lib: Add wrapper for DRM_IOCTL_MODE_CREATE_DUMB

In order to test drivers that don't have support for proper buffer
objects, add a wrapper for creating dumb buffer objects that will be
called from the lib code for those subtests that don't need to care.

Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Reviewed-by: Daniel Stone <daniels@collabora.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>

lib/igt_kms.c

@@ -426,6 +426,42 @@ uint32_t kmstest_find_crtc_for_connector(int fd, drmModeRes *res,
 	igt_assert(false);
 }
 
+/**
+ * kmstest_dumb_create:
+ * @fd: open drm file descriptor
+ * @width: width of the buffer in pixels
+ * @height: height of the buffer in pixels
+ * @bpp: bytes per pixel of the buffer
+ *
+ * This wraps the CREATE_DUMB ioctl, which allocates a new dumb buffer object
+ * for the specified dimensions.
+ *
+ * Returns: The file-private handle of the created buffer object
+ */
+uint32_t kmstest_dumb_create(int fd, int width, int height, int bpp,
+			     unsigned *stride, unsigned *size)
+{
+	struct drm_mode_create_dumb create;
+
+	memset(&create, 0, sizeof(create));
+	create.width = width;
+	create.height = height;
+	create.bpp = bpp;
+
+	create.handle = 0;
+	do_ioctl(fd, DRM_IOCTL_MODE_CREATE_DUMB, &create);
+	igt_assert(create.handle);
+	igt_assert(create.size >= width * height * bpp / 8);
+
+	if (stride)
+		*stride = create.pitch;
+
+	if (size)
+		*size = create.size;
+
+	return create.handle;
+}
+
 /*
  * Returns: the previous mode, or KD_GRAPHICS if no /dev/tty0 was
  * found and nothing was done.

lib/igt_kms.h

@@ -175,6 +175,9 @@ uint32_t kmstest_find_crtc_for_connector(int fd, drmModeRes *res,
 					 drmModeConnector *connector,
 					 uint32_t crtc_blacklist_idx_mask);
 
+uint32_t kmstest_dumb_create(int fd, int width, int height, int bpp,
+			     unsigned *stride, unsigned *size);
+
 /*
  * A small modeset API
  */

tests/drm_read.c

@@ -120,20 +120,6 @@ static void test_invalid_buffer(int in)
 	teardown(fd);
 }
 
-static uint32_t dumb_create(int fd)
-{
-	struct drm_mode_create_dumb arg;
-
-	arg.bpp = 32;
-	arg.width = 32;
-	arg.height = 32;
-
-	do_ioctl(fd, DRM_IOCTL_MODE_CREATE_DUMB, &arg);
-	igt_assert(arg.size >= 4096);
-
-	return arg.handle;
-}
-
 static void test_fault_buffer(int in)
 {
 	int fd = setup(in, 0);
@@ -141,7 +127,7 @@ static void test_fault_buffer(int in)
 	char *buf;
 
 	memset(&arg, 0, sizeof(arg));
-	arg.handle = dumb_create(fd);
+	arg.handle = kmstest_dumb_create(fd, 32, 32, 32, NULL, NULL);
 
 	do_ioctl(fd, DRM_IOCTL_MODE_MAP_DUMB, &arg);
 

tests/gem_exec_blt.c

@@ -170,22 +170,6 @@ static const char *bytes_per_sec(char *buf, double v)
 	return buf;
 }
 
-static uint32_t dumb_create(int fd)
-{
-	struct drm_mode_create_dumb arg;
-	int ret;
-
-	arg.bpp = 32;
-	arg.width = 32;
-	arg.height = 32;
-
-	ret = drmIoctl(fd, DRM_IOCTL_MODE_CREATE_DUMB, &arg);
-	igt_assert_eq(ret, 0);
-	igt_assert(arg.size >= 4096);
-
-	return arg.handle;
-}
-
 static int dcmp(const void *A, const void *B)
 {
 	const double *a = A, *b = B;
@@ -209,7 +193,7 @@ static void run(int object_size, bool dumb)
 
 	fd = drm_open_driver(DRIVER_INTEL);
 	if (dumb)
-		handle = dumb_create(fd);
+		handle = kmstest_dumb_create(fd, 32, 32, 32, NULL, NULL);
 	else
 		handle = gem_create(fd, 4096);