mlx4_ib_mr.c

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    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 #include <linux/module.h>
   36 #include <linux/sched.h>
   37 
   38 #include <asm/atomic64.h>
   39 
   40 #include "mlx4_ib.h"
   41 
   42 static u32 convert_access(int acc)
   43 {
   44         return (acc & IB_ACCESS_REMOTE_ATOMIC ? MLX4_PERM_ATOMIC       : 0) |
   45                (acc & IB_ACCESS_REMOTE_WRITE  ? MLX4_PERM_REMOTE_WRITE : 0) |
   46                (acc & IB_ACCESS_REMOTE_READ   ? MLX4_PERM_REMOTE_READ  : 0) |
   47                (acc & IB_ACCESS_LOCAL_WRITE   ? MLX4_PERM_LOCAL_WRITE  : 0) |
   48                (acc & IB_ACCESS_MW_BIND       ? MLX4_PERM_BIND_MW      : 0) |
   49                MLX4_PERM_LOCAL_READ;
   50 }
   51 
   52 static enum mlx4_mw_type to_mlx4_type(enum ib_mw_type type)
   53 {
   54         switch (type) {
   55         case IB_MW_TYPE_1:      return MLX4_MW_TYPE_1;
   56         case IB_MW_TYPE_2:      return MLX4_MW_TYPE_2;
   57         default:                return -1;
   58         }
   59 }
   60 
   61 struct ib_mr *mlx4_ib_get_dma_mr(struct ib_pd *pd, int acc)
   62 {
   63         struct mlx4_ib_mr *mr;
   64         int err;
   65 
   66         mr = kzalloc(sizeof(*mr), GFP_KERNEL);
   67         if (!mr)
   68                 return ERR_PTR(-ENOMEM);
   69 
   70         err = mlx4_mr_alloc(to_mdev(pd->device)->dev, to_mpd(pd)->pdn, 0,
   71                             ~0ull, convert_access(acc), 0, 0, &mr->mmr);
   72         if (err)
   73                 goto err_free;
   74 
   75         err = mlx4_mr_enable(to_mdev(pd->device)->dev, &mr->mmr);
   76         if (err)
   77                 goto err_mr;
   78 
   79         mr->ibmr.rkey = mr->ibmr.lkey = mr->mmr.key;
   80         mr->umem = NULL;
   81 
   82         return &mr->ibmr;
   83 
   84 err_mr:
   85         (void) mlx4_mr_free(to_mdev(pd->device)->dev, &mr->mmr);
   86 
   87 err_free:
   88         kfree(mr);
   89 
   90         return ERR_PTR(err);
   91 }
   92 
   93 int mlx4_ib_umem_write_mtt(struct mlx4_ib_dev *dev, struct mlx4_mtt *mtt,
   94                            struct ib_umem *umem)
   95 {
   96         u64 *pages;
   97         int i, k, entry;
   98         int n;
   99         int len;
  100         int err = 0;
  101         struct scatterlist *sg;
  102 
  103         pages = (u64 *) __get_free_page(GFP_KERNEL);
  104         if (!pages)
  105                 return -ENOMEM;
  106 
  107         i = n = 0;
  108 
  109         for_each_sg(umem->sg_head.sgl, sg, umem->nmap, entry) {
  110                 len = sg_dma_len(sg) >> mtt->page_shift;
  111                 for (k = 0; k < len; ++k) {
  112                         pages[i++] = sg_dma_address(sg) +
  113                                 umem->page_size * k;
  114                         /*
  115                          * Be friendly to mlx4_write_mtt() and
  116                          * pass it chunks of appropriate size.
  117                          */
  118                         if (i == PAGE_SIZE / sizeof (u64)) {
  119                                 err = mlx4_write_mtt(dev->dev, mtt, n,
  120                                                      i, pages);
  121                                 if (err)
  122                                         goto out;
  123                                 n += i;
  124                                 i = 0;
  125                         }
  126                 }
  127         }
  128 
  129         if (i)
  130                 err = mlx4_write_mtt(dev->dev, mtt, n, i, pages);
  131 
  132 out:
  133         free_page((unsigned long) pages);
  134         return err;
  135 }
  136 
  137 struct ib_mr *mlx4_ib_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
  138                                   u64 virt_addr, int access_flags,
  139                                   struct ib_udata *udata)
  140 {
  141         struct mlx4_ib_dev *dev = to_mdev(pd->device);
  142         struct mlx4_ib_mr *mr;
  143         int shift;
  144         int err;
  145         int n;
  146 
  147         mr = kzalloc(sizeof(*mr), GFP_KERNEL);
  148         if (!mr)
  149                 return ERR_PTR(-ENOMEM);
  150 
  151         /* Force registering the memory as writable. */
  152         /* Used for memory re-registeration. HCA protects the access */
  153         mr->umem = ib_umem_get(pd->uobject->context, start, length,
  154                                access_flags | IB_ACCESS_LOCAL_WRITE, 0);
  155         if (IS_ERR(mr->umem)) {
  156                 err = PTR_ERR(mr->umem);
  157                 goto err_free;
  158         }
  159 
  160         n = ib_umem_page_count(mr->umem);
  161         shift = ilog2(mr->umem->page_size);
  162 
  163         err = mlx4_mr_alloc(dev->dev, to_mpd(pd)->pdn, virt_addr, length,
  164                             convert_access(access_flags), n, shift, &mr->mmr);
  165         if (err)
  166                 goto err_umem;
  167 
  168         err = mlx4_ib_umem_write_mtt(dev, &mr->mmr.mtt, mr->umem);
  169         if (err)
  170                 goto err_mr;
  171 
  172         err = mlx4_mr_enable(dev->dev, &mr->mmr);
  173         if (err)
  174                 goto err_mr;
  175 
  176         mr->ibmr.rkey = mr->ibmr.lkey = mr->mmr.key;
  177 
  178         return &mr->ibmr;
  179 
  180 err_mr:
  181         (void) mlx4_mr_free(to_mdev(pd->device)->dev, &mr->mmr);
  182 
  183 err_umem:
  184         ib_umem_release(mr->umem);
  185 
  186 err_free:
  187         kfree(mr);
  188 
  189         return ERR_PTR(err);
  190 }
  191 
  192 int mlx4_ib_rereg_user_mr(struct ib_mr *mr, int flags,
  193                           u64 start, u64 length, u64 virt_addr,
  194                           int mr_access_flags, struct ib_pd *pd,
  195                           struct ib_udata *udata)
  196 {
  197         struct mlx4_ib_dev *dev = to_mdev(mr->device);
  198         struct mlx4_ib_mr *mmr = to_mmr(mr);
  199         struct mlx4_mpt_entry *mpt_entry;
  200         struct mlx4_mpt_entry **pmpt_entry = &mpt_entry;
  201         int err;
  202 
  203         /* Since we synchronize this call and mlx4_ib_dereg_mr via uverbs,
  204          * we assume that the calls can't run concurrently. Otherwise, a
  205          * race exists.
  206          */
  207         err =  mlx4_mr_hw_get_mpt(dev->dev, &mmr->mmr, &pmpt_entry);
  208 
  209         if (err)
  210                 return err;
  211 
  212         if (flags & IB_MR_REREG_PD) {
  213                 err = mlx4_mr_hw_change_pd(dev->dev, *pmpt_entry,
  214                                            to_mpd(pd)->pdn);
  215 
  216                 if (err)
  217                         goto release_mpt_entry;
  218         }
  219 
  220         if (flags & IB_MR_REREG_ACCESS) {
  221                 err = mlx4_mr_hw_change_access(dev->dev, *pmpt_entry,
  222                                                convert_access(mr_access_flags));
  223 
  224                 if (err)
  225                         goto release_mpt_entry;
  226         }
  227 
  228         if (flags & IB_MR_REREG_TRANS) {
  229                 int shift;
  230                 int n;
  231 
  232                 mlx4_mr_rereg_mem_cleanup(dev->dev, &mmr->mmr);
  233                 ib_umem_release(mmr->umem);
  234                 mmr->umem = ib_umem_get(mr->uobject->context, start, length,
  235                                         mr_access_flags |
  236                                         IB_ACCESS_LOCAL_WRITE,
  237                                         0);
  238                 if (IS_ERR(mmr->umem)) {
  239                         err = PTR_ERR(mmr->umem);
  240                         /* Prevent mlx4_ib_dereg_mr from free'ing invalid pointer */
  241                         mmr->umem = NULL;
  242                         goto release_mpt_entry;
  243                 }
  244                 n = ib_umem_page_count(mmr->umem);
  245                 shift = ilog2(mmr->umem->page_size);
  246 
  247                 err = mlx4_mr_rereg_mem_write(dev->dev, &mmr->mmr,
  248                                               virt_addr, length, n, shift,
  249                                               *pmpt_entry);
  250                 if (err) {
  251                         ib_umem_release(mmr->umem);
  252                         goto release_mpt_entry;
  253                 }
  254                 mmr->mmr.iova       = virt_addr;
  255                 mmr->mmr.size       = length;
  256 
  257                 err = mlx4_ib_umem_write_mtt(dev, &mmr->mmr.mtt, mmr->umem);
  258                 if (err) {
  259                         mlx4_mr_rereg_mem_cleanup(dev->dev, &mmr->mmr);
  260                         ib_umem_release(mmr->umem);
  261                         goto release_mpt_entry;
  262                 }
  263         }
  264 
  265         /* If we couldn't transfer the MR to the HCA, just remember to
  266          * return a failure. But dereg_mr will free the resources.
  267          */
  268         err = mlx4_mr_hw_write_mpt(dev->dev, &mmr->mmr, pmpt_entry);
  269         if (!err && flags & IB_MR_REREG_ACCESS)
  270                 mmr->mmr.access = mr_access_flags;
  271 
  272 release_mpt_entry:
  273         mlx4_mr_hw_put_mpt(dev->dev, pmpt_entry);
  274 
  275         return err;
  276 }
  277 
  278 static int
  279 mlx4_alloc_priv_pages(struct ib_device *device,
  280                       struct mlx4_ib_mr *mr,
  281                       int max_pages)
  282 {
  283         int ret;
  284 
  285         /* Ensure that size is aligned to DMA cacheline
  286          * requirements.
  287          * max_pages is limited to MLX4_MAX_FAST_REG_PAGES
  288          * so page_map_size will never cross PAGE_SIZE.
  289          */
  290         mr->page_map_size = roundup(max_pages * sizeof(u64),
  291                                     MLX4_MR_PAGES_ALIGN);
  292 
  293         /* Prevent cross page boundary allocation. */
  294         mr->pages = (__be64 *)get_zeroed_page(GFP_KERNEL);
  295         if (!mr->pages)
  296                 return -ENOMEM;
  297 
  298         mr->page_map = dma_map_single(device->dma_device, mr->pages,
  299                                       mr->page_map_size, DMA_TO_DEVICE);
  300 
  301         if (dma_mapping_error(device->dma_device, mr->page_map)) {
  302                 ret = -ENOMEM;
  303                 goto err;
  304         }
  305 
  306         return 0;
  307 
  308 err:
  309         free_page((unsigned long)mr->pages);
  310         return ret;
  311 }
  312 
  313 static void
  314 mlx4_free_priv_pages(struct mlx4_ib_mr *mr)
  315 {
  316         if (mr->pages) {
  317                 struct ib_device *device = mr->ibmr.device;
  318 
  319                 dma_unmap_single(device->dma_device, mr->page_map,
  320                                  mr->page_map_size, DMA_TO_DEVICE);
  321                 free_page((unsigned long)mr->pages);
  322                 mr->pages = NULL;
  323         }
  324 }
  325 
  326 int mlx4_ib_dereg_mr(struct ib_mr *ibmr, struct ib_udata *udata)
  327 {
  328         struct mlx4_ib_mr *mr = to_mmr(ibmr);
  329         int ret;
  330 
  331         mlx4_free_priv_pages(mr);
  332 
  333         ret = mlx4_mr_free(to_mdev(ibmr->device)->dev, &mr->mmr);
  334         if (ret)
  335                 return ret;
  336         if (mr->umem)
  337                 ib_umem_release(mr->umem);
  338         kfree(mr);
  339 
  340         return 0;
  341 }
  342 
  343 struct ib_mw *mlx4_ib_alloc_mw(struct ib_pd *pd, enum ib_mw_type type,
  344                                struct ib_udata *udata)
  345 {
  346         struct mlx4_ib_dev *dev = to_mdev(pd->device);
  347         struct mlx4_ib_mw *mw;
  348         int err;
  349 
  350         mw = kmalloc(sizeof(*mw), GFP_KERNEL);
  351         if (!mw)
  352                 return ERR_PTR(-ENOMEM);
  353 
  354         err = mlx4_mw_alloc(dev->dev, to_mpd(pd)->pdn,
  355                             to_mlx4_type(type), &mw->mmw);
  356         if (err)
  357                 goto err_free;
  358 
  359         err = mlx4_mw_enable(dev->dev, &mw->mmw);
  360         if (err)
  361                 goto err_mw;
  362 
  363         mw->ibmw.rkey = mw->mmw.key;
  364 
  365         return &mw->ibmw;
  366 
  367 err_mw:
  368         mlx4_mw_free(dev->dev, &mw->mmw);
  369 
  370 err_free:
  371         kfree(mw);
  372 
  373         return ERR_PTR(err);
  374 }
  375 
  376 int mlx4_ib_dealloc_mw(struct ib_mw *ibmw)
  377 {
  378         struct mlx4_ib_mw *mw = to_mmw(ibmw);
  379 
  380         mlx4_mw_free(to_mdev(ibmw->device)->dev, &mw->mmw);
  381         kfree(mw);
  382 
  383         return 0;
  384 }
  385 
  386 struct ib_mr *mlx4_ib_alloc_mr(struct ib_pd *pd, enum ib_mr_type mr_type,
  387                                u32 max_num_sg, struct ib_udata *udata)
  388 {
  389         struct mlx4_ib_dev *dev = to_mdev(pd->device);
  390         struct mlx4_ib_mr *mr;
  391         int err;
  392 
  393         if (mr_type != IB_MR_TYPE_MEM_REG ||
  394             max_num_sg > MLX4_MAX_FAST_REG_PAGES)
  395                 return ERR_PTR(-EINVAL);
  396 
  397         mr = kzalloc(sizeof(*mr), GFP_KERNEL);
  398         if (!mr)
  399                 return ERR_PTR(-ENOMEM);
  400 
  401         err = mlx4_mr_alloc(dev->dev, to_mpd(pd)->pdn, 0, 0, 0,
  402                             max_num_sg, 0, &mr->mmr);
  403         if (err)
  404                 goto err_free;
  405 
  406         err = mlx4_alloc_priv_pages(pd->device, mr, max_num_sg);
  407         if (err)
  408                 goto err_free_mr;
  409 
  410         mr->max_pages = max_num_sg;
  411         err = mlx4_mr_enable(dev->dev, &mr->mmr);
  412         if (err)
  413                 goto err_free_pl;
  414 
  415         mr->ibmr.rkey = mr->ibmr.lkey = mr->mmr.key;
  416         mr->umem = NULL;
  417 
  418         return &mr->ibmr;
  419 
  420 err_free_pl:
  421         mr->ibmr.device = pd->device;
  422         mlx4_free_priv_pages(mr);
  423 err_free_mr:
  424         (void) mlx4_mr_free(dev->dev, &mr->mmr);
  425 err_free:
  426         kfree(mr);
  427         return ERR_PTR(err);
  428 }
  429 
  430 struct ib_fmr *mlx4_ib_fmr_alloc(struct ib_pd *pd, int acc,
  431                                  struct ib_fmr_attr *fmr_attr)
  432 {
  433         struct mlx4_ib_dev *dev = to_mdev(pd->device);
  434         struct mlx4_ib_fmr *fmr;
  435         int err = -ENOMEM;
  436 
  437         fmr = kmalloc(sizeof *fmr, GFP_KERNEL);
  438         if (!fmr)
  439                 return ERR_PTR(-ENOMEM);
  440 
  441         err = mlx4_fmr_alloc(dev->dev, to_mpd(pd)->pdn, convert_access(acc),
  442                              fmr_attr->max_pages, fmr_attr->max_maps,
  443                              fmr_attr->page_shift, &fmr->mfmr);
  444         if (err)
  445                 goto err_free;
  446 
  447         err = mlx4_fmr_enable(to_mdev(pd->device)->dev, &fmr->mfmr);
  448         if (err)
  449                 goto err_mr;
  450 
  451         fmr->ibfmr.rkey = fmr->ibfmr.lkey = fmr->mfmr.mr.key;
  452 
  453         return &fmr->ibfmr;
  454 
  455 err_mr:
  456         (void) mlx4_mr_free(to_mdev(pd->device)->dev, &fmr->mfmr.mr);
  457 
  458 err_free:
  459         kfree(fmr);
  460 
  461         return ERR_PTR(err);
  462 }
  463 
  464 int mlx4_ib_map_phys_fmr(struct ib_fmr *ibfmr, u64 *page_list,
  465                       int npages, u64 iova)
  466 {
  467         struct mlx4_ib_fmr *ifmr = to_mfmr(ibfmr);
  468         struct mlx4_ib_dev *dev = to_mdev(ifmr->ibfmr.device);
  469 
  470         return mlx4_map_phys_fmr(dev->dev, &ifmr->mfmr, page_list, npages, iova,
  471                                  &ifmr->ibfmr.lkey, &ifmr->ibfmr.rkey);
  472 }
  473 
  474 int mlx4_ib_unmap_fmr(struct list_head *fmr_list)
  475 {
  476         struct ib_fmr *ibfmr;
  477         int err;
  478         struct mlx4_dev *mdev = NULL;
  479 
  480         list_for_each_entry(ibfmr, fmr_list, list) {
  481                 if (mdev && to_mdev(ibfmr->device)->dev != mdev)
  482                         return -EINVAL;
  483                 mdev = to_mdev(ibfmr->device)->dev;
  484         }
  485 
  486         if (!mdev)
  487                 return 0;
  488 
  489         list_for_each_entry(ibfmr, fmr_list, list) {
  490                 struct mlx4_ib_fmr *ifmr = to_mfmr(ibfmr);
  491 
  492                 mlx4_fmr_unmap(mdev, &ifmr->mfmr, &ifmr->ibfmr.lkey, &ifmr->ibfmr.rkey);
  493         }
  494 
  495         /*
  496          * Make sure all MPT status updates are visible before issuing
  497          * SYNC_TPT firmware command.
  498          */
  499         wmb();
  500 
  501         err = mlx4_SYNC_TPT(mdev);
  502         if (err)
  503                 pr_warn("SYNC_TPT error %d when "
  504                        "unmapping FMRs\n", err);
  505 
  506         return 0;
  507 }
  508 
  509 int mlx4_ib_fmr_dealloc(struct ib_fmr *ibfmr)
  510 {
  511         struct mlx4_ib_fmr *ifmr = to_mfmr(ibfmr);
  512         struct mlx4_ib_dev *dev = to_mdev(ibfmr->device);
  513         int err;
  514 
  515         err = mlx4_fmr_free(dev->dev, &ifmr->mfmr);
  516 
  517         if (!err)
  518                 kfree(ifmr);
  519 
  520         return err;
  521 }
  522 
  523 static int mlx4_set_page(struct ib_mr *ibmr, u64 addr)
  524 {
  525         struct mlx4_ib_mr *mr = to_mmr(ibmr);
  526 
  527         if (unlikely(mr->npages == mr->max_pages))
  528                 return -ENOMEM;
  529 
  530         mr->pages[mr->npages++] = cpu_to_be64(addr | MLX4_MTT_FLAG_PRESENT);
  531 
  532         return 0;
  533 }
  534 
  535 int mlx4_ib_map_mr_sg(struct ib_mr *ibmr, struct scatterlist *sg, int sg_nents,
  536                       unsigned int *sg_offset)
  537 {
  538         struct mlx4_ib_mr *mr = to_mmr(ibmr);
  539         int rc;
  540 
  541         mr->npages = 0;
  542 
  543         ib_dma_sync_single_for_cpu(ibmr->device, mr->page_map,
  544                                    mr->page_map_size, DMA_TO_DEVICE);
  545 
  546         rc = ib_sg_to_pages(ibmr, sg, sg_nents, sg_offset, mlx4_set_page);
  547 
  548         ib_dma_sync_single_for_device(ibmr->device, mr->page_map,
  549                                       mr->page_map_size, DMA_TO_DEVICE);
  550 
  551         return rc;
  552 }
Cache object: 2834d9e9492b3b7fcf57a9af5318b12d
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FreeBSD/Linux Kernel Cross Reference sys/dev/mlx4/mlx4_ib/mlx4_ib_mr.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/mlx4/mlx4_ib/mlx4_ib_mr.c
