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a8dfe193a6
We must ensure that the tag is not changed while we aggregate the
requests. Currently the icc_set_tag() is not using any locks and this
may cause the values to be aggregated incorrectly. Fix this by acquiring
the icc_lock while we set the tag.
Link: https://lore.kernel.org/lkml/20191018141750.17032-1-georgi.djakov@linaro.org/
Fixes: 127ab2cc5f
("interconnect: Add support for path tags")
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
818 lines
19 KiB
C
818 lines
19 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Interconnect framework core driver
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*
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* Copyright (c) 2017-2019, Linaro Ltd.
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* Author: Georgi Djakov <georgi.djakov@linaro.org>
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*/
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#include <linux/debugfs.h>
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#include <linux/device.h>
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#include <linux/idr.h>
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#include <linux/init.h>
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#include <linux/interconnect.h>
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#include <linux/interconnect-provider.h>
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#include <linux/list.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/slab.h>
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#include <linux/of.h>
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#include <linux/overflow.h>
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static DEFINE_IDR(icc_idr);
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static LIST_HEAD(icc_providers);
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static DEFINE_MUTEX(icc_lock);
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static struct dentry *icc_debugfs_dir;
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/**
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* struct icc_req - constraints that are attached to each node
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* @req_node: entry in list of requests for the particular @node
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* @node: the interconnect node to which this constraint applies
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* @dev: reference to the device that sets the constraints
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* @tag: path tag (optional)
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* @avg_bw: an integer describing the average bandwidth in kBps
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* @peak_bw: an integer describing the peak bandwidth in kBps
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*/
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struct icc_req {
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struct hlist_node req_node;
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struct icc_node *node;
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struct device *dev;
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u32 tag;
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u32 avg_bw;
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u32 peak_bw;
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};
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/**
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* struct icc_path - interconnect path structure
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* @num_nodes: number of hops (nodes)
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* @reqs: array of the requests applicable to this path of nodes
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*/
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struct icc_path {
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size_t num_nodes;
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struct icc_req reqs[];
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};
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static void icc_summary_show_one(struct seq_file *s, struct icc_node *n)
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{
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if (!n)
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return;
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seq_printf(s, "%-30s %12u %12u\n",
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n->name, n->avg_bw, n->peak_bw);
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}
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static int icc_summary_show(struct seq_file *s, void *data)
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{
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struct icc_provider *provider;
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seq_puts(s, " node avg peak\n");
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seq_puts(s, "--------------------------------------------------------\n");
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mutex_lock(&icc_lock);
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list_for_each_entry(provider, &icc_providers, provider_list) {
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struct icc_node *n;
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list_for_each_entry(n, &provider->nodes, node_list) {
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struct icc_req *r;
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icc_summary_show_one(s, n);
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hlist_for_each_entry(r, &n->req_list, req_node) {
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if (!r->dev)
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continue;
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seq_printf(s, " %-26s %12u %12u\n",
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dev_name(r->dev), r->avg_bw,
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r->peak_bw);
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}
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}
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}
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mutex_unlock(&icc_lock);
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return 0;
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}
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DEFINE_SHOW_ATTRIBUTE(icc_summary);
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static struct icc_node *node_find(const int id)
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{
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return idr_find(&icc_idr, id);
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}
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static struct icc_path *path_init(struct device *dev, struct icc_node *dst,
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ssize_t num_nodes)
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{
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struct icc_node *node = dst;
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struct icc_path *path;
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int i;
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path = kzalloc(struct_size(path, reqs, num_nodes), GFP_KERNEL);
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if (!path)
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return ERR_PTR(-ENOMEM);
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path->num_nodes = num_nodes;
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for (i = num_nodes - 1; i >= 0; i--) {
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node->provider->users++;
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hlist_add_head(&path->reqs[i].req_node, &node->req_list);
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path->reqs[i].node = node;
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path->reqs[i].dev = dev;
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/* reference to previous node was saved during path traversal */
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node = node->reverse;
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}
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return path;
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}
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static struct icc_path *path_find(struct device *dev, struct icc_node *src,
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struct icc_node *dst)
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{
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struct icc_path *path = ERR_PTR(-EPROBE_DEFER);
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struct icc_node *n, *node = NULL;
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struct list_head traverse_list;
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struct list_head edge_list;
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struct list_head visited_list;
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size_t i, depth = 1;
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bool found = false;
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INIT_LIST_HEAD(&traverse_list);
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INIT_LIST_HEAD(&edge_list);
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INIT_LIST_HEAD(&visited_list);
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list_add(&src->search_list, &traverse_list);
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src->reverse = NULL;
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do {
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list_for_each_entry_safe(node, n, &traverse_list, search_list) {
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if (node == dst) {
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found = true;
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list_splice_init(&edge_list, &visited_list);
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list_splice_init(&traverse_list, &visited_list);
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break;
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}
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for (i = 0; i < node->num_links; i++) {
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struct icc_node *tmp = node->links[i];
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if (!tmp) {
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path = ERR_PTR(-ENOENT);
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goto out;
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}
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if (tmp->is_traversed)
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continue;
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tmp->is_traversed = true;
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tmp->reverse = node;
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list_add_tail(&tmp->search_list, &edge_list);
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}
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}
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if (found)
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break;
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list_splice_init(&traverse_list, &visited_list);
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list_splice_init(&edge_list, &traverse_list);
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/* count the hops including the source */
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depth++;
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} while (!list_empty(&traverse_list));
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out:
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/* reset the traversed state */
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list_for_each_entry_reverse(n, &visited_list, search_list)
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n->is_traversed = false;
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if (found)
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path = path_init(dev, dst, depth);
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return path;
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}
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/*
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* We want the path to honor all bandwidth requests, so the average and peak
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* bandwidth requirements from each consumer are aggregated at each node.
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* The aggregation is platform specific, so each platform can customize it by
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* implementing its own aggregate() function.
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*/
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static int aggregate_requests(struct icc_node *node)
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{
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struct icc_provider *p = node->provider;
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struct icc_req *r;
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node->avg_bw = 0;
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node->peak_bw = 0;
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if (p->pre_aggregate)
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p->pre_aggregate(node);
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hlist_for_each_entry(r, &node->req_list, req_node)
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p->aggregate(node, r->tag, r->avg_bw, r->peak_bw,
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&node->avg_bw, &node->peak_bw);
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return 0;
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}
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static int apply_constraints(struct icc_path *path)
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{
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struct icc_node *next, *prev = NULL;
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int ret = -EINVAL;
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int i;
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for (i = 0; i < path->num_nodes; i++) {
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next = path->reqs[i].node;
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/*
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* Both endpoints should be valid master-slave pairs of the
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* same interconnect provider that will be configured.
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*/
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if (!prev || next->provider != prev->provider) {
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prev = next;
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continue;
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}
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/* set the constraints */
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ret = next->provider->set(prev, next);
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if (ret)
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goto out;
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prev = next;
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}
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out:
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return ret;
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}
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/* of_icc_xlate_onecell() - Translate function using a single index.
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* @spec: OF phandle args to map into an interconnect node.
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* @data: private data (pointer to struct icc_onecell_data)
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*
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* This is a generic translate function that can be used to model simple
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* interconnect providers that have one device tree node and provide
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* multiple interconnect nodes. A single cell is used as an index into
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* an array of icc nodes specified in the icc_onecell_data struct when
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* registering the provider.
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*/
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struct icc_node *of_icc_xlate_onecell(struct of_phandle_args *spec,
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void *data)
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{
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struct icc_onecell_data *icc_data = data;
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unsigned int idx = spec->args[0];
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if (idx >= icc_data->num_nodes) {
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pr_err("%s: invalid index %u\n", __func__, idx);
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return ERR_PTR(-EINVAL);
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}
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return icc_data->nodes[idx];
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}
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EXPORT_SYMBOL_GPL(of_icc_xlate_onecell);
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/**
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* of_icc_get_from_provider() - Look-up interconnect node
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* @spec: OF phandle args to use for look-up
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*
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* Looks for interconnect provider under the node specified by @spec and if
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* found, uses xlate function of the provider to map phandle args to node.
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*
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* Returns a valid pointer to struct icc_node on success or ERR_PTR()
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* on failure.
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*/
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static struct icc_node *of_icc_get_from_provider(struct of_phandle_args *spec)
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{
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struct icc_node *node = ERR_PTR(-EPROBE_DEFER);
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struct icc_provider *provider;
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if (!spec || spec->args_count != 1)
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return ERR_PTR(-EINVAL);
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mutex_lock(&icc_lock);
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list_for_each_entry(provider, &icc_providers, provider_list) {
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if (provider->dev->of_node == spec->np)
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node = provider->xlate(spec, provider->data);
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if (!IS_ERR(node))
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break;
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}
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mutex_unlock(&icc_lock);
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return node;
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}
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/**
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* of_icc_get() - get a path handle from a DT node based on name
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* @dev: device pointer for the consumer device
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* @name: interconnect path name
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*
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* This function will search for a path between two endpoints and return an
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* icc_path handle on success. Use icc_put() to release constraints when they
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* are not needed anymore.
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* If the interconnect API is disabled, NULL is returned and the consumer
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* drivers will still build. Drivers are free to handle this specifically,
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* but they don't have to.
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*
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* Return: icc_path pointer on success or ERR_PTR() on error. NULL is returned
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* when the API is disabled or the "interconnects" DT property is missing.
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*/
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struct icc_path *of_icc_get(struct device *dev, const char *name)
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{
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struct icc_path *path = ERR_PTR(-EPROBE_DEFER);
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struct icc_node *src_node, *dst_node;
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struct device_node *np = NULL;
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struct of_phandle_args src_args, dst_args;
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int idx = 0;
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int ret;
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if (!dev || !dev->of_node)
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return ERR_PTR(-ENODEV);
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np = dev->of_node;
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/*
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* When the consumer DT node do not have "interconnects" property
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* return a NULL path to skip setting constraints.
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*/
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if (!of_find_property(np, "interconnects", NULL))
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return NULL;
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/*
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* We use a combination of phandle and specifier for endpoint. For now
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* lets support only global ids and extend this in the future if needed
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* without breaking DT compatibility.
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*/
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if (name) {
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idx = of_property_match_string(np, "interconnect-names", name);
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if (idx < 0)
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return ERR_PTR(idx);
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}
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ret = of_parse_phandle_with_args(np, "interconnects",
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"#interconnect-cells", idx * 2,
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&src_args);
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if (ret)
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return ERR_PTR(ret);
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of_node_put(src_args.np);
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ret = of_parse_phandle_with_args(np, "interconnects",
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"#interconnect-cells", idx * 2 + 1,
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&dst_args);
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if (ret)
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return ERR_PTR(ret);
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of_node_put(dst_args.np);
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src_node = of_icc_get_from_provider(&src_args);
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if (IS_ERR(src_node)) {
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if (PTR_ERR(src_node) != -EPROBE_DEFER)
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dev_err(dev, "error finding src node: %ld\n",
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PTR_ERR(src_node));
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return ERR_CAST(src_node);
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}
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dst_node = of_icc_get_from_provider(&dst_args);
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if (IS_ERR(dst_node)) {
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if (PTR_ERR(dst_node) != -EPROBE_DEFER)
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dev_err(dev, "error finding dst node: %ld\n",
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PTR_ERR(dst_node));
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return ERR_CAST(dst_node);
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}
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mutex_lock(&icc_lock);
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path = path_find(dev, src_node, dst_node);
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if (IS_ERR(path))
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dev_err(dev, "%s: invalid path=%ld\n", __func__, PTR_ERR(path));
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mutex_unlock(&icc_lock);
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return path;
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}
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EXPORT_SYMBOL_GPL(of_icc_get);
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/**
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* icc_set_tag() - set an optional tag on a path
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* @path: the path we want to tag
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* @tag: the tag value
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*
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* This function allows consumers to append a tag to the requests associated
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* with a path, so that a different aggregation could be done based on this tag.
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*/
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void icc_set_tag(struct icc_path *path, u32 tag)
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{
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int i;
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if (!path)
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return;
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mutex_lock(&icc_lock);
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for (i = 0; i < path->num_nodes; i++)
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path->reqs[i].tag = tag;
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mutex_unlock(&icc_lock);
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}
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EXPORT_SYMBOL_GPL(icc_set_tag);
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/**
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* icc_set_bw() - set bandwidth constraints on an interconnect path
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* @path: reference to the path returned by icc_get()
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* @avg_bw: average bandwidth in kilobytes per second
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* @peak_bw: peak bandwidth in kilobytes per second
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*
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* This function is used by an interconnect consumer to express its own needs
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* in terms of bandwidth for a previously requested path between two endpoints.
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* The requests are aggregated and each node is updated accordingly. The entire
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* path is locked by a mutex to ensure that the set() is completed.
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* The @path can be NULL when the "interconnects" DT properties is missing,
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* which will mean that no constraints will be set.
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*
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* Returns 0 on success, or an appropriate error code otherwise.
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*/
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int icc_set_bw(struct icc_path *path, u32 avg_bw, u32 peak_bw)
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{
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struct icc_node *node;
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u32 old_avg, old_peak;
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size_t i;
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int ret;
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if (!path || !path->num_nodes)
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return 0;
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mutex_lock(&icc_lock);
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old_avg = path->reqs[0].avg_bw;
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old_peak = path->reqs[0].peak_bw;
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for (i = 0; i < path->num_nodes; i++) {
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node = path->reqs[i].node;
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/* update the consumer request for this path */
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path->reqs[i].avg_bw = avg_bw;
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path->reqs[i].peak_bw = peak_bw;
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/* aggregate requests for this node */
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aggregate_requests(node);
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}
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ret = apply_constraints(path);
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if (ret) {
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pr_debug("interconnect: error applying constraints (%d)\n",
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ret);
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for (i = 0; i < path->num_nodes; i++) {
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node = path->reqs[i].node;
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path->reqs[i].avg_bw = old_avg;
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path->reqs[i].peak_bw = old_peak;
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aggregate_requests(node);
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}
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apply_constraints(path);
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}
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mutex_unlock(&icc_lock);
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return ret;
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}
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EXPORT_SYMBOL_GPL(icc_set_bw);
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/**
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* icc_get() - return a handle for path between two endpoints
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* @dev: the device requesting the path
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* @src_id: source device port id
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* @dst_id: destination device port id
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*
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* This function will search for a path between two endpoints and return an
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* icc_path handle on success. Use icc_put() to release
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* constraints when they are not needed anymore.
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* If the interconnect API is disabled, NULL is returned and the consumer
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* drivers will still build. Drivers are free to handle this specifically,
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* but they don't have to.
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*
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* Return: icc_path pointer on success, ERR_PTR() on error or NULL if the
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* interconnect API is disabled.
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*/
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struct icc_path *icc_get(struct device *dev, const int src_id, const int dst_id)
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{
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struct icc_node *src, *dst;
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struct icc_path *path = ERR_PTR(-EPROBE_DEFER);
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mutex_lock(&icc_lock);
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src = node_find(src_id);
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if (!src)
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goto out;
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dst = node_find(dst_id);
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if (!dst)
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goto out;
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path = path_find(dev, src, dst);
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if (IS_ERR(path))
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dev_err(dev, "%s: invalid path=%ld\n", __func__, PTR_ERR(path));
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out:
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mutex_unlock(&icc_lock);
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return path;
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}
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EXPORT_SYMBOL_GPL(icc_get);
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/**
|
|
* icc_put() - release the reference to the icc_path
|
|
* @path: interconnect path
|
|
*
|
|
* Use this function to release the constraints on a path when the path is
|
|
* no longer needed. The constraints will be re-aggregated.
|
|
*/
|
|
void icc_put(struct icc_path *path)
|
|
{
|
|
struct icc_node *node;
|
|
size_t i;
|
|
int ret;
|
|
|
|
if (!path || WARN_ON(IS_ERR(path)))
|
|
return;
|
|
|
|
ret = icc_set_bw(path, 0, 0);
|
|
if (ret)
|
|
pr_err("%s: error (%d)\n", __func__, ret);
|
|
|
|
mutex_lock(&icc_lock);
|
|
for (i = 0; i < path->num_nodes; i++) {
|
|
node = path->reqs[i].node;
|
|
hlist_del(&path->reqs[i].req_node);
|
|
if (!WARN_ON(!node->provider->users))
|
|
node->provider->users--;
|
|
}
|
|
mutex_unlock(&icc_lock);
|
|
|
|
kfree(path);
|
|
}
|
|
EXPORT_SYMBOL_GPL(icc_put);
|
|
|
|
static struct icc_node *icc_node_create_nolock(int id)
|
|
{
|
|
struct icc_node *node;
|
|
|
|
/* check if node already exists */
|
|
node = node_find(id);
|
|
if (node)
|
|
return node;
|
|
|
|
node = kzalloc(sizeof(*node), GFP_KERNEL);
|
|
if (!node)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
id = idr_alloc(&icc_idr, node, id, id + 1, GFP_KERNEL);
|
|
if (id < 0) {
|
|
WARN(1, "%s: couldn't get idr\n", __func__);
|
|
kfree(node);
|
|
return ERR_PTR(id);
|
|
}
|
|
|
|
node->id = id;
|
|
|
|
return node;
|
|
}
|
|
|
|
/**
|
|
* icc_node_create() - create a node
|
|
* @id: node id
|
|
*
|
|
* Return: icc_node pointer on success, or ERR_PTR() on error
|
|
*/
|
|
struct icc_node *icc_node_create(int id)
|
|
{
|
|
struct icc_node *node;
|
|
|
|
mutex_lock(&icc_lock);
|
|
|
|
node = icc_node_create_nolock(id);
|
|
|
|
mutex_unlock(&icc_lock);
|
|
|
|
return node;
|
|
}
|
|
EXPORT_SYMBOL_GPL(icc_node_create);
|
|
|
|
/**
|
|
* icc_node_destroy() - destroy a node
|
|
* @id: node id
|
|
*/
|
|
void icc_node_destroy(int id)
|
|
{
|
|
struct icc_node *node;
|
|
|
|
mutex_lock(&icc_lock);
|
|
|
|
node = node_find(id);
|
|
if (node) {
|
|
idr_remove(&icc_idr, node->id);
|
|
WARN_ON(!hlist_empty(&node->req_list));
|
|
}
|
|
|
|
mutex_unlock(&icc_lock);
|
|
|
|
kfree(node);
|
|
}
|
|
EXPORT_SYMBOL_GPL(icc_node_destroy);
|
|
|
|
/**
|
|
* icc_link_create() - create a link between two nodes
|
|
* @node: source node id
|
|
* @dst_id: destination node id
|
|
*
|
|
* Create a link between two nodes. The nodes might belong to different
|
|
* interconnect providers and the @dst_id node might not exist (if the
|
|
* provider driver has not probed yet). So just create the @dst_id node
|
|
* and when the actual provider driver is probed, the rest of the node
|
|
* data is filled.
|
|
*
|
|
* Return: 0 on success, or an error code otherwise
|
|
*/
|
|
int icc_link_create(struct icc_node *node, const int dst_id)
|
|
{
|
|
struct icc_node *dst;
|
|
struct icc_node **new;
|
|
int ret = 0;
|
|
|
|
if (!node->provider)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&icc_lock);
|
|
|
|
dst = node_find(dst_id);
|
|
if (!dst) {
|
|
dst = icc_node_create_nolock(dst_id);
|
|
|
|
if (IS_ERR(dst)) {
|
|
ret = PTR_ERR(dst);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
new = krealloc(node->links,
|
|
(node->num_links + 1) * sizeof(*node->links),
|
|
GFP_KERNEL);
|
|
if (!new) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
node->links = new;
|
|
node->links[node->num_links++] = dst;
|
|
|
|
out:
|
|
mutex_unlock(&icc_lock);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(icc_link_create);
|
|
|
|
/**
|
|
* icc_link_destroy() - destroy a link between two nodes
|
|
* @src: pointer to source node
|
|
* @dst: pointer to destination node
|
|
*
|
|
* Return: 0 on success, or an error code otherwise
|
|
*/
|
|
int icc_link_destroy(struct icc_node *src, struct icc_node *dst)
|
|
{
|
|
struct icc_node **new;
|
|
size_t slot;
|
|
int ret = 0;
|
|
|
|
if (IS_ERR_OR_NULL(src))
|
|
return -EINVAL;
|
|
|
|
if (IS_ERR_OR_NULL(dst))
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&icc_lock);
|
|
|
|
for (slot = 0; slot < src->num_links; slot++)
|
|
if (src->links[slot] == dst)
|
|
break;
|
|
|
|
if (WARN_ON(slot == src->num_links)) {
|
|
ret = -ENXIO;
|
|
goto out;
|
|
}
|
|
|
|
src->links[slot] = src->links[--src->num_links];
|
|
|
|
new = krealloc(src->links, src->num_links * sizeof(*src->links),
|
|
GFP_KERNEL);
|
|
if (new)
|
|
src->links = new;
|
|
|
|
out:
|
|
mutex_unlock(&icc_lock);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(icc_link_destroy);
|
|
|
|
/**
|
|
* icc_node_add() - add interconnect node to interconnect provider
|
|
* @node: pointer to the interconnect node
|
|
* @provider: pointer to the interconnect provider
|
|
*/
|
|
void icc_node_add(struct icc_node *node, struct icc_provider *provider)
|
|
{
|
|
mutex_lock(&icc_lock);
|
|
|
|
node->provider = provider;
|
|
list_add_tail(&node->node_list, &provider->nodes);
|
|
|
|
mutex_unlock(&icc_lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(icc_node_add);
|
|
|
|
/**
|
|
* icc_node_del() - delete interconnect node from interconnect provider
|
|
* @node: pointer to the interconnect node
|
|
*/
|
|
void icc_node_del(struct icc_node *node)
|
|
{
|
|
mutex_lock(&icc_lock);
|
|
|
|
list_del(&node->node_list);
|
|
|
|
mutex_unlock(&icc_lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(icc_node_del);
|
|
|
|
/**
|
|
* icc_provider_add() - add a new interconnect provider
|
|
* @provider: the interconnect provider that will be added into topology
|
|
*
|
|
* Return: 0 on success, or an error code otherwise
|
|
*/
|
|
int icc_provider_add(struct icc_provider *provider)
|
|
{
|
|
if (WARN_ON(!provider->set))
|
|
return -EINVAL;
|
|
if (WARN_ON(!provider->xlate))
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&icc_lock);
|
|
|
|
INIT_LIST_HEAD(&provider->nodes);
|
|
list_add_tail(&provider->provider_list, &icc_providers);
|
|
|
|
mutex_unlock(&icc_lock);
|
|
|
|
dev_dbg(provider->dev, "interconnect provider added to topology\n");
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(icc_provider_add);
|
|
|
|
/**
|
|
* icc_provider_del() - delete previously added interconnect provider
|
|
* @provider: the interconnect provider that will be removed from topology
|
|
*
|
|
* Return: 0 on success, or an error code otherwise
|
|
*/
|
|
int icc_provider_del(struct icc_provider *provider)
|
|
{
|
|
mutex_lock(&icc_lock);
|
|
if (provider->users) {
|
|
pr_warn("interconnect provider still has %d users\n",
|
|
provider->users);
|
|
mutex_unlock(&icc_lock);
|
|
return -EBUSY;
|
|
}
|
|
|
|
if (!list_empty(&provider->nodes)) {
|
|
pr_warn("interconnect provider still has nodes\n");
|
|
mutex_unlock(&icc_lock);
|
|
return -EBUSY;
|
|
}
|
|
|
|
list_del(&provider->provider_list);
|
|
mutex_unlock(&icc_lock);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(icc_provider_del);
|
|
|
|
static int __init icc_init(void)
|
|
{
|
|
icc_debugfs_dir = debugfs_create_dir("interconnect", NULL);
|
|
debugfs_create_file("interconnect_summary", 0444,
|
|
icc_debugfs_dir, NULL, &icc_summary_fops);
|
|
return 0;
|
|
}
|
|
|
|
static void __exit icc_exit(void)
|
|
{
|
|
debugfs_remove_recursive(icc_debugfs_dir);
|
|
}
|
|
module_init(icc_init);
|
|
module_exit(icc_exit);
|
|
|
|
MODULE_AUTHOR("Georgi Djakov <georgi.djakov@linaro.org>");
|
|
MODULE_DESCRIPTION("Interconnect Driver Core");
|
|
MODULE_LICENSE("GPL v2");
|