LXR linux/drivers/infiniband/hw/vmw_pvrdma/pvrdma

   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 */
  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 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 */
 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;
 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->uobject->context, start,
 130                           length, access_flags, 0);
 131        if (IS_ERR(umem)) {
 132                dev_warn(&dev->pdev->dev,
 133                         "could not get umem for mem region\n");
 134                return ERR_CAST(umem);
 135        }
 136
 137        if (umem->npages < 0 || umem->npages > PVRDMA_PAGE_DIR_MAX_PAGES) {
 138                dev_warn(&dev->pdev->dev, "overflow %d pages in mem region\n",
 139                         umem->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, umem->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 = umem->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 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 */
 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 region
 272 * @ibmr: memory region
 273 *
 274 * @return: 0 on success.
 275 */
 276int pvrdma_dereg_mr(struct ib_mr *ibmr)
 277{
 278        struct pvrdma_user_mr *mr = to_vmr(ibmr);
 279        struct pvrdma_dev *dev = to_vdev(ibmr->device);
 280        union pvrdma_cmd_req req;
 281        struct pvrdma_cmd_destroy_mr *cmd = &req.destroy_mr;
 282        int ret;
 283
 284        memset(cmd, 0, sizeof(*cmd));
 285        cmd->hdr.cmd = PVRDMA_CMD_DESTROY_MR;
 286        cmd->mr_handle = mr->mmr.mr_handle;
 287        ret = pvrdma_cmd_post(dev, &req, NULL, 0);
 288        if (ret < 0)
 289                dev_warn(&dev->pdev->dev,
 290                         "could not deregister mem region, error: %d\n", ret);
 291
 292        pvrdma_page_dir_cleanup(dev, &mr->pdir);
 293        if (mr->umem)
 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