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600c395bf6
The powercap_zone_ops and powercap_zone_constraint_ops structures are never modified, so declare them as const. Most of the actual changes adjust indentation to accomodate the const keyword. Done with the help of Coccinelle. Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
691 lines
19 KiB
C
691 lines
19 KiB
C
/*
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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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return 0;
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err_alloc:
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free_constraint_attributes();
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return ret;
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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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const 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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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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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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}
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power_zone->zone_attr_count = count;
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return ret;
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}
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static bool control_type_valid(void *control_type)
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{
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struct powercap_control_type *pos = NULL;
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bool found = false;
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mutex_lock(&powercap_cntrl_list_lock);
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list_for_each_entry(pos, &powercap_cntrl_list, node) {
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if (pos == control_type) {
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found = true;
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break;
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}
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}
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mutex_unlock(&powercap_cntrl_list_lock);
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return found;
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}
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static ssize_t name_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct powercap_zone *power_zone = to_powercap_zone(dev);
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return sprintf(buf, "%s\n", power_zone->name);
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}
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static DEVICE_ATTR_RO(name);
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/* Create zone and attributes in sysfs */
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static void create_power_zone_common_attributes(
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struct powercap_zone *power_zone)
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{
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int count = 0;
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power_zone->zone_dev_attrs[count++] = &dev_attr_name.attr;
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if (power_zone->ops->get_max_energy_range_uj)
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power_zone->zone_dev_attrs[count++] =
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&dev_attr_max_energy_range_uj.attr;
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if (power_zone->ops->get_energy_uj) {
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if (power_zone->ops->reset_energy_uj)
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dev_attr_energy_uj.attr.mode = S_IWUSR | S_IRUGO;
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else
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dev_attr_energy_uj.attr.mode = S_IRUGO;
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power_zone->zone_dev_attrs[count++] =
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&dev_attr_energy_uj.attr;
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}
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if (power_zone->ops->get_power_uw)
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power_zone->zone_dev_attrs[count++] =
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&dev_attr_power_uw.attr;
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if (power_zone->ops->get_max_power_range_uw)
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power_zone->zone_dev_attrs[count++] =
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&dev_attr_max_power_range_uw.attr;
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power_zone->zone_dev_attrs[count] = NULL;
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power_zone->zone_attr_count = count;
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}
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static void powercap_release(struct device *dev)
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{
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bool allocated;
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if (dev->parent) {
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struct powercap_zone *power_zone = to_powercap_zone(dev);
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/* Store flag as the release() may free memory */
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allocated = power_zone->allocated;
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/* Remove id from parent idr struct */
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idr_remove(power_zone->parent_idr, power_zone->id);
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/* Destroy idrs allocated for this zone */
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idr_destroy(&power_zone->idr);
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kfree(power_zone->name);
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kfree(power_zone->zone_dev_attrs);
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kfree(power_zone->constraints);
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if (power_zone->ops->release)
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power_zone->ops->release(power_zone);
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if (allocated)
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kfree(power_zone);
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} else {
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struct powercap_control_type *control_type =
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to_powercap_control_type(dev);
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/* Store flag as the release() may free memory */
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allocated = control_type->allocated;
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idr_destroy(&control_type->idr);
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mutex_destroy(&control_type->lock);
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if (control_type->ops && control_type->ops->release)
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control_type->ops->release(control_type);
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if (allocated)
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kfree(control_type);
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}
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}
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static ssize_t enabled_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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bool mode = true;
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/* Default is enabled */
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if (dev->parent) {
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struct powercap_zone *power_zone = to_powercap_zone(dev);
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if (power_zone->ops->get_enable)
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if (power_zone->ops->get_enable(power_zone, &mode))
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mode = false;
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} else {
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struct powercap_control_type *control_type =
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to_powercap_control_type(dev);
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if (control_type->ops && control_type->ops->get_enable)
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if (control_type->ops->get_enable(control_type, &mode))
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mode = false;
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}
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return sprintf(buf, "%d\n", mode);
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}
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static ssize_t enabled_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t len)
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{
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bool mode;
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if (strtobool(buf, &mode))
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return -EINVAL;
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if (dev->parent) {
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struct powercap_zone *power_zone = to_powercap_zone(dev);
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if (power_zone->ops->set_enable)
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if (!power_zone->ops->set_enable(power_zone, mode))
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return len;
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} else {
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struct powercap_control_type *control_type =
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to_powercap_control_type(dev);
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if (control_type->ops && control_type->ops->set_enable)
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if (!control_type->ops->set_enable(control_type, mode))
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return len;
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}
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return -ENOSYS;
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}
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static DEVICE_ATTR_RW(enabled);
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static struct attribute *powercap_attrs[] = {
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&dev_attr_enabled.attr,
|
|
NULL,
|
|
};
|
|
ATTRIBUTE_GROUPS(powercap);
|
|
|
|
static struct class powercap_class = {
|
|
.name = "powercap",
|
|
.dev_release = powercap_release,
|
|
.dev_groups = powercap_groups,
|
|
};
|
|
|
|
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,
|
|
const 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, "%s", 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");
|