[Intel-gfx] [PATCH 4/4] igt/gem_stolen: Verify contents of stolen-backed objects across hibernation

[ankitprasad.r.sharma at intel.com]

From: Ankitprasad Sharma <ankitprasad.r.sharma at intel.com>

This patch verifies if the contents of the stolen backed object were
preserved across hibernation. This is to validate kernel changes related
to moving stolen-backed objects to shmem on hibernation.

Signed-off-by: Ankitprasad Sharma <ankitprasad.r.sharma at intel.com>
---
 tests/gem_stolen.c | 86 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 86 insertions(+)

diff --git a/tests/gem_stolen.c b/tests/gem_stolen.c
index 3374716..1f13fb0 100644
--- a/tests/gem_stolen.c
+++ b/tests/gem_stolen.c
@@ -290,6 +290,89 @@ static void stolen_fill_purge_test(int fd)
 		gem_close(fd, handle[i]);
 }
 
+static void stolen_hibernate(int fd)
+{
+	drm_intel_bo *bo;
+	drm_intel_bo *src, *dest;
+	int obj_count = 0, i = 0;
+	int _ret = 0, j = 0;
+	uint32_t handle[MAX_OBJECTS], src_handle;
+	uint32_t *virt;
+
+	gem_require_stolen_support(fd);
+
+	src_handle = gem_create(fd, SIZE);
+	igt_assert(!src_handle);
+	src = gem_handle_to_libdrm_bo(bufmgr, fd,
+				     "bo", src_handle);
+	igt_assert(src != NULL);
+
+	_ret = drm_intel_gem_bo_map_gtt(src);
+	igt_assert(!_ret);
+
+	virt = src->virtual;
+	for (j = 0; j < SIZE/DWORD_SIZE; j++)
+		virt[j] = DATA;
+
+	drm_intel_bo_unmap(src);
+	/* Exhaust Stolen space */
+	do {
+		handle[i] = __gem_create_stolen(fd, SIZE);
+		if (handle[i] != 0) {
+			bo = gem_handle_to_libdrm_bo(bufmgr, fd,
+						     "verify_bo", handle[i]);
+			igt_assert(bo != NULL);
+			_ret = drm_intel_gem_bo_map_gtt(bo);
+			igt_assert(!_ret);
+
+			virt = bo->virtual;
+			for (j = 0; j < SIZE/DWORD_SIZE; j++)
+				igt_assert(!virt[j]);
+
+			drm_intel_bo_unmap(bo);
+			drm_intel_bo_unreference(bo);
+
+			obj_count++;
+		}
+
+		i++;
+	} while (handle[i-1] && i < MAX_OBJECTS);
+
+	igt_assert(obj_count > 0);
+
+	for (i = 0; i < obj_count; i++) {
+		dest = gem_handle_to_libdrm_bo(bufmgr, fd,
+					       "dst_bo", handle[i]);
+		igt_assert(dest != NULL);
+		intel_copy_bo(batch, dest, src, SIZE);
+		drm_intel_bo_unreference(dest);
+	}
+
+	drm_intel_bo_unreference(src);
+
+	igt_system_hibernate_autoresume();
+	/* Check if the object's memory contents are intact
+	 * across hibernation.
+	 */
+	for (i = 0; i < obj_count; i++) {
+		bo = gem_handle_to_libdrm_bo(bufmgr, fd,
+					     "verify_bo", handle[i]);
+		igt_assert(bo != NULL);
+		_ret = drm_intel_gem_bo_map_gtt(bo);
+		igt_assert(!_ret);
+		virt = bo->virtual;
+		for (j = 0; j < SIZE/DWORD_SIZE; j++)
+			igt_assert_eq(virt[j], DATA);
+
+		drm_intel_bo_unmap(bo);
+		drm_intel_bo_unreference(bo);
+	}
+
+	gem_close(fd, src_handle);
+	for (i = 0; i < obj_count; i++)
+		gem_close(fd, handle[i]);
+}
+
 static void
 stolen_no_mmap(int fd)
 {
@@ -353,6 +436,9 @@ igt_main
 	igt_subtest("stolen-fill-purge")
 		stolen_fill_purge_test(fd);
 
+	igt_subtest("stolen-hibernate")
+		stolen_hibernate(fd);
+
 	igt_fixture {
 		intel_batchbuffer_free(batch);
 		drm_intel_bufmgr_destroy(bufmgr);
-- 
1.9.1