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28 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
31 #ifndef _TTM_PLACEMENT_H_
32 #define _TTM_PLACEMENT_H_
34 #include <linux/types.h>
37 * Memory regions for data placement.
40 #define TTM_PL_SYSTEM 0
46 * Other flags that affects data placement.
47 * TTM_PL_FLAG_CACHED indicates cache-coherent mappings
49 * TTM_PL_FLAG_SHARED means that another application may
50 * reference the buffer.
51 * TTM_PL_FLAG_NO_EVICT means that the buffer may never
52 * be evicted to make room for other buffers.
53 * TTM_PL_FLAG_TOPDOWN requests to be placed from the
54 * top of the memory area, instead of the bottom.
57 #define TTM_PL_FLAG_CACHED (1 << 16)
58 #define TTM_PL_FLAG_UNCACHED (1 << 17)
59 #define TTM_PL_FLAG_WC (1 << 18)
60 #define TTM_PL_FLAG_CONTIGUOUS (1 << 19)
61 #define TTM_PL_FLAG_NO_EVICT (1 << 21)
62 #define TTM_PL_FLAG_TOPDOWN (1 << 22)
64 #define TTM_PL_MASK_CACHING (TTM_PL_FLAG_CACHED | \
65 TTM_PL_FLAG_UNCACHED | \
71 * @fpfn: first valid page frame number to put the object
72 * @lpfn: last valid page frame number to put the object
73 * @flags: memory domain and caching flags for the object
75 * Structure indicating a possible place to put an object.
85 * struct ttm_placement
87 * @num_placement: number of preferred placements
88 * @placement: preferred placements
89 * @num_busy_placement: number of preferred placements when need to evict buffer
90 * @busy_placement: preferred placements when need to evict buffer
92 * Structure indicating the placement you request for an object.
94 struct ttm_placement {
95 unsigned num_placement;
96 const struct ttm_place *placement;
97 unsigned num_busy_placement;
98 const struct ttm_place *busy_placement;