2 * Copyright (c) 2012-2016 VMware, Inc. All rights reserved.
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
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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.
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14 * along with this program available in the file COPYING in the main
15 * directory of this source tree.
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20 * without modification, are permitted provided that the following
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24 * copyright notice, this list of conditions and the following
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46 #include <linux/list.h>
47 #include <linux/slab.h>
52 * pvrdma_get_dma_mr - get a DMA memory region
53 * @pd: protection domain
56 * @return: ib_mr pointer on success, otherwise returns an errno.
58 struct ib_mr *pvrdma_get_dma_mr(struct ib_pd *pd, int acc)
60 struct pvrdma_dev *dev = to_vdev(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;
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(-EOPNOTSUPP);
75 mr = kzalloc(sizeof(*mr), GFP_KERNEL);
77 return ERR_PTR(-ENOMEM);
79 memset(cmd, 0, sizeof(*cmd));
80 cmd->hdr.cmd = PVRDMA_CMD_CREATE_MR;
81 cmd->pd_handle = to_vpd(pd)->pd_handle;
82 cmd->access_flags = acc;
83 cmd->flags = PVRDMA_MR_FLAG_DMA;
85 ret = pvrdma_cmd_post(dev, &req, &rsp, PVRDMA_CMD_CREATE_MR_RESP);
87 dev_warn(&dev->pdev->dev,
88 "could not get DMA mem region, error: %d\n", ret);
93 mr->mmr.mr_handle = resp->mr_handle;
94 mr->ibmr.lkey = resp->lkey;
95 mr->ibmr.rkey = resp->rkey;
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
109 * @return: ib_mr pointer on success, otherwise returns an errno.
111 struct ib_mr *pvrdma_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
112 u64 virt_addr, int access_flags,
113 struct ib_udata *udata)
115 struct pvrdma_dev *dev = to_vdev(pd->device);
116 struct pvrdma_user_mr *mr = NULL;
117 struct ib_umem *umem;
118 union pvrdma_cmd_req req;
119 union pvrdma_cmd_resp rsp;
120 struct pvrdma_cmd_create_mr *cmd = &req.create_mr;
121 struct pvrdma_cmd_create_mr_resp *resp = &rsp.create_mr_resp;
125 struct scatterlist *sg;
127 if (length == 0 || length > dev->dsr->caps.max_mr_size) {
128 dev_warn(&dev->pdev->dev, "invalid mem region length\n");
129 return ERR_PTR(-EINVAL);
132 umem = ib_umem_get(pd->uobject->context, start,
133 length, access_flags, 0);
135 dev_warn(&dev->pdev->dev,
136 "could not get umem for mem region\n");
137 return ERR_CAST(umem);
141 for_each_sg(umem->sg_head.sgl, sg, umem->nmap, entry)
142 nchunks += sg_dma_len(sg) >> PAGE_SHIFT;
144 if (nchunks < 0 || nchunks > PVRDMA_PAGE_DIR_MAX_PAGES) {
145 dev_warn(&dev->pdev->dev, "overflow %d pages in mem region\n",
151 mr = kzalloc(sizeof(*mr), GFP_KERNEL);
157 mr->mmr.iova = virt_addr;
158 mr->mmr.size = length;
161 ret = pvrdma_page_dir_init(dev, &mr->pdir, nchunks, false);
163 dev_warn(&dev->pdev->dev,
164 "could not allocate page directory\n");
168 ret = pvrdma_page_dir_insert_umem(&mr->pdir, mr->umem, 0);
172 memset(cmd, 0, sizeof(*cmd));
173 cmd->hdr.cmd = PVRDMA_CMD_CREATE_MR;
175 cmd->length = length;
176 cmd->pd_handle = to_vpd(pd)->pd_handle;
177 cmd->access_flags = access_flags;
178 cmd->nchunks = nchunks;
179 cmd->pdir_dma = mr->pdir.dir_dma;
181 ret = pvrdma_cmd_post(dev, &req, &rsp, PVRDMA_CMD_CREATE_MR_RESP);
183 dev_warn(&dev->pdev->dev,
184 "could not register mem region, error: %d\n", ret);
188 mr->mmr.mr_handle = resp->mr_handle;
189 mr->ibmr.lkey = resp->lkey;
190 mr->ibmr.rkey = resp->rkey;
195 pvrdma_page_dir_cleanup(dev, &mr->pdir);
197 ib_umem_release(umem);
204 * pvrdma_alloc_mr - allocate a memory region
205 * @pd: protection domain
206 * @mr_type: type of memory region
207 * @max_num_sg: maximum number of pages
209 * @return: ib_mr pointer on success, otherwise returns an errno.
211 struct ib_mr *pvrdma_alloc_mr(struct ib_pd *pd, enum ib_mr_type mr_type,
214 struct pvrdma_dev *dev = to_vdev(pd->device);
215 struct pvrdma_user_mr *mr;
216 union pvrdma_cmd_req req;
217 union pvrdma_cmd_resp rsp;
218 struct pvrdma_cmd_create_mr *cmd = &req.create_mr;
219 struct pvrdma_cmd_create_mr_resp *resp = &rsp.create_mr_resp;
220 int size = max_num_sg * sizeof(u64);
223 if (mr_type != IB_MR_TYPE_MEM_REG ||
224 max_num_sg > PVRDMA_MAX_FAST_REG_PAGES)
225 return ERR_PTR(-EINVAL);
227 mr = kzalloc(sizeof(*mr), GFP_KERNEL);
229 return ERR_PTR(-ENOMEM);
231 mr->pages = kzalloc(size, GFP_KERNEL);
237 ret = pvrdma_page_dir_init(dev, &mr->pdir, max_num_sg, false);
239 dev_warn(&dev->pdev->dev,
240 "failed to allocate page dir for mr\n");
245 memset(cmd, 0, sizeof(*cmd));
246 cmd->hdr.cmd = PVRDMA_CMD_CREATE_MR;
247 cmd->pd_handle = to_vpd(pd)->pd_handle;
248 cmd->access_flags = 0;
249 cmd->flags = PVRDMA_MR_FLAG_FRMR;
250 cmd->nchunks = max_num_sg;
252 ret = pvrdma_cmd_post(dev, &req, &rsp, PVRDMA_CMD_CREATE_MR_RESP);
254 dev_warn(&dev->pdev->dev,
255 "could not create FR mem region, error: %d\n", ret);
259 mr->max_pages = max_num_sg;
260 mr->mmr.mr_handle = resp->mr_handle;
261 mr->ibmr.lkey = resp->lkey;
262 mr->ibmr.rkey = resp->rkey;
263 mr->page_shift = PAGE_SHIFT;
269 pvrdma_page_dir_cleanup(dev, &mr->pdir);
278 * pvrdma_dereg_mr - deregister a memory region
279 * @ibmr: memory region
281 * @return: 0 on success.
283 int pvrdma_dereg_mr(struct ib_mr *ibmr)
285 struct pvrdma_user_mr *mr = to_vmr(ibmr);
286 struct pvrdma_dev *dev = to_vdev(ibmr->device);
287 union pvrdma_cmd_req req;
288 struct pvrdma_cmd_destroy_mr *cmd = &req.destroy_mr;
291 memset(cmd, 0, sizeof(*cmd));
292 cmd->hdr.cmd = PVRDMA_CMD_DESTROY_MR;
293 cmd->mr_handle = mr->mmr.mr_handle;
294 ret = pvrdma_cmd_post(dev, &req, NULL, 0);
296 dev_warn(&dev->pdev->dev,
297 "could not deregister mem region, error: %d\n", ret);
299 pvrdma_page_dir_cleanup(dev, &mr->pdir);
301 ib_umem_release(mr->umem);
309 static int pvrdma_set_page(struct ib_mr *ibmr, u64 addr)
311 struct pvrdma_user_mr *mr = to_vmr(ibmr);
313 if (mr->npages == mr->max_pages)
316 mr->pages[mr->npages++] = addr;
320 int pvrdma_map_mr_sg(struct ib_mr *ibmr, struct scatterlist *sg, int sg_nents,
321 unsigned int *sg_offset)
323 struct pvrdma_user_mr *mr = to_vmr(ibmr);
324 struct pvrdma_dev *dev = to_vdev(ibmr->device);
329 ret = ib_sg_to_pages(ibmr, sg, sg_nents, sg_offset, pvrdma_set_page);
331 dev_warn(&dev->pdev->dev, "could not map sg to pages\n");