[PATCH] powerpc: merge atomic.h, memory.h

powerpc: Merge atomic.h and memory.h into powerpc

Merged atomic.h into include/powerpc.  Moved asm-style HMT_ defines from
memory.h into ppc_asm.h, where there were already HMT_defines; moved c-style
HMT_ defines to processor.h. Renamed memory.h to synch.h to better reflect
its contents.

Signed-off-by: Kumar Gala <kumar.gala@freescale.com>
Signed-off-by: Becky Bruce <becky.bruce@freescale.com>
Signed-off-by: Jon Loeliger <linuxppc@jdl.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

include/asm-ppc/atomic.h → include/asm-powerpc/atomic.h

@@ -1,29 +1,20 @@
+#ifndef _ASM_POWERPC_ATOMIC_H_
+#define _ASM_POWERPC_ATOMIC_H_
+
 /*
  * PowerPC atomic operations
  */
 
-#ifndef _ASM_PPC_ATOMIC_H_
-#define _ASM_PPC_ATOMIC_H_
-
 typedef struct { volatile int counter; } atomic_t;
 
 #ifdef __KERNEL__
+#include <asm/synch.h>
 
-#define ATOMIC_INIT(i)	{ (i) }
+#define ATOMIC_INIT(i)		{ (i) }
 
 #define atomic_read(v)		((v)->counter)
 #define atomic_set(v,i)		(((v)->counter) = (i))
 
-extern void atomic_clear_mask(unsigned long mask, unsigned long *addr);
-
-#ifdef CONFIG_SMP
-#define SMP_SYNC	"sync"
-#define SMP_ISYNC	"\n\tisync"
-#else
-#define SMP_SYNC	""
-#define SMP_ISYNC
-#endif
-
 /* Erratum #77 on the 405 means we need a sync or dcbt before every stwcx.
  * The old ATOMIC_SYNC_FIX covered some but not all of this.
  */
@@ -53,12 +44,13 @@ static __inline__ int atomic_add_return(int a, atomic_t *v)
 	int t;
 
 	__asm__ __volatile__(
+	EIEIO_ON_SMP
 "1:	lwarx	%0,0,%2		# atomic_add_return\n\
 	add	%0,%1,%0\n"
 	PPC405_ERR77(0,%2)
 "	stwcx.	%0,0,%2 \n\
 	bne-	1b"
-	SMP_ISYNC
+	ISYNC_ON_SMP
 	: "=&r" (t)
 	: "r" (a), "r" (&v->counter)
 	: "cc", "memory");
@@ -88,12 +80,13 @@ static __inline__ int atomic_sub_return(int a, atomic_t *v)
 	int t;
 
 	__asm__ __volatile__(
+	EIEIO_ON_SMP
 "1:	lwarx	%0,0,%2		# atomic_sub_return\n\
 	subf	%0,%1,%0\n"
 	PPC405_ERR77(0,%2)
 "	stwcx.	%0,0,%2 \n\
 	bne-	1b"
-	SMP_ISYNC
+	ISYNC_ON_SMP
 	: "=&r" (t)
 	: "r" (a), "r" (&v->counter)
 	: "cc", "memory");
@@ -121,12 +114,13 @@ static __inline__ int atomic_inc_return(atomic_t *v)
 	int t;
 
 	__asm__ __volatile__(
+	EIEIO_ON_SMP
 "1:	lwarx	%0,0,%1		# atomic_inc_return\n\
 	addic	%0,%0,1\n"
 	PPC405_ERR77(0,%1)
 "	stwcx.	%0,0,%1 \n\
 	bne-	1b"
-	SMP_ISYNC
+	ISYNC_ON_SMP
 	: "=&r" (t)
 	: "r" (&v->counter)
 	: "cc", "memory");
@@ -164,12 +158,13 @@ static __inline__ int atomic_dec_return(atomic_t *v)
 	int t;
 
 	__asm__ __volatile__(
+	EIEIO_ON_SMP
 "1:	lwarx	%0,0,%1		# atomic_dec_return\n\
 	addic	%0,%0,-1\n"
 	PPC405_ERR77(0,%1)
 "	stwcx.	%0,0,%1\n\
 	bne-	1b"
-	SMP_ISYNC
+	ISYNC_ON_SMP
 	: "=&r" (t)
 	: "r" (&v->counter)
 	: "cc", "memory");
@@ -189,13 +184,14 @@ static __inline__ int atomic_dec_if_positive(atomic_t *v)
 	int t;
 
 	__asm__ __volatile__(
+	EIEIO_ON_SMP
 "1:	lwarx	%0,0,%1		# atomic_dec_if_positive\n\
 	addic.	%0,%0,-1\n\
 	blt-	2f\n"
 	PPC405_ERR77(0,%1)
 "	stwcx.	%0,0,%1\n\
 	bne-	1b"
-	SMP_ISYNC
+	ISYNC_ON_SMP
 	"\n\
 2:"	: "=&r" (t)
 	: "r" (&v->counter)
@@ -204,11 +200,10 @@ static __inline__ int atomic_dec_if_positive(atomic_t *v)
 	return t;
 }
 
-#define __MB	__asm__ __volatile__ (SMP_SYNC : : : "memory")
-#define smp_mb__before_atomic_dec()	__MB
-#define smp_mb__after_atomic_dec()	__MB
-#define smp_mb__before_atomic_inc()	__MB
-#define smp_mb__after_atomic_inc()	__MB
+#define smp_mb__before_atomic_dec()     smp_mb()
+#define smp_mb__after_atomic_dec()      smp_mb()
+#define smp_mb__before_atomic_inc()     smp_mb()
+#define smp_mb__after_atomic_inc()      smp_mb()
 
 #endif /* __KERNEL__ */
-#endif /* _ASM_PPC_ATOMIC_H_ */
+#endif /* _ASM_POWERPC_ATOMIC_H_ */

include/asm-powerpc/ppc_asm.h

@@ -75,8 +75,11 @@
 #define REST_32EVRS(n,s,base)	REST_16EVRS(n,s,base); REST_16EVRS(n+16,s,base)
 
 /* Macros to adjust thread priority for Iseries hardware multithreading */
+#define HMT_VERY_LOW    or   31,31,31	# very low priority\n"
 #define HMT_LOW		or 1,1,1
+#define HMT_MEDIUM_LOW  or   6,6,6	# medium low priority\n"
 #define HMT_MEDIUM	or 2,2,2
+#define HMT_MEDIUM_HIGH or   5,5,5	# medium high priority\n"
 #define HMT_HIGH	or 3,3,3
 
 /* handle instructions that older assemblers may not know */

include/asm-powerpc/synch.h

@@ -0,0 +1,51 @@
+#ifndef _ASM_POWERPC_SYNCH_H 
+#define _ASM_POWERPC_SYNCH_H 
+
+#include <linux/config.h>
+
+#ifdef __powerpc64__
+#define __SUBARCH_HAS_LWSYNC
+#endif
+
+#ifdef __SUBARCH_HAS_LWSYNC
+#    define LWSYNC	lwsync
+#else
+#    define LWSYNC	sync
+#endif
+
+
+/*
+ * Arguably the bitops and *xchg operations don't imply any memory barrier
+ * or SMP ordering, but in fact a lot of drivers expect them to imply
+ * both, since they do on x86 cpus.
+ */
+#ifdef CONFIG_SMP
+#define EIEIO_ON_SMP	"eieio\n"
+#define ISYNC_ON_SMP	"\n\tisync"
+#define SYNC_ON_SMP	__stringify(LWSYNC) "\n"
+#else
+#define EIEIO_ON_SMP
+#define ISYNC_ON_SMP
+#define SYNC_ON_SMP
+#endif
+
+static inline void eieio(void)
+{
+	__asm__ __volatile__ ("eieio" : : : "memory");
+}
+
+static inline void isync(void)
+{
+	__asm__ __volatile__ ("isync" : : : "memory");
+}
+
+#ifdef CONFIG_SMP
+#define eieio_on_smp()	eieio()
+#define isync_on_smp()	isync()
+#else
+#define eieio_on_smp()	__asm__ __volatile__("": : :"memory")
+#define isync_on_smp()	__asm__ __volatile__("": : :"memory")
+#endif
+
+#endif	/* _ASM_POWERPC_SYNCH_H */
+

include/asm-ppc/io.h

@@ -8,6 +8,7 @@
 
 #include <asm/page.h>
 #include <asm/byteorder.h>
+#include <asm/synch.h>
 #include <asm/mmu.h>
 
 #define SIO_CONFIG_RA	0x398
@@ -440,16 +441,6 @@ extern inline void * phys_to_virt(unsigned long address)
 #define page_to_phys(page)	(page_to_pfn(page) << PAGE_SHIFT)
 #define page_to_bus(page)	(page_to_phys(page) + PCI_DRAM_OFFSET)
 
-/*
- * Enforce In-order Execution of I/O:
- * Acts as a barrier to ensure all previous I/O accesses have
- * completed before any further ones are issued.
- */
-extern inline void eieio(void)
-{
-	__asm__ __volatile__ ("eieio" : : : "memory");
-}
-
 /* Enforce in-order execution of data I/O.
  * No distinction between read/write on PPC; use eieio for all three.
  */