Upinder Malhi | e3cf00d | 2013-09-10 03:38:16 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2005 Topspin Communications. All rights reserved. |
| 3 | * Copyright (c) 2005 Mellanox Technologies. All rights reserved. |
| 4 | * Copyright (c) 2013 Cisco Systems. All rights reserved. |
| 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 |
Jeff Squyres | 3805ead | 2015-09-30 13:34:00 -0700 | [diff] [blame] | 10 | * BSD license below: |
Upinder Malhi | e3cf00d | 2013-09-10 03:38:16 +0000 | [diff] [blame] | 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. |
| 33 | */ |
| 34 | |
| 35 | #include <linux/mm.h> |
| 36 | #include <linux/dma-mapping.h> |
Ingo Molnar | 3f07c01 | 2017-02-08 18:51:30 +0100 | [diff] [blame] | 37 | #include <linux/sched/signal.h> |
Ingo Molnar | 6e84f31 | 2017-02-08 18:51:29 +0100 | [diff] [blame] | 38 | #include <linux/sched/mm.h> |
Upinder Malhi | e3cf00d | 2013-09-10 03:38:16 +0000 | [diff] [blame] | 39 | #include <linux/hugetlb.h> |
Upinder Malhi | e3cf00d | 2013-09-10 03:38:16 +0000 | [diff] [blame] | 40 | #include <linux/iommu.h> |
| 41 | #include <linux/workqueue.h> |
| 42 | #include <linux/list.h> |
| 43 | #include <linux/pci.h> |
| 44 | |
| 45 | #include "usnic_log.h" |
| 46 | #include "usnic_uiom.h" |
| 47 | #include "usnic_uiom_interval_tree.h" |
| 48 | |
| 49 | static struct workqueue_struct *usnic_uiom_wq; |
| 50 | |
| 51 | #define USNIC_UIOM_PAGE_CHUNK \ |
| 52 | ((PAGE_SIZE - offsetof(struct usnic_uiom_chunk, page_list)) /\ |
| 53 | ((void *) &((struct usnic_uiom_chunk *) 0)->page_list[1] - \ |
| 54 | (void *) &((struct usnic_uiom_chunk *) 0)->page_list[0])) |
| 55 | |
| 56 | static void usnic_uiom_reg_account(struct work_struct *work) |
| 57 | { |
| 58 | struct usnic_uiom_reg *umem = container_of(work, |
| 59 | struct usnic_uiom_reg, work); |
| 60 | |
| 61 | down_write(&umem->mm->mmap_sem); |
| 62 | umem->mm->locked_vm -= umem->diff; |
| 63 | up_write(&umem->mm->mmap_sem); |
| 64 | mmput(umem->mm); |
| 65 | kfree(umem); |
| 66 | } |
| 67 | |
| 68 | static int usnic_uiom_dma_fault(struct iommu_domain *domain, |
| 69 | struct device *dev, |
| 70 | unsigned long iova, int flags, |
| 71 | void *token) |
| 72 | { |
| 73 | usnic_err("Device %s iommu fault domain 0x%pK va 0x%lx flags 0x%x\n", |
| 74 | dev_name(dev), |
| 75 | domain, iova, flags); |
| 76 | return -ENOSYS; |
| 77 | } |
| 78 | |
| 79 | static void usnic_uiom_put_pages(struct list_head *chunk_list, int dirty) |
| 80 | { |
| 81 | struct usnic_uiom_chunk *chunk, *tmp; |
| 82 | struct page *page; |
Upinder Malhi | c5f855e | 2014-01-09 14:48:45 -0800 | [diff] [blame] | 83 | struct scatterlist *sg; |
Upinder Malhi | e3cf00d | 2013-09-10 03:38:16 +0000 | [diff] [blame] | 84 | int i; |
| 85 | dma_addr_t pa; |
| 86 | |
| 87 | list_for_each_entry_safe(chunk, tmp, chunk_list, list) { |
Upinder Malhi | c5f855e | 2014-01-09 14:48:45 -0800 | [diff] [blame] | 88 | for_each_sg(chunk->page_list, sg, chunk->nents, i) { |
| 89 | page = sg_page(sg); |
| 90 | pa = sg_phys(sg); |
Upinder Malhi | e3cf00d | 2013-09-10 03:38:16 +0000 | [diff] [blame] | 91 | if (dirty) |
| 92 | set_page_dirty_lock(page); |
| 93 | put_page(page); |
| 94 | usnic_dbg("pa: %pa\n", &pa); |
| 95 | } |
| 96 | kfree(chunk); |
| 97 | } |
| 98 | } |
| 99 | |
| 100 | static int usnic_uiom_get_pages(unsigned long addr, size_t size, int writable, |
| 101 | int dmasync, struct list_head *chunk_list) |
| 102 | { |
| 103 | struct page **page_list; |
Upinder Malhi | c5f855e | 2014-01-09 14:48:45 -0800 | [diff] [blame] | 104 | struct scatterlist *sg; |
Upinder Malhi | e3cf00d | 2013-09-10 03:38:16 +0000 | [diff] [blame] | 105 | struct usnic_uiom_chunk *chunk; |
| 106 | unsigned long locked; |
| 107 | unsigned long lock_limit; |
| 108 | unsigned long cur_base; |
| 109 | unsigned long npages; |
| 110 | int ret; |
| 111 | int off; |
| 112 | int i; |
| 113 | int flags; |
| 114 | dma_addr_t pa; |
Lorenzo Stoakes | 768ae30 | 2016-10-13 01:20:16 +0100 | [diff] [blame] | 115 | unsigned int gup_flags; |
Upinder Malhi | e3cf00d | 2013-09-10 03:38:16 +0000 | [diff] [blame] | 116 | |
| 117 | if (!can_do_mlock()) |
| 118 | return -EPERM; |
| 119 | |
| 120 | INIT_LIST_HEAD(chunk_list); |
| 121 | |
| 122 | page_list = (struct page **) __get_free_page(GFP_KERNEL); |
| 123 | if (!page_list) |
| 124 | return -ENOMEM; |
| 125 | |
| 126 | npages = PAGE_ALIGN(size + (addr & ~PAGE_MASK)) >> PAGE_SHIFT; |
| 127 | |
| 128 | down_write(¤t->mm->mmap_sem); |
| 129 | |
| 130 | locked = npages + current->mm->locked_vm; |
| 131 | lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; |
| 132 | |
| 133 | if ((locked > lock_limit) && !capable(CAP_IPC_LOCK)) { |
| 134 | ret = -ENOMEM; |
| 135 | goto out; |
| 136 | } |
| 137 | |
| 138 | flags = IOMMU_READ | IOMMU_CACHE; |
| 139 | flags |= (writable) ? IOMMU_WRITE : 0; |
Lorenzo Stoakes | 768ae30 | 2016-10-13 01:20:16 +0100 | [diff] [blame] | 140 | gup_flags = FOLL_WRITE; |
| 141 | gup_flags |= (writable) ? 0 : FOLL_FORCE; |
Upinder Malhi | e3cf00d | 2013-09-10 03:38:16 +0000 | [diff] [blame] | 142 | cur_base = addr & PAGE_MASK; |
| 143 | ret = 0; |
| 144 | |
| 145 | while (npages) { |
Dave Hansen | d4edcf0 | 2016-02-12 13:01:56 -0800 | [diff] [blame] | 146 | ret = get_user_pages(cur_base, |
Upinder Malhi | e3cf00d | 2013-09-10 03:38:16 +0000 | [diff] [blame] | 147 | min_t(unsigned long, npages, |
| 148 | PAGE_SIZE / sizeof(struct page *)), |
Lorenzo Stoakes | 768ae30 | 2016-10-13 01:20:16 +0100 | [diff] [blame] | 149 | gup_flags, page_list, NULL); |
Upinder Malhi | e3cf00d | 2013-09-10 03:38:16 +0000 | [diff] [blame] | 150 | |
| 151 | if (ret < 0) |
| 152 | goto out; |
| 153 | |
| 154 | npages -= ret; |
| 155 | off = 0; |
| 156 | |
| 157 | while (ret) { |
| 158 | chunk = kmalloc(sizeof(*chunk) + |
| 159 | sizeof(struct scatterlist) * |
| 160 | min_t(int, ret, USNIC_UIOM_PAGE_CHUNK), |
| 161 | GFP_KERNEL); |
| 162 | if (!chunk) { |
| 163 | ret = -ENOMEM; |
| 164 | goto out; |
| 165 | } |
| 166 | |
| 167 | chunk->nents = min_t(int, ret, USNIC_UIOM_PAGE_CHUNK); |
| 168 | sg_init_table(chunk->page_list, chunk->nents); |
Upinder Malhi | c5f855e | 2014-01-09 14:48:45 -0800 | [diff] [blame] | 169 | for_each_sg(chunk->page_list, sg, chunk->nents, i) { |
| 170 | sg_set_page(sg, page_list[i + off], |
| 171 | PAGE_SIZE, 0); |
| 172 | pa = sg_phys(sg); |
Upinder Malhi | e3cf00d | 2013-09-10 03:38:16 +0000 | [diff] [blame] | 173 | usnic_dbg("va: 0x%lx pa: %pa\n", |
| 174 | cur_base + i*PAGE_SIZE, &pa); |
| 175 | } |
| 176 | cur_base += chunk->nents * PAGE_SIZE; |
| 177 | ret -= chunk->nents; |
| 178 | off += chunk->nents; |
| 179 | list_add_tail(&chunk->list, chunk_list); |
| 180 | } |
| 181 | |
| 182 | ret = 0; |
| 183 | } |
| 184 | |
| 185 | out: |
| 186 | if (ret < 0) |
| 187 | usnic_uiom_put_pages(chunk_list, 0); |
| 188 | else |
| 189 | current->mm->locked_vm = locked; |
| 190 | |
| 191 | up_write(¤t->mm->mmap_sem); |
| 192 | free_page((unsigned long) page_list); |
| 193 | return ret; |
| 194 | } |
| 195 | |
| 196 | static void usnic_uiom_unmap_sorted_intervals(struct list_head *intervals, |
| 197 | struct usnic_uiom_pd *pd) |
| 198 | { |
| 199 | struct usnic_uiom_interval_node *interval, *tmp; |
| 200 | long unsigned va, size; |
| 201 | |
| 202 | list_for_each_entry_safe(interval, tmp, intervals, link) { |
| 203 | va = interval->start << PAGE_SHIFT; |
| 204 | size = ((interval->last - interval->start) + 1) << PAGE_SHIFT; |
| 205 | while (size > 0) { |
| 206 | /* Workaround for RH 970401 */ |
| 207 | usnic_dbg("va 0x%lx size 0x%lx", va, PAGE_SIZE); |
| 208 | iommu_unmap(pd->domain, va, PAGE_SIZE); |
| 209 | va += PAGE_SIZE; |
| 210 | size -= PAGE_SIZE; |
| 211 | } |
| 212 | } |
| 213 | } |
| 214 | |
| 215 | static void __usnic_uiom_reg_release(struct usnic_uiom_pd *pd, |
| 216 | struct usnic_uiom_reg *uiomr, |
| 217 | int dirty) |
| 218 | { |
| 219 | int npages; |
| 220 | unsigned long vpn_start, vpn_last; |
| 221 | struct usnic_uiom_interval_node *interval, *tmp; |
| 222 | int writable = 0; |
| 223 | LIST_HEAD(rm_intervals); |
| 224 | |
| 225 | npages = PAGE_ALIGN(uiomr->length + uiomr->offset) >> PAGE_SHIFT; |
| 226 | vpn_start = (uiomr->va & PAGE_MASK) >> PAGE_SHIFT; |
| 227 | vpn_last = vpn_start + npages - 1; |
| 228 | |
| 229 | spin_lock(&pd->lock); |
Davidlohr Bueso | f808c13 | 2017-09-08 16:15:08 -0700 | [diff] [blame^] | 230 | usnic_uiom_remove_interval(&pd->root, vpn_start, |
Upinder Malhi | e3cf00d | 2013-09-10 03:38:16 +0000 | [diff] [blame] | 231 | vpn_last, &rm_intervals); |
| 232 | usnic_uiom_unmap_sorted_intervals(&rm_intervals, pd); |
| 233 | |
| 234 | list_for_each_entry_safe(interval, tmp, &rm_intervals, link) { |
| 235 | if (interval->flags & IOMMU_WRITE) |
| 236 | writable = 1; |
| 237 | list_del(&interval->link); |
| 238 | kfree(interval); |
| 239 | } |
| 240 | |
| 241 | usnic_uiom_put_pages(&uiomr->chunk_list, dirty & writable); |
| 242 | spin_unlock(&pd->lock); |
| 243 | } |
| 244 | |
| 245 | static int usnic_uiom_map_sorted_intervals(struct list_head *intervals, |
| 246 | struct usnic_uiom_reg *uiomr) |
| 247 | { |
| 248 | int i, err; |
| 249 | size_t size; |
| 250 | struct usnic_uiom_chunk *chunk; |
| 251 | struct usnic_uiom_interval_node *interval_node; |
| 252 | dma_addr_t pa; |
| 253 | dma_addr_t pa_start = 0; |
| 254 | dma_addr_t pa_end = 0; |
| 255 | long int va_start = -EINVAL; |
| 256 | struct usnic_uiom_pd *pd = uiomr->pd; |
| 257 | long int va = uiomr->va & PAGE_MASK; |
| 258 | int flags = IOMMU_READ | IOMMU_CACHE; |
| 259 | |
| 260 | flags |= (uiomr->writable) ? IOMMU_WRITE : 0; |
| 261 | chunk = list_first_entry(&uiomr->chunk_list, struct usnic_uiom_chunk, |
| 262 | list); |
| 263 | list_for_each_entry(interval_node, intervals, link) { |
| 264 | iter_chunk: |
| 265 | for (i = 0; i < chunk->nents; i++, va += PAGE_SIZE) { |
| 266 | pa = sg_phys(&chunk->page_list[i]); |
| 267 | if ((va >> PAGE_SHIFT) < interval_node->start) |
| 268 | continue; |
| 269 | |
| 270 | if ((va >> PAGE_SHIFT) == interval_node->start) { |
| 271 | /* First page of the interval */ |
| 272 | va_start = va; |
| 273 | pa_start = pa; |
| 274 | pa_end = pa; |
| 275 | } |
| 276 | |
| 277 | WARN_ON(va_start == -EINVAL); |
| 278 | |
| 279 | if ((pa_end + PAGE_SIZE != pa) && |
| 280 | (pa != pa_start)) { |
| 281 | /* PAs are not contiguous */ |
| 282 | size = pa_end - pa_start + PAGE_SIZE; |
| 283 | usnic_dbg("va 0x%lx pa %pa size 0x%zx flags 0x%x", |
| 284 | va_start, &pa_start, size, flags); |
| 285 | err = iommu_map(pd->domain, va_start, pa_start, |
| 286 | size, flags); |
| 287 | if (err) { |
Fabio Estevam | 970918b | 2014-02-18 09:54:27 -0300 | [diff] [blame] | 288 | usnic_err("Failed to map va 0x%lx pa %pa size 0x%zx with err %d\n", |
Upinder Malhi | e3cf00d | 2013-09-10 03:38:16 +0000 | [diff] [blame] | 289 | va_start, &pa_start, size, err); |
| 290 | goto err_out; |
| 291 | } |
| 292 | va_start = va; |
| 293 | pa_start = pa; |
| 294 | pa_end = pa; |
| 295 | } |
| 296 | |
| 297 | if ((va >> PAGE_SHIFT) == interval_node->last) { |
| 298 | /* Last page of the interval */ |
| 299 | size = pa - pa_start + PAGE_SIZE; |
| 300 | usnic_dbg("va 0x%lx pa %pa size 0x%zx flags 0x%x\n", |
| 301 | va_start, &pa_start, size, flags); |
| 302 | err = iommu_map(pd->domain, va_start, pa_start, |
| 303 | size, flags); |
| 304 | if (err) { |
| 305 | usnic_err("Failed to map va 0x%lx pa %pa size 0x%zx with err %d\n", |
| 306 | va_start, &pa_start, size, err); |
| 307 | goto err_out; |
| 308 | } |
| 309 | break; |
| 310 | } |
| 311 | |
| 312 | if (pa != pa_start) |
| 313 | pa_end += PAGE_SIZE; |
| 314 | } |
| 315 | |
| 316 | if (i == chunk->nents) { |
| 317 | /* |
| 318 | * Hit last entry of the chunk, |
| 319 | * hence advance to next chunk |
| 320 | */ |
| 321 | chunk = list_first_entry(&chunk->list, |
| 322 | struct usnic_uiom_chunk, |
| 323 | list); |
| 324 | goto iter_chunk; |
| 325 | } |
| 326 | } |
| 327 | |
| 328 | return 0; |
| 329 | |
| 330 | err_out: |
| 331 | usnic_uiom_unmap_sorted_intervals(intervals, pd); |
| 332 | return err; |
| 333 | } |
| 334 | |
| 335 | struct usnic_uiom_reg *usnic_uiom_reg_get(struct usnic_uiom_pd *pd, |
| 336 | unsigned long addr, size_t size, |
| 337 | int writable, int dmasync) |
| 338 | { |
| 339 | struct usnic_uiom_reg *uiomr; |
| 340 | unsigned long va_base, vpn_start, vpn_last; |
| 341 | unsigned long npages; |
| 342 | int offset, err; |
| 343 | LIST_HEAD(sorted_diff_intervals); |
| 344 | |
| 345 | /* |
| 346 | * Intel IOMMU map throws an error if a translation entry is |
| 347 | * changed from read to write. This module may not unmap |
| 348 | * and then remap the entry after fixing the permission |
| 349 | * b/c this open up a small windows where hw DMA may page fault |
| 350 | * Hence, make all entries to be writable. |
| 351 | */ |
| 352 | writable = 1; |
| 353 | |
| 354 | va_base = addr & PAGE_MASK; |
| 355 | offset = addr & ~PAGE_MASK; |
| 356 | npages = PAGE_ALIGN(size + offset) >> PAGE_SHIFT; |
| 357 | vpn_start = (addr & PAGE_MASK) >> PAGE_SHIFT; |
| 358 | vpn_last = vpn_start + npages - 1; |
| 359 | |
| 360 | uiomr = kmalloc(sizeof(*uiomr), GFP_KERNEL); |
| 361 | if (!uiomr) |
| 362 | return ERR_PTR(-ENOMEM); |
| 363 | |
| 364 | uiomr->va = va_base; |
| 365 | uiomr->offset = offset; |
| 366 | uiomr->length = size; |
| 367 | uiomr->writable = writable; |
| 368 | uiomr->pd = pd; |
| 369 | |
| 370 | err = usnic_uiom_get_pages(addr, size, writable, dmasync, |
| 371 | &uiomr->chunk_list); |
| 372 | if (err) { |
| 373 | usnic_err("Failed get_pages vpn [0x%lx,0x%lx] err %d\n", |
| 374 | vpn_start, vpn_last, err); |
| 375 | goto out_free_uiomr; |
| 376 | } |
| 377 | |
| 378 | spin_lock(&pd->lock); |
| 379 | err = usnic_uiom_get_intervals_diff(vpn_start, vpn_last, |
| 380 | (writable) ? IOMMU_WRITE : 0, |
| 381 | IOMMU_WRITE, |
Davidlohr Bueso | f808c13 | 2017-09-08 16:15:08 -0700 | [diff] [blame^] | 382 | &pd->root, |
Upinder Malhi | e3cf00d | 2013-09-10 03:38:16 +0000 | [diff] [blame] | 383 | &sorted_diff_intervals); |
| 384 | if (err) { |
| 385 | usnic_err("Failed disjoint interval vpn [0x%lx,0x%lx] err %d\n", |
| 386 | vpn_start, vpn_last, err); |
| 387 | goto out_put_pages; |
| 388 | } |
| 389 | |
| 390 | err = usnic_uiom_map_sorted_intervals(&sorted_diff_intervals, uiomr); |
| 391 | if (err) { |
| 392 | usnic_err("Failed map interval vpn [0x%lx,0x%lx] err %d\n", |
| 393 | vpn_start, vpn_last, err); |
| 394 | goto out_put_intervals; |
| 395 | |
| 396 | } |
| 397 | |
Davidlohr Bueso | f808c13 | 2017-09-08 16:15:08 -0700 | [diff] [blame^] | 398 | err = usnic_uiom_insert_interval(&pd->root, vpn_start, vpn_last, |
Upinder Malhi | e3cf00d | 2013-09-10 03:38:16 +0000 | [diff] [blame] | 399 | (writable) ? IOMMU_WRITE : 0); |
| 400 | if (err) { |
| 401 | usnic_err("Failed insert interval vpn [0x%lx,0x%lx] err %d\n", |
| 402 | vpn_start, vpn_last, err); |
| 403 | goto out_unmap_intervals; |
| 404 | } |
| 405 | |
| 406 | usnic_uiom_put_interval_set(&sorted_diff_intervals); |
| 407 | spin_unlock(&pd->lock); |
| 408 | |
| 409 | return uiomr; |
| 410 | |
| 411 | out_unmap_intervals: |
| 412 | usnic_uiom_unmap_sorted_intervals(&sorted_diff_intervals, pd); |
| 413 | out_put_intervals: |
| 414 | usnic_uiom_put_interval_set(&sorted_diff_intervals); |
| 415 | out_put_pages: |
| 416 | usnic_uiom_put_pages(&uiomr->chunk_list, 0); |
| 417 | spin_unlock(&pd->lock); |
| 418 | out_free_uiomr: |
| 419 | kfree(uiomr); |
| 420 | return ERR_PTR(err); |
| 421 | } |
| 422 | |
| 423 | void usnic_uiom_reg_release(struct usnic_uiom_reg *uiomr, int closing) |
| 424 | { |
| 425 | struct mm_struct *mm; |
| 426 | unsigned long diff; |
| 427 | |
| 428 | __usnic_uiom_reg_release(uiomr->pd, uiomr, 1); |
| 429 | |
| 430 | mm = get_task_mm(current); |
| 431 | if (!mm) { |
| 432 | kfree(uiomr); |
| 433 | return; |
| 434 | } |
| 435 | |
| 436 | diff = PAGE_ALIGN(uiomr->length + uiomr->offset) >> PAGE_SHIFT; |
| 437 | |
| 438 | /* |
| 439 | * We may be called with the mm's mmap_sem already held. This |
| 440 | * can happen when a userspace munmap() is the call that drops |
| 441 | * the last reference to our file and calls our release |
| 442 | * method. If there are memory regions to destroy, we'll end |
| 443 | * up here and not be able to take the mmap_sem. In that case |
| 444 | * we defer the vm_locked accounting to the system workqueue. |
| 445 | */ |
| 446 | if (closing) { |
| 447 | if (!down_write_trylock(&mm->mmap_sem)) { |
| 448 | INIT_WORK(&uiomr->work, usnic_uiom_reg_account); |
| 449 | uiomr->mm = mm; |
| 450 | uiomr->diff = diff; |
| 451 | |
| 452 | queue_work(usnic_uiom_wq, &uiomr->work); |
| 453 | return; |
| 454 | } |
| 455 | } else |
| 456 | down_write(&mm->mmap_sem); |
| 457 | |
| 458 | current->mm->locked_vm -= diff; |
| 459 | up_write(&mm->mmap_sem); |
| 460 | mmput(mm); |
| 461 | kfree(uiomr); |
| 462 | } |
| 463 | |
| 464 | struct usnic_uiom_pd *usnic_uiom_alloc_pd(void) |
| 465 | { |
| 466 | struct usnic_uiom_pd *pd; |
| 467 | void *domain; |
| 468 | |
| 469 | pd = kzalloc(sizeof(*pd), GFP_KERNEL); |
| 470 | if (!pd) |
| 471 | return ERR_PTR(-ENOMEM); |
| 472 | |
| 473 | pd->domain = domain = iommu_domain_alloc(&pci_bus_type); |
Dan Carpenter | fc3aa45 | 2015-06-04 12:02:18 +0300 | [diff] [blame] | 474 | if (!domain) { |
| 475 | usnic_err("Failed to allocate IOMMU domain"); |
Upinder Malhi | e3cf00d | 2013-09-10 03:38:16 +0000 | [diff] [blame] | 476 | kfree(pd); |
Dan Carpenter | fc3aa45 | 2015-06-04 12:02:18 +0300 | [diff] [blame] | 477 | return ERR_PTR(-ENOMEM); |
Upinder Malhi | e3cf00d | 2013-09-10 03:38:16 +0000 | [diff] [blame] | 478 | } |
| 479 | |
| 480 | iommu_set_fault_handler(pd->domain, usnic_uiom_dma_fault, NULL); |
| 481 | |
| 482 | spin_lock_init(&pd->lock); |
| 483 | INIT_LIST_HEAD(&pd->devs); |
| 484 | |
| 485 | return pd; |
| 486 | } |
| 487 | |
| 488 | void usnic_uiom_dealloc_pd(struct usnic_uiom_pd *pd) |
| 489 | { |
| 490 | iommu_domain_free(pd->domain); |
| 491 | kfree(pd); |
| 492 | } |
| 493 | |
| 494 | int usnic_uiom_attach_dev_to_pd(struct usnic_uiom_pd *pd, struct device *dev) |
| 495 | { |
| 496 | struct usnic_uiom_dev *uiom_dev; |
| 497 | int err; |
| 498 | |
Dan Carpenter | 8ce96af | 2014-01-20 13:32:49 +0300 | [diff] [blame] | 499 | uiom_dev = kzalloc(sizeof(*uiom_dev), GFP_ATOMIC); |
Upinder Malhi | e3cf00d | 2013-09-10 03:38:16 +0000 | [diff] [blame] | 500 | if (!uiom_dev) |
| 501 | return -ENOMEM; |
| 502 | uiom_dev->dev = dev; |
| 503 | |
| 504 | err = iommu_attach_device(pd->domain, dev); |
| 505 | if (err) |
| 506 | goto out_free_dev; |
| 507 | |
Joerg Roedel | 6f95271 | 2014-09-05 12:22:27 +0200 | [diff] [blame] | 508 | if (!iommu_capable(dev->bus, IOMMU_CAP_CACHE_COHERENCY)) { |
Upinder Malhi | e3cf00d | 2013-09-10 03:38:16 +0000 | [diff] [blame] | 509 | usnic_err("IOMMU of %s does not support cache coherency\n", |
| 510 | dev_name(dev)); |
| 511 | err = -EINVAL; |
| 512 | goto out_detach_device; |
| 513 | } |
| 514 | |
| 515 | spin_lock(&pd->lock); |
| 516 | list_add_tail(&uiom_dev->link, &pd->devs); |
| 517 | pd->dev_cnt++; |
| 518 | spin_unlock(&pd->lock); |
| 519 | |
| 520 | return 0; |
| 521 | |
| 522 | out_detach_device: |
| 523 | iommu_detach_device(pd->domain, dev); |
| 524 | out_free_dev: |
| 525 | kfree(uiom_dev); |
| 526 | return err; |
| 527 | } |
| 528 | |
| 529 | void usnic_uiom_detach_dev_from_pd(struct usnic_uiom_pd *pd, struct device *dev) |
| 530 | { |
| 531 | struct usnic_uiom_dev *uiom_dev; |
| 532 | int found = 0; |
| 533 | |
| 534 | spin_lock(&pd->lock); |
| 535 | list_for_each_entry(uiom_dev, &pd->devs, link) { |
| 536 | if (uiom_dev->dev == dev) { |
| 537 | found = 1; |
| 538 | break; |
| 539 | } |
| 540 | } |
| 541 | |
| 542 | if (!found) { |
| 543 | usnic_err("Unable to free dev %s - not found\n", |
| 544 | dev_name(dev)); |
| 545 | spin_unlock(&pd->lock); |
| 546 | return; |
| 547 | } |
| 548 | |
| 549 | list_del(&uiom_dev->link); |
| 550 | pd->dev_cnt--; |
| 551 | spin_unlock(&pd->lock); |
| 552 | |
| 553 | return iommu_detach_device(pd->domain, dev); |
| 554 | } |
| 555 | |
| 556 | struct device **usnic_uiom_get_dev_list(struct usnic_uiom_pd *pd) |
| 557 | { |
| 558 | struct usnic_uiom_dev *uiom_dev; |
| 559 | struct device **devs; |
| 560 | int i = 0; |
| 561 | |
| 562 | spin_lock(&pd->lock); |
| 563 | devs = kcalloc(pd->dev_cnt + 1, sizeof(*devs), GFP_ATOMIC); |
| 564 | if (!devs) { |
| 565 | devs = ERR_PTR(-ENOMEM); |
| 566 | goto out; |
| 567 | } |
| 568 | |
| 569 | list_for_each_entry(uiom_dev, &pd->devs, link) { |
| 570 | devs[i++] = uiom_dev->dev; |
| 571 | } |
| 572 | out: |
| 573 | spin_unlock(&pd->lock); |
| 574 | return devs; |
| 575 | } |
| 576 | |
| 577 | void usnic_uiom_free_dev_list(struct device **devs) |
| 578 | { |
| 579 | kfree(devs); |
| 580 | } |
| 581 | |
| 582 | int usnic_uiom_init(char *drv_name) |
| 583 | { |
| 584 | if (!iommu_present(&pci_bus_type)) { |
| 585 | usnic_err("IOMMU required but not present or enabled. USNIC QPs will not function w/o enabling IOMMU\n"); |
| 586 | return -EPERM; |
| 587 | } |
| 588 | |
| 589 | usnic_uiom_wq = create_workqueue(drv_name); |
| 590 | if (!usnic_uiom_wq) { |
| 591 | usnic_err("Unable to alloc wq for drv %s\n", drv_name); |
| 592 | return -ENOMEM; |
| 593 | } |
| 594 | |
| 595 | return 0; |
| 596 | } |
| 597 | |
| 598 | void usnic_uiom_fini(void) |
| 599 | { |
| 600 | flush_workqueue(usnic_uiom_wq); |
| 601 | destroy_workqueue(usnic_uiom_wq); |
| 602 | } |