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f6df683f | 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; | |
a69365a3 | 39 | struct rds_ib_fmr *fmr; |
490ea596 | 40 | int err = 0; |
f6df683f | 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 | ||
490ea596 | 47 | ibmr = rds_ib_try_reuse_ibmr(pool); |
48 | if (ibmr) | |
49 | return ibmr; | |
f6df683f | 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 | ||
a69365a3 | 58 | fmr = &ibmr->u.fmr; |
59 | fmr->fmr = ib_alloc_fmr(rds_ibdev->pd, | |
f6df683f | 60 | (IB_ACCESS_LOCAL_WRITE | |
61 | IB_ACCESS_REMOTE_READ | | |
62 | IB_ACCESS_REMOTE_WRITE | | |
63 | IB_ACCESS_REMOTE_ATOMIC), | |
64 | &pool->fmr_attr); | |
a69365a3 | 65 | if (IS_ERR(fmr->fmr)) { |
66 | err = PTR_ERR(fmr->fmr); | |
67 | fmr->fmr = NULL; | |
f6df683f | 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 | if (ibmr) { | |
a69365a3 | 82 | if (fmr->fmr) |
83 | ib_dealloc_fmr(fmr->fmr); | |
f6df683f | 84 | kfree(ibmr); |
85 | } | |
86 | atomic_dec(&pool->item_count); | |
87 | return ERR_PTR(err); | |
88 | } | |
89 | ||
90 | int rds_ib_map_fmr(struct rds_ib_device *rds_ibdev, struct rds_ib_mr *ibmr, | |
91 | struct scatterlist *sg, unsigned int nents) | |
92 | { | |
93 | struct ib_device *dev = rds_ibdev->dev; | |
a69365a3 | 94 | struct rds_ib_fmr *fmr = &ibmr->u.fmr; |
f6df683f | 95 | struct scatterlist *scat = sg; |
96 | u64 io_addr = 0; | |
97 | u64 *dma_pages; | |
98 | u32 len; | |
99 | int page_cnt, sg_dma_len; | |
100 | int i, j; | |
101 | int ret; | |
102 | ||
103 | sg_dma_len = ib_dma_map_sg(dev, sg, nents, DMA_BIDIRECTIONAL); | |
104 | if (unlikely(!sg_dma_len)) { | |
105 | pr_warn("RDS/IB: %s failed!\n", __func__); | |
106 | return -EBUSY; | |
107 | } | |
108 | ||
109 | len = 0; | |
110 | page_cnt = 0; | |
111 | ||
112 | for (i = 0; i < sg_dma_len; ++i) { | |
113 | unsigned int dma_len = ib_sg_dma_len(dev, &scat[i]); | |
114 | u64 dma_addr = ib_sg_dma_address(dev, &scat[i]); | |
115 | ||
116 | if (dma_addr & ~PAGE_MASK) { | |
117 | if (i > 0) | |
118 | return -EINVAL; | |
119 | else | |
120 | ++page_cnt; | |
121 | } | |
122 | if ((dma_addr + dma_len) & ~PAGE_MASK) { | |
123 | if (i < sg_dma_len - 1) | |
124 | return -EINVAL; | |
125 | else | |
126 | ++page_cnt; | |
127 | } | |
128 | ||
129 | len += dma_len; | |
130 | } | |
131 | ||
132 | page_cnt += len >> PAGE_SHIFT; | |
133 | if (page_cnt > ibmr->pool->fmr_attr.max_pages) | |
134 | return -EINVAL; | |
135 | ||
136 | dma_pages = kmalloc_node(sizeof(u64) * page_cnt, GFP_ATOMIC, | |
137 | rdsibdev_to_node(rds_ibdev)); | |
138 | if (!dma_pages) | |
139 | return -ENOMEM; | |
140 | ||
141 | page_cnt = 0; | |
142 | for (i = 0; i < sg_dma_len; ++i) { | |
143 | unsigned int dma_len = ib_sg_dma_len(dev, &scat[i]); | |
144 | u64 dma_addr = ib_sg_dma_address(dev, &scat[i]); | |
145 | ||
146 | for (j = 0; j < dma_len; j += PAGE_SIZE) | |
147 | dma_pages[page_cnt++] = | |
148 | (dma_addr & PAGE_MASK) + j; | |
149 | } | |
150 | ||
a69365a3 | 151 | ret = ib_map_phys_fmr(fmr->fmr, dma_pages, page_cnt, io_addr); |
f6df683f | 152 | if (ret) |
153 | goto out; | |
154 | ||
155 | /* Success - we successfully remapped the MR, so we can | |
156 | * safely tear down the old mapping. | |
157 | */ | |
158 | rds_ib_teardown_mr(ibmr); | |
159 | ||
160 | ibmr->sg = scat; | |
161 | ibmr->sg_len = nents; | |
162 | ibmr->sg_dma_len = sg_dma_len; | |
163 | ibmr->remap_count++; | |
164 | ||
165 | if (ibmr->pool->pool_type == RDS_IB_MR_8K_POOL) | |
166 | rds_ib_stats_inc(s_ib_rdma_mr_8k_used); | |
167 | else | |
168 | rds_ib_stats_inc(s_ib_rdma_mr_1m_used); | |
169 | ret = 0; | |
170 | ||
171 | out: | |
172 | kfree(dma_pages); | |
173 | ||
174 | return ret; | |
175 | } | |
490ea596 | 176 | |
177 | struct rds_ib_mr *rds_ib_reg_fmr(struct rds_ib_device *rds_ibdev, | |
178 | struct scatterlist *sg, | |
179 | unsigned long nents, | |
180 | u32 *key) | |
181 | { | |
182 | struct rds_ib_mr *ibmr = NULL; | |
183 | struct rds_ib_fmr *fmr; | |
184 | int ret; | |
185 | ||
186 | ibmr = rds_ib_alloc_fmr(rds_ibdev, nents); | |
187 | if (IS_ERR(ibmr)) | |
188 | return ibmr; | |
189 | ||
190 | ibmr->device = rds_ibdev; | |
191 | fmr = &ibmr->u.fmr; | |
192 | ret = rds_ib_map_fmr(rds_ibdev, ibmr, sg, nents); | |
193 | if (ret == 0) | |
194 | *key = fmr->fmr->rkey; | |
195 | else | |
196 | rds_ib_free_mr(ibmr, 0); | |
197 | ||
198 | return ibmr; | |
199 | } | |
200 | ||
201 | void rds_ib_unreg_fmr(struct list_head *list, unsigned int *nfreed, | |
202 | unsigned long *unpinned, unsigned int goal) | |
203 | { | |
204 | struct rds_ib_mr *ibmr, *next; | |
205 | struct rds_ib_fmr *fmr; | |
206 | LIST_HEAD(fmr_list); | |
207 | int ret = 0; | |
208 | unsigned int freed = *nfreed; | |
209 | ||
210 | /* String all ib_mr's onto one list and hand them to ib_unmap_fmr */ | |
211 | list_for_each_entry(ibmr, list, unmap_list) { | |
212 | fmr = &ibmr->u.fmr; | |
213 | list_add(&fmr->fmr->list, &fmr_list); | |
214 | } | |
215 | ||
216 | ret = ib_unmap_fmr(&fmr_list); | |
217 | if (ret) | |
218 | pr_warn("RDS/IB: FMR invalidation failed (err=%d)\n", ret); | |
219 | ||
220 | /* Now we can destroy the DMA mapping and unpin any pages */ | |
221 | list_for_each_entry_safe(ibmr, next, list, unmap_list) { | |
222 | fmr = &ibmr->u.fmr; | |
223 | *unpinned += ibmr->sg_len; | |
224 | __rds_ib_teardown_mr(ibmr); | |
225 | if (freed < goal || | |
226 | ibmr->remap_count >= ibmr->pool->fmr_attr.max_maps) { | |
227 | if (ibmr->pool->pool_type == RDS_IB_MR_8K_POOL) | |
228 | rds_ib_stats_inc(s_ib_rdma_mr_8k_free); | |
229 | else | |
230 | rds_ib_stats_inc(s_ib_rdma_mr_1m_free); | |
231 | list_del(&ibmr->unmap_list); | |
232 | ib_dealloc_fmr(fmr->fmr); | |
233 | kfree(ibmr); | |
234 | freed++; | |
235 | } | |
236 | } | |
237 | *nfreed = freed; | |
238 | } | |
239 | ||
240 | void rds_ib_free_fmr_list(struct rds_ib_mr *ibmr) | |
241 | { | |
242 | struct rds_ib_mr_pool *pool = ibmr->pool; | |
243 | ||
244 | if (ibmr->remap_count >= pool->fmr_attr.max_maps) | |
245 | llist_add(&ibmr->llnode, &pool->drop_list); | |
246 | else | |
247 | llist_add(&ibmr->llnode, &pool->free_list); | |
248 | } |