Add gem_bad_reloc

This test feeds a batch containing self-references into the kernel and
checks that the relocation offsets remain as valid GTT addresses. This
is to exercise SNA passing in negative relocation deltas which can hang
the GPU if they wrap around.

References: https://bugs.freedesktop.org/show_bug.cgi?id=78533
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

tests/.gitignore

@@ -14,6 +14,7 @@ gem_bad_address
 gem_bad_batch
 gem_bad_blit
 gem_bad_length
+gem_bad_reloc
 gem_basic
 gem_caching
 gem_close_race

tests/Makefile.sources

@@ -17,6 +17,7 @@ NOUVEAU_TESTS_M = \
 TESTS_progs_M = \
 	core_get_client_auth \
 	drv_suspend \
+	gem_bad_reloc \
 	gem_basic \
 	gem_caching \
 	gem_close_race \

tests/gem_bad_reloc.c

@@ -0,0 +1,116 @@
+/*
+ * 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"
+
+/* 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, uint32_t handle)
+{
+	struct drm_i915_gem_execbuffer2 execbuf;
+	struct drm_i915_gem_exec_object2 gem_exec;
+	struct drm_i915_gem_relocation_entry gem_reloc[1000];
+	uint64_t gtt_max = gem_aperture_size(fd);
+	uint32_t buf[1024];
+	int i;
+
+	memset(&gem_exec, 0, sizeof(gem_exec));
+	gem_exec.handle = handle;
+
+	memset(&execbuf, 0, sizeof(execbuf));
+	execbuf.buffers_ptr = (uintptr_t)&gem_exec;
+	execbuf.buffer_count = 1;
+	execbuf.batch_len = 8;
+
+	do_or_die(drmIoctl(fd,
+			   DRM_IOCTL_I915_GEM_EXECBUFFER2,
+			   &execbuf));
+
+	printf("Found offset %ld for 4k batch\n", (long)gem_exec.offset);
+	igt_require(gem_exec.offset < 16*1024*1024);
+
+	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 = -16*1024*i;
+		gem_reloc[i].target_handle = handle;
+		gem_reloc[i].read_domains = I915_GEM_DOMAIN_COMMAND;
+	}
+
+	gem_exec.relocation_count = 1000;
+	gem_exec.relocs_ptr = (uintptr_t)gem_reloc;
+
+	do_or_die(drmIoctl(fd,
+			   DRM_IOCTL_I915_GEM_EXECBUFFER2,
+			   &execbuf));
+
+	gem_read(fd, handle, 0, buf, sizeof(buf));
+	for (i = 0; i < sizeof(gem_reloc)/sizeof(gem_reloc[0]); i++)
+		igt_assert(buf[2 + i] < gtt_max);
+
+	return 0;
+}
+
+uint32_t batch[2] = {MI_BATCH_BUFFER_END};
+uint32_t handle;
+int fd;
+
+igt_main
+{
+	igt_fixture {
+		fd = drm_open_any();
+
+		handle = gem_create(fd, 4096);
+		gem_write(fd, handle, 0, batch, sizeof(batch));
+	}
+
+	igt_subtest("negative-reloc")
+		negative_reloc(fd, handle);
+
+	igt_fixture {
+		gem_close(fd, handle);
+
+		close(fd);
+	}
+}