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 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 int mlx4_ib_dereg_mr(struct ib_mr *ibmr)
 275 {
 276         struct mlx4_ib_mr *mr = to_mmr(ibmr);
 277         int ret;
 278
 279         ret = mlx4_mr_free(to_mdev(ibmr->device)->dev, &mr->mmr);
 280         if (ret)
 281                 return ret;
 282         if (mr->umem)
 283                 ib_umem_release(mr->umem);
 284         kfree(mr);
 285
 286         return 0;
 287 }
 288
 289 struct ib_mw *mlx4_ib_alloc_mw(struct ib_pd *pd, enum ib_mw_type type)
 290 {
 291         struct mlx4_ib_dev *dev = to_mdev(pd->device);
 292         struct mlx4_ib_mw *mw;
 293         int err;
 294
 295         mw = kmalloc(sizeof(*mw), GFP_KERNEL);
 296         if (!mw)
 297                 return ERR_PTR(-ENOMEM);
 298
 299         err = mlx4_mw_alloc(dev->dev, to_mpd(pd)->pdn,
 300                             to_mlx4_type(type), &mw->mmw);
 301         if (err)
 302                 goto err_free;
 303
 304         err = mlx4_mw_enable(dev->dev, &mw->mmw);
 305         if (err)
 306                 goto err_mw;
 307
 308         mw->ibmw.rkey = mw->mmw.key;
 309
 310         return &mw->ibmw;
 311
 312 err_mw:
 313         mlx4_mw_free(dev->dev, &mw->mmw);
 314
 315 err_free:
 316         kfree(mw);
 317
 318         return ERR_PTR(err);
 319 }
 320
 321 int mlx4_ib_bind_mw(struct ib_qp *qp, struct ib_mw *mw,
 322                     struct ib_mw_bind *mw_bind)
 323 {
 324         struct ib_send_wr  wr;
 325         struct ib_send_wr *bad_wr;
 326         int ret;
 327
 328         memset(&wr, 0, sizeof(wr));
 329         wr.opcode               = IB_WR_BIND_MW;
 330         wr.wr_id                = mw_bind->wr_id;
 331         wr.send_flags           = mw_bind->send_flags;
 332         wr.wr.bind_mw.mw        = mw;
 333         wr.wr.bind_mw.bind_info = mw_bind->bind_info;
 334         wr.wr.bind_mw.rkey      = ib_inc_rkey(mw->rkey);
 335
 336         ret = mlx4_ib_post_send(qp, &wr, &bad_wr);
 337         if (!ret)
 338                 mw->rkey = wr.wr.bind_mw.rkey;
 339
 340         return ret;
 341 }
 342
 343 int mlx4_ib_dealloc_mw(struct ib_mw *ibmw)
 344 {
 345         struct mlx4_ib_mw *mw = to_mmw(ibmw);
 346
 347         mlx4_mw_free(to_mdev(ibmw->device)->dev, &mw->mmw);
 348         kfree(mw);
 349
 350         return 0;
 351 }
 352
 353 struct ib_mr *mlx4_ib_alloc_fast_reg_mr(struct ib_pd *pd,
 354                                         int max_page_list_len)
 355 {
 356         struct mlx4_ib_dev *dev = to_mdev(pd->device);
 357         struct mlx4_ib_mr *mr;
 358         int err;
 359
 360         mr = kmalloc(sizeof *mr, GFP_KERNEL);
 361         if (!mr)
 362                 return ERR_PTR(-ENOMEM);
 363
 364         err = mlx4_mr_alloc(dev->dev, to_mpd(pd)->pdn, 0, 0, 0,
 365                             max_page_list_len, 0, &mr->mmr);
 366         if (err)
 367                 goto err_free;
 368
 369         err = mlx4_mr_enable(dev->dev, &mr->mmr);
 370         if (err)
 371                 goto err_mr;
 372
 373         mr->ibmr.rkey = mr->ibmr.lkey = mr->mmr.key;
 374         mr->umem = NULL;
 375
 376         return &mr->ibmr;
 377
 378 err_mr:
 379         (void) mlx4_mr_free(dev->dev, &mr->mmr);
 380
 381 err_free:
 382         kfree(mr);
 383         return ERR_PTR(err);
 384 }
 385
 386 struct ib_fast_reg_page_list *mlx4_ib_alloc_fast_reg_page_list(struct ib_device *ibdev,
 387                                                                int page_list_len)
 388 {
 389         struct mlx4_ib_dev *dev = to_mdev(ibdev);
 390         struct mlx4_ib_fast_reg_page_list *mfrpl;
 391         int size = page_list_len * sizeof (u64);
 392
 393         if (page_list_len > MLX4_MAX_FAST_REG_PAGES)
 394                 return ERR_PTR(-EINVAL);
 395
 396         mfrpl = kmalloc(sizeof *mfrpl, GFP_KERNEL);
 397         if (!mfrpl)
 398                 return ERR_PTR(-ENOMEM);
 399
 400         mfrpl->ibfrpl.page_list = kmalloc(size, GFP_KERNEL);
 401         if (!mfrpl->ibfrpl.page_list)
 402                 goto err_free;
 403
 404         mfrpl->mapped_page_list = dma_alloc_coherent(&dev->dev->pdev->dev,
 405                                                      size, &mfrpl->map,
 406                                                      GFP_KERNEL);
 407         if (!mfrpl->mapped_page_list)
 408                 goto err_free;
 409
 410         WARN_ON(mfrpl->map & 0x3f);
 411
 412         return &mfrpl->ibfrpl;
 413
 414 err_free:
 415         kfree(mfrpl->ibfrpl.page_list);
 416         kfree(mfrpl);
 417         return ERR_PTR(-ENOMEM);
 418 }
 419
 420 void mlx4_ib_free_fast_reg_page_list(struct ib_fast_reg_page_list *page_list)
 421 {
 422         struct mlx4_ib_dev *dev = to_mdev(page_list->device);
 423         struct mlx4_ib_fast_reg_page_list *mfrpl = to_mfrpl(page_list);
 424         int size = page_list->max_page_list_len * sizeof (u64);
 425
 426         dma_free_coherent(&dev->dev->pdev->dev, size, mfrpl->mapped_page_list,
 427                           mfrpl->map);
 428         kfree(mfrpl->ibfrpl.page_list);
 429         kfree(mfrpl);
 430 }
 431
 432 struct ib_fmr *mlx4_ib_fmr_alloc(struct ib_pd *pd, int acc,
 433                                  struct ib_fmr_attr *fmr_attr)
 434 {
 435         struct mlx4_ib_dev *dev = to_mdev(pd->device);
 436         struct mlx4_ib_fmr *fmr;
 437         int err = -ENOMEM;
 438
 439         fmr = kmalloc(sizeof *fmr, GFP_KERNEL);
 440         if (!fmr)
 441                 return ERR_PTR(-ENOMEM);
 442
 443         err = mlx4_fmr_alloc(dev->dev, to_mpd(pd)->pdn, convert_access(acc),
 444                              fmr_attr->max_pages, fmr_attr->max_maps,
 445                              fmr_attr->page_shift, &fmr->mfmr);
 446         if (err)
 447                 goto err_free;
 448
 449         err = mlx4_fmr_enable(to_mdev(pd->device)->dev, &fmr->mfmr);
 450         if (err)
 451                 goto err_mr;
 452
 453         fmr->ibfmr.rkey = fmr->ibfmr.lkey = fmr->mfmr.mr.key;
 454
 455         return &fmr->ibfmr;
 456
 457 err_mr:
 458         (void) mlx4_mr_free(to_mdev(pd->device)->dev, &fmr->mfmr.mr);
 459
 460 err_free:
 461         kfree(fmr);
 462
 463         return ERR_PTR(err);
 464 }
 465
 466 int mlx4_ib_map_phys_fmr(struct ib_fmr *ibfmr, u64 *page_list,
 467                       int npages, u64 iova)
 468 {
 469         struct mlx4_ib_fmr *ifmr = to_mfmr(ibfmr);
 470         struct mlx4_ib_dev *dev = to_mdev(ifmr->ibfmr.device);
 471
 472         return mlx4_map_phys_fmr(dev->dev, &ifmr->mfmr, page_list, npages, iova,
 473                                  &ifmr->ibfmr.lkey, &ifmr->ibfmr.rkey);
 474 }
 475
 476 int mlx4_ib_unmap_fmr(struct list_head *fmr_list)
 477 {
 478         struct ib_fmr *ibfmr;
 479         int err;
 480         struct mlx4_dev *mdev = NULL;
 481
 482         list_for_each_entry(ibfmr, fmr_list, list) {
 483                 if (mdev && to_mdev(ibfmr->device)->dev != mdev)
 484                         return -EINVAL;
 485                 mdev = to_mdev(ibfmr->device)->dev;
 486         }
 487
 488         if (!mdev)
 489                 return 0;
 490
 491         list_for_each_entry(ibfmr, fmr_list, list) {
 492                 struct mlx4_ib_fmr *ifmr = to_mfmr(ibfmr);
 493
 494                 mlx4_fmr_unmap(mdev, &ifmr->mfmr, &ifmr->ibfmr.lkey, &ifmr->ibfmr.rkey);
 495         }
 496
 497         /*
 498          * Make sure all MPT status updates are visible before issuing
 499          * SYNC_TPT firmware command.
 500          */
 501         wmb();
 502
 503         err = mlx4_SYNC_TPT(mdev);
 504         if (err)
 505                 pr_warn("SYNC_TPT error %d when "
 506                        "unmapping FMRs\n", err);
 507
 508         return 0;
 509 }
 510
 511 int mlx4_ib_fmr_dealloc(struct ib_fmr *ibfmr)
 512 {
 513         struct mlx4_ib_fmr *ifmr = to_mfmr(ibfmr);
 514         struct mlx4_ib_dev *dev = to_mdev(ibfmr->device);
 515         int err;
 516
 517         err = mlx4_fmr_free(dev->dev, &ifmr->mfmr);
 518
 519         if (!err)
 520                 kfree(ifmr);
 521
 522         return err;
 523 }