Add register read/write operations tracing support.
ftrace events helps trace register read and write
location details of memory mapped IO registers. Also
add _no_log variants the writel_relaxed/readl_relaed
APIs to avoid excessive logging for certain register
operations.

Signed-off-by: Prasad Sodagudi <redacted>
---
 arch/arm64/include/asm/io.h    | 117 ++++++++++++++++++++++++++++++++++++++---
 include/linux/iorw.h           |  20 +++++++
 include/trace/events/rwio.h    |  51 ++++++++++++++++++
 kernel/trace/Kconfig           |  11 ++++
 kernel/trace/Makefile          |   1 +
 kernel/trace/trace_readwrite.c |  30 +++++++++++
 6 files changed, 222 insertions(+), 8 deletions(-)
 create mode 100644 include/linux/iorw.h
 create mode 100644 include/trace/events/rwio.h
 create mode 100644 kernel/trace/trace_readwrite.c

diff --git a/arch/arm64/include/asm/io.h b/arch/arm64/include/asm/io.h
index ff50dd7..db5acff 100644
--- a/arch/arm64/include/asm/io.h
+++ b/arch/arm64/include/asm/io.h

@@ -9,6 +9,7 @@
 #define __ASM_IO_H
 
 #include <linux/types.h>
+#include <linux/iorw.h>
 #include <linux/pgtable.h>
 
 #include <asm/byteorder.h>

@@ -24,24 +25,28 @@
 #define __raw_writeb __raw_writeb
 static inline void __raw_writeb(u8 val, volatile void __iomem *addr)
 {
+	log_write_io(addr);
 	asm volatile("strb %w0, [%1]" : : "rZ" (val), "r" (addr));