linux-kernel - [PATCH v3 5/5] io: change inX() to have their own IO barrier overrides

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Date:   Wed,  4 Apr 2018 19:58:20 -0400
From:   Sinan Kaya <okaya@...eaurora.org>
To:     arnd@...db.de, timur@...eaurora.org, sulrich@...eaurora.org
Cc:     linux-arm-msm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Sinan Kaya <okaya@...eaurora.org>, linux-arch@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v3 5/5] io: change inX() to have their own IO barrier overrides

Open code readX() inside inX() so that inX() variants have their own
overrideable Port IO barrier combinations as __io_pbr() and __io_par() for
actions to be taken before port IO and after port IO read.

Signed-off-by: Sinan Kaya <okaya@...eaurora.org>
---
 include/asm-generic/io.h | 21 ++++++++++++++++++---
 1 file changed, 18 insertions(+), 3 deletions(-)

diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h
index 38a96d1..da51092 100644
--- a/include/asm-generic/io.h
+++ b/include/asm-generic/io.h
@@ -432,7 +432,12 @@ static inline void writesq(volatile void __iomem *addr, const void *buffer,
 #define inb inb
 static inline u8 inb(unsigned long addr)
 {
-	return readb(PCI_IOBASE + addr);
+	u8 val;
+
+	__io_pbr();
+	val = __raw_readb(PCI_IOBASE + addr);
+	__io_par();
+	return val;
 }
 #endif
 
@@ -440,7 +445,12 @@ static inline u8 inb(unsigned long addr)
 #define inw inw
 static inline u16 inw(unsigned long addr)
 {
-	return readw(PCI_IOBASE + addr);
+	u16 val;
+
+	__io_pbr();
+	val = __le16_to_cpu(__raw_readw(PCI_IOBASE + addr));
+	__io_par();
+	return val;
 }
 #endif
 
@@ -448,7 +458,12 @@ static inline u16 inw(unsigned long addr)
 #define inl inl
 static inline u32 inl(unsigned long addr)
 {
-	return readl(PCI_IOBASE + addr);
+	u32 val;
+
+	__io_pbr();
+	val = __le32_to_cpu(__raw_readl(PCI_IOBASE + addr));
+	__io_par();
+	return val;
 }
 #endif
 
-- 
2.7.4