qcacmn: Add debugfs support for DBR ring debug

For each DBR ring, add debugfs entry to dump at real-time the ring
parameters like head, tail index, the timestamps at which a buffer is
received and replenished. Issues that are specific to tail index
movement from the target can be identified with this debugfs entry.

CRs-Fixed: 2466514
Change-Id: Iafbc61726264464212cb783a1cce46e16b8a48ff

qdf/inc/qdf_debugfs.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017-2018 The Linux Foundation. All rights reserved.
+ * Copyright (c) 2017-2019 The Linux Foundation. All rights reserved.
  *
  * Permission to use, copy, modify, and/or distribute this software for
  * any purpose with or without fee is hereby granted, provided that the
@@ -240,6 +240,43 @@ void qdf_debugfs_remove_dir(qdf_dentry_t d);
  */
 void qdf_debugfs_remove_file(qdf_dentry_t d);
 
+/**
+ * qdf_debugfs_create_file_simplified() - Create a simple debugfs file
+ * where a single function call produces all the desired output
+ * @name: name of the file
+ * @mode: qdf file mode
+ * @parent: parent node. If NULL, defaults to base 'qdf_debugfs_root'
+ * @fops: file operations { .show, .write , .priv... }
+ *
+ * Users just have to define the show() function and pass it via @fops.show()
+ * argument. When the output time comes, the show() will be called once.
+ * The show() function must do everything that is needed to write the data,
+ * all in one function call.
+ * This is useful either for writing small amounts of data to debugfs or
+ * for cases in which the output is not iterative.
+ * The private data can be passed via @fops.priv, which will be available
+ * inside the show() function as the 'private' filed of the qdf_debugfs_file_t.
+ *
+ * Return: dentry structure pointer in case of success, otherwise NULL.
+ *
+ */
+
+qdf_dentry_t qdf_debugfs_create_file_simplified(const char *name, uint16_t mode,
+						qdf_dentry_t parent,
+						struct qdf_debugfs_fops *fops);
+
+/**
+ * qdf_debugfs_printer() - Print formated string into debugfs file
+ * @priv: The private data
+ * @fmt: Format string
+ * @...: arguments for the format string
+ *
+ * This function prints a new line character after printing the formatted
+ * string into the debugfs file.
+ * This function can be passed when the argument is of type qdf_abstract_print
+ */
+int qdf_debugfs_printer(void *priv, const char *fmt, ...);
+
 #else /* WLAN_DEBUGFS */
 
 static inline QDF_STATUS qdf_debugfs_init(void)
@@ -333,5 +370,18 @@ static inline void qdf_debugfs_remove_dir_recursive(qdf_dentry_t d) {}
 static inline void qdf_debugfs_remove_dir(qdf_dentry_t d) {}
 static inline void qdf_debugfs_remove_file(qdf_dentry_t d) {}
 
+static inline
+qdf_dentry_t qdf_debugfs_create_file_simplified(const char *name, uint16_t mode,
+						qdf_dentry_t parent,
+						struct qdf_debugfs_fops *fops)
+{
+	return NULL;
+}
+
+static inline
+int qdf_debugfs_printer(void *priv, const char *fmt, ...)
+{
+	return 0;
+}
 #endif /* WLAN_DEBUGFS */
 #endif /* _QDF_DEBUGFS_H */