panfrost: Move checksum routines to root panfrost

These are Gallium-independent and clean code; as is tradition, let's
hoist them up out of the Gallium driver as a bit of yak shaving as we
prepare to untangle the monster that is pan_resource.c

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3858>

7 files changed, 117 insertions, 42 deletions

diff --git a/src/gallium/drivers/panfrost/pan_resource.c b/src/gallium/drivers/panfrost/pan_resource.c
index 483450af9f8..5c90a5e9b4c 100644
--- a/src/gallium/drivers/panfrost/pan_resource.c
+++ b/src/gallium/drivers/panfrost/pan_resource.c
@@ -235,29 +235,6 @@ panfrost_create_scanout_res(struct pipe_screen *screen,
         return res;
 }
 
-/* Computes sizes for checksumming, which is 8 bytes per 16x16 tile */
-
-#define CHECKSUM_TILE_WIDTH 16
-#define CHECKSUM_TILE_HEIGHT 16
-#define CHECKSUM_BYTES_PER_TILE 8
-
-static unsigned
-panfrost_compute_checksum_sizes(
-        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;
-}
-
 /* Setup the mip tree given a particular layout, possibly with checksumming */
 
 static void
@@ -349,7 +326,7 @@ panfrost_setup_slices(struct panfrost_resource *pres, size_t *bo_size)
                 if (pres->checksummed) {
                         slice->checksum_offset = offset;
 
-                        unsigned size = panfrost_compute_checksum_sizes(
+                        unsigned size = panfrost_compute_checksum_size(
                                                 slice, width, height);
 
                         offset += size;
diff --git a/src/gallium/drivers/panfrost/pan_resource.h b/src/gallium/drivers/panfrost/pan_resource.h
index f3ba339add7..2af06208f2c 100644
--- a/src/gallium/drivers/panfrost/pan_resource.h
+++ b/src/gallium/drivers/panfrost/pan_resource.h
@@ -29,27 +29,10 @@
 #include <panfrost-job.h>
 #include "pan_screen.h"
 #include "pan_allocate.h"
+#include "pan_texture.h"
 #include "drm-uapi/drm.h"
 #include "util/u_range.h"
 
-struct panfrost_slice {
-        unsigned offset;
-        unsigned stride;
-        unsigned size0;
-
-        /* If there is a header preceding each slice, how big is
-         * that header?  Used for AFBC */
-        unsigned header_size;
-
-        /* If checksumming is enabled following the slice, what
-         * is its offset/stride? */
-        unsigned checksum_offset;
-        unsigned checksum_stride;
-
-        /* Has anything been written to this slice? */
-        bool initialized;
-};
-
 struct panfrost_resource {
         struct pipe_resource base;
         struct {
diff --git a/src/panfrost/Makefile.sources b/src/panfrost/Makefile.sources
index ea61d42b240..b7314645c1c 100644
--- a/src/panfrost/Makefile.sources
+++ b/src/panfrost/Makefile.sources
@@ -21,6 +21,7 @@ encoder_FILES := \
         encoder/pan_props.c \
         encoder/pan_sampler.c \
         encoder/pan_tiler.c \
+        encoder/pan_texture.c \
         encoder/pan_scratch.c
 
 midgard_FILES := \
diff --git a/src/panfrost/encoder/meson.build b/src/panfrost/encoder/meson.build
index e203e911de8..d1335ab8f02 100644
--- a/src/panfrost/encoder/meson.build
+++ b/src/panfrost/encoder/meson.build
@@ -26,6 +26,7 @@ libpanfrost_encoder_files = files(
   'pan_invocation.c',
   'pan_sampler.c',
   'pan_tiler.c',
+  'pan_texture.c',
   'pan_scratch.c',
   'pan_props.c',
 )
diff --git a/src/panfrost/encoder/pan_encoder.h b/src/panfrost/encoder/pan_encoder.h
index 2f3ab0d10a9..42ec8320acb 100644
--- a/src/panfrost/encoder/pan_encoder.h
+++ b/src/panfrost/encoder/pan_encoder.h
@@ -107,4 +107,6 @@ void panfrost_instance_id(unsigned padded_count, union mali_attr *attr);
 enum mali_func
 panfrost_flip_compare_func(enum mali_func f);
 
+
+
 #endif
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;
+}
diff --git a/src/panfrost/encoder/pan_texture.h b/src/panfrost/encoder/pan_texture.h
new file mode 100644
index 00000000000..54b2e39122e
--- /dev/null
+++ b/src/panfrost/encoder/pan_texture.h
@@ -0,0 +1,57 @@
+/*
+ * 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.
+ *
+ */
+
+#ifndef __PAN_TEXTURE_H
+#define __PAN_TEXTURE_H
+
+#include <stdbool.h>
+
+struct panfrost_slice {
+        unsigned offset;
+        unsigned stride;
+        unsigned size0;
+
+        /* If there is a header preceding each slice, how big is
+         * that header? Used for AFBC */
+        unsigned header_size;
+
+        /* If checksumming is enabled following the slice, what
+         * is its offset/stride? */
+        unsigned checksum_offset;
+        unsigned checksum_stride;
+
+        /* Has anything been written to this slice? */
+        bool initialized;
+};
+
+unsigned
+panfrost_compute_checksum_size(
+        struct panfrost_slice *slice,
+        unsigned width,
+        unsigned height);
+
+#endif