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,
45 for (i = 0; i < num_pages; i++) {
47 set_page_dirty_lock(p[i]);
53 * qib_map_page - a safety wrapper around pci_map_page()
55 * A dma_addr of all 0's is interpreted by the chip as "disabled".
56 * Unfortunately, it can also be a valid dma_addr returned on some
59 * The powerpc iommu assigns dma_addrs in ascending order, so we don't
60 * have to bother with retries or mapping a dummy page to insure we
61 * don't just get the same mapping again.
63 * I'm sure we won't be so lucky with other iommu's, so FIXME.
65 int qib_map_page(struct pci_dev *hwdev, struct page *page, dma_addr_t *daddr)
69 phys = pci_map_page(hwdev, page, 0, PAGE_SIZE, PCI_DMA_FROMDEVICE);
70 if (pci_dma_mapping_error(hwdev, phys))
74 pci_unmap_page(hwdev, phys, PAGE_SIZE, PCI_DMA_FROMDEVICE);
75 phys = pci_map_page(hwdev, page, 0, PAGE_SIZE,
77 if (pci_dma_mapping_error(hwdev, phys))
80 * FIXME: If we get 0 again, we should keep this page,
81 * map another, then free the 0 page.
89 * qib_get_user_pages - lock user pages into memory
90 * @start_page: the start page
91 * @num_pages: the number of pages
92 * @p: the output page structures
94 * This function takes a given start page (page aligned user virtual
95 * address) and pins it and the following specified number of pages. For
96 * now, num_pages is always 1, but that will probably change at some point
97 * (because caller is doing expected sends on a single virtually contiguous
98 * buffer, so we can do all pages at once).
100 int qib_get_user_pages(unsigned long start_page, size_t num_pages,
103 unsigned long locked, lock_limit;
107 lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
108 locked = atomic64_add_return(num_pages, ¤t->mm->pinned_vm);
110 if (locked > lock_limit && !capable(CAP_IPC_LOCK)) {
115 down_read(¤t->mm->mmap_sem);
116 for (got = 0; got < num_pages; got += ret) {
117 ret = get_user_pages_longterm(start_page + got * PAGE_SIZE,
119 FOLL_WRITE | FOLL_FORCE,
122 up_read(¤t->mm->mmap_sem);
126 up_read(¤t->mm->mmap_sem);
130 __qib_release_user_pages(p, got, 0);
132 atomic64_sub(num_pages, ¤t->mm->pinned_vm);
136 void qib_release_user_pages(struct page **p, size_t num_pages)
138 __qib_release_user_pages(p, num_pages, 1);
140 /* during close after signal, mm can be NULL */
142 atomic64_sub(num_pages, ¤t->mm->pinned_vm);