diff options
Diffstat (limited to 'drivers/infiniband/core/uverbs_mem.c')
| -rw-r--r-- | drivers/infiniband/core/uverbs_mem.c | 222 |
1 files changed, 0 insertions, 222 deletions
diff --git a/drivers/infiniband/core/uverbs_mem.c b/drivers/infiniband/core/uverbs_mem.c deleted file mode 100644 index 36a32c31566..00000000000 --- a/drivers/infiniband/core/uverbs_mem.c +++ /dev/null @@ -1,222 +0,0 @@ -/* - * 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: uverbs_mem.c 2743 2005-06-28 22:27:59Z roland $ - */ - -#include <linux/mm.h> -#include <linux/dma-mapping.h> - -#include "uverbs.h" - -struct ib_umem_account_work { - struct work_struct work; - struct mm_struct *mm; - unsigned long diff; -}; - - -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) { - dma_unmap_sg(dev->dma_device, 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); - } -} - -int ib_umem_get(struct ib_device *dev, struct ib_umem *mem, - void *addr, size_t size, int write) -{ - 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 = 0; - int off; - int i; - - if (!can_do_mlock()) - return -EPERM; - - page_list = (struct page **) __get_free_page(GFP_KERNEL); - if (!page_list) - return -ENOMEM; - - mem->user_base = (unsigned long) addr; - mem->length = size; - mem->offset = (unsigned long) addr & ~PAGE_MASK; - mem->page_size = PAGE_SIZE; - mem->writable = write; - - INIT_LIST_HEAD(&mem->chunk_list); - - npages = PAGE_ALIGN(size + mem->offset) >> PAGE_SHIFT; - - down_write(¤t->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 = (unsigned long) addr & PAGE_MASK; - - while (npages) { - ret = get_user_pages(current, current->mm, cur_base, - min_t(int, npages, - PAGE_SIZE / sizeof (struct page *)), - 1, !write, 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 = dma_map_sg(dev->dma_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, &mem->chunk_list); - } - - ret = 0; - } - -out: - if (ret < 0) - __ib_umem_release(dev, mem, 0); - else - current->mm->locked_vm = locked; - - up_write(¤t->mm->mmap_sem); - free_page((unsigned long) page_list); - - return ret; -} - -void ib_umem_release(struct ib_device *dev, struct ib_umem *umem) -{ - __ib_umem_release(dev, umem, 1); - - down_write(¤t->mm->mmap_sem); - current->mm->locked_vm -= - PAGE_ALIGN(umem->length + umem->offset) >> PAGE_SHIFT; - up_write(¤t->mm->mmap_sem); -} - -static void ib_umem_account(void *work_ptr) -{ - struct ib_umem_account_work *work = work_ptr; - - down_write(&work->mm->mmap_sem); - work->mm->locked_vm -= work->diff; - up_write(&work->mm->mmap_sem); - mmput(work->mm); - kfree(work); -} - -void ib_umem_release_on_close(struct ib_device *dev, struct ib_umem *umem) -{ - struct ib_umem_account_work *work; - struct mm_struct *mm; - - __ib_umem_release(dev, umem, 1); - - mm = get_task_mm(current); - if (!mm) - return; - - /* - * 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. Therefore we - * defer the vm_locked accounting to the system workqueue. - */ - - work = kmalloc(sizeof *work, GFP_KERNEL); - if (!work) - return; - - INIT_WORK(&work->work, ib_umem_account, work); - work->mm = mm; - work->diff = PAGE_ALIGN(umem->length + umem->offset) >> PAGE_SHIFT; - - schedule_work(&work->work); -} |