Mike Marciniszyn | 7724105 | 2015-07-30 15:17:43 -0400 | [diff] [blame] | 1 | /* |
| 2 | * |
| 3 | * This file is provided under a dual BSD/GPLv2 license. When using or |
| 4 | * redistributing this file, you may do so under either license. |
| 5 | * |
| 6 | * GPL LICENSE SUMMARY |
| 7 | * |
| 8 | * Copyright(c) 2015 Intel Corporation. |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of version 2 of the GNU General Public License as |
| 12 | * published by the Free Software Foundation. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, but |
| 15 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 17 | * General Public License for more details. |
| 18 | * |
| 19 | * BSD LICENSE |
| 20 | * |
| 21 | * Copyright(c) 2015 Intel Corporation. |
| 22 | * |
| 23 | * Redistribution and use in source and binary forms, with or without |
| 24 | * modification, are permitted provided that the following conditions |
| 25 | * are met: |
| 26 | * |
| 27 | * - Redistributions of source code must retain the above copyright |
| 28 | * notice, this list of conditions and the following disclaimer. |
| 29 | * - Redistributions in binary form must reproduce the above copyright |
| 30 | * notice, this list of conditions and the following disclaimer in |
| 31 | * the documentation and/or other materials provided with the |
| 32 | * distribution. |
| 33 | * - Neither the name of Intel Corporation nor the names of its |
| 34 | * contributors may be used to endorse or promote products derived |
| 35 | * from this software without specific prior written permission. |
| 36 | * |
| 37 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 38 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 39 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 40 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 41 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 42 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 43 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 44 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 45 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 46 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 47 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 48 | * |
| 49 | */ |
| 50 | |
| 51 | #include <linux/module.h> |
| 52 | #include <linux/slab.h> |
| 53 | #include <linux/vmalloc.h> |
| 54 | #include <linux/mm.h> |
| 55 | #include <linux/errno.h> |
| 56 | #include <asm/pgtable.h> |
| 57 | |
| 58 | #include "verbs.h" |
| 59 | |
| 60 | /** |
| 61 | * hfi1_release_mmap_info - free mmap info structure |
| 62 | * @ref: a pointer to the kref within struct hfi1_mmap_info |
| 63 | */ |
| 64 | void hfi1_release_mmap_info(struct kref *ref) |
| 65 | { |
| 66 | struct hfi1_mmap_info *ip = |
| 67 | container_of(ref, struct hfi1_mmap_info, ref); |
| 68 | struct hfi1_ibdev *dev = to_idev(ip->context->device); |
| 69 | |
| 70 | spin_lock_irq(&dev->pending_lock); |
| 71 | list_del(&ip->pending_mmaps); |
| 72 | spin_unlock_irq(&dev->pending_lock); |
| 73 | |
| 74 | vfree(ip->obj); |
| 75 | kfree(ip); |
| 76 | } |
| 77 | |
| 78 | /* |
| 79 | * open and close keep track of how many times the CQ is mapped, |
| 80 | * to avoid releasing it. |
| 81 | */ |
| 82 | static void hfi1_vma_open(struct vm_area_struct *vma) |
| 83 | { |
| 84 | struct hfi1_mmap_info *ip = vma->vm_private_data; |
| 85 | |
| 86 | kref_get(&ip->ref); |
| 87 | } |
| 88 | |
| 89 | static void hfi1_vma_close(struct vm_area_struct *vma) |
| 90 | { |
| 91 | struct hfi1_mmap_info *ip = vma->vm_private_data; |
| 92 | |
| 93 | kref_put(&ip->ref, hfi1_release_mmap_info); |
| 94 | } |
| 95 | |
| 96 | static struct vm_operations_struct hfi1_vm_ops = { |
| 97 | .open = hfi1_vma_open, |
| 98 | .close = hfi1_vma_close, |
| 99 | }; |
| 100 | |
| 101 | /** |
| 102 | * hfi1_mmap - create a new mmap region |
| 103 | * @context: the IB user context of the process making the mmap() call |
| 104 | * @vma: the VMA to be initialized |
| 105 | * Return zero if the mmap is OK. Otherwise, return an errno. |
| 106 | */ |
| 107 | int hfi1_mmap(struct ib_ucontext *context, struct vm_area_struct *vma) |
| 108 | { |
| 109 | struct hfi1_ibdev *dev = to_idev(context->device); |
| 110 | unsigned long offset = vma->vm_pgoff << PAGE_SHIFT; |
| 111 | unsigned long size = vma->vm_end - vma->vm_start; |
| 112 | struct hfi1_mmap_info *ip, *pp; |
| 113 | int ret = -EINVAL; |
| 114 | |
| 115 | /* |
| 116 | * Search the device's list of objects waiting for a mmap call. |
| 117 | * Normally, this list is very short since a call to create a |
| 118 | * CQ, QP, or SRQ is soon followed by a call to mmap(). |
| 119 | */ |
| 120 | spin_lock_irq(&dev->pending_lock); |
| 121 | list_for_each_entry_safe(ip, pp, &dev->pending_mmaps, |
| 122 | pending_mmaps) { |
| 123 | /* Only the creator is allowed to mmap the object */ |
| 124 | if (context != ip->context || (__u64) offset != ip->offset) |
| 125 | continue; |
| 126 | /* Don't allow a mmap larger than the object. */ |
| 127 | if (size > ip->size) |
| 128 | break; |
| 129 | |
| 130 | list_del_init(&ip->pending_mmaps); |
| 131 | spin_unlock_irq(&dev->pending_lock); |
| 132 | |
| 133 | ret = remap_vmalloc_range(vma, ip->obj, 0); |
| 134 | if (ret) |
| 135 | goto done; |
| 136 | vma->vm_ops = &hfi1_vm_ops; |
| 137 | vma->vm_private_data = ip; |
| 138 | hfi1_vma_open(vma); |
| 139 | goto done; |
| 140 | } |
| 141 | spin_unlock_irq(&dev->pending_lock); |
| 142 | done: |
| 143 | return ret; |
| 144 | } |
| 145 | |
| 146 | /* |
| 147 | * Allocate information for hfi1_mmap |
| 148 | */ |
| 149 | struct hfi1_mmap_info *hfi1_create_mmap_info(struct hfi1_ibdev *dev, |
| 150 | u32 size, |
| 151 | struct ib_ucontext *context, |
| 152 | void *obj) { |
| 153 | struct hfi1_mmap_info *ip; |
| 154 | |
| 155 | ip = kmalloc(sizeof(*ip), GFP_KERNEL); |
| 156 | if (!ip) |
| 157 | goto bail; |
| 158 | |
| 159 | size = PAGE_ALIGN(size); |
| 160 | |
| 161 | spin_lock_irq(&dev->mmap_offset_lock); |
| 162 | if (dev->mmap_offset == 0) |
| 163 | dev->mmap_offset = PAGE_SIZE; |
| 164 | ip->offset = dev->mmap_offset; |
| 165 | dev->mmap_offset += size; |
| 166 | spin_unlock_irq(&dev->mmap_offset_lock); |
| 167 | |
| 168 | INIT_LIST_HEAD(&ip->pending_mmaps); |
| 169 | ip->size = size; |
| 170 | ip->context = context; |
| 171 | ip->obj = obj; |
| 172 | kref_init(&ip->ref); |
| 173 | |
| 174 | bail: |
| 175 | return ip; |
| 176 | } |
| 177 | |
| 178 | void hfi1_update_mmap_info(struct hfi1_ibdev *dev, struct hfi1_mmap_info *ip, |
| 179 | u32 size, void *obj) |
| 180 | { |
| 181 | size = PAGE_ALIGN(size); |
| 182 | |
| 183 | spin_lock_irq(&dev->mmap_offset_lock); |
| 184 | if (dev->mmap_offset == 0) |
| 185 | dev->mmap_offset = PAGE_SIZE; |
| 186 | ip->offset = dev->mmap_offset; |
| 187 | dev->mmap_offset += size; |
| 188 | spin_unlock_irq(&dev->mmap_offset_lock); |
| 189 | |
| 190 | ip->size = size; |
| 191 | ip->obj = obj; |
| 192 | } |