533 lines
14 KiB
C
533 lines
14 KiB
C
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/*
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* Copyright (c) 2005 Topspin Communications. All rights reserved.
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* Copyright (c) 2005 Cisco Systems. All rights reserved.
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* Copyright (c) 2005 Mellanox Technologies. 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/dma-mapping.h>
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#include <linux/sched.h>
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#ifdef __linux__
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#include <linux/hugetlb.h>
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#endif
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#include <linux/dma-attrs.h>
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#include <sys/priv.h>
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#include <sys/resource.h>
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#include <sys/resourcevar.h>
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#include <vm/vm.h>
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#include <vm/vm_map.h>
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#include <vm/vm_object.h>
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#include <vm/vm_pageout.h>
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#include "uverbs.h"
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static int allow_weak_ordering;
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module_param(allow_weak_ordering, bool, 0444);
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MODULE_PARM_DESC(allow_weak_ordering, "Allow weak ordering for data registered memory");
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#define IB_UMEM_MAX_PAGE_CHUNK \
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((PAGE_SIZE - offsetof(struct ib_umem_chunk, page_list)) / \
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((void *) &((struct ib_umem_chunk *) 0)->page_list[1] - \
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(void *) &((struct ib_umem_chunk *) 0)->page_list[0]))
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#ifdef __ia64__
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extern int dma_map_sg_hp_wa;
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static int dma_map_sg_ia64(struct ib_device *ibdev,
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struct scatterlist *sg,
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int nents,
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enum dma_data_direction dir)
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{
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int i, rc, j, lents = 0;
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struct device *dev;
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if (!dma_map_sg_hp_wa)
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return ib_dma_map_sg(ibdev, sg, nents, dir);
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dev = ibdev->dma_device;
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for (i = 0; i < nents; ++i) {
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rc = dma_map_sg(dev, sg + i, 1, dir);
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if (rc <= 0) {
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for (j = 0; j < i; ++j)
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dma_unmap_sg(dev, sg + j, 1, dir);
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return 0;
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}
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lents += rc;
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}
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return lents;
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}
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static void dma_unmap_sg_ia64(struct ib_device *ibdev,
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struct scatterlist *sg,
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int nents,
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enum dma_data_direction dir)
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{
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int i;
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struct device *dev;
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if (!dma_map_sg_hp_wa)
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return ib_dma_unmap_sg(ibdev, sg, nents, dir);
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dev = ibdev->dma_device;
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for (i = 0; i < nents; ++i)
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dma_unmap_sg(dev, sg + i, 1, dir);
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}
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#define ib_dma_map_sg(dev, sg, nents, dir) dma_map_sg_ia64(dev, sg, nents, dir)
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#define ib_dma_unmap_sg(dev, sg, nents, dir) dma_unmap_sg_ia64(dev, sg, nents, dir)
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#endif
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static void __ib_umem_release(struct ib_device *dev, struct ib_umem *umem, int dirty)
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{
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#ifdef __linux__
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struct ib_umem_chunk *chunk, *tmp;
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int i;
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list_for_each_entry_safe(chunk, tmp, &umem->chunk_list, list) {
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ib_dma_unmap_sg_attrs(dev, chunk->page_list,
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chunk->nents, DMA_BIDIRECTIONAL, &chunk->attrs);
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for (i = 0; i < chunk->nents; ++i) {
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struct page *page = sg_page(&chunk->page_list[i]);
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if (umem->writable && dirty)
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set_page_dirty_lock(page);
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put_page(page);
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}
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kfree(chunk);
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}
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#else
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struct ib_umem_chunk *chunk, *tmp;
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vm_object_t object;
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int i;
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object = NULL;
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list_for_each_entry_safe(chunk, tmp, &umem->chunk_list, list) {
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ib_dma_unmap_sg_attrs(dev, chunk->page_list,
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chunk->nents, DMA_BIDIRECTIONAL, &chunk->attrs);
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for (i = 0; i < chunk->nents; ++i) {
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struct page *page = sg_page(&chunk->page_list[i]);
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if (umem->writable && dirty) {
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if (object && object != page->object)
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VM_OBJECT_UNLOCK(object);
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if (object != page->object) {
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object = page->object;
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VM_OBJECT_LOCK(object);
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}
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vm_page_dirty(page);
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}
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}
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kfree(chunk);
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}
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if (object)
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VM_OBJECT_UNLOCK(object);
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#endif
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}
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/**
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* ib_umem_get - Pin and DMA map userspace memory.
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* @context: userspace context to pin memory for
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* @addr: userspace virtual address to start at
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* @size: length of region to pin
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* @access: IB_ACCESS_xxx flags for memory being pinned
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* @dmasync: flush in-flight DMA when the memory region is written
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*/
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struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr,
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size_t size, int access, int dmasync)
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{
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#ifdef __linux__
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struct ib_umem *umem;
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struct page **page_list;
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struct vm_area_struct **vma_list;
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struct ib_umem_chunk *chunk;
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unsigned long locked;
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unsigned long lock_limit;
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unsigned long cur_base;
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unsigned long npages;
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int ret;
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int off;
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int i;
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DEFINE_DMA_ATTRS(attrs);
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if (dmasync)
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dma_set_attr(DMA_ATTR_WRITE_BARRIER, &attrs);
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else if (allow_weak_ordering)
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dma_set_attr(DMA_ATTR_WEAK_ORDERING, &attrs);
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if (!can_do_mlock())
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return ERR_PTR(-EPERM);
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umem = kmalloc(sizeof *umem, GFP_KERNEL);
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if (!umem)
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return ERR_PTR(-ENOMEM);
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umem->context = context;
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umem->length = size;
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umem->offset = addr & ~PAGE_MASK;
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umem->page_size = PAGE_SIZE;
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/*
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* We ask for writable memory if any access flags other than
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* "remote read" are set. "Local write" and "remote write"
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* obviously require write access. "Remote atomic" can do
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* things like fetch and add, which will modify memory, and
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* "MW bind" can change permissions by binding a window.
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*/
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umem->writable = !!(access & ~IB_ACCESS_REMOTE_READ);
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/* We assume the memory is from hugetlb until proved otherwise */
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umem->hugetlb = 1;
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INIT_LIST_HEAD(&umem->chunk_list);
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page_list = (struct page **) __get_free_page(GFP_KERNEL);
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if (!page_list) {
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kfree(umem);
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return ERR_PTR(-ENOMEM);
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}
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/*
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* if we can't alloc the vma_list, it's not so bad;
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* just assume the memory is not hugetlb memory
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*/
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vma_list = (struct vm_area_struct **) __get_free_page(GFP_KERNEL);
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if (!vma_list)
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umem->hugetlb = 0;
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npages = PAGE_ALIGN(size + umem->offset) >> PAGE_SHIFT;
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down_write(¤t->mm->mmap_sem);
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locked = npages + current->mm->locked_vm;
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lock_limit = current->signal->rlim[RLIMIT_MEMLOCK].rlim_cur >> PAGE_SHIFT;
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if ((locked > lock_limit) && !capable(CAP_IPC_LOCK)) {
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ret = -ENOMEM;
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goto out;
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}
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cur_base = addr & PAGE_MASK;
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ret = 0;
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while (npages) {
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ret = get_user_pages(current, current->mm, cur_base,
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min_t(unsigned long, npages,
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PAGE_SIZE / sizeof (struct page *)),
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1, !umem->writable, page_list, vma_list);
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if (ret < 0)
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goto out;
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cur_base += ret * PAGE_SIZE;
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npages -= ret;
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off = 0;
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while (ret) {
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chunk = kmalloc(sizeof *chunk + sizeof (struct scatterlist) *
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min_t(int, ret, IB_UMEM_MAX_PAGE_CHUNK),
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GFP_KERNEL);
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if (!chunk) {
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ret = -ENOMEM;
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goto out;
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}
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chunk->attrs = attrs;
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chunk->nents = min_t(int, ret, IB_UMEM_MAX_PAGE_CHUNK);
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sg_init_table(chunk->page_list, chunk->nents);
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for (i = 0; i < chunk->nents; ++i) {
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if (vma_list &&
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!is_vm_hugetlb_page(vma_list[i + off]))
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umem->hugetlb = 0;
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sg_set_page(&chunk->page_list[i], page_list[i + off], PAGE_SIZE, 0);
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}
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chunk->nmap = ib_dma_map_sg_attrs(context->device,
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&chunk->page_list[0],
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chunk->nents,
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DMA_BIDIRECTIONAL,
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&attrs);
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if (chunk->nmap <= 0) {
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for (i = 0; i < chunk->nents; ++i)
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put_page(sg_page(&chunk->page_list[i]));
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kfree(chunk);
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ret = -ENOMEM;
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goto out;
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}
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ret -= chunk->nents;
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off += chunk->nents;
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list_add_tail(&chunk->list, &umem->chunk_list);
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}
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ret = 0;
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}
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out:
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if (ret < 0) {
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__ib_umem_release(context->device, umem, 0);
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kfree(umem);
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} else
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current->mm->locked_vm = locked;
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up_write(¤t->mm->mmap_sem);
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if (vma_list)
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free_page((unsigned long) vma_list);
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free_page((unsigned long) page_list);
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return ret < 0 ? ERR_PTR(ret) : umem;
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#else
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struct ib_umem *umem;
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struct ib_umem_chunk *chunk;
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struct proc *proc;
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pmap_t pmap;
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vm_offset_t end, last, start;
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vm_size_t npages;
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int error;
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int ents;
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int ret;
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int i;
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DEFINE_DMA_ATTRS(attrs);
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error = priv_check(curthread, PRIV_VM_MLOCK);
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if (error)
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return ERR_PTR(-error);
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last = addr + size;
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start = addr & PAGE_MASK; /* Use the linux PAGE_MASK definition. */
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end = roundup2(last, PAGE_SIZE); /* Use PAGE_MASK safe operation. */
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if (last < addr || end < addr)
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return ERR_PTR(-EINVAL);
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npages = atop(end - start);
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if (npages > vm_page_max_wired)
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return ERR_PTR(-ENOMEM);
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umem = kzalloc(sizeof *umem, GFP_KERNEL);
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if (!umem)
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return ERR_PTR(-ENOMEM);
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proc = curthread->td_proc;
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PROC_LOCK(proc);
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if (ptoa(npages +
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pmap_wired_count(vm_map_pmap(&proc->p_vmspace->vm_map))) >
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lim_cur(proc, RLIMIT_MEMLOCK)) {
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PROC_UNLOCK(proc);
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kfree(umem);
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return ERR_PTR(-ENOMEM);
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}
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PROC_UNLOCK(proc);
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if (npages + cnt.v_wire_count > vm_page_max_wired) {
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kfree(umem);
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return ERR_PTR(-EAGAIN);
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}
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error = vm_map_wire(&proc->p_vmspace->vm_map, start, end,
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VM_MAP_WIRE_USER | VM_MAP_WIRE_NOHOLES |
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(umem->writable ? VM_MAP_WIRE_WRITE : 0));
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if (error != KERN_SUCCESS) {
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kfree(umem);
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return ERR_PTR(-ENOMEM);
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}
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umem->context = context;
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umem->length = size;
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umem->offset = addr & ~PAGE_MASK;
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umem->page_size = PAGE_SIZE;
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umem->start = addr;
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/*
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||
|
|
* We ask for writable memory if any access flags other than
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||
|
|
* "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);
|
||
|
|
umem->hugetlb = 0;
|
||
|
|
INIT_LIST_HEAD(&umem->chunk_list);
|
||
|
|
|
||
|
|
pmap = vm_map_pmap(&proc->p_vmspace->vm_map);
|
||
|
|
ret = 0;
|
||
|
|
while (npages) {
|
||
|
|
ents = min_t(int, npages, IB_UMEM_MAX_PAGE_CHUNK);
|
||
|
|
chunk = kmalloc(sizeof(*chunk) +
|
||
|
|
(sizeof(struct scatterlist) * ents),
|
||
|
|
GFP_KERNEL);
|
||
|
|
if (!chunk) {
|
||
|
|
ret = -ENOMEM;
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
chunk->attrs = attrs;
|
||
|
|
chunk->nents = ents;
|
||
|
|
sg_init_table(&chunk->page_list[0], ents);
|
||
|
|
for (i = 0; i < chunk->nents; ++i) {
|
||
|
|
vm_paddr_t pa;
|
||
|
|
|
||
|
|
pa = pmap_extract(pmap, start);
|
||
|
|
if (pa == 0) {
|
||
|
|
ret = -ENOMEM;
|
||
|
|
kfree(chunk);
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
sg_set_page(&chunk->page_list[i], PHYS_TO_VM_PAGE(pa),
|
||
|
|
PAGE_SIZE, 0);
|
||
|
|
npages--;
|
||
|
|
start += PAGE_SIZE;
|
||
|
|
}
|
||
|
|
|
||
|
|
chunk->nmap = ib_dma_map_sg_attrs(context->device,
|
||
|
|
&chunk->page_list[0],
|
||
|
|
chunk->nents,
|
||
|
|
DMA_BIDIRECTIONAL,
|
||
|
|
&attrs);
|
||
|
|
if (chunk->nmap != chunk->nents) {
|
||
|
|
kfree(chunk);
|
||
|
|
ret = -ENOMEM;
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
list_add_tail(&chunk->list, &umem->chunk_list);
|
||
|
|
}
|
||
|
|
|
||
|
|
out:
|
||
|
|
if (ret < 0) {
|
||
|
|
__ib_umem_release(context->device, umem, 0);
|
||
|
|
kfree(umem);
|
||
|
|
}
|
||
|
|
|
||
|
|
return ret < 0 ? ERR_PTR(ret) : umem;
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(ib_umem_get);
|
||
|
|
|
||
|
|
#ifdef __linux__
|
||
|
|
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);
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/**
|
||
|
|
* ib_umem_release - release memory pinned with ib_umem_get
|
||
|
|
* @umem: umem struct to release
|
||
|
|
*/
|
||
|
|
void ib_umem_release(struct ib_umem *umem)
|
||
|
|
{
|
||
|
|
#ifdef __linux__
|
||
|
|
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);
|
||
|
|
#else
|
||
|
|
vm_offset_t addr, end, last, start;
|
||
|
|
vm_size_t size;
|
||
|
|
int error;
|
||
|
|
|
||
|
|
__ib_umem_release(umem->context->device, umem, 1);
|
||
|
|
if (umem->context->closing) {
|
||
|
|
kfree(umem);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
error = priv_check(curthread, PRIV_VM_MUNLOCK);
|
||
|
|
if (error)
|
||
|
|
return;
|
||
|
|
addr = umem->start;
|
||
|
|
size = umem->length;
|
||
|
|
last = addr + size;
|
||
|
|
start = addr & PAGE_MASK; /* Use the linux PAGE_MASK definition. */
|
||
|
|
end = roundup2(last, PAGE_SIZE); /* Use PAGE_MASK safe operation. */
|
||
|
|
vm_map_unwire(&curthread->td_proc->p_vmspace->vm_map, start, end,
|
||
|
|
VM_MAP_WIRE_USER | VM_MAP_WIRE_NOHOLES);
|
||
|
|
|
||
|
|
#endif
|
||
|
|
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);
|