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// SPDX-License-Identifier: GPL-2.0
/*
* Intel Uncore Frequency Control: Common code implementation
* Copyright (c) 2022, Intel Corporation.
* All rights reserved.
*
*/
#include <linux/cpu.h>
#include <linux/module.h>
#include "uncore-frequency-common.h"
/* Mutex to control all mutual exclusions */
static DEFINE_MUTEX(uncore_lock);
/* Root of the all uncore sysfs kobjs */
static struct kobject *uncore_root_kobj;
/* uncore instance count */
static int uncore_instance_count;
/* callbacks for actual HW read/write */
static int (*uncore_read)(struct uncore_data *data, unsigned int *min, unsigned int *max);
static int (*uncore_write)(struct uncore_data *data, unsigned int input, unsigned int min_max);
static int (*uncore_read_freq)(struct uncore_data *data, unsigned int *freq);
static ssize_t show_min_max_freq_khz(struct uncore_data *data,
char *buf, int min_max)
{
unsigned int min, max;
int ret;
mutex_lock(&uncore_lock);
ret = uncore_read(data, &min, &max);
mutex_unlock(&uncore_lock);
if (ret)
return ret;
if (min_max)
return sprintf(buf, "%u\n", max);
return sprintf(buf, "%u\n", min);
}
static ssize_t store_min_max_freq_khz(struct uncore_data *data,
const char *buf, ssize_t count,
int min_max)
{
unsigned int input;
int ret;
if (kstrtouint(buf, 10, &input))
return -EINVAL;
mutex_lock(&uncore_lock);
ret = uncore_write(data, input, min_max);
mutex_unlock(&uncore_lock);
if (ret)
return ret;
return count;
}
static ssize_t show_perf_status_freq_khz(struct uncore_data *data, char *buf)
{
unsigned int freq;
int ret;
mutex_lock(&uncore_lock);
ret = uncore_read_freq(data, &freq);
mutex_unlock(&uncore_lock);
if (ret)
return ret;
return sprintf(buf, "%u\n", freq);
}
#define store_uncore_min_max(name, min_max) \
static ssize_t store_##name(struct device *dev, \
struct device_attribute *attr, \
const char *buf, size_t count) \
{ \
struct uncore_data *data = container_of(attr, struct uncore_data, name##_dev_attr);\
\
return store_min_max_freq_khz(data, buf, count, \
min_max); \
}
#define show_uncore_min_max(name, min_max) \
static ssize_t show_##name(struct device *dev, \
struct device_attribute *attr, char *buf)\
{ \
struct uncore_data *data = container_of(attr, struct uncore_data, name##_dev_attr);\
\
return show_min_max_freq_khz(data, buf, min_max); \
}
#define show_uncore_perf_status(name) \
static ssize_t show_##name(struct device *dev, \
struct device_attribute *attr, char *buf)\
{ \
struct uncore_data *data = container_of(attr, struct uncore_data, name##_dev_attr);\
\
return show_perf_status_freq_khz(data, buf); \
}
store_uncore_min_max(min_freq_khz, 0);
store_uncore_min_max(max_freq_khz, 1);
show_uncore_min_max(min_freq_khz, 0);
show_uncore_min_max(max_freq_khz, 1);
show_uncore_perf_status(current_freq_khz);
#define show_uncore_data(member_name) \
static ssize_t show_##member_name(struct device *dev, \
struct device_attribute *attr, char *buf)\
{ \
struct uncore_data *data = container_of(attr, struct uncore_data,\
member_name##_dev_attr);\
\
return sysfs_emit(buf, "%u\n", \
data->member_name); \
} \
show_uncore_data(initial_min_freq_khz);
show_uncore_data(initial_max_freq_khz);
#define init_attribute_rw(_name) \
do { \
sysfs_attr_init(&data->_name##_dev_attr.attr); \
data->_name##_dev_attr.show = show_##_name; \
data->_name##_dev_attr.store = store_##_name; \
data->_name##_dev_attr.attr.name = #_name; \
data->_name##_dev_attr.attr.mode = 0644; \
} while (0)
#define init_attribute_ro(_name) \
do { \
sysfs_attr_init(&data->_name##_dev_attr.attr); \
data->_name##_dev_attr.show = show_##_name; \
data->_name##_dev_attr.store = NULL; \
data->_name##_dev_attr.attr.name = #_name; \
data->_name##_dev_attr.attr.mode = 0444; \
} while (0)
#define init_attribute_root_ro(_name) \
do { \
sysfs_attr_init(&data->_name##_dev_attr.attr); \
data->_name##_dev_attr.show = show_##_name; \
data->_name##_dev_attr.store = NULL; \
data->_name##_dev_attr.attr.name = #_name; \
data->_name##_dev_attr.attr.mode = 0400; \
} while (0)
static int create_attr_group(struct uncore_data *data, char *name)
{
int ret, index = 0;
init_attribute_rw(max_freq_khz);
init_attribute_rw(min_freq_khz);
init_attribute_ro(initial_min_freq_khz);
init_attribute_ro(initial_max_freq_khz);
init_attribute_root_ro(current_freq_khz);
data->uncore_attrs[index++] = &data->max_freq_khz_dev_attr.attr;
data->uncore_attrs[index++] = &data->min_freq_khz_dev_attr.attr;
data->uncore_attrs[index++] = &data->initial_min_freq_khz_dev_attr.attr;
data->uncore_attrs[index++] = &data->initial_max_freq_khz_dev_attr.attr;
data->uncore_attrs[index++] = &data->current_freq_khz_dev_attr.attr;
data->uncore_attrs[index] = NULL;
data->uncore_attr_group.name = name;
data->uncore_attr_group.attrs = data->uncore_attrs;
ret = sysfs_create_group(uncore_root_kobj, &data->uncore_attr_group);
return ret;
}
static void delete_attr_group(struct uncore_data *data, char *name)
{
sysfs_remove_group(uncore_root_kobj, &data->uncore_attr_group);
}
int uncore_freq_add_entry(struct uncore_data *data, int cpu)
{
int ret = 0;
mutex_lock(&uncore_lock);
if (data->valid) {
/* control cpu changed */
data->control_cpu = cpu;
goto uncore_unlock;
}
sprintf(data->name, "package_%02d_die_%02d", data->package_id, data->die_id);
uncore_read(data, &data->initial_min_freq_khz, &data->initial_max_freq_khz);
ret = create_attr_group(data, data->name);
if (!ret) {
data->control_cpu = cpu;
data->valid = true;
}
uncore_unlock:
mutex_unlock(&uncore_lock);
return ret;
}
EXPORT_SYMBOL_NS_GPL(uncore_freq_add_entry, INTEL_UNCORE_FREQUENCY);
void uncore_freq_remove_die_entry(struct uncore_data *data)
{
mutex_lock(&uncore_lock);
delete_attr_group(data, data->name);
data->control_cpu = -1;
data->valid = false;
mutex_unlock(&uncore_lock);
}
EXPORT_SYMBOL_NS_GPL(uncore_freq_remove_die_entry, INTEL_UNCORE_FREQUENCY);
int uncore_freq_common_init(int (*read_control_freq)(struct uncore_data *data, unsigned int *min, unsigned int *max),
int (*write_control_freq)(struct uncore_data *data, unsigned int input, unsigned int set_max),
int (*read_freq)(struct uncore_data *data, unsigned int *freq))
{
mutex_lock(&uncore_lock);
uncore_read = read_control_freq;
uncore_write = write_control_freq;
uncore_read_freq = read_freq;
if (!uncore_root_kobj) {
struct device *dev_root = bus_get_dev_root(&cpu_subsys);
if (dev_root) {
uncore_root_kobj = kobject_create_and_add("intel_uncore_frequency",
&dev_root->kobj);
put_device(dev_root);
}
}
if (uncore_root_kobj)
++uncore_instance_count;
mutex_unlock(&uncore_lock);
return uncore_root_kobj ? 0 : -ENOMEM;
}
EXPORT_SYMBOL_NS_GPL(uncore_freq_common_init, INTEL_UNCORE_FREQUENCY);
void uncore_freq_common_exit(void)
{
mutex_lock(&uncore_lock);
--uncore_instance_count;
if (!uncore_instance_count) {
kobject_put(uncore_root_kobj);
uncore_root_kobj = NULL;
}
mutex_unlock(&uncore_lock);
}
EXPORT_SYMBOL_NS_GPL(uncore_freq_common_exit, INTEL_UNCORE_FREQUENCY);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Intel Uncore Frequency Common Module");
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