drivers/net/mlx4/mr.c

   1 /*
   2  * Copyright (c) 2004 Topspin Communications.  All rights reserved.
   3  * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
   4  * Copyright (c) 2006, 2007 Cisco Systems, Inc.  All rights reserved.
   5  *
   6  * This software is available to you under a choice of one of two
   7  * licenses.  You may choose to be licensed under the terms of the GNU
   8  * General Public License (GPL) Version 2, available from the file
   9  * COPYING in the main directory of this source tree, or the
  10  * OpenIB.org BSD license below:
  11  *
  12  *     Redistribution and use in source and binary forms, with or
  13  *     without modification, are permitted provided that the following
  14  *     conditions are met:
  15  *
  16  *      - Redistributions of source code must retain the above
  17  *        copyright notice, this list of conditions and the following
  18  *        disclaimer.
  19  *
  20  *      - Redistributions in binary form must reproduce the above
  21  *        copyright notice, this list of conditions and the following
  22  *        disclaimer in the documentation and/or other materials
  23  *        provided with the distribution.
  24  *
  25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  26  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  27  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  28  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  29  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  30  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  31  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  32  * SOFTWARE.
  33  */
  34
  35 #include <linux/init.h>
  36 #include <linux/errno.h>
  37
  38 #include <linux/mlx4/cmd.h>
  39
  40 #include "mlx4.h"
  41 #include "icm.h"
  42
  43 /*
  44  * Must be packed because mtt_seg is 64 bits but only aligned to 32 bits.
  45  */
  46 struct mlx4_mpt_entry {
  47         __be32 flags;
  48         __be32 qpn;
  49         __be32 key;
  50         __be32 pd;
  51         __be64 start;
  52         __be64 length;
  53         __be32 lkey;
  54         __be32 win_cnt;
  55         u8      reserved1[3];
  56         u8      mtt_rep;
  57         __be64 mtt_seg;
  58         __be32 mtt_sz;
  59         __be32 entity_size;
  60         __be32 first_byte_offset;
  61 } __attribute__((packed));
  62
  63 #define MLX4_MPT_FLAG_SW_OWNS       (0xfUL << 28)
  64 #define MLX4_MPT_FLAG_MIO           (1 << 17)
  65 #define MLX4_MPT_FLAG_BIND_ENABLE   (1 << 15)
  66 #define MLX4_MPT_FLAG_PHYSICAL      (1 <<  9)
  67 #define MLX4_MPT_FLAG_REGION        (1 <<  8)
  68
  69 #define MLX4_MTT_FLAG_PRESENT           1
  70
  71 #define MLX4_MPT_STATUS_SW              0xF0
  72 #define MLX4_MPT_STATUS_HW              0x00
  73
  74 static u32 mlx4_buddy_alloc(struct mlx4_buddy *buddy, int order)
  75 {
  76         int o;
  77         int m;
  78         u32 seg;
  79
  80         spin_lock(&buddy->lock);
  81
  82         for (o = order; o <= buddy->max_order; ++o) {
  83                 m = 1 << (buddy->max_order - o);
  84                 seg = find_first_bit(buddy->bits[o], m);
  85                 if (seg < m)
  86                         goto found;
  87         }
  88
  89         spin_unlock(&buddy->lock);
  90         return -1;
  91
  92  found:
  93         clear_bit(seg, buddy->bits[o]);
  94
  95         while (o > order) {
  96                 --o;
  97                 seg <<= 1;
  98                 set_bit(seg ^ 1, buddy->bits[o]);
  99         }
 100
 101         spin_unlock(&buddy->lock);
 102
 103         seg <<= order;
 104
 105         return seg;
 106 }
 107
 108 static void mlx4_buddy_free(struct mlx4_buddy *buddy, u32 seg, int order)
 109 {
 110         seg >>= order;
 111
 112         spin_lock(&buddy->lock);
 113
 114         while (test_bit(seg ^ 1, buddy->bits[order])) {
 115                 clear_bit(seg ^ 1, buddy->bits[order]);
 116                 seg >>= 1;
 117                 ++order;
 118         }
 119
 120         set_bit(seg, buddy->bits[order]);
 121
 122         spin_unlock(&buddy->lock);
 123 }
 124
 125 static int mlx4_buddy_init(struct mlx4_buddy *buddy, int max_order)
 126 {
 127         int i, s;
 128
 129         buddy->max_order = max_order;
 130         spin_lock_init(&buddy->lock);
 131
 132         buddy->bits = kzalloc((buddy->max_order + 1) * sizeof (long *),
 133                               GFP_KERNEL);
 134         if (!buddy->bits)
 135                 goto err_out;
 136
 137         for (i = 0; i <= buddy->max_order; ++i) {
 138                 s = BITS_TO_LONGS(1 << (buddy->max_order - i));
 139                 buddy->bits[i] = kmalloc(s * sizeof (long), GFP_KERNEL);
 140                 if (!buddy->bits[i])
 141                         goto err_out_free;
 142                 bitmap_zero(buddy->bits[i], 1 << (buddy->max_order - i));
 143         }
 144
 145         set_bit(0, buddy->bits[buddy->max_order]);
 146
 147         return 0;
 148
 149 err_out_free:
 150         for (i = 0; i <= buddy->max_order; ++i)
 151                 kfree(buddy->bits[i]);
 152
 153         kfree(buddy->bits);
 154
 155 err_out:
 156         return -ENOMEM;
 157 }
 158
 159 static void mlx4_buddy_cleanup(struct mlx4_buddy *buddy)
 160 {
 161         int i;
 162
 163         for (i = 0; i <= buddy->max_order; ++i)
 164                 kfree(buddy->bits[i]);
 165
 166         kfree(buddy->bits);
 167 }
 168
 169 static u32 mlx4_alloc_mtt_range(struct mlx4_dev *dev, int order)
 170 {
 171         struct mlx4_mr_table *mr_table = &mlx4_priv(dev)->mr_table;
 172         u32 seg;
 173
 174         seg = mlx4_buddy_alloc(&mr_table->mtt_buddy, order);
 175         if (seg == -1)
 176                 return -1;
 177
 178         if (mlx4_table_get_range(dev, &mr_table->mtt_table, seg,
 179                                  seg + (1 << order) - 1)) {
 180                 mlx4_buddy_free(&mr_table->mtt_buddy, seg, order);
 181                 return -1;
 182         }
 183
 184         return seg;
 185 }
 186
 187 int mlx4_mtt_init(struct mlx4_dev *dev, int npages, int page_shift,
 188                   struct mlx4_mtt *mtt)
 189 {
 190         int i;
 191
 192         if (!npages) {
 193                 mtt->order      = -1;
 194                 mtt->page_shift = MLX4_ICM_PAGE_SHIFT;
 195                 return 0;
 196         } else
 197                 mtt->page_shift = page_shift;
 198
 199         for (mtt->order = 0, i = MLX4_MTT_ENTRY_PER_SEG; i < npages; i <<= 1)
 200                 ++mtt->order;
 201
 202         mtt->first_seg = mlx4_alloc_mtt_range(dev, mtt->order);
 203         if (mtt->first_seg == -1)
 204                 return -ENOMEM;
 205
 206         return 0;
 207 }
 208 EXPORT_SYMBOL_GPL(mlx4_mtt_init);
 209
 210 void mlx4_mtt_cleanup(struct mlx4_dev *dev, struct mlx4_mtt *mtt)
 211 {
 212         struct mlx4_mr_table *mr_table = &mlx4_priv(dev)->mr_table;
 213
 214         if (mtt->order < 0)
 215                 return;
 216
 217         mlx4_buddy_free(&mr_table->mtt_buddy, mtt->first_seg, mtt->order);
 218         mlx4_table_put_range(dev, &mr_table->mtt_table, mtt->first_seg,
 219                              mtt->first_seg + (1 << mtt->order) - 1);
 220 }
 221 EXPORT_SYMBOL_GPL(mlx4_mtt_cleanup);
 222
 223 u64 mlx4_mtt_addr(struct mlx4_dev *dev, struct mlx4_mtt *mtt)
 224 {
 225         return (u64) mtt->first_seg * dev->caps.mtt_entry_sz;
 226 }
 227 EXPORT_SYMBOL_GPL(mlx4_mtt_addr);
 228
 229 static u32 hw_index_to_key(u32 ind)
 230 {
 231         return (ind >> 24) | (ind << 8);
 232 }
 233
 234 static u32 key_to_hw_index(u32 key)
 235 {
 236         return (key << 24) | (key >> 8);
 237 }
 238
 239 static int mlx4_SW2HW_MPT(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox,
 240                           int mpt_index)
 241 {
 242         return mlx4_cmd(dev, mailbox->dma, mpt_index, 0, MLX4_CMD_SW2HW_MPT,
 243                         MLX4_CMD_TIME_CLASS_B);
 244 }
 245
 246 static int mlx4_HW2SW_MPT(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox,
 247                           int mpt_index)
 248 {
 249         return mlx4_cmd_box(dev, 0, mailbox ? mailbox->dma : 0, mpt_index,
 250                             !mailbox, MLX4_CMD_HW2SW_MPT, MLX4_CMD_TIME_CLASS_B);
 251 }
 252
 253 int mlx4_mr_alloc(struct mlx4_dev *dev, u32 pd, u64 iova, u64 size, u32 access,
 254                   int npages, int page_shift, struct mlx4_mr *mr)
 255 {
 256         struct mlx4_priv *priv = mlx4_priv(dev);
 257         u32 index;
 258         int err;
 259
 260         index = mlx4_bitmap_alloc(&priv->mr_table.mpt_bitmap);
 261         if (index == -1)
 262                 return -ENOMEM;
 263
 264         mr->iova       = iova;
 265         mr->size       = size;
 266         mr->pd         = pd;
 267         mr->access     = access;
 268         mr->enabled    = 0;
 269         mr->key        = hw_index_to_key(index);
 270
 271         err = mlx4_mtt_init(dev, npages, page_shift, &mr->mtt);
 272         if (err)
 273                 mlx4_bitmap_free(&priv->mr_table.mpt_bitmap, index);
 274
 275         return err;
 276 }
 277 EXPORT_SYMBOL_GPL(mlx4_mr_alloc);
 278
 279 void mlx4_mr_free(struct mlx4_dev *dev, struct mlx4_mr *mr)
 280 {
 281         struct mlx4_priv *priv = mlx4_priv(dev);
 282         int err;
 283
 284         if (mr->enabled) {
 285                 err = mlx4_HW2SW_MPT(dev, NULL,
 286                                      key_to_hw_index(mr->key) &
 287                                      (dev->caps.num_mpts - 1));
 288                 if (err)
 289                         mlx4_warn(dev, "HW2SW_MPT failed (%d)\n", err);
 290         }
 291
 292         mlx4_mtt_cleanup(dev, &mr->mtt);
 293         mlx4_bitmap_free(&priv->mr_table.mpt_bitmap, key_to_hw_index(mr->key));
 294 }
 295 EXPORT_SYMBOL_GPL(mlx4_mr_free);
 296
 297 int mlx4_mr_enable(struct mlx4_dev *dev, struct mlx4_mr *mr)
 298 {
 299         struct mlx4_mr_table *mr_table = &mlx4_priv(dev)->mr_table;
 300         struct mlx4_cmd_mailbox *mailbox;
 301         struct mlx4_mpt_entry *mpt_entry;
 302         int err;
 303
 304         err = mlx4_table_get(dev, &mr_table->dmpt_table, key_to_hw_index(mr->key));
 305         if (err)
 306                 return err;
 307
 308         mailbox = mlx4_alloc_cmd_mailbox(dev);
 309         if (IS_ERR(mailbox)) {
 310                 err = PTR_ERR(mailbox);
 311                 goto err_table;
 312         }
 313         mpt_entry = mailbox->buf;
 314
 315         memset(mpt_entry, 0, sizeof *mpt_entry);
 316
 317         mpt_entry->flags = cpu_to_be32(MLX4_MPT_FLAG_SW_OWNS     |
 318                                        MLX4_MPT_FLAG_MIO         |
 319                                        MLX4_MPT_FLAG_REGION      |
 320                                        mr->access);
 321
 322         mpt_entry->key         = cpu_to_be32(key_to_hw_index(mr->key));
 323         mpt_entry->pd          = cpu_to_be32(mr->pd);
 324         mpt_entry->start       = cpu_to_be64(mr->iova);
 325         mpt_entry->length      = cpu_to_be64(mr->size);
 326         mpt_entry->entity_size = cpu_to_be32(mr->mtt.page_shift);
 327         if (mr->mtt.order < 0) {
 328                 mpt_entry->flags |= cpu_to_be32(MLX4_MPT_FLAG_PHYSICAL);
 329                 mpt_entry->mtt_seg = 0;
 330         } else
 331                 mpt_entry->mtt_seg = cpu_to_be64(mlx4_mtt_addr(dev, &mr->mtt));
 332
 333         err = mlx4_SW2HW_MPT(dev, mailbox,
 334                              key_to_hw_index(mr->key) & (dev->caps.num_mpts - 1));
 335         if (err) {
 336                 mlx4_warn(dev, "SW2HW_MPT failed (%d)\n", err);
 337                 goto err_cmd;
 338         }
 339
 340         mr->enabled = 1;
 341
 342         mlx4_free_cmd_mailbox(dev, mailbox);
 343
 344         return 0;
 345
 346 err_cmd:
 347         mlx4_free_cmd_mailbox(dev, mailbox);
 348
 349 err_table:
 350         mlx4_table_put(dev, &mr_table->dmpt_table, key_to_hw_index(mr->key));
 351         return err;
 352 }
 353 EXPORT_SYMBOL_GPL(mlx4_mr_enable);
 354
 355 static int mlx4_write_mtt_chunk(struct mlx4_dev *dev, struct mlx4_mtt *mtt,
 356                                 int start_index, int npages, u64 *page_list)
 357 {
 358         struct mlx4_priv *priv = mlx4_priv(dev);
 359         __be64 *mtts;
 360         dma_addr_t dma_handle;
 361         int i;
 362         int s = start_index * sizeof (u64);
 363
 364         /* All MTTs must fit in the same page */
 365         if (start_index / (PAGE_SIZE / sizeof (u64)) !=
 366             (start_index + npages - 1) / (PAGE_SIZE / sizeof (u64)))
 367                 return -EINVAL;
 368
 369         if (start_index & (MLX4_MTT_ENTRY_PER_SEG - 1))
 370                 return -EINVAL;
 371
 372         mtts = mlx4_table_find(&priv->mr_table.mtt_table, mtt->first_seg +
 373                                 s / dev->caps.mtt_entry_sz, &dma_handle);
 374         if (!mtts)
 375                 return -ENOMEM;
 376
 377         for (i = 0; i < npages; ++i)
 378                 mtts[i] = cpu_to_be64(page_list[i] | MLX4_MTT_FLAG_PRESENT);
 379
 380         dma_sync_single(&dev->pdev->dev, dma_handle, npages * sizeof (u64), DMA_TO_DEVICE);
 381
 382         return 0;
 383 }
 384
 385 int mlx4_write_mtt(struct mlx4_dev *dev, struct mlx4_mtt *mtt,
 386                    int start_index, int npages, u64 *page_list)
 387 {
 388         int chunk;
 389         int err;
 390
 391         if (mtt->order < 0)
 392                 return -EINVAL;
 393
 394         while (npages > 0) {
 395                 chunk = min_t(int, PAGE_SIZE / sizeof(u64), npages);
 396                 err = mlx4_write_mtt_chunk(dev, mtt, start_index, chunk, page_list);
 397                 if (err)
 398                         return err;
 399
 400                 npages      -= chunk;
 401                 start_index += chunk;
 402                 page_list   += chunk;
 403         }
 404
 405         return 0;
 406 }
 407 EXPORT_SYMBOL_GPL(mlx4_write_mtt);
 408
 409 int mlx4_buf_write_mtt(struct mlx4_dev *dev, struct mlx4_mtt *mtt,
 410                        struct mlx4_buf *buf)
 411 {
 412         u64 *page_list;
 413         int err;
 414         int i;
 415
 416         page_list = kmalloc(buf->npages * sizeof *page_list, GFP_KERNEL);
 417         if (!page_list)
 418                 return -ENOMEM;
 419
 420         for (i = 0; i < buf->npages; ++i)
 421                 if (buf->nbufs == 1)
 422                         page_list[i] = buf->direct.map + (i << buf->page_shift);
 423                 else
 424                         page_list[i] = buf->page_list[i].map;
 425
 426         err = mlx4_write_mtt(dev, mtt, 0, buf->npages, page_list);
 427
 428         kfree(page_list);
 429         return err;
 430 }
 431 EXPORT_SYMBOL_GPL(mlx4_buf_write_mtt);
 432
 433 int mlx4_init_mr_table(struct mlx4_dev *dev)
 434 {
 435         struct mlx4_mr_table *mr_table = &mlx4_priv(dev)->mr_table;
 436         int err;
 437
 438         err = mlx4_bitmap_init(&mr_table->mpt_bitmap, dev->caps.num_mpts,
 439                                ~0, dev->caps.reserved_mrws);
 440         if (err)
 441                 return err;
 442
 443         err = mlx4_buddy_init(&mr_table->mtt_buddy,
 444                               ilog2(dev->caps.num_mtt_segs));
 445         if (err)
 446                 goto err_buddy;
 447
 448         if (dev->caps.reserved_mtts) {
 449                 if (mlx4_alloc_mtt_range(dev, fls(dev->caps.reserved_mtts - 1)) == -1) {
 450                         mlx4_warn(dev, "MTT table of order %d is too small.\n",
 451                                   mr_table->mtt_buddy.max_order);
 452                         err = -ENOMEM;
 453                         goto err_reserve_mtts;
 454                 }
 455         }
 456
 457         return 0;
 458
 459 err_reserve_mtts:
 460         mlx4_buddy_cleanup(&mr_table->mtt_buddy);
 461
 462 err_buddy:
 463         mlx4_bitmap_cleanup(&mr_table->mpt_bitmap);
 464
 465         return err;
 466 }
 467
 468 void mlx4_cleanup_mr_table(struct mlx4_dev *dev)
 469 {
 470         struct mlx4_mr_table *mr_table = &mlx4_priv(dev)->mr_table;
 471
 472         mlx4_buddy_cleanup(&mr_table->mtt_buddy);
 473         mlx4_bitmap_cleanup(&mr_table->mpt_bitmap);
 474 }
 475
 476 static inline int mlx4_check_fmr(struct mlx4_fmr *fmr, u64 *page_list,
 477                                   int npages, u64 iova)
 478 {
 479         int i, page_mask;
 480
 481         if (npages > fmr->max_pages)
 482                 return -EINVAL;
 483
 484         page_mask = (1 << fmr->page_shift) - 1;
 485
 486         /* We are getting page lists, so va must be page aligned. */
 487         if (iova & page_mask)
 488                 return -EINVAL;
 489
 490         /* Trust the user not to pass misaligned data in page_list */
 491         if (0)
 492                 for (i = 0; i < npages; ++i) {
 493                         if (page_list[i] & ~page_mask)
 494                                 return -EINVAL;
 495                 }
 496
 497         if (fmr->maps >= fmr->max_maps)
 498                 return -EINVAL;
 499
 500         return 0;
 501 }
 502
 503 int mlx4_map_phys_fmr(struct mlx4_dev *dev, struct mlx4_fmr *fmr, u64 *page_list,
 504                       int npages, u64 iova, u32 *lkey, u32 *rkey)
 505 {
 506         u32 key;
 507         int i, err;
 508
 509         err = mlx4_check_fmr(fmr, page_list, npages, iova);
 510         if (err)
 511                 return err;
 512
 513         ++fmr->maps;
 514
 515         key = key_to_hw_index(fmr->mr.key);
 516         key += dev->caps.num_mpts;
 517         *lkey = *rkey = fmr->mr.key = hw_index_to_key(key);
 518
 519         *(u8 *) fmr->mpt = MLX4_MPT_STATUS_SW;
 520
 521         /* Make sure MPT status is visible before writing MTT entries */
 522         wmb();
 523
 524         for (i = 0; i < npages; ++i)
 525                 fmr->mtts[i] = cpu_to_be64(page_list[i] | MLX4_MTT_FLAG_PRESENT);
 526
 527         dma_sync_single(&dev->pdev->dev, fmr->dma_handle,
 528                         npages * sizeof(u64), DMA_TO_DEVICE);
 529
 530         fmr->mpt->key    = cpu_to_be32(key);
 531         fmr->mpt->lkey   = cpu_to_be32(key);
 532         fmr->mpt->length = cpu_to_be64(npages * (1ull << fmr->page_shift));
 533         fmr->mpt->start  = cpu_to_be64(iova);
 534
 535         /* Make MTT entries are visible before setting MPT status */
 536         wmb();
 537
 538         *(u8 *) fmr->mpt = MLX4_MPT_STATUS_HW;
 539
 540         /* Make sure MPT status is visible before consumer can use FMR */
 541         wmb();
 542
 543         return 0;
 544 }
 545 EXPORT_SYMBOL_GPL(mlx4_map_phys_fmr);
 546
 547 int mlx4_fmr_alloc(struct mlx4_dev *dev, u32 pd, u32 access, int max_pages,
 548                    int max_maps, u8 page_shift, struct mlx4_fmr *fmr)
 549 {
 550         struct mlx4_priv *priv = mlx4_priv(dev);
 551         u64 mtt_seg;
 552         int err = -ENOMEM;
 553
 554         if (page_shift < (ffs(dev->caps.page_size_cap) - 1) || page_shift >= 32)
 555                 return -EINVAL;
 556
 557         /* All MTTs must fit in the same page */
 558         if (max_pages * sizeof *fmr->mtts > PAGE_SIZE)
 559                 return -EINVAL;
 560
 561         fmr->page_shift = page_shift;
 562         fmr->max_pages  = max_pages;
 563         fmr->max_maps   = max_maps;
 564         fmr->maps = 0;
 565
 566         err = mlx4_mr_alloc(dev, pd, 0, 0, access, max_pages,
 567                             page_shift, &fmr->mr);
 568         if (err)
 569                 return err;
 570
 571         mtt_seg = fmr->mr.mtt.first_seg * dev->caps.mtt_entry_sz;
 572
 573         fmr->mtts = mlx4_table_find(&priv->mr_table.mtt_table,
 574                                     fmr->mr.mtt.first_seg,
 575                                     &fmr->dma_handle);
 576         if (!fmr->mtts) {
 577                 err = -ENOMEM;
 578                 goto err_free;
 579         }
 580
 581         return 0;
 582
 583 err_free:
 584         mlx4_mr_free(dev, &fmr->mr);
 585         return err;
 586 }
 587 EXPORT_SYMBOL_GPL(mlx4_fmr_alloc);
 588
 589 int mlx4_fmr_enable(struct mlx4_dev *dev, struct mlx4_fmr *fmr)
 590 {
 591         struct mlx4_priv *priv = mlx4_priv(dev);
 592         int err;
 593
 594         err = mlx4_mr_enable(dev, &fmr->mr);
 595         if (err)
 596                 return err;
 597
 598         fmr->mpt = mlx4_table_find(&priv->mr_table.dmpt_table,
 599                                     key_to_hw_index(fmr->mr.key), NULL);
 600         if (!fmr->mpt)
 601                 return -ENOMEM;
 602
 603         return 0;
 604 }
 605 EXPORT_SYMBOL_GPL(mlx4_fmr_enable);
 606
 607 void mlx4_fmr_unmap(struct mlx4_dev *dev, struct mlx4_fmr *fmr,
 608                     u32 *lkey, u32 *rkey)
 609 {
 610         if (!fmr->maps)
 611                 return;
 612
 613         fmr->maps = 0;
 614
 615         *(u8 *) fmr->mpt = MLX4_MPT_STATUS_SW;
 616 }
 617 EXPORT_SYMBOL_GPL(mlx4_fmr_unmap);
 618
 619 int mlx4_fmr_free(struct mlx4_dev *dev, struct mlx4_fmr *fmr)
 620 {
 621         if (fmr->maps)
 622                 return -EBUSY;
 623
 624         fmr->mr.enabled = 0;
 625         mlx4_mr_free(dev, &fmr->mr);
 626
 627         return 0;
 628 }
 629 EXPORT_SYMBOL_GPL(mlx4_fmr_free);
 630
 631 int mlx4_SYNC_TPT(struct mlx4_dev *dev)
 632 {
 633         return mlx4_cmd(dev, 0, 0, 0, MLX4_CMD_SYNC_TPT, 1000);
 634 }
 635 EXPORT_SYMBOL_GPL(mlx4_SYNC_TPT);