| /* |
| * |
| * This file is provided under a dual BSD/GPLv2 license. When using or |
| * redistributing this file, you may do so under either license. |
| * |
| * GPL LICENSE SUMMARY |
| * |
| * Copyright(c) 2015 Intel Corporation. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of version 2 of the GNU General Public License as |
| * published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, but |
| * WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License for more details. |
| * |
| * BSD LICENSE |
| * |
| * Copyright(c) 2015 Intel Corporation. |
| * |
| * 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. |
| * - Neither the name of Intel Corporation nor the names of its |
| * contributors may be used to endorse or promote products derived |
| * from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| * |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/slab.h> |
| #include <linux/vmalloc.h> |
| #include <linux/mm.h> |
| #include <linux/errno.h> |
| #include <asm/pgtable.h> |
| |
| #include "verbs.h" |
| |
| /** |
| * hfi1_release_mmap_info - free mmap info structure |
| * @ref: a pointer to the kref within struct hfi1_mmap_info |
| */ |
| void hfi1_release_mmap_info(struct kref *ref) |
| { |
| struct hfi1_mmap_info *ip = |
| container_of(ref, struct hfi1_mmap_info, ref); |
| struct hfi1_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 hfi1_vma_open(struct vm_area_struct *vma) |
| { |
| struct hfi1_mmap_info *ip = vma->vm_private_data; |
| |
| kref_get(&ip->ref); |
| } |
| |
| static void hfi1_vma_close(struct vm_area_struct *vma) |
| { |
| struct hfi1_mmap_info *ip = vma->vm_private_data; |
| |
| kref_put(&ip->ref, hfi1_release_mmap_info); |
| } |
| |
| static struct vm_operations_struct hfi1_vm_ops = { |
| .open = hfi1_vma_open, |
| .close = hfi1_vma_close, |
| }; |
| |
| /** |
| * hfi1_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 hfi1_mmap(struct ib_ucontext *context, struct vm_area_struct *vma) |
| { |
| struct hfi1_ibdev *dev = to_idev(context->device); |
| unsigned long offset = vma->vm_pgoff << PAGE_SHIFT; |
| unsigned long size = vma->vm_end - vma->vm_start; |
| struct hfi1_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 = &hfi1_vm_ops; |
| vma->vm_private_data = ip; |
| hfi1_vma_open(vma); |
| goto done; |
| } |
| spin_unlock_irq(&dev->pending_lock); |
| done: |
| return ret; |
| } |
| |
| /* |
| * Allocate information for hfi1_mmap |
| */ |
| struct hfi1_mmap_info *hfi1_create_mmap_info(struct hfi1_ibdev *dev, |
| u32 size, |
| struct ib_ucontext *context, |
| void *obj) { |
| struct hfi1_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 hfi1_update_mmap_info(struct hfi1_ibdev *dev, struct hfi1_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; |
| } |