209 строки
6.0 KiB
C
209 строки
6.0 KiB
C
/*
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* Copyright(c) 2016 Intel Corporation.
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*
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* This file is provided under a dual BSD/GPLv2 license. When using or
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* redistributing this file, you may do so under either license.
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*
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* GPL LICENSE SUMMARY
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* BSD LICENSE
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* - Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <linux/mm.h>
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#include <asm/pgtable.h>
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#include "mmap.h"
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/**
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* rvt_mmap_init - init link list and lock for mem map
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* @rdi: rvt dev struct
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*/
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void rvt_mmap_init(struct rvt_dev_info *rdi)
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{
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INIT_LIST_HEAD(&rdi->pending_mmaps);
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spin_lock_init(&rdi->pending_lock);
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rdi->mmap_offset = PAGE_SIZE;
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spin_lock_init(&rdi->mmap_offset_lock);
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}
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/**
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* rvt_release_mmap_info - free mmap info structure
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* @ref: a pointer to the kref within struct rvt_mmap_info
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*/
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void rvt_release_mmap_info(struct kref *ref)
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{
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struct rvt_mmap_info *ip =
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container_of(ref, struct rvt_mmap_info, ref);
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struct rvt_dev_info *rdi = ib_to_rvt(ip->context->device);
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spin_lock_irq(&rdi->pending_lock);
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list_del(&ip->pending_mmaps);
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spin_unlock_irq(&rdi->pending_lock);
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vfree(ip->obj);
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kfree(ip);
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}
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static void rvt_vma_open(struct vm_area_struct *vma)
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{
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struct rvt_mmap_info *ip = vma->vm_private_data;
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kref_get(&ip->ref);
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}
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static void rvt_vma_close(struct vm_area_struct *vma)
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{
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struct rvt_mmap_info *ip = vma->vm_private_data;
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kref_put(&ip->ref, rvt_release_mmap_info);
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}
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static const struct vm_operations_struct rvt_vm_ops = {
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.open = rvt_vma_open,
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.close = rvt_vma_close,
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};
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/**
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* rvt_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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*
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* Return: zero if the mmap is OK. Otherwise, return an errno.
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*/
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int rvt_mmap(struct ib_ucontext *context, struct vm_area_struct *vma)
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{
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struct rvt_dev_info *rdi = ib_to_rvt(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 rvt_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(&rdi->pending_lock);
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list_for_each_entry_safe(ip, pp, &rdi->pending_mmaps,
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pending_mmaps) {
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/* Only the creator is allowed to mmap the object */
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if (context != ip->context || (__u64)offset != ip->offset)
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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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list_del_init(&ip->pending_mmaps);
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spin_unlock_irq(&rdi->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 = &rvt_vm_ops;
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vma->vm_private_data = ip;
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rvt_vma_open(vma);
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goto done;
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}
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spin_unlock_irq(&rdi->pending_lock);
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done:
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return ret;
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}
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/**
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* rvt_create_mmap_info - allocate information for hfi1_mmap
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* @rdi: rvt dev struct
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* @size: size in bytes to map
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* @context: user context
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* @obj: opaque pointer to a cq, wq etc
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*
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* Return: rvt_mmap struct on success
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*/
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struct rvt_mmap_info *rvt_create_mmap_info(struct rvt_dev_info *rdi,
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u32 size,
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struct ib_ucontext *context,
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void *obj)
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{
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struct rvt_mmap_info *ip;
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ip = kmalloc_node(sizeof(*ip), GFP_KERNEL, rdi->dparms.node);
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if (!ip)
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return ip;
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size = PAGE_ALIGN(size);
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spin_lock_irq(&rdi->mmap_offset_lock);
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if (rdi->mmap_offset == 0)
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rdi->mmap_offset = ALIGN(PAGE_SIZE, SHMLBA);
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ip->offset = rdi->mmap_offset;
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rdi->mmap_offset += ALIGN(size, SHMLBA);
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spin_unlock_irq(&rdi->mmap_offset_lock);
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INIT_LIST_HEAD(&ip->pending_mmaps);
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ip->size = size;
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ip->context = context;
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ip->obj = obj;
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kref_init(&ip->ref);
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return ip;
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}
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/**
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* rvt_update_mmap_info - update a mem map
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* @rdi: rvt dev struct
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* @ip: mmap info pointer
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* @size: size to grow by
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* @obj: opaque pointer to cq, wq, etc.
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*/
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void rvt_update_mmap_info(struct rvt_dev_info *rdi, struct rvt_mmap_info *ip,
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u32 size, void *obj)
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{
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size = PAGE_ALIGN(size);
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spin_lock_irq(&rdi->mmap_offset_lock);
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if (rdi->mmap_offset == 0)
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rdi->mmap_offset = PAGE_SIZE;
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ip->offset = rdi->mmap_offset;
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rdi->mmap_offset += size;
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spin_unlock_irq(&rdi->mmap_offset_lock);
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ip->size = size;
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ip->obj = obj;
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}
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