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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> |
1bc144b6 | 36 | #include <linux/llist.h> |
08b48a1e AG |
37 | |
38 | #include "rds.h" | |
08b48a1e AG |
39 | #include "ib.h" |
40 | ||
6fa70da6 CM |
41 | static DEFINE_PER_CPU(unsigned long, clean_list_grace); |
42 | #define CLEAN_LIST_BUSY_BIT 0 | |
08b48a1e AG |
43 | |
44 | /* | |
45 | * This is stored as mr->r_trans_private. | |
46 | */ | |
47 | struct rds_ib_mr { | |
48 | struct rds_ib_device *device; | |
49 | struct rds_ib_mr_pool *pool; | |
50 | struct ib_fmr *fmr; | |
6fa70da6 | 51 | |
1bc144b6 | 52 | struct llist_node llnode; |
6fa70da6 CM |
53 | |
54 | /* unmap_list is for freeing */ | |
55 | struct list_head unmap_list; | |
08b48a1e AG |
56 | unsigned int remap_count; |
57 | ||
58 | struct scatterlist *sg; | |
59 | unsigned int sg_len; | |
60 | u64 *dma; | |
61 | int sg_dma_len; | |
62 | }; | |
63 | ||
64 | /* | |
65 | * Our own little FMR pool | |
66 | */ | |
67 | struct rds_ib_mr_pool { | |
06766513 | 68 | unsigned int pool_type; |
08b48a1e | 69 | struct mutex flush_lock; /* serialize fmr invalidate */ |
7a0ff5db | 70 | struct delayed_work flush_worker; /* flush worker */ |
08b48a1e | 71 | |
08b48a1e AG |
72 | atomic_t item_count; /* total # of MRs */ |
73 | atomic_t dirty_count; /* # dirty of MRs */ | |
6fa70da6 | 74 | |
1bc144b6 HY |
75 | struct llist_head drop_list; /* MRs that have reached their max_maps limit */ |
76 | struct llist_head free_list; /* unused MRs */ | |
77 | struct llist_head clean_list; /* global unused & unamapped MRs */ | |
6fa70da6 CM |
78 | wait_queue_head_t flush_wait; |
79 | ||
08b48a1e AG |
80 | atomic_t free_pinned; /* memory pinned by free MRs */ |
81 | unsigned long max_items; | |
82 | unsigned long max_items_soft; | |
83 | unsigned long max_free_pinned; | |
84 | struct ib_fmr_attr fmr_attr; | |
85 | }; | |
86 | ||
67161e25 | 87 | static struct workqueue_struct *rds_ib_fmr_wq; |
ad1d7dc0 | 88 | |
89 | int rds_ib_fmr_init(void) | |
90 | { | |
91 | rds_ib_fmr_wq = create_workqueue("rds_fmr_flushd"); | |
92 | if (!rds_ib_fmr_wq) | |
93 | return -ENOMEM; | |
94 | return 0; | |
95 | } | |
96 | ||
97 | /* By the time this is called all the IB devices should have been torn down and | |
98 | * had their pools freed. As each pool is freed its work struct is waited on, | |
99 | * so the pool flushing work queue should be idle by the time we get here. | |
100 | */ | |
101 | void rds_ib_fmr_exit(void) | |
102 | { | |
103 | destroy_workqueue(rds_ib_fmr_wq); | |
104 | } | |
105 | ||
6fa70da6 | 106 | static int rds_ib_flush_mr_pool(struct rds_ib_mr_pool *pool, int free_all, struct rds_ib_mr **); |
08b48a1e AG |
107 | static void rds_ib_teardown_mr(struct rds_ib_mr *ibmr); |
108 | static void rds_ib_mr_pool_flush_worker(struct work_struct *work); | |
109 | ||
110 | static struct rds_ib_device *rds_ib_get_device(__be32 ipaddr) | |
111 | { | |
112 | struct rds_ib_device *rds_ibdev; | |
113 | struct rds_ib_ipaddr *i_ipaddr; | |
114 | ||
ea819867 ZB |
115 | rcu_read_lock(); |
116 | list_for_each_entry_rcu(rds_ibdev, &rds_ib_devices, list) { | |
764f2dd9 | 117 | list_for_each_entry_rcu(i_ipaddr, &rds_ibdev->ipaddr_list, list) { |
08b48a1e | 118 | if (i_ipaddr->ipaddr == ipaddr) { |
3e0249f9 | 119 | atomic_inc(&rds_ibdev->refcount); |
764f2dd9 | 120 | rcu_read_unlock(); |
08b48a1e AG |
121 | return rds_ibdev; |
122 | } | |
123 | } | |
08b48a1e | 124 | } |
ea819867 | 125 | rcu_read_unlock(); |
08b48a1e AG |
126 | |
127 | return NULL; | |
128 | } | |
129 | ||
130 | static int rds_ib_add_ipaddr(struct rds_ib_device *rds_ibdev, __be32 ipaddr) | |
131 | { | |
132 | struct rds_ib_ipaddr *i_ipaddr; | |
133 | ||
134 | i_ipaddr = kmalloc(sizeof *i_ipaddr, GFP_KERNEL); | |
135 | if (!i_ipaddr) | |
136 | return -ENOMEM; | |
137 | ||
138 | i_ipaddr->ipaddr = ipaddr; | |
139 | ||
140 | spin_lock_irq(&rds_ibdev->spinlock); | |
764f2dd9 | 141 | list_add_tail_rcu(&i_ipaddr->list, &rds_ibdev->ipaddr_list); |
08b48a1e AG |
142 | spin_unlock_irq(&rds_ibdev->spinlock); |
143 | ||
144 | return 0; | |
145 | } | |
146 | ||
147 | static void rds_ib_remove_ipaddr(struct rds_ib_device *rds_ibdev, __be32 ipaddr) | |
148 | { | |
4a81802b | 149 | struct rds_ib_ipaddr *i_ipaddr; |
764f2dd9 CM |
150 | struct rds_ib_ipaddr *to_free = NULL; |
151 | ||
08b48a1e AG |
152 | |
153 | spin_lock_irq(&rds_ibdev->spinlock); | |
764f2dd9 | 154 | list_for_each_entry_rcu(i_ipaddr, &rds_ibdev->ipaddr_list, list) { |
08b48a1e | 155 | if (i_ipaddr->ipaddr == ipaddr) { |
764f2dd9 CM |
156 | list_del_rcu(&i_ipaddr->list); |
157 | to_free = i_ipaddr; | |
08b48a1e AG |
158 | break; |
159 | } | |
160 | } | |
161 | spin_unlock_irq(&rds_ibdev->spinlock); | |
764f2dd9 | 162 | |
59fe4606 SS |
163 | if (to_free) |
164 | kfree_rcu(to_free, rcu); | |
08b48a1e AG |
165 | } |
166 | ||
167 | int rds_ib_update_ipaddr(struct rds_ib_device *rds_ibdev, __be32 ipaddr) | |
168 | { | |
169 | struct rds_ib_device *rds_ibdev_old; | |
170 | ||
171 | rds_ibdev_old = rds_ib_get_device(ipaddr); | |
e1f475a7 | 172 | if (!rds_ibdev_old) |
173 | return rds_ib_add_ipaddr(rds_ibdev, ipaddr); | |
174 | ||
175 | if (rds_ibdev_old != rds_ibdev) { | |
08b48a1e | 176 | rds_ib_remove_ipaddr(rds_ibdev_old, ipaddr); |
3e0249f9 | 177 | rds_ib_dev_put(rds_ibdev_old); |
e1f475a7 | 178 | return rds_ib_add_ipaddr(rds_ibdev, ipaddr); |
3e0249f9 | 179 | } |
e1f475a7 | 180 | rds_ib_dev_put(rds_ibdev_old); |
08b48a1e | 181 | |
e1f475a7 | 182 | return 0; |
08b48a1e AG |
183 | } |
184 | ||
745cbcca | 185 | void rds_ib_add_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn) |
08b48a1e AG |
186 | { |
187 | struct rds_ib_connection *ic = conn->c_transport_data; | |
188 | ||
189 | /* conn was previously on the nodev_conns_list */ | |
190 | spin_lock_irq(&ib_nodev_conns_lock); | |
191 | BUG_ON(list_empty(&ib_nodev_conns)); | |
192 | BUG_ON(list_empty(&ic->ib_node)); | |
193 | list_del(&ic->ib_node); | |
08b48a1e | 194 | |
aef3ea33 | 195 | spin_lock(&rds_ibdev->spinlock); |
08b48a1e | 196 | list_add_tail(&ic->ib_node, &rds_ibdev->conn_list); |
aef3ea33 | 197 | spin_unlock(&rds_ibdev->spinlock); |
745cbcca | 198 | spin_unlock_irq(&ib_nodev_conns_lock); |
08b48a1e AG |
199 | |
200 | ic->rds_ibdev = rds_ibdev; | |
3e0249f9 | 201 | atomic_inc(&rds_ibdev->refcount); |
08b48a1e AG |
202 | } |
203 | ||
745cbcca | 204 | void rds_ib_remove_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn) |
08b48a1e | 205 | { |
745cbcca | 206 | struct rds_ib_connection *ic = conn->c_transport_data; |
08b48a1e | 207 | |
745cbcca AG |
208 | /* place conn on nodev_conns_list */ |
209 | spin_lock(&ib_nodev_conns_lock); | |
08b48a1e | 210 | |
745cbcca AG |
211 | spin_lock_irq(&rds_ibdev->spinlock); |
212 | BUG_ON(list_empty(&ic->ib_node)); | |
213 | list_del(&ic->ib_node); | |
214 | spin_unlock_irq(&rds_ibdev->spinlock); | |
215 | ||
216 | list_add_tail(&ic->ib_node, &ib_nodev_conns); | |
217 | ||
218 | spin_unlock(&ib_nodev_conns_lock); | |
219 | ||
220 | ic->rds_ibdev = NULL; | |
3e0249f9 | 221 | rds_ib_dev_put(rds_ibdev); |
08b48a1e AG |
222 | } |
223 | ||
8aeb1ba6 | 224 | void rds_ib_destroy_nodev_conns(void) |
08b48a1e AG |
225 | { |
226 | struct rds_ib_connection *ic, *_ic; | |
227 | LIST_HEAD(tmp_list); | |
228 | ||
229 | /* avoid calling conn_destroy with irqs off */ | |
8aeb1ba6 ZB |
230 | spin_lock_irq(&ib_nodev_conns_lock); |
231 | list_splice(&ib_nodev_conns, &tmp_list); | |
232 | spin_unlock_irq(&ib_nodev_conns_lock); | |
08b48a1e | 233 | |
433d308d | 234 | list_for_each_entry_safe(ic, _ic, &tmp_list, ib_node) |
08b48a1e | 235 | rds_conn_destroy(ic->conn); |
08b48a1e AG |
236 | } |
237 | ||
06766513 SS |
238 | struct rds_ib_mr_pool *rds_ib_create_mr_pool(struct rds_ib_device *rds_ibdev, |
239 | int pool_type) | |
08b48a1e AG |
240 | { |
241 | struct rds_ib_mr_pool *pool; | |
242 | ||
243 | pool = kzalloc(sizeof(*pool), GFP_KERNEL); | |
244 | if (!pool) | |
245 | return ERR_PTR(-ENOMEM); | |
246 | ||
06766513 | 247 | pool->pool_type = pool_type; |
1bc144b6 HY |
248 | init_llist_head(&pool->free_list); |
249 | init_llist_head(&pool->drop_list); | |
250 | init_llist_head(&pool->clean_list); | |
08b48a1e | 251 | mutex_init(&pool->flush_lock); |
6fa70da6 | 252 | init_waitqueue_head(&pool->flush_wait); |
7a0ff5db | 253 | INIT_DELAYED_WORK(&pool->flush_worker, rds_ib_mr_pool_flush_worker); |
08b48a1e | 254 | |
06766513 SS |
255 | if (pool_type == RDS_IB_MR_1M_POOL) { |
256 | /* +1 allows for unaligned MRs */ | |
257 | pool->fmr_attr.max_pages = RDS_FMR_1M_MSG_SIZE + 1; | |
258 | pool->max_items = RDS_FMR_1M_POOL_SIZE; | |
259 | } else { | |
260 | /* pool_type == RDS_IB_MR_8K_POOL */ | |
261 | pool->fmr_attr.max_pages = RDS_FMR_8K_MSG_SIZE + 1; | |
262 | pool->max_items = RDS_FMR_8K_POOL_SIZE; | |
263 | } | |
264 | ||
265 | pool->max_free_pinned = pool->max_items * pool->fmr_attr.max_pages / 4; | |
08b48a1e | 266 | pool->fmr_attr.max_maps = rds_ibdev->fmr_max_remaps; |
a870d627 | 267 | pool->fmr_attr.page_shift = PAGE_SHIFT; |
08b48a1e | 268 | pool->max_items_soft = rds_ibdev->max_fmrs * 3 / 4; |
08b48a1e AG |
269 | |
270 | return pool; | |
271 | } | |
272 | ||
273 | void rds_ib_get_mr_info(struct rds_ib_device *rds_ibdev, struct rds_info_rdma_connection *iinfo) | |
274 | { | |
06766513 | 275 | struct rds_ib_mr_pool *pool_1m = rds_ibdev->mr_1m_pool; |
08b48a1e | 276 | |
06766513 SS |
277 | iinfo->rdma_mr_max = pool_1m->max_items; |
278 | iinfo->rdma_mr_size = pool_1m->fmr_attr.max_pages; | |
08b48a1e AG |
279 | } |
280 | ||
281 | void rds_ib_destroy_mr_pool(struct rds_ib_mr_pool *pool) | |
282 | { | |
7a0ff5db | 283 | cancel_delayed_work_sync(&pool->flush_worker); |
6fa70da6 | 284 | rds_ib_flush_mr_pool(pool, 1, NULL); |
571c02fa AG |
285 | WARN_ON(atomic_read(&pool->item_count)); |
286 | WARN_ON(atomic_read(&pool->free_pinned)); | |
08b48a1e AG |
287 | kfree(pool); |
288 | } | |
289 | ||
290 | static inline struct rds_ib_mr *rds_ib_reuse_fmr(struct rds_ib_mr_pool *pool) | |
291 | { | |
292 | struct rds_ib_mr *ibmr = NULL; | |
1bc144b6 | 293 | struct llist_node *ret; |
6fa70da6 | 294 | unsigned long *flag; |
08b48a1e | 295 | |
6fa70da6 | 296 | preempt_disable(); |
903ceff7 | 297 | flag = this_cpu_ptr(&clean_list_grace); |
6fa70da6 | 298 | set_bit(CLEAN_LIST_BUSY_BIT, flag); |
1bc144b6 | 299 | ret = llist_del_first(&pool->clean_list); |
6fa70da6 | 300 | if (ret) |
1bc144b6 | 301 | ibmr = llist_entry(ret, struct rds_ib_mr, llnode); |
08b48a1e | 302 | |
6fa70da6 CM |
303 | clear_bit(CLEAN_LIST_BUSY_BIT, flag); |
304 | preempt_enable(); | |
08b48a1e AG |
305 | return ibmr; |
306 | } | |
307 | ||
6fa70da6 CM |
308 | static inline void wait_clean_list_grace(void) |
309 | { | |
310 | int cpu; | |
311 | unsigned long *flag; | |
312 | ||
313 | for_each_online_cpu(cpu) { | |
314 | flag = &per_cpu(clean_list_grace, cpu); | |
315 | while (test_bit(CLEAN_LIST_BUSY_BIT, flag)) | |
316 | cpu_relax(); | |
317 | } | |
318 | } | |
319 | ||
06766513 SS |
320 | static struct rds_ib_mr *rds_ib_alloc_fmr(struct rds_ib_device *rds_ibdev, |
321 | int npages) | |
08b48a1e | 322 | { |
06766513 | 323 | struct rds_ib_mr_pool *pool; |
08b48a1e AG |
324 | struct rds_ib_mr *ibmr = NULL; |
325 | int err = 0, iter = 0; | |
326 | ||
06766513 SS |
327 | if (npages <= RDS_FMR_8K_MSG_SIZE) |
328 | pool = rds_ibdev->mr_8k_pool; | |
329 | else | |
330 | pool = rds_ibdev->mr_1m_pool; | |
331 | ||
8576f374 | 332 | if (atomic_read(&pool->dirty_count) >= pool->max_items / 10) |
2e1d6b81 | 333 | queue_delayed_work(rds_ib_fmr_wq, &pool->flush_worker, 10); |
8576f374 | 334 | |
06766513 SS |
335 | /* Switch pools if one of the pool is reaching upper limit */ |
336 | if (atomic_read(&pool->dirty_count) >= pool->max_items * 9 / 10) { | |
337 | if (pool->pool_type == RDS_IB_MR_8K_POOL) | |
338 | pool = rds_ibdev->mr_1m_pool; | |
339 | else | |
340 | pool = rds_ibdev->mr_8k_pool; | |
341 | } | |
342 | ||
08b48a1e AG |
343 | while (1) { |
344 | ibmr = rds_ib_reuse_fmr(pool); | |
345 | if (ibmr) | |
346 | return ibmr; | |
347 | ||
348 | /* No clean MRs - now we have the choice of either | |
349 | * allocating a fresh MR up to the limit imposed by the | |
350 | * driver, or flush any dirty unused MRs. | |
351 | * We try to avoid stalling in the send path if possible, | |
352 | * so we allocate as long as we're allowed to. | |
353 | * | |
354 | * We're fussy with enforcing the FMR limit, though. If the driver | |
355 | * tells us we can't use more than N fmrs, we shouldn't start | |
356 | * arguing with it */ | |
357 | if (atomic_inc_return(&pool->item_count) <= pool->max_items) | |
358 | break; | |
359 | ||
360 | atomic_dec(&pool->item_count); | |
361 | ||
362 | if (++iter > 2) { | |
06766513 SS |
363 | if (pool->pool_type == RDS_IB_MR_8K_POOL) |
364 | rds_ib_stats_inc(s_ib_rdma_mr_8k_pool_depleted); | |
365 | else | |
366 | rds_ib_stats_inc(s_ib_rdma_mr_1m_pool_depleted); | |
08b48a1e AG |
367 | return ERR_PTR(-EAGAIN); |
368 | } | |
369 | ||
370 | /* We do have some empty MRs. Flush them out. */ | |
06766513 SS |
371 | if (pool->pool_type == RDS_IB_MR_8K_POOL) |
372 | rds_ib_stats_inc(s_ib_rdma_mr_8k_pool_wait); | |
373 | else | |
374 | rds_ib_stats_inc(s_ib_rdma_mr_1m_pool_wait); | |
6fa70da6 CM |
375 | rds_ib_flush_mr_pool(pool, 0, &ibmr); |
376 | if (ibmr) | |
377 | return ibmr; | |
08b48a1e AG |
378 | } |
379 | ||
e4c52c98 | 380 | ibmr = kzalloc_node(sizeof(*ibmr), GFP_KERNEL, rdsibdev_to_node(rds_ibdev)); |
08b48a1e AG |
381 | if (!ibmr) { |
382 | err = -ENOMEM; | |
383 | goto out_no_cigar; | |
384 | } | |
385 | ||
386 | ibmr->fmr = ib_alloc_fmr(rds_ibdev->pd, | |
387 | (IB_ACCESS_LOCAL_WRITE | | |
388 | IB_ACCESS_REMOTE_READ | | |
15133f6e AG |
389 | IB_ACCESS_REMOTE_WRITE| |
390 | IB_ACCESS_REMOTE_ATOMIC), | |
08b48a1e AG |
391 | &pool->fmr_attr); |
392 | if (IS_ERR(ibmr->fmr)) { | |
393 | err = PTR_ERR(ibmr->fmr); | |
394 | ibmr->fmr = NULL; | |
395 | printk(KERN_WARNING "RDS/IB: ib_alloc_fmr failed (err=%d)\n", err); | |
396 | goto out_no_cigar; | |
397 | } | |
398 | ||
06766513 SS |
399 | ibmr->pool = pool; |
400 | if (pool->pool_type == RDS_IB_MR_8K_POOL) | |
401 | rds_ib_stats_inc(s_ib_rdma_mr_8k_alloc); | |
402 | else | |
403 | rds_ib_stats_inc(s_ib_rdma_mr_1m_alloc); | |
404 | ||
08b48a1e AG |
405 | return ibmr; |
406 | ||
407 | out_no_cigar: | |
408 | if (ibmr) { | |
409 | if (ibmr->fmr) | |
410 | ib_dealloc_fmr(ibmr->fmr); | |
411 | kfree(ibmr); | |
412 | } | |
413 | atomic_dec(&pool->item_count); | |
414 | return ERR_PTR(err); | |
415 | } | |
416 | ||
417 | static int rds_ib_map_fmr(struct rds_ib_device *rds_ibdev, struct rds_ib_mr *ibmr, | |
418 | struct scatterlist *sg, unsigned int nents) | |
419 | { | |
420 | struct ib_device *dev = rds_ibdev->dev; | |
421 | struct scatterlist *scat = sg; | |
422 | u64 io_addr = 0; | |
423 | u64 *dma_pages; | |
424 | u32 len; | |
425 | int page_cnt, sg_dma_len; | |
426 | int i, j; | |
427 | int ret; | |
428 | ||
429 | sg_dma_len = ib_dma_map_sg(dev, sg, nents, | |
430 | DMA_BIDIRECTIONAL); | |
431 | if (unlikely(!sg_dma_len)) { | |
432 | printk(KERN_WARNING "RDS/IB: dma_map_sg failed!\n"); | |
433 | return -EBUSY; | |
434 | } | |
435 | ||
436 | len = 0; | |
437 | page_cnt = 0; | |
438 | ||
439 | for (i = 0; i < sg_dma_len; ++i) { | |
440 | unsigned int dma_len = ib_sg_dma_len(dev, &scat[i]); | |
441 | u64 dma_addr = ib_sg_dma_address(dev, &scat[i]); | |
442 | ||
a870d627 | 443 | if (dma_addr & ~PAGE_MASK) { |
08b48a1e AG |
444 | if (i > 0) |
445 | return -EINVAL; | |
446 | else | |
447 | ++page_cnt; | |
448 | } | |
a870d627 | 449 | if ((dma_addr + dma_len) & ~PAGE_MASK) { |
08b48a1e AG |
450 | if (i < sg_dma_len - 1) |
451 | return -EINVAL; | |
452 | else | |
453 | ++page_cnt; | |
454 | } | |
455 | ||
456 | len += dma_len; | |
457 | } | |
458 | ||
a870d627 | 459 | page_cnt += len >> PAGE_SHIFT; |
06766513 | 460 | if (page_cnt > ibmr->pool->fmr_attr.max_pages) |
08b48a1e AG |
461 | return -EINVAL; |
462 | ||
e4c52c98 AG |
463 | dma_pages = kmalloc_node(sizeof(u64) * page_cnt, GFP_ATOMIC, |
464 | rdsibdev_to_node(rds_ibdev)); | |
08b48a1e AG |
465 | if (!dma_pages) |
466 | return -ENOMEM; | |
467 | ||
468 | page_cnt = 0; | |
469 | for (i = 0; i < sg_dma_len; ++i) { | |
470 | unsigned int dma_len = ib_sg_dma_len(dev, &scat[i]); | |
471 | u64 dma_addr = ib_sg_dma_address(dev, &scat[i]); | |
472 | ||
a870d627 | 473 | for (j = 0; j < dma_len; j += PAGE_SIZE) |
08b48a1e | 474 | dma_pages[page_cnt++] = |
a870d627 | 475 | (dma_addr & PAGE_MASK) + j; |
08b48a1e AG |
476 | } |
477 | ||
478 | ret = ib_map_phys_fmr(ibmr->fmr, | |
479 | dma_pages, page_cnt, io_addr); | |
480 | if (ret) | |
481 | goto out; | |
482 | ||
483 | /* Success - we successfully remapped the MR, so we can | |
484 | * safely tear down the old mapping. */ | |
485 | rds_ib_teardown_mr(ibmr); | |
486 | ||
487 | ibmr->sg = scat; | |
488 | ibmr->sg_len = nents; | |
489 | ibmr->sg_dma_len = sg_dma_len; | |
490 | ibmr->remap_count++; | |
491 | ||
06766513 SS |
492 | if (ibmr->pool->pool_type == RDS_IB_MR_8K_POOL) |
493 | rds_ib_stats_inc(s_ib_rdma_mr_8k_used); | |
494 | else | |
495 | rds_ib_stats_inc(s_ib_rdma_mr_1m_used); | |
08b48a1e AG |
496 | ret = 0; |
497 | ||
498 | out: | |
499 | kfree(dma_pages); | |
500 | ||
501 | return ret; | |
502 | } | |
503 | ||
504 | void rds_ib_sync_mr(void *trans_private, int direction) | |
505 | { | |
506 | struct rds_ib_mr *ibmr = trans_private; | |
507 | struct rds_ib_device *rds_ibdev = ibmr->device; | |
508 | ||
509 | switch (direction) { | |
510 | case DMA_FROM_DEVICE: | |
511 | ib_dma_sync_sg_for_cpu(rds_ibdev->dev, ibmr->sg, | |
512 | ibmr->sg_dma_len, DMA_BIDIRECTIONAL); | |
513 | break; | |
514 | case DMA_TO_DEVICE: | |
515 | ib_dma_sync_sg_for_device(rds_ibdev->dev, ibmr->sg, | |
516 | ibmr->sg_dma_len, DMA_BIDIRECTIONAL); | |
517 | break; | |
518 | } | |
519 | } | |
520 | ||
521 | static void __rds_ib_teardown_mr(struct rds_ib_mr *ibmr) | |
522 | { | |
523 | struct rds_ib_device *rds_ibdev = ibmr->device; | |
524 | ||
525 | if (ibmr->sg_dma_len) { | |
526 | ib_dma_unmap_sg(rds_ibdev->dev, | |
527 | ibmr->sg, ibmr->sg_len, | |
528 | DMA_BIDIRECTIONAL); | |
529 | ibmr->sg_dma_len = 0; | |
530 | } | |
531 | ||
532 | /* Release the s/g list */ | |
533 | if (ibmr->sg_len) { | |
534 | unsigned int i; | |
535 | ||
536 | for (i = 0; i < ibmr->sg_len; ++i) { | |
537 | struct page *page = sg_page(&ibmr->sg[i]); | |
538 | ||
539 | /* FIXME we need a way to tell a r/w MR | |
540 | * from a r/o MR */ | |
5c240fa2 | 541 | WARN_ON(!page->mapping && irqs_disabled()); |
08b48a1e AG |
542 | set_page_dirty(page); |
543 | put_page(page); | |
544 | } | |
545 | kfree(ibmr->sg); | |
546 | ||
547 | ibmr->sg = NULL; | |
548 | ibmr->sg_len = 0; | |
549 | } | |
550 | } | |
551 | ||
552 | static void rds_ib_teardown_mr(struct rds_ib_mr *ibmr) | |
553 | { | |
554 | unsigned int pinned = ibmr->sg_len; | |
555 | ||
556 | __rds_ib_teardown_mr(ibmr); | |
557 | if (pinned) { | |
26139dc1 | 558 | struct rds_ib_mr_pool *pool = ibmr->pool; |
08b48a1e AG |
559 | |
560 | atomic_sub(pinned, &pool->free_pinned); | |
561 | } | |
562 | } | |
563 | ||
564 | static inline unsigned int rds_ib_flush_goal(struct rds_ib_mr_pool *pool, int free_all) | |
565 | { | |
566 | unsigned int item_count; | |
567 | ||
568 | item_count = atomic_read(&pool->item_count); | |
569 | if (free_all) | |
570 | return item_count; | |
571 | ||
572 | return 0; | |
573 | } | |
574 | ||
6fa70da6 | 575 | /* |
1bc144b6 | 576 | * given an llist of mrs, put them all into the list_head for more processing |
6fa70da6 | 577 | */ |
6116c203 WW |
578 | static unsigned int llist_append_to_list(struct llist_head *llist, |
579 | struct list_head *list) | |
6fa70da6 CM |
580 | { |
581 | struct rds_ib_mr *ibmr; | |
1bc144b6 HY |
582 | struct llist_node *node; |
583 | struct llist_node *next; | |
6116c203 | 584 | unsigned int count = 0; |
1bc144b6 HY |
585 | |
586 | node = llist_del_all(llist); | |
587 | while (node) { | |
588 | next = node->next; | |
589 | ibmr = llist_entry(node, struct rds_ib_mr, llnode); | |
6fa70da6 | 590 | list_add_tail(&ibmr->unmap_list, list); |
1bc144b6 | 591 | node = next; |
6116c203 | 592 | count++; |
6fa70da6 | 593 | } |
6116c203 | 594 | return count; |
6fa70da6 CM |
595 | } |
596 | ||
597 | /* | |
1bc144b6 HY |
598 | * this takes a list head of mrs and turns it into linked llist nodes |
599 | * of clusters. Each cluster has linked llist nodes of | |
600 | * MR_CLUSTER_SIZE mrs that are ready for reuse. | |
6fa70da6 | 601 | */ |
1bc144b6 HY |
602 | static void list_to_llist_nodes(struct rds_ib_mr_pool *pool, |
603 | struct list_head *list, | |
604 | struct llist_node **nodes_head, | |
605 | struct llist_node **nodes_tail) | |
6fa70da6 CM |
606 | { |
607 | struct rds_ib_mr *ibmr; | |
1bc144b6 HY |
608 | struct llist_node *cur = NULL; |
609 | struct llist_node **next = nodes_head; | |
6fa70da6 CM |
610 | |
611 | list_for_each_entry(ibmr, list, unmap_list) { | |
1bc144b6 HY |
612 | cur = &ibmr->llnode; |
613 | *next = cur; | |
614 | next = &cur->next; | |
6fa70da6 | 615 | } |
1bc144b6 HY |
616 | *next = NULL; |
617 | *nodes_tail = cur; | |
6fa70da6 CM |
618 | } |
619 | ||
08b48a1e AG |
620 | /* |
621 | * Flush our pool of MRs. | |
622 | * At a minimum, all currently unused MRs are unmapped. | |
623 | * If the number of MRs allocated exceeds the limit, we also try | |
624 | * to free as many MRs as needed to get back to this limit. | |
625 | */ | |
6fa70da6 | 626 | static int rds_ib_flush_mr_pool(struct rds_ib_mr_pool *pool, |
06766513 | 627 | int free_all, struct rds_ib_mr **ibmr_ret) |
08b48a1e AG |
628 | { |
629 | struct rds_ib_mr *ibmr, *next; | |
1bc144b6 HY |
630 | struct llist_node *clean_nodes; |
631 | struct llist_node *clean_tail; | |
08b48a1e AG |
632 | LIST_HEAD(unmap_list); |
633 | LIST_HEAD(fmr_list); | |
634 | unsigned long unpinned = 0; | |
6116c203 | 635 | unsigned int nfreed = 0, dirty_to_clean = 0, free_goal; |
08b48a1e AG |
636 | int ret = 0; |
637 | ||
06766513 SS |
638 | if (pool->pool_type == RDS_IB_MR_8K_POOL) |
639 | rds_ib_stats_inc(s_ib_rdma_mr_8k_pool_flush); | |
640 | else | |
641 | rds_ib_stats_inc(s_ib_rdma_mr_1m_pool_flush); | |
08b48a1e | 642 | |
6fa70da6 CM |
643 | if (ibmr_ret) { |
644 | DEFINE_WAIT(wait); | |
06766513 | 645 | while (!mutex_trylock(&pool->flush_lock)) { |
6fa70da6 CM |
646 | ibmr = rds_ib_reuse_fmr(pool); |
647 | if (ibmr) { | |
648 | *ibmr_ret = ibmr; | |
649 | finish_wait(&pool->flush_wait, &wait); | |
650 | goto out_nolock; | |
651 | } | |
652 | ||
653 | prepare_to_wait(&pool->flush_wait, &wait, | |
654 | TASK_UNINTERRUPTIBLE); | |
1bc144b6 | 655 | if (llist_empty(&pool->clean_list)) |
6fa70da6 CM |
656 | schedule(); |
657 | ||
658 | ibmr = rds_ib_reuse_fmr(pool); | |
659 | if (ibmr) { | |
660 | *ibmr_ret = ibmr; | |
661 | finish_wait(&pool->flush_wait, &wait); | |
662 | goto out_nolock; | |
663 | } | |
664 | } | |
665 | finish_wait(&pool->flush_wait, &wait); | |
666 | } else | |
667 | mutex_lock(&pool->flush_lock); | |
668 | ||
669 | if (ibmr_ret) { | |
670 | ibmr = rds_ib_reuse_fmr(pool); | |
671 | if (ibmr) { | |
672 | *ibmr_ret = ibmr; | |
673 | goto out; | |
674 | } | |
675 | } | |
08b48a1e | 676 | |
08b48a1e | 677 | /* Get the list of all MRs to be dropped. Ordering matters - |
6fa70da6 CM |
678 | * we want to put drop_list ahead of free_list. |
679 | */ | |
6116c203 WW |
680 | dirty_to_clean = llist_append_to_list(&pool->drop_list, &unmap_list); |
681 | dirty_to_clean += llist_append_to_list(&pool->free_list, &unmap_list); | |
08b48a1e | 682 | if (free_all) |
1bc144b6 | 683 | llist_append_to_list(&pool->clean_list, &unmap_list); |
08b48a1e AG |
684 | |
685 | free_goal = rds_ib_flush_goal(pool, free_all); | |
686 | ||
687 | if (list_empty(&unmap_list)) | |
688 | goto out; | |
689 | ||
690 | /* String all ib_mr's onto one list and hand them to ib_unmap_fmr */ | |
6fa70da6 | 691 | list_for_each_entry(ibmr, &unmap_list, unmap_list) |
08b48a1e | 692 | list_add(&ibmr->fmr->list, &fmr_list); |
6fa70da6 | 693 | |
08b48a1e AG |
694 | ret = ib_unmap_fmr(&fmr_list); |
695 | if (ret) | |
696 | printk(KERN_WARNING "RDS/IB: ib_unmap_fmr failed (err=%d)\n", ret); | |
697 | ||
698 | /* Now we can destroy the DMA mapping and unpin any pages */ | |
6fa70da6 | 699 | list_for_each_entry_safe(ibmr, next, &unmap_list, unmap_list) { |
08b48a1e AG |
700 | unpinned += ibmr->sg_len; |
701 | __rds_ib_teardown_mr(ibmr); | |
06766513 SS |
702 | if (nfreed < free_goal || |
703 | ibmr->remap_count >= pool->fmr_attr.max_maps) { | |
704 | if (ibmr->pool->pool_type == RDS_IB_MR_8K_POOL) | |
705 | rds_ib_stats_inc(s_ib_rdma_mr_8k_free); | |
706 | else | |
707 | rds_ib_stats_inc(s_ib_rdma_mr_1m_free); | |
6fa70da6 | 708 | list_del(&ibmr->unmap_list); |
08b48a1e AG |
709 | ib_dealloc_fmr(ibmr->fmr); |
710 | kfree(ibmr); | |
711 | nfreed++; | |
712 | } | |
08b48a1e AG |
713 | } |
714 | ||
6fa70da6 CM |
715 | if (!list_empty(&unmap_list)) { |
716 | /* we have to make sure that none of the things we're about | |
717 | * to put on the clean list would race with other cpus trying | |
1bc144b6 | 718 | * to pull items off. The llist would explode if we managed to |
6fa70da6 | 719 | * remove something from the clean list and then add it back again |
1bc144b6 | 720 | * while another CPU was spinning on that same item in llist_del_first. |
6fa70da6 | 721 | * |
1bc144b6 | 722 | * This is pretty unlikely, but just in case wait for an llist grace period |
6fa70da6 CM |
723 | * here before adding anything back into the clean list. |
724 | */ | |
725 | wait_clean_list_grace(); | |
726 | ||
1bc144b6 | 727 | list_to_llist_nodes(pool, &unmap_list, &clean_nodes, &clean_tail); |
6fa70da6 | 728 | if (ibmr_ret) |
1bc144b6 | 729 | *ibmr_ret = llist_entry(clean_nodes, struct rds_ib_mr, llnode); |
6fa70da6 | 730 | |
1bc144b6 HY |
731 | /* more than one entry in llist nodes */ |
732 | if (clean_nodes->next) | |
733 | llist_add_batch(clean_nodes->next, clean_tail, &pool->clean_list); | |
6fa70da6 CM |
734 | |
735 | } | |
08b48a1e AG |
736 | |
737 | atomic_sub(unpinned, &pool->free_pinned); | |
6116c203 | 738 | atomic_sub(dirty_to_clean, &pool->dirty_count); |
08b48a1e AG |
739 | atomic_sub(nfreed, &pool->item_count); |
740 | ||
741 | out: | |
742 | mutex_unlock(&pool->flush_lock); | |
6fa70da6 CM |
743 | if (waitqueue_active(&pool->flush_wait)) |
744 | wake_up(&pool->flush_wait); | |
745 | out_nolock: | |
08b48a1e AG |
746 | return ret; |
747 | } | |
748 | ||
749 | static void rds_ib_mr_pool_flush_worker(struct work_struct *work) | |
750 | { | |
7a0ff5db | 751 | struct rds_ib_mr_pool *pool = container_of(work, struct rds_ib_mr_pool, flush_worker.work); |
08b48a1e | 752 | |
6fa70da6 | 753 | rds_ib_flush_mr_pool(pool, 0, NULL); |
08b48a1e AG |
754 | } |
755 | ||
756 | void rds_ib_free_mr(void *trans_private, int invalidate) | |
757 | { | |
758 | struct rds_ib_mr *ibmr = trans_private; | |
26139dc1 | 759 | struct rds_ib_mr_pool *pool = ibmr->pool; |
08b48a1e | 760 | struct rds_ib_device *rds_ibdev = ibmr->device; |
08b48a1e AG |
761 | |
762 | rdsdebug("RDS/IB: free_mr nents %u\n", ibmr->sg_len); | |
763 | ||
764 | /* Return it to the pool's free list */ | |
08b48a1e | 765 | if (ibmr->remap_count >= pool->fmr_attr.max_maps) |
1bc144b6 | 766 | llist_add(&ibmr->llnode, &pool->drop_list); |
08b48a1e | 767 | else |
1bc144b6 | 768 | llist_add(&ibmr->llnode, &pool->free_list); |
08b48a1e AG |
769 | |
770 | atomic_add(ibmr->sg_len, &pool->free_pinned); | |
771 | atomic_inc(&pool->dirty_count); | |
08b48a1e AG |
772 | |
773 | /* If we've pinned too many pages, request a flush */ | |
f64f9e71 | 774 | if (atomic_read(&pool->free_pinned) >= pool->max_free_pinned || |
ef5217a6 | 775 | atomic_read(&pool->dirty_count) >= pool->max_items / 5) |
ad1d7dc0 | 776 | queue_delayed_work(rds_ib_fmr_wq, &pool->flush_worker, 10); |
08b48a1e AG |
777 | |
778 | if (invalidate) { | |
779 | if (likely(!in_interrupt())) { | |
6fa70da6 | 780 | rds_ib_flush_mr_pool(pool, 0, NULL); |
08b48a1e AG |
781 | } else { |
782 | /* We get here if the user created a MR marked | |
ad1d7dc0 | 783 | * as use_once and invalidate at the same time. |
784 | */ | |
785 | queue_delayed_work(rds_ib_fmr_wq, | |
786 | &pool->flush_worker, 10); | |
08b48a1e AG |
787 | } |
788 | } | |
3e0249f9 ZB |
789 | |
790 | rds_ib_dev_put(rds_ibdev); | |
08b48a1e AG |
791 | } |
792 | ||
793 | void rds_ib_flush_mrs(void) | |
794 | { | |
795 | struct rds_ib_device *rds_ibdev; | |
796 | ||
ea819867 | 797 | down_read(&rds_ib_devices_lock); |
08b48a1e | 798 | list_for_each_entry(rds_ibdev, &rds_ib_devices, list) { |
06766513 SS |
799 | if (rds_ibdev->mr_8k_pool) |
800 | rds_ib_flush_mr_pool(rds_ibdev->mr_8k_pool, 0, NULL); | |
08b48a1e | 801 | |
06766513 SS |
802 | if (rds_ibdev->mr_1m_pool) |
803 | rds_ib_flush_mr_pool(rds_ibdev->mr_1m_pool, 0, NULL); | |
08b48a1e | 804 | } |
ea819867 | 805 | up_read(&rds_ib_devices_lock); |
08b48a1e AG |
806 | } |
807 | ||
808 | void *rds_ib_get_mr(struct scatterlist *sg, unsigned long nents, | |
809 | struct rds_sock *rs, u32 *key_ret) | |
810 | { | |
811 | struct rds_ib_device *rds_ibdev; | |
812 | struct rds_ib_mr *ibmr = NULL; | |
813 | int ret; | |
814 | ||
815 | rds_ibdev = rds_ib_get_device(rs->rs_bound_addr); | |
816 | if (!rds_ibdev) { | |
817 | ret = -ENODEV; | |
818 | goto out; | |
819 | } | |
820 | ||
06766513 | 821 | if (!rds_ibdev->mr_8k_pool || !rds_ibdev->mr_1m_pool) { |
08b48a1e AG |
822 | ret = -ENODEV; |
823 | goto out; | |
824 | } | |
825 | ||
06766513 | 826 | ibmr = rds_ib_alloc_fmr(rds_ibdev, nents); |
4fabb594 WW |
827 | if (IS_ERR(ibmr)) { |
828 | rds_ib_dev_put(rds_ibdev); | |
08b48a1e | 829 | return ibmr; |
4fabb594 | 830 | } |
08b48a1e AG |
831 | |
832 | ret = rds_ib_map_fmr(rds_ibdev, ibmr, sg, nents); | |
833 | if (ret == 0) | |
834 | *key_ret = ibmr->fmr->rkey; | |
835 | else | |
836 | printk(KERN_WARNING "RDS/IB: map_fmr failed (errno=%d)\n", ret); | |
837 | ||
838 | ibmr->device = rds_ibdev; | |
3e0249f9 | 839 | rds_ibdev = NULL; |
08b48a1e AG |
840 | |
841 | out: | |
842 | if (ret) { | |
843 | if (ibmr) | |
844 | rds_ib_free_mr(ibmr, 0); | |
845 | ibmr = ERR_PTR(ret); | |
846 | } | |
3e0249f9 ZB |
847 | if (rds_ibdev) |
848 | rds_ib_dev_put(rds_ibdev); | |
08b48a1e AG |
849 | return ibmr; |
850 | } | |
6fa70da6 | 851 |