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 = kmalloc(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 = kmalloc(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 err;
 227                 int n;
 228
 229                 mlx4_mr_rereg_mem_cleanup(dev->dev, &mmr->mmr);
 230                 ib_umem_release(mmr->umem);
 231                 mmr->umem = ib_umem_get(mr->uobject->context, start, length,
 232                                         mr_access_flags |
 233                                         IB_ACCESS_LOCAL_WRITE,
 234                                         0);
 235                 if (IS_ERR(mmr->umem)) {
 236                         err = PTR_ERR(mmr->umem);
 237                         /* Prevent mlx4_ib_dereg_mr from free'ing invalid pointer */
 238                         mmr->umem = NULL;
 239                         goto release_mpt_entry;
 240                 }
 241                 n = ib_umem_page_count(mmr->umem);
 242                 shift = ilog2(mmr->umem->page_size);
 243
 244                 err = mlx4_mr_rereg_mem_write(dev->dev, &mmr->mmr,
 245                                               virt_addr, length, n, shift,
 246                                               *pmpt_entry);
 247                 if (err) {
 248                         ib_umem_release(mmr->umem);
 249                         goto release_mpt_entry;
 250                 }
 251                 mmr->mmr.iova       = virt_addr;
 252                 mmr->mmr.size       = length;
 253
 254                 err = mlx4_ib_umem_write_mtt(dev, &mmr->mmr.mtt, mmr->umem);
 255                 if (err) {
 256                         mlx4_mr_rereg_mem_cleanup(dev->dev, &mmr->mmr);
 257                         ib_umem_release(mmr->umem);
 258                         goto release_mpt_entry;
 259                 }
 260         }
 261
 262         /* If we couldn't transfer the MR to the HCA, just remember to
 263          * return a failure. But dereg_mr will free the resources.
 264          */
 265         err = mlx4_mr_hw_write_mpt(dev->dev, &mmr->mmr, pmpt_entry);
 266         if (!err && flags & IB_MR_REREG_ACCESS)
 267                 mmr->mmr.access = mr_access_flags;
 268
 269 release_mpt_entry:
 270         mlx4_mr_hw_put_mpt(dev->dev, pmpt_entry);
 271
 272         return err;
 273 }
 274
 275 int mlx4_ib_dereg_mr(struct ib_mr *ibmr)
 276 {
 277         struct mlx4_ib_mr *mr = to_mmr(ibmr);
 278         int ret;
 279
 280         ret = mlx4_mr_free(to_mdev(ibmr->device)->dev, &mr->mmr);
 281         if (ret)
 282                 return ret;
 283         if (mr->umem)
 284                 ib_umem_release(mr->umem);
 285         kfree(mr);
 286
 287         return 0;
 288 }
 289
 290 struct ib_mw *mlx4_ib_alloc_mw(struct ib_pd *pd, enum ib_mw_type type)
 291 {
 292         struct mlx4_ib_dev *dev = to_mdev(pd->device);
 293         struct mlx4_ib_mw *mw;
 294         int err;
 295
 296         mw = kmalloc(sizeof(*mw), GFP_KERNEL);
 297         if (!mw)
 298                 return ERR_PTR(-ENOMEM);
 299
 300         err = mlx4_mw_alloc(dev->dev, to_mpd(pd)->pdn,
 301                             to_mlx4_type(type), &mw->mmw);
 302         if (err)
 303                 goto err_free;
 304
 305         err = mlx4_mw_enable(dev->dev, &mw->mmw);
 306         if (err)
 307                 goto err_mw;
 308
 309         mw->ibmw.rkey = mw->mmw.key;
 310
 311         return &mw->ibmw;
 312
 313 err_mw:
 314         mlx4_mw_free(dev->dev, &mw->mmw);
 315
 316 err_free:
 317         kfree(mw);
 318
 319         return ERR_PTR(err);
 320 }
 321
 322 int mlx4_ib_bind_mw(struct ib_qp *qp, struct ib_mw *mw,
 323                     struct ib_mw_bind *mw_bind)
 324 {
 325         struct ib_send_wr  wr;
 326         struct ib_send_wr *bad_wr;
 327         int ret;
 328
 329         memset(&wr, 0, sizeof(wr));
 330         wr.opcode               = IB_WR_BIND_MW;
 331         wr.wr_id                = mw_bind->wr_id;
 332         wr.send_flags           = mw_bind->send_flags;
 333         wr.wr.bind_mw.mw        = mw;
 334         wr.wr.bind_mw.bind_info = mw_bind->bind_info;
 335         wr.wr.bind_mw.rkey      = ib_inc_rkey(mw->rkey);
 336
 337         ret = mlx4_ib_post_send(qp, &wr, &bad_wr);
 338         if (!ret)
 339                 mw->rkey = wr.wr.bind_mw.rkey;
 340
 341         return ret;
 342 }
 343
 344 int mlx4_ib_dealloc_mw(struct ib_mw *ibmw)
 345 {
 346         struct mlx4_ib_mw *mw = to_mmw(ibmw);
 347
 348         mlx4_mw_free(to_mdev(ibmw->device)->dev, &mw->mmw);
 349         kfree(mw);
 350
 351         return 0;
 352 }
 353
 354 struct ib_mr *mlx4_ib_alloc_fast_reg_mr(struct ib_pd *pd,
 355                                         int max_page_list_len)
 356 {
 357         struct mlx4_ib_dev *dev = to_mdev(pd->device);
 358         struct mlx4_ib_mr *mr;
 359         int err;
 360
 361         mr = kmalloc(sizeof *mr, GFP_KERNEL);
 362         if (!mr)
 363                 return ERR_PTR(-ENOMEM);
 364
 365         err = mlx4_mr_alloc(dev->dev, to_mpd(pd)->pdn, 0, 0, 0,
 366                             max_page_list_len, 0, &mr->mmr);
 367         if (err)
 368                 goto err_free;
 369
 370         err = mlx4_mr_enable(dev->dev, &mr->mmr);
 371         if (err)
 372                 goto err_mr;
 373
 374         mr->ibmr.rkey = mr->ibmr.lkey = mr->mmr.key;
 375         mr->umem = NULL;
 376
 377         return &mr->ibmr;
 378
 379 err_mr:
 380         (void) mlx4_mr_free(dev->dev, &mr->mmr);
 381
 382 err_free:
 383         kfree(mr);
 384         return ERR_PTR(err);
 385 }
 386
 387 struct ib_fast_reg_page_list *mlx4_ib_alloc_fast_reg_page_list(struct ib_device *ibdev,
 388                                                                int page_list_len)
 389 {
 390         struct mlx4_ib_dev *dev = to_mdev(ibdev);
 391         struct mlx4_ib_fast_reg_page_list *mfrpl;
 392         int size = page_list_len * sizeof (u64);
 393
 394         if (page_list_len > MLX4_MAX_FAST_REG_PAGES)
 395                 return ERR_PTR(-EINVAL);
 396
 397         mfrpl = kmalloc(sizeof *mfrpl, GFP_KERNEL);
 398         if (!mfrpl)
 399                 return ERR_PTR(-ENOMEM);
 400
 401         mfrpl->ibfrpl.page_list = kmalloc(size, GFP_KERNEL);
 402         if (!mfrpl->ibfrpl.page_list)
 403                 goto err_free;
 404
 405         mfrpl->mapped_page_list = dma_alloc_coherent(&dev->dev->pdev->dev,
 406                                                      size, &mfrpl->map,
 407                                                      GFP_KERNEL);
 408         if (!mfrpl->mapped_page_list)
 409                 goto err_free;
 410
 411         WARN_ON(mfrpl->map & 0x3f);
 412
 413         return &mfrpl->ibfrpl;
 414
 415 err_free:
 416         kfree(mfrpl->ibfrpl.page_list);
 417         kfree(mfrpl);
 418         return ERR_PTR(-ENOMEM);
 419 }
 420
 421 void mlx4_ib_free_fast_reg_page_list(struct ib_fast_reg_page_list *page_list)
 422 {
 423         struct mlx4_ib_dev *dev = to_mdev(page_list->device);
 424         struct mlx4_ib_fast_reg_page_list *mfrpl = to_mfrpl(page_list);
 425         int size = page_list->max_page_list_len * sizeof (u64);
 426
 427         dma_free_coherent(&dev->dev->pdev->dev, size, mfrpl->mapped_page_list,
 428                           mfrpl->map);
 429         kfree(mfrpl->ibfrpl.page_list);
 430         kfree(mfrpl);
 431 }
 432
 433 struct ib_fmr *mlx4_ib_fmr_alloc(struct ib_pd *pd, int acc,
 434                                  struct ib_fmr_attr *fmr_attr)
 435 {
 436         struct mlx4_ib_dev *dev = to_mdev(pd->device);
 437         struct mlx4_ib_fmr *fmr;
 438         int err = -ENOMEM;
 439
 440         fmr = kmalloc(sizeof *fmr, GFP_KERNEL);
 441         if (!fmr)
 442                 return ERR_PTR(-ENOMEM);
 443
 444         err = mlx4_fmr_alloc(dev->dev, to_mpd(pd)->pdn, convert_access(acc),
 445                              fmr_attr->max_pages, fmr_attr->max_maps,
 446                              fmr_attr->page_shift, &fmr->mfmr);
 447         if (err)
 448                 goto err_free;
 449
 450         err = mlx4_fmr_enable(to_mdev(pd->device)->dev, &fmr->mfmr);
 451         if (err)
 452                 goto err_mr;
 453
 454         fmr->ibfmr.rkey = fmr->ibfmr.lkey = fmr->mfmr.mr.key;
 455
 456         return &fmr->ibfmr;
 457
 458 err_mr:
 459         (void) mlx4_mr_free(to_mdev(pd->device)->dev, &fmr->mfmr.mr);
 460
 461 err_free:
 462         kfree(fmr);
 463
 464         return ERR_PTR(err);
 465 }
 466
 467 int mlx4_ib_map_phys_fmr(struct ib_fmr *ibfmr, u64 *page_list,
 468                       int npages, u64 iova)
 469 {
 470         struct mlx4_ib_fmr *ifmr = to_mfmr(ibfmr);
 471         struct mlx4_ib_dev *dev = to_mdev(ifmr->ibfmr.device);
 472
 473         return mlx4_map_phys_fmr(dev->dev, &ifmr->mfmr, page_list, npages, iova,
 474                                  &ifmr->ibfmr.lkey, &ifmr->ibfmr.rkey);
 475 }
 476
 477 int mlx4_ib_unmap_fmr(struct list_head *fmr_list)
 478 {
 479         struct ib_fmr *ibfmr;
 480         int err;
 481         struct mlx4_dev *mdev = NULL;
 482
 483         list_for_each_entry(ibfmr, fmr_list, list) {
 484                 if (mdev && to_mdev(ibfmr->device)->dev != mdev)
 485                         return -EINVAL;
 486                 mdev = to_mdev(ibfmr->device)->dev;
 487         }
 488
 489         if (!mdev)
 490                 return 0;
 491
 492         list_for_each_entry(ibfmr, fmr_list, list) {
 493                 struct mlx4_ib_fmr *ifmr = to_mfmr(ibfmr);
 494
 495                 mlx4_fmr_unmap(mdev, &ifmr->mfmr, &ifmr->ibfmr.lkey, &ifmr->ibfmr.rkey);
 496         }
 497
 498         /*
 499          * Make sure all MPT status updates are visible before issuing
 500          * SYNC_TPT firmware command.
 501          */
 502         wmb();
 503
 504         err = mlx4_SYNC_TPT(mdev);
 505         if (err)
 506                 pr_warn("SYNC_TPT error %d when "
 507                        "unmapping FMRs\n", err);
 508
 509         return 0;
 510 }
 511
 512 int mlx4_ib_fmr_dealloc(struct ib_fmr *ibfmr)
 513 {
 514         struct mlx4_ib_fmr *ifmr = to_mfmr(ibfmr);
 515         struct mlx4_ib_dev *dev = to_mdev(ibfmr->device);
 516         int err;
 517
 518         err = mlx4_fmr_free(dev->dev, &ifmr->mfmr);
 519
 520         if (!err)
 521                 kfree(ifmr);
 522
 523         return err;
 524 }