63fa15dbd4
Add SPDX headers to all rxe .c and .h files. Link: https://lore.kernel.org/r/20200827145439.2273-1-rpearson@hpe.com Signed-off-by: Bob Pearson <rpearson@hpe.com> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
150 lines
3.5 KiB
C
150 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
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/*
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* Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.
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* Copyright (c) 2015 System Fabric Works, Inc. All rights reserved.
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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 <rdma/uverbs_ioctl.h>
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#include "rxe.h"
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#include "rxe_loc.h"
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#include "rxe_queue.h"
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void rxe_mmap_release(struct kref *ref)
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{
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struct rxe_mmap_info *ip = container_of(ref,
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struct rxe_mmap_info, ref);
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struct rxe_dev *rxe = to_rdev(ip->context->device);
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spin_lock_bh(&rxe->pending_lock);
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if (!list_empty(&ip->pending_mmaps))
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list_del(&ip->pending_mmaps);
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spin_unlock_bh(&rxe->pending_lock);
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vfree(ip->obj); /* buf */
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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 memory region is mapped,
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* to avoid releasing it.
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*/
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static void rxe_vma_open(struct vm_area_struct *vma)
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{
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struct rxe_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 rxe_vma_close(struct vm_area_struct *vma)
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{
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struct rxe_mmap_info *ip = vma->vm_private_data;
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kref_put(&ip->ref, rxe_mmap_release);
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}
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static const struct vm_operations_struct rxe_vm_ops = {
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.open = rxe_vma_open,
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.close = rxe_vma_close,
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};
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/**
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* rxe_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 rxe_mmap(struct ib_ucontext *context, struct vm_area_struct *vma)
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{
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struct rxe_dev *rxe = to_rdev(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 rxe_mmap_info *ip, *pp;
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int ret;
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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_bh(&rxe->pending_lock);
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list_for_each_entry_safe(ip, pp, &rxe->pending_mmaps, pending_mmaps) {
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if (context != ip->context || (__u64)offset != ip->info.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->info.size) {
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pr_err("mmap region is larger than the object!\n");
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spin_unlock_bh(&rxe->pending_lock);
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ret = -EINVAL;
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goto done;
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}
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goto found_it;
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}
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pr_warn("unable to find pending mmap info\n");
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spin_unlock_bh(&rxe->pending_lock);
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ret = -EINVAL;
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goto done;
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found_it:
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list_del_init(&ip->pending_mmaps);
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spin_unlock_bh(&rxe->pending_lock);
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ret = remap_vmalloc_range(vma, ip->obj, 0);
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if (ret) {
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pr_err("err %d from remap_vmalloc_range\n", ret);
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goto done;
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}
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vma->vm_ops = &rxe_vm_ops;
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vma->vm_private_data = ip;
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rxe_vma_open(vma);
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done:
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return ret;
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}
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/*
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* Allocate information for rxe_mmap
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*/
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struct rxe_mmap_info *rxe_create_mmap_info(struct rxe_dev *rxe, u32 size,
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struct ib_udata *udata, void *obj)
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{
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struct rxe_mmap_info *ip;
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if (!udata)
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return ERR_PTR(-EINVAL);
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ip = kmalloc(sizeof(*ip), GFP_KERNEL);
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if (!ip)
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return ERR_PTR(-ENOMEM);
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size = PAGE_ALIGN(size);
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spin_lock_bh(&rxe->mmap_offset_lock);
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if (rxe->mmap_offset == 0)
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rxe->mmap_offset = ALIGN(PAGE_SIZE, SHMLBA);
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ip->info.offset = rxe->mmap_offset;
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rxe->mmap_offset += ALIGN(size, SHMLBA);
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spin_unlock_bh(&rxe->mmap_offset_lock);
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INIT_LIST_HEAD(&ip->pending_mmaps);
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ip->info.size = size;
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ip->context =
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container_of(udata, struct uverbs_attr_bundle, driver_udata)
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->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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