; object must be
+ * "unsigned int".
+ */
+
+#define show_one(file_name, object) \
+static ssize_t show_##file_name \
+(struct cpufreq_policy * policy, char *buf) \
+{ \
+ return sprintf (buf, "%u\n", policy->object); \
+}
+
+show_one(cpuinfo_min_freq, cpuinfo.min_freq);
+show_one(cpuinfo_max_freq, cpuinfo.max_freq);
+show_one(scaling_min_freq, min);
+show_one(scaling_max_freq, max);
+show_one(scaling_cur_freq, cur);
+
+/**
+ * cpufreq_per_cpu_attr_write() / store_##file_name() - sysfs write access
+ */
+#define store_one(file_name, object) \
+static ssize_t store_##file_name \
+(struct cpufreq_policy * policy, const char *buf, size_t count) \
+{ \
+ unsigned int ret = -EINVAL; \
+ struct cpufreq_policy new_policy; \
+ \
+ ret = cpufreq_get_policy(&new_policy, policy->cpu); \
+ if (ret) \
+ return -EINVAL; \
+ \
+ ret = sscanf (buf, "%u", &new_policy.object); \
+ if (ret != 1) \
+ return -EINVAL; \
+ \
+ ret = cpufreq_set_policy(&new_policy); \
+ \
+ return ret ? ret : count; \
+}
+
+store_one(scaling_min_freq,min);
+store_one(scaling_max_freq,max);
+
+/**
+ * show_cpuinfo_cur_freq - current CPU frequency as detected by hardware
+ */
+static ssize_t show_cpuinfo_cur_freq (struct cpufreq_policy * policy, char *buf)
+{
+ unsigned int cur_freq = cpufreq_get(policy->cpu);
+ if (!cur_freq)
+ return sprintf(buf, "<unknown>");
+ return sprintf(buf, "%u\n", cur_freq);
+}
+
+
+/**
+ * show_scaling_governor - show the current policy for the specified CPU
+ */
+static ssize_t show_scaling_governor (struct cpufreq_policy * policy, char *buf)
+{
+ if(policy->policy == CPUFREQ_POLICY_POWERSAVE)
+ return sprintf(buf, "powersave\n");
+ else if (policy->policy == CPUFREQ_POLICY_PERFORMANCE)
+ return sprintf(buf, "performance\n");
+ else if (policy->governor)
+ return scnprintf(buf, CPUFREQ_NAME_LEN, "%s\n", policy->governor->name);
+ return -EINVAL;
+}
+
+
+/**
+ * store_scaling_governor - store policy for the specified CPU
+ */
+static ssize_t store_scaling_governor (struct cpufreq_policy * policy,
+ const char *buf, size_t count)
+{
+ unsigned int ret = -EINVAL;
+ char str_governor[16];
+ struct cpufreq_policy new_policy;
+
+ ret = cpufreq_get_policy(&new_policy, policy->cpu);
+ if (ret)
+ return ret;
+
+ ret = sscanf (buf, "%15s", str_governor);
+ if (ret != 1)
+ return -EINVAL;
+
+ if (cpufreq_parse_governor(str_governor, &new_policy.policy, &new_policy.governor))
+ return -EINVAL;
+
+ ret = cpufreq_set_policy(&new_policy);
+
+ return ret ? ret : count;
+}
+
+/**
+ * show_scaling_driver - show the cpufreq driver currently loaded
+ */
+static ssize_t show_scaling_driver (struct cpufreq_policy * policy, char *buf)
+{
+ return scnprintf(buf, CPUFREQ_NAME_LEN, "%s\n", cpufreq_driver->name);
+}
+
+/**
+ * show_scaling_available_governors - show the available CPUfreq governors
+ */
+static ssize_t show_scaling_available_governors (struct cpufreq_policy * policy,
+ char *buf)
+{
+ ssize_t i = 0;
+ struct cpufreq_governor *t;
+
+ if (!cpufreq_driver->target) {
+ i += sprintf(buf, "performance powersave");
+ goto out;
+ }
+
+ list_for_each_entry(t, &cpufreq_governor_list, governor_list) {
+ if (i >= (ssize_t) ((PAGE_SIZE / sizeof(char)) - (CPUFREQ_NAME_LEN + 2)))
+ goto out;
+ i += scnprintf(&buf[i], CPUFREQ_NAME_LEN, "%s ", t->name);
+ }
+ out:
+ i += sprintf(&buf[i], "\n");
+ return i;
+}
+/**
+ * show_affected_cpus - show the CPUs affected by each transition
+ */
+static ssize_t show_affected_cpus (struct cpufreq_policy * policy, char *buf)
+{
+ ssize_t i = 0;
+ unsigned int cpu;
+
+ for_each_cpu_mask(cpu, policy->cpus) {
+ if (i)
+ i += scnprintf(&buf[i], (PAGE_SIZE - i - 2), " ");
+ i += scnprintf(&buf[i], (PAGE_SIZE - i - 2), "%u", cpu);
+ if (i >= (PAGE_SIZE - 5))
+ break;
+ }
+ i += sprintf(&buf[i], "\n");
+ return i;
+}
+
+
+#define define_one_ro(_name) \
+static struct freq_attr _name = \
+__ATTR(_name, 0444, show_##_name, NULL)
+
+#define define_one_ro0400(_name) \
+static struct freq_attr _name = \
+__ATTR(_name, 0400, show_##_name, NULL)
+
+#define define_one_rw(_name) \
+static struct freq_attr _name = \
+__ATTR(_name, 0644, show_##_name, store_##_name)
+
+define_one_ro0400(cpuinfo_cur_freq);
+define_one_ro(cpuinfo_min_freq);
+define_one_ro(cpuinfo_max_freq);
+define_one_ro(scaling_available_governors);
+define_one_ro(scaling_driver);
+define_one_ro(scaling_cur_freq);
+define_one_ro(affected_cpus);
+define_one_rw(scaling_min_freq);
+define_one_rw(scaling_max_freq);
+define_one_rw(scaling_governor);
+
+static struct attribute * default_attrs[] = {
+ &cpuinfo_min_freq.attr,
+ &cpuinfo_max_freq.attr,
+ &scaling_min_freq.attr,
+ &scaling_max_freq.attr,
+ &affected_cpus.attr,
+ &scaling_governor.attr,
+ &scaling_driver.attr,
+ &scaling_available_governors.attr,
+ NULL
+};
+
+#define to_policy(k) container_of(k,struct cpufreq_policy,kobj)
+#define to_attr(a) container_of(a,struct freq_attr,attr)
+
+static ssize_t show(struct kobject * kobj, struct attribute * attr ,char * buf)
+{
+ struct cpufreq_policy * policy = to_policy(kobj);
+ struct freq_attr * fattr = to_attr(attr);
+ ssize_t ret;
+ policy = cpufreq_cpu_get(policy->cpu);
+ if (!policy)
+ return -EINVAL;
+ ret = fattr->show ? fattr->show(policy,buf) : 0;
+ cpufreq_cpu_put(policy);
+ return ret;
+}
+
+static ssize_t store(struct kobject * kobj, struct attribute * attr,
+ const char * buf, size_t count)
+{
+ struct cpufreq_policy * policy = to_policy(kobj);
+ struct freq_attr * fattr = to_attr(attr);
+ ssize_t ret;
+ policy = cpufreq_cpu_get(policy->cpu);
+ if (!policy)
+ return -EINVAL;
+ ret = fattr->store ? fattr->store(policy,buf,count) : 0;
+ cpufreq_cpu_put(policy);
+ return ret;
+}
+
+static void cpufreq_sysfs_release(struct kobject * kobj)
+{
+ struct cpufreq_policy * policy = to_policy(kobj);
+ dprintk("last reference is dropped\n");
+ complete(&policy->kobj_unregister);
+}
+
+static struct sysfs_ops sysfs_ops = {
+ .show = show,
+ .store = store,
+};
+
+static struct kobj_type ktype_cpufreq = {
+ .sysfs_ops = &sysfs_ops,
+ .default_attrs = default_attrs,
+ .release = cpufreq_sysfs_release,
+};
+
+
+/**
+ * cpufreq_add_dev - add a CPU device
+ *
+ * Adds the cpufreq interface for a CPU device.
+ */
+static int cpufreq_add_dev (struct sys_device * sys_dev)
+{
+ unsigned int cpu = sys_dev->id;
+ int ret = 0;
+ struct cpufreq_policy new_policy;
+ struct cpufreq_policy *policy;
+ struct freq_attr **drv_attr;
+ unsigned long flags;
+ unsigned int j;
+
+ cpufreq_debug_disable_ratelimit();
+ dprintk("adding CPU %u\n", cpu);
+
+#ifdef CONFIG_SMP
+ /* check whether a different CPU already registered this
+ * CPU because it is in the same boat. */
+ policy = cpufreq_cpu_get(cpu);
+ if (unlikely(policy)) {
+ cpu_sys_devices[cpu] = sys_dev;
+ dprintk("CPU already managed, adding link\n");
+ sysfs_create_link(&sys_dev->kobj, &policy->kobj, "cpufreq");
+ cpufreq_debug_enable_ratelimit();
+ return 0;
+ }
+#endif
+
+ if (!try_module_get(cpufreq_driver->owner)) {
+ ret = -EINVAL;
+ goto module_out;
+ }
+
+ policy = kmalloc(sizeof(struct cpufreq_policy), GFP_KERNEL);
+ if (!policy) {
+ ret = -ENOMEM;
+ goto nomem_out;
+ }
+ memset(policy, 0, sizeof(struct cpufreq_policy));
+
+ policy->cpu = cpu;
+ policy->cpus = cpumask_of_cpu(cpu);
+
+ init_MUTEX_LOCKED(&policy->lock);
+ init_completion(&policy->kobj_unregister);
+ INIT_WORK(&policy->update, handle_update, (void *)(long)cpu);
+
+ /* call driver. From then on the cpufreq must be able
+ * to accept all calls to ->verify and ->setpolicy for this CPU
+ */
+ ret = cpufreq_driver->init(policy);
+ if (ret) {
+ dprintk("initialization failed\n");
+ goto err_out;
+ }
+
+ memcpy(&new_policy, policy, sizeof(struct cpufreq_policy));
+
+ /* prepare interface data */
+ policy->kobj.parent = &sys_dev->kobj;
+ policy->kobj.ktype = &ktype_cpufreq;
+ strlcpy(policy->kobj.name, "cpufreq", KOBJ_NAME_LEN);
+
+ ret = kobject_register(&policy->kobj);
+ if (ret)
+ goto err_out;
+
+ /* set up files for this cpu device */
+ drv_attr = cpufreq_driver->attr;
+ while ((drv_attr) && (*drv_attr)) {
+ sysfs_create_file(&policy->kobj, &((*drv_attr)->attr));
+ drv_attr++;
+ }
+ if (cpufreq_driver->get)
+ sysfs_create_file(&policy->kobj, &cpuinfo_cur_freq.attr);
+ if (cpufreq_driver->target)
+ sysfs_create_file(&policy->kobj, &scaling_cur_freq.attr);
+
+ spin_lock_irqsave(&cpufreq_driver_lock, flags);
+ for_each_cpu_mask(j, policy->cpus)
+ cpufreq_cpu_data[j] = policy;
+ spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
+ policy->governor = NULL; /* to assure that the starting sequence is
+ * run in cpufreq_set_policy */
+ up(&policy->lock);
+
+ /* set default policy */
+
+ ret = cpufreq_set_policy(&new_policy);
+ if (ret) {
+ dprintk("setting policy failed\n");
+ goto err_out_unregister;
+ }
+
+ module_put(cpufreq_driver->owner);
+ cpu_sys_devices[cpu] = sys_dev;
+ dprintk("initialization complete\n");
+ cpufreq_debug_enable_ratelimit();
+
+ return 0;
+
+
+err_out_unregister:
+ spin_lock_irqsave(&cpufreq_driver_lock, flags);
+ for_each_cpu_mask(j, policy->cpus)
+ cpufreq_cpu_data[j] = NULL;
+ spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
+
+ kobject_unregister(&policy->kobj);
+ wait_for_completion(&policy->kobj_unregister);
+
+err_out:
+ kfree(policy);
+
+nomem_out:
+ module_put(cpufreq_driver->owner);
+ module_out:
+ cpufreq_debug_enable_ratelimit();
+ return ret;
+}
+
+
+/**
+ * cpufreq_remove_dev - remove a CPU device
+ *
+ * Removes the cpufreq interface for a CPU device.
+ */
+static int cpufreq_remove_dev (struct sys_device * sys_dev)
+{
+ unsigned int cpu = sys_dev->id;
+ unsigned long flags;
+ struct cpufreq_policy *data;
+#ifdef CONFIG_SMP
+ unsigned int j;
+#endif
+
+ cpufreq_debug_disable_ratelimit();
+ dprintk("unregistering CPU %u\n", cpu);
+
+ spin_lock_irqsave(&cpufreq_driver_lock, flags);
+ data = cpufreq_cpu_data[cpu];
+
+ if (!data) {
+ spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
+ cpu_sys_devices[cpu] = NULL;
+ cpufreq_debug_enable_ratelimit();
+ return -EINVAL;
+ }
+ cpufreq_cpu_data[cpu] = NULL;
+
+
+#ifdef CONFIG_SMP
+ /* if this isn't the CPU which is the parent of the kobj, we
+ * only need to unlink, put and exit
+ */
+ if (unlikely(cpu != data->cpu)) {
+ dprintk("removing link\n");
+ spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
+ sysfs_remove_link(&sys_dev->kobj, "cpufreq");
+ cpu_sys_devices[cpu] = NULL;
+ cpufreq_cpu_put(data);
+ cpufreq_debug_enable_ratelimit();
+ return 0;
+ }
+#endif
+
+ cpu_sys_devices[cpu] = NULL;
+
+ if (!kobject_get(&data->kobj)) {
+ spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
+ cpufreq_debug_enable_ratelimit();
+ return -EFAULT;
+ }
+
+#ifdef CONFIG_SMP
+ /* if we have other CPUs still registered, we need to unlink them,
+ * or else wait_for_completion below will lock up. Clean the
+ * cpufreq_cpu_data[] while holding the lock, and remove the sysfs
+ * links afterwards.
+ */
+ if (unlikely(cpus_weight(data->cpus) > 1)) {
+ for_each_cpu_mask(j, data->cpus) {
+ if (j == cpu)
+ continue;
+ cpufreq_cpu_data[j] = NULL;
+ }
+ }
+
+ spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
+
+ if (unlikely(cpus_weight(data->cpus) > 1)) {
+ for_each_cpu_mask(j, data->cpus) {
+ if (j == cpu)
+ continue;
+ dprintk("removing link for cpu %u\n", j);
+ sysfs_remove_link(&cpu_sys_devices[j]->kobj, "cpufreq");
+ cpufreq_cpu_put(data);
+ }
+ }
+#else
+ spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
+#endif
+
+ down(&data->lock);
+ if (cpufreq_driver->target)
+ __cpufreq_governor(data, CPUFREQ_GOV_STOP);
+ cpufreq_driver->target = NULL;
+ up(&data->lock);
+
+ kobject_unregister(&data->kobj);
+
+ kobject_put(&data->kobj);
+
+ /* we need to make sure that the underlying kobj is actually
+ * not referenced anymore by anybody before we proceed with
+ * unloading.
+ */
+ dprintk("waiting for dropping of refcount\n");
+ wait_for_completion(&data->kobj_unregister);
+ dprintk("wait complete\n");
+
+ if (cpufreq_driver->exit)
+ cpufreq_driver->exit(data);
+
+ kfree(data);
+
+ cpufreq_debug_enable_ratelimit();
+
+ return 0;
+}
+
+
+static void handle_update(void *data)
+{
+ unsigned int cpu = (unsigned int)(long)data;
+ dprintk("handle_update for cpu %u called\n", cpu);
+ cpufreq_update_policy(cpu);
+}
+
+/**
+ * cpufreq_out_of_sync - If actual and saved CPU frequency differs, we're in deep trouble.
+ * @cpu: cpu number
+ * @old_freq: CPU frequency the kernel thinks the CPU runs at
+ * @new_freq: CPU frequency the CPU actually runs at
+ *
+ * We adjust to current frequency first, and need to clean up later. So either call
+ * to cpufreq_update_policy() or schedule handle_update()).
+ */
+static void cpufreq_out_of_sync(unsigned int cpu, unsigned int old_freq, unsigned int new_freq)
+{
+ struct cpufreq_freqs freqs;
+
+ printk(KERN_WARNING "Warning: CPU frequency out of sync: cpufreq and timing "
+ "core thinks of %u, is %u kHz.\n", old_freq, new_freq);
+
+ freqs.cpu = cpu;
+ freqs.old = old_freq;
+ freqs.new = new_freq;
+ cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
+ cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
+}
+
+
+/**
+ * cpufreq_get - get the current CPU frequency (in kHz)
+ * @cpu: CPU number
+ *
+ * Get the CPU current (static) CPU frequency
+ */
+unsigned int cpufreq_get(unsigned int cpu)
+{
+ struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
+ unsigned int ret = 0;
+
+ if (!policy)
+ return 0;
+
+ if (!cpufreq_driver->get)
+ goto out;
+
+ down(&policy->lock);
+
+ ret = cpufreq_driver->get(cpu);
+
+ if (ret && policy->cur && !(cpufreq_driver->flags & CPUFREQ_CONST_LOOPS))
+ {
+ /* verify no discrepancy between actual and saved value exists */
+ if (unlikely(ret != policy->cur)) {
+ cpufreq_out_of_sync(cpu, policy->cur, ret);
+ schedule_work(&policy->update);
+ }
+ }
+
+ up(&policy->lock);
+
+ out:
+ cpufreq_cpu_put(policy);
+
+ return (ret);
+}
+EXPORT_SYMBOL(cpufreq_get);
+
+
+/**
+ * cpufreq_resume - restore proper CPU frequency handling after resume
+ *
+ * 1.) resume CPUfreq hardware support (cpufreq_driver->resume())
+ * 2.) if ->target and !CPUFREQ_CONST_LOOPS: verify we're in sync
+ * 3.) schedule call cpufreq_update_policy() ASAP as interrupts are restored.
+ */
+static int cpufreq_resume(struct sys_device * sysdev)
+{
+ int cpu = sysdev->id;
+ unsigned int ret = 0;
+ struct cpufreq_policy *cpu_policy;
+
+ dprintk("resuming cpu %u\n", cpu);
+
+ if (!cpu_online(cpu))
+ return 0;
+
+ /* we may be lax here as interrupts are off. Nonetheless
+ * we need to grab the correct cpu policy, as to check
+ * whether we really run on this CPU.
+ */
+
+ cpu_policy = cpufreq_cpu_get(cpu);
+ if (!cpu_policy)
+ return -EINVAL;
+
+ /* only handle each CPU group once */
+ if (unlikely(cpu_policy->cpu != cpu)) {
+ cpufreq_cpu_put(cpu_policy);
+ return 0;
+ }
+
+ if (cpufreq_driver->resume) {
+ ret = cpufreq_driver->resume(cpu_policy);
+ if (ret) {
+ printk(KERN_ERR "cpufreq: resume failed in ->resume "
+ "step on CPU %u\n", cpu_policy->cpu);
+ cpufreq_cpu_put(cpu_policy);
+ return ret;
+ }
+ }
+
+ if (!(cpufreq_driver->flags & CPUFREQ_CONST_LOOPS)) {
+ unsigned int cur_freq = 0;
+
+ if (cpufreq_driver->get)
+ cur_freq = cpufreq_driver->get(cpu_policy->cpu);
+
+ if (!cur_freq || !cpu_policy->cur) {
+ printk(KERN_ERR "cpufreq: resume failed to assert current frequency is what timing core thinks it is.\n");
+ goto out;
+ }
+
+ if (unlikely(cur_freq != cpu_policy->cur)) {
+ struct cpufreq_freqs freqs;
+
+ printk(KERN_WARNING "Warning: CPU frequency is %u, "
+ "cpufreq assumed %u kHz.\n", cur_freq, cpu_policy->cur);
+
+ freqs.cpu = cpu;
+ freqs.old = cpu_policy->cur;
+ freqs.new = cur_freq;
+
+ notifier_call_chain(&cpufreq_transition_notifier_list, CPUFREQ_RESUMECHANGE, &freqs);
+ adjust_jiffies(CPUFREQ_RESUMECHANGE, &freqs);
+
+ cpu_policy->cur = cur_freq;
+ }
+ }
+
+out:
+ schedule_work(&cpu_policy->update);
+ cpufreq_cpu_put(cpu_policy);
+ return ret;
+}
+
+static struct sysdev_driver cpufreq_sysdev_driver = {
+ .add = cpufreq_add_dev,
+ .remove = cpufreq_remove_dev,
+ .resume = cpufreq_resume,
+};
+
+
+/*********************************************************************
+ * NOTIFIER LISTS INTERFACE *
+ *********************************************************************/
+
+/**
+ * cpufreq_register_notifier - register a driver with cpufreq
+ * @nb: notifier function to register
+ * @list: CPUFREQ_TRANSITION_NOTIFIER or CPUFREQ_POLICY_NOTIFIER
+ *
+ * Add a driver to one of two lists: either a list of drivers that
+ * are notified about clock rate changes (once before and once after
+ * the transition), or a list of drivers that are notified about
+ * changes in cpufreq policy.
+ *
+ * This function may sleep, and has the same return conditions as
+ * notifier_chain_register.
+ */
+int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list)
+{
+ int ret;
+
+ down_write(&cpufreq_notifier_rwsem);
+ switch (list) {
+ case CPUFREQ_TRANSITION_NOTIFIER:
+ ret = notifier_chain_register(&cpufreq_transition_notifier_list, nb);
+ break;
+ case CPUFREQ_POLICY_NOTIFIER:
+ ret = notifier_chain_register(&cpufreq_policy_notifier_list, nb);
+ break;
+ default:
+ ret = -EINVAL;
+ }
+ up_write(&cpufreq_notifier_rwsem);
+
+ return ret;
+}
+EXPORT_SYMBOL(cpufreq_register_notifier);
+
+
+/**
+ * cpufreq_unregister_notifier - unregister a driver with cpufreq
+ * @nb: notifier block to be unregistered
+ * @list: CPUFREQ_TRANSITION_NOTIFIER or CPUFREQ_POLICY_NOTIFIER
+ *
+ * Remove a driver from the CPU frequency notifier list.
+ *
+ * This function may sleep, and has the same return conditions as
+ * notifier_chain_unregister.
+ */
+int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list)
+{
+ int ret;
+
+ down_write(&cpufreq_notifier_rwsem);
+ switch (list) {
+ case CPUFREQ_TRANSITION_NOTIFIER:
+ ret = notifier_chain_unregister(&cpufreq_transition_notifier_list, nb);
+ break;
+ case CPUFREQ_POLICY_NOTIFIER:
+ ret = notifier_chain_unregister(&cpufreq_policy_notifier_list, nb);
+ break;
+ default:
+ ret = -EINVAL;
+ }
+ up_write(&cpufreq_notifier_rwsem);
+
+ return ret;
+}
+EXPORT_SYMBOL(cpufreq_unregister_notifier);
+
+
+/*********************************************************************
+ * GOVERNORS *
+ *********************************************************************/
+
+
+int __cpufreq_driver_target(struct cpufreq_policy *policy,
+ unsigned int target_freq,
+ unsigned int relation)
+{
+ int retval = -EINVAL;
+ lock_cpu_hotplug();
+ dprintk("target for CPU %u: %u kHz, relation %u\n", policy->cpu,
+ target_freq, relation);
+ if (cpu_online(policy->cpu) && cpufreq_driver->target)
+ retval = cpufreq_driver->target(policy, target_freq, relation);
+ unlock_cpu_hotplug();
+ return retval;
+}
+EXPORT_SYMBOL_GPL(__cpufreq_driver_target);
+
+
+int cpufreq_driver_target(struct cpufreq_policy *policy,
+ unsigned int target_freq,
+ unsigned int relation)
+{
+ unsigned int ret;
+
+ policy = cpufreq_cpu_get(policy->cpu);
+ if (!policy)
+ return -EINVAL;
+
+ down(&policy->lock);
+
+ ret = __cpufreq_driver_target(policy, target_freq, relation);
+
+ up(&policy->lock);
+
+ cpufreq_cpu_put(policy);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(cpufreq_driver_target);
+
+
+static int __cpufreq_governor(struct cpufreq_policy *policy, unsigned int event)
+{
+ int ret = -EINVAL;
+
+ if (!try_module_get(policy->governor->owner))
+ return -EINVAL;
+
+ dprintk("__cpufreq_governor for CPU %u, event %u\n", policy->cpu, event);
+ ret = policy->governor->governor(policy, event);
+
+ /* we keep one module reference alive for each CPU governed by this CPU */
+ if ((event != CPUFREQ_GOV_START) || ret)
+ module_put(policy->governor->owner);
+ if ((event == CPUFREQ_GOV_STOP) && !ret)
+ module_put(policy->governor->owner);
+
+ return ret;
+}
+
+
+int cpufreq_governor(unsigned int cpu, unsigned int event)
+{
+ int ret = 0;
+ struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
+
+ if (!policy)
+ return -EINVAL;
+
+ down(&policy->lock);
+ ret = __cpufreq_governor(policy, event);
+ up(&policy->lock);
+
+ cpufreq_cpu_put(policy);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(cpufreq_governor);
+
+
+int cpufreq_register_governor(struct cpufreq_governor *governor)
+{
+ struct cpufreq_governor *t;
+
+ if (!governor)
+ return -EINVAL;
+
+ down(&cpufreq_governor_sem);
+
+ list_for_each_entry(t, &cpufreq_governor_list, governor_list) {
+ if (!strnicmp(governor->name,t->name,CPUFREQ_NAME_LEN)) {
+ up(&cpufreq_governor_sem);
+ return -EBUSY;
+ }
+ }
+ list_add(&governor->governor_list, &cpufreq_governor_list);
+
+ up(&cpufreq_governor_sem);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(cpufreq_register_governor);
+
+
+void cpufreq_unregister_governor(struct cpufreq_governor *governor)
+{
+ if (!governor)
+ return;
+
+ down(&cpufreq_governor_sem);
+ list_del(&governor->governor_list);
+ up(&cpufreq_governor_sem);
+ return;
+}
+EXPORT_SYMBOL_GPL(cpufreq_unregister_governor);
+
+
+
+/*********************************************************************
+ * POLICY INTERFACE *
+ *********************************************************************/
+
+/**
+ * cpufreq_get_policy - get the current cpufreq_policy
+ * @policy: struct cpufreq_policy into which the current cpufreq_policy is written
+ *
+ * Reads the current cpufreq policy.
+ */
+int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu)
+{
+ struct cpufreq_policy *cpu_policy;
+ if (!policy)
+ return -EINVAL;
+
+ cpu_policy = cpufreq_cpu_get(cpu);
+ if (!cpu_policy)
+ return -EINVAL;
+
+ down(&cpu_policy->lock);
+ memcpy(policy, cpu_policy, sizeof(struct cpufreq_policy));
+ up(&cpu_policy->lock);
+
+ cpufreq_cpu_put(cpu_policy);
+
+ return 0;
+}
+EXPORT_SYMBOL(cpufreq_get_policy);
+
+
+static int __cpufreq_set_policy(struct cpufreq_policy *data, struct cpufreq_policy *policy)
+{
+ int ret = 0;
+
+ cpufreq_debug_disable_ratelimit();
+ dprintk("setting new policy for CPU %u: %u - %u kHz\n", policy->cpu,
+ policy->min, policy->max);
+
+ memcpy(&policy->cpuinfo,
+ &data->cpuinfo,
+ sizeof(struct cpufreq_cpuinfo));
+
+ /* verify the cpu speed can be set within this limit */
+ ret = cpufreq_driver->verify(policy);
+ if (ret)
+ goto error_out;
+
+ down_read(&cpufreq_notifier_rwsem);
+
+ /* adjust if necessary - all reasons */
+ notifier_call_chain(&cpufreq_policy_notifier_list, CPUFREQ_ADJUST,
+ policy);
+
+ /* adjust if necessary - hardware incompatibility*/
+ notifier_call_chain(&cpufreq_policy_notifier_list, CPUFREQ_INCOMPATIBLE,
+ policy);
+
+ /* verify the cpu speed can be set within this limit,
+ which might be different to the first one */
+ ret = cpufreq_driver->verify(policy);
+ if (ret) {
+ up_read(&cpufreq_notifier_rwsem);
+ goto error_out;
+ }
+
+ /* notification of the new policy */
+ notifier_call_chain(&cpufreq_policy_notifier_list, CPUFREQ_NOTIFY,
+ policy);
+
+ up_read(&cpufreq_notifier_rwsem);
+
+ data->min = policy->min;
+ data->max = policy->max;
+
+ dprintk("new min and max freqs are %u - %u kHz\n", data->min, data->max);
+
+ if (cpufreq_driver->setpolicy) {
+ data->policy = policy->policy;
+ dprintk("setting range\n");
+ ret = cpufreq_driver->setpolicy(policy);
+ } else {
+ if (policy->governor != data->governor) {
+ /* save old, working values */
+ struct cpufreq_governor *old_gov = data->governor;
+
+ dprintk("governor switch\n");
+
+ /* end old governor */
+ if (data->governor)
+ __cpufreq_governor(data, CPUFREQ_GOV_STOP);
+
+ /* start new governor */
+ data->governor = policy->governor;
+ if (__cpufreq_governor(data, CPUFREQ_GOV_START)) {
+ /* new governor failed, so re-start old one */
+ dprintk("starting governor %s failed\n", data->governor->name);
+ if (old_gov) {
+ data->governor = old_gov;
+ __cpufreq_governor(data, CPUFREQ_GOV_START);
+ }
+ ret = -EINVAL;
+ goto error_out;
+ }
+ /* might be a policy change, too, so fall through */
+ }
+ dprintk("governor: change or update limits\n");
+ __cpufreq_governor(data, CPUFREQ_GOV_LIMITS);
+ }
+
+ error_out:
+ cpufreq_debug_enable_ratelimit();
+ return ret;
+}
+
+/**
+ * cpufreq_set_policy - set a new CPUFreq policy
+ * @policy: policy to be set.
+ *
+ * Sets a new CPU frequency and voltage scaling policy.
+ */
+int cpufreq_set_policy(struct cpufreq_policy *policy)
+{
+ int ret = 0;
+ struct cpufreq_policy *data;
+
+ if (!policy)
+ return -EINVAL;
+
+ data = cpufreq_cpu_get(policy->cpu);
+ if (!data)
+ return -EINVAL;
+
+ /* lock this CPU */
+ down(&data->lock);
+
+ ret = __cpufreq_set_policy(data, policy);
+ data->user_policy.min = data->min;
+ data->user_policy.max = data->max;
+ data->user_policy.policy = data->policy;
+ data->user_policy.governor = data->governor;
+
+ up(&data->lock);
+ cpufreq_cpu_put(data);
+
+ return ret;
+}
+EXPORT_SYMBOL(cpufreq_set_policy);
+
+
+/**
+ * cpufreq_update_policy - re-evaluate an existing cpufreq policy
+ * @cpu: CPU which shall be re-evaluated
+ *
+ * Usefull for policy notifiers which have different necessities
+ * at different times.
+ */
+int cpufreq_update_policy(unsigned int cpu)
+{
+ struct cpufreq_policy *data = cpufreq_cpu_get(cpu);
+ struct cpufreq_policy policy;
+ int ret = 0;
+
+ if (!data)
+ return -ENODEV;
+
+ down(&data->lock);
+
+ dprintk("updating policy for CPU %u\n", cpu);
+ memcpy(&policy,
+ data,
+ sizeof(struct cpufreq_policy));
+ policy.min = data->user_policy.min;
+ policy.max = data->user_policy.max;
+ policy.policy = data->user_policy.policy;
+ policy.governor = data->user_policy.governor;
+
+ ret = __cpufreq_set_policy(data, &policy);
+
+ up(&data->lock);
+
+ cpufreq_cpu_put(data);
+ return ret;
+}
+EXPORT_SYMBOL(cpufreq_update_policy);
+
+
+/*********************************************************************
+ * REGISTER / UNREGISTER CPUFREQ DRIVER *
+ *********************************************************************/
+
+/**
+ * cpufreq_register_driver - register a CPU Frequency driver
+ * @driver_data: A struct cpufreq_driver containing the values#
+ * submitted by the CPU Frequency driver.
+ *
+ * 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_driver(struct cpufreq_driver *driver_data)
+{
+ unsigned long flags;
+ int ret;
+
+ if (!driver_data || !driver_data->verify || !driver_data->init ||
+ ((!driver_data->setpolicy) && (!driver_data->target)))
+ return -EINVAL;
+
+ dprintk("trying to register driver %s\n", driver_data->name);
+
+ if (driver_data->setpolicy)
+ driver_data->flags |= CPUFREQ_CONST_LOOPS;
+
+ spin_lock_irqsave(&cpufreq_driver_lock, flags);
+ if (cpufreq_driver) {
+ spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
+ return -EBUSY;
+ }
+ cpufreq_driver = driver_data;
+ spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
+
+ ret = sysdev_driver_register(&cpu_sysdev_class,&cpufreq_sysdev_driver);
+
+ if ((!ret) && !(cpufreq_driver->flags & CPUFREQ_STICKY)) {
+ int i;
+ ret = -ENODEV;
+
+ /* check for at least one working CPU */
+ for (i=0; i<NR_CPUS; i++)
+ if (cpufreq_cpu_data[i])
+ ret = 0;
+
+ /* if all ->init() calls failed, unregister */
+ if (ret) {
+ dprintk("no CPU initialized for driver %s\n", driver_data->name);
+ sysdev_driver_unregister(&cpu_sysdev_class, &cpufreq_sysdev_driver);
+
+ spin_lock_irqsave(&cpufreq_driver_lock, flags);
+ cpufreq_driver = NULL;
+ spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
+ }
+ }
+
+ if (!ret) {
+ dprintk("driver %s up and running\n", driver_data->name);
+ cpufreq_debug_enable_ratelimit();
+ }
+
+ return (ret);
+}
+EXPORT_SYMBOL_GPL(cpufreq_register_driver);
+
+
+/**
+ * cpufreq_unregister_driver - unregister the current CPUFreq driver
+ *
+ * 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_driver(struct cpufreq_driver *driver)
+{
+ unsigned long flags;
+
+ cpufreq_debug_disable_ratelimit();
+
+ if (!cpufreq_driver || (driver != cpufreq_driver)) {
+ cpufreq_debug_enable_ratelimit();
+ return -EINVAL;
+ }
+
+ dprintk("unregistering driver %s\n", driver->name);
+
+ sysdev_driver_unregister(&cpu_sysdev_class, &cpufreq_sysdev_driver);
+
+ spin_lock_irqsave(&cpufreq_driver_lock, flags);
+ cpufreq_driver = NULL;
+ spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(cpufreq_unregister_driver);
diff --git a/drivers/cpufreq/cpufreq_ondemand.c b/drivers/cpufreq/cpufreq_ondemand.c
new file mode 100644
index 000000000000..8d83a21c6477
--- /dev/null
+++ b/drivers/cpufreq/cpufreq_ondemand.c
@@ -0,0 +1,491 @@
+/*
+ * drivers/cpufreq/cpufreq_ondemand.c
+ *
+ * Copyright (C) 2001 Russell King
+ * (C) 2003 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>.
+ * Jun Nakajima <jun.nakajima@intel.com>
+ *
+ * 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 <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/smp.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/ctype.h>
+#include <linux/cpufreq.h>
+#include <linux/sysctl.h>
+#include <linux/types.h>
+#include <linux/fs.h>
+#include <linux/sysfs.h>
+#include <linux/sched.h>
+#include <linux/kmod.h>
+#include <linux/workqueue.h>
+#include <linux/jiffies.h>
+#include <linux/kernel_stat.h>
+#include <linux/percpu.h>
+
+/*
+ * dbs is used in this file as a shortform for demandbased switching
+ * It helps to keep variable names smaller, simpler
+ */
+
+#define DEF_FREQUENCY_UP_THRESHOLD (80)
+#define MIN_FREQUENCY_UP_THRESHOLD (0)
+#define MAX_FREQUENCY_UP_THRESHOLD (100)
+
+#define DEF_FREQUENCY_DOWN_THRESHOLD (20)
+#define MIN_FREQUENCY_DOWN_THRESHOLD (0)
+#define MAX_FREQUENCY_DOWN_THRESHOLD (100)
+
+/*
+ * The polling frequency of this governor depends on the capability of
+ * the processor. Default polling frequency is 1000 times the transition
+ * latency of the processor. The governor will work on any processor with
+ * transition latency <= 10mS, using appropriate sampling
+ * rate.
+ * For CPUs with transition latency > 10mS (mostly drivers with CPUFREQ_ETERNAL)
+ * this governor will not work.
+ * All times here are in uS.
+ */
+static unsigned int def_sampling_rate;
+#define MIN_SAMPLING_RATE (def_sampling_rate / 2)
+#define MAX_SAMPLING_RATE (500 * def_sampling_rate)
+#define DEF_SAMPLING_RATE_LATENCY_MULTIPLIER (1000)
+#define DEF_SAMPLING_DOWN_FACTOR (10)
+#define TRANSITION_LATENCY_LIMIT (10 * 1000)
+#define sampling_rate_in_HZ(x) (((x * HZ) < (1000 * 1000))?1:((x * HZ) / (1000 * 1000)))
+
+static void do_dbs_timer(void *data);
+
+struct cpu_dbs_info_s {
+ struct cpufreq_policy *cur_policy;
+ unsigned int prev_cpu_idle_up;
+ unsigned int prev_cpu_idle_down;
+ unsigned int enable;
+};
+static DEFINE_PER_CPU(struct cpu_dbs_info_s, cpu_dbs_info);
+
+static unsigned int dbs_enable; /* number of CPUs using this policy */
+
+static DECLARE_MUTEX (dbs_sem);
+static DECLARE_WORK (dbs_work, do_dbs_timer, NULL);
+
+struct dbs_tuners {
+ unsigned int sampling_rate;
+ unsigned int sampling_down_factor;
+ unsigned int up_threshold;
+ unsigned int down_threshold;
+};
+
+static struct dbs_tuners dbs_tuners_ins = {
+ .up_threshold = DEF_FREQUENCY_UP_THRESHOLD,
+ .down_threshold = DEF_FREQUENCY_DOWN_THRESHOLD,
+ .sampling_down_factor = DEF_SAMPLING_DOWN_FACTOR,
+};
+
+/************************** sysfs interface ************************/
+static ssize_t show_sampling_rate_max(struct cpufreq_policy *policy, char *buf)
+{
+ return sprintf (buf, "%u\n", MAX_SAMPLING_RATE);
+}
+
+static ssize_t show_sampling_rate_min(struct cpufreq_policy *policy, char *buf)
+{
+ return sprintf (buf, "%u\n", MIN_SAMPLING_RATE);
+}
+
+#define define_one_ro(_name) \
+static struct freq_attr _name = \
+__ATTR(_name, 0444, show_##_name, NULL)
+
+define_one_ro(sampling_rate_max);
+define_one_ro(sampling_rate_min);
+
+/* cpufreq_ondemand Governor Tunables */
+#define show_one(file_name, object) \
+static ssize_t show_##file_name \
+(struct cpufreq_policy *unused, char *buf) \
+{ \
+ return sprintf(buf, "%u\n", dbs_tuners_ins.object); \
+}
+show_one(sampling_rate, sampling_rate);
+show_one(sampling_down_factor, sampling_down_factor);
+show_one(up_threshold, up_threshold);
+show_one(down_threshold, down_threshold);
+
+static ssize_t store_sampling_down_factor(struct cpufreq_policy *unused,
+ const char *buf, size_t count)
+{
+ unsigned int input;
+ int ret;
+ ret = sscanf (buf, "%u", &input);
+ if (ret != 1 )
+ return -EINVAL;
+
+ down(&dbs_sem);
+ dbs_tuners_ins.sampling_down_factor = input;
+ up(&dbs_sem);
+
+ return count;
+}
+
+static ssize_t store_sampling_rate(struct cpufreq_policy *unused,
+ const char *buf, size_t count)
+{
+ unsigned int input;
+ int ret;
+ ret = sscanf (buf, "%u", &input);
+
+ down(&dbs_sem);
+ if (ret != 1 || input > MAX_SAMPLING_RATE || input < MIN_SAMPLING_RATE) {
+ up(&dbs_sem);
+ return -EINVAL;
+ }
+
+ dbs_tuners_ins.sampling_rate = input;
+ up(&dbs_sem);
+
+ return count;
+}
+
+static ssize_t store_up_threshold(struct cpufreq_policy *unused,
+ const char *buf, size_t count)
+{
+ unsigned int input;
+ int ret;
+ ret = sscanf (buf, "%u", &input);
+
+ down(&dbs_sem);
+ if (ret != 1 || input > MAX_FREQUENCY_UP_THRESHOLD ||
+ input < MIN_FREQUENCY_UP_THRESHOLD ||
+ input <= dbs_tuners_ins.down_threshold) {
+ up(&dbs_sem);
+ return -EINVAL;
+ }
+
+ dbs_tuners_ins.up_threshold = input;
+ up(&dbs_sem);
+
+ return count;
+}
+
+static ssize_t store_down_threshold(struct cpufreq_policy *unused,
+ const char *buf, size_t count)
+{
+ unsigned int input;
+ int ret;
+ ret = sscanf (buf, "%u", &input);
+
+ down(&dbs_sem);
+ if (ret != 1 || input > MAX_FREQUENCY_DOWN_THRESHOLD ||
+ input < MIN_FREQUENCY_DOWN_THRESHOLD ||
+ input >= dbs_tuners_ins.up_threshold) {
+ up(&dbs_sem);
+ return -EINVAL;
+ }
+
+ dbs_tuners_ins.down_threshold = input;
+ up(&dbs_sem);
+
+ return count;
+}
+
+#define define_one_rw(_name) \
+static struct freq_attr _name = \
+__ATTR(_name, 0644, show_##_name, store_##_name)
+
+define_one_rw(sampling_rate);
+define_one_rw(sampling_down_factor);
+define_one_rw(up_threshold);
+define_one_rw(down_threshold);
+
+static struct attribute * dbs_attributes[] = {
+ &sampling_rate_max.attr,
+ &sampling_rate_min.attr,
+ &sampling_rate.attr,
+ &sampling_down_factor.attr,
+ &up_threshold.attr,
+ &down_threshold.attr,
+ NULL
+};
+
+static struct attribute_group dbs_attr_group = {
+ .attrs = dbs_attributes,
+ .name = "ondemand",
+};
+
+/************************** sysfs end ************************/
+
+static void dbs_check_cpu(int cpu)
+{
+ unsigned int idle_ticks, up_idle_ticks, down_idle_ticks;
+ unsigned int total_idle_ticks;
+ unsigned int freq_down_step;
+ unsigned int freq_down_sampling_rate;
+ static int down_skip[NR_CPUS];
+ struct cpu_dbs_info_s *this_dbs_info;
+
+ struct cpufreq_policy *policy;
+ unsigned int j;
+
+ this_dbs_info = &per_cpu(cpu_dbs_info, cpu);
+ if (!this_dbs_info->enable)
+ return;
+
+ policy = this_dbs_info->cur_policy;
+ /*
+ * The default safe range is 20% to 80%
+ * Every sampling_rate, we check
+ * - If current idle time is less than 20%, then we try to
+ * increase frequency
+ * Every sampling_rate*sampling_down_factor, we check
+ * - If current idle time is more than 80%, then we try to
+ * decrease frequency
+ *
+ * Any frequency increase takes it to the maximum frequency.
+ * Frequency reduction happens at minimum steps of
+ * 5% of max_frequency
+ */
+
+ /* Check for frequency increase */
+ total_idle_ticks = kstat_cpu(cpu).cpustat.idle +
+ kstat_cpu(cpu).cpustat.iowait;
+ idle_ticks = total_idle_ticks -
+ this_dbs_info->prev_cpu_idle_up;
+ this_dbs_info->prev_cpu_idle_up = total_idle_ticks;
+
+
+ for_each_cpu_mask(j, policy->cpus) {
+ unsigned int tmp_idle_ticks;
+ struct cpu_dbs_info_s *j_dbs_info;
+
+ if (j == cpu)
+ continue;
+
+ j_dbs_info = &per_cpu(cpu_dbs_info, j);
+ /* Check for frequency increase */
+ total_idle_ticks = kstat_cpu(j).cpustat.idle +
+ kstat_cpu(j).cpustat.iowait;
+ tmp_idle_ticks = total_idle_ticks -
+ j_dbs_info->prev_cpu_idle_up;
+ j_dbs_info->prev_cpu_idle_up = total_idle_ticks;
+
+ if (tmp_idle_ticks < idle_ticks)
+ idle_ticks = tmp_idle_ticks;
+ }
+
+ /* Scale idle ticks by 100 and compare with up and down ticks */
+ idle_ticks *= 100;
+ up_idle_ticks = (100 - dbs_tuners_ins.up_threshold) *
+ sampling_rate_in_HZ(dbs_tuners_ins.sampling_rate);
+
+ if (idle_ticks < up_idle_ticks) {
+ __cpufreq_driver_target(policy, policy->max,
+ CPUFREQ_RELATION_H);
+ down_skip[cpu] = 0;
+ this_dbs_info->prev_cpu_idle_down = total_idle_ticks;
+ return;
+ }
+
+ /* Check for frequency decrease */
+ down_skip[cpu]++;
+ if (down_skip[cpu] < dbs_tuners_ins.sampling_down_factor)
+ return;
+
+ total_idle_ticks = kstat_cpu(cpu).cpustat.idle +
+ kstat_cpu(cpu).cpustat.iowait;
+ idle_ticks = total_idle_ticks -
+ this_dbs_info->prev_cpu_idle_down;
+ this_dbs_info->prev_cpu_idle_down = total_idle_ticks;
+
+ for_each_cpu_mask(j, policy->cpus) {
+ unsigned int tmp_idle_ticks;
+ struct cpu_dbs_info_s *j_dbs_info;
+
+ if (j == cpu)
+ continue;
+
+ j_dbs_info = &per_cpu(cpu_dbs_info, j);
+ /* Check for frequency increase */
+ total_idle_ticks = kstat_cpu(j).cpustat.idle +
+ kstat_cpu(j).cpustat.iowait;
+ tmp_idle_ticks = total_idle_ticks -
+ j_dbs_info->prev_cpu_idle_down;
+ j_dbs_info->prev_cpu_idle_down = total_idle_ticks;
+
+ if (tmp_idle_ticks < idle_ticks)
+ idle_ticks = tmp_idle_ticks;
+ }
+
+ /* Scale idle ticks by 100 and compare with up and down ticks */
+ idle_ticks *= 100;
+ down_skip[cpu] = 0;
+
+ freq_down_sampling_rate = dbs_tuners_ins.sampling_rate *
+ dbs_tuners_ins.sampling_down_factor;
+ down_idle_ticks = (100 - dbs_tuners_ins.down_threshold) *
+ sampling_rate_in_HZ(freq_down_sampling_rate);
+
+ if (idle_ticks > down_idle_ticks ) {
+ freq_down_step = (5 * policy->max) / 100;
+
+ /* max freq cannot be less than 100. But who knows.... */
+ if (unlikely(freq_down_step == 0))
+ freq_down_step = 5;
+
+ __cpufreq_driver_target(policy,
+ policy->cur - freq_down_step,
+ CPUFREQ_RELATION_H);
+ return;
+ }
+}
+
+static void do_dbs_timer(void *data)
+{
+ int i;
+ down(&dbs_sem);
+ for (i = 0; i < NR_CPUS; i++)
+ if (cpu_online(i))
+ dbs_check_cpu(i);
+ schedule_delayed_work(&dbs_work,
+ sampling_rate_in_HZ(dbs_tuners_ins.sampling_rate));
+ up(&dbs_sem);
+}
+
+static inline void dbs_timer_init(void)
+{
+ INIT_WORK(&dbs_work, do_dbs_timer, NULL);
+ schedule_delayed_work(&dbs_work,
+ sampling_rate_in_HZ(dbs_tuners_ins.sampling_rate));
+ return;
+}
+
+static inline void dbs_timer_exit(void)
+{
+ cancel_delayed_work(&dbs_work);
+ return;
+}
+
+static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
+ unsigned int event)
+{
+ unsigned int cpu = policy->cpu;
+ struct cpu_dbs_info_s *this_dbs_info;
+ unsigned int j;
+
+ this_dbs_info = &per_cpu(cpu_dbs_info, cpu);
+
+ switch (event) {
+ case CPUFREQ_GOV_START:
+ if ((!cpu_online(cpu)) ||
+ (!policy->cur))
+ return -EINVAL;
+
+ if (policy->cpuinfo.transition_latency >
+ (TRANSITION_LATENCY_LIMIT * 1000))
+ return -EINVAL;
+ if (this_dbs_info->enable) /* Already enabled */
+ break;
+
+ down(&dbs_sem);
+ for_each_cpu_mask(j, policy->cpus) {
+ struct cpu_dbs_info_s *j_dbs_info;
+ j_dbs_info = &per_cpu(cpu_dbs_info, j);
+ j_dbs_info->cur_policy = policy;
+
+ j_dbs_info->prev_cpu_idle_up =
+ kstat_cpu(j).cpustat.idle +
+ kstat_cpu(j).cpustat.iowait;
+ j_dbs_info->prev_cpu_idle_down =
+ kstat_cpu(j).cpustat.idle +
+ kstat_cpu(j).cpustat.iowait;
+ }
+ this_dbs_info->enable = 1;
+ sysfs_create_group(&policy->kobj, &dbs_attr_group);
+ dbs_enable++;
+ /*
+ * Start the timerschedule work, when this governor
+ * is used for first time
+ */
+ if (dbs_enable == 1) {
+ unsigned int latency;
+ /* policy latency is in nS. Convert it to uS first */
+
+ latency = policy->cpuinfo.transition_latency;
+ if (latency < 1000)
+ latency = 1000;
+
+ def_sampling_rate = (latency / 1000) *
+ DEF_SAMPLING_RATE_LATENCY_MULTIPLIER;
+ dbs_tuners_ins.sampling_rate = def_sampling_rate;
+
+ dbs_timer_init();
+ }
+
+ up(&dbs_sem);
+ break;
+
+ case CPUFREQ_GOV_STOP:
+ down(&dbs_sem);
+ this_dbs_info->enable = 0;
+ sysfs_remove_group(&policy->kobj, &dbs_attr_group);
+ dbs_enable--;
+ /*
+ * Stop the timerschedule work, when this governor
+ * is used for first time
+ */
+ if (dbs_enable == 0)
+ dbs_timer_exit();
+
+ up(&dbs_sem);
+
+ break;
+
+ case CPUFREQ_GOV_LIMITS:
+ down(&dbs_sem);
+ if (policy->max < this_dbs_info->cur_policy->cur)
+ __cpufreq_driver_target(
+ this_dbs_info->cur_policy,
+ policy->max, CPUFREQ_RELATION_H);
+ else if (policy->min > this_dbs_info->cur_policy->cur)
+ __cpufreq_driver_target(
+ this_dbs_info->cur_policy,
+ policy->min, CPUFREQ_RELATION_L);
+ up(&dbs_sem);
+ break;
+ }
+ return 0;
+}
+
+struct cpufreq_governor cpufreq_gov_dbs = {
+ .name = "ondemand",
+ .governor = cpufreq_governor_dbs,
+ .owner = THIS_MODULE,
+};
+EXPORT_SYMBOL(cpufreq_gov_dbs);
+
+static int __init cpufreq_gov_dbs_init(void)
+{
+ return cpufreq_register_governor(&cpufreq_gov_dbs);
+}
+
+static void __exit cpufreq_gov_dbs_exit(void)
+{
+ /* Make sure that the scheduled work is indeed not running */
+ flush_scheduled_work();
+
+ cpufreq_unregister_governor(&cpufreq_gov_dbs);
+}
+
+
+MODULE_AUTHOR ("Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>");
+MODULE_DESCRIPTION ("'cpufreq_ondemand' - A dynamic cpufreq governor for "
+ "Low Latency Frequency Transition capable processors");
+MODULE_LICENSE ("GPL");
+
+module_init(cpufreq_gov_dbs_init);
+module_exit(cpufreq_gov_dbs_exit);
diff --git a/drivers/cpufreq/cpufreq_performance.c b/drivers/cpufreq/cpufreq_performance.c
new file mode 100644
index 000000000000..8d536b40deb8
--- /dev/null
+++ b/drivers/cpufreq/cpufreq_performance.c
@@ -0,0 +1,61 @@
+/*
+ * linux/drivers/cpufreq/cpufreq_performance.c
+ *
+ * Copyright (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de>
+ *
+ *
+ * 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 <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/cpufreq.h>
+#include <linux/init.h>
+
+#define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_GOVERNOR, "performance", msg)
+
+
+static int cpufreq_governor_performance(struct cpufreq_policy *policy,
+ unsigned int event)
+{
+ switch (event) {
+ case CPUFREQ_GOV_START:
+ case CPUFREQ_GOV_LIMITS:
+ dprintk("setting to %u kHz because of event %u\n", policy->max, event);
+ __cpufreq_driver_target(policy, policy->max, CPUFREQ_RELATION_H);
+ break;
+ default:
+ break;
+ }
+ return 0;
+}
+
+struct cpufreq_governor cpufreq_gov_performance = {
+ .name = "performance",
+ .governor = cpufreq_governor_performance,
+ .owner = THIS_MODULE,
+};
+EXPORT_SYMBOL(cpufreq_gov_performance);
+
+
+static int __init cpufreq_gov_performance_init(void)
+{
+ return cpufreq_register_governor(&cpufreq_gov_performance);
+}
+
+
+static void __exit cpufreq_gov_performance_exit(void)
+{
+ cpufreq_unregister_governor(&cpufreq_gov_performance);
+}
+
+
+MODULE_AUTHOR("Dominik Brodowski <linux@brodo.de>");
+MODULE_DESCRIPTION("CPUfreq policy governor 'performance'");
+MODULE_LICENSE("GPL");
+
+fs_initcall(cpufreq_gov_performance_init);
+module_exit(cpufreq_gov_performance_exit);
diff --git a/drivers/cpufreq/cpufreq_powersave.c b/drivers/cpufreq/cpufreq_powersave.c
new file mode 100644
index 000000000000..c85edda7feb0
--- /dev/null
+++ b/drivers/cpufreq/cpufreq_powersave.c
@@ -0,0 +1,59 @@
+/*
+ * linux/drivers/cpufreq/cpufreq_powersave.c
+ *
+ * Copyright (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de>
+ *
+ *
+ * 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 <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/cpufreq.h>
+#include <linux/init.h>
+
+#define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_GOVERNOR, "powersave", msg)
+
+static int cpufreq_governor_powersave(struct cpufreq_policy *policy,
+ unsigned int event)
+{
+ switch (event) {
+ case CPUFREQ_GOV_START:
+ case CPUFREQ_GOV_LIMITS:
+ dprintk("setting to %u kHz because of event %u\n", policy->min, event);
+ __cpufreq_driver_target(policy, policy->min, CPUFREQ_RELATION_L);
+ break;
+ default:
+ break;
+ }
+ return 0;
+}
+
+static struct cpufreq_governor cpufreq_gov_powersave = {
+ .name = "powersave",
+ .governor = cpufreq_governor_powersave,
+ .owner = THIS_MODULE,
+};
+
+
+static int __init cpufreq_gov_powersave_init(void)
+{
+ return cpufreq_register_governor(&cpufreq_gov_powersave);
+}
+
+
+static void __exit cpufreq_gov_powersave_exit(void)
+{
+ cpufreq_unregister_governor(&cpufreq_gov_powersave);
+}
+
+
+MODULE_AUTHOR("Dominik Brodowski <linux@brodo.de>");
+MODULE_DESCRIPTION("CPUfreq policy governor 'powersave'");
+MODULE_LICENSE("GPL");
+
+module_init(cpufreq_gov_powersave_init);
+module_exit(cpufreq_gov_powersave_exit);
diff --git a/drivers/cpufreq/cpufreq_stats.c b/drivers/cpufreq/cpufreq_stats.c
new file mode 100644
index 000000000000..2084593937c6
--- /dev/null
+++ b/drivers/cpufreq/cpufreq_stats.c
@@ -0,0 +1,334 @@
+/*
+ * drivers/cpufreq/cpufreq_stats.c
+ *
+ * Copyright (C) 2003-2004 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>.
+ * (C) 2004 Zou Nan hai <nanhai.zou@intel.com>.
+ *
+ * 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 <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/sysdev.h>
+#include <linux/cpu.h>
+#include <linux/sysfs.h>
+#include <linux/cpufreq.h>
+#include <linux/jiffies.h>
+#include <linux/percpu.h>
+#include <linux/kobject.h>
+#include <linux/spinlock.h>
+
+static spinlock_t cpufreq_stats_lock;
+
+#define CPUFREQ_STATDEVICE_ATTR(_name,_mode,_show) \
+static struct freq_attr _attr_##_name = {\
+ .attr = {.name = __stringify(_name), .owner = THIS_MODULE, \
+ .mode = _mode, }, \
+ .show = _show,\
+};
+
+static unsigned long
+delta_time(unsigned long old, unsigned long new)
+{
+ return (old > new) ? (old - new): (new + ~old + 1);
+}
+
+struct cpufreq_stats {
+ unsigned int cpu;
+ unsigned int total_trans;
+ unsigned long long last_time;
+ unsigned int max_state;
+ unsigned int state_num;
+ unsigned int last_index;
+ unsigned long long *time_in_state;
+ unsigned int *freq_table;
+#ifdef CONFIG_CPU_FREQ_STAT_DETAILS
+ unsigned int *trans_table;
+#endif
+};
+
+static struct cpufreq_stats *cpufreq_stats_table[NR_CPUS];
+
+struct cpufreq_stats_attribute {
+ struct attribute attr;
+ ssize_t(*show) (struct cpufreq_stats *, char *);
+};
+
+static int
+cpufreq_stats_update (unsigned int cpu)
+{
+ struct cpufreq_stats *stat;
+ spin_lock(&cpufreq_stats_lock);
+ stat = cpufreq_stats_table[cpu];
+ if (stat->time_in_state)
+ stat->time_in_state[stat->last_index] +=
+ delta_time(stat->last_time, jiffies);
+ stat->last_time = jiffies;
+ spin_unlock(&cpufreq_stats_lock);
+ return 0;
+}
+
+static ssize_t
+show_total_trans(struct cpufreq_policy *policy, char *buf)
+{
+ struct cpufreq_stats *stat = cpufreq_stats_table[policy->cpu];
+ if(!stat)
+ return 0;
+ return sprintf(buf, "%d\n",
+ cpufreq_stats_table[stat->cpu]->total_trans);
+}
+
+static ssize_t
+show_time_in_state(struct cpufreq_policy *policy, char *buf)
+{
+ ssize_t len = 0;
+ int i;
+ struct cpufreq_stats *stat = cpufreq_stats_table[policy->cpu];
+ if(!stat)
+ return 0;
+ cpufreq_stats_update(stat->cpu);
+ for (i = 0; i < stat->state_num; i++) {
+ len += sprintf(buf + len, "%u %llu\n",
+ stat->freq_table[i], stat->time_in_state[i]);
+ }
+ return len;
+}
+
+#ifdef CONFIG_CPU_FREQ_STAT_DETAILS
+static ssize_t
+show_trans_table(struct cpufreq_policy *policy, char *buf)
+{
+ ssize_t len = 0;
+ int i, j;
+
+ struct cpufreq_stats *stat = cpufreq_stats_table[policy->cpu];
+ if(!stat)
+ return 0;
+ cpufreq_stats_update(stat->cpu);
+ for (i = 0; i < stat->state_num; i++) {
+ if (len >= PAGE_SIZE)
+ break;
+ len += snprintf(buf + len, PAGE_SIZE - len, "%9u:\t",
+ stat->freq_table[i]);
+
+ for (j = 0; j < stat->state_num; j++) {
+ if (len >= PAGE_SIZE)
+ break;
+ len += snprintf(buf + len, PAGE_SIZE - len, "%u\t",
+ stat->trans_table[i*stat->max_state+j]);
+ }
+ len += snprintf(buf + len, PAGE_SIZE - len, "\n");
+ }
+ return len;
+}
+CPUFREQ_STATDEVICE_ATTR(trans_table,0444,show_trans_table);
+#endif
+
+CPUFREQ_STATDEVICE_ATTR(total_trans,0444,show_total_trans);
+CPUFREQ_STATDEVICE_ATTR(time_in_state,0444,show_time_in_state);
+
+static struct attribute *default_attrs[] = {
+ &_attr_total_trans.attr,
+ &_attr_time_in_state.attr,
+#ifdef CONFIG_CPU_FREQ_STAT_DETAILS
+ &_attr_trans_table.attr,
+#endif
+ NULL
+};
+static struct attribute_group stats_attr_group = {
+ .attrs = default_attrs,
+ .name = "stats"
+};
+
+static int
+freq_table_get_index(struct cpufreq_stats *stat, unsigned int freq)
+{
+ int index;
+ for (index = 0; index < stat->max_state; index++)
+ if (stat->freq_table[index] == freq)
+ return index;
+ return -1;
+}
+
+static void
+cpufreq_stats_free_table (unsigned int cpu)
+{
+ struct cpufreq_stats *stat = cpufreq_stats_table[cpu];
+ struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
+ if (policy && policy->cpu == cpu)
+ sysfs_remove_group(&policy->kobj, &stats_attr_group);
+ if (stat) {
+ kfree(stat->time_in_state);
+ kfree(stat);
+ }
+ cpufreq_stats_table[cpu] = NULL;
+ if (policy)
+ cpufreq_cpu_put(policy);
+}
+
+static int
+cpufreq_stats_create_table (struct cpufreq_policy *policy,
+ struct cpufreq_frequency_table *table)
+{
+ unsigned int i, j, count = 0, ret = 0;
+ struct cpufreq_stats *stat;
+ struct cpufreq_policy *data;
+ unsigned int alloc_size;
+ unsigned int cpu = policy->cpu;
+ if (cpufreq_stats_table[cpu])
+ return -EBUSY;
+ if ((stat = kmalloc(sizeof(struct cpufreq_stats), GFP_KERNEL)) == NULL)
+ return -ENOMEM;
+ memset(stat, 0, sizeof (struct cpufreq_stats));
+
+ data = cpufreq_cpu_get(cpu);
+ if ((ret = sysfs_create_group(&data->kobj, &stats_attr_group)))
+ goto error_out;
+
+ stat->cpu = cpu;
+ cpufreq_stats_table[cpu] = stat;
+
+ for (i=0; table[i].frequency != CPUFREQ_TABLE_END; i++) {
+ unsigned int freq = table[i].frequency;
+ if (freq == CPUFREQ_ENTRY_INVALID)
+ continue;
+ count++;
+ }
+
+ alloc_size = count * sizeof(int) + count * sizeof(long long);
+
+#ifdef CONFIG_CPU_FREQ_STAT_DETAILS
+ alloc_size += count * count * sizeof(int);
+#endif
+ stat->max_state = count;
+ stat->time_in_state = kmalloc(alloc_size, GFP_KERNEL);
+ if (!stat->time_in_state) {
+ ret = -ENOMEM;
+ goto error_out;
+ }
+ memset(stat->time_in_state, 0, alloc_size);
+ stat->freq_table = (unsigned int *)(stat->time_in_state + count);
+
+#ifdef CONFIG_CPU_FREQ_STAT_DETAILS
+ stat->trans_table = stat->freq_table + count;
+#endif
+ j = 0;
+ for (i = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) {
+ unsigned int freq = table[i].frequency;
+ if (freq == CPUFREQ_ENTRY_INVALID)
+ continue;
+ if (freq_table_get_index(stat, freq) == -1)
+ stat->freq_table[j++] = freq;
+ }
+ stat->state_num = j;
+ spin_lock(&cpufreq_stats_lock);
+ stat->last_time = jiffies;
+ stat->last_index = freq_table_get_index(stat, policy->cur);
+ spin_unlock(&cpufreq_stats_lock);
+ cpufreq_cpu_put(data);
+ return 0;
+error_out:
+ cpufreq_cpu_put(data);
+ kfree(stat);
+ cpufreq_stats_table[cpu] = NULL;
+ return ret;
+}
+
+static int
+cpufreq_stat_notifier_policy (struct notifier_block *nb, unsigned long val,
+ void *data)
+{
+ int ret;
+ struct cpufreq_policy *policy = data;
+ struct cpufreq_frequency_table *table;
+ unsigned int cpu = policy->cpu;
+ if (val != CPUFREQ_NOTIFY)
+ return 0;
+ table = cpufreq_frequency_get_table(cpu);
+ if (!table)
+ return 0;
+ if ((ret = cpufreq_stats_create_table(policy, table)))
+ return ret;
+ return 0;
+}
+
+static int
+cpufreq_stat_notifier_trans (struct notifier_block *nb, unsigned long val,
+ void *data)
+{
+ struct cpufreq_freqs *freq = data;
+ struct cpufreq_stats *stat;
+ int old_index, new_index;
+
+ if (val != CPUFREQ_POSTCHANGE)
+ return 0;
+
+ stat = cpufreq_stats_table[freq->cpu];
+ if (!stat)
+ return 0;
+ old_index = freq_table_get_index(stat, freq->old);
+ new_index = freq_table_get_index(stat, freq->new);
+
+ cpufreq_stats_update(freq->cpu);
+ if (old_index == new_index)
+ return 0;
+
+ spin_lock(&cpufreq_stats_lock);
+ stat->last_index = new_index;
+#ifdef CONFIG_CPU_FREQ_STAT_DETAILS
+ stat->trans_table[old_index * stat->max_state + new_index]++;
+#endif
+ stat->total_trans++;
+ spin_unlock(&cpufreq_stats_lock);
+ return 0;
+}
+
+static struct notifier_block notifier_policy_block = {
+ .notifier_call = cpufreq_stat_notifier_policy
+};
+
+static struct notifier_block notifier_trans_block = {
+ .notifier_call = cpufreq_stat_notifier_trans
+};
+
+static int
+__init cpufreq_stats_init(void)
+{
+ int ret;
+ unsigned int cpu;
+ spin_lock_init(&cpufreq_stats_lock);
+ if ((ret = cpufreq_register_notifier(&notifier_policy_block,
+ CPUFREQ_POLICY_NOTIFIER)))
+ return ret;
+
+ if ((ret = cpufreq_register_notifier(&notifier_trans_block,
+ CPUFREQ_TRANSITION_NOTIFIER))) {
+ cpufreq_unregister_notifier(&notifier_policy_block,
+ CPUFREQ_POLICY_NOTIFIER);
+ return ret;
+ }
+
+ for_each_cpu(cpu)
+ cpufreq_update_policy(cpu);
+ return 0;
+}
+static void
+__exit cpufreq_stats_exit(void)
+{
+ unsigned int cpu;
+ cpufreq_unregister_notifier(&notifier_policy_block,
+ CPUFREQ_POLICY_NOTIFIER);
+ cpufreq_unregister_notifier(&notifier_trans_block,
+ CPUFREQ_TRANSITION_NOTIFIER);
+ for_each_cpu(cpu)
+ cpufreq_stats_free_table(cpu);
+}
+
+MODULE_AUTHOR ("Zou Nan hai <nanhai.zou@intel.com>");
+MODULE_DESCRIPTION ("'cpufreq_stats' - A driver to export cpufreq stats through sysfs filesystem");
+MODULE_LICENSE ("GPL");
+
+module_init(cpufreq_stats_init);
+module_exit(cpufreq_stats_exit);
diff --git a/drivers/cpufreq/cpufreq_userspace.c b/drivers/cpufreq/cpufreq_userspace.c
new file mode 100644
index 000000000000..d32bf3593cd3
--- /dev/null
+++ b/drivers/cpufreq/cpufreq_userspace.c
@@ -0,0 +1,207 @@
+/*
+ * linux/drivers/cpufreq/cpufreq_userspace.c
+ *
+ * Copyright (C) 2001 Russell King
+ * (C) 2002 - 2004 Dominik Brodowski <linux@brodo.de>
+ *
+ * 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 <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/smp.h>
+#include <linux/init.h>
+#include <linux/spinlock.h>
+#include <linux/interrupt.h>
+#include <linux/cpufreq.h>
+#include <linux/types.h>
+#include <linux/fs.h>
+#include <linux/sysfs.h>
+
+#include <asm/uaccess.h>
+
+
+/**
+ * A few values needed by the userspace governor
+ */
+static unsigned int cpu_max_freq[NR_CPUS];
+static unsigned int cpu_min_freq[NR_CPUS];
+static unsigned int cpu_cur_freq[NR_CPUS]; /* current CPU freq */
+static unsigned int cpu_set_freq[NR_CPUS]; /* CPU freq desired by userspace */
+static unsigned int cpu_is_managed[NR_CPUS];
+static struct cpufreq_policy current_policy[NR_CPUS];
+
+static DECLARE_MUTEX (userspace_sem);
+
+#define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_GOVERNOR, "userspace", msg)
+
+/* keep track of frequency transitions */
+static int
+userspace_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
+ void *data)
+{
+ struct cpufreq_freqs *freq = data;
+
+ dprintk("saving cpu_cur_freq of cpu %u to be %u kHz\n", freq->cpu, freq->new);
+ cpu_cur_freq[freq->cpu] = freq->new;
+
+ return 0;
+}
+
+static struct notifier_block userspace_cpufreq_notifier_block = {
+ .notifier_call = userspace_cpufreq_notifier
+};
+
+
+/**
+ * cpufreq_set - set the CPU frequency
+ * @freq: target frequency in kHz
+ * @cpu: CPU for which the frequency is to be set
+ *
+ * Sets the CPU frequency to freq.
+ */
+static int cpufreq_set(unsigned int freq, unsigned int cpu)
+{
+ int ret = -EINVAL;
+
+ dprintk("cpufreq_set for cpu %u, freq %u kHz\n", cpu, freq);
+
+ down(&userspace_sem);
+ if (!cpu_is_managed[cpu])
+ goto err;
+
+ cpu_set_freq[cpu] = freq;
+
+ if (freq < cpu_min_freq[cpu])
+ freq = cpu_min_freq[cpu];
+ if (freq > cpu_max_freq[cpu])
+ freq = cpu_max_freq[cpu];
+
+ /*
+ * We're safe from concurrent calls to ->target() here
+ * as we hold the userspace_sem lock. If we were calling
+ * cpufreq_driver_target, a deadlock situation might occur:
+ * A: cpufreq_set (lock userspace_sem) -> cpufreq_driver_target(lock policy->lock)
+ * B: cpufreq_set_policy(lock policy->lock) -> __cpufreq_governor -> cpufreq_governor_userspace (lock userspace_sem)
+ */
+ ret = __cpufreq_driver_target(&current_policy[cpu], freq,
+ CPUFREQ_RELATION_L);
+
+ err:
+ up(&userspace_sem);
+ return ret;
+}
+
+
+/************************** sysfs interface ************************/
+static ssize_t show_speed (struct cpufreq_policy *policy, char *buf)
+{
+ return sprintf (buf, "%u\n", cpu_cur_freq[policy->cpu]);
+}
+
+static ssize_t
+store_speed (struct cpufreq_policy *policy, const char *buf, size_t count)
+{
+ unsigned int freq = 0;
+ unsigned int ret;
+
+ ret = sscanf (buf, "%u", &freq);
+ if (ret != 1)
+ return -EINVAL;
+
+ cpufreq_set(freq, policy->cpu);
+
+ return count;
+}
+
+static struct freq_attr freq_attr_scaling_setspeed =
+{
+ .attr = { .name = "scaling_setspeed", .mode = 0644, .owner = THIS_MODULE },
+ .show = show_speed,
+ .store = store_speed,
+};
+
+static int cpufreq_governor_userspace(struct cpufreq_policy *policy,
+ unsigned int event)
+{
+ unsigned int cpu = policy->cpu;
+ switch (event) {
+ case CPUFREQ_GOV_START:
+ if (!cpu_online(cpu))
+ return -EINVAL;
+ BUG_ON(!policy->cur);
+ down(&userspace_sem);
+ cpu_is_managed[cpu] = 1;
+ cpu_min_freq[cpu] = policy->min;
+ cpu_max_freq[cpu] = policy->max;
+ cpu_cur_freq[cpu] = policy->cur;
+ cpu_set_freq[cpu] = policy->cur;
+ sysfs_create_file (&policy->kobj, &freq_attr_scaling_setspeed.attr);
+ memcpy (&current_policy[cpu], policy, sizeof(struct cpufreq_policy));
+ dprintk("managing cpu %u started (%u - %u kHz, currently %u kHz)\n", cpu, cpu_min_freq[cpu], cpu_max_freq[cpu], cpu_cur_freq[cpu]);
+ up(&userspace_sem);
+ break;
+ case CPUFREQ_GOV_STOP:
+ down(&userspace_sem);
+ cpu_is_managed[cpu] = 0;
+ cpu_min_freq[cpu] = 0;
+ cpu_max_freq[cpu] = 0;
+ cpu_set_freq[cpu] = 0;
+ sysfs_remove_file (&policy->kobj, &freq_attr_scaling_setspeed.attr);
+ dprintk("managing cpu %u stopped\n", cpu);
+ up(&userspace_sem);
+ break;
+ case CPUFREQ_GOV_LIMITS:
+ down(&userspace_sem);
+ cpu_min_freq[cpu] = policy->min;
+ cpu_max_freq[cpu] = policy->max;
+ dprintk("limit event for cpu %u: %u - %u kHz, currently %u kHz, last set to %u kHz\n", cpu, cpu_min_freq[cpu], cpu_max_freq[cpu], cpu_cur_freq[cpu], cpu_set_freq[cpu]);
+ if (policy->max < cpu_set_freq[cpu]) {
+ __cpufreq_driver_target(&current_policy[cpu], policy->max,
+ CPUFREQ_RELATION_H);
+ } else if (policy->min > cpu_set_freq[cpu]) {
+ __cpufreq_driver_target(&current_policy[cpu], policy->min,
+ CPUFREQ_RELATION_L);
+ } else {
+ __cpufreq_driver_target(&current_policy[cpu], cpu_set_freq[cpu],
+ CPUFREQ_RELATION_L);
+ }
+ memcpy (&current_policy[cpu], policy, sizeof(struct cpufreq_policy));
+ up(&userspace_sem);
+ break;
+ }
+ return 0;
+}
+
+
+struct cpufreq_governor cpufreq_gov_userspace = {
+ .name = "userspace",
+ .governor = cpufreq_governor_userspace,
+ .owner = THIS_MODULE,
+};
+EXPORT_SYMBOL(cpufreq_gov_userspace);
+
+static int __init cpufreq_gov_userspace_init(void)
+{
+ cpufreq_register_notifier(&userspace_cpufreq_notifier_block, CPUFREQ_TRANSITION_NOTIFIER);
+ return cpufreq_register_governor(&cpufreq_gov_userspace);
+}
+
+
+static void __exit cpufreq_gov_userspace_exit(void)
+{
+ cpufreq_unregister_governor(&cpufreq_gov_userspace);
+ cpufreq_unregister_notifier(&userspace_cpufreq_notifier_block, CPUFREQ_TRANSITION_NOTIFIER);
+}
+
+
+MODULE_AUTHOR ("Dominik Brodowski <linux@brodo.de>, Russell King <rmk@arm.linux.org.uk>");
+MODULE_DESCRIPTION ("CPUfreq policy governor 'userspace'");
+MODULE_LICENSE ("GPL");
+
+fs_initcall(cpufreq_gov_userspace_init);
+module_exit(cpufreq_gov_userspace_exit);
diff --git a/drivers/cpufreq/freq_table.c b/drivers/cpufreq/freq_table.c
new file mode 100644
index 000000000000..ba460bdea60f
--- /dev/null
+++ b/drivers/cpufreq/freq_table.c
@@ -0,0 +1,225 @@
+/*
+ * linux/drivers/cpufreq/freq_table.c
+ *
+ * Copyright (C) 2002 - 2003 Dominik Brodowski
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/cpufreq.h>
+
+#define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_CORE, "freq-table", msg)
+
+/*********************************************************************
+ * 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 = 0;
+
+ for (i=0; (table[i].frequency != CPUFREQ_TABLE_END); i++) {
+ unsigned int freq = table[i].frequency;
+ if (freq == CPUFREQ_ENTRY_INVALID) {
+ dprintk("table entry %u is invalid, skipping\n", i);
+
+ continue;
+ }
+ dprintk("table entry %u: %u kHz, %u index\n", i, freq, table[i].index);
+ 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;
+}
+EXPORT_SYMBOL_GPL(cpufreq_frequency_table_cpuinfo);
+
+
+int cpufreq_frequency_table_verify(struct cpufreq_policy *policy,
+ struct cpufreq_frequency_table *table)
+{
+ unsigned int next_larger = ~0;
+ unsigned int i = 0;
+ unsigned int count = 0;
+
+ dprintk("request for verification of policy (%u - %u kHz) for cpu %u\n", policy->min, policy->max, policy->cpu);
+
+ if (!cpu_online(policy->cpu))
+ return -EINVAL;
+
+ cpufreq_verify_within_limits(policy,
+ policy->cpuinfo.min_freq,
+ policy->cpuinfo.max_freq);
+
+ 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))
+ count++;
+ else if ((next_larger > freq) && (freq > policy->max))
+ next_larger = freq;
+ }
+
+ if (!count)
+ policy->max = next_larger;
+
+ cpufreq_verify_within_limits(policy,
+ policy->cpuinfo.min_freq,
+ policy->cpuinfo.max_freq);
+
+ dprintk("verification lead to (%u - %u kHz) for cpu %u\n", policy->min, policy->max, policy->cpu);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(cpufreq_frequency_table_verify);
+
+
+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, };
+ struct cpufreq_frequency_table suboptimal = { .index = ~0, };
+ unsigned int i;
+
+ dprintk("request for target %u kHz (relation: %u) for cpu %u\n", target_freq, relation, policy->cpu);
+
+ switch (relation) {
+ case CPUFREQ_RELATION_H:
+ optimal.frequency = 0;
+ suboptimal.frequency = ~0;
+ break;
+ case CPUFREQ_RELATION_L:
+ optimal.frequency = ~0;
+ suboptimal.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;
+
+ dprintk("target is %u (%u kHz, %u)\n", *index, table[*index].frequency,
+ table[*index].index);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(cpufreq_frequency_table_target);
+
+static struct cpufreq_frequency_table *show_table[NR_CPUS];
+/**
+ * show_scaling_governor - show the current policy for the specified CPU
+ */
+static ssize_t show_available_freqs (struct cpufreq_policy *policy, char *buf)
+{
+ unsigned int i = 0;
+ unsigned int cpu = policy->cpu;
+ ssize_t count = 0;
+ struct cpufreq_frequency_table *table;
+
+ if (!show_table[cpu])
+ return -ENODEV;
+
+ table = show_table[cpu];
+
+ for (i=0; (table[i].frequency != CPUFREQ_TABLE_END); i++) {
+ if (table[i].frequency == CPUFREQ_ENTRY_INVALID)
+ continue;
+ count += sprintf(&buf[count], "%d ", table[i].frequency);
+ }
+ count += sprintf(&buf[count], "\n");
+
+ return count;
+
+}
+
+struct freq_attr cpufreq_freq_attr_scaling_available_freqs = {
+ .attr = { .name = "scaling_available_frequencies", .mode = 0444, .owner=THIS_MODULE },
+ .show = show_available_freqs,
+};
+EXPORT_SYMBOL_GPL(cpufreq_freq_attr_scaling_available_freqs);
+
+/*
+ * if you use these, you must assure that the frequency table is valid
+ * all the time between get_attr and put_attr!
+ */
+void cpufreq_frequency_table_get_attr(struct cpufreq_frequency_table *table,
+ unsigned int cpu)
+{
+ dprintk("setting show_table for cpu %u to %p\n", cpu, table);
+ show_table[cpu] = table;
+}
+EXPORT_SYMBOL_GPL(cpufreq_frequency_table_get_attr);
+
+void cpufreq_frequency_table_put_attr(unsigned int cpu)
+{
+ dprintk("clearing show_table for cpu %u\n", cpu);
+ show_table[cpu] = NULL;
+}
+EXPORT_SYMBOL_GPL(cpufreq_frequency_table_put_attr);
+
+struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu)
+{
+ return show_table[cpu];
+}
+EXPORT_SYMBOL_GPL(cpufreq_frequency_get_table);
+
+MODULE_AUTHOR ("Dominik Brodowski <linux@brodo.de>");
+MODULE_DESCRIPTION ("CPUfreq frequency table helpers");
+MODULE_LICENSE ("GPL");