diff options
Diffstat (limited to 'drivers/infiniband/hw/qib/qib_user_pages.c')
| -rw-r--r-- | drivers/infiniband/hw/qib/qib_user_pages.c | 137 |
1 files changed, 0 insertions, 137 deletions
diff --git a/drivers/infiniband/hw/qib/qib_user_pages.c b/drivers/infiniband/hw/qib/qib_user_pages.c deleted file mode 100644 index 1bb7507325bc..000000000000 --- a/drivers/infiniband/hw/qib/qib_user_pages.c +++ /dev/null @@ -1,137 +0,0 @@ -/* - * Copyright (c) 2006, 2007, 2008, 2009 QLogic Corporation. All rights reserved. - * Copyright (c) 2003, 2004, 2005, 2006 PathScale, Inc. All rights reserved. - * - * This software is available to you under a choice of one of two - * licenses. You may choose to be licensed under the terms of the GNU - * General Public License (GPL) Version 2, available from the file - * COPYING in the main directory of this source tree, or the - * OpenIB.org BSD license below: - * - * Redistribution and use in source and binary forms, with or - * without modification, are permitted provided that the following - * conditions are met: - * - * - Redistributions of source code must retain the above - * copyright notice, this list of conditions and the following - * disclaimer. - * - * - Redistributions in binary form must reproduce the above - * copyright notice, this list of conditions and the following - * disclaimer in the documentation and/or other materials - * provided with the distribution. - * - * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, - * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF - * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND - * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS - * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN - * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN - * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE - * SOFTWARE. - */ - -#include <linux/mm.h> -#include <linux/sched/signal.h> -#include <linux/device.h> - -#include "qib.h" - -static void __qib_release_user_pages(struct page **p, size_t num_pages, - int dirty) -{ - unpin_user_pages_dirty_lock(p, num_pages, dirty); -} - -/* - * qib_map_page - a safety wrapper around pci_map_page() - * - * A dma_addr of all 0's is interpreted by the chip as "disabled". - * Unfortunately, it can also be a valid dma_addr returned on some - * architectures. - * - * The powerpc iommu assigns dma_addrs in ascending order, so we don't - * have to bother with retries or mapping a dummy page to insure we - * don't just get the same mapping again. - * - * I'm sure we won't be so lucky with other iommu's, so FIXME. - */ -int qib_map_page(struct pci_dev *hwdev, struct page *page, dma_addr_t *daddr) -{ - dma_addr_t phys; - - phys = dma_map_page(&hwdev->dev, page, 0, PAGE_SIZE, DMA_FROM_DEVICE); - if (dma_mapping_error(&hwdev->dev, phys)) - return -ENOMEM; - - if (!phys) { - dma_unmap_page(&hwdev->dev, phys, PAGE_SIZE, DMA_FROM_DEVICE); - phys = dma_map_page(&hwdev->dev, page, 0, PAGE_SIZE, - DMA_FROM_DEVICE); - if (dma_mapping_error(&hwdev->dev, phys)) - return -ENOMEM; - /* - * FIXME: If we get 0 again, we should keep this page, - * map another, then free the 0 page. - */ - } - *daddr = phys; - return 0; -} - -/** - * qib_get_user_pages - lock user pages into memory - * @start_page: the start page - * @num_pages: the number of pages - * @p: the output page structures - * - * This function takes a given start page (page aligned user virtual - * address) and pins it and the following specified number of pages. For - * now, num_pages is always 1, but that will probably change at some point - * (because caller is doing expected sends on a single virtually contiguous - * buffer, so we can do all pages at once). - */ -int qib_get_user_pages(unsigned long start_page, size_t num_pages, - struct page **p) -{ - unsigned long locked, lock_limit; - size_t got; - int ret; - - lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; - locked = atomic64_add_return(num_pages, ¤t->mm->pinned_vm); - - if (locked > lock_limit && !capable(CAP_IPC_LOCK)) { - ret = -ENOMEM; - goto bail; - } - - mmap_read_lock(current->mm); - for (got = 0; got < num_pages; got += ret) { - ret = pin_user_pages(start_page + got * PAGE_SIZE, - num_pages - got, - FOLL_LONGTERM | FOLL_WRITE, - p + got); - if (ret < 0) { - mmap_read_unlock(current->mm); - goto bail_release; - } - } - mmap_read_unlock(current->mm); - - return 0; -bail_release: - __qib_release_user_pages(p, got, 0); -bail: - atomic64_sub(num_pages, ¤t->mm->pinned_vm); - return ret; -} - -void qib_release_user_pages(struct page **p, size_t num_pages) -{ - __qib_release_user_pages(p, num_pages, 1); - - /* during close after signal, mm can be NULL */ - if (current->mm) - atomic64_sub(num_pages, ¤t->mm->pinned_vm); -} |