Dennis Dalessandro | 2a055eb | 2016-01-06 09:57:21 -0800 | [diff] [blame] | 1 | /* |
Dennis Dalessandro | fe31419 | 2016-01-22 13:04:58 -0800 | [diff] [blame] | 2 | * Copyright(c) 2016 Intel Corporation. |
Dennis Dalessandro | 2a055eb | 2016-01-06 09:57:21 -0800 | [diff] [blame] | 3 | * |
| 4 | * This file is provided under a dual BSD/GPLv2 license. When using or |
| 5 | * redistributing this file, you may do so under either license. |
| 6 | * |
| 7 | * GPL LICENSE SUMMARY |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of version 2 of the GNU General Public License as |
| 11 | * published by the Free Software Foundation. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, but |
| 14 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 16 | * General Public License for more details. |
| 17 | * |
| 18 | * BSD LICENSE |
| 19 | * |
| 20 | * Redistribution and use in source and binary forms, with or without |
| 21 | * modification, are permitted provided that the following conditions |
| 22 | * are met: |
| 23 | * |
| 24 | * - Redistributions of source code must retain the above copyright |
| 25 | * notice, this list of conditions and the following disclaimer. |
| 26 | * - Redistributions in binary form must reproduce the above copyright |
| 27 | * notice, this list of conditions and the following disclaimer in |
| 28 | * the documentation and/or other materials provided with the |
| 29 | * distribution. |
| 30 | * - Neither the name of Intel Corporation nor the names of its |
| 31 | * contributors may be used to endorse or promote products derived |
| 32 | * from this software without specific prior written permission. |
| 33 | * |
| 34 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 35 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 36 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 37 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 38 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 39 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 40 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 41 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 42 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 43 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 44 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 45 | * |
| 46 | */ |
| 47 | |
| 48 | #include <linux/slab.h> |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 49 | #include <linux/vmalloc.h> |
| 50 | #include <rdma/ib_umem.h> |
| 51 | #include <rdma/rdma_vt.h> |
| 52 | #include "vt.h" |
Dennis Dalessandro | 2a055eb | 2016-01-06 09:57:21 -0800 | [diff] [blame] | 53 | #include "mr.h" |
Mike Marciniszyn | fcb29a6 | 2016-12-07 19:33:20 -0800 | [diff] [blame] | 54 | #include "trace.h" |
Dennis Dalessandro | 2a055eb | 2016-01-06 09:57:21 -0800 | [diff] [blame] | 55 | |
Dennis Dalessandro | 90793f7 | 2016-02-14 12:10:29 -0800 | [diff] [blame] | 56 | /** |
| 57 | * rvt_driver_mr_init - Init MR resources per driver |
| 58 | * @rdi: rvt dev struct |
| 59 | * |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 60 | * Do any intilization needed when a driver registers with rdmavt. |
Dennis Dalessandro | 90793f7 | 2016-02-14 12:10:29 -0800 | [diff] [blame] | 61 | * |
| 62 | * Return: 0 on success or errno on failure |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 63 | */ |
| 64 | int rvt_driver_mr_init(struct rvt_dev_info *rdi) |
| 65 | { |
| 66 | unsigned int lkey_table_size = rdi->dparms.lkey_table_size; |
| 67 | unsigned lk_tab_size; |
| 68 | int i; |
| 69 | |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 70 | /* |
| 71 | * The top hfi1_lkey_table_size bits are used to index the |
| 72 | * table. The lower 8 bits can be owned by the user (copied from |
| 73 | * the LKEY). The remaining bits act as a generation number or tag. |
| 74 | */ |
| 75 | if (!lkey_table_size) |
| 76 | return -EINVAL; |
| 77 | |
| 78 | spin_lock_init(&rdi->lkey_table.lock); |
| 79 | |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 80 | /* ensure generation is at least 4 bits */ |
| 81 | if (lkey_table_size > RVT_MAX_LKEY_TABLE_BITS) { |
| 82 | rvt_pr_warn(rdi, "lkey bits %u too large, reduced to %u\n", |
| 83 | lkey_table_size, RVT_MAX_LKEY_TABLE_BITS); |
| 84 | rdi->dparms.lkey_table_size = RVT_MAX_LKEY_TABLE_BITS; |
| 85 | lkey_table_size = rdi->dparms.lkey_table_size; |
| 86 | } |
Jubin John | ade3024 | 2016-02-26 13:33:08 -0800 | [diff] [blame] | 87 | rdi->lkey_table.max = 1 << lkey_table_size; |
Mike Marciniszyn | 99f80d2 | 2016-10-10 06:14:39 -0700 | [diff] [blame] | 88 | rdi->lkey_table.shift = 32 - lkey_table_size; |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 89 | lk_tab_size = rdi->lkey_table.max * sizeof(*rdi->lkey_table.table); |
| 90 | rdi->lkey_table.table = (struct rvt_mregion __rcu **) |
Mitko Haralanov | d1b697b | 2016-02-03 14:14:54 -0800 | [diff] [blame] | 91 | vmalloc_node(lk_tab_size, rdi->dparms.node); |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 92 | if (!rdi->lkey_table.table) |
| 93 | return -ENOMEM; |
| 94 | |
| 95 | RCU_INIT_POINTER(rdi->dma_mr, NULL); |
| 96 | for (i = 0; i < rdi->lkey_table.max; i++) |
| 97 | RCU_INIT_POINTER(rdi->lkey_table.table[i], NULL); |
| 98 | |
| 99 | return 0; |
| 100 | } |
| 101 | |
Dennis Dalessandro | 90793f7 | 2016-02-14 12:10:29 -0800 | [diff] [blame] | 102 | /** |
| 103 | *rvt_mr_exit: clean up MR |
| 104 | *@rdi: rvt dev structure |
| 105 | * |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 106 | * called when drivers have unregistered or perhaps failed to register with us |
| 107 | */ |
| 108 | void rvt_mr_exit(struct rvt_dev_info *rdi) |
| 109 | { |
| 110 | if (rdi->dma_mr) |
| 111 | rvt_pr_err(rdi, "DMA MR not null!\n"); |
| 112 | |
| 113 | vfree(rdi->lkey_table.table); |
| 114 | } |
| 115 | |
| 116 | static void rvt_deinit_mregion(struct rvt_mregion *mr) |
| 117 | { |
| 118 | int i = mr->mapsz; |
| 119 | |
| 120 | mr->mapsz = 0; |
| 121 | while (i) |
| 122 | kfree(mr->map[--i]); |
Sebastian Sanchez | 338adfd | 2017-02-08 05:26:31 -0800 | [diff] [blame] | 123 | percpu_ref_exit(&mr->refcount); |
| 124 | } |
| 125 | |
| 126 | static void __rvt_mregion_complete(struct percpu_ref *ref) |
| 127 | { |
| 128 | struct rvt_mregion *mr = container_of(ref, struct rvt_mregion, |
| 129 | refcount); |
| 130 | |
| 131 | complete(&mr->comp); |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 132 | } |
| 133 | |
| 134 | static int rvt_init_mregion(struct rvt_mregion *mr, struct ib_pd *pd, |
Sebastian Sanchez | 338adfd | 2017-02-08 05:26:31 -0800 | [diff] [blame] | 135 | int count, unsigned int percpu_flags) |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 136 | { |
| 137 | int m, i = 0; |
Jubin John | 49961f8 | 2016-05-19 05:21:31 -0700 | [diff] [blame] | 138 | struct rvt_dev_info *dev = ib_to_rvt(pd->device); |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 139 | |
| 140 | mr->mapsz = 0; |
| 141 | m = (count + RVT_SEGSZ - 1) / RVT_SEGSZ; |
| 142 | for (; i < m; i++) { |
Jubin John | 49961f8 | 2016-05-19 05:21:31 -0700 | [diff] [blame] | 143 | mr->map[i] = kzalloc_node(sizeof(*mr->map[0]), GFP_KERNEL, |
| 144 | dev->dparms.node); |
Sebastian Sanchez | 338adfd | 2017-02-08 05:26:31 -0800 | [diff] [blame] | 145 | if (!mr->map[i]) |
| 146 | goto bail; |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 147 | mr->mapsz++; |
| 148 | } |
| 149 | init_completion(&mr->comp); |
| 150 | /* count returning the ptr to user */ |
Sebastian Sanchez | 338adfd | 2017-02-08 05:26:31 -0800 | [diff] [blame] | 151 | if (percpu_ref_init(&mr->refcount, &__rvt_mregion_complete, |
| 152 | percpu_flags, GFP_KERNEL)) |
| 153 | goto bail; |
| 154 | |
Jianxin Xiong | e8f8b09 | 2016-07-25 13:38:19 -0700 | [diff] [blame] | 155 | atomic_set(&mr->lkey_invalid, 0); |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 156 | mr->pd = pd; |
| 157 | mr->max_segs = count; |
| 158 | return 0; |
Sebastian Sanchez | 338adfd | 2017-02-08 05:26:31 -0800 | [diff] [blame] | 159 | bail: |
| 160 | rvt_deinit_mregion(mr); |
| 161 | return -ENOMEM; |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 162 | } |
| 163 | |
| 164 | /** |
| 165 | * rvt_alloc_lkey - allocate an lkey |
| 166 | * @mr: memory region that this lkey protects |
| 167 | * @dma_region: 0->normal key, 1->restricted DMA key |
| 168 | * |
| 169 | * Returns 0 if successful, otherwise returns -errno. |
| 170 | * |
| 171 | * Increments mr reference count as required. |
| 172 | * |
| 173 | * Sets the lkey field mr for non-dma regions. |
| 174 | * |
| 175 | */ |
| 176 | static int rvt_alloc_lkey(struct rvt_mregion *mr, int dma_region) |
| 177 | { |
| 178 | unsigned long flags; |
| 179 | u32 r; |
| 180 | u32 n; |
| 181 | int ret = 0; |
| 182 | struct rvt_dev_info *dev = ib_to_rvt(mr->pd->device); |
| 183 | struct rvt_lkey_table *rkt = &dev->lkey_table; |
| 184 | |
| 185 | rvt_get_mr(mr); |
| 186 | spin_lock_irqsave(&rkt->lock, flags); |
| 187 | |
| 188 | /* special case for dma_mr lkey == 0 */ |
| 189 | if (dma_region) { |
| 190 | struct rvt_mregion *tmr; |
| 191 | |
| 192 | tmr = rcu_access_pointer(dev->dma_mr); |
| 193 | if (!tmr) { |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 194 | mr->lkey_published = 1; |
Mike Marciniszyn | b58fc80 | 2017-03-20 17:26:26 -0700 | [diff] [blame] | 195 | /* Insure published written first */ |
| 196 | rcu_assign_pointer(dev->dma_mr, mr); |
Sebastian Sanchez | 338adfd | 2017-02-08 05:26:31 -0800 | [diff] [blame] | 197 | rvt_get_mr(mr); |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 198 | } |
| 199 | goto success; |
| 200 | } |
| 201 | |
| 202 | /* Find the next available LKEY */ |
| 203 | r = rkt->next; |
| 204 | n = r; |
| 205 | for (;;) { |
| 206 | if (!rcu_access_pointer(rkt->table[r])) |
| 207 | break; |
| 208 | r = (r + 1) & (rkt->max - 1); |
| 209 | if (r == n) |
| 210 | goto bail; |
| 211 | } |
| 212 | rkt->next = (r + 1) & (rkt->max - 1); |
| 213 | /* |
| 214 | * Make sure lkey is never zero which is reserved to indicate an |
| 215 | * unrestricted LKEY. |
| 216 | */ |
| 217 | rkt->gen++; |
| 218 | /* |
| 219 | * bits are capped to ensure enough bits for generation number |
| 220 | */ |
| 221 | mr->lkey = (r << (32 - dev->dparms.lkey_table_size)) | |
| 222 | ((((1 << (24 - dev->dparms.lkey_table_size)) - 1) & rkt->gen) |
| 223 | << 8); |
| 224 | if (mr->lkey == 0) { |
| 225 | mr->lkey |= 1 << 8; |
| 226 | rkt->gen++; |
| 227 | } |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 228 | mr->lkey_published = 1; |
Mike Marciniszyn | b58fc80 | 2017-03-20 17:26:26 -0700 | [diff] [blame] | 229 | /* Insure published written first */ |
| 230 | rcu_assign_pointer(rkt->table[r], mr); |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 231 | success: |
| 232 | spin_unlock_irqrestore(&rkt->lock, flags); |
| 233 | out: |
| 234 | return ret; |
| 235 | bail: |
| 236 | rvt_put_mr(mr); |
| 237 | spin_unlock_irqrestore(&rkt->lock, flags); |
| 238 | ret = -ENOMEM; |
| 239 | goto out; |
| 240 | } |
| 241 | |
| 242 | /** |
| 243 | * rvt_free_lkey - free an lkey |
| 244 | * @mr: mr to free from tables |
| 245 | */ |
| 246 | static void rvt_free_lkey(struct rvt_mregion *mr) |
| 247 | { |
| 248 | unsigned long flags; |
| 249 | u32 lkey = mr->lkey; |
| 250 | u32 r; |
| 251 | struct rvt_dev_info *dev = ib_to_rvt(mr->pd->device); |
| 252 | struct rvt_lkey_table *rkt = &dev->lkey_table; |
| 253 | int freed = 0; |
| 254 | |
| 255 | spin_lock_irqsave(&rkt->lock, flags); |
Sebastian Sanchez | 338adfd | 2017-02-08 05:26:31 -0800 | [diff] [blame] | 256 | if (!lkey) { |
| 257 | if (mr->lkey_published) { |
Mike Marciniszyn | b58fc80 | 2017-03-20 17:26:26 -0700 | [diff] [blame] | 258 | mr->lkey_published = 0; |
| 259 | /* insure published is written before pointer */ |
| 260 | rcu_assign_pointer(dev->dma_mr, NULL); |
Sebastian Sanchez | 338adfd | 2017-02-08 05:26:31 -0800 | [diff] [blame] | 261 | rvt_put_mr(mr); |
| 262 | } |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 263 | } else { |
Sebastian Sanchez | 338adfd | 2017-02-08 05:26:31 -0800 | [diff] [blame] | 264 | if (!mr->lkey_published) |
| 265 | goto out; |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 266 | r = lkey >> (32 - dev->dparms.lkey_table_size); |
Mike Marciniszyn | b58fc80 | 2017-03-20 17:26:26 -0700 | [diff] [blame] | 267 | mr->lkey_published = 0; |
| 268 | /* insure published is written before pointer */ |
| 269 | rcu_assign_pointer(rkt->table[r], NULL); |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 270 | } |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 271 | freed++; |
| 272 | out: |
| 273 | spin_unlock_irqrestore(&rkt->lock, flags); |
Mike Marciniszyn | b58fc80 | 2017-03-20 17:26:26 -0700 | [diff] [blame] | 274 | if (freed) |
Sebastian Sanchez | 338adfd | 2017-02-08 05:26:31 -0800 | [diff] [blame] | 275 | percpu_ref_kill(&mr->refcount); |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 276 | } |
| 277 | |
| 278 | static struct rvt_mr *__rvt_alloc_mr(int count, struct ib_pd *pd) |
| 279 | { |
| 280 | struct rvt_mr *mr; |
| 281 | int rval = -ENOMEM; |
| 282 | int m; |
| 283 | |
| 284 | /* Allocate struct plus pointers to first level page tables. */ |
| 285 | m = (count + RVT_SEGSZ - 1) / RVT_SEGSZ; |
| 286 | mr = kzalloc(sizeof(*mr) + m * sizeof(mr->mr.map[0]), GFP_KERNEL); |
| 287 | if (!mr) |
| 288 | goto bail; |
| 289 | |
Sebastian Sanchez | 338adfd | 2017-02-08 05:26:31 -0800 | [diff] [blame] | 290 | rval = rvt_init_mregion(&mr->mr, pd, count, 0); |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 291 | if (rval) |
| 292 | goto bail; |
| 293 | /* |
| 294 | * ib_reg_phys_mr() will initialize mr->ibmr except for |
| 295 | * lkey and rkey. |
| 296 | */ |
| 297 | rval = rvt_alloc_lkey(&mr->mr, 0); |
| 298 | if (rval) |
| 299 | goto bail_mregion; |
| 300 | mr->ibmr.lkey = mr->mr.lkey; |
| 301 | mr->ibmr.rkey = mr->mr.lkey; |
| 302 | done: |
| 303 | return mr; |
| 304 | |
| 305 | bail_mregion: |
| 306 | rvt_deinit_mregion(&mr->mr); |
| 307 | bail: |
| 308 | kfree(mr); |
| 309 | mr = ERR_PTR(rval); |
| 310 | goto done; |
| 311 | } |
| 312 | |
| 313 | static void __rvt_free_mr(struct rvt_mr *mr) |
| 314 | { |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 315 | rvt_free_lkey(&mr->mr); |
Sebastian Sanchez | 338adfd | 2017-02-08 05:26:31 -0800 | [diff] [blame] | 316 | rvt_deinit_mregion(&mr->mr); |
Colin Ian King | e4618d4 | 2016-09-09 08:15:37 +0100 | [diff] [blame] | 317 | kfree(mr); |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 318 | } |
| 319 | |
Dennis Dalessandro | 2a055eb | 2016-01-06 09:57:21 -0800 | [diff] [blame] | 320 | /** |
| 321 | * rvt_get_dma_mr - get a DMA memory region |
| 322 | * @pd: protection domain for this memory region |
| 323 | * @acc: access flags |
| 324 | * |
Dennis Dalessandro | 90793f7 | 2016-02-14 12:10:29 -0800 | [diff] [blame] | 325 | * Return: the memory region on success, otherwise returns an errno. |
Bart Van Assche | 0bbb3b7 | 2017-01-20 13:04:37 -0800 | [diff] [blame] | 326 | * Note that all DMA addresses should be created via the functions in |
| 327 | * struct dma_virt_ops. |
Dennis Dalessandro | 2a055eb | 2016-01-06 09:57:21 -0800 | [diff] [blame] | 328 | */ |
| 329 | struct ib_mr *rvt_get_dma_mr(struct ib_pd *pd, int acc) |
| 330 | { |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 331 | struct rvt_mr *mr; |
| 332 | struct ib_mr *ret; |
| 333 | int rval; |
| 334 | |
| 335 | if (ibpd_to_rvtpd(pd)->user) |
| 336 | return ERR_PTR(-EPERM); |
| 337 | |
| 338 | mr = kzalloc(sizeof(*mr), GFP_KERNEL); |
| 339 | if (!mr) { |
| 340 | ret = ERR_PTR(-ENOMEM); |
| 341 | goto bail; |
| 342 | } |
| 343 | |
Sebastian Sanchez | 338adfd | 2017-02-08 05:26:31 -0800 | [diff] [blame] | 344 | rval = rvt_init_mregion(&mr->mr, pd, 0, 0); |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 345 | if (rval) { |
| 346 | ret = ERR_PTR(rval); |
| 347 | goto bail; |
| 348 | } |
| 349 | |
| 350 | rval = rvt_alloc_lkey(&mr->mr, 1); |
| 351 | if (rval) { |
| 352 | ret = ERR_PTR(rval); |
| 353 | goto bail_mregion; |
| 354 | } |
| 355 | |
| 356 | mr->mr.access_flags = acc; |
| 357 | ret = &mr->ibmr; |
| 358 | done: |
| 359 | return ret; |
| 360 | |
| 361 | bail_mregion: |
| 362 | rvt_deinit_mregion(&mr->mr); |
| 363 | bail: |
| 364 | kfree(mr); |
| 365 | goto done; |
Dennis Dalessandro | 2a055eb | 2016-01-06 09:57:21 -0800 | [diff] [blame] | 366 | } |
| 367 | |
| 368 | /** |
| 369 | * rvt_reg_user_mr - register a userspace memory region |
| 370 | * @pd: protection domain for this memory region |
| 371 | * @start: starting userspace address |
| 372 | * @length: length of region to register |
| 373 | * @mr_access_flags: access flags for this memory region |
| 374 | * @udata: unused by the driver |
| 375 | * |
Dennis Dalessandro | 90793f7 | 2016-02-14 12:10:29 -0800 | [diff] [blame] | 376 | * Return: the memory region on success, otherwise returns an errno. |
Dennis Dalessandro | 2a055eb | 2016-01-06 09:57:21 -0800 | [diff] [blame] | 377 | */ |
| 378 | struct ib_mr *rvt_reg_user_mr(struct ib_pd *pd, u64 start, u64 length, |
| 379 | u64 virt_addr, int mr_access_flags, |
| 380 | struct ib_udata *udata) |
| 381 | { |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 382 | struct rvt_mr *mr; |
| 383 | struct ib_umem *umem; |
| 384 | struct scatterlist *sg; |
| 385 | int n, m, entry; |
| 386 | struct ib_mr *ret; |
| 387 | |
| 388 | if (length == 0) |
| 389 | return ERR_PTR(-EINVAL); |
| 390 | |
| 391 | umem = ib_umem_get(pd->uobject->context, start, length, |
| 392 | mr_access_flags, 0); |
| 393 | if (IS_ERR(umem)) |
| 394 | return (void *)umem; |
| 395 | |
| 396 | n = umem->nmap; |
| 397 | |
| 398 | mr = __rvt_alloc_mr(n, pd); |
| 399 | if (IS_ERR(mr)) { |
| 400 | ret = (struct ib_mr *)mr; |
| 401 | goto bail_umem; |
| 402 | } |
| 403 | |
| 404 | mr->mr.user_base = start; |
| 405 | mr->mr.iova = virt_addr; |
| 406 | mr->mr.length = length; |
| 407 | mr->mr.offset = ib_umem_offset(umem); |
| 408 | mr->mr.access_flags = mr_access_flags; |
| 409 | mr->umem = umem; |
| 410 | |
Artemy Kovalyov | 3e7e119 | 2017-04-05 09:23:50 +0300 | [diff] [blame^] | 411 | mr->mr.page_shift = umem->page_shift; |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 412 | m = 0; |
| 413 | n = 0; |
| 414 | for_each_sg(umem->sg_head.sgl, sg, umem->nmap, entry) { |
| 415 | void *vaddr; |
| 416 | |
| 417 | vaddr = page_address(sg_page(sg)); |
| 418 | if (!vaddr) { |
| 419 | ret = ERR_PTR(-EINVAL); |
| 420 | goto bail_inval; |
| 421 | } |
| 422 | mr->mr.map[m]->segs[n].vaddr = vaddr; |
Artemy Kovalyov | 3e7e119 | 2017-04-05 09:23:50 +0300 | [diff] [blame^] | 423 | mr->mr.map[m]->segs[n].length = BIT(umem->page_shift); |
| 424 | trace_rvt_mr_user_seg(&mr->mr, m, n, vaddr, |
| 425 | BIT(umem->page_shift)); |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 426 | n++; |
| 427 | if (n == RVT_SEGSZ) { |
| 428 | m++; |
| 429 | n = 0; |
| 430 | } |
| 431 | } |
| 432 | return &mr->ibmr; |
| 433 | |
| 434 | bail_inval: |
| 435 | __rvt_free_mr(mr); |
| 436 | |
| 437 | bail_umem: |
| 438 | ib_umem_release(umem); |
| 439 | |
| 440 | return ret; |
Dennis Dalessandro | 2a055eb | 2016-01-06 09:57:21 -0800 | [diff] [blame] | 441 | } |
| 442 | |
| 443 | /** |
| 444 | * rvt_dereg_mr - unregister and free a memory region |
| 445 | * @ibmr: the memory region to free |
| 446 | * |
Dennis Dalessandro | 2a055eb | 2016-01-06 09:57:21 -0800 | [diff] [blame] | 447 | * |
| 448 | * Note that this is called to free MRs created by rvt_get_dma_mr() |
| 449 | * or rvt_reg_user_mr(). |
Dennis Dalessandro | 90793f7 | 2016-02-14 12:10:29 -0800 | [diff] [blame] | 450 | * |
| 451 | * Returns 0 on success. |
Dennis Dalessandro | 2a055eb | 2016-01-06 09:57:21 -0800 | [diff] [blame] | 452 | */ |
| 453 | int rvt_dereg_mr(struct ib_mr *ibmr) |
| 454 | { |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 455 | struct rvt_mr *mr = to_imr(ibmr); |
| 456 | struct rvt_dev_info *rdi = ib_to_rvt(ibmr->pd->device); |
| 457 | int ret = 0; |
| 458 | unsigned long timeout; |
| 459 | |
| 460 | rvt_free_lkey(&mr->mr); |
| 461 | |
| 462 | rvt_put_mr(&mr->mr); /* will set completion if last */ |
| 463 | timeout = wait_for_completion_timeout(&mr->mr.comp, 5 * HZ); |
| 464 | if (!timeout) { |
| 465 | rvt_pr_err(rdi, |
Sebastian Sanchez | 338adfd | 2017-02-08 05:26:31 -0800 | [diff] [blame] | 466 | "rvt_dereg_mr timeout mr %p pd %p\n", |
| 467 | mr, mr->mr.pd); |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 468 | rvt_get_mr(&mr->mr); |
| 469 | ret = -EBUSY; |
| 470 | goto out; |
| 471 | } |
| 472 | rvt_deinit_mregion(&mr->mr); |
| 473 | if (mr->umem) |
| 474 | ib_umem_release(mr->umem); |
| 475 | kfree(mr); |
| 476 | out: |
| 477 | return ret; |
Dennis Dalessandro | 2a055eb | 2016-01-06 09:57:21 -0800 | [diff] [blame] | 478 | } |
| 479 | |
| 480 | /** |
| 481 | * rvt_alloc_mr - Allocate a memory region usable with the |
| 482 | * @pd: protection domain for this memory region |
| 483 | * @mr_type: mem region type |
| 484 | * @max_num_sg: Max number of segments allowed |
| 485 | * |
Dennis Dalessandro | 90793f7 | 2016-02-14 12:10:29 -0800 | [diff] [blame] | 486 | * Return: the memory region on success, otherwise return an errno. |
Dennis Dalessandro | 2a055eb | 2016-01-06 09:57:21 -0800 | [diff] [blame] | 487 | */ |
| 488 | struct ib_mr *rvt_alloc_mr(struct ib_pd *pd, |
| 489 | enum ib_mr_type mr_type, |
| 490 | u32 max_num_sg) |
| 491 | { |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 492 | struct rvt_mr *mr; |
| 493 | |
| 494 | if (mr_type != IB_MR_TYPE_MEM_REG) |
| 495 | return ERR_PTR(-EINVAL); |
| 496 | |
| 497 | mr = __rvt_alloc_mr(max_num_sg, pd); |
| 498 | if (IS_ERR(mr)) |
| 499 | return (struct ib_mr *)mr; |
| 500 | |
| 501 | return &mr->ibmr; |
Dennis Dalessandro | 2a055eb | 2016-01-06 09:57:21 -0800 | [diff] [blame] | 502 | } |
| 503 | |
| 504 | /** |
Jianxin Xiong | a41081a | 2016-07-25 13:38:13 -0700 | [diff] [blame] | 505 | * rvt_set_page - page assignment function called by ib_sg_to_pages |
| 506 | * @ibmr: memory region |
| 507 | * @addr: dma address of mapped page |
| 508 | * |
| 509 | * Return: 0 on success |
| 510 | */ |
| 511 | static int rvt_set_page(struct ib_mr *ibmr, u64 addr) |
| 512 | { |
| 513 | struct rvt_mr *mr = to_imr(ibmr); |
| 514 | u32 ps = 1 << mr->mr.page_shift; |
| 515 | u32 mapped_segs = mr->mr.length >> mr->mr.page_shift; |
| 516 | int m, n; |
| 517 | |
| 518 | if (unlikely(mapped_segs == mr->mr.max_segs)) |
| 519 | return -ENOMEM; |
| 520 | |
| 521 | if (mr->mr.length == 0) { |
| 522 | mr->mr.user_base = addr; |
| 523 | mr->mr.iova = addr; |
| 524 | } |
| 525 | |
| 526 | m = mapped_segs / RVT_SEGSZ; |
| 527 | n = mapped_segs % RVT_SEGSZ; |
| 528 | mr->mr.map[m]->segs[n].vaddr = (void *)addr; |
| 529 | mr->mr.map[m]->segs[n].length = ps; |
Mike Marciniszyn | fcb29a6 | 2016-12-07 19:33:20 -0800 | [diff] [blame] | 530 | trace_rvt_mr_page_seg(&mr->mr, m, n, (void *)addr, ps); |
Jianxin Xiong | a41081a | 2016-07-25 13:38:13 -0700 | [diff] [blame] | 531 | mr->mr.length += ps; |
| 532 | |
| 533 | return 0; |
| 534 | } |
| 535 | |
| 536 | /** |
| 537 | * rvt_map_mr_sg - map sg list and set it the memory region |
| 538 | * @ibmr: memory region |
| 539 | * @sg: dma mapped scatterlist |
| 540 | * @sg_nents: number of entries in sg |
| 541 | * @sg_offset: offset in bytes into sg |
| 542 | * |
| 543 | * Return: number of sg elements mapped to the memory region |
| 544 | */ |
| 545 | int rvt_map_mr_sg(struct ib_mr *ibmr, struct scatterlist *sg, |
| 546 | int sg_nents, unsigned int *sg_offset) |
| 547 | { |
| 548 | struct rvt_mr *mr = to_imr(ibmr); |
| 549 | |
| 550 | mr->mr.length = 0; |
| 551 | mr->mr.page_shift = PAGE_SHIFT; |
| 552 | return ib_sg_to_pages(ibmr, sg, sg_nents, sg_offset, |
| 553 | rvt_set_page); |
| 554 | } |
| 555 | |
| 556 | /** |
Jianxin Xiong | e8f8b09 | 2016-07-25 13:38:19 -0700 | [diff] [blame] | 557 | * rvt_fast_reg_mr - fast register physical MR |
| 558 | * @qp: the queue pair where the work request comes from |
| 559 | * @ibmr: the memory region to be registered |
| 560 | * @key: updated key for this memory region |
| 561 | * @access: access flags for this memory region |
| 562 | * |
| 563 | * Returns 0 on success. |
| 564 | */ |
| 565 | int rvt_fast_reg_mr(struct rvt_qp *qp, struct ib_mr *ibmr, u32 key, |
| 566 | int access) |
| 567 | { |
| 568 | struct rvt_mr *mr = to_imr(ibmr); |
| 569 | |
| 570 | if (qp->ibqp.pd != mr->mr.pd) |
| 571 | return -EACCES; |
| 572 | |
| 573 | /* not applicable to dma MR or user MR */ |
| 574 | if (!mr->mr.lkey || mr->umem) |
| 575 | return -EINVAL; |
| 576 | |
| 577 | if ((key & 0xFFFFFF00) != (mr->mr.lkey & 0xFFFFFF00)) |
| 578 | return -EINVAL; |
| 579 | |
| 580 | ibmr->lkey = key; |
| 581 | ibmr->rkey = key; |
| 582 | mr->mr.lkey = key; |
| 583 | mr->mr.access_flags = access; |
| 584 | atomic_set(&mr->mr.lkey_invalid, 0); |
| 585 | |
| 586 | return 0; |
| 587 | } |
| 588 | EXPORT_SYMBOL(rvt_fast_reg_mr); |
| 589 | |
| 590 | /** |
| 591 | * rvt_invalidate_rkey - invalidate an MR rkey |
| 592 | * @qp: queue pair associated with the invalidate op |
| 593 | * @rkey: rkey to invalidate |
| 594 | * |
| 595 | * Returns 0 on success. |
| 596 | */ |
| 597 | int rvt_invalidate_rkey(struct rvt_qp *qp, u32 rkey) |
| 598 | { |
| 599 | struct rvt_dev_info *dev = ib_to_rvt(qp->ibqp.device); |
| 600 | struct rvt_lkey_table *rkt = &dev->lkey_table; |
| 601 | struct rvt_mregion *mr; |
| 602 | |
| 603 | if (rkey == 0) |
| 604 | return -EINVAL; |
| 605 | |
| 606 | rcu_read_lock(); |
| 607 | mr = rcu_dereference( |
| 608 | rkt->table[(rkey >> (32 - dev->dparms.lkey_table_size))]); |
| 609 | if (unlikely(!mr || mr->lkey != rkey || qp->ibqp.pd != mr->pd)) |
| 610 | goto bail; |
| 611 | |
| 612 | atomic_set(&mr->lkey_invalid, 1); |
| 613 | rcu_read_unlock(); |
| 614 | return 0; |
| 615 | |
| 616 | bail: |
| 617 | rcu_read_unlock(); |
| 618 | return -EINVAL; |
| 619 | } |
| 620 | EXPORT_SYMBOL(rvt_invalidate_rkey); |
| 621 | |
| 622 | /** |
Dennis Dalessandro | 2a055eb | 2016-01-06 09:57:21 -0800 | [diff] [blame] | 623 | * rvt_alloc_fmr - allocate a fast memory region |
| 624 | * @pd: the protection domain for this memory region |
| 625 | * @mr_access_flags: access flags for this memory region |
| 626 | * @fmr_attr: fast memory region attributes |
| 627 | * |
Dennis Dalessandro | 90793f7 | 2016-02-14 12:10:29 -0800 | [diff] [blame] | 628 | * Return: the memory region on success, otherwise returns an errno. |
Dennis Dalessandro | 2a055eb | 2016-01-06 09:57:21 -0800 | [diff] [blame] | 629 | */ |
| 630 | struct ib_fmr *rvt_alloc_fmr(struct ib_pd *pd, int mr_access_flags, |
| 631 | struct ib_fmr_attr *fmr_attr) |
| 632 | { |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 633 | struct rvt_fmr *fmr; |
| 634 | int m; |
| 635 | struct ib_fmr *ret; |
| 636 | int rval = -ENOMEM; |
| 637 | |
| 638 | /* Allocate struct plus pointers to first level page tables. */ |
| 639 | m = (fmr_attr->max_pages + RVT_SEGSZ - 1) / RVT_SEGSZ; |
| 640 | fmr = kzalloc(sizeof(*fmr) + m * sizeof(fmr->mr.map[0]), GFP_KERNEL); |
| 641 | if (!fmr) |
| 642 | goto bail; |
| 643 | |
Sebastian Sanchez | 338adfd | 2017-02-08 05:26:31 -0800 | [diff] [blame] | 644 | rval = rvt_init_mregion(&fmr->mr, pd, fmr_attr->max_pages, |
| 645 | PERCPU_REF_INIT_ATOMIC); |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 646 | if (rval) |
| 647 | goto bail; |
| 648 | |
| 649 | /* |
| 650 | * ib_alloc_fmr() will initialize fmr->ibfmr except for lkey & |
| 651 | * rkey. |
| 652 | */ |
| 653 | rval = rvt_alloc_lkey(&fmr->mr, 0); |
| 654 | if (rval) |
| 655 | goto bail_mregion; |
| 656 | fmr->ibfmr.rkey = fmr->mr.lkey; |
| 657 | fmr->ibfmr.lkey = fmr->mr.lkey; |
| 658 | /* |
| 659 | * Resources are allocated but no valid mapping (RKEY can't be |
| 660 | * used). |
| 661 | */ |
| 662 | fmr->mr.access_flags = mr_access_flags; |
| 663 | fmr->mr.max_segs = fmr_attr->max_pages; |
| 664 | fmr->mr.page_shift = fmr_attr->page_shift; |
| 665 | |
| 666 | ret = &fmr->ibfmr; |
| 667 | done: |
| 668 | return ret; |
| 669 | |
| 670 | bail_mregion: |
| 671 | rvt_deinit_mregion(&fmr->mr); |
| 672 | bail: |
| 673 | kfree(fmr); |
| 674 | ret = ERR_PTR(rval); |
| 675 | goto done; |
Dennis Dalessandro | 2a055eb | 2016-01-06 09:57:21 -0800 | [diff] [blame] | 676 | } |
| 677 | |
| 678 | /** |
| 679 | * rvt_map_phys_fmr - set up a fast memory region |
| 680 | * @ibmfr: the fast memory region to set up |
| 681 | * @page_list: the list of pages to associate with the fast memory region |
| 682 | * @list_len: the number of pages to associate with the fast memory region |
| 683 | * @iova: the virtual address of the start of the fast memory region |
| 684 | * |
| 685 | * This may be called from interrupt context. |
Dennis Dalessandro | 90793f7 | 2016-02-14 12:10:29 -0800 | [diff] [blame] | 686 | * |
| 687 | * Return: 0 on success |
Dennis Dalessandro | 2a055eb | 2016-01-06 09:57:21 -0800 | [diff] [blame] | 688 | */ |
| 689 | |
| 690 | int rvt_map_phys_fmr(struct ib_fmr *ibfmr, u64 *page_list, |
| 691 | int list_len, u64 iova) |
| 692 | { |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 693 | struct rvt_fmr *fmr = to_ifmr(ibfmr); |
| 694 | struct rvt_lkey_table *rkt; |
| 695 | unsigned long flags; |
Sebastian Sanchez | 338adfd | 2017-02-08 05:26:31 -0800 | [diff] [blame] | 696 | int m, n; |
| 697 | unsigned long i; |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 698 | u32 ps; |
| 699 | struct rvt_dev_info *rdi = ib_to_rvt(ibfmr->device); |
| 700 | |
Sebastian Sanchez | 338adfd | 2017-02-08 05:26:31 -0800 | [diff] [blame] | 701 | i = atomic_long_read(&fmr->mr.refcount.count); |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 702 | if (i > 2) |
| 703 | return -EBUSY; |
| 704 | |
| 705 | if (list_len > fmr->mr.max_segs) |
| 706 | return -EINVAL; |
| 707 | |
| 708 | rkt = &rdi->lkey_table; |
| 709 | spin_lock_irqsave(&rkt->lock, flags); |
| 710 | fmr->mr.user_base = iova; |
| 711 | fmr->mr.iova = iova; |
| 712 | ps = 1 << fmr->mr.page_shift; |
| 713 | fmr->mr.length = list_len * ps; |
| 714 | m = 0; |
| 715 | n = 0; |
| 716 | for (i = 0; i < list_len; i++) { |
| 717 | fmr->mr.map[m]->segs[n].vaddr = (void *)page_list[i]; |
| 718 | fmr->mr.map[m]->segs[n].length = ps; |
Mike Marciniszyn | fcb29a6 | 2016-12-07 19:33:20 -0800 | [diff] [blame] | 719 | trace_rvt_mr_fmr_seg(&fmr->mr, m, n, (void *)page_list[i], ps); |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 720 | if (++n == RVT_SEGSZ) { |
| 721 | m++; |
| 722 | n = 0; |
| 723 | } |
| 724 | } |
| 725 | spin_unlock_irqrestore(&rkt->lock, flags); |
| 726 | return 0; |
Dennis Dalessandro | 2a055eb | 2016-01-06 09:57:21 -0800 | [diff] [blame] | 727 | } |
| 728 | |
| 729 | /** |
| 730 | * rvt_unmap_fmr - unmap fast memory regions |
| 731 | * @fmr_list: the list of fast memory regions to unmap |
| 732 | * |
Dennis Dalessandro | 90793f7 | 2016-02-14 12:10:29 -0800 | [diff] [blame] | 733 | * Return: 0 on success. |
Dennis Dalessandro | 2a055eb | 2016-01-06 09:57:21 -0800 | [diff] [blame] | 734 | */ |
| 735 | int rvt_unmap_fmr(struct list_head *fmr_list) |
| 736 | { |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 737 | struct rvt_fmr *fmr; |
| 738 | struct rvt_lkey_table *rkt; |
| 739 | unsigned long flags; |
| 740 | struct rvt_dev_info *rdi; |
| 741 | |
| 742 | list_for_each_entry(fmr, fmr_list, ibfmr.list) { |
| 743 | rdi = ib_to_rvt(fmr->ibfmr.device); |
| 744 | rkt = &rdi->lkey_table; |
| 745 | spin_lock_irqsave(&rkt->lock, flags); |
| 746 | fmr->mr.user_base = 0; |
| 747 | fmr->mr.iova = 0; |
| 748 | fmr->mr.length = 0; |
| 749 | spin_unlock_irqrestore(&rkt->lock, flags); |
| 750 | } |
| 751 | return 0; |
Dennis Dalessandro | 2a055eb | 2016-01-06 09:57:21 -0800 | [diff] [blame] | 752 | } |
| 753 | |
| 754 | /** |
| 755 | * rvt_dealloc_fmr - deallocate a fast memory region |
| 756 | * @ibfmr: the fast memory region to deallocate |
| 757 | * |
Dennis Dalessandro | 90793f7 | 2016-02-14 12:10:29 -0800 | [diff] [blame] | 758 | * Return: 0 on success. |
Dennis Dalessandro | 2a055eb | 2016-01-06 09:57:21 -0800 | [diff] [blame] | 759 | */ |
| 760 | int rvt_dealloc_fmr(struct ib_fmr *ibfmr) |
| 761 | { |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 762 | struct rvt_fmr *fmr = to_ifmr(ibfmr); |
| 763 | int ret = 0; |
| 764 | unsigned long timeout; |
| 765 | |
| 766 | rvt_free_lkey(&fmr->mr); |
| 767 | rvt_put_mr(&fmr->mr); /* will set completion if last */ |
| 768 | timeout = wait_for_completion_timeout(&fmr->mr.comp, 5 * HZ); |
| 769 | if (!timeout) { |
| 770 | rvt_get_mr(&fmr->mr); |
| 771 | ret = -EBUSY; |
| 772 | goto out; |
| 773 | } |
| 774 | rvt_deinit_mregion(&fmr->mr); |
| 775 | kfree(fmr); |
| 776 | out: |
| 777 | return ret; |
Dennis Dalessandro | 2a055eb | 2016-01-06 09:57:21 -0800 | [diff] [blame] | 778 | } |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 779 | |
| 780 | /** |
| 781 | * rvt_lkey_ok - check IB SGE for validity and initialize |
| 782 | * @rkt: table containing lkey to check SGE against |
| 783 | * @pd: protection domain |
| 784 | * @isge: outgoing internal SGE |
| 785 | * @sge: SGE to check |
| 786 | * @acc: access flags |
| 787 | * |
Dennis Dalessandro | 90793f7 | 2016-02-14 12:10:29 -0800 | [diff] [blame] | 788 | * Check the IB SGE for validity and initialize our internal version |
| 789 | * of it. |
| 790 | * |
| 791 | * Return: 1 if valid and successful, otherwise returns 0. |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 792 | * |
| 793 | * increments the reference count upon success |
| 794 | * |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 795 | */ |
| 796 | int rvt_lkey_ok(struct rvt_lkey_table *rkt, struct rvt_pd *pd, |
| 797 | struct rvt_sge *isge, struct ib_sge *sge, int acc) |
| 798 | { |
| 799 | struct rvt_mregion *mr; |
| 800 | unsigned n, m; |
| 801 | size_t off; |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 802 | |
| 803 | /* |
| 804 | * We use LKEY == zero for kernel virtual addresses |
Bart Van Assche | 0bbb3b7 | 2017-01-20 13:04:37 -0800 | [diff] [blame] | 805 | * (see rvt_get_dma_mr() and dma_virt_ops). |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 806 | */ |
| 807 | rcu_read_lock(); |
| 808 | if (sge->lkey == 0) { |
Mike Marciniszyn | 99f80d2 | 2016-10-10 06:14:39 -0700 | [diff] [blame] | 809 | struct rvt_dev_info *dev = ib_to_rvt(pd->ibpd.device); |
| 810 | |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 811 | if (pd->user) |
| 812 | goto bail; |
| 813 | mr = rcu_dereference(dev->dma_mr); |
| 814 | if (!mr) |
| 815 | goto bail; |
Sebastian Sanchez | f84dfa2 | 2016-12-07 19:33:53 -0800 | [diff] [blame] | 816 | rvt_get_mr(mr); |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 817 | rcu_read_unlock(); |
| 818 | |
| 819 | isge->mr = mr; |
| 820 | isge->vaddr = (void *)sge->addr; |
| 821 | isge->length = sge->length; |
| 822 | isge->sge_length = sge->length; |
| 823 | isge->m = 0; |
| 824 | isge->n = 0; |
| 825 | goto ok; |
| 826 | } |
Mike Marciniszyn | 99f80d2 | 2016-10-10 06:14:39 -0700 | [diff] [blame] | 827 | mr = rcu_dereference(rkt->table[sge->lkey >> rkt->shift]); |
Mike Marciniszyn | b58fc80 | 2017-03-20 17:26:26 -0700 | [diff] [blame] | 828 | if (!mr) |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 829 | goto bail; |
Mike Marciniszyn | b58fc80 | 2017-03-20 17:26:26 -0700 | [diff] [blame] | 830 | rvt_get_mr(mr); |
| 831 | if (!READ_ONCE(mr->lkey_published)) |
| 832 | goto bail_unref; |
| 833 | |
| 834 | if (unlikely(atomic_read(&mr->lkey_invalid) || |
| 835 | mr->lkey != sge->lkey || mr->pd != &pd->ibpd)) |
| 836 | goto bail_unref; |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 837 | |
| 838 | off = sge->addr - mr->user_base; |
| 839 | if (unlikely(sge->addr < mr->user_base || |
| 840 | off + sge->length > mr->length || |
| 841 | (mr->access_flags & acc) != acc)) |
Mike Marciniszyn | b58fc80 | 2017-03-20 17:26:26 -0700 | [diff] [blame] | 842 | goto bail_unref; |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 843 | rcu_read_unlock(); |
| 844 | |
| 845 | off += mr->offset; |
| 846 | if (mr->page_shift) { |
| 847 | /* |
| 848 | * page sizes are uniform power of 2 so no loop is necessary |
| 849 | * entries_spanned_by_off is the number of times the loop below |
| 850 | * would have executed. |
| 851 | */ |
| 852 | size_t entries_spanned_by_off; |
| 853 | |
| 854 | entries_spanned_by_off = off >> mr->page_shift; |
| 855 | off -= (entries_spanned_by_off << mr->page_shift); |
| 856 | m = entries_spanned_by_off / RVT_SEGSZ; |
| 857 | n = entries_spanned_by_off % RVT_SEGSZ; |
| 858 | } else { |
| 859 | m = 0; |
| 860 | n = 0; |
| 861 | while (off >= mr->map[m]->segs[n].length) { |
| 862 | off -= mr->map[m]->segs[n].length; |
| 863 | n++; |
| 864 | if (n >= RVT_SEGSZ) { |
| 865 | m++; |
| 866 | n = 0; |
| 867 | } |
| 868 | } |
| 869 | } |
| 870 | isge->mr = mr; |
| 871 | isge->vaddr = mr->map[m]->segs[n].vaddr + off; |
| 872 | isge->length = mr->map[m]->segs[n].length - off; |
| 873 | isge->sge_length = sge->length; |
| 874 | isge->m = m; |
| 875 | isge->n = n; |
| 876 | ok: |
| 877 | return 1; |
Mike Marciniszyn | b58fc80 | 2017-03-20 17:26:26 -0700 | [diff] [blame] | 878 | bail_unref: |
| 879 | rvt_put_mr(mr); |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 880 | bail: |
| 881 | rcu_read_unlock(); |
| 882 | return 0; |
| 883 | } |
| 884 | EXPORT_SYMBOL(rvt_lkey_ok); |
| 885 | |
| 886 | /** |
| 887 | * rvt_rkey_ok - check the IB virtual address, length, and RKEY |
| 888 | * @qp: qp for validation |
| 889 | * @sge: SGE state |
| 890 | * @len: length of data |
| 891 | * @vaddr: virtual address to place data |
| 892 | * @rkey: rkey to check |
| 893 | * @acc: access flags |
| 894 | * |
Dennis Dalessandro | 90793f7 | 2016-02-14 12:10:29 -0800 | [diff] [blame] | 895 | * Return: 1 if successful, otherwise 0. |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 896 | * |
| 897 | * increments the reference count upon success |
| 898 | */ |
| 899 | int rvt_rkey_ok(struct rvt_qp *qp, struct rvt_sge *sge, |
| 900 | u32 len, u64 vaddr, u32 rkey, int acc) |
| 901 | { |
| 902 | struct rvt_dev_info *dev = ib_to_rvt(qp->ibqp.device); |
| 903 | struct rvt_lkey_table *rkt = &dev->lkey_table; |
| 904 | struct rvt_mregion *mr; |
| 905 | unsigned n, m; |
| 906 | size_t off; |
| 907 | |
| 908 | /* |
| 909 | * We use RKEY == zero for kernel virtual addresses |
Bart Van Assche | 0bbb3b7 | 2017-01-20 13:04:37 -0800 | [diff] [blame] | 910 | * (see rvt_get_dma_mr() and dma_virt_ops). |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 911 | */ |
| 912 | rcu_read_lock(); |
| 913 | if (rkey == 0) { |
| 914 | struct rvt_pd *pd = ibpd_to_rvtpd(qp->ibqp.pd); |
| 915 | struct rvt_dev_info *rdi = ib_to_rvt(pd->ibpd.device); |
| 916 | |
| 917 | if (pd->user) |
| 918 | goto bail; |
| 919 | mr = rcu_dereference(rdi->dma_mr); |
| 920 | if (!mr) |
| 921 | goto bail; |
Sebastian Sanchez | f84dfa2 | 2016-12-07 19:33:53 -0800 | [diff] [blame] | 922 | rvt_get_mr(mr); |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 923 | rcu_read_unlock(); |
| 924 | |
| 925 | sge->mr = mr; |
| 926 | sge->vaddr = (void *)vaddr; |
| 927 | sge->length = len; |
| 928 | sge->sge_length = len; |
| 929 | sge->m = 0; |
| 930 | sge->n = 0; |
| 931 | goto ok; |
| 932 | } |
| 933 | |
Mike Marciniszyn | 99f80d2 | 2016-10-10 06:14:39 -0700 | [diff] [blame] | 934 | mr = rcu_dereference(rkt->table[rkey >> rkt->shift]); |
Mike Marciniszyn | b58fc80 | 2017-03-20 17:26:26 -0700 | [diff] [blame] | 935 | if (!mr) |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 936 | goto bail; |
Mike Marciniszyn | b58fc80 | 2017-03-20 17:26:26 -0700 | [diff] [blame] | 937 | rvt_get_mr(mr); |
| 938 | /* insure mr read is before test */ |
| 939 | if (!READ_ONCE(mr->lkey_published)) |
| 940 | goto bail_unref; |
| 941 | if (unlikely(atomic_read(&mr->lkey_invalid) || |
| 942 | mr->lkey != rkey || qp->ibqp.pd != mr->pd)) |
| 943 | goto bail_unref; |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 944 | |
| 945 | off = vaddr - mr->iova; |
| 946 | if (unlikely(vaddr < mr->iova || off + len > mr->length || |
| 947 | (mr->access_flags & acc) == 0)) |
Mike Marciniszyn | b58fc80 | 2017-03-20 17:26:26 -0700 | [diff] [blame] | 948 | goto bail_unref; |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 949 | rcu_read_unlock(); |
| 950 | |
| 951 | off += mr->offset; |
| 952 | if (mr->page_shift) { |
| 953 | /* |
| 954 | * page sizes are uniform power of 2 so no loop is necessary |
| 955 | * entries_spanned_by_off is the number of times the loop below |
| 956 | * would have executed. |
| 957 | */ |
| 958 | size_t entries_spanned_by_off; |
| 959 | |
| 960 | entries_spanned_by_off = off >> mr->page_shift; |
| 961 | off -= (entries_spanned_by_off << mr->page_shift); |
| 962 | m = entries_spanned_by_off / RVT_SEGSZ; |
| 963 | n = entries_spanned_by_off % RVT_SEGSZ; |
| 964 | } else { |
| 965 | m = 0; |
| 966 | n = 0; |
| 967 | while (off >= mr->map[m]->segs[n].length) { |
| 968 | off -= mr->map[m]->segs[n].length; |
| 969 | n++; |
| 970 | if (n >= RVT_SEGSZ) { |
| 971 | m++; |
| 972 | n = 0; |
| 973 | } |
| 974 | } |
| 975 | } |
| 976 | sge->mr = mr; |
| 977 | sge->vaddr = mr->map[m]->segs[n].vaddr + off; |
| 978 | sge->length = mr->map[m]->segs[n].length - off; |
| 979 | sge->sge_length = len; |
| 980 | sge->m = m; |
| 981 | sge->n = n; |
| 982 | ok: |
| 983 | return 1; |
Mike Marciniszyn | b58fc80 | 2017-03-20 17:26:26 -0700 | [diff] [blame] | 984 | bail_unref: |
| 985 | rvt_put_mr(mr); |
Dennis Dalessandro | 7b1e209 | 2016-01-06 10:03:31 -0800 | [diff] [blame] | 986 | bail: |
| 987 | rcu_read_unlock(); |
| 988 | return 0; |
| 989 | } |
| 990 | EXPORT_SYMBOL(rvt_rkey_ok); |