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1317 lines
34 KiB
1317 lines
34 KiB
/* |
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* Copyright (c) 2005 Topspin Communications. All rights reserved. |
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* Copyright (c) 2005, 2006 Cisco Systems. All rights reserved. |
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* Copyright (c) 2005 Mellanox Technologies. All rights reserved. |
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* Copyright (c) 2005 Voltaire, Inc. All rights reserved. |
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* Copyright (c) 2005 PathScale, Inc. All rights reserved. |
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* |
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* This software is available to you under a choice of one of two |
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* licenses. You may choose to be licensed under the terms of the GNU |
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* General Public License (GPL) Version 2, available from the file |
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* COPYING in the main directory of this source tree, or the |
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* OpenIB.org BSD license below: |
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* |
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* Redistribution and use in source and binary forms, with or |
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* without modification, are permitted provided that the following |
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* conditions are met: |
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* |
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* - Redistributions of source code must retain the above |
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* copyright notice, this list of conditions and the following |
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* disclaimer. |
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* |
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* - Redistributions in binary form must reproduce the above |
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* copyright notice, this list of conditions and the following |
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* disclaimer in the documentation and/or other materials |
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* provided with the distribution. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS |
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN |
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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* SOFTWARE. |
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*/ |
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|
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#include <linux/module.h> |
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#include <linux/init.h> |
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#include <linux/device.h> |
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#include <linux/err.h> |
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#include <linux/fs.h> |
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#include <linux/poll.h> |
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#include <linux/sched.h> |
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#include <linux/file.h> |
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#include <linux/cdev.h> |
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#include <linux/anon_inodes.h> |
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#include <linux/slab.h> |
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#include <linux/sched/mm.h> |
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|
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#include <linux/uaccess.h> |
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|
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#include <rdma/ib.h> |
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#include <rdma/uverbs_std_types.h> |
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#include <rdma/rdma_netlink.h> |
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|
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#include "uverbs.h" |
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#include "core_priv.h" |
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#include "rdma_core.h" |
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|
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MODULE_AUTHOR("Roland Dreier"); |
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MODULE_DESCRIPTION("InfiniBand userspace verbs access"); |
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MODULE_LICENSE("Dual BSD/GPL"); |
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enum { |
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IB_UVERBS_MAJOR = 231, |
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IB_UVERBS_BASE_MINOR = 192, |
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IB_UVERBS_MAX_DEVICES = RDMA_MAX_PORTS, |
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IB_UVERBS_NUM_FIXED_MINOR = 32, |
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IB_UVERBS_NUM_DYNAMIC_MINOR = IB_UVERBS_MAX_DEVICES - IB_UVERBS_NUM_FIXED_MINOR, |
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}; |
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|
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#define IB_UVERBS_BASE_DEV MKDEV(IB_UVERBS_MAJOR, IB_UVERBS_BASE_MINOR) |
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|
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static dev_t dynamic_uverbs_dev; |
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static struct class *uverbs_class; |
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|
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static DEFINE_IDA(uverbs_ida); |
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static int ib_uverbs_add_one(struct ib_device *device); |
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static void ib_uverbs_remove_one(struct ib_device *device, void *client_data); |
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|
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/* |
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* Must be called with the ufile->device->disassociate_srcu held, and the lock |
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* must be held until use of the ucontext is finished. |
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*/ |
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struct ib_ucontext *ib_uverbs_get_ucontext_file(struct ib_uverbs_file *ufile) |
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{ |
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/* |
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* We do not hold the hw_destroy_rwsem lock for this flow, instead |
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* srcu is used. It does not matter if someone races this with |
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* get_context, we get NULL or valid ucontext. |
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*/ |
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struct ib_ucontext *ucontext = smp_load_acquire(&ufile->ucontext); |
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|
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if (!srcu_dereference(ufile->device->ib_dev, |
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&ufile->device->disassociate_srcu)) |
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return ERR_PTR(-EIO); |
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|
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if (!ucontext) |
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return ERR_PTR(-EINVAL); |
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return ucontext; |
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} |
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EXPORT_SYMBOL(ib_uverbs_get_ucontext_file); |
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|
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int uverbs_dealloc_mw(struct ib_mw *mw) |
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{ |
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struct ib_pd *pd = mw->pd; |
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int ret; |
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|
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ret = mw->device->ops.dealloc_mw(mw); |
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if (ret) |
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return ret; |
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atomic_dec(&pd->usecnt); |
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kfree(mw); |
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return ret; |
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} |
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|
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static void ib_uverbs_release_dev(struct device *device) |
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{ |
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struct ib_uverbs_device *dev = |
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container_of(device, struct ib_uverbs_device, dev); |
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uverbs_destroy_api(dev->uapi); |
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cleanup_srcu_struct(&dev->disassociate_srcu); |
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mutex_destroy(&dev->lists_mutex); |
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mutex_destroy(&dev->xrcd_tree_mutex); |
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kfree(dev); |
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} |
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|
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void ib_uverbs_release_ucq(struct ib_uverbs_completion_event_file *ev_file, |
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struct ib_ucq_object *uobj) |
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{ |
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struct ib_uverbs_event *evt, *tmp; |
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|
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if (ev_file) { |
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spin_lock_irq(&ev_file->ev_queue.lock); |
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list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) { |
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list_del(&evt->list); |
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kfree(evt); |
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} |
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spin_unlock_irq(&ev_file->ev_queue.lock); |
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|
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uverbs_uobject_put(&ev_file->uobj); |
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} |
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|
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ib_uverbs_release_uevent(&uobj->uevent); |
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} |
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void ib_uverbs_release_uevent(struct ib_uevent_object *uobj) |
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{ |
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struct ib_uverbs_async_event_file *async_file = uobj->event_file; |
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struct ib_uverbs_event *evt, *tmp; |
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|
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if (!async_file) |
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return; |
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spin_lock_irq(&async_file->ev_queue.lock); |
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list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) { |
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list_del(&evt->list); |
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kfree(evt); |
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} |
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spin_unlock_irq(&async_file->ev_queue.lock); |
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uverbs_uobject_put(&async_file->uobj); |
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} |
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|
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void ib_uverbs_detach_umcast(struct ib_qp *qp, |
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struct ib_uqp_object *uobj) |
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{ |
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struct ib_uverbs_mcast_entry *mcast, *tmp; |
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|
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list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) { |
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ib_detach_mcast(qp, &mcast->gid, mcast->lid); |
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list_del(&mcast->list); |
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kfree(mcast); |
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} |
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} |
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static void ib_uverbs_comp_dev(struct ib_uverbs_device *dev) |
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{ |
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complete(&dev->comp); |
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} |
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void ib_uverbs_release_file(struct kref *ref) |
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{ |
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struct ib_uverbs_file *file = |
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container_of(ref, struct ib_uverbs_file, ref); |
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struct ib_device *ib_dev; |
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int srcu_key; |
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|
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release_ufile_idr_uobject(file); |
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srcu_key = srcu_read_lock(&file->device->disassociate_srcu); |
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ib_dev = srcu_dereference(file->device->ib_dev, |
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&file->device->disassociate_srcu); |
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if (ib_dev && !ib_dev->ops.disassociate_ucontext) |
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module_put(ib_dev->ops.owner); |
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srcu_read_unlock(&file->device->disassociate_srcu, srcu_key); |
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|
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if (atomic_dec_and_test(&file->device->refcount)) |
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ib_uverbs_comp_dev(file->device); |
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if (file->default_async_file) |
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uverbs_uobject_put(&file->default_async_file->uobj); |
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put_device(&file->device->dev); |
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if (file->disassociate_page) |
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__free_pages(file->disassociate_page, 0); |
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mutex_destroy(&file->umap_lock); |
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mutex_destroy(&file->ucontext_lock); |
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kfree(file); |
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} |
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static ssize_t ib_uverbs_event_read(struct ib_uverbs_event_queue *ev_queue, |
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struct file *filp, char __user *buf, |
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size_t count, loff_t *pos, |
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size_t eventsz) |
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{ |
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struct ib_uverbs_event *event; |
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int ret = 0; |
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spin_lock_irq(&ev_queue->lock); |
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|
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while (list_empty(&ev_queue->event_list)) { |
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spin_unlock_irq(&ev_queue->lock); |
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if (filp->f_flags & O_NONBLOCK) |
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return -EAGAIN; |
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if (wait_event_interruptible(ev_queue->poll_wait, |
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(!list_empty(&ev_queue->event_list) || |
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ev_queue->is_closed))) |
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return -ERESTARTSYS; |
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spin_lock_irq(&ev_queue->lock); |
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|
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/* If device was disassociated and no event exists set an error */ |
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if (list_empty(&ev_queue->event_list) && ev_queue->is_closed) { |
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spin_unlock_irq(&ev_queue->lock); |
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return -EIO; |
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} |
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} |
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event = list_entry(ev_queue->event_list.next, struct ib_uverbs_event, list); |
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if (eventsz > count) { |
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ret = -EINVAL; |
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event = NULL; |
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} else { |
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list_del(ev_queue->event_list.next); |
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if (event->counter) { |
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++(*event->counter); |
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list_del(&event->obj_list); |
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} |
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} |
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spin_unlock_irq(&ev_queue->lock); |
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if (event) { |
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if (copy_to_user(buf, event, eventsz)) |
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ret = -EFAULT; |
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else |
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ret = eventsz; |
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} |
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kfree(event); |
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return ret; |
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} |
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static ssize_t ib_uverbs_async_event_read(struct file *filp, char __user *buf, |
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size_t count, loff_t *pos) |
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{ |
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struct ib_uverbs_async_event_file *file = filp->private_data; |
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|
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return ib_uverbs_event_read(&file->ev_queue, filp, buf, count, pos, |
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sizeof(struct ib_uverbs_async_event_desc)); |
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} |
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static ssize_t ib_uverbs_comp_event_read(struct file *filp, char __user *buf, |
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size_t count, loff_t *pos) |
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{ |
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struct ib_uverbs_completion_event_file *comp_ev_file = |
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filp->private_data; |
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return ib_uverbs_event_read(&comp_ev_file->ev_queue, filp, buf, count, |
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pos, |
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sizeof(struct ib_uverbs_comp_event_desc)); |
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} |
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static __poll_t ib_uverbs_event_poll(struct ib_uverbs_event_queue *ev_queue, |
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struct file *filp, |
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struct poll_table_struct *wait) |
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{ |
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__poll_t pollflags = 0; |
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|
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poll_wait(filp, &ev_queue->poll_wait, wait); |
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|
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spin_lock_irq(&ev_queue->lock); |
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if (!list_empty(&ev_queue->event_list)) |
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pollflags = EPOLLIN | EPOLLRDNORM; |
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else if (ev_queue->is_closed) |
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pollflags = EPOLLERR; |
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spin_unlock_irq(&ev_queue->lock); |
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|
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return pollflags; |
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} |
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static __poll_t ib_uverbs_async_event_poll(struct file *filp, |
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struct poll_table_struct *wait) |
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{ |
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struct ib_uverbs_async_event_file *file = filp->private_data; |
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|
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return ib_uverbs_event_poll(&file->ev_queue, filp, wait); |
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} |
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static __poll_t ib_uverbs_comp_event_poll(struct file *filp, |
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struct poll_table_struct *wait) |
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{ |
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struct ib_uverbs_completion_event_file *comp_ev_file = |
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filp->private_data; |
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return ib_uverbs_event_poll(&comp_ev_file->ev_queue, filp, wait); |
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} |
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static int ib_uverbs_async_event_fasync(int fd, struct file *filp, int on) |
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{ |
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struct ib_uverbs_async_event_file *file = filp->private_data; |
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return fasync_helper(fd, filp, on, &file->ev_queue.async_queue); |
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} |
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static int ib_uverbs_comp_event_fasync(int fd, struct file *filp, int on) |
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{ |
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struct ib_uverbs_completion_event_file *comp_ev_file = |
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filp->private_data; |
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return fasync_helper(fd, filp, on, &comp_ev_file->ev_queue.async_queue); |
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} |
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const struct file_operations uverbs_event_fops = { |
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.owner = THIS_MODULE, |
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.read = ib_uverbs_comp_event_read, |
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.poll = ib_uverbs_comp_event_poll, |
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.release = uverbs_uobject_fd_release, |
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.fasync = ib_uverbs_comp_event_fasync, |
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.llseek = no_llseek, |
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}; |
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const struct file_operations uverbs_async_event_fops = { |
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.owner = THIS_MODULE, |
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.read = ib_uverbs_async_event_read, |
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.poll = ib_uverbs_async_event_poll, |
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.release = uverbs_async_event_release, |
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.fasync = ib_uverbs_async_event_fasync, |
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.llseek = no_llseek, |
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}; |
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|
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void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context) |
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{ |
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struct ib_uverbs_event_queue *ev_queue = cq_context; |
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struct ib_ucq_object *uobj; |
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struct ib_uverbs_event *entry; |
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unsigned long flags; |
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|
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if (!ev_queue) |
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return; |
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|
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spin_lock_irqsave(&ev_queue->lock, flags); |
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if (ev_queue->is_closed) { |
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spin_unlock_irqrestore(&ev_queue->lock, flags); |
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return; |
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} |
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|
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entry = kmalloc(sizeof(*entry), GFP_ATOMIC); |
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if (!entry) { |
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spin_unlock_irqrestore(&ev_queue->lock, flags); |
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return; |
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} |
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|
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uobj = cq->uobject; |
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|
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entry->desc.comp.cq_handle = cq->uobject->uevent.uobject.user_handle; |
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entry->counter = &uobj->comp_events_reported; |
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|
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list_add_tail(&entry->list, &ev_queue->event_list); |
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list_add_tail(&entry->obj_list, &uobj->comp_list); |
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spin_unlock_irqrestore(&ev_queue->lock, flags); |
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|
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wake_up_interruptible(&ev_queue->poll_wait); |
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kill_fasync(&ev_queue->async_queue, SIGIO, POLL_IN); |
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} |
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|
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void ib_uverbs_async_handler(struct ib_uverbs_async_event_file *async_file, |
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__u64 element, __u64 event, |
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struct list_head *obj_list, u32 *counter) |
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{ |
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struct ib_uverbs_event *entry; |
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unsigned long flags; |
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|
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if (!async_file) |
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return; |
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|
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spin_lock_irqsave(&async_file->ev_queue.lock, flags); |
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if (async_file->ev_queue.is_closed) { |
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spin_unlock_irqrestore(&async_file->ev_queue.lock, flags); |
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return; |
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} |
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|
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entry = kmalloc(sizeof(*entry), GFP_ATOMIC); |
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if (!entry) { |
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spin_unlock_irqrestore(&async_file->ev_queue.lock, flags); |
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return; |
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} |
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|
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entry->desc.async.element = element; |
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entry->desc.async.event_type = event; |
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entry->desc.async.reserved = 0; |
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entry->counter = counter; |
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|
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list_add_tail(&entry->list, &async_file->ev_queue.event_list); |
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if (obj_list) |
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list_add_tail(&entry->obj_list, obj_list); |
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spin_unlock_irqrestore(&async_file->ev_queue.lock, flags); |
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|
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wake_up_interruptible(&async_file->ev_queue.poll_wait); |
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kill_fasync(&async_file->ev_queue.async_queue, SIGIO, POLL_IN); |
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} |
|
|
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static void uverbs_uobj_event(struct ib_uevent_object *eobj, |
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struct ib_event *event) |
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{ |
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ib_uverbs_async_handler(eobj->event_file, |
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eobj->uobject.user_handle, event->event, |
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&eobj->event_list, &eobj->events_reported); |
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} |
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|
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void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr) |
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{ |
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uverbs_uobj_event(&event->element.cq->uobject->uevent, event); |
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} |
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|
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void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr) |
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{ |
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/* for XRC target qp's, check that qp is live */ |
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if (!event->element.qp->uobject) |
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return; |
|
|
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uverbs_uobj_event(&event->element.qp->uobject->uevent, event); |
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} |
|
|
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void ib_uverbs_wq_event_handler(struct ib_event *event, void *context_ptr) |
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{ |
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uverbs_uobj_event(&event->element.wq->uobject->uevent, event); |
|
} |
|
|
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void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr) |
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{ |
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uverbs_uobj_event(&event->element.srq->uobject->uevent, event); |
|
} |
|
|
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static void ib_uverbs_event_handler(struct ib_event_handler *handler, |
|
struct ib_event *event) |
|
{ |
|
ib_uverbs_async_handler( |
|
container_of(handler, struct ib_uverbs_async_event_file, |
|
event_handler), |
|
event->element.port_num, event->event, NULL, NULL); |
|
} |
|
|
|
void ib_uverbs_init_event_queue(struct ib_uverbs_event_queue *ev_queue) |
|
{ |
|
spin_lock_init(&ev_queue->lock); |
|
INIT_LIST_HEAD(&ev_queue->event_list); |
|
init_waitqueue_head(&ev_queue->poll_wait); |
|
ev_queue->is_closed = 0; |
|
ev_queue->async_queue = NULL; |
|
} |
|
|
|
void ib_uverbs_init_async_event_file( |
|
struct ib_uverbs_async_event_file *async_file) |
|
{ |
|
struct ib_uverbs_file *uverbs_file = async_file->uobj.ufile; |
|
struct ib_device *ib_dev = async_file->uobj.context->device; |
|
|
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ib_uverbs_init_event_queue(&async_file->ev_queue); |
|
|
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/* The first async_event_file becomes the default one for the file. */ |
|
mutex_lock(&uverbs_file->ucontext_lock); |
|
if (!uverbs_file->default_async_file) { |
|
/* Pairs with the put in ib_uverbs_release_file */ |
|
uverbs_uobject_get(&async_file->uobj); |
|
smp_store_release(&uverbs_file->default_async_file, async_file); |
|
} |
|
mutex_unlock(&uverbs_file->ucontext_lock); |
|
|
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INIT_IB_EVENT_HANDLER(&async_file->event_handler, ib_dev, |
|
ib_uverbs_event_handler); |
|
ib_register_event_handler(&async_file->event_handler); |
|
} |
|
|
|
static ssize_t verify_hdr(struct ib_uverbs_cmd_hdr *hdr, |
|
struct ib_uverbs_ex_cmd_hdr *ex_hdr, size_t count, |
|
const struct uverbs_api_write_method *method_elm) |
|
{ |
|
if (method_elm->is_ex) { |
|
count -= sizeof(*hdr) + sizeof(*ex_hdr); |
|
|
|
if ((hdr->in_words + ex_hdr->provider_in_words) * 8 != count) |
|
return -EINVAL; |
|
|
|
if (hdr->in_words * 8 < method_elm->req_size) |
|
return -ENOSPC; |
|
|
|
if (ex_hdr->cmd_hdr_reserved) |
|
return -EINVAL; |
|
|
|
if (ex_hdr->response) { |
|
if (!hdr->out_words && !ex_hdr->provider_out_words) |
|
return -EINVAL; |
|
|
|
if (hdr->out_words * 8 < method_elm->resp_size) |
|
return -ENOSPC; |
|
|
|
if (!access_ok(u64_to_user_ptr(ex_hdr->response), |
|
(hdr->out_words + ex_hdr->provider_out_words) * 8)) |
|
return -EFAULT; |
|
} else { |
|
if (hdr->out_words || ex_hdr->provider_out_words) |
|
return -EINVAL; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
/* not extended command */ |
|
if (hdr->in_words * 4 != count) |
|
return -EINVAL; |
|
|
|
if (count < method_elm->req_size + sizeof(hdr)) { |
|
/* |
|
* rdma-core v18 and v19 have a bug where they send DESTROY_CQ |
|
* with a 16 byte write instead of 24. Old kernels didn't |
|
* check the size so they allowed this. Now that the size is |
|
* checked provide a compatibility work around to not break |
|
* those userspaces. |
|
*/ |
|
if (hdr->command == IB_USER_VERBS_CMD_DESTROY_CQ && |
|
count == 16) { |
|
hdr->in_words = 6; |
|
return 0; |
|
} |
|
return -ENOSPC; |
|
} |
|
if (hdr->out_words * 4 < method_elm->resp_size) |
|
return -ENOSPC; |
|
|
|
return 0; |
|
} |
|
|
|
static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf, |
|
size_t count, loff_t *pos) |
|
{ |
|
struct ib_uverbs_file *file = filp->private_data; |
|
const struct uverbs_api_write_method *method_elm; |
|
struct uverbs_api *uapi = file->device->uapi; |
|
struct ib_uverbs_ex_cmd_hdr ex_hdr; |
|
struct ib_uverbs_cmd_hdr hdr; |
|
struct uverbs_attr_bundle bundle; |
|
int srcu_key; |
|
ssize_t ret; |
|
|
|
if (!ib_safe_file_access(filp)) { |
|
pr_err_once("uverbs_write: process %d (%s) changed security contexts after opening file descriptor, this is not allowed.\n", |
|
task_tgid_vnr(current), current->comm); |
|
return -EACCES; |
|
} |
|
|
|
if (count < sizeof(hdr)) |
|
return -EINVAL; |
|
|
|
if (copy_from_user(&hdr, buf, sizeof(hdr))) |
|
return -EFAULT; |
|
|
|
method_elm = uapi_get_method(uapi, hdr.command); |
|
if (IS_ERR(method_elm)) |
|
return PTR_ERR(method_elm); |
|
|
|
if (method_elm->is_ex) { |
|
if (count < (sizeof(hdr) + sizeof(ex_hdr))) |
|
return -EINVAL; |
|
if (copy_from_user(&ex_hdr, buf + sizeof(hdr), sizeof(ex_hdr))) |
|
return -EFAULT; |
|
} |
|
|
|
ret = verify_hdr(&hdr, &ex_hdr, count, method_elm); |
|
if (ret) |
|
return ret; |
|
|
|
srcu_key = srcu_read_lock(&file->device->disassociate_srcu); |
|
|
|
buf += sizeof(hdr); |
|
|
|
memset(bundle.attr_present, 0, sizeof(bundle.attr_present)); |
|
bundle.ufile = file; |
|
bundle.context = NULL; /* only valid if bundle has uobject */ |
|
bundle.uobject = NULL; |
|
if (!method_elm->is_ex) { |
|
size_t in_len = hdr.in_words * 4 - sizeof(hdr); |
|
size_t out_len = hdr.out_words * 4; |
|
u64 response = 0; |
|
|
|
if (method_elm->has_udata) { |
|
bundle.driver_udata.inlen = |
|
in_len - method_elm->req_size; |
|
in_len = method_elm->req_size; |
|
if (bundle.driver_udata.inlen) |
|
bundle.driver_udata.inbuf = buf + in_len; |
|
else |
|
bundle.driver_udata.inbuf = NULL; |
|
} else { |
|
memset(&bundle.driver_udata, 0, |
|
sizeof(bundle.driver_udata)); |
|
} |
|
|
|
if (method_elm->has_resp) { |
|
/* |
|
* The macros check that if has_resp is set |
|
* then the command request structure starts |
|
* with a '__aligned u64 response' member. |
|
*/ |
|
ret = get_user(response, (const u64 __user *)buf); |
|
if (ret) |
|
goto out_unlock; |
|
|
|
if (method_elm->has_udata) { |
|
bundle.driver_udata.outlen = |
|
out_len - method_elm->resp_size; |
|
out_len = method_elm->resp_size; |
|
if (bundle.driver_udata.outlen) |
|
bundle.driver_udata.outbuf = |
|
u64_to_user_ptr(response + |
|
out_len); |
|
else |
|
bundle.driver_udata.outbuf = NULL; |
|
} |
|
} else { |
|
bundle.driver_udata.outlen = 0; |
|
bundle.driver_udata.outbuf = NULL; |
|
} |
|
|
|
ib_uverbs_init_udata_buf_or_null( |
|
&bundle.ucore, buf, u64_to_user_ptr(response), |
|
in_len, out_len); |
|
} else { |
|
buf += sizeof(ex_hdr); |
|
|
|
ib_uverbs_init_udata_buf_or_null(&bundle.ucore, buf, |
|
u64_to_user_ptr(ex_hdr.response), |
|
hdr.in_words * 8, hdr.out_words * 8); |
|
|
|
ib_uverbs_init_udata_buf_or_null( |
|
&bundle.driver_udata, buf + bundle.ucore.inlen, |
|
u64_to_user_ptr(ex_hdr.response) + bundle.ucore.outlen, |
|
ex_hdr.provider_in_words * 8, |
|
ex_hdr.provider_out_words * 8); |
|
|
|
} |
|
|
|
ret = method_elm->handler(&bundle); |
|
if (bundle.uobject) |
|
uverbs_finalize_object(bundle.uobject, UVERBS_ACCESS_NEW, true, |
|
!ret, &bundle); |
|
out_unlock: |
|
srcu_read_unlock(&file->device->disassociate_srcu, srcu_key); |
|
return (ret) ? : count; |
|
} |
|
|
|
static const struct vm_operations_struct rdma_umap_ops; |
|
|
|
static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma) |
|
{ |
|
struct ib_uverbs_file *file = filp->private_data; |
|
struct ib_ucontext *ucontext; |
|
int ret = 0; |
|
int srcu_key; |
|
|
|
srcu_key = srcu_read_lock(&file->device->disassociate_srcu); |
|
ucontext = ib_uverbs_get_ucontext_file(file); |
|
if (IS_ERR(ucontext)) { |
|
ret = PTR_ERR(ucontext); |
|
goto out; |
|
} |
|
vma->vm_ops = &rdma_umap_ops; |
|
ret = ucontext->device->ops.mmap(ucontext, vma); |
|
out: |
|
srcu_read_unlock(&file->device->disassociate_srcu, srcu_key); |
|
return ret; |
|
} |
|
|
|
/* |
|
* The VMA has been dup'd, initialize the vm_private_data with a new tracking |
|
* struct |
|
*/ |
|
static void rdma_umap_open(struct vm_area_struct *vma) |
|
{ |
|
struct ib_uverbs_file *ufile = vma->vm_file->private_data; |
|
struct rdma_umap_priv *opriv = vma->vm_private_data; |
|
struct rdma_umap_priv *priv; |
|
|
|
if (!opriv) |
|
return; |
|
|
|
/* We are racing with disassociation */ |
|
if (!down_read_trylock(&ufile->hw_destroy_rwsem)) |
|
goto out_zap; |
|
/* |
|
* Disassociation already completed, the VMA should already be zapped. |
|
*/ |
|
if (!ufile->ucontext) |
|
goto out_unlock; |
|
|
|
priv = kzalloc(sizeof(*priv), GFP_KERNEL); |
|
if (!priv) |
|
goto out_unlock; |
|
rdma_umap_priv_init(priv, vma, opriv->entry); |
|
|
|
up_read(&ufile->hw_destroy_rwsem); |
|
return; |
|
|
|
out_unlock: |
|
up_read(&ufile->hw_destroy_rwsem); |
|
out_zap: |
|
/* |
|
* We can't allow the VMA to be created with the actual IO pages, that |
|
* would break our API contract, and it can't be stopped at this |
|
* point, so zap it. |
|
*/ |
|
vma->vm_private_data = NULL; |
|
zap_vma_ptes(vma, vma->vm_start, vma->vm_end - vma->vm_start); |
|
} |
|
|
|
static void rdma_umap_close(struct vm_area_struct *vma) |
|
{ |
|
struct ib_uverbs_file *ufile = vma->vm_file->private_data; |
|
struct rdma_umap_priv *priv = vma->vm_private_data; |
|
|
|
if (!priv) |
|
return; |
|
|
|
/* |
|
* The vma holds a reference on the struct file that created it, which |
|
* in turn means that the ib_uverbs_file is guaranteed to exist at |
|
* this point. |
|
*/ |
|
mutex_lock(&ufile->umap_lock); |
|
if (priv->entry) |
|
rdma_user_mmap_entry_put(priv->entry); |
|
|
|
list_del(&priv->list); |
|
mutex_unlock(&ufile->umap_lock); |
|
kfree(priv); |
|
} |
|
|
|
/* |
|
* Once the zap_vma_ptes has been called touches to the VMA will come here and |
|
* we return a dummy writable zero page for all the pfns. |
|
*/ |
|
static vm_fault_t rdma_umap_fault(struct vm_fault *vmf) |
|
{ |
|
struct ib_uverbs_file *ufile = vmf->vma->vm_file->private_data; |
|
struct rdma_umap_priv *priv = vmf->vma->vm_private_data; |
|
vm_fault_t ret = 0; |
|
|
|
if (!priv) |
|
return VM_FAULT_SIGBUS; |
|
|
|
/* Read only pages can just use the system zero page. */ |
|
if (!(vmf->vma->vm_flags & (VM_WRITE | VM_MAYWRITE))) { |
|
vmf->page = ZERO_PAGE(vmf->address); |
|
get_page(vmf->page); |
|
return 0; |
|
} |
|
|
|
mutex_lock(&ufile->umap_lock); |
|
if (!ufile->disassociate_page) |
|
ufile->disassociate_page = |
|
alloc_pages(vmf->gfp_mask | __GFP_ZERO, 0); |
|
|
|
if (ufile->disassociate_page) { |
|
/* |
|
* This VMA is forced to always be shared so this doesn't have |
|
* to worry about COW. |
|
*/ |
|
vmf->page = ufile->disassociate_page; |
|
get_page(vmf->page); |
|
} else { |
|
ret = VM_FAULT_SIGBUS; |
|
} |
|
mutex_unlock(&ufile->umap_lock); |
|
|
|
return ret; |
|
} |
|
|
|
static const struct vm_operations_struct rdma_umap_ops = { |
|
.open = rdma_umap_open, |
|
.close = rdma_umap_close, |
|
.fault = rdma_umap_fault, |
|
}; |
|
|
|
void uverbs_user_mmap_disassociate(struct ib_uverbs_file *ufile) |
|
{ |
|
struct rdma_umap_priv *priv, *next_priv; |
|
|
|
lockdep_assert_held(&ufile->hw_destroy_rwsem); |
|
|
|
while (1) { |
|
struct mm_struct *mm = NULL; |
|
|
|
/* Get an arbitrary mm pointer that hasn't been cleaned yet */ |
|
mutex_lock(&ufile->umap_lock); |
|
while (!list_empty(&ufile->umaps)) { |
|
int ret; |
|
|
|
priv = list_first_entry(&ufile->umaps, |
|
struct rdma_umap_priv, list); |
|
mm = priv->vma->vm_mm; |
|
ret = mmget_not_zero(mm); |
|
if (!ret) { |
|
list_del_init(&priv->list); |
|
if (priv->entry) { |
|
rdma_user_mmap_entry_put(priv->entry); |
|
priv->entry = NULL; |
|
} |
|
mm = NULL; |
|
continue; |
|
} |
|
break; |
|
} |
|
mutex_unlock(&ufile->umap_lock); |
|
if (!mm) |
|
return; |
|
|
|
/* |
|
* The umap_lock is nested under mmap_lock since it used within |
|
* the vma_ops callbacks, so we have to clean the list one mm |
|
* at a time to get the lock ordering right. Typically there |
|
* will only be one mm, so no big deal. |
|
*/ |
|
mmap_read_lock(mm); |
|
mutex_lock(&ufile->umap_lock); |
|
list_for_each_entry_safe (priv, next_priv, &ufile->umaps, |
|
list) { |
|
struct vm_area_struct *vma = priv->vma; |
|
|
|
if (vma->vm_mm != mm) |
|
continue; |
|
list_del_init(&priv->list); |
|
|
|
zap_vma_ptes(vma, vma->vm_start, |
|
vma->vm_end - vma->vm_start); |
|
|
|
if (priv->entry) { |
|
rdma_user_mmap_entry_put(priv->entry); |
|
priv->entry = NULL; |
|
} |
|
} |
|
mutex_unlock(&ufile->umap_lock); |
|
mmap_read_unlock(mm); |
|
mmput(mm); |
|
} |
|
} |
|
|
|
/* |
|
* ib_uverbs_open() does not need the BKL: |
|
* |
|
* - the ib_uverbs_device structures are properly reference counted and |
|
* everything else is purely local to the file being created, so |
|
* races against other open calls are not a problem; |
|
* - there is no ioctl method to race against; |
|
* - the open method will either immediately run -ENXIO, or all |
|
* required initialization will be done. |
|
*/ |
|
static int ib_uverbs_open(struct inode *inode, struct file *filp) |
|
{ |
|
struct ib_uverbs_device *dev; |
|
struct ib_uverbs_file *file; |
|
struct ib_device *ib_dev; |
|
int ret; |
|
int module_dependent; |
|
int srcu_key; |
|
|
|
dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev); |
|
if (!atomic_inc_not_zero(&dev->refcount)) |
|
return -ENXIO; |
|
|
|
get_device(&dev->dev); |
|
srcu_key = srcu_read_lock(&dev->disassociate_srcu); |
|
mutex_lock(&dev->lists_mutex); |
|
ib_dev = srcu_dereference(dev->ib_dev, |
|
&dev->disassociate_srcu); |
|
if (!ib_dev) { |
|
ret = -EIO; |
|
goto err; |
|
} |
|
|
|
if (!rdma_dev_access_netns(ib_dev, current->nsproxy->net_ns)) { |
|
ret = -EPERM; |
|
goto err; |
|
} |
|
|
|
/* In case IB device supports disassociate ucontext, there is no hard |
|
* dependency between uverbs device and its low level device. |
|
*/ |
|
module_dependent = !(ib_dev->ops.disassociate_ucontext); |
|
|
|
if (module_dependent) { |
|
if (!try_module_get(ib_dev->ops.owner)) { |
|
ret = -ENODEV; |
|
goto err; |
|
} |
|
} |
|
|
|
file = kzalloc(sizeof(*file), GFP_KERNEL); |
|
if (!file) { |
|
ret = -ENOMEM; |
|
if (module_dependent) |
|
goto err_module; |
|
|
|
goto err; |
|
} |
|
|
|
file->device = dev; |
|
kref_init(&file->ref); |
|
mutex_init(&file->ucontext_lock); |
|
|
|
spin_lock_init(&file->uobjects_lock); |
|
INIT_LIST_HEAD(&file->uobjects); |
|
init_rwsem(&file->hw_destroy_rwsem); |
|
mutex_init(&file->umap_lock); |
|
INIT_LIST_HEAD(&file->umaps); |
|
|
|
filp->private_data = file; |
|
list_add_tail(&file->list, &dev->uverbs_file_list); |
|
mutex_unlock(&dev->lists_mutex); |
|
srcu_read_unlock(&dev->disassociate_srcu, srcu_key); |
|
|
|
setup_ufile_idr_uobject(file); |
|
|
|
return stream_open(inode, filp); |
|
|
|
err_module: |
|
module_put(ib_dev->ops.owner); |
|
|
|
err: |
|
mutex_unlock(&dev->lists_mutex); |
|
srcu_read_unlock(&dev->disassociate_srcu, srcu_key); |
|
if (atomic_dec_and_test(&dev->refcount)) |
|
ib_uverbs_comp_dev(dev); |
|
|
|
put_device(&dev->dev); |
|
return ret; |
|
} |
|
|
|
static int ib_uverbs_close(struct inode *inode, struct file *filp) |
|
{ |
|
struct ib_uverbs_file *file = filp->private_data; |
|
|
|
uverbs_destroy_ufile_hw(file, RDMA_REMOVE_CLOSE); |
|
|
|
mutex_lock(&file->device->lists_mutex); |
|
list_del_init(&file->list); |
|
mutex_unlock(&file->device->lists_mutex); |
|
|
|
kref_put(&file->ref, ib_uverbs_release_file); |
|
|
|
return 0; |
|
} |
|
|
|
static const struct file_operations uverbs_fops = { |
|
.owner = THIS_MODULE, |
|
.write = ib_uverbs_write, |
|
.open = ib_uverbs_open, |
|
.release = ib_uverbs_close, |
|
.llseek = no_llseek, |
|
.unlocked_ioctl = ib_uverbs_ioctl, |
|
.compat_ioctl = compat_ptr_ioctl, |
|
}; |
|
|
|
static const struct file_operations uverbs_mmap_fops = { |
|
.owner = THIS_MODULE, |
|
.write = ib_uverbs_write, |
|
.mmap = ib_uverbs_mmap, |
|
.open = ib_uverbs_open, |
|
.release = ib_uverbs_close, |
|
.llseek = no_llseek, |
|
.unlocked_ioctl = ib_uverbs_ioctl, |
|
.compat_ioctl = compat_ptr_ioctl, |
|
}; |
|
|
|
static int ib_uverbs_get_nl_info(struct ib_device *ibdev, void *client_data, |
|
struct ib_client_nl_info *res) |
|
{ |
|
struct ib_uverbs_device *uverbs_dev = client_data; |
|
int ret; |
|
|
|
if (res->port != -1) |
|
return -EINVAL; |
|
|
|
res->abi = ibdev->ops.uverbs_abi_ver; |
|
res->cdev = &uverbs_dev->dev; |
|
|
|
/* |
|
* To support DRIVER_ID binding in userspace some of the driver need |
|
* upgrading to expose their PCI dependent revision information |
|
* through get_context instead of relying on modalias matching. When |
|
* the drivers are fixed they can drop this flag. |
|
*/ |
|
if (!ibdev->ops.uverbs_no_driver_id_binding) { |
|
ret = nla_put_u32(res->nl_msg, RDMA_NLDEV_ATTR_UVERBS_DRIVER_ID, |
|
ibdev->ops.driver_id); |
|
if (ret) |
|
return ret; |
|
} |
|
return 0; |
|
} |
|
|
|
static struct ib_client uverbs_client = { |
|
.name = "uverbs", |
|
.no_kverbs_req = true, |
|
.add = ib_uverbs_add_one, |
|
.remove = ib_uverbs_remove_one, |
|
.get_nl_info = ib_uverbs_get_nl_info, |
|
}; |
|
MODULE_ALIAS_RDMA_CLIENT("uverbs"); |
|
|
|
static ssize_t ibdev_show(struct device *device, struct device_attribute *attr, |
|
char *buf) |
|
{ |
|
struct ib_uverbs_device *dev = |
|
container_of(device, struct ib_uverbs_device, dev); |
|
int ret = -ENODEV; |
|
int srcu_key; |
|
struct ib_device *ib_dev; |
|
|
|
srcu_key = srcu_read_lock(&dev->disassociate_srcu); |
|
ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu); |
|
if (ib_dev) |
|
ret = sysfs_emit(buf, "%s\n", dev_name(&ib_dev->dev)); |
|
srcu_read_unlock(&dev->disassociate_srcu, srcu_key); |
|
|
|
return ret; |
|
} |
|
static DEVICE_ATTR_RO(ibdev); |
|
|
|
static ssize_t abi_version_show(struct device *device, |
|
struct device_attribute *attr, char *buf) |
|
{ |
|
struct ib_uverbs_device *dev = |
|
container_of(device, struct ib_uverbs_device, dev); |
|
int ret = -ENODEV; |
|
int srcu_key; |
|
struct ib_device *ib_dev; |
|
|
|
srcu_key = srcu_read_lock(&dev->disassociate_srcu); |
|
ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu); |
|
if (ib_dev) |
|
ret = sysfs_emit(buf, "%u\n", ib_dev->ops.uverbs_abi_ver); |
|
srcu_read_unlock(&dev->disassociate_srcu, srcu_key); |
|
|
|
return ret; |
|
} |
|
static DEVICE_ATTR_RO(abi_version); |
|
|
|
static struct attribute *ib_dev_attrs[] = { |
|
&dev_attr_abi_version.attr, |
|
&dev_attr_ibdev.attr, |
|
NULL, |
|
}; |
|
|
|
static const struct attribute_group dev_attr_group = { |
|
.attrs = ib_dev_attrs, |
|
}; |
|
|
|
static CLASS_ATTR_STRING(abi_version, S_IRUGO, |
|
__stringify(IB_USER_VERBS_ABI_VERSION)); |
|
|
|
static int ib_uverbs_create_uapi(struct ib_device *device, |
|
struct ib_uverbs_device *uverbs_dev) |
|
{ |
|
struct uverbs_api *uapi; |
|
|
|
uapi = uverbs_alloc_api(device); |
|
if (IS_ERR(uapi)) |
|
return PTR_ERR(uapi); |
|
|
|
uverbs_dev->uapi = uapi; |
|
return 0; |
|
} |
|
|
|
static int ib_uverbs_add_one(struct ib_device *device) |
|
{ |
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int devnum; |
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dev_t base; |
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struct ib_uverbs_device *uverbs_dev; |
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int ret; |
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|
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if (!device->ops.alloc_ucontext) |
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return -EOPNOTSUPP; |
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|
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uverbs_dev = kzalloc(sizeof(*uverbs_dev), GFP_KERNEL); |
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if (!uverbs_dev) |
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return -ENOMEM; |
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|
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ret = init_srcu_struct(&uverbs_dev->disassociate_srcu); |
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if (ret) { |
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kfree(uverbs_dev); |
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return -ENOMEM; |
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} |
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|
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device_initialize(&uverbs_dev->dev); |
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uverbs_dev->dev.class = uverbs_class; |
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uverbs_dev->dev.parent = device->dev.parent; |
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uverbs_dev->dev.release = ib_uverbs_release_dev; |
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uverbs_dev->groups[0] = &dev_attr_group; |
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uverbs_dev->dev.groups = uverbs_dev->groups; |
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atomic_set(&uverbs_dev->refcount, 1); |
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init_completion(&uverbs_dev->comp); |
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uverbs_dev->xrcd_tree = RB_ROOT; |
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mutex_init(&uverbs_dev->xrcd_tree_mutex); |
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mutex_init(&uverbs_dev->lists_mutex); |
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INIT_LIST_HEAD(&uverbs_dev->uverbs_file_list); |
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rcu_assign_pointer(uverbs_dev->ib_dev, device); |
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uverbs_dev->num_comp_vectors = device->num_comp_vectors; |
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|
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devnum = ida_alloc_max(&uverbs_ida, IB_UVERBS_MAX_DEVICES - 1, |
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GFP_KERNEL); |
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if (devnum < 0) { |
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ret = -ENOMEM; |
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goto err; |
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} |
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uverbs_dev->devnum = devnum; |
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if (devnum >= IB_UVERBS_NUM_FIXED_MINOR) |
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base = dynamic_uverbs_dev + devnum - IB_UVERBS_NUM_FIXED_MINOR; |
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else |
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base = IB_UVERBS_BASE_DEV + devnum; |
|
|
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ret = ib_uverbs_create_uapi(device, uverbs_dev); |
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if (ret) |
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goto err_uapi; |
|
|
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uverbs_dev->dev.devt = base; |
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dev_set_name(&uverbs_dev->dev, "uverbs%d", uverbs_dev->devnum); |
|
|
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cdev_init(&uverbs_dev->cdev, |
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device->ops.mmap ? &uverbs_mmap_fops : &uverbs_fops); |
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uverbs_dev->cdev.owner = THIS_MODULE; |
|
|
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ret = cdev_device_add(&uverbs_dev->cdev, &uverbs_dev->dev); |
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if (ret) |
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goto err_uapi; |
|
|
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ib_set_client_data(device, &uverbs_client, uverbs_dev); |
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return 0; |
|
|
|
err_uapi: |
|
ida_free(&uverbs_ida, devnum); |
|
err: |
|
if (atomic_dec_and_test(&uverbs_dev->refcount)) |
|
ib_uverbs_comp_dev(uverbs_dev); |
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wait_for_completion(&uverbs_dev->comp); |
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put_device(&uverbs_dev->dev); |
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return ret; |
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} |
|
|
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static void ib_uverbs_free_hw_resources(struct ib_uverbs_device *uverbs_dev, |
|
struct ib_device *ib_dev) |
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{ |
|
struct ib_uverbs_file *file; |
|
|
|
/* Pending running commands to terminate */ |
|
uverbs_disassociate_api_pre(uverbs_dev); |
|
|
|
mutex_lock(&uverbs_dev->lists_mutex); |
|
while (!list_empty(&uverbs_dev->uverbs_file_list)) { |
|
file = list_first_entry(&uverbs_dev->uverbs_file_list, |
|
struct ib_uverbs_file, list); |
|
list_del_init(&file->list); |
|
kref_get(&file->ref); |
|
|
|
/* We must release the mutex before going ahead and calling |
|
* uverbs_cleanup_ufile, as it might end up indirectly calling |
|
* uverbs_close, for example due to freeing the resources (e.g |
|
* mmput). |
|
*/ |
|
mutex_unlock(&uverbs_dev->lists_mutex); |
|
|
|
uverbs_destroy_ufile_hw(file, RDMA_REMOVE_DRIVER_REMOVE); |
|
kref_put(&file->ref, ib_uverbs_release_file); |
|
|
|
mutex_lock(&uverbs_dev->lists_mutex); |
|
} |
|
mutex_unlock(&uverbs_dev->lists_mutex); |
|
|
|
uverbs_disassociate_api(uverbs_dev->uapi); |
|
} |
|
|
|
static void ib_uverbs_remove_one(struct ib_device *device, void *client_data) |
|
{ |
|
struct ib_uverbs_device *uverbs_dev = client_data; |
|
int wait_clients = 1; |
|
|
|
cdev_device_del(&uverbs_dev->cdev, &uverbs_dev->dev); |
|
ida_free(&uverbs_ida, uverbs_dev->devnum); |
|
|
|
if (device->ops.disassociate_ucontext) { |
|
/* We disassociate HW resources and immediately return. |
|
* Userspace will see a EIO errno for all future access. |
|
* Upon returning, ib_device may be freed internally and is not |
|
* valid any more. |
|
* uverbs_device is still available until all clients close |
|
* their files, then the uverbs device ref count will be zero |
|
* and its resources will be freed. |
|
* Note: At this point no more files can be opened since the |
|
* cdev was deleted, however active clients can still issue |
|
* commands and close their open files. |
|
*/ |
|
ib_uverbs_free_hw_resources(uverbs_dev, device); |
|
wait_clients = 0; |
|
} |
|
|
|
if (atomic_dec_and_test(&uverbs_dev->refcount)) |
|
ib_uverbs_comp_dev(uverbs_dev); |
|
if (wait_clients) |
|
wait_for_completion(&uverbs_dev->comp); |
|
|
|
put_device(&uverbs_dev->dev); |
|
} |
|
|
|
static char *uverbs_devnode(struct device *dev, umode_t *mode) |
|
{ |
|
if (mode) |
|
*mode = 0666; |
|
return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev)); |
|
} |
|
|
|
static int __init ib_uverbs_init(void) |
|
{ |
|
int ret; |
|
|
|
ret = register_chrdev_region(IB_UVERBS_BASE_DEV, |
|
IB_UVERBS_NUM_FIXED_MINOR, |
|
"infiniband_verbs"); |
|
if (ret) { |
|
pr_err("user_verbs: couldn't register device number\n"); |
|
goto out; |
|
} |
|
|
|
ret = alloc_chrdev_region(&dynamic_uverbs_dev, 0, |
|
IB_UVERBS_NUM_DYNAMIC_MINOR, |
|
"infiniband_verbs"); |
|
if (ret) { |
|
pr_err("couldn't register dynamic device number\n"); |
|
goto out_alloc; |
|
} |
|
|
|
uverbs_class = class_create(THIS_MODULE, "infiniband_verbs"); |
|
if (IS_ERR(uverbs_class)) { |
|
ret = PTR_ERR(uverbs_class); |
|
pr_err("user_verbs: couldn't create class infiniband_verbs\n"); |
|
goto out_chrdev; |
|
} |
|
|
|
uverbs_class->devnode = uverbs_devnode; |
|
|
|
ret = class_create_file(uverbs_class, &class_attr_abi_version.attr); |
|
if (ret) { |
|
pr_err("user_verbs: couldn't create abi_version attribute\n"); |
|
goto out_class; |
|
} |
|
|
|
ret = ib_register_client(&uverbs_client); |
|
if (ret) { |
|
pr_err("user_verbs: couldn't register client\n"); |
|
goto out_class; |
|
} |
|
|
|
return 0; |
|
|
|
out_class: |
|
class_destroy(uverbs_class); |
|
|
|
out_chrdev: |
|
unregister_chrdev_region(dynamic_uverbs_dev, |
|
IB_UVERBS_NUM_DYNAMIC_MINOR); |
|
|
|
out_alloc: |
|
unregister_chrdev_region(IB_UVERBS_BASE_DEV, |
|
IB_UVERBS_NUM_FIXED_MINOR); |
|
|
|
out: |
|
return ret; |
|
} |
|
|
|
static void __exit ib_uverbs_cleanup(void) |
|
{ |
|
ib_unregister_client(&uverbs_client); |
|
class_destroy(uverbs_class); |
|
unregister_chrdev_region(IB_UVERBS_BASE_DEV, |
|
IB_UVERBS_NUM_FIXED_MINOR); |
|
unregister_chrdev_region(dynamic_uverbs_dev, |
|
IB_UVERBS_NUM_DYNAMIC_MINOR); |
|
mmu_notifier_synchronize(); |
|
} |
|
|
|
module_init(ib_uverbs_init); |
|
module_exit(ib_uverbs_cleanup);
|
|
|