1 /* 2 * Copyright (c) 2018, Mellanox Technologies inc. All rights reserved. 3 * 4 * This software is available to you under a choice of one of two 5 * licenses. You may choose to be licensed under the terms of the GNU 6 * General Public License (GPL) Version 2, available from the file 7 * COPYING in the main directory of this source tree, or the 8 * OpenIB.org BSD license below: 9 * 10 * Redistribution and use in source and binary forms, with or 11 * without modification, are permitted provided that the following 12 * conditions are met: 13 * 14 * - Redistributions of source code must retain the above 15 * copyright notice, this list of conditions and the following 16 * disclaimer. 17 * 18 * - Redistributions in binary form must reproduce the above 19 * copyright notice, this list of conditions and the following 20 * disclaimer in the documentation and/or other materials 21 * provided with the distribution. 22 * 23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 30 * SOFTWARE. 31 */ 32 33 #include "uverbs.h" 34 #include <rdma/uverbs_std_types.h> 35 36 static int uverbs_free_dm(struct ib_uobject *uobject, 37 enum rdma_remove_reason why) 38 { 39 struct ib_dm *dm = uobject->object; 40 41 if (why == RDMA_REMOVE_DESTROY && atomic_read(&dm->usecnt)) 42 return -EBUSY; 43 44 return dm->device->dealloc_dm(dm); 45 } 46 47 static int UVERBS_HANDLER(UVERBS_METHOD_DM_ALLOC)(struct ib_device *ib_dev, 48 struct ib_uverbs_file *file, 49 struct uverbs_attr_bundle *attrs) 50 { 51 struct ib_ucontext *ucontext = file->ucontext; 52 struct ib_dm_alloc_attr attr = {}; 53 struct ib_uobject *uobj; 54 struct ib_dm *dm; 55 int ret; 56 57 if (!ib_dev->alloc_dm) 58 return -EOPNOTSUPP; 59 60 ret = uverbs_copy_from(&attr.length, attrs, 61 UVERBS_ATTR_ALLOC_DM_LENGTH); 62 if (ret) 63 return ret; 64 65 ret = uverbs_copy_from(&attr.alignment, attrs, 66 UVERBS_ATTR_ALLOC_DM_ALIGNMENT); 67 if (ret) 68 return ret; 69 70 uobj = uverbs_attr_get(attrs, UVERBS_ATTR_ALLOC_DM_HANDLE)->obj_attr.uobject; 71 72 dm = ib_dev->alloc_dm(ib_dev, ucontext, &attr, attrs); 73 if (IS_ERR(dm)) 74 return PTR_ERR(dm); 75 76 dm->device = ib_dev; 77 dm->length = attr.length; 78 dm->uobject = uobj; 79 atomic_set(&dm->usecnt, 0); 80 81 uobj->object = dm; 82 83 return 0; 84 } 85 86 static DECLARE_UVERBS_NAMED_METHOD(UVERBS_METHOD_DM_ALLOC, 87 &UVERBS_ATTR_IDR(UVERBS_ATTR_ALLOC_DM_HANDLE, UVERBS_OBJECT_DM, 88 UVERBS_ACCESS_NEW, 89 UA_FLAGS(UVERBS_ATTR_SPEC_F_MANDATORY)), 90 &UVERBS_ATTR_PTR_IN(UVERBS_ATTR_ALLOC_DM_LENGTH, 91 UVERBS_ATTR_TYPE(u64), 92 UA_FLAGS(UVERBS_ATTR_SPEC_F_MANDATORY)), 93 &UVERBS_ATTR_PTR_IN(UVERBS_ATTR_ALLOC_DM_ALIGNMENT, 94 UVERBS_ATTR_TYPE(u32), 95 UA_FLAGS(UVERBS_ATTR_SPEC_F_MANDATORY))); 96 97 static DECLARE_UVERBS_NAMED_METHOD_WITH_HANDLER(UVERBS_METHOD_DM_FREE, 98 uverbs_destroy_def_handler, 99 &UVERBS_ATTR_IDR(UVERBS_ATTR_FREE_DM_HANDLE, 100 UVERBS_OBJECT_DM, 101 UVERBS_ACCESS_DESTROY, 102 UA_FLAGS(UVERBS_ATTR_SPEC_F_MANDATORY))); 103 104 DECLARE_UVERBS_NAMED_OBJECT(UVERBS_OBJECT_DM, 105 /* 1 is used in order to free the DM after MRs */ 106 &UVERBS_TYPE_ALLOC_IDR(1, uverbs_free_dm), 107 &UVERBS_METHOD(UVERBS_METHOD_DM_ALLOC), 108 &UVERBS_METHOD(UVERBS_METHOD_DM_FREE)); 109