mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-06 09:06:39 +07:00
530 lines
12 KiB
C
530 lines
12 KiB
C
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/*
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* System Trace Module (STM) master/channel allocation policy management
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* Copyright (c) 2014, 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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* A master/channel allocation policy allows mapping string identifiers to
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* master and channel ranges, where allocation can be done.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/types.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/configfs.h>
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#include <linux/slab.h>
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#include <linux/stm.h>
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#include "stm.h"
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/*
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* STP Master/Channel allocation policy configfs layout.
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*/
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struct stp_policy {
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struct config_group group;
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struct stm_device *stm;
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};
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struct stp_policy_node {
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struct config_group group;
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struct stp_policy *policy;
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unsigned int first_master;
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unsigned int last_master;
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unsigned int first_channel;
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unsigned int last_channel;
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};
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static struct configfs_subsystem stp_policy_subsys;
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void stp_policy_node_get_ranges(struct stp_policy_node *policy_node,
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unsigned int *mstart, unsigned int *mend,
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unsigned int *cstart, unsigned int *cend)
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{
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*mstart = policy_node->first_master;
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*mend = policy_node->last_master;
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*cstart = policy_node->first_channel;
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*cend = policy_node->last_channel;
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}
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static inline char *stp_policy_node_name(struct stp_policy_node *policy_node)
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{
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return policy_node->group.cg_item.ci_name ? : "<none>";
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}
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static inline struct stp_policy *to_stp_policy(struct config_item *item)
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{
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return item ?
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container_of(to_config_group(item), struct stp_policy, group) :
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NULL;
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}
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static inline struct stp_policy_node *
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to_stp_policy_node(struct config_item *item)
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{
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return item ?
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container_of(to_config_group(item), struct stp_policy_node,
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group) :
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NULL;
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}
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static ssize_t stp_policy_node_masters_show(struct stp_policy_node *policy_node,
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char *page)
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{
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ssize_t count;
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count = sprintf(page, "%u %u\n", policy_node->first_master,
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policy_node->last_master);
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return count;
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}
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static ssize_t
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stp_policy_node_masters_store(struct stp_policy_node *policy_node,
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const char *page, size_t count)
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{
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unsigned int first, last;
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struct stm_device *stm;
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char *p = (char *)page;
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ssize_t ret = -ENODEV;
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if (sscanf(p, "%u %u", &first, &last) != 2)
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return -EINVAL;
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mutex_lock(&stp_policy_subsys.su_mutex);
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stm = policy_node->policy->stm;
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if (!stm)
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goto unlock;
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/* must be within [sw_start..sw_end], which is an inclusive range */
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if (first > INT_MAX || last > INT_MAX || first > last ||
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first < stm->data->sw_start ||
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last > stm->data->sw_end) {
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ret = -ERANGE;
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goto unlock;
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}
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ret = count;
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policy_node->first_master = first;
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policy_node->last_master = last;
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unlock:
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mutex_unlock(&stp_policy_subsys.su_mutex);
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return ret;
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}
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static ssize_t
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stp_policy_node_channels_show(struct stp_policy_node *policy_node, char *page)
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{
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ssize_t count;
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count = sprintf(page, "%u %u\n", policy_node->first_channel,
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policy_node->last_channel);
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return count;
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}
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static ssize_t
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stp_policy_node_channels_store(struct stp_policy_node *policy_node,
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const char *page, size_t count)
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{
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unsigned int first, last;
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struct stm_device *stm;
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char *p = (char *)page;
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ssize_t ret = -ENODEV;
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if (sscanf(p, "%u %u", &first, &last) != 2)
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return -EINVAL;
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mutex_lock(&stp_policy_subsys.su_mutex);
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stm = policy_node->policy->stm;
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if (!stm)
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goto unlock;
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if (first > INT_MAX || last > INT_MAX || first > last ||
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last >= stm->data->sw_nchannels) {
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ret = -ERANGE;
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goto unlock;
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}
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ret = count;
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policy_node->first_channel = first;
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policy_node->last_channel = last;
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unlock:
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mutex_unlock(&stp_policy_subsys.su_mutex);
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return ret;
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}
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static void stp_policy_node_release(struct config_item *item)
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{
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kfree(to_stp_policy_node(item));
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}
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struct stp_policy_node_attribute {
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struct configfs_attribute attr;
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ssize_t (*show)(struct stp_policy_node *, char *);
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ssize_t (*store)(struct stp_policy_node *, const char *, size_t);
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};
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static ssize_t stp_policy_node_attr_show(struct config_item *item,
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struct configfs_attribute *attr,
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char *page)
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{
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struct stp_policy_node *policy_node = to_stp_policy_node(item);
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struct stp_policy_node_attribute *pn_attr =
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container_of(attr, struct stp_policy_node_attribute, attr);
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ssize_t count = 0;
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if (pn_attr->show)
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count = pn_attr->show(policy_node, page);
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return count;
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}
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static ssize_t stp_policy_node_attr_store(struct config_item *item,
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struct configfs_attribute *attr,
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const char *page, size_t len)
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{
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struct stp_policy_node *policy_node = to_stp_policy_node(item);
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struct stp_policy_node_attribute *pn_attr =
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container_of(attr, struct stp_policy_node_attribute, attr);
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ssize_t count = -EINVAL;
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if (pn_attr->store)
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count = pn_attr->store(policy_node, page, len);
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return count;
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}
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static struct configfs_item_operations stp_policy_node_item_ops = {
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.release = stp_policy_node_release,
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.show_attribute = stp_policy_node_attr_show,
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.store_attribute = stp_policy_node_attr_store,
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};
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static struct stp_policy_node_attribute stp_policy_node_attr_range = {
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.attr = {
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.ca_owner = THIS_MODULE,
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.ca_name = "masters",
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.ca_mode = S_IRUGO | S_IWUSR,
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},
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.show = stp_policy_node_masters_show,
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.store = stp_policy_node_masters_store,
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};
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static struct stp_policy_node_attribute stp_policy_node_attr_channels = {
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.attr = {
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.ca_owner = THIS_MODULE,
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.ca_name = "channels",
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.ca_mode = S_IRUGO | S_IWUSR,
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},
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.show = stp_policy_node_channels_show,
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.store = stp_policy_node_channels_store,
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};
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static struct configfs_attribute *stp_policy_node_attrs[] = {
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&stp_policy_node_attr_range.attr,
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&stp_policy_node_attr_channels.attr,
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NULL,
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};
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static struct config_item_type stp_policy_type;
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static struct config_item_type stp_policy_node_type;
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static struct config_group *
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stp_policy_node_make(struct config_group *group, const char *name)
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{
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struct stp_policy_node *policy_node, *parent_node;
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struct stp_policy *policy;
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if (group->cg_item.ci_type == &stp_policy_type) {
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policy = container_of(group, struct stp_policy, group);
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} else {
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parent_node = container_of(group, struct stp_policy_node,
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group);
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policy = parent_node->policy;
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}
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if (!policy->stm)
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return ERR_PTR(-ENODEV);
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policy_node = kzalloc(sizeof(struct stp_policy_node), GFP_KERNEL);
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if (!policy_node)
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return ERR_PTR(-ENOMEM);
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config_group_init_type_name(&policy_node->group, name,
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&stp_policy_node_type);
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policy_node->policy = policy;
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/* default values for the attributes */
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policy_node->first_master = policy->stm->data->sw_start;
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policy_node->last_master = policy->stm->data->sw_end;
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policy_node->first_channel = 0;
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policy_node->last_channel = policy->stm->data->sw_nchannels - 1;
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return &policy_node->group;
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}
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static void
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stp_policy_node_drop(struct config_group *group, struct config_item *item)
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{
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config_item_put(item);
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}
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static struct configfs_group_operations stp_policy_node_group_ops = {
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.make_group = stp_policy_node_make,
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.drop_item = stp_policy_node_drop,
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};
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static struct config_item_type stp_policy_node_type = {
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.ct_item_ops = &stp_policy_node_item_ops,
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.ct_group_ops = &stp_policy_node_group_ops,
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.ct_attrs = stp_policy_node_attrs,
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.ct_owner = THIS_MODULE,
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};
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/*
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* Root group: policies.
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*/
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static struct configfs_attribute stp_policy_attr_device = {
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.ca_owner = THIS_MODULE,
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.ca_name = "device",
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.ca_mode = S_IRUGO,
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};
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static struct configfs_attribute *stp_policy_attrs[] = {
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&stp_policy_attr_device,
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NULL,
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};
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static ssize_t stp_policy_attr_show(struct config_item *item,
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struct configfs_attribute *attr,
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char *page)
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{
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struct stp_policy *policy = to_stp_policy(item);
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ssize_t count;
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count = sprintf(page, "%s\n",
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(policy && policy->stm) ?
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policy->stm->data->name :
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"<none>");
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return count;
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}
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void stp_policy_unbind(struct stp_policy *policy)
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{
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struct stm_device *stm = policy->stm;
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if (WARN_ON_ONCE(!policy->stm))
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return;
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mutex_lock(&stm->policy_mutex);
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stm->policy = NULL;
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mutex_unlock(&stm->policy_mutex);
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policy->stm = NULL;
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stm_put_device(stm);
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}
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static void stp_policy_release(struct config_item *item)
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{
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struct stp_policy *policy = to_stp_policy(item);
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stp_policy_unbind(policy);
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kfree(policy);
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}
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static struct configfs_item_operations stp_policy_item_ops = {
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.release = stp_policy_release,
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.show_attribute = stp_policy_attr_show,
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};
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static struct configfs_group_operations stp_policy_group_ops = {
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.make_group = stp_policy_node_make,
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};
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static struct config_item_type stp_policy_type = {
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.ct_item_ops = &stp_policy_item_ops,
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.ct_group_ops = &stp_policy_group_ops,
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.ct_attrs = stp_policy_attrs,
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.ct_owner = THIS_MODULE,
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};
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static struct config_group *
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stp_policies_make(struct config_group *group, const char *name)
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{
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struct config_group *ret;
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struct stm_device *stm;
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char *devname, *p;
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devname = kasprintf(GFP_KERNEL, "%s", name);
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if (!devname)
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return ERR_PTR(-ENOMEM);
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/*
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* node must look like <device_name>.<policy_name>, where
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* <device_name> is the name of an existing stm device and
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* <policy_name> is an arbitrary string
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*/
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p = strchr(devname, '.');
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if (!p) {
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kfree(devname);
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return ERR_PTR(-EINVAL);
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}
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*p++ = '\0';
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stm = stm_find_device(devname);
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kfree(devname);
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if (!stm)
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return ERR_PTR(-ENODEV);
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mutex_lock(&stm->policy_mutex);
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if (stm->policy) {
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ret = ERR_PTR(-EBUSY);
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goto unlock_policy;
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}
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stm->policy = kzalloc(sizeof(*stm->policy), GFP_KERNEL);
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if (!stm->policy) {
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ret = ERR_PTR(-ENOMEM);
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goto unlock_policy;
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}
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config_group_init_type_name(&stm->policy->group, name,
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&stp_policy_type);
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stm->policy->stm = stm;
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ret = &stm->policy->group;
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unlock_policy:
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mutex_unlock(&stm->policy_mutex);
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if (IS_ERR(ret))
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stm_put_device(stm);
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return ret;
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}
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static struct configfs_group_operations stp_policies_group_ops = {
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.make_group = stp_policies_make,
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};
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static struct config_item_type stp_policies_type = {
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.ct_group_ops = &stp_policies_group_ops,
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.ct_owner = THIS_MODULE,
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};
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static struct configfs_subsystem stp_policy_subsys = {
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.su_group = {
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.cg_item = {
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.ci_namebuf = "stp-policy",
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.ci_type = &stp_policies_type,
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},
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},
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};
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/*
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* Lock the policy mutex from the outside
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*/
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static struct stp_policy_node *
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__stp_policy_node_lookup(struct stp_policy *policy, char *s)
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{
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struct stp_policy_node *policy_node, *ret;
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||
|
struct list_head *head = &policy->group.cg_children;
|
||
|
struct config_item *item;
|
||
|
char *start, *end = s;
|
||
|
|
||
|
if (list_empty(head))
|
||
|
return NULL;
|
||
|
|
||
|
/* return the first entry if everything else fails */
|
||
|
item = list_entry(head->next, struct config_item, ci_entry);
|
||
|
ret = to_stp_policy_node(item);
|
||
|
|
||
|
next:
|
||
|
for (;;) {
|
||
|
start = strsep(&end, "/");
|
||
|
if (!start)
|
||
|
break;
|
||
|
|
||
|
if (!*start)
|
||
|
continue;
|
||
|
|
||
|
list_for_each_entry(item, head, ci_entry) {
|
||
|
policy_node = to_stp_policy_node(item);
|
||
|
|
||
|
if (!strcmp(start,
|
||
|
policy_node->group.cg_item.ci_name)) {
|
||
|
ret = policy_node;
|
||
|
|
||
|
if (!end)
|
||
|
goto out;
|
||
|
|
||
|
head = &policy_node->group.cg_children;
|
||
|
goto next;
|
||
|
}
|
||
|
}
|
||
|
break;
|
||
|
}
|
||
|
|
||
|
out:
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
|
||
|
struct stp_policy_node *
|
||
|
stp_policy_node_lookup(struct stm_device *stm, char *s)
|
||
|
{
|
||
|
struct stp_policy_node *policy_node = NULL;
|
||
|
|
||
|
mutex_lock(&stp_policy_subsys.su_mutex);
|
||
|
|
||
|
mutex_lock(&stm->policy_mutex);
|
||
|
if (stm->policy)
|
||
|
policy_node = __stp_policy_node_lookup(stm->policy, s);
|
||
|
mutex_unlock(&stm->policy_mutex);
|
||
|
|
||
|
if (policy_node)
|
||
|
config_item_get(&policy_node->group.cg_item);
|
||
|
mutex_unlock(&stp_policy_subsys.su_mutex);
|
||
|
|
||
|
return policy_node;
|
||
|
}
|
||
|
|
||
|
void stp_policy_node_put(struct stp_policy_node *policy_node)
|
||
|
{
|
||
|
config_item_put(&policy_node->group.cg_item);
|
||
|
}
|
||
|
|
||
|
int __init stp_configfs_init(void)
|
||
|
{
|
||
|
int err;
|
||
|
|
||
|
config_group_init(&stp_policy_subsys.su_group);
|
||
|
mutex_init(&stp_policy_subsys.su_mutex);
|
||
|
err = configfs_register_subsystem(&stp_policy_subsys);
|
||
|
|
||
|
return err;
|
||
|
}
|
||
|
|
||
|
void __exit stp_configfs_exit(void)
|
||
|
{
|
||
|
configfs_unregister_subsystem(&stp_policy_subsys);
|
||
|
}
|