1 files changed, 54 insertions, 0 deletions
diff --git a/src/panfrost/encoder/pan_texture.c b/src/panfrost/encoder/pan_texture.c
new file mode 100644
index 00000000000..8e4b00e9055
--- /dev/null
+++ b/src/panfrost/encoder/pan_texture.c
@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2008 VMware, Inc.
+ * Copyright (C) 2014 Broadcom
+ * Copyright (C) 2018-2019 Alyssa Rosenzweig
+ * Copyright (C) 2019-2020 Collabora, Ltd.
+ *
+ * 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.
+ *
+ */
+
+#include "util/macros.h"
+#include "pan_texture.h"
+
+/* Computes sizes for checksumming, which is 8 bytes per 16x16 tile.
+ * Checksumming is believed to be a CRC variant (CRC64 based on the size?).
+ * This feature is also known as "transaction elimination". */
+
+#define CHECKSUM_TILE_WIDTH 16
+#define CHECKSUM_TILE_HEIGHT 16
+#define CHECKSUM_BYTES_PER_TILE 8
+
+unsigned
+panfrost_compute_checksum_size(
+        struct panfrost_slice *slice,
+        unsigned width,
+        unsigned height)
+{
+        unsigned aligned_width = ALIGN_POT(width, CHECKSUM_TILE_WIDTH);
+        unsigned aligned_height = ALIGN_POT(height, CHECKSUM_TILE_HEIGHT);
+
+        unsigned tile_count_x = aligned_width / CHECKSUM_TILE_WIDTH;
+        unsigned tile_count_y = aligned_height / CHECKSUM_TILE_HEIGHT;
+
+        slice->checksum_stride = tile_count_x * CHECKSUM_BYTES_PER_TILE;
+
+        return slice->checksum_stride * tile_count_y;
+}