coresight: etm4x: Use asm-generic IO memory barriers

Per discussion in [1], it was decided to move to using architecture
independent/asm-generic IO memory barriers to have just one set of
them and deprecate use of arm64 specific IO memory barriers in driver
code. So replace current usage of __io_rmb()/__iowmb() in drivers to
__io_ar()/__io_bw().

[1] https://lore.kernel.org/lkml/CAK8P3a0L2tLeF1Q0+0ijUxhGNaw+Z0fyPC1oW6_ELQfn0=i4iw@mail.gmail.com/

Signed-off-by: Sai Prakash Ranjan <quic_saipraka@quicinc.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

Author: Sai Prakash Ranjan

drivers/hwtracing/coresight/coresight-etm4x-core.c

@@ -98,15 +98,15 @@ u64 etm4x_sysreg_read(u32 offset, bool _relaxed, bool _64bit)
 	}
 
 	if (!_relaxed)
-		__iormb(res);	/* Imitate the !relaxed I/O helpers */
+		__io_ar(res);	/* Imitate the !relaxed I/O helpers */
 
 	return res;
 }
 
 void etm4x_sysreg_write(u64 val, u32 offset, bool _relaxed, bool _64bit)
 {
 	if (!_relaxed)
-		__iowmb();	/* Imitate the !relaxed I/O helpers */
+		__io_bw();	/* Imitate the !relaxed I/O helpers */
 	if (!_64bit)
 		val &= GENMASK(31, 0);
 
@@ -130,15 +130,15 @@ static u64 ete_sysreg_read(u32 offset, bool _relaxed, bool _64bit)
 	}
 
 	if (!_relaxed)
-		__iormb(res);	/* Imitate the !relaxed I/O helpers */
+		__io_ar(res);	/* Imitate the !relaxed I/O helpers */
 
 	return res;
 }
 
 static void ete_sysreg_write(u64 val, u32 offset, bool _relaxed, bool _64bit)
 {
 	if (!_relaxed)
-		__iowmb();	/* Imitate the !relaxed I/O helpers */
+		__io_bw();	/* Imitate the !relaxed I/O helpers */
 	if (!_64bit)
 		val &= GENMASK(31, 0);
 

drivers/hwtracing/coresight/coresight-etm4x.h

@@ -546,14 +546,14 @@
 #define etm4x_read32(csa, offset)					\
 	({								\
 		u32 __val = etm4x_relaxed_read32((csa), (offset));	\
-		__iormb(__val);						\
+		__io_ar(__val);						\
 		__val;							\
 	 })
 
 #define etm4x_read64(csa, offset)					\
 	({								\
 		u64 __val = etm4x_relaxed_read64((csa), (offset));	\
-		__iormb(__val);						\
+		__io_ar(__val);						\
 		__val;							\
 	 })
 
@@ -577,13 +577,13 @@
 
 #define etm4x_write32(csa, val, offset)					\
 	do {								\
-		__iowmb();						\
+		__io_bw();						\
 		etm4x_relaxed_write32((csa), (val), (offset));		\
 	} while (0)
 
 #define etm4x_write64(csa, val, offset)					\
 	do {								\
-		__iowmb();						\
+		__io_bw();						\
 		etm4x_relaxed_write64((csa), (val), (offset));		\
 	} while (0)