1/*
2 * Copyright (c) 2012-2016 VMware, Inc. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of EITHER the GNU General Public License
6 * version 2 as published by the Free Software Foundation or the BSD
7 * 2-Clause License. This program is distributed in the hope that it
8 * will be useful, but WITHOUT ANY WARRANTY; WITHOUT EVEN THE IMPLIED
9 * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
10 * See the GNU General Public License version 2 for more details at
11 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program available in the file COPYING in the main
15 * directory of this source tree.
16 *
17 * The BSD 2-Clause License
18 *
19 * Redistribution and use in source and binary forms, with or
20 * without modification, are permitted provided that the following
21 * conditions are met:
22 *
23 * - Redistributions of source code must retain the above
24 * copyright notice, this list of conditions and the following
25 * disclaimer.
26 *
27 * - Redistributions in binary form must reproduce the above
28 * copyright notice, this list of conditions and the following
29 * disclaimer in the documentation and/or other materials
30 * provided with the distribution.
31 *
32 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
33 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
34 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
35 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
36 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
37 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
38 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
39 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
40 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
41 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
42 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
43 * OF THE POSSIBILITY OF SUCH DAMAGE.
44 */
45
46#include <linux/list.h>
47#include <linux/slab.h>
48
49#include "pvrdma.h"
50
51/**
52 * pvrdma_get_dma_mr - get a DMA memory region
53 * @pd: protection domain
54 * @acc: access flags
55 *
56 * @return: ib_mr pointer on success, otherwise returns an errno.
57 */
58struct ib_mr *pvrdma_get_dma_mr(struct ib_pd *pd, int acc)
59{
60 struct pvrdma_dev *dev = to_vdev(ibdev: pd->device);
61 struct pvrdma_user_mr *mr;
62 union pvrdma_cmd_req req;
63 union pvrdma_cmd_resp rsp;
64 struct pvrdma_cmd_create_mr *cmd = &req.create_mr;
65 struct pvrdma_cmd_create_mr_resp *resp = &rsp.create_mr_resp;
66 int ret;
67
68 /* Support only LOCAL_WRITE flag for DMA MRs */
69 if (acc & ~IB_ACCESS_LOCAL_WRITE) {
70 dev_warn(&dev->pdev->dev,
71 "unsupported dma mr access flags %#x\n", acc);
72 return ERR_PTR(error: -EOPNOTSUPP);
73 }
74
75 mr = kzalloc(sizeof(*mr), GFP_KERNEL);
76 if (!mr)
77 return ERR_PTR(error: -ENOMEM);
78
79 memset(cmd, 0, sizeof(*cmd));
80 cmd->hdr.cmd = PVRDMA_CMD_CREATE_MR;
81 cmd->pd_handle = to_vpd(ibpd: pd)->pd_handle;
82 cmd->access_flags = acc;
83 cmd->flags = PVRDMA_MR_FLAG_DMA;
84
85 ret = pvrdma_cmd_post(dev, req: &req, rsp: &rsp, resp_code: PVRDMA_CMD_CREATE_MR_RESP);
86 if (ret < 0) {
87 dev_warn(&dev->pdev->dev,
88 "could not get DMA mem region, error: %d\n", ret);
89 kfree(objp: mr);
90 return ERR_PTR(error: ret);
91 }
92
93 mr->mmr.mr_handle = resp->mr_handle;
94 mr->ibmr.lkey = resp->lkey;
95 mr->ibmr.rkey = resp->rkey;
96
97 return &mr->ibmr;
98}
99
100/**
101 * pvrdma_reg_user_mr - register a userspace memory region
102 * @pd: protection domain
103 * @start: starting address
104 * @length: length of region
105 * @virt_addr: I/O virtual address
106 * @access_flags: access flags for memory region
107 * @dmah: dma handle
108 * @udata: user data
109 *
110 * @return: ib_mr pointer on success, otherwise returns an errno.
111 */
112struct ib_mr *pvrdma_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
113 u64 virt_addr, int access_flags,
114 struct ib_dmah *dmah,
115 struct ib_udata *udata)
116{
117 struct pvrdma_dev *dev = to_vdev(ibdev: pd->device);
118 struct pvrdma_user_mr *mr = NULL;
119 struct ib_umem *umem;
120 union pvrdma_cmd_req req;
121 union pvrdma_cmd_resp rsp;
122 struct pvrdma_cmd_create_mr *cmd = &req.create_mr;
123 struct pvrdma_cmd_create_mr_resp *resp = &rsp.create_mr_resp;
124 int ret, npages;
125
126 if (dmah)
127 return ERR_PTR(error: -EOPNOTSUPP);
128
129 if (length == 0 || length > dev->dsr->caps.max_mr_size) {
130 dev_warn(&dev->pdev->dev, "invalid mem region length\n");
131 return ERR_PTR(error: -EINVAL);
132 }
133
134 umem = ib_umem_get(device: pd->device, addr: start, size: length, access: access_flags);
135 if (IS_ERR(ptr: umem)) {
136 dev_warn(&dev->pdev->dev,
137 "could not get umem for mem region\n");
138 return ERR_CAST(ptr: umem);
139 }
140
141 npages = ib_umem_num_dma_blocks(umem, PAGE_SIZE);
142 if (npages < 0 || npages > PVRDMA_PAGE_DIR_MAX_PAGES) {
143 dev_warn(&dev->pdev->dev, "overflow %d pages in mem region\n",
144 npages);
145 ret = -EINVAL;
146 goto err_umem;
147 }
148
149 mr = kzalloc(sizeof(*mr), GFP_KERNEL);
150 if (!mr) {
151 ret = -ENOMEM;
152 goto err_umem;
153 }
154
155 mr->mmr.iova = virt_addr;
156 mr->mmr.size = length;
157 mr->umem = umem;
158
159 ret = pvrdma_page_dir_init(dev, pdir: &mr->pdir, npages, alloc_pages: false);
160 if (ret) {
161 dev_warn(&dev->pdev->dev,
162 "could not allocate page directory\n");
163 goto err_umem;
164 }
165
166 ret = pvrdma_page_dir_insert_umem(pdir: &mr->pdir, umem: mr->umem, offset: 0);
167 if (ret)
168 goto err_pdir;
169
170 memset(cmd, 0, sizeof(*cmd));
171 cmd->hdr.cmd = PVRDMA_CMD_CREATE_MR;
172 cmd->start = start;
173 cmd->length = length;
174 cmd->pd_handle = to_vpd(ibpd: pd)->pd_handle;
175 cmd->access_flags = access_flags;
176 cmd->nchunks = npages;
177 cmd->pdir_dma = mr->pdir.dir_dma;
178
179 ret = pvrdma_cmd_post(dev, req: &req, rsp: &rsp, resp_code: PVRDMA_CMD_CREATE_MR_RESP);
180 if (ret < 0) {
181 dev_warn(&dev->pdev->dev,
182 "could not register mem region, error: %d\n", ret);
183 goto err_pdir;
184 }
185
186 mr->mmr.mr_handle = resp->mr_handle;
187 mr->ibmr.lkey = resp->lkey;
188 mr->ibmr.rkey = resp->rkey;
189
190 return &mr->ibmr;
191
192err_pdir:
193 pvrdma_page_dir_cleanup(dev, pdir: &mr->pdir);
194err_umem:
195 ib_umem_release(umem);
196 kfree(objp: mr);
197
198 return ERR_PTR(error: ret);
199}
200
201/**
202 * pvrdma_alloc_mr - allocate a memory region
203 * @pd: protection domain
204 * @mr_type: type of memory region
205 * @max_num_sg: maximum number of pages
206 *
207 * @return: ib_mr pointer on success, otherwise returns an errno.
208 */
209struct ib_mr *pvrdma_alloc_mr(struct ib_pd *pd, enum ib_mr_type mr_type,
210 u32 max_num_sg)
211{
212 struct pvrdma_dev *dev = to_vdev(ibdev: pd->device);
213 struct pvrdma_user_mr *mr;
214 union pvrdma_cmd_req req;
215 union pvrdma_cmd_resp rsp;
216 struct pvrdma_cmd_create_mr *cmd = &req.create_mr;
217 struct pvrdma_cmd_create_mr_resp *resp = &rsp.create_mr_resp;
218 int size = max_num_sg * sizeof(u64);
219 int ret;
220
221 if (mr_type != IB_MR_TYPE_MEM_REG ||
222 max_num_sg > PVRDMA_MAX_FAST_REG_PAGES)
223 return ERR_PTR(error: -EINVAL);
224
225 mr = kzalloc(sizeof(*mr), GFP_KERNEL);
226 if (!mr)
227 return ERR_PTR(error: -ENOMEM);
228
229 mr->pages = kzalloc(size, GFP_KERNEL);
230 if (!mr->pages) {
231 ret = -ENOMEM;
232 goto freemr;
233 }
234
235 ret = pvrdma_page_dir_init(dev, pdir: &mr->pdir, npages: max_num_sg, alloc_pages: false);
236 if (ret) {
237 dev_warn(&dev->pdev->dev,
238 "failed to allocate page dir for mr\n");
239 ret = -ENOMEM;
240 goto freepages;
241 }
242
243 memset(cmd, 0, sizeof(*cmd));
244 cmd->hdr.cmd = PVRDMA_CMD_CREATE_MR;
245 cmd->pd_handle = to_vpd(ibpd: pd)->pd_handle;
246 cmd->access_flags = 0;
247 cmd->flags = PVRDMA_MR_FLAG_FRMR;
248 cmd->nchunks = max_num_sg;
249
250 ret = pvrdma_cmd_post(dev, req: &req, rsp: &rsp, resp_code: PVRDMA_CMD_CREATE_MR_RESP);
251 if (ret < 0) {
252 dev_warn(&dev->pdev->dev,
253 "could not create FR mem region, error: %d\n", ret);
254 goto freepdir;
255 }
256
257 mr->max_pages = max_num_sg;
258 mr->mmr.mr_handle = resp->mr_handle;
259 mr->ibmr.lkey = resp->lkey;
260 mr->ibmr.rkey = resp->rkey;
261 mr->page_shift = PAGE_SHIFT;
262 mr->umem = NULL;
263
264 return &mr->ibmr;
265
266freepdir:
267 pvrdma_page_dir_cleanup(dev, pdir: &mr->pdir);
268freepages:
269 kfree(objp: mr->pages);
270freemr:
271 kfree(objp: mr);
272 return ERR_PTR(error: ret);
273}
274
275/**
276 * pvrdma_dereg_mr - deregister a memory region
277 * @ibmr: memory region
278 * @udata: pointer to user data
279 *
280 * @return: 0 on success.
281 */
282int pvrdma_dereg_mr(struct ib_mr *ibmr, struct ib_udata *udata)
283{
284 struct pvrdma_user_mr *mr = to_vmr(ibmr);
285 struct pvrdma_dev *dev = to_vdev(ibdev: ibmr->device);
286 union pvrdma_cmd_req req;
287 struct pvrdma_cmd_destroy_mr *cmd = &req.destroy_mr;
288 int ret;
289
290 memset(cmd, 0, sizeof(*cmd));
291 cmd->hdr.cmd = PVRDMA_CMD_DESTROY_MR;
292 cmd->mr_handle = mr->mmr.mr_handle;
293 ret = pvrdma_cmd_post(dev, req: &req, NULL, resp_code: 0);
294 if (ret < 0)
295 dev_warn(&dev->pdev->dev,
296 "could not deregister mem region, error: %d\n", ret);
297
298 pvrdma_page_dir_cleanup(dev, pdir: &mr->pdir);
299 ib_umem_release(umem: mr->umem);
300
301 kfree(objp: mr->pages);
302 kfree(objp: mr);
303
304 return 0;
305}
306
307static int pvrdma_set_page(struct ib_mr *ibmr, u64 addr)
308{
309 struct pvrdma_user_mr *mr = to_vmr(ibmr);
310
311 if (mr->npages == mr->max_pages)
312 return -ENOMEM;
313
314 mr->pages[mr->npages++] = addr;
315 return 0;
316}
317
318int pvrdma_map_mr_sg(struct ib_mr *ibmr, struct scatterlist *sg, int sg_nents,
319 unsigned int *sg_offset)
320{
321 struct pvrdma_user_mr *mr = to_vmr(ibmr);
322 struct pvrdma_dev *dev = to_vdev(ibdev: ibmr->device);
323 int ret;
324
325 mr->npages = 0;
326
327 ret = ib_sg_to_pages(mr: ibmr, sgl: sg, sg_nents, sg_offset, set_page: pvrdma_set_page);
328 if (ret < 0)
329 dev_warn(&dev->pdev->dev, "could not map sg to pages\n");
330
331 return ret;
332}
333

source code of linux/drivers/infiniband/hw/vmw_pvrdma/pvrdma_mr.c