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2 *
3 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
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14 * The above copyright notice and this permission notice (including the
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26 **************************************************************************/
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
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