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Detach sched.h from mm.h
[deliverable/linux.git] / drivers / infiniband / hw / mthca / mthca_memfree.c
1 /*
2 * Copyright (c) 2004, 2005 Topspin Communications. All rights reserved.
3 * Copyright (c) 2005 Cisco Systems. All rights reserved.
4 * Copyright (c) 2005 Mellanox Technologies. 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 * 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.
33 *
34 * $Id$
35 */
36
37 #include <linux/mm.h>
38 #include <linux/scatterlist.h>
39 #include <linux/sched.h>
40
41 #include <asm/page.h>
42
43 #include "mthca_memfree.h"
44 #include "mthca_dev.h"
45 #include "mthca_cmd.h"
46
47 /*
48 * We allocate in as big chunks as we can, up to a maximum of 256 KB
49 * per chunk.
50 */
51 enum {
52 MTHCA_ICM_ALLOC_SIZE = 1 << 18,
53 MTHCA_TABLE_CHUNK_SIZE = 1 << 18
54 };
55
56 struct mthca_user_db_table {
57 struct mutex mutex;
58 struct {
59 u64 uvirt;
60 struct scatterlist mem;
61 int refcount;
62 } page[0];
63 };
64
65 static void mthca_free_icm_pages(struct mthca_dev *dev, struct mthca_icm_chunk *chunk)
66 {
67 int i;
68
69 if (chunk->nsg > 0)
70 pci_unmap_sg(dev->pdev, chunk->mem, chunk->npages,
71 PCI_DMA_BIDIRECTIONAL);
72
73 for (i = 0; i < chunk->npages; ++i)
74 __free_pages(chunk->mem[i].page,
75 get_order(chunk->mem[i].length));
76 }
77
78 static void mthca_free_icm_coherent(struct mthca_dev *dev, struct mthca_icm_chunk *chunk)
79 {
80 int i;
81
82 for (i = 0; i < chunk->npages; ++i) {
83 dma_free_coherent(&dev->pdev->dev, chunk->mem[i].length,
84 lowmem_page_address(chunk->mem[i].page),
85 sg_dma_address(&chunk->mem[i]));
86 }
87 }
88
89 void mthca_free_icm(struct mthca_dev *dev, struct mthca_icm *icm, int coherent)
90 {
91 struct mthca_icm_chunk *chunk, *tmp;
92
93 if (!icm)
94 return;
95
96 list_for_each_entry_safe(chunk, tmp, &icm->chunk_list, list) {
97 if (coherent)
98 mthca_free_icm_coherent(dev, chunk);
99 else
100 mthca_free_icm_pages(dev, chunk);
101
102 kfree(chunk);
103 }
104
105 kfree(icm);
106 }
107
108 static int mthca_alloc_icm_pages(struct scatterlist *mem, int order, gfp_t gfp_mask)
109 {
110 mem->page = alloc_pages(gfp_mask, order);
111 if (!mem->page)
112 return -ENOMEM;
113
114 mem->length = PAGE_SIZE << order;
115 mem->offset = 0;
116 return 0;
117 }
118
119 static int mthca_alloc_icm_coherent(struct device *dev, struct scatterlist *mem,
120 int order, gfp_t gfp_mask)
121 {
122 void *buf = dma_alloc_coherent(dev, PAGE_SIZE << order, &sg_dma_address(mem),
123 gfp_mask);
124 if (!buf)
125 return -ENOMEM;
126
127 sg_set_buf(mem, buf, PAGE_SIZE << order);
128 BUG_ON(mem->offset);
129 sg_dma_len(mem) = PAGE_SIZE << order;
130 return 0;
131 }
132
133 struct mthca_icm *mthca_alloc_icm(struct mthca_dev *dev, int npages,
134 gfp_t gfp_mask, int coherent)
135 {
136 struct mthca_icm *icm;
137 struct mthca_icm_chunk *chunk = NULL;
138 int cur_order;
139 int ret;
140
141 /* We use sg_set_buf for coherent allocs, which assumes low memory */
142 BUG_ON(coherent && (gfp_mask & __GFP_HIGHMEM));
143
144 icm = kmalloc(sizeof *icm, gfp_mask & ~(__GFP_HIGHMEM | __GFP_NOWARN));
145 if (!icm)
146 return icm;
147
148 icm->refcount = 0;
149 INIT_LIST_HEAD(&icm->chunk_list);
150
151 cur_order = get_order(MTHCA_ICM_ALLOC_SIZE);
152
153 while (npages > 0) {
154 if (!chunk) {
155 chunk = kmalloc(sizeof *chunk,
156 gfp_mask & ~(__GFP_HIGHMEM | __GFP_NOWARN));
157 if (!chunk)
158 goto fail;
159
160 chunk->npages = 0;
161 chunk->nsg = 0;
162 list_add_tail(&chunk->list, &icm->chunk_list);
163 }
164
165 while (1 << cur_order > npages)
166 --cur_order;
167
168 if (coherent)
169 ret = mthca_alloc_icm_coherent(&dev->pdev->dev,
170 &chunk->mem[chunk->npages],
171 cur_order, gfp_mask);
172 else
173 ret = mthca_alloc_icm_pages(&chunk->mem[chunk->npages],
174 cur_order, gfp_mask);
175
176 if (!ret) {
177 ++chunk->npages;
178
179 if (coherent)
180 ++chunk->nsg;
181 else if (chunk->npages == MTHCA_ICM_CHUNK_LEN) {
182 chunk->nsg = pci_map_sg(dev->pdev, chunk->mem,
183 chunk->npages,
184 PCI_DMA_BIDIRECTIONAL);
185
186 if (chunk->nsg <= 0)
187 goto fail;
188 }
189
190 if (chunk->npages == MTHCA_ICM_CHUNK_LEN)
191 chunk = NULL;
192
193 npages -= 1 << cur_order;
194 } else {
195 --cur_order;
196 if (cur_order < 0)
197 goto fail;
198 }
199 }
200
201 if (!coherent && chunk) {
202 chunk->nsg = pci_map_sg(dev->pdev, chunk->mem,
203 chunk->npages,
204 PCI_DMA_BIDIRECTIONAL);
205
206 if (chunk->nsg <= 0)
207 goto fail;
208 }
209
210 return icm;
211
212 fail:
213 mthca_free_icm(dev, icm, coherent);
214 return NULL;
215 }
216
217 int mthca_table_get(struct mthca_dev *dev, struct mthca_icm_table *table, int obj)
218 {
219 int i = (obj & (table->num_obj - 1)) * table->obj_size / MTHCA_TABLE_CHUNK_SIZE;
220 int ret = 0;
221 u8 status;
222
223 mutex_lock(&table->mutex);
224
225 if (table->icm[i]) {
226 ++table->icm[i]->refcount;
227 goto out;
228 }
229
230 table->icm[i] = mthca_alloc_icm(dev, MTHCA_TABLE_CHUNK_SIZE >> PAGE_SHIFT,
231 (table->lowmem ? GFP_KERNEL : GFP_HIGHUSER) |
232 __GFP_NOWARN, table->coherent);
233 if (!table->icm[i]) {
234 ret = -ENOMEM;
235 goto out;
236 }
237
238 if (mthca_MAP_ICM(dev, table->icm[i], table->virt + i * MTHCA_TABLE_CHUNK_SIZE,
239 &status) || status) {
240 mthca_free_icm(dev, table->icm[i], table->coherent);
241 table->icm[i] = NULL;
242 ret = -ENOMEM;
243 goto out;
244 }
245
246 ++table->icm[i]->refcount;
247
248 out:
249 mutex_unlock(&table->mutex);
250 return ret;
251 }
252
253 void mthca_table_put(struct mthca_dev *dev, struct mthca_icm_table *table, int obj)
254 {
255 int i;
256 u8 status;
257
258 if (!mthca_is_memfree(dev))
259 return;
260
261 i = (obj & (table->num_obj - 1)) * table->obj_size / MTHCA_TABLE_CHUNK_SIZE;
262
263 mutex_lock(&table->mutex);
264
265 if (--table->icm[i]->refcount == 0) {
266 mthca_UNMAP_ICM(dev, table->virt + i * MTHCA_TABLE_CHUNK_SIZE,
267 MTHCA_TABLE_CHUNK_SIZE / MTHCA_ICM_PAGE_SIZE,
268 &status);
269 mthca_free_icm(dev, table->icm[i], table->coherent);
270 table->icm[i] = NULL;
271 }
272
273 mutex_unlock(&table->mutex);
274 }
275
276 void *mthca_table_find(struct mthca_icm_table *table, int obj, dma_addr_t *dma_handle)
277 {
278 int idx, offset, dma_offset, i;
279 struct mthca_icm_chunk *chunk;
280 struct mthca_icm *icm;
281 struct page *page = NULL;
282
283 if (!table->lowmem)
284 return NULL;
285
286 mutex_lock(&table->mutex);
287
288 idx = (obj & (table->num_obj - 1)) * table->obj_size;
289 icm = table->icm[idx / MTHCA_TABLE_CHUNK_SIZE];
290 dma_offset = offset = idx % MTHCA_TABLE_CHUNK_SIZE;
291
292 if (!icm)
293 goto out;
294
295 list_for_each_entry(chunk, &icm->chunk_list, list) {
296 for (i = 0; i < chunk->npages; ++i) {
297 if (dma_handle && dma_offset >= 0) {
298 if (sg_dma_len(&chunk->mem[i]) > dma_offset)
299 *dma_handle = sg_dma_address(&chunk->mem[i]) +
300 dma_offset;
301 dma_offset -= sg_dma_len(&chunk->mem[i]);
302 }
303 /* DMA mapping can merge pages but not split them,
304 * so if we found the page, dma_handle has already
305 * been assigned to. */
306 if (chunk->mem[i].length > offset) {
307 page = chunk->mem[i].page;
308 goto out;
309 }
310 offset -= chunk->mem[i].length;
311 }
312 }
313
314 out:
315 mutex_unlock(&table->mutex);
316 return page ? lowmem_page_address(page) + offset : NULL;
317 }
318
319 int mthca_table_get_range(struct mthca_dev *dev, struct mthca_icm_table *table,
320 int start, int end)
321 {
322 int inc = MTHCA_TABLE_CHUNK_SIZE / table->obj_size;
323 int i, err;
324
325 for (i = start; i <= end; i += inc) {
326 err = mthca_table_get(dev, table, i);
327 if (err)
328 goto fail;
329 }
330
331 return 0;
332
333 fail:
334 while (i > start) {
335 i -= inc;
336 mthca_table_put(dev, table, i);
337 }
338
339 return err;
340 }
341
342 void mthca_table_put_range(struct mthca_dev *dev, struct mthca_icm_table *table,
343 int start, int end)
344 {
345 int i;
346
347 if (!mthca_is_memfree(dev))
348 return;
349
350 for (i = start; i <= end; i += MTHCA_TABLE_CHUNK_SIZE / table->obj_size)
351 mthca_table_put(dev, table, i);
352 }
353
354 struct mthca_icm_table *mthca_alloc_icm_table(struct mthca_dev *dev,
355 u64 virt, int obj_size,
356 int nobj, int reserved,
357 int use_lowmem, int use_coherent)
358 {
359 struct mthca_icm_table *table;
360 int num_icm;
361 unsigned chunk_size;
362 int i;
363 u8 status;
364
365 num_icm = (obj_size * nobj + MTHCA_TABLE_CHUNK_SIZE - 1) / MTHCA_TABLE_CHUNK_SIZE;
366
367 table = kmalloc(sizeof *table + num_icm * sizeof *table->icm, GFP_KERNEL);
368 if (!table)
369 return NULL;
370
371 table->virt = virt;
372 table->num_icm = num_icm;
373 table->num_obj = nobj;
374 table->obj_size = obj_size;
375 table->lowmem = use_lowmem;
376 table->coherent = use_coherent;
377 mutex_init(&table->mutex);
378
379 for (i = 0; i < num_icm; ++i)
380 table->icm[i] = NULL;
381
382 for (i = 0; i * MTHCA_TABLE_CHUNK_SIZE < reserved * obj_size; ++i) {
383 chunk_size = MTHCA_TABLE_CHUNK_SIZE;
384 if ((i + 1) * MTHCA_TABLE_CHUNK_SIZE > nobj * obj_size)
385 chunk_size = nobj * obj_size - i * MTHCA_TABLE_CHUNK_SIZE;
386
387 table->icm[i] = mthca_alloc_icm(dev, chunk_size >> PAGE_SHIFT,
388 (use_lowmem ? GFP_KERNEL : GFP_HIGHUSER) |
389 __GFP_NOWARN, use_coherent);
390 if (!table->icm[i])
391 goto err;
392 if (mthca_MAP_ICM(dev, table->icm[i], virt + i * MTHCA_TABLE_CHUNK_SIZE,
393 &status) || status) {
394 mthca_free_icm(dev, table->icm[i], table->coherent);
395 table->icm[i] = NULL;
396 goto err;
397 }
398
399 /*
400 * Add a reference to this ICM chunk so that it never
401 * gets freed (since it contains reserved firmware objects).
402 */
403 ++table->icm[i]->refcount;
404 }
405
406 return table;
407
408 err:
409 for (i = 0; i < num_icm; ++i)
410 if (table->icm[i]) {
411 mthca_UNMAP_ICM(dev, virt + i * MTHCA_TABLE_CHUNK_SIZE,
412 MTHCA_TABLE_CHUNK_SIZE / MTHCA_ICM_PAGE_SIZE,
413 &status);
414 mthca_free_icm(dev, table->icm[i], table->coherent);
415 }
416
417 kfree(table);
418
419 return NULL;
420 }
421
422 void mthca_free_icm_table(struct mthca_dev *dev, struct mthca_icm_table *table)
423 {
424 int i;
425 u8 status;
426
427 for (i = 0; i < table->num_icm; ++i)
428 if (table->icm[i]) {
429 mthca_UNMAP_ICM(dev, table->virt + i * MTHCA_TABLE_CHUNK_SIZE,
430 MTHCA_TABLE_CHUNK_SIZE / MTHCA_ICM_PAGE_SIZE,
431 &status);
432 mthca_free_icm(dev, table->icm[i], table->coherent);
433 }
434
435 kfree(table);
436 }
437
438 static u64 mthca_uarc_virt(struct mthca_dev *dev, struct mthca_uar *uar, int page)
439 {
440 return dev->uar_table.uarc_base +
441 uar->index * dev->uar_table.uarc_size +
442 page * MTHCA_ICM_PAGE_SIZE;
443 }
444
445 int mthca_map_user_db(struct mthca_dev *dev, struct mthca_uar *uar,
446 struct mthca_user_db_table *db_tab, int index, u64 uaddr)
447 {
448 int ret = 0;
449 u8 status;
450 int i;
451
452 if (!mthca_is_memfree(dev))
453 return 0;
454
455 if (index < 0 || index > dev->uar_table.uarc_size / 8)
456 return -EINVAL;
457
458 mutex_lock(&db_tab->mutex);
459
460 i = index / MTHCA_DB_REC_PER_PAGE;
461
462 if ((db_tab->page[i].refcount >= MTHCA_DB_REC_PER_PAGE) ||
463 (db_tab->page[i].uvirt && db_tab->page[i].uvirt != uaddr) ||
464 (uaddr & 4095)) {
465 ret = -EINVAL;
466 goto out;
467 }
468
469 if (db_tab->page[i].refcount) {
470 ++db_tab->page[i].refcount;
471 goto out;
472 }
473
474 ret = get_user_pages(current, current->mm, uaddr & PAGE_MASK, 1, 1, 0,
475 &db_tab->page[i].mem.page, NULL);
476 if (ret < 0)
477 goto out;
478
479 db_tab->page[i].mem.length = MTHCA_ICM_PAGE_SIZE;
480 db_tab->page[i].mem.offset = uaddr & ~PAGE_MASK;
481
482 ret = pci_map_sg(dev->pdev, &db_tab->page[i].mem, 1, PCI_DMA_TODEVICE);
483 if (ret < 0) {
484 put_page(db_tab->page[i].mem.page);
485 goto out;
486 }
487
488 ret = mthca_MAP_ICM_page(dev, sg_dma_address(&db_tab->page[i].mem),
489 mthca_uarc_virt(dev, uar, i), &status);
490 if (!ret && status)
491 ret = -EINVAL;
492 if (ret) {
493 pci_unmap_sg(dev->pdev, &db_tab->page[i].mem, 1, PCI_DMA_TODEVICE);
494 put_page(db_tab->page[i].mem.page);
495 goto out;
496 }
497
498 db_tab->page[i].uvirt = uaddr;
499 db_tab->page[i].refcount = 1;
500
501 out:
502 mutex_unlock(&db_tab->mutex);
503 return ret;
504 }
505
506 void mthca_unmap_user_db(struct mthca_dev *dev, struct mthca_uar *uar,
507 struct mthca_user_db_table *db_tab, int index)
508 {
509 if (!mthca_is_memfree(dev))
510 return;
511
512 /*
513 * To make our bookkeeping simpler, we don't unmap DB
514 * pages until we clean up the whole db table.
515 */
516
517 mutex_lock(&db_tab->mutex);
518
519 --db_tab->page[index / MTHCA_DB_REC_PER_PAGE].refcount;
520
521 mutex_unlock(&db_tab->mutex);
522 }
523
524 struct mthca_user_db_table *mthca_init_user_db_tab(struct mthca_dev *dev)
525 {
526 struct mthca_user_db_table *db_tab;
527 int npages;
528 int i;
529
530 if (!mthca_is_memfree(dev))
531 return NULL;
532
533 npages = dev->uar_table.uarc_size / MTHCA_ICM_PAGE_SIZE;
534 db_tab = kmalloc(sizeof *db_tab + npages * sizeof *db_tab->page, GFP_KERNEL);
535 if (!db_tab)
536 return ERR_PTR(-ENOMEM);
537
538 mutex_init(&db_tab->mutex);
539 for (i = 0; i < npages; ++i) {
540 db_tab->page[i].refcount = 0;
541 db_tab->page[i].uvirt = 0;
542 }
543
544 return db_tab;
545 }
546
547 void mthca_cleanup_user_db_tab(struct mthca_dev *dev, struct mthca_uar *uar,
548 struct mthca_user_db_table *db_tab)
549 {
550 int i;
551 u8 status;
552
553 if (!mthca_is_memfree(dev))
554 return;
555
556 for (i = 0; i < dev->uar_table.uarc_size / MTHCA_ICM_PAGE_SIZE; ++i) {
557 if (db_tab->page[i].uvirt) {
558 mthca_UNMAP_ICM(dev, mthca_uarc_virt(dev, uar, i), 1, &status);
559 pci_unmap_sg(dev->pdev, &db_tab->page[i].mem, 1, PCI_DMA_TODEVICE);
560 put_page(db_tab->page[i].mem.page);
561 }
562 }
563
564 kfree(db_tab);
565 }
566
567 int mthca_alloc_db(struct mthca_dev *dev, enum mthca_db_type type,
568 u32 qn, __be32 **db)
569 {
570 int group;
571 int start, end, dir;
572 int i, j;
573 struct mthca_db_page *page;
574 int ret = 0;
575 u8 status;
576
577 mutex_lock(&dev->db_tab->mutex);
578
579 switch (type) {
580 case MTHCA_DB_TYPE_CQ_ARM:
581 case MTHCA_DB_TYPE_SQ:
582 group = 0;
583 start = 0;
584 end = dev->db_tab->max_group1;
585 dir = 1;
586 break;
587
588 case MTHCA_DB_TYPE_CQ_SET_CI:
589 case MTHCA_DB_TYPE_RQ:
590 case MTHCA_DB_TYPE_SRQ:
591 group = 1;
592 start = dev->db_tab->npages - 1;
593 end = dev->db_tab->min_group2;
594 dir = -1;
595 break;
596
597 default:
598 ret = -EINVAL;
599 goto out;
600 }
601
602 for (i = start; i != end; i += dir)
603 if (dev->db_tab->page[i].db_rec &&
604 !bitmap_full(dev->db_tab->page[i].used,
605 MTHCA_DB_REC_PER_PAGE)) {
606 page = dev->db_tab->page + i;
607 goto found;
608 }
609
610 for (i = start; i != end; i += dir)
611 if (!dev->db_tab->page[i].db_rec) {
612 page = dev->db_tab->page + i;
613 goto alloc;
614 }
615
616 if (dev->db_tab->max_group1 >= dev->db_tab->min_group2 - 1) {
617 ret = -ENOMEM;
618 goto out;
619 }
620
621 if (group == 0)
622 ++dev->db_tab->max_group1;
623 else
624 --dev->db_tab->min_group2;
625
626 page = dev->db_tab->page + end;
627
628 alloc:
629 page->db_rec = dma_alloc_coherent(&dev->pdev->dev, MTHCA_ICM_PAGE_SIZE,
630 &page->mapping, GFP_KERNEL);
631 if (!page->db_rec) {
632 ret = -ENOMEM;
633 goto out;
634 }
635 memset(page->db_rec, 0, MTHCA_ICM_PAGE_SIZE);
636
637 ret = mthca_MAP_ICM_page(dev, page->mapping,
638 mthca_uarc_virt(dev, &dev->driver_uar, i), &status);
639 if (!ret && status)
640 ret = -EINVAL;
641 if (ret) {
642 dma_free_coherent(&dev->pdev->dev, MTHCA_ICM_PAGE_SIZE,
643 page->db_rec, page->mapping);
644 goto out;
645 }
646
647 bitmap_zero(page->used, MTHCA_DB_REC_PER_PAGE);
648
649 found:
650 j = find_first_zero_bit(page->used, MTHCA_DB_REC_PER_PAGE);
651 set_bit(j, page->used);
652
653 if (group == 1)
654 j = MTHCA_DB_REC_PER_PAGE - 1 - j;
655
656 ret = i * MTHCA_DB_REC_PER_PAGE + j;
657
658 page->db_rec[j] = cpu_to_be64((qn << 8) | (type << 5));
659
660 *db = (__be32 *) &page->db_rec[j];
661
662 out:
663 mutex_unlock(&dev->db_tab->mutex);
664
665 return ret;
666 }
667
668 void mthca_free_db(struct mthca_dev *dev, int type, int db_index)
669 {
670 int i, j;
671 struct mthca_db_page *page;
672 u8 status;
673
674 i = db_index / MTHCA_DB_REC_PER_PAGE;
675 j = db_index % MTHCA_DB_REC_PER_PAGE;
676
677 page = dev->db_tab->page + i;
678
679 mutex_lock(&dev->db_tab->mutex);
680
681 page->db_rec[j] = 0;
682 if (i >= dev->db_tab->min_group2)
683 j = MTHCA_DB_REC_PER_PAGE - 1 - j;
684 clear_bit(j, page->used);
685
686 if (bitmap_empty(page->used, MTHCA_DB_REC_PER_PAGE) &&
687 i >= dev->db_tab->max_group1 - 1) {
688 mthca_UNMAP_ICM(dev, mthca_uarc_virt(dev, &dev->driver_uar, i), 1, &status);
689
690 dma_free_coherent(&dev->pdev->dev, MTHCA_ICM_PAGE_SIZE,
691 page->db_rec, page->mapping);
692 page->db_rec = NULL;
693
694 if (i == dev->db_tab->max_group1) {
695 --dev->db_tab->max_group1;
696 /* XXX may be able to unmap more pages now */
697 }
698 if (i == dev->db_tab->min_group2)
699 ++dev->db_tab->min_group2;
700 }
701
702 mutex_unlock(&dev->db_tab->mutex);
703 }
704
705 int mthca_init_db_tab(struct mthca_dev *dev)
706 {
707 int i;
708
709 if (!mthca_is_memfree(dev))
710 return 0;
711
712 dev->db_tab = kmalloc(sizeof *dev->db_tab, GFP_KERNEL);
713 if (!dev->db_tab)
714 return -ENOMEM;
715
716 mutex_init(&dev->db_tab->mutex);
717
718 dev->db_tab->npages = dev->uar_table.uarc_size / MTHCA_ICM_PAGE_SIZE;
719 dev->db_tab->max_group1 = 0;
720 dev->db_tab->min_group2 = dev->db_tab->npages - 1;
721
722 dev->db_tab->page = kmalloc(dev->db_tab->npages *
723 sizeof *dev->db_tab->page,
724 GFP_KERNEL);
725 if (!dev->db_tab->page) {
726 kfree(dev->db_tab);
727 return -ENOMEM;
728 }
729
730 for (i = 0; i < dev->db_tab->npages; ++i)
731 dev->db_tab->page[i].db_rec = NULL;
732
733 return 0;
734 }
735
736 void mthca_cleanup_db_tab(struct mthca_dev *dev)
737 {
738 int i;
739 u8 status;
740
741 if (!mthca_is_memfree(dev))
742 return;
743
744 /*
745 * Because we don't always free our UARC pages when they
746 * become empty to make mthca_free_db() simpler we need to
747 * make a sweep through the doorbell pages and free any
748 * leftover pages now.
749 */
750 for (i = 0; i < dev->db_tab->npages; ++i) {
751 if (!dev->db_tab->page[i].db_rec)
752 continue;
753
754 if (!bitmap_empty(dev->db_tab->page[i].used, MTHCA_DB_REC_PER_PAGE))
755 mthca_warn(dev, "Kernel UARC page %d not empty\n", i);
756
757 mthca_UNMAP_ICM(dev, mthca_uarc_virt(dev, &dev->driver_uar, i), 1, &status);
758
759 dma_free_coherent(&dev->pdev->dev, MTHCA_ICM_PAGE_SIZE,
760 dev->db_tab->page[i].db_rec,
761 dev->db_tab->page[i].mapping);
762 }
763
764 kfree(dev->db_tab->page);
765 kfree(dev->db_tab);
766 }
Linux kernel - Deliverables
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