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eb8ffbfe RD |
1 | /* |
2 | * Copyright (c) 2005 Topspin Communications. All rights reserved. | |
3 | * Copyright (c) 2005 Cisco Systems. All rights reserved. | |
2a1d9b7f | 4 | * Copyright (c) 2005 Mellanox Technologies. All rights reserved. |
eb8ffbfe RD |
5 | * |
6 | * This software is available to you under a choice of one of two | |
7 | * licenses. You may choose to be licensed under the terms of the GNU | |
8 | * General Public License (GPL) Version 2, available from the file | |
9 | * COPYING in the main directory of this source tree, or the | |
10 | * OpenIB.org BSD license below: | |
11 | * | |
12 | * Redistribution and use in source and binary forms, with or | |
13 | * without modification, are permitted provided that the following | |
14 | * conditions are met: | |
15 | * | |
16 | * - Redistributions of source code must retain the above | |
17 | * copyright notice, this list of conditions and the following | |
18 | * disclaimer. | |
19 | * | |
20 | * - Redistributions in binary form must reproduce the above | |
21 | * copyright notice, this list of conditions and the following | |
22 | * disclaimer in the documentation and/or other materials | |
23 | * provided with the distribution. | |
24 | * | |
25 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
26 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
27 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
28 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
29 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
30 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
31 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
32 | * SOFTWARE. | |
eb8ffbfe RD |
33 | */ |
34 | ||
35 | #include <linux/mm.h> | |
36 | #include <linux/dma-mapping.h> | |
e8edc6e0 | 37 | #include <linux/sched.h> |
c8d8beea | 38 | #include <linux/hugetlb.h> |
cb9fbc5c | 39 | #include <linux/dma-attrs.h> |
5a0e3ad6 | 40 | #include <linux/slab.h> |
eb8ffbfe RD |
41 | |
42 | #include "uverbs.h" | |
43 | ||
92ddc447 DB |
44 | #define IB_UMEM_MAX_PAGE_CHUNK \ |
45 | ((PAGE_SIZE - offsetof(struct ib_umem_chunk, page_list)) / \ | |
46 | ((void *) &((struct ib_umem_chunk *) 0)->page_list[1] - \ | |
47 | (void *) &((struct ib_umem_chunk *) 0)->page_list[0])) | |
48 | ||
eb8ffbfe RD |
49 | static void __ib_umem_release(struct ib_device *dev, struct ib_umem *umem, int dirty) |
50 | { | |
51 | struct ib_umem_chunk *chunk, *tmp; | |
52 | int i; | |
53 | ||
54 | list_for_each_entry_safe(chunk, tmp, &umem->chunk_list, list) { | |
1527106f RC |
55 | ib_dma_unmap_sg(dev, chunk->page_list, |
56 | chunk->nents, DMA_BIDIRECTIONAL); | |
eb8ffbfe | 57 | for (i = 0; i < chunk->nents; ++i) { |
45711f1a JA |
58 | struct page *page = sg_page(&chunk->page_list[i]); |
59 | ||
eb8ffbfe | 60 | if (umem->writable && dirty) |
45711f1a JA |
61 | set_page_dirty_lock(page); |
62 | put_page(page); | |
eb8ffbfe RD |
63 | } |
64 | ||
65 | kfree(chunk); | |
66 | } | |
67 | } | |
68 | ||
f7c6a7b5 RD |
69 | /** |
70 | * ib_umem_get - Pin and DMA map userspace memory. | |
71 | * @context: userspace context to pin memory for | |
72 | * @addr: userspace virtual address to start at | |
73 | * @size: length of region to pin | |
74 | * @access: IB_ACCESS_xxx flags for memory being pinned | |
cb9fbc5c | 75 | * @dmasync: flush in-flight DMA when the memory region is written |
f7c6a7b5 RD |
76 | */ |
77 | struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr, | |
cb9fbc5c | 78 | size_t size, int access, int dmasync) |
eb8ffbfe | 79 | { |
f7c6a7b5 | 80 | struct ib_umem *umem; |
eb8ffbfe | 81 | struct page **page_list; |
c8d8beea | 82 | struct vm_area_struct **vma_list; |
eb8ffbfe RD |
83 | struct ib_umem_chunk *chunk; |
84 | unsigned long locked; | |
85 | unsigned long lock_limit; | |
86 | unsigned long cur_base; | |
87 | unsigned long npages; | |
f7c6a7b5 | 88 | int ret; |
eb8ffbfe RD |
89 | int off; |
90 | int i; | |
cb9fbc5c AK |
91 | DEFINE_DMA_ATTRS(attrs); |
92 | ||
93 | if (dmasync) | |
94 | dma_set_attr(DMA_ATTR_WRITE_BARRIER, &attrs); | |
eb8ffbfe RD |
95 | |
96 | if (!can_do_mlock()) | |
f7c6a7b5 | 97 | return ERR_PTR(-EPERM); |
eb8ffbfe | 98 | |
f7c6a7b5 RD |
99 | umem = kmalloc(sizeof *umem, GFP_KERNEL); |
100 | if (!umem) | |
101 | return ERR_PTR(-ENOMEM); | |
eb8ffbfe | 102 | |
f7c6a7b5 RD |
103 | umem->context = context; |
104 | umem->length = size; | |
105 | umem->offset = addr & ~PAGE_MASK; | |
106 | umem->page_size = PAGE_SIZE; | |
107 | /* | |
108 | * We ask for writable memory if any access flags other than | |
109 | * "remote read" are set. "Local write" and "remote write" | |
110 | * obviously require write access. "Remote atomic" can do | |
111 | * things like fetch and add, which will modify memory, and | |
112 | * "MW bind" can change permissions by binding a window. | |
113 | */ | |
114 | umem->writable = !!(access & ~IB_ACCESS_REMOTE_READ); | |
eb8ffbfe | 115 | |
c8d8beea JF |
116 | /* We assume the memory is from hugetlb until proved otherwise */ |
117 | umem->hugetlb = 1; | |
118 | ||
f7c6a7b5 RD |
119 | INIT_LIST_HEAD(&umem->chunk_list); |
120 | ||
121 | page_list = (struct page **) __get_free_page(GFP_KERNEL); | |
122 | if (!page_list) { | |
123 | kfree(umem); | |
124 | return ERR_PTR(-ENOMEM); | |
125 | } | |
eb8ffbfe | 126 | |
c8d8beea JF |
127 | /* |
128 | * if we can't alloc the vma_list, it's not so bad; | |
129 | * just assume the memory is not hugetlb memory | |
130 | */ | |
131 | vma_list = (struct vm_area_struct **) __get_free_page(GFP_KERNEL); | |
132 | if (!vma_list) | |
133 | umem->hugetlb = 0; | |
134 | ||
f7c6a7b5 | 135 | npages = PAGE_ALIGN(size + umem->offset) >> PAGE_SHIFT; |
eb8ffbfe RD |
136 | |
137 | down_write(¤t->mm->mmap_sem); | |
138 | ||
139 | locked = npages + current->mm->locked_vm; | |
ccbe9f0b | 140 | lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; |
eb8ffbfe RD |
141 | |
142 | if ((locked > lock_limit) && !capable(CAP_IPC_LOCK)) { | |
143 | ret = -ENOMEM; | |
144 | goto out; | |
145 | } | |
146 | ||
f7c6a7b5 | 147 | cur_base = addr & PAGE_MASK; |
eb8ffbfe | 148 | |
1d3f4b90 | 149 | ret = 0; |
eb8ffbfe RD |
150 | while (npages) { |
151 | ret = get_user_pages(current, current->mm, cur_base, | |
8079ffa0 | 152 | min_t(unsigned long, npages, |
eb8ffbfe | 153 | PAGE_SIZE / sizeof (struct page *)), |
c8d8beea | 154 | 1, !umem->writable, page_list, vma_list); |
eb8ffbfe RD |
155 | |
156 | if (ret < 0) | |
157 | goto out; | |
158 | ||
159 | cur_base += ret * PAGE_SIZE; | |
160 | npages -= ret; | |
161 | ||
162 | off = 0; | |
163 | ||
164 | while (ret) { | |
165 | chunk = kmalloc(sizeof *chunk + sizeof (struct scatterlist) * | |
166 | min_t(int, ret, IB_UMEM_MAX_PAGE_CHUNK), | |
167 | GFP_KERNEL); | |
168 | if (!chunk) { | |
169 | ret = -ENOMEM; | |
170 | goto out; | |
171 | } | |
172 | ||
173 | chunk->nents = min_t(int, ret, IB_UMEM_MAX_PAGE_CHUNK); | |
45711f1a | 174 | sg_init_table(chunk->page_list, chunk->nents); |
eb8ffbfe | 175 | for (i = 0; i < chunk->nents; ++i) { |
c8d8beea JF |
176 | if (vma_list && |
177 | !is_vm_hugetlb_page(vma_list[i + off])) | |
178 | umem->hugetlb = 0; | |
642f1490 | 179 | sg_set_page(&chunk->page_list[i], page_list[i + off], PAGE_SIZE, 0); |
eb8ffbfe RD |
180 | } |
181 | ||
cb9fbc5c AK |
182 | chunk->nmap = ib_dma_map_sg_attrs(context->device, |
183 | &chunk->page_list[0], | |
184 | chunk->nents, | |
185 | DMA_BIDIRECTIONAL, | |
186 | &attrs); | |
eb8ffbfe RD |
187 | if (chunk->nmap <= 0) { |
188 | for (i = 0; i < chunk->nents; ++i) | |
45711f1a | 189 | put_page(sg_page(&chunk->page_list[i])); |
eb8ffbfe RD |
190 | kfree(chunk); |
191 | ||
192 | ret = -ENOMEM; | |
193 | goto out; | |
194 | } | |
195 | ||
196 | ret -= chunk->nents; | |
197 | off += chunk->nents; | |
f7c6a7b5 | 198 | list_add_tail(&chunk->list, &umem->chunk_list); |
eb8ffbfe RD |
199 | } |
200 | ||
201 | ret = 0; | |
202 | } | |
203 | ||
204 | out: | |
f7c6a7b5 RD |
205 | if (ret < 0) { |
206 | __ib_umem_release(context->device, umem, 0); | |
207 | kfree(umem); | |
208 | } else | |
eb8ffbfe RD |
209 | current->mm->locked_vm = locked; |
210 | ||
211 | up_write(¤t->mm->mmap_sem); | |
c8d8beea JF |
212 | if (vma_list) |
213 | free_page((unsigned long) vma_list); | |
eb8ffbfe RD |
214 | free_page((unsigned long) page_list); |
215 | ||
f7c6a7b5 | 216 | return ret < 0 ? ERR_PTR(ret) : umem; |
eb8ffbfe | 217 | } |
f7c6a7b5 | 218 | EXPORT_SYMBOL(ib_umem_get); |
eb8ffbfe | 219 | |
1bf66a30 | 220 | static void ib_umem_account(struct work_struct *work) |
eb8ffbfe | 221 | { |
1bf66a30 RD |
222 | struct ib_umem *umem = container_of(work, struct ib_umem, work); |
223 | ||
224 | down_write(&umem->mm->mmap_sem); | |
225 | umem->mm->locked_vm -= umem->diff; | |
226 | up_write(&umem->mm->mmap_sem); | |
227 | mmput(umem->mm); | |
228 | kfree(umem); | |
eb8ffbfe RD |
229 | } |
230 | ||
f7c6a7b5 RD |
231 | /** |
232 | * ib_umem_release - release memory pinned with ib_umem_get | |
233 | * @umem: umem struct to release | |
234 | */ | |
235 | void ib_umem_release(struct ib_umem *umem) | |
eb8ffbfe | 236 | { |
f7c6a7b5 | 237 | struct ib_ucontext *context = umem->context; |
eb8ffbfe | 238 | struct mm_struct *mm; |
f7c6a7b5 | 239 | unsigned long diff; |
eb8ffbfe | 240 | |
f7c6a7b5 | 241 | __ib_umem_release(umem->context->device, umem, 1); |
eb8ffbfe RD |
242 | |
243 | mm = get_task_mm(current); | |
7b82cd8e EC |
244 | if (!mm) { |
245 | kfree(umem); | |
eb8ffbfe | 246 | return; |
7b82cd8e | 247 | } |
eb8ffbfe | 248 | |
f7c6a7b5 | 249 | diff = PAGE_ALIGN(umem->length + umem->offset) >> PAGE_SHIFT; |
f7c6a7b5 | 250 | |
eb8ffbfe RD |
251 | /* |
252 | * We may be called with the mm's mmap_sem already held. This | |
253 | * can happen when a userspace munmap() is the call that drops | |
254 | * the last reference to our file and calls our release | |
255 | * method. If there are memory regions to destroy, we'll end | |
f7c6a7b5 RD |
256 | * up here and not be able to take the mmap_sem. In that case |
257 | * we defer the vm_locked accounting to the system workqueue. | |
eb8ffbfe | 258 | */ |
24bce508 RD |
259 | if (context->closing) { |
260 | if (!down_write_trylock(&mm->mmap_sem)) { | |
261 | INIT_WORK(&umem->work, ib_umem_account); | |
262 | umem->mm = mm; | |
263 | umem->diff = diff; | |
264 | ||
265 | schedule_work(&umem->work); | |
266 | return; | |
267 | } | |
f7c6a7b5 RD |
268 | } else |
269 | down_write(&mm->mmap_sem); | |
270 | ||
271 | current->mm->locked_vm -= diff; | |
272 | up_write(&mm->mmap_sem); | |
273 | mmput(mm); | |
1bf66a30 | 274 | kfree(umem); |
f7c6a7b5 RD |
275 | } |
276 | EXPORT_SYMBOL(ib_umem_release); | |
277 | ||
278 | int ib_umem_page_count(struct ib_umem *umem) | |
279 | { | |
280 | struct ib_umem_chunk *chunk; | |
281 | int shift; | |
282 | int i; | |
283 | int n; | |
284 | ||
285 | shift = ilog2(umem->page_size); | |
eb8ffbfe | 286 | |
f7c6a7b5 RD |
287 | n = 0; |
288 | list_for_each_entry(chunk, &umem->chunk_list, list) | |
289 | for (i = 0; i < chunk->nmap; ++i) | |
290 | n += sg_dma_len(&chunk->page_list[i]) >> shift; | |
eb8ffbfe | 291 | |
f7c6a7b5 | 292 | return n; |
eb8ffbfe | 293 | } |
f7c6a7b5 | 294 | EXPORT_SYMBOL(ib_umem_page_count); |