[ACPI] Merge acpi-2.6.12 branch into 2.6.13-rc3
[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  *
5  * This software is available to you under a choice of one of two
6  * licenses.  You may choose to be licensed under the terms of the GNU
7  * General Public License (GPL) Version 2, available from the file
8  * COPYING in the main directory of this source tree, or the
9  * OpenIB.org BSD license below:
10  *
11  *     Redistribution and use in source and binary forms, with or
12  *     without modification, are permitted provided that the following
13  *     conditions are met:
14  *
15  *      - Redistributions of source code must retain the above
16  *        copyright notice, this list of conditions and the following
17  *        disclaimer.
18  *
19  *      - Redistributions in binary form must reproduce the above
20  *        copyright notice, this list of conditions and the following
21  *        disclaimer in the documentation and/or other materials
22  *        provided with the distribution.
23  *
24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31  * SOFTWARE.
32  *
33  * $Id$
34  */
35
36 #include <linux/mm.h>
37
38 #include "mthca_memfree.h"
39 #include "mthca_dev.h"
40 #include "mthca_cmd.h"
41
42 /*
43  * We allocate in as big chunks as we can, up to a maximum of 256 KB
44  * per chunk.
45  */
46 enum {
47         MTHCA_ICM_ALLOC_SIZE   = 1 << 18,
48         MTHCA_TABLE_CHUNK_SIZE = 1 << 18
49 };
50
51 struct mthca_user_db_table {
52         struct semaphore mutex;
53         struct {
54                 u64                uvirt;
55                 struct scatterlist mem;
56                 int                refcount;
57         }                page[0];
58 };
59
60 void mthca_free_icm(struct mthca_dev *dev, struct mthca_icm *icm)
61 {
62         struct mthca_icm_chunk *chunk, *tmp;
63         int i;
64
65         if (!icm)
66                 return;
67
68         list_for_each_entry_safe(chunk, tmp, &icm->chunk_list, list) {
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                 kfree(chunk);
78         }
79
80         kfree(icm);
81 }
82
83 struct mthca_icm *mthca_alloc_icm(struct mthca_dev *dev, int npages,
84                                   unsigned int gfp_mask)
85 {
86         struct mthca_icm *icm;
87         struct mthca_icm_chunk *chunk = NULL;
88         int cur_order;
89
90         icm = kmalloc(sizeof *icm, gfp_mask & ~(__GFP_HIGHMEM | __GFP_NOWARN));
91         if (!icm)
92                 return icm;
93
94         icm->refcount = 0;
95         INIT_LIST_HEAD(&icm->chunk_list);
96
97         cur_order = get_order(MTHCA_ICM_ALLOC_SIZE);
98
99         while (npages > 0) {
100                 if (!chunk) {
101                         chunk = kmalloc(sizeof *chunk,
102                                         gfp_mask & ~(__GFP_HIGHMEM | __GFP_NOWARN));
103                         if (!chunk)
104                                 goto fail;
105
106                         chunk->npages = 0;
107                         chunk->nsg    = 0;
108                         list_add_tail(&chunk->list, &icm->chunk_list);
109                 }
110
111                 while (1 << cur_order > npages)
112                         --cur_order;
113
114                 chunk->mem[chunk->npages].page = alloc_pages(gfp_mask, cur_order);
115                 if (chunk->mem[chunk->npages].page) {
116                         chunk->mem[chunk->npages].length = PAGE_SIZE << cur_order;
117                         chunk->mem[chunk->npages].offset = 0;
118
119                         if (++chunk->npages == MTHCA_ICM_CHUNK_LEN) {
120                                 chunk->nsg = pci_map_sg(dev->pdev, chunk->mem,
121                                                         chunk->npages,
122                                                         PCI_DMA_BIDIRECTIONAL);
123
124                                 if (chunk->nsg <= 0)
125                                         goto fail;
126
127                                 chunk = NULL;
128                         }
129
130                         npages -= 1 << cur_order;
131                 } else {
132                         --cur_order;
133                         if (cur_order < 0)
134                                 goto fail;
135                 }
136         }
137
138         if (chunk) {
139                 chunk->nsg = pci_map_sg(dev->pdev, chunk->mem,
140                                         chunk->npages,
141                                         PCI_DMA_BIDIRECTIONAL);
142
143                 if (chunk->nsg <= 0)
144                         goto fail;
145         }
146
147         return icm;
148
149 fail:
150         mthca_free_icm(dev, icm);
151         return NULL;
152 }
153
154 int mthca_table_get(struct mthca_dev *dev, struct mthca_icm_table *table, int obj)
155 {
156         int i = (obj & (table->num_obj - 1)) * table->obj_size / MTHCA_TABLE_CHUNK_SIZE;
157         int ret = 0;
158         u8 status;
159
160         down(&table->mutex);
161
162         if (table->icm[i]) {
163                 ++table->icm[i]->refcount;
164                 goto out;
165         }
166
167         table->icm[i] = mthca_alloc_icm(dev, MTHCA_TABLE_CHUNK_SIZE >> PAGE_SHIFT,
168                                         (table->lowmem ? GFP_KERNEL : GFP_HIGHUSER) |
169                                         __GFP_NOWARN);
170         if (!table->icm[i]) {
171                 ret = -ENOMEM;
172                 goto out;
173         }
174
175         if (mthca_MAP_ICM(dev, table->icm[i], table->virt + i * MTHCA_TABLE_CHUNK_SIZE,
176                           &status) || status) {
177                 mthca_free_icm(dev, table->icm[i]);
178                 table->icm[i] = NULL;
179                 ret = -ENOMEM;
180                 goto out;
181         }
182
183         ++table->icm[i]->refcount;
184
185 out:
186         up(&table->mutex);
187         return ret;
188 }
189
190 void mthca_table_put(struct mthca_dev *dev, struct mthca_icm_table *table, int obj)
191 {
192         int i;
193         u8 status;
194
195         if (!mthca_is_memfree(dev))
196                 return;
197
198         i = (obj & (table->num_obj - 1)) * table->obj_size / MTHCA_TABLE_CHUNK_SIZE;
199
200         down(&table->mutex);
201
202         if (--table->icm[i]->refcount == 0) {
203                 mthca_UNMAP_ICM(dev, table->virt + i * MTHCA_TABLE_CHUNK_SIZE,
204                                 MTHCA_TABLE_CHUNK_SIZE >> 12, &status);
205                 mthca_free_icm(dev, table->icm[i]);
206                 table->icm[i] = NULL;
207         }
208
209         up(&table->mutex);
210 }
211
212 void *mthca_table_find(struct mthca_icm_table *table, int obj)
213 {
214         int idx, offset, i;
215         struct mthca_icm_chunk *chunk;
216         struct mthca_icm *icm;
217         struct page *page = NULL;
218
219         if (!table->lowmem)
220                 return NULL;
221
222         down(&table->mutex);
223
224         idx = (obj & (table->num_obj - 1)) * table->obj_size;
225         icm = table->icm[idx / MTHCA_TABLE_CHUNK_SIZE];
226         offset = idx % MTHCA_TABLE_CHUNK_SIZE;
227
228         if (!icm)
229                 goto out;
230
231         list_for_each_entry(chunk, &icm->chunk_list, list) {
232                 for (i = 0; i < chunk->npages; ++i) {
233                         if (chunk->mem[i].length >= offset) {
234                                 page = chunk->mem[i].page;
235                                 break;
236                         }
237                         offset -= chunk->mem[i].length;
238                 }
239         }
240
241 out:
242         up(&table->mutex);
243         return page ? lowmem_page_address(page) + offset : NULL;
244 }
245
246 int mthca_table_get_range(struct mthca_dev *dev, struct mthca_icm_table *table,
247                           int start, int end)
248 {
249         int inc = MTHCA_TABLE_CHUNK_SIZE / table->obj_size;
250         int i, err;
251
252         for (i = start; i <= end; i += inc) {
253                 err = mthca_table_get(dev, table, i);
254                 if (err)
255                         goto fail;
256         }
257
258         return 0;
259
260 fail:
261         while (i > start) {
262                 i -= inc;
263                 mthca_table_put(dev, table, i);
264         }
265
266         return err;
267 }
268
269 void mthca_table_put_range(struct mthca_dev *dev, struct mthca_icm_table *table,
270                            int start, int end)
271 {
272         int i;
273
274         if (!mthca_is_memfree(dev))
275                 return;
276
277         for (i = start; i <= end; i += MTHCA_TABLE_CHUNK_SIZE / table->obj_size)
278                 mthca_table_put(dev, table, i);
279 }
280
281 struct mthca_icm_table *mthca_alloc_icm_table(struct mthca_dev *dev,
282                                               u64 virt, int obj_size,
283                                               int nobj, int reserved,
284                                               int use_lowmem)
285 {
286         struct mthca_icm_table *table;
287         int num_icm;
288         int i;
289         u8 status;
290
291         num_icm = obj_size * nobj / MTHCA_TABLE_CHUNK_SIZE;
292
293         table = kmalloc(sizeof *table + num_icm * sizeof *table->icm, GFP_KERNEL);
294         if (!table)
295                 return NULL;
296
297         table->virt     = virt;
298         table->num_icm  = num_icm;
299         table->num_obj  = nobj;
300         table->obj_size = obj_size;
301         table->lowmem   = use_lowmem;
302         init_MUTEX(&table->mutex);
303
304         for (i = 0; i < num_icm; ++i)
305                 table->icm[i] = NULL;
306
307         for (i = 0; i * MTHCA_TABLE_CHUNK_SIZE < reserved * obj_size; ++i) {
308                 table->icm[i] = mthca_alloc_icm(dev, MTHCA_TABLE_CHUNK_SIZE >> PAGE_SHIFT,
309                                                 (use_lowmem ? GFP_KERNEL : GFP_HIGHUSER) |
310                                                 __GFP_NOWARN);
311                 if (!table->icm[i])
312                         goto err;
313                 if (mthca_MAP_ICM(dev, table->icm[i], virt + i * MTHCA_TABLE_CHUNK_SIZE,
314                                   &status) || status) {
315                         mthca_free_icm(dev, table->icm[i]);
316                         table->icm[i] = NULL;
317                         goto err;
318                 }
319
320                 /*
321                  * Add a reference to this ICM chunk so that it never
322                  * gets freed (since it contains reserved firmware objects).
323                  */
324                 ++table->icm[i]->refcount;
325         }
326
327         return table;
328
329 err:
330         for (i = 0; i < num_icm; ++i)
331                 if (table->icm[i]) {
332                         mthca_UNMAP_ICM(dev, virt + i * MTHCA_TABLE_CHUNK_SIZE,
333                                         MTHCA_TABLE_CHUNK_SIZE >> 12, &status);
334                         mthca_free_icm(dev, table->icm[i]);
335                 }
336
337         kfree(table);
338
339         return NULL;
340 }
341
342 void mthca_free_icm_table(struct mthca_dev *dev, struct mthca_icm_table *table)
343 {
344         int i;
345         u8 status;
346
347         for (i = 0; i < table->num_icm; ++i)
348                 if (table->icm[i]) {
349                         mthca_UNMAP_ICM(dev, table->virt + i * MTHCA_TABLE_CHUNK_SIZE,
350                                         MTHCA_TABLE_CHUNK_SIZE >> 12, &status);
351                         mthca_free_icm(dev, table->icm[i]);
352                 }
353
354         kfree(table);
355 }
356
357 static u64 mthca_uarc_virt(struct mthca_dev *dev, struct mthca_uar *uar, int page)
358 {
359         return dev->uar_table.uarc_base +
360                 uar->index * dev->uar_table.uarc_size +
361                 page * 4096;
362 }
363
364 int mthca_map_user_db(struct mthca_dev *dev, struct mthca_uar *uar,
365                       struct mthca_user_db_table *db_tab, int index, u64 uaddr)
366 {
367         int ret = 0;
368         u8 status;
369         int i;
370
371         if (!mthca_is_memfree(dev))
372                 return 0;
373
374         if (index < 0 || index > dev->uar_table.uarc_size / 8)
375                 return -EINVAL;
376
377         down(&db_tab->mutex);
378
379         i = index / MTHCA_DB_REC_PER_PAGE;
380
381         if ((db_tab->page[i].refcount >= MTHCA_DB_REC_PER_PAGE)       ||
382             (db_tab->page[i].uvirt && db_tab->page[i].uvirt != uaddr) ||
383             (uaddr & 4095)) {
384                 ret = -EINVAL;
385                 goto out;
386         }
387
388         if (db_tab->page[i].refcount) {
389                 ++db_tab->page[i].refcount;
390                 goto out;
391         }
392
393         ret = get_user_pages(current, current->mm, uaddr & PAGE_MASK, 1, 1, 0,
394                              &db_tab->page[i].mem.page, NULL);
395         if (ret < 0)
396                 goto out;
397
398         db_tab->page[i].mem.length = 4096;
399         db_tab->page[i].mem.offset = uaddr & ~PAGE_MASK;
400
401         ret = pci_map_sg(dev->pdev, &db_tab->page[i].mem, 1, PCI_DMA_TODEVICE);
402         if (ret < 0) {
403                 put_page(db_tab->page[i].mem.page);
404                 goto out;
405         }
406
407         ret = mthca_MAP_ICM_page(dev, sg_dma_address(&db_tab->page[i].mem),
408                                  mthca_uarc_virt(dev, uar, i), &status);
409         if (!ret && status)
410                 ret = -EINVAL;
411         if (ret) {
412                 pci_unmap_sg(dev->pdev, &db_tab->page[i].mem, 1, PCI_DMA_TODEVICE);
413                 put_page(db_tab->page[i].mem.page);
414                 goto out;
415         }
416
417         db_tab->page[i].uvirt    = uaddr;
418         db_tab->page[i].refcount = 1;
419
420 out:
421         up(&db_tab->mutex);
422         return ret;
423 }
424
425 void mthca_unmap_user_db(struct mthca_dev *dev, struct mthca_uar *uar,
426                          struct mthca_user_db_table *db_tab, int index)
427 {
428         if (!mthca_is_memfree(dev))
429                 return;
430
431         /*
432          * To make our bookkeeping simpler, we don't unmap DB
433          * pages until we clean up the whole db table.
434          */
435
436         down(&db_tab->mutex);
437
438         --db_tab->page[index / MTHCA_DB_REC_PER_PAGE].refcount;
439
440         up(&db_tab->mutex);
441 }
442
443 struct mthca_user_db_table *mthca_init_user_db_tab(struct mthca_dev *dev)
444 {
445         struct mthca_user_db_table *db_tab;
446         int npages;
447         int i;
448
449         if (!mthca_is_memfree(dev))
450                 return NULL;
451
452         npages = dev->uar_table.uarc_size / 4096;
453         db_tab = kmalloc(sizeof *db_tab + npages * sizeof *db_tab->page, GFP_KERNEL);
454         if (!db_tab)
455                 return ERR_PTR(-ENOMEM);
456
457         init_MUTEX(&db_tab->mutex);
458         for (i = 0; i < npages; ++i) {
459                 db_tab->page[i].refcount = 0;
460                 db_tab->page[i].uvirt    = 0;
461         }
462
463         return db_tab;
464 }
465
466 void mthca_cleanup_user_db_tab(struct mthca_dev *dev, struct mthca_uar *uar,
467                                struct mthca_user_db_table *db_tab)
468 {
469         int i;
470         u8 status;
471
472         if (!mthca_is_memfree(dev))
473                 return;
474
475         for (i = 0; i < dev->uar_table.uarc_size / 4096; ++i) {
476                 if (db_tab->page[i].uvirt) {
477                         mthca_UNMAP_ICM(dev, mthca_uarc_virt(dev, uar, i), 1, &status);
478                         pci_unmap_sg(dev->pdev, &db_tab->page[i].mem, 1, PCI_DMA_TODEVICE);
479                         put_page(db_tab->page[i].mem.page);
480                 }
481         }
482 }
483
484 int mthca_alloc_db(struct mthca_dev *dev, int type, u32 qn, u32 **db)
485 {
486         int group;
487         int start, end, dir;
488         int i, j;
489         struct mthca_db_page *page;
490         int ret = 0;
491         u8 status;
492
493         down(&dev->db_tab->mutex);
494
495         switch (type) {
496         case MTHCA_DB_TYPE_CQ_ARM:
497         case MTHCA_DB_TYPE_SQ:
498                 group = 0;
499                 start = 0;
500                 end   = dev->db_tab->max_group1;
501                 dir   = 1;
502                 break;
503
504         case MTHCA_DB_TYPE_CQ_SET_CI:
505         case MTHCA_DB_TYPE_RQ:
506         case MTHCA_DB_TYPE_SRQ:
507                 group = 1;
508                 start = dev->db_tab->npages - 1;
509                 end   = dev->db_tab->min_group2;
510                 dir   = -1;
511                 break;
512
513         default:
514                 ret = -EINVAL;
515                 goto out;
516         }
517
518         for (i = start; i != end; i += dir)
519                 if (dev->db_tab->page[i].db_rec &&
520                     !bitmap_full(dev->db_tab->page[i].used,
521                                  MTHCA_DB_REC_PER_PAGE)) {
522                         page = dev->db_tab->page + i;
523                         goto found;
524                 }
525
526         if (dev->db_tab->max_group1 >= dev->db_tab->min_group2 - 1) {
527                 ret = -ENOMEM;
528                 goto out;
529         }
530
531         page = dev->db_tab->page + end;
532         page->db_rec = dma_alloc_coherent(&dev->pdev->dev, 4096,
533                                           &page->mapping, GFP_KERNEL);
534         if (!page->db_rec) {
535                 ret = -ENOMEM;
536                 goto out;
537         }
538         memset(page->db_rec, 0, 4096);
539
540         ret = mthca_MAP_ICM_page(dev, page->mapping,
541                                  mthca_uarc_virt(dev, &dev->driver_uar, i), &status);
542         if (!ret && status)
543                 ret = -EINVAL;
544         if (ret) {
545                 dma_free_coherent(&dev->pdev->dev, 4096,
546                                   page->db_rec, page->mapping);
547                 goto out;
548         }
549
550         bitmap_zero(page->used, MTHCA_DB_REC_PER_PAGE);
551         if (group == 0)
552                 ++dev->db_tab->max_group1;
553         else
554                 --dev->db_tab->min_group2;
555
556 found:
557         j = find_first_zero_bit(page->used, MTHCA_DB_REC_PER_PAGE);
558         set_bit(j, page->used);
559
560         if (group == 1)
561                 j = MTHCA_DB_REC_PER_PAGE - 1 - j;
562
563         ret = i * MTHCA_DB_REC_PER_PAGE + j;
564
565         page->db_rec[j] = cpu_to_be64((qn << 8) | (type << 5));
566
567         *db = (u32 *) &page->db_rec[j];
568
569 out:
570         up(&dev->db_tab->mutex);
571
572         return ret;
573 }
574
575 void mthca_free_db(struct mthca_dev *dev, int type, int db_index)
576 {
577         int i, j;
578         struct mthca_db_page *page;
579         u8 status;
580
581         i = db_index / MTHCA_DB_REC_PER_PAGE;
582         j = db_index % MTHCA_DB_REC_PER_PAGE;
583
584         page = dev->db_tab->page + i;
585
586         down(&dev->db_tab->mutex);
587
588         page->db_rec[j] = 0;
589         if (i >= dev->db_tab->min_group2)
590                 j = MTHCA_DB_REC_PER_PAGE - 1 - j;
591         clear_bit(j, page->used);
592
593         if (bitmap_empty(page->used, MTHCA_DB_REC_PER_PAGE) &&
594             i >= dev->db_tab->max_group1 - 1) {
595                 mthca_UNMAP_ICM(dev, mthca_uarc_virt(dev, &dev->driver_uar, i), 1, &status);
596
597                 dma_free_coherent(&dev->pdev->dev, 4096,
598                                   page->db_rec, page->mapping);
599                 page->db_rec = NULL;
600
601                 if (i == dev->db_tab->max_group1) {
602                         --dev->db_tab->max_group1;
603                         /* XXX may be able to unmap more pages now */
604                 }
605                 if (i == dev->db_tab->min_group2)
606                         ++dev->db_tab->min_group2;
607         }
608
609         up(&dev->db_tab->mutex);
610 }
611
612 int mthca_init_db_tab(struct mthca_dev *dev)
613 {
614         int i;
615
616         if (!mthca_is_memfree(dev))
617                 return 0;
618
619         dev->db_tab = kmalloc(sizeof *dev->db_tab, GFP_KERNEL);
620         if (!dev->db_tab)
621                 return -ENOMEM;
622
623         init_MUTEX(&dev->db_tab->mutex);
624
625         dev->db_tab->npages     = dev->uar_table.uarc_size / 4096;
626         dev->db_tab->max_group1 = 0;
627         dev->db_tab->min_group2 = dev->db_tab->npages - 1;
628
629         dev->db_tab->page = kmalloc(dev->db_tab->npages *
630                                     sizeof *dev->db_tab->page,
631                                     GFP_KERNEL);
632         if (!dev->db_tab->page) {
633                 kfree(dev->db_tab);
634                 return -ENOMEM;
635         }
636
637         for (i = 0; i < dev->db_tab->npages; ++i)
638                 dev->db_tab->page[i].db_rec = NULL;
639
640         return 0;
641 }
642
643 void mthca_cleanup_db_tab(struct mthca_dev *dev)
644 {
645         int i;
646         u8 status;
647
648         if (!mthca_is_memfree(dev))
649                 return;
650
651         /*
652          * Because we don't always free our UARC pages when they
653          * become empty to make mthca_free_db() simpler we need to
654          * make a sweep through the doorbell pages and free any
655          * leftover pages now.
656          */
657         for (i = 0; i < dev->db_tab->npages; ++i) {
658                 if (!dev->db_tab->page[i].db_rec)
659                         continue;
660
661                 if (!bitmap_empty(dev->db_tab->page[i].used, MTHCA_DB_REC_PER_PAGE))
662                         mthca_warn(dev, "Kernel UARC page %d not empty\n", i);
663
664                 mthca_UNMAP_ICM(dev, mthca_uarc_virt(dev, &dev->driver_uar, i), 1, &status);
665
666                 dma_free_coherent(&dev->pdev->dev, 4096,
667                                   dev->db_tab->page[i].db_rec,
668                                   dev->db_tab->page[i].mapping);
669         }
670
671         kfree(dev->db_tab->page);
672         kfree(dev->db_tab);
673 }