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1// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
2/*
3 * Copyright(c) 2016 Intel Corporation.
4 */
5
6#include <linux/slab.h>
7#include <linux/vmalloc.h>
8#include <linux/mm.h>
9#include <rdma/uverbs_ioctl.h>
10#include "mmap.h"
11
12/**
13 * rvt_mmap_init - init link list and lock for mem map
14 * @rdi: rvt dev struct
15 */
16void rvt_mmap_init(struct rvt_dev_info *rdi)
17{
18 INIT_LIST_HEAD(&rdi->pending_mmaps);
19 spin_lock_init(&rdi->pending_lock);
20 rdi->mmap_offset = PAGE_SIZE;
21 spin_lock_init(&rdi->mmap_offset_lock);
22}
23
24/**
25 * rvt_release_mmap_info - free mmap info structure
26 * @ref: a pointer to the kref within struct rvt_mmap_info
27 */
28void rvt_release_mmap_info(struct kref *ref)
29{
30 struct rvt_mmap_info *ip =
31 container_of(ref, struct rvt_mmap_info, ref);
32 struct rvt_dev_info *rdi = ib_to_rvt(ip->context->device);
33
34 spin_lock_irq(&rdi->pending_lock);
35 list_del(&ip->pending_mmaps);
36 spin_unlock_irq(&rdi->pending_lock);
37
38 vfree(ip->obj);
39 kfree(ip);
40}
41
42static void rvt_vma_open(struct vm_area_struct *vma)
43{
44 struct rvt_mmap_info *ip = vma->vm_private_data;
45
46 kref_get(&ip->ref);
47}
48
49static void rvt_vma_close(struct vm_area_struct *vma)
50{
51 struct rvt_mmap_info *ip = vma->vm_private_data;
52
53 kref_put(&ip->ref, rvt_release_mmap_info);
54}
55
56static const struct vm_operations_struct rvt_vm_ops = {
57 .open = rvt_vma_open,
58 .close = rvt_vma_close,
59};
60
61/**
62 * rvt_mmap - create a new mmap region
63 * @context: the IB user context of the process making the mmap() call
64 * @vma: the VMA to be initialized
65 *
66 * Return: zero if the mmap is OK. Otherwise, return an errno.
67 */
68int rvt_mmap(struct ib_ucontext *context, struct vm_area_struct *vma)
69{
70 struct rvt_dev_info *rdi = ib_to_rvt(context->device);
71 unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
72 unsigned long size = vma->vm_end - vma->vm_start;
73 struct rvt_mmap_info *ip, *pp;
74 int ret = -EINVAL;
75
76 /*
77 * Search the device's list of objects waiting for a mmap call.
78 * Normally, this list is very short since a call to create a
79 * CQ, QP, or SRQ is soon followed by a call to mmap().
80 */
81 spin_lock_irq(&rdi->pending_lock);
82 list_for_each_entry_safe(ip, pp, &rdi->pending_mmaps,
83 pending_mmaps) {
84 /* Only the creator is allowed to mmap the object */
85 if (context != ip->context || (__u64)offset != ip->offset)
86 continue;
87 /* Don't allow a mmap larger than the object. */
88 if (size > ip->size)
89 break;
90
91 list_del_init(&ip->pending_mmaps);
92 spin_unlock_irq(&rdi->pending_lock);
93
94 ret = remap_vmalloc_range(vma, ip->obj, 0);
95 if (ret)
96 goto done;
97 vma->vm_ops = &rvt_vm_ops;
98 vma->vm_private_data = ip;
99 rvt_vma_open(vma);
100 goto done;
101 }
102 spin_unlock_irq(&rdi->pending_lock);
103done:
104 return ret;
105}
106
107/**
108 * rvt_create_mmap_info - allocate information for hfi1_mmap
109 * @rdi: rvt dev struct
110 * @size: size in bytes to map
111 * @udata: user data (must be valid!)
112 * @obj: opaque pointer to a cq, wq etc
113 *
114 * Return: rvt_mmap struct on success, ERR_PTR on failure
115 */
116struct rvt_mmap_info *rvt_create_mmap_info(struct rvt_dev_info *rdi, u32 size,
117 struct ib_udata *udata, void *obj)
118{
119 struct rvt_mmap_info *ip;
120
121 if (!udata)
122 return ERR_PTR(-EINVAL);
123
124 ip = kmalloc_node(sizeof(*ip), GFP_KERNEL, rdi->dparms.node);
125 if (!ip)
126 return ERR_PTR(-ENOMEM);
127
128 size = PAGE_ALIGN(size);
129
130 spin_lock_irq(&rdi->mmap_offset_lock);
131 if (rdi->mmap_offset == 0)
132 rdi->mmap_offset = ALIGN(PAGE_SIZE, SHMLBA);
133 ip->offset = rdi->mmap_offset;
134 rdi->mmap_offset += ALIGN(size, SHMLBA);
135 spin_unlock_irq(&rdi->mmap_offset_lock);
136
137 INIT_LIST_HEAD(&ip->pending_mmaps);
138 ip->size = size;
139 ip->context =
140 container_of(udata, struct uverbs_attr_bundle, driver_udata)
141 ->context;
142 ip->obj = obj;
143 kref_init(&ip->ref);
144
145 return ip;
146}
147
148/**
149 * rvt_update_mmap_info - update a mem map
150 * @rdi: rvt dev struct
151 * @ip: mmap info pointer
152 * @size: size to grow by
153 * @obj: opaque pointer to cq, wq, etc.
154 */
155void rvt_update_mmap_info(struct rvt_dev_info *rdi, struct rvt_mmap_info *ip,
156 u32 size, void *obj)
157{
158 size = PAGE_ALIGN(size);
159
160 spin_lock_irq(&rdi->mmap_offset_lock);
161 if (rdi->mmap_offset == 0)
162 rdi->mmap_offset = PAGE_SIZE;
163 ip->offset = rdi->mmap_offset;
164 rdi->mmap_offset += size;
165 spin_unlock_irq(&rdi->mmap_offset_lock);
166
167 ip->size = size;
168 ip->obj = obj;
169}
1/*
2 * Copyright(c) 2016 Intel Corporation.
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>
49#include <linux/vmalloc.h>
50#include <linux/mm.h>
51#include <asm/pgtable.h>
52#include "mmap.h"
53
54/**
55 * rvt_mmap_init - init link list and lock for mem map
56 * @rdi: rvt dev struct
57 */
58void 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 */
70void 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}
83
84static 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
91static 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
98static const struct vm_operations_struct rvt_vm_ops = {
99 .open = rvt_vma_open,
100 .close = rvt_vma_close,
101};
102
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
107 *
108 * Return: zero if the mmap is OK. Otherwise, return an errno.
109 */
110int rvt_mmap(struct ib_ucontext *context, struct vm_area_struct *vma)
111{
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);
145done:
146 return ret;
147}
148
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
157 */
158struct 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
165 ip = kmalloc_node(sizeof(*ip), GFP_KERNEL, rdi->dparms.node);
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)
173 rdi->mmap_offset = PAGE_SIZE;
174 ip->offset = rdi->mmap_offset;
175 rdi->mmap_offset += size;
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}
186
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 */
194void 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}