xref: /linux/include/drm/ttm/ttm_placement.h (revision b7e1e969c887c897947fdc3754fe9b0c24acb155)
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27 /*
28  * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
29  */
30 
31 #ifndef _TTM_PLACEMENT_H_
32 #define _TTM_PLACEMENT_H_
33 
34 #include <linux/types.h>
35 
36 /*
37  * Memory regions for data placement.
38  *
39  * Buffers placed in TTM_PL_SYSTEM are considered under TTMs control and can
40  * be swapped out whenever TTMs thinks it is a good idea.
41  * In cases where drivers would like to use TTM_PL_SYSTEM as a valid
42  * placement they need to be able to handle the issues that arise due to the
43  * above manually.
44  *
45  * For BO's which reside in system memory but for which the accelerator
46  * requires direct access (i.e. their usage needs to be synchronized
47  * between the CPU and accelerator via fences) a new, driver private
48  * placement that can handle such scenarios is a good idea.
49  */
50 
51 #define TTM_PL_SYSTEM           0
52 #define TTM_PL_TT               1
53 #define TTM_PL_VRAM             2
54 #define TTM_PL_PRIV             3
55 
56 /*
57  * TTM_PL_FLAG_TOPDOWN requests to be placed from the
58  * top of the memory area, instead of the bottom.
59  */
60 
61 #define TTM_PL_FLAG_CONTIGUOUS  (1 << 0)
62 #define TTM_PL_FLAG_TOPDOWN     (1 << 1)
63 
64 /* For multihop handling */
65 #define TTM_PL_FLAG_TEMPORARY   (1 << 2)
66 
67 /* Placement is never used during eviction */
68 #define TTM_PL_FLAG_DESIRED	(1 << 3)
69 
70 /* Placement is only used during eviction */
71 #define TTM_PL_FLAG_FALLBACK	(1 << 4)
72 
73 /**
74  * struct ttm_place
75  *
76  * @fpfn:	first valid page frame number to put the object
77  * @lpfn:	last valid page frame number to put the object
78  * @mem_type:	One of TTM_PL_* where the resource should be allocated from.
79  * @flags:	memory domain and caching flags for the object
80  *
81  * Structure indicating a possible place to put an object.
82  */
83 struct ttm_place {
84 	unsigned	fpfn;
85 	unsigned	lpfn;
86 	uint32_t	mem_type;
87 	uint32_t	flags;
88 };
89 
90 /**
91  * struct ttm_placement
92  *
93  * @num_placement:	number of preferred placements
94  * @placement:		preferred placements
95  *
96  * Structure indicating the placement you request for an object.
97  */
98 struct ttm_placement {
99 	unsigned		num_placement;
100 	const struct ttm_place	*placement;
101 };
102 
103 #endif
104