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Commit 548cefa5 authored by Vikram Mulukutla's avatar Vikram Mulukutla Committed by Gerrit - the friendly Code Review server
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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: I82d018a666db77a80d045213d0018474f219dcd5
Signed-off-by: default avatarVikram Mulukutla <markivx@codeaurora.org>
parent dec3acb0

arch/arm64/kernel/io.c

+9 −9
Original line number Diff line number Diff line
@@ -28,21 +28,21 @@ 
void __memcpy_fromio(void *to, const volatile void __iomem *from, size_t count)

{

	while (count && (!IO_CHECK_ALIGN(from, 8) || !IO_CHECK_ALIGN(to, 8))) {

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

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

		from++;

		to++;

		count--;

	}



	while (count >= 8) {

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

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

		from += 8;

		to += 8;

		count -= 8;

	}



	while (count) {

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

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

		from++;

		to++;

		count--;
@@ -60,21 +60,21 @@ void __memcpy_toio(volatile void __iomem *to, const void *from, size_t count) 


	__iowmb();

	while (count && (!IO_CHECK_ALIGN(p, 8) || !IO_CHECK_ALIGN(from, 8))) {

		writeb_relaxed(*(volatile u8 *)from, p);

		writeb_relaxed_no_log(*(volatile u8 *)from, p);

		from++;

		p++;

		count--;

	}



	while (count >= 8) {

		writeq_relaxed(*(volatile u64 *)from, p);

		writeq_relaxed_no_log(*(volatile u64 *)from, p);

		from += 8;

		p += 8;

		count -= 8;

	}



	while (count) {

		writeb_relaxed(*(volatile u8 *)from, p);

		writeb_relaxed_no_log(*(volatile u8 *)from, p);

		from++;

		p++;

		count--;
@@ -96,19 +96,19 @@ void __memset_io(volatile void __iomem *dst, int c, size_t count) 


	__iowmb();

	while (count && !IO_CHECK_ALIGN(p, 8)) {

		writeb_relaxed(c, p);

		writeb_relaxed_no_log(c, p);

		p++;

		count--;

	}



	while (count >= 8) {

		writeq_relaxed(c, p);

		writeq_relaxed_no_log(c, p);

		p += 8;

		count -= 8;

	}



	while (count) {

		writeb_relaxed(c, p);

		writeb_relaxed_no_log(c, p);

		p++;

		count--;

	}