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1/*2 * Copyright (c) 2012-2016 VMware, Inc. All rights reserved.3 *4 * This program is free software; you can redistribute it and/or5 * modify it under the terms of EITHER the GNU General Public License6 * version 2 as published by the Free Software Foundation or the BSD7 * 2-Clause License. This program is distributed in the hope that it8 * will be useful, but WITHOUT ANY WARRANTY; WITHOUT EVEN THE IMPLIED9 * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.10 * See the GNU General Public License version 2 for more details at11 * 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 License14 * along with this program available in the file COPYING in the main15 * directory of this source tree.16 *17 * The BSD 2-Clause License18 *19 * Redistribution and use in source and binary forms, with or20 * without modification, are permitted provided that the following21 * conditions are met:22 *23 * - Redistributions of source code must retain the above24 * copyright notice, this list of conditions and the following25 * disclaimer.26 *27 * - Redistributions in binary form must reproduce the above28 * copyright notice, this list of conditions and the following29 * disclaimer in the documentation and/or other materials30 * provided with the distribution.31 *32 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS33 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT34 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS35 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE36 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,37 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES38 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR39 * 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 ADVISED43 * 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 region53 * @pd: protection domain54 * @acc: access flags55 *56 * @return: ib_mr pointer on success, otherwise returns an errno.57 */58struct 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 region102 * @pd: protection domain103 * @start: starting address104 * @length: length of region105 * @virt_addr: I/O virtual address106 * @access_flags: access flags for memory region107 * @udata: user data108 *109 * @return: ib_mr pointer on success, otherwise returns an errno.110 */111struct 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 187err_pdir:188 pvrdma_page_dir_cleanup(dev, &mr->pdir);189err_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 region198 * @pd: protection domain199 * @mr_type: type of memory region200 * @max_num_sg: maximum number of pages201 *202 * @return: ib_mr pointer on success, otherwise returns an errno.203 */204struct 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 261freepdir:262 pvrdma_page_dir_cleanup(dev, &mr->pdir);263freepages:264 kfree(mr->pages);265freemr:266 kfree(mr);267 return ERR_PTR(ret);268}269 270/**271 * pvrdma_dereg_mr - deregister a memory region272 * @ibmr: memory region273 * @udata: pointer to user data274 *275 * @return: 0 on success.276 */277int 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 302static 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 313int 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