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373d9915 | 1 | /* |
87427da5 | 2 | * Copyright (c) 2006, 2007 QLogic Corporation. All rights reserved. |
373d9915 RC |
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 | ||
373d9915 RC |
33 | #include <linux/module.h> |
34 | #include <linux/vmalloc.h> | |
35 | #include <linux/mm.h> | |
36 | #include <linux/errno.h> | |
37 | #include <asm/pgtable.h> | |
38 | ||
39 | #include "ipath_verbs.h" | |
40 | ||
41 | /** | |
42 | * ipath_release_mmap_info - free mmap info structure | |
43 | * @ref: a pointer to the kref within struct ipath_mmap_info | |
44 | */ | |
45 | void ipath_release_mmap_info(struct kref *ref) | |
46 | { | |
47 | struct ipath_mmap_info *ip = | |
48 | container_of(ref, struct ipath_mmap_info, ref); | |
6b66b2da RW |
49 | struct ipath_ibdev *dev = to_idev(ip->context->device); |
50 | ||
51 | spin_lock_irq(&dev->pending_lock); | |
52 | list_del(&ip->pending_mmaps); | |
53 | spin_unlock_irq(&dev->pending_lock); | |
373d9915 RC |
54 | |
55 | vfree(ip->obj); | |
56 | kfree(ip); | |
57 | } | |
58 | ||
59 | /* | |
60 | * open and close keep track of how many times the CQ is mapped, | |
61 | * to avoid releasing it. | |
62 | */ | |
63 | static void ipath_vma_open(struct vm_area_struct *vma) | |
64 | { | |
65 | struct ipath_mmap_info *ip = vma->vm_private_data; | |
66 | ||
67 | kref_get(&ip->ref); | |
373d9915 RC |
68 | } |
69 | ||
70 | static void ipath_vma_close(struct vm_area_struct *vma) | |
71 | { | |
72 | struct ipath_mmap_info *ip = vma->vm_private_data; | |
73 | ||
373d9915 RC |
74 | kref_put(&ip->ref, ipath_release_mmap_info); |
75 | } | |
76 | ||
f0f37e2f | 77 | static const struct vm_operations_struct ipath_vm_ops = { |
373d9915 RC |
78 | .open = ipath_vma_open, |
79 | .close = ipath_vma_close, | |
80 | }; | |
81 | ||
82 | /** | |
83 | * ipath_mmap - create a new mmap region | |
84 | * @context: the IB user context of the process making the mmap() call | |
85 | * @vma: the VMA to be initialized | |
86 | * Return zero if the mmap is OK. Otherwise, return an errno. | |
87 | */ | |
88 | int ipath_mmap(struct ib_ucontext *context, struct vm_area_struct *vma) | |
89 | { | |
90 | struct ipath_ibdev *dev = to_idev(context->device); | |
91 | unsigned long offset = vma->vm_pgoff << PAGE_SHIFT; | |
92 | unsigned long size = vma->vm_end - vma->vm_start; | |
6b66b2da | 93 | struct ipath_mmap_info *ip, *pp; |
373d9915 RC |
94 | int ret = -EINVAL; |
95 | ||
96 | /* | |
97 | * Search the device's list of objects waiting for a mmap call. | |
98 | * Normally, this list is very short since a call to create a | |
99 | * CQ, QP, or SRQ is soon followed by a call to mmap(). | |
100 | */ | |
101 | spin_lock_irq(&dev->pending_lock); | |
6b66b2da RW |
102 | list_for_each_entry_safe(ip, pp, &dev->pending_mmaps, |
103 | pending_mmaps) { | |
373d9915 | 104 | /* Only the creator is allowed to mmap the object */ |
6b66b2da | 105 | if (context != ip->context || (__u64) offset != ip->offset) |
373d9915 RC |
106 | continue; |
107 | /* Don't allow a mmap larger than the object. */ | |
108 | if (size > ip->size) | |
109 | break; | |
110 | ||
6b66b2da | 111 | list_del_init(&ip->pending_mmaps); |
373d9915 RC |
112 | spin_unlock_irq(&dev->pending_lock); |
113 | ||
114 | ret = remap_vmalloc_range(vma, ip->obj, 0); | |
115 | if (ret) | |
116 | goto done; | |
117 | vma->vm_ops = &ipath_vm_ops; | |
118 | vma->vm_private_data = ip; | |
119 | ipath_vma_open(vma); | |
120 | goto done; | |
121 | } | |
122 | spin_unlock_irq(&dev->pending_lock); | |
123 | done: | |
124 | return ret; | |
125 | } | |
6b66b2da RW |
126 | |
127 | /* | |
128 | * Allocate information for ipath_mmap | |
129 | */ | |
130 | struct ipath_mmap_info *ipath_create_mmap_info(struct ipath_ibdev *dev, | |
131 | u32 size, | |
132 | struct ib_ucontext *context, | |
133 | void *obj) { | |
134 | struct ipath_mmap_info *ip; | |
135 | ||
136 | ip = kmalloc(sizeof *ip, GFP_KERNEL); | |
137 | if (!ip) | |
138 | goto bail; | |
139 | ||
140 | size = PAGE_ALIGN(size); | |
141 | ||
142 | spin_lock_irq(&dev->mmap_offset_lock); | |
143 | if (dev->mmap_offset == 0) | |
144 | dev->mmap_offset = PAGE_SIZE; | |
145 | ip->offset = dev->mmap_offset; | |
146 | dev->mmap_offset += size; | |
147 | spin_unlock_irq(&dev->mmap_offset_lock); | |
148 | ||
149 | INIT_LIST_HEAD(&ip->pending_mmaps); | |
150 | ip->size = size; | |
151 | ip->context = context; | |
152 | ip->obj = obj; | |
153 | kref_init(&ip->ref); | |
154 | ||
155 | bail: | |
156 | return ip; | |
157 | } | |
158 | ||
159 | void ipath_update_mmap_info(struct ipath_ibdev *dev, | |
160 | struct ipath_mmap_info *ip, | |
161 | u32 size, void *obj) { | |
162 | size = PAGE_ALIGN(size); | |
163 | ||
164 | spin_lock_irq(&dev->mmap_offset_lock); | |
165 | if (dev->mmap_offset == 0) | |
166 | dev->mmap_offset = PAGE_SIZE; | |
167 | ip->offset = dev->mmap_offset; | |
168 | dev->mmap_offset += size; | |
169 | spin_unlock_irq(&dev->mmap_offset_lock); | |
170 | ||
171 | ip->size = size; | |
172 | ip->obj = obj; | |
173 | } |