[PATCH igt 1/2] Iterate over physical engines

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We current have a single for_each_engine() iterator which we use to
generate both a set of uABI engines and a set of physical engines.
Determining what uABI ring-id corresponds to an actual HW engine is
tricky, so pull that out to a library function and introduce
for_each_physical_engine() for cases where we want to issue requests
once on each HW ring (avoiding aliasing issues).

Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
---
 lib/igt_gt.c               | 23 +++++++++++++
 lib/igt_gt.h               |  9 +++++
 tests/amdgpu/amd_prime.c   |  6 +---
 tests/gem_concurrent_all.c |  2 +-
 tests/gem_ctx_create.c     |  5 +--
 tests/gem_exec_await.c     | 17 +--------
 tests/gem_exec_create.c    | 17 +--------
 tests/gem_exec_fence.c     | 16 ++-------
 tests/gem_exec_gttfill.c   | 16 +--------
 tests/gem_exec_nop.c       | 32 +++--------------
 tests/gem_exec_parallel.c  | 15 ++------
 tests/gem_exec_reloc.c     |  2 +-
 tests/gem_exec_schedule.c  | 21 ++---------
 tests/gem_exec_store.c     |  2 +-
 tests/gem_exec_suspend.c   | 20 +++--------
 tests/gem_exec_whisper.c   | 15 ++------
 tests/gem_ring_sync_loop.c |  2 +-
 tests/gem_spin_batch.c     |  5 +--
 tests/gem_sync.c           | 86 +++++++---------------------------------------
 19 files changed, 72 insertions(+), 239 deletions(-)

diff --git a/lib/igt_gt.c b/lib/igt_gt.c
index f70fcb92..e630550b 100644
--- a/lib/igt_gt.c
+++ b/lib/igt_gt.c
@@ -660,3 +660,26 @@ bool gem_has_engine(int gem_fd,
 			    gem_class_instance_to_eb_flags(gem_fd, class,
 							   instance));
 }
+
+bool gem_ring_is_physical_engine(int fd, unsigned ring)
+{
+	if (ring == I915_EXEC_DEFAULT)
+		return false;
+
+	/* BSD uses an extra flag to chose between aliasing modes */
+	if ((ring & 63) == I915_EXEC_BSD) {
+		bool explicit_bsd = ring & (3 << 13);
+		bool has_bsd2 = gem_has_bsd2(fd);
+		return explicit_bsd ? has_bsd2 : !has_bsd2;
+	}
+
+	return true;
+}
+
+bool gem_ring_has_physical_engine(int fd, unsigned ring)
+{
+	if (!gem_ring_is_physical_engine(fd, ring))
+		return false;
+
+	return gem_has_ring(fd, ring);
+}
diff --git a/lib/igt_gt.h b/lib/igt_gt.h
index 68592410..4d9d1aa0 100644
--- a/lib/igt_gt.h
+++ b/lib/igt_gt.h
@@ -81,6 +81,15 @@ extern const struct intel_execution_engine {
 	     e__++) \
 		for_if (gem_has_ring(fd__, flags__ = e__->exec_id | e__->flags))
 
+#define for_each_physical_engine(fd__, flags__) \
+	for (const struct intel_execution_engine *e__ = intel_execution_engines;\
+	     e__->name; \
+	     e__++) \
+		for_if (gem_ring_has_physical_engine(fd__, flags__ = e__->exec_id | e__->flags))
+
+bool gem_ring_is_physical_engine(int fd, unsigned int ring);
+bool gem_ring_has_physical_engine(int fd, unsigned int ring);
+
 bool gem_can_store_dword(int fd, unsigned int engine);
 
 extern const struct intel_execution_engine2 {
diff --git a/tests/amdgpu/amd_prime.c b/tests/amdgpu/amd_prime.c
index b2f326b4..bb68ccf3 100644
--- a/tests/amdgpu/amd_prime.c
+++ b/tests/amdgpu/amd_prime.c
@@ -179,12 +179,8 @@ static void i915_to_amd(int i915, int amd, amdgpu_device_handle device)
 	struct cork c;
 
 	nengine = 0;
-	for_each_engine(i915, engine) {
-		if (engine == 0)
-			continue;
-
+	for_each_physical_engine(i915, engine)
 		engines[nengine++] = engine;
-	}
 	igt_require(nengine);
 
 	memset(obj, 0, sizeof(obj));
diff --git a/tests/gem_concurrent_all.c b/tests/gem_concurrent_all.c
index 201b491b..3a1097ba 100644
--- a/tests/gem_concurrent_all.c
+++ b/tests/gem_concurrent_all.c
@@ -960,7 +960,7 @@ static igt_hang_t all_hang(void)
 	execbuf.buffers_ptr = to_user_pointer(&obj);
 	execbuf.buffer_count = 1;
 
-	for_each_engine(fd, engine) {
+	for_each_physical_engine(fd, engine) {
 		hang = igt_hang_ring(fd, engine);
 
 		execbuf.flags = engine;
diff --git a/tests/gem_ctx_create.c b/tests/gem_ctx_create.c
index 058445b6..1b32d6c3 100644
--- a/tests/gem_ctx_create.c
+++ b/tests/gem_ctx_create.c
@@ -321,11 +321,8 @@ igt_main
 		igt_require_gem(fd);
 		gem_require_contexts(fd);
 
-		for_each_engine(fd, engine) {
-			if (engine == 0)
-				continue;
+		for_each_physical_engine(fd, engine)
 			all_engines[all_nengine++] = engine;
-		}
 		igt_require(all_nengine);
 
 		if (gem_uses_full_ppgtt(fd)) {
diff --git a/tests/gem_exec_await.c b/tests/gem_exec_await.c
index e19363c4..fccc24d9 100644
--- a/tests/gem_exec_await.c
+++ b/tests/gem_exec_await.c
@@ -44,17 +44,6 @@ static double elapsed(const struct timespec *start, const struct timespec *end)
 		(end->tv_nsec - start->tv_nsec)*1e-9);
 }
 
-static bool ignore_engine(int fd, unsigned engine)
-{
-	if (engine == 0)
-		return true;
-
-	if (gem_has_bsd2(fd) && engine == I915_EXEC_BSD)
-		return true;
-
-	return false;
-}
-
 static void xchg_obj(void *array, unsigned i, unsigned j)
 {
 	struct drm_i915_gem_exec_object2 *obj = array;
@@ -89,12 +78,8 @@ static void wide(int fd, int ring_size, int timeout, unsigned int flags)
 	double time;
 
 	nengine = 0;
-	for_each_engine(fd, engine) {
-		if (ignore_engine(fd, engine))
-			continue;
-
+	for_each_physical_engine(fd, engine)
 		engines[nengine++] = engine;
-	}
 	igt_require(nengine);
 
 	exec = calloc(nengine, sizeof(*exec));
diff --git a/tests/gem_exec_create.c b/tests/gem_exec_create.c
index 28479a9d..54a2429e 100644
--- a/tests/gem_exec_create.c
+++ b/tests/gem_exec_create.c
@@ -54,17 +54,6 @@ static double elapsed(const struct timespec *start, const struct timespec *end)
 		(end->tv_nsec - start->tv_nsec)*1e-9);
 }
 
-static bool ignore_engine(int fd, unsigned engine)
-{
-	if (engine == 0)
-		return true;
-
-	if (gem_has_bsd2(fd) && engine == I915_EXEC_BSD)
-		return true;
-
-	return false;
-}
-
 #define LEAK 0x1
 
 static void all(int fd, unsigned flags, int timeout, int ncpus)
@@ -77,12 +66,8 @@ static void all(int fd, unsigned flags, int timeout, int ncpus)
 	unsigned engine;
 
 	nengine = 0;
-	for_each_engine(fd, engine) {
-		if (ignore_engine(fd, engine))
-			continue;
-
+	for_each_physical_engine(fd, engine)
 		engines[nengine++] = engine;
-	}
 	igt_require(nengine);
 
 	memset(&obj, 0, sizeof(obj));
diff --git a/tests/gem_exec_fence.c b/tests/gem_exec_fence.c
index 312505d6..39ca17ee 100644
--- a/tests/gem_exec_fence.c
+++ b/tests/gem_exec_fence.c
@@ -273,7 +273,7 @@ static void test_fence_await(int fd, unsigned ring, unsigned flags)
 	igt_assert(fence != -1);
 
 	i = 0;
-	for_each_engine(fd, engine) {
+	for_each_physical_engine(fd, engine) {
 		if (!gem_can_store_dword(fd, engine))
 			continue;
 
@@ -521,10 +521,7 @@ static void test_parallel(int fd, unsigned int master)
 	obj[BATCH].relocation_count = 1;
 
 	/* Queue all secondaries */
-	for_each_engine(fd, engine) {
-		if (engine == 0 || engine == I915_EXEC_BSD)
-			continue;
-
+	for_each_physical_engine(fd, engine) {
 		if (engine == master)
 			continue;
 
@@ -699,15 +696,8 @@ static void test_long_history(int fd, long ring_size, unsigned flags)
 		limit = ring_size / 3;
 
 	nengine = 0;
-	for_each_engine(fd, engine) {
-		if (engine == 0)
-			continue;
-
-		if (engine == I915_EXEC_BSD)
-			continue;
-
+	for_each_physical_engine(fd, engine)
 		engines[nengine++] = engine;
-	}
 	igt_require(nengine);
 
 	gem_quiescent_gpu(fd);
diff --git a/tests/gem_exec_gttfill.c b/tests/gem_exec_gttfill.c
index 96ed832f..4097e407 100644
--- a/tests/gem_exec_gttfill.c
+++ b/tests/gem_exec_gttfill.c
@@ -28,17 +28,6 @@ IGT_TEST_DESCRIPTION("Fill the GTT with batches.");
 
 #define BATCH_SIZE (4096<<10)
 
-static bool ignore_engine(int fd, unsigned engine)
-{
-	if (engine == 0)
-		return true;
-
-	if (gem_has_bsd2(fd) && engine == I915_EXEC_BSD)
-		return true;
-
-	return false;
-}
-
 static void xchg_u32(void *array, unsigned i, unsigned j)
 {
 	uint32_t *u32 = array;
@@ -126,10 +115,7 @@ static void fillgtt(int fd, unsigned ring, int timeout)
 
 	nengine = 0;
 	if (ring == 0) {
-		for_each_engine(fd, engine) {
-			if (ignore_engine(fd, engine))
-				continue;
-
+		for_each_physical_engine(fd, engine) {
 			if (!gem_can_store_dword(fd, engine))
 				continue;
 
diff --git a/tests/gem_exec_nop.c b/tests/gem_exec_nop.c
index d3e9a3e0..d971ffcb 100644
--- a/tests/gem_exec_nop.c
+++ b/tests/gem_exec_nop.c
@@ -188,17 +188,6 @@ static void headless(int fd, uint32_t handle)
 	assert_within_epsilon(n_headless, n_display, 0.1f);
 }
 
-static bool ignore_engine(int fd, unsigned engine)
-{
-	if (engine == 0)
-		return true;
-
-	if (gem_has_bsd2(fd) && engine == I915_EXEC_BSD)
-		return true;
-
-	return false;
-}
-
 static void parallel(int fd, uint32_t handle, int timeout)
 {
 	struct drm_i915_gem_execbuffer2 execbuf;
@@ -212,10 +201,7 @@ static void parallel(int fd, uint32_t handle, int timeout)
 
 	sum = 0;
 	nengine = 0;
-	for_each_engine(fd, engine) {
-		if (ignore_engine(fd, engine))
-			continue;
-
+	for_each_physical_engine(fd, engine) {
 		engines[nengine] = engine;
 		names[nengine] = e__->name;
 		nengine++;
@@ -277,10 +263,7 @@ static void series(int fd, uint32_t handle, int timeout)
 	const char *name;
 
 	nengine = 0;
-	for_each_engine(fd, engine) {
-		if (ignore_engine(fd, engine))
-			continue;
-
+	for_each_physical_engine(fd, engine) {
 		time = nop_on_ring(fd, handle, engine, 1, &count) / count;
 		if (time > max) {
 			name = e__->name;
@@ -375,12 +358,9 @@ static void sequential(int fd, uint32_t handle, unsigned flags, int timeout)
 
 	nengine = 0;
 	sum = 0;
-	for_each_engine(fd, n) {
+	for_each_physical_engine(fd, n) {
 		unsigned long count;
 
-		if (ignore_engine(fd, n))
-			continue;
-
 		time = nop_on_ring(fd, handle, n, 1, &count) / count;
 		sum += time;
 		igt_debug("%s: %.3fus\n", e__->name, 1e6*time);
@@ -509,12 +489,8 @@ static void fence_signal(int fd, uint32_t handle,
 
 	nengine = 0;
 	if (ring_id == -1) {
-		for_each_engine(fd, n) {
-			if (ignore_engine(fd, n))
-				continue;
-
+		for_each_physical_engine(fd, n)
 			engines[nengine++] = n;
-		}
 	} else {
 		gem_require_ring(fd, ring_id);
 		engines[nengine++] = ring_id;
diff --git a/tests/gem_exec_parallel.c b/tests/gem_exec_parallel.c
index 11b6e775..fe5ffe8f 100644
--- a/tests/gem_exec_parallel.c
+++ b/tests/gem_exec_parallel.c
@@ -55,17 +55,6 @@ static void check_bo(int fd, uint32_t handle, int pass)
 	munmap(map, 4096);
 }
 
-static bool ignore_engine(int fd, unsigned engine)
-{
-	if (engine == 0)
-		return true;
-
-	if (!gem_can_store_dword(fd, engine))
-		return true;
-
-	return false;
-}
-
 #define CONTEXTS 0x1
 #define FDS 0x2
 
@@ -180,8 +169,8 @@ static void all(int fd, unsigned engine, unsigned flags)
 
 	nengine = 0;
 	if (engine == -1) {
-		for_each_engine(fd, engine) {
-			if (!ignore_engine(fd, engine))
+		for_each_physical_engine(fd, engine) {
+			if (gem_can_store_dword(fd, engine))
 				engines[nengine++] = engine;
 		}
 	} else {
diff --git a/tests/gem_exec_reloc.c b/tests/gem_exec_reloc.c
index 432a42a9..213de1d7 100644
--- a/tests/gem_exec_reloc.c
+++ b/tests/gem_exec_reloc.c
@@ -258,7 +258,7 @@ static void active(int fd, unsigned engine)
 
 	nengine = 0;
 	if (engine == -1) {
-		for_each_engine(fd, engine) {
+		for_each_physical_engine(fd, engine) {
 			if (gem_can_store_dword(fd, engine))
 				engines[nengine++] = engine;
 		}
diff --git a/tests/gem_exec_schedule.c b/tests/gem_exec_schedule.c
index 5f24df33..03d457e9 100644
--- a/tests/gem_exec_schedule.c
+++ b/tests/gem_exec_schedule.c
@@ -188,17 +188,6 @@ static void fifo(int fd, unsigned ring)
 	munmap(ptr, 4096);
 }
 
-static bool ignore_engine(int fd, unsigned engine)
-{
-	if (engine == 0)
-		return true;
-
-	if (gem_has_bsd2(fd) && engine == I915_EXEC_BSD)
-		return true;
-
-	return false;
-}
-
 static void smoketest(int fd, unsigned ring, unsigned timeout)
 {
 	const int ncpus = sysconf(_SC_NPROCESSORS_ONLN);
@@ -210,12 +199,8 @@ static void smoketest(int fd, unsigned ring, unsigned timeout)
 
 	nengine = 0;
 	if (ring == -1) {
-		for_each_engine(fd, engine) {
-			if (ignore_engine(fd, engine))
-				continue;
-
+		for_each_physical_engine(fd, engine)
 			engines[nengine++] = engine;
-		}
 	} else {
 		engines[nengine++] = ring;
 	}
@@ -440,7 +425,7 @@ static void preempt_other(int fd, unsigned ring)
 	gem_context_set_priority(fd, ctx[HI], MAX_PRIO);
 
 	n = 0;
-	for_each_engine(fd, other) {
+	for_each_physical_engine(fd, other) {
 		igt_assert(n < ARRAY_SIZE(spin));
 
 		spin[n] = __igt_spin_batch_new(fd, ctx[NOISE], other, 0);
@@ -496,7 +481,7 @@ static void preempt_self(int fd, unsigned ring)
 
 	n = 0;
 	gem_context_set_priority(fd, ctx[HI], MIN_PRIO);
-	for_each_engine(fd, other) {
+	for_each_physical_engine(fd, other) {
 		spin[n] = __igt_spin_batch_new(fd, ctx[NOISE], other, 0);
 		store_dword(fd, ctx[HI], other,
 			    result, (n + 1)*sizeof(uint32_t), n + 1,
diff --git a/tests/gem_exec_store.c b/tests/gem_exec_store.c
index 31a2c096..a7673489 100644
--- a/tests/gem_exec_store.c
+++ b/tests/gem_exec_store.c
@@ -220,7 +220,7 @@ static void store_all(int fd)
 
 	nengine = 0;
 	intel_detect_and_clear_missed_interrupts(fd);
-	for_each_engine(fd, engine) {
+	for_each_physical_engine(fd, engine) {
 		if (!gem_can_store_dword(fd, engine))
 			continue;
 
diff --git a/tests/gem_exec_suspend.c b/tests/gem_exec_suspend.c
index bbdc6e55..351347cb 100644
--- a/tests/gem_exec_suspend.c
+++ b/tests/gem_exec_suspend.c
@@ -62,25 +62,13 @@ static void check_bo(int fd, uint32_t handle)
 	munmap(map, 4096);
 }
 
-static bool ignore_engine(int fd, unsigned engine)
-{
-	if (engine == 0)
-		return true;
-
-	if (!gem_can_store_dword(fd, engine))
-		return true;
-
-	return false;
-}
-
 static void test_all(int fd, unsigned flags)
 {
 	unsigned engine;
 
-	for_each_engine(fd, engine) {
-		if (!ignore_engine(fd, engine))
+	for_each_physical_engine(fd, engine)
+		if (gem_can_store_dword(fd, engine))
 			run_test(fd, engine, flags & ~0xff);
-	}
 }
 
 static bool has_semaphores(int fd)
@@ -118,8 +106,8 @@ static void run_test(int fd, unsigned engine, unsigned flags)
 		 * GPU is then unlikely to be active!)
 		 */
 		if (has_semaphores(fd)) {
-			for_each_engine(fd, engine) {
-				if (!ignore_engine(fd, engine))
+			for_each_physical_engine(fd, engine) {
+				if (gem_can_store_dword(fd, engine))
 					engines[nengine++] = engine;
 			}
 		} else {
diff --git a/tests/gem_exec_whisper.c b/tests/gem_exec_whisper.c
index 5f9fedf5..1f4dad63 100644
--- a/tests/gem_exec_whisper.c
+++ b/tests/gem_exec_whisper.c
@@ -79,17 +79,6 @@ static void verify_reloc(int fd, uint32_t handle,
 	}
 }
 
-static bool ignore_engine(int fd, unsigned engine)
-{
-	if (engine == 0)
-		return true;
-
-	if (!gem_can_store_dword(fd, engine))
-		return true;
-
-	return false;
-}
-
 #define CONTEXTS 0x1
 #define FDS 0x2
 #define INTERRUPTIBLE 0x4
@@ -217,8 +206,8 @@ static void whisper(int fd, unsigned engine, unsigned flags)
 
 	nengine = 0;
 	if (engine == -1) {
-		for_each_engine(fd, engine) {
-			if (!ignore_engine(fd, engine))
+		for_each_physical_engine(fd, engine) {
+			if (gem_can_store_dword(fd, engine))
 				engines[nengine++] = engine;
 		}
 	} else {
diff --git a/tests/gem_ring_sync_loop.c b/tests/gem_ring_sync_loop.c
index ab5bedb3..118f3638 100644
--- a/tests/gem_ring_sync_loop.c
+++ b/tests/gem_ring_sync_loop.c
@@ -48,7 +48,7 @@ sync_loop(int fd)
 	int i;
 
 	nengine = 0;
-	for_each_engine(fd, engine)
+	for_each_physical_engine(fd, engine)
 		engines[nengine++] = engine;
 	igt_require(nengine);
 
diff --git a/tests/gem_spin_batch.c b/tests/gem_spin_batch.c
index 89631130..026f9830 100644
--- a/tests/gem_spin_batch.c
+++ b/tests/gem_spin_batch.c
@@ -76,10 +76,7 @@ static void spin_on_all_engines(int fd, unsigned int timeout_sec)
 {
 	unsigned engine;
 
-	for_each_engine(fd, engine) {
-		if (engine == 0)
-			continue;
-
+	for_each_physical_engine(fd, engine) {
 		igt_fork(child, 1) {
 			igt_install_exit_handler(spin_exit_handler);
 			spin(fd, engine, timeout_sec);
diff --git a/tests/gem_sync.c b/tests/gem_sync.c
index d70515ea..788fafc3 100644
--- a/tests/gem_sync.c
+++ b/tests/gem_sync.c
@@ -86,23 +86,9 @@ sync_ring(int fd, unsigned ring, int num_children, int timeout)
 	int num_engines = 0;
 
 	if (ring == ~0u) {
-		const struct intel_execution_engine *e;
-
-		for (e = intel_execution_engines; e->name; e++) {
-			if (e->exec_id == 0)
-				continue;
-
-			if (!gem_has_ring(fd, e->exec_id | e->flags))
-				continue;
-
-			if (e->exec_id == I915_EXEC_BSD) {
-				int is_bsd2 = e->flags != 0;
-				if (gem_has_bsd2(fd) != is_bsd2)
-					continue;
-			}
-
-			names[num_engines] = e->name;
-			engines[num_engines++] = e->exec_id | e->flags;
+		for_each_physical_engine(fd, ring) {
+			names[num_engines] = e__->name;
+			engines[num_engines++] = ring;
 			if (num_engines == ARRAY_SIZE(engines))
 				break;
 		}
@@ -200,26 +186,9 @@ store_ring(int fd, unsigned ring, int num_children, int timeout)
 	int num_engines = 0;
 
 	if (ring == ~0u) {
-		const struct intel_execution_engine *e;
-
-		for (e = intel_execution_engines; e->name; e++) {
-			if (e->exec_id == 0)
-				continue;
-
-			if (!gem_has_ring(fd, e->exec_id | e->flags))
-				continue;
-
-			if (!gem_can_store_dword(fd, e->exec_id | e->flags))
-				continue;
-
-			if (e->exec_id == I915_EXEC_BSD) {
-				int is_bsd2 = e->flags != 0;
-				if (gem_has_bsd2(fd) != is_bsd2)
-					continue;
-			}
-
-			names[num_engines] = e->name;
-			engines[num_engines++] = e->exec_id | e->flags;
+		for_each_physical_engine(fd, ring) {
+			names[num_engines] = e__->name;
+			engines[num_engines++] = ring;
 			if (num_engines == ARRAY_SIZE(engines))
 				break;
 		}
@@ -502,31 +471,14 @@ store_many(int fd, unsigned ring, int timeout)
 	intel_detect_and_clear_missed_interrupts(fd);
 
 	if (ring == ~0u) {
-		const struct intel_execution_engine *e;
-
-		for (e = intel_execution_engines; e->name; e++) {
-			if (e->exec_id == 0)
-				continue;
-
-			if (!gem_has_ring(fd, e->exec_id | e->flags))
-				continue;
-
-			if (!gem_can_store_dword(fd, e->exec_id | e->flags))
-				continue;
-
-			if (e->exec_id == I915_EXEC_BSD) {
-				int is_bsd2 = e->flags != 0;
-				if (gem_has_bsd2(fd) != is_bsd2)
-					continue;
-			}
-
+		for_each_physical_engine(fd, ring) {
 			igt_fork(child, 1)
 				__store_many(fd,
-					     e->exec_id | e->flags,
+					     ring,
 					     timeout,
 					     &shared[n]);
 
-			names[n++] = e->name;
+			names[n++] = e__->name;
 		}
 		igt_waitchildren();
 	} else {
@@ -737,23 +689,9 @@ preempt(int fd, unsigned ring, int num_children, int timeout)
 	uint32_t ctx[2];
 
 	if (ring == ~0u) {
-		const struct intel_execution_engine *e;
-
-		for (e = intel_execution_engines; e->name; e++) {
-			if (e->exec_id == 0)
-				continue;
-
-			if (!gem_has_ring(fd, e->exec_id | e->flags))
-				continue;
-
-			if (e->exec_id == I915_EXEC_BSD) {
-				int is_bsd2 = e->flags != 0;
-				if (gem_has_bsd2(fd) != is_bsd2)
-					continue;
-			}
-
-			names[num_engines] = e->name;
-			engines[num_engines++] = e->exec_id | e->flags;
+		for_each_physical_engine(fd, ring) {
+			names[num_engines] = e__->name;
+			engines[num_engines++] = ring;
 			if (num_engines == ARRAY_SIZE(engines))
 				break;
 		}
-- 
2.16.1

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