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2  *
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11  * permit persons to whom the Software is furnished to do so, subject to
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15  * next paragraph) shall be included in all copies or substantial portions
16  * of the Software.
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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 
40 #define TTM_PL_SYSTEM           0
41 #define TTM_PL_TT               1
42 #define TTM_PL_VRAM             2
43 #define TTM_PL_PRIV             3
44 
45 #define TTM_PL_FLAG_SYSTEM      (1 << TTM_PL_SYSTEM)
46 #define TTM_PL_FLAG_TT          (1 << TTM_PL_TT)
47 #define TTM_PL_FLAG_VRAM        (1 << TTM_PL_VRAM)
48 #define TTM_PL_FLAG_PRIV        (1 << TTM_PL_PRIV)
49 #define TTM_PL_MASK_MEM         0x0000FFFF
50 
51 /*
52  * Other flags that affects data placement.
53  * TTM_PL_FLAG_CACHED indicates cache-coherent mappings
54  * if available.
55  * TTM_PL_FLAG_SHARED means that another application may
56  * reference the buffer.
57  * TTM_PL_FLAG_NO_EVICT means that the buffer may never
58  * be evicted to make room for other buffers.
59  * TTM_PL_FLAG_TOPDOWN requests to be placed from the
60  * top of the memory area, instead of the bottom.
61  */
62 
63 #define TTM_PL_FLAG_CACHED      (1 << 16)
64 #define TTM_PL_FLAG_UNCACHED    (1 << 17)
65 #define TTM_PL_FLAG_WC          (1 << 18)
66 #define TTM_PL_FLAG_CONTIGUOUS  (1 << 19)
67 #define TTM_PL_FLAG_NO_EVICT    (1 << 21)
68 #define TTM_PL_FLAG_TOPDOWN     (1 << 22)
69 
70 #define TTM_PL_MASK_CACHING     (TTM_PL_FLAG_CACHED | \
71 				 TTM_PL_FLAG_UNCACHED | \
72 				 TTM_PL_FLAG_WC)
73 
74 #define TTM_PL_MASK_MEMTYPE     (TTM_PL_MASK_MEM | TTM_PL_MASK_CACHING)
75 
76 /**
77  * struct ttm_place
78  *
79  * @fpfn:	first valid page frame number to put the object
80  * @lpfn:	last valid page frame number to put the object
81  * @flags:	memory domain and caching flags for the object
82  *
83  * Structure indicating a possible place to put an object.
84  */
85 struct ttm_place {
86 	unsigned	fpfn;
87 	unsigned	lpfn;
88 	uint32_t	flags;
89 };
90 
91 /**
92  * struct ttm_placement
93  *
94  * @num_placement:	number of preferred placements
95  * @placement:		preferred placements
96  * @num_busy_placement:	number of preferred placements when need to evict buffer
97  * @busy_placement:	preferred placements when need to evict buffer
98  *
99  * Structure indicating the placement you request for an object.
100  */
101 struct ttm_placement {
102 	unsigned		num_placement;
103 	const struct ttm_place	*placement;
104 	unsigned		num_busy_placement;
105 	const struct ttm_place	*busy_placement;
106 };
107 
108 #endif
109