drivers/infiniband/hw/mlx4/mr.c

   1 /*
   2  * Copyright (c) 2007 Cisco Systems, Inc. All rights reserved.
   3  * Copyright (c) 2007, 2008 Mellanox Technologies. 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 <linux/slab.h>
  35
  36 #include "mlx4_ib.h"
  37
  38 static u32 convert_access(int acc)
  39 {
  40         return (acc & IB_ACCESS_REMOTE_ATOMIC ? MLX4_PERM_ATOMIC       : 0) |
  41                (acc & IB_ACCESS_REMOTE_WRITE  ? MLX4_PERM_REMOTE_WRITE : 0) |
  42                (acc & IB_ACCESS_REMOTE_READ   ? MLX4_PERM_REMOTE_READ  : 0) |
  43                (acc & IB_ACCESS_LOCAL_WRITE   ? MLX4_PERM_LOCAL_WRITE  : 0) |
  44                (acc & IB_ACCESS_MW_BIND       ? MLX4_PERM_BIND_MW      : 0) |
  45                MLX4_PERM_LOCAL_READ;
  46 }
  47
  48 static enum mlx4_mw_type to_mlx4_type(enum ib_mw_type type)
  49 {
  50         switch (type) {
  51         case IB_MW_TYPE_1:      return MLX4_MW_TYPE_1;
  52         case IB_MW_TYPE_2:      return MLX4_MW_TYPE_2;
  53         default:                return -1;
  54         }
  55 }
  56
  57 struct ib_mr *mlx4_ib_get_dma_mr(struct ib_pd *pd, int acc)
  58 {
  59         struct mlx4_ib_mr *mr;
  60         int err;
  61
  62         mr = kzalloc(sizeof(*mr), GFP_KERNEL);
  63         if (!mr)
  64                 return ERR_PTR(-ENOMEM);
  65
  66         err = mlx4_mr_alloc(to_mdev(pd->device)->dev, to_mpd(pd)->pdn, 0,
  67                             ~0ull, convert_access(acc), 0, 0, &mr->mmr);
  68         if (err)
  69                 goto err_free;
  70
  71         err = mlx4_mr_enable(to_mdev(pd->device)->dev, &mr->mmr);
  72         if (err)
  73                 goto err_mr;
  74
  75         mr->ibmr.rkey = mr->ibmr.lkey = mr->mmr.key;
  76         mr->umem = NULL;
  77
  78         return &mr->ibmr;
  79
  80 err_mr:
  81         (void) mlx4_mr_free(to_mdev(pd->device)->dev, &mr->mmr);
  82
  83 err_free:
  84         kfree(mr);
  85
  86         return ERR_PTR(err);
  87 }
  88
  89 int mlx4_ib_umem_write_mtt(struct mlx4_ib_dev *dev, struct mlx4_mtt *mtt,
  90                            struct ib_umem *umem)
  91 {
  92         u64 *pages;
  93         int i, k, entry;
  94         int n;
  95         int len;
  96         int err = 0;
  97         struct scatterlist *sg;
  98
  99         pages = (u64 *) __get_free_page(GFP_KERNEL);
 100         if (!pages)
 101                 return -ENOMEM;
 102
 103         i = n = 0;
 104
 105         for_each_sg(umem->sg_head.sgl, sg, umem->nmap, entry) {
 106                 len = sg_dma_len(sg) >> mtt->page_shift;
 107                 for (k = 0; k < len; ++k) {
 108                         pages[i++] = sg_dma_address(sg) +
 109                                 umem->page_size * k;
 110                         /*
 111                          * Be friendly to mlx4_write_mtt() and
 112                          * pass it chunks of appropriate size.
 113                          */
 114                         if (i == PAGE_SIZE / sizeof (u64)) {
 115                                 err = mlx4_write_mtt(dev->dev, mtt, n,
 116                                                      i, pages);
 117                                 if (err)
 118                                         goto out;
 119                                 n += i;
 120                                 i = 0;
 121                         }
 122                 }
 123         }
 124
 125         if (i)
 126                 err = mlx4_write_mtt(dev->dev, mtt, n, i, pages);
 127
 128 out:
 129         free_page((unsigned long) pages);
 130         return err;
 131 }
 132
 133 struct ib_mr *mlx4_ib_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
 134                                   u64 virt_addr, int access_flags,
 135                                   struct ib_udata *udata)
 136 {
 137         struct mlx4_ib_dev *dev = to_mdev(pd->device);
 138         struct mlx4_ib_mr *mr;
 139         int shift;
 140         int err;
 141         int n;
 142
 143         mr = kzalloc(sizeof(*mr), GFP_KERNEL);
 144         if (!mr)
 145                 return ERR_PTR(-ENOMEM);
 146
 147         /* Force registering the memory as writable. */
 148         /* Used for memory re-registeration. HCA protects the access */
 149         mr->umem = ib_umem_get(pd->uobject->context, start, length,
 150                                access_flags | IB_ACCESS_LOCAL_WRITE, 0);
 151         if (IS_ERR(mr->umem)) {
 152                 err = PTR_ERR(mr->umem);
 153                 goto err_free;
 154         }
 155
 156         n = ib_umem_page_count(mr->umem);
 157         shift = ilog2(mr->umem->page_size);
 158
 159         err = mlx4_mr_alloc(dev->dev, to_mpd(pd)->pdn, virt_addr, length,
 160                             convert_access(access_flags), n, shift, &mr->mmr);
 161         if (err)
 162                 goto err_umem;
 163
 164         err = mlx4_ib_umem_write_mtt(dev, &mr->mmr.mtt, mr->umem);
 165         if (err)
 166                 goto err_mr;
 167
 168         err = mlx4_mr_enable(dev->dev, &mr->mmr);
 169         if (err)
 170                 goto err_mr;
 171
 172         mr->ibmr.rkey = mr->ibmr.lkey = mr->mmr.key;
 173
 174         return &mr->ibmr;
 175
 176 err_mr:
 177         (void) mlx4_mr_free(to_mdev(pd->device)->dev, &mr->mmr);
 178
 179 err_umem:
 180         ib_umem_release(mr->umem);
 181
 182 err_free:
 183         kfree(mr);
 184
 185         return ERR_PTR(err);
 186 }
 187
 188 int mlx4_ib_rereg_user_mr(struct ib_mr *mr, int flags,
 189                           u64 start, u64 length, u64 virt_addr,
 190                           int mr_access_flags, struct ib_pd *pd,
 191                           struct ib_udata *udata)
 192 {
 193         struct mlx4_ib_dev *dev = to_mdev(mr->device);
 194         struct mlx4_ib_mr *mmr = to_mmr(mr);
 195         struct mlx4_mpt_entry *mpt_entry;
 196         struct mlx4_mpt_entry **pmpt_entry = &mpt_entry;
 197         int err;
 198
 199         /* Since we synchronize this call and mlx4_ib_dereg_mr via uverbs,
 200          * we assume that the calls can't run concurrently. Otherwise, a
 201          * race exists.
 202          */
 203         err =  mlx4_mr_hw_get_mpt(dev->dev, &mmr->mmr, &pmpt_entry);
 204
 205         if (err)
 206                 return err;
 207
 208         if (flags & IB_MR_REREG_PD) {
 209                 err = mlx4_mr_hw_change_pd(dev->dev, *pmpt_entry,
 210                                            to_mpd(pd)->pdn);
 211
 212                 if (err)
 213                         goto release_mpt_entry;
 214         }
 215
 216         if (flags & IB_MR_REREG_ACCESS) {
 217                 err = mlx4_mr_hw_change_access(dev->dev, *pmpt_entry,
 218                                                convert_access(mr_access_flags));
 219
 220                 if (err)
 221                         goto release_mpt_entry;
 222         }
 223
 224         if (flags & IB_MR_REREG_TRANS) {
 225                 int shift;
 226                 int n;
 227
 228                 mlx4_mr_rereg_mem_cleanup(dev->dev, &mmr->mmr);
 229                 ib_umem_release(mmr->umem);
 230                 mmr->umem = ib_umem_get(mr->uobject->context, start, length,
 231                                         mr_access_flags |
 232                                         IB_ACCESS_LOCAL_WRITE,
 233                                         0);
 234                 if (IS_ERR(mmr->umem)) {
 235                         err = PTR_ERR(mmr->umem);
 236                         /* Prevent mlx4_ib_dereg_mr from free'ing invalid pointer */
 237                         mmr->umem = NULL;
 238                         goto release_mpt_entry;
 239                 }
 240                 n = ib_umem_page_count(mmr->umem);
 241                 shift = ilog2(mmr->umem->page_size);
 242
 243                 err = mlx4_mr_rereg_mem_write(dev->dev, &mmr->mmr,
 244                                               virt_addr, length, n, shift,
 245                                               *pmpt_entry);
 246                 if (err) {
 247                         ib_umem_release(mmr->umem);
 248                         goto release_mpt_entry;
 249                 }
 250                 mmr->mmr.iova       = virt_addr;
 251                 mmr->mmr.size       = length;
 252
 253                 err = mlx4_ib_umem_write_mtt(dev, &mmr->mmr.mtt, mmr->umem);
 254                 if (err) {
 255                         mlx4_mr_rereg_mem_cleanup(dev->dev, &mmr->mmr);
 256                         ib_umem_release(mmr->umem);
 257                         goto release_mpt_entry;
 258                 }
 259         }
 260
 261         /* If we couldn't transfer the MR to the HCA, just remember to
 262          * return a failure. But dereg_mr will free the resources.
 263          */
 264         err = mlx4_mr_hw_write_mpt(dev->dev, &mmr->mmr, pmpt_entry);
 265         if (!err && flags & IB_MR_REREG_ACCESS)
 266                 mmr->mmr.access = mr_access_flags;
 267
 268 release_mpt_entry:
 269         mlx4_mr_hw_put_mpt(dev->dev, pmpt_entry);
 270
 271         return err;
 272 }
 273
 274 static int
 275 mlx4_alloc_priv_pages(struct ib_device *device,
 276                       struct mlx4_ib_mr *mr,
 277                       int max_pages)
 278 {
 279         int size = max_pages * sizeof(u64);
 280         int add_size;
 281         int ret;
 282
 283         add_size = max_t(int, MLX4_MR_PAGES_ALIGN - ARCH_KMALLOC_MINALIGN, 0);
 284
 285         mr->pages_alloc = kzalloc(size + add_size, GFP_KERNEL);
 286         if (!mr->pages_alloc)
 287                 return -ENOMEM;
 288
 289         mr->pages = PTR_ALIGN(mr->pages_alloc, MLX4_MR_PAGES_ALIGN);
 290
 291         mr->page_map = dma_map_single(device->dma_device, mr->pages,
 292                                       size, DMA_TO_DEVICE);
 293
 294         if (dma_mapping_error(device->dma_device, mr->page_map)) {
 295                 ret = -ENOMEM;
 296                 goto err;
 297         }
 298
 299         return 0;
 300 err:
 301         kfree(mr->pages_alloc);
 302
 303         return ret;
 304 }
 305
 306 static void
 307 mlx4_free_priv_pages(struct mlx4_ib_mr *mr)
 308 {
 309         if (mr->pages) {
 310                 struct ib_device *device = mr->ibmr.device;
 311                 int size = mr->max_pages * sizeof(u64);
 312
 313                 dma_unmap_single(device->dma_device, mr->page_map,
 314                                  size, DMA_TO_DEVICE);
 315                 kfree(mr->pages_alloc);
 316                 mr->pages = NULL;
 317         }
 318 }
 319
 320 int mlx4_ib_dereg_mr(struct ib_mr *ibmr)
 321 {
 322         struct mlx4_ib_mr *mr = to_mmr(ibmr);
 323         int ret;
 324
 325         mlx4_free_priv_pages(mr);
 326
 327         ret = mlx4_mr_free(to_mdev(ibmr->device)->dev, &mr->mmr);
 328         if (ret)
 329                 return ret;
 330         if (mr->umem)
 331                 ib_umem_release(mr->umem);
 332         kfree(mr);
 333
 334         return 0;
 335 }
 336
 337 struct ib_mw *mlx4_ib_alloc_mw(struct ib_pd *pd, enum ib_mw_type type)
 338 {
 339         struct mlx4_ib_dev *dev = to_mdev(pd->device);
 340         struct mlx4_ib_mw *mw;
 341         int err;
 342
 343         mw = kmalloc(sizeof(*mw), GFP_KERNEL);
 344         if (!mw)
 345                 return ERR_PTR(-ENOMEM);
 346
 347         err = mlx4_mw_alloc(dev->dev, to_mpd(pd)->pdn,
 348                             to_mlx4_type(type), &mw->mmw);
 349         if (err)
 350                 goto err_free;
 351
 352         err = mlx4_mw_enable(dev->dev, &mw->mmw);
 353         if (err)
 354                 goto err_mw;
 355
 356         mw->ibmw.rkey = mw->mmw.key;
 357
 358         return &mw->ibmw;
 359
 360 err_mw:
 361         mlx4_mw_free(dev->dev, &mw->mmw);
 362
 363 err_free:
 364         kfree(mw);
 365
 366         return ERR_PTR(err);
 367 }
 368
 369 int mlx4_ib_bind_mw(struct ib_qp *qp, struct ib_mw *mw,
 370                     struct ib_mw_bind *mw_bind)
 371 {
 372         struct ib_bind_mw_wr  wr;
 373         struct ib_send_wr *bad_wr;
 374         int ret;
 375
 376         memset(&wr, 0, sizeof(wr));
 377         wr.wr.opcode            = IB_WR_BIND_MW;
 378         wr.wr.wr_id             = mw_bind->wr_id;
 379         wr.wr.send_flags        = mw_bind->send_flags;
 380         wr.mw                   = mw;
 381         wr.bind_info            = mw_bind->bind_info;
 382         wr.rkey                 = ib_inc_rkey(mw->rkey);
 383
 384         ret = mlx4_ib_post_send(qp, &wr.wr, &bad_wr);
 385         if (!ret)
 386                 mw->rkey = wr.rkey;
 387
 388         return ret;
 389 }
 390
 391 int mlx4_ib_dealloc_mw(struct ib_mw *ibmw)
 392 {
 393         struct mlx4_ib_mw *mw = to_mmw(ibmw);
 394
 395         mlx4_mw_free(to_mdev(ibmw->device)->dev, &mw->mmw);
 396         kfree(mw);
 397
 398         return 0;
 399 }
 400
 401 struct ib_mr *mlx4_ib_alloc_mr(struct ib_pd *pd,
 402                                enum ib_mr_type mr_type,
 403                                u32 max_num_sg)
 404 {
 405         struct mlx4_ib_dev *dev = to_mdev(pd->device);
 406         struct mlx4_ib_mr *mr;
 407         int err;
 408
 409         if (mr_type != IB_MR_TYPE_MEM_REG ||
 410             max_num_sg > MLX4_MAX_FAST_REG_PAGES)
 411                 return ERR_PTR(-EINVAL);
 412
 413         mr = kzalloc(sizeof(*mr), GFP_KERNEL);
 414         if (!mr)
 415                 return ERR_PTR(-ENOMEM);
 416
 417         err = mlx4_mr_alloc(dev->dev, to_mpd(pd)->pdn, 0, 0, 0,
 418                             max_num_sg, 0, &mr->mmr);
 419         if (err)
 420                 goto err_free;
 421
 422         err = mlx4_alloc_priv_pages(pd->device, mr, max_num_sg);
 423         if (err)
 424                 goto err_free_mr;
 425
 426         mr->max_pages = max_num_sg;
 427
 428         err = mlx4_mr_enable(dev->dev, &mr->mmr);
 429         if (err)
 430                 goto err_free_pl;
 431
 432         mr->ibmr.rkey = mr->ibmr.lkey = mr->mmr.key;
 433         mr->umem = NULL;
 434
 435         return &mr->ibmr;
 436
 437 err_free_pl:
 438         mlx4_free_priv_pages(mr);
 439 err_free_mr:
 440         (void) mlx4_mr_free(dev->dev, &mr->mmr);
 441 err_free:
 442         kfree(mr);
 443         return ERR_PTR(err);
 444 }
 445
 446 struct ib_fmr *mlx4_ib_fmr_alloc(struct ib_pd *pd, int acc,
 447                                  struct ib_fmr_attr *fmr_attr)
 448 {
 449         struct mlx4_ib_dev *dev = to_mdev(pd->device);
 450         struct mlx4_ib_fmr *fmr;
 451         int err = -ENOMEM;
 452
 453         fmr = kmalloc(sizeof *fmr, GFP_KERNEL);
 454         if (!fmr)
 455                 return ERR_PTR(-ENOMEM);
 456
 457         err = mlx4_fmr_alloc(dev->dev, to_mpd(pd)->pdn, convert_access(acc),
 458                              fmr_attr->max_pages, fmr_attr->max_maps,
 459                              fmr_attr->page_shift, &fmr->mfmr);
 460         if (err)
 461                 goto err_free;
 462
 463         err = mlx4_fmr_enable(to_mdev(pd->device)->dev, &fmr->mfmr);
 464         if (err)
 465                 goto err_mr;
 466
 467         fmr->ibfmr.rkey = fmr->ibfmr.lkey = fmr->mfmr.mr.key;
 468
 469         return &fmr->ibfmr;
 470
 471 err_mr:
 472         (void) mlx4_mr_free(to_mdev(pd->device)->dev, &fmr->mfmr.mr);
 473
 474 err_free:
 475         kfree(fmr);
 476
 477         return ERR_PTR(err);
 478 }
 479
 480 int mlx4_ib_map_phys_fmr(struct ib_fmr *ibfmr, u64 *page_list,
 481                       int npages, u64 iova)
 482 {
 483         struct mlx4_ib_fmr *ifmr = to_mfmr(ibfmr);
 484         struct mlx4_ib_dev *dev = to_mdev(ifmr->ibfmr.device);
 485
 486         return mlx4_map_phys_fmr(dev->dev, &ifmr->mfmr, page_list, npages, iova,
 487                                  &ifmr->ibfmr.lkey, &ifmr->ibfmr.rkey);
 488 }
 489
 490 int mlx4_ib_unmap_fmr(struct list_head *fmr_list)
 491 {
 492         struct ib_fmr *ibfmr;
 493         int err;
 494         struct mlx4_dev *mdev = NULL;
 495
 496         list_for_each_entry(ibfmr, fmr_list, list) {
 497                 if (mdev && to_mdev(ibfmr->device)->dev != mdev)
 498                         return -EINVAL;
 499                 mdev = to_mdev(ibfmr->device)->dev;
 500         }
 501
 502         if (!mdev)
 503                 return 0;
 504
 505         list_for_each_entry(ibfmr, fmr_list, list) {
 506                 struct mlx4_ib_fmr *ifmr = to_mfmr(ibfmr);
 507
 508                 mlx4_fmr_unmap(mdev, &ifmr->mfmr, &ifmr->ibfmr.lkey, &ifmr->ibfmr.rkey);
 509         }
 510
 511         /*
 512          * Make sure all MPT status updates are visible before issuing
 513          * SYNC_TPT firmware command.
 514          */
 515         wmb();
 516
 517         err = mlx4_SYNC_TPT(mdev);
 518         if (err)
 519                 pr_warn("SYNC_TPT error %d when "
 520                        "unmapping FMRs\n", err);
 521
 522         return 0;
 523 }
 524
 525 int mlx4_ib_fmr_dealloc(struct ib_fmr *ibfmr)
 526 {
 527         struct mlx4_ib_fmr *ifmr = to_mfmr(ibfmr);
 528         struct mlx4_ib_dev *dev = to_mdev(ibfmr->device);
 529         int err;
 530
 531         err = mlx4_fmr_free(dev->dev, &ifmr->mfmr);
 532
 533         if (!err)
 534                 kfree(ifmr);
 535
 536         return err;
 537 }
 538
 539 static int mlx4_set_page(struct ib_mr *ibmr, u64 addr)
 540 {
 541         struct mlx4_ib_mr *mr = to_mmr(ibmr);
 542
 543         if (unlikely(mr->npages == mr->max_pages))
 544                 return -ENOMEM;
 545
 546         mr->pages[mr->npages++] = cpu_to_be64(addr | MLX4_MTT_FLAG_PRESENT);
 547
 548         return 0;
 549 }
 550
 551 int mlx4_ib_map_mr_sg(struct ib_mr *ibmr,
 552                       struct scatterlist *sg,
 553                       int sg_nents)
 554 {
 555         struct mlx4_ib_mr *mr = to_mmr(ibmr);
 556         int rc;
 557
 558         mr->npages = 0;
 559
 560         ib_dma_sync_single_for_cpu(ibmr->device, mr->page_map,
 561                                    sizeof(u64) * mr->max_pages,
 562                                    DMA_TO_DEVICE);
 563
 564         rc = ib_sg_to_pages(ibmr, sg, sg_nents, mlx4_set_page);
 565
 566         ib_dma_sync_single_for_device(ibmr->device, mr->page_map,
 567                                       sizeof(u64) * mr->max_pages,
 568                                       DMA_TO_DEVICE);
 569
 570         return rc;
 571 }