intel/isl: Add basic modifier introspection

Reviewed-by: Topi Pohjolainen <topi.pohjolainen@intel.com>
Reviewed-by: Chad Versace <chadversary@chromium.org>

src/intel/isl/isl_drm.c

@@ -0,0 +1,59 @@
+/*
+ * Copyright 2017 Intel Corporation
+ *
+ *  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 <assert.h>
+#include <stdlib.h>
+
+#include <drm_fourcc.h>
+
+#include "isl.h"
+#include "common/gen_device_info.h"
+
+struct isl_drm_modifier_info modifier_info[] = {
+   {
+      .modifier = DRM_FORMAT_MOD_NONE,
+      .name = "DRM_FORMAT_MOD_NONE",
+      .tiling = ISL_TILING_LINEAR,
+   },
+   {
+      .modifier = I915_FORMAT_MOD_X_TILED,
+      .name = "I915_FORMAT_MOD_X_TILED",
+      .tiling = ISL_TILING_X,
+   },
+   {
+      .modifier = I915_FORMAT_MOD_Y_TILED,
+      .name = "I915_FORMAT_MOD_Y_TILED",
+      .tiling = ISL_TILING_Y0,
+   },
+};
+
+const struct isl_drm_modifier_info *
+isl_drm_modifier_get_info(uint64_t modifier)
+{
+   for (unsigned i = 0; i < ARRAY_SIZE(modifier_info); i++) {
+      if (modifier_info[i].modifier == modifier)
+         return &modifier_info[i];
+   }
+
+   return NULL;
+}