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authorLinus Torvalds <torvalds@g5.osdl.org>2005-07-26 15:12:54 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2005-07-26 15:12:54 -0700
commit0983f0509480f95584f8e945e5b9c5310e9038f3 (patch)
tree099892d76ebaa20e7b59606196dcdb67155a3b03 /include/asm-arm
parentdb776a14f327c20d4984ac4b724a934df34bfe31 (diff)
parent186efd5275bbe7ffb73d939c1ce5690682668200 (diff)
Merge master.kernel.org:/home/rmk/linux-2.6-arm-smp
Diffstat (limited to 'include/asm-arm')
-rw-r--r--include/asm-arm/bitops.h4
-rw-r--r--include/asm-arm/locks.h36
-rw-r--r--include/asm-arm/spinlock.h53
-rw-r--r--include/asm-arm/system.h92
4 files changed, 127 insertions, 58 deletions
diff --git a/include/asm-arm/bitops.h b/include/asm-arm/bitops.h
index 4edd4dc40c5..c1adc6b3e86 100644
--- a/include/asm-arm/bitops.h
+++ b/include/asm-arm/bitops.h
@@ -21,8 +21,8 @@
#include <asm/system.h>
-#define smp_mb__before_clear_bit() do { } while (0)
-#define smp_mb__after_clear_bit() do { } while (0)
+#define smp_mb__before_clear_bit() mb()
+#define smp_mb__after_clear_bit() mb()
/*
* These functions are the basis of our bit ops.
diff --git a/include/asm-arm/locks.h b/include/asm-arm/locks.h
index 9cb33fcc06c..f08dc844791 100644
--- a/include/asm-arm/locks.h
+++ b/include/asm-arm/locks.h
@@ -28,7 +28,8 @@
" blmi " #fail \
: \
: "r" (ptr), "I" (1) \
- : "ip", "lr", "cc", "memory"); \
+ : "ip", "lr", "cc"); \
+ smp_mb(); \
})
#define __down_op_ret(ptr,fail) \
@@ -48,12 +49,14 @@
" mov %0, ip" \
: "=&r" (ret) \
: "r" (ptr), "I" (1) \
- : "ip", "lr", "cc", "memory"); \
+ : "ip", "lr", "cc"); \
+ smp_mb(); \
ret; \
})
#define __up_op(ptr,wake) \
({ \
+ smp_mb(); \
__asm__ __volatile__( \
"@ up_op\n" \
"1: ldrex lr, [%0]\n" \
@@ -66,7 +69,7 @@
" blle " #wake \
: \
: "r" (ptr), "I" (1) \
- : "ip", "lr", "cc", "memory"); \
+ : "ip", "lr", "cc"); \
})
/*
@@ -92,11 +95,13 @@
" blne " #fail \
: \
: "r" (ptr), "I" (RW_LOCK_BIAS) \
- : "ip", "lr", "cc", "memory"); \
+ : "ip", "lr", "cc"); \
+ smp_mb(); \
})
#define __up_op_write(ptr,wake) \
({ \
+ smp_mb(); \
__asm__ __volatile__( \
"@ up_op_read\n" \
"1: ldrex lr, [%0]\n" \
@@ -108,7 +113,7 @@
" blcs " #wake \
: \
: "r" (ptr), "I" (RW_LOCK_BIAS) \
- : "ip", "lr", "cc", "memory"); \
+ : "ip", "lr", "cc"); \
})
#define __down_op_read(ptr,fail) \
@@ -116,6 +121,7 @@
#define __up_op_read(ptr,wake) \
({ \
+ smp_mb(); \
__asm__ __volatile__( \
"@ up_op_read\n" \
"1: ldrex lr, [%0]\n" \
@@ -128,7 +134,7 @@
" bleq " #wake \
: \
: "r" (ptr), "I" (1) \
- : "ip", "lr", "cc", "memory"); \
+ : "ip", "lr", "cc"); \
})
#else
@@ -148,7 +154,8 @@
" blmi " #fail \
: \
: "r" (ptr), "I" (1) \
- : "ip", "lr", "cc", "memory"); \
+ : "ip", "lr", "cc"); \
+ smp_mb(); \
})
#define __down_op_ret(ptr,fail) \
@@ -169,12 +176,14 @@
" mov %0, ip" \
: "=&r" (ret) \
: "r" (ptr), "I" (1) \
- : "ip", "lr", "cc", "memory"); \
+ : "ip", "lr", "cc"); \
+ smp_mb(); \
ret; \
})
#define __up_op(ptr,wake) \
({ \
+ smp_mb(); \
__asm__ __volatile__( \
"@ up_op\n" \
" mrs ip, cpsr\n" \
@@ -188,7 +197,7 @@
" blle " #wake \
: \
: "r" (ptr), "I" (1) \
- : "ip", "lr", "cc", "memory"); \
+ : "ip", "lr", "cc"); \
})
/*
@@ -215,7 +224,8 @@
" blne " #fail \
: \
: "r" (ptr), "I" (RW_LOCK_BIAS) \
- : "ip", "lr", "cc", "memory"); \
+ : "ip", "lr", "cc"); \
+ smp_mb(); \
})
#define __up_op_write(ptr,wake) \
@@ -233,7 +243,8 @@
" blcs " #wake \
: \
: "r" (ptr), "I" (RW_LOCK_BIAS) \
- : "ip", "lr", "cc", "memory"); \
+ : "ip", "lr", "cc"); \
+ smp_mb(); \
})
#define __down_op_read(ptr,fail) \
@@ -241,6 +252,7 @@
#define __up_op_read(ptr,wake) \
({ \
+ smp_mb(); \
__asm__ __volatile__( \
"@ up_op_read\n" \
" mrs ip, cpsr\n" \
@@ -254,7 +266,7 @@
" bleq " #wake \
: \
: "r" (ptr), "I" (1) \
- : "ip", "lr", "cc", "memory"); \
+ : "ip", "lr", "cc"); \
})
#endif
diff --git a/include/asm-arm/spinlock.h b/include/asm-arm/spinlock.h
index 9705d5eec94..1f906d09b68 100644
--- a/include/asm-arm/spinlock.h
+++ b/include/asm-arm/spinlock.h
@@ -8,9 +8,10 @@
/*
* ARMv6 Spin-locking.
*
- * We (exclusively) read the old value, and decrement it. If it
- * hits zero, we may have won the lock, so we try (exclusively)
- * storing it.
+ * We exclusively read the old value. If it is zero, we may have
+ * won the lock, so we try exclusively storing it. A memory barrier
+ * is required after we get a lock, and before we release it, because
+ * V6 CPUs are assumed to have weakly ordered memory.
*
* Unlocked value: 0
* Locked value: 1
@@ -41,7 +42,9 @@ static inline void _raw_spin_lock(spinlock_t *lock)
" bne 1b"
: "=&r" (tmp)
: "r" (&lock->lock), "r" (1)
- : "cc", "memory");
+ : "cc");
+
+ smp_mb();
}
static inline int _raw_spin_trylock(spinlock_t *lock)
@@ -54,18 +57,25 @@ static inline int _raw_spin_trylock(spinlock_t *lock)
" strexeq %0, %2, [%1]"
: "=&r" (tmp)
: "r" (&lock->lock), "r" (1)
- : "cc", "memory");
-
- return tmp == 0;
+ : "cc");
+
+ if (tmp == 0) {
+ smp_mb();
+ return 1;
+ } else {
+ return 0;
+ }
}
static inline void _raw_spin_unlock(spinlock_t *lock)
{
+ smp_mb();
+
__asm__ __volatile__(
" str %1, [%0]"
:
: "r" (&lock->lock), "r" (0)
- : "cc", "memory");
+ : "cc");
}
/*
@@ -98,7 +108,9 @@ static inline void _raw_write_lock(rwlock_t *rw)
" bne 1b"
: "=&r" (tmp)
: "r" (&rw->lock), "r" (0x80000000)
- : "cc", "memory");
+ : "cc");
+
+ smp_mb();
}
static inline int _raw_write_trylock(rwlock_t *rw)
@@ -111,18 +123,25 @@ static inline int _raw_write_trylock(rwlock_t *rw)
" strexeq %0, %2, [%1]"
: "=&r" (tmp)
: "r" (&rw->lock), "r" (0x80000000)
- : "cc", "memory");
-
- return tmp == 0;
+ : "cc");
+
+ if (tmp == 0) {
+ smp_mb();
+ return 1;
+ } else {
+ return 0;
+ }
}
static inline void _raw_write_unlock(rwlock_t *rw)
{
+ smp_mb();
+
__asm__ __volatile__(
"str %1, [%0]"
:
: "r" (&rw->lock), "r" (0)
- : "cc", "memory");
+ : "cc");
}
/*
@@ -149,13 +168,17 @@ static inline void _raw_read_lock(rwlock_t *rw)
" bmi 1b"
: "=&r" (tmp), "=&r" (tmp2)
: "r" (&rw->lock)
- : "cc", "memory");
+ : "cc");
+
+ smp_mb();
}
static inline void _raw_read_unlock(rwlock_t *rw)
{
unsigned long tmp, tmp2;
+ smp_mb();
+
__asm__ __volatile__(
"1: ldrex %0, [%2]\n"
" sub %0, %0, #1\n"
@@ -164,7 +187,7 @@ static inline void _raw_read_unlock(rwlock_t *rw)
" bne 1b"
: "=&r" (tmp), "=&r" (tmp2)
: "r" (&rw->lock)
- : "cc", "memory");
+ : "cc");
}
#define _raw_read_trylock(lock) generic_raw_read_trylock(lock)
diff --git a/include/asm-arm/system.h b/include/asm-arm/system.h
index 2f44b204421..8efa4ebdcac 100644
--- a/include/asm-arm/system.h
+++ b/include/asm-arm/system.h
@@ -139,7 +139,12 @@ extern unsigned int user_debug;
#define vectors_high() (0)
#endif
+#if __LINUX_ARM_ARCH__ >= 6
+#define mb() __asm__ __volatile__ ("mcr p15, 0, %0, c7, c10, 5" \
+ : : "r" (0) : "memory")
+#else
#define mb() __asm__ __volatile__ ("" : : : "memory")
+#endif
#define rmb() mb()
#define wmb() mb()
#define read_barrier_depends() do { } while(0)
@@ -323,12 +328,8 @@ do { \
* NOTE that this solution won't work on an SMP system, so explcitly
* forbid it here.
*/
-#ifdef CONFIG_SMP
-#error SMP is not supported on SA1100/SA110
-#else
#define swp_is_buggy
#endif
-#endif
static inline unsigned long __xchg(unsigned long x, volatile void *ptr, int size)
{
@@ -337,35 +338,68 @@ static inline unsigned long __xchg(unsigned long x, volatile void *ptr, int size
#ifdef swp_is_buggy
unsigned long flags;
#endif
+#if __LINUX_ARM_ARCH__ >= 6
+ unsigned int tmp;
+#endif
switch (size) {
-#ifdef swp_is_buggy
- case 1:
- local_irq_save(flags);
- ret = *(volatile unsigned char *)ptr;
- *(volatile unsigned char *)ptr = x;
- local_irq_restore(flags);
- break;
-
- case 4:
- local_irq_save(flags);
- ret = *(volatile unsigned long *)ptr;
- *(volatile unsigned long *)ptr = x;
- local_irq_restore(flags);
- break;
+#if __LINUX_ARM_ARCH__ >= 6
+ case 1:
+ asm volatile("@ __xchg1\n"
+ "1: ldrexb %0, [%3]\n"
+ " strexb %1, %2, [%3]\n"
+ " teq %1, #0\n"
+ " bne 1b"
+ : "=&r" (ret), "=&r" (tmp)
+ : "r" (x), "r" (ptr)
+ : "memory", "cc");
+ break;
+ case 4:
+ asm volatile("@ __xchg4\n"
+ "1: ldrex %0, [%3]\n"
+ " strex %1, %2, [%3]\n"
+ " teq %1, #0\n"
+ " bne 1b"
+ : "=&r" (ret), "=&r" (tmp)
+ : "r" (x), "r" (ptr)
+ : "memory", "cc");
+ break;
+#elif defined(swp_is_buggy)
+#ifdef CONFIG_SMP
+#error SMP is not supported on this platform
+#endif
+ case 1:
+ local_irq_save(flags);
+ ret = *(volatile unsigned char *)ptr;
+ *(volatile unsigned char *)ptr = x;
+ local_irq_restore(flags);
+ break;
+
+ case 4:
+ local_irq_save(flags);
+ ret = *(volatile unsigned long *)ptr;
+ *(volatile unsigned long *)ptr = x;
+ local_irq_restore(flags);
+ break;
#else
- case 1: __asm__ __volatile__ ("swpb %0, %1, [%2]"
- : "=&r" (ret)
- : "r" (x), "r" (ptr)
- : "memory", "cc");
- break;
- case 4: __asm__ __volatile__ ("swp %0, %1, [%2]"
- : "=&r" (ret)
- : "r" (x), "r" (ptr)
- : "memory", "cc");
- break;
+ case 1:
+ asm volatile("@ __xchg1\n"
+ " swpb %0, %1, [%2]"
+ : "=&r" (ret)
+ : "r" (x), "r" (ptr)
+ : "memory", "cc");
+ break;
+ case 4:
+ asm volatile("@ __xchg4\n"
+ " swp %0, %1, [%2]"
+ : "=&r" (ret)
+ : "r" (x), "r" (ptr)
+ : "memory", "cc");
+ break;
#endif
- default: __bad_xchg(ptr, size), ret = 0;
+ default:
+ __bad_xchg(ptr, size), ret = 0;
+ break;
}
return ret;