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authorLeonard Crestez <leonard.crestez@nxp.com>2019-11-19 01:34:01 +0300
committerGeorgi Djakov <georgi.djakov@linaro.org>2019-12-16 10:49:54 +0300
commit1a0013c62b33158dcb67a3c11872a03be50711a3 (patch)
treec3095e63c7641e7e50fcf15f2065870c34dda832 /drivers/interconnect
parentb92c35e1b9c9211635df9e8fb060c69311871865 (diff)
downloadlinux-1a0013c62b33158dcb67a3c11872a03be50711a3.tar.xz
interconnect: Add interconnect_graph file to debugfs
The interconnect graphs can be difficult to understand and the current "interconnect_summary" file doesn't even display links in any way. Add a new "interconnect_graph" file to debugfs in the graphviz "dot" format which describes interconnect providers, nodes and links. The file is human-readable and can be visualized by piping through graphviz. Example: ssh $TARGET cat /sys/kernel/debug/interconnect/interconnect_graph \ | dot -Tsvg > interconnect_graph.svg Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
Diffstat (limited to 'drivers/interconnect')
-rw-r--r--drivers/interconnect/core.c66
1 files changed, 66 insertions, 0 deletions
diff --git a/drivers/interconnect/core.c b/drivers/interconnect/core.c
index 03625406c69f..63c164264b73 100644
--- a/drivers/interconnect/core.c
+++ b/drivers/interconnect/core.c
@@ -71,6 +71,70 @@ static int icc_summary_show(struct seq_file *s, void *data)
}
DEFINE_SHOW_ATTRIBUTE(icc_summary);
+static void icc_graph_show_link(struct seq_file *s, int level,
+ struct icc_node *n, struct icc_node *m)
+{
+ seq_printf(s, "%s\"%d:%s\" -> \"%d:%s\"\n",
+ level == 2 ? "\t\t" : "\t",
+ n->id, n->name, m->id, m->name);
+}
+
+static void icc_graph_show_node(struct seq_file *s, struct icc_node *n)
+{
+ seq_printf(s, "\t\t\"%d:%s\" [label=\"%d:%s",
+ n->id, n->name, n->id, n->name);
+ seq_printf(s, "\n\t\t\t|avg_bw=%ukBps", n->avg_bw);
+ seq_printf(s, "\n\t\t\t|peak_bw=%ukBps", n->peak_bw);
+ seq_puts(s, "\"]\n");
+}
+
+static int icc_graph_show(struct seq_file *s, void *data)
+{
+ struct icc_provider *provider;
+ struct icc_node *n;
+ int cluster_index = 0;
+ int i;
+
+ seq_puts(s, "digraph {\n\trankdir = LR\n\tnode [shape = record]\n");
+ mutex_lock(&icc_lock);
+
+ /* draw providers as cluster subgraphs */
+ cluster_index = 0;
+ list_for_each_entry(provider, &icc_providers, provider_list) {
+ seq_printf(s, "\tsubgraph cluster_%d {\n", ++cluster_index);
+ if (provider->dev)
+ seq_printf(s, "\t\tlabel = \"%s\"\n",
+ dev_name(provider->dev));
+
+ /* draw nodes */
+ list_for_each_entry(n, &provider->nodes, node_list)
+ icc_graph_show_node(s, n);
+
+ /* draw internal links */
+ list_for_each_entry(n, &provider->nodes, node_list)
+ for (i = 0; i < n->num_links; ++i)
+ if (n->provider == n->links[i]->provider)
+ icc_graph_show_link(s, 2, n,
+ n->links[i]);
+
+ seq_puts(s, "\t}\n");
+ }
+
+ /* draw external links */
+ list_for_each_entry(provider, &icc_providers, provider_list)
+ list_for_each_entry(n, &provider->nodes, node_list)
+ for (i = 0; i < n->num_links; ++i)
+ if (n->provider != n->links[i]->provider)
+ icc_graph_show_link(s, 1, n,
+ n->links[i]);
+
+ mutex_unlock(&icc_lock);
+ seq_puts(s, "}");
+
+ return 0;
+}
+DEFINE_SHOW_ATTRIBUTE(icc_graph);
+
static struct icc_node *node_find(const int id)
{
return idr_find(&icc_idr, id);
@@ -827,6 +891,8 @@ 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);
+ debugfs_create_file("interconnect_graph", 0444,
+ icc_debugfs_dir, NULL, &icc_graph_fops);
return 0;
}