[igt-dev] [PATCH i-g-t] lib/i915/intel_memory_region: Fix regression on 5.4 kernel

[Vidya Srinivas <vidya.srinivas@intel.com>]

Starting commit 8759c4a3020ce4 "Add intel_buf_init_in_region"
__intel_buf_init uses gem_create_in_memory_regions instead of
gem_create. Older kernels like 5.4 still dont have support for
I915_GEM_CREATE_EXT_MEMORY_REGIONS (i915_gem_create_ext_ioctl)
from kernel commit (https://patchwork.freedesktop.org/patch/431581/?series=89648&rev=1)
Due to this, the flip-vs-fences tests are failing on kernel 5.4
Patch add roll back to gem_create when __gem_create_in_memory_region_list fails.

Signed-off-by: Vidya Srinivas <vidya.srinivas@intel.com>
---
 lib/i915/intel_memory_region.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/i915/intel_memory_region.c b/lib/i915/intel_memory_region.c
index 3de40549319b..323b96bad232 100644
--- a/lib/i915/intel_memory_region.c
+++ b/lib/i915/intel_memory_region.c
@@ -209,7 +209,9 @@ uint32_t gem_create_in_memory_region_list(int fd, uint64_t size,
 	uint32_t handle;
 	int ret = __gem_create_in_memory_region_list(fd, &handle, size,
 						     mem_regions, num_regions);
-	igt_assert_eq(ret, 0);
+	if (ret != 0)
+		handle = gem_create(fd, size);
+
 	return handle;
 }
 
-- 
2.33.0