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PowerCap: Add class driver
The power capping framework providing a consistent interface between the kernel and user space that allows power capping drivers to expose their settings to user space in a uniform way. The overall design of the framework is described in the documentation added by the previous patch in this series. Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com> Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Srinivas Pandruvada
Rafael J. Wysocki
parent
e23feb1668
commit
75d2364ea0
4 changed files with 1028 additions and 0 deletions
19
drivers/powercap/Kconfig
Normal file
19
drivers/powercap/Kconfig
Normal file
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@ -0,0 +1,19 @@
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#
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# Generic power capping sysfs interface configuration
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#
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menuconfig POWERCAP
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bool "Generic powercap sysfs driver"
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help
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The power capping sysfs interface allows kernel subsystems to expose power
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capping settings to user space in a consistent way. Usually, it consists
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of multiple control types that determine which settings may be exposed and
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power zones representing parts of the system that can be subject to power
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capping.
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If you want this code to be compiled in, say Y here.
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if POWERCAP
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# Client driver configurations go here.
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endif
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1
drivers/powercap/Makefile
Normal file
1
drivers/powercap/Makefile
Normal file
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@ -0,0 +1 @@
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obj-$(CONFIG_POWERCAP) += powercap_sys.o
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683
drivers/powercap/powercap_sys.c
Normal file
683
drivers/powercap/powercap_sys.c
Normal file
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@ -0,0 +1,683 @@
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/*
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* Power capping class
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* Copyright (c) 2013, Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc.
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*
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*/
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/slab.h>
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#include <linux/powercap.h>
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#define to_powercap_zone(n) container_of(n, struct powercap_zone, dev)
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#define to_powercap_control_type(n) \
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container_of(n, struct powercap_control_type, dev)
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/* Power zone show function */
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#define define_power_zone_show(_attr) \
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static ssize_t _attr##_show(struct device *dev, \
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struct device_attribute *dev_attr,\
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char *buf) \
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{ \
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u64 value; \
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ssize_t len = -EINVAL; \
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struct powercap_zone *power_zone = to_powercap_zone(dev); \
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\
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if (power_zone->ops->get_##_attr) { \
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if (!power_zone->ops->get_##_attr(power_zone, &value)) \
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len = sprintf(buf, "%lld\n", value); \
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} \
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\
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return len; \
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}
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/* The only meaningful input is 0 (reset), others are silently ignored */
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#define define_power_zone_store(_attr) \
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static ssize_t _attr##_store(struct device *dev,\
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struct device_attribute *dev_attr, \
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const char *buf, size_t count) \
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{ \
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int err; \
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struct powercap_zone *power_zone = to_powercap_zone(dev); \
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u64 value; \
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\
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err = kstrtoull(buf, 10, &value); \
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if (err) \
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return -EINVAL; \
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if (value) \
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return count; \
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if (power_zone->ops->reset_##_attr) { \
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if (!power_zone->ops->reset_##_attr(power_zone)) \
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return count; \
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} \
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\
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return -EINVAL; \
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}
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/* Power zone constraint show function */
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#define define_power_zone_constraint_show(_attr) \
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static ssize_t show_constraint_##_attr(struct device *dev, \
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struct device_attribute *dev_attr,\
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char *buf) \
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{ \
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u64 value; \
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ssize_t len = -ENODATA; \
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struct powercap_zone *power_zone = to_powercap_zone(dev); \
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int id; \
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struct powercap_zone_constraint *pconst;\
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\
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if (!sscanf(dev_attr->attr.name, "constraint_%d_", &id)) \
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return -EINVAL; \
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if (id >= power_zone->const_id_cnt) \
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return -EINVAL; \
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pconst = &power_zone->constraints[id]; \
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if (pconst && pconst->ops && pconst->ops->get_##_attr) { \
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if (!pconst->ops->get_##_attr(power_zone, id, &value)) \
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len = sprintf(buf, "%lld\n", value); \
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} \
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\
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return len; \
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}
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/* Power zone constraint store function */
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#define define_power_zone_constraint_store(_attr) \
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static ssize_t store_constraint_##_attr(struct device *dev,\
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struct device_attribute *dev_attr, \
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const char *buf, size_t count) \
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{ \
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int err; \
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u64 value; \
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struct powercap_zone *power_zone = to_powercap_zone(dev); \
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int id; \
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struct powercap_zone_constraint *pconst;\
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\
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if (!sscanf(dev_attr->attr.name, "constraint_%d_", &id)) \
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return -EINVAL; \
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if (id >= power_zone->const_id_cnt) \
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return -EINVAL; \
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pconst = &power_zone->constraints[id]; \
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err = kstrtoull(buf, 10, &value); \
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if (err) \
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return -EINVAL; \
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if (pconst && pconst->ops && pconst->ops->set_##_attr) { \
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if (!pconst->ops->set_##_attr(power_zone, id, value)) \
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return count; \
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} \
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\
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return -ENODATA; \
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}
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/* Power zone information callbacks */
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define_power_zone_show(power_uw);
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define_power_zone_show(max_power_range_uw);
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define_power_zone_show(energy_uj);
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define_power_zone_store(energy_uj);
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define_power_zone_show(max_energy_range_uj);
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/* Power zone attributes */
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static DEVICE_ATTR_RO(max_power_range_uw);
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static DEVICE_ATTR_RO(power_uw);
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static DEVICE_ATTR_RO(max_energy_range_uj);
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static DEVICE_ATTR_RW(energy_uj);
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/* Power zone constraint attributes callbacks */
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define_power_zone_constraint_show(power_limit_uw);
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define_power_zone_constraint_store(power_limit_uw);
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define_power_zone_constraint_show(time_window_us);
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define_power_zone_constraint_store(time_window_us);
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define_power_zone_constraint_show(max_power_uw);
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define_power_zone_constraint_show(min_power_uw);
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define_power_zone_constraint_show(max_time_window_us);
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define_power_zone_constraint_show(min_time_window_us);
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/* For one time seeding of constraint device attributes */
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struct powercap_constraint_attr {
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struct device_attribute power_limit_attr;
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struct device_attribute time_window_attr;
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struct device_attribute max_power_attr;
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struct device_attribute min_power_attr;
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struct device_attribute max_time_window_attr;
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struct device_attribute min_time_window_attr;
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struct device_attribute name_attr;
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};
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static struct powercap_constraint_attr
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constraint_attrs[MAX_CONSTRAINTS_PER_ZONE];
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/* A list of powercap control_types */
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static LIST_HEAD(powercap_cntrl_list);
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/* Mutex to protect list of powercap control_types */
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static DEFINE_MUTEX(powercap_cntrl_list_lock);
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#define POWERCAP_CONSTRAINT_NAME_LEN 30 /* Some limit to avoid overflow */
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static ssize_t show_constraint_name(struct device *dev,
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struct device_attribute *dev_attr,
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char *buf)
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{
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const char *name;
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struct powercap_zone *power_zone = to_powercap_zone(dev);
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int id;
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ssize_t len = -ENODATA;
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struct powercap_zone_constraint *pconst;
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if (!sscanf(dev_attr->attr.name, "constraint_%d_", &id))
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return -EINVAL;
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if (id >= power_zone->const_id_cnt)
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return -EINVAL;
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pconst = &power_zone->constraints[id];
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if (pconst && pconst->ops && pconst->ops->get_name) {
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name = pconst->ops->get_name(power_zone, id);
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if (name) {
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snprintf(buf, POWERCAP_CONSTRAINT_NAME_LEN,
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"%s\n", name);
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buf[POWERCAP_CONSTRAINT_NAME_LEN] = '\0';
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len = strlen(buf);
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}
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}
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return len;
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}
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static int create_constraint_attribute(int id, const char *name,
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int mode,
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struct device_attribute *dev_attr,
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ssize_t (*show)(struct device *,
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struct device_attribute *, char *),
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ssize_t (*store)(struct device *,
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struct device_attribute *,
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const char *, size_t)
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)
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{
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dev_attr->attr.name = kasprintf(GFP_KERNEL, "constraint_%d_%s",
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id, name);
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if (!dev_attr->attr.name)
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return -ENOMEM;
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dev_attr->attr.mode = mode;
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dev_attr->show = show;
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dev_attr->store = store;
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return 0;
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}
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static void free_constraint_attributes(void)
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{
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int i;
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for (i = 0; i < MAX_CONSTRAINTS_PER_ZONE; ++i) {
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kfree(constraint_attrs[i].power_limit_attr.attr.name);
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kfree(constraint_attrs[i].time_window_attr.attr.name);
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kfree(constraint_attrs[i].name_attr.attr.name);
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kfree(constraint_attrs[i].max_power_attr.attr.name);
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kfree(constraint_attrs[i].min_power_attr.attr.name);
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kfree(constraint_attrs[i].max_time_window_attr.attr.name);
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kfree(constraint_attrs[i].min_time_window_attr.attr.name);
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}
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}
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static int seed_constraint_attributes(void)
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{
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int i;
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int ret;
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for (i = 0; i < MAX_CONSTRAINTS_PER_ZONE; ++i) {
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ret = create_constraint_attribute(i, "power_limit_uw",
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S_IWUSR | S_IRUGO,
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&constraint_attrs[i].power_limit_attr,
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show_constraint_power_limit_uw,
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store_constraint_power_limit_uw);
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|
if (ret)
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goto err_alloc;
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ret = create_constraint_attribute(i, "time_window_us",
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S_IWUSR | S_IRUGO,
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&constraint_attrs[i].time_window_attr,
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show_constraint_time_window_us,
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store_constraint_time_window_us);
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if (ret)
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goto err_alloc;
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ret = create_constraint_attribute(i, "name", S_IRUGO,
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&constraint_attrs[i].name_attr,
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show_constraint_name,
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NULL);
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if (ret)
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goto err_alloc;
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ret = create_constraint_attribute(i, "max_power_uw", S_IRUGO,
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&constraint_attrs[i].max_power_attr,
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show_constraint_max_power_uw,
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NULL);
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if (ret)
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goto err_alloc;
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ret = create_constraint_attribute(i, "min_power_uw", S_IRUGO,
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&constraint_attrs[i].min_power_attr,
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show_constraint_min_power_uw,
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|
NULL);
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if (ret)
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goto err_alloc;
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ret = create_constraint_attribute(i, "max_time_window_us",
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S_IRUGO,
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&constraint_attrs[i].max_time_window_attr,
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show_constraint_max_time_window_us,
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|
NULL);
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|
if (ret)
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goto err_alloc;
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ret = create_constraint_attribute(i, "min_time_window_us",
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S_IRUGO,
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&constraint_attrs[i].min_time_window_attr,
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show_constraint_min_time_window_us,
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|
NULL);
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|
if (ret)
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goto err_alloc;
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|
|
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}
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|
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return 0;
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|
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err_alloc:
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free_constraint_attributes();
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|
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return ret;
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|
}
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|
|
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static int create_constraints(struct powercap_zone *power_zone,
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|
int nr_constraints,
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|
struct powercap_zone_constraint_ops *const_ops)
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|
{
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|
int i;
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|
int ret = 0;
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int count;
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struct powercap_zone_constraint *pconst;
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|
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|
if (!power_zone || !const_ops || !const_ops->get_power_limit_uw ||
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!const_ops->set_power_limit_uw ||
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!const_ops->get_time_window_us ||
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!const_ops->set_time_window_us)
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|
return -EINVAL;
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|
|
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|
count = power_zone->zone_attr_count;
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|
for (i = 0; i < nr_constraints; ++i) {
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|
pconst = &power_zone->constraints[i];
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|
pconst->ops = const_ops;
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|
pconst->id = power_zone->const_id_cnt;
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power_zone->const_id_cnt++;
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|
power_zone->zone_dev_attrs[count++] =
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&constraint_attrs[i].power_limit_attr.attr;
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|
power_zone->zone_dev_attrs[count++] =
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&constraint_attrs[i].time_window_attr.attr;
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|
if (pconst->ops->get_name)
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|
power_zone->zone_dev_attrs[count++] =
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|
&constraint_attrs[i].name_attr.attr;
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|
if (pconst->ops->get_max_power_uw)
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|
power_zone->zone_dev_attrs[count++] =
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|
&constraint_attrs[i].max_power_attr.attr;
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|
if (pconst->ops->get_min_power_uw)
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|
power_zone->zone_dev_attrs[count++] =
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&constraint_attrs[i].min_power_attr.attr;
|
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|
if (pconst->ops->get_max_time_window_us)
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|
power_zone->zone_dev_attrs[count++] =
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&constraint_attrs[i].max_time_window_attr.attr;
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|
if (pconst->ops->get_min_time_window_us)
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power_zone->zone_dev_attrs[count++] =
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&constraint_attrs[i].min_time_window_attr.attr;
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}
|
||||||
|
power_zone->zone_attr_count = count;
|
||||||
|
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
|
||||||
|
static bool control_type_valid(void *control_type)
|
||||||
|
{
|
||||||
|
struct powercap_control_type *pos = NULL;
|
||||||
|
bool found = false;
|
||||||
|
|
||||||
|
mutex_lock(&powercap_cntrl_list_lock);
|
||||||
|
|
||||||
|
list_for_each_entry(pos, &powercap_cntrl_list, node) {
|
||||||
|
if (pos == control_type) {
|
||||||
|
found = true;
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
mutex_unlock(&powercap_cntrl_list_lock);
|
||||||
|
|
||||||
|
return found;
|
||||||
|
}
|
||||||
|
|
||||||
|
static ssize_t name_show(struct device *dev,
|
||||||
|
struct device_attribute *attr,
|
||||||
|
char *buf)
|
||||||
|
{
|
||||||
|
struct powercap_zone *power_zone = to_powercap_zone(dev);
|
||||||
|
|
||||||
|
return sprintf(buf, "%s\n", power_zone->name);
|
||||||
|
}
|
||||||
|
|
||||||
|
static DEVICE_ATTR_RO(name);
|
||||||
|
|
||||||
|
/* Create zone and attributes in sysfs */
|
||||||
|
static void create_power_zone_common_attributes(
|
||||||
|
struct powercap_zone *power_zone)
|
||||||
|
{
|
||||||
|
int count = 0;
|
||||||
|
|
||||||
|
power_zone->zone_dev_attrs[count++] = &dev_attr_name.attr;
|
||||||
|
if (power_zone->ops->get_max_energy_range_uj)
|
||||||
|
power_zone->zone_dev_attrs[count++] =
|
||||||
|
&dev_attr_max_energy_range_uj.attr;
|
||||||
|
if (power_zone->ops->get_energy_uj)
|
||||||
|
power_zone->zone_dev_attrs[count++] =
|
||||||
|
&dev_attr_energy_uj.attr;
|
||||||
|
if (power_zone->ops->get_power_uw)
|
||||||
|
power_zone->zone_dev_attrs[count++] =
|
||||||
|
&dev_attr_power_uw.attr;
|
||||||
|
if (power_zone->ops->get_max_power_range_uw)
|
||||||
|
power_zone->zone_dev_attrs[count++] =
|
||||||
|
&dev_attr_max_power_range_uw.attr;
|
||||||
|
power_zone->zone_dev_attrs[count] = NULL;
|
||||||
|
power_zone->zone_attr_count = count;
|
||||||
|
}
|
||||||
|
|
||||||
|
static void powercap_release(struct device *dev)
|
||||||
|
{
|
||||||
|
bool allocated;
|
||||||
|
|
||||||
|
if (dev->parent) {
|
||||||
|
struct powercap_zone *power_zone = to_powercap_zone(dev);
|
||||||
|
|
||||||
|
/* Store flag as the release() may free memory */
|
||||||
|
allocated = power_zone->allocated;
|
||||||
|
/* Remove id from parent idr struct */
|
||||||
|
idr_remove(power_zone->parent_idr, power_zone->id);
|
||||||
|
/* Destroy idrs allocated for this zone */
|
||||||
|
idr_destroy(&power_zone->idr);
|
||||||
|
kfree(power_zone->name);
|
||||||
|
kfree(power_zone->zone_dev_attrs);
|
||||||
|
kfree(power_zone->constraints);
|
||||||
|
if (power_zone->ops->release)
|
||||||
|
power_zone->ops->release(power_zone);
|
||||||
|
if (allocated)
|
||||||
|
kfree(power_zone);
|
||||||
|
} else {
|
||||||
|
struct powercap_control_type *control_type =
|
||||||
|
to_powercap_control_type(dev);
|
||||||
|
|
||||||
|
/* Store flag as the release() may free memory */
|
||||||
|
allocated = control_type->allocated;
|
||||||
|
idr_destroy(&control_type->idr);
|
||||||
|
mutex_destroy(&control_type->lock);
|
||||||
|
if (control_type->ops && control_type->ops->release)
|
||||||
|
control_type->ops->release(control_type);
|
||||||
|
if (allocated)
|
||||||
|
kfree(control_type);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
static ssize_t enabled_show(struct device *dev,
|
||||||
|
struct device_attribute *attr,
|
||||||
|
char *buf)
|
||||||
|
{
|
||||||
|
bool mode = true;
|
||||||
|
|
||||||
|
/* Default is enabled */
|
||||||
|
if (dev->parent) {
|
||||||
|
struct powercap_zone *power_zone = to_powercap_zone(dev);
|
||||||
|
if (power_zone->ops->get_enable)
|
||||||
|
if (power_zone->ops->get_enable(power_zone, &mode))
|
||||||
|
mode = false;
|
||||||
|
} else {
|
||||||
|
struct powercap_control_type *control_type =
|
||||||
|
to_powercap_control_type(dev);
|
||||||
|
if (control_type->ops && control_type->ops->get_enable)
|
||||||
|
if (control_type->ops->get_enable(control_type, &mode))
|
||||||
|
mode = false;
|
||||||
|
}
|
||||||
|
|
||||||
|
return sprintf(buf, "%d\n", mode);
|
||||||
|
}
|
||||||
|
|
||||||
|
static ssize_t enabled_store(struct device *dev,
|
||||||
|
struct device_attribute *attr,
|
||||||
|
const char *buf, size_t len)
|
||||||
|
{
|
||||||
|
bool mode;
|
||||||
|
|
||||||
|
if (strtobool(buf, &mode))
|
||||||
|
return -EINVAL;
|
||||||
|
if (dev->parent) {
|
||||||
|
struct powercap_zone *power_zone = to_powercap_zone(dev);
|
||||||
|
if (power_zone->ops->set_enable)
|
||||||
|
if (!power_zone->ops->set_enable(power_zone, mode))
|
||||||
|
return len;
|
||||||
|
} else {
|
||||||
|
struct powercap_control_type *control_type =
|
||||||
|
to_powercap_control_type(dev);
|
||||||
|
if (control_type->ops && control_type->ops->set_enable)
|
||||||
|
if (!control_type->ops->set_enable(control_type, mode))
|
||||||
|
return len;
|
||||||
|
}
|
||||||
|
|
||||||
|
return -ENOSYS;
|
||||||
|
}
|
||||||
|
|
||||||
|
static struct device_attribute powercap_def_attrs[] = {
|
||||||
|
__ATTR(enabled, S_IWUSR | S_IRUGO, enabled_show,
|
||||||
|
enabled_store),
|
||||||
|
__ATTR_NULL
|
||||||
|
};
|
||||||
|
|
||||||
|
static struct class powercap_class = {
|
||||||
|
.name = "powercap",
|
||||||
|
.dev_release = powercap_release,
|
||||||
|
.dev_attrs = powercap_def_attrs,
|
||||||
|
};
|
||||||
|
|
||||||
|
struct powercap_zone *powercap_register_zone(
|
||||||
|
struct powercap_zone *power_zone,
|
||||||
|
struct powercap_control_type *control_type,
|
||||||
|
const char *name,
|
||||||
|
struct powercap_zone *parent,
|
||||||
|
const struct powercap_zone_ops *ops,
|
||||||
|
int nr_constraints,
|
||||||
|
struct powercap_zone_constraint_ops *const_ops)
|
||||||
|
{
|
||||||
|
int result;
|
||||||
|
int nr_attrs;
|
||||||
|
|
||||||
|
if (!name || !control_type || !ops ||
|
||||||
|
nr_constraints > MAX_CONSTRAINTS_PER_ZONE ||
|
||||||
|
(!ops->get_energy_uj && !ops->get_power_uw) ||
|
||||||
|
!control_type_valid(control_type))
|
||||||
|
return ERR_PTR(-EINVAL);
|
||||||
|
|
||||||
|
if (power_zone) {
|
||||||
|
if (!ops->release)
|
||||||
|
return ERR_PTR(-EINVAL);
|
||||||
|
memset(power_zone, 0, sizeof(*power_zone));
|
||||||
|
} else {
|
||||||
|
power_zone = kzalloc(sizeof(*power_zone), GFP_KERNEL);
|
||||||
|
if (!power_zone)
|
||||||
|
return ERR_PTR(-ENOMEM);
|
||||||
|
power_zone->allocated = true;
|
||||||
|
}
|
||||||
|
power_zone->ops = ops;
|
||||||
|
power_zone->control_type_inst = control_type;
|
||||||
|
if (!parent) {
|
||||||
|
power_zone->dev.parent = &control_type->dev;
|
||||||
|
power_zone->parent_idr = &control_type->idr;
|
||||||
|
} else {
|
||||||
|
power_zone->dev.parent = &parent->dev;
|
||||||
|
power_zone->parent_idr = &parent->idr;
|
||||||
|
}
|
||||||
|
power_zone->dev.class = &powercap_class;
|
||||||
|
|
||||||
|
mutex_lock(&control_type->lock);
|
||||||
|
/* Using idr to get the unique id */
|
||||||
|
result = idr_alloc(power_zone->parent_idr, NULL, 0, 0, GFP_KERNEL);
|
||||||
|
if (result < 0)
|
||||||
|
goto err_idr_alloc;
|
||||||
|
|
||||||
|
power_zone->id = result;
|
||||||
|
idr_init(&power_zone->idr);
|
||||||
|
power_zone->name = kstrdup(name, GFP_KERNEL);
|
||||||
|
if (!power_zone->name)
|
||||||
|
goto err_name_alloc;
|
||||||
|
dev_set_name(&power_zone->dev, "%s:%x",
|
||||||
|
dev_name(power_zone->dev.parent),
|
||||||
|
power_zone->id);
|
||||||
|
power_zone->constraints = kzalloc(sizeof(*power_zone->constraints) *
|
||||||
|
nr_constraints, GFP_KERNEL);
|
||||||
|
if (!power_zone->constraints)
|
||||||
|
goto err_const_alloc;
|
||||||
|
|
||||||
|
nr_attrs = nr_constraints * POWERCAP_CONSTRAINTS_ATTRS +
|
||||||
|
POWERCAP_ZONE_MAX_ATTRS + 1;
|
||||||
|
power_zone->zone_dev_attrs = kzalloc(sizeof(void *) *
|
||||||
|
nr_attrs, GFP_KERNEL);
|
||||||
|
if (!power_zone->zone_dev_attrs)
|
||||||
|
goto err_attr_alloc;
|
||||||
|
create_power_zone_common_attributes(power_zone);
|
||||||
|
result = create_constraints(power_zone, nr_constraints, const_ops);
|
||||||
|
if (result)
|
||||||
|
goto err_dev_ret;
|
||||||
|
|
||||||
|
power_zone->zone_dev_attrs[power_zone->zone_attr_count] = NULL;
|
||||||
|
power_zone->dev_zone_attr_group.attrs = power_zone->zone_dev_attrs;
|
||||||
|
power_zone->dev_attr_groups[0] = &power_zone->dev_zone_attr_group;
|
||||||
|
power_zone->dev_attr_groups[1] = NULL;
|
||||||
|
power_zone->dev.groups = power_zone->dev_attr_groups;
|
||||||
|
result = device_register(&power_zone->dev);
|
||||||
|
if (result)
|
||||||
|
goto err_dev_ret;
|
||||||
|
|
||||||
|
control_type->nr_zones++;
|
||||||
|
mutex_unlock(&control_type->lock);
|
||||||
|
|
||||||
|
return power_zone;
|
||||||
|
|
||||||
|
err_dev_ret:
|
||||||
|
kfree(power_zone->zone_dev_attrs);
|
||||||
|
err_attr_alloc:
|
||||||
|
kfree(power_zone->constraints);
|
||||||
|
err_const_alloc:
|
||||||
|
kfree(power_zone->name);
|
||||||
|
err_name_alloc:
|
||||||
|
idr_remove(power_zone->parent_idr, power_zone->id);
|
||||||
|
err_idr_alloc:
|
||||||
|
if (power_zone->allocated)
|
||||||
|
kfree(power_zone);
|
||||||
|
mutex_unlock(&control_type->lock);
|
||||||
|
|
||||||
|
return ERR_PTR(result);
|
||||||
|
}
|
||||||
|
EXPORT_SYMBOL_GPL(powercap_register_zone);
|
||||||
|
|
||||||
|
int powercap_unregister_zone(struct powercap_control_type *control_type,
|
||||||
|
struct powercap_zone *power_zone)
|
||||||
|
{
|
||||||
|
if (!power_zone || !control_type)
|
||||||
|
return -EINVAL;
|
||||||
|
|
||||||
|
mutex_lock(&control_type->lock);
|
||||||
|
control_type->nr_zones--;
|
||||||
|
mutex_unlock(&control_type->lock);
|
||||||
|
|
||||||
|
device_unregister(&power_zone->dev);
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
EXPORT_SYMBOL_GPL(powercap_unregister_zone);
|
||||||
|
|
||||||
|
struct powercap_control_type *powercap_register_control_type(
|
||||||
|
struct powercap_control_type *control_type,
|
||||||
|
const char *name,
|
||||||
|
const struct powercap_control_type_ops *ops)
|
||||||
|
{
|
||||||
|
int result;
|
||||||
|
|
||||||
|
if (!name)
|
||||||
|
return ERR_PTR(-EINVAL);
|
||||||
|
if (control_type) {
|
||||||
|
if (!ops || !ops->release)
|
||||||
|
return ERR_PTR(-EINVAL);
|
||||||
|
memset(control_type, 0, sizeof(*control_type));
|
||||||
|
} else {
|
||||||
|
control_type = kzalloc(sizeof(*control_type), GFP_KERNEL);
|
||||||
|
if (!control_type)
|
||||||
|
return ERR_PTR(-ENOMEM);
|
||||||
|
control_type->allocated = true;
|
||||||
|
}
|
||||||
|
mutex_init(&control_type->lock);
|
||||||
|
control_type->ops = ops;
|
||||||
|
INIT_LIST_HEAD(&control_type->node);
|
||||||
|
control_type->dev.class = &powercap_class;
|
||||||
|
dev_set_name(&control_type->dev, name);
|
||||||
|
result = device_register(&control_type->dev);
|
||||||
|
if (result) {
|
||||||
|
if (control_type->allocated)
|
||||||
|
kfree(control_type);
|
||||||
|
return ERR_PTR(result);
|
||||||
|
}
|
||||||
|
idr_init(&control_type->idr);
|
||||||
|
|
||||||
|
mutex_lock(&powercap_cntrl_list_lock);
|
||||||
|
list_add_tail(&control_type->node, &powercap_cntrl_list);
|
||||||
|
mutex_unlock(&powercap_cntrl_list_lock);
|
||||||
|
|
||||||
|
return control_type;
|
||||||
|
}
|
||||||
|
EXPORT_SYMBOL_GPL(powercap_register_control_type);
|
||||||
|
|
||||||
|
int powercap_unregister_control_type(struct powercap_control_type *control_type)
|
||||||
|
{
|
||||||
|
struct powercap_control_type *pos = NULL;
|
||||||
|
|
||||||
|
if (control_type->nr_zones) {
|
||||||
|
dev_err(&control_type->dev, "Zones of this type still not freed\n");
|
||||||
|
return -EINVAL;
|
||||||
|
}
|
||||||
|
mutex_lock(&powercap_cntrl_list_lock);
|
||||||
|
list_for_each_entry(pos, &powercap_cntrl_list, node) {
|
||||||
|
if (pos == control_type) {
|
||||||
|
list_del(&control_type->node);
|
||||||
|
mutex_unlock(&powercap_cntrl_list_lock);
|
||||||
|
device_unregister(&control_type->dev);
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
mutex_unlock(&powercap_cntrl_list_lock);
|
||||||
|
|
||||||
|
return -ENODEV;
|
||||||
|
}
|
||||||
|
EXPORT_SYMBOL_GPL(powercap_unregister_control_type);
|
||||||
|
|
||||||
|
static int __init powercap_init(void)
|
||||||
|
{
|
||||||
|
int result = 0;
|
||||||
|
|
||||||
|
result = seed_constraint_attributes();
|
||||||
|
if (result)
|
||||||
|
return result;
|
||||||
|
|
||||||
|
result = class_register(&powercap_class);
|
||||||
|
|
||||||
|
return result;
|
||||||
|
}
|
||||||
|
|
||||||
|
device_initcall(powercap_init);
|
||||||
|
|
||||||
|
MODULE_DESCRIPTION("PowerCap sysfs Driver");
|
||||||
|
MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
|
||||||
|
MODULE_LICENSE("GPL v2");
|
||||||
325
include/linux/powercap.h
Normal file
325
include/linux/powercap.h
Normal file
|
|
@ -0,0 +1,325 @@
|
||||||
|
/*
|
||||||
|
* powercap.h: Data types and headers for sysfs power capping interface
|
||||||
|
* Copyright (c) 2013, Intel Corporation.
|
||||||
|
*
|
||||||
|
* This program is free software; you can redistribute it and/or modify it
|
||||||
|
* under the terms and conditions of the GNU General Public License,
|
||||||
|
* version 2, as published by the Free Software Foundation.
|
||||||
|
*
|
||||||
|
* This program is distributed in the hope it will be useful, but WITHOUT
|
||||||
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
||||||
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
||||||
|
* more details.
|
||||||
|
*
|
||||||
|
* You should have received a copy of the GNU General Public License along with
|
||||||
|
* this program; if not, write to the Free Software Foundation, Inc.
|
||||||
|
*
|
||||||
|
*/
|
||||||
|
|
||||||
|
#ifndef __POWERCAP_H__
|
||||||
|
#define __POWERCAP_H__
|
||||||
|
|
||||||
|
#include <linux/device.h>
|
||||||
|
#include <linux/idr.h>
|
||||||
|
|
||||||
|
/*
|
||||||
|
* A power cap class device can contain multiple powercap control_types.
|
||||||
|
* Each control_type can have multiple power zones, which can be independently
|
||||||
|
* controlled. Each power zone can have one or more constraints.
|
||||||
|
*/
|
||||||
|
|
||||||
|
struct powercap_control_type;
|
||||||
|
struct powercap_zone;
|
||||||
|
struct powercap_zone_constraint;
|
||||||
|
|
||||||
|
/**
|
||||||
|
* struct powercap_control_type_ops - Define control type callbacks
|
||||||
|
* @set_enable: Enable/Disable whole control type.
|
||||||
|
* Default is enabled. But this callback allows all zones
|
||||||
|
* to be in disable state and remove any applied power
|
||||||
|
* limits. If disabled power zone can only be monitored
|
||||||
|
* not controlled.
|
||||||
|
* @get_enable: get Enable/Disable status.
|
||||||
|
* @release: Callback to inform that last reference to this
|
||||||
|
* control type is closed. So it is safe to free data
|
||||||
|
* structure associated with this control type.
|
||||||
|
* This callback is mandatory if the client own memory
|
||||||
|
* for the control type.
|
||||||
|
*
|
||||||
|
* This structure defines control type callbacks to be implemented by client
|
||||||
|
* drivers
|
||||||
|
*/
|
||||||
|
struct powercap_control_type_ops {
|
||||||
|
int (*set_enable) (struct powercap_control_type *, bool mode);
|
||||||
|
int (*get_enable) (struct powercap_control_type *, bool *mode);
|
||||||
|
int (*release) (struct powercap_control_type *);
|
||||||
|
};
|
||||||
|
|
||||||
|
/**
|
||||||
|
* struct powercap_control_type- Defines a powercap control_type
|
||||||
|
* @name: name of control_type
|
||||||
|
* @dev: device for this control_type
|
||||||
|
* @idr: idr to have unique id for its child
|
||||||
|
* @root_node: Root holding power zones for this control_type
|
||||||
|
* @ops: Pointer to callback struct
|
||||||
|
* @node_lock: mutex for control type
|
||||||
|
* @allocated: This is possible that client owns the memory
|
||||||
|
* used by this structure. In this case
|
||||||
|
* this flag is set to false by framework to
|
||||||
|
* prevent deallocation during release process.
|
||||||
|
* Otherwise this flag is set to true.
|
||||||
|
* @ctrl_inst: link to the control_type list
|
||||||
|
*
|
||||||
|
* Defines powercap control_type. This acts as a container for power
|
||||||
|
* zones, which use same method to control power. E.g. RAPL, RAPL-PCI etc.
|
||||||
|
* All fields are private and should not be used by client drivers.
|
||||||
|
*/
|
||||||
|
struct powercap_control_type {
|
||||||
|
struct device dev;
|
||||||
|
struct idr idr;
|
||||||
|
int nr_zones;
|
||||||
|
const struct powercap_control_type_ops *ops;
|
||||||
|
struct mutex lock;
|
||||||
|
bool allocated;
|
||||||
|
struct list_head node;
|
||||||
|
};
|
||||||
|
|
||||||
|
/**
|
||||||
|
* struct powercap_zone_ops - Define power zone callbacks
|
||||||
|
* @get_max_energy_range_uj: Get maximum range of energy counter in
|
||||||
|
* micro-joules.
|
||||||
|
* @get_energy_uj: Get current energy counter in micro-joules.
|
||||||
|
* @reset_energy_uj: Reset micro-joules energy counter.
|
||||||
|
* @get_max_power_range_uw: Get maximum range of power counter in
|
||||||
|
* micro-watts.
|
||||||
|
* @get_power_uw: Get current power counter in micro-watts.
|
||||||
|
* @set_enable: Enable/Disable power zone controls.
|
||||||
|
* Default is enabled.
|
||||||
|
* @get_enable: get Enable/Disable status.
|
||||||
|
* @release: Callback to inform that last reference to this
|
||||||
|
* control type is closed. So it is safe to free
|
||||||
|
* data structure associated with this
|
||||||
|
* control type. Mandatory, if client driver owns
|
||||||
|
* the power_zone memory.
|
||||||
|
*
|
||||||
|
* This structure defines zone callbacks to be implemented by client drivers.
|
||||||
|
* Client drives can define both energy and power related callbacks. But at
|
||||||
|
* the least one type (either power or energy) is mandatory. Client drivers
|
||||||
|
* should handle mutual exclusion, if required in callbacks.
|
||||||
|
*/
|
||||||
|
struct powercap_zone_ops {
|
||||||
|
int (*get_max_energy_range_uj) (struct powercap_zone *, u64 *);
|
||||||
|
int (*get_energy_uj) (struct powercap_zone *, u64 *);
|
||||||
|
int (*reset_energy_uj) (struct powercap_zone *);
|
||||||
|
int (*get_max_power_range_uw) (struct powercap_zone *, u64 *);
|
||||||
|
int (*get_power_uw) (struct powercap_zone *, u64 *);
|
||||||
|
int (*set_enable) (struct powercap_zone *, bool mode);
|
||||||
|
int (*get_enable) (struct powercap_zone *, bool *mode);
|
||||||
|
int (*release) (struct powercap_zone *);
|
||||||
|
};
|
||||||
|
|
||||||
|
#define POWERCAP_ZONE_MAX_ATTRS 6
|
||||||
|
#define POWERCAP_CONSTRAINTS_ATTRS 8
|
||||||
|
#define MAX_CONSTRAINTS_PER_ZONE 10
|
||||||
|
/**
|
||||||
|
* struct powercap_zone- Defines instance of a power cap zone
|
||||||
|
* @id: Unique id
|
||||||
|
* @name: Power zone name.
|
||||||
|
* @control_type_inst: Control type instance for this zone.
|
||||||
|
* @ops: Pointer to the zone operation structure.
|
||||||
|
* @dev: Instance of a device.
|
||||||
|
* @const_id_cnt: Number of constraint defined.
|
||||||
|
* @idr: Instance to an idr entry for children zones.
|
||||||
|
* @parent_idr: To remove reference from the parent idr.
|
||||||
|
* @private_data: Private data pointer if any for this zone.
|
||||||
|
* @zone_dev_attrs: Attributes associated with this device.
|
||||||
|
* @zone_attr_count: Attribute count.
|
||||||
|
* @dev_zone_attr_group: Attribute group for attributes.
|
||||||
|
* @dev_attr_groups: Attribute group store to register with device.
|
||||||
|
* @allocated: This is possible that client owns the memory
|
||||||
|
* used by this structure. In this case
|
||||||
|
* this flag is set to false by framework to
|
||||||
|
* prevent deallocation during release process.
|
||||||
|
* Otherwise this flag is set to true.
|
||||||
|
* @constraint_ptr: List of constraints for this zone.
|
||||||
|
*
|
||||||
|
* This defines a power zone instance. The fields of this structure are
|
||||||
|
* private, and should not be used by client drivers.
|
||||||
|
*/
|
||||||
|
struct powercap_zone {
|
||||||
|
int id;
|
||||||
|
char *name;
|
||||||
|
void *control_type_inst;
|
||||||
|
const struct powercap_zone_ops *ops;
|
||||||
|
struct device dev;
|
||||||
|
int const_id_cnt;
|
||||||
|
struct idr idr;
|
||||||
|
struct idr *parent_idr;
|
||||||
|
void *private_data;
|
||||||
|
struct attribute **zone_dev_attrs;
|
||||||
|
int zone_attr_count;
|
||||||
|
struct attribute_group dev_zone_attr_group;
|
||||||
|
const struct attribute_group *dev_attr_groups[2]; /* 1 group + NULL */
|
||||||
|
bool allocated;
|
||||||
|
struct powercap_zone_constraint *constraints;
|
||||||
|
};
|
||||||
|
|
||||||
|
/**
|
||||||
|
* struct powercap_zone_constraint_ops - Define constraint callbacks
|
||||||
|
* @set_power_limit_uw: Set power limit in micro-watts.
|
||||||
|
* @get_power_limit_uw: Get power limit in micro-watts.
|
||||||
|
* @set_time_window_us: Set time window in micro-seconds.
|
||||||
|
* @get_time_window_us: Get time window in micro-seconds.
|
||||||
|
* @get_max_power_uw: Get max power allowed in micro-watts.
|
||||||
|
* @get_min_power_uw: Get min power allowed in micro-watts.
|
||||||
|
* @get_max_time_window_us: Get max time window allowed in micro-seconds.
|
||||||
|
* @get_min_time_window_us: Get min time window allowed in micro-seconds.
|
||||||
|
* @get_name: Get the name of constraint
|
||||||
|
*
|
||||||
|
* This structure is used to define the constraint callbacks for the client
|
||||||
|
* drivers. The following callbacks are mandatory and can't be NULL:
|
||||||
|
* set_power_limit_uw
|
||||||
|
* get_power_limit_uw
|
||||||
|
* set_time_window_us
|
||||||
|
* get_time_window_us
|
||||||
|
* get_name
|
||||||
|
* Client drivers should handle mutual exclusion, if required in callbacks.
|
||||||
|
*/
|
||||||
|
struct powercap_zone_constraint_ops {
|
||||||
|
int (*set_power_limit_uw) (struct powercap_zone *, int, u64);
|
||||||
|
int (*get_power_limit_uw) (struct powercap_zone *, int, u64 *);
|
||||||
|
int (*set_time_window_us) (struct powercap_zone *, int, u64);
|
||||||
|
int (*get_time_window_us) (struct powercap_zone *, int, u64 *);
|
||||||
|
int (*get_max_power_uw) (struct powercap_zone *, int, u64 *);
|
||||||
|
int (*get_min_power_uw) (struct powercap_zone *, int, u64 *);
|
||||||
|
int (*get_max_time_window_us) (struct powercap_zone *, int, u64 *);
|
||||||
|
int (*get_min_time_window_us) (struct powercap_zone *, int, u64 *);
|
||||||
|
const char *(*get_name) (struct powercap_zone *, int);
|
||||||
|
};
|
||||||
|
|
||||||
|
/**
|
||||||
|
* struct powercap_zone_constraint- Defines instance of a constraint
|
||||||
|
* @id: Instance Id of this constraint.
|
||||||
|
* @power_zone: Pointer to the power zone for this constraint.
|
||||||
|
* @ops: Pointer to the constraint callbacks.
|
||||||
|
*
|
||||||
|
* This defines a constraint instance.
|
||||||
|
*/
|
||||||
|
struct powercap_zone_constraint {
|
||||||
|
int id;
|
||||||
|
struct powercap_zone *power_zone;
|
||||||
|
struct powercap_zone_constraint_ops *ops;
|
||||||
|
};
|
||||||
|
|
||||||
|
|
||||||
|
/* For clients to get their device pointer, may be used for dev_dbgs */
|
||||||
|
#define POWERCAP_GET_DEV(power_zone) (&power_zone->dev)
|
||||||
|
|
||||||
|
/**
|
||||||
|
* powercap_set_zone_data() - Set private data for a zone
|
||||||
|
* @power_zone: A pointer to the valid zone instance.
|
||||||
|
* @pdata: A pointer to the user private data.
|
||||||
|
*
|
||||||
|
* Allows client drivers to associate some private data to zone instance.
|
||||||
|
*/
|
||||||
|
static inline void powercap_set_zone_data(struct powercap_zone *power_zone,
|
||||||
|
void *pdata)
|
||||||
|
{
|
||||||
|
if (power_zone)
|
||||||
|
power_zone->private_data = pdata;
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* powercap_get_zone_data() - Get private data for a zone
|
||||||
|
* @power_zone: A pointer to the valid zone instance.
|
||||||
|
*
|
||||||
|
* Allows client drivers to get private data associate with a zone,
|
||||||
|
* using call to powercap_set_zone_data.
|
||||||
|
*/
|
||||||
|
static inline void *powercap_get_zone_data(struct powercap_zone *power_zone)
|
||||||
|
{
|
||||||
|
if (power_zone)
|
||||||
|
return power_zone->private_data;
|
||||||
|
return NULL;
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* powercap_register_control_type() - Register a control_type with framework
|
||||||
|
* @control_type: Pointer to client allocated memory for the control type
|
||||||
|
* structure storage. If this is NULL, powercap framework
|
||||||
|
* will allocate memory and own it.
|
||||||
|
* Advantage of this parameter is that client can embed
|
||||||
|
* this data in its data structures and allocate in a
|
||||||
|
* single call, preventing multiple allocations.
|
||||||
|
* @control_type_name: The Name of this control_type, which will be shown
|
||||||
|
* in the sysfs Interface.
|
||||||
|
* @ops: Callbacks for control type. This parameter is optional.
|
||||||
|
*
|
||||||
|
* Used to create a control_type with the power capping class. Here control_type
|
||||||
|
* can represent a type of technology, which can control a range of power zones.
|
||||||
|
* For example a control_type can be RAPL (Running Average Power Limit)
|
||||||
|
* Intel® 64 and IA-32 Processor Architectures. The name can be any string
|
||||||
|
* which must be unique, otherwise this function returns NULL.
|
||||||
|
* A pointer to the control_type instance is returned on success.
|
||||||
|
*/
|
||||||
|
struct powercap_control_type *powercap_register_control_type(
|
||||||
|
struct powercap_control_type *control_type,
|
||||||
|
const char *name,
|
||||||
|
const struct powercap_control_type_ops *ops);
|
||||||
|
|
||||||
|
/**
|
||||||
|
* powercap_unregister_control_type() - Unregister a control_type from framework
|
||||||
|
* @instance: A pointer to the valid control_type instance.
|
||||||
|
*
|
||||||
|
* Used to unregister a control_type with the power capping class.
|
||||||
|
* All power zones registered under this control type have to be unregistered
|
||||||
|
* before calling this function, or it will fail with an error code.
|
||||||
|
*/
|
||||||
|
int powercap_unregister_control_type(struct powercap_control_type *instance);
|
||||||
|
|
||||||
|
/* Zone register/unregister API */
|
||||||
|
|
||||||
|
/**
|
||||||
|
* powercap_register_zone() - Register a power zone
|
||||||
|
* @power_zone: Pointer to client allocated memory for the power zone structure
|
||||||
|
* storage. If this is NULL, powercap framework will allocate
|
||||||
|
* memory and own it. Advantage of this parameter is that client
|
||||||
|
* can embed this data in its data structures and allocate in a
|
||||||
|
* single call, preventing multiple allocations.
|
||||||
|
* @control_type: A control_type instance under which this zone operates.
|
||||||
|
* @name: A name for this zone.
|
||||||
|
* @parent: A pointer to the parent power zone instance if any or NULL
|
||||||
|
* @ops: Pointer to zone operation callback structure.
|
||||||
|
* @no_constraints: Number of constraints for this zone
|
||||||
|
* @const_ops: Pointer to constraint callback structure
|
||||||
|
*
|
||||||
|
* Register a power zone under a given control type. A power zone must register
|
||||||
|
* a pointer to a structure representing zone callbacks.
|
||||||
|
* A power zone can be located under a parent power zone, in which case @parent
|
||||||
|
* should point to it. Otherwise, if @parent is NULL, the new power zone will
|
||||||
|
* be located directly under the given control type
|
||||||
|
* For each power zone there may be a number of constraints that appear in the
|
||||||
|
* sysfs under that zone as attributes with unique numeric IDs.
|
||||||
|
* Returns pointer to the power_zone on success.
|
||||||
|
*/
|
||||||
|
struct powercap_zone *powercap_register_zone(
|
||||||
|
struct powercap_zone *power_zone,
|
||||||
|
struct powercap_control_type *control_type,
|
||||||
|
const char *name,
|
||||||
|
struct powercap_zone *parent,
|
||||||
|
const struct powercap_zone_ops *ops,
|
||||||
|
int nr_constraints,
|
||||||
|
struct powercap_zone_constraint_ops *const_ops);
|
||||||
|
|
||||||
|
/**
|
||||||
|
* powercap_unregister_zone() - Unregister a zone device
|
||||||
|
* @control_type: A pointer to the valid instance of a control_type.
|
||||||
|
* @power_zone: A pointer to the valid zone instance for a control_type
|
||||||
|
*
|
||||||
|
* Used to unregister a zone device for a control_type. Caller should
|
||||||
|
* make sure that children for this zone are unregistered first.
|
||||||
|
*/
|
||||||
|
int powercap_unregister_zone(struct powercap_control_type *control_type,
|
||||||
|
struct powercap_zone *power_zone);
|
||||||
|
|
||||||
|
#endif
|
||||||
Loading…
Reference in a new issue