]>
Commit | Line | Data |
---|---|---|
1 | /* | |
2 | * Copyright (c) 2014 Mellanox Technologies. All rights reserved. | |
3 | * | |
4 | * This software is available to you under a choice of one of two | |
5 | * licenses. You may choose to be licensed under the terms of the GNU | |
6 | * General Public License (GPL) Version 2, available from the file | |
7 | * COPYING in the main directory of this source tree, or the | |
8 | * OpenIB.org BSD license below: | |
9 | * | |
10 | * Redistribution and use in source and binary forms, with or | |
11 | * without modification, are permitted provided that the following | |
12 | * conditions are met: | |
13 | * | |
14 | * - Redistributions of source code must retain the above | |
15 | * copyright notice, this list of conditions and the following | |
16 | * disclaimer. | |
17 | * | |
18 | * - Redistributions in binary form must reproduce the above | |
19 | * copyright notice, this list of conditions and the following | |
20 | * disclaimer in the documentation and/or other materials | |
21 | * provided with the distribution. | |
22 | * | |
23 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
24 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
25 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
26 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
27 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
28 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
29 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
30 | * SOFTWARE. | |
31 | */ | |
32 | ||
33 | #ifndef IB_UMEM_ODP_H | |
34 | #define IB_UMEM_ODP_H | |
35 | ||
36 | #include <rdma/ib_umem.h> | |
37 | #include <rdma/ib_verbs.h> | |
38 | #include <linux/interval_tree.h> | |
39 | ||
40 | struct umem_odp_node { | |
41 | u64 __subtree_last; | |
42 | struct rb_node rb; | |
43 | }; | |
44 | ||
45 | struct ib_umem_odp { | |
46 | struct ib_umem umem; | |
47 | struct ib_ucontext_per_mm *per_mm; | |
48 | ||
49 | /* | |
50 | * An array of the pages included in the on-demand paging umem. | |
51 | * Indices of pages that are currently not mapped into the device will | |
52 | * contain NULL. | |
53 | */ | |
54 | struct page **page_list; | |
55 | /* | |
56 | * An array of the same size as page_list, with DMA addresses mapped | |
57 | * for pages the pages in page_list. The lower two bits designate | |
58 | * access permissions. See ODP_READ_ALLOWED_BIT and | |
59 | * ODP_WRITE_ALLOWED_BIT. | |
60 | */ | |
61 | dma_addr_t *dma_list; | |
62 | /* | |
63 | * The umem_mutex protects the page_list and dma_list fields of an ODP | |
64 | * umem, allowing only a single thread to map/unmap pages. The mutex | |
65 | * also protects access to the mmu notifier counters. | |
66 | */ | |
67 | struct mutex umem_mutex; | |
68 | void *private; /* for the HW driver to use. */ | |
69 | ||
70 | int notifiers_seq; | |
71 | int notifiers_count; | |
72 | ||
73 | /* Tree tracking */ | |
74 | struct umem_odp_node interval_tree; | |
75 | ||
76 | struct completion notifier_completion; | |
77 | int dying; | |
78 | struct work_struct work; | |
79 | }; | |
80 | ||
81 | static inline struct ib_umem_odp *to_ib_umem_odp(struct ib_umem *umem) | |
82 | { | |
83 | return container_of(umem, struct ib_umem_odp, umem); | |
84 | } | |
85 | ||
86 | #ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING | |
87 | ||
88 | struct ib_ucontext_per_mm { | |
89 | struct ib_ucontext *context; | |
90 | struct mm_struct *mm; | |
91 | struct pid *tgid; | |
92 | bool active; | |
93 | ||
94 | struct rb_root_cached umem_tree; | |
95 | /* Protects umem_tree */ | |
96 | struct rw_semaphore umem_rwsem; | |
97 | ||
98 | struct mmu_notifier mn; | |
99 | unsigned int odp_mrs_count; | |
100 | ||
101 | struct list_head ucontext_list; | |
102 | struct rcu_head rcu; | |
103 | }; | |
104 | ||
105 | int ib_umem_odp_get(struct ib_umem_odp *umem_odp, int access); | |
106 | struct ib_umem_odp *ib_alloc_odp_umem(struct ib_ucontext_per_mm *per_mm, | |
107 | unsigned long addr, size_t size); | |
108 | void ib_umem_odp_release(struct ib_umem_odp *umem_odp); | |
109 | ||
110 | /* | |
111 | * The lower 2 bits of the DMA address signal the R/W permissions for | |
112 | * the entry. To upgrade the permissions, provide the appropriate | |
113 | * bitmask to the map_dma_pages function. | |
114 | * | |
115 | * Be aware that upgrading a mapped address might result in change of | |
116 | * the DMA address for the page. | |
117 | */ | |
118 | #define ODP_READ_ALLOWED_BIT (1<<0ULL) | |
119 | #define ODP_WRITE_ALLOWED_BIT (1<<1ULL) | |
120 | ||
121 | #define ODP_DMA_ADDR_MASK (~(ODP_READ_ALLOWED_BIT | ODP_WRITE_ALLOWED_BIT)) | |
122 | ||
123 | int ib_umem_odp_map_dma_pages(struct ib_umem_odp *umem_odp, u64 start_offset, | |
124 | u64 bcnt, u64 access_mask, | |
125 | unsigned long current_seq); | |
126 | ||
127 | void ib_umem_odp_unmap_dma_pages(struct ib_umem_odp *umem_odp, u64 start_offset, | |
128 | u64 bound); | |
129 | ||
130 | typedef int (*umem_call_back)(struct ib_umem_odp *item, u64 start, u64 end, | |
131 | void *cookie); | |
132 | /* | |
133 | * Call the callback on each ib_umem in the range. Returns the logical or of | |
134 | * the return values of the functions called. | |
135 | */ | |
136 | int rbt_ib_umem_for_each_in_range(struct rb_root_cached *root, | |
137 | u64 start, u64 end, | |
138 | umem_call_back cb, | |
139 | bool blockable, void *cookie); | |
140 | ||
141 | /* | |
142 | * Find first region intersecting with address range. | |
143 | * Return NULL if not found | |
144 | */ | |
145 | struct ib_umem_odp *rbt_ib_umem_lookup(struct rb_root_cached *root, | |
146 | u64 addr, u64 length); | |
147 | ||
148 | static inline int ib_umem_mmu_notifier_retry(struct ib_umem_odp *umem_odp, | |
149 | unsigned long mmu_seq) | |
150 | { | |
151 | /* | |
152 | * This code is strongly based on the KVM code from | |
153 | * mmu_notifier_retry. Should be called with | |
154 | * the relevant locks taken (umem_odp->umem_mutex | |
155 | * and the ucontext umem_mutex semaphore locked for read). | |
156 | */ | |
157 | ||
158 | if (unlikely(umem_odp->notifiers_count)) | |
159 | return 1; | |
160 | if (umem_odp->notifiers_seq != mmu_seq) | |
161 | return 1; | |
162 | return 0; | |
163 | } | |
164 | ||
165 | #else /* CONFIG_INFINIBAND_ON_DEMAND_PAGING */ | |
166 | ||
167 | static inline int ib_umem_odp_get(struct ib_umem_odp *umem_odp, int access) | |
168 | { | |
169 | return -EINVAL; | |
170 | } | |
171 | ||
172 | static inline struct ib_umem_odp * | |
173 | ib_alloc_odp_umem(struct ib_ucontext *context, unsigned long addr, size_t size) | |
174 | { | |
175 | return ERR_PTR(-EINVAL); | |
176 | } | |
177 | ||
178 | static inline void ib_umem_odp_release(struct ib_umem_odp *umem_odp) {} | |
179 | ||
180 | #endif /* CONFIG_INFINIBAND_ON_DEMAND_PAGING */ | |
181 | ||
182 | #endif /* IB_UMEM_ODP_H */ |