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, npages; 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(pd->device, start, length, access_flags); 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 npages = ib_umem_num_dma_blocks(umem, PAGE_SIZE); 137 if (npages < 0 || npages > PVRDMA_PAGE_DIR_MAX_PAGES) { 138 dev_warn(&dev->pdev->dev, "overflow %d pages in mem region\n", 139 npages); 140 ret = -EINVAL; 141 goto err_umem; 142 } 143 144 mr = kzalloc(sizeof(*mr), GFP_KERNEL); 145 if (!mr) { 146 ret = -ENOMEM; 147 goto err_umem; 148 } 149 150 mr->mmr.iova = virt_addr; 151 mr->mmr.size = length; 152 mr->umem = umem; 153 154 ret = pvrdma_page_dir_init(dev, &mr->pdir, npages, false); 155 if (ret) { 156 dev_warn(&dev->pdev->dev, 157 "could not allocate page directory\n"); 158 goto err_umem; 159 } 160 161 ret = pvrdma_page_dir_insert_umem(&mr->pdir, mr->umem, 0); 162 if (ret) 163 goto err_pdir; 164 165 memset(cmd, 0, sizeof(*cmd)); 166 cmd->hdr.cmd = PVRDMA_CMD_CREATE_MR; 167 cmd->start = start; 168 cmd->length = length; 169 cmd->pd_handle = to_vpd(pd)->pd_handle; 170 cmd->access_flags = access_flags; 171 cmd->nchunks = npages; 172 cmd->pdir_dma = mr->pdir.dir_dma; 173 174 ret = pvrdma_cmd_post(dev, &req, &rsp, PVRDMA_CMD_CREATE_MR_RESP); 175 if (ret < 0) { 176 dev_warn(&dev->pdev->dev, 177 "could not register mem region, error: %d\n", ret); 178 goto err_pdir; 179 } 180 181 mr->mmr.mr_handle = resp->mr_handle; 182 mr->ibmr.lkey = resp->lkey; 183 mr->ibmr.rkey = resp->rkey; 184 185 return &mr->ibmr; 186 187 err_pdir: 188 pvrdma_page_dir_cleanup(dev, &mr->pdir); 189 err_umem: 190 ib_umem_release(umem); 191 kfree(mr); 192 193 return ERR_PTR(ret); 194 } 195 196 /** 197 * pvrdma_alloc_mr - allocate a memory region 198 * @pd: protection domain 199 * @mr_type: type of memory region 200 * @max_num_sg: maximum number of pages 201 * 202 * @return: ib_mr pointer on success, otherwise returns an errno. 203 */ 204 struct ib_mr *pvrdma_alloc_mr(struct ib_pd *pd, enum ib_mr_type mr_type, 205 u32 max_num_sg) 206 { 207 struct pvrdma_dev *dev = to_vdev(pd->device); 208 struct pvrdma_user_mr *mr; 209 union pvrdma_cmd_req req; 210 union pvrdma_cmd_resp rsp; 211 struct pvrdma_cmd_create_mr *cmd = &req.create_mr; 212 struct pvrdma_cmd_create_mr_resp *resp = &rsp.create_mr_resp; 213 int size = max_num_sg * sizeof(u64); 214 int ret; 215 216 if (mr_type != IB_MR_TYPE_MEM_REG || 217 max_num_sg > PVRDMA_MAX_FAST_REG_PAGES) 218 return ERR_PTR(-EINVAL); 219 220 mr = kzalloc(sizeof(*mr), GFP_KERNEL); 221 if (!mr) 222 return ERR_PTR(-ENOMEM); 223 224 mr->pages = kzalloc(size, GFP_KERNEL); 225 if (!mr->pages) { 226 ret = -ENOMEM; 227 goto freemr; 228 } 229 230 ret = pvrdma_page_dir_init(dev, &mr->pdir, max_num_sg, false); 231 if (ret) { 232 dev_warn(&dev->pdev->dev, 233 "failed to allocate page dir for mr\n"); 234 ret = -ENOMEM; 235 goto freepages; 236 } 237 238 memset(cmd, 0, sizeof(*cmd)); 239 cmd->hdr.cmd = PVRDMA_CMD_CREATE_MR; 240 cmd->pd_handle = to_vpd(pd)->pd_handle; 241 cmd->access_flags = 0; 242 cmd->flags = PVRDMA_MR_FLAG_FRMR; 243 cmd->nchunks = max_num_sg; 244 245 ret = pvrdma_cmd_post(dev, &req, &rsp, PVRDMA_CMD_CREATE_MR_RESP); 246 if (ret < 0) { 247 dev_warn(&dev->pdev->dev, 248 "could not create FR mem region, error: %d\n", ret); 249 goto freepdir; 250 } 251 252 mr->max_pages = max_num_sg; 253 mr->mmr.mr_handle = resp->mr_handle; 254 mr->ibmr.lkey = resp->lkey; 255 mr->ibmr.rkey = resp->rkey; 256 mr->page_shift = PAGE_SHIFT; 257 mr->umem = NULL; 258 259 return &mr->ibmr; 260 261 freepdir: 262 pvrdma_page_dir_cleanup(dev, &mr->pdir); 263 freepages: 264 kfree(mr->pages); 265 freemr: 266 kfree(mr); 267 return ERR_PTR(ret); 268 } 269 270 /** 271 * pvrdma_dereg_mr - deregister a memory region 272 * @ibmr: memory region 273 * @udata: pointer to user data 274 * 275 * @return: 0 on success. 276 */ 277 int pvrdma_dereg_mr(struct ib_mr *ibmr, struct ib_udata *udata) 278 { 279 struct pvrdma_user_mr *mr = to_vmr(ibmr); 280 struct pvrdma_dev *dev = to_vdev(ibmr->device); 281 union pvrdma_cmd_req req; 282 struct pvrdma_cmd_destroy_mr *cmd = &req.destroy_mr; 283 int ret; 284 285 memset(cmd, 0, sizeof(*cmd)); 286 cmd->hdr.cmd = PVRDMA_CMD_DESTROY_MR; 287 cmd->mr_handle = mr->mmr.mr_handle; 288 ret = pvrdma_cmd_post(dev, &req, NULL, 0); 289 if (ret < 0) 290 dev_warn(&dev->pdev->dev, 291 "could not deregister mem region, error: %d\n", ret); 292 293 pvrdma_page_dir_cleanup(dev, &mr->pdir); 294 ib_umem_release(mr->umem); 295 296 kfree(mr->pages); 297 kfree(mr); 298 299 return 0; 300 } 301 302 static int pvrdma_set_page(struct ib_mr *ibmr, u64 addr) 303 { 304 struct pvrdma_user_mr *mr = to_vmr(ibmr); 305 306 if (mr->npages == mr->max_pages) 307 return -ENOMEM; 308 309 mr->pages[mr->npages++] = addr; 310 return 0; 311 } 312 313 int pvrdma_map_mr_sg(struct ib_mr *ibmr, struct scatterlist *sg, int sg_nents, 314 unsigned int *sg_offset) 315 { 316 struct pvrdma_user_mr *mr = to_vmr(ibmr); 317 struct pvrdma_dev *dev = to_vdev(ibmr->device); 318 int ret; 319 320 mr->npages = 0; 321 322 ret = ib_sg_to_pages(ibmr, sg, sg_nents, sg_offset, pvrdma_set_page); 323 if (ret < 0) 324 dev_warn(&dev->pdev->dev, "could not map sg to pages\n"); 325 326 return ret; 327 } 328