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149 lines
3.5 KiB
149 lines
3.5 KiB
// 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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