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Commit d6e51719 authored by Trilok Soni's avatar Trilok Soni Committed by Kyle Yan
Browse files

arm64: Prevent msm-rtb tracing in memcpy_{from,to}io and memset_io 



Use the no-log variants of the read{b,q,l}/write{b,q,l} APIs
to prevent flooding the MSM register trace buffer (RTB) logs
with memcpy/memset induced logging.

Change-Id: I16556e1d6f4abe00e6f33b8375a5a1839dfca34e
Signed-off-by: default avatarTrilok Soni <tsoni@codeaurora.org>
parent 974132c3

arch/arm64/kernel/io.c

+9 −9
Original line number Diff line number Diff line
@@ -27,21 +27,21 @@ void __memcpy_fromio(void *to, const volatile void __iomem *from, size_t count) 
{

	while (count && (!IS_ALIGNED((unsigned long)from, 8) ||

			 !IS_ALIGNED((unsigned long)to, 8))) {

		*(u8 *)to = __raw_readb(from);

		*(u8 *)to = __raw_readb_no_log(from);

		from++;

		to++;

		count--;

	}



	while (count >= 8) {

		*(u64 *)to = __raw_readq(from);

		*(u64 *)to = __raw_readq_no_log(from);

		from += 8;

		to += 8;

		count -= 8;

	}



	while (count) {

		*(u8 *)to = __raw_readb(from);

		*(u8 *)to = __raw_readb_no_log(from);

		from++;

		to++;

		count--;
@@ -56,21 +56,21 @@ void __memcpy_toio(volatile void __iomem *to, const void *from, size_t count) 
{

	while (count && (!IS_ALIGNED((unsigned long)to, 8) ||

			 !IS_ALIGNED((unsigned long)from, 8))) {

		__raw_writeb(*(volatile u8 *)from, to);

		__raw_writeb_no_log(*(volatile u8 *)from, to);

		from++;

		to++;

		count--;

	}



	while (count >= 8) {

		__raw_writeq(*(volatile u64 *)from, to);

		__raw_writeq_no_log(*(volatile u64 *)from, to);

		from += 8;

		to += 8;

		count -= 8;

	}



	while (count) {

		__raw_writeb(*(volatile u8 *)from, to);

		__raw_writeb_no_log(*(volatile u8 *)from, to);

		from++;

		to++;

		count--;
@@ -90,19 +90,19 @@ void __memset_io(volatile void __iomem *dst, int c, size_t count) 
	qc |= qc << 32;



	while (count && !IS_ALIGNED((unsigned long)dst, 8)) {

		__raw_writeb(c, dst);

		__raw_writeb_no_log(c, dst);

		dst++;

		count--;

	}



	while (count >= 8) {

		__raw_writeq(qc, dst);

		__raw_writeq_no_log(qc, dst);

		dst += 8;

		count -= 8;

	}



	while (count) {

		__raw_writeb(c, dst);

		__raw_writeb_no_log(c, dst);

		dst++;

		count--;

	}