drivers/infiniband/hw/mlx4/mr.c

   1 /*
   2  * Copyright (c) 2007 Cisco Systems, Inc. All rights reserved.
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  */
  32
  33 #include "mlx4_ib.h"
  34
  35 static u32 convert_access(int acc)
  36 {
  37         return (acc & IB_ACCESS_REMOTE_ATOMIC ? MLX4_PERM_ATOMIC       : 0) |
  38                (acc & IB_ACCESS_REMOTE_WRITE  ? MLX4_PERM_REMOTE_WRITE : 0) |
  39                (acc & IB_ACCESS_REMOTE_READ   ? MLX4_PERM_REMOTE_READ  : 0) |
  40                (acc & IB_ACCESS_LOCAL_WRITE   ? MLX4_PERM_LOCAL_WRITE  : 0) |
  41                MLX4_PERM_LOCAL_READ;
  42 }
  43
  44 struct ib_mr *mlx4_ib_get_dma_mr(struct ib_pd *pd, int acc)
  45 {
  46         struct mlx4_ib_mr *mr;
  47         int err;
  48
  49         mr = kmalloc(sizeof *mr, GFP_KERNEL);
  50         if (!mr)
  51                 return ERR_PTR(-ENOMEM);
  52
  53         err = mlx4_mr_alloc(to_mdev(pd->device)->dev, to_mpd(pd)->pdn, 0,
  54                             ~0ull, convert_access(acc), 0, 0, &mr->mmr);
  55         if (err)
  56                 goto err_free;
  57
  58         err = mlx4_mr_enable(to_mdev(pd->device)->dev, &mr->mmr);
  59         if (err)
  60                 goto err_mr;
  61
  62         mr->ibmr.rkey = mr->ibmr.lkey = mr->mmr.key;
  63         mr->umem = NULL;
  64
  65         return &mr->ibmr;
  66
  67 err_mr:
  68         mlx4_mr_free(to_mdev(pd->device)->dev, &mr->mmr);
  69
  70 err_free:
  71         kfree(mr);
  72
  73         return ERR_PTR(err);
  74 }
  75
  76 int mlx4_ib_umem_write_mtt(struct mlx4_ib_dev *dev, struct mlx4_mtt *mtt,
  77                            struct ib_umem *umem)
  78 {
  79         u64 *pages;
  80         struct ib_umem_chunk *chunk;
  81         int i, j, k;
  82         int n;
  83         int len;
  84         int err = 0;
  85
  86         pages = (u64 *) __get_free_page(GFP_KERNEL);
  87         if (!pages)
  88                 return -ENOMEM;
  89
  90         i = n = 0;
  91
  92         list_for_each_entry(chunk, &umem->chunk_list, list)
  93                 for (j = 0; j < chunk->nmap; ++j) {
  94                         len = sg_dma_len(&chunk->page_list[j]) >> mtt->page_shift;
  95                         for (k = 0; k < len; ++k) {
  96                                 pages[i++] = sg_dma_address(&chunk->page_list[j]) +
  97                                         umem->page_size * k;
  98                                 /*
  99                                  * Be friendly to WRITE_MTT firmware
 100                                  * command, and pass it chunks of
 101                                  * appropriate size.
 102                                  */
 103                                 if (i == PAGE_SIZE / sizeof (u64) - 2) {
 104                                         err = mlx4_write_mtt(dev->dev, mtt, n,
 105                                                              i, pages);
 106                                         if (err)
 107                                                 goto out;
 108                                         n += i;
 109                                         i = 0;
 110                                 }
 111                         }
 112                 }
 113
 114         if (i)
 115                 err = mlx4_write_mtt(dev->dev, mtt, n, i, pages);
 116
 117 out:
 118         free_page((unsigned long) pages);
 119         return err;
 120 }
 121
 122 struct ib_mr *mlx4_ib_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
 123                                   u64 virt_addr, int access_flags,
 124                                   struct ib_udata *udata)
 125 {
 126         struct mlx4_ib_dev *dev = to_mdev(pd->device);
 127         struct mlx4_ib_mr *mr;
 128         int shift;
 129         int err;
 130         int n;
 131
 132         mr = kmalloc(sizeof *mr, GFP_KERNEL);
 133         if (!mr)
 134                 return ERR_PTR(-ENOMEM);
 135
 136         mr->umem = ib_umem_get(pd->uobject->context, start, length, access_flags);
 137         if (IS_ERR(mr->umem)) {
 138                 err = PTR_ERR(mr->umem);
 139                 goto err_free;
 140         }
 141
 142         n = ib_umem_page_count(mr->umem);
 143         shift = ilog2(mr->umem->page_size);
 144
 145         err = mlx4_mr_alloc(dev->dev, to_mpd(pd)->pdn, virt_addr, length,
 146                             convert_access(access_flags), n, shift, &mr->mmr);
 147         if (err)
 148                 goto err_umem;
 149
 150         err = mlx4_ib_umem_write_mtt(dev, &mr->mmr.mtt, mr->umem);
 151         if (err)
 152                 goto err_mr;
 153
 154         err = mlx4_mr_enable(dev->dev, &mr->mmr);
 155         if (err)
 156                 goto err_mr;
 157
 158         mr->ibmr.rkey = mr->ibmr.lkey = mr->mmr.key;
 159
 160         return &mr->ibmr;
 161
 162 err_mr:
 163         mlx4_mr_free(to_mdev(pd->device)->dev, &mr->mmr);
 164
 165 err_umem:
 166         ib_umem_release(mr->umem);
 167
 168 err_free:
 169         kfree(mr);
 170
 171         return ERR_PTR(err);
 172 }
 173
 174 int mlx4_ib_dereg_mr(struct ib_mr *ibmr)
 175 {
 176         struct mlx4_ib_mr *mr = to_mmr(ibmr);
 177
 178         mlx4_mr_free(to_mdev(ibmr->device)->dev, &mr->mmr);
 179         if (mr->umem)
 180                 ib_umem_release(mr->umem);
 181         kfree(mr);
 182
 183         return 0;
 184 }