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TOMOYO Linux Cross Reference
Linux/net/rds/ib_fmr.c

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  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         if (ibmr) {
 82                 if (fmr->fmr)
 83                         ib_dealloc_fmr(fmr->fmr);
 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;
 94         struct rds_ib_fmr *fmr = &ibmr->u.fmr;
 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 
151         ret = ib_map_phys_fmr(fmr->fmr, dma_pages, page_cnt, io_addr);
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 }
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 }
249 

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