![Ariel Levkovich](/assets/img/avatar_default.png)
This change adds uverbs support for allocation/freeing of device memory commands. A new uverbs object is defined of type idr to represent and track the new resource type allocation per context. The API requires provider driver to implement 2 new ib_device callbacks - one for allocation and one for deallocation which return and accept (respectively) the ib_dm object which represents the allocated memory on the device. The support is added via the ioctl command infrastructure only. Signed-off-by: Ariel Levkovich <lariel@mellanox.com> Signed-off-by: Leon Romanovsky <leonro@mellanox.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
109 lines
3.5 KiB
C
109 lines
3.5 KiB
C
/*
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* Copyright (c) 2018, Mellanox Technologies 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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#include "uverbs.h"
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#include <rdma/uverbs_std_types.h>
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static int uverbs_free_dm(struct ib_uobject *uobject,
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enum rdma_remove_reason why)
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{
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struct ib_dm *dm = uobject->object;
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if (why == RDMA_REMOVE_DESTROY && atomic_read(&dm->usecnt))
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return -EBUSY;
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return dm->device->dealloc_dm(dm);
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}
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static int UVERBS_HANDLER(UVERBS_METHOD_DM_ALLOC)(struct ib_device *ib_dev,
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struct ib_uverbs_file *file,
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struct uverbs_attr_bundle *attrs)
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{
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struct ib_ucontext *ucontext = file->ucontext;
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struct ib_dm_alloc_attr attr = {};
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struct ib_uobject *uobj;
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struct ib_dm *dm;
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int ret;
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if (!ib_dev->alloc_dm)
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return -EOPNOTSUPP;
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ret = uverbs_copy_from(&attr.length, attrs,
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UVERBS_ATTR_ALLOC_DM_LENGTH);
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if (ret)
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return ret;
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ret = uverbs_copy_from(&attr.alignment, attrs,
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UVERBS_ATTR_ALLOC_DM_ALIGNMENT);
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if (ret)
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return ret;
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uobj = uverbs_attr_get(attrs, UVERBS_ATTR_ALLOC_DM_HANDLE)->obj_attr.uobject;
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dm = ib_dev->alloc_dm(ib_dev, ucontext, &attr, attrs);
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if (IS_ERR(dm))
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return PTR_ERR(dm);
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dm->device = ib_dev;
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dm->length = attr.length;
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dm->uobject = uobj;
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atomic_set(&dm->usecnt, 0);
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uobj->object = dm;
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return 0;
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}
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static DECLARE_UVERBS_NAMED_METHOD(UVERBS_METHOD_DM_ALLOC,
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&UVERBS_ATTR_IDR(UVERBS_ATTR_ALLOC_DM_HANDLE, UVERBS_OBJECT_DM,
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UVERBS_ACCESS_NEW,
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UA_FLAGS(UVERBS_ATTR_SPEC_F_MANDATORY)),
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&UVERBS_ATTR_PTR_IN(UVERBS_ATTR_ALLOC_DM_LENGTH,
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UVERBS_ATTR_TYPE(u64),
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UA_FLAGS(UVERBS_ATTR_SPEC_F_MANDATORY)),
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&UVERBS_ATTR_PTR_IN(UVERBS_ATTR_ALLOC_DM_ALIGNMENT,
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UVERBS_ATTR_TYPE(u32),
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UA_FLAGS(UVERBS_ATTR_SPEC_F_MANDATORY)));
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static DECLARE_UVERBS_NAMED_METHOD_WITH_HANDLER(UVERBS_METHOD_DM_FREE,
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uverbs_destroy_def_handler,
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&UVERBS_ATTR_IDR(UVERBS_ATTR_FREE_DM_HANDLE,
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UVERBS_OBJECT_DM,
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UVERBS_ACCESS_DESTROY,
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UA_FLAGS(UVERBS_ATTR_SPEC_F_MANDATORY)));
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DECLARE_UVERBS_NAMED_OBJECT(UVERBS_OBJECT_DM,
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/* 1 is used in order to free the DM after MRs */
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&UVERBS_TYPE_ALLOC_IDR(1, uverbs_free_dm),
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&UVERBS_METHOD(UVERBS_METHOD_DM_ALLOC),
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&UVERBS_METHOD(UVERBS_METHOD_DM_FREE));
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