From d07cfa4b67e060b53d9710f5797e107190f636ee Mon Sep 17 00:00:00 2001
From: Karthik Kantamneni <vkantamn@codeaurora.org>
Date: Mon, 3 Sep 2018 15:01:10 +0530
Subject: [PATCH] qcacmn: Add qdf debugfs API to detect buffer overflow

Add API to query qdf debugfs buffer overflow.
Add support to dump log in different block sizes.

Change-Id: I3d5b63ef2f9b0eeb4df20dbb93a76f10ed10f556
CRs-Fixed: 2307897
---
 qdf/inc/qdf_debugfs.h       | 23 ++++++++++++++++++++---
 qdf/linux/src/qdf_debugfs.c | 14 +++++++++-----
 2 files changed, 29 insertions(+), 8 deletions(-)

diff --git a/qdf/inc/qdf_debugfs.h b/qdf/inc/qdf_debugfs.h
index 99017e1b38aa..b4e965ccd8df 100644
--- a/qdf/inc/qdf_debugfs.h
+++ b/qdf/inc/qdf_debugfs.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017 The Linux Foundation. All rights reserved.
+ * Copyright (c) 2017-2018 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
@@ -111,10 +111,21 @@ void qdf_debugfs_printf(qdf_debugfs_file_t file, const char *f, ...);
  * @file: debugfs file handle passed in fops->show() function.
  * @buf: data
  * @len: data length
+ * @rowsize: row size in bytes to dump
+ * @groupsize: group size in bytes to dump
  *
  */
 void qdf_debugfs_hexdump(qdf_debugfs_file_t file, const uint8_t *buf,
-			 qdf_size_t len);
+			 qdf_size_t len, int rowsize, int groupsize);
+
+/**
+ * qdf_debugfs_overflow() - check overflow occurrence in debugfs buffer
+ * @file: debugfs file handle passed in fops->show() function.
+ *
+ * Return: 1 on overflow occurrence else 0
+ *
+ */
+bool qdf_debugfs_overflow(qdf_debugfs_file_t file);
 
 /**
  * qdf_debugfs_write() - write data into debugfs file
@@ -260,10 +271,16 @@ static inline void qdf_debugfs_printf(qdf_debugfs_file_t file, const char *f,
 }
 
 static inline void qdf_debugfs_hexdump(qdf_debugfs_file_t file,
-				       const uint8_t *buf, qdf_size_t len)
+				       const uint8_t *buf, qdf_size_t len,
+				       int rowsize, int groupsize)
 {
 }
 
+static inline bool qdf_debugfs_overflow(qdf_debugfs_file_t file)
+{
+	return 0;
+}
+
 static inline void qdf_debugfs_write(qdf_debugfs_file_t file,
 				     const uint8_t *buf, qdf_size_t len)
 {
diff --git a/qdf/linux/src/qdf_debugfs.c b/qdf/linux/src/qdf_debugfs.c
index 054a1ee12d3f..66664a96274c 100644
--- a/qdf/linux/src/qdf_debugfs.c
+++ b/qdf/linux/src/qdf_debugfs.c
@@ -170,18 +170,17 @@ void qdf_debugfs_printf(qdf_debugfs_file_t file, const char *f, ...)
 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4, 4, 0))
 
 void qdf_debugfs_hexdump(qdf_debugfs_file_t file, const uint8_t *buf,
-			 qdf_size_t len)
+			 qdf_size_t len, int rowsize, int groupsize)
 {
-	seq_hex_dump(file, "", DUMP_PREFIX_OFFSET, 16, 4, buf, len, false);
+	seq_hex_dump(file, "", DUMP_PREFIX_OFFSET, rowsize, groupsize, buf, len,
+		     false);
 }
 
 #else
 
 void qdf_debugfs_hexdump(qdf_debugfs_file_t file, const uint8_t *buf,
-			 qdf_size_t len)
+			 qdf_size_t len, int rowsize, int groupsize)
 {
-	const size_t rowsize = 16;
-	const size_t groupsize = 4;
 	char *dst;
 	size_t dstlen, readlen;
 	int prefix = 0;
@@ -206,6 +205,11 @@ void qdf_debugfs_hexdump(qdf_debugfs_file_t file, const uint8_t *buf,
 
 #endif
 
+bool qdf_debugfs_overflow(qdf_debugfs_file_t file)
+{
+	return seq_has_overflowed(file);
+}
+
 void qdf_debugfs_write(qdf_debugfs_file_t file, const uint8_t *buf,
 		       qdf_size_t len)
 {