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/*
* 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)
{
size_t i;
for (i = 0; i < num_pages; i++) {
if (dirty)
set_page_dirty_lock(p[i]);
put_page(p[i]);
}
}
/**
* 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;
}
down_read(¤t->mm->mmap_sem);
for (got = 0; got < num_pages; got += ret) {
ret = get_user_pages_longterm(start_page + got * PAGE_SIZE,
num_pages - got,
FOLL_WRITE | FOLL_FORCE,
p + got, NULL);
if (ret < 0) {
up_read(¤t->mm->mmap_sem);
goto bail_release;
}
}
up_read(¤t->mm->mmap_sem);
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);
}
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