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08b48a1e AG |
1 | /* |
2 | * Copyright (c) 2006 Oracle. All rights reserved. | |
3 | * | |
4 | * This software is available to you under a choice of one of two | |
5 | * licenses. You may choose to be licensed under the terms of the GNU | |
6 | * General Public License (GPL) Version 2, available from the file | |
7 | * COPYING in the main directory of this source tree, or the | |
8 | * OpenIB.org BSD license below: | |
9 | * | |
10 | * Redistribution and use in source and binary forms, with or | |
11 | * without modification, are permitted provided that the following | |
12 | * conditions are met: | |
13 | * | |
14 | * - Redistributions of source code must retain the above | |
15 | * copyright notice, this list of conditions and the following | |
16 | * disclaimer. | |
17 | * | |
18 | * - Redistributions in binary form must reproduce the above | |
19 | * copyright notice, this list of conditions and the following | |
20 | * disclaimer in the documentation and/or other materials | |
21 | * provided with the distribution. | |
22 | * | |
23 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
24 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
25 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
26 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
27 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
28 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
29 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
30 | * SOFTWARE. | |
31 | * | |
32 | */ | |
33 | #include <linux/kernel.h> | |
5a0e3ad6 | 34 | #include <linux/slab.h> |
08b48a1e AG |
35 | |
36 | #include "rds.h" | |
37 | #include "rdma.h" | |
38 | #include "ib.h" | |
39 | ||
40 | ||
41 | /* | |
42 | * This is stored as mr->r_trans_private. | |
43 | */ | |
44 | struct rds_ib_mr { | |
45 | struct rds_ib_device *device; | |
46 | struct rds_ib_mr_pool *pool; | |
47 | struct ib_fmr *fmr; | |
48 | struct list_head list; | |
49 | unsigned int remap_count; | |
50 | ||
51 | struct scatterlist *sg; | |
52 | unsigned int sg_len; | |
53 | u64 *dma; | |
54 | int sg_dma_len; | |
55 | }; | |
56 | ||
57 | /* | |
58 | * Our own little FMR pool | |
59 | */ | |
60 | struct rds_ib_mr_pool { | |
61 | struct mutex flush_lock; /* serialize fmr invalidate */ | |
62 | struct work_struct flush_worker; /* flush worker */ | |
63 | ||
64 | spinlock_t list_lock; /* protect variables below */ | |
65 | atomic_t item_count; /* total # of MRs */ | |
66 | atomic_t dirty_count; /* # dirty of MRs */ | |
67 | struct list_head drop_list; /* MRs that have reached their max_maps limit */ | |
68 | struct list_head free_list; /* unused MRs */ | |
69 | struct list_head clean_list; /* unused & unamapped MRs */ | |
70 | atomic_t free_pinned; /* memory pinned by free MRs */ | |
71 | unsigned long max_items; | |
72 | unsigned long max_items_soft; | |
73 | unsigned long max_free_pinned; | |
74 | struct ib_fmr_attr fmr_attr; | |
75 | }; | |
76 | ||
77 | static int rds_ib_flush_mr_pool(struct rds_ib_mr_pool *pool, int free_all); | |
78 | static void rds_ib_teardown_mr(struct rds_ib_mr *ibmr); | |
79 | static void rds_ib_mr_pool_flush_worker(struct work_struct *work); | |
80 | ||
81 | static struct rds_ib_device *rds_ib_get_device(__be32 ipaddr) | |
82 | { | |
83 | struct rds_ib_device *rds_ibdev; | |
84 | struct rds_ib_ipaddr *i_ipaddr; | |
85 | ||
86 | list_for_each_entry(rds_ibdev, &rds_ib_devices, list) { | |
87 | spin_lock_irq(&rds_ibdev->spinlock); | |
88 | list_for_each_entry(i_ipaddr, &rds_ibdev->ipaddr_list, list) { | |
89 | if (i_ipaddr->ipaddr == ipaddr) { | |
90 | spin_unlock_irq(&rds_ibdev->spinlock); | |
91 | return rds_ibdev; | |
92 | } | |
93 | } | |
94 | spin_unlock_irq(&rds_ibdev->spinlock); | |
95 | } | |
96 | ||
97 | return NULL; | |
98 | } | |
99 | ||
100 | static int rds_ib_add_ipaddr(struct rds_ib_device *rds_ibdev, __be32 ipaddr) | |
101 | { | |
102 | struct rds_ib_ipaddr *i_ipaddr; | |
103 | ||
104 | i_ipaddr = kmalloc(sizeof *i_ipaddr, GFP_KERNEL); | |
105 | if (!i_ipaddr) | |
106 | return -ENOMEM; | |
107 | ||
108 | i_ipaddr->ipaddr = ipaddr; | |
109 | ||
110 | spin_lock_irq(&rds_ibdev->spinlock); | |
111 | list_add_tail(&i_ipaddr->list, &rds_ibdev->ipaddr_list); | |
112 | spin_unlock_irq(&rds_ibdev->spinlock); | |
113 | ||
114 | return 0; | |
115 | } | |
116 | ||
117 | static void rds_ib_remove_ipaddr(struct rds_ib_device *rds_ibdev, __be32 ipaddr) | |
118 | { | |
119 | struct rds_ib_ipaddr *i_ipaddr, *next; | |
120 | ||
121 | spin_lock_irq(&rds_ibdev->spinlock); | |
122 | list_for_each_entry_safe(i_ipaddr, next, &rds_ibdev->ipaddr_list, list) { | |
123 | if (i_ipaddr->ipaddr == ipaddr) { | |
124 | list_del(&i_ipaddr->list); | |
125 | kfree(i_ipaddr); | |
126 | break; | |
127 | } | |
128 | } | |
129 | spin_unlock_irq(&rds_ibdev->spinlock); | |
130 | } | |
131 | ||
132 | int rds_ib_update_ipaddr(struct rds_ib_device *rds_ibdev, __be32 ipaddr) | |
133 | { | |
134 | struct rds_ib_device *rds_ibdev_old; | |
135 | ||
136 | rds_ibdev_old = rds_ib_get_device(ipaddr); | |
137 | if (rds_ibdev_old) | |
138 | rds_ib_remove_ipaddr(rds_ibdev_old, ipaddr); | |
139 | ||
140 | return rds_ib_add_ipaddr(rds_ibdev, ipaddr); | |
141 | } | |
142 | ||
745cbcca | 143 | void rds_ib_add_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn) |
08b48a1e AG |
144 | { |
145 | struct rds_ib_connection *ic = conn->c_transport_data; | |
146 | ||
147 | /* conn was previously on the nodev_conns_list */ | |
148 | spin_lock_irq(&ib_nodev_conns_lock); | |
149 | BUG_ON(list_empty(&ib_nodev_conns)); | |
150 | BUG_ON(list_empty(&ic->ib_node)); | |
151 | list_del(&ic->ib_node); | |
08b48a1e AG |
152 | |
153 | spin_lock_irq(&rds_ibdev->spinlock); | |
154 | list_add_tail(&ic->ib_node, &rds_ibdev->conn_list); | |
155 | spin_unlock_irq(&rds_ibdev->spinlock); | |
745cbcca | 156 | spin_unlock_irq(&ib_nodev_conns_lock); |
08b48a1e AG |
157 | |
158 | ic->rds_ibdev = rds_ibdev; | |
08b48a1e AG |
159 | } |
160 | ||
745cbcca | 161 | void rds_ib_remove_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn) |
08b48a1e | 162 | { |
745cbcca | 163 | struct rds_ib_connection *ic = conn->c_transport_data; |
08b48a1e | 164 | |
745cbcca AG |
165 | /* place conn on nodev_conns_list */ |
166 | spin_lock(&ib_nodev_conns_lock); | |
08b48a1e | 167 | |
745cbcca AG |
168 | spin_lock_irq(&rds_ibdev->spinlock); |
169 | BUG_ON(list_empty(&ic->ib_node)); | |
170 | list_del(&ic->ib_node); | |
171 | spin_unlock_irq(&rds_ibdev->spinlock); | |
172 | ||
173 | list_add_tail(&ic->ib_node, &ib_nodev_conns); | |
174 | ||
175 | spin_unlock(&ib_nodev_conns_lock); | |
176 | ||
177 | ic->rds_ibdev = NULL; | |
08b48a1e AG |
178 | } |
179 | ||
745cbcca | 180 | void __rds_ib_destroy_conns(struct list_head *list, spinlock_t *list_lock) |
08b48a1e AG |
181 | { |
182 | struct rds_ib_connection *ic, *_ic; | |
183 | LIST_HEAD(tmp_list); | |
184 | ||
185 | /* avoid calling conn_destroy with irqs off */ | |
745cbcca AG |
186 | spin_lock_irq(list_lock); |
187 | list_splice(list, &tmp_list); | |
188 | INIT_LIST_HEAD(list); | |
189 | spin_unlock_irq(list_lock); | |
08b48a1e | 190 | |
433d308d | 191 | list_for_each_entry_safe(ic, _ic, &tmp_list, ib_node) |
08b48a1e | 192 | rds_conn_destroy(ic->conn); |
08b48a1e AG |
193 | } |
194 | ||
195 | struct rds_ib_mr_pool *rds_ib_create_mr_pool(struct rds_ib_device *rds_ibdev) | |
196 | { | |
197 | struct rds_ib_mr_pool *pool; | |
198 | ||
199 | pool = kzalloc(sizeof(*pool), GFP_KERNEL); | |
200 | if (!pool) | |
201 | return ERR_PTR(-ENOMEM); | |
202 | ||
203 | INIT_LIST_HEAD(&pool->free_list); | |
204 | INIT_LIST_HEAD(&pool->drop_list); | |
205 | INIT_LIST_HEAD(&pool->clean_list); | |
206 | mutex_init(&pool->flush_lock); | |
207 | spin_lock_init(&pool->list_lock); | |
208 | INIT_WORK(&pool->flush_worker, rds_ib_mr_pool_flush_worker); | |
209 | ||
210 | pool->fmr_attr.max_pages = fmr_message_size; | |
211 | pool->fmr_attr.max_maps = rds_ibdev->fmr_max_remaps; | |
a870d627 | 212 | pool->fmr_attr.page_shift = PAGE_SHIFT; |
08b48a1e AG |
213 | pool->max_free_pinned = rds_ibdev->max_fmrs * fmr_message_size / 4; |
214 | ||
215 | /* We never allow more than max_items MRs to be allocated. | |
216 | * When we exceed more than max_items_soft, we start freeing | |
217 | * items more aggressively. | |
218 | * Make sure that max_items > max_items_soft > max_items / 2 | |
219 | */ | |
220 | pool->max_items_soft = rds_ibdev->max_fmrs * 3 / 4; | |
221 | pool->max_items = rds_ibdev->max_fmrs; | |
222 | ||
223 | return pool; | |
224 | } | |
225 | ||
226 | void rds_ib_get_mr_info(struct rds_ib_device *rds_ibdev, struct rds_info_rdma_connection *iinfo) | |
227 | { | |
228 | struct rds_ib_mr_pool *pool = rds_ibdev->mr_pool; | |
229 | ||
230 | iinfo->rdma_mr_max = pool->max_items; | |
231 | iinfo->rdma_mr_size = pool->fmr_attr.max_pages; | |
232 | } | |
233 | ||
234 | void rds_ib_destroy_mr_pool(struct rds_ib_mr_pool *pool) | |
235 | { | |
236 | flush_workqueue(rds_wq); | |
237 | rds_ib_flush_mr_pool(pool, 1); | |
571c02fa AG |
238 | WARN_ON(atomic_read(&pool->item_count)); |
239 | WARN_ON(atomic_read(&pool->free_pinned)); | |
08b48a1e AG |
240 | kfree(pool); |
241 | } | |
242 | ||
243 | static inline struct rds_ib_mr *rds_ib_reuse_fmr(struct rds_ib_mr_pool *pool) | |
244 | { | |
245 | struct rds_ib_mr *ibmr = NULL; | |
246 | unsigned long flags; | |
247 | ||
248 | spin_lock_irqsave(&pool->list_lock, flags); | |
249 | if (!list_empty(&pool->clean_list)) { | |
250 | ibmr = list_entry(pool->clean_list.next, struct rds_ib_mr, list); | |
251 | list_del_init(&ibmr->list); | |
252 | } | |
253 | spin_unlock_irqrestore(&pool->list_lock, flags); | |
254 | ||
255 | return ibmr; | |
256 | } | |
257 | ||
258 | static struct rds_ib_mr *rds_ib_alloc_fmr(struct rds_ib_device *rds_ibdev) | |
259 | { | |
260 | struct rds_ib_mr_pool *pool = rds_ibdev->mr_pool; | |
261 | struct rds_ib_mr *ibmr = NULL; | |
262 | int err = 0, iter = 0; | |
263 | ||
264 | while (1) { | |
265 | ibmr = rds_ib_reuse_fmr(pool); | |
266 | if (ibmr) | |
267 | return ibmr; | |
268 | ||
269 | /* No clean MRs - now we have the choice of either | |
270 | * allocating a fresh MR up to the limit imposed by the | |
271 | * driver, or flush any dirty unused MRs. | |
272 | * We try to avoid stalling in the send path if possible, | |
273 | * so we allocate as long as we're allowed to. | |
274 | * | |
275 | * We're fussy with enforcing the FMR limit, though. If the driver | |
276 | * tells us we can't use more than N fmrs, we shouldn't start | |
277 | * arguing with it */ | |
278 | if (atomic_inc_return(&pool->item_count) <= pool->max_items) | |
279 | break; | |
280 | ||
281 | atomic_dec(&pool->item_count); | |
282 | ||
283 | if (++iter > 2) { | |
284 | rds_ib_stats_inc(s_ib_rdma_mr_pool_depleted); | |
285 | return ERR_PTR(-EAGAIN); | |
286 | } | |
287 | ||
288 | /* We do have some empty MRs. Flush them out. */ | |
289 | rds_ib_stats_inc(s_ib_rdma_mr_pool_wait); | |
290 | rds_ib_flush_mr_pool(pool, 0); | |
291 | } | |
292 | ||
293 | ibmr = kzalloc(sizeof(*ibmr), GFP_KERNEL); | |
294 | if (!ibmr) { | |
295 | err = -ENOMEM; | |
296 | goto out_no_cigar; | |
297 | } | |
298 | ||
299 | ibmr->fmr = ib_alloc_fmr(rds_ibdev->pd, | |
300 | (IB_ACCESS_LOCAL_WRITE | | |
301 | IB_ACCESS_REMOTE_READ | | |
302 | IB_ACCESS_REMOTE_WRITE), | |
303 | &pool->fmr_attr); | |
304 | if (IS_ERR(ibmr->fmr)) { | |
305 | err = PTR_ERR(ibmr->fmr); | |
306 | ibmr->fmr = NULL; | |
307 | printk(KERN_WARNING "RDS/IB: ib_alloc_fmr failed (err=%d)\n", err); | |
308 | goto out_no_cigar; | |
309 | } | |
310 | ||
311 | rds_ib_stats_inc(s_ib_rdma_mr_alloc); | |
312 | return ibmr; | |
313 | ||
314 | out_no_cigar: | |
315 | if (ibmr) { | |
316 | if (ibmr->fmr) | |
317 | ib_dealloc_fmr(ibmr->fmr); | |
318 | kfree(ibmr); | |
319 | } | |
320 | atomic_dec(&pool->item_count); | |
321 | return ERR_PTR(err); | |
322 | } | |
323 | ||
324 | static int rds_ib_map_fmr(struct rds_ib_device *rds_ibdev, struct rds_ib_mr *ibmr, | |
325 | struct scatterlist *sg, unsigned int nents) | |
326 | { | |
327 | struct ib_device *dev = rds_ibdev->dev; | |
328 | struct scatterlist *scat = sg; | |
329 | u64 io_addr = 0; | |
330 | u64 *dma_pages; | |
331 | u32 len; | |
332 | int page_cnt, sg_dma_len; | |
333 | int i, j; | |
334 | int ret; | |
335 | ||
336 | sg_dma_len = ib_dma_map_sg(dev, sg, nents, | |
337 | DMA_BIDIRECTIONAL); | |
338 | if (unlikely(!sg_dma_len)) { | |
339 | printk(KERN_WARNING "RDS/IB: dma_map_sg failed!\n"); | |
340 | return -EBUSY; | |
341 | } | |
342 | ||
343 | len = 0; | |
344 | page_cnt = 0; | |
345 | ||
346 | for (i = 0; i < sg_dma_len; ++i) { | |
347 | unsigned int dma_len = ib_sg_dma_len(dev, &scat[i]); | |
348 | u64 dma_addr = ib_sg_dma_address(dev, &scat[i]); | |
349 | ||
a870d627 | 350 | if (dma_addr & ~PAGE_MASK) { |
08b48a1e AG |
351 | if (i > 0) |
352 | return -EINVAL; | |
353 | else | |
354 | ++page_cnt; | |
355 | } | |
a870d627 | 356 | if ((dma_addr + dma_len) & ~PAGE_MASK) { |
08b48a1e AG |
357 | if (i < sg_dma_len - 1) |
358 | return -EINVAL; | |
359 | else | |
360 | ++page_cnt; | |
361 | } | |
362 | ||
363 | len += dma_len; | |
364 | } | |
365 | ||
a870d627 | 366 | page_cnt += len >> PAGE_SHIFT; |
08b48a1e AG |
367 | if (page_cnt > fmr_message_size) |
368 | return -EINVAL; | |
369 | ||
370 | dma_pages = kmalloc(sizeof(u64) * page_cnt, GFP_ATOMIC); | |
371 | if (!dma_pages) | |
372 | return -ENOMEM; | |
373 | ||
374 | page_cnt = 0; | |
375 | for (i = 0; i < sg_dma_len; ++i) { | |
376 | unsigned int dma_len = ib_sg_dma_len(dev, &scat[i]); | |
377 | u64 dma_addr = ib_sg_dma_address(dev, &scat[i]); | |
378 | ||
a870d627 | 379 | for (j = 0; j < dma_len; j += PAGE_SIZE) |
08b48a1e | 380 | dma_pages[page_cnt++] = |
a870d627 | 381 | (dma_addr & PAGE_MASK) + j; |
08b48a1e AG |
382 | } |
383 | ||
384 | ret = ib_map_phys_fmr(ibmr->fmr, | |
385 | dma_pages, page_cnt, io_addr); | |
386 | if (ret) | |
387 | goto out; | |
388 | ||
389 | /* Success - we successfully remapped the MR, so we can | |
390 | * safely tear down the old mapping. */ | |
391 | rds_ib_teardown_mr(ibmr); | |
392 | ||
393 | ibmr->sg = scat; | |
394 | ibmr->sg_len = nents; | |
395 | ibmr->sg_dma_len = sg_dma_len; | |
396 | ibmr->remap_count++; | |
397 | ||
398 | rds_ib_stats_inc(s_ib_rdma_mr_used); | |
399 | ret = 0; | |
400 | ||
401 | out: | |
402 | kfree(dma_pages); | |
403 | ||
404 | return ret; | |
405 | } | |
406 | ||
407 | void rds_ib_sync_mr(void *trans_private, int direction) | |
408 | { | |
409 | struct rds_ib_mr *ibmr = trans_private; | |
410 | struct rds_ib_device *rds_ibdev = ibmr->device; | |
411 | ||
412 | switch (direction) { | |
413 | case DMA_FROM_DEVICE: | |
414 | ib_dma_sync_sg_for_cpu(rds_ibdev->dev, ibmr->sg, | |
415 | ibmr->sg_dma_len, DMA_BIDIRECTIONAL); | |
416 | break; | |
417 | case DMA_TO_DEVICE: | |
418 | ib_dma_sync_sg_for_device(rds_ibdev->dev, ibmr->sg, | |
419 | ibmr->sg_dma_len, DMA_BIDIRECTIONAL); | |
420 | break; | |
421 | } | |
422 | } | |
423 | ||
424 | static void __rds_ib_teardown_mr(struct rds_ib_mr *ibmr) | |
425 | { | |
426 | struct rds_ib_device *rds_ibdev = ibmr->device; | |
427 | ||
428 | if (ibmr->sg_dma_len) { | |
429 | ib_dma_unmap_sg(rds_ibdev->dev, | |
430 | ibmr->sg, ibmr->sg_len, | |
431 | DMA_BIDIRECTIONAL); | |
432 | ibmr->sg_dma_len = 0; | |
433 | } | |
434 | ||
435 | /* Release the s/g list */ | |
436 | if (ibmr->sg_len) { | |
437 | unsigned int i; | |
438 | ||
439 | for (i = 0; i < ibmr->sg_len; ++i) { | |
440 | struct page *page = sg_page(&ibmr->sg[i]); | |
441 | ||
442 | /* FIXME we need a way to tell a r/w MR | |
443 | * from a r/o MR */ | |
561c7df6 | 444 | BUG_ON(in_interrupt()); |
08b48a1e AG |
445 | set_page_dirty(page); |
446 | put_page(page); | |
447 | } | |
448 | kfree(ibmr->sg); | |
449 | ||
450 | ibmr->sg = NULL; | |
451 | ibmr->sg_len = 0; | |
452 | } | |
453 | } | |
454 | ||
455 | static void rds_ib_teardown_mr(struct rds_ib_mr *ibmr) | |
456 | { | |
457 | unsigned int pinned = ibmr->sg_len; | |
458 | ||
459 | __rds_ib_teardown_mr(ibmr); | |
460 | if (pinned) { | |
461 | struct rds_ib_device *rds_ibdev = ibmr->device; | |
462 | struct rds_ib_mr_pool *pool = rds_ibdev->mr_pool; | |
463 | ||
464 | atomic_sub(pinned, &pool->free_pinned); | |
465 | } | |
466 | } | |
467 | ||
468 | static inline unsigned int rds_ib_flush_goal(struct rds_ib_mr_pool *pool, int free_all) | |
469 | { | |
470 | unsigned int item_count; | |
471 | ||
472 | item_count = atomic_read(&pool->item_count); | |
473 | if (free_all) | |
474 | return item_count; | |
475 | ||
476 | return 0; | |
477 | } | |
478 | ||
479 | /* | |
480 | * Flush our pool of MRs. | |
481 | * At a minimum, all currently unused MRs are unmapped. | |
482 | * If the number of MRs allocated exceeds the limit, we also try | |
483 | * to free as many MRs as needed to get back to this limit. | |
484 | */ | |
485 | static int rds_ib_flush_mr_pool(struct rds_ib_mr_pool *pool, int free_all) | |
486 | { | |
487 | struct rds_ib_mr *ibmr, *next; | |
488 | LIST_HEAD(unmap_list); | |
489 | LIST_HEAD(fmr_list); | |
490 | unsigned long unpinned = 0; | |
491 | unsigned long flags; | |
492 | unsigned int nfreed = 0, ncleaned = 0, free_goal; | |
493 | int ret = 0; | |
494 | ||
495 | rds_ib_stats_inc(s_ib_rdma_mr_pool_flush); | |
496 | ||
497 | mutex_lock(&pool->flush_lock); | |
498 | ||
499 | spin_lock_irqsave(&pool->list_lock, flags); | |
500 | /* Get the list of all MRs to be dropped. Ordering matters - | |
501 | * we want to put drop_list ahead of free_list. */ | |
502 | list_splice_init(&pool->free_list, &unmap_list); | |
503 | list_splice_init(&pool->drop_list, &unmap_list); | |
504 | if (free_all) | |
505 | list_splice_init(&pool->clean_list, &unmap_list); | |
506 | spin_unlock_irqrestore(&pool->list_lock, flags); | |
507 | ||
508 | free_goal = rds_ib_flush_goal(pool, free_all); | |
509 | ||
510 | if (list_empty(&unmap_list)) | |
511 | goto out; | |
512 | ||
513 | /* String all ib_mr's onto one list and hand them to ib_unmap_fmr */ | |
514 | list_for_each_entry(ibmr, &unmap_list, list) | |
515 | list_add(&ibmr->fmr->list, &fmr_list); | |
516 | ret = ib_unmap_fmr(&fmr_list); | |
517 | if (ret) | |
518 | printk(KERN_WARNING "RDS/IB: ib_unmap_fmr failed (err=%d)\n", ret); | |
519 | ||
520 | /* Now we can destroy the DMA mapping and unpin any pages */ | |
521 | list_for_each_entry_safe(ibmr, next, &unmap_list, list) { | |
522 | unpinned += ibmr->sg_len; | |
523 | __rds_ib_teardown_mr(ibmr); | |
524 | if (nfreed < free_goal || ibmr->remap_count >= pool->fmr_attr.max_maps) { | |
525 | rds_ib_stats_inc(s_ib_rdma_mr_free); | |
526 | list_del(&ibmr->list); | |
527 | ib_dealloc_fmr(ibmr->fmr); | |
528 | kfree(ibmr); | |
529 | nfreed++; | |
530 | } | |
531 | ncleaned++; | |
532 | } | |
533 | ||
534 | spin_lock_irqsave(&pool->list_lock, flags); | |
535 | list_splice(&unmap_list, &pool->clean_list); | |
536 | spin_unlock_irqrestore(&pool->list_lock, flags); | |
537 | ||
538 | atomic_sub(unpinned, &pool->free_pinned); | |
539 | atomic_sub(ncleaned, &pool->dirty_count); | |
540 | atomic_sub(nfreed, &pool->item_count); | |
541 | ||
542 | out: | |
543 | mutex_unlock(&pool->flush_lock); | |
544 | return ret; | |
545 | } | |
546 | ||
547 | static void rds_ib_mr_pool_flush_worker(struct work_struct *work) | |
548 | { | |
549 | struct rds_ib_mr_pool *pool = container_of(work, struct rds_ib_mr_pool, flush_worker); | |
550 | ||
551 | rds_ib_flush_mr_pool(pool, 0); | |
552 | } | |
553 | ||
554 | void rds_ib_free_mr(void *trans_private, int invalidate) | |
555 | { | |
556 | struct rds_ib_mr *ibmr = trans_private; | |
557 | struct rds_ib_device *rds_ibdev = ibmr->device; | |
558 | struct rds_ib_mr_pool *pool = rds_ibdev->mr_pool; | |
559 | unsigned long flags; | |
560 | ||
561 | rdsdebug("RDS/IB: free_mr nents %u\n", ibmr->sg_len); | |
562 | ||
563 | /* Return it to the pool's free list */ | |
564 | spin_lock_irqsave(&pool->list_lock, flags); | |
565 | if (ibmr->remap_count >= pool->fmr_attr.max_maps) | |
566 | list_add(&ibmr->list, &pool->drop_list); | |
567 | else | |
568 | list_add(&ibmr->list, &pool->free_list); | |
569 | ||
570 | atomic_add(ibmr->sg_len, &pool->free_pinned); | |
571 | atomic_inc(&pool->dirty_count); | |
572 | spin_unlock_irqrestore(&pool->list_lock, flags); | |
573 | ||
574 | /* If we've pinned too many pages, request a flush */ | |
f64f9e71 JP |
575 | if (atomic_read(&pool->free_pinned) >= pool->max_free_pinned || |
576 | atomic_read(&pool->dirty_count) >= pool->max_items / 10) | |
08b48a1e AG |
577 | queue_work(rds_wq, &pool->flush_worker); |
578 | ||
579 | if (invalidate) { | |
580 | if (likely(!in_interrupt())) { | |
581 | rds_ib_flush_mr_pool(pool, 0); | |
582 | } else { | |
583 | /* We get here if the user created a MR marked | |
584 | * as use_once and invalidate at the same time. */ | |
585 | queue_work(rds_wq, &pool->flush_worker); | |
586 | } | |
587 | } | |
588 | } | |
589 | ||
590 | void rds_ib_flush_mrs(void) | |
591 | { | |
592 | struct rds_ib_device *rds_ibdev; | |
593 | ||
594 | list_for_each_entry(rds_ibdev, &rds_ib_devices, list) { | |
595 | struct rds_ib_mr_pool *pool = rds_ibdev->mr_pool; | |
596 | ||
597 | if (pool) | |
598 | rds_ib_flush_mr_pool(pool, 0); | |
599 | } | |
600 | } | |
601 | ||
602 | void *rds_ib_get_mr(struct scatterlist *sg, unsigned long nents, | |
603 | struct rds_sock *rs, u32 *key_ret) | |
604 | { | |
605 | struct rds_ib_device *rds_ibdev; | |
606 | struct rds_ib_mr *ibmr = NULL; | |
607 | int ret; | |
608 | ||
609 | rds_ibdev = rds_ib_get_device(rs->rs_bound_addr); | |
610 | if (!rds_ibdev) { | |
611 | ret = -ENODEV; | |
612 | goto out; | |
613 | } | |
614 | ||
615 | if (!rds_ibdev->mr_pool) { | |
616 | ret = -ENODEV; | |
617 | goto out; | |
618 | } | |
619 | ||
620 | ibmr = rds_ib_alloc_fmr(rds_ibdev); | |
621 | if (IS_ERR(ibmr)) | |
622 | return ibmr; | |
623 | ||
624 | ret = rds_ib_map_fmr(rds_ibdev, ibmr, sg, nents); | |
625 | if (ret == 0) | |
626 | *key_ret = ibmr->fmr->rkey; | |
627 | else | |
628 | printk(KERN_WARNING "RDS/IB: map_fmr failed (errno=%d)\n", ret); | |
629 | ||
630 | ibmr->device = rds_ibdev; | |
631 | ||
632 | out: | |
633 | if (ret) { | |
634 | if (ibmr) | |
635 | rds_ib_free_mr(ibmr, 0); | |
636 | ibmr = ERR_PTR(ret); | |
637 | } | |
638 | return ibmr; | |
639 | } |