[igt-dev] [PATCH i-g-t v6 03/22] lib/igt_fb: Refactor create_bo_for_fb to prepare for VC4 support

[Paul Kocialkowski]

The current create_bo_for_fb uses a device-specific BO instead of dumb
allocation when dumb allocation is not appropriate and the driver is
Intel. Then, it will assert that the parameters are appropriate for
dumb allocation.

The conditions related to tiling, size and stride are sufficient for
needing a device-specific BO and they are not specific to Intel.
However, a device-specific BO for YUV is only needed for Intel.

Change the conditions accordingly and set a device_bo variable. This
variable allows making fb->size calculation common between the
device-specific and dumb paths. Use the variable after that and
distinguish between the device types for allocating and error out if
it's not supported.

This makes the extra checks that dumb allocation is valid redundant,
since these cases will always fall under device-specific allocation
and potentially error out then.

Signed-off-by: Paul Kocialkowski <paul.kocialkowski at bootlin.com>
Reviewed-by: Maxime Ripard <maxime.ripard at bootlin.com>
Reviewed-by: Lyude Paul <lyude at redhat.com>
---
 lib/igt_fb.c | 45 +++++++++++++++++++++++++--------------------
 1 file changed, 25 insertions(+), 20 deletions(-)

diff --git a/lib/igt_fb.c b/lib/igt_fb.c
index 058cfab604b8..1178dddf2337 100644
--- a/lib/igt_fb.c
+++ b/lib/igt_fb.c
@@ -610,36 +610,41 @@ static int create_bo_for_fb(struct igt_fb *fb)
 	unsigned int bpp = 0;
 	unsigned int plane;
 	unsigned *strides = &fb->strides[0];
+	bool device_bo = false;
 	int fd = fb->fd;
+	uint64_t size;
 
-	if (is_i915_device(fd) &&
-	   (fb->tiling || fb->size || fb->strides[0] || igt_format_is_yuv(fb->drm_format))) {
-		uint64_t size;
+	/*
+	 * The current dumb buffer allocation API doesn't really allow to
+	 * specify a custom size or stride. Yet the caller is free to specify
+	 * them, so we need to make sure to use a device BO then.
+	 */
+	if (fb->tiling || fb->size || fb->strides[0] ||
+	    (is_i915_device(fd) && igt_format_is_yuv(fb->drm_format)))
+		device_bo = true;
 
-		size = calc_fb_size(fb);
+	/* Sets offets and stride if necessary. */
+	size = calc_fb_size(fb);
 
-		/* respect the size requested by the caller */
-		if (fb->size == 0)
-			fb->size = size;
+	/* Respect the size requested by the caller. */
+	if (fb->size == 0)
+		fb->size = size;
 
+	if (device_bo) {
 		fb->is_dumb = false;
-		fb->gem_handle = gem_create(fd, fb->size);
-		gem_set_tiling(fd, fb->gem_handle,
-			       igt_fb_mod_to_tiling(fb->tiling),
-			       fb->strides[0]);
+
+		if (is_i915_device(fd)) {
+			fb->gem_handle = gem_create(fd, fb->size);
+			gem_set_tiling(fd, fb->gem_handle,
+				       igt_fb_mod_to_tiling(fb->tiling),
+				       fb->strides[0]);
+		} else {
+			igt_assert(false);
+		}
 
 		goto out;
 	}
 
-	/*
-	 * The current dumb buffer allocation API doesn't really allow to
-	 * specify a custom size or stride. Yet the caller is free to specify
-	 * them, so we need to make sure to error out in this case.
-	 */
-	igt_assert(fb->size == 0);
-	igt_assert(fb->strides[0] == 0);
-
-	fb->size = calc_fb_size(fb);
 	for (plane = 0; plane < fb->num_planes; plane++)
 		bpp += DIV_ROUND_UP(fb->plane_bpp[plane],
 				    plane ? fmt->hsub * fmt->vsub : 1);
-- 
2.20.1