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 } 185