projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 225c7b1f RD |
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 | ||
| 225c7b1f RD |
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, | |
| 6296883c | 45 | struct mlx4_db *db) |
| 225c7b1f RD |
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, | |
| cb9fbc5c | 66 | PAGE_SIZE, 0, 0); |
| 225c7b1f RD |
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 | ||
| 6296883c | 87 | void mlx4_ib_db_unmap_user(struct mlx4_ib_ucontext *context, struct mlx4_db *db) |
| 225c7b1f RD |
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 | } |