freedreno: core buffer modifier support

Split out of a patch from Fritz Koenig to decouple from a6xx UBWC
enablement, and added fd_resource_create_with_modifiers().

src/gallium/drivers/freedreno/freedreno_resource.c

@@ -43,6 +43,7 @@
 #include "freedreno_query_hw.h"
 #include "freedreno_util.h"
 
+#include <drm_fourcc.h>
 #include <errno.h>
 
 /* XXX this should go away, needed for 'struct winsys_handle' */
@@ -810,12 +811,26 @@ has_depth(enum pipe_format format)
 	}
 }
 
+static bool
+find_modifier(uint64_t needle, const uint64_t *haystack, int count)
+{
+	int i;
+
+	for (i = 0; i < count; i++) {
+		if (haystack[i] == needle)
+			return true;
+	}
+
+	return false;
+}
+
 /**
  * Create a new texture object, using the given template info.
  */
 static struct pipe_resource *
-fd_resource_create(struct pipe_screen *pscreen,
-		const struct pipe_resource *tmpl)
+fd_resource_create_with_modifiers(struct pipe_screen *pscreen,
+		const struct pipe_resource *tmpl,
+		const uint64_t *modifiers, int count)
 {
 	struct fd_screen *screen = fd_screen(pscreen);
 	struct fd_resource *rsc = CALLOC_STRUCT(fd_resource);
@@ -840,10 +855,25 @@ fd_resource_create(struct pipe_screen *pscreen,
 	 PIPE_BIND_LINEAR  | \
 	 PIPE_BIND_DISPLAY_TARGET)
 
+	bool linear = find_modifier(DRM_FORMAT_MOD_LINEAR, modifiers, count);
+	if (tmpl->bind & LINEAR)
+		linear = true;
+
+	/* Normally, for non-shared buffers, allow buffer compression if
+	 * not shared, otherwise only allow if QCOM_COMPRESSED modifier
+	 * is requested:
+	 *
+	 * TODO we should probably also limit tiled in a similar way,
+	 * except we don't have a format modifier for tiled.  (We probably
+	 * should.)
+	 */
+	bool allow_ubwc = find_modifier(DRM_FORMAT_MOD_INVALID, modifiers, count);
+	if (tmpl->bind & PIPE_BIND_SHARED)
+		allow_ubwc = find_modifier(DRM_FORMAT_MOD_QCOM_COMPRESSED, modifiers, count);
+
 	if (screen->tile_mode &&
 			(tmpl->target != PIPE_BUFFER) &&
-			(tmpl->bind & PIPE_BIND_SAMPLER_VIEW) &&
-			!(tmpl->bind & LINEAR)) {
+			!linear) {
 		rsc->tile_mode = screen->tile_mode(tmpl);
 	}
 
@@ -888,6 +918,9 @@ fd_resource_create(struct pipe_screen *pscreen,
 
 	size = screen->setup_slices(rsc);
 
+	if (allow_ubwc && screen->fill_ubwc_buffer_sizes && rsc->tile_mode)
+		size += screen->fill_ubwc_buffer_sizes(rsc);
+
 	/* special case for hw-query buffer, which we need to allocate before we
 	 * know the size:
 	 */
@@ -912,6 +945,34 @@ fail:
 	return NULL;
 }
 
+static struct pipe_resource *
+fd_resource_create(struct pipe_screen *pscreen,
+		const struct pipe_resource *tmpl)
+{
+	const uint64_t mod = DRM_FORMAT_MOD_INVALID;
+	return fd_resource_create_with_modifiers(pscreen, tmpl, &mod, 1);
+}
+
+static bool
+is_supported_modifier(struct pipe_screen *pscreen, enum pipe_format pfmt,
+		uint64_t mod)
+{
+	int count;
+
+	/* Get the count of supported modifiers: */
+	pscreen->query_dmabuf_modifiers(pscreen, pfmt, 0, NULL, NULL, &count);
+
+	/* Get the supported modifiers: */
+	uint64_t modifiers[count];
+	pscreen->query_dmabuf_modifiers(pscreen, pfmt, 0, modifiers, NULL, &count);
+
+	for (int i = 0; i < count; i++)
+		if (modifiers[i] == mod)
+			return true;
+
+	return false;
+}
+
 /**
  * Create a texture from a winsys_handle. The handle is often created in
  * another process by first creating a pipe texture and then calling
@@ -922,6 +983,7 @@ fd_resource_from_handle(struct pipe_screen *pscreen,
 		const struct pipe_resource *tmpl,
 		struct winsys_handle *handle, unsigned usage)
 {
+	struct fd_screen *screen = fd_screen(pscreen);
 	struct fd_resource *rsc = CALLOC_STRUCT(fd_resource);
 	struct fd_resource_slice *slice = &rsc->slices[0];
 	struct pipe_resource *prsc = &rsc->base;
@@ -960,6 +1022,19 @@ fd_resource_from_handle(struct pipe_screen *pscreen,
 			(slice->pitch & (pitchalign - 1)))
 		goto fail;
 
+	if (handle->modifier == DRM_FORMAT_MOD_QCOM_COMPRESSED) {
+		if (!is_supported_modifier(pscreen, tmpl->format,
+				DRM_FORMAT_MOD_QCOM_COMPRESSED)) {
+			DBG("bad modifier: %lx", handle->modifier);
+			goto fail;
+		}
+		debug_assert(screen->fill_ubwc_buffer_sizes);
+		screen->fill_ubwc_buffer_sizes(rsc);
+	} else if (handle->modifier &&
+			(handle->modifier != DRM_FORMAT_MOD_INVALID)) {
+		goto fail;
+	}
+
 	assert(rsc->cpp);
 
 	return prsc;
@@ -1131,6 +1206,10 @@ fd_resource_screen_init(struct pipe_screen *pscreen)
 	bool fake_rgtc = screen->gpu_id < 400;
 
 	pscreen->resource_create = u_transfer_helper_resource_create;
+	/* NOTE: u_transfer_helper does not yet support the _with_modifiers()
+	 * variant:
+	 */
+	pscreen->resource_create_with_modifiers = fd_resource_create_with_modifiers;
 	pscreen->resource_from_handle = fd_resource_from_handle;
 	pscreen->resource_get_handle = fd_resource_get_handle;
 	pscreen->resource_destroy = u_transfer_helper_resource_destroy;

src/gallium/drivers/freedreno/freedreno_screen.h

@@ -87,6 +87,7 @@ struct fd_screen {
 	 */
 	struct fd_pipe *pipe;
 
+	uint32_t (*fill_ubwc_buffer_sizes)(struct fd_resource *rsc);
 	uint32_t (*setup_slices)(struct fd_resource *rsc);
 	unsigned (*tile_mode)(const struct pipe_resource *prsc);