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 ret; 123 124 if (length == 0 || length > dev->dsr->caps.max_mr_size) { 125 dev_warn(&dev->pdev->dev, "invalid mem region length\n"); 126 return ERR_PTR(-EINVAL); 127 } 128 129 umem = ib_umem_get(udata, start, length, access_flags, 0); 130 if (IS_ERR(umem)) { 131 dev_warn(&dev->pdev->dev, 132 "could not get umem for mem region\n"); 133 return ERR_CAST(umem); 134 } 135 136 if (umem->npages < 0 || umem->npages > PVRDMA_PAGE_DIR_MAX_PAGES) { 137 dev_warn(&dev->pdev->dev, "overflow %d pages in mem region\n", 138 umem->npages); 139 ret = -EINVAL; 140 goto err_umem; 141 } 142 143 mr = kzalloc(sizeof(*mr), GFP_KERNEL); 144 if (!mr) { 145 ret = -ENOMEM; 146 goto err_umem; 147 } 148 149 mr->mmr.iova = virt_addr; 150 mr->mmr.size = length; 151 mr->umem = umem; 152 153 ret = pvrdma_page_dir_init(dev, &mr->pdir, umem->npages, false); 154 if (ret) { 155 dev_warn(&dev->pdev->dev, 156 "could not allocate page directory\n"); 157 goto err_umem; 158 } 159 160 ret = pvrdma_page_dir_insert_umem(&mr->pdir, mr->umem, 0); 161 if (ret) 162 goto err_pdir; 163 164 memset(cmd, 0, sizeof(*cmd)); 165 cmd->hdr.cmd = PVRDMA_CMD_CREATE_MR; 166 cmd->start = start; 167 cmd->length = length; 168 cmd->pd_handle = to_vpd(pd)->pd_handle; 169 cmd->access_flags = access_flags; 170 cmd->nchunks = umem->npages; 171 cmd->pdir_dma = mr->pdir.dir_dma; 172 173 ret = pvrdma_cmd_post(dev, &req, &rsp, PVRDMA_CMD_CREATE_MR_RESP); 174 if (ret < 0) { 175 dev_warn(&dev->pdev->dev, 176 "could not register mem region, error: %d\n", ret); 177 goto err_pdir; 178 } 179 180 mr->mmr.mr_handle = resp->mr_handle; 181 mr->ibmr.lkey = resp->lkey; 182 mr->ibmr.rkey = resp->rkey; 183 184 return &mr->ibmr; 185 186 err_pdir: 187 pvrdma_page_dir_cleanup(dev, &mr->pdir); 188 err_umem: 189 ib_umem_release(umem); 190 kfree(mr); 191 192 return ERR_PTR(ret); 193 } 194 195 /** 196 * pvrdma_alloc_mr - allocate a memory region 197 * @pd: protection domain 198 * @mr_type: type of memory region 199 * @max_num_sg: maximum number of pages 200 * 201 * @return: ib_mr pointer on success, otherwise returns an errno. 202 */ 203 struct ib_mr *pvrdma_alloc_mr(struct ib_pd *pd, enum ib_mr_type mr_type, 204 u32 max_num_sg) 205 { 206 struct pvrdma_dev *dev = to_vdev(pd->device); 207 struct pvrdma_user_mr *mr; 208 union pvrdma_cmd_req req; 209 union pvrdma_cmd_resp rsp; 210 struct pvrdma_cmd_create_mr *cmd = &req.create_mr; 211 struct pvrdma_cmd_create_mr_resp *resp = &rsp.create_mr_resp; 212 int size = max_num_sg * sizeof(u64); 213 int ret; 214 215 if (mr_type != IB_MR_TYPE_MEM_REG || 216 max_num_sg > PVRDMA_MAX_FAST_REG_PAGES) 217 return ERR_PTR(-EINVAL); 218 219 mr = kzalloc(sizeof(*mr), GFP_KERNEL); 220 if (!mr) 221 return ERR_PTR(-ENOMEM); 222 223 mr->pages = kzalloc(size, GFP_KERNEL); 224 if (!mr->pages) { 225 ret = -ENOMEM; 226 goto freemr; 227 } 228 229 ret = pvrdma_page_dir_init(dev, &mr->pdir, max_num_sg, false); 230 if (ret) { 231 dev_warn(&dev->pdev->dev, 232 "failed to allocate page dir for mr\n"); 233 ret = -ENOMEM; 234 goto freepages; 235 } 236 237 memset(cmd, 0, sizeof(*cmd)); 238 cmd->hdr.cmd = PVRDMA_CMD_CREATE_MR; 239 cmd->pd_handle = to_vpd(pd)->pd_handle; 240 cmd->access_flags = 0; 241 cmd->flags = PVRDMA_MR_FLAG_FRMR; 242 cmd->nchunks = max_num_sg; 243 244 ret = pvrdma_cmd_post(dev, &req, &rsp, PVRDMA_CMD_CREATE_MR_RESP); 245 if (ret < 0) { 246 dev_warn(&dev->pdev->dev, 247 "could not create FR mem region, error: %d\n", ret); 248 goto freepdir; 249 } 250 251 mr->max_pages = max_num_sg; 252 mr->mmr.mr_handle = resp->mr_handle; 253 mr->ibmr.lkey = resp->lkey; 254 mr->ibmr.rkey = resp->rkey; 255 mr->page_shift = PAGE_SHIFT; 256 mr->umem = NULL; 257 258 return &mr->ibmr; 259 260 freepdir: 261 pvrdma_page_dir_cleanup(dev, &mr->pdir); 262 freepages: 263 kfree(mr->pages); 264 freemr: 265 kfree(mr); 266 return ERR_PTR(ret); 267 } 268 269 /** 270 * pvrdma_dereg_mr - deregister a memory region 271 * @ibmr: memory region 272 * 273 * @return: 0 on success. 274 */ 275 int pvrdma_dereg_mr(struct ib_mr *ibmr) 276 { 277 struct pvrdma_user_mr *mr = to_vmr(ibmr); 278 struct pvrdma_dev *dev = to_vdev(ibmr->device); 279 union pvrdma_cmd_req req; 280 struct pvrdma_cmd_destroy_mr *cmd = &req.destroy_mr; 281 int ret; 282 283 memset(cmd, 0, sizeof(*cmd)); 284 cmd->hdr.cmd = PVRDMA_CMD_DESTROY_MR; 285 cmd->mr_handle = mr->mmr.mr_handle; 286 ret = pvrdma_cmd_post(dev, &req, NULL, 0); 287 if (ret < 0) 288 dev_warn(&dev->pdev->dev, 289 "could not deregister mem region, error: %d\n", ret); 290 291 pvrdma_page_dir_cleanup(dev, &mr->pdir); 292 if (mr->umem) 293 ib_umem_release(mr->umem); 294 295 kfree(mr->pages); 296 kfree(mr); 297 298 return 0; 299 } 300 301 static int pvrdma_set_page(struct ib_mr *ibmr, u64 addr) 302 { 303 struct pvrdma_user_mr *mr = to_vmr(ibmr); 304 305 if (mr->npages == mr->max_pages) 306 return -ENOMEM; 307 308 mr->pages[mr->npages++] = addr; 309 return 0; 310 } 311 312 int pvrdma_map_mr_sg(struct ib_mr *ibmr, struct scatterlist *sg, int sg_nents, 313 unsigned int *sg_offset) 314 { 315 struct pvrdma_user_mr *mr = to_vmr(ibmr); 316 struct pvrdma_dev *dev = to_vdev(ibmr->device); 317 int ret; 318 319 mr->npages = 0; 320 321 ret = ib_sg_to_pages(ibmr, sg, sg_nents, sg_offset, pvrdma_set_page); 322 if (ret < 0) 323 dev_warn(&dev->pdev->dev, "could not map sg to pages\n"); 324 325 return ret; 326 } 327