1 files changed, 157 insertions, 0 deletions
diff --git a/drivers/platform/raspberrypi/vchiq-interface/vchiq_debugfs.c b/drivers/platform/raspberrypi/vchiq-interface/vchiq_debugfs.c
new file mode 100644
index 000000000000..c82326a9b6d9
--- /dev/null
+++ b/drivers/platform/raspberrypi/vchiq-interface/vchiq_debugfs.c
@@ -0,0 +1,157 @@
+// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
+/*
+ * Copyright (c) 2014 Raspberry Pi (Trading) Ltd. All rights reserved.
+ * Copyright (c) 2010-2012 Broadcom. All rights reserved.
+ */
+
+#include <linux/debugfs.h>
+#include <linux/raspberrypi/vchiq_core.h>
+#include <linux/raspberrypi/vchiq_arm.h>
+#include <linux/raspberrypi/vchiq_debugfs.h>
+
+#ifdef CONFIG_DEBUG_FS
+
+#define DEBUGFS_WRITE_BUF_SIZE 256
+
+/* Global 'vchiq' debugfs and clients entry used by all instances */
+static struct dentry *vchiq_dbg_dir;
+static struct dentry *vchiq_dbg_clients;
+
+static int debugfs_usecount_show(struct seq_file *f, void *offset)
+{
+	struct vchiq_instance *instance = f->private;
+	int use_count;
+
+	use_count = vchiq_instance_get_use_count(instance);
+	seq_printf(f, "%d\n", use_count);
+
+	return 0;
+}
+DEFINE_SHOW_ATTRIBUTE(debugfs_usecount);
+
+static int debugfs_trace_show(struct seq_file *f, void *offset)
+{
+	struct vchiq_instance *instance = f->private;
+	int trace;
+
+	trace = vchiq_instance_get_trace(instance);
+	seq_printf(f, "%s\n", trace ? "Y" : "N");
+
+	return 0;
+}
+
+static int vchiq_dump_show(struct seq_file *f, void *offset)
+{
+	struct vchiq_state *state = f->private;
+
+	vchiq_dump_state(f, state);
+
+	return 0;
+}
+DEFINE_SHOW_ATTRIBUTE(vchiq_dump);
+
+static int debugfs_trace_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, debugfs_trace_show, inode->i_private);
+}
+
+static ssize_t debugfs_trace_write(struct file *file,
+	const char __user *buffer,
+	size_t count, loff_t *ppos)
+{
+	struct seq_file *f = (struct seq_file *)file->private_data;
+	struct vchiq_instance *instance = f->private;
+	char firstchar;
+
+	if (copy_from_user(&firstchar, buffer, 1))
+		return -EFAULT;
+
+	switch (firstchar) {
+	case 'Y':
+	case 'y':
+	case '1':
+		vchiq_instance_set_trace(instance, 1);
+		break;
+	case 'N':
+	case 'n':
+	case '0':
+		vchiq_instance_set_trace(instance, 0);
+		break;
+	default:
+		break;
+	}
+
+	*ppos += count;
+
+	return count;
+}
+
+static const struct file_operations debugfs_trace_fops = {
+	.owner		= THIS_MODULE,
+	.open		= debugfs_trace_open,
+	.write		= debugfs_trace_write,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= single_release,
+};
+
+/* add an instance (process) to the debugfs entries */
+void vchiq_debugfs_add_instance(struct vchiq_instance *instance)
+{
+	char pidstr[16];
+	struct dentry *top;
+
+	snprintf(pidstr, sizeof(pidstr), "%d",
+		 vchiq_instance_get_pid(instance));
+
+	top = debugfs_create_dir(pidstr, vchiq_dbg_clients);
+
+	debugfs_create_file("use_count", 0444, top, instance,
+			    &debugfs_usecount_fops);
+	debugfs_create_file("trace", 0644, top, instance, &debugfs_trace_fops);
+
+	vchiq_instance_get_debugfs_node(instance)->dentry = top;
+}
+
+void vchiq_debugfs_remove_instance(struct vchiq_instance *instance)
+{
+	struct vchiq_debugfs_node *node =
+				vchiq_instance_get_debugfs_node(instance);
+
+	debugfs_remove_recursive(node->dentry);
+}
+
+void vchiq_debugfs_init(struct vchiq_state *state)
+{
+	vchiq_dbg_dir = debugfs_create_dir("vchiq", NULL);
+	vchiq_dbg_clients = debugfs_create_dir("clients", vchiq_dbg_dir);
+
+	debugfs_create_file("state", S_IFREG | 0444, vchiq_dbg_dir, state,
+			    &vchiq_dump_fops);
+}
+
+/* remove all the debugfs entries */
+void vchiq_debugfs_deinit(void)
+{
+	debugfs_remove_recursive(vchiq_dbg_dir);
+}
+
+#else /* CONFIG_DEBUG_FS */
+
+void vchiq_debugfs_init(struct vchiq_state *state)
+{
+}
+
+void vchiq_debugfs_deinit(void)
+{
+}
+
+void vchiq_debugfs_add_instance(struct vchiq_instance *instance)
+{
+}
+
+void vchiq_debugfs_remove_instance(struct vchiq_instance *instance)
+{
+}
+
+#endif /* CONFIG_DEBUG_FS */