drivers/infiniband/sw/rxe/rxe

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
rxe_get_key
mem_check_range
rxe_mem_init
rxe_mem_cleanup
rxe_mem_alloc
rxe_mem_init_dma
rxe_mem_init_user
rxe_mem_init_fast
lookup_iova
iova_to_vaddr
rxe_mem_copy
copy_data
advance_dma_data
lookup_mem
rxe_mem_map_pages
   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         ib_umem_release(mem->umem);
 100 
 101         if (mem->map) {
 102                 for (i = 0; i < mem->num_map; i++)
 103                         kfree(mem->map[i]);
 104 
 105                 kfree(mem->map);
 106         }
 107 }
 108 
 109 static int rxe_mem_alloc(struct rxe_mem *mem, int num_buf)
 110 {
 111         int i;
 112         int num_map;
 113         struct rxe_map **map = mem->map;
 114 
 115         num_map = (num_buf + RXE_BUF_PER_MAP - 1) / RXE_BUF_PER_MAP;
 116 
 117         mem->map = kmalloc_array(num_map, sizeof(*map), GFP_KERNEL);
 118         if (!mem->map)
 119                 goto err1;
 120 
 121         for (i = 0; i < num_map; i++) {
 122                 mem->map[i] = kmalloc(sizeof(**map), GFP_KERNEL);
 123                 if (!mem->map[i])
 124                         goto err2;
 125         }
 126 
 127         BUILD_BUG_ON(!is_power_of_2(RXE_BUF_PER_MAP));
 128 
 129         mem->map_shift  = ilog2(RXE_BUF_PER_MAP);
 130         mem->map_mask   = RXE_BUF_PER_MAP - 1;
 131 
 132         mem->num_buf = num_buf;
 133         mem->num_map = num_map;
 134         mem->max_buf = num_map * RXE_BUF_PER_MAP;
 135 
 136         return 0;
 137 
 138 err2:
 139         for (i--; i >= 0; i--)
 140                 kfree(mem->map[i]);
 141 
 142         kfree(mem->map);
 143 err1:
 144         return -ENOMEM;
 145 }
 146 
 147 int rxe_mem_init_dma(struct rxe_pd *pd,
 148                      int access, struct rxe_mem *mem)
 149 {
 150         rxe_mem_init(access, mem);
 151 
 152         mem->pd                 = pd;
 153         mem->access             = access;
 154         mem->state              = RXE_MEM_STATE_VALID;
 155         mem->type               = RXE_MEM_TYPE_DMA;
 156 
 157         return 0;
 158 }
 159 
 160 int rxe_mem_init_user(struct rxe_pd *pd, u64 start,
 161                       u64 length, u64 iova, int access, struct ib_udata *udata,
 162                       struct rxe_mem *mem)
 163 {
 164         struct rxe_map          **map;
 165         struct rxe_phys_buf     *buf = NULL;
 166         struct ib_umem          *umem;
 167         struct sg_page_iter     sg_iter;
 168         int                     num_buf;
 169         void                    *vaddr;
 170         int err;
 171 
 172         umem = ib_umem_get(udata, start, length, access, 0);
 173         if (IS_ERR(umem)) {
 174                 pr_warn("err %d from rxe_umem_get\n",
 175                         (int)PTR_ERR(umem));
 176                 err = -EINVAL;
 177                 goto err1;
 178         }
 179 
 180         mem->umem = umem;
 181         num_buf = ib_umem_num_pages(umem);
 182 
 183         rxe_mem_init(access, mem);
 184 
 185         err = rxe_mem_alloc(mem, num_buf);
 186         if (err) {
 187                 pr_warn("err %d from rxe_mem_alloc\n", err);
 188                 ib_umem_release(umem);
 189                 goto err1;
 190         }
 191 
 192         mem->page_shift         = PAGE_SHIFT;
 193         mem->page_mask = PAGE_SIZE - 1;
 194 
 195         num_buf                 = 0;
 196         map                     = mem->map;
 197         if (length > 0) {
 198                 buf = map[0]->buf;
 199 
 200                 for_each_sg_page(umem->sg_head.sgl, &sg_iter, umem->nmap, 0) {
 201                         if (num_buf >= RXE_BUF_PER_MAP) {
 202                                 map++;
 203                                 buf = map[0]->buf;
 204                                 num_buf = 0;
 205                         }
 206 
 207                         vaddr = page_address(sg_page_iter_page(&sg_iter));
 208                         if (!vaddr) {
 209                                 pr_warn("null vaddr\n");
 210                                 err = -ENOMEM;
 211                                 goto err1;
 212                         }
 213 
 214                         buf->addr = (uintptr_t)vaddr;
 215                         buf->size = PAGE_SIZE;
 216                         num_buf++;
 217                         buf++;
 218 
 219                 }
 220         }
 221 
 222         mem->pd                 = pd;
 223         mem->umem               = umem;
 224         mem->access             = access;
 225         mem->length             = length;
 226         mem->iova               = iova;
 227         mem->va                 = start;
 228         mem->offset             = ib_umem_offset(umem);
 229         mem->state              = RXE_MEM_STATE_VALID;
 230         mem->type               = RXE_MEM_TYPE_MR;
 231 
 232         return 0;
 233 
 234 err1:
 235         return err;
 236 }
 237 
 238 int rxe_mem_init_fast(struct rxe_pd *pd,
 239                       int max_pages, struct rxe_mem *mem)
 240 {
 241         int err;
 242 
 243         rxe_mem_init(0, mem);
 244 
 245         /* In fastreg, we also set the rkey */
 246         mem->ibmr.rkey = mem->ibmr.lkey;
 247 
 248         err = rxe_mem_alloc(mem, max_pages);
 249         if (err)
 250                 goto err1;
 251 
 252         mem->pd                 = pd;
 253         mem->max_buf            = max_pages;
 254         mem->state              = RXE_MEM_STATE_FREE;
 255         mem->type               = RXE_MEM_TYPE_MR;
 256 
 257         return 0;
 258 
 259 err1:
 260         return err;
 261 }
 262 
 263 static void lookup_iova(
 264         struct rxe_mem  *mem,
 265         u64                     iova,
 266         int                     *m_out,
 267         int                     *n_out,
 268         size_t                  *offset_out)
 269 {
 270         size_t                  offset = iova - mem->iova + mem->offset;
 271         int                     map_index;
 272         int                     buf_index;
 273         u64                     length;
 274 
 275         if (likely(mem->page_shift)) {
 276                 *offset_out = offset & mem->page_mask;
 277                 offset >>= mem->page_shift;
 278                 *n_out = offset & mem->map_mask;
 279                 *m_out = offset >> mem->map_shift;
 280         } else {
 281                 map_index = 0;
 282                 buf_index = 0;
 283 
 284                 length = mem->map[map_index]->buf[buf_index].size;
 285 
 286                 while (offset >= length) {
 287                         offset -= length;
 288                         buf_index++;
 289 
 290                         if (buf_index == RXE_BUF_PER_MAP) {
 291                                 map_index++;
 292                                 buf_index = 0;
 293                         }
 294                         length = mem->map[map_index]->buf[buf_index].size;
 295                 }
 296 
 297                 *m_out = map_index;
 298                 *n_out = buf_index;
 299                 *offset_out = offset;
 300         }
 301 }
 302 
 303 void *iova_to_vaddr(struct rxe_mem *mem, u64 iova, int length)
 304 {
 305         size_t offset;
 306         int m, n;
 307         void *addr;
 308 
 309         if (mem->state != RXE_MEM_STATE_VALID) {
 310                 pr_warn("mem not in valid state\n");
 311                 addr = NULL;
 312                 goto out;
 313         }
 314 
 315         if (!mem->map) {
 316                 addr = (void *)(uintptr_t)iova;
 317                 goto out;
 318         }
 319 
 320         if (mem_check_range(mem, iova, length)) {
 321                 pr_warn("range violation\n");
 322                 addr = NULL;
 323                 goto out;
 324         }
 325 
 326         lookup_iova(mem, iova, &m, &n, &offset);
 327 
 328         if (offset + length > mem->map[m]->buf[n].size) {
 329                 pr_warn("crosses page boundary\n");
 330                 addr = NULL;
 331                 goto out;
 332         }
 333 
 334         addr = (void *)(uintptr_t)mem->map[m]->buf[n].addr + offset;
 335 
 336 out:
 337         return addr;
 338 }
 339 
 340 /* copy data from a range (vaddr, vaddr+length-1) to or from
 341  * a mem object starting at iova. Compute incremental value of
 342  * crc32 if crcp is not zero. caller must hold a reference to mem
 343  */
 344 int rxe_mem_copy(struct rxe_mem *mem, u64 iova, void *addr, int length,
 345                  enum copy_direction dir, u32 *crcp)
 346 {
 347         int                     err;
 348         int                     bytes;
 349         u8                      *va;
 350         struct rxe_map          **map;
 351         struct rxe_phys_buf     *buf;
 352         int                     m;
 353         int                     i;
 354         size_t                  offset;
 355         u32                     crc = crcp ? (*crcp) : 0;
 356 
 357         if (length == 0)
 358                 return 0;
 359 
 360         if (mem->type == RXE_MEM_TYPE_DMA) {
 361                 u8 *src, *dest;
 362 
 363                 src  = (dir == to_mem_obj) ?
 364                         addr : ((void *)(uintptr_t)iova);
 365 
 366                 dest = (dir == to_mem_obj) ?
 367                         ((void *)(uintptr_t)iova) : addr;
 368 
 369                 memcpy(dest, src, length);
 370 
 371                 if (crcp)
 372                         *crcp = rxe_crc32(to_rdev(mem->pd->ibpd.device),
 373                                         *crcp, dest, length);
 374 
 375                 return 0;
 376         }
 377 
 378         WARN_ON_ONCE(!mem->map);
 379 
 380         err = mem_check_range(mem, iova, length);
 381         if (err) {
 382                 err = -EFAULT;
 383                 goto err1;
 384         }
 385 
 386         lookup_iova(mem, iova, &m, &i, &offset);
 387 
 388         map     = mem->map + m;
 389         buf     = map[0]->buf + i;
 390 
 391         while (length > 0) {
 392                 u8 *src, *dest;
 393 
 394                 va      = (u8 *)(uintptr_t)buf->addr + offset;
 395                 src  = (dir == to_mem_obj) ? addr : va;
 396                 dest = (dir == to_mem_obj) ? va : addr;
 397 
 398                 bytes   = buf->size - offset;
 399 
 400                 if (bytes > length)
 401                         bytes = length;
 402 
 403                 memcpy(dest, src, bytes);
 404 
 405                 if (crcp)
 406                         crc = rxe_crc32(to_rdev(mem->pd->ibpd.device),
 407                                         crc, dest, bytes);
 408 
 409                 length  -= bytes;
 410                 addr    += bytes;
 411 
 412                 offset  = 0;
 413                 buf++;
 414                 i++;
 415 
 416                 if (i == RXE_BUF_PER_MAP) {
 417                         i = 0;
 418                         map++;
 419                         buf = map[0]->buf;
 420                 }
 421         }
 422 
 423         if (crcp)
 424                 *crcp = crc;
 425 
 426         return 0;
 427 
 428 err1:
 429         return err;
 430 }
 431 
 432 /* copy data in or out of a wqe, i.e. sg list
 433  * under the control of a dma descriptor
 434  */
 435 int copy_data(
 436         struct rxe_pd           *pd,
 437         int                     access,
 438         struct rxe_dma_info     *dma,
 439         void                    *addr,
 440         int                     length,
 441         enum copy_direction     dir,
 442         u32                     *crcp)
 443 {
 444         int                     bytes;
 445         struct rxe_sge          *sge    = &dma->sge[dma->cur_sge];
 446         int                     offset  = dma->sge_offset;
 447         int                     resid   = dma->resid;
 448         struct rxe_mem          *mem    = NULL;
 449         u64                     iova;
 450         int                     err;
 451 
 452         if (length == 0)
 453                 return 0;
 454 
 455         if (length > resid) {
 456                 err = -EINVAL;
 457                 goto err2;
 458         }
 459 
 460         if (sge->length && (offset < sge->length)) {
 461                 mem = lookup_mem(pd, access, sge->lkey, lookup_local);
 462                 if (!mem) {
 463                         err = -EINVAL;
 464                         goto err1;
 465                 }
 466         }
 467 
 468         while (length > 0) {
 469                 bytes = length;
 470 
 471                 if (offset >= sge->length) {
 472                         if (mem) {
 473                                 rxe_drop_ref(mem);
 474                                 mem = NULL;
 475                         }
 476                         sge++;
 477                         dma->cur_sge++;
 478                         offset = 0;
 479 
 480                         if (dma->cur_sge >= dma->num_sge) {
 481                                 err = -ENOSPC;
 482                                 goto err2;
 483                         }
 484 
 485                         if (sge->length) {
 486                                 mem = lookup_mem(pd, access, sge->lkey,
 487                                                  lookup_local);
 488                                 if (!mem) {
 489                                         err = -EINVAL;
 490                                         goto err1;
 491                                 }
 492                         } else {
 493                                 continue;
 494                         }
 495                 }
 496 
 497                 if (bytes > sge->length - offset)
 498                         bytes = sge->length - offset;
 499 
 500                 if (bytes > 0) {
 501                         iova = sge->addr + offset;
 502 
 503                         err = rxe_mem_copy(mem, iova, addr, bytes, dir, crcp);
 504                         if (err)
 505                                 goto err2;
 506 
 507                         offset  += bytes;
 508                         resid   -= bytes;
 509                         length  -= bytes;
 510                         addr    += bytes;
 511                 }
 512         }
 513 
 514         dma->sge_offset = offset;
 515         dma->resid      = resid;
 516 
 517         if (mem)
 518                 rxe_drop_ref(mem);
 519 
 520         return 0;
 521 
 522 err2:
 523         if (mem)
 524                 rxe_drop_ref(mem);
 525 err1:
 526         return err;
 527 }
 528 
 529 int advance_dma_data(struct rxe_dma_info *dma, unsigned int length)
 530 {
 531         struct rxe_sge          *sge    = &dma->sge[dma->cur_sge];
 532         int                     offset  = dma->sge_offset;
 533         int                     resid   = dma->resid;
 534 
 535         while (length) {
 536                 unsigned int bytes;
 537 
 538                 if (offset >= sge->length) {
 539                         sge++;
 540                         dma->cur_sge++;
 541                         offset = 0;
 542                         if (dma->cur_sge >= dma->num_sge)
 543                                 return -ENOSPC;
 544                 }
 545 
 546                 bytes = length;
 547 
 548                 if (bytes > sge->length - offset)
 549                         bytes = sge->length - offset;
 550 
 551                 offset  += bytes;
 552                 resid   -= bytes;
 553                 length  -= bytes;
 554         }
 555 
 556         dma->sge_offset = offset;
 557         dma->resid      = resid;
 558 
 559         return 0;
 560 }
 561 
 562 /* (1) find the mem (mr or mw) corresponding to lkey/rkey
 563  *     depending on lookup_type
 564  * (2) verify that the (qp) pd matches the mem pd
 565  * (3) verify that the mem can support the requested access
 566  * (4) verify that mem state is valid
 567  */
 568 struct rxe_mem *lookup_mem(struct rxe_pd *pd, int access, u32 key,
 569                            enum lookup_type type)
 570 {
 571         struct rxe_mem *mem;
 572         struct rxe_dev *rxe = to_rdev(pd->ibpd.device);
 573         int index = key >> 8;
 574 
 575         mem = rxe_pool_get_index(&rxe->mr_pool, index);
 576         if (!mem)
 577                 return NULL;
 578 
 579         if (unlikely((type == lookup_local && mem->lkey != key) ||
 580                      (type == lookup_remote && mem->rkey != key) ||
 581                      mem->pd != pd ||
 582                      (access && !(access & mem->access)) ||
 583                      mem->state != RXE_MEM_STATE_VALID)) {
 584                 rxe_drop_ref(mem);
 585                 mem = NULL;
 586         }
 587 
 588         return mem;
 589 }
 590 
 591 int rxe_mem_map_pages(struct rxe_dev *rxe, struct rxe_mem *mem,
 592                       u64 *page, int num_pages, u64 iova)
 593 {
 594         int i;
 595         int num_buf;
 596         int err;
 597         struct rxe_map **map;
 598         struct rxe_phys_buf *buf;
 599         int page_size;
 600 
 601         if (num_pages > mem->max_buf) {
 602                 err = -EINVAL;
 603                 goto err1;
 604         }
 605 
 606         num_buf         = 0;
 607         page_size       = 1 << mem->page_shift;
 608         map             = mem->map;
 609         buf             = map[0]->buf;
 610 
 611         for (i = 0; i < num_pages; i++) {
 612                 buf->addr = *page++;
 613                 buf->size = page_size;
 614                 buf++;
 615                 num_buf++;
 616 
 617                 if (num_buf == RXE_BUF_PER_MAP) {
 618                         map++;
 619                         buf = map[0]->buf;
 620                         num_buf = 0;
 621                 }
 622         }
 623 
 624         mem->iova       = iova;
 625         mem->va         = iova;
 626         mem->length     = num_pages << mem->page_shift;
 627         mem->state      = RXE_MEM_STATE_VALID;
 628 
 629         return 0;
 630 
 631 err1:
 632         return err;
 633 }
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/infiniband/sw/rxe/rxe_mr.c

DEFINITIONS
