[PATCH I-g-t V3 2/2] tests/gem_dummy_reloc_loop: Add one subtest based on multi drm_fd to test CPU<->GPU sync under multi BSD rings

[Zhao Yakui <yakui.zhao@intel.com>]

The Broadwell GT3 machine has two independent BSD rings in kernel driver while
it is transparent to the user-space driver. In such case it needs to check
the CPU<->GPU sync for the second BSD ring.

V1->V2: Follow Daniel's comment to add one subtext instead of one individual
test case, which is used to test the CPU<->GPU sync under multi BSD rings.

V2->V3: Follow Imre's comment to remove the unnecessary initialization and
use igt_assert_f instead of igt_assert

Reviewed-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
---
 tests/gem_dummy_reloc_loop.c |  107 +++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 106 insertions(+), 1 deletion(-)

diff --git a/tests/gem_dummy_reloc_loop.c b/tests/gem_dummy_reloc_loop.c
index a61b59b..4e4dd49 100644
--- a/tests/gem_dummy_reloc_loop.c
+++ b/tests/gem_dummy_reloc_loop.c
@@ -48,6 +48,13 @@ static drm_intel_bufmgr *bufmgr;
 struct intel_batchbuffer *batch;
 static drm_intel_bo *target_buffer;
 
+#define NUM_FD	50
+
+static int mfd[NUM_FD];
+static drm_intel_bufmgr *mbufmgr[NUM_FD];
+static struct intel_batchbuffer *mbatch[NUM_FD];
+static drm_intel_bo *mbuffer[NUM_FD];
+
 /*
  * Testcase: Basic check of ring<->cpu sync using a dummy reloc
  *
@@ -124,6 +131,50 @@ dummy_reloc_loop_random_ring(int num_rings)
 	}
 }
 
+static void
+dummy_reloc_loop_random_ring_multi_fd(int num_rings)
+{
+	int i;
+	struct intel_batchbuffer *saved_batch;
+
+	saved_batch = batch;
+
+	srandom(0xdeadbeef);
+
+	for (i = 0; i < 0x100000; i++) {
+		int mindex;
+		int ring = random() % num_rings + 1;
+
+		mindex = random() % NUM_FD;
+		batch = mbatch[mindex];
+
+		if (ring == I915_EXEC_RENDER) {
+			BEGIN_BATCH(4);
+			OUT_BATCH(MI_COND_BATCH_BUFFER_END | MI_DO_COMPARE);
+			OUT_BATCH(0xffffffff); /* compare dword */
+			OUT_RELOC(mbuffer[mindex], I915_GEM_DOMAIN_RENDER,
+					I915_GEM_DOMAIN_RENDER, 0);
+			OUT_BATCH(MI_NOOP);
+			ADVANCE_BATCH();
+		} else {
+			BEGIN_BATCH(4);
+			OUT_BATCH(MI_FLUSH_DW | 1);
+			OUT_BATCH(0); /* reserved */
+			OUT_RELOC(mbuffer[mindex], I915_GEM_DOMAIN_RENDER,
+					I915_GEM_DOMAIN_RENDER, 0);
+			OUT_BATCH(MI_NOOP | (1<<22) | (0xf));
+			ADVANCE_BATCH();
+		}
+		intel_batchbuffer_flush_on_ring(batch, ring);
+
+		drm_intel_bo_map(target_buffer, 0);
+		// map to force waiting on rendering
+		drm_intel_bo_unmap(target_buffer);
+	}
+
+	batch = saved_batch;
+}
+
 int fd;
 int devid;
 int num_rings;
@@ -133,6 +184,7 @@ igt_main
 	igt_skip_on_simulation();
 
 	igt_fixture {
+		int i;
 		fd = drm_open_any();
 		devid = intel_get_drm_devid(fd);
 		num_rings = gem_get_num_rings(fd);
@@ -148,6 +200,40 @@ igt_main
 
 		target_buffer = drm_intel_bo_alloc(bufmgr, "target bo", 4096, 4096);
 		igt_assert(target_buffer);
+
+		/* Create multi drm_fd and map one gem object to multi gem_contexts */
+		{
+			unsigned int target_flink;
+			char buffer_name[32];
+			if (dri_bo_flink(target_buffer, &target_flink)) {
+				printf("fail to get flink for target buffer\n");
+				igt_assert_f(0, "fail to create global "
+					     "gem_handle for target buffer\n");
+			}
+			for (i = 0; i < NUM_FD; i++) {
+				sprintf(buffer_name, "Target buffer %d\n", i);
+				mfd[i] = drm_open_any();
+				mbufmgr[i] = drm_intel_bufmgr_gem_init(mfd[i], 4096);
+				igt_assert_f(mbufmgr[i],
+					     "fail to initialize buf manager "
+					     "for drm_fd %d\n",
+					     mfd[i]);
+				drm_intel_bufmgr_gem_enable_reuse(mbufmgr[i]);
+				mbatch[i] = intel_batchbuffer_alloc(mbufmgr[i], devid);
+				igt_assert_f(mbatch[i],
+					     "fail to create batchbuffer "
+					     "for drm_fd %d\n",
+					     mfd[i]);
+				mbuffer[i] = intel_bo_gem_create_from_name(
+								mbufmgr[i],
+								buffer_name,
+								target_flink);
+				igt_assert_f(mbuffer[i],
+					     "fail to create gem bo from global "
+					     "gem_handle %d for drm_fd %d\n",
+					     target_flink, mfd[i]);
+			}
+		}
 	}
 
 	igt_subtest("render") {
@@ -190,8 +276,27 @@ igt_main
 			printf("dummy loop run on random rings completed\n");
 		}
 	}
-
+	igt_subtest("mixed_multi_fd") {
+		if (num_rings > 1) {
+			sleep(2);
+			printf("running dummy loop on random rings based on "
+					"multi drm_fd\n");
+			dummy_reloc_loop_random_ring_multi_fd(num_rings);
+			printf("dummy loop run on random rings based on "
+					"multi drm_fd completed\n");
+		}
+	}
 	igt_fixture {
+		int i;
+		/* Free the buffer/batchbuffer/buffer mgr for multi-fd */
+		{
+			for (i = 0; i < NUM_FD; i++) {
+				dri_bo_unreference(mbuffer[i]);
+				intel_batchbuffer_free(mbatch[i]);
+				drm_intel_bufmgr_destroy(mbufmgr[i]);
+				close(mfd[i]);
+			}
+		}
 		drm_intel_bo_unreference(target_buffer);
 		intel_batchbuffer_free(batch);
 		drm_intel_bufmgr_destroy(bufmgr);
-- 
1.7.10.1