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The completion channel we use in verbs infrastructure is FD based. Previously, we had a separate way to manage this object. Since we strive for a single way to manage any kind of object in this infrastructure, we conceptually treat all objects as subclasses of ib_uobject. This commit adds the necessary mechanism to support FD based objects like their IDR counterparts. FD objects release need to be synchronized with context release. We use the cleanup_mutex on the uverbs_file for that. Signed-off-by: Matan Barak <matanb@mellanox.com> Reviewed-by: Yishai Hadas <yishaih@mellanox.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
79 lines
3.2 KiB
C
79 lines
3.2 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) 2005-2017 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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#ifndef RDMA_CORE_H
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#define RDMA_CORE_H
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#include <linux/idr.h>
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#include <rdma/uverbs_types.h>
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#include <rdma/ib_verbs.h>
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#include <linux/mutex.h>
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/*
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* These functions initialize the context and cleanups its uobjects.
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* The context has a list of objects which is protected by a mutex
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* on the context. initialize_ucontext should be called when we create
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* a context.
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* cleanup_ucontext removes all uobjects from the context and puts them.
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*/
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void uverbs_cleanup_ucontext(struct ib_ucontext *ucontext, bool device_removed);
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void uverbs_initialize_ucontext(struct ib_ucontext *ucontext);
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/*
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* uverbs_uobject_get is called in order to increase the reference count on
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* an uobject. This is useful when a handler wants to keep the uobject's memory
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* alive, regardless if this uobject is still alive in the context's objects
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* repository. Objects are put via uverbs_uobject_put.
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*/
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void uverbs_uobject_get(struct ib_uobject *uobject);
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/*
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* In order to indicate we no longer needs this uobject, uverbs_uobject_put
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* is called. When the reference count is decreased, the uobject is freed.
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* For example, this is used when attaching a completion channel to a CQ.
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*/
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void uverbs_uobject_put(struct ib_uobject *uobject);
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/* Indicate this fd is no longer used by this consumer, but its memory isn't
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* necessarily released yet. When the last reference is put, we release the
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* memory. After this call is executed, calling uverbs_uobject_get isn't
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* allowed.
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* This must be called from the release file_operations of the file!
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*/
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void uverbs_close_fd(struct file *f);
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#endif /* RDMA_CORE_H */
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