forked from Minki/linux
255 lines
6.7 KiB
C
255 lines
6.7 KiB
C
/*
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* Copyright (c) 2006 QLogic, Inc. All rights reserved.
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* Copyright (c) 2003, 2004, 2005, 2006 PathScale, Inc. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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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 "ipath_kernel.h"
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static void __ipath_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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ipath_cdbg(MM, "%lu/%lu put_page %p\n", (unsigned long) i,
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(unsigned long) num_pages, p[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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/* call with current->mm->mmap_sem held */
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static int __get_user_pages(unsigned long start_page, size_t num_pages,
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struct page **p, struct vm_area_struct **vma)
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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 = current->signal->rlim[RLIMIT_MEMLOCK].rlim_cur >>
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PAGE_SHIFT;
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if (num_pages > lock_limit) {
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ret = -ENOMEM;
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goto bail;
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}
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ipath_cdbg(VERBOSE, "pin %lx pages from vaddr %lx\n",
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(unsigned long) num_pages, start_page);
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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, vma);
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if (ret < 0)
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goto bail_release;
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}
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current->mm->locked_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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__ipath_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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* ipath_map_page - a safety wrapper around pci_map_page()
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*
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* A dma_addr of all 0's is interpreted by the chip as "disabled".
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* Unfortunately, it can also be a valid dma_addr returned on some
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* architectures.
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*
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* The powerpc iommu assigns dma_addrs in ascending order, so we don't
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* have to bother with retries or mapping a dummy page to insure we
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* don't just get the same mapping again.
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*
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* I'm sure we won't be so lucky with other iommu's, so FIXME.
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*/
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dma_addr_t ipath_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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if (phys == 0) {
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pci_unmap_page(hwdev, phys, size, direction);
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phys = pci_map_page(hwdev, page, offset, size, direction);
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/*
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* FIXME: If we get 0 again, we should keep this page,
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* map another, then free the 0 page.
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*/
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}
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return phys;
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}
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/**
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* ipath_map_single - a safety wrapper around pci_map_single()
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*
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* Same idea as ipath_map_page().
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*/
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dma_addr_t ipath_map_single(struct pci_dev *hwdev, void *ptr, size_t size,
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int direction)
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{
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dma_addr_t phys;
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phys = pci_map_single(hwdev, ptr, size, direction);
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if (phys == 0) {
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pci_unmap_single(hwdev, phys, size, direction);
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phys = pci_map_single(hwdev, ptr, size, direction);
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/*
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* FIXME: If we get 0 again, we should keep this page,
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* map another, then free the 0 page.
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*/
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}
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return phys;
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}
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/**
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* ipath_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 ipath_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 = __get_user_pages(start_page, num_pages, p, NULL);
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up_write(¤t->mm->mmap_sem);
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return ret;
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}
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/**
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* ipath_get_user_pages_nocopy - lock a single page for I/O and mark shared
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* @start_page: the page to lock
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* @p: the output page structure
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*
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* This is similar to ipath_get_user_pages, but it's always one page, and we
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* mark the page as locked for I/O, and shared. This is used for the user
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* process page that contains the destination address for the rcvhdrq tail
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* update, so we need to have the vma. If we don't do this, the page can be
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* taken away from us on fork, even if the child never touches it, and then
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* the user process never sees the tail register updates.
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*/
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int ipath_get_user_pages_nocopy(unsigned long page, struct page **p)
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{
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struct vm_area_struct *vma;
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int ret;
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down_write(¤t->mm->mmap_sem);
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ret = __get_user_pages(page, 1, p, &vma);
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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 ipath_release_user_pages(struct page **p, size_t num_pages)
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{
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down_write(¤t->mm->mmap_sem);
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__ipath_release_user_pages(p, num_pages, 1);
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current->mm->locked_vm -= num_pages;
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up_write(¤t->mm->mmap_sem);
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}
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struct ipath_user_pages_work {
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struct work_struct work;
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struct mm_struct *mm;
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unsigned long num_pages;
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};
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static void user_pages_account(struct work_struct *_work)
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{
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struct ipath_user_pages_work *work =
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container_of(_work, struct ipath_user_pages_work, work);
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down_write(&work->mm->mmap_sem);
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work->mm->locked_vm -= work->num_pages;
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up_write(&work->mm->mmap_sem);
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mmput(work->mm);
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kfree(work);
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}
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void ipath_release_user_pages_on_close(struct page **p, size_t num_pages)
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{
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struct ipath_user_pages_work *work;
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struct mm_struct *mm;
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__ipath_release_user_pages(p, num_pages, 1);
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mm = get_task_mm(current);
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if (!mm)
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goto bail;
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work = kmalloc(sizeof(*work), GFP_KERNEL);
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if (!work)
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goto bail_mm;
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goto bail;
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INIT_WORK(&work->work, user_pages_account);
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work->mm = mm;
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work->num_pages = num_pages;
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bail_mm:
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mmput(mm);
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bail:
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return;
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}
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