Commit | Line | Data |
---|---|---|
dc21752e | 1 | /* |
fe314195 | 2 | * Copyright(c) 2016 Intel Corporation. |
dc21752e DD |
3 | * |
4 | * This file is provided under a dual BSD/GPLv2 license. When using or | |
5 | * redistributing this file, you may do so under either license. | |
6 | * | |
7 | * GPL LICENSE SUMMARY | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of version 2 of the GNU General Public License as | |
11 | * published by the Free Software Foundation. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, but | |
14 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * General Public License for more details. | |
17 | * | |
18 | * BSD LICENSE | |
19 | * | |
20 | * Redistribution and use in source and binary forms, with or without | |
21 | * modification, are permitted provided that the following conditions | |
22 | * are met: | |
23 | * | |
24 | * - Redistributions of source code must retain the above copyright | |
25 | * notice, this list of conditions and the following disclaimer. | |
26 | * - Redistributions in binary form must reproduce the above copyright | |
27 | * notice, this list of conditions and the following disclaimer in | |
28 | * the documentation and/or other materials provided with the | |
29 | * distribution. | |
30 | * - Neither the name of Intel Corporation nor the names of its | |
31 | * contributors may be used to endorse or promote products derived | |
32 | * from this software without specific prior written permission. | |
33 | * | |
34 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
35 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
36 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
37 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
38 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
39 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
40 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
41 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
42 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
43 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
44 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
45 | * | |
46 | */ | |
47 | ||
48 | #include <linux/slab.h> | |
822514d7 DD |
49 | #include <linux/vmalloc.h> |
50 | #include <linux/mm.h> | |
51 | #include <asm/pgtable.h> | |
dc21752e DD |
52 | #include "mmap.h" |
53 | ||
90793f71 DD |
54 | /** |
55 | * rvt_mmap_init - init link list and lock for mem map | |
56 | * @rdi: rvt dev struct | |
57 | */ | |
822514d7 DD |
58 | void rvt_mmap_init(struct rvt_dev_info *rdi) |
59 | { | |
60 | INIT_LIST_HEAD(&rdi->pending_mmaps); | |
61 | spin_lock_init(&rdi->pending_lock); | |
62 | rdi->mmap_offset = PAGE_SIZE; | |
63 | spin_lock_init(&rdi->mmap_offset_lock); | |
64 | } | |
65 | ||
66 | /** | |
67 | * rvt_release_mmap_info - free mmap info structure | |
68 | * @ref: a pointer to the kref within struct rvt_mmap_info | |
69 | */ | |
70 | void rvt_release_mmap_info(struct kref *ref) | |
71 | { | |
72 | struct rvt_mmap_info *ip = | |
73 | container_of(ref, struct rvt_mmap_info, ref); | |
74 | struct rvt_dev_info *rdi = ib_to_rvt(ip->context->device); | |
75 | ||
76 | spin_lock_irq(&rdi->pending_lock); | |
77 | list_del(&ip->pending_mmaps); | |
78 | spin_unlock_irq(&rdi->pending_lock); | |
79 | ||
80 | vfree(ip->obj); | |
81 | kfree(ip); | |
82 | } | |
822514d7 | 83 | |
822514d7 DD |
84 | static void rvt_vma_open(struct vm_area_struct *vma) |
85 | { | |
86 | struct rvt_mmap_info *ip = vma->vm_private_data; | |
87 | ||
88 | kref_get(&ip->ref); | |
89 | } | |
90 | ||
91 | static void rvt_vma_close(struct vm_area_struct *vma) | |
92 | { | |
93 | struct rvt_mmap_info *ip = vma->vm_private_data; | |
94 | ||
95 | kref_put(&ip->ref, rvt_release_mmap_info); | |
96 | } | |
97 | ||
98 | static const struct vm_operations_struct rvt_vm_ops = { | |
99 | .open = rvt_vma_open, | |
100 | .close = rvt_vma_close, | |
101 | }; | |
102 | ||
dc21752e DD |
103 | /** |
104 | * rvt_mmap - create a new mmap region | |
105 | * @context: the IB user context of the process making the mmap() call | |
106 | * @vma: the VMA to be initialized | |
90793f71 DD |
107 | * |
108 | * Return: zero if the mmap is OK. Otherwise, return an errno. | |
dc21752e DD |
109 | */ |
110 | int rvt_mmap(struct ib_ucontext *context, struct vm_area_struct *vma) | |
111 | { | |
822514d7 DD |
112 | struct rvt_dev_info *rdi = ib_to_rvt(context->device); |
113 | unsigned long offset = vma->vm_pgoff << PAGE_SHIFT; | |
114 | unsigned long size = vma->vm_end - vma->vm_start; | |
115 | struct rvt_mmap_info *ip, *pp; | |
116 | int ret = -EINVAL; | |
117 | ||
118 | /* | |
119 | * Search the device's list of objects waiting for a mmap call. | |
120 | * Normally, this list is very short since a call to create a | |
121 | * CQ, QP, or SRQ is soon followed by a call to mmap(). | |
122 | */ | |
123 | spin_lock_irq(&rdi->pending_lock); | |
124 | list_for_each_entry_safe(ip, pp, &rdi->pending_mmaps, | |
125 | pending_mmaps) { | |
126 | /* Only the creator is allowed to mmap the object */ | |
127 | if (context != ip->context || (__u64)offset != ip->offset) | |
128 | continue; | |
129 | /* Don't allow a mmap larger than the object. */ | |
130 | if (size > ip->size) | |
131 | break; | |
132 | ||
133 | list_del_init(&ip->pending_mmaps); | |
134 | spin_unlock_irq(&rdi->pending_lock); | |
135 | ||
136 | ret = remap_vmalloc_range(vma, ip->obj, 0); | |
137 | if (ret) | |
138 | goto done; | |
139 | vma->vm_ops = &rvt_vm_ops; | |
140 | vma->vm_private_data = ip; | |
141 | rvt_vma_open(vma); | |
142 | goto done; | |
143 | } | |
144 | spin_unlock_irq(&rdi->pending_lock); | |
145 | done: | |
146 | return ret; | |
147 | } | |
822514d7 | 148 | |
90793f71 DD |
149 | /** |
150 | * rvt_create_mmap_info - allocate information for hfi1_mmap | |
151 | * @rdi: rvt dev struct | |
152 | * @size: size in bytes to map | |
153 | * @context: user context | |
154 | * @obj: opaque pointer to a cq, wq etc | |
155 | * | |
156 | * Return: rvt_mmap struct on success | |
822514d7 DD |
157 | */ |
158 | struct rvt_mmap_info *rvt_create_mmap_info(struct rvt_dev_info *rdi, | |
159 | u32 size, | |
160 | struct ib_ucontext *context, | |
161 | void *obj) | |
162 | { | |
163 | struct rvt_mmap_info *ip; | |
164 | ||
d1b697b6 | 165 | ip = kmalloc_node(sizeof(*ip), GFP_KERNEL, rdi->dparms.node); |
822514d7 DD |
166 | if (!ip) |
167 | return ip; | |
168 | ||
169 | size = PAGE_ALIGN(size); | |
170 | ||
171 | spin_lock_irq(&rdi->mmap_offset_lock); | |
172 | if (rdi->mmap_offset == 0) | |
173 | rdi->mmap_offset = PAGE_SIZE; | |
174 | ip->offset = rdi->mmap_offset; | |
175 | rdi->mmap_offset += size; | |
176 | spin_unlock_irq(&rdi->mmap_offset_lock); | |
177 | ||
178 | INIT_LIST_HEAD(&ip->pending_mmaps); | |
179 | ip->size = size; | |
180 | ip->context = context; | |
181 | ip->obj = obj; | |
182 | kref_init(&ip->ref); | |
183 | ||
184 | return ip; | |
185 | } | |
822514d7 | 186 | |
90793f71 DD |
187 | /** |
188 | * rvt_update_mmap_info - update a mem map | |
189 | * @rdi: rvt dev struct | |
190 | * @ip: mmap info pointer | |
191 | * @size: size to grow by | |
192 | * @obj: opaque pointer to cq, wq, etc. | |
193 | */ | |
822514d7 DD |
194 | void rvt_update_mmap_info(struct rvt_dev_info *rdi, struct rvt_mmap_info *ip, |
195 | u32 size, void *obj) | |
196 | { | |
197 | size = PAGE_ALIGN(size); | |
198 | ||
199 | spin_lock_irq(&rdi->mmap_offset_lock); | |
200 | if (rdi->mmap_offset == 0) | |
201 | rdi->mmap_offset = PAGE_SIZE; | |
202 | ip->offset = rdi->mmap_offset; | |
203 | rdi->mmap_offset += size; | |
204 | spin_unlock_irq(&rdi->mmap_offset_lock); | |
205 | ||
206 | ip->size = size; | |
207 | ip->obj = obj; | |
dc21752e | 208 | } |