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diff --git a/tests/i915/gem_tiled_pread_pwrite.c b/tests/i915/gem_tiled_pread_pwrite.c
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+++ b/tests/i915/gem_tiled_pread_pwrite.c
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+/*
+ * Copyright © 2009 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:
+ *    Eric Anholt <eric@anholt.net>
+ *
+ */
+
+/** @file gem_tiled_pread_pwrite.c
+ *
+ * This is a test of pread's behavior on tiled objects with respect to the
+ * reported swizzling value.
+ *
+ * The goal is to exercise the slow_bit17_copy path for reading on bit17
+ * machines, but will also be useful for catching swizzling value bugs on
+ * other systems.
+ */
+
+/*
+ * Testcase: Test swizzling by testing pwrite does the inverse of pread
+ *
+ * Together with the explicit pread testcase, this should cover our swizzle
+ * handling.
+ *
+ * Note that this test will use swap in an effort to test all of ram.
+ */
+
+#include "igt.h"
+#include "igt_x86.h"
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <errno.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+#include <sys/ioctl.h>
+
+#include <drm.h>
+
+
+IGT_TEST_DESCRIPTION("Test swizzling by testing pwrite does the inverse of"
+		     " pread.");
+
+#define WIDTH 512
+#define HEIGHT 512
+static uint32_t linear[WIDTH * HEIGHT];
+static uint32_t current_tiling_mode;
+
+#define PAGE_SIZE 4096
+
+static uint32_t
+create_bo_and_fill(int fd)
+{
+	uint32_t handle;
+	uint32_t *data;
+	int i;
+
+	handle = gem_create(fd, sizeof(linear));
+	gem_set_tiling(fd, handle, current_tiling_mode, WIDTH * sizeof(uint32_t));
+
+	/* Fill the BO with dwords starting at start_val */
+	data = gem_mmap__gtt(fd, handle, sizeof(linear),
+			     PROT_READ | PROT_WRITE);
+	for (i = 0; i < WIDTH*HEIGHT; i++)
+		data[i] = i;
+	munmap(data, sizeof(linear));
+
+	return handle;
+}
+
+static uint32_t
+create_bo(int fd)
+{
+	uint32_t handle;
+
+	handle = gem_create(fd, sizeof(linear));
+	gem_set_tiling(fd, handle, current_tiling_mode, WIDTH * sizeof(uint32_t));
+
+	return handle;
+}
+
+static void copy_wc_page(void *dst, const void *src)
+{
+	igt_memcpy_from_wc(dst, src, PAGE_SIZE);
+}
+
+igt_simple_main
+{
+	uint32_t tiling, swizzle;
+	int count;
+	int fd;
+	
+	fd = drm_open_driver(DRIVER_INTEL);
+	count = SLOW_QUICK(intel_get_total_ram_mb() * 9 / 10, 8) ;
+
+	for (int i = 0; i < count/2; i++) {
+		uint32_t handle, handle_target;
+		char *data;
+		int n;
+
+		current_tiling_mode = I915_TILING_X;
+
+		handle = create_bo_and_fill(fd);
+		gem_get_tiling(fd, handle, &tiling, &swizzle);
+
+		gem_read(fd, handle, 0, linear, sizeof(linear));
+
+		handle_target = create_bo(fd);
+		gem_write(fd, handle_target, 0, linear, sizeof(linear));
+
+		/* Check the target bo's contents. */
+		data = gem_mmap__gtt(fd, handle_target, sizeof(linear), PROT_READ);
+		n = 0;
+		for (int pfn = 0; pfn < sizeof(linear)/PAGE_SIZE; pfn++) {
+			uint32_t page[PAGE_SIZE/sizeof(uint32_t)];
+			copy_wc_page(page, data + PAGE_SIZE*pfn);
+			for (int j = 0; j < PAGE_SIZE/sizeof(uint32_t); j++) {
+				igt_assert_f(page[j] == n,
+					     "mismatch at %i: %i\n",
+					     n, page[j]);
+				n++;
+			}
+		}
+		munmap(data, sizeof(linear));
+
+		/* Leak both bos so that we use all of system mem! */
+		gem_madvise(fd, handle_target, I915_MADV_DONTNEED);
+		gem_madvise(fd, handle, I915_MADV_DONTNEED);
+
+		igt_progress("gem_tiled_pread_pwrite: ", i, count/2);
+	}
+
+	close(fd);
+}