drivers/infiniband/sw/rxe/rxe_mr.c

   1 /*
   2  * Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.
   3  * Copyright (c) 2015 System Fabric Works, Inc. All rights reserved.
   4  *
   5  * This software is available to you under a choice of one of two
   6  * licenses.  You may choose to be licensed under the terms of the GNU
   7  * General Public License (GPL) Version 2, available from the file
   8  * COPYING in the main directory of this source tree, or the
   9  * OpenIB.org BSD license below:
  10  *
  11  *     Redistribution and use in source and binary forms, with or
  12  *     without modification, are permitted provided that the following
  13  *     conditions are met:
  14  *
  15  *      - Redistributions of source code must retain the above
  16  *        copyright notice, this list of conditions and the following
  17  *        disclaimer.
  18  *
  19  *      - Redistributions in binary form must reproduce the above
  20  *        copyright notice, this list of conditions and the following
  21  *        disclaimer in the documentation and/or other materials
  22  *        provided with the distribution.
  23  *
  24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  28  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  29  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  30  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  31  * SOFTWARE.
  32  */
  33
  34 #include "rxe.h"
  35 #include "rxe_loc.h"
  36
  37 /*
  38  * lfsr (linear feedback shift register) with period 255
  39  */
  40 static u8 rxe_get_key(void)
  41 {
  42         static u32 key = 1;
  43
  44         key = key << 1;
  45
  46         key |= (0 != (key & 0x100)) ^ (0 != (key & 0x10))
  47                 ^ (0 != (key & 0x80)) ^ (0 != (key & 0x40));
  48
  49         key &= 0xff;
  50
  51         return key;
  52 }
  53
  54 int mem_check_range(struct rxe_mem *mem, u64 iova, size_t length)
  55 {
  56         switch (mem->type) {
  57         case RXE_MEM_TYPE_DMA:
  58                 return 0;
  59
  60         case RXE_MEM_TYPE_MR:
  61         case RXE_MEM_TYPE_FMR:
  62                 if (iova < mem->iova ||
  63                     length > mem->length ||
  64                     iova > mem->iova + mem->length - length)
  65                         return -EFAULT;
  66                 return 0;
  67
  68         default:
  69                 return -EFAULT;
  70         }
  71 }
  72
  73 #define IB_ACCESS_REMOTE        (IB_ACCESS_REMOTE_READ          \
  74                                 | IB_ACCESS_REMOTE_WRITE        \
  75                                 | IB_ACCESS_REMOTE_ATOMIC)
  76
  77 static void rxe_mem_init(int access, struct rxe_mem *mem)
  78 {
  79         u32 lkey = mem->pelem.index << 8 | rxe_get_key();
  80         u32 rkey = (access & IB_ACCESS_REMOTE) ? lkey : 0;
  81
  82         if (mem->pelem.pool->type == RXE_TYPE_MR) {
  83                 mem->ibmr.lkey          = lkey;
  84                 mem->ibmr.rkey          = rkey;
  85         }
  86
  87         mem->lkey               = lkey;
  88         mem->rkey               = rkey;
  89         mem->state              = RXE_MEM_STATE_INVALID;
  90         mem->type               = RXE_MEM_TYPE_NONE;
  91         mem->map_shift          = ilog2(RXE_BUF_PER_MAP);
  92 }
  93
  94 void rxe_mem_cleanup(struct rxe_pool_entry *arg)
  95 {
  96         struct rxe_mem *mem = container_of(arg, typeof(*mem), pelem);
  97         int i;
  98
  99         if (mem->umem)
 100                 ib_umem_release(mem->umem);
 101
 102         if (mem->map) {
 103                 for (i = 0; i < mem->num_map; i++)
 104                         kfree(mem->map[i]);
 105
 106                 kfree(mem->map);
 107         }
 108 }
 109
 110 static int rxe_mem_alloc(struct rxe_dev *rxe, struct rxe_mem *mem, int num_buf)
 111 {
 112         int i;
 113         int num_map;
 114         struct rxe_map **map = mem->map;
 115
 116         num_map = (num_buf + RXE_BUF_PER_MAP - 1) / RXE_BUF_PER_MAP;
 117
 118         mem->map = kmalloc_array(num_map, sizeof(*map), GFP_KERNEL);
 119         if (!mem->map)
 120                 goto err1;
 121
 122         for (i = 0; i < num_map; i++) {
 123                 mem->map[i] = kmalloc(sizeof(**map), GFP_KERNEL);
 124                 if (!mem->map[i])
 125                         goto err2;
 126         }
 127
 128         BUILD_BUG_ON(!is_power_of_2(RXE_BUF_PER_MAP));
 129
 130         mem->map_shift  = ilog2(RXE_BUF_PER_MAP);
 131         mem->map_mask   = RXE_BUF_PER_MAP - 1;
 132
 133         mem->num_buf = num_buf;
 134         mem->num_map = num_map;
 135         mem->max_buf = num_map * RXE_BUF_PER_MAP;
 136
 137         return 0;
 138
 139 err2:
 140         for (i--; i >= 0; i--)
 141                 kfree(mem->map[i]);
 142
 143         kfree(mem->map);
 144 err1:
 145         return -ENOMEM;
 146 }
 147
 148 int rxe_mem_init_dma(struct rxe_dev *rxe, struct rxe_pd *pd,
 149                      int access, struct rxe_mem *mem)
 150 {
 151         rxe_mem_init(access, mem);
 152
 153         mem->pd                 = pd;
 154         mem->access             = access;
 155         mem->state              = RXE_MEM_STATE_VALID;
 156         mem->type               = RXE_MEM_TYPE_DMA;
 157
 158         return 0;
 159 }
 160
 161 int rxe_mem_init_user(struct rxe_dev *rxe, struct rxe_pd *pd, u64 start,
 162                       u64 length, u64 iova, int access, struct ib_udata *udata,
 163                       struct rxe_mem *mem)
 164 {
 165         int                     entry;
 166         struct rxe_map          **map;
 167         struct rxe_phys_buf     *buf = NULL;
 168         struct ib_umem          *umem;
 169         struct scatterlist      *sg;
 170         int                     num_buf;
 171         void                    *vaddr;
 172         int err;
 173
 174         umem = ib_umem_get(pd->ibpd.uobject->context, start, length, access, 0);
 175         if (IS_ERR(umem)) {
 176                 pr_warn("err %d from rxe_umem_get\n",
 177                         (int)PTR_ERR(umem));
 178                 err = -EINVAL;
 179                 goto err1;
 180         }
 181
 182         mem->umem = umem;
 183         num_buf = umem->nmap;
 184
 185         rxe_mem_init(access, mem);
 186
 187         err = rxe_mem_alloc(rxe, mem, num_buf);
 188         if (err) {
 189                 pr_warn("err %d from rxe_mem_alloc\n", err);
 190                 ib_umem_release(umem);
 191                 goto err1;
 192         }
 193
 194         mem->page_shift         = umem->page_shift;
 195         mem->page_mask          = BIT(umem->page_shift) - 1;
 196
 197         num_buf                 = 0;
 198         map                     = mem->map;
 199         if (length > 0) {
 200                 buf = map[0]->buf;
 201
 202                 for_each_sg(umem->sg_head.sgl, sg, umem->nmap, entry) {
 203                         vaddr = page_address(sg_page(sg));
 204                         if (!vaddr) {
 205                                 pr_warn("null vaddr\n");
 206                                 err = -ENOMEM;
 207                                 goto err1;
 208                         }
 209
 210                         buf->addr = (uintptr_t)vaddr;
 211                         buf->size = BIT(umem->page_shift);
 212                         num_buf++;
 213                         buf++;
 214
 215                         if (num_buf >= RXE_BUF_PER_MAP) {
 216                                 map++;
 217                                 buf = map[0]->buf;
 218                                 num_buf = 0;
 219                         }
 220                 }
 221         }
 222
 223         mem->pd                 = pd;
 224         mem->umem               = umem;
 225         mem->access             = access;
 226         mem->length             = length;
 227         mem->iova               = iova;
 228         mem->va                 = start;
 229         mem->offset             = ib_umem_offset(umem);
 230         mem->state              = RXE_MEM_STATE_VALID;
 231         mem->type               = RXE_MEM_TYPE_MR;
 232
 233         return 0;
 234
 235 err1:
 236         return err;
 237 }
 238
 239 int rxe_mem_init_fast(struct rxe_dev *rxe, struct rxe_pd *pd,
 240                       int max_pages, struct rxe_mem *mem)
 241 {
 242         int err;
 243
 244         rxe_mem_init(0, mem);
 245
 246         /* In fastreg, we also set the rkey */
 247         mem->ibmr.rkey = mem->ibmr.lkey;
 248
 249         err = rxe_mem_alloc(rxe, mem, max_pages);
 250         if (err)
 251                 goto err1;
 252
 253         mem->pd                 = pd;
 254         mem->max_buf            = max_pages;
 255         mem->state              = RXE_MEM_STATE_FREE;
 256         mem->type               = RXE_MEM_TYPE_MR;
 257
 258         return 0;
 259
 260 err1:
 261         return err;
 262 }
 263
 264 static void lookup_iova(
 265         struct rxe_mem  *mem,
 266         u64                     iova,
 267         int                     *m_out,
 268         int                     *n_out,
 269         size_t                  *offset_out)
 270 {
 271         size_t                  offset = iova - mem->iova + mem->offset;
 272         int                     map_index;
 273         int                     buf_index;
 274         u64                     length;
 275
 276         if (likely(mem->page_shift)) {
 277                 *offset_out = offset & mem->page_mask;
 278                 offset >>= mem->page_shift;
 279                 *n_out = offset & mem->map_mask;
 280                 *m_out = offset >> mem->map_shift;
 281         } else {
 282                 map_index = 0;
 283                 buf_index = 0;
 284
 285                 length = mem->map[map_index]->buf[buf_index].size;
 286
 287                 while (offset >= length) {
 288                         offset -= length;
 289                         buf_index++;
 290
 291                         if (buf_index == RXE_BUF_PER_MAP) {
 292                                 map_index++;
 293                                 buf_index = 0;
 294                         }
 295                         length = mem->map[map_index]->buf[buf_index].size;
 296                 }
 297
 298                 *m_out = map_index;
 299                 *n_out = buf_index;
 300                 *offset_out = offset;
 301         }
 302 }
 303
 304 void *iova_to_vaddr(struct rxe_mem *mem, u64 iova, int length)
 305 {
 306         size_t offset;
 307         int m, n;
 308         void *addr;
 309
 310         if (mem->state != RXE_MEM_STATE_VALID) {
 311                 pr_warn("mem not in valid state\n");
 312                 addr = NULL;
 313                 goto out;
 314         }
 315
 316         if (!mem->map) {
 317                 addr = (void *)(uintptr_t)iova;
 318                 goto out;
 319         }
 320
 321         if (mem_check_range(mem, iova, length)) {
 322                 pr_warn("range violation\n");
 323                 addr = NULL;
 324                 goto out;
 325         }
 326
 327         lookup_iova(mem, iova, &m, &n, &offset);
 328
 329         if (offset + length > mem->map[m]->buf[n].size) {
 330                 pr_warn("crosses page boundary\n");
 331                 addr = NULL;
 332                 goto out;
 333         }
 334
 335         addr = (void *)(uintptr_t)mem->map[m]->buf[n].addr + offset;
 336
 337 out:
 338         return addr;
 339 }
 340
 341 /* copy data from a range (vaddr, vaddr+length-1) to or from
 342  * a mem object starting at iova. Compute incremental value of
 343  * crc32 if crcp is not zero. caller must hold a reference to mem
 344  */
 345 int rxe_mem_copy(struct rxe_mem *mem, u64 iova, void *addr, int length,
 346                  enum copy_direction dir, u32 *crcp)
 347 {
 348         int                     err;
 349         int                     bytes;
 350         u8                      *va;
 351         struct rxe_map          **map;
 352         struct rxe_phys_buf     *buf;
 353         int                     m;
 354         int                     i;
 355         size_t                  offset;
 356         u32                     crc = crcp ? (*crcp) : 0;
 357
 358         if (length == 0)
 359                 return 0;
 360
 361         if (mem->type == RXE_MEM_TYPE_DMA) {
 362                 u8 *src, *dest;
 363
 364                 src  = (dir == to_mem_obj) ?
 365                         addr : ((void *)(uintptr_t)iova);
 366
 367                 dest = (dir == to_mem_obj) ?
 368                         ((void *)(uintptr_t)iova) : addr;
 369
 370                 memcpy(dest, src, length);
 371
 372                 if (crcp)
 373                         *crcp = rxe_crc32(to_rdev(mem->pd->ibpd.device),
 374                                         *crcp, dest, length);
 375
 376                 return 0;
 377         }
 378
 379         WARN_ON_ONCE(!mem->map);
 380
 381         err = mem_check_range(mem, iova, length);
 382         if (err) {
 383                 err = -EFAULT;
 384                 goto err1;
 385         }
 386
 387         lookup_iova(mem, iova, &m, &i, &offset);
 388
 389         map     = mem->map + m;
 390         buf     = map[0]->buf + i;
 391
 392         while (length > 0) {
 393                 u8 *src, *dest;
 394
 395                 va      = (u8 *)(uintptr_t)buf->addr + offset;
 396                 src  = (dir == to_mem_obj) ? addr : va;
 397                 dest = (dir == to_mem_obj) ? va : addr;
 398
 399                 bytes   = buf->size - offset;
 400
 401                 if (bytes > length)
 402                         bytes = length;
 403
 404                 memcpy(dest, src, bytes);
 405
 406                 if (crcp)
 407                         crc = rxe_crc32(to_rdev(mem->pd->ibpd.device),
 408                                         crc, dest, bytes);
 409
 410                 length  -= bytes;
 411                 addr    += bytes;
 412
 413                 offset  = 0;
 414                 buf++;
 415                 i++;
 416
 417                 if (i == RXE_BUF_PER_MAP) {
 418                         i = 0;
 419                         map++;
 420                         buf = map[0]->buf;
 421                 }
 422         }
 423
 424         if (crcp)
 425                 *crcp = crc;
 426
 427         return 0;
 428
 429 err1:
 430         return err;
 431 }
 432
 433 /* copy data in or out of a wqe, i.e. sg list
 434  * under the control of a dma descriptor
 435  */
 436 int copy_data(
 437         struct rxe_dev          *rxe,
 438         struct rxe_pd           *pd,
 439         int                     access,
 440         struct rxe_dma_info     *dma,
 441         void                    *addr,
 442         int                     length,
 443         enum copy_direction     dir,
 444         u32                     *crcp)
 445 {
 446         int                     bytes;
 447         struct rxe_sge          *sge    = &dma->sge[dma->cur_sge];
 448         int                     offset  = dma->sge_offset;
 449         int                     resid   = dma->resid;
 450         struct rxe_mem          *mem    = NULL;
 451         u64                     iova;
 452         int                     err;
 453
 454         if (length == 0)
 455                 return 0;
 456
 457         if (length > resid) {
 458                 err = -EINVAL;
 459                 goto err2;
 460         }
 461
 462         if (sge->length && (offset < sge->length)) {
 463                 mem = lookup_mem(pd, access, sge->lkey, lookup_local);
 464                 if (!mem) {
 465                         err = -EINVAL;
 466                         goto err1;
 467                 }
 468         }
 469
 470         while (length > 0) {
 471                 bytes = length;
 472
 473                 if (offset >= sge->length) {
 474                         if (mem) {
 475                                 rxe_drop_ref(mem);
 476                                 mem = NULL;
 477                         }
 478                         sge++;
 479                         dma->cur_sge++;
 480                         offset = 0;
 481
 482                         if (dma->cur_sge >= dma->num_sge) {
 483                                 err = -ENOSPC;
 484                                 goto err2;
 485                         }
 486
 487                         if (sge->length) {
 488                                 mem = lookup_mem(pd, access, sge->lkey,
 489                                                  lookup_local);
 490                                 if (!mem) {
 491                                         err = -EINVAL;
 492                                         goto err1;
 493                                 }
 494                         } else {
 495                                 continue;
 496                         }
 497                 }
 498
 499                 if (bytes > sge->length - offset)
 500                         bytes = sge->length - offset;
 501
 502                 if (bytes > 0) {
 503                         iova = sge->addr + offset;
 504
 505                         err = rxe_mem_copy(mem, iova, addr, bytes, dir, crcp);
 506                         if (err)
 507                                 goto err2;
 508
 509                         offset  += bytes;
 510                         resid   -= bytes;
 511                         length  -= bytes;
 512                         addr    += bytes;
 513                 }
 514         }
 515
 516         dma->sge_offset = offset;
 517         dma->resid      = resid;
 518
 519         if (mem)
 520                 rxe_drop_ref(mem);
 521
 522         return 0;
 523
 524 err2:
 525         if (mem)
 526                 rxe_drop_ref(mem);
 527 err1:
 528         return err;
 529 }
 530
 531 int advance_dma_data(struct rxe_dma_info *dma, unsigned int length)
 532 {
 533         struct rxe_sge          *sge    = &dma->sge[dma->cur_sge];
 534         int                     offset  = dma->sge_offset;
 535         int                     resid   = dma->resid;
 536
 537         while (length) {
 538                 unsigned int bytes;
 539
 540                 if (offset >= sge->length) {
 541                         sge++;
 542                         dma->cur_sge++;
 543                         offset = 0;
 544                         if (dma->cur_sge >= dma->num_sge)
 545                                 return -ENOSPC;
 546                 }
 547
 548                 bytes = length;
 549
 550                 if (bytes > sge->length - offset)
 551                         bytes = sge->length - offset;
 552
 553                 offset  += bytes;
 554                 resid   -= bytes;
 555                 length  -= bytes;
 556         }
 557
 558         dma->sge_offset = offset;
 559         dma->resid      = resid;
 560
 561         return 0;
 562 }
 563
 564 /* (1) find the mem (mr or mw) corresponding to lkey/rkey
 565  *     depending on lookup_type
 566  * (2) verify that the (qp) pd matches the mem pd
 567  * (3) verify that the mem can support the requested access
 568  * (4) verify that mem state is valid
 569  */
 570 struct rxe_mem *lookup_mem(struct rxe_pd *pd, int access, u32 key,
 571                            enum lookup_type type)
 572 {
 573         struct rxe_mem *mem;
 574         struct rxe_dev *rxe = to_rdev(pd->ibpd.device);
 575         int index = key >> 8;
 576
 577         if (index >= RXE_MIN_MR_INDEX && index <= RXE_MAX_MR_INDEX) {
 578                 mem = rxe_pool_get_index(&rxe->mr_pool, index);
 579                 if (!mem)
 580                         goto err1;
 581         } else {
 582                 goto err1;
 583         }
 584
 585         if ((type == lookup_local && mem->lkey != key) ||
 586             (type == lookup_remote && mem->rkey != key))
 587                 goto err2;
 588
 589         if (mem->pd != pd)
 590                 goto err2;
 591
 592         if (access && !(access & mem->access))
 593                 goto err2;
 594
 595         if (mem->state != RXE_MEM_STATE_VALID)
 596                 goto err2;
 597
 598         return mem;
 599
 600 err2:
 601         rxe_drop_ref(mem);
 602 err1:
 603         return NULL;
 604 }
 605
 606 int rxe_mem_map_pages(struct rxe_dev *rxe, struct rxe_mem *mem,
 607                       u64 *page, int num_pages, u64 iova)
 608 {
 609         int i;
 610         int num_buf;
 611         int err;
 612         struct rxe_map **map;
 613         struct rxe_phys_buf *buf;
 614         int page_size;
 615
 616         if (num_pages > mem->max_buf) {
 617                 err = -EINVAL;
 618                 goto err1;
 619         }
 620
 621         num_buf         = 0;
 622         page_size       = 1 << mem->page_shift;
 623         map             = mem->map;
 624         buf             = map[0]->buf;
 625
 626         for (i = 0; i < num_pages; i++) {
 627                 buf->addr = *page++;
 628                 buf->size = page_size;
 629                 buf++;
 630                 num_buf++;
 631
 632                 if (num_buf == RXE_BUF_PER_MAP) {
 633                         map++;
 634                         buf = map[0]->buf;
 635                         num_buf = 0;
 636                 }
 637         }
 638
 639         mem->iova       = iova;
 640         mem->va         = iova;
 641         mem->length     = num_pages << mem->page_shift;
 642         mem->state      = RXE_MEM_STATE_VALID;
 643
 644         return 0;
 645
 646 err1:
 647         return err;
 648 }