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 #define VALID_DMA_MR_FLAGS (IB_ACCESS_LOCAL_WRITE)
12
13 static enum gdma_mr_access_flags
mana_ib_verbs_to_gdma_access_flags(int access_flags)14 mana_ib_verbs_to_gdma_access_flags(int access_flags)
15 {
16 enum gdma_mr_access_flags flags = GDMA_ACCESS_FLAG_LOCAL_READ;
17
18 if (access_flags & IB_ACCESS_LOCAL_WRITE)
19 flags |= GDMA_ACCESS_FLAG_LOCAL_WRITE;
20
21 if (access_flags & IB_ACCESS_REMOTE_WRITE)
22 flags |= GDMA_ACCESS_FLAG_REMOTE_WRITE;
23
24 if (access_flags & IB_ACCESS_REMOTE_READ)
25 flags |= GDMA_ACCESS_FLAG_REMOTE_READ;
26
27 return flags;
28 }
29
mana_ib_gd_create_mr(struct mana_ib_dev * dev,struct mana_ib_mr * mr,struct gdma_create_mr_params * mr_params)30 static int mana_ib_gd_create_mr(struct mana_ib_dev *dev, struct mana_ib_mr *mr,
31 struct gdma_create_mr_params *mr_params)
32 {
33 struct gdma_create_mr_response resp = {};
34 struct gdma_create_mr_request req = {};
35 struct gdma_context *gc = mdev_to_gc(dev);
36 int err;
37
38 mana_gd_init_req_hdr(&req.hdr, GDMA_CREATE_MR, sizeof(req),
39 sizeof(resp));
40 req.pd_handle = mr_params->pd_handle;
41 req.mr_type = mr_params->mr_type;
42
43 switch (mr_params->mr_type) {
44 case GDMA_MR_TYPE_GPA:
45 break;
46 case GDMA_MR_TYPE_GVA:
47 req.gva.dma_region_handle = mr_params->gva.dma_region_handle;
48 req.gva.virtual_address = mr_params->gva.virtual_address;
49 req.gva.access_flags = mr_params->gva.access_flags;
50 break;
51
52 default:
53 ibdev_dbg(&dev->ib_dev,
54 "invalid param (GDMA_MR_TYPE) passed, type %d\n",
55 req.mr_type);
56 return -EINVAL;
57 }
58
59 err = mana_gd_send_request(gc, sizeof(req), &req, sizeof(resp), &resp);
60
61 if (err || resp.hdr.status) {
62 ibdev_dbg(&dev->ib_dev, "Failed to create mr %d, %u", err,
63 resp.hdr.status);
64 if (!err)
65 err = -EPROTO;
66
67 return err;
68 }
69
70 mr->ibmr.lkey = resp.lkey;
71 mr->ibmr.rkey = resp.rkey;
72 mr->mr_handle = resp.mr_handle;
73
74 return 0;
75 }
76
mana_ib_gd_destroy_mr(struct mana_ib_dev * dev,u64 mr_handle)77 static int mana_ib_gd_destroy_mr(struct mana_ib_dev *dev, u64 mr_handle)
78 {
79 struct gdma_destroy_mr_response resp = {};
80 struct gdma_destroy_mr_request req = {};
81 struct gdma_context *gc = mdev_to_gc(dev);
82 int err;
83
84 mana_gd_init_req_hdr(&req.hdr, GDMA_DESTROY_MR, sizeof(req),
85 sizeof(resp));
86
87 req.mr_handle = mr_handle;
88
89 err = mana_gd_send_request(gc, sizeof(req), &req, sizeof(resp), &resp);
90 if (err || resp.hdr.status) {
91 dev_err(gc->dev, "Failed to destroy MR: %d, 0x%x\n", err,
92 resp.hdr.status);
93 if (!err)
94 err = -EPROTO;
95 return err;
96 }
97
98 return 0;
99 }
100
mana_ib_reg_user_mr(struct ib_pd * ibpd,u64 start,u64 length,u64 iova,int access_flags,struct ib_udata * udata)101 struct ib_mr *mana_ib_reg_user_mr(struct ib_pd *ibpd, u64 start, u64 length,
102 u64 iova, int access_flags,
103 struct ib_udata *udata)
104 {
105 struct mana_ib_pd *pd = container_of(ibpd, struct mana_ib_pd, ibpd);
106 struct gdma_create_mr_params mr_params = {};
107 struct ib_device *ibdev = ibpd->device;
108 struct mana_ib_dev *dev;
109 struct mana_ib_mr *mr;
110 u64 dma_region_handle;
111 int err;
112
113 dev = container_of(ibdev, struct mana_ib_dev, ib_dev);
114
115 ibdev_dbg(ibdev,
116 "start 0x%llx, iova 0x%llx length 0x%llx access_flags 0x%x",
117 start, iova, length, access_flags);
118
119 access_flags &= ~IB_ACCESS_OPTIONAL;
120 if (access_flags & ~VALID_MR_FLAGS)
121 return ERR_PTR(-EINVAL);
122
123 mr = kzalloc(sizeof(*mr), GFP_KERNEL);
124 if (!mr)
125 return ERR_PTR(-ENOMEM);
126
127 mr->umem = ib_umem_get(ibdev, start, length, access_flags);
128 if (IS_ERR(mr->umem)) {
129 err = PTR_ERR(mr->umem);
130 ibdev_dbg(ibdev,
131 "Failed to get umem for register user-mr, %d\n", err);
132 goto err_free;
133 }
134
135 err = mana_ib_create_dma_region(dev, mr->umem, &dma_region_handle, iova);
136 if (err) {
137 ibdev_dbg(ibdev, "Failed create dma region for user-mr, %d\n",
138 err);
139 goto err_umem;
140 }
141
142 ibdev_dbg(ibdev,
143 "created dma region for user-mr 0x%llx\n",
144 dma_region_handle);
145
146 mr_params.pd_handle = pd->pd_handle;
147 mr_params.mr_type = GDMA_MR_TYPE_GVA;
148 mr_params.gva.dma_region_handle = dma_region_handle;
149 mr_params.gva.virtual_address = iova;
150 mr_params.gva.access_flags =
151 mana_ib_verbs_to_gdma_access_flags(access_flags);
152
153 err = mana_ib_gd_create_mr(dev, mr, &mr_params);
154 if (err)
155 goto err_dma_region;
156
157 /*
158 * There is no need to keep track of dma_region_handle after MR is
159 * successfully created. The dma_region_handle is tracked in the PF
160 * as part of the lifecycle of this MR.
161 */
162
163 return &mr->ibmr;
164
165 err_dma_region:
166 mana_gd_destroy_dma_region(mdev_to_gc(dev), dma_region_handle);
167
168 err_umem:
169 ib_umem_release(mr->umem);
170
171 err_free:
172 kfree(mr);
173 return ERR_PTR(err);
174 }
175
mana_ib_reg_user_mr_dmabuf(struct ib_pd * ibpd,u64 start,u64 length,u64 iova,int fd,int access_flags,struct uverbs_attr_bundle * attrs)176 struct ib_mr *mana_ib_reg_user_mr_dmabuf(struct ib_pd *ibpd, u64 start, u64 length,
177 u64 iova, int fd, int access_flags,
178 struct uverbs_attr_bundle *attrs)
179 {
180 struct mana_ib_pd *pd = container_of(ibpd, struct mana_ib_pd, ibpd);
181 struct gdma_create_mr_params mr_params = {};
182 struct ib_device *ibdev = ibpd->device;
183 struct ib_umem_dmabuf *umem_dmabuf;
184 struct mana_ib_dev *dev;
185 struct mana_ib_mr *mr;
186 u64 dma_region_handle;
187 int err;
188
189 dev = container_of(ibdev, struct mana_ib_dev, ib_dev);
190
191 access_flags &= ~IB_ACCESS_OPTIONAL;
192 if (access_flags & ~VALID_MR_FLAGS)
193 return ERR_PTR(-EOPNOTSUPP);
194
195 mr = kzalloc(sizeof(*mr), GFP_KERNEL);
196 if (!mr)
197 return ERR_PTR(-ENOMEM);
198
199 umem_dmabuf = ib_umem_dmabuf_get_pinned(ibdev, start, length, fd, access_flags);
200 if (IS_ERR(umem_dmabuf)) {
201 err = PTR_ERR(umem_dmabuf);
202 ibdev_dbg(ibdev, "Failed to get dmabuf umem, %d\n", err);
203 goto err_free;
204 }
205
206 mr->umem = &umem_dmabuf->umem;
207
208 err = mana_ib_create_dma_region(dev, mr->umem, &dma_region_handle, iova);
209 if (err) {
210 ibdev_dbg(ibdev, "Failed create dma region for user-mr, %d\n",
211 err);
212 goto err_umem;
213 }
214
215 mr_params.pd_handle = pd->pd_handle;
216 mr_params.mr_type = GDMA_MR_TYPE_GVA;
217 mr_params.gva.dma_region_handle = dma_region_handle;
218 mr_params.gva.virtual_address = iova;
219 mr_params.gva.access_flags =
220 mana_ib_verbs_to_gdma_access_flags(access_flags);
221
222 err = mana_ib_gd_create_mr(dev, mr, &mr_params);
223 if (err)
224 goto err_dma_region;
225
226 /*
227 * There is no need to keep track of dma_region_handle after MR is
228 * successfully created. The dma_region_handle is tracked in the PF
229 * as part of the lifecycle of this MR.
230 */
231
232 return &mr->ibmr;
233
234 err_dma_region:
235 mana_gd_destroy_dma_region(mdev_to_gc(dev), dma_region_handle);
236
237 err_umem:
238 ib_umem_release(mr->umem);
239
240 err_free:
241 kfree(mr);
242 return ERR_PTR(err);
243 }
244
mana_ib_get_dma_mr(struct ib_pd * ibpd,int access_flags)245 struct ib_mr *mana_ib_get_dma_mr(struct ib_pd *ibpd, int access_flags)
246 {
247 struct mana_ib_pd *pd = container_of(ibpd, struct mana_ib_pd, ibpd);
248 struct gdma_create_mr_params mr_params = {};
249 struct ib_device *ibdev = ibpd->device;
250 struct mana_ib_dev *dev;
251 struct mana_ib_mr *mr;
252 int err;
253
254 dev = container_of(ibdev, struct mana_ib_dev, ib_dev);
255
256 if (access_flags & ~VALID_DMA_MR_FLAGS)
257 return ERR_PTR(-EINVAL);
258
259 mr = kzalloc(sizeof(*mr), GFP_KERNEL);
260 if (!mr)
261 return ERR_PTR(-ENOMEM);
262
263 mr_params.pd_handle = pd->pd_handle;
264 mr_params.mr_type = GDMA_MR_TYPE_GPA;
265
266 err = mana_ib_gd_create_mr(dev, mr, &mr_params);
267 if (err)
268 goto err_free;
269
270 return &mr->ibmr;
271
272 err_free:
273 kfree(mr);
274 return ERR_PTR(err);
275 }
276
mana_ib_dereg_mr(struct ib_mr * ibmr,struct ib_udata * udata)277 int mana_ib_dereg_mr(struct ib_mr *ibmr, struct ib_udata *udata)
278 {
279 struct mana_ib_mr *mr = container_of(ibmr, struct mana_ib_mr, ibmr);
280 struct ib_device *ibdev = ibmr->device;
281 struct mana_ib_dev *dev;
282 int err;
283
284 dev = container_of(ibdev, struct mana_ib_dev, ib_dev);
285
286 err = mana_ib_gd_destroy_mr(dev, mr->mr_handle);
287 if (err)
288 return err;
289
290 if (mr->umem)
291 ib_umem_release(mr->umem);
292
293 kfree(mr);
294
295 return 0;
296 }
297