tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
35struct 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
80out_no_cigar:
81 kfree(ibmr);
82 atomic_dec(&pool->item_count);
83
84 return ERR_PTR(err);
85}
86
87static 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
181out:
182 kfree(dma_pages);
183
184 return ret;
185}
186
187struct 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
211void 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
250void 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}