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diff --git a/tests/gem_set_tiling_vs_blt.c b/tests/gem_set_tiling_vs_blt.c
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+++ b/tests/gem_set_tiling_vs_blt.c
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+/*
+ * Copyright © 2012 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ * Authors:
+ *    Daniel Vetter <daniel.vetter@ffwll.ch>
+ *
+ */
+
+/** @file gem_set_tiling_vs_blt.c
+ *
+ * Testcase: Check for proper synchronization of tiling changes vs. tiled gpu
+ * access
+ *
+ * The blitter on gen3 and earlier needs properly set up fences. Which also
+ * means that for untiled blits we may not set up a fence before that blt has
+ * finished.
+ *
+ * Current kernels have a bug there, but it's pretty hard to hit because you
+ * need:
+ * - a blt on an untiled object which is aligned correctly for tiling.
+ * - a set_tiling to switch that object to tiling
+ * - another blt without any intervening cpu access that uses this object.
+ *
+ * Testcase has been extended to also check tiled->untiled and tiled->tiled
+ * transitions (i.e. changing stride).
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <assert.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <errno.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+#include <stdbool.h>
+#include "drm.h"
+#include "i915_drm.h"
+#include "drmtest.h"
+#include "intel_bufmgr.h"
+#include "intel_batchbuffer.h"
+#include "intel_gpu_tools.h"
+
+static drm_intel_bufmgr *bufmgr;
+struct intel_batchbuffer *batch;
+uint32_t devid;
+
+#define TEST_SIZE (1024*1024)
+#define TEST_STRIDE (4*1024)
+#define TEST_HEIGHT(stride)	(TEST_SIZE/(stride))
+#define TEST_WIDTH(stride)	((stride)/4)
+
+uint32_t data[TEST_SIZE/4];
+
+static void do_test(uint32_t tiling, unsigned stride,
+		    uint32_t tiling_after, unsigned stride_after)
+{
+	drm_intel_bo *busy_bo, *test_bo, *target_bo;
+	int i, ret;
+	uint32_t *ptr;
+	uint32_t test_bo_handle;
+	uint32_t blt_stride, blt_bits;
+	bool tiling_changed = false;
+
+	printf("filling ring .. ");
+	busy_bo = drm_intel_bo_alloc(bufmgr, "busy bo bo", 16*1024*1024, 4096);
+
+	for (i = 0; i < 250; i++) {
+		BEGIN_BATCH(8);
+		OUT_BATCH(XY_SRC_COPY_BLT_CMD |
+			  XY_SRC_COPY_BLT_WRITE_ALPHA |
+			  XY_SRC_COPY_BLT_WRITE_RGB);
+		OUT_BATCH((3 << 24) | /* 32 bits */
+			  (0xcc << 16) | /* copy ROP */
+			  2*1024*4);
+		OUT_BATCH(0 << 16 | 1024);
+		OUT_BATCH((2048) << 16 | (2048));
+		OUT_RELOC_FENCED(busy_bo, I915_GEM_DOMAIN_RENDER, I915_GEM_DOMAIN_RENDER, 0);
+		OUT_BATCH(0 << 16 | 0);
+		OUT_BATCH(2*1024*4);
+		OUT_RELOC_FENCED(busy_bo, I915_GEM_DOMAIN_RENDER, 0, 0);
+		ADVANCE_BATCH();
+
+		if (IS_GEN6(devid) || IS_GEN7(devid)) {
+			BEGIN_BATCH(3);
+			OUT_BATCH(XY_SETUP_CLIP_BLT_CMD);
+			OUT_BATCH(0);
+			OUT_BATCH(0);
+			ADVANCE_BATCH();
+		}
+	}
+	intel_batchbuffer_flush(batch);
+
+	printf("playing tricks .. ");
+	/* first allocate the target so it gets out of the way of playing funky
+	 * tricks */
+	target_bo = drm_intel_bo_alloc(bufmgr, "target bo", TEST_SIZE, 4096);
+
+	/* allocate buffer with parameters _after_ transition we want to check
+	 * and touch it, so that it's properly aligned in the gtt. */
+	test_bo = drm_intel_bo_alloc(bufmgr, "tiled busy bo", TEST_SIZE, 4096);
+	test_bo_handle = test_bo->handle;
+	ret = drm_intel_bo_set_tiling(test_bo, &tiling_after, stride_after);
+	assert(ret == 0);
+	drm_intel_gem_bo_map_gtt(test_bo);
+	ptr = test_bo->virtual;
+	*ptr = 0;
+	ptr = NULL;
+	drm_intel_gem_bo_unmap_gtt(test_bo);
+
+	drm_intel_bo_unreference(test_bo);
+
+	test_bo = NULL;
+
+	/* note we need a bo bigger than batches, otherwise the buffer reuse
+	 * trick will fail. */
+	test_bo = drm_intel_bo_alloc(bufmgr, "busy bo", TEST_SIZE, 4096);
+	if (test_bo_handle != test_bo->handle)
+		fprintf(stderr, "libdrm reuse trick failed\n");
+	test_bo_handle = test_bo->handle;
+	/* ensure we have the right tiling before we start. */
+	ret = drm_intel_bo_set_tiling(test_bo, &tiling, stride);
+	assert(ret == 0);
+
+	if (tiling == I915_TILING_NONE) {
+		drm_intel_bo_subdata(test_bo, 0, TEST_SIZE, data);
+	} else {
+		drm_intel_gem_bo_map_gtt(test_bo);
+		ptr = test_bo->virtual;
+		memcpy(ptr, data, TEST_SIZE);
+		ptr = NULL;
+		drm_intel_gem_bo_unmap_gtt(test_bo);
+	}
+
+	blt_stride = stride;
+	blt_bits = 0;
+	if (intel_gen(devid) >= 4 && tiling != I915_TILING_NONE) {
+		blt_stride /= 4;
+		blt_bits = XY_SRC_COPY_BLT_SRC_TILED;
+	}
+
+	BEGIN_BATCH(8);
+	OUT_BATCH(XY_SRC_COPY_BLT_CMD |
+		  XY_SRC_COPY_BLT_WRITE_ALPHA |
+		  blt_bits |
+		  XY_SRC_COPY_BLT_WRITE_RGB);
+	OUT_BATCH((3 << 24) | /* 32 bits */
+		  (0xcc << 16) | /* copy ROP */
+		  stride);
+	OUT_BATCH(0 << 16 | 0);
+	OUT_BATCH((TEST_HEIGHT(stride)) << 16 | (TEST_WIDTH(stride)));
+	OUT_RELOC_FENCED(target_bo, I915_GEM_DOMAIN_RENDER, I915_GEM_DOMAIN_RENDER, 0);
+	OUT_BATCH(0 << 16 | 0);
+	OUT_BATCH(blt_stride);
+	OUT_RELOC_FENCED(test_bo, I915_GEM_DOMAIN_RENDER, 0, 0);
+	ADVANCE_BATCH();
+	intel_batchbuffer_flush(batch);
+
+	drm_intel_bo_unreference(test_bo);
+
+	test_bo = drm_intel_bo_alloc_for_render(bufmgr, "tiled busy bo", TEST_SIZE, 4096);
+	if (test_bo_handle != test_bo->handle)
+		fprintf(stderr, "libdrm reuse trick failed\n");
+	ret = drm_intel_bo_set_tiling(test_bo, &tiling_after, stride_after);
+	assert(ret == 0);
+
+	/* Note: We don't care about gen4+ here because the blitter doesn't use
+	 * fences there. So not setting tiling flags on the tiled buffer is ok.
+	 */
+	BEGIN_BATCH(8);
+	OUT_BATCH(XY_SRC_COPY_BLT_CMD |
+		  XY_SRC_COPY_BLT_WRITE_ALPHA |
+		  XY_SRC_COPY_BLT_WRITE_RGB);
+	OUT_BATCH((3 << 24) | /* 32 bits */
+		  (0xcc << 16) | /* copy ROP */
+		  stride_after);
+	OUT_BATCH(0 << 16 | 0);
+	OUT_BATCH((1) << 16 | (1));
+	OUT_RELOC_FENCED(test_bo, I915_GEM_DOMAIN_RENDER, I915_GEM_DOMAIN_RENDER, 0);
+	OUT_BATCH(0 << 16 | 0);
+	OUT_BATCH(stride_after);
+	OUT_RELOC_FENCED(test_bo, I915_GEM_DOMAIN_RENDER, 0, 0);
+	ADVANCE_BATCH();
+	intel_batchbuffer_flush(batch);
+
+	/* Now try to trick the kernel the kernel into changing up the fencing
+	 * too early. */
+
+	printf("checking .. ");
+	memset(data, 0, TEST_SIZE);
+	drm_intel_bo_get_subdata(target_bo, 0, TEST_SIZE, data);
+	for (i = 0; i < TEST_SIZE/4; i++)
+		assert(data[i] == i);
+
+	/* check whether tiling on the test_bo actually changed. */
+	drm_intel_gem_bo_map_gtt(test_bo);
+	ptr = test_bo->virtual;
+	for (i = 0; i < TEST_SIZE/4; i++)
+		if (ptr[i] != data[i])
+			tiling_changed = true;
+	ptr = NULL;
+	drm_intel_gem_bo_unmap_gtt(test_bo);
+	assert(tiling_changed);
+
+	drm_intel_bo_unreference(test_bo);
+	drm_intel_bo_unreference(target_bo);
+	drm_intel_bo_unreference(busy_bo);
+	printf("done\n");
+}
+
+int main(int argc, char **argv)
+{
+	int i, fd;
+	uint32_t tiling, tiling_after;
+
+	for (i = 0; i < 1024*256; i++)
+		data[i] = i;
+
+	fd = drm_open_any();
+
+	bufmgr = drm_intel_bufmgr_gem_init(fd, 4096);
+	drm_intel_bufmgr_gem_enable_reuse(bufmgr);
+	devid = intel_get_drm_devid(fd);
+	batch = intel_batchbuffer_alloc(bufmgr, devid);
+
+
+	printf("testing untiled->tiled transisition:\n");
+	tiling = I915_TILING_NONE;
+	tiling_after = I915_TILING_X;
+	do_test(tiling, TEST_STRIDE, tiling_after, TEST_STRIDE);
+	assert(tiling == I915_TILING_NONE);
+	assert(tiling_after == I915_TILING_X);
+
+	printf("testing tiled->untiled transisition:\n");
+	tiling = I915_TILING_X;
+	tiling_after = I915_TILING_NONE;
+	do_test(tiling, TEST_STRIDE, tiling_after, TEST_STRIDE);
+	assert(tiling == I915_TILING_X);
+	assert(tiling_after == I915_TILING_NONE);
+
+	printf("testing tiled->tiled transisition:\n");
+	tiling = I915_TILING_X;
+	tiling_after = I915_TILING_X;
+	do_test(tiling, TEST_STRIDE/2, tiling_after, TEST_STRIDE);
+	assert(tiling == I915_TILING_X);
+	assert(tiling_after == I915_TILING_X);
+
+	return 0;
+}