fd60ae404f
Wait until all users have closed their device context before allowing device unregistration to complete. This prevents a crash caused by referring to stale data structures. A better solution would be to have a way to revoke contexts rather than waiting for userspace to close the context, but that's a much bigger change that will have to wait. For now let's at least avoid the crash. Signed-off-by: Jack Morgenstein <jackm@mellanox.co.il> Signed-off-by: Michael S. Tsirkin <mst@mellanox.co.il> Signed-off-by: Roland Dreier <rolandd@cisco.com>
205 lines
6.8 KiB
C
205 lines
6.8 KiB
C
/*
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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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* $Id: uverbs.h 2559 2005-06-06 19:43:16Z roland $
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*/
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#ifndef UVERBS_H
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#define UVERBS_H
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#include <linux/kref.h>
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#include <linux/idr.h>
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#include <linux/mutex.h>
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#include <linux/completion.h>
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#include <rdma/ib_verbs.h>
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#include <rdma/ib_user_verbs.h>
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/*
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* Our lifetime rules for these structs are the following:
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*
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* struct ib_uverbs_device: One reference is held by the module and
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* released in ib_uverbs_remove_one(). Another reference is taken by
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* ib_uverbs_open() each time the character special file is opened,
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* and released in ib_uverbs_release_file() when the file is released.
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*
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* struct ib_uverbs_file: One reference is held by the VFS and
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* released when the file is closed. Another reference is taken when
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* an asynchronous event queue file is created and released when the
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* event file is closed.
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*
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* struct ib_uverbs_event_file: One reference is held by the VFS and
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* released when the file is closed. For asynchronous event files,
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* another reference is held by the corresponding main context file
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* and released when that file is closed. For completion event files,
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* a reference is taken when a CQ is created that uses the file, and
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* released when the CQ is destroyed.
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*/
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struct ib_uverbs_device {
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struct kref ref;
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struct completion comp;
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int devnum;
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struct cdev *dev;
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struct class_device *class_dev;
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struct ib_device *ib_dev;
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int num_comp_vectors;
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};
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struct ib_uverbs_event_file {
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struct kref ref;
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struct file *file;
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struct ib_uverbs_file *uverbs_file;
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spinlock_t lock;
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int is_async;
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wait_queue_head_t poll_wait;
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struct fasync_struct *async_queue;
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struct list_head event_list;
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};
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struct ib_uverbs_file {
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struct kref ref;
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struct mutex mutex;
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struct ib_uverbs_device *device;
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struct ib_ucontext *ucontext;
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struct ib_event_handler event_handler;
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struct ib_uverbs_event_file *async_file;
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};
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struct ib_uverbs_event {
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union {
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struct ib_uverbs_async_event_desc async;
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struct ib_uverbs_comp_event_desc comp;
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} desc;
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struct list_head list;
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struct list_head obj_list;
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u32 *counter;
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};
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struct ib_uverbs_mcast_entry {
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struct list_head list;
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union ib_gid gid;
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u16 lid;
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};
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struct ib_uevent_object {
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struct ib_uobject uobject;
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struct list_head event_list;
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u32 events_reported;
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};
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struct ib_uqp_object {
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struct ib_uevent_object uevent;
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struct list_head mcast_list;
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};
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struct ib_ucq_object {
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struct ib_uobject uobject;
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struct ib_uverbs_file *uverbs_file;
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struct list_head comp_list;
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struct list_head async_list;
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u32 comp_events_reported;
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u32 async_events_reported;
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};
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extern spinlock_t ib_uverbs_idr_lock;
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extern struct idr ib_uverbs_pd_idr;
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extern struct idr ib_uverbs_mr_idr;
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extern struct idr ib_uverbs_mw_idr;
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extern struct idr ib_uverbs_ah_idr;
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extern struct idr ib_uverbs_cq_idr;
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extern struct idr ib_uverbs_qp_idr;
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extern struct idr ib_uverbs_srq_idr;
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void idr_remove_uobj(struct idr *idp, struct ib_uobject *uobj);
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struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file,
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int is_async, int *fd);
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void ib_uverbs_release_event_file(struct kref *ref);
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struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd);
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void ib_uverbs_release_ucq(struct ib_uverbs_file *file,
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struct ib_uverbs_event_file *ev_file,
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struct ib_ucq_object *uobj);
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void ib_uverbs_release_uevent(struct ib_uverbs_file *file,
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struct ib_uevent_object *uobj);
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void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context);
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void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr);
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void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr);
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void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr);
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void ib_uverbs_event_handler(struct ib_event_handler *handler,
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struct ib_event *event);
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int ib_umem_get(struct ib_device *dev, struct ib_umem *mem,
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void *addr, size_t size, int write);
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void ib_umem_release(struct ib_device *dev, struct ib_umem *umem);
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void ib_umem_release_on_close(struct ib_device *dev, struct ib_umem *umem);
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#define IB_UVERBS_DECLARE_CMD(name) \
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ssize_t ib_uverbs_##name(struct ib_uverbs_file *file, \
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const char __user *buf, int in_len, \
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int out_len)
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IB_UVERBS_DECLARE_CMD(get_context);
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IB_UVERBS_DECLARE_CMD(query_device);
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IB_UVERBS_DECLARE_CMD(query_port);
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IB_UVERBS_DECLARE_CMD(alloc_pd);
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IB_UVERBS_DECLARE_CMD(dealloc_pd);
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IB_UVERBS_DECLARE_CMD(reg_mr);
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IB_UVERBS_DECLARE_CMD(dereg_mr);
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IB_UVERBS_DECLARE_CMD(create_comp_channel);
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IB_UVERBS_DECLARE_CMD(create_cq);
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IB_UVERBS_DECLARE_CMD(resize_cq);
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IB_UVERBS_DECLARE_CMD(poll_cq);
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IB_UVERBS_DECLARE_CMD(req_notify_cq);
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IB_UVERBS_DECLARE_CMD(destroy_cq);
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IB_UVERBS_DECLARE_CMD(create_qp);
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IB_UVERBS_DECLARE_CMD(query_qp);
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IB_UVERBS_DECLARE_CMD(modify_qp);
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IB_UVERBS_DECLARE_CMD(destroy_qp);
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IB_UVERBS_DECLARE_CMD(post_send);
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IB_UVERBS_DECLARE_CMD(post_recv);
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IB_UVERBS_DECLARE_CMD(post_srq_recv);
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IB_UVERBS_DECLARE_CMD(create_ah);
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IB_UVERBS_DECLARE_CMD(destroy_ah);
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IB_UVERBS_DECLARE_CMD(attach_mcast);
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IB_UVERBS_DECLARE_CMD(detach_mcast);
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IB_UVERBS_DECLARE_CMD(create_srq);
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IB_UVERBS_DECLARE_CMD(modify_srq);
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IB_UVERBS_DECLARE_CMD(query_srq);
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IB_UVERBS_DECLARE_CMD(destroy_srq);
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#endif /* UVERBS_H */
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