2 * Copyright (c) 2006 QLogic, Inc. All rights reserved.
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:
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
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.
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
33 #include <linux/config.h>
34 #include <linux/module.h>
35 #include <linux/vmalloc.h>
37 #include <linux/errno.h>
38 #include <asm/pgtable.h>
40 #include "ipath_verbs.h"
43 * ipath_release_mmap_info - free mmap info structure
44 * @ref: a pointer to the kref within struct ipath_mmap_info
46 void ipath_release_mmap_info(struct kref
*ref
)
48 struct ipath_mmap_info
*ip
=
49 container_of(ref
, struct ipath_mmap_info
, ref
);
56 * open and close keep track of how many times the CQ is mapped,
57 * to avoid releasing it.
59 static void ipath_vma_open(struct vm_area_struct
*vma
)
61 struct ipath_mmap_info
*ip
= vma
->vm_private_data
;
67 static void ipath_vma_close(struct vm_area_struct
*vma
)
69 struct ipath_mmap_info
*ip
= vma
->vm_private_data
;
72 kref_put(&ip
->ref
, ipath_release_mmap_info
);
75 static struct vm_operations_struct ipath_vm_ops
= {
76 .open
= ipath_vma_open
,
77 .close
= ipath_vma_close
,
81 * ipath_mmap - create a new mmap region
82 * @context: the IB user context of the process making the mmap() call
83 * @vma: the VMA to be initialized
84 * Return zero if the mmap is OK. Otherwise, return an errno.
86 int ipath_mmap(struct ib_ucontext
*context
, struct vm_area_struct
*vma
)
88 struct ipath_ibdev
*dev
= to_idev(context
->device
);
89 unsigned long offset
= vma
->vm_pgoff
<< PAGE_SHIFT
;
90 unsigned long size
= vma
->vm_end
- vma
->vm_start
;
91 struct ipath_mmap_info
*ip
, **pp
;
95 * Search the device's list of objects waiting for a mmap call.
96 * Normally, this list is very short since a call to create a
97 * CQ, QP, or SRQ is soon followed by a call to mmap().
99 spin_lock_irq(&dev
->pending_lock
);
100 for (pp
= &dev
->pending_mmaps
; (ip
= *pp
); pp
= &ip
->next
) {
101 /* Only the creator is allowed to mmap the object */
102 if (context
!= ip
->context
|| (void *) offset
!= ip
->obj
)
104 /* Don't allow a mmap larger than the object. */
109 spin_unlock_irq(&dev
->pending_lock
);
111 ret
= remap_vmalloc_range(vma
, ip
->obj
, 0);
114 vma
->vm_ops
= &ipath_vm_ops
;
115 vma
->vm_private_data
= ip
;
119 spin_unlock_irq(&dev
->pending_lock
);