Module Name: src
Committed By: riastradh
Date: Wed Jul 24 00:49:19 UTC 2013
Modified Files:
src/sys/external/bsd/drm2/include/linux [riastradh-drm2]: spinlock.h
Log Message:
Implement Linux spin lock in terms of kmutex_t in drm2's <linux/spinlock.h>.
Currently a spin lock will be an adaptive mutex, until I identify
cases in drm2 that actually require spinning and interrupt deferral.
To generate a diff of this commit:
cvs rdiff -u -r1.1.2.1 -r1.1.2.2 \
src/sys/external/bsd/drm2/include/linux/spinlock.h
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/sys/external/bsd/drm2/include/linux/spinlock.h
diff -u src/sys/external/bsd/drm2/include/linux/spinlock.h:1.1.2.1 src/sys/external/bsd/drm2/include/linux/spinlock.h:1.1.2.2
--- src/sys/external/bsd/drm2/include/linux/spinlock.h:1.1.2.1 Wed Jul 24 00:33:12 2013
+++ src/sys/external/bsd/drm2/include/linux/spinlock.h Wed Jul 24 00:49:19 2013
@@ -1,4 +1,4 @@
-/* $NetBSD: spinlock.h,v 1.1.2.1 2013/07/24 00:33:12 riastradh Exp $ */
+/* $NetBSD: spinlock.h,v 1.1.2.2 2013/07/24 00:49:19 riastradh Exp $ */
/*-
* Copyright (c) 2013 The NetBSD Foundation, Inc.
@@ -32,4 +32,43 @@
#ifndef _LINUX_SPINLOCK_H_
#define _LINUX_SPINLOCK_H_
+#include <sys/cdefs.h>
+#include <sys/mutex.h>
+
+typedef struct {
+ kmutex_t sl_lock;
+} spinlock_t;
+
+static inline void
+spin_lock(spinlock_t *spinlock)
+{
+ mutex_enter(&spinlock->sl_lock);
+}
+
+static inline void
+spin_unlock(spinlock_t *spinlock)
+{
+ mutex_exit(&spinlock->sl_lock);
+}
+
+/* Must be a macro because the second argument is to be assigned. */
+#define spin_lock_irqsave(SPINLOCK, FLAGS) \
+ do { \
+ (FLAGS) = 0; \
+ mutex_enter(&((spinlock_t *)(SPINLOCK))->sl_lock); \
+ } while (0)
+
+static inline void
+spin_lock_irqrestore(spinlock_t *spinlock, unsigned long __unused flags)
+{
+ mutex_exit(&spinlock->sl_lock);
+}
+
+static inline void
+spin_lock_init(spinlock_t *spinlock)
+{
+ /* XXX Need to identify which need to block intrs. */
+ mutex_init(&spinlock->sl_lock, MUTEX_DEFAULT, IPL_NONE);
+}
+
#endif /* _LINUX_SPINLOCK_H_ */
