1 files changed, 55 insertions, 0 deletions
diff --git a/include/drm/ttm/ttm_caching.h b/include/drm/ttm/ttm_caching.h
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index 000000000000..235a743d90e1
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+++ b/include/drm/ttm/ttm_caching.h
@@ -0,0 +1,55 @@
+/*
+ * Copyright 2020 Advanced Micro Devices, Inc.
+ *
+ * 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 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 COPYRIGHT HOLDER(S) OR AUTHOR(S) 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.
+ *
+ * Authors: Christian König
+ */
+
+#ifndef _TTM_CACHING_H_
+#define _TTM_CACHING_H_
+
+#define TTM_NUM_CACHING_TYPES	3
+
+/**
+ * enum ttm_caching - CPU caching and BUS snooping behavior.
+ */
+enum ttm_caching {
+	/**
+	 * @ttm_uncached: Most defensive option for device mappings,
+	 * don't even allow write combining.
+	 */
+	ttm_uncached,
+
+	/**
+	 * @ttm_write_combined: Don't cache read accesses, but allow at least
+	 * writes to be combined.
+	 */
+	ttm_write_combined,
+
+	/**
+	 * @ttm_cached: Fully cached like normal system memory, requires that
+	 * devices snoop the CPU cache on accesses.
+	 */
+	ttm_cached
+};
+
+pgprot_t ttm_prot_from_caching(enum ttm_caching caching, pgprot_t tmp);
+
+#endif