Module Name: src
Committed By: riastradh
Date: Sun Dec 19 10:48:37 UTC 2021
Modified Files:
src/sys/external/bsd/drm2/include/linux: kref.h refcount.h
Log Message:
Linux refcount API
To generate a diff of this commit:
cvs rdiff -u -r1.9 -r1.10 src/sys/external/bsd/drm2/include/linux/kref.h
cvs rdiff -u -r1.1 -r1.2 src/sys/external/bsd/drm2/include/linux/refcount.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/kref.h
diff -u src/sys/external/bsd/drm2/include/linux/kref.h:1.9 src/sys/external/bsd/drm2/include/linux/kref.h:1.10
--- src/sys/external/bsd/drm2/include/linux/kref.h:1.9 Sun Dec 19 01:46:01 2021
+++ src/sys/external/bsd/drm2/include/linux/kref.h Sun Dec 19 10:48:37 2021
@@ -1,4 +1,4 @@
-/* $NetBSD: kref.h,v 1.9 2021/12/19 01:46:01 riastradh Exp $ */
+/* $NetBSD: kref.h,v 1.10 2021/12/19 10:48:37 riastradh Exp $ */
/*-
* Copyright (c) 2013 The NetBSD Foundation, Inc.
@@ -37,6 +37,7 @@
#include <sys/systm.h>
#include <linux/atomic.h>
+#include <linux/refcount.h>
#include <linux/mutex.h>
struct kref {
Index: src/sys/external/bsd/drm2/include/linux/refcount.h
diff -u src/sys/external/bsd/drm2/include/linux/refcount.h:1.1 src/sys/external/bsd/drm2/include/linux/refcount.h:1.2
--- src/sys/external/bsd/drm2/include/linux/refcount.h:1.1 Sun Dec 19 01:53:29 2021
+++ src/sys/external/bsd/drm2/include/linux/refcount.h Sun Dec 19 10:48:37 2021
@@ -0,0 +1,130 @@
+/* $NetBSD: refcount.h,v 1.2 2021/12/19 10:48:37 riastradh Exp $ */
+
+/*-
+ * Copyright (c) 2020 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _LINUX_REFCOUNT_H_
+#define _LINUX_REFCOUNT_H_
+
+#include <linux/atomic.h>
+#include <linux/mutex.h>
+#include <linux/spinlock.h>
+
+typedef struct refcount refcount_t;
+
+struct refcount {
+ atomic_t rc_count;
+};
+
+static inline void
+refcount_set(struct refcount *rc, int n)
+{
+ atomic_set(&rc->rc_count, n);
+}
+
+static inline void
+refcount_inc(struct refcount *rc)
+{
+ atomic_inc(&rc->rc_count);
+}
+
+static inline int __must_check
+refcount_inc_not_zero(struct refcount *rc)
+{
+ unsigned old, new;
+
+ do {
+ old = atomic_read(&rc->rc_count);
+ if (old == 0)
+ break;
+ new = old + 1;
+ } while (atomic_cmpxchg(&rc->rc_count, old, new) != old);
+
+ return old;
+}
+
+static inline bool __must_check
+refcount_dec_and_test(struct refcount *rc)
+{
+ unsigned old, new;
+
+ do {
+ old = atomic_read(&rc->rc_count);
+ KASSERT(old);
+ new = old - 1;
+ } while (atomic_cmpxchg(&rc->rc_count, old, new) != old);
+
+ return old == 1;
+}
+
+static inline bool __must_check
+refcount_dec_and_lock_irqsave(struct refcount *rc, struct spinlock *lock,
+ unsigned long *flagsp)
+{
+ unsigned old, new;
+
+ do {
+ old = atomic_read(&rc->rc_count);
+ KASSERT(old);
+ if (old == 1) {
+ spin_lock_irqsave(lock, *flagsp);
+ if (atomic_dec_return(&rc->rc_count) == 0)
+ return true;
+ spin_unlock_irqrestore(lock, *flagsp);
+ return false;
+ }
+ new = old - 1;
+ } while (atomic_cmpxchg(&rc->rc_count, old, new) != old);
+
+ KASSERT(old != 1);
+ KASSERT(new != 0);
+ return false;
+}
+
+static inline bool __must_check
+refcount_dec_and_mutex_lock(struct refcount *rc, struct mutex *lock)
+{
+ unsigned old, new;
+
+ do {
+ old = atomic_read(&rc->rc_count);
+ KASSERT(old);
+ if (old == 1) {
+ mutex_lock(lock);
+ if (atomic_dec_return(&rc->rc_count) == 0)
+ return true;
+ mutex_unlock(lock);
+ return false;
+ }
+ new = old - 1;
+ } while (atomic_cmpxchg(&rc->rc_count, old, new) != old);
+
+ KASSERT(old != 1);
+ KASSERT(new != 0);
+ return false;
+}
+
+#endif /* _LINUX_REFCOUNT_H_ */
