x86/mm/pat: Don't report PAT on CPUs that don't support it
[linux/fpc-iii.git] / include / rdma / ib_umem_odp.h
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1 /*
2 * Copyright (c) 2014 Mellanox Technologies. All rights reserved.
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:
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
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.
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.
33 #ifndef IB_UMEM_ODP_H
34 #define IB_UMEM_ODP_H
36 #include <rdma/ib_umem.h>
37 #include <rdma/ib_verbs.h>
38 #include <linux/interval_tree.h>
40 struct umem_odp_node {
41 u64 __subtree_last;
42 struct rb_node rb;
45 struct ib_umem_odp {
47 * An array of the pages included in the on-demand paging umem.
48 * Indices of pages that are currently not mapped into the device will
49 * contain NULL.
51 struct page **page_list;
53 * An array of the same size as page_list, with DMA addresses mapped
54 * for pages the pages in page_list. The lower two bits designate
55 * access permissions. See ODP_READ_ALLOWED_BIT and
56 * ODP_WRITE_ALLOWED_BIT.
58 dma_addr_t *dma_list;
60 * The umem_mutex protects the page_list and dma_list fields of an ODP
61 * umem, allowing only a single thread to map/unmap pages. The mutex
62 * also protects access to the mmu notifier counters.
64 struct mutex umem_mutex;
65 void *private; /* for the HW driver to use. */
67 /* When false, use the notifier counter in the ucontext struct. */
68 bool mn_counters_active;
69 int notifiers_seq;
70 int notifiers_count;
72 /* A linked list of umems that don't have private mmu notifier
73 * counters yet. */
74 struct list_head no_private_counters;
75 struct ib_umem *umem;
77 /* Tree tracking */
78 struct umem_odp_node interval_tree;
80 struct completion notifier_completion;
81 int dying;
82 struct work_struct work;
85 #ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING
87 int ib_umem_odp_get(struct ib_ucontext *context, struct ib_umem *umem);
88 struct ib_umem *ib_alloc_odp_umem(struct ib_ucontext *context,
89 unsigned long addr,
90 size_t size);
92 void ib_umem_odp_release(struct ib_umem *umem);
95 * The lower 2 bits of the DMA address signal the R/W permissions for
96 * the entry. To upgrade the permissions, provide the appropriate
97 * bitmask to the map_dma_pages function.
99 * Be aware that upgrading a mapped address might result in change of
100 * the DMA address for the page.
102 #define ODP_READ_ALLOWED_BIT (1<<0ULL)
103 #define ODP_WRITE_ALLOWED_BIT (1<<1ULL)
105 #define ODP_DMA_ADDR_MASK (~(ODP_READ_ALLOWED_BIT | ODP_WRITE_ALLOWED_BIT))
107 int ib_umem_odp_map_dma_pages(struct ib_umem *umem, u64 start_offset, u64 bcnt,
108 u64 access_mask, unsigned long current_seq);
110 void ib_umem_odp_unmap_dma_pages(struct ib_umem *umem, u64 start_offset,
111 u64 bound);
113 void rbt_ib_umem_insert(struct umem_odp_node *node, struct rb_root *root);
114 void rbt_ib_umem_remove(struct umem_odp_node *node, struct rb_root *root);
115 typedef int (*umem_call_back)(struct ib_umem *item, u64 start, u64 end,
116 void *cookie);
118 * Call the callback on each ib_umem in the range. Returns the logical or of
119 * the return values of the functions called.
121 int rbt_ib_umem_for_each_in_range(struct rb_root *root, u64 start, u64 end,
122 umem_call_back cb, void *cookie);
125 * Find first region intersecting with address range.
126 * Return NULL if not found
128 struct ib_umem_odp *rbt_ib_umem_lookup(struct rb_root *root,
129 u64 addr, u64 length);
131 static inline int ib_umem_mmu_notifier_retry(struct ib_umem *item,
132 unsigned long mmu_seq)
135 * This code is strongly based on the KVM code from
136 * mmu_notifier_retry. Should be called with
137 * the relevant locks taken (item->odp_data->umem_mutex
138 * and the ucontext umem_mutex semaphore locked for read).
141 /* Do not allow page faults while the new ib_umem hasn't seen a state
142 * with zero notifiers yet, and doesn't have its own valid set of
143 * private counters. */
144 if (!item->odp_data->mn_counters_active)
145 return 1;
147 if (unlikely(item->odp_data->notifiers_count))
148 return 1;
149 if (item->odp_data->notifiers_seq != mmu_seq)
150 return 1;
151 return 0;
154 #else /* CONFIG_INFINIBAND_ON_DEMAND_PAGING */
156 static inline int ib_umem_odp_get(struct ib_ucontext *context,
157 struct ib_umem *umem)
159 return -EINVAL;
162 static inline struct ib_umem *ib_alloc_odp_umem(struct ib_ucontext *context,
163 unsigned long addr,
164 size_t size)
166 return ERR_PTR(-EINVAL);
169 static inline void ib_umem_odp_release(struct ib_umem *umem) {}
171 #endif /* CONFIG_INFINIBAND_ON_DEMAND_PAGING */
173 #endif /* IB_UMEM_ODP_H */