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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>
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@ -6,6 +6,7 @@
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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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@ -21,6 +22,7 @@
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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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@ -48,6 +50,59 @@ struct icc_path {
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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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static int icc_summary_open(struct inode *inode, struct file *file)
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{
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return single_open(file, icc_summary_show, inode->i_private);
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}
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static const struct file_operations icc_summary_fops = {
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.open = icc_summary_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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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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@ -711,6 +766,21 @@ int icc_provider_del(struct icc_provider *provider)
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}
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EXPORT_SYMBOL_GPL(icc_provider_del);
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static int __init icc_init(void)
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{
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icc_debugfs_dir = debugfs_create_dir("interconnect", NULL);
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debugfs_create_file("interconnect_summary", 0444,
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icc_debugfs_dir, NULL, &icc_summary_fops);
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return 0;
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}
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static void __exit icc_exit(void)
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{
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debugfs_remove_recursive(icc_debugfs_dir);
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}
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module_init(icc_init);
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module_exit(icc_exit);
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MODULE_AUTHOR("Georgi Djakov <georgi.djakov@linaro.org>");
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MODULE_DESCRIPTION("Interconnect Driver Core");
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MODULE_LICENSE("GPL v2");
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