Pull sgi into release branch
[linux-2.6] / 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
39 #include "mthca_memfree.h"
40 #include "mthca_dev.h"
41 #include "mthca_cmd.h"
42
43 /*
44  * We allocate in as big chunks as we can, up to a maximum of 256 KB
45  * per chunk.
46  */
47 enum {
48         MTHCA_ICM_ALLOC_SIZE   = 1 << 18,
49         MTHCA_TABLE_CHUNK_SIZE = 1 << 18
50 };
51
52 struct mthca_user_db_table {
53         struct mutex mutex;
54         struct {
55                 u64                uvirt;
56                 struct scatterlist mem;
57                 int                refcount;
58         }                page[0];
59 };
60
61 void mthca_free_icm(struct mthca_dev *dev, struct mthca_icm *icm)
62 {
63         struct mthca_icm_chunk *chunk, *tmp;
64         int i;
65
66         if (!icm)
67                 return;
68
69         list_for_each_entry_safe(chunk, tmp, &icm->chunk_list, list) {
70                 if (chunk->nsg > 0)
71                         pci_unmap_sg(dev->pdev, chunk->mem, chunk->npages,
72                                      PCI_DMA_BIDIRECTIONAL);
73
74                 for (i = 0; i < chunk->npages; ++i)
75                         __free_pages(chunk->mem[i].page,
76                                      get_order(chunk->mem[i].length));
77
78                 kfree(chunk);
79         }
80
81         kfree(icm);
82 }
83
84 struct mthca_icm *mthca_alloc_icm(struct mthca_dev *dev, int npages,
85                                   gfp_t gfp_mask)
86 {
87         struct mthca_icm *icm;
88         struct mthca_icm_chunk *chunk = NULL;
89         int cur_order;
90
91         icm = kmalloc(sizeof *icm, gfp_mask & ~(__GFP_HIGHMEM | __GFP_NOWARN));
92         if (!icm)
93                 return icm;
94
95         icm->refcount = 0;
96         INIT_LIST_HEAD(&icm->chunk_list);
97
98         cur_order = get_order(MTHCA_ICM_ALLOC_SIZE);
99
100         while (npages > 0) {
101                 if (!chunk) {
102                         chunk = kmalloc(sizeof *chunk,
103                                         gfp_mask & ~(__GFP_HIGHMEM | __GFP_NOWARN));
104                         if (!chunk)
105                                 goto fail;
106
107                         chunk->npages = 0;
108                         chunk->nsg    = 0;
109                         list_add_tail(&chunk->list, &icm->chunk_list);
110                 }
111
112                 while (1 << cur_order > npages)
113                         --cur_order;
114
115                 chunk->mem[chunk->npages].page = alloc_pages(gfp_mask, cur_order);
116                 if (chunk->mem[chunk->npages].page) {
117                         chunk->mem[chunk->npages].length = PAGE_SIZE << cur_order;
118                         chunk->mem[chunk->npages].offset = 0;
119
120                         if (++chunk->npages == MTHCA_ICM_CHUNK_LEN) {
121                                 chunk->nsg = pci_map_sg(dev->pdev, chunk->mem,
122                                                         chunk->npages,
123                                                         PCI_DMA_BIDIRECTIONAL);
124
125                                 if (chunk->nsg <= 0)
126                                         goto fail;
127
128                                 chunk = NULL;
129                         }
130
131                         npages -= 1 << cur_order;
132                 } else {
133                         --cur_order;
134                         if (cur_order < 0)
135                                 goto fail;
136                 }
137         }
138
139         if (chunk) {
140                 chunk->nsg = pci_map_sg(dev->pdev, chunk->mem,
141                                         chunk->npages,
142                                         PCI_DMA_BIDIRECTIONAL);
143
144                 if (chunk->nsg <= 0)
145                         goto fail;
146         }
147
148         return icm;
149
150 fail:
151         mthca_free_icm(dev, icm);
152         return NULL;
153 }
154
155 int mthca_table_get(struct mthca_dev *dev, struct mthca_icm_table *table, int obj)
156 {
157         int i = (obj & (table->num_obj - 1)) * table->obj_size / MTHCA_TABLE_CHUNK_SIZE;
158         int ret = 0;
159         u8 status;
160
161         mutex_lock(&table->mutex);
162
163         if (table->icm[i]) {
164                 ++table->icm[i]->refcount;
165                 goto out;
166         }
167
168         table->icm[i] = mthca_alloc_icm(dev, MTHCA_TABLE_CHUNK_SIZE >> PAGE_SHIFT,
169                                         (table->lowmem ? GFP_KERNEL : GFP_HIGHUSER) |
170                                         __GFP_NOWARN);
171         if (!table->icm[i]) {
172                 ret = -ENOMEM;
173                 goto out;
174         }
175
176         if (mthca_MAP_ICM(dev, table->icm[i], table->virt + i * MTHCA_TABLE_CHUNK_SIZE,
177                           &status) || status) {
178                 mthca_free_icm(dev, table->icm[i]);
179                 table->icm[i] = NULL;
180                 ret = -ENOMEM;
181                 goto out;
182         }
183
184         ++table->icm[i]->refcount;
185
186 out:
187         mutex_unlock(&table->mutex);
188         return ret;
189 }
190
191 void mthca_table_put(struct mthca_dev *dev, struct mthca_icm_table *table, int obj)
192 {
193         int i;
194         u8 status;
195
196         if (!mthca_is_memfree(dev))
197                 return;
198
199         i = (obj & (table->num_obj - 1)) * table->obj_size / MTHCA_TABLE_CHUNK_SIZE;
200
201         mutex_lock(&table->mutex);
202
203         if (--table->icm[i]->refcount == 0) {
204                 mthca_UNMAP_ICM(dev, table->virt + i * MTHCA_TABLE_CHUNK_SIZE,
205                                 MTHCA_TABLE_CHUNK_SIZE / MTHCA_ICM_PAGE_SIZE,
206                                 &status);
207                 mthca_free_icm(dev, table->icm[i]);
208                 table->icm[i] = NULL;
209         }
210
211         mutex_unlock(&table->mutex);
212 }
213
214 void *mthca_table_find(struct mthca_icm_table *table, int obj)
215 {
216         int idx, offset, i;
217         struct mthca_icm_chunk *chunk;
218         struct mthca_icm *icm;
219         struct page *page = NULL;
220
221         if (!table->lowmem)
222                 return NULL;
223
224         mutex_lock(&table->mutex);
225
226         idx = (obj & (table->num_obj - 1)) * table->obj_size;
227         icm = table->icm[idx / MTHCA_TABLE_CHUNK_SIZE];
228         offset = idx % MTHCA_TABLE_CHUNK_SIZE;
229
230         if (!icm)
231                 goto out;
232
233         list_for_each_entry(chunk, &icm->chunk_list, list) {
234                 for (i = 0; i < chunk->npages; ++i) {
235                         if (chunk->mem[i].length > offset) {
236                                 page = chunk->mem[i].page;
237                                 goto out;
238                         }
239                         offset -= chunk->mem[i].length;
240                 }
241         }
242
243 out:
244         mutex_unlock(&table->mutex);
245         return page ? lowmem_page_address(page) + offset : NULL;
246 }
247
248 int mthca_table_get_range(struct mthca_dev *dev, struct mthca_icm_table *table,
249                           int start, int end)
250 {
251         int inc = MTHCA_TABLE_CHUNK_SIZE / table->obj_size;
252         int i, err;
253
254         for (i = start; i <= end; i += inc) {
255                 err = mthca_table_get(dev, table, i);
256                 if (err)
257                         goto fail;
258         }
259
260         return 0;
261
262 fail:
263         while (i > start) {
264                 i -= inc;
265                 mthca_table_put(dev, table, i);
266         }
267
268         return err;
269 }
270
271 void mthca_table_put_range(struct mthca_dev *dev, struct mthca_icm_table *table,
272                            int start, int end)
273 {
274         int i;
275
276         if (!mthca_is_memfree(dev))
277                 return;
278
279         for (i = start; i <= end; i += MTHCA_TABLE_CHUNK_SIZE / table->obj_size)
280                 mthca_table_put(dev, table, i);
281 }
282
283 struct mthca_icm_table *mthca_alloc_icm_table(struct mthca_dev *dev,
284                                               u64 virt, int obj_size,
285                                               int nobj, int reserved,
286                                               int use_lowmem)
287 {
288         struct mthca_icm_table *table;
289         int num_icm;
290         unsigned chunk_size;
291         int i;
292         u8 status;
293
294         num_icm = (obj_size * nobj + MTHCA_TABLE_CHUNK_SIZE - 1) / MTHCA_TABLE_CHUNK_SIZE;
295
296         table = kmalloc(sizeof *table + num_icm * sizeof *table->icm, GFP_KERNEL);
297         if (!table)
298                 return NULL;
299
300         table->virt     = virt;
301         table->num_icm  = num_icm;
302         table->num_obj  = nobj;
303         table->obj_size = obj_size;
304         table->lowmem   = use_lowmem;
305         mutex_init(&table->mutex);
306
307         for (i = 0; i < num_icm; ++i)
308                 table->icm[i] = NULL;
309
310         for (i = 0; i * MTHCA_TABLE_CHUNK_SIZE < reserved * obj_size; ++i) {
311                 chunk_size = MTHCA_TABLE_CHUNK_SIZE;
312                 if ((i + 1) * MTHCA_TABLE_CHUNK_SIZE > nobj * obj_size)
313                         chunk_size = nobj * obj_size - i * MTHCA_TABLE_CHUNK_SIZE;
314
315                 table->icm[i] = mthca_alloc_icm(dev, chunk_size >> PAGE_SHIFT,
316                                                 (use_lowmem ? GFP_KERNEL : GFP_HIGHUSER) |
317                                                 __GFP_NOWARN);
318                 if (!table->icm[i])
319                         goto err;
320                 if (mthca_MAP_ICM(dev, table->icm[i], virt + i * MTHCA_TABLE_CHUNK_SIZE,
321                                   &status) || status) {
322                         mthca_free_icm(dev, table->icm[i]);
323                         table->icm[i] = NULL;
324                         goto err;
325                 }
326
327                 /*
328                  * Add a reference to this ICM chunk so that it never
329                  * gets freed (since it contains reserved firmware objects).
330                  */
331                 ++table->icm[i]->refcount;
332         }
333
334         return table;
335
336 err:
337         for (i = 0; i < num_icm; ++i)
338                 if (table->icm[i]) {
339                         mthca_UNMAP_ICM(dev, virt + i * MTHCA_TABLE_CHUNK_SIZE,
340                                         MTHCA_TABLE_CHUNK_SIZE / MTHCA_ICM_PAGE_SIZE,
341                                         &status);
342                         mthca_free_icm(dev, table->icm[i]);
343                 }
344
345         kfree(table);
346
347         return NULL;
348 }
349
350 void mthca_free_icm_table(struct mthca_dev *dev, struct mthca_icm_table *table)
351 {
352         int i;
353         u8 status;
354
355         for (i = 0; i < table->num_icm; ++i)
356                 if (table->icm[i]) {
357                         mthca_UNMAP_ICM(dev, table->virt + i * MTHCA_TABLE_CHUNK_SIZE,
358                                         MTHCA_TABLE_CHUNK_SIZE / MTHCA_ICM_PAGE_SIZE,
359                                         &status);
360                         mthca_free_icm(dev, table->icm[i]);
361                 }
362
363         kfree(table);
364 }
365
366 static u64 mthca_uarc_virt(struct mthca_dev *dev, struct mthca_uar *uar, int page)
367 {
368         return dev->uar_table.uarc_base +
369                 uar->index * dev->uar_table.uarc_size +
370                 page * MTHCA_ICM_PAGE_SIZE;
371 }
372
373 int mthca_map_user_db(struct mthca_dev *dev, struct mthca_uar *uar,
374                       struct mthca_user_db_table *db_tab, int index, u64 uaddr)
375 {
376         int ret = 0;
377         u8 status;
378         int i;
379
380         if (!mthca_is_memfree(dev))
381                 return 0;
382
383         if (index < 0 || index > dev->uar_table.uarc_size / 8)
384                 return -EINVAL;
385
386         mutex_lock(&db_tab->mutex);
387
388         i = index / MTHCA_DB_REC_PER_PAGE;
389
390         if ((db_tab->page[i].refcount >= MTHCA_DB_REC_PER_PAGE)       ||
391             (db_tab->page[i].uvirt && db_tab->page[i].uvirt != uaddr) ||
392             (uaddr & 4095)) {
393                 ret = -EINVAL;
394                 goto out;
395         }
396
397         if (db_tab->page[i].refcount) {
398                 ++db_tab->page[i].refcount;
399                 goto out;
400         }
401
402         ret = get_user_pages(current, current->mm, uaddr & PAGE_MASK, 1, 1, 0,
403                              &db_tab->page[i].mem.page, NULL);
404         if (ret < 0)
405                 goto out;
406
407         db_tab->page[i].mem.length = MTHCA_ICM_PAGE_SIZE;
408         db_tab->page[i].mem.offset = uaddr & ~PAGE_MASK;
409
410         ret = pci_map_sg(dev->pdev, &db_tab->page[i].mem, 1, PCI_DMA_TODEVICE);
411         if (ret < 0) {
412                 put_page(db_tab->page[i].mem.page);
413                 goto out;
414         }
415
416         ret = mthca_MAP_ICM_page(dev, sg_dma_address(&db_tab->page[i].mem),
417                                  mthca_uarc_virt(dev, uar, i), &status);
418         if (!ret && status)
419                 ret = -EINVAL;
420         if (ret) {
421                 pci_unmap_sg(dev->pdev, &db_tab->page[i].mem, 1, PCI_DMA_TODEVICE);
422                 put_page(db_tab->page[i].mem.page);
423                 goto out;
424         }
425
426         db_tab->page[i].uvirt    = uaddr;
427         db_tab->page[i].refcount = 1;
428
429 out:
430         mutex_unlock(&db_tab->mutex);
431         return ret;
432 }
433
434 void mthca_unmap_user_db(struct mthca_dev *dev, struct mthca_uar *uar,
435                          struct mthca_user_db_table *db_tab, int index)
436 {
437         if (!mthca_is_memfree(dev))
438                 return;
439
440         /*
441          * To make our bookkeeping simpler, we don't unmap DB
442          * pages until we clean up the whole db table.
443          */
444
445         mutex_lock(&db_tab->mutex);
446
447         --db_tab->page[index / MTHCA_DB_REC_PER_PAGE].refcount;
448
449         mutex_unlock(&db_tab->mutex);
450 }
451
452 struct mthca_user_db_table *mthca_init_user_db_tab(struct mthca_dev *dev)
453 {
454         struct mthca_user_db_table *db_tab;
455         int npages;
456         int i;
457
458         if (!mthca_is_memfree(dev))
459                 return NULL;
460
461         npages = dev->uar_table.uarc_size / MTHCA_ICM_PAGE_SIZE;
462         db_tab = kmalloc(sizeof *db_tab + npages * sizeof *db_tab->page, GFP_KERNEL);
463         if (!db_tab)
464                 return ERR_PTR(-ENOMEM);
465
466         mutex_init(&db_tab->mutex);
467         for (i = 0; i < npages; ++i) {
468                 db_tab->page[i].refcount = 0;
469                 db_tab->page[i].uvirt    = 0;
470         }
471
472         return db_tab;
473 }
474
475 void mthca_cleanup_user_db_tab(struct mthca_dev *dev, struct mthca_uar *uar,
476                                struct mthca_user_db_table *db_tab)
477 {
478         int i;
479         u8 status;
480
481         if (!mthca_is_memfree(dev))
482                 return;
483
484         for (i = 0; i < dev->uar_table.uarc_size / MTHCA_ICM_PAGE_SIZE; ++i) {
485                 if (db_tab->page[i].uvirt) {
486                         mthca_UNMAP_ICM(dev, mthca_uarc_virt(dev, uar, i), 1, &status);
487                         pci_unmap_sg(dev->pdev, &db_tab->page[i].mem, 1, PCI_DMA_TODEVICE);
488                         put_page(db_tab->page[i].mem.page);
489                 }
490         }
491
492         kfree(db_tab);
493 }
494
495 int mthca_alloc_db(struct mthca_dev *dev, enum mthca_db_type type,
496                    u32 qn, __be32 **db)
497 {
498         int group;
499         int start, end, dir;
500         int i, j;
501         struct mthca_db_page *page;
502         int ret = 0;
503         u8 status;
504
505         mutex_lock(&dev->db_tab->mutex);
506
507         switch (type) {
508         case MTHCA_DB_TYPE_CQ_ARM:
509         case MTHCA_DB_TYPE_SQ:
510                 group = 0;
511                 start = 0;
512                 end   = dev->db_tab->max_group1;
513                 dir   = 1;
514                 break;
515
516         case MTHCA_DB_TYPE_CQ_SET_CI:
517         case MTHCA_DB_TYPE_RQ:
518         case MTHCA_DB_TYPE_SRQ:
519                 group = 1;
520                 start = dev->db_tab->npages - 1;
521                 end   = dev->db_tab->min_group2;
522                 dir   = -1;
523                 break;
524
525         default:
526                 ret = -EINVAL;
527                 goto out;
528         }
529
530         for (i = start; i != end; i += dir)
531                 if (dev->db_tab->page[i].db_rec &&
532                     !bitmap_full(dev->db_tab->page[i].used,
533                                  MTHCA_DB_REC_PER_PAGE)) {
534                         page = dev->db_tab->page + i;
535                         goto found;
536                 }
537
538         for (i = start; i != end; i += dir)
539                 if (!dev->db_tab->page[i].db_rec) {
540                         page = dev->db_tab->page + i;
541                         goto alloc;
542                 }
543
544         if (dev->db_tab->max_group1 >= dev->db_tab->min_group2 - 1) {
545                 ret = -ENOMEM;
546                 goto out;
547         }
548
549         if (group == 0)
550                 ++dev->db_tab->max_group1;
551         else
552                 --dev->db_tab->min_group2;
553
554         page = dev->db_tab->page + end;
555
556 alloc:
557         page->db_rec = dma_alloc_coherent(&dev->pdev->dev, MTHCA_ICM_PAGE_SIZE,
558                                           &page->mapping, GFP_KERNEL);
559         if (!page->db_rec) {
560                 ret = -ENOMEM;
561                 goto out;
562         }
563         memset(page->db_rec, 0, MTHCA_ICM_PAGE_SIZE);
564
565         ret = mthca_MAP_ICM_page(dev, page->mapping,
566                                  mthca_uarc_virt(dev, &dev->driver_uar, i), &status);
567         if (!ret && status)
568                 ret = -EINVAL;
569         if (ret) {
570                 dma_free_coherent(&dev->pdev->dev, MTHCA_ICM_PAGE_SIZE,
571                                   page->db_rec, page->mapping);
572                 goto out;
573         }
574
575         bitmap_zero(page->used, MTHCA_DB_REC_PER_PAGE);
576
577 found:
578         j = find_first_zero_bit(page->used, MTHCA_DB_REC_PER_PAGE);
579         set_bit(j, page->used);
580
581         if (group == 1)
582                 j = MTHCA_DB_REC_PER_PAGE - 1 - j;
583
584         ret = i * MTHCA_DB_REC_PER_PAGE + j;
585
586         page->db_rec[j] = cpu_to_be64((qn << 8) | (type << 5));
587
588         *db = (__be32 *) &page->db_rec[j];
589
590 out:
591         mutex_unlock(&dev->db_tab->mutex);
592
593         return ret;
594 }
595
596 void mthca_free_db(struct mthca_dev *dev, int type, int db_index)
597 {
598         int i, j;
599         struct mthca_db_page *page;
600         u8 status;
601
602         i = db_index / MTHCA_DB_REC_PER_PAGE;
603         j = db_index % MTHCA_DB_REC_PER_PAGE;
604
605         page = dev->db_tab->page + i;
606
607         mutex_lock(&dev->db_tab->mutex);
608
609         page->db_rec[j] = 0;
610         if (i >= dev->db_tab->min_group2)
611                 j = MTHCA_DB_REC_PER_PAGE - 1 - j;
612         clear_bit(j, page->used);
613
614         if (bitmap_empty(page->used, MTHCA_DB_REC_PER_PAGE) &&
615             i >= dev->db_tab->max_group1 - 1) {
616                 mthca_UNMAP_ICM(dev, mthca_uarc_virt(dev, &dev->driver_uar, i), 1, &status);
617
618                 dma_free_coherent(&dev->pdev->dev, MTHCA_ICM_PAGE_SIZE,
619                                   page->db_rec, page->mapping);
620                 page->db_rec = NULL;
621
622                 if (i == dev->db_tab->max_group1) {
623                         --dev->db_tab->max_group1;
624                         /* XXX may be able to unmap more pages now */
625                 }
626                 if (i == dev->db_tab->min_group2)
627                         ++dev->db_tab->min_group2;
628         }
629
630         mutex_unlock(&dev->db_tab->mutex);
631 }
632
633 int mthca_init_db_tab(struct mthca_dev *dev)
634 {
635         int i;
636
637         if (!mthca_is_memfree(dev))
638                 return 0;
639
640         dev->db_tab = kmalloc(sizeof *dev->db_tab, GFP_KERNEL);
641         if (!dev->db_tab)
642                 return -ENOMEM;
643
644         mutex_init(&dev->db_tab->mutex);
645
646         dev->db_tab->npages     = dev->uar_table.uarc_size / MTHCA_ICM_PAGE_SIZE;
647         dev->db_tab->max_group1 = 0;
648         dev->db_tab->min_group2 = dev->db_tab->npages - 1;
649
650         dev->db_tab->page = kmalloc(dev->db_tab->npages *
651                                     sizeof *dev->db_tab->page,
652                                     GFP_KERNEL);
653         if (!dev->db_tab->page) {
654                 kfree(dev->db_tab);
655                 return -ENOMEM;
656         }
657
658         for (i = 0; i < dev->db_tab->npages; ++i)
659                 dev->db_tab->page[i].db_rec = NULL;
660
661         return 0;
662 }
663
664 void mthca_cleanup_db_tab(struct mthca_dev *dev)
665 {
666         int i;
667         u8 status;
668
669         if (!mthca_is_memfree(dev))
670                 return;
671
672         /*
673          * Because we don't always free our UARC pages when they
674          * become empty to make mthca_free_db() simpler we need to
675          * make a sweep through the doorbell pages and free any
676          * leftover pages now.
677          */
678         for (i = 0; i < dev->db_tab->npages; ++i) {
679                 if (!dev->db_tab->page[i].db_rec)
680                         continue;
681
682                 if (!bitmap_empty(dev->db_tab->page[i].used, MTHCA_DB_REC_PER_PAGE))
683                         mthca_warn(dev, "Kernel UARC page %d not empty\n", i);
684
685                 mthca_UNMAP_ICM(dev, mthca_uarc_virt(dev, &dev->driver_uar, i), 1, &status);
686
687                 dma_free_coherent(&dev->pdev->dev, MTHCA_ICM_PAGE_SIZE,
688                                   dev->db_tab->page[i].db_rec,
689                                   dev->db_tab->page[i].mapping);
690         }
691
692         kfree(dev->db_tab->page);
693         kfree(dev->db_tab);
694 }