2 * Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.
3 * Copyright (c) 2015 System Fabric Works, Inc. All rights reserved.
5 * This software is available to you under a choice of one of two
6 * licenses. You may choose to be licensed under the terms of the GNU
7 * General Public License (GPL) Version 2, available from the file
8 * COPYING in the main directory of this source tree, or the
9 * OpenIB.org BSD license below:
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
19 * - Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials
22 * provided with the distribution.
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
34 #include <linux/module.h>
35 #include <linux/vmalloc.h>
37 #include <linux/errno.h>
38 #include <asm/pgtable.h>
42 #include "rxe_queue.h"
44 void rxe_mmap_release(struct kref *ref)
46 struct rxe_mmap_info *ip = container_of(ref,
47 struct rxe_mmap_info, ref);
48 struct rxe_dev *rxe = to_rdev(ip->context->device);
50 spin_lock_bh(&rxe->pending_lock);
52 if (!list_empty(&ip->pending_mmaps))
53 list_del(&ip->pending_mmaps);
55 spin_unlock_bh(&rxe->pending_lock);
57 vfree(ip->obj); /* buf */
62 * open and close keep track of how many times the memory region is mapped,
63 * to avoid releasing it.
65 static void rxe_vma_open(struct vm_area_struct *vma)
67 struct rxe_mmap_info *ip = vma->vm_private_data;
72 static void rxe_vma_close(struct vm_area_struct *vma)
74 struct rxe_mmap_info *ip = vma->vm_private_data;
76 kref_put(&ip->ref, rxe_mmap_release);
79 static struct vm_operations_struct rxe_vm_ops = {
81 .close = rxe_vma_close,
85 * rxe_mmap - create a new mmap region
86 * @context: the IB user context of the process making the mmap() call
87 * @vma: the VMA to be initialized
88 * Return zero if the mmap is OK. Otherwise, return an errno.
90 int rxe_mmap(struct ib_ucontext *context, struct vm_area_struct *vma)
92 struct rxe_dev *rxe = to_rdev(context->device);
93 unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
94 unsigned long size = vma->vm_end - vma->vm_start;
95 struct rxe_mmap_info *ip, *pp;
99 * Search the device's list of objects waiting for a mmap call.
100 * Normally, this list is very short since a call to create a
101 * CQ, QP, or SRQ is soon followed by a call to mmap().
103 spin_lock_bh(&rxe->pending_lock);
104 list_for_each_entry_safe(ip, pp, &rxe->pending_mmaps, pending_mmaps) {
105 if (context != ip->context || (__u64)offset != ip->info.offset)
108 /* Don't allow a mmap larger than the object. */
109 if (size > ip->info.size) {
110 pr_err("mmap region is larger than the object!\n");
111 spin_unlock_bh(&rxe->pending_lock);
118 pr_warn("unable to find pending mmap info\n");
119 spin_unlock_bh(&rxe->pending_lock);
124 list_del_init(&ip->pending_mmaps);
125 spin_unlock_bh(&rxe->pending_lock);
127 ret = remap_vmalloc_range(vma, ip->obj, 0);
129 pr_err("err %d from remap_vmalloc_range\n", ret);
133 vma->vm_ops = &rxe_vm_ops;
134 vma->vm_private_data = ip;
141 * Allocate information for rxe_mmap
143 struct rxe_mmap_info *rxe_create_mmap_info(struct rxe_dev *rxe,
145 struct ib_ucontext *context,
148 struct rxe_mmap_info *ip;
150 ip = kmalloc(sizeof(*ip), GFP_KERNEL);
154 size = PAGE_ALIGN(size);
156 spin_lock_bh(&rxe->mmap_offset_lock);
158 if (rxe->mmap_offset == 0)
159 rxe->mmap_offset = PAGE_SIZE;
161 ip->info.offset = rxe->mmap_offset;
162 rxe->mmap_offset += size;
164 spin_unlock_bh(&rxe->mmap_offset_lock);
166 INIT_LIST_HEAD(&ip->pending_mmaps);
167 ip->info.size = size;
168 ip->context = context;