[igt-dev] [PATCH i-g-t] tests/i915/gem_exec_balancer: exercise dmabuf import

[Matthew Auld]

With parallel submission it should be easy to get a fence array as the
output fence. Try importing this into dma-buf reservation object, to see
if anything explodes.

References: https://gitlab.freedesktop.org/drm/intel/-/issues/7532
Signed-off-by: Matthew Auld <matthew.auld at intel.com>
Cc: Andrzej Hajda <andrzej.hajda at intel.com>
Cc: Nirmoy Das <nirmoy.das at intel.com>
---
 tests/i915/gem_exec_balancer.c | 39 ++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/tests/i915/gem_exec_balancer.c b/tests/i915/gem_exec_balancer.c
index 4300dbd1..fdae8de5 100644
--- a/tests/i915/gem_exec_balancer.c
+++ b/tests/i915/gem_exec_balancer.c
@@ -37,6 +37,7 @@
 #include "igt_sysfs.h"
 #include "igt_types.h"
 #include "sw_sync.h"
+#include <linux/dma-buf.h>
 
 IGT_TEST_DESCRIPTION("Exercise in-kernel load-balancing");
 
@@ -2856,6 +2857,24 @@ static void logical_sort_siblings(int i915,
 #define PARALLEL_SUBMIT_FENCE		(0x1 << 3)
 #define PARALLEL_CONTEXTS		(0x1 << 4)
 #define PARALLEL_VIRTUAL		(0x1 << 5)
+#define PARALLEL_OUT_FENCE_DMABUF	(0x1 << 6)
+
+struct igt_dma_buf_sync_file {
+        __u32 flags;
+        __s32 fd;
+};
+
+#define IGT_DMA_BUF_IOCTL_EXPORT_SYNC_FILE _IOWR(DMA_BUF_BASE, 2, struct igt_dma_buf_sync_file)
+#define IGT_DMA_BUF_IOCTL_IMPORT_SYNC_FILE _IOW(DMA_BUF_BASE, 3, struct igt_dma_buf_sync_file)
+
+static void dmabuf_import_sync_file(int dmabuf, uint32_t flags, int sync_fd)
+{
+        struct igt_dma_buf_sync_file arg;
+
+        arg.flags = flags;
+        arg.fd = sync_fd;
+        do_ioctl(dmabuf, IGT_DMA_BUF_IOCTL_IMPORT_SYNC_FILE, &arg);
+}
 
 static void parallel_thread(int i915, unsigned int flags,
 			    struct i915_engine_class_instance *siblings,
@@ -2871,6 +2890,8 @@ static void parallel_thread(int i915, unsigned int flags,
 	uint32_t target_bo_idx = 0;
 	uint32_t first_bb_idx = 1;
 	intel_ctx_cfg_t cfg;
+	uint32_t dmabuf_handle;
+	int dmabuf;
 
 	igt_assert(bb_per_execbuf < 32);
 
@@ -2924,11 +2945,20 @@ static void parallel_thread(int i915, unsigned int flags,
 	execbuf.buffers_ptr = to_user_pointer(obj);
 	execbuf.rsvd1 = ctx->id;
 
+	if (flags & PARALLEL_OUT_FENCE_DMABUF) {
+		dmabuf_handle = gem_create(i915, 4096);
+		dmabuf = prime_handle_to_fd(i915, dmabuf_handle);
+	}
+
 	for (n = 0; n < PARALLEL_BB_LOOP_COUNT; ++n) {
 		execbuf.flags &= ~0x3full;
 		gem_execbuf_wr(i915, &execbuf);
 
 		if (flags & PARALLEL_OUT_FENCE) {
+			if (flags & PARALLEL_OUT_FENCE_DMABUF)
+				dmabuf_import_sync_file(dmabuf, DMA_BUF_SYNC_WRITE,
+							execbuf.rsvd2 >> 32);
+
 			igt_assert_eq(sync_fence_wait(execbuf.rsvd2 >> 32,
 						      1000), 0);
 			igt_assert_eq(sync_fence_status(execbuf.rsvd2 >> 32), 1);
@@ -2959,6 +2989,11 @@ static void parallel_thread(int i915, unsigned int flags,
 	if (fence)
 		close(fence);
 
+	if (flags & PARALLEL_OUT_FENCE_DMABUF) {
+		gem_close(i915, dmabuf_handle);
+		close(dmabuf);
+	}
+
 	check_bo(i915, obj[target_bo_idx].handle,
 		 bb_per_execbuf * PARALLEL_BB_LOOP_COUNT, true);
 
@@ -3420,6 +3455,10 @@ igt_main
 		igt_subtest("parallel-out-fence")
 			parallel(i915, PARALLEL_OUT_FENCE);
 
+		igt_subtest("parallel-out-fence-import-dmabuf")
+			parallel(i915, PARALLEL_OUT_FENCE |
+				 PARALLEL_OUT_FENCE_DMABUF);
+
 		igt_subtest("parallel-keep-in-fence")
 			parallel(i915, PARALLEL_OUT_FENCE | PARALLEL_IN_FENCE);
 
-- 
2.38.1