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7452a3c745
After all the recent structural changes this is now straightfoward, hoist the hw_destroy_rwsem up out of rdma_destroy_explicit and wrap it around the uobject write lock as well as the destroy. This is necessary as obtaining a write lock concurrently with uverbs_destroy_ufile_hw() will cause malfunction. After this change none of the destroy callbacks require the disassociate_srcu lock to be correct. This requires introducing a new lookup mode, UVERBS_LOOKUP_DESTROY as the IOCTL interface needs to hold an unlocked kref until all command verification is completed. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
114 lines
4.7 KiB
C
114 lines
4.7 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/uverbs_ioctl.h>
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#include <rdma/ib_verbs.h>
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#include <linux/mutex.h>
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int uverbs_ns_idx(u16 *id, unsigned int ns_count);
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const struct uverbs_object_spec *uverbs_get_object(struct ib_uverbs_file *ufile,
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uint16_t object);
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const struct uverbs_method_spec *uverbs_get_method(const struct uverbs_object_spec *object,
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uint16_t method);
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void uverbs_destroy_ufile_hw(struct ib_uverbs_file *ufile,
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enum rdma_remove_reason reason);
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int uobj_destroy(struct ib_uobject *uobj);
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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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/*
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* Get an ib_uobject that corresponds to the given id from ufile, assuming
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* the object is from the given type. Lock it to the required access when
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* applicable.
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* This function could create (access == NEW), destroy (access == DESTROY)
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* or unlock (access == READ || access == WRITE) objects if required.
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* The action will be finalized only when uverbs_finalize_object or
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* uverbs_finalize_objects are called.
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*/
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struct ib_uobject *
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uverbs_get_uobject_from_file(const struct uverbs_obj_type *type_attrs,
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struct ib_uverbs_file *ufile,
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enum uverbs_obj_access access, s64 id);
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/*
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* Note that certain finalize stages could return a status:
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* (a) alloc_commit could return a failure if the object is committed at the
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* same time when the context is destroyed.
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* (b) remove_commit could fail if the object wasn't destroyed successfully.
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* Since multiple objects could be finalized in one transaction, it is very NOT
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* recommended to have several finalize actions which have side effects.
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* For example, it's NOT recommended to have a certain action which has both
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* a commit action and a destroy action or two destroy objects in the same
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* action. The rule of thumb is to have one destroy or commit action with
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* multiple lookups.
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* The first non zero return value of finalize_object is returned from this
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* function. For example, this could happen when we couldn't destroy an
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* object.
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*/
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int uverbs_finalize_object(struct ib_uobject *uobj,
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enum uverbs_obj_access access,
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bool commit);
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#endif /* RDMA_CORE_H */
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