Roland Dreier | 225c7b1 | 2007-05-08 18:00:38 -0700 | [diff] [blame] | 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 <linux/slab.h> |
| 34 | |
| 35 | #include "mlx4_ib.h" |
| 36 | |
Roland Dreier | 225c7b1 | 2007-05-08 18:00:38 -0700 | [diff] [blame] | 37 | struct mlx4_ib_user_db_page { |
| 38 | struct list_head list; |
| 39 | struct ib_umem *umem; |
| 40 | unsigned long user_virt; |
| 41 | int refcnt; |
| 42 | }; |
| 43 | |
| 44 | int mlx4_ib_db_map_user(struct mlx4_ib_ucontext *context, unsigned long virt, |
Yevgeny Petrilin | 6296883 | 2008-04-23 11:55:45 -0700 | [diff] [blame] | 45 | struct mlx4_db *db) |
Roland Dreier | 225c7b1 | 2007-05-08 18:00:38 -0700 | [diff] [blame] | 46 | { |
| 47 | struct mlx4_ib_user_db_page *page; |
| 48 | struct ib_umem_chunk *chunk; |
| 49 | int err = 0; |
| 50 | |
| 51 | mutex_lock(&context->db_page_mutex); |
| 52 | |
| 53 | list_for_each_entry(page, &context->db_page_list, list) |
| 54 | if (page->user_virt == (virt & PAGE_MASK)) |
| 55 | goto found; |
| 56 | |
| 57 | page = kmalloc(sizeof *page, GFP_KERNEL); |
| 58 | if (!page) { |
| 59 | err = -ENOMEM; |
| 60 | goto out; |
| 61 | } |
| 62 | |
| 63 | page->user_virt = (virt & PAGE_MASK); |
| 64 | page->refcnt = 0; |
| 65 | page->umem = ib_umem_get(&context->ibucontext, virt & PAGE_MASK, |
Arthur Kepner | cb9fbc5 | 2008-04-29 01:00:34 -0700 | [diff] [blame] | 66 | PAGE_SIZE, 0, 0); |
Roland Dreier | 225c7b1 | 2007-05-08 18:00:38 -0700 | [diff] [blame] | 67 | if (IS_ERR(page->umem)) { |
| 68 | err = PTR_ERR(page->umem); |
| 69 | kfree(page); |
| 70 | goto out; |
| 71 | } |
| 72 | |
| 73 | list_add(&page->list, &context->db_page_list); |
| 74 | |
| 75 | found: |
| 76 | chunk = list_entry(page->umem->chunk_list.next, struct ib_umem_chunk, list); |
| 77 | db->dma = sg_dma_address(chunk->page_list) + (virt & ~PAGE_MASK); |
| 78 | db->u.user_page = page; |
| 79 | ++page->refcnt; |
| 80 | |
| 81 | out: |
| 82 | mutex_unlock(&context->db_page_mutex); |
| 83 | |
| 84 | return err; |
| 85 | } |
| 86 | |
Yevgeny Petrilin | 6296883 | 2008-04-23 11:55:45 -0700 | [diff] [blame] | 87 | void mlx4_ib_db_unmap_user(struct mlx4_ib_ucontext *context, struct mlx4_db *db) |
Roland Dreier | 225c7b1 | 2007-05-08 18:00:38 -0700 | [diff] [blame] | 88 | { |
| 89 | mutex_lock(&context->db_page_mutex); |
| 90 | |
| 91 | if (!--db->u.user_page->refcnt) { |
| 92 | list_del(&db->u.user_page->list); |
| 93 | ib_umem_release(db->u.user_page->umem); |
| 94 | kfree(db->u.user_page); |
| 95 | } |
| 96 | |
| 97 | mutex_unlock(&context->db_page_mutex); |
| 98 | } |