1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2022, Microsoft Corporation. All rights reserved. 4 */ 5 6 #include "mana_ib.h" 7 8 #define VALID_MR_FLAGS \ 9 (IB_ACCESS_LOCAL_WRITE | IB_ACCESS_REMOTE_WRITE | IB_ACCESS_REMOTE_READ) 10 11 static enum gdma_mr_access_flags 12 mana_ib_verbs_to_gdma_access_flags(int access_flags) 13 { 14 enum gdma_mr_access_flags flags = GDMA_ACCESS_FLAG_LOCAL_READ; 15 16 if (access_flags & IB_ACCESS_LOCAL_WRITE) 17 flags |= GDMA_ACCESS_FLAG_LOCAL_WRITE; 18 19 if (access_flags & IB_ACCESS_REMOTE_WRITE) 20 flags |= GDMA_ACCESS_FLAG_REMOTE_WRITE; 21 22 if (access_flags & IB_ACCESS_REMOTE_READ) 23 flags |= GDMA_ACCESS_FLAG_REMOTE_READ; 24 25 return flags; 26 } 27 28 static int mana_ib_gd_create_mr(struct mana_ib_dev *dev, struct mana_ib_mr *mr, 29 struct gdma_create_mr_params *mr_params) 30 { 31 struct gdma_create_mr_response resp = {}; 32 struct gdma_create_mr_request req = {}; 33 struct gdma_context *gc = mdev_to_gc(dev); 34 int err; 35 36 mana_gd_init_req_hdr(&req.hdr, GDMA_CREATE_MR, sizeof(req), 37 sizeof(resp)); 38 req.pd_handle = mr_params->pd_handle; 39 req.mr_type = mr_params->mr_type; 40 41 switch (mr_params->mr_type) { 42 case GDMA_MR_TYPE_GVA: 43 req.gva.dma_region_handle = mr_params->gva.dma_region_handle; 44 req.gva.virtual_address = mr_params->gva.virtual_address; 45 req.gva.access_flags = mr_params->gva.access_flags; 46 break; 47 48 default: 49 ibdev_dbg(&dev->ib_dev, 50 "invalid param (GDMA_MR_TYPE) passed, type %d\n", 51 req.mr_type); 52 return -EINVAL; 53 } 54 55 err = mana_gd_send_request(gc, sizeof(req), &req, sizeof(resp), &resp); 56 57 if (err || resp.hdr.status) { 58 ibdev_dbg(&dev->ib_dev, "Failed to create mr %d, %u", err, 59 resp.hdr.status); 60 if (!err) 61 err = -EPROTO; 62 63 return err; 64 } 65 66 mr->ibmr.lkey = resp.lkey; 67 mr->ibmr.rkey = resp.rkey; 68 mr->mr_handle = resp.mr_handle; 69 70 return 0; 71 } 72 73 static int mana_ib_gd_destroy_mr(struct mana_ib_dev *dev, u64 mr_handle) 74 { 75 struct gdma_destroy_mr_response resp = {}; 76 struct gdma_destroy_mr_request req = {}; 77 struct gdma_context *gc = mdev_to_gc(dev); 78 int err; 79 80 mana_gd_init_req_hdr(&req.hdr, GDMA_DESTROY_MR, sizeof(req), 81 sizeof(resp)); 82 83 req.mr_handle = mr_handle; 84 85 err = mana_gd_send_request(gc, sizeof(req), &req, sizeof(resp), &resp); 86 if (err || resp.hdr.status) { 87 dev_err(gc->dev, "Failed to destroy MR: %d, 0x%x\n", err, 88 resp.hdr.status); 89 if (!err) 90 err = -EPROTO; 91 return err; 92 } 93 94 return 0; 95 } 96 97 struct ib_mr *mana_ib_reg_user_mr(struct ib_pd *ibpd, u64 start, u64 length, 98 u64 iova, int access_flags, 99 struct ib_udata *udata) 100 { 101 struct mana_ib_pd *pd = container_of(ibpd, struct mana_ib_pd, ibpd); 102 struct gdma_create_mr_params mr_params = {}; 103 struct ib_device *ibdev = ibpd->device; 104 struct mana_ib_dev *dev; 105 struct mana_ib_mr *mr; 106 u64 dma_region_handle; 107 int err; 108 109 dev = container_of(ibdev, struct mana_ib_dev, ib_dev); 110 111 ibdev_dbg(ibdev, 112 "start 0x%llx, iova 0x%llx length 0x%llx access_flags 0x%x", 113 start, iova, length, access_flags); 114 115 if (access_flags & ~VALID_MR_FLAGS) 116 return ERR_PTR(-EINVAL); 117 118 mr = kzalloc(sizeof(*mr), GFP_KERNEL); 119 if (!mr) 120 return ERR_PTR(-ENOMEM); 121 122 mr->umem = ib_umem_get(ibdev, start, length, access_flags); 123 if (IS_ERR(mr->umem)) { 124 err = PTR_ERR(mr->umem); 125 ibdev_dbg(ibdev, 126 "Failed to get umem for register user-mr, %d\n", err); 127 goto err_free; 128 } 129 130 err = mana_ib_create_dma_region(dev, mr->umem, &dma_region_handle, iova); 131 if (err) { 132 ibdev_dbg(ibdev, "Failed create dma region for user-mr, %d\n", 133 err); 134 goto err_umem; 135 } 136 137 ibdev_dbg(ibdev, 138 "create_dma_region ret %d gdma_region %llx\n", err, 139 dma_region_handle); 140 141 mr_params.pd_handle = pd->pd_handle; 142 mr_params.mr_type = GDMA_MR_TYPE_GVA; 143 mr_params.gva.dma_region_handle = dma_region_handle; 144 mr_params.gva.virtual_address = iova; 145 mr_params.gva.access_flags = 146 mana_ib_verbs_to_gdma_access_flags(access_flags); 147 148 err = mana_ib_gd_create_mr(dev, mr, &mr_params); 149 if (err) 150 goto err_dma_region; 151 152 /* 153 * There is no need to keep track of dma_region_handle after MR is 154 * successfully created. The dma_region_handle is tracked in the PF 155 * as part of the lifecycle of this MR. 156 */ 157 158 return &mr->ibmr; 159 160 err_dma_region: 161 mana_gd_destroy_dma_region(mdev_to_gc(dev), dma_region_handle); 162 163 err_umem: 164 ib_umem_release(mr->umem); 165 166 err_free: 167 kfree(mr); 168 return ERR_PTR(err); 169 } 170 171 int mana_ib_dereg_mr(struct ib_mr *ibmr, struct ib_udata *udata) 172 { 173 struct mana_ib_mr *mr = container_of(ibmr, struct mana_ib_mr, ibmr); 174 struct ib_device *ibdev = ibmr->device; 175 struct mana_ib_dev *dev; 176 int err; 177 178 dev = container_of(ibdev, struct mana_ib_dev, ib_dev); 179 180 err = mana_ib_gd_destroy_mr(dev, mr->mr_handle); 181 if (err) 182 return err; 183 184 if (mr->umem) 185 ib_umem_release(mr->umem); 186 187 kfree(mr); 188 189 return 0; 190 } 191