1/*
2 * Copyright (c) 2007 Cisco Systems, Inc. All rights reserved.
3 * Copyright (c) 2007, 2008 Mellanox Technologies. All rights reserved.
4 *
5 * This software is available to you under a choice of one of two
6 * licenses.  You may choose to be licensed under the terms of the GNU
7 * General Public License (GPL) Version 2, available from the file
8 * COPYING in the main directory of this source tree, or the
9 * OpenIB.org BSD license below:
10 *
11 *     Redistribution and use in source and binary forms, with or
12 *     without modification, are permitted provided that the following
13 *     conditions are met:
14 *
15 *      - Redistributions of source code must retain the above
16 *        copyright notice, this list of conditions and the following
17 *        disclaimer.
18 *
19 *      - Redistributions in binary form must reproduce the above
20 *        copyright notice, this list of conditions and the following
21 *        disclaimer in the documentation and/or other materials
22 *        provided with the distribution.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31 * SOFTWARE.
32 */
33
34#include <linux/slab.h>
35
36#include "mlx4_ib.h"
37
38static u32 convert_access(int acc)
39{
40	return (acc & IB_ACCESS_REMOTE_ATOMIC ? MLX4_PERM_ATOMIC       : 0) |
41	       (acc & IB_ACCESS_REMOTE_WRITE  ? MLX4_PERM_REMOTE_WRITE : 0) |
42	       (acc & IB_ACCESS_REMOTE_READ   ? MLX4_PERM_REMOTE_READ  : 0) |
43	       (acc & IB_ACCESS_LOCAL_WRITE   ? MLX4_PERM_LOCAL_WRITE  : 0) |
44	       MLX4_PERM_LOCAL_READ;
45}
46
47struct ib_mr *mlx4_ib_get_dma_mr(struct ib_pd *pd, int acc)
48{
49	struct mlx4_ib_mr *mr;
50	int err;
51
52	mr = kmalloc(sizeof *mr, GFP_KERNEL);
53	if (!mr)
54		return ERR_PTR(-ENOMEM);
55
56	err = mlx4_mr_alloc(to_mdev(pd->device)->dev, to_mpd(pd)->pdn, 0,
57			    ~0ull, convert_access(acc), 0, 0, &mr->mmr);
58	if (err)
59		goto err_free;
60
61	err = mlx4_mr_enable(to_mdev(pd->device)->dev, &mr->mmr);
62	if (err)
63		goto err_mr;
64
65	mr->ibmr.rkey = mr->ibmr.lkey = mr->mmr.key;
66	mr->umem = NULL;
67
68	return &mr->ibmr;
69
70err_mr:
71	mlx4_mr_free(to_mdev(pd->device)->dev, &mr->mmr);
72
73err_free:
74	kfree(mr);
75
76	return ERR_PTR(err);
77}
78
79int mlx4_ib_umem_write_mtt(struct mlx4_ib_dev *dev, struct mlx4_mtt *mtt,
80			   struct ib_umem *umem)
81{
82	u64 *pages;
83	struct ib_umem_chunk *chunk;
84	int i, j, k;
85	int n;
86	int len;
87	int err = 0;
88
89	pages = (u64 *) __get_free_page(GFP_KERNEL);
90	if (!pages)
91		return -ENOMEM;
92
93	i = n = 0;
94
95	list_for_each_entry(chunk, &umem->chunk_list, list)
96		for (j = 0; j < chunk->nmap; ++j) {
97			len = sg_dma_len(&chunk->page_list[j]) >> mtt->page_shift;
98			for (k = 0; k < len; ++k) {
99				pages[i++] = sg_dma_address(&chunk->page_list[j]) +
100					umem->page_size * k;
101				/*
102				 * Be friendly to mlx4_write_mtt() and
103				 * pass it chunks of appropriate size.
104				 */
105				if (i == PAGE_SIZE / sizeof (u64)) {
106					err = mlx4_write_mtt(dev->dev, mtt, n,
107							     i, pages);
108					if (err)
109						goto out;
110					n += i;
111					i = 0;
112				}
113			}
114		}
115
116	if (i)
117		err = mlx4_write_mtt(dev->dev, mtt, n, i, pages);
118
119out:
120	free_page((unsigned long) pages);
121	return err;
122}
123
124struct ib_mr *mlx4_ib_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
125				  u64 virt_addr, int access_flags,
126				  struct ib_udata *udata)
127{
128	struct mlx4_ib_dev *dev = to_mdev(pd->device);
129	struct mlx4_ib_mr *mr;
130	int shift;
131	int err;
132	int n;
133
134	mr = kmalloc(sizeof *mr, GFP_KERNEL);
135	if (!mr)
136		return ERR_PTR(-ENOMEM);
137
138	mr->umem = ib_umem_get(pd->uobject->context, start, length,
139			       access_flags, 0);
140	if (IS_ERR(mr->umem)) {
141		err = PTR_ERR(mr->umem);
142		goto err_free;
143	}
144
145	n = ib_umem_page_count(mr->umem);
146	shift = ilog2(mr->umem->page_size);
147
148	err = mlx4_mr_alloc(dev->dev, to_mpd(pd)->pdn, virt_addr, length,
149			    convert_access(access_flags), n, shift, &mr->mmr);
150	if (err)
151		goto err_umem;
152
153	err = mlx4_ib_umem_write_mtt(dev, &mr->mmr.mtt, mr->umem);
154	if (err)
155		goto err_mr;
156
157	err = mlx4_mr_enable(dev->dev, &mr->mmr);
158	if (err)
159		goto err_mr;
160
161	mr->ibmr.rkey = mr->ibmr.lkey = mr->mmr.key;
162
163	return &mr->ibmr;
164
165err_mr:
166	mlx4_mr_free(to_mdev(pd->device)->dev, &mr->mmr);
167
168err_umem:
169	ib_umem_release(mr->umem);
170
171err_free:
172	kfree(mr);
173
174	return ERR_PTR(err);
175}
176
177int mlx4_ib_dereg_mr(struct ib_mr *ibmr)
178{
179	struct mlx4_ib_mr *mr = to_mmr(ibmr);
180
181	mlx4_mr_free(to_mdev(ibmr->device)->dev, &mr->mmr);
182	if (mr->umem)
183		ib_umem_release(mr->umem);
184	kfree(mr);
185
186	return 0;
187}
188
189struct ib_mr *mlx4_ib_alloc_fast_reg_mr(struct ib_pd *pd,
190					int max_page_list_len)
191{
192	struct mlx4_ib_dev *dev = to_mdev(pd->device);
193	struct mlx4_ib_mr *mr;
194	int err;
195
196	mr = kmalloc(sizeof *mr, GFP_KERNEL);
197	if (!mr)
198		return ERR_PTR(-ENOMEM);
199
200	err = mlx4_mr_alloc(dev->dev, to_mpd(pd)->pdn, 0, 0, 0,
201			    max_page_list_len, 0, &mr->mmr);
202	if (err)
203		goto err_free;
204
205	err = mlx4_mr_enable(dev->dev, &mr->mmr);
206	if (err)
207		goto err_mr;
208
209	mr->ibmr.rkey = mr->ibmr.lkey = mr->mmr.key;
210	mr->umem = NULL;
211
212	return &mr->ibmr;
213
214err_mr:
215	mlx4_mr_free(dev->dev, &mr->mmr);
216
217err_free:
218	kfree(mr);
219	return ERR_PTR(err);
220}
221
222struct ib_fast_reg_page_list *mlx4_ib_alloc_fast_reg_page_list(struct ib_device *ibdev,
223							       int page_list_len)
224{
225	struct mlx4_ib_dev *dev = to_mdev(ibdev);
226	struct mlx4_ib_fast_reg_page_list *mfrpl;
227	int size = page_list_len * sizeof (u64);
228
229	if (page_list_len > MLX4_MAX_FAST_REG_PAGES)
230		return ERR_PTR(-EINVAL);
231
232	mfrpl = kmalloc(sizeof *mfrpl, GFP_KERNEL);
233	if (!mfrpl)
234		return ERR_PTR(-ENOMEM);
235
236	mfrpl->ibfrpl.page_list = kmalloc(size, GFP_KERNEL);
237	if (!mfrpl->ibfrpl.page_list)
238		goto err_free;
239
240	mfrpl->mapped_page_list = dma_alloc_coherent(&dev->dev->pdev->dev,
241						     size, &mfrpl->map,
242						     GFP_KERNEL);
243	if (!mfrpl->mapped_page_list)
244		goto err_free;
245
246	WARN_ON(mfrpl->map & 0x3f);
247
248	return &mfrpl->ibfrpl;
249
250err_free:
251	kfree(mfrpl->ibfrpl.page_list);
252	kfree(mfrpl);
253	return ERR_PTR(-ENOMEM);
254}
255
256void mlx4_ib_free_fast_reg_page_list(struct ib_fast_reg_page_list *page_list)
257{
258	struct mlx4_ib_dev *dev = to_mdev(page_list->device);
259	struct mlx4_ib_fast_reg_page_list *mfrpl = to_mfrpl(page_list);
260	int size = page_list->max_page_list_len * sizeof (u64);
261
262	dma_free_coherent(&dev->dev->pdev->dev, size, mfrpl->mapped_page_list,
263			  mfrpl->map);
264	kfree(mfrpl->ibfrpl.page_list);
265	kfree(mfrpl);
266}
267
268struct ib_fmr *mlx4_ib_fmr_alloc(struct ib_pd *pd, int acc,
269				 struct ib_fmr_attr *fmr_attr)
270{
271	struct mlx4_ib_dev *dev = to_mdev(pd->device);
272	struct mlx4_ib_fmr *fmr;
273	int err = -ENOMEM;
274
275	fmr = kmalloc(sizeof *fmr, GFP_KERNEL);
276	if (!fmr)
277		return ERR_PTR(-ENOMEM);
278
279	err = mlx4_fmr_alloc(dev->dev, to_mpd(pd)->pdn, convert_access(acc),
280			     fmr_attr->max_pages, fmr_attr->max_maps,
281			     fmr_attr->page_shift, &fmr->mfmr);
282	if (err)
283		goto err_free;
284
285	err = mlx4_fmr_enable(to_mdev(pd->device)->dev, &fmr->mfmr);
286	if (err)
287		goto err_mr;
288
289	fmr->ibfmr.rkey = fmr->ibfmr.lkey = fmr->mfmr.mr.key;
290
291	return &fmr->ibfmr;
292
293err_mr:
294	mlx4_mr_free(to_mdev(pd->device)->dev, &fmr->mfmr.mr);
295
296err_free:
297	kfree(fmr);
298
299	return ERR_PTR(err);
300}
301
302int mlx4_ib_map_phys_fmr(struct ib_fmr *ibfmr, u64 *page_list,
303		      int npages, u64 iova)
304{
305	struct mlx4_ib_fmr *ifmr = to_mfmr(ibfmr);
306	struct mlx4_ib_dev *dev = to_mdev(ifmr->ibfmr.device);
307
308	return mlx4_map_phys_fmr(dev->dev, &ifmr->mfmr, page_list, npages, iova,
309				 &ifmr->ibfmr.lkey, &ifmr->ibfmr.rkey);
310}
311
312int mlx4_ib_unmap_fmr(struct list_head *fmr_list)
313{
314	struct ib_fmr *ibfmr;
315	int err;
316	struct mlx4_dev *mdev = NULL;
317
318	list_for_each_entry(ibfmr, fmr_list, list) {
319		if (mdev && to_mdev(ibfmr->device)->dev != mdev)
320			return -EINVAL;
321		mdev = to_mdev(ibfmr->device)->dev;
322	}
323
324	if (!mdev)
325		return 0;
326
327	list_for_each_entry(ibfmr, fmr_list, list) {
328		struct mlx4_ib_fmr *ifmr = to_mfmr(ibfmr);
329
330		mlx4_fmr_unmap(mdev, &ifmr->mfmr, &ifmr->ibfmr.lkey, &ifmr->ibfmr.rkey);
331	}
332
333	/*
334	 * Make sure all MPT status updates are visible before issuing
335	 * SYNC_TPT firmware command.
336	 */
337	wmb();
338
339	err = mlx4_SYNC_TPT(mdev);
340	if (err)
341		printk(KERN_WARNING "mlx4_ib: SYNC_TPT error %d when "
342		       "unmapping FMRs\n", err);
343
344	return 0;
345}
346
347int mlx4_ib_fmr_dealloc(struct ib_fmr *ibfmr)
348{
349	struct mlx4_ib_fmr *ifmr = to_mfmr(ibfmr);
350	struct mlx4_ib_dev *dev = to_mdev(ibfmr->device);
351	int err;
352
353	err = mlx4_fmr_free(dev->dev, &ifmr->mfmr);
354
355	if (!err)
356		kfree(ifmr);
357
358	return err;
359}
360