tests: Add a simple exercise of GTT mmaps

Test copying between 2 mappings and reading/writing from and to.

References: https://bugs.freedesktop.org/show_bug.cgi?id=38115
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

.gitignore

@@ -42,6 +42,7 @@ tests/gem_flink
 tests/gem_gtt_speed
 tests/gem_largeobject
 tests/gem_mmap
+tests/gem_mmap_gtt
 tests/gem_pread_after_blit
 tests/gem_pwrite
 tests/gem_readwrite

tests/Makefile.am

@@ -22,6 +22,7 @@ TESTS = getversion \
 	gem_readwrite \
 	gem_ringfill \
 	gem_mmap \
+	gem_mmap_gtt \
 	gem_pwrite \
 	gem_pread_after_blit \
 	gem_tiled_pread \

tests/gem_mmap_gtt.c

@@ -0,0 +1,186 @@
+/*
+ * Copyright © 2011 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 <stdio.h>
+#include <string.h>
+#include <assert.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <errno.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <sys/mman.h>
+#include "drm.h"
+#include "i915_drm.h"
+#include "drmtest.h"
+
+#define OBJECT_SIZE (16*1024*1024)
+
+static uint32_t gem_create(int fd, int size)
+{
+	struct drm_i915_gem_create create;
+	int ret;
+
+	create.handle = 0;
+	create.size = (size + 4095) & -4096;
+	ret = drmIoctl(fd, DRM_IOCTL_I915_GEM_CREATE, &create);
+	assert(ret == 0);
+
+	return create.handle;
+}
+
+static void gem_write(int fd,
+		      uint32_t handle, uint32_t offset,
+		      const void *src, int length)
+{
+	struct drm_i915_gem_pwrite arg;
+	int ret;
+
+	arg.handle = handle;
+	arg.offset = offset;
+	arg.size = length;
+	arg.data_ptr = (uintptr_t)src;
+
+	ret = drmIoctl(fd, DRM_IOCTL_I915_GEM_PWRITE, &arg);
+	assert(ret == 0);
+}
+
+static void gem_read(int fd,
+		     uint32_t handle, uint32_t offset,
+		     void *dst, int length)
+{
+	struct drm_i915_gem_pread arg;
+	int ret;
+
+	arg.handle = handle;
+	arg.offset = offset;
+	arg.size = length;
+	arg.data_ptr = (uintptr_t)dst;
+
+	ret = drmIoctl(fd, DRM_IOCTL_I915_GEM_PREAD, &arg);
+	assert(ret == 0);
+}
+
+static void gem_close(int fd, uint32_t handle)
+{
+	struct drm_gem_close close;
+	int ret;
+
+	close.handle = handle;
+	ret = drmIoctl(fd, DRM_IOCTL_GEM_CLOSE, &close);
+	assert(ret == 0);
+}
+
+static void *
+create_pointer(int fd)
+{
+	struct drm_i915_gem_mmap_gtt arg;
+	uint32_t handle;
+	void *ptr;
+	int ret;
+
+	memset(&arg, 0, sizeof(arg));
+
+	handle = gem_create(fd, OBJECT_SIZE);
+
+	arg.handle = handle;
+	ret = ioctl(fd, DRM_IOCTL_I915_GEM_MMAP_GTT, &arg);
+	assert(ret == 0);
+
+	ptr = mmap(0, OBJECT_SIZE, PROT_READ | PROT_WRITE,
+		   MAP_SHARED, fd, arg.offset);
+	assert(ptr != MAP_FAILED);
+
+	gem_close(fd, handle);
+
+	return ptr;
+}
+
+static void
+test_copy(int fd)
+{
+	void *src, *dst;
+
+	/* copy from a fresh src to fresh dst to force pagefault on both */
+	src = create_pointer(fd);
+	dst = create_pointer(fd);
+
+	memcpy(dst, src, OBJECT_SIZE);
+	memcpy(src, dst, OBJECT_SIZE);
+
+	munmap(dst, OBJECT_SIZE);
+	munmap(src, OBJECT_SIZE);
+}
+
+static void
+test_write(int fd)
+{
+	void *src;
+	uint32_t dst;
+
+	/* copy from a fresh src to fresh dst to force pagefault on both */
+	src = create_pointer(fd);
+	dst = gem_create(fd, OBJECT_SIZE);
+
+	gem_write(fd, dst, 0, src, OBJECT_SIZE);
+
+	gem_close(fd, dst);
+	munmap(src, OBJECT_SIZE);
+}
+
+static void
+test_read(int fd)
+{
+	void *dst;
+	uint32_t src;
+
+	/* copy from a fresh src to fresh dst to force pagefault on both */
+	dst = create_pointer(fd);
+	src = gem_create(fd, OBJECT_SIZE);
+
+	gem_read(fd, src, 0, dst, OBJECT_SIZE);
+
+	gem_close(fd, src);
+	munmap(dst, OBJECT_SIZE);
+}
+
+int main(int argc, char **argv)
+{
+	int fd;
+
+	fd = drm_open_any();
+
+	test_copy(fd);
+	test_read(fd);
+	test_write(fd);
+
+	close(fd);
+
+	return 0;
+}