1 /* SPDX-License-Identifier: MIT */
2 /*
3 * Copyright © 2021 Intel Corporation
4 */
5 #ifndef __TTM_KMAP_ITER_H__
6 #define __TTM_KMAP_ITER_H__
7
8 #include <linux/types.h>
9
10 struct ttm_kmap_iter;
11 struct iosys_map;
12
13 /**
14 * struct ttm_kmap_iter_ops - Ops structure for a struct
15 * ttm_kmap_iter.
16 * @maps_tt: Whether the iterator maps TT memory directly, as opposed
17 * mapping a TT through an aperture. Both these modes have
18 * struct ttm_resource_manager::use_tt set, but the latter typically
19 * returns is_iomem == true from ttm_mem_io_reserve.
20 */
21 struct ttm_kmap_iter_ops {
22 /**
23 * @map_local: Map a PAGE_SIZE part of the resource using
24 * kmap_local semantics.
25 * @res_iter: Pointer to the struct ttm_kmap_iter representing
26 * the resource.
27 * @dmap: The struct iosys_map holding the virtual address after
28 * the operation.
29 * @i: The location within the resource to map. PAGE_SIZE granularity.
30 */
31 void (*map_local)(struct ttm_kmap_iter *res_iter,
32 struct iosys_map *dmap, pgoff_t i);
33 /**
34 * @unmap_local: Unmap a PAGE_SIZE part of the resource previously
35 * mapped using kmap_local.
36 * @res_iter: Pointer to the struct ttm_kmap_iter representing
37 * the resource.
38 * @dmap: The struct iosys_map holding the virtual address after
39 * the operation.
40 */
41 void (*unmap_local)(struct ttm_kmap_iter *res_iter,
42 struct iosys_map *dmap);
43 bool maps_tt;
44 };
45
46 /**
47 * struct ttm_kmap_iter - Iterator for kmap_local type operations on a
48 * resource.
49 * @ops: Pointer to the operations struct.
50 *
51 * This struct is intended to be embedded in a resource-specific specialization
52 * implementing operations for the resource.
53 *
54 * Nothing stops us from extending the operations to vmap, vmap_pfn etc,
55 * replacing some or parts of the ttm_bo_util. cpu-map functionality.
56 */
57 struct ttm_kmap_iter {
58 const struct ttm_kmap_iter_ops *ops;
59 };
60
61 #endif /* __TTM_KMAP_ITER_H__ */
62
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