/*
|
* 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 = pci_map_page(hwdev, page, 0, PAGE_SIZE, PCI_DMA_FROMDEVICE);
|
if (pci_dma_mapping_error(hwdev, phys))
|
return -ENOMEM;
|
|
if (!phys) {
|
pci_unmap_page(hwdev, phys, PAGE_SIZE, PCI_DMA_FROMDEVICE);
|
phys = pci_map_page(hwdev, page, 0, PAGE_SIZE,
|
PCI_DMA_FROMDEVICE);
|
if (pci_dma_mapping_error(hwdev, 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 | FOLL_FORCE,
|
p + got, NULL);
|
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);
|
}
|
