122 lines
3.6 KiB
C
122 lines
3.6 KiB
C
/*
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* Copyright (c) 2006 QLogic, 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/module.h>
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#include <linux/vmalloc.h>
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#include <linux/mm.h>
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#include <linux/errno.h>
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#include <asm/pgtable.h>
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#include "ipath_verbs.h"
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/**
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* ipath_release_mmap_info - free mmap info structure
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* @ref: a pointer to the kref within struct ipath_mmap_info
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*/
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void ipath_release_mmap_info(struct kref *ref)
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{
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struct ipath_mmap_info *ip =
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container_of(ref, struct ipath_mmap_info, ref);
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vfree(ip->obj);
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kfree(ip);
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}
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/*
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* open and close keep track of how many times the CQ is mapped,
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* to avoid releasing it.
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*/
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static void ipath_vma_open(struct vm_area_struct *vma)
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{
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struct ipath_mmap_info *ip = vma->vm_private_data;
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kref_get(&ip->ref);
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ip->mmap_cnt++;
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}
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static void ipath_vma_close(struct vm_area_struct *vma)
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{
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struct ipath_mmap_info *ip = vma->vm_private_data;
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ip->mmap_cnt--;
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kref_put(&ip->ref, ipath_release_mmap_info);
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}
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static struct vm_operations_struct ipath_vm_ops = {
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.open = ipath_vma_open,
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.close = ipath_vma_close,
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};
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/**
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* ipath_mmap - create a new mmap region
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* @context: the IB user context of the process making the mmap() call
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* @vma: the VMA to be initialized
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* Return zero if the mmap is OK. Otherwise, return an errno.
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*/
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int ipath_mmap(struct ib_ucontext *context, struct vm_area_struct *vma)
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{
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struct ipath_ibdev *dev = to_idev(context->device);
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unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
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unsigned long size = vma->vm_end - vma->vm_start;
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struct ipath_mmap_info *ip, **pp;
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int ret = -EINVAL;
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/*
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* Search the device's list of objects waiting for a mmap call.
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* Normally, this list is very short since a call to create a
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* CQ, QP, or SRQ is soon followed by a call to mmap().
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*/
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spin_lock_irq(&dev->pending_lock);
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for (pp = &dev->pending_mmaps; (ip = *pp); pp = &ip->next) {
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/* Only the creator is allowed to mmap the object */
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if (context != ip->context || (void *) offset != ip->obj)
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continue;
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/* Don't allow a mmap larger than the object. */
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if (size > ip->size)
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break;
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*pp = ip->next;
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spin_unlock_irq(&dev->pending_lock);
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ret = remap_vmalloc_range(vma, ip->obj, 0);
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if (ret)
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goto done;
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vma->vm_ops = &ipath_vm_ops;
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vma->vm_private_data = ip;
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ipath_vma_open(vma);
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goto done;
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}
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spin_unlock_irq(&dev->pending_lock);
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done:
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return ret;
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}
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