diff options
Diffstat (limited to 'drivers/soc/marvell/octeontx2-rm/quota.c')
| -rw-r--r-- | drivers/soc/marvell/octeontx2-rm/quota.c | 192 |
1 files changed, 192 insertions, 0 deletions
diff --git a/drivers/soc/marvell/octeontx2-rm/quota.c b/drivers/soc/marvell/octeontx2-rm/quota.c new file mode 100644 index 000000000000..361b903cf86c --- /dev/null +++ b/drivers/soc/marvell/octeontx2-rm/quota.c @@ -0,0 +1,192 @@ +// 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; +} + |