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Subject[PATCH v6 3/8] interconnect: Add debugfs support
Date
Add a functionality to provide information about the current constraints
per each node and provider.

Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
---
drivers/interconnect/core.c | 78 +++++++++++++++++++++++++++++++++++++
1 file changed, 78 insertions(+)

diff --git a/drivers/interconnect/core.c b/drivers/interconnect/core.c
index 63707c3c3d48..3f5001f51bb7 100644
--- a/drivers/interconnect/core.c
+++ b/drivers/interconnect/core.c
@@ -6,6 +6,7 @@
* Author: Georgi Djakov <georgi.djakov@linaro.org>
*/

+#include <linux/debugfs.h>
#include <linux/device.h>
#include <linux/idr.h>
#include <linux/init.h>
@@ -15,10 +16,12 @@
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/slab.h>
+#include <linux/uaccess.h>

static DEFINE_IDR(icc_idr);
static LIST_HEAD(icc_provider_list);
static DEFINE_MUTEX(icc_lock);
+static struct dentry *icc_debugfs_dir;

/**
* struct icc_req - constraints that are attached to each node
@@ -47,6 +50,81 @@ struct icc_path {
struct icc_req reqs[];
};

+#ifdef CONFIG_DEBUG_FS
+
+static void icc_summary_show_one(struct seq_file *s, struct icc_node *n)
+{
+ if (!n)
+ return;
+
+ seq_printf(s, "%-30s %12d %12d\n",
+ n->name, n->avg_bw, n->peak_bw);
+}
+
+static int icc_summary_show(struct seq_file *s, void *data)
+{
+ struct icc_provider *provider;
+
+ seq_puts(s, " node avg peak\n");
+ seq_puts(s, "--------------------------------------------------------\n");
+
+ mutex_lock(&icc_lock);
+
+ list_for_each_entry(provider, &icc_provider_list, provider_list) {
+ struct icc_node *n;
+
+ list_for_each_entry(n, &provider->nodes, node_list) {
+ struct icc_req *r;
+
+ icc_summary_show_one(s, n);
+ hlist_for_each_entry(r, &n->req_list, req_node) {
+ if (!r->dev)
+ continue;
+
+ seq_printf(s, " %-26s %12d %12d\n",
+ dev_name(r->dev), r->avg_bw,
+ r->peak_bw);
+ }
+ }
+ }
+
+ mutex_unlock(&icc_lock);
+
+ return 0;
+}
+
+static int icc_summary_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, icc_summary_show, inode->i_private);
+}
+
+static const struct file_operations icc_summary_fops = {
+ .open = icc_summary_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static int __init icc_debugfs_init(void)
+{
+ struct dentry *file;
+
+ icc_debugfs_dir = debugfs_create_dir("interconnect", NULL);
+ if (!icc_debugfs_dir) {
+ pr_err("interconnect: error creating debugfs directory\n");
+ return -ENODEV;
+ }
+
+ file = debugfs_create_file("interconnect_summary", 0444,
+ icc_debugfs_dir, NULL, &icc_summary_fops);
+ if (!file)
+ return -ENODEV;
+
+ return 0;
+}
+late_initcall(icc_debugfs_init);
+#endif
+
static struct icc_node *node_find(const int id)
{
return idr_find(&icc_idr, id);
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