2 * Copyright (c) 2006, 2007, 2008, 2009 QLogic Corporation. All rights reserved.
3 * Copyright (c) 2003, 2004, 2005, 2006 PathScale, 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
35 #include <linux/device.h>
39 static void __qib_release_user_pages(struct page
**p
, size_t num_pages
,
44 for (i
= 0; i
< num_pages
; i
++) {
46 set_page_dirty_lock(p
[i
]);
52 * Call with current->mm->mmap_sem held.
54 static int __qib_get_user_pages(unsigned long start_page
, size_t num_pages
,
55 struct page
**p
, struct vm_area_struct
**vma
)
57 unsigned long lock_limit
;
61 lock_limit
= rlimit(RLIMIT_MEMLOCK
) >> PAGE_SHIFT
;
63 if (num_pages
> lock_limit
&& !capable(CAP_IPC_LOCK
)) {
68 for (got
= 0; got
< num_pages
; got
+= ret
) {
69 ret
= get_user_pages(current
, current
->mm
,
70 start_page
+ got
* PAGE_SIZE
,
71 num_pages
- got
, 1, 1,
77 current
->mm
->pinned_vm
+= num_pages
;
83 __qib_release_user_pages(p
, got
, 0);
89 * qib_map_page - a safety wrapper around pci_map_page()
91 * A dma_addr of all 0's is interpreted by the chip as "disabled".
92 * Unfortunately, it can also be a valid dma_addr returned on some
95 * The powerpc iommu assigns dma_addrs in ascending order, so we don't
96 * have to bother with retries or mapping a dummy page to insure we
97 * don't just get the same mapping again.
99 * I'm sure we won't be so lucky with other iommu's, so FIXME.
101 dma_addr_t
qib_map_page(struct pci_dev
*hwdev
, struct page
*page
,
102 unsigned long offset
, size_t size
, int direction
)
106 phys
= pci_map_page(hwdev
, page
, offset
, size
, direction
);
109 pci_unmap_page(hwdev
, phys
, size
, direction
);
110 phys
= pci_map_page(hwdev
, page
, offset
, size
, direction
);
112 * FIXME: If we get 0 again, we should keep this page,
113 * map another, then free the 0 page.
121 * qib_get_user_pages - lock user pages into memory
122 * @start_page: the start page
123 * @num_pages: the number of pages
124 * @p: the output page structures
126 * This function takes a given start page (page aligned user virtual
127 * address) and pins it and the following specified number of pages. For
128 * now, num_pages is always 1, but that will probably change at some point
129 * (because caller is doing expected sends on a single virtually contiguous
130 * buffer, so we can do all pages at once).
132 int qib_get_user_pages(unsigned long start_page
, size_t num_pages
,
137 down_write(¤t
->mm
->mmap_sem
);
139 ret
= __qib_get_user_pages(start_page
, num_pages
, p
, NULL
);
141 up_write(¤t
->mm
->mmap_sem
);
146 void qib_release_user_pages(struct page
**p
, size_t num_pages
)
148 if (current
->mm
) /* during close after signal, mm can be NULL */
149 down_write(¤t
->mm
->mmap_sem
);
151 __qib_release_user_pages(p
, num_pages
, 1);
154 current
->mm
->pinned_vm
-= num_pages
;
155 up_write(¤t
->mm
->mmap_sem
);