mr.c

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/*
 * Copyright (c) 2007 Cisco Systems, Inc. All rights reserved.
 * Copyright (c) 2007, 2008 Mellanox Technologies. 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 <linux/slab.h>

#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, 0);
    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_mr *mlx4_ib_alloc_fast_reg_mr(struct ib_pd *pd,
                    int max_page_list_len)
{
    struct mlx4_ib_dev *dev = to_mdev(pd->device);
    struct mlx4_ib_mr *mr;
    int err;

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

    err = mlx4_mr_alloc(dev->dev, to_mpd(pd)->pdn, 0, 0, 0,
                max_page_list_len, 0, &mr->mmr);
    if (err)
        goto err_free;

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

err_free:
    kfree(mr);
    return ERR_PTR(err);
}

struct ib_fast_reg_page_list *mlx4_ib_alloc_fast_reg_page_list(struct ib_device *ibdev,
                                   int page_list_len)
{
    struct mlx4_ib_dev *dev = to_mdev(ibdev);
    struct mlx4_ib_fast_reg_page_list *mfrpl;
    int size = page_list_len * sizeof (u64);

    if (page_list_len > MLX4_MAX_FAST_REG_PAGES)
        return ERR_PTR(-EINVAL);

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

    mfrpl->ibfrpl.page_list = kmalloc(size, GFP_KERNEL);
    if (!mfrpl->ibfrpl.page_list)
        goto err_free;

    mfrpl->mapped_page_list = dma_alloc_coherent(&dev->dev->pdev->dev,
                             size, &mfrpl->map,
                             GFP_KERNEL);
    if (!mfrpl->mapped_page_list)
        goto err_free;

    WARN_ON(mfrpl->map & 0x3f);

    return &mfrpl->ibfrpl;

err_free:
    kfree(mfrpl->ibfrpl.page_list);
    kfree(mfrpl);
    return ERR_PTR(-ENOMEM);
}

void mlx4_ib_free_fast_reg_page_list(struct ib_fast_reg_page_list *page_list)
{
    struct mlx4_ib_dev *dev = to_mdev(page_list->device);
    struct mlx4_ib_fast_reg_page_list *mfrpl = to_mfrpl(page_list);
    int size = page_list->max_page_list_len * sizeof (u64);

    dma_free_coherent(&dev->dev->pdev->dev, size, mfrpl->mapped_page_list,
              mfrpl->map);
    kfree(mfrpl->ibfrpl.page_list);
    kfree(mfrpl);
}

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_fmr_enable(to_mdev(pd->device)->dev, &fmr->mfmr);
    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)
        pr_warn("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;
}