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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;
static DEFINE_IDA(intel_uncore_ida);
/* callbacks for actual HW read/write */
static int (*uncore_read)(struct uncore_data *data, unsigned int *value, enum uncore_index index);
static int (*uncore_write)(struct uncore_data *data, unsigned int input, enum uncore_index index);
static ssize_t show_domain_id(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
{
struct uncore_data *data = container_of(attr, struct uncore_data, domain_id_kobj_attr);
return sprintf(buf, "%u\n", data->domain_id);
}
static ssize_t show_fabric_cluster_id(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
{
struct uncore_data *data = container_of(attr, struct uncore_data, fabric_cluster_id_kobj_attr);
return sprintf(buf, "%u\n", data->cluster_id);
}
static ssize_t show_package_id(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
{
struct uncore_data *data = container_of(attr, struct uncore_data, package_id_kobj_attr);
return sprintf(buf, "%u\n", data->package_id);
}
static ssize_t show_attr(struct uncore_data *data, char *buf, enum uncore_index index)
{
unsigned int value;
int ret;
mutex_lock(&uncore_lock);
ret = uncore_read(data, &value, index);
mutex_unlock(&uncore_lock);
if (ret)
return ret;
return sprintf(buf, "%u\n", value);
}
static ssize_t store_attr(struct uncore_data *data, const char *buf, ssize_t count,
enum uncore_index index)
{
unsigned int input = 0;
int ret;
if (index == UNCORE_INDEX_EFF_LAT_CTRL_HIGH_THRESHOLD_ENABLE) {
if (kstrtobool(buf, (bool *)&input))
return -EINVAL;
} else {
if (kstrtouint(buf, 10, &input))
return -EINVAL;
}
mutex_lock(&uncore_lock);
ret = uncore_write(data, input, index);
mutex_unlock(&uncore_lock);
if (ret)
return ret;
return count;
}
#define store_uncore_attr(name, index) \
static ssize_t store_##name(struct kobject *kobj, \
struct kobj_attribute *attr, \
const char *buf, size_t count) \
{ \
struct uncore_data *data = container_of(attr, struct uncore_data, name##_kobj_attr);\
\
return store_attr(data, buf, count, index); \
}
#define show_uncore_attr(name, index) \
static ssize_t show_##name(struct kobject *kobj, \
struct kobj_attribute *attr, char *buf)\
{ \
struct uncore_data *data = container_of(attr, struct uncore_data, name##_kobj_attr);\
\
return show_attr(data, buf, index); \
}
store_uncore_attr(min_freq_khz, UNCORE_INDEX_MIN_FREQ);
store_uncore_attr(max_freq_khz, UNCORE_INDEX_MAX_FREQ);
show_uncore_attr(min_freq_khz, UNCORE_INDEX_MIN_FREQ);
show_uncore_attr(max_freq_khz, UNCORE_INDEX_MAX_FREQ);
show_uncore_attr(current_freq_khz, UNCORE_INDEX_CURRENT_FREQ);
store_uncore_attr(elc_low_threshold_percent, UNCORE_INDEX_EFF_LAT_CTRL_LOW_THRESHOLD);
store_uncore_attr(elc_high_threshold_percent, UNCORE_INDEX_EFF_LAT_CTRL_HIGH_THRESHOLD);
store_uncore_attr(elc_high_threshold_enable,
UNCORE_INDEX_EFF_LAT_CTRL_HIGH_THRESHOLD_ENABLE);
store_uncore_attr(elc_floor_freq_khz, UNCORE_INDEX_EFF_LAT_CTRL_FREQ);
show_uncore_attr(elc_low_threshold_percent, UNCORE_INDEX_EFF_LAT_CTRL_LOW_THRESHOLD);
show_uncore_attr(elc_high_threshold_percent, UNCORE_INDEX_EFF_LAT_CTRL_HIGH_THRESHOLD);
show_uncore_attr(elc_high_threshold_enable,
UNCORE_INDEX_EFF_LAT_CTRL_HIGH_THRESHOLD_ENABLE);
show_uncore_attr(elc_floor_freq_khz, UNCORE_INDEX_EFF_LAT_CTRL_FREQ);
#define show_uncore_data(member_name) \
static ssize_t show_##member_name(struct kobject *kobj, \
struct kobj_attribute *attr, char *buf)\
{ \
struct uncore_data *data = container_of(attr, struct uncore_data,\
member_name##_kobj_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##_kobj_attr.attr); \
data->_name##_kobj_attr.show = show_##_name; \
data->_name##_kobj_attr.store = store_##_name; \
data->_name##_kobj_attr.attr.name = #_name; \
data->_name##_kobj_attr.attr.mode = 0644; \
} while (0)
#define init_attribute_ro(_name) \
do { \
sysfs_attr_init(&data->_name##_kobj_attr.attr); \
data->_name##_kobj_attr.show = show_##_name; \
data->_name##_kobj_attr.store = NULL; \
data->_name##_kobj_attr.attr.name = #_name; \
data->_name##_kobj_attr.attr.mode = 0444; \
} while (0)
#define init_attribute_root_ro(_name) \
do { \
sysfs_attr_init(&data->_name##_kobj_attr.attr); \
data->_name##_kobj_attr.show = show_##_name; \
data->_name##_kobj_attr.store = NULL; \
data->_name##_kobj_attr.attr.name = #_name; \
data->_name##_kobj_attr.attr.mode = 0400; \
} while (0)
static int create_attr_group(struct uncore_data *data, char *name)
{
int ret, index = 0;
unsigned int val;
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);
if (data->domain_id != UNCORE_DOMAIN_ID_INVALID) {
init_attribute_root_ro(domain_id);
data->uncore_attrs[index++] = &data->domain_id_kobj_attr.attr;
init_attribute_root_ro(fabric_cluster_id);
data->uncore_attrs[index++] = &data->fabric_cluster_id_kobj_attr.attr;
init_attribute_root_ro(package_id);
data->uncore_attrs[index++] = &data->package_id_kobj_attr.attr;
}
data->uncore_attrs[index++] = &data->max_freq_khz_kobj_attr.attr;
data->uncore_attrs[index++] = &data->min_freq_khz_kobj_attr.attr;
data->uncore_attrs[index++] = &data->initial_min_freq_khz_kobj_attr.attr;
data->uncore_attrs[index++] = &data->initial_max_freq_khz_kobj_attr.attr;
ret = uncore_read(data, &val, UNCORE_INDEX_CURRENT_FREQ);
if (!ret)
data->uncore_attrs[index++] = &data->current_freq_khz_kobj_attr.attr;
ret = uncore_read(data, &val, UNCORE_INDEX_EFF_LAT_CTRL_LOW_THRESHOLD);
if (!ret) {
init_attribute_rw(elc_low_threshold_percent);
init_attribute_rw(elc_high_threshold_percent);
init_attribute_rw(elc_high_threshold_enable);
init_attribute_rw(elc_floor_freq_khz);
data->uncore_attrs[index++] = &data->elc_low_threshold_percent_kobj_attr.attr;
data->uncore_attrs[index++] = &data->elc_high_threshold_percent_kobj_attr.attr;
data->uncore_attrs[index++] =
&data->elc_high_threshold_enable_kobj_attr.attr;
data->uncore_attrs[index++] = &data->elc_floor_freq_khz_kobj_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;
}
if (data->domain_id != UNCORE_DOMAIN_ID_INVALID) {
ret = ida_alloc(&intel_uncore_ida, GFP_KERNEL);
if (ret < 0)
goto uncore_unlock;
data->instance_id = ret;
sprintf(data->name, "uncore%02d", ret);
} else {
sprintf(data->name, "package_%02d_die_%02d", data->package_id, data->die_id);
}
uncore_read(data, &data->initial_min_freq_khz, UNCORE_INDEX_MIN_FREQ);
uncore_read(data, &data->initial_max_freq_khz, UNCORE_INDEX_MAX_FREQ);
ret = create_attr_group(data, data->name);
if (ret) {
if (data->domain_id != UNCORE_DOMAIN_ID_INVALID)
ida_free(&intel_uncore_ida, data->instance_id);
} else {
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;
if (data->domain_id != UNCORE_DOMAIN_ID_INVALID)
ida_free(&intel_uncore_ida, data->instance_id);
mutex_unlock(&uncore_lock);
}
EXPORT_SYMBOL_NS_GPL(uncore_freq_remove_die_entry, "INTEL_UNCORE_FREQUENCY");
int uncore_freq_common_init(int (*read)(struct uncore_data *data, unsigned int *value,
enum uncore_index index),
int (*write)(struct uncore_data *data, unsigned int input,
enum uncore_index index))
{
mutex_lock(&uncore_lock);
uncore_read = read;
uncore_write = write;
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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