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diff --git a/tests/sys/sys/Makefile b/tests/sys/sys/Makefile
--- a/tests/sys/sys/Makefile
+++ b/tests/sys/sys/Makefile
@@ -5,6 +5,7 @@
ATF_TESTS_C= arb_test \
bitset_test \
bitstring_test \
+ buf_ring_test \
qmath_test \
rb_test \
splay_test \
diff --git a/tests/sys/sys/buf_ring_test.c b/tests/sys/sys/buf_ring_test.c
new file mode 100644
--- /dev/null
+++ b/tests/sys/sys/buf_ring_test.c
@@ -0,0 +1,126 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2024 Arm Ltd
+ */
+
+#include <sys/types.h>
+
+#include <machine/cpu.h>
+#include <machine/cpufunc.h>
+
+#include <errno.h>
+
+#include <atf-c.h>
+
+static void critical_enter(void);
+static void critical_exit(void);
+
+#include <sys/buf_ring.h>
+
+static void
+critical_enter(void)
+{
+}
+
+static void
+critical_exit(void)
+{
+}
+
+static void *
+buf_ring_dequeue_peek(struct buf_ring *br)
+{
+ void *val;
+
+ val = buf_ring_peek(br);
+ if (val != NULL)
+ buf_ring_advance_sc(br);
+ return (val);
+}
+
+static void *
+buf_ring_dequeue_peek_clear_sc(struct buf_ring *br)
+{
+ void *val;
+
+ val = buf_ring_peek_clear_sc(br);
+ if (val != NULL)
+ buf_ring_advance_sc(br);
+ return (val);
+}
+
+#define MC_SC_TEST(dequeue_func) \
+ATF_TC_WITHOUT_HEAD(dequeue_func); \
+ATF_TC_BODY(dequeue_func, tc) \
+{ \
+ struct buf_ring *br; \
+ \
+ br = buf_ring_alloc(4); \
+ ATF_REQUIRE_MSG(br != NULL, "buf_ring_alloc returned NULL"); \
+ \
+ ATF_REQUIRE(dequeue_func(br) == NULL); \
+ ATF_REQUIRE(buf_ring_count(br) == 0); \
+ ATF_REQUIRE(!buf_ring_full(br)); \
+ ATF_REQUIRE(buf_ring_empty(br)); \
+ \
+ /* Try filling the buf_ring */ \
+ ATF_REQUIRE(buf_ring_enqueue(br, (void *)1) == 0); \
+ ATF_REQUIRE(buf_ring_enqueue(br, (void *)2) == 0); \
+ ATF_REQUIRE(buf_ring_enqueue(br, (void *)3) == 0); \
+ ATF_REQUIRE(buf_ring_enqueue(br, (void *)4) == ENOBUFS); \
+ \
+ ATF_REQUIRE(buf_ring_count(br) == 3); \
+ ATF_REQUIRE(buf_ring_full(br)); \
+ ATF_REQUIRE(!buf_ring_empty(br)); \
+ \
+ /* Partially empty it */ \
+ ATF_REQUIRE(dequeue_func(br) == (void *)1); \
+ ATF_REQUIRE(dequeue_func(br) == (void *)2); \
+ \
+ ATF_REQUIRE(buf_ring_count(br) == 1); \
+ ATF_REQUIRE(!buf_ring_full(br)); \
+ ATF_REQUIRE(!buf_ring_empty(br)); \
+ \
+ /* Add more items */ \
+ ATF_REQUIRE(buf_ring_enqueue(br, (void *)5) == 0); \
+ ATF_REQUIRE(buf_ring_count(br) == 2); \
+ \
+ /* Finish emptying it */ \
+ ATF_REQUIRE(dequeue_func(br) == (void *)3); \
+ ATF_REQUIRE(dequeue_func(br) == (void *)5); \
+ ATF_REQUIRE(dequeue_func(br) == NULL); \
+ \
+ ATF_REQUIRE(buf_ring_count(br) == 0); \
+ ATF_REQUIRE(!buf_ring_full(br)); \
+ ATF_REQUIRE(buf_ring_empty(br)); \
+ \
+ for (uintptr_t i = 0; i < 8; i++) { \
+ ATF_REQUIRE(buf_ring_enqueue(br, (void *)(i + 100)) == 0); \
+ ATF_REQUIRE(buf_ring_enqueue(br, (void *)(i + 200)) == 0); \
+ ATF_REQUIRE(buf_ring_enqueue(br, (void *)(i + 300)) == 0); \
+ ATF_REQUIRE(buf_ring_count(br) == 3); \
+ ATF_REQUIRE(dequeue_func(br) == (void *)(i + 100)); \
+ ATF_REQUIRE(dequeue_func(br) == (void *)(i + 200)); \
+ ATF_REQUIRE(dequeue_func(br) == (void *)(i + 300)); \
+ \
+ ATF_REQUIRE(!buf_ring_full(br)); \
+ ATF_REQUIRE(buf_ring_empty(br)); \
+ } \
+ \
+ buf_ring_free(br); \
+}
+
+MC_SC_TEST(buf_ring_dequeue_sc)
+MC_SC_TEST(buf_ring_dequeue_mc)
+MC_SC_TEST(buf_ring_dequeue_peek)
+MC_SC_TEST(buf_ring_dequeue_peek_clear_sc)
+
+ATF_TP_ADD_TCS(tp)
+{
+ ATF_TP_ADD_TC(tp, buf_ring_dequeue_sc);
+ ATF_TP_ADD_TC(tp, buf_ring_dequeue_mc);
+ ATF_TP_ADD_TC(tp, buf_ring_dequeue_peek);
+ ATF_TP_ADD_TC(tp, buf_ring_dequeue_peek_clear_sc);
+ return (atf_no_error());
+}

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