Linux kernel & device driver programming

Cross-Referenced Linux and Device Driver Code

[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ]
Version: [ 2.6.11.8 ] [ 2.6.25 ] [ 2.6.25.8 ] [ 2.6.31.13 ] Architecture: [ i386 ]
  1 /*
  2  * Copyright (c) 2007 Cisco Systems, Inc. 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 "mlx4_ib.h"
 34 
 35 static u32 convert_access(int acc)
 36 {
 37         return (acc & IB_ACCESS_REMOTE_ATOMIC ? MLX4_PERM_ATOMIC       : 0) |
 38                (acc & IB_ACCESS_REMOTE_WRITE  ? MLX4_PERM_REMOTE_WRITE : 0) |
 39                (acc & IB_ACCESS_REMOTE_READ   ? MLX4_PERM_REMOTE_READ  : 0) |
 40                (acc & IB_ACCESS_LOCAL_WRITE   ? MLX4_PERM_LOCAL_WRITE  : 0) |
 41                MLX4_PERM_LOCAL_READ;
 42 }
 43 
 44 struct ib_mr *mlx4_ib_get_dma_mr(struct ib_pd *pd, int acc)
 45 {
 46         struct mlx4_ib_mr *mr;
 47         int err;
 48 
 49         mr = kmalloc(sizeof *mr, GFP_KERNEL);
 50         if (!mr)
 51                 return ERR_PTR(-ENOMEM);
 52 
 53         err = mlx4_mr_alloc(to_mdev(pd->device)->dev, to_mpd(pd)->pdn, 0,
 54                             ~0ull, convert_access(acc), 0, 0, &mr->mmr);
 55         if (err)
 56                 goto err_free;
 57 
 58         err = mlx4_mr_enable(to_mdev(pd->device)->dev, &mr->mmr);
 59         if (err)
 60                 goto err_mr;
 61 
 62         mr->ibmr.rkey = mr->ibmr.lkey = mr->mmr.key;
 63         mr->umem = NULL;
 64 
 65         return &mr->ibmr;
 66 
 67 err_mr:
 68         mlx4_mr_free(to_mdev(pd->device)->dev, &mr->mmr);
 69 
 70 err_free:
 71         kfree(mr);
 72 
 73         return ERR_PTR(err);
 74 }
 75 
 76 int mlx4_ib_umem_write_mtt(struct mlx4_ib_dev *dev, struct mlx4_mtt *mtt,
 77                            struct ib_umem *umem)
 78 {
 79         u64 *pages;
 80         struct ib_umem_chunk *chunk;
 81         int i, j, k;
 82         int n;
 83         int len;
 84         int err = 0;
 85 
 86         pages = (u64 *) __get_free_page(GFP_KERNEL);
 87         if (!pages)
 88                 return -ENOMEM;
 89 
 90         i = n = 0;
 91 
 92         list_for_each_entry(chunk, &umem->chunk_list, list)
 93                 for (j = 0; j < chunk->nmap; ++j) {
 94                         len = sg_dma_len(&chunk->page_list[j]) >> mtt->page_shift;
 95                         for (k = 0; k < len; ++k) {
 96                                 pages[i++] = sg_dma_address(&chunk->page_list[j]) +
 97                                         umem->page_size * k;
 98                                 /*
 99                                  * Be friendly to mlx4_write_mtt() and
100                                  * pass it chunks of appropriate size.
101                                  */
102                                 if (i == PAGE_SIZE / sizeof (u64)) {
103                                         err = mlx4_write_mtt(dev->dev, mtt, n,
104                                                              i, pages);
105                                         if (err)
106                                                 goto out;
107                                         n += i;
108                                         i = 0;
109                                 }
110                         }
111                 }
112 
113         if (i)
114                 err = mlx4_write_mtt(dev->dev, mtt, n, i, pages);
115 
116 out:
117         free_page((unsigned long) pages);
118         return err;
119 }
120 
121 struct ib_mr *mlx4_ib_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
122                                   u64 virt_addr, int access_flags,
123                                   struct ib_udata *udata)
124 {
125         struct mlx4_ib_dev *dev = to_mdev(pd->device);
126         struct mlx4_ib_mr *mr;
127         int shift;
128         int err;
129         int n;
130 
131         mr = kmalloc(sizeof *mr, GFP_KERNEL);
132         if (!mr)
133                 return ERR_PTR(-ENOMEM);
134 
135         mr->umem = ib_umem_get(pd->uobject->context, start, length, access_flags);
136         if (IS_ERR(mr->umem)) {
137                 err = PTR_ERR(mr->umem);
138                 goto err_free;
139         }
140 
141         n = ib_umem_page_count(mr->umem);
142         shift = ilog2(mr->umem->page_size);
143 
144         err = mlx4_mr_alloc(dev->dev, to_mpd(pd)->pdn, virt_addr, length,
145                             convert_access(access_flags), n, shift, &mr->mmr);
146         if (err)
147                 goto err_umem;
148 
149         err = mlx4_ib_umem_write_mtt(dev, &mr->mmr.mtt, mr->umem);
150         if (err)
151                 goto err_mr;
152 
153         err = mlx4_mr_enable(dev->dev, &mr->mmr);
154         if (err)
155                 goto err_mr;
156 
157         mr->ibmr.rkey = mr->ibmr.lkey = mr->mmr.key;
158 
159         return &mr->ibmr;
160 
161 err_mr:
162         mlx4_mr_free(to_mdev(pd->device)->dev, &mr->mmr);
163 
164 err_umem:
165         ib_umem_release(mr->umem);
166 
167 err_free:
168         kfree(mr);
169 
170         return ERR_PTR(err);
171 }
172 
173 int mlx4_ib_dereg_mr(struct ib_mr *ibmr)
174 {
175         struct mlx4_ib_mr *mr = to_mmr(ibmr);
176 
177         mlx4_mr_free(to_mdev(ibmr->device)->dev, &mr->mmr);
178         if (mr->umem)
179                 ib_umem_release(mr->umem);
180         kfree(mr);
181 
182         return 0;
183 }
184 
185 struct ib_fmr *mlx4_ib_fmr_alloc(struct ib_pd *pd, int acc,
186                                  struct ib_fmr_attr *fmr_attr)
187 {
188         struct mlx4_ib_dev *dev = to_mdev(pd->device);
189         struct mlx4_ib_fmr *fmr;
190         int err = -ENOMEM;
191 
192         fmr = kmalloc(sizeof *fmr, GFP_KERNEL);
193         if (!fmr)
194                 return ERR_PTR(-ENOMEM);
195 
196         err = mlx4_fmr_alloc(dev->dev, to_mpd(pd)->pdn, convert_access(acc),
197                              fmr_attr->max_pages, fmr_attr->max_maps,
198                              fmr_attr->page_shift, &fmr->mfmr);
199         if (err)
200                 goto err_free;
201 
202         err = mlx4_fmr_enable(to_mdev(pd->device)->dev, &fmr->mfmr);
203         if (err)
204                 goto err_mr;
205 
206         fmr->ibfmr.rkey = fmr->ibfmr.lkey = fmr->mfmr.mr.key;
207 
208         return &fmr->ibfmr;
209 
210 err_mr:
211         mlx4_mr_free(to_mdev(pd->device)->dev, &fmr->mfmr.mr);
212 
213 err_free:
214         kfree(fmr);
215 
216         return ERR_PTR(err);
217 }
218 
219 int mlx4_ib_map_phys_fmr(struct ib_fmr *ibfmr, u64 *page_list,
220                       int npages, u64 iova)
221 {
222         struct mlx4_ib_fmr *ifmr = to_mfmr(ibfmr);
223         struct mlx4_ib_dev *dev = to_mdev(ifmr->ibfmr.device);
224 
225         return mlx4_map_phys_fmr(dev->dev, &ifmr->mfmr, page_list, npages, iova,
226                                  &ifmr->ibfmr.lkey, &ifmr->ibfmr.rkey);
227 }
228 
229 int mlx4_ib_unmap_fmr(struct list_head *fmr_list)
230 {
231         struct ib_fmr *ibfmr;
232         int err;
233         struct mlx4_dev *mdev = NULL;
234 
235         list_for_each_entry(ibfmr, fmr_list, list) {
236                 if (mdev && to_mdev(ibfmr->device)->dev != mdev)
237                         return -EINVAL;
238                 mdev = to_mdev(ibfmr->device)->dev;
239         }
240 
241         if (!mdev)
242                 return 0;
243 
244         list_for_each_entry(ibfmr, fmr_list, list) {
245                 struct mlx4_ib_fmr *ifmr = to_mfmr(ibfmr);
246 
247                 mlx4_fmr_unmap(mdev, &ifmr->mfmr, &ifmr->ibfmr.lkey, &ifmr->ibfmr.rkey);
248         }
249 
250         /*
251          * Make sure all MPT status updates are visible before issuing
252          * SYNC_TPT firmware command.
253          */
254         wmb();
255 
256         err = mlx4_SYNC_TPT(mdev);
257         if (err)
258                 printk(KERN_WARNING "mlx4_ib: SYNC_TPT error %d when "
259                        "unmapping FMRs\n", err);
260 
261         return 0;
262 }
263 
264 int mlx4_ib_fmr_dealloc(struct ib_fmr *ibfmr)
265 {
266         struct mlx4_ib_fmr *ifmr = to_mfmr(ibfmr);
267         struct mlx4_ib_dev *dev = to_mdev(ibfmr->device);
268         int err;
269 
270         err = mlx4_fmr_free(dev->dev, &ifmr->mfmr);
271 
272         if (!err)
273                 kfree(ifmr);
274 
275         return err;
276 }
277 
  This page was automatically generated by the LXR engine.