[v1 05/24] eal/loongarch: add spinlock operations for LoongArch

[Min Zhou]

This patch adds spinlock operations for LoongArch architecture.
These implementations refer to GLIBC pthread_spin_xxlock(). The
underlying implementation is based on LoongArch atomic
instructions (ie, AMSWAP_DB.W).

Signed-off-by: Min Zhou <zhoumin at loongson.cn>
---
 lib/eal/loongarch/include/rte_spinlock.h | 93 ++++++++++++++++++++++++
 1 file changed, 93 insertions(+)
 create mode 100644 lib/eal/loongarch/include/rte_spinlock.h

diff --git a/lib/eal/loongarch/include/rte_spinlock.h b/lib/eal/loongarch/include/rte_spinlock.h
new file mode 100644
index 0000000000..6b565dc4d9
--- /dev/null
+++ b/lib/eal/loongarch/include/rte_spinlock.h
@@ -0,0 +1,93 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2022 Loongson Technology Corporation Limited
+ */
+
+#ifndef _RTE_SPINLOCK_LOONGARCH_H_
+#define _RTE_SPINLOCK_LOONGARCH_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <rte_common.h>
+#include "generic/rte_spinlock.h"
+
+#ifndef RTE_FORCE_INTRINSICS
+/*
+ * These implementations refer to GLIBC pthread_spin_xxlock().
+ */
+static inline void
+rte_spinlock_lock(rte_spinlock_t *sl)
+{
+	int val = 0;
+
+	if (rte_atomic32_exchange((volatile uint32_t *)&sl->locked, 1) == 0)
+		return;
+
+	do {
+		do {
+			val = sl->locked;
+		} while (val != 0);
+
+	} while (rte_atomic32_exchange((volatile uint32_t *)&sl->locked, 1) == 1);
+}
+
+static inline void
+rte_spinlock_unlock(rte_spinlock_t *sl)
+{
+	sl->locked = 0;
+}
+
+static inline int
+rte_spinlock_trylock(rte_spinlock_t *sl)
+{
+	return rte_atomic32_exchange((volatile uint32_t *)&sl->locked, 1) == 0;
+}
+#endif
+
+static inline int rte_tm_supported(void)
+{
+	return 0;
+}
+
+static inline void
+rte_spinlock_lock_tm(rte_spinlock_t *sl)
+{
+	rte_spinlock_lock(sl); /* fall-back */
+}
+
+static inline int
+rte_spinlock_trylock_tm(rte_spinlock_t *sl)
+{
+	return rte_spinlock_trylock(sl);
+}
+
+static inline void
+rte_spinlock_unlock_tm(rte_spinlock_t *sl)
+{
+	rte_spinlock_unlock(sl);
+}
+
+static inline void
+rte_spinlock_recursive_lock_tm(rte_spinlock_recursive_t *slr)
+{
+	rte_spinlock_recursive_lock(slr); /* fall-back */
+}
+
+static inline void
+rte_spinlock_recursive_unlock_tm(rte_spinlock_recursive_t *slr)
+{
+	rte_spinlock_recursive_unlock(slr);
+}
+
+static inline int
+rte_spinlock_recursive_trylock_tm(rte_spinlock_recursive_t *slr)
+{
+	return rte_spinlock_recursive_trylock(slr);
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _RTE_SPINLOCK_LOONGARCH_H_ */
-- 
2.31.1