Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Copyright (c) 2004, 2005 Topspin Communications. All rights reserved. | |
56483ec1 | 3 | * Copyright (c) 2005 Cisco Systems. All rights reserved. |
2a1d9b7f | 4 | * Copyright (c) 2005 Mellanox Technologies. All rights reserved. |
1da177e4 LT |
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 | ||
dbcf31ba RD |
37 | #include <linux/mm.h> |
38 | ||
1da177e4 LT |
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 | ||
56483ec1 RD |
52 | struct mthca_user_db_table { |
53 | struct semaphore mutex; | |
54 | struct { | |
55 | u64 uvirt; | |
56 | struct scatterlist mem; | |
57 | int refcount; | |
58 | } page[0]; | |
59 | }; | |
60 | ||
1da177e4 LT |
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 | unsigned int 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 | down(&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 | up(&table->mutex); | |
188 | return ret; | |
189 | } | |
190 | ||
191 | void mthca_table_put(struct mthca_dev *dev, struct mthca_icm_table *table, int obj) | |
192 | { | |
a03a5a67 | 193 | int i; |
1da177e4 LT |
194 | u8 status; |
195 | ||
a03a5a67 RD |
196 | if (!mthca_is_memfree(dev)) |
197 | return; | |
198 | ||
199 | i = (obj & (table->num_obj - 1)) * table->obj_size / MTHCA_TABLE_CHUNK_SIZE; | |
200 | ||
1da177e4 LT |
201 | down(&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 >> 12, &status); | |
206 | mthca_free_icm(dev, table->icm[i]); | |
207 | table->icm[i] = NULL; | |
208 | } | |
209 | ||
210 | up(&table->mutex); | |
211 | } | |
212 | ||
0fabd9fb MT |
213 | void *mthca_table_find(struct mthca_icm_table *table, int obj) |
214 | { | |
215 | int idx, offset, i; | |
216 | struct mthca_icm_chunk *chunk; | |
217 | struct mthca_icm *icm; | |
218 | struct page *page = NULL; | |
219 | ||
220 | if (!table->lowmem) | |
221 | return NULL; | |
222 | ||
223 | down(&table->mutex); | |
224 | ||
225 | idx = (obj & (table->num_obj - 1)) * table->obj_size; | |
226 | icm = table->icm[idx / MTHCA_TABLE_CHUNK_SIZE]; | |
227 | offset = idx % MTHCA_TABLE_CHUNK_SIZE; | |
228 | ||
229 | if (!icm) | |
230 | goto out; | |
231 | ||
232 | list_for_each_entry(chunk, &icm->chunk_list, list) { | |
233 | for (i = 0; i < chunk->npages; ++i) { | |
234 | if (chunk->mem[i].length >= offset) { | |
235 | page = chunk->mem[i].page; | |
236 | break; | |
237 | } | |
238 | offset -= chunk->mem[i].length; | |
239 | } | |
240 | } | |
241 | ||
242 | out: | |
243 | up(&table->mutex); | |
244 | return page ? lowmem_page_address(page) + offset : NULL; | |
245 | } | |
246 | ||
86562a13 RD |
247 | int mthca_table_get_range(struct mthca_dev *dev, struct mthca_icm_table *table, |
248 | int start, int end) | |
249 | { | |
250 | int inc = MTHCA_TABLE_CHUNK_SIZE / table->obj_size; | |
251 | int i, err; | |
252 | ||
253 | for (i = start; i <= end; i += inc) { | |
254 | err = mthca_table_get(dev, table, i); | |
255 | if (err) | |
256 | goto fail; | |
257 | } | |
258 | ||
259 | return 0; | |
260 | ||
261 | fail: | |
262 | while (i > start) { | |
263 | i -= inc; | |
264 | mthca_table_put(dev, table, i); | |
265 | } | |
266 | ||
267 | return err; | |
268 | } | |
269 | ||
270 | void mthca_table_put_range(struct mthca_dev *dev, struct mthca_icm_table *table, | |
271 | int start, int end) | |
272 | { | |
273 | int i; | |
274 | ||
a03a5a67 RD |
275 | if (!mthca_is_memfree(dev)) |
276 | return; | |
277 | ||
86562a13 RD |
278 | for (i = start; i <= end; i += MTHCA_TABLE_CHUNK_SIZE / table->obj_size) |
279 | mthca_table_put(dev, table, i); | |
280 | } | |
281 | ||
1da177e4 LT |
282 | struct mthca_icm_table *mthca_alloc_icm_table(struct mthca_dev *dev, |
283 | u64 virt, int obj_size, | |
284 | int nobj, int reserved, | |
285 | int use_lowmem) | |
286 | { | |
287 | struct mthca_icm_table *table; | |
288 | int num_icm; | |
289 | int i; | |
290 | u8 status; | |
291 | ||
292 | num_icm = obj_size * nobj / MTHCA_TABLE_CHUNK_SIZE; | |
293 | ||
294 | table = kmalloc(sizeof *table + num_icm * sizeof *table->icm, GFP_KERNEL); | |
295 | if (!table) | |
296 | return NULL; | |
297 | ||
298 | table->virt = virt; | |
299 | table->num_icm = num_icm; | |
300 | table->num_obj = nobj; | |
301 | table->obj_size = obj_size; | |
302 | table->lowmem = use_lowmem; | |
303 | init_MUTEX(&table->mutex); | |
304 | ||
305 | for (i = 0; i < num_icm; ++i) | |
306 | table->icm[i] = NULL; | |
307 | ||
308 | for (i = 0; i * MTHCA_TABLE_CHUNK_SIZE < reserved * obj_size; ++i) { | |
309 | table->icm[i] = mthca_alloc_icm(dev, MTHCA_TABLE_CHUNK_SIZE >> PAGE_SHIFT, | |
310 | (use_lowmem ? GFP_KERNEL : GFP_HIGHUSER) | | |
311 | __GFP_NOWARN); | |
312 | if (!table->icm[i]) | |
313 | goto err; | |
314 | if (mthca_MAP_ICM(dev, table->icm[i], virt + i * MTHCA_TABLE_CHUNK_SIZE, | |
315 | &status) || status) { | |
316 | mthca_free_icm(dev, table->icm[i]); | |
317 | table->icm[i] = NULL; | |
318 | goto err; | |
319 | } | |
320 | ||
321 | /* | |
322 | * Add a reference to this ICM chunk so that it never | |
323 | * gets freed (since it contains reserved firmware objects). | |
324 | */ | |
325 | ++table->icm[i]->refcount; | |
326 | } | |
327 | ||
328 | return table; | |
329 | ||
330 | err: | |
331 | for (i = 0; i < num_icm; ++i) | |
332 | if (table->icm[i]) { | |
333 | mthca_UNMAP_ICM(dev, virt + i * MTHCA_TABLE_CHUNK_SIZE, | |
334 | MTHCA_TABLE_CHUNK_SIZE >> 12, &status); | |
335 | mthca_free_icm(dev, table->icm[i]); | |
336 | } | |
337 | ||
338 | kfree(table); | |
339 | ||
340 | return NULL; | |
341 | } | |
342 | ||
343 | void mthca_free_icm_table(struct mthca_dev *dev, struct mthca_icm_table *table) | |
344 | { | |
345 | int i; | |
346 | u8 status; | |
347 | ||
348 | for (i = 0; i < table->num_icm; ++i) | |
349 | if (table->icm[i]) { | |
350 | mthca_UNMAP_ICM(dev, table->virt + i * MTHCA_TABLE_CHUNK_SIZE, | |
351 | MTHCA_TABLE_CHUNK_SIZE >> 12, &status); | |
352 | mthca_free_icm(dev, table->icm[i]); | |
353 | } | |
354 | ||
355 | kfree(table); | |
356 | } | |
357 | ||
56483ec1 | 358 | static u64 mthca_uarc_virt(struct mthca_dev *dev, struct mthca_uar *uar, int page) |
1da177e4 LT |
359 | { |
360 | return dev->uar_table.uarc_base + | |
56483ec1 | 361 | uar->index * dev->uar_table.uarc_size + |
1da177e4 LT |
362 | page * 4096; |
363 | } | |
364 | ||
56483ec1 RD |
365 | int mthca_map_user_db(struct mthca_dev *dev, struct mthca_uar *uar, |
366 | struct mthca_user_db_table *db_tab, int index, u64 uaddr) | |
367 | { | |
368 | int ret = 0; | |
369 | u8 status; | |
370 | int i; | |
371 | ||
372 | if (!mthca_is_memfree(dev)) | |
373 | return 0; | |
374 | ||
375 | if (index < 0 || index > dev->uar_table.uarc_size / 8) | |
376 | return -EINVAL; | |
377 | ||
378 | down(&db_tab->mutex); | |
379 | ||
380 | i = index / MTHCA_DB_REC_PER_PAGE; | |
381 | ||
382 | if ((db_tab->page[i].refcount >= MTHCA_DB_REC_PER_PAGE) || | |
383 | (db_tab->page[i].uvirt && db_tab->page[i].uvirt != uaddr) || | |
384 | (uaddr & 4095)) { | |
385 | ret = -EINVAL; | |
386 | goto out; | |
387 | } | |
388 | ||
389 | if (db_tab->page[i].refcount) { | |
390 | ++db_tab->page[i].refcount; | |
391 | goto out; | |
392 | } | |
393 | ||
394 | ret = get_user_pages(current, current->mm, uaddr & PAGE_MASK, 1, 1, 0, | |
395 | &db_tab->page[i].mem.page, NULL); | |
396 | if (ret < 0) | |
397 | goto out; | |
398 | ||
399 | db_tab->page[i].mem.length = 4096; | |
400 | db_tab->page[i].mem.offset = uaddr & ~PAGE_MASK; | |
401 | ||
402 | ret = pci_map_sg(dev->pdev, &db_tab->page[i].mem, 1, PCI_DMA_TODEVICE); | |
403 | if (ret < 0) { | |
404 | put_page(db_tab->page[i].mem.page); | |
405 | goto out; | |
406 | } | |
407 | ||
408 | ret = mthca_MAP_ICM_page(dev, sg_dma_address(&db_tab->page[i].mem), | |
409 | mthca_uarc_virt(dev, uar, i), &status); | |
410 | if (!ret && status) | |
411 | ret = -EINVAL; | |
412 | if (ret) { | |
413 | pci_unmap_sg(dev->pdev, &db_tab->page[i].mem, 1, PCI_DMA_TODEVICE); | |
414 | put_page(db_tab->page[i].mem.page); | |
415 | goto out; | |
416 | } | |
417 | ||
418 | db_tab->page[i].uvirt = uaddr; | |
419 | db_tab->page[i].refcount = 1; | |
420 | ||
421 | out: | |
422 | up(&db_tab->mutex); | |
423 | return ret; | |
424 | } | |
425 | ||
426 | void mthca_unmap_user_db(struct mthca_dev *dev, struct mthca_uar *uar, | |
427 | struct mthca_user_db_table *db_tab, int index) | |
428 | { | |
429 | if (!mthca_is_memfree(dev)) | |
430 | return; | |
431 | ||
432 | /* | |
433 | * To make our bookkeeping simpler, we don't unmap DB | |
434 | * pages until we clean up the whole db table. | |
435 | */ | |
436 | ||
437 | down(&db_tab->mutex); | |
438 | ||
439 | --db_tab->page[index / MTHCA_DB_REC_PER_PAGE].refcount; | |
440 | ||
441 | up(&db_tab->mutex); | |
442 | } | |
443 | ||
444 | struct mthca_user_db_table *mthca_init_user_db_tab(struct mthca_dev *dev) | |
445 | { | |
446 | struct mthca_user_db_table *db_tab; | |
447 | int npages; | |
448 | int i; | |
449 | ||
450 | if (!mthca_is_memfree(dev)) | |
451 | return NULL; | |
452 | ||
453 | npages = dev->uar_table.uarc_size / 4096; | |
454 | db_tab = kmalloc(sizeof *db_tab + npages * sizeof *db_tab->page, GFP_KERNEL); | |
455 | if (!db_tab) | |
456 | return ERR_PTR(-ENOMEM); | |
457 | ||
458 | init_MUTEX(&db_tab->mutex); | |
459 | for (i = 0; i < npages; ++i) { | |
460 | db_tab->page[i].refcount = 0; | |
461 | db_tab->page[i].uvirt = 0; | |
462 | } | |
463 | ||
464 | return db_tab; | |
465 | } | |
466 | ||
467 | void mthca_cleanup_user_db_tab(struct mthca_dev *dev, struct mthca_uar *uar, | |
468 | struct mthca_user_db_table *db_tab) | |
469 | { | |
470 | int i; | |
471 | u8 status; | |
472 | ||
473 | if (!mthca_is_memfree(dev)) | |
474 | return; | |
475 | ||
476 | for (i = 0; i < dev->uar_table.uarc_size / 4096; ++i) { | |
477 | if (db_tab->page[i].uvirt) { | |
478 | mthca_UNMAP_ICM(dev, mthca_uarc_virt(dev, uar, i), 1, &status); | |
479 | pci_unmap_sg(dev->pdev, &db_tab->page[i].mem, 1, PCI_DMA_TODEVICE); | |
480 | put_page(db_tab->page[i].mem.page); | |
481 | } | |
482 | } | |
483 | } | |
484 | ||
1da177e4 LT |
485 | int mthca_alloc_db(struct mthca_dev *dev, int type, u32 qn, u32 **db) |
486 | { | |
487 | int group; | |
488 | int start, end, dir; | |
489 | int i, j; | |
490 | struct mthca_db_page *page; | |
491 | int ret = 0; | |
492 | u8 status; | |
493 | ||
494 | down(&dev->db_tab->mutex); | |
495 | ||
496 | switch (type) { | |
497 | case MTHCA_DB_TYPE_CQ_ARM: | |
498 | case MTHCA_DB_TYPE_SQ: | |
499 | group = 0; | |
500 | start = 0; | |
501 | end = dev->db_tab->max_group1; | |
502 | dir = 1; | |
503 | break; | |
504 | ||
505 | case MTHCA_DB_TYPE_CQ_SET_CI: | |
506 | case MTHCA_DB_TYPE_RQ: | |
507 | case MTHCA_DB_TYPE_SRQ: | |
508 | group = 1; | |
509 | start = dev->db_tab->npages - 1; | |
510 | end = dev->db_tab->min_group2; | |
511 | dir = -1; | |
512 | break; | |
513 | ||
514 | default: | |
2714eb5a RD |
515 | ret = -EINVAL; |
516 | goto out; | |
1da177e4 LT |
517 | } |
518 | ||
519 | for (i = start; i != end; i += dir) | |
520 | if (dev->db_tab->page[i].db_rec && | |
521 | !bitmap_full(dev->db_tab->page[i].used, | |
522 | MTHCA_DB_REC_PER_PAGE)) { | |
523 | page = dev->db_tab->page + i; | |
524 | goto found; | |
525 | } | |
526 | ||
527 | if (dev->db_tab->max_group1 >= dev->db_tab->min_group2 - 1) { | |
528 | ret = -ENOMEM; | |
529 | goto out; | |
530 | } | |
531 | ||
532 | page = dev->db_tab->page + end; | |
533 | page->db_rec = dma_alloc_coherent(&dev->pdev->dev, 4096, | |
534 | &page->mapping, GFP_KERNEL); | |
535 | if (!page->db_rec) { | |
536 | ret = -ENOMEM; | |
537 | goto out; | |
538 | } | |
539 | memset(page->db_rec, 0, 4096); | |
540 | ||
56483ec1 RD |
541 | ret = mthca_MAP_ICM_page(dev, page->mapping, |
542 | mthca_uarc_virt(dev, &dev->driver_uar, i), &status); | |
1da177e4 LT |
543 | if (!ret && status) |
544 | ret = -EINVAL; | |
545 | if (ret) { | |
546 | dma_free_coherent(&dev->pdev->dev, 4096, | |
547 | page->db_rec, page->mapping); | |
548 | goto out; | |
549 | } | |
550 | ||
551 | bitmap_zero(page->used, MTHCA_DB_REC_PER_PAGE); | |
552 | if (group == 0) | |
553 | ++dev->db_tab->max_group1; | |
554 | else | |
555 | --dev->db_tab->min_group2; | |
556 | ||
557 | found: | |
558 | j = find_first_zero_bit(page->used, MTHCA_DB_REC_PER_PAGE); | |
559 | set_bit(j, page->used); | |
560 | ||
561 | if (group == 1) | |
562 | j = MTHCA_DB_REC_PER_PAGE - 1 - j; | |
563 | ||
564 | ret = i * MTHCA_DB_REC_PER_PAGE + j; | |
565 | ||
566 | page->db_rec[j] = cpu_to_be64((qn << 8) | (type << 5)); | |
567 | ||
568 | *db = (u32 *) &page->db_rec[j]; | |
569 | ||
570 | out: | |
571 | up(&dev->db_tab->mutex); | |
572 | ||
573 | return ret; | |
574 | } | |
575 | ||
576 | void mthca_free_db(struct mthca_dev *dev, int type, int db_index) | |
577 | { | |
578 | int i, j; | |
579 | struct mthca_db_page *page; | |
580 | u8 status; | |
581 | ||
582 | i = db_index / MTHCA_DB_REC_PER_PAGE; | |
583 | j = db_index % MTHCA_DB_REC_PER_PAGE; | |
584 | ||
585 | page = dev->db_tab->page + i; | |
586 | ||
587 | down(&dev->db_tab->mutex); | |
588 | ||
589 | page->db_rec[j] = 0; | |
590 | if (i >= dev->db_tab->min_group2) | |
591 | j = MTHCA_DB_REC_PER_PAGE - 1 - j; | |
592 | clear_bit(j, page->used); | |
593 | ||
594 | if (bitmap_empty(page->used, MTHCA_DB_REC_PER_PAGE) && | |
595 | i >= dev->db_tab->max_group1 - 1) { | |
56483ec1 | 596 | mthca_UNMAP_ICM(dev, mthca_uarc_virt(dev, &dev->driver_uar, i), 1, &status); |
1da177e4 LT |
597 | |
598 | dma_free_coherent(&dev->pdev->dev, 4096, | |
599 | page->db_rec, page->mapping); | |
600 | page->db_rec = NULL; | |
601 | ||
602 | if (i == dev->db_tab->max_group1) { | |
603 | --dev->db_tab->max_group1; | |
604 | /* XXX may be able to unmap more pages now */ | |
605 | } | |
606 | if (i == dev->db_tab->min_group2) | |
607 | ++dev->db_tab->min_group2; | |
608 | } | |
609 | ||
610 | up(&dev->db_tab->mutex); | |
611 | } | |
612 | ||
613 | int mthca_init_db_tab(struct mthca_dev *dev) | |
614 | { | |
615 | int i; | |
616 | ||
d10ddbf6 | 617 | if (!mthca_is_memfree(dev)) |
1da177e4 LT |
618 | return 0; |
619 | ||
620 | dev->db_tab = kmalloc(sizeof *dev->db_tab, GFP_KERNEL); | |
621 | if (!dev->db_tab) | |
622 | return -ENOMEM; | |
623 | ||
624 | init_MUTEX(&dev->db_tab->mutex); | |
625 | ||
85665c98 | 626 | dev->db_tab->npages = dev->uar_table.uarc_size / 4096; |
1da177e4 LT |
627 | dev->db_tab->max_group1 = 0; |
628 | dev->db_tab->min_group2 = dev->db_tab->npages - 1; | |
629 | ||
630 | dev->db_tab->page = kmalloc(dev->db_tab->npages * | |
631 | sizeof *dev->db_tab->page, | |
632 | GFP_KERNEL); | |
633 | if (!dev->db_tab->page) { | |
634 | kfree(dev->db_tab); | |
635 | return -ENOMEM; | |
636 | } | |
637 | ||
638 | for (i = 0; i < dev->db_tab->npages; ++i) | |
639 | dev->db_tab->page[i].db_rec = NULL; | |
640 | ||
641 | return 0; | |
642 | } | |
643 | ||
644 | void mthca_cleanup_db_tab(struct mthca_dev *dev) | |
645 | { | |
646 | int i; | |
647 | u8 status; | |
648 | ||
d10ddbf6 | 649 | if (!mthca_is_memfree(dev)) |
1da177e4 LT |
650 | return; |
651 | ||
652 | /* | |
653 | * Because we don't always free our UARC pages when they | |
654 | * become empty to make mthca_free_db() simpler we need to | |
655 | * make a sweep through the doorbell pages and free any | |
656 | * leftover pages now. | |
657 | */ | |
658 | for (i = 0; i < dev->db_tab->npages; ++i) { | |
659 | if (!dev->db_tab->page[i].db_rec) | |
660 | continue; | |
661 | ||
662 | if (!bitmap_empty(dev->db_tab->page[i].used, MTHCA_DB_REC_PER_PAGE)) | |
663 | mthca_warn(dev, "Kernel UARC page %d not empty\n", i); | |
664 | ||
56483ec1 | 665 | mthca_UNMAP_ICM(dev, mthca_uarc_virt(dev, &dev->driver_uar, i), 1, &status); |
1da177e4 LT |
666 | |
667 | dma_free_coherent(&dev->pdev->dev, 4096, | |
668 | dev->db_tab->page[i].db_rec, | |
669 | dev->db_tab->page[i].mapping); | |
670 | } | |
671 | ||
672 | kfree(dev->db_tab->page); | |
673 | kfree(dev->db_tab); | |
674 | } |