[dpdk-dev] [PATCH 06/12] Add spinlock operation for IBM Power architecture

[Chao Zhu]

The spinlock operations implemented with assembly code in DPDK only
support x86. This patch add spinlock operations for IBM Power
architecture.

Signed-off-by: Chao Zhu <bjzhuc at cn.ibm.com>
---
 .../include/powerpc/arch/rte_spinlock_arch.h       |   88 ++++++++++++++++++++
 1 files changed, 88 insertions(+), 0 deletions(-)
 create mode 100644 lib/librte_eal/common/include/powerpc/arch/rte_spinlock_arch.h

diff --git a/lib/librte_eal/common/include/powerpc/arch/rte_spinlock_arch.h b/lib/librte_eal/common/include/powerpc/arch/rte_spinlock_arch.h
new file mode 100644
index 0000000..3e4c0ea
--- /dev/null
+++ b/lib/librte_eal/common/include/powerpc/arch/rte_spinlock_arch.h
@@ -0,0 +1,88 @@
+/*
+ *   BSD LICENSE
+ *
+ *   Copyright (C) IBM Corporation 2014.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * 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.
+ *     * Neither the name of IBM Corporation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT
+ *   OWNER 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 _RTE_SPINLOCK_ARCH_H_
+#define _RTE_SPINLOCK_ARCH_H_
+
+#include <rte_lcore.h>
+#include <rte_common.h>
+
+/* Fixme: Use intrinsics to implement the spinlock on Power architecture */
+
+/**
+ * The rte_spinlock_t type.
+ */
+typedef struct {
+	volatile int locked; /**< lock status 0 = unlocked, 1 = locked */
+} rte_spinlock_t;
+
+/**
+ * Take the spinlock.
+ *
+ * @param sl
+ *   A pointer to the spinlock.
+ */
+static inline void
+rte_arch_spinlock_lock(rte_spinlock_t *sl)
+{
+	while (__sync_lock_test_and_set(&sl->locked, 1))
+		while(sl->locked)
+			rte_pause();
+}
+
+/**
+ * Release the spinlock.
+ *
+ * @param sl
+ *   A pointer to the spinlock.
+ */
+static inline void
+rte_arch_spinlock_unlock (rte_spinlock_t *sl)
+{
+	__sync_lock_release(&sl->locked);
+}
+
+/**
+ * Try to take the lock.
+ *
+ * @param sl
+ *   A pointer to the spinlock.
+ * @return
+ *   1 if the lock is successfully taken; 0 otherwise.
+ */
+static inline int
+rte_arch_spinlock_trylock (rte_spinlock_t *sl)
+{
+	return (__sync_lock_test_and_set(&sl->locked,1) == 0);
+}
+
+#endif /* _RTE_SPINLOCK_ARCH_H_ */
\ No newline at end of file
-- 
1.7.1