Dennis Dalessandro | dc21752 | 2016-01-06 09:59:04 -0800 | [diff] [blame] | 1 | /* |
Dennis Dalessandro | fe31419 | 2016-01-22 13:04:58 -0800 | [diff] [blame] | 2 | * Copyright(c) 2016 Intel Corporation. |
Dennis Dalessandro | dc21752 | 2016-01-06 09:59:04 -0800 | [diff] [blame] | 3 | * |
| 4 | * This file is provided under a dual BSD/GPLv2 license. When using or |
| 5 | * redistributing this file, you may do so under either license. |
| 6 | * |
| 7 | * GPL LICENSE SUMMARY |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of version 2 of the GNU General Public License as |
| 11 | * published by the Free Software Foundation. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, but |
| 14 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 16 | * General Public License for more details. |
| 17 | * |
| 18 | * BSD LICENSE |
| 19 | * |
| 20 | * Redistribution and use in source and binary forms, with or without |
| 21 | * modification, are permitted provided that the following conditions |
| 22 | * are met: |
| 23 | * |
| 24 | * - Redistributions of source code must retain the above copyright |
| 25 | * notice, this list of conditions and the following disclaimer. |
| 26 | * - Redistributions in binary form must reproduce the above copyright |
| 27 | * notice, this list of conditions and the following disclaimer in |
| 28 | * the documentation and/or other materials provided with the |
| 29 | * distribution. |
| 30 | * - Neither the name of Intel Corporation nor the names of its |
| 31 | * contributors may be used to endorse or promote products derived |
| 32 | * from this software without specific prior written permission. |
| 33 | * |
| 34 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 35 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 36 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 37 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 38 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 39 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 40 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 41 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 42 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 43 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 44 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 45 | * |
| 46 | */ |
| 47 | |
| 48 | #include <linux/slab.h> |
Dennis Dalessandro | 822514d | 2016-01-06 10:04:57 -0800 | [diff] [blame] | 49 | #include <linux/vmalloc.h> |
| 50 | #include <linux/mm.h> |
| 51 | #include <asm/pgtable.h> |
Dennis Dalessandro | dc21752 | 2016-01-06 09:59:04 -0800 | [diff] [blame] | 52 | #include "mmap.h" |
| 53 | |
Dennis Dalessandro | 90793f7 | 2016-02-14 12:10:29 -0800 | [diff] [blame] | 54 | /** |
| 55 | * rvt_mmap_init - init link list and lock for mem map |
| 56 | * @rdi: rvt dev struct |
| 57 | */ |
Dennis Dalessandro | 822514d | 2016-01-06 10:04:57 -0800 | [diff] [blame] | 58 | void rvt_mmap_init(struct rvt_dev_info *rdi) |
| 59 | { |
| 60 | INIT_LIST_HEAD(&rdi->pending_mmaps); |
| 61 | spin_lock_init(&rdi->pending_lock); |
| 62 | rdi->mmap_offset = PAGE_SIZE; |
| 63 | spin_lock_init(&rdi->mmap_offset_lock); |
| 64 | } |
| 65 | |
| 66 | /** |
| 67 | * rvt_release_mmap_info - free mmap info structure |
| 68 | * @ref: a pointer to the kref within struct rvt_mmap_info |
| 69 | */ |
| 70 | void rvt_release_mmap_info(struct kref *ref) |
| 71 | { |
| 72 | struct rvt_mmap_info *ip = |
| 73 | container_of(ref, struct rvt_mmap_info, ref); |
| 74 | struct rvt_dev_info *rdi = ib_to_rvt(ip->context->device); |
| 75 | |
| 76 | spin_lock_irq(&rdi->pending_lock); |
| 77 | list_del(&ip->pending_mmaps); |
| 78 | spin_unlock_irq(&rdi->pending_lock); |
| 79 | |
| 80 | vfree(ip->obj); |
| 81 | kfree(ip); |
| 82 | } |
Dennis Dalessandro | 822514d | 2016-01-06 10:04:57 -0800 | [diff] [blame] | 83 | |
Dennis Dalessandro | 822514d | 2016-01-06 10:04:57 -0800 | [diff] [blame] | 84 | static void rvt_vma_open(struct vm_area_struct *vma) |
| 85 | { |
| 86 | struct rvt_mmap_info *ip = vma->vm_private_data; |
| 87 | |
| 88 | kref_get(&ip->ref); |
| 89 | } |
| 90 | |
| 91 | static void rvt_vma_close(struct vm_area_struct *vma) |
| 92 | { |
| 93 | struct rvt_mmap_info *ip = vma->vm_private_data; |
| 94 | |
| 95 | kref_put(&ip->ref, rvt_release_mmap_info); |
| 96 | } |
| 97 | |
| 98 | static const struct vm_operations_struct rvt_vm_ops = { |
| 99 | .open = rvt_vma_open, |
| 100 | .close = rvt_vma_close, |
| 101 | }; |
| 102 | |
Dennis Dalessandro | dc21752 | 2016-01-06 09:59:04 -0800 | [diff] [blame] | 103 | /** |
| 104 | * rvt_mmap - create a new mmap region |
| 105 | * @context: the IB user context of the process making the mmap() call |
| 106 | * @vma: the VMA to be initialized |
Dennis Dalessandro | 90793f7 | 2016-02-14 12:10:29 -0800 | [diff] [blame] | 107 | * |
| 108 | * Return: zero if the mmap is OK. Otherwise, return an errno. |
Dennis Dalessandro | dc21752 | 2016-01-06 09:59:04 -0800 | [diff] [blame] | 109 | */ |
| 110 | int rvt_mmap(struct ib_ucontext *context, struct vm_area_struct *vma) |
| 111 | { |
Dennis Dalessandro | 822514d | 2016-01-06 10:04:57 -0800 | [diff] [blame] | 112 | struct rvt_dev_info *rdi = ib_to_rvt(context->device); |
| 113 | unsigned long offset = vma->vm_pgoff << PAGE_SHIFT; |
| 114 | unsigned long size = vma->vm_end - vma->vm_start; |
| 115 | struct rvt_mmap_info *ip, *pp; |
| 116 | int ret = -EINVAL; |
| 117 | |
| 118 | /* |
| 119 | * Search the device's list of objects waiting for a mmap call. |
| 120 | * Normally, this list is very short since a call to create a |
| 121 | * CQ, QP, or SRQ is soon followed by a call to mmap(). |
| 122 | */ |
| 123 | spin_lock_irq(&rdi->pending_lock); |
| 124 | list_for_each_entry_safe(ip, pp, &rdi->pending_mmaps, |
| 125 | pending_mmaps) { |
| 126 | /* Only the creator is allowed to mmap the object */ |
| 127 | if (context != ip->context || (__u64)offset != ip->offset) |
| 128 | continue; |
| 129 | /* Don't allow a mmap larger than the object. */ |
| 130 | if (size > ip->size) |
| 131 | break; |
| 132 | |
| 133 | list_del_init(&ip->pending_mmaps); |
| 134 | spin_unlock_irq(&rdi->pending_lock); |
| 135 | |
| 136 | ret = remap_vmalloc_range(vma, ip->obj, 0); |
| 137 | if (ret) |
| 138 | goto done; |
| 139 | vma->vm_ops = &rvt_vm_ops; |
| 140 | vma->vm_private_data = ip; |
| 141 | rvt_vma_open(vma); |
| 142 | goto done; |
| 143 | } |
| 144 | spin_unlock_irq(&rdi->pending_lock); |
| 145 | done: |
| 146 | return ret; |
Dennis Dalessandro | dc21752 | 2016-01-06 09:59:04 -0800 | [diff] [blame] | 147 | } |
Dennis Dalessandro | 822514d | 2016-01-06 10:04:57 -0800 | [diff] [blame] | 148 | |
Dennis Dalessandro | 90793f7 | 2016-02-14 12:10:29 -0800 | [diff] [blame] | 149 | /** |
| 150 | * rvt_create_mmap_info - allocate information for hfi1_mmap |
| 151 | * @rdi: rvt dev struct |
| 152 | * @size: size in bytes to map |
| 153 | * @context: user context |
| 154 | * @obj: opaque pointer to a cq, wq etc |
| 155 | * |
| 156 | * Return: rvt_mmap struct on success |
Dennis Dalessandro | 822514d | 2016-01-06 10:04:57 -0800 | [diff] [blame] | 157 | */ |
| 158 | struct rvt_mmap_info *rvt_create_mmap_info(struct rvt_dev_info *rdi, |
| 159 | u32 size, |
| 160 | struct ib_ucontext *context, |
| 161 | void *obj) |
| 162 | { |
| 163 | struct rvt_mmap_info *ip; |
| 164 | |
Mitko Haralanov | d1b697b | 2016-02-03 14:14:54 -0800 | [diff] [blame] | 165 | ip = kmalloc_node(sizeof(*ip), GFP_KERNEL, rdi->dparms.node); |
Dennis Dalessandro | 822514d | 2016-01-06 10:04:57 -0800 | [diff] [blame] | 166 | if (!ip) |
| 167 | return ip; |
| 168 | |
| 169 | size = PAGE_ALIGN(size); |
| 170 | |
| 171 | spin_lock_irq(&rdi->mmap_offset_lock); |
| 172 | if (rdi->mmap_offset == 0) |
Jason Gunthorpe | cb88645 | 2017-03-10 11:34:20 -0700 | [diff] [blame] | 173 | rdi->mmap_offset = ALIGN(PAGE_SIZE, SHMLBA); |
Dennis Dalessandro | 822514d | 2016-01-06 10:04:57 -0800 | [diff] [blame] | 174 | ip->offset = rdi->mmap_offset; |
Jason Gunthorpe | cb88645 | 2017-03-10 11:34:20 -0700 | [diff] [blame] | 175 | rdi->mmap_offset += ALIGN(size, SHMLBA); |
Dennis Dalessandro | 822514d | 2016-01-06 10:04:57 -0800 | [diff] [blame] | 176 | spin_unlock_irq(&rdi->mmap_offset_lock); |
| 177 | |
| 178 | INIT_LIST_HEAD(&ip->pending_mmaps); |
| 179 | ip->size = size; |
| 180 | ip->context = context; |
| 181 | ip->obj = obj; |
| 182 | kref_init(&ip->ref); |
| 183 | |
| 184 | return ip; |
| 185 | } |
Dennis Dalessandro | 822514d | 2016-01-06 10:04:57 -0800 | [diff] [blame] | 186 | |
Dennis Dalessandro | 90793f7 | 2016-02-14 12:10:29 -0800 | [diff] [blame] | 187 | /** |
| 188 | * rvt_update_mmap_info - update a mem map |
| 189 | * @rdi: rvt dev struct |
| 190 | * @ip: mmap info pointer |
| 191 | * @size: size to grow by |
| 192 | * @obj: opaque pointer to cq, wq, etc. |
| 193 | */ |
Dennis Dalessandro | 822514d | 2016-01-06 10:04:57 -0800 | [diff] [blame] | 194 | void rvt_update_mmap_info(struct rvt_dev_info *rdi, struct rvt_mmap_info *ip, |
| 195 | u32 size, void *obj) |
| 196 | { |
| 197 | size = PAGE_ALIGN(size); |
| 198 | |
| 199 | spin_lock_irq(&rdi->mmap_offset_lock); |
| 200 | if (rdi->mmap_offset == 0) |
| 201 | rdi->mmap_offset = PAGE_SIZE; |
| 202 | ip->offset = rdi->mmap_offset; |
| 203 | rdi->mmap_offset += size; |
| 204 | spin_unlock_irq(&rdi->mmap_offset_lock); |
| 205 | |
| 206 | ip->size = size; |
| 207 | ip->obj = obj; |
| 208 | } |