Return to umem.c CVS log

Up to [Development] / linux-2.6-xfs / drivers / infiniband / core

Update 2.6.x-xfs to 2.6.23-rc4.

Also update fs/xfs with external mainline changes.
There were 12 such missing commits that I detected:

--------
commit ad690ef9e690f6c31f7d310b09ef1314bcec9033
Author: Al Viro <viro@ftp.linux.org.uk>
    xfs ioctl __user annotations

commit 20c2df83d25c6a95affe6157a4c9cac4cf5ffaac
Author: Paul Mundt <lethal@linux-sh.org>
    mm: Remove slab destructors from kmem_cache_create().

commit d0217ac04ca6591841e5665f518e38064f4e65bd
Author: Nick Piggin <npiggin@suse.de>
    mm: fault feedback #1

commit 54cb8821de07f2ffcd28c380ce9b93d5784b40d7
Author: Nick Piggin <npiggin@suse.de>
    mm: merge populate and nopage into fault (fixes nonlinear)

commit d00806b183152af6d24f46f0c33f14162ca1262a
Author: Nick Piggin <npiggin@suse.de>
    mm: fix fault vs invalidate race for linear mappings

commit a569425512253992cc64ebf8b6d00a62f986db3e
Author: Christoph Hellwig <hch@infradead.org>
    knfsd: exportfs: add exportfs.h header

commit 831441862956fffa17b9801db37e6ea1650b0f69
Author: Rafael J. Wysocki <rjw@sisk.pl>
    Freezer: make kernel threads nonfreezable by default

commit 8e1f936b73150f5095448a0fee6d4f30a1f9001d
Author: Rusty Russell <rusty@rustcorp.com.au>
    mm: clean up and kernelify shrinker registration

commit 5ffc4ef45b3b0a57872f631b4e4ceb8ace0d7496
Author: Jens Axboe <jens.axboe@oracle.com>
    sendfile: remove .sendfile from filesystems that use generic_file_sendfile()

commit 8bb7844286fb8c9fce6f65d8288aeb09d03a5e0d
Author: Rafael J. Wysocki <rjw@sisk.pl>
    Add suspend-related notifications for CPU hotplug

commit 59c51591a0ac7568824f541f57de967e88adaa07
Author: Michael Opdenacker <michael@free-electrons.com>
    Fix occurrences of "the the "

commit 0ceb331433e8aad9c5f441a965d7c681f8b9046f
Author: Dmitriy Monakhov <dmonakhov@openvz.org>
    mm: move common segment checks to separate helper function
--------
Merge of 2.6.x-xfs-melb:linux:29656b by kenmcd.

/*
 * Copyright (c) 2005 Topspin Communications.  All rights reserved.
 * Copyright (c) 2005 Cisco Systems.  All rights reserved.
 * Copyright (c) 2005 Mellanox Technologies. 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.
 *
 * $Id: umem.c,v 1.4 2007/09/12 17:09:56 tes.longdrop.melbourne.sgi.com Exp $
 */

#include <linux/mm.h>
#include <linux/dma-mapping.h>
#include <linux/sched.h>

#include "uverbs.h"

#define IB_UMEM_MAX_PAGE_CHUNK						\
	((PAGE_SIZE - offsetof(struct ib_umem_chunk, page_list)) /	\
	 ((void *) &((struct ib_umem_chunk *) 0)->page_list[1] -	\
	  (void *) &((struct ib_umem_chunk *) 0)->page_list[0]))

static void __ib_umem_release(struct ib_device *dev, struct ib_umem *umem, int dirty)
{
	struct ib_umem_chunk *chunk, *tmp;
	int i;

	list_for_each_entry_safe(chunk, tmp, &umem->chunk_list, list) {
		ib_dma_unmap_sg(dev, chunk->page_list,
				chunk->nents, DMA_BIDIRECTIONAL);
		for (i = 0; i < chunk->nents; ++i) {
			if (umem->writable && dirty)
				set_page_dirty_lock(chunk->page_list[i].page);
			put_page(chunk->page_list[i].page);
		}

		kfree(chunk);
	}
}

/**
 * ib_umem_get - Pin and DMA map userspace memory.
 * @context: userspace context to pin memory for
 * @addr: userspace virtual address to start at
 * @size: length of region to pin
 * @access: IB_ACCESS_xxx flags for memory being pinned
 */
struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr,
			    size_t size, int access)
{
	struct ib_umem *umem;
	struct page **page_list;
	struct ib_umem_chunk *chunk;
	unsigned long locked;
	unsigned long lock_limit;
	unsigned long cur_base;
	unsigned long npages;
	int ret;
	int off;
	int i;

	if (!can_do_mlock())
		return ERR_PTR(-EPERM);

	umem = kmalloc(sizeof *umem, GFP_KERNEL);
	if (!umem)
		return ERR_PTR(-ENOMEM);

	umem->context   = context;
	umem->length    = size;
	umem->offset    = addr & ~PAGE_MASK;
	umem->page_size = PAGE_SIZE;
	/*
	 * We ask for writable memory if any access flags other than
	 * "remote read" are set.  "Local write" and "remote write"
	 * obviously require write access.  "Remote atomic" can do
	 * things like fetch and add, which will modify memory, and
	 * "MW bind" can change permissions by binding a window.
	 */
	umem->writable  = !!(access & ~IB_ACCESS_REMOTE_READ);

	INIT_LIST_HEAD(&umem->chunk_list);

	page_list = (struct page **) __get_free_page(GFP_KERNEL);
	if (!page_list) {
		kfree(umem);
		return ERR_PTR(-ENOMEM);
	}

	npages = PAGE_ALIGN(size + umem->offset) >> PAGE_SHIFT;

	down_write(&current->mm->mmap_sem);

	locked     = npages + current->mm->locked_vm;
	lock_limit = current->signal->rlim[RLIMIT_MEMLOCK].rlim_cur >> PAGE_SHIFT;

	if ((locked > lock_limit) && !capable(CAP_IPC_LOCK)) {
		ret = -ENOMEM;
		goto out;
	}

	cur_base = addr & PAGE_MASK;

	ret = 0;
	while (npages) {
		ret = get_user_pages(current, current->mm, cur_base,
				     min_t(int, npages,
					   PAGE_SIZE / sizeof (struct page *)),
				     1, !umem->writable, page_list, NULL);

		if (ret < 0)
			goto out;

		cur_base += ret * PAGE_SIZE;
		npages   -= ret;

		off = 0;

		while (ret) {
			chunk = kmalloc(sizeof *chunk + sizeof (struct scatterlist) *
					min_t(int, ret, IB_UMEM_MAX_PAGE_CHUNK),
					GFP_KERNEL);
			if (!chunk) {
				ret = -ENOMEM;
				goto out;
			}

			chunk->nents = min_t(int, ret, IB_UMEM_MAX_PAGE_CHUNK);
			for (i = 0; i < chunk->nents; ++i) {
				chunk->page_list[i].page   = page_list[i + off];
				chunk->page_list[i].offset = 0;
				chunk->page_list[i].length = PAGE_SIZE;
			}

			chunk->nmap = ib_dma_map_sg(context->device,
						    &chunk->page_list[0],
						    chunk->nents,
						    DMA_BIDIRECTIONAL);
			if (chunk->nmap <= 0) {
				for (i = 0; i < chunk->nents; ++i)
					put_page(chunk->page_list[i].page);
				kfree(chunk);

				ret = -ENOMEM;
				goto out;
			}

			ret -= chunk->nents;
			off += chunk->nents;
			list_add_tail(&chunk->list, &umem->chunk_list);
		}

		ret = 0;
	}

out:
	if (ret < 0) {
		__ib_umem_release(context->device, umem, 0);
		kfree(umem);
	} else
		current->mm->locked_vm = locked;

	up_write(&current->mm->mmap_sem);
	free_page((unsigned long) page_list);

	return ret < 0 ? ERR_PTR(ret) : umem;
}
EXPORT_SYMBOL(ib_umem_get);

static void ib_umem_account(struct work_struct *work)
{
	struct ib_umem *umem = container_of(work, struct ib_umem, work);

	down_write(&umem->mm->mmap_sem);
	umem->mm->locked_vm -= umem->diff;
	up_write(&umem->mm->mmap_sem);
	mmput(umem->mm);
	kfree(umem);
}

/**
 * ib_umem_release - release memory pinned with ib_umem_get
 * @umem: umem struct to release
 */
void ib_umem_release(struct ib_umem *umem)
{
	struct ib_ucontext *context = umem->context;
	struct mm_struct *mm;
	unsigned long diff;

	__ib_umem_release(umem->context->device, umem, 1);

	mm = get_task_mm(current);
	if (!mm) {
		kfree(umem);
		return;
	}

	diff = PAGE_ALIGN(umem->length + umem->offset) >> PAGE_SHIFT;

	/*
	 * We may be called with the mm's mmap_sem already held.  This
	 * can happen when a userspace munmap() is the call that drops
	 * the last reference to our file and calls our release
	 * method.  If there are memory regions to destroy, we'll end
	 * up here and not be able to take the mmap_sem.  In that case
	 * we defer the vm_locked accounting to the system workqueue.
	 */
	if (context->closing) {
		if (!down_write_trylock(&mm->mmap_sem)) {
			INIT_WORK(&umem->work, ib_umem_account);
			umem->mm   = mm;
			umem->diff = diff;

			schedule_work(&umem->work);
			return;
		}
	} else
		down_write(&mm->mmap_sem);

	current->mm->locked_vm -= diff;
	up_write(&mm->mmap_sem);
	mmput(mm);
	kfree(umem);
}
EXPORT_SYMBOL(ib_umem_release);

int ib_umem_page_count(struct ib_umem *umem)
{
	struct ib_umem_chunk *chunk;
	int shift;
	int i;
	int n;

	shift = ilog2(umem->page_size);

	n = 0;
	list_for_each_entry(chunk, &umem->chunk_list, list)
		for (i = 0; i < chunk->nmap; ++i)
			n += sg_dma_len(&chunk->page_list[i]) >> shift;

	return n;
}
EXPORT_SYMBOL(ib_umem_page_count);