summaryrefslogtreecommitdiff
path: root/drivers/infiniband/hw/vmw_pvrdma/pvrdma_mr.c
blob: c61e665ff26151aa9070af28aff0680e06687bf0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
/*
 * Copyright (c) 2012-2016 VMware, Inc.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of EITHER the GNU General Public License
 * version 2 as published by the Free Software Foundation or the BSD
 * 2-Clause License. This program is distributed in the hope that it
 * will be useful, but WITHOUT ANY WARRANTY; WITHOUT EVEN THE IMPLIED
 * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License version 2 for more details at
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program available in the file COPYING in the main
 * directory of this source tree.
 *
 * The BSD 2-Clause License
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <linux/list.h>
#include <linux/slab.h>

#include "pvrdma.h"

/**
 * pvrdma_get_dma_mr - get a DMA memory region
 * @pd: protection domain
 * @acc: access flags
 *
 * @return: ib_mr pointer on success, otherwise returns an errno.
 */
struct ib_mr *pvrdma_get_dma_mr(struct ib_pd *pd, int acc)
{
	struct pvrdma_dev *dev = to_vdev(pd->device);
	struct pvrdma_user_mr *mr;
	union pvrdma_cmd_req req;
	union pvrdma_cmd_resp rsp;
	struct pvrdma_cmd_create_mr *cmd = &req.create_mr;
	struct pvrdma_cmd_create_mr_resp *resp = &rsp.create_mr_resp;
	int ret;

	/* Support only LOCAL_WRITE flag for DMA MRs */
	if (acc & ~IB_ACCESS_LOCAL_WRITE) {
		dev_warn(&dev->pdev->dev,
			 "unsupported dma mr access flags %#x\n", acc);
		return ERR_PTR(-EOPNOTSUPP);
	}

	mr = kzalloc(sizeof(*mr), GFP_KERNEL);
	if (!mr)
		return ERR_PTR(-ENOMEM);

	memset(cmd, 0, sizeof(*cmd));
	cmd->hdr.cmd = PVRDMA_CMD_CREATE_MR;
	cmd->pd_handle = to_vpd(pd)->pd_handle;
	cmd->access_flags = acc;
	cmd->flags = PVRDMA_MR_FLAG_DMA;

	ret = pvrdma_cmd_post(dev, &req, &rsp, PVRDMA_CMD_CREATE_MR_RESP);
	if (ret < 0) {
		dev_warn(&dev->pdev->dev,
			 "could not get DMA mem region, error: %d\n", ret);
		kfree(mr);
		return ERR_PTR(ret);
	}

	mr->mmr.mr_handle = resp->mr_handle;
	mr->ibmr.lkey = resp->lkey;
	mr->ibmr.rkey = resp->rkey;

	return &mr->ibmr;
}

/**
 * pvrdma_reg_user_mr - register a userspace memory region
 * @pd: protection domain
 * @start: starting address
 * @length: length of region
 * @virt_addr: I/O virtual address
 * @access_flags: access flags for memory region
 * @udata: user data
 *
 * @return: ib_mr pointer on success, otherwise returns an errno.
 */
struct ib_mr *pvrdma_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
				 u64 virt_addr, int access_flags,
				 struct ib_udata *udata)
{
	struct pvrdma_dev *dev = to_vdev(pd->device);
	struct pvrdma_user_mr *mr = NULL;
	struct ib_umem *umem;
	union pvrdma_cmd_req req;
	union pvrdma_cmd_resp rsp;
	struct pvrdma_cmd_create_mr *cmd = &req.create_mr;
	struct pvrdma_cmd_create_mr_resp *resp = &rsp.create_mr_resp;
	int ret, npages;

	if (length == 0 || length > dev->dsr->caps.max_mr_size) {
		dev_warn(&dev->pdev->dev, "invalid mem region length\n");
		return ERR_PTR(-EINVAL);
	}

	umem = ib_umem_get(udata, start, length, access_flags);
	if (IS_ERR(umem)) {
		dev_warn(&dev->pdev->dev,
			 "could not get umem for mem region\n");
		return ERR_CAST(umem);
	}

	npages = ib_umem_num_pages(umem);
	if (npages < 0 || npages > PVRDMA_PAGE_DIR_MAX_PAGES) {
		dev_warn(&dev->pdev->dev, "overflow %d pages in mem region\n",
			 npages);
		ret = -EINVAL;
		goto err_umem;
	}

	mr = kzalloc(sizeof(*mr), GFP_KERNEL);
	if (!mr) {
		ret = -ENOMEM;
		goto err_umem;
	}

	mr->mmr.iova = virt_addr;
	mr->mmr.size = length;
	mr->umem = umem;

	ret = pvrdma_page_dir_init(dev, &mr->pdir, npages, false);
	if (ret) {
		dev_warn(&dev->pdev->dev,
			 "could not allocate page directory\n");
		goto err_umem;
	}

	ret = pvrdma_page_dir_insert_umem(&mr->pdir, mr->umem, 0);
	if (ret)
		goto err_pdir;

	memset(cmd, 0, sizeof(*cmd));
	cmd->hdr.cmd = PVRDMA_CMD_CREATE_MR;
	cmd->start = start;
	cmd->length = length;
	cmd->pd_handle = to_vpd(pd)->pd_handle;
	cmd->access_flags = access_flags;
	cmd->nchunks = npages;
	cmd->pdir_dma = mr->pdir.dir_dma;

	ret = pvrdma_cmd_post(dev, &req, &rsp, PVRDMA_CMD_CREATE_MR_RESP);
	if (ret < 0) {
		dev_warn(&dev->pdev->dev,
			 "could not register mem region, error: %d\n", ret);
		goto err_pdir;
	}

	mr->mmr.mr_handle = resp->mr_handle;
	mr->ibmr.lkey = resp->lkey;
	mr->ibmr.rkey = resp->rkey;

	return &mr->ibmr;

err_pdir:
	pvrdma_page_dir_cleanup(dev, &mr->pdir);
err_umem:
	ib_umem_release(umem);
	kfree(mr);

	return ERR_PTR(ret);
}

/**
 * pvrdma_alloc_mr - allocate a memory region
 * @pd: protection domain
 * @mr_type: type of memory region
 * @max_num_sg: maximum number of pages
 *
 * @return: ib_mr pointer on success, otherwise returns an errno.
 */
struct ib_mr *pvrdma_alloc_mr(struct ib_pd *pd, enum ib_mr_type mr_type,
			      u32 max_num_sg, struct ib_udata *udata)
{
	struct pvrdma_dev *dev = to_vdev(pd->device);
	struct pvrdma_user_mr *mr;
	union pvrdma_cmd_req req;
	union pvrdma_cmd_resp rsp;
	struct pvrdma_cmd_create_mr *cmd = &req.create_mr;
	struct pvrdma_cmd_create_mr_resp *resp = &rsp.create_mr_resp;
	int size = max_num_sg * sizeof(u64);
	int ret;

	if (mr_type != IB_MR_TYPE_MEM_REG ||
	    max_num_sg > PVRDMA_MAX_FAST_REG_PAGES)
		return ERR_PTR(-EINVAL);

	mr = kzalloc(sizeof(*mr), GFP_KERNEL);
	if (!mr)
		return ERR_PTR(-ENOMEM);

	mr->pages = kzalloc(size, GFP_KERNEL);
	if (!mr->pages) {
		ret = -ENOMEM;
		goto freemr;
	}

	ret = pvrdma_page_dir_init(dev, &mr->pdir, max_num_sg, false);
	if (ret) {
		dev_warn(&dev->pdev->dev,
			 "failed to allocate page dir for mr\n");
		ret = -ENOMEM;
		goto freepages;
	}

	memset(cmd, 0, sizeof(*cmd));
	cmd->hdr.cmd = PVRDMA_CMD_CREATE_MR;
	cmd->pd_handle = to_vpd(pd)->pd_handle;
	cmd->access_flags = 0;
	cmd->flags = PVRDMA_MR_FLAG_FRMR;
	cmd->nchunks = max_num_sg;

	ret = pvrdma_cmd_post(dev, &req, &rsp, PVRDMA_CMD_CREATE_MR_RESP);
	if (ret < 0) {
		dev_warn(&dev->pdev->dev,
			 "could not create FR mem region, error: %d\n", ret);
		goto freepdir;
	}

	mr->max_pages = max_num_sg;
	mr->mmr.mr_handle = resp->mr_handle;
	mr->ibmr.lkey = resp->lkey;
	mr->ibmr.rkey = resp->rkey;
	mr->page_shift = PAGE_SHIFT;
	mr->umem = NULL;

	return &mr->ibmr;

freepdir:
	pvrdma_page_dir_cleanup(dev, &mr->pdir);
freepages:
	kfree(mr->pages);
freemr:
	kfree(mr);
	return ERR_PTR(ret);
}

/**
 * pvrdma_dereg_mr - deregister a memory region
 * @ibmr: memory region
 *
 * @return: 0 on success.
 */
int pvrdma_dereg_mr(struct ib_mr *ibmr, struct ib_udata *udata)
{
	struct pvrdma_user_mr *mr = to_vmr(ibmr);
	struct pvrdma_dev *dev = to_vdev(ibmr->device);
	union pvrdma_cmd_req req;
	struct pvrdma_cmd_destroy_mr *cmd = &req.destroy_mr;
	int ret;

	memset(cmd, 0, sizeof(*cmd));
	cmd->hdr.cmd = PVRDMA_CMD_DESTROY_MR;
	cmd->mr_handle = mr->mmr.mr_handle;
	ret = pvrdma_cmd_post(dev, &req, NULL, 0);
	if (ret < 0)
		dev_warn(&dev->pdev->dev,
			 "could not deregister mem region, error: %d\n", ret);

	pvrdma_page_dir_cleanup(dev, &mr->pdir);
	ib_umem_release(mr->umem);

	kfree(mr->pages);
	kfree(mr);

	return 0;
}

static int pvrdma_set_page(struct ib_mr *ibmr, u64 addr)
{
	struct pvrdma_user_mr *mr = to_vmr(ibmr);

	if (mr->npages == mr->max_pages)
		return -ENOMEM;

	mr->pages[mr->npages++] = addr;
	return 0;
}

int pvrdma_map_mr_sg(struct ib_mr *ibmr, struct scatterlist *sg, int sg_nents,
		     unsigned int *sg_offset)
{
	struct pvrdma_user_mr *mr = to_vmr(ibmr);
	struct pvrdma_dev *dev = to_vdev(ibmr->device);
	int ret;

	mr->npages = 0;

	ret = ib_sg_to_pages(ibmr, sg, sg_nents, sg_offset, pvrdma_set_page);
	if (ret < 0)
		dev_warn(&dev->pdev->dev, "could not map sg to pages\n");

	return ret;
}