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interconnect: Add debugfs support 

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Georgi Djakov 2019-01-16 18:10:59 +02:00 committed by Greg Kroah-Hartman
parent 87e3031b6f
commit 3697ff4340
1 changed files with 70 additions and 0 deletions
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70
drivers/interconnect/core.c
View File

@ -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>
@ -21,6 +22,7 @@
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 +50,59 @@ 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 +766,21 @@ 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");