---

yaml
---
r: 79804
b: refs/heads/master
c: 1075cf7
h: refs/heads/master
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: cf244e30f5b50763cbe85f7de30923d12999e38d
+refs/heads/master: 1075cf7a959f72833e54dd2d4f885617e58e3e0a

trunk/include/asm-x86/spinlock.h

@@ -1,6 +1,22 @@
 #ifndef _X86_SPINLOCK_H_
 #define _X86_SPINLOCK_H_
 
+#include <asm/atomic.h>
+#include <asm/rwlock.h>
+#include <asm/page.h>
+#include <asm/processor.h>
+
+/*
+ * Your basic SMP spinlocks, allowing only a single CPU anywhere
+ *
+ * Simple spin lock operations.  There are two variants, one clears IRQ's
+ * on the local processor, one does not.
+ *
+ * We make no fairness assumptions. They have a cost.
+ *
+ * (the type definitions are in asm/spinlock_types.h)
+ */
+
 #ifdef CONFIG_PARAVIRT
 #include <asm/paravirt.h>
 #else
@@ -11,9 +27,200 @@
 #endif /* CONFIG_PARAVIRT */
 
 #ifdef CONFIG_X86_32
-# include "spinlock_32.h"
+typedef char _slock_t;
+# define LOCK_INS_DEC "decb"
+# define LOCK_INS_XCH "xchgb"
+# define LOCK_INS_MOV "movb"
+# define LOCK_INS_CMP "cmpb"
+# define LOCK_PTR_REG "a"
 #else
-# include "spinlock_64.h"
+typedef int _slock_t;
+# define LOCK_INS_DEC "decl"
+# define LOCK_INS_XCH "xchgl"
+# define LOCK_INS_MOV "movl"
+# define LOCK_INS_CMP "cmpl"
+# define LOCK_PTR_REG "D"
+#endif
+
+static inline int __raw_spin_is_locked(raw_spinlock_t *lock)
+{
+	return *(volatile _slock_t *)(&(lock)->slock) <= 0;
+}
+
+static inline void __raw_spin_lock(raw_spinlock_t *lock)
+{
+	asm volatile(
+		"\n1:\t"
+		LOCK_PREFIX " ; " LOCK_INS_DEC " %0\n\t"
+		"jns 3f\n"
+		"2:\t"
+		"rep;nop\n\t"
+		LOCK_INS_CMP " $0,%0\n\t"
+		"jle 2b\n\t"
+		"jmp 1b\n"
+		"3:\n\t"
+		: "+m" (lock->slock) : : "memory");
+}
+
+/*
+ * It is easier for the lock validator if interrupts are not re-enabled
+ * in the middle of a lock-acquire. This is a performance feature anyway
+ * so we turn it off:
+ *
+ * NOTE: there's an irqs-on section here, which normally would have to be
+ * irq-traced, but on CONFIG_TRACE_IRQFLAGS we never use this variant.
+ */
+#ifndef CONFIG_PROVE_LOCKING
+static inline void __raw_spin_lock_flags(raw_spinlock_t *lock,
+					 unsigned long flags)
+{
+	asm volatile(
+		"\n1:\t"
+		LOCK_PREFIX " ; " LOCK_INS_DEC " %[slock]\n\t"
+		"jns 5f\n"
+		"testl $0x200, %[flags]\n\t"
+		"jz 4f\n\t"
+		STI_STRING "\n"
+		"3:\t"
+		"rep;nop\n\t"
+		LOCK_INS_CMP " $0, %[slock]\n\t"
+		"jle 3b\n\t"
+		CLI_STRING "\n\t"
+		"jmp 1b\n"
+		"4:\t"
+		"rep;nop\n\t"
+		LOCK_INS_CMP " $0, %[slock]\n\t"
+		"jg 1b\n\t"
+		"jmp 4b\n"
+		"5:\n\t"
+		: [slock] "+m" (lock->slock)
+		: [flags] "r" ((u32)flags)
+		  CLI_STI_INPUT_ARGS
+		: "memory" CLI_STI_CLOBBERS);
+}
+#endif
+
+static inline int __raw_spin_trylock(raw_spinlock_t *lock)
+{
+	_slock_t oldval;
+
+	asm volatile(
+		LOCK_INS_XCH " %0,%1"
+		:"=q" (oldval), "+m" (lock->slock)
+		:"0" (0) : "memory");
+
+	return oldval > 0;
+}
+
+/*
+ * __raw_spin_unlock based on writing $1 to the low byte.
+ * This method works. Despite all the confusion.
+ * (except on PPro SMP or if we are using OOSTORE, so we use xchgb there)
+ * (PPro errata 66, 92)
+ */
+#if defined(X86_64) || \
+	(!defined(CONFIG_X86_OOSTORE) && !defined(CONFIG_X86_PPRO_FENCE))
+
+static inline void __raw_spin_unlock(raw_spinlock_t *lock)
+{
+	asm volatile(LOCK_INS_MOV " $1,%0" : "=m" (lock->slock) :: "memory");
+}
+
+#else
+
+static inline void __raw_spin_unlock(raw_spinlock_t *lock)
+{
+	unsigned char oldval = 1;
+
+	asm volatile("xchgb %b0, %1"
+		     : "=q" (oldval), "+m" (lock->slock)
+		     : "0" (oldval) : "memory");
+}
+
 #endif
 
+static inline void __raw_spin_unlock_wait(raw_spinlock_t *lock)
+{
+	while (__raw_spin_is_locked(lock))
+		cpu_relax();
+}
+
+/*
+ * Read-write spinlocks, allowing multiple readers
+ * but only one writer.
+ *
+ * NOTE! it is quite common to have readers in interrupts
+ * but no interrupt writers. For those circumstances we
+ * can "mix" irq-safe locks - any writer needs to get a
+ * irq-safe write-lock, but readers can get non-irqsafe
+ * read-locks.
+ *
+ * On x86, we implement read-write locks as a 32-bit counter
+ * with the high bit (sign) being the "contended" bit.
+ */
+
+static inline int __raw_read_can_lock(raw_rwlock_t *lock)
+{
+	return (int)(lock)->lock > 0;
+}
+
+static inline int __raw_write_can_lock(raw_rwlock_t *lock)
+{
+	return (lock)->lock == RW_LOCK_BIAS;
+}
+
+static inline void __raw_read_lock(raw_rwlock_t *rw)
+{
+	asm volatile(LOCK_PREFIX " subl $1,(%0)\n\t"
+		     "jns 1f\n"
+		     "call __read_lock_failed\n\t"
+		     "1:\n"
+		     ::LOCK_PTR_REG (rw) : "memory");
+}
+
+static inline void __raw_write_lock(raw_rwlock_t *rw)
+{
+	asm volatile(LOCK_PREFIX " subl %1,(%0)\n\t"
+		     "jz 1f\n"
+		     "call __write_lock_failed\n\t"
+		     "1:\n"
+		     ::LOCK_PTR_REG (rw), "i" (RW_LOCK_BIAS) : "memory");
+}
+
+static inline int __raw_read_trylock(raw_rwlock_t *lock)
+{
+	atomic_t *count = (atomic_t *)lock;
+
+	atomic_dec(count);
+	if (atomic_read(count) >= 0)
+		return 1;
+	atomic_inc(count);
+	return 0;
+}
+
+static inline int __raw_write_trylock(raw_rwlock_t *lock)
+{
+	atomic_t *count = (atomic_t *)lock;
+
+	if (atomic_sub_and_test(RW_LOCK_BIAS, count))
+		return 1;
+	atomic_add(RW_LOCK_BIAS, count);
+	return 0;
+}
+
+static inline void __raw_read_unlock(raw_rwlock_t *rw)
+{
+	asm volatile(LOCK_PREFIX "incl %0" :"+m" (rw->lock) : : "memory");
+}
+
+static inline void __raw_write_unlock(raw_rwlock_t *rw)
+{
+	asm volatile(LOCK_PREFIX "addl %1, %0"
+		     : "+m" (rw->lock) : "i" (RW_LOCK_BIAS) : "memory");
+}
+
+#define _raw_spin_relax(lock)	cpu_relax()
+#define _raw_read_relax(lock)	cpu_relax()
+#define _raw_write_relax(lock)	cpu_relax()
+
 #endif