[PATCH v12 4/7] interconnect: Add debugfs support

Georgi Djakov
2018-12-08T17:02:13Z

Add a functionality to provide information about the current constraints
per each node and provider.

Reviewed-by: Evan Green <evgreen@chromium.org>
Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
---
drivers/interconnect/core.c | 71 +++++++++++++++++++++++++++++++++++++
1 file changed, 71 insertions(+)

diff --git a/drivers/interconnect/core.c b/drivers/interconnect/core.c
index d1854dfb1bed..5a98192e92ad 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>
@@ -17,10 +18,12 @@
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/overflow.h>
+#include <linux/uaccess.h>

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

/**
* struct icc_req - constraints that are attached to each node
@@ -48,6 +51,59 @@ struct icc_path {
struct icc_req reqs[];
};

+static void icc_summary_show_one(struct seq_file *s, struct icc_node *n)
+{
+ if (!n)
+ return;
+
+ seq_printf(s, "%-30s %12u %12u\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_providers, 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 %12u %12u\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 struct icc_node *node_find(const int id)
{
return idr_find(&icc_idr, id);
@@ -711,6 +767,21 @@ int icc_provider_del(struct icc_provider *provider)
}
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");