1 /* SPDX-License-Identifier: GPL-2.0 OR Linux-O 1 /* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
2 /* 2 /*
3 * Copyright (c) 2014 Mellanox Technologies. A 3 * Copyright (c) 2014 Mellanox Technologies. All rights reserved.
4 */ 4 */
5 5
6 #ifndef IB_UMEM_ODP_H 6 #ifndef IB_UMEM_ODP_H
7 #define IB_UMEM_ODP_H 7 #define IB_UMEM_ODP_H
8 8
9 #include <rdma/ib_umem.h> 9 #include <rdma/ib_umem.h>
10 #include <rdma/ib_verbs.h> 10 #include <rdma/ib_verbs.h>
11 11
12 struct ib_umem_odp { 12 struct ib_umem_odp {
13 struct ib_umem umem; 13 struct ib_umem umem;
14 struct mmu_interval_notifier notifier; 14 struct mmu_interval_notifier notifier;
15 struct pid *tgid; 15 struct pid *tgid;
16 16
17 /* An array of the pfns included in th 17 /* An array of the pfns included in the on-demand paging umem. */
18 unsigned long *pfn_list; 18 unsigned long *pfn_list;
19 19
20 /* 20 /*
21 * An array with DMA addresses mapped 21 * An array with DMA addresses mapped for pfns in pfn_list.
22 * The lower two bits designate access 22 * The lower two bits designate access permissions.
23 * See ODP_READ_ALLOWED_BIT and ODP_WR 23 * See ODP_READ_ALLOWED_BIT and ODP_WRITE_ALLOWED_BIT.
24 */ 24 */
25 dma_addr_t *dma_list; 25 dma_addr_t *dma_list;
26 /* 26 /*
27 * The umem_mutex protects the page_li 27 * The umem_mutex protects the page_list and dma_list fields of an ODP
28 * umem, allowing only a single thread 28 * umem, allowing only a single thread to map/unmap pages. The mutex
29 * also protects access to the mmu not 29 * also protects access to the mmu notifier counters.
30 */ 30 */
31 struct mutex umem_mutex; 31 struct mutex umem_mutex;
32 void *private; /* f 32 void *private; /* for the HW driver to use. */
33 33
34 int npages; 34 int npages;
35 35
36 /* 36 /*
37 * An implicit odp umem cannot be DMA 37 * An implicit odp umem cannot be DMA mapped, has 0 length, and serves
38 * only as an anchor for the driver to 38 * only as an anchor for the driver to hold onto the per_mm. FIXME:
39 * This should be removed and drivers 39 * This should be removed and drivers should work with the per_mm
40 * directly. 40 * directly.
41 */ 41 */
42 bool is_implicit_odp; 42 bool is_implicit_odp;
43 43
44 unsigned int page_shift; 44 unsigned int page_shift;
45 }; 45 };
46 46
47 static inline struct ib_umem_odp *to_ib_umem_o 47 static inline struct ib_umem_odp *to_ib_umem_odp(struct ib_umem *umem)
48 { 48 {
49 return container_of(umem, struct ib_um 49 return container_of(umem, struct ib_umem_odp, umem);
50 } 50 }
51 51
52 /* Returns the first page of an ODP umem. */ 52 /* Returns the first page of an ODP umem. */
53 static inline unsigned long ib_umem_start(stru 53 static inline unsigned long ib_umem_start(struct ib_umem_odp *umem_odp)
54 { 54 {
55 return umem_odp->notifier.interval_tre 55 return umem_odp->notifier.interval_tree.start;
56 } 56 }
57 57
58 /* Returns the address of the page after the l 58 /* Returns the address of the page after the last one of an ODP umem. */
59 static inline unsigned long ib_umem_end(struct 59 static inline unsigned long ib_umem_end(struct ib_umem_odp *umem_odp)
60 { 60 {
61 return umem_odp->notifier.interval_tre 61 return umem_odp->notifier.interval_tree.last + 1;
62 } 62 }
63 63
64 static inline size_t ib_umem_odp_num_pages(str 64 static inline size_t ib_umem_odp_num_pages(struct ib_umem_odp *umem_odp)
65 { 65 {
66 return (ib_umem_end(umem_odp) - ib_ume 66 return (ib_umem_end(umem_odp) - ib_umem_start(umem_odp)) >>
67 umem_odp->page_shift; 67 umem_odp->page_shift;
68 } 68 }
69 69
70 /* 70 /*
71 * The lower 2 bits of the DMA address signal 71 * The lower 2 bits of the DMA address signal the R/W permissions for
72 * the entry. To upgrade the permissions, prov 72 * the entry. To upgrade the permissions, provide the appropriate
73 * bitmask to the map_dma_pages function. 73 * bitmask to the map_dma_pages function.
74 * 74 *
75 * Be aware that upgrading a mapped address mi 75 * Be aware that upgrading a mapped address might result in change of
76 * the DMA address for the page. 76 * the DMA address for the page.
77 */ 77 */
78 #define ODP_READ_ALLOWED_BIT (1<<0ULL) 78 #define ODP_READ_ALLOWED_BIT (1<<0ULL)
79 #define ODP_WRITE_ALLOWED_BIT (1<<1ULL) 79 #define ODP_WRITE_ALLOWED_BIT (1<<1ULL)
80 80
81 #define ODP_DMA_ADDR_MASK (~(ODP_READ_ALLOWED_ 81 #define ODP_DMA_ADDR_MASK (~(ODP_READ_ALLOWED_BIT | ODP_WRITE_ALLOWED_BIT))
82 82
83 #ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING 83 #ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING
84 84
85 struct ib_umem_odp * 85 struct ib_umem_odp *
86 ib_umem_odp_get(struct ib_device *device, unsi 86 ib_umem_odp_get(struct ib_device *device, unsigned long addr, size_t size,
87 int access, const struct mmu_i 87 int access, const struct mmu_interval_notifier_ops *ops);
88 struct ib_umem_odp *ib_umem_odp_alloc_implicit 88 struct ib_umem_odp *ib_umem_odp_alloc_implicit(struct ib_device *device,
89 89 int access);
90 struct ib_umem_odp * 90 struct ib_umem_odp *
91 ib_umem_odp_alloc_child(struct ib_umem_odp *ro 91 ib_umem_odp_alloc_child(struct ib_umem_odp *root_umem, unsigned long addr,
92 size_t size, 92 size_t size,
93 const struct mmu_inter 93 const struct mmu_interval_notifier_ops *ops);
94 void ib_umem_odp_release(struct ib_umem_odp *u 94 void ib_umem_odp_release(struct ib_umem_odp *umem_odp);
95 95
96 int ib_umem_odp_map_dma_and_lock(struct ib_ume 96 int ib_umem_odp_map_dma_and_lock(struct ib_umem_odp *umem_odp, u64 start_offset,
97 u64 bcnt, u64 97 u64 bcnt, u64 access_mask, bool fault);
98 98
99 void ib_umem_odp_unmap_dma_pages(struct ib_ume 99 void ib_umem_odp_unmap_dma_pages(struct ib_umem_odp *umem_odp, u64 start_offset,
100 u64 bound); 100 u64 bound);
101 101
102 #else /* CONFIG_INFINIBAND_ON_DEMAND_PAGING */ 102 #else /* CONFIG_INFINIBAND_ON_DEMAND_PAGING */
103 103
104 static inline struct ib_umem_odp * 104 static inline struct ib_umem_odp *
105 ib_umem_odp_get(struct ib_device *device, unsi 105 ib_umem_odp_get(struct ib_device *device, unsigned long addr, size_t size,
106 int access, const struct mmu_i 106 int access, const struct mmu_interval_notifier_ops *ops)
107 { 107 {
108 return ERR_PTR(-EINVAL); 108 return ERR_PTR(-EINVAL);
109 } 109 }
110 110
111 static inline void ib_umem_odp_release(struct 111 static inline void ib_umem_odp_release(struct ib_umem_odp *umem_odp) {}
112 112
113 #endif /* CONFIG_INFINIBAND_ON_DEMAND_PAGING * 113 #endif /* CONFIG_INFINIBAND_ON_DEMAND_PAGING */
114 114
115 #endif /* IB_UMEM_ODP_H */ 115 #endif /* IB_UMEM_ODP_H */
116 116
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