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// SPDX-License-Identifier: GPL-2.0
/* OcteonTX2 RVU Resource Manager driver
*
* Copyright (C) 2018 Marvell International Ltd.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/pci.h>
#include <linux/sysfs.h>
#include "quota.h"
static ssize_t quota_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
struct quota *quota;
int val;
quota = container_of(attr, struct quota, sysfs);
if (quota->base->lock)
mutex_lock(quota->base->lock);
val = quota->val;
if (quota->base->lock)
mutex_unlock(quota->base->lock);
return snprintf(buf, PAGE_SIZE, "%d\n", val);
}
static ssize_t quota_store(struct kobject *kobj, struct kobj_attribute *attr,
const char *buf, size_t count)
{
struct quota *quota;
struct quotas *base;
struct device *dev;
int old_val, new_val, res = 0;
u64 lf_sum;
quota = container_of(attr, struct quota, sysfs);
dev = quota->dev;
base = quota->base;
if (kstrtoint(buf, 0, &new_val)) {
dev_err(dev, "Invalid %s quota: %s\n", attr->attr.name, buf);
return -EIO;
}
if (new_val < 0) {
dev_err(dev, "Invalid %s quota: %d < 0\n", attr->attr.name,
new_val);
return -EIO;
}
if (new_val > base->max) {
dev_err(dev, "Invalid %s quota: %d > %d\n", attr->attr.name,
new_val, base->max);
return -EIO;
}
if (base->lock)
mutex_lock(base->lock);
old_val = quota->val;
if (base->ops.pre_store)
res = base->ops.pre_store(quota->ops_arg, quota, new_val);
if (res != 0) {
res = -EIO;
goto unlock;
}
lf_sum = quotas_get_sum(quota->base);
if (lf_sum + new_val - quota->val > base->max_sum) {
dev_err(dev,
"Not enough resources for %s quota. Used: %lld, Max: %lld\n",
attr->attr.name, lf_sum, base->max_sum);
res = -EIO;
goto unlock;
}
quota->val = new_val;
if (base->ops.post_store)
base->ops.post_store(quota->ops_arg, quota, old_val);
res = count;
unlock:
if (base->lock)
mutex_unlock(base->lock);
return res;
}
struct quotas *quotas_alloc(u32 cnt, u32 max, u64 max_sum,
int init_val, struct mutex *lock,
struct quota_ops *ops)
{
struct quotas *quotas;
u64 i;
if (cnt == 0)
return NULL;
quotas = kzalloc(sizeof(struct quotas) + cnt * sizeof(struct quota),
GFP_KERNEL);
if (quotas == NULL)
return NULL;
for (i = 0; i < cnt; i++) {
quotas->a[i].base = quotas;
quotas->a[i].val = init_val;
}
quotas->cnt = cnt;
quotas->max = max;
quotas->max_sum = max_sum;
if (ops) {
quotas->ops.pre_store = ops->pre_store;
quotas->ops.post_store = ops->post_store;
}
quotas->lock = lock;
return quotas;
}
void quotas_free(struct quotas *quotas)
{
u64 i;
if (quotas == NULL)
return;
WARN_ON(quotas->cnt == 0);
for (i = 0; i < quotas->cnt; i++)
quota_sysfs_destroy("as->a[i]);
kfree(quotas);
}
int quota_sysfs_create(const char *name, struct kobject *parent,
struct device *log_dev, struct quota *quota,
void *ops_arg)
{
int err;
if (name == NULL || quota == NULL || log_dev == NULL)
return -EINVAL;
quota->sysfs.show = quota_show;
quota->sysfs.store = quota_store;
quota->sysfs.attr.name = name;
quota->sysfs.attr.mode = 0644;
quota->parent = parent;
quota->dev = log_dev;
quota->ops_arg = ops_arg;
sysfs_attr_init("a->sysfs.attr);
err = sysfs_create_file(quota->parent, "a->sysfs.attr);
if (err) {
dev_err(quota->dev,
"Failed to create '%s' quota sysfs for '%s'\n",
name, kobject_name(quota->parent));
return -EFAULT;
}
return 0;
}
int quota_sysfs_destroy(struct quota *quota)
{
if (quota == NULL)
return -EINVAL;
if (quota->sysfs.attr.mode != 0) {
sysfs_remove_file(quota->parent, "a->sysfs.attr);
quota->sysfs.attr.mode = 0;
}
return 0;
}
u64 quotas_get_sum(struct quotas *quotas)
{
u64 lf_sum = 0;
int i;
for (i = 0; i < quotas->cnt; i++)
lf_sum += quotas->a[i].val;
return lf_sum;
}
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