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 * @dmah: dma handle 108 * @udata: user data 109 * 110 * @return: ib_mr pointer on success, otherwise returns an errno. 111 */ 112 struct 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(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(-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(-EINVAL); 132 } 133 134 umem = ib_umem_get(pd->device, start, length, access_flags); 135 if (IS_ERR(umem)) { 136 dev_warn(&dev->pdev->dev, 137 "could not get umem for mem region\n"); 138 return ERR_CAST(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, &mr->pdir, npages, 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(&mr->pdir, mr->umem, 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(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, &rsp, 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; 191 192 err_pdir: 193 pvrdma_page_dir_cleanup(dev, &mr->pdir); 194 err_umem: 195 ib_umem_release(umem); 196 kfree(mr); 197 198 return ERR_PTR(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 */ 209 struct 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(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(-EINVAL); 224 225 mr = kzalloc(sizeof(*mr), GFP_KERNEL); 226 if (!mr) 227 return ERR_PTR(-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, &mr->pdir, max_num_sg, 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(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, &rsp, 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; 265 266 freepdir: 267 pvrdma_page_dir_cleanup(dev, &mr->pdir); 268 freepages: 269 kfree(mr->pages); 270 freemr: 271 kfree(mr); 272 return ERR_PTR(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 */ 282 int 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(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, NULL, 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, &mr->pdir); 299 ib_umem_release(mr->umem); 300 301 kfree(mr->pages); 302 kfree(mr); 303 304 return 0; 305 } 306 307 static 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 } 317 318 int 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(ibmr->device); 323 int ret; 324 325 mr->npages = 0; 326 327 ret = ib_sg_to_pages(ibmr, sg, sg_nents, sg_offset, 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