Roland Dreier | eb8ffbf | 2005-07-07 17:57:14 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2005 Topspin Communications. All rights reserved. |
| 3 | * Copyright (c) 2005 Cisco Systems. All rights reserved. |
Roland Dreier | 2a1d9b7 | 2005-08-10 23:03:10 -0700 | [diff] [blame] | 4 | * Copyright (c) 2005 Mellanox Technologies. All rights reserved. |
Roland Dreier | eb8ffbf | 2005-07-07 17:57:14 -0700 | [diff] [blame] | 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. |
Roland Dreier | eb8ffbf | 2005-07-07 17:57:14 -0700 | [diff] [blame] | 33 | */ |
| 34 | |
| 35 | #include <linux/mm.h> |
| 36 | #include <linux/dma-mapping.h> |
Alexey Dobriyan | e8edc6e | 2007-05-21 01:22:52 +0400 | [diff] [blame] | 37 | #include <linux/sched.h> |
Paul Gortmaker | b108d97 | 2011-05-27 15:29:33 -0400 | [diff] [blame] | 38 | #include <linux/export.h> |
Joachim Fenkes | c8d8bee | 2007-09-13 18:15:28 +0200 | [diff] [blame] | 39 | #include <linux/hugetlb.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 40 | #include <linux/slab.h> |
Shachar Raindel | 8ada2c1 | 2014-12-11 17:04:17 +0200 | [diff] [blame] | 41 | #include <rdma/ib_umem_odp.h> |
Roland Dreier | eb8ffbf | 2005-07-07 17:57:14 -0700 | [diff] [blame] | 42 | |
| 43 | #include "uverbs.h" |
| 44 | |
Dotan Barak | 92ddc44 | 2007-08-01 13:33:56 +0300 | [diff] [blame] | 45 | |
Roland Dreier | eb8ffbf | 2005-07-07 17:57:14 -0700 | [diff] [blame] | 46 | static void __ib_umem_release(struct ib_device *dev, struct ib_umem *umem, int dirty) |
| 47 | { |
Yishai Hadas | eeb8461 | 2014-01-28 13:40:15 +0200 | [diff] [blame] | 48 | struct scatterlist *sg; |
| 49 | struct page *page; |
Roland Dreier | eb8ffbf | 2005-07-07 17:57:14 -0700 | [diff] [blame] | 50 | int i; |
| 51 | |
Yishai Hadas | eeb8461 | 2014-01-28 13:40:15 +0200 | [diff] [blame] | 52 | if (umem->nmap > 0) |
| 53 | ib_dma_unmap_sg(dev, umem->sg_head.sgl, |
| 54 | umem->nmap, |
| 55 | DMA_BIDIRECTIONAL); |
Jens Axboe | 45711f1 | 2007-10-22 21:19:53 +0200 | [diff] [blame] | 56 | |
Yishai Hadas | eeb8461 | 2014-01-28 13:40:15 +0200 | [diff] [blame] | 57 | for_each_sg(umem->sg_head.sgl, sg, umem->npages, i) { |
Roland Dreier | eb8ffbf | 2005-07-07 17:57:14 -0700 | [diff] [blame] | 58 | |
Yishai Hadas | eeb8461 | 2014-01-28 13:40:15 +0200 | [diff] [blame] | 59 | page = sg_page(sg); |
| 60 | if (umem->writable && dirty) |
| 61 | set_page_dirty_lock(page); |
| 62 | put_page(page); |
Roland Dreier | eb8ffbf | 2005-07-07 17:57:14 -0700 | [diff] [blame] | 63 | } |
Yishai Hadas | eeb8461 | 2014-01-28 13:40:15 +0200 | [diff] [blame] | 64 | |
| 65 | sg_free_table(&umem->sg_head); |
| 66 | return; |
| 67 | |
Roland Dreier | eb8ffbf | 2005-07-07 17:57:14 -0700 | [diff] [blame] | 68 | } |
| 69 | |
Roland Dreier | f7c6a7b | 2007-03-04 16:15:11 -0800 | [diff] [blame] | 70 | /** |
| 71 | * ib_umem_get - Pin and DMA map userspace memory. |
Shachar Raindel | 8ada2c1 | 2014-12-11 17:04:17 +0200 | [diff] [blame] | 72 | * |
| 73 | * If access flags indicate ODP memory, avoid pinning. Instead, stores |
Haggai Eran | 882214e | 2014-12-11 17:04:18 +0200 | [diff] [blame] | 74 | * the mm for future page fault handling in conjunction with MMU notifiers. |
Shachar Raindel | 8ada2c1 | 2014-12-11 17:04:17 +0200 | [diff] [blame] | 75 | * |
Roland Dreier | f7c6a7b | 2007-03-04 16:15:11 -0800 | [diff] [blame] | 76 | * @context: userspace context to pin memory for |
| 77 | * @addr: userspace virtual address to start at |
| 78 | * @size: length of region to pin |
| 79 | * @access: IB_ACCESS_xxx flags for memory being pinned |
Arthur Kepner | cb9fbc5 | 2008-04-29 01:00:34 -0700 | [diff] [blame] | 80 | * @dmasync: flush in-flight DMA when the memory region is written |
Roland Dreier | f7c6a7b | 2007-03-04 16:15:11 -0800 | [diff] [blame] | 81 | */ |
| 82 | struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr, |
Arthur Kepner | cb9fbc5 | 2008-04-29 01:00:34 -0700 | [diff] [blame] | 83 | size_t size, int access, int dmasync) |
Roland Dreier | eb8ffbf | 2005-07-07 17:57:14 -0700 | [diff] [blame] | 84 | { |
Roland Dreier | f7c6a7b | 2007-03-04 16:15:11 -0800 | [diff] [blame] | 85 | struct ib_umem *umem; |
Roland Dreier | eb8ffbf | 2005-07-07 17:57:14 -0700 | [diff] [blame] | 86 | struct page **page_list; |
Joachim Fenkes | c8d8bee | 2007-09-13 18:15:28 +0200 | [diff] [blame] | 87 | struct vm_area_struct **vma_list; |
Roland Dreier | eb8ffbf | 2005-07-07 17:57:14 -0700 | [diff] [blame] | 88 | unsigned long locked; |
| 89 | unsigned long lock_limit; |
| 90 | unsigned long cur_base; |
| 91 | unsigned long npages; |
Roland Dreier | f7c6a7b | 2007-03-04 16:15:11 -0800 | [diff] [blame] | 92 | int ret; |
Roland Dreier | eb8ffbf | 2005-07-07 17:57:14 -0700 | [diff] [blame] | 93 | int i; |
Krzysztof Kozlowski | 00085f1 | 2016-08-03 13:46:00 -0700 | [diff] [blame] | 94 | unsigned long dma_attrs = 0; |
Yishai Hadas | eeb8461 | 2014-01-28 13:40:15 +0200 | [diff] [blame] | 95 | struct scatterlist *sg, *sg_list_start; |
| 96 | int need_release = 0; |
Lorenzo Stoakes | 768ae30 | 2016-10-13 01:20:16 +0100 | [diff] [blame] | 97 | unsigned int gup_flags = FOLL_WRITE; |
Arthur Kepner | cb9fbc5 | 2008-04-29 01:00:34 -0700 | [diff] [blame] | 98 | |
| 99 | if (dmasync) |
Krzysztof Kozlowski | 00085f1 | 2016-08-03 13:46:00 -0700 | [diff] [blame] | 100 | dma_attrs |= DMA_ATTR_WRITE_BARRIER; |
Roland Dreier | eb8ffbf | 2005-07-07 17:57:14 -0700 | [diff] [blame] | 101 | |
Yann Droneaud | 8abaae6 | 2015-04-13 14:56:22 +0200 | [diff] [blame] | 102 | if (!size) |
| 103 | return ERR_PTR(-EINVAL); |
| 104 | |
Shachar Raindel | 8494057 | 2015-03-18 17:39:08 +0000 | [diff] [blame] | 105 | /* |
| 106 | * If the combination of the addr and size requested for this memory |
| 107 | * region causes an integer overflow, return error. |
| 108 | */ |
Yann Droneaud | 66578b0 | 2015-04-13 14:56:23 +0200 | [diff] [blame] | 109 | if (((addr + size) < addr) || |
| 110 | PAGE_ALIGN(addr + size) < (addr + size)) |
Shachar Raindel | 8494057 | 2015-03-18 17:39:08 +0000 | [diff] [blame] | 111 | return ERR_PTR(-EINVAL); |
| 112 | |
Roland Dreier | eb8ffbf | 2005-07-07 17:57:14 -0700 | [diff] [blame] | 113 | if (!can_do_mlock()) |
Roland Dreier | f7c6a7b | 2007-03-04 16:15:11 -0800 | [diff] [blame] | 114 | return ERR_PTR(-EPERM); |
| 115 | |
Yishai Hadas | eeb8461 | 2014-01-28 13:40:15 +0200 | [diff] [blame] | 116 | umem = kzalloc(sizeof *umem, GFP_KERNEL); |
Roland Dreier | f7c6a7b | 2007-03-04 16:15:11 -0800 | [diff] [blame] | 117 | if (!umem) |
| 118 | return ERR_PTR(-ENOMEM); |
| 119 | |
| 120 | umem->context = context; |
| 121 | umem->length = size; |
Haggai Eran | 406f9e5 | 2014-12-11 17:04:12 +0200 | [diff] [blame] | 122 | umem->address = addr; |
Roland Dreier | f7c6a7b | 2007-03-04 16:15:11 -0800 | [diff] [blame] | 123 | umem->page_size = PAGE_SIZE; |
Shawn Bohrer | 87773dd | 2014-09-03 12:13:57 -0500 | [diff] [blame] | 124 | umem->pid = get_task_pid(current, PIDTYPE_PID); |
Jack Morgenstein | 11410f9 | 2018-05-23 15:30:30 +0300 | [diff] [blame^] | 125 | umem->writable = ib_access_writable(access); |
Roland Dreier | f7c6a7b | 2007-03-04 16:15:11 -0800 | [diff] [blame] | 126 | |
Shachar Raindel | 8ada2c1 | 2014-12-11 17:04:17 +0200 | [diff] [blame] | 127 | if (access & IB_ACCESS_ON_DEMAND) { |
Kenneth Lee | c81ee4e | 2017-01-05 15:00:05 +0800 | [diff] [blame] | 128 | put_pid(umem->pid); |
Shachar Raindel | 8ada2c1 | 2014-12-11 17:04:17 +0200 | [diff] [blame] | 129 | ret = ib_umem_odp_get(context, umem); |
| 130 | if (ret) { |
| 131 | kfree(umem); |
| 132 | return ERR_PTR(ret); |
| 133 | } |
| 134 | return umem; |
| 135 | } |
| 136 | |
| 137 | umem->odp_data = NULL; |
| 138 | |
Joachim Fenkes | c8d8bee | 2007-09-13 18:15:28 +0200 | [diff] [blame] | 139 | /* We assume the memory is from hugetlb until proved otherwise */ |
| 140 | umem->hugetlb = 1; |
| 141 | |
Roland Dreier | eb8ffbf | 2005-07-07 17:57:14 -0700 | [diff] [blame] | 142 | page_list = (struct page **) __get_free_page(GFP_KERNEL); |
Roland Dreier | f7c6a7b | 2007-03-04 16:15:11 -0800 | [diff] [blame] | 143 | if (!page_list) { |
Kenneth Lee | c81ee4e | 2017-01-05 15:00:05 +0800 | [diff] [blame] | 144 | put_pid(umem->pid); |
Roland Dreier | f7c6a7b | 2007-03-04 16:15:11 -0800 | [diff] [blame] | 145 | kfree(umem); |
| 146 | return ERR_PTR(-ENOMEM); |
| 147 | } |
Roland Dreier | eb8ffbf | 2005-07-07 17:57:14 -0700 | [diff] [blame] | 148 | |
Joachim Fenkes | c8d8bee | 2007-09-13 18:15:28 +0200 | [diff] [blame] | 149 | /* |
| 150 | * if we can't alloc the vma_list, it's not so bad; |
| 151 | * just assume the memory is not hugetlb memory |
| 152 | */ |
| 153 | vma_list = (struct vm_area_struct **) __get_free_page(GFP_KERNEL); |
| 154 | if (!vma_list) |
| 155 | umem->hugetlb = 0; |
| 156 | |
Haggai Eran | 406f9e5 | 2014-12-11 17:04:12 +0200 | [diff] [blame] | 157 | npages = ib_umem_num_pages(umem); |
Roland Dreier | eb8ffbf | 2005-07-07 17:57:14 -0700 | [diff] [blame] | 158 | |
| 159 | down_write(¤t->mm->mmap_sem); |
| 160 | |
Christoph Lameter | bc3e53f | 2011-10-31 17:07:30 -0700 | [diff] [blame] | 161 | locked = npages + current->mm->pinned_vm; |
Jiri Slaby | ccbe9f0 | 2010-02-11 15:40:48 -0800 | [diff] [blame] | 162 | lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; |
Roland Dreier | eb8ffbf | 2005-07-07 17:57:14 -0700 | [diff] [blame] | 163 | |
| 164 | if ((locked > lock_limit) && !capable(CAP_IPC_LOCK)) { |
| 165 | ret = -ENOMEM; |
| 166 | goto out; |
| 167 | } |
| 168 | |
Roland Dreier | f7c6a7b | 2007-03-04 16:15:11 -0800 | [diff] [blame] | 169 | cur_base = addr & PAGE_MASK; |
Roland Dreier | eb8ffbf | 2005-07-07 17:57:14 -0700 | [diff] [blame] | 170 | |
Mark Bloch | 3c7ba57 | 2016-10-27 16:36:31 +0300 | [diff] [blame] | 171 | if (npages == 0 || npages > UINT_MAX) { |
Yishai Hadas | eeb8461 | 2014-01-28 13:40:15 +0200 | [diff] [blame] | 172 | ret = -EINVAL; |
| 173 | goto out; |
| 174 | } |
| 175 | |
| 176 | ret = sg_alloc_table(&umem->sg_head, npages, GFP_KERNEL); |
| 177 | if (ret) |
| 178 | goto out; |
| 179 | |
Lorenzo Stoakes | 768ae30 | 2016-10-13 01:20:16 +0100 | [diff] [blame] | 180 | if (!umem->writable) |
| 181 | gup_flags |= FOLL_FORCE; |
| 182 | |
Yishai Hadas | eeb8461 | 2014-01-28 13:40:15 +0200 | [diff] [blame] | 183 | need_release = 1; |
| 184 | sg_list_start = umem->sg_head.sgl; |
| 185 | |
Roland Dreier | eb8ffbf | 2005-07-07 17:57:14 -0700 | [diff] [blame] | 186 | while (npages) { |
Dan Williams | 00a6e63 | 2018-02-23 14:06:00 -0800 | [diff] [blame] | 187 | ret = get_user_pages_longterm(cur_base, |
Roland Dreier | 8079ffa | 2008-06-06 21:38:37 -0700 | [diff] [blame] | 188 | min_t(unsigned long, npages, |
Roland Dreier | eb8ffbf | 2005-07-07 17:57:14 -0700 | [diff] [blame] | 189 | PAGE_SIZE / sizeof (struct page *)), |
Lorenzo Stoakes | 768ae30 | 2016-10-13 01:20:16 +0100 | [diff] [blame] | 190 | gup_flags, page_list, vma_list); |
Roland Dreier | eb8ffbf | 2005-07-07 17:57:14 -0700 | [diff] [blame] | 191 | |
| 192 | if (ret < 0) |
| 193 | goto out; |
| 194 | |
Yishai Hadas | eeb8461 | 2014-01-28 13:40:15 +0200 | [diff] [blame] | 195 | umem->npages += ret; |
Roland Dreier | eb8ffbf | 2005-07-07 17:57:14 -0700 | [diff] [blame] | 196 | cur_base += ret * PAGE_SIZE; |
| 197 | npages -= ret; |
| 198 | |
Yishai Hadas | eeb8461 | 2014-01-28 13:40:15 +0200 | [diff] [blame] | 199 | for_each_sg(sg_list_start, sg, ret, i) { |
| 200 | if (vma_list && !is_vm_hugetlb_page(vma_list[i])) |
| 201 | umem->hugetlb = 0; |
Roland Dreier | eb8ffbf | 2005-07-07 17:57:14 -0700 | [diff] [blame] | 202 | |
Yishai Hadas | eeb8461 | 2014-01-28 13:40:15 +0200 | [diff] [blame] | 203 | sg_set_page(sg, page_list[i], PAGE_SIZE, 0); |
Roland Dreier | eb8ffbf | 2005-07-07 17:57:14 -0700 | [diff] [blame] | 204 | } |
| 205 | |
Yishai Hadas | eeb8461 | 2014-01-28 13:40:15 +0200 | [diff] [blame] | 206 | /* preparing for next loop */ |
| 207 | sg_list_start = sg; |
Roland Dreier | eb8ffbf | 2005-07-07 17:57:14 -0700 | [diff] [blame] | 208 | } |
| 209 | |
Yishai Hadas | eeb8461 | 2014-01-28 13:40:15 +0200 | [diff] [blame] | 210 | umem->nmap = ib_dma_map_sg_attrs(context->device, |
| 211 | umem->sg_head.sgl, |
| 212 | umem->npages, |
| 213 | DMA_BIDIRECTIONAL, |
Krzysztof Kozlowski | 00085f1 | 2016-08-03 13:46:00 -0700 | [diff] [blame] | 214 | dma_attrs); |
Yishai Hadas | eeb8461 | 2014-01-28 13:40:15 +0200 | [diff] [blame] | 215 | |
| 216 | if (umem->nmap <= 0) { |
| 217 | ret = -ENOMEM; |
| 218 | goto out; |
| 219 | } |
| 220 | |
| 221 | ret = 0; |
| 222 | |
Roland Dreier | eb8ffbf | 2005-07-07 17:57:14 -0700 | [diff] [blame] | 223 | out: |
Roland Dreier | f7c6a7b | 2007-03-04 16:15:11 -0800 | [diff] [blame] | 224 | if (ret < 0) { |
Yishai Hadas | eeb8461 | 2014-01-28 13:40:15 +0200 | [diff] [blame] | 225 | if (need_release) |
| 226 | __ib_umem_release(context->device, umem, 0); |
Shawn Bohrer | 87773dd | 2014-09-03 12:13:57 -0500 | [diff] [blame] | 227 | put_pid(umem->pid); |
Roland Dreier | f7c6a7b | 2007-03-04 16:15:11 -0800 | [diff] [blame] | 228 | kfree(umem); |
| 229 | } else |
Christoph Lameter | bc3e53f | 2011-10-31 17:07:30 -0700 | [diff] [blame] | 230 | current->mm->pinned_vm = locked; |
Roland Dreier | eb8ffbf | 2005-07-07 17:57:14 -0700 | [diff] [blame] | 231 | |
| 232 | up_write(¤t->mm->mmap_sem); |
Joachim Fenkes | c8d8bee | 2007-09-13 18:15:28 +0200 | [diff] [blame] | 233 | if (vma_list) |
| 234 | free_page((unsigned long) vma_list); |
Roland Dreier | eb8ffbf | 2005-07-07 17:57:14 -0700 | [diff] [blame] | 235 | free_page((unsigned long) page_list); |
| 236 | |
Roland Dreier | f7c6a7b | 2007-03-04 16:15:11 -0800 | [diff] [blame] | 237 | return ret < 0 ? ERR_PTR(ret) : umem; |
Roland Dreier | eb8ffbf | 2005-07-07 17:57:14 -0700 | [diff] [blame] | 238 | } |
Roland Dreier | f7c6a7b | 2007-03-04 16:15:11 -0800 | [diff] [blame] | 239 | EXPORT_SYMBOL(ib_umem_get); |
Roland Dreier | eb8ffbf | 2005-07-07 17:57:14 -0700 | [diff] [blame] | 240 | |
Roland Dreier | 1bf66a3 | 2007-04-18 20:20:28 -0700 | [diff] [blame] | 241 | static void ib_umem_account(struct work_struct *work) |
Roland Dreier | eb8ffbf | 2005-07-07 17:57:14 -0700 | [diff] [blame] | 242 | { |
Roland Dreier | 1bf66a3 | 2007-04-18 20:20:28 -0700 | [diff] [blame] | 243 | struct ib_umem *umem = container_of(work, struct ib_umem, work); |
Roland Dreier | eb8ffbf | 2005-07-07 17:57:14 -0700 | [diff] [blame] | 244 | |
Roland Dreier | 1bf66a3 | 2007-04-18 20:20:28 -0700 | [diff] [blame] | 245 | down_write(&umem->mm->mmap_sem); |
Christoph Lameter | bc3e53f | 2011-10-31 17:07:30 -0700 | [diff] [blame] | 246 | umem->mm->pinned_vm -= umem->diff; |
Roland Dreier | 1bf66a3 | 2007-04-18 20:20:28 -0700 | [diff] [blame] | 247 | up_write(&umem->mm->mmap_sem); |
| 248 | mmput(umem->mm); |
| 249 | kfree(umem); |
Roland Dreier | eb8ffbf | 2005-07-07 17:57:14 -0700 | [diff] [blame] | 250 | } |
| 251 | |
Roland Dreier | f7c6a7b | 2007-03-04 16:15:11 -0800 | [diff] [blame] | 252 | /** |
| 253 | * ib_umem_release - release memory pinned with ib_umem_get |
| 254 | * @umem: umem struct to release |
| 255 | */ |
| 256 | void ib_umem_release(struct ib_umem *umem) |
Roland Dreier | eb8ffbf | 2005-07-07 17:57:14 -0700 | [diff] [blame] | 257 | { |
Roland Dreier | f7c6a7b | 2007-03-04 16:15:11 -0800 | [diff] [blame] | 258 | struct ib_ucontext *context = umem->context; |
Roland Dreier | eb8ffbf | 2005-07-07 17:57:14 -0700 | [diff] [blame] | 259 | struct mm_struct *mm; |
Shawn Bohrer | 87773dd | 2014-09-03 12:13:57 -0500 | [diff] [blame] | 260 | struct task_struct *task; |
Roland Dreier | f7c6a7b | 2007-03-04 16:15:11 -0800 | [diff] [blame] | 261 | unsigned long diff; |
Roland Dreier | eb8ffbf | 2005-07-07 17:57:14 -0700 | [diff] [blame] | 262 | |
Shachar Raindel | 8ada2c1 | 2014-12-11 17:04:17 +0200 | [diff] [blame] | 263 | if (umem->odp_data) { |
| 264 | ib_umem_odp_release(umem); |
| 265 | return; |
| 266 | } |
| 267 | |
Roland Dreier | f7c6a7b | 2007-03-04 16:15:11 -0800 | [diff] [blame] | 268 | __ib_umem_release(umem->context->device, umem, 1); |
Roland Dreier | eb8ffbf | 2005-07-07 17:57:14 -0700 | [diff] [blame] | 269 | |
Shawn Bohrer | 87773dd | 2014-09-03 12:13:57 -0500 | [diff] [blame] | 270 | task = get_pid_task(umem->pid, PIDTYPE_PID); |
| 271 | put_pid(umem->pid); |
| 272 | if (!task) |
| 273 | goto out; |
| 274 | mm = get_task_mm(task); |
| 275 | put_task_struct(task); |
| 276 | if (!mm) |
| 277 | goto out; |
Roland Dreier | eb8ffbf | 2005-07-07 17:57:14 -0700 | [diff] [blame] | 278 | |
Haggai Eran | 406f9e5 | 2014-12-11 17:04:12 +0200 | [diff] [blame] | 279 | diff = ib_umem_num_pages(umem); |
Roland Dreier | f7c6a7b | 2007-03-04 16:15:11 -0800 | [diff] [blame] | 280 | |
Roland Dreier | eb8ffbf | 2005-07-07 17:57:14 -0700 | [diff] [blame] | 281 | /* |
| 282 | * We may be called with the mm's mmap_sem already held. This |
| 283 | * can happen when a userspace munmap() is the call that drops |
| 284 | * the last reference to our file and calls our release |
| 285 | * method. If there are memory regions to destroy, we'll end |
Roland Dreier | f7c6a7b | 2007-03-04 16:15:11 -0800 | [diff] [blame] | 286 | * up here and not be able to take the mmap_sem. In that case |
| 287 | * we defer the vm_locked accounting to the system workqueue. |
Roland Dreier | eb8ffbf | 2005-07-07 17:57:14 -0700 | [diff] [blame] | 288 | */ |
Roland Dreier | 24bce50 | 2007-06-21 11:05:58 -0700 | [diff] [blame] | 289 | if (context->closing) { |
| 290 | if (!down_write_trylock(&mm->mmap_sem)) { |
| 291 | INIT_WORK(&umem->work, ib_umem_account); |
| 292 | umem->mm = mm; |
| 293 | umem->diff = diff; |
Roland Dreier | eb8ffbf | 2005-07-07 17:57:14 -0700 | [diff] [blame] | 294 | |
Tejun Heo | f062671 | 2010-10-19 15:24:36 +0000 | [diff] [blame] | 295 | queue_work(ib_wq, &umem->work); |
Roland Dreier | 24bce50 | 2007-06-21 11:05:58 -0700 | [diff] [blame] | 296 | return; |
| 297 | } |
Roland Dreier | f7c6a7b | 2007-03-04 16:15:11 -0800 | [diff] [blame] | 298 | } else |
| 299 | down_write(&mm->mmap_sem); |
Roland Dreier | eb8ffbf | 2005-07-07 17:57:14 -0700 | [diff] [blame] | 300 | |
Shawn Bohrer | 87773dd | 2014-09-03 12:13:57 -0500 | [diff] [blame] | 301 | mm->pinned_vm -= diff; |
Roland Dreier | f7c6a7b | 2007-03-04 16:15:11 -0800 | [diff] [blame] | 302 | up_write(&mm->mmap_sem); |
| 303 | mmput(mm); |
Shawn Bohrer | 87773dd | 2014-09-03 12:13:57 -0500 | [diff] [blame] | 304 | out: |
Roland Dreier | 1bf66a3 | 2007-04-18 20:20:28 -0700 | [diff] [blame] | 305 | kfree(umem); |
Roland Dreier | eb8ffbf | 2005-07-07 17:57:14 -0700 | [diff] [blame] | 306 | } |
Roland Dreier | f7c6a7b | 2007-03-04 16:15:11 -0800 | [diff] [blame] | 307 | EXPORT_SYMBOL(ib_umem_release); |
| 308 | |
| 309 | int ib_umem_page_count(struct ib_umem *umem) |
| 310 | { |
Roland Dreier | f7c6a7b | 2007-03-04 16:15:11 -0800 | [diff] [blame] | 311 | int shift; |
| 312 | int i; |
| 313 | int n; |
Yishai Hadas | eeb8461 | 2014-01-28 13:40:15 +0200 | [diff] [blame] | 314 | struct scatterlist *sg; |
Roland Dreier | f7c6a7b | 2007-03-04 16:15:11 -0800 | [diff] [blame] | 315 | |
Shachar Raindel | 8ada2c1 | 2014-12-11 17:04:17 +0200 | [diff] [blame] | 316 | if (umem->odp_data) |
| 317 | return ib_umem_num_pages(umem); |
| 318 | |
Roland Dreier | f7c6a7b | 2007-03-04 16:15:11 -0800 | [diff] [blame] | 319 | shift = ilog2(umem->page_size); |
| 320 | |
| 321 | n = 0; |
Yishai Hadas | eeb8461 | 2014-01-28 13:40:15 +0200 | [diff] [blame] | 322 | for_each_sg(umem->sg_head.sgl, sg, umem->nmap, i) |
| 323 | n += sg_dma_len(sg) >> shift; |
Roland Dreier | f7c6a7b | 2007-03-04 16:15:11 -0800 | [diff] [blame] | 324 | |
| 325 | return n; |
| 326 | } |
| 327 | EXPORT_SYMBOL(ib_umem_page_count); |
Haggai Eran | c5d76f1 | 2014-12-11 17:04:13 +0200 | [diff] [blame] | 328 | |
| 329 | /* |
| 330 | * Copy from the given ib_umem's pages to the given buffer. |
| 331 | * |
| 332 | * umem - the umem to copy from |
| 333 | * offset - offset to start copying from |
| 334 | * dst - destination buffer |
| 335 | * length - buffer length |
| 336 | * |
| 337 | * Returns 0 on success, or an error code. |
| 338 | */ |
| 339 | int ib_umem_copy_from(void *dst, struct ib_umem *umem, size_t offset, |
| 340 | size_t length) |
| 341 | { |
| 342 | size_t end = offset + length; |
| 343 | int ret; |
| 344 | |
| 345 | if (offset > umem->length || length > umem->length - offset) { |
| 346 | pr_err("ib_umem_copy_from not in range. offset: %zd umem length: %zd end: %zd\n", |
| 347 | offset, umem->length, end); |
| 348 | return -EINVAL; |
| 349 | } |
| 350 | |
Artemy Kovalyov | 37c704e | 2017-11-14 14:51:59 +0200 | [diff] [blame] | 351 | ret = sg_pcopy_to_buffer(umem->sg_head.sgl, umem->npages, dst, length, |
Haggai Eran | c5d76f1 | 2014-12-11 17:04:13 +0200 | [diff] [blame] | 352 | offset + ib_umem_offset(umem)); |
| 353 | |
| 354 | if (ret < 0) |
| 355 | return ret; |
| 356 | else if (ret != length) |
| 357 | return -EINVAL; |
| 358 | else |
| 359 | return 0; |
| 360 | } |
| 361 | EXPORT_SYMBOL(ib_umem_copy_from); |