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mr.c

/*
 * Copyright (c) 2007 Cisco Systems, Inc. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include "mlx4_ib.h"

static u32 convert_access(int acc)
{
      return (acc & IB_ACCESS_REMOTE_ATOMIC ? MLX4_PERM_ATOMIC       : 0) |
             (acc & IB_ACCESS_REMOTE_WRITE  ? MLX4_PERM_REMOTE_WRITE : 0) |
             (acc & IB_ACCESS_REMOTE_READ   ? MLX4_PERM_REMOTE_READ  : 0) |
             (acc & IB_ACCESS_LOCAL_WRITE   ? MLX4_PERM_LOCAL_WRITE  : 0) |
             MLX4_PERM_LOCAL_READ;
}

struct ib_mr *mlx4_ib_get_dma_mr(struct ib_pd *pd, int acc)
{
      struct mlx4_ib_mr *mr;
      int err;

      mr = kmalloc(sizeof *mr, GFP_KERNEL);
      if (!mr)
            return ERR_PTR(-ENOMEM);

      err = mlx4_mr_alloc(to_mdev(pd->device)->dev, to_mpd(pd)->pdn, 0,
                      ~0ull, convert_access(acc), 0, 0, &mr->mmr);
      if (err)
            goto err_free;

      err = mlx4_mr_enable(to_mdev(pd->device)->dev, &mr->mmr);
      if (err)
            goto err_mr;

      mr->ibmr.rkey = mr->ibmr.lkey = mr->mmr.key;
      mr->umem = NULL;

      return &mr->ibmr;

err_mr:
      mlx4_mr_free(to_mdev(pd->device)->dev, &mr->mmr);

err_free:
      kfree(mr);

      return ERR_PTR(err);
}

int mlx4_ib_umem_write_mtt(struct mlx4_ib_dev *dev, struct mlx4_mtt *mtt,
                     struct ib_umem *umem)
{
      u64 *pages;
      struct ib_umem_chunk *chunk;
      int i, j, k;
      int n;
      int len;
      int err = 0;

      pages = (u64 *) __get_free_page(GFP_KERNEL);
      if (!pages)
            return -ENOMEM;

      i = n = 0;

      list_for_each_entry(chunk, &umem->chunk_list, list)
            for (j = 0; j < chunk->nmap; ++j) {
                  len = sg_dma_len(&chunk->page_list[j]) >> mtt->page_shift;
                  for (k = 0; k < len; ++k) {
                        pages[i++] = sg_dma_address(&chunk->page_list[j]) +
                              umem->page_size * k;
                        /*
                         * Be friendly to mlx4_write_mtt() and
                         * pass it chunks of appropriate size.
                         */
                        if (i == PAGE_SIZE / sizeof (u64)) {
                              err = mlx4_write_mtt(dev->dev, mtt, n,
                                               i, pages);
                              if (err)
                                    goto out;
                              n += i;
                              i = 0;
                        }
                  }
            }

      if (i)
            err = mlx4_write_mtt(dev->dev, mtt, n, i, pages);

out:
      free_page((unsigned long) pages);
      return err;
}

struct ib_mr *mlx4_ib_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
                          u64 virt_addr, int access_flags,
                          struct ib_udata *udata)
{
      struct mlx4_ib_dev *dev = to_mdev(pd->device);
      struct mlx4_ib_mr *mr;
      int shift;
      int err;
      int n;

      mr = kmalloc(sizeof *mr, GFP_KERNEL);
      if (!mr)
            return ERR_PTR(-ENOMEM);

      mr->umem = ib_umem_get(pd->uobject->context, start, length, access_flags);
      if (IS_ERR(mr->umem)) {
            err = PTR_ERR(mr->umem);
            goto err_free;
      }

      n = ib_umem_page_count(mr->umem);
      shift = ilog2(mr->umem->page_size);

      err = mlx4_mr_alloc(dev->dev, to_mpd(pd)->pdn, virt_addr, length,
                      convert_access(access_flags), n, shift, &mr->mmr);
      if (err)
            goto err_umem;

      err = mlx4_ib_umem_write_mtt(dev, &mr->mmr.mtt, mr->umem);
      if (err)
            goto err_mr;

      err = mlx4_mr_enable(dev->dev, &mr->mmr);
      if (err)
            goto err_mr;

      mr->ibmr.rkey = mr->ibmr.lkey = mr->mmr.key;

      return &mr->ibmr;

err_mr:
      mlx4_mr_free(to_mdev(pd->device)->dev, &mr->mmr);

err_umem:
      ib_umem_release(mr->umem);

err_free:
      kfree(mr);

      return ERR_PTR(err);
}

int mlx4_ib_dereg_mr(struct ib_mr *ibmr)
{
      struct mlx4_ib_mr *mr = to_mmr(ibmr);

      mlx4_mr_free(to_mdev(ibmr->device)->dev, &mr->mmr);
      if (mr->umem)
            ib_umem_release(mr->umem);
      kfree(mr);

      return 0;
}

struct ib_fmr *mlx4_ib_fmr_alloc(struct ib_pd *pd, int acc,
                         struct ib_fmr_attr *fmr_attr)
{
      struct mlx4_ib_dev *dev = to_mdev(pd->device);
      struct mlx4_ib_fmr *fmr;
      int err = -ENOMEM;

      fmr = kmalloc(sizeof *fmr, GFP_KERNEL);
      if (!fmr)
            return ERR_PTR(-ENOMEM);

      err = mlx4_fmr_alloc(dev->dev, to_mpd(pd)->pdn, convert_access(acc),
                       fmr_attr->max_pages, fmr_attr->max_maps,
                       fmr_attr->page_shift, &fmr->mfmr);
      if (err)
            goto err_free;

      err = mlx4_mr_enable(to_mdev(pd->device)->dev, &fmr->mfmr.mr);
      if (err)
            goto err_mr;

      fmr->ibfmr.rkey = fmr->ibfmr.lkey = fmr->mfmr.mr.key;

      return &fmr->ibfmr;

err_mr:
      mlx4_mr_free(to_mdev(pd->device)->dev, &fmr->mfmr.mr);

err_free:
      kfree(fmr);

      return ERR_PTR(err);
}

int mlx4_ib_map_phys_fmr(struct ib_fmr *ibfmr, u64 *page_list,
                  int npages, u64 iova)
{
      struct mlx4_ib_fmr *ifmr = to_mfmr(ibfmr);
      struct mlx4_ib_dev *dev = to_mdev(ifmr->ibfmr.device);

      return mlx4_map_phys_fmr(dev->dev, &ifmr->mfmr, page_list, npages, iova,
                         &ifmr->ibfmr.lkey, &ifmr->ibfmr.rkey);
}

int mlx4_ib_unmap_fmr(struct list_head *fmr_list)
{
      struct ib_fmr *ibfmr;
      int err;
      struct mlx4_dev *mdev = NULL;

      list_for_each_entry(ibfmr, fmr_list, list) {
            if (mdev && to_mdev(ibfmr->device)->dev != mdev)
                  return -EINVAL;
            mdev = to_mdev(ibfmr->device)->dev;
      }

      if (!mdev)
            return 0;

      list_for_each_entry(ibfmr, fmr_list, list) {
            struct mlx4_ib_fmr *ifmr = to_mfmr(ibfmr);

            mlx4_fmr_unmap(mdev, &ifmr->mfmr, &ifmr->ibfmr.lkey, &ifmr->ibfmr.rkey);
      }

      /*
       * Make sure all MPT status updates are visible before issuing
       * SYNC_TPT firmware command.
       */
      wmb();

      err = mlx4_SYNC_TPT(mdev);
      if (err)
            printk(KERN_WARNING "mlx4_ib: SYNC_TPT error %d when "
                   "unmapping FMRs\n", err);

      return 0;
}

int mlx4_ib_fmr_dealloc(struct ib_fmr *ibfmr)
{
      struct mlx4_ib_fmr *ifmr = to_mfmr(ibfmr);
      struct mlx4_ib_dev *dev = to_mdev(ibfmr->device);
      int err;

      err = mlx4_fmr_free(dev->dev, &ifmr->mfmr);

      if (!err)
            kfree(ifmr);

      return err;
}

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