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:
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12 * without modification, are permitted provided that the following
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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
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22 * provided with the distribution.
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
35 #include <linux/sched/signal.h>
36 #include <linux/device.h>
40 static void __qib_release_user_pages(struct page **p, size_t num_pages,
44 put_user_pages_dirty_lock(p, num_pages);
46 put_user_pages(p, num_pages);
50 * qib_map_page - a safety wrapper around pci_map_page()
52 * A dma_addr of all 0's is interpreted by the chip as "disabled".
53 * Unfortunately, it can also be a valid dma_addr returned on some
56 * The powerpc iommu assigns dma_addrs in ascending order, so we don't
57 * have to bother with retries or mapping a dummy page to insure we
58 * don't just get the same mapping again.
60 * I'm sure we won't be so lucky with other iommu's, so FIXME.
62 int qib_map_page(struct pci_dev *hwdev, struct page *page, dma_addr_t *daddr)
66 phys = pci_map_page(hwdev, page, 0, PAGE_SIZE, PCI_DMA_FROMDEVICE);
67 if (pci_dma_mapping_error(hwdev, phys))
71 pci_unmap_page(hwdev, phys, PAGE_SIZE, PCI_DMA_FROMDEVICE);
72 phys = pci_map_page(hwdev, page, 0, PAGE_SIZE,
74 if (pci_dma_mapping_error(hwdev, phys))
77 * FIXME: If we get 0 again, we should keep this page,
78 * map another, then free the 0 page.
86 * qib_get_user_pages - lock user pages into memory
87 * @start_page: the start page
88 * @num_pages: the number of pages
89 * @p: the output page structures
91 * This function takes a given start page (page aligned user virtual
92 * address) and pins it and the following specified number of pages. For
93 * now, num_pages is always 1, but that will probably change at some point
94 * (because caller is doing expected sends on a single virtually contiguous
95 * buffer, so we can do all pages at once).
97 int qib_get_user_pages(unsigned long start_page, size_t num_pages,
100 unsigned long locked, lock_limit;
104 lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
105 locked = atomic64_add_return(num_pages, ¤t->mm->pinned_vm);
107 if (locked > lock_limit && !capable(CAP_IPC_LOCK)) {
112 down_read(¤t->mm->mmap_sem);
113 for (got = 0; got < num_pages; got += ret) {
114 ret = get_user_pages(start_page + got * PAGE_SIZE,
116 FOLL_LONGTERM | FOLL_WRITE | FOLL_FORCE,
119 up_read(¤t->mm->mmap_sem);
123 up_read(¤t->mm->mmap_sem);
127 __qib_release_user_pages(p, got, 0);
129 atomic64_sub(num_pages, ¤t->mm->pinned_vm);
133 void qib_release_user_pages(struct page **p, size_t num_pages)
135 __qib_release_user_pages(p, num_pages, 1);
137 /* during close after signal, mm can be NULL */
139 atomic64_sub(num_pages, ¤t->mm->pinned_vm);