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 */ 58 struct ib_mr *pvrdma_get_dma_mr(struct ib_pd *pd, int acc) 59 { 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; 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(-EOPNOTSUPP); 73 } 74 75 mr = kzalloc(sizeof(*mr), GFP_KERNEL); 76 if (!mr) 77 return ERR_PTR(-ENOMEM); 78 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; 84 85 ret = pvrdma_cmd_post(dev, &req, &rsp, 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(mr); 90 return ERR_PTR(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 * @udata: user data 108 * 109 * @return: ib_mr pointer on success, otherwise returns an errno. 110 */ 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) 114 { 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; 122 int nchunks; 123 int ret; 124 int entry; 125 struct scatterlist *sg; 126 127 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); 130 } 131 132 umem = ib_umem_get(pd->uobject->context, start, 133 length, access_flags, 0); 134 if (IS_ERR(umem)) { 135 dev_warn(&dev->pdev->dev, 136 "could not get umem for mem region\n"); 137 return ERR_CAST(umem); 138 } 139 140 nchunks = 0; 141 for_each_sg(umem->sg_head.sgl, sg, umem->nmap, entry) 142 nchunks += sg_dma_len(sg) >> PAGE_SHIFT; 143 144 if (nchunks < 0 || nchunks > PVRDMA_PAGE_DIR_MAX_PAGES) { 145 dev_warn(&dev->pdev->dev, "overflow %d pages in mem region\n", 146 nchunks); 147 ret = -EINVAL; 148 goto err_umem; 149 } 150 151 mr = kzalloc(sizeof(*mr), GFP_KERNEL); 152 if (!mr) { 153 ret = -ENOMEM; 154 goto err_umem; 155 } 156 157 mr->mmr.iova = virt_addr; 158 mr->mmr.size = length; 159 mr->umem = umem; 160 161 ret = pvrdma_page_dir_init(dev, &mr->pdir, nchunks, false); 162 if (ret) { 163 dev_warn(&dev->pdev->dev, 164 "could not allocate page directory\n"); 165 goto err_umem; 166 } 167 168 ret = pvrdma_page_dir_insert_umem(&mr->pdir, mr->umem, 0); 169 if (ret) 170 goto err_pdir; 171 172 memset(cmd, 0, sizeof(*cmd)); 173 cmd->hdr.cmd = PVRDMA_CMD_CREATE_MR; 174 cmd->start = start; 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; 180 181 ret = pvrdma_cmd_post(dev, &req, &rsp, PVRDMA_CMD_CREATE_MR_RESP); 182 if (ret < 0) { 183 dev_warn(&dev->pdev->dev, 184 "could not register mem region, error: %d\n", ret); 185 goto err_pdir; 186 } 187 188 mr->mmr.mr_handle = resp->mr_handle; 189 mr->ibmr.lkey = resp->lkey; 190 mr->ibmr.rkey = resp->rkey; 191 192 return &mr->ibmr; 193 194 err_pdir: 195 pvrdma_page_dir_cleanup(dev, &mr->pdir); 196 err_umem: 197 ib_umem_release(umem); 198 kfree(mr); 199 200 return ERR_PTR(ret); 201 } 202 203 /** 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 208 * 209 * @return: ib_mr pointer on success, otherwise returns an errno. 210 */ 211 struct ib_mr *pvrdma_alloc_mr(struct ib_pd *pd, enum ib_mr_type mr_type, 212 u32 max_num_sg) 213 { 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); 221 int ret; 222 223 if (mr_type != IB_MR_TYPE_MEM_REG || 224 max_num_sg > PVRDMA_MAX_FAST_REG_PAGES) 225 return ERR_PTR(-EINVAL); 226 227 mr = kzalloc(sizeof(*mr), GFP_KERNEL); 228 if (!mr) 229 return ERR_PTR(-ENOMEM); 230 231 mr->pages = kzalloc(size, GFP_KERNEL); 232 if (!mr->pages) { 233 ret = -ENOMEM; 234 goto freemr; 235 } 236 237 ret = pvrdma_page_dir_init(dev, &mr->pdir, max_num_sg, false); 238 if (ret) { 239 dev_warn(&dev->pdev->dev, 240 "failed to allocate page dir for mr\n"); 241 ret = -ENOMEM; 242 goto freepages; 243 } 244 245 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; 251 252 ret = pvrdma_cmd_post(dev, &req, &rsp, PVRDMA_CMD_CREATE_MR_RESP); 253 if (ret < 0) { 254 dev_warn(&dev->pdev->dev, 255 "could not create FR mem region, error: %d\n", ret); 256 goto freepdir; 257 } 258 259 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; 264 mr->umem = NULL; 265 266 return &mr->ibmr; 267 268 freepdir: 269 pvrdma_page_dir_cleanup(dev, &mr->pdir); 270 freepages: 271 kfree(mr->pages); 272 freemr: 273 kfree(mr); 274 return ERR_PTR(ret); 275 } 276 277 /** 278 * pvrdma_dereg_mr - deregister a memory region 279 * @ibmr: memory region 280 * 281 * @return: 0 on success. 282 */ 283 int pvrdma_dereg_mr(struct ib_mr *ibmr) 284 { 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; 289 int ret; 290 291 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); 295 if (ret < 0) 296 dev_warn(&dev->pdev->dev, 297 "could not deregister mem region, error: %d\n", ret); 298 299 pvrdma_page_dir_cleanup(dev, &mr->pdir); 300 if (mr->umem) 301 ib_umem_release(mr->umem); 302 303 kfree(mr->pages); 304 kfree(mr); 305 306 return 0; 307 } 308 309 static int pvrdma_set_page(struct ib_mr *ibmr, u64 addr) 310 { 311 struct pvrdma_user_mr *mr = to_vmr(ibmr); 312 313 if (mr->npages == mr->max_pages) 314 return -ENOMEM; 315 316 mr->pages[mr->npages++] = addr; 317 return 0; 318 } 319 320 int pvrdma_map_mr_sg(struct ib_mr *ibmr, struct scatterlist *sg, int sg_nents, 321 unsigned int *sg_offset) 322 { 323 struct pvrdma_user_mr *mr = to_vmr(ibmr); 324 struct pvrdma_dev *dev = to_vdev(ibmr->device); 325 int ret; 326 327 mr->npages = 0; 328 329 ret = ib_sg_to_pages(ibmr, sg, sg_nents, sg_offset, pvrdma_set_page); 330 if (ret < 0) 331 dev_warn(&dev->pdev->dev, "could not map sg to pages\n"); 332 333 return ret; 334 } 335