tests: lib: ringbuffer: Fixing tests for various platforms

Stress test that was validating thread safeness was configured to use
higher sys tick rate and targeting qemu_x86 platform. However, it was
also build for other platforms and was failing. Fixing it by extracting
stress tests to separate configuration that is run only on qemu_x86.

Modified the test to fail when number of preemptions is less than
expected only on qemu_x86.

Signed-off-by: Krzysztof Chruscinski <krzysztof.chruscinski@nordicsemi.no>

tests/lib/ringbuffer/prj.conf

@@ -2,4 +2,3 @@ CONFIG_ZTEST=y
 CONFIG_IRQ_OFFLOAD=y
 CONFIG_RING_BUFFER=y
 CONFIG_TEST_RANDOM_GENERATOR=y
-CONFIG_SYS_CLOCK_TICKS_PER_SEC=100000

tests/lib/ringbuffer/src/concurrent.c

@@ -330,7 +330,7 @@ static void microdelay(int delay)
 static void thread_entry_spsc(void *p1, void *p2, void *p3)
 {
 	struct ring_buf *rbuf = p1;
-	uint32_t timeout = 5000;
+	uint32_t timeout = 6000;
 	bool high_producer = (bool)p2;
 	uint32_t start = k_uptime_get_32();
 	struct k_timer timer;
@@ -370,10 +370,16 @@ static void thread_entry_spsc(void *p1, void *p2, void *p3)
 	}
 
 	PRINT("preempted: %d\n", preempt_cnt);
-	zassert_true(preempt_cnt > 1500, "If thread operation was not preempted "
+	/* Test is tailored for qemu_x86 to generate enough number of preemptions
+	 * to validate that ring buffer is safe to be used without any locks in
+	 * single producer single consumer scenario.
+	 */
+	if (IS_ENABLED(CONFIG_BOARD_QEMU_X86)) {
+		zassert_true(preempt_cnt > 1500, "If thread operation was not preempted "
 			"multiple times then we cannot have confidance that it "
 			"validated the module properly. Platform should not be "
 			"used in that case");
+	}
 }
 
 extern uint32_t test_rewind_threshold;
@@ -387,8 +393,7 @@ static void test_ringbuffer_spsc(bool higher_producer, int api_type)
 	uint8_t buf[32];
 	uint32_t buf32[32];
 
-	/* Native posix cannot have sys tick high enough to run this stress test. */
-	if (IS_ENABLED(CONFIG_BOARD_NATIVE_POSIX)) {
+	if (CONFIG_SYS_CLOCK_TICKS_PER_SEC < 100000) {
 		ztest_test_skip();
 	}
 

tests/lib/ringbuffer/testcase.yaml

@@ -1,7 +1,16 @@
-tests:
-  libraries.data_structures:
+common:
     tags: ring_buffer circular_buffer
+
+tests:
+  libraries.ring_buffer:
     # FIXME: qemu_arc_hs6x excluded, see #37861
     platform_exclude: qemu_arc_hs6x
+    integration_platforms:
+      - native_posix
+
+  libraries.ring_buffer_concurrent:
+    platform_allow: qemu_x86
+    extra_configs:
+      - CONFIG_SYS_CLOCK_TICKS_PER_SEC=100000
     integration_platforms:
       - qemu_x86