[POWERPC] Fix MMIO ops to provide expected barrier behaviour
This changes the writeX family of functions to have a sync instruction
before the MMIO store rather than after, because the generally expected
behaviour is that the device receiving the MMIO store can be guaranteed
to see the effects of any preceding writes to normal memory.
To preserve ordering between writeX and readX, and to preserve ordering
between preceding stores and the readX, the readX family of functions
have had an sync added before the load.
Although writeX followed by spin_unlock is not officially guaranteed
to keep the writeX inside the spin-locked region unless an mmiowb()
is used, there are currently drivers that depend on the previous
behaviour on powerpc, which was that the mmiowb wasn't actually required.
Therefore we have a per-cpu flag that is set by writeX, cleared by
__raw_spin_lock and mmiowb, and tested by __raw_spin_unlock. If it is
set, __raw_spin_unlock does a sync and clears it.
This changes both 32-bit and 64-bit readX/writeX. 32-bit already has a
sync in __raw_spin_unlock (since lwsync doesn't exist on 32-bit), and thus
doesn't need the per-cpu flag.
Tested on G5 (PPC970) and POWER5.
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/include/asm-powerpc/eeh.h b/include/asm-powerpc/eeh.h
index 4df3e80..6a78439 100644
--- a/include/asm-powerpc/eeh.h
+++ b/include/asm-powerpc/eeh.h
@@ -205,6 +205,7 @@
lc |= lc << 8;
lc |= lc << 16;
+ __asm__ __volatile__ ("sync" : : : "memory");
while(n && !EEH_CHECK_ALIGN(p, 4)) {
*((volatile u8 *)p) = c;
p++;
@@ -229,6 +230,7 @@
void *destsave = dest;
unsigned long nsave = n;
+ __asm__ __volatile__ ("sync" : : : "memory");
while(n && (!EEH_CHECK_ALIGN(vsrc, 4) || !EEH_CHECK_ALIGN(dest, 4))) {
*((u8 *)dest) = *((volatile u8 *)vsrc);
__asm__ __volatile__ ("eieio" : : : "memory");
@@ -266,6 +268,7 @@
{
void *vdest = (void __force *) dest;
+ __asm__ __volatile__ ("sync" : : : "memory");
while(n && (!EEH_CHECK_ALIGN(vdest, 4) || !EEH_CHECK_ALIGN(src, 4))) {
*((volatile u8 *)vdest) = *((u8 *)src);
src++;
diff --git a/include/asm-powerpc/io.h b/include/asm-powerpc/io.h
index 36c4c34..212428d 100644
--- a/include/asm-powerpc/io.h
+++ b/include/asm-powerpc/io.h
@@ -19,6 +19,7 @@
#include <linux/compiler.h>
#include <asm/page.h>
#include <asm/byteorder.h>
+#include <asm/paca.h>
#ifdef CONFIG_PPC_ISERIES
#include <asm/iseries/iseries_io.h>
#endif
@@ -162,7 +163,11 @@
extern void _insl_ns(volatile u32 __iomem *port, void *buf, int nl);
extern void _outsl_ns(volatile u32 __iomem *port, const void *buf, int nl);
-#define mmiowb()
+static inline void mmiowb(void)
+{
+ __asm__ __volatile__ ("sync" : : : "memory");
+ get_paca()->io_sync = 0;
+}
/*
* output pause versions need a delay at least for the
@@ -278,22 +283,23 @@
{
int ret;
- __asm__ __volatile__("lbz%U1%X1 %0,%1; twi 0,%0,0; isync"
+ __asm__ __volatile__("sync; lbz%U1%X1 %0,%1; twi 0,%0,0; isync"
: "=r" (ret) : "m" (*addr));
return ret;
}
static inline void out_8(volatile unsigned char __iomem *addr, int val)
{
- __asm__ __volatile__("stb%U0%X0 %1,%0; sync"
+ __asm__ __volatile__("sync; stb%U0%X0 %1,%0"
: "=m" (*addr) : "r" (val));
+ get_paca()->io_sync = 1;
}
static inline int in_le16(const volatile unsigned short __iomem *addr)
{
int ret;
- __asm__ __volatile__("lhbrx %0,0,%1; twi 0,%0,0; isync"
+ __asm__ __volatile__("sync; lhbrx %0,0,%1; twi 0,%0,0; isync"
: "=r" (ret) : "r" (addr), "m" (*addr));
return ret;
}
@@ -302,28 +308,30 @@
{
int ret;
- __asm__ __volatile__("lhz%U1%X1 %0,%1; twi 0,%0,0; isync"
+ __asm__ __volatile__("sync; lhz%U1%X1 %0,%1; twi 0,%0,0; isync"
: "=r" (ret) : "m" (*addr));
return ret;
}
static inline void out_le16(volatile unsigned short __iomem *addr, int val)
{
- __asm__ __volatile__("sthbrx %1,0,%2; sync"
+ __asm__ __volatile__("sync; sthbrx %1,0,%2"
: "=m" (*addr) : "r" (val), "r" (addr));
+ get_paca()->io_sync = 1;
}
static inline void out_be16(volatile unsigned short __iomem *addr, int val)
{
- __asm__ __volatile__("sth%U0%X0 %1,%0; sync"
+ __asm__ __volatile__("sync; sth%U0%X0 %1,%0"
: "=m" (*addr) : "r" (val));
+ get_paca()->io_sync = 1;
}
static inline unsigned in_le32(const volatile unsigned __iomem *addr)
{
unsigned ret;
- __asm__ __volatile__("lwbrx %0,0,%1; twi 0,%0,0; isync"
+ __asm__ __volatile__("sync; lwbrx %0,0,%1; twi 0,%0,0; isync"
: "=r" (ret) : "r" (addr), "m" (*addr));
return ret;
}
@@ -332,21 +340,23 @@
{
unsigned ret;
- __asm__ __volatile__("lwz%U1%X1 %0,%1; twi 0,%0,0; isync"
+ __asm__ __volatile__("sync; lwz%U1%X1 %0,%1; twi 0,%0,0; isync"
: "=r" (ret) : "m" (*addr));
return ret;
}
static inline void out_le32(volatile unsigned __iomem *addr, int val)
{
- __asm__ __volatile__("stwbrx %1,0,%2; sync" : "=m" (*addr)
+ __asm__ __volatile__("sync; stwbrx %1,0,%2" : "=m" (*addr)
: "r" (val), "r" (addr));
+ get_paca()->io_sync = 1;
}
static inline void out_be32(volatile unsigned __iomem *addr, int val)
{
- __asm__ __volatile__("stw%U0%X0 %1,%0; sync"
+ __asm__ __volatile__("sync; stw%U0%X0 %1,%0"
: "=m" (*addr) : "r" (val));
+ get_paca()->io_sync = 1;
}
static inline unsigned long in_le64(const volatile unsigned long __iomem *addr)
@@ -354,6 +364,7 @@
unsigned long tmp, ret;
__asm__ __volatile__(
+ "sync\n"
"ld %1,0(%2)\n"
"twi 0,%1,0\n"
"isync\n"
@@ -372,7 +383,7 @@
{
unsigned long ret;
- __asm__ __volatile__("ld%U1%X1 %0,%1; twi 0,%0,0; isync"
+ __asm__ __volatile__("sync; ld%U1%X1 %0,%1; twi 0,%0,0; isync"
: "=r" (ret) : "m" (*addr));
return ret;
}
@@ -389,14 +400,16 @@
"rldicl %1,%1,32,0\n"
"rlwimi %0,%1,8,8,31\n"
"rlwimi %0,%1,24,16,23\n"
- "std %0,0(%3)\n"
- "sync"
+ "sync\n"
+ "std %0,0(%3)"
: "=&r" (tmp) , "=&r" (val) : "1" (val) , "b" (addr) , "m" (*addr));
+ get_paca()->io_sync = 1;
}
static inline void out_be64(volatile unsigned long __iomem *addr, unsigned long val)
{
- __asm__ __volatile__("std%U0%X0 %1,%0; sync" : "=m" (*addr) : "r" (val));
+ __asm__ __volatile__("sync; std%U0%X0 %1,%0" : "=m" (*addr) : "r" (val));
+ get_paca()->io_sync = 1;
}
#ifndef CONFIG_PPC_ISERIES
diff --git a/include/asm-powerpc/paca.h b/include/asm-powerpc/paca.h
index 2d4585f..3d5d590 100644
--- a/include/asm-powerpc/paca.h
+++ b/include/asm-powerpc/paca.h
@@ -93,6 +93,7 @@
u64 saved_r1; /* r1 save for RTAS calls */
u64 saved_msr; /* MSR saved here by enter_rtas */
u8 proc_enabled; /* irq soft-enable flag */
+ u8 io_sync; /* writel() needs spin_unlock sync */
/* Stuff for accurate time accounting */
u64 user_time; /* accumulated usermode TB ticks */
diff --git a/include/asm-powerpc/spinlock.h b/include/asm-powerpc/spinlock.h
index 895cb6d..c31e438 100644
--- a/include/asm-powerpc/spinlock.h
+++ b/include/asm-powerpc/spinlock.h
@@ -36,6 +36,19 @@
#define LOCK_TOKEN 1
#endif
+#if defined(CONFIG_PPC64) && defined(CONFIG_SMP)
+#define CLEAR_IO_SYNC (get_paca()->io_sync = 0)
+#define SYNC_IO do { \
+ if (unlikely(get_paca()->io_sync)) { \
+ mb(); \
+ get_paca()->io_sync = 0; \
+ } \
+ } while (0)
+#else
+#define CLEAR_IO_SYNC
+#define SYNC_IO
+#endif
+
/*
* This returns the old value in the lock, so we succeeded
* in getting the lock if the return value is 0.
@@ -61,6 +74,7 @@
static int __inline__ __raw_spin_trylock(raw_spinlock_t *lock)
{
+ CLEAR_IO_SYNC;
return __spin_trylock(lock) == 0;
}
@@ -91,6 +105,7 @@
static void __inline__ __raw_spin_lock(raw_spinlock_t *lock)
{
+ CLEAR_IO_SYNC;
while (1) {
if (likely(__spin_trylock(lock) == 0))
break;
@@ -107,6 +122,7 @@
{
unsigned long flags_dis;
+ CLEAR_IO_SYNC;
while (1) {
if (likely(__spin_trylock(lock) == 0))
break;
@@ -124,6 +140,7 @@
static __inline__ void __raw_spin_unlock(raw_spinlock_t *lock)
{
+ SYNC_IO;
__asm__ __volatile__("# __raw_spin_unlock\n\t"
LWSYNC_ON_SMP: : :"memory");
lock->slock = 0;