/*
*
* This file is provided under a dual BSD/GPLv2 license. When using or
* redistributing this file, you may do so under either license.
*
* GPL LICENSE SUMMARY
*
* Copyright(c) 2015 Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* BSD LICENSE
*
* Copyright(c) 2015 Intel Corporation.
*
* 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.
* - Neither the name of Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <linux/mm.h>
#include <linux/device.h>
#include "hfi.h"
static void __hfi1_release_user_pages(struct page **p, size_t num_pages,
int dirty)
{
size_t i;
for (i = 0; i < num_pages; i++) {
if (dirty)
set_page_dirty_lock(p[i]);
put_page(p[i]);
}
}
/*
* Call with current->mm->mmap_sem held.
*/
static int __hfi1_get_user_pages(unsigned long start_page, size_t num_pages,
struct page **p)
{
unsigned long lock_limit;
size_t got;
int ret;
lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
if (num_pages > lock_limit && !capable(CAP_IPC_LOCK)) {
ret = -ENOMEM;
goto bail;
}
for (got = 0; got < num_pages; got += ret) {
ret = get_user_pages(current, current->mm,
start_page + got * PAGE_SIZE,
num_pages - got, 1, 1,
p + got, NULL);
if (ret < 0)
goto bail_release;
}
current->mm->pinned_vm += num_pages;
ret = 0;
goto bail;
bail_release:
__hfi1_release_user_pages(p, got, 0);
bail:
return ret;
}
/**
* hfi1_map_page - a safety wrapper around pci_map_page()
*
*/
dma_addr_t hfi1_map_page(struct pci_dev *hwdev, struct page *page,
unsigned long offset, size_t size, int direction)
{
dma_addr_t phys;
phys = pci_map_page(hwdev, page, offset, size, direction);
return phys;
}
/**
* hfi1_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 hfi1_get_user_pages(unsigned long start_page, size_t num_pages,
struct page **p)
{
int ret;
down_write(¤t->mm->mmap_sem);
ret = __hfi1_get_user_pages(start_page, num_pages, p);
up_write(¤t->mm->mmap_sem);
return ret;
}
void hfi1_release_user_pages(struct page **p, size_t num_pages)
{
if (current->mm) /* during close after signal, mm can be NULL */
down_write(¤t->mm->mmap_sem);
__hfi1_release_user_pages(p, num_pages, 1);
if (current->mm) {
current->mm->pinned_vm -= num_pages;
up_write(¤t->mm->mmap_sem);
}
}
