157 lines
4.5 KiB
C
157 lines
4.5 KiB
C
/*
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*
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* This file is provided under a dual BSD/GPLv2 license. When using or
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* redistributing this file, you may do so under either license.
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*
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* GPL LICENSE SUMMARY
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*
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* Copyright(c) 2015 Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* BSD LICENSE
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*
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* Copyright(c) 2015 Intel Corporation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* - Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include <linux/mm.h>
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#include <linux/device.h>
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#include "hfi.h"
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static void __hfi1_release_user_pages(struct page **p, size_t num_pages,
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int dirty)
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{
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size_t i;
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for (i = 0; i < num_pages; i++) {
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if (dirty)
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set_page_dirty_lock(p[i]);
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put_page(p[i]);
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}
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}
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/*
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* Call with current->mm->mmap_sem held.
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*/
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static int __hfi1_get_user_pages(unsigned long start_page, size_t num_pages,
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struct page **p)
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{
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unsigned long lock_limit;
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size_t got;
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int ret;
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lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
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if (num_pages > lock_limit && !capable(CAP_IPC_LOCK)) {
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ret = -ENOMEM;
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goto bail;
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}
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for (got = 0; got < num_pages; got += ret) {
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ret = get_user_pages(current, current->mm,
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start_page + got * PAGE_SIZE,
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num_pages - got, 1, 1,
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p + got, NULL);
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if (ret < 0)
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goto bail_release;
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}
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current->mm->pinned_vm += num_pages;
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ret = 0;
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goto bail;
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bail_release:
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__hfi1_release_user_pages(p, got, 0);
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bail:
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return ret;
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}
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/**
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* hfi1_map_page - a safety wrapper around pci_map_page()
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*
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*/
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dma_addr_t hfi1_map_page(struct pci_dev *hwdev, struct page *page,
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unsigned long offset, size_t size, int direction)
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{
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dma_addr_t phys;
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phys = pci_map_page(hwdev, page, offset, size, direction);
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return phys;
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}
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/**
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* hfi1_get_user_pages - lock user pages into memory
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* @start_page: the start page
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* @num_pages: the number of pages
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* @p: the output page structures
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*
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* This function takes a given start page (page aligned user virtual
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* address) and pins it and the following specified number of pages. For
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* now, num_pages is always 1, but that will probably change at some point
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* (because caller is doing expected sends on a single virtually contiguous
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* buffer, so we can do all pages at once).
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*/
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int hfi1_get_user_pages(unsigned long start_page, size_t num_pages,
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struct page **p)
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{
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int ret;
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down_write(¤t->mm->mmap_sem);
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ret = __hfi1_get_user_pages(start_page, num_pages, p);
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up_write(¤t->mm->mmap_sem);
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return ret;
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}
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void hfi1_release_user_pages(struct page **p, size_t num_pages)
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{
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if (current->mm) /* during close after signal, mm can be NULL */
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down_write(¤t->mm->mmap_sem);
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__hfi1_release_user_pages(p, num_pages, 1);
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if (current->mm) {
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current->mm->pinned_vm -= num_pages;
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up_write(¤t->mm->mmap_sem);
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}
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}
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