1 /* SPDX-License-Identifier: MIT */
2 /*
3  * Copyright © 2021 Intel Corporation
4  */
5 
6 #ifndef __I915_TTM_BUDDY_MANAGER_H__
7 #define __I915_TTM_BUDDY_MANAGER_H__
8 
9 #include <linux/list.h>
10 #include <linux/types.h>
11 
12 #include <drm/ttm/ttm_resource.h>
13 
14 struct ttm_device;
15 struct ttm_resource_manager;
16 struct drm_buddy;
17 
18 /**
19  * struct i915_ttm_buddy_resource
20  *
21  * @base: struct ttm_resource base class we extend
22  * @blocks: the list of struct i915_buddy_block for this resource/allocation
23  * @flags: DRM_BUDDY_*_ALLOCATION flags
24  * @used_visible_size: How much of this resource, if any, uses the CPU visible
25  * portion, in pages.
26  * @mm: the struct i915_buddy_mm for this resource
27  *
28  * Extends the struct ttm_resource to manage an address space allocation with
29  * one or more struct i915_buddy_block.
30  */
31 struct i915_ttm_buddy_resource {
32 	struct ttm_resource base;
33 	struct list_head blocks;
34 	unsigned long flags;
35 	unsigned long used_visible_size;
36 	struct drm_buddy *mm;
37 };
38 
39 /**
40  * to_ttm_buddy_resource
41  *
42  * @res: the resource to upcast
43  *
44  * Upcast the struct ttm_resource object into a struct i915_ttm_buddy_resource.
45  */
46 static inline struct i915_ttm_buddy_resource *
47 to_ttm_buddy_resource(struct ttm_resource *res)
48 {
49 	return container_of(res, struct i915_ttm_buddy_resource, base);
50 }
51 
52 int i915_ttm_buddy_man_init(struct ttm_device *bdev,
53 			    unsigned type, bool use_tt,
54 			    u64 size, u64 visible_size,
55 			    u64 default_page_size, u64 chunk_size);
56 int i915_ttm_buddy_man_fini(struct ttm_device *bdev,
57 			    unsigned int type);
58 
59 int i915_ttm_buddy_man_reserve(struct ttm_resource_manager *man,
60 			       u64 start, u64 size);
61 
62 u64 i915_ttm_buddy_man_visible_size(struct ttm_resource_manager *man);
63 
64 #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
65 void i915_ttm_buddy_man_force_visible_size(struct ttm_resource_manager *man,
66 					   u64 size);
67 #endif
68 
69 #endif
70