xref: /openbmc/linux/drivers/infiniband/hw/mlx4/mr.c (revision 22246614)
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,
136 			       access_flags, 0);
137 	if (IS_ERR(mr->umem)) {
138 		err = PTR_ERR(mr->umem);
139 		goto err_free;
140 	}
141 
142 	n = ib_umem_page_count(mr->umem);
143 	shift = ilog2(mr->umem->page_size);
144 
145 	err = mlx4_mr_alloc(dev->dev, to_mpd(pd)->pdn, virt_addr, length,
146 			    convert_access(access_flags), n, shift, &mr->mmr);
147 	if (err)
148 		goto err_umem;
149 
150 	err = mlx4_ib_umem_write_mtt(dev, &mr->mmr.mtt, mr->umem);
151 	if (err)
152 		goto err_mr;
153 
154 	err = mlx4_mr_enable(dev->dev, &mr->mmr);
155 	if (err)
156 		goto err_mr;
157 
158 	mr->ibmr.rkey = mr->ibmr.lkey = mr->mmr.key;
159 
160 	return &mr->ibmr;
161 
162 err_mr:
163 	mlx4_mr_free(to_mdev(pd->device)->dev, &mr->mmr);
164 
165 err_umem:
166 	ib_umem_release(mr->umem);
167 
168 err_free:
169 	kfree(mr);
170 
171 	return ERR_PTR(err);
172 }
173 
174 int mlx4_ib_dereg_mr(struct ib_mr *ibmr)
175 {
176 	struct mlx4_ib_mr *mr = to_mmr(ibmr);
177 
178 	mlx4_mr_free(to_mdev(ibmr->device)->dev, &mr->mmr);
179 	if (mr->umem)
180 		ib_umem_release(mr->umem);
181 	kfree(mr);
182 
183 	return 0;
184 }
185 
186 struct ib_fmr *mlx4_ib_fmr_alloc(struct ib_pd *pd, int acc,
187 				 struct ib_fmr_attr *fmr_attr)
188 {
189 	struct mlx4_ib_dev *dev = to_mdev(pd->device);
190 	struct mlx4_ib_fmr *fmr;
191 	int err = -ENOMEM;
192 
193 	fmr = kmalloc(sizeof *fmr, GFP_KERNEL);
194 	if (!fmr)
195 		return ERR_PTR(-ENOMEM);
196 
197 	err = mlx4_fmr_alloc(dev->dev, to_mpd(pd)->pdn, convert_access(acc),
198 			     fmr_attr->max_pages, fmr_attr->max_maps,
199 			     fmr_attr->page_shift, &fmr->mfmr);
200 	if (err)
201 		goto err_free;
202 
203 	err = mlx4_fmr_enable(to_mdev(pd->device)->dev, &fmr->mfmr);
204 	if (err)
205 		goto err_mr;
206 
207 	fmr->ibfmr.rkey = fmr->ibfmr.lkey = fmr->mfmr.mr.key;
208 
209 	return &fmr->ibfmr;
210 
211 err_mr:
212 	mlx4_mr_free(to_mdev(pd->device)->dev, &fmr->mfmr.mr);
213 
214 err_free:
215 	kfree(fmr);
216 
217 	return ERR_PTR(err);
218 }
219 
220 int mlx4_ib_map_phys_fmr(struct ib_fmr *ibfmr, u64 *page_list,
221 		      int npages, u64 iova)
222 {
223 	struct mlx4_ib_fmr *ifmr = to_mfmr(ibfmr);
224 	struct mlx4_ib_dev *dev = to_mdev(ifmr->ibfmr.device);
225 
226 	return mlx4_map_phys_fmr(dev->dev, &ifmr->mfmr, page_list, npages, iova,
227 				 &ifmr->ibfmr.lkey, &ifmr->ibfmr.rkey);
228 }
229 
230 int mlx4_ib_unmap_fmr(struct list_head *fmr_list)
231 {
232 	struct ib_fmr *ibfmr;
233 	int err;
234 	struct mlx4_dev *mdev = NULL;
235 
236 	list_for_each_entry(ibfmr, fmr_list, list) {
237 		if (mdev && to_mdev(ibfmr->device)->dev != mdev)
238 			return -EINVAL;
239 		mdev = to_mdev(ibfmr->device)->dev;
240 	}
241 
242 	if (!mdev)
243 		return 0;
244 
245 	list_for_each_entry(ibfmr, fmr_list, list) {
246 		struct mlx4_ib_fmr *ifmr = to_mfmr(ibfmr);
247 
248 		mlx4_fmr_unmap(mdev, &ifmr->mfmr, &ifmr->ibfmr.lkey, &ifmr->ibfmr.rkey);
249 	}
250 
251 	/*
252 	 * Make sure all MPT status updates are visible before issuing
253 	 * SYNC_TPT firmware command.
254 	 */
255 	wmb();
256 
257 	err = mlx4_SYNC_TPT(mdev);
258 	if (err)
259 		printk(KERN_WARNING "mlx4_ib: SYNC_TPT error %d when "
260 		       "unmapping FMRs\n", err);
261 
262 	return 0;
263 }
264 
265 int mlx4_ib_fmr_dealloc(struct ib_fmr *ibfmr)
266 {
267 	struct mlx4_ib_fmr *ifmr = to_mfmr(ibfmr);
268 	struct mlx4_ib_dev *dev = to_mdev(ibfmr->device);
269 	int err;
270 
271 	err = mlx4_fmr_free(dev->dev, &ifmr->mfmr);
272 
273 	if (!err)
274 		kfree(ifmr);
275 
276 	return err;
277 }
278