Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc

* 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc:
  [POWERPC] Fix G5 DART (IOMMU) race causing occasional data corruption
  [POWERPC] Fix MMIO ops to provide expected barrier behaviour
  [POWERPC] Fix interrupt clearing in kdump shutdown sequence
  [POWERPC] update prep_defconfig
  [POWERPC] kdump: Support kernels having 64k page size.
  [POWERPC] Implement PowerPC futex_atomic_cmpxchg_inatomic().
  [POWERPC] Add new, missing argument to of_irq_map_raw() for 86xx.
  [POWERPC] Update defconfigs

6 files changed, 77 insertions, 17 deletions

diff --git a/include/asm-powerpc/eeh.h b/include/asm-powerpc/eeh.h
index 4df3e80118f..6a784396660 100644
--- a/include/asm-powerpc/eeh.h
+++ b/include/asm-powerpc/eeh.h
@@ -205,6 +205,7 @@ static inline void eeh_memset_io(volatile void __iomem *addr, int c,
 	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 @@ static inline void eeh_memcpy_fromio(void *dest, const volatile void __iomem *sr
 	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 @@ static inline void eeh_memcpy_toio(volatile void __iomem *dest, const void *src,
 {
 	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/futex.h b/include/asm-powerpc/futex.h
index f1b3c00bc1c..936422e5489 100644
--- a/include/asm-powerpc/futex.h
+++ b/include/asm-powerpc/futex.h
@@ -84,7 +84,33 @@ static inline int futex_atomic_op_inuser (int encoded_op, int __user *uaddr)
 static inline int
 futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)
 {
-	return -ENOSYS;
+	int prev;
+
+	if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))
+		return -EFAULT;
+
+        __asm__ __volatile__ (
+        LWSYNC_ON_SMP
+"1:     lwarx   %0,0,%2         # futex_atomic_cmpxchg_inatomic\n\
+        cmpw    0,%0,%3\n\
+        bne-    3f\n"
+        PPC405_ERR77(0,%2)
+"2:     stwcx.  %4,0,%2\n\
+        bne-    1b\n"
+        ISYNC_ON_SMP
+"3:	.section .fixup,\"ax\"\n\
+4:	li	%0,%5\n\
+	b	3b\n\
+	.previous\n\
+	.section __ex_table,\"a\"\n\
+	.align 3\n\
+	" PPC_LONG "1b,4b,2b,4b\n\
+	.previous" \
+        : "=&r" (prev), "+m" (*uaddr)
+        : "r" (uaddr), "r" (oldval), "r" (newval), "i" (-EFAULT)
+        : "cc", "memory");
+
+        return prev;
 }
 
 #endif /* __KERNEL__ */
diff --git a/include/asm-powerpc/io.h b/include/asm-powerpc/io.h
index 36c4c34bf56..212428db0d8 100644
--- a/include/asm-powerpc/io.h
+++ b/include/asm-powerpc/io.h
@@ -19,6 +19,7 @@ extern int check_legacy_ioport(unsigned long base_port);
 #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 _outsw_ns(volatile u16 __iomem *port, const void *buf, int ns);
 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 @@ static inline int in_8(const volatile unsigned char __iomem *addr)
 {
 	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 @@ static inline int in_be16(const volatile unsigned short __iomem *addr)
 {
 	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 @@ static inline unsigned in_be32(const volatile unsigned __iomem *addr)
 {
 	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 @@ static inline unsigned long in_le64(const volatile unsigned long __iomem *addr)
 	unsigned long tmp, ret;
 
 	__asm__ __volatile__(
+			     "sync\n"
 			     "ld %1,0(%2)\n"
 			     "twi 0,%1,0\n"
 			     "isync\n"
@@ -372,7 +383,7 @@ static inline unsigned long in_be64(const volatile unsigned long __iomem *addr)
 {
 	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 @@ static inline void out_le64(volatile unsigned long __iomem *addr, unsigned long
 			     "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/kdump.h b/include/asm-powerpc/kdump.h
index dc1574c945f..10e8eb1e6f4 100644
--- a/include/asm-powerpc/kdump.h
+++ b/include/asm-powerpc/kdump.h
@@ -7,7 +7,7 @@
 /* How many bytes to reserve at zero for kdump. The reserve limit should
  * be greater or equal to the trampoline's end address.
  * Reserve to the end of the FWNMI area, see head_64.S */
-#define KDUMP_RESERVE_LIMIT	0x8000
+#define KDUMP_RESERVE_LIMIT	0x10000 /* 64K */
 
 #ifdef CONFIG_CRASH_DUMP
 
diff --git a/include/asm-powerpc/paca.h b/include/asm-powerpc/paca.h
index 2d4585f0620..3d5d590bc4b 100644
--- a/include/asm-powerpc/paca.h
+++ b/include/asm-powerpc/paca.h
@@ -93,6 +93,7 @@ struct paca_struct {
 	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 895cb6d3a42..c31e4382a77 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 __inline__ unsigned long __spin_trylock(raw_spinlock_t *lock)
 
 static int __inline__ __raw_spin_trylock(raw_spinlock_t *lock)
 {
+	CLEAR_IO_SYNC;
 	return __spin_trylock(lock) == 0;
 }
 
@@ -91,6 +105,7 @@ extern void __rw_yield(raw_rwlock_t *lock);
 
 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 @@ static void __inline__ __raw_spin_lock_flags(raw_spinlock_t *lock, unsigned long
 {
 	unsigned long flags_dis;
 
+	CLEAR_IO_SYNC;
 	while (1) {
 		if (likely(__spin_trylock(lock) == 0))
 			break;
@@ -124,6 +140,7 @@ static void __inline__ __raw_spin_lock_flags(raw_spinlock_t *lock, unsigned long
 
 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;