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powerpc/mm/4k: don't allocate larger pmd page table for 4k
[linux/fpc-iii.git] / drivers / infiniband / hw / usnic / usnic_uiom.c
blob1ccee6ea5bc3092f196689c4481b21d9f27b796c
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
10 * 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.
33 */
34
35 #include <linux/mm.h>
36 #include <linux/dma-mapping.h>
37 #include <linux/sched.h>
38 #include <linux/hugetlb.h>
39 #include <linux/iommu.h>
40 #include <linux/workqueue.h>
41 #include <linux/list.h>
42 #include <linux/pci.h>
43
44 #include "usnic_log.h"
45 #include "usnic_uiom.h"
46 #include "usnic_uiom_interval_tree.h"
47
48 static struct workqueue_struct *usnic_uiom_wq;
49
50 #define USNIC_UIOM_PAGE_CHUNK \
51 ((PAGE_SIZE - offsetof(struct usnic_uiom_chunk, page_list)) /\
52 ((void *) &((struct usnic_uiom_chunk *) 0)->page_list[1] - \
53 (void *) &((struct usnic_uiom_chunk *) 0)->page_list[0]))
54
55 static void usnic_uiom_reg_account(struct work_struct *work)
56 {
57 struct usnic_uiom_reg *umem = container_of(work,
58 struct usnic_uiom_reg, work);
59
60 down_write(&umem->mm->mmap_sem);
61 umem->mm->locked_vm -= umem->diff;
62 up_write(&umem->mm->mmap_sem);
63 mmput(umem->mm);
64 kfree(umem);
65 }
66
67 static int usnic_uiom_dma_fault(struct iommu_domain *domain,
68 struct device *dev,
69 unsigned long iova, int flags,
70 void *token)
71 {
72 usnic_err("Device %s iommu fault domain 0x%pK va 0x%lx flags 0x%x\n",
73 dev_name(dev),
74 domain, iova, flags);
75 return -ENOSYS;
76 }
77
78 static void usnic_uiom_put_pages(struct list_head *chunk_list, int dirty)
79 {
80 struct usnic_uiom_chunk *chunk, *tmp;
81 struct page *page;
82 struct scatterlist *sg;
83 int i;
84 dma_addr_t pa;
85
86 list_for_each_entry_safe(chunk, tmp, chunk_list, list) {
87 for_each_sg(chunk->page_list, sg, chunk->nents, i) {
88 page = sg_page(sg);
89 pa = sg_phys(sg);
90 if (dirty)
91 set_page_dirty_lock(page);
92 put_page(page);
93 usnic_dbg("pa: %pa\n", &pa);
94 }
95 kfree(chunk);
96 }
97 }
98
99 static int usnic_uiom_get_pages(unsigned long addr, size_t size, int writable,
100 int dmasync, struct list_head *chunk_list)
101 {
102 struct page **page_list;
103 struct scatterlist *sg;
104 struct usnic_uiom_chunk *chunk;
105 unsigned long locked;
106 unsigned long lock_limit;
107 unsigned long cur_base;
108 unsigned long npages;
109 int ret;
110 int off;
111 int i;
112 int flags;
113 dma_addr_t pa;
114 unsigned int gup_flags;
115
116 if (!can_do_mlock())
117 return -EPERM;
118
119 INIT_LIST_HEAD(chunk_list);
120
121 page_list = (struct page **) __get_free_page(GFP_KERNEL);
122 if (!page_list)
123 return -ENOMEM;
124
125 npages = PAGE_ALIGN(size + (addr & ~PAGE_MASK)) >> PAGE_SHIFT;
126
127 down_write(&current->mm->mmap_sem);
128
129 locked = npages + current->mm->locked_vm;
130 lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
131
132 if ((locked > lock_limit) && !capable(CAP_IPC_LOCK)) {
133 ret = -ENOMEM;
134 goto out;
135 }
136
137 flags = IOMMU_READ | IOMMU_CACHE;
138 flags |= (writable) ? IOMMU_WRITE : 0;
139 gup_flags = FOLL_WRITE;
140 gup_flags |= (writable) ? 0 : FOLL_FORCE;
141 cur_base = addr & PAGE_MASK;
142 ret = 0;
143
144 while (npages) {
145 ret = get_user_pages(cur_base,
146 min_t(unsigned long, npages,
147 PAGE_SIZE / sizeof(struct page *)),
148 gup_flags, page_list, NULL);
149
150 if (ret < 0)
151 goto out;
152
153 npages -= ret;
154 off = 0;
155
156 while (ret) {
157 chunk = kmalloc(sizeof(*chunk) +
158 sizeof(struct scatterlist) *
159 min_t(int, ret, USNIC_UIOM_PAGE_CHUNK),
160 GFP_KERNEL);
161 if (!chunk) {
162 ret = -ENOMEM;
163 goto out;
164 }
165
166 chunk->nents = min_t(int, ret, USNIC_UIOM_PAGE_CHUNK);
167 sg_init_table(chunk->page_list, chunk->nents);
168 for_each_sg(chunk->page_list, sg, chunk->nents, i) {
169 sg_set_page(sg, page_list[i + off],
170 PAGE_SIZE, 0);
171 pa = sg_phys(sg);
172 usnic_dbg("va: 0x%lx pa: %pa\n",
173 cur_base + i*PAGE_SIZE, &pa);
174 }
175 cur_base += chunk->nents * PAGE_SIZE;
176 ret -= chunk->nents;
177 off += chunk->nents;
178 list_add_tail(&chunk->list, chunk_list);
179 }
180
181 ret = 0;
182 }
183
184 out:
185 if (ret < 0)
186 usnic_uiom_put_pages(chunk_list, 0);
187 else
188 current->mm->locked_vm = locked;
189
190 up_write(&current->mm->mmap_sem);
191 free_page((unsigned long) page_list);
192 return ret;
193 }
194
195 static void usnic_uiom_unmap_sorted_intervals(struct list_head *intervals,
196 struct usnic_uiom_pd *pd)
197 {
198 struct usnic_uiom_interval_node *interval, *tmp;
199 long unsigned va, size;
200
201 list_for_each_entry_safe(interval, tmp, intervals, link) {
202 va = interval->start << PAGE_SHIFT;
203 size = ((interval->last - interval->start) + 1) << PAGE_SHIFT;
204 while (size > 0) {
205 /* Workaround for RH 970401 */
206 usnic_dbg("va 0x%lx size 0x%lx", va, PAGE_SIZE);
207 iommu_unmap(pd->domain, va, PAGE_SIZE);
208 va += PAGE_SIZE;
209 size -= PAGE_SIZE;
210 }
211 }
212 }
213
214 static void __usnic_uiom_reg_release(struct usnic_uiom_pd *pd,
215 struct usnic_uiom_reg *uiomr,
216 int dirty)
217 {
218 int npages;
219 unsigned long vpn_start, vpn_last;
220 struct usnic_uiom_interval_node *interval, *tmp;
221 int writable = 0;
222 LIST_HEAD(rm_intervals);
223
224 npages = PAGE_ALIGN(uiomr->length + uiomr->offset) >> PAGE_SHIFT;
225 vpn_start = (uiomr->va & PAGE_MASK) >> PAGE_SHIFT;
226 vpn_last = vpn_start + npages - 1;
227
228 spin_lock(&pd->lock);
229 usnic_uiom_remove_interval(&pd->rb_root, vpn_start,
230 vpn_last, &rm_intervals);
231 usnic_uiom_unmap_sorted_intervals(&rm_intervals, pd);
232
233 list_for_each_entry_safe(interval, tmp, &rm_intervals, link) {
234 if (interval->flags & IOMMU_WRITE)
235 writable = 1;
236 list_del(&interval->link);
237 kfree(interval);
238 }
239
240 usnic_uiom_put_pages(&uiomr->chunk_list, dirty & writable);
241 spin_unlock(&pd->lock);
242 }
243
244 static int usnic_uiom_map_sorted_intervals(struct list_head *intervals,
245 struct usnic_uiom_reg *uiomr)
246 {
247 int i, err;
248 size_t size;
249 struct usnic_uiom_chunk *chunk;
250 struct usnic_uiom_interval_node *interval_node;
251 dma_addr_t pa;
252 dma_addr_t pa_start = 0;
253 dma_addr_t pa_end = 0;
254 long int va_start = -EINVAL;
255 struct usnic_uiom_pd *pd = uiomr->pd;
256 long int va = uiomr->va & PAGE_MASK;
257 int flags = IOMMU_READ | IOMMU_CACHE;
258
259 flags |= (uiomr->writable) ? IOMMU_WRITE : 0;
260 chunk = list_first_entry(&uiomr->chunk_list, struct usnic_uiom_chunk,
261 list);
262 list_for_each_entry(interval_node, intervals, link) {
263 iter_chunk:
264 for (i = 0; i < chunk->nents; i++, va += PAGE_SIZE) {
265 pa = sg_phys(&chunk->page_list[i]);
266 if ((va >> PAGE_SHIFT) < interval_node->start)
267 continue;
268
269 if ((va >> PAGE_SHIFT) == interval_node->start) {
270 /* First page of the interval */
271 va_start = va;
272 pa_start = pa;
273 pa_end = pa;
274 }
275
276 WARN_ON(va_start == -EINVAL);
277
278 if ((pa_end + PAGE_SIZE != pa) &&
279 (pa != pa_start)) {
280 /* PAs are not contiguous */
281 size = pa_end - pa_start + PAGE_SIZE;
282 usnic_dbg("va 0x%lx pa %pa size 0x%zx flags 0x%x",
283 va_start, &pa_start, size, flags);
284 err = iommu_map(pd->domain, va_start, pa_start,
285 size, flags);
286 if (err) {
287 usnic_err("Failed to map va 0x%lx pa %pa size 0x%zx with err %d\n",
288 va_start, &pa_start, size, err);
289 goto err_out;
290 }
291 va_start = va;
292 pa_start = pa;
293 pa_end = pa;
294 }
295
296 if ((va >> PAGE_SHIFT) == interval_node->last) {
297 /* Last page of the interval */
298 size = pa - pa_start + PAGE_SIZE;
299 usnic_dbg("va 0x%lx pa %pa size 0x%zx flags 0x%x\n",
300 va_start, &pa_start, size, flags);
301 err = iommu_map(pd->domain, va_start, pa_start,
302 size, flags);
303 if (err) {
304 usnic_err("Failed to map va 0x%lx pa %pa size 0x%zx with err %d\n",
305 va_start, &pa_start, size, err);
306 goto err_out;
307 }
308 break;
309 }
310
311 if (pa != pa_start)
312 pa_end += PAGE_SIZE;
313 }
314
315 if (i == chunk->nents) {
316 /*
317 * Hit last entry of the chunk,
318 * hence advance to next chunk
319 */
320 chunk = list_first_entry(&chunk->list,
321 struct usnic_uiom_chunk,
322 list);
323 goto iter_chunk;
324 }
325 }
326
327 return 0;
328
329 err_out:
330 usnic_uiom_unmap_sorted_intervals(intervals, pd);
331 return err;
332 }
333
334 struct usnic_uiom_reg *usnic_uiom_reg_get(struct usnic_uiom_pd *pd,
335 unsigned long addr, size_t size,
336 int writable, int dmasync)
337 {
338 struct usnic_uiom_reg *uiomr;
339 unsigned long va_base, vpn_start, vpn_last;
340 unsigned long npages;
341 int offset, err;
342 LIST_HEAD(sorted_diff_intervals);
343
344 /*
345 * Intel IOMMU map throws an error if a translation entry is
346 * changed from read to write. This module may not unmap
347 * and then remap the entry after fixing the permission
348 * b/c this open up a small windows where hw DMA may page fault
349 * Hence, make all entries to be writable.
350 */
351 writable = 1;
352
353 va_base = addr & PAGE_MASK;
354 offset = addr & ~PAGE_MASK;
355 npages = PAGE_ALIGN(size + offset) >> PAGE_SHIFT;
356 vpn_start = (addr & PAGE_MASK) >> PAGE_SHIFT;
357 vpn_last = vpn_start + npages - 1;
358
359 uiomr = kmalloc(sizeof(*uiomr), GFP_KERNEL);
360 if (!uiomr)
361 return ERR_PTR(-ENOMEM);
362
363 uiomr->va = va_base;
364 uiomr->offset = offset;
365 uiomr->length = size;
366 uiomr->writable = writable;
367 uiomr->pd = pd;
368
369 err = usnic_uiom_get_pages(addr, size, writable, dmasync,
370 &uiomr->chunk_list);
371 if (err) {
372 usnic_err("Failed get_pages vpn [0x%lx,0x%lx] err %d\n",
373 vpn_start, vpn_last, err);
374 goto out_free_uiomr;
375 }
376
377 spin_lock(&pd->lock);
378 err = usnic_uiom_get_intervals_diff(vpn_start, vpn_last,
379 (writable) ? IOMMU_WRITE : 0,
380 IOMMU_WRITE,
381 &pd->rb_root,
382 &sorted_diff_intervals);
383 if (err) {
384 usnic_err("Failed disjoint interval vpn [0x%lx,0x%lx] err %d\n",
385 vpn_start, vpn_last, err);
386 goto out_put_pages;
387 }
388
389 err = usnic_uiom_map_sorted_intervals(&sorted_diff_intervals, uiomr);
390 if (err) {
391 usnic_err("Failed map interval vpn [0x%lx,0x%lx] err %d\n",
392 vpn_start, vpn_last, err);
393 goto out_put_intervals;
394
395 }
396
397 err = usnic_uiom_insert_interval(&pd->rb_root, vpn_start, vpn_last,
398 (writable) ? IOMMU_WRITE : 0);
399 if (err) {
400 usnic_err("Failed insert interval vpn [0x%lx,0x%lx] err %d\n",
401 vpn_start, vpn_last, err);
402 goto out_unmap_intervals;
403 }
404
405 usnic_uiom_put_interval_set(&sorted_diff_intervals);
406 spin_unlock(&pd->lock);
407
408 return uiomr;
409
410 out_unmap_intervals:
411 usnic_uiom_unmap_sorted_intervals(&sorted_diff_intervals, pd);
412 out_put_intervals:
413 usnic_uiom_put_interval_set(&sorted_diff_intervals);
414 out_put_pages:
415 usnic_uiom_put_pages(&uiomr->chunk_list, 0);
416 spin_unlock(&pd->lock);
417 out_free_uiomr:
418 kfree(uiomr);
419 return ERR_PTR(err);
420 }
421
422 void usnic_uiom_reg_release(struct usnic_uiom_reg *uiomr, int closing)
423 {
424 struct mm_struct *mm;
425 unsigned long diff;
426
427 __usnic_uiom_reg_release(uiomr->pd, uiomr, 1);
428
429 mm = get_task_mm(current);
430 if (!mm) {
431 kfree(uiomr);
432 return;
433 }
434
435 diff = PAGE_ALIGN(uiomr->length + uiomr->offset) >> PAGE_SHIFT;
436
437 /*
438 * We may be called with the mm's mmap_sem already held. This
439 * can happen when a userspace munmap() is the call that drops
440 * the last reference to our file and calls our release
441 * method. If there are memory regions to destroy, we'll end
442 * up here and not be able to take the mmap_sem. In that case
443 * we defer the vm_locked accounting to the system workqueue.
444 */
445 if (closing) {
446 if (!down_write_trylock(&mm->mmap_sem)) {
447 INIT_WORK(&uiomr->work, usnic_uiom_reg_account);
448 uiomr->mm = mm;
449 uiomr->diff = diff;
450
451 queue_work(usnic_uiom_wq, &uiomr->work);
452 return;
453 }
454 } else
455 down_write(&mm->mmap_sem);
456
457 current->mm->locked_vm -= diff;
458 up_write(&mm->mmap_sem);
459 mmput(mm);
460 kfree(uiomr);
461 }
462
463 struct usnic_uiom_pd *usnic_uiom_alloc_pd(void)
464 {
465 struct usnic_uiom_pd *pd;
466 void *domain;
467
468 pd = kzalloc(sizeof(*pd), GFP_KERNEL);
469 if (!pd)
470 return ERR_PTR(-ENOMEM);
471
472 pd->domain = domain = iommu_domain_alloc(&pci_bus_type);
473 if (!domain) {
474 usnic_err("Failed to allocate IOMMU domain");
475 kfree(pd);
476 return ERR_PTR(-ENOMEM);
477 }
478
479 iommu_set_fault_handler(pd->domain, usnic_uiom_dma_fault, NULL);
480
481 spin_lock_init(&pd->lock);
482 INIT_LIST_HEAD(&pd->devs);
483
484 return pd;
485 }
486
487 void usnic_uiom_dealloc_pd(struct usnic_uiom_pd *pd)
488 {
489 iommu_domain_free(pd->domain);
490 kfree(pd);
491 }
492
493 int usnic_uiom_attach_dev_to_pd(struct usnic_uiom_pd *pd, struct device *dev)
494 {
495 struct usnic_uiom_dev *uiom_dev;
496 int err;
497
498 uiom_dev = kzalloc(sizeof(*uiom_dev), GFP_ATOMIC);
499 if (!uiom_dev)
500 return -ENOMEM;
501 uiom_dev->dev = dev;
502
503 err = iommu_attach_device(pd->domain, dev);
504 if (err)
505 goto out_free_dev;
506
507 if (!iommu_capable(dev->bus, IOMMU_CAP_CACHE_COHERENCY)) {
508 usnic_err("IOMMU of %s does not support cache coherency\n",
509 dev_name(dev));
510 err = -EINVAL;
511 goto out_detach_device;
512 }
513
514 spin_lock(&pd->lock);
515 list_add_tail(&uiom_dev->link, &pd->devs);
516 pd->dev_cnt++;
517 spin_unlock(&pd->lock);
518
519 return 0;
520
521 out_detach_device:
522 iommu_detach_device(pd->domain, dev);
523 out_free_dev:
524 kfree(uiom_dev);
525 return err;
526 }
527
528 void usnic_uiom_detach_dev_from_pd(struct usnic_uiom_pd *pd, struct device *dev)
529 {
530 struct usnic_uiom_dev *uiom_dev;
531 int found = 0;
532
533 spin_lock(&pd->lock);
534 list_for_each_entry(uiom_dev, &pd->devs, link) {
535 if (uiom_dev->dev == dev) {
536 found = 1;
537 break;
538 }
539 }
540
541 if (!found) {
542 usnic_err("Unable to free dev %s - not found\n",
543 dev_name(dev));
544 spin_unlock(&pd->lock);
545 return;
546 }
547
548 list_del(&uiom_dev->link);
549 pd->dev_cnt--;
550 spin_unlock(&pd->lock);
551
552 return iommu_detach_device(pd->domain, dev);
553 }
554
555 struct device **usnic_uiom_get_dev_list(struct usnic_uiom_pd *pd)
556 {
557 struct usnic_uiom_dev *uiom_dev;
558 struct device **devs;
559 int i = 0;
560
561 spin_lock(&pd->lock);
562 devs = kcalloc(pd->dev_cnt + 1, sizeof(*devs), GFP_ATOMIC);
563 if (!devs) {
564 devs = ERR_PTR(-ENOMEM);
565 goto out;
566 }
567
568 list_for_each_entry(uiom_dev, &pd->devs, link) {
569 devs[i++] = uiom_dev->dev;
570 }
571 out:
572 spin_unlock(&pd->lock);
573 return devs;
574 }
575
576 void usnic_uiom_free_dev_list(struct device **devs)
577 {
578 kfree(devs);
579 }
580
581 int usnic_uiom_init(char *drv_name)
582 {
583 if (!iommu_present(&pci_bus_type)) {
584 usnic_err("IOMMU required but not present or enabled. USNIC QPs will not function w/o enabling IOMMU\n");
585 return -EPERM;
586 }
587
588 usnic_uiom_wq = create_workqueue(drv_name);
589 if (!usnic_uiom_wq) {
590 usnic_err("Unable to alloc wq for drv %s\n", drv_name);
591 return -ENOMEM;
592 }
593
594 return 0;
595 }
596
597 void usnic_uiom_fini(void)
598 {
599 flush_workqueue(usnic_uiom_wq);
600 destroy_workqueue(usnic_uiom_wq);
601 }
Linux with added FPC-III support