Import simple drm memory manager.

This is required for the VIA driver and at least some parts are needed
for GEM.

MFC after:	2 weeks

1 files changed, 100 insertions, 0 deletions

diff --git a/sys/dev/drm/drm_mm.h b/sys/dev/drm/drm_mm.h
new file mode 100644
index 000000000000..f7479cdc1f40
--- /dev/null
+++ b/sys/dev/drm/drm_mm.h
@@ -0,0 +1,100 @@
+/**************************************************************************
+ *
+ * Copyright 2006-2008 Tungsten Graphics, Inc., Cedar Park, TX. USA.
+ * All Rights Reserved.
+ *
+ * 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, sub license, 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 NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS 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 <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+/*
+ * Authors:
+ * Thomas Hellstrom <thomas-at-tungstengraphics-dot-com>
+ */
+
+#ifndef _DRM_MM_H_
+#define _DRM_MM_H_
+
+#include "dev/drm/drm_linux_list.h"
+
+struct drm_mm_node {
+	struct list_head fl_entry;
+	struct list_head ml_entry;
+	int free;
+	unsigned long start;
+	unsigned long size;
+	struct drm_mm *mm;
+	void *private;
+};
+
+struct drm_mm {
+	struct list_head fl_entry;
+	struct list_head ml_entry;
+	struct list_head unused_nodes;
+	int num_unused;
+	struct mtx unused_lock;
+};
+
+/*
+ * Basic range manager support (drm_mm.c)
+ */
+extern struct drm_mm_node *drm_mm_get_block_generic(struct drm_mm_node *node,
+						    unsigned long size,
+						    unsigned alignment,
+						    int atomic);
+static inline struct drm_mm_node *drm_mm_get_block(struct drm_mm_node *parent,
+						   unsigned long size,
+						   unsigned alignment)
+{
+	return drm_mm_get_block_generic(parent, size, alignment, 0);
+}
+static inline struct drm_mm_node *drm_mm_get_block_atomic(struct drm_mm_node *parent,
+							  unsigned long size,
+							  unsigned alignment)
+{
+	return drm_mm_get_block_generic(parent, size, alignment, 1);
+}
+extern void drm_mm_put_block(struct drm_mm_node *cur);
+extern struct drm_mm_node *drm_mm_search_free(const struct drm_mm *mm,
+					      unsigned long size,
+					      unsigned alignment,
+					      int best_match);
+extern int drm_mm_init(struct drm_mm *mm, unsigned long start,
+		       unsigned long size);
+extern void drm_mm_takedown(struct drm_mm *mm);
+extern int drm_mm_clean(struct drm_mm *mm);
+extern unsigned long drm_mm_tail_space(struct drm_mm *mm);
+extern int drm_mm_remove_space_from_tail(struct drm_mm *mm,
+					 unsigned long size);
+extern int drm_mm_add_space_to_tail(struct drm_mm *mm,
+				    unsigned long size, int atomic);
+extern int drm_mm_pre_get(struct drm_mm *mm);
+
+static inline struct drm_mm *drm_get_mm(struct drm_mm_node *block)
+{
+	return block->mm;
+}
+
+#endif