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1/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
2/*
3 * Copyright (c) 2014 Mellanox Technologies. All rights reserved.
4 */
5
6#ifndef IB_UMEM_ODP_H
7#define IB_UMEM_ODP_H
8
9#include <rdma/ib_umem.h>
10#include <rdma/ib_verbs.h>
11#include <linux/hmm-dma.h>
12
13struct ib_umem_odp {
14 struct ib_umem umem;
15 struct mmu_interval_notifier notifier;
16 struct pid *tgid;
17
18 struct hmm_dma_map map;
19
20 /*
21 * The umem_mutex protects the page_list field of an ODP
22 * umem, allowing only a single thread to map/unmap pages. The mutex
23 * also protects access to the mmu notifier counters.
24 */
25 struct mutex umem_mutex;
26 void *private; /* for the HW driver to use. */
27
28 int npages;
29
30 /*
31 * An implicit odp umem cannot be DMA mapped, has 0 length, and serves
32 * only as an anchor for the driver to hold onto the per_mm. FIXME:
33 * This should be removed and drivers should work with the per_mm
34 * directly.
35 */
36 bool is_implicit_odp;
37
38 unsigned int page_shift;
39};
40
41static inline struct ib_umem_odp *to_ib_umem_odp(struct ib_umem *umem)
42{
43 return container_of(umem, struct ib_umem_odp, umem);
44}
45
46/* Returns the first page of an ODP umem. */
47static inline unsigned long ib_umem_start(struct ib_umem_odp *umem_odp)
48{
49 return umem_odp->notifier.interval_tree.start;
50}
51
52/* Returns the address of the page after the last one of an ODP umem. */
53static inline unsigned long ib_umem_end(struct ib_umem_odp *umem_odp)
54{
55 return umem_odp->notifier.interval_tree.last + 1;
56}
57
58static inline size_t ib_umem_odp_num_pages(struct ib_umem_odp *umem_odp)
59{
60 return (ib_umem_end(umem_odp) - ib_umem_start(umem_odp)) >>
61 umem_odp->page_shift;
62}
63
64#ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING
65
66struct ib_umem_odp *
67ib_umem_odp_get(struct ib_device *device, unsigned long addr, size_t size,
68 int access, const struct mmu_interval_notifier_ops *ops);
69struct ib_umem_odp *ib_umem_odp_alloc_implicit(struct ib_device *device,
70 int access);
71struct ib_umem_odp *
72ib_umem_odp_alloc_child(struct ib_umem_odp *root_umem, unsigned long addr,
73 size_t size,
74 const struct mmu_interval_notifier_ops *ops);
75void ib_umem_odp_release(struct ib_umem_odp *umem_odp);
76
77int ib_umem_odp_map_dma_and_lock(struct ib_umem_odp *umem_odp, u64 start_offset,
78 u64 bcnt, u64 access_mask, bool fault);
79
80void ib_umem_odp_unmap_dma_pages(struct ib_umem_odp *umem_odp, u64 start_offset,
81 u64 bound);
82
83#else /* CONFIG_INFINIBAND_ON_DEMAND_PAGING */
84
85static inline struct ib_umem_odp *
86ib_umem_odp_get(struct ib_device *device, unsigned long addr, size_t size,
87 int access, const struct mmu_interval_notifier_ops *ops)
88{
89 return ERR_PTR(-EINVAL);
90}
91
92static inline void ib_umem_odp_release(struct ib_umem_odp *umem_odp) {}
93
94#endif /* CONFIG_INFINIBAND_ON_DEMAND_PAGING */
95
96#endif /* IB_UMEM_ODP_H */