[igt-dev] [PATCH i-g-t v3] prime_vgem: Check that we wrap the vgem mmap with userptr

[Chris Wilson]

This came up in a discussion about importing virtio dma-buf, which are
themselves plain shmemfs objects and so not only backed by struct pages,
but wrappable by userptr. vgem share the same properties and so should
serve as a useful proxy for testing.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: "Graunke, Kenneth W" <kenneth.w.graunke at intel.com>,
Cc: "Lahtinen, Joonas" <joonas.lahtinen at intel.com>
Cc: "Kondapally, Kalyan" <kalyan.kondapally at intel.com>
---
 tests/intel-ci/fast-feedback.testlist |  1 +
 tests/prime_vgem.c                    | 31 +++++++++++++++++++++++++++
 2 files changed, 32 insertions(+)

diff --git a/tests/intel-ci/fast-feedback.testlist b/tests/intel-ci/fast-feedback.testlist
index aa2eb3295..982d25834 100644
--- a/tests/intel-ci/fast-feedback.testlist
+++ b/tests/intel-ci/fast-feedback.testlist
@@ -143,6 +143,7 @@ igt at prime_vgem@basic-fence-read
 igt at prime_vgem@basic-gtt
 igt at prime_vgem@basic-read
 igt at prime_vgem@basic-write
+igt at prime_vgem@basic-userptr
 igt at vgem_basic@setversion
 igt at vgem_basic@create
 igt at vgem_basic@debugfs
diff --git a/tests/prime_vgem.c b/tests/prime_vgem.c
index 38e2026aa..bc74d6844 100644
--- a/tests/prime_vgem.c
+++ b/tests/prime_vgem.c
@@ -287,6 +287,34 @@ static void test_write(int vgem, int i915)
 	munmap(ptr, scratch.size);
 }
 
+static void test_userptr(int vgem, int i915)
+{
+	struct vgem_bo scratch;
+	struct drm_i915_gem_exec_object2 obj = {};
+	struct drm_i915_gem_execbuffer2 execbuf = {
+		.buffers_ptr = to_user_pointer(&obj),
+		.buffer_count = 1,
+	};
+	uint32_t *ptr;
+
+	scratch.width = 1024;
+	scratch.height = 1024;
+	scratch.bpp = 32;
+	vgem_create(vgem, &scratch);
+
+	ptr = vgem_mmap(vgem, &scratch, PROT_WRITE);
+	gem_close(vgem, scratch.handle);
+	*ptr = MI_BATCH_BUFFER_END;
+
+	gem_userptr(i915, ptr, scratch.size, 0, 0, &obj.handle);
+	gem_set_caching(i915, obj.handle, I915_CACHING_NONE); /* for exec */
+
+	gem_execbuf(i915, &execbuf);
+	gem_close(i915, obj.handle);
+
+	munmap(ptr, scratch.size);
+}
+
 static void test_gtt(int vgem, int i915)
 {
 	struct vgem_bo scratch;
@@ -1038,6 +1066,9 @@ igt_main
 	igt_subtest("basic-write")
 		test_write(vgem, i915);
 
+	igt_subtest("basic-userptr")
+		test_userptr(vgem, i915);
+
 	igt_subtest("basic-gtt") {
 		gem_require_mappable_ggtt(i915);
 		test_gtt(vgem, i915);
-- 
2.28.0