net/rds/ib_fmr.c: use kmalloc_array_node()
[sfrench/cifs-2.6.git] / net / rds / ib_fmr.c
1 /*
2  * Copyright (c) 2016 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 "ib_mr.h"
34
35 struct rds_ib_mr *rds_ib_alloc_fmr(struct rds_ib_device *rds_ibdev, int npages)
36 {
37         struct rds_ib_mr_pool *pool;
38         struct rds_ib_mr *ibmr = NULL;
39         struct rds_ib_fmr *fmr;
40         int err = 0;
41
42         if (npages <= RDS_MR_8K_MSG_SIZE)
43                 pool = rds_ibdev->mr_8k_pool;
44         else
45                 pool = rds_ibdev->mr_1m_pool;
46
47         ibmr = rds_ib_try_reuse_ibmr(pool);
48         if (ibmr)
49                 return ibmr;
50
51         ibmr = kzalloc_node(sizeof(*ibmr), GFP_KERNEL,
52                             rdsibdev_to_node(rds_ibdev));
53         if (!ibmr) {
54                 err = -ENOMEM;
55                 goto out_no_cigar;
56         }
57
58         fmr = &ibmr->u.fmr;
59         fmr->fmr = ib_alloc_fmr(rds_ibdev->pd,
60                         (IB_ACCESS_LOCAL_WRITE |
61                          IB_ACCESS_REMOTE_READ |
62                          IB_ACCESS_REMOTE_WRITE |
63                          IB_ACCESS_REMOTE_ATOMIC),
64                         &pool->fmr_attr);
65         if (IS_ERR(fmr->fmr)) {
66                 err = PTR_ERR(fmr->fmr);
67                 fmr->fmr = NULL;
68                 pr_warn("RDS/IB: %s failed (err=%d)\n", __func__, err);
69                 goto out_no_cigar;
70         }
71
72         ibmr->pool = pool;
73         if (pool->pool_type == RDS_IB_MR_8K_POOL)
74                 rds_ib_stats_inc(s_ib_rdma_mr_8k_alloc);
75         else
76                 rds_ib_stats_inc(s_ib_rdma_mr_1m_alloc);
77
78         return ibmr;
79
80 out_no_cigar:
81         kfree(ibmr);
82         atomic_dec(&pool->item_count);
83
84         return ERR_PTR(err);
85 }
86
87 static int rds_ib_map_fmr(struct rds_ib_device *rds_ibdev,
88                           struct rds_ib_mr *ibmr, struct scatterlist *sg,
89                           unsigned int nents)
90 {
91         struct ib_device *dev = rds_ibdev->dev;
92         struct rds_ib_fmr *fmr = &ibmr->u.fmr;
93         struct scatterlist *scat = sg;
94         u64 io_addr = 0;
95         u64 *dma_pages;
96         u32 len;
97         int page_cnt, sg_dma_len;
98         int i, j;
99         int ret;
100
101         sg_dma_len = ib_dma_map_sg(dev, sg, nents, DMA_BIDIRECTIONAL);
102         if (unlikely(!sg_dma_len)) {
103                 pr_warn("RDS/IB: %s failed!\n", __func__);
104                 return -EBUSY;
105         }
106
107         len = 0;
108         page_cnt = 0;
109
110         for (i = 0; i < sg_dma_len; ++i) {
111                 unsigned int dma_len = ib_sg_dma_len(dev, &scat[i]);
112                 u64 dma_addr = ib_sg_dma_address(dev, &scat[i]);
113
114                 if (dma_addr & ~PAGE_MASK) {
115                         if (i > 0) {
116                                 ib_dma_unmap_sg(dev, sg, nents,
117                                                 DMA_BIDIRECTIONAL);
118                                 return -EINVAL;
119                         } else {
120                                 ++page_cnt;
121                         }
122                 }
123                 if ((dma_addr + dma_len) & ~PAGE_MASK) {
124                         if (i < sg_dma_len - 1) {
125                                 ib_dma_unmap_sg(dev, sg, nents,
126                                                 DMA_BIDIRECTIONAL);
127                                 return -EINVAL;
128                         } else {
129                                 ++page_cnt;
130                         }
131                 }
132
133                 len += dma_len;
134         }
135
136         page_cnt += len >> PAGE_SHIFT;
137         if (page_cnt > ibmr->pool->fmr_attr.max_pages) {
138                 ib_dma_unmap_sg(dev, sg, nents, DMA_BIDIRECTIONAL);
139                 return -EINVAL;
140         }
141
142         dma_pages = kmalloc_array_node(sizeof(u64), page_cnt, GFP_ATOMIC,
143                                        rdsibdev_to_node(rds_ibdev));
144         if (!dma_pages) {
145                 ib_dma_unmap_sg(dev, sg, nents, DMA_BIDIRECTIONAL);
146                 return -ENOMEM;
147         }
148
149         page_cnt = 0;
150         for (i = 0; i < sg_dma_len; ++i) {
151                 unsigned int dma_len = ib_sg_dma_len(dev, &scat[i]);
152                 u64 dma_addr = ib_sg_dma_address(dev, &scat[i]);
153
154                 for (j = 0; j < dma_len; j += PAGE_SIZE)
155                         dma_pages[page_cnt++] =
156                                 (dma_addr & PAGE_MASK) + j;
157         }
158
159         ret = ib_map_phys_fmr(fmr->fmr, dma_pages, page_cnt, io_addr);
160         if (ret) {
161                 ib_dma_unmap_sg(dev, sg, nents, DMA_BIDIRECTIONAL);
162                 goto out;
163         }
164
165         /* Success - we successfully remapped the MR, so we can
166          * safely tear down the old mapping.
167          */
168         rds_ib_teardown_mr(ibmr);
169
170         ibmr->sg = scat;
171         ibmr->sg_len = nents;
172         ibmr->sg_dma_len = sg_dma_len;
173         ibmr->remap_count++;
174
175         if (ibmr->pool->pool_type == RDS_IB_MR_8K_POOL)
176                 rds_ib_stats_inc(s_ib_rdma_mr_8k_used);
177         else
178                 rds_ib_stats_inc(s_ib_rdma_mr_1m_used);
179         ret = 0;
180
181 out:
182         kfree(dma_pages);
183
184         return ret;
185 }
186
187 struct rds_ib_mr *rds_ib_reg_fmr(struct rds_ib_device *rds_ibdev,
188                                  struct scatterlist *sg,
189                                  unsigned long nents,
190                                  u32 *key)
191 {
192         struct rds_ib_mr *ibmr = NULL;
193         struct rds_ib_fmr *fmr;
194         int ret;
195
196         ibmr = rds_ib_alloc_fmr(rds_ibdev, nents);
197         if (IS_ERR(ibmr))
198                 return ibmr;
199
200         ibmr->device = rds_ibdev;
201         fmr = &ibmr->u.fmr;
202         ret = rds_ib_map_fmr(rds_ibdev, ibmr, sg, nents);
203         if (ret == 0)
204                 *key = fmr->fmr->rkey;
205         else
206                 rds_ib_free_mr(ibmr, 0);
207
208         return ibmr;
209 }
210
211 void rds_ib_unreg_fmr(struct list_head *list, unsigned int *nfreed,
212                       unsigned long *unpinned, unsigned int goal)
213 {
214         struct rds_ib_mr *ibmr, *next;
215         struct rds_ib_fmr *fmr;
216         LIST_HEAD(fmr_list);
217         int ret = 0;
218         unsigned int freed = *nfreed;
219
220         /* String all ib_mr's onto one list and hand them to  ib_unmap_fmr */
221         list_for_each_entry(ibmr, list, unmap_list) {
222                 fmr = &ibmr->u.fmr;
223                 list_add(&fmr->fmr->list, &fmr_list);
224         }
225
226         ret = ib_unmap_fmr(&fmr_list);
227         if (ret)
228                 pr_warn("RDS/IB: FMR invalidation failed (err=%d)\n", ret);
229
230         /* Now we can destroy the DMA mapping and unpin any pages */
231         list_for_each_entry_safe(ibmr, next, list, unmap_list) {
232                 fmr = &ibmr->u.fmr;
233                 *unpinned += ibmr->sg_len;
234                 __rds_ib_teardown_mr(ibmr);
235                 if (freed < goal ||
236                     ibmr->remap_count >= ibmr->pool->fmr_attr.max_maps) {
237                         if (ibmr->pool->pool_type == RDS_IB_MR_8K_POOL)
238                                 rds_ib_stats_inc(s_ib_rdma_mr_8k_free);
239                         else
240                                 rds_ib_stats_inc(s_ib_rdma_mr_1m_free);
241                         list_del(&ibmr->unmap_list);
242                         ib_dealloc_fmr(fmr->fmr);
243                         kfree(ibmr);
244                         freed++;
245                 }
246         }
247         *nfreed = freed;
248 }
249
250 void rds_ib_free_fmr_list(struct rds_ib_mr *ibmr)
251 {
252         struct rds_ib_mr_pool *pool = ibmr->pool;
253
254         if (ibmr->remap_count >= pool->fmr_attr.max_maps)
255                 llist_add(&ibmr->llnode, &pool->drop_list);
256         else
257                 llist_add(&ibmr->llnode, &pool->free_list);
258 }