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Diffstat (limited to 'include/drm/ttm/ttm_caching.h')
-rw-r--r--include/drm/ttm/ttm_caching.h17
1 files changed, 17 insertions, 0 deletions
diff --git a/include/drm/ttm/ttm_caching.h b/include/drm/ttm/ttm_caching.h
index 3c9dd65f5aaf..235a743d90e1 100644
--- a/include/drm/ttm/ttm_caching.h
+++ b/include/drm/ttm/ttm_caching.h
@@ -27,9 +27,26 @@
#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
};