+++ /dev/null
-/*
- * Copyright (c) 2006, 2007 QLogic Corporation. 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.
- */
-
-#include <linux/module.h>
-#include <linux/vmalloc.h>
-#include <linux/slab.h>
-#include <linux/mm.h>
-#include <linux/errno.h>
-#include <asm/pgtable.h>
-
-#include "ipath_verbs.h"
-
-/**
- * ipath_release_mmap_info - free mmap info structure
- * @ref: a pointer to the kref within struct ipath_mmap_info
- */
-void ipath_release_mmap_info(struct kref *ref)
-{
- struct ipath_mmap_info *ip =
- container_of(ref, struct ipath_mmap_info, ref);
- struct ipath_ibdev *dev = to_idev(ip->context->device);
-
- spin_lock_irq(&dev->pending_lock);
- list_del(&ip->pending_mmaps);
- spin_unlock_irq(&dev->pending_lock);
-
- vfree(ip->obj);
- kfree(ip);
-}
-
-/*
- * open and close keep track of how many times the CQ is mapped,
- * to avoid releasing it.
- */
-static void ipath_vma_open(struct vm_area_struct *vma)
-{
- struct ipath_mmap_info *ip = vma->vm_private_data;
-
- kref_get(&ip->ref);
-}
-
-static void ipath_vma_close(struct vm_area_struct *vma)
-{
- struct ipath_mmap_info *ip = vma->vm_private_data;
-
- kref_put(&ip->ref, ipath_release_mmap_info);
-}
-
-static const struct vm_operations_struct ipath_vm_ops = {
- .open = ipath_vma_open,
- .close = ipath_vma_close,
-};
-
-/**
- * ipath_mmap - create a new mmap region
- * @context: the IB user context of the process making the mmap() call
- * @vma: the VMA to be initialized
- * Return zero if the mmap is OK. Otherwise, return an errno.
- */
-int ipath_mmap(struct ib_ucontext *context, struct vm_area_struct *vma)
-{
- struct ipath_ibdev *dev = to_idev(context->device);
- unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
- unsigned long size = vma->vm_end - vma->vm_start;
- struct ipath_mmap_info *ip, *pp;
- int ret = -EINVAL;
-
- /*
- * Search the device's list of objects waiting for a mmap call.
- * Normally, this list is very short since a call to create a
- * CQ, QP, or SRQ is soon followed by a call to mmap().
- */
- spin_lock_irq(&dev->pending_lock);
- list_for_each_entry_safe(ip, pp, &dev->pending_mmaps,
- pending_mmaps) {
- /* Only the creator is allowed to mmap the object */
- if (context != ip->context || (__u64) offset != ip->offset)
- continue;
- /* Don't allow a mmap larger than the object. */
- if (size > ip->size)
- break;
-
- list_del_init(&ip->pending_mmaps);
- spin_unlock_irq(&dev->pending_lock);
-
- ret = remap_vmalloc_range(vma, ip->obj, 0);
- if (ret)
- goto done;
- vma->vm_ops = &ipath_vm_ops;
- vma->vm_private_data = ip;
- ipath_vma_open(vma);
- goto done;
- }
- spin_unlock_irq(&dev->pending_lock);
-done:
- return ret;
-}
-
-/*
- * Allocate information for ipath_mmap
- */
-struct ipath_mmap_info *ipath_create_mmap_info(struct ipath_ibdev *dev,
- u32 size,
- struct ib_ucontext *context,
- void *obj) {
- struct ipath_mmap_info *ip;
-
- ip = kmalloc(sizeof *ip, GFP_KERNEL);
- if (!ip)
- goto bail;
-
- size = PAGE_ALIGN(size);
-
- spin_lock_irq(&dev->mmap_offset_lock);
- if (dev->mmap_offset == 0)
- dev->mmap_offset = PAGE_SIZE;
- ip->offset = dev->mmap_offset;
- dev->mmap_offset += size;
- spin_unlock_irq(&dev->mmap_offset_lock);
-
- INIT_LIST_HEAD(&ip->pending_mmaps);
- ip->size = size;
- ip->context = context;
- ip->obj = obj;
- kref_init(&ip->ref);
-
-bail:
- return ip;
-}
-
-void ipath_update_mmap_info(struct ipath_ibdev *dev,
- struct ipath_mmap_info *ip,
- u32 size, void *obj) {
- size = PAGE_ALIGN(size);
-
- spin_lock_irq(&dev->mmap_offset_lock);
- if (dev->mmap_offset == 0)
- dev->mmap_offset = PAGE_SIZE;
- ip->offset = dev->mmap_offset;
- dev->mmap_offset += size;
- spin_unlock_irq(&dev->mmap_offset_lock);
-
- ip->size = size;
- ip->obj = obj;
-}
Code Review / kvmfornfv.git / blobdiff