1 files changed, 137 insertions, 0 deletions
diff --git a/tests/gem_bad_reloc.c b/tests/gem_bad_reloc.c
new file mode 100644
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--- /dev/null
+++ b/tests/gem_bad_reloc.c
@@ -0,0 +1,137 @@
+/*
+ * Copyright © 2014 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:
+ *    Chris Wilson <chris@chris-wilson.co.uk>
+ *
+ */
+
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <errno.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <sys/time.h>
+#include "drm.h"
+#include "ioctl_wrappers.h"
+#include "drmtest.h"
+#include "intel_io.h"
+#include "intel_chipset.h"
+
+#define USE_LUT (1 << 12)
+
+/* Simulates SNA behaviour using negative self-relocations for
+ * STATE_BASE_ADDRESS command packets. If they wrap around (to values greater
+ * than the total size of the GTT), the GPU will hang.
+ * See https://bugs.freedesktop.org/show_bug.cgi?id=78533
+ */
+static int negative_reloc(int fd, unsigned flags)
+{
+	struct drm_i915_gem_execbuffer2 execbuf;
+	struct drm_i915_gem_exec_object2 gem_exec[2];
+	struct drm_i915_gem_relocation_entry gem_reloc[1000];
+	uint64_t gtt_max = gem_aperture_size(fd);
+	uint32_t buf[1024] = {MI_BATCH_BUFFER_END};
+	int i;
+
+#define BIAS (256*1024)
+
+	igt_require(intel_gen(intel_get_drm_devid(fd)) >= 7);
+
+	memset(gem_exec, 0, sizeof(gem_exec));
+	gem_exec[0].handle = gem_create(fd, 4096);
+	gem_write(fd, gem_exec[0].handle, 0, buf, 8);
+
+	gem_reloc[0].offset = 1024;
+	gem_reloc[0].delta = 0;
+	gem_reloc[0].target_handle = gem_exec[0].handle;
+	gem_reloc[0].read_domains = I915_GEM_DOMAIN_COMMAND;
+
+	gem_exec[1].handle = gem_create(fd, 4096);
+	gem_write(fd, gem_exec[1].handle, 0, buf, 8);
+	gem_exec[1].relocation_count = 1;
+	gem_exec[1].relocs_ptr = (uintptr_t)gem_reloc;
+
+	memset(&execbuf, 0, sizeof(execbuf));
+	execbuf.buffers_ptr = (uintptr_t)gem_exec;
+	execbuf.buffer_count = 2;
+	execbuf.batch_len = 8;
+
+	do_or_die(drmIoctl(fd,
+			   DRM_IOCTL_I915_GEM_EXECBUFFER2,
+			   &execbuf));
+	gem_close(fd, gem_exec[1].handle);
+
+	printf("Found offset %ld for 4k batch\n", (long)gem_exec[0].offset);
+	igt_require(gem_exec[0].offset < BIAS);
+
+	memset(gem_reloc, 0, sizeof(gem_reloc));
+	for (i = 0; i < sizeof(gem_reloc)/sizeof(gem_reloc[0]); i++) {
+		gem_reloc[i].offset = 8 + 4*i;
+		gem_reloc[i].delta = -BIAS*i/1024;
+		gem_reloc[i].target_handle = flags & USE_LUT ? 0 : gem_exec[0].handle;
+		gem_reloc[i].read_domains = I915_GEM_DOMAIN_COMMAND;
+	}
+
+	gem_exec[0].relocation_count = sizeof(gem_reloc)/sizeof(gem_reloc[0]);
+	gem_exec[0].relocs_ptr = (uintptr_t)gem_reloc;
+
+	execbuf.buffer_count = 1;
+	execbuf.flags = flags & USE_LUT;
+	do_or_die(drmIoctl(fd,
+			   DRM_IOCTL_I915_GEM_EXECBUFFER2,
+			   &execbuf));
+
+	printf("Batch is now at offset %ld\n", (long)gem_exec[0].offset);
+
+	gem_read(fd, gem_exec[0].handle, 0, buf, sizeof(buf));
+	gem_close(fd, gem_exec[0].handle);
+
+	for (i = 0; i < sizeof(gem_reloc)/sizeof(gem_reloc[0]); i++)
+		igt_assert(buf[2 + i] < gtt_max);
+
+	return 0;
+}
+
+int fd;
+
+igt_main
+{
+	igt_fixture {
+		fd = drm_open_any();
+	}
+
+	igt_subtest("negative-reloc")
+		negative_reloc(fd, 0);
+
+	igt_subtest("negative-reloc-lut")
+		negative_reloc(fd, USE_LUT);
+
+	igt_fixture {
+		close(fd);
+	}
+}