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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> |
764f2dd9 | 35 | #include <linux/rculist.h> |
08b48a1e AG |
36 | |
37 | #include "rds.h" | |
08b48a1e | 38 | #include "ib.h" |
6fa70da6 | 39 | #include "xlist.h" |
08b48a1e | 40 | |
ff51bf84 | 41 | static struct workqueue_struct *rds_ib_fmr_wq; |
8576f374 | 42 | |
6fa70da6 CM |
43 | static DEFINE_PER_CPU(unsigned long, clean_list_grace); |
44 | #define CLEAN_LIST_BUSY_BIT 0 | |
08b48a1e AG |
45 | |
46 | /* | |
47 | * This is stored as mr->r_trans_private. | |
48 | */ | |
49 | struct rds_ib_mr { | |
50 | struct rds_ib_device *device; | |
51 | struct rds_ib_mr_pool *pool; | |
52 | struct ib_fmr *fmr; | |
6fa70da6 CM |
53 | |
54 | struct xlist_head xlist; | |
55 | ||
56 | /* unmap_list is for freeing */ | |
57 | struct list_head unmap_list; | |
08b48a1e AG |
58 | unsigned int remap_count; |
59 | ||
60 | struct scatterlist *sg; | |
61 | unsigned int sg_len; | |
62 | u64 *dma; | |
63 | int sg_dma_len; | |
64 | }; | |
65 | ||
66 | /* | |
67 | * Our own little FMR pool | |
68 | */ | |
69 | struct rds_ib_mr_pool { | |
70 | struct mutex flush_lock; /* serialize fmr invalidate */ | |
7a0ff5db | 71 | struct delayed_work flush_worker; /* flush worker */ |
08b48a1e | 72 | |
08b48a1e AG |
73 | atomic_t item_count; /* total # of MRs */ |
74 | atomic_t dirty_count; /* # dirty of MRs */ | |
6fa70da6 CM |
75 | |
76 | struct xlist_head drop_list; /* MRs that have reached their max_maps limit */ | |
77 | struct xlist_head free_list; /* unused MRs */ | |
78 | struct xlist_head clean_list; /* global unused & unamapped MRs */ | |
79 | wait_queue_head_t flush_wait; | |
80 | ||
08b48a1e AG |
81 | atomic_t free_pinned; /* memory pinned by free MRs */ |
82 | unsigned long max_items; | |
83 | unsigned long max_items_soft; | |
84 | unsigned long max_free_pinned; | |
85 | struct ib_fmr_attr fmr_attr; | |
86 | }; | |
87 | ||
6fa70da6 | 88 | static int rds_ib_flush_mr_pool(struct rds_ib_mr_pool *pool, int free_all, struct rds_ib_mr **); |
08b48a1e AG |
89 | static void rds_ib_teardown_mr(struct rds_ib_mr *ibmr); |
90 | static void rds_ib_mr_pool_flush_worker(struct work_struct *work); | |
91 | ||
92 | static struct rds_ib_device *rds_ib_get_device(__be32 ipaddr) | |
93 | { | |
94 | struct rds_ib_device *rds_ibdev; | |
95 | struct rds_ib_ipaddr *i_ipaddr; | |
96 | ||
ea819867 ZB |
97 | rcu_read_lock(); |
98 | list_for_each_entry_rcu(rds_ibdev, &rds_ib_devices, list) { | |
764f2dd9 | 99 | list_for_each_entry_rcu(i_ipaddr, &rds_ibdev->ipaddr_list, list) { |
08b48a1e | 100 | if (i_ipaddr->ipaddr == ipaddr) { |
3e0249f9 | 101 | atomic_inc(&rds_ibdev->refcount); |
764f2dd9 | 102 | rcu_read_unlock(); |
08b48a1e AG |
103 | return rds_ibdev; |
104 | } | |
105 | } | |
08b48a1e | 106 | } |
ea819867 | 107 | rcu_read_unlock(); |
08b48a1e AG |
108 | |
109 | return NULL; | |
110 | } | |
111 | ||
112 | static int rds_ib_add_ipaddr(struct rds_ib_device *rds_ibdev, __be32 ipaddr) | |
113 | { | |
114 | struct rds_ib_ipaddr *i_ipaddr; | |
115 | ||
116 | i_ipaddr = kmalloc(sizeof *i_ipaddr, GFP_KERNEL); | |
117 | if (!i_ipaddr) | |
118 | return -ENOMEM; | |
119 | ||
120 | i_ipaddr->ipaddr = ipaddr; | |
121 | ||
122 | spin_lock_irq(&rds_ibdev->spinlock); | |
764f2dd9 | 123 | list_add_tail_rcu(&i_ipaddr->list, &rds_ibdev->ipaddr_list); |
08b48a1e AG |
124 | spin_unlock_irq(&rds_ibdev->spinlock); |
125 | ||
126 | return 0; | |
127 | } | |
128 | ||
129 | static void rds_ib_remove_ipaddr(struct rds_ib_device *rds_ibdev, __be32 ipaddr) | |
130 | { | |
4a81802b | 131 | struct rds_ib_ipaddr *i_ipaddr; |
764f2dd9 CM |
132 | struct rds_ib_ipaddr *to_free = NULL; |
133 | ||
08b48a1e AG |
134 | |
135 | spin_lock_irq(&rds_ibdev->spinlock); | |
764f2dd9 | 136 | list_for_each_entry_rcu(i_ipaddr, &rds_ibdev->ipaddr_list, list) { |
08b48a1e | 137 | if (i_ipaddr->ipaddr == ipaddr) { |
764f2dd9 CM |
138 | list_del_rcu(&i_ipaddr->list); |
139 | to_free = i_ipaddr; | |
08b48a1e AG |
140 | break; |
141 | } | |
142 | } | |
143 | spin_unlock_irq(&rds_ibdev->spinlock); | |
764f2dd9 CM |
144 | |
145 | if (to_free) { | |
146 | synchronize_rcu(); | |
147 | kfree(to_free); | |
148 | } | |
08b48a1e AG |
149 | } |
150 | ||
151 | int rds_ib_update_ipaddr(struct rds_ib_device *rds_ibdev, __be32 ipaddr) | |
152 | { | |
153 | struct rds_ib_device *rds_ibdev_old; | |
154 | ||
155 | rds_ibdev_old = rds_ib_get_device(ipaddr); | |
3e0249f9 | 156 | if (rds_ibdev_old) { |
08b48a1e | 157 | rds_ib_remove_ipaddr(rds_ibdev_old, ipaddr); |
3e0249f9 ZB |
158 | rds_ib_dev_put(rds_ibdev_old); |
159 | } | |
08b48a1e AG |
160 | |
161 | return rds_ib_add_ipaddr(rds_ibdev, ipaddr); | |
162 | } | |
163 | ||
745cbcca | 164 | void rds_ib_add_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn) |
08b48a1e AG |
165 | { |
166 | struct rds_ib_connection *ic = conn->c_transport_data; | |
167 | ||
168 | /* conn was previously on the nodev_conns_list */ | |
169 | spin_lock_irq(&ib_nodev_conns_lock); | |
170 | BUG_ON(list_empty(&ib_nodev_conns)); | |
171 | BUG_ON(list_empty(&ic->ib_node)); | |
172 | list_del(&ic->ib_node); | |
08b48a1e | 173 | |
aef3ea33 | 174 | spin_lock(&rds_ibdev->spinlock); |
08b48a1e | 175 | list_add_tail(&ic->ib_node, &rds_ibdev->conn_list); |
aef3ea33 | 176 | spin_unlock(&rds_ibdev->spinlock); |
745cbcca | 177 | spin_unlock_irq(&ib_nodev_conns_lock); |
08b48a1e AG |
178 | |
179 | ic->rds_ibdev = rds_ibdev; | |
3e0249f9 | 180 | atomic_inc(&rds_ibdev->refcount); |
08b48a1e AG |
181 | } |
182 | ||
745cbcca | 183 | void rds_ib_remove_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn) |
08b48a1e | 184 | { |
745cbcca | 185 | struct rds_ib_connection *ic = conn->c_transport_data; |
08b48a1e | 186 | |
745cbcca AG |
187 | /* place conn on nodev_conns_list */ |
188 | spin_lock(&ib_nodev_conns_lock); | |
08b48a1e | 189 | |
745cbcca AG |
190 | spin_lock_irq(&rds_ibdev->spinlock); |
191 | BUG_ON(list_empty(&ic->ib_node)); | |
192 | list_del(&ic->ib_node); | |
193 | spin_unlock_irq(&rds_ibdev->spinlock); | |
194 | ||
195 | list_add_tail(&ic->ib_node, &ib_nodev_conns); | |
196 | ||
197 | spin_unlock(&ib_nodev_conns_lock); | |
198 | ||
199 | ic->rds_ibdev = NULL; | |
3e0249f9 | 200 | rds_ib_dev_put(rds_ibdev); |
08b48a1e AG |
201 | } |
202 | ||
8aeb1ba6 | 203 | void rds_ib_destroy_nodev_conns(void) |
08b48a1e AG |
204 | { |
205 | struct rds_ib_connection *ic, *_ic; | |
206 | LIST_HEAD(tmp_list); | |
207 | ||
208 | /* avoid calling conn_destroy with irqs off */ | |
8aeb1ba6 ZB |
209 | spin_lock_irq(&ib_nodev_conns_lock); |
210 | list_splice(&ib_nodev_conns, &tmp_list); | |
211 | spin_unlock_irq(&ib_nodev_conns_lock); | |
08b48a1e | 212 | |
433d308d | 213 | list_for_each_entry_safe(ic, _ic, &tmp_list, ib_node) |
08b48a1e | 214 | rds_conn_destroy(ic->conn); |
08b48a1e AG |
215 | } |
216 | ||
217 | struct rds_ib_mr_pool *rds_ib_create_mr_pool(struct rds_ib_device *rds_ibdev) | |
218 | { | |
219 | struct rds_ib_mr_pool *pool; | |
220 | ||
221 | pool = kzalloc(sizeof(*pool), GFP_KERNEL); | |
222 | if (!pool) | |
223 | return ERR_PTR(-ENOMEM); | |
224 | ||
6fa70da6 CM |
225 | INIT_XLIST_HEAD(&pool->free_list); |
226 | INIT_XLIST_HEAD(&pool->drop_list); | |
227 | INIT_XLIST_HEAD(&pool->clean_list); | |
08b48a1e | 228 | mutex_init(&pool->flush_lock); |
6fa70da6 | 229 | init_waitqueue_head(&pool->flush_wait); |
7a0ff5db | 230 | INIT_DELAYED_WORK(&pool->flush_worker, rds_ib_mr_pool_flush_worker); |
08b48a1e AG |
231 | |
232 | pool->fmr_attr.max_pages = fmr_message_size; | |
233 | pool->fmr_attr.max_maps = rds_ibdev->fmr_max_remaps; | |
a870d627 | 234 | pool->fmr_attr.page_shift = PAGE_SHIFT; |
08b48a1e AG |
235 | pool->max_free_pinned = rds_ibdev->max_fmrs * fmr_message_size / 4; |
236 | ||
237 | /* We never allow more than max_items MRs to be allocated. | |
238 | * When we exceed more than max_items_soft, we start freeing | |
239 | * items more aggressively. | |
240 | * Make sure that max_items > max_items_soft > max_items / 2 | |
241 | */ | |
242 | pool->max_items_soft = rds_ibdev->max_fmrs * 3 / 4; | |
243 | pool->max_items = rds_ibdev->max_fmrs; | |
244 | ||
245 | return pool; | |
246 | } | |
247 | ||
248 | void rds_ib_get_mr_info(struct rds_ib_device *rds_ibdev, struct rds_info_rdma_connection *iinfo) | |
249 | { | |
250 | struct rds_ib_mr_pool *pool = rds_ibdev->mr_pool; | |
251 | ||
252 | iinfo->rdma_mr_max = pool->max_items; | |
253 | iinfo->rdma_mr_size = pool->fmr_attr.max_pages; | |
254 | } | |
255 | ||
256 | void rds_ib_destroy_mr_pool(struct rds_ib_mr_pool *pool) | |
257 | { | |
7a0ff5db | 258 | cancel_delayed_work_sync(&pool->flush_worker); |
6fa70da6 | 259 | rds_ib_flush_mr_pool(pool, 1, NULL); |
571c02fa AG |
260 | WARN_ON(atomic_read(&pool->item_count)); |
261 | WARN_ON(atomic_read(&pool->free_pinned)); | |
08b48a1e AG |
262 | kfree(pool); |
263 | } | |
264 | ||
6fa70da6 CM |
265 | static void refill_local(struct rds_ib_mr_pool *pool, struct xlist_head *xl, |
266 | struct rds_ib_mr **ibmr_ret) | |
267 | { | |
268 | struct xlist_head *ibmr_xl; | |
269 | ibmr_xl = xlist_del_head_fast(xl); | |
270 | *ibmr_ret = list_entry(ibmr_xl, struct rds_ib_mr, xlist); | |
271 | } | |
272 | ||
08b48a1e AG |
273 | static inline struct rds_ib_mr *rds_ib_reuse_fmr(struct rds_ib_mr_pool *pool) |
274 | { | |
275 | struct rds_ib_mr *ibmr = NULL; | |
6fa70da6 CM |
276 | struct xlist_head *ret; |
277 | unsigned long *flag; | |
08b48a1e | 278 | |
6fa70da6 CM |
279 | preempt_disable(); |
280 | flag = &__get_cpu_var(clean_list_grace); | |
281 | set_bit(CLEAN_LIST_BUSY_BIT, flag); | |
282 | ret = xlist_del_head(&pool->clean_list); | |
283 | if (ret) | |
284 | ibmr = list_entry(ret, struct rds_ib_mr, xlist); | |
08b48a1e | 285 | |
6fa70da6 CM |
286 | clear_bit(CLEAN_LIST_BUSY_BIT, flag); |
287 | preempt_enable(); | |
08b48a1e AG |
288 | return ibmr; |
289 | } | |
290 | ||
6fa70da6 CM |
291 | static inline void wait_clean_list_grace(void) |
292 | { | |
293 | int cpu; | |
294 | unsigned long *flag; | |
295 | ||
296 | for_each_online_cpu(cpu) { | |
297 | flag = &per_cpu(clean_list_grace, cpu); | |
298 | while (test_bit(CLEAN_LIST_BUSY_BIT, flag)) | |
299 | cpu_relax(); | |
300 | } | |
301 | } | |
302 | ||
08b48a1e AG |
303 | static struct rds_ib_mr *rds_ib_alloc_fmr(struct rds_ib_device *rds_ibdev) |
304 | { | |
305 | struct rds_ib_mr_pool *pool = rds_ibdev->mr_pool; | |
306 | struct rds_ib_mr *ibmr = NULL; | |
307 | int err = 0, iter = 0; | |
308 | ||
8576f374 CM |
309 | if (atomic_read(&pool->dirty_count) >= pool->max_items / 10) |
310 | queue_delayed_work(rds_ib_fmr_wq, &pool->flush_worker, 10); | |
311 | ||
08b48a1e AG |
312 | while (1) { |
313 | ibmr = rds_ib_reuse_fmr(pool); | |
314 | if (ibmr) | |
315 | return ibmr; | |
316 | ||
317 | /* No clean MRs - now we have the choice of either | |
318 | * allocating a fresh MR up to the limit imposed by the | |
319 | * driver, or flush any dirty unused MRs. | |
320 | * We try to avoid stalling in the send path if possible, | |
321 | * so we allocate as long as we're allowed to. | |
322 | * | |
323 | * We're fussy with enforcing the FMR limit, though. If the driver | |
324 | * tells us we can't use more than N fmrs, we shouldn't start | |
325 | * arguing with it */ | |
326 | if (atomic_inc_return(&pool->item_count) <= pool->max_items) | |
327 | break; | |
328 | ||
329 | atomic_dec(&pool->item_count); | |
330 | ||
331 | if (++iter > 2) { | |
332 | rds_ib_stats_inc(s_ib_rdma_mr_pool_depleted); | |
333 | return ERR_PTR(-EAGAIN); | |
334 | } | |
335 | ||
336 | /* We do have some empty MRs. Flush them out. */ | |
337 | rds_ib_stats_inc(s_ib_rdma_mr_pool_wait); | |
6fa70da6 CM |
338 | rds_ib_flush_mr_pool(pool, 0, &ibmr); |
339 | if (ibmr) | |
340 | return ibmr; | |
08b48a1e AG |
341 | } |
342 | ||
e4c52c98 | 343 | ibmr = kzalloc_node(sizeof(*ibmr), GFP_KERNEL, rdsibdev_to_node(rds_ibdev)); |
08b48a1e AG |
344 | if (!ibmr) { |
345 | err = -ENOMEM; | |
346 | goto out_no_cigar; | |
347 | } | |
348 | ||
38a4e5e6 CM |
349 | memset(ibmr, 0, sizeof(*ibmr)); |
350 | ||
08b48a1e AG |
351 | ibmr->fmr = ib_alloc_fmr(rds_ibdev->pd, |
352 | (IB_ACCESS_LOCAL_WRITE | | |
353 | IB_ACCESS_REMOTE_READ | | |
15133f6e AG |
354 | IB_ACCESS_REMOTE_WRITE| |
355 | IB_ACCESS_REMOTE_ATOMIC), | |
08b48a1e AG |
356 | &pool->fmr_attr); |
357 | if (IS_ERR(ibmr->fmr)) { | |
358 | err = PTR_ERR(ibmr->fmr); | |
359 | ibmr->fmr = NULL; | |
360 | printk(KERN_WARNING "RDS/IB: ib_alloc_fmr failed (err=%d)\n", err); | |
361 | goto out_no_cigar; | |
362 | } | |
363 | ||
364 | rds_ib_stats_inc(s_ib_rdma_mr_alloc); | |
365 | return ibmr; | |
366 | ||
367 | out_no_cigar: | |
368 | if (ibmr) { | |
369 | if (ibmr->fmr) | |
370 | ib_dealloc_fmr(ibmr->fmr); | |
371 | kfree(ibmr); | |
372 | } | |
373 | atomic_dec(&pool->item_count); | |
374 | return ERR_PTR(err); | |
375 | } | |
376 | ||
377 | static int rds_ib_map_fmr(struct rds_ib_device *rds_ibdev, struct rds_ib_mr *ibmr, | |
378 | struct scatterlist *sg, unsigned int nents) | |
379 | { | |
380 | struct ib_device *dev = rds_ibdev->dev; | |
381 | struct scatterlist *scat = sg; | |
382 | u64 io_addr = 0; | |
383 | u64 *dma_pages; | |
384 | u32 len; | |
385 | int page_cnt, sg_dma_len; | |
386 | int i, j; | |
387 | int ret; | |
388 | ||
389 | sg_dma_len = ib_dma_map_sg(dev, sg, nents, | |
390 | DMA_BIDIRECTIONAL); | |
391 | if (unlikely(!sg_dma_len)) { | |
392 | printk(KERN_WARNING "RDS/IB: dma_map_sg failed!\n"); | |
393 | return -EBUSY; | |
394 | } | |
395 | ||
396 | len = 0; | |
397 | page_cnt = 0; | |
398 | ||
399 | for (i = 0; i < sg_dma_len; ++i) { | |
400 | unsigned int dma_len = ib_sg_dma_len(dev, &scat[i]); | |
401 | u64 dma_addr = ib_sg_dma_address(dev, &scat[i]); | |
402 | ||
a870d627 | 403 | if (dma_addr & ~PAGE_MASK) { |
08b48a1e AG |
404 | if (i > 0) |
405 | return -EINVAL; | |
406 | else | |
407 | ++page_cnt; | |
408 | } | |
a870d627 | 409 | if ((dma_addr + dma_len) & ~PAGE_MASK) { |
08b48a1e AG |
410 | if (i < sg_dma_len - 1) |
411 | return -EINVAL; | |
412 | else | |
413 | ++page_cnt; | |
414 | } | |
415 | ||
416 | len += dma_len; | |
417 | } | |
418 | ||
a870d627 | 419 | page_cnt += len >> PAGE_SHIFT; |
08b48a1e AG |
420 | if (page_cnt > fmr_message_size) |
421 | return -EINVAL; | |
422 | ||
e4c52c98 AG |
423 | dma_pages = kmalloc_node(sizeof(u64) * page_cnt, GFP_ATOMIC, |
424 | rdsibdev_to_node(rds_ibdev)); | |
08b48a1e AG |
425 | if (!dma_pages) |
426 | return -ENOMEM; | |
427 | ||
428 | page_cnt = 0; | |
429 | for (i = 0; i < sg_dma_len; ++i) { | |
430 | unsigned int dma_len = ib_sg_dma_len(dev, &scat[i]); | |
431 | u64 dma_addr = ib_sg_dma_address(dev, &scat[i]); | |
432 | ||
a870d627 | 433 | for (j = 0; j < dma_len; j += PAGE_SIZE) |
08b48a1e | 434 | dma_pages[page_cnt++] = |
a870d627 | 435 | (dma_addr & PAGE_MASK) + j; |
08b48a1e AG |
436 | } |
437 | ||
438 | ret = ib_map_phys_fmr(ibmr->fmr, | |
439 | dma_pages, page_cnt, io_addr); | |
440 | if (ret) | |
441 | goto out; | |
442 | ||
443 | /* Success - we successfully remapped the MR, so we can | |
444 | * safely tear down the old mapping. */ | |
445 | rds_ib_teardown_mr(ibmr); | |
446 | ||
447 | ibmr->sg = scat; | |
448 | ibmr->sg_len = nents; | |
449 | ibmr->sg_dma_len = sg_dma_len; | |
450 | ibmr->remap_count++; | |
451 | ||
452 | rds_ib_stats_inc(s_ib_rdma_mr_used); | |
453 | ret = 0; | |
454 | ||
455 | out: | |
456 | kfree(dma_pages); | |
457 | ||
458 | return ret; | |
459 | } | |
460 | ||
461 | void rds_ib_sync_mr(void *trans_private, int direction) | |
462 | { | |
463 | struct rds_ib_mr *ibmr = trans_private; | |
464 | struct rds_ib_device *rds_ibdev = ibmr->device; | |
465 | ||
466 | switch (direction) { | |
467 | case DMA_FROM_DEVICE: | |
468 | ib_dma_sync_sg_for_cpu(rds_ibdev->dev, ibmr->sg, | |
469 | ibmr->sg_dma_len, DMA_BIDIRECTIONAL); | |
470 | break; | |
471 | case DMA_TO_DEVICE: | |
472 | ib_dma_sync_sg_for_device(rds_ibdev->dev, ibmr->sg, | |
473 | ibmr->sg_dma_len, DMA_BIDIRECTIONAL); | |
474 | break; | |
475 | } | |
476 | } | |
477 | ||
478 | static void __rds_ib_teardown_mr(struct rds_ib_mr *ibmr) | |
479 | { | |
480 | struct rds_ib_device *rds_ibdev = ibmr->device; | |
481 | ||
482 | if (ibmr->sg_dma_len) { | |
483 | ib_dma_unmap_sg(rds_ibdev->dev, | |
484 | ibmr->sg, ibmr->sg_len, | |
485 | DMA_BIDIRECTIONAL); | |
486 | ibmr->sg_dma_len = 0; | |
487 | } | |
488 | ||
489 | /* Release the s/g list */ | |
490 | if (ibmr->sg_len) { | |
491 | unsigned int i; | |
492 | ||
493 | for (i = 0; i < ibmr->sg_len; ++i) { | |
494 | struct page *page = sg_page(&ibmr->sg[i]); | |
495 | ||
496 | /* FIXME we need a way to tell a r/w MR | |
497 | * from a r/o MR */ | |
9e2effba | 498 | BUG_ON(irqs_disabled()); |
08b48a1e AG |
499 | set_page_dirty(page); |
500 | put_page(page); | |
501 | } | |
502 | kfree(ibmr->sg); | |
503 | ||
504 | ibmr->sg = NULL; | |
505 | ibmr->sg_len = 0; | |
506 | } | |
507 | } | |
508 | ||
509 | static void rds_ib_teardown_mr(struct rds_ib_mr *ibmr) | |
510 | { | |
511 | unsigned int pinned = ibmr->sg_len; | |
512 | ||
513 | __rds_ib_teardown_mr(ibmr); | |
514 | if (pinned) { | |
515 | struct rds_ib_device *rds_ibdev = ibmr->device; | |
516 | struct rds_ib_mr_pool *pool = rds_ibdev->mr_pool; | |
517 | ||
518 | atomic_sub(pinned, &pool->free_pinned); | |
519 | } | |
520 | } | |
521 | ||
522 | static inline unsigned int rds_ib_flush_goal(struct rds_ib_mr_pool *pool, int free_all) | |
523 | { | |
524 | unsigned int item_count; | |
525 | ||
526 | item_count = atomic_read(&pool->item_count); | |
527 | if (free_all) | |
528 | return item_count; | |
529 | ||
530 | return 0; | |
531 | } | |
532 | ||
6fa70da6 CM |
533 | /* |
534 | * given an xlist of mrs, put them all into the list_head for more processing | |
535 | */ | |
536 | static void xlist_append_to_list(struct xlist_head *xlist, struct list_head *list) | |
537 | { | |
538 | struct rds_ib_mr *ibmr; | |
539 | struct xlist_head splice; | |
540 | struct xlist_head *cur; | |
541 | struct xlist_head *next; | |
542 | ||
543 | splice.next = NULL; | |
544 | xlist_splice(xlist, &splice); | |
545 | cur = splice.next; | |
546 | while (cur) { | |
547 | next = cur->next; | |
548 | ibmr = list_entry(cur, struct rds_ib_mr, xlist); | |
549 | list_add_tail(&ibmr->unmap_list, list); | |
550 | cur = next; | |
551 | } | |
552 | } | |
553 | ||
554 | /* | |
555 | * this takes a list head of mrs and turns it into an xlist of clusters. | |
556 | * each cluster has an xlist of MR_CLUSTER_SIZE mrs that are ready for | |
557 | * reuse. | |
558 | */ | |
559 | static void list_append_to_xlist(struct rds_ib_mr_pool *pool, | |
560 | struct list_head *list, struct xlist_head *xlist, | |
561 | struct xlist_head **tail_ret) | |
562 | { | |
563 | struct rds_ib_mr *ibmr; | |
564 | struct xlist_head *cur_mr = xlist; | |
565 | struct xlist_head *tail_mr = NULL; | |
566 | ||
567 | list_for_each_entry(ibmr, list, unmap_list) { | |
568 | tail_mr = &ibmr->xlist; | |
569 | tail_mr->next = NULL; | |
570 | cur_mr->next = tail_mr; | |
571 | cur_mr = tail_mr; | |
572 | } | |
573 | *tail_ret = tail_mr; | |
574 | } | |
575 | ||
08b48a1e AG |
576 | /* |
577 | * Flush our pool of MRs. | |
578 | * At a minimum, all currently unused MRs are unmapped. | |
579 | * If the number of MRs allocated exceeds the limit, we also try | |
580 | * to free as many MRs as needed to get back to this limit. | |
581 | */ | |
6fa70da6 CM |
582 | static int rds_ib_flush_mr_pool(struct rds_ib_mr_pool *pool, |
583 | int free_all, struct rds_ib_mr **ibmr_ret) | |
08b48a1e AG |
584 | { |
585 | struct rds_ib_mr *ibmr, *next; | |
6fa70da6 CM |
586 | struct xlist_head clean_xlist; |
587 | struct xlist_head *clean_tail; | |
08b48a1e AG |
588 | LIST_HEAD(unmap_list); |
589 | LIST_HEAD(fmr_list); | |
590 | unsigned long unpinned = 0; | |
08b48a1e AG |
591 | unsigned int nfreed = 0, ncleaned = 0, free_goal; |
592 | int ret = 0; | |
593 | ||
594 | rds_ib_stats_inc(s_ib_rdma_mr_pool_flush); | |
595 | ||
6fa70da6 CM |
596 | if (ibmr_ret) { |
597 | DEFINE_WAIT(wait); | |
598 | while(!mutex_trylock(&pool->flush_lock)) { | |
599 | ibmr = rds_ib_reuse_fmr(pool); | |
600 | if (ibmr) { | |
601 | *ibmr_ret = ibmr; | |
602 | finish_wait(&pool->flush_wait, &wait); | |
603 | goto out_nolock; | |
604 | } | |
605 | ||
606 | prepare_to_wait(&pool->flush_wait, &wait, | |
607 | TASK_UNINTERRUPTIBLE); | |
608 | if (xlist_empty(&pool->clean_list)) | |
609 | schedule(); | |
610 | ||
611 | ibmr = rds_ib_reuse_fmr(pool); | |
612 | if (ibmr) { | |
613 | *ibmr_ret = ibmr; | |
614 | finish_wait(&pool->flush_wait, &wait); | |
615 | goto out_nolock; | |
616 | } | |
617 | } | |
618 | finish_wait(&pool->flush_wait, &wait); | |
619 | } else | |
620 | mutex_lock(&pool->flush_lock); | |
621 | ||
622 | if (ibmr_ret) { | |
623 | ibmr = rds_ib_reuse_fmr(pool); | |
624 | if (ibmr) { | |
625 | *ibmr_ret = ibmr; | |
626 | goto out; | |
627 | } | |
628 | } | |
08b48a1e | 629 | |
08b48a1e | 630 | /* Get the list of all MRs to be dropped. Ordering matters - |
6fa70da6 CM |
631 | * we want to put drop_list ahead of free_list. |
632 | */ | |
633 | xlist_append_to_list(&pool->drop_list, &unmap_list); | |
634 | xlist_append_to_list(&pool->free_list, &unmap_list); | |
08b48a1e | 635 | if (free_all) |
6fa70da6 | 636 | xlist_append_to_list(&pool->clean_list, &unmap_list); |
08b48a1e AG |
637 | |
638 | free_goal = rds_ib_flush_goal(pool, free_all); | |
639 | ||
640 | if (list_empty(&unmap_list)) | |
641 | goto out; | |
642 | ||
643 | /* String all ib_mr's onto one list and hand them to ib_unmap_fmr */ | |
6fa70da6 | 644 | list_for_each_entry(ibmr, &unmap_list, unmap_list) |
08b48a1e | 645 | list_add(&ibmr->fmr->list, &fmr_list); |
6fa70da6 | 646 | |
08b48a1e AG |
647 | ret = ib_unmap_fmr(&fmr_list); |
648 | if (ret) | |
649 | printk(KERN_WARNING "RDS/IB: ib_unmap_fmr failed (err=%d)\n", ret); | |
650 | ||
651 | /* Now we can destroy the DMA mapping and unpin any pages */ | |
6fa70da6 | 652 | list_for_each_entry_safe(ibmr, next, &unmap_list, unmap_list) { |
08b48a1e AG |
653 | unpinned += ibmr->sg_len; |
654 | __rds_ib_teardown_mr(ibmr); | |
655 | if (nfreed < free_goal || ibmr->remap_count >= pool->fmr_attr.max_maps) { | |
656 | rds_ib_stats_inc(s_ib_rdma_mr_free); | |
6fa70da6 | 657 | list_del(&ibmr->unmap_list); |
08b48a1e AG |
658 | ib_dealloc_fmr(ibmr->fmr); |
659 | kfree(ibmr); | |
660 | nfreed++; | |
661 | } | |
662 | ncleaned++; | |
663 | } | |
664 | ||
6fa70da6 CM |
665 | if (!list_empty(&unmap_list)) { |
666 | /* we have to make sure that none of the things we're about | |
667 | * to put on the clean list would race with other cpus trying | |
668 | * to pull items off. The xlist would explode if we managed to | |
669 | * remove something from the clean list and then add it back again | |
670 | * while another CPU was spinning on that same item in xlist_del_head. | |
671 | * | |
672 | * This is pretty unlikely, but just in case wait for an xlist grace period | |
673 | * here before adding anything back into the clean list. | |
674 | */ | |
675 | wait_clean_list_grace(); | |
676 | ||
677 | list_append_to_xlist(pool, &unmap_list, &clean_xlist, &clean_tail); | |
678 | if (ibmr_ret) | |
679 | refill_local(pool, &clean_xlist, ibmr_ret); | |
680 | ||
681 | /* refill_local may have emptied our list */ | |
682 | if (!xlist_empty(&clean_xlist)) | |
683 | xlist_add(clean_xlist.next, clean_tail, &pool->clean_list); | |
684 | ||
685 | } | |
08b48a1e AG |
686 | |
687 | atomic_sub(unpinned, &pool->free_pinned); | |
688 | atomic_sub(ncleaned, &pool->dirty_count); | |
689 | atomic_sub(nfreed, &pool->item_count); | |
690 | ||
691 | out: | |
692 | mutex_unlock(&pool->flush_lock); | |
6fa70da6 CM |
693 | if (waitqueue_active(&pool->flush_wait)) |
694 | wake_up(&pool->flush_wait); | |
695 | out_nolock: | |
08b48a1e AG |
696 | return ret; |
697 | } | |
698 | ||
ef87b7ea | 699 | int rds_ib_fmr_init(void) |
515e079d ZB |
700 | { |
701 | rds_ib_fmr_wq = create_workqueue("rds_fmr_flushd"); | |
702 | if (!rds_ib_fmr_wq) | |
703 | return -ENOMEM; | |
704 | return 0; | |
705 | } | |
706 | ||
707 | /* | |
708 | * By the time this is called all the IB devices should have been torn down and | |
709 | * had their pools freed. As each pool is freed its work struct is waited on, | |
710 | * so the pool flushing work queue should be idle by the time we get here. | |
711 | */ | |
ef87b7ea | 712 | void rds_ib_fmr_exit(void) |
515e079d ZB |
713 | { |
714 | destroy_workqueue(rds_ib_fmr_wq); | |
715 | } | |
716 | ||
08b48a1e AG |
717 | static void rds_ib_mr_pool_flush_worker(struct work_struct *work) |
718 | { | |
7a0ff5db | 719 | struct rds_ib_mr_pool *pool = container_of(work, struct rds_ib_mr_pool, flush_worker.work); |
08b48a1e | 720 | |
6fa70da6 | 721 | rds_ib_flush_mr_pool(pool, 0, NULL); |
08b48a1e AG |
722 | } |
723 | ||
724 | void rds_ib_free_mr(void *trans_private, int invalidate) | |
725 | { | |
726 | struct rds_ib_mr *ibmr = trans_private; | |
727 | struct rds_ib_device *rds_ibdev = ibmr->device; | |
728 | struct rds_ib_mr_pool *pool = rds_ibdev->mr_pool; | |
08b48a1e AG |
729 | |
730 | rdsdebug("RDS/IB: free_mr nents %u\n", ibmr->sg_len); | |
731 | ||
732 | /* Return it to the pool's free list */ | |
08b48a1e | 733 | if (ibmr->remap_count >= pool->fmr_attr.max_maps) |
6fa70da6 | 734 | xlist_add(&ibmr->xlist, &ibmr->xlist, &pool->drop_list); |
08b48a1e | 735 | else |
6fa70da6 | 736 | xlist_add(&ibmr->xlist, &ibmr->xlist, &pool->free_list); |
08b48a1e AG |
737 | |
738 | atomic_add(ibmr->sg_len, &pool->free_pinned); | |
739 | atomic_inc(&pool->dirty_count); | |
08b48a1e AG |
740 | |
741 | /* If we've pinned too many pages, request a flush */ | |
f64f9e71 JP |
742 | if (atomic_read(&pool->free_pinned) >= pool->max_free_pinned || |
743 | atomic_read(&pool->dirty_count) >= pool->max_items / 10) | |
515e079d | 744 | queue_delayed_work(rds_ib_fmr_wq, &pool->flush_worker, 10); |
08b48a1e AG |
745 | |
746 | if (invalidate) { | |
747 | if (likely(!in_interrupt())) { | |
6fa70da6 | 748 | rds_ib_flush_mr_pool(pool, 0, NULL); |
08b48a1e AG |
749 | } else { |
750 | /* We get here if the user created a MR marked | |
751 | * as use_once and invalidate at the same time. */ | |
515e079d ZB |
752 | queue_delayed_work(rds_ib_fmr_wq, |
753 | &pool->flush_worker, 10); | |
08b48a1e AG |
754 | } |
755 | } | |
3e0249f9 ZB |
756 | |
757 | rds_ib_dev_put(rds_ibdev); | |
08b48a1e AG |
758 | } |
759 | ||
760 | void rds_ib_flush_mrs(void) | |
761 | { | |
762 | struct rds_ib_device *rds_ibdev; | |
763 | ||
ea819867 | 764 | down_read(&rds_ib_devices_lock); |
08b48a1e AG |
765 | list_for_each_entry(rds_ibdev, &rds_ib_devices, list) { |
766 | struct rds_ib_mr_pool *pool = rds_ibdev->mr_pool; | |
767 | ||
768 | if (pool) | |
6fa70da6 | 769 | rds_ib_flush_mr_pool(pool, 0, NULL); |
08b48a1e | 770 | } |
ea819867 | 771 | up_read(&rds_ib_devices_lock); |
08b48a1e AG |
772 | } |
773 | ||
774 | void *rds_ib_get_mr(struct scatterlist *sg, unsigned long nents, | |
775 | struct rds_sock *rs, u32 *key_ret) | |
776 | { | |
777 | struct rds_ib_device *rds_ibdev; | |
778 | struct rds_ib_mr *ibmr = NULL; | |
779 | int ret; | |
780 | ||
781 | rds_ibdev = rds_ib_get_device(rs->rs_bound_addr); | |
782 | if (!rds_ibdev) { | |
783 | ret = -ENODEV; | |
784 | goto out; | |
785 | } | |
786 | ||
787 | if (!rds_ibdev->mr_pool) { | |
788 | ret = -ENODEV; | |
789 | goto out; | |
790 | } | |
791 | ||
792 | ibmr = rds_ib_alloc_fmr(rds_ibdev); | |
793 | if (IS_ERR(ibmr)) | |
794 | return ibmr; | |
795 | ||
796 | ret = rds_ib_map_fmr(rds_ibdev, ibmr, sg, nents); | |
797 | if (ret == 0) | |
798 | *key_ret = ibmr->fmr->rkey; | |
799 | else | |
800 | printk(KERN_WARNING "RDS/IB: map_fmr failed (errno=%d)\n", ret); | |
801 | ||
802 | ibmr->device = rds_ibdev; | |
3e0249f9 | 803 | rds_ibdev = NULL; |
08b48a1e AG |
804 | |
805 | out: | |
806 | if (ret) { | |
807 | if (ibmr) | |
808 | rds_ib_free_mr(ibmr, 0); | |
809 | ibmr = ERR_PTR(ret); | |
810 | } | |
3e0249f9 ZB |
811 | if (rds_ibdev) |
812 | rds_ib_dev_put(rds_ibdev); | |
08b48a1e AG |
813 | return ibmr; |
814 | } | |
6fa70da6 | 815 |