alpha: fix memory barriers so that they conform to the specification

The commits cd0e00c10672 and 92d7223a7423 broke boot on the Alpha Avanti
platform. The patches move memory barriers after a write before the write.
The result is that if there's iowrite followed by ioread, there is no
barrier between them.

The Alpha architecture allows reordering of the accesses to the I/O space,
and the missing barrier between write and read causes hang with serial
port and real time clock.

This patch makes barriers confiorm to the specification.

1. We add mb() before readX_relaxed and writeX_relaxed -
   memory-barriers.txt claims that these functions must be ordered w.r.t.
   each other. Alpha doesn't order them, so we need an explicit barrier.
2. We add mb() before reads from the I/O space - so that if there's a
   write followed by a read, there should be a barrier between them.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Fixes: cd0e00c10672 ("alpha: io: reorder barriers to guarantee writeX() and iowriteX() ordering")
Fixes: 92d7223a7423 ("alpha: io: reorder barriers to guarantee writeX() and iowriteX() ordering #2")
Cc: stable@vger.kernel.org      # v4.17+
Acked-by: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Reviewed-by: Maciej W. Rozycki <macro@linux-mips.org>
Signed-off-by: Matt Turner <mattst88@gmail.com>

diff --git a/arch/alpha/include/asm/io.h b/arch/alpha/include/asm/io.h
index 13bea465f1c063d104ac52b436dd149a3d043fd9..a4d0c19f1e796aeda7b4ca03845ac3b2fa3fe48c 100644 (file)
--- a/arch/alpha/include/asm/io.h
+++ b/arch/alpha/include/asm/io.h
@@ -309,14 +309,18 @@ static inline int __is_mmio(const volatile void __iomem *addr)
 #if IO_CONCAT(__IO_PREFIX,trivial_io_bw)
 extern inline unsigned int ioread8(void __iomem *addr)
 {
-       unsigned int ret = IO_CONCAT(__IO_PREFIX,ioread8)(addr);
+       unsigned int ret;
+       mb();
+       ret = IO_CONCAT(__IO_PREFIX,ioread8)(addr);
        mb();
        return ret;
 }
 
 extern inline unsigned int ioread16(void __iomem *addr)
 {
-       unsigned int ret = IO_CONCAT(__IO_PREFIX,ioread16)(addr);
+       unsigned int ret;
+       mb();
+       ret = IO_CONCAT(__IO_PREFIX,ioread16)(addr);
        mb();
        return ret;
 }
@@ -357,7 +361,9 @@ extern inline void outw(u16 b, unsigned long port)
 #if IO_CONCAT(__IO_PREFIX,trivial_io_lq)
 extern inline unsigned int ioread32(void __iomem *addr)
 {
-       unsigned int ret = IO_CONCAT(__IO_PREFIX,ioread32)(addr);
+       unsigned int ret;
+       mb();
+       ret = IO_CONCAT(__IO_PREFIX,ioread32)(addr);
        mb();
        return ret;
 }
@@ -402,14 +408,18 @@ extern inline void __raw_writew(u16 b, volatile void __iomem *addr)
 
 extern inline u8 readb(const volatile void __iomem *addr)
 {
-       u8 ret = __raw_readb(addr);
+       u8 ret;
+       mb();
+       ret = __raw_readb(addr);
        mb();
        return ret;
 }
 
 extern inline u16 readw(const volatile void __iomem *addr)
 {
-       u16 ret = __raw_readw(addr);
+       u16 ret;
+       mb();
+       ret = __raw_readw(addr);
        mb();
        return ret;
 }
@@ -450,14 +460,18 @@ extern inline void __raw_writeq(u64 b, volatile void __iomem *addr)
 
 extern inline u32 readl(const volatile void __iomem *addr)
 {
-       u32 ret = __raw_readl(addr);
+       u32 ret;
+       mb();
+       ret = __raw_readl(addr);
        mb();
        return ret;
 }
 
 extern inline u64 readq(const volatile void __iomem *addr)
 {
-       u64 ret = __raw_readq(addr);
+       u64 ret;
+       mb();
+       ret = __raw_readq(addr);
        mb();
        return ret;
 }
@@ -486,14 +500,44 @@ extern inline void writeq(u64 b, volatile void __iomem *addr)
 #define outb_p         outb
 #define outw_p         outw
 #define outl_p         outl
-#define readb_relaxed(addr)    __raw_readb(addr)
-#define readw_relaxed(addr)    __raw_readw(addr)
-#define readl_relaxed(addr)    __raw_readl(addr)
-#define readq_relaxed(addr)    __raw_readq(addr)
-#define writeb_relaxed(b, addr)        __raw_writeb(b, addr)
-#define writew_relaxed(b, addr)        __raw_writew(b, addr)
-#define writel_relaxed(b, addr)        __raw_writel(b, addr)
-#define writeq_relaxed(b, addr)        __raw_writeq(b, addr)
+
+extern u8 readb_relaxed(const volatile void __iomem *addr);
+extern u16 readw_relaxed(const volatile void __iomem *addr);
+extern u32 readl_relaxed(const volatile void __iomem *addr);
+extern u64 readq_relaxed(const volatile void __iomem *addr);
+
+#if IO_CONCAT(__IO_PREFIX,trivial_io_bw)
+extern inline u8 readb_relaxed(const volatile void __iomem *addr)
+{
+       mb();
+       return __raw_readb(addr);
+}
+
+extern inline u16 readw_relaxed(const volatile void __iomem *addr)
+{
+       mb();
+       return __raw_readw(addr);
+}
+#endif
+
+#if IO_CONCAT(__IO_PREFIX,trivial_io_lq)
+extern inline u32 readl_relaxed(const volatile void __iomem *addr)
+{
+       mb();
+       return __raw_readl(addr);
+}
+
+extern inline u64 readq_relaxed(const volatile void __iomem *addr)
+{
+       mb();
+       return __raw_readq(addr);
+}
+#endif
+
+#define writeb_relaxed writeb
+#define writew_relaxed writew
+#define writel_relaxed writel
+#define writeq_relaxed writeq
 
 /*
  * String version of IO memory access ops:

diff --git a/arch/alpha/kernel/io.c b/arch/alpha/kernel/io.c
index c025a3e5e3578beb3ecaa521333e3b1d97e98760..938de13adfbfe44233118d31613e5a293dde387d 100644 (file)
--- a/arch/alpha/kernel/io.c
+++ b/arch/alpha/kernel/io.c
@@ -16,21 +16,27 @@
 unsigned int
 ioread8(void __iomem *addr)
 {
-       unsigned int ret = IO_CONCAT(__IO_PREFIX,ioread8)(addr);
+       unsigned int ret;
+       mb();
+       ret = IO_CONCAT(__IO_PREFIX,ioread8)(addr);
        mb();
        return ret;
 }
 
 unsigned int ioread16(void __iomem *addr)
 {
-       unsigned int ret = IO_CONCAT(__IO_PREFIX,ioread16)(addr);
+       unsigned int ret;
+       mb();
+       ret = IO_CONCAT(__IO_PREFIX,ioread16)(addr);
        mb();
        return ret;
 }
 
 unsigned int ioread32(void __iomem *addr)
 {
-       unsigned int ret = IO_CONCAT(__IO_PREFIX,ioread32)(addr);
+       unsigned int ret;
+       mb();
+       ret = IO_CONCAT(__IO_PREFIX,ioread32)(addr);
        mb();
        return ret;
 }
@@ -148,28 +154,36 @@ EXPORT_SYMBOL(__raw_writeq);
 
 u8 readb(const volatile void __iomem *addr)
 {
-       u8 ret = __raw_readb(addr);
+       u8 ret;
+       mb();
+       ret = __raw_readb(addr);
        mb();
        return ret;
 }
 
 u16 readw(const volatile void __iomem *addr)
 {
-       u16 ret = __raw_readw(addr);
+       u16 ret;
+       mb();
+       ret = __raw_readw(addr);
        mb();
        return ret;
 }
 
 u32 readl(const volatile void __iomem *addr)
 {
-       u32 ret = __raw_readl(addr);
+       u32 ret;
+       mb();
+       ret = __raw_readl(addr);
        mb();
        return ret;
 }
 
 u64 readq(const volatile void __iomem *addr)
 {
-       u64 ret = __raw_readq(addr);
+       u64 ret;
+       mb();
+       ret = __raw_readq(addr);
        mb();
        return ret;
 }
@@ -207,6 +221,38 @@ EXPORT_SYMBOL(writew);
 EXPORT_SYMBOL(writel);
 EXPORT_SYMBOL(writeq);
 
+/*
+ * The _relaxed functions must be ordered w.r.t. each other, but they don't
+ * have to be ordered w.r.t. other memory accesses.
+ */
+u8 readb_relaxed(const volatile void __iomem *addr)
+{
+       mb();
+       return __raw_readb(addr);
+}
+
+u16 readw_relaxed(const volatile void __iomem *addr)
+{
+       mb();
+       return __raw_readw(addr);
+}
+
+u32 readl_relaxed(const volatile void __iomem *addr)
+{
+       mb();
+       return __raw_readl(addr);
+}
+
+u64 readq_relaxed(const volatile void __iomem *addr)
+{
+       mb();
+       return __raw_readq(addr);
+}
+
+EXPORT_SYMBOL(readb_relaxed);
+EXPORT_SYMBOL(readw_relaxed);
+EXPORT_SYMBOL(readl_relaxed);
+EXPORT_SYMBOL(readq_relaxed);
 
 /*
  * Read COUNT 8-bit bytes from port PORT into memory starting at SRC.