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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> | |
5a0e3ad6 | 35 | #include <linux/slab.h> |
373d9915 RC |
36 | #include <linux/mm.h> |
37 | #include <linux/errno.h> | |
38 | #include <asm/pgtable.h> | |
39 | ||
40 | #include "ipath_verbs.h" | |
41 | ||
42 | /** | |
43 | * ipath_release_mmap_info - free mmap info structure | |
44 | * @ref: a pointer to the kref within struct ipath_mmap_info | |
45 | */ | |
46 | void ipath_release_mmap_info(struct kref *ref) | |
47 | { | |
48 | struct ipath_mmap_info *ip = | |
49 | container_of(ref, struct ipath_mmap_info, ref); | |
6b66b2da RW |
50 | struct ipath_ibdev *dev = to_idev(ip->context->device); |
51 | ||
52 | spin_lock_irq(&dev->pending_lock); | |
53 | list_del(&ip->pending_mmaps); | |
54 | spin_unlock_irq(&dev->pending_lock); | |
373d9915 RC |
55 | |
56 | vfree(ip->obj); | |
57 | kfree(ip); | |
58 | } | |
59 | ||
60 | /* | |
61 | * open and close keep track of how many times the CQ is mapped, | |
62 | * to avoid releasing it. | |
63 | */ | |
64 | static void ipath_vma_open(struct vm_area_struct *vma) | |
65 | { | |
66 | struct ipath_mmap_info *ip = vma->vm_private_data; | |
67 | ||
68 | kref_get(&ip->ref); | |
373d9915 RC |
69 | } |
70 | ||
71 | static void ipath_vma_close(struct vm_area_struct *vma) | |
72 | { | |
73 | struct ipath_mmap_info *ip = vma->vm_private_data; | |
74 | ||
373d9915 RC |
75 | kref_put(&ip->ref, ipath_release_mmap_info); |
76 | } | |
77 | ||
f0f37e2f | 78 | static const struct vm_operations_struct ipath_vm_ops = { |
373d9915 RC |
79 | .open = ipath_vma_open, |
80 | .close = ipath_vma_close, | |
81 | }; | |
82 | ||
83 | /** | |
84 | * ipath_mmap - create a new mmap region | |
85 | * @context: the IB user context of the process making the mmap() call | |
86 | * @vma: the VMA to be initialized | |
87 | * Return zero if the mmap is OK. Otherwise, return an errno. | |
88 | */ | |
89 | int ipath_mmap(struct ib_ucontext *context, struct vm_area_struct *vma) | |
90 | { | |
91 | struct ipath_ibdev *dev = to_idev(context->device); | |
92 | unsigned long offset = vma->vm_pgoff << PAGE_SHIFT; | |
93 | unsigned long size = vma->vm_end - vma->vm_start; | |
6b66b2da | 94 | struct ipath_mmap_info *ip, *pp; |
373d9915 RC |
95 | int ret = -EINVAL; |
96 | ||
97 | /* | |
98 | * Search the device's list of objects waiting for a mmap call. | |
99 | * Normally, this list is very short since a call to create a | |
100 | * CQ, QP, or SRQ is soon followed by a call to mmap(). | |
101 | */ | |
102 | spin_lock_irq(&dev->pending_lock); | |
6b66b2da RW |
103 | list_for_each_entry_safe(ip, pp, &dev->pending_mmaps, |
104 | pending_mmaps) { | |
373d9915 | 105 | /* Only the creator is allowed to mmap the object */ |
6b66b2da | 106 | if (context != ip->context || (__u64) offset != ip->offset) |
373d9915 RC |
107 | continue; |
108 | /* Don't allow a mmap larger than the object. */ | |
109 | if (size > ip->size) | |
110 | break; | |
111 | ||
6b66b2da | 112 | list_del_init(&ip->pending_mmaps); |
373d9915 RC |
113 | spin_unlock_irq(&dev->pending_lock); |
114 | ||
115 | ret = remap_vmalloc_range(vma, ip->obj, 0); | |
116 | if (ret) | |
117 | goto done; | |
118 | vma->vm_ops = &ipath_vm_ops; | |
119 | vma->vm_private_data = ip; | |
120 | ipath_vma_open(vma); | |
121 | goto done; | |
122 | } | |
123 | spin_unlock_irq(&dev->pending_lock); | |
124 | done: | |
125 | return ret; | |
126 | } | |
6b66b2da RW |
127 | |
128 | /* | |
129 | * Allocate information for ipath_mmap | |
130 | */ | |
131 | struct ipath_mmap_info *ipath_create_mmap_info(struct ipath_ibdev *dev, | |
132 | u32 size, | |
133 | struct ib_ucontext *context, | |
134 | void *obj) { | |
135 | struct ipath_mmap_info *ip; | |
136 | ||
137 | ip = kmalloc(sizeof *ip, GFP_KERNEL); | |
138 | if (!ip) | |
139 | goto bail; | |
140 | ||
141 | size = PAGE_ALIGN(size); | |
142 | ||
143 | spin_lock_irq(&dev->mmap_offset_lock); | |
144 | if (dev->mmap_offset == 0) | |
145 | dev->mmap_offset = PAGE_SIZE; | |
146 | ip->offset = dev->mmap_offset; | |
147 | dev->mmap_offset += size; | |
148 | spin_unlock_irq(&dev->mmap_offset_lock); | |
149 | ||
150 | INIT_LIST_HEAD(&ip->pending_mmaps); | |
151 | ip->size = size; | |
152 | ip->context = context; | |
153 | ip->obj = obj; | |
154 | kref_init(&ip->ref); | |
155 | ||
156 | bail: | |
157 | return ip; | |
158 | } | |
159 | ||
160 | void ipath_update_mmap_info(struct ipath_ibdev *dev, | |
161 | struct ipath_mmap_info *ip, | |
162 | u32 size, void *obj) { | |
163 | size = PAGE_ALIGN(size); | |
164 | ||
165 | spin_lock_irq(&dev->mmap_offset_lock); | |
166 | if (dev->mmap_offset == 0) | |
167 | dev->mmap_offset = PAGE_SIZE; | |
168 | ip->offset = dev->mmap_offset; | |
169 | dev->mmap_offset += size; | |
170 | spin_unlock_irq(&dev->mmap_offset_lock); | |
171 | ||
172 | ip->size = size; | |
173 | ip->obj = obj; | |
174 | } |