mthca_mr.c

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/*
 * Copyright (c) 2004 Topspin Communications.  All rights reserved.
 * Copyright (c) 2005 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 <linux/errno.h>

#include "mthca_dev.h"
#include "mthca_cmd.h"
#include "mthca_memfree.h"

struct mthca_mtt {
    struct mthca_buddy *buddy;
    int                 order;
    u32                 first_seg;
};

/*
 * Must be packed because mtt_seg is 64 bits but only aligned to 32 bits.
 */
struct mthca_mpt_entry {
    __be32 flags;
    __be32 page_size;
    __be32 key;
    __be32 pd;
    __be64 start;
    __be64 length;
    __be32 lkey;
    __be32 window_count;
    __be32 window_count_limit;
    __be64 mtt_seg;
    __be32 mtt_sz;      /* Arbel only */
    u32    reserved[2];
} __attribute__((packed));

#define MTHCA_MPT_FLAG_SW_OWNS       (0xfUL << 28)
#define MTHCA_MPT_FLAG_MIO           (1 << 17)
#define MTHCA_MPT_FLAG_BIND_ENABLE   (1 << 15)
#define MTHCA_MPT_FLAG_PHYSICAL      (1 <<  9)
#define MTHCA_MPT_FLAG_REGION        (1 <<  8)

#define MTHCA_MTT_FLAG_PRESENT       1

#define MTHCA_MPT_STATUS_SW 0xF0
#define MTHCA_MPT_STATUS_HW 0x00

#define SINAI_FMR_KEY_INC 0x1000000

/*
 * Buddy allocator for MTT segments (currently not very efficient
 * since it doesn't keep a free list and just searches linearly
 * through the bitmaps)
 */

static u32 mthca_buddy_alloc(struct mthca_buddy *buddy, int order)
{
    int o;
    int m;
    u32 seg;

    spin_lock(&buddy->lock);

    for (o = order; o <= buddy->max_order; ++o)
        if (buddy->num_free[o]) {
            m = 1 << (buddy->max_order - o);
            seg = find_first_bit(buddy->bits[o], m);
            if (seg < m)
                goto found;
        }

    spin_unlock(&buddy->lock);
    return -1;

 found:
    clear_bit(seg, buddy->bits[o]);
    --buddy->num_free[o];

    while (o > order) {
        --o;
        seg <<= 1;
        set_bit(seg ^ 1, buddy->bits[o]);
        ++buddy->num_free[o];
    }

    spin_unlock(&buddy->lock);

    seg <<= order;

    return seg;
}

static void mthca_buddy_free(struct mthca_buddy *buddy, u32 seg, int order)
{
    seg >>= order;

    spin_lock(&buddy->lock);

    while (test_bit(seg ^ 1, buddy->bits[order])) {
        clear_bit(seg ^ 1, buddy->bits[order]);
        --buddy->num_free[order];
        seg >>= 1;
        ++order;
    }

    set_bit(seg, buddy->bits[order]);
    ++buddy->num_free[order];

    spin_unlock(&buddy->lock);
}

static int mthca_buddy_init(struct mthca_buddy *buddy, int max_order)
{
    int i, s;

    buddy->max_order = max_order;
    spin_lock_init(&buddy->lock);

    buddy->bits = kzalloc((buddy->max_order + 1) * sizeof (long *),
                  GFP_KERNEL);
    buddy->num_free = kcalloc((buddy->max_order + 1), sizeof *buddy->num_free,
                  GFP_KERNEL);
    if (!buddy->bits || !buddy->num_free)
        goto err_out;

    for (i = 0; i <= buddy->max_order; ++i) {
        s = BITS_TO_LONGS(1 << (buddy->max_order - i));
        buddy->bits[i] = kmalloc(s * sizeof (long), GFP_KERNEL);
        if (!buddy->bits[i])
            goto err_out_free;
        bitmap_zero(buddy->bits[i],
                1 << (buddy->max_order - i));
    }

    set_bit(0, buddy->bits[buddy->max_order]);
    buddy->num_free[buddy->max_order] = 1;

    return 0;

err_out_free:
    for (i = 0; i <= buddy->max_order; ++i)
        kfree(buddy->bits[i]);

err_out:
    kfree(buddy->bits);
    kfree(buddy->num_free);

    return -ENOMEM;
}

static void mthca_buddy_cleanup(struct mthca_buddy *buddy)
{
    int i;

    for (i = 0; i <= buddy->max_order; ++i)
        kfree(buddy->bits[i]);

    kfree(buddy->bits);
    kfree(buddy->num_free);
}

static u32 mthca_alloc_mtt_range(struct mthca_dev *dev, int order,
                 struct mthca_buddy *buddy)
{
    u32 seg = mthca_buddy_alloc(buddy, order);

    if (seg == -1)
        return -1;

    if (mthca_is_memfree(dev))
        if (mthca_table_get_range(dev, dev->mr_table.mtt_table, seg,
                      seg + (1 << order) - 1)) {
            mthca_buddy_free(buddy, seg, order);
            seg = -1;
        }

    return seg;
}

static struct mthca_mtt *__mthca_alloc_mtt(struct mthca_dev *dev, int size,
                       struct mthca_buddy *buddy)
{
    struct mthca_mtt *mtt;
    int i;

    if (size <= 0)
        return ERR_PTR(-EINVAL);

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

    mtt->buddy = buddy;
    mtt->order = 0;
    for (i = dev->limits.mtt_seg_size / 8; i < size; i <<= 1)
        ++mtt->order;

    mtt->first_seg = mthca_alloc_mtt_range(dev, mtt->order, buddy);
    if (mtt->first_seg == -1) {
        kfree(mtt);
        return ERR_PTR(-ENOMEM);
    }

    return mtt;
}

struct mthca_mtt *mthca_alloc_mtt(struct mthca_dev *dev, int size)
{
    return __mthca_alloc_mtt(dev, size, &dev->mr_table.mtt_buddy);
}

void mthca_free_mtt(struct mthca_dev *dev, struct mthca_mtt *mtt)
{
    if (!mtt)
        return;

    mthca_buddy_free(mtt->buddy, mtt->first_seg, mtt->order);

    mthca_table_put_range(dev, dev->mr_table.mtt_table,
                  mtt->first_seg,
                  mtt->first_seg + (1 << mtt->order) - 1);

    kfree(mtt);
}

static int __mthca_write_mtt(struct mthca_dev *dev, struct mthca_mtt *mtt,
                 int start_index, u64 *buffer_list, int list_len)
{
    struct mthca_mailbox *mailbox;
    __be64 *mtt_entry;
    int err = 0;
    int i;

    mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
    if (IS_ERR(mailbox))
        return PTR_ERR(mailbox);
    mtt_entry = mailbox->buf;

    while (list_len > 0) {
        mtt_entry[0] = cpu_to_be64(dev->mr_table.mtt_base +
                       mtt->first_seg * dev->limits.mtt_seg_size +
                       start_index * 8);
        mtt_entry[1] = 0;
        for (i = 0; i < list_len && i < MTHCA_MAILBOX_SIZE / 8 - 2; ++i)
            mtt_entry[i + 2] = cpu_to_be64(buffer_list[i] |
                               MTHCA_MTT_FLAG_PRESENT);

        /*
         * If we have an odd number of entries to write, add
         * one more dummy entry for firmware efficiency.
         */
        if (i & 1)
            mtt_entry[i + 2] = 0;

        err = mthca_WRITE_MTT(dev, mailbox, (i + 1) & ~1);
        if (err) {
            mthca_warn(dev, "WRITE_MTT failed (%d)\n", err);
            goto out;
        }

        list_len    -= i;
        start_index += i;
        buffer_list += i;
    }

out:
    mthca_free_mailbox(dev, mailbox);
    return err;
}

int mthca_write_mtt_size(struct mthca_dev *dev)
{
    if (dev->mr_table.fmr_mtt_buddy != &dev->mr_table.mtt_buddy ||
        !(dev->mthca_flags & MTHCA_FLAG_FMR))
        /*
         * Be friendly to WRITE_MTT command
         * and leave two empty slots for the
         * index and reserved fields of the
         * mailbox.
         */
        return PAGE_SIZE / sizeof (u64) - 2;

    /* For Arbel, all MTTs must fit in the same page. */
    return mthca_is_memfree(dev) ? (PAGE_SIZE / sizeof (u64)) : 0x7ffffff;
}

static void mthca_tavor_write_mtt_seg(struct mthca_dev *dev,
                      struct mthca_mtt *mtt, int start_index,
                      u64 *buffer_list, int list_len)
{
    u64 __iomem *mtts;
    int i;

    mtts = dev->mr_table.tavor_fmr.mtt_base + mtt->first_seg * dev->limits.mtt_seg_size +
        start_index * sizeof (u64);
    for (i = 0; i < list_len; ++i)
        mthca_write64_raw(cpu_to_be64(buffer_list[i] | MTHCA_MTT_FLAG_PRESENT),
                  mtts + i);
}

static void mthca_arbel_write_mtt_seg(struct mthca_dev *dev,
                      struct mthca_mtt *mtt, int start_index,
                      u64 *buffer_list, int list_len)
{
    __be64 *mtts;
    dma_addr_t dma_handle;
    int i;
    int s = start_index * sizeof (u64);

    /* For Arbel, all MTTs must fit in the same page. */
    BUG_ON(s / PAGE_SIZE != (s + list_len * sizeof(u64) - 1) / PAGE_SIZE);
    /* Require full segments */
    BUG_ON(s % dev->limits.mtt_seg_size);

    mtts = mthca_table_find(dev->mr_table.mtt_table, mtt->first_seg +
                s / dev->limits.mtt_seg_size, &dma_handle);

    BUG_ON(!mtts);

    dma_sync_single_for_cpu(&dev->pdev->dev, dma_handle,
                list_len * sizeof (u64), DMA_TO_DEVICE);

    for (i = 0; i < list_len; ++i)
        mtts[i] = cpu_to_be64(buffer_list[i] | MTHCA_MTT_FLAG_PRESENT);

    dma_sync_single_for_device(&dev->pdev->dev, dma_handle,
                   list_len * sizeof (u64), DMA_TO_DEVICE);
}

int mthca_write_mtt(struct mthca_dev *dev, struct mthca_mtt *mtt,
            int start_index, u64 *buffer_list, int list_len)
{
    int size = mthca_write_mtt_size(dev);
    int chunk;

    if (dev->mr_table.fmr_mtt_buddy != &dev->mr_table.mtt_buddy ||
        !(dev->mthca_flags & MTHCA_FLAG_FMR))
        return __mthca_write_mtt(dev, mtt, start_index, buffer_list, list_len);

    while (list_len > 0) {
        chunk = min(size, list_len);
        if (mthca_is_memfree(dev))
            mthca_arbel_write_mtt_seg(dev, mtt, start_index,
                          buffer_list, chunk);
        else
            mthca_tavor_write_mtt_seg(dev, mtt, start_index,
                          buffer_list, chunk);

        list_len    -= chunk;
        start_index += chunk;
        buffer_list += chunk;
    }

    return 0;
}

static inline u32 tavor_hw_index_to_key(u32 ind)
{
    return ind;
}

static inline u32 tavor_key_to_hw_index(u32 key)
{
    return key;
}

static inline u32 arbel_hw_index_to_key(u32 ind)
{
    return (ind >> 24) | (ind << 8);
}

static inline u32 arbel_key_to_hw_index(u32 key)
{
    return (key << 24) | (key >> 8);
}

static inline u32 hw_index_to_key(struct mthca_dev *dev, u32 ind)
{
    if (mthca_is_memfree(dev))
        return arbel_hw_index_to_key(ind);
    else
        return tavor_hw_index_to_key(ind);
}

static inline u32 key_to_hw_index(struct mthca_dev *dev, u32 key)
{
    if (mthca_is_memfree(dev))
        return arbel_key_to_hw_index(key);
    else
        return tavor_key_to_hw_index(key);
}

static inline u32 adjust_key(struct mthca_dev *dev, u32 key)
{
    if (dev->mthca_flags & MTHCA_FLAG_SINAI_OPT)
        return ((key << 20) & 0x800000) | (key & 0x7fffff);
    else
        return key;
}

int mthca_mr_alloc(struct mthca_dev *dev, u32 pd, int buffer_size_shift,
           u64 iova, u64 total_size, u32 access, struct mthca_mr *mr)
{
    struct mthca_mailbox *mailbox;
    struct mthca_mpt_entry *mpt_entry;
    u32 key;
    int i;
    int err;

    WARN_ON(buffer_size_shift >= 32);

    key = mthca_alloc(&dev->mr_table.mpt_alloc);
    if (key == -1)
        return -ENOMEM;
    key = adjust_key(dev, key);
    mr->ibmr.rkey = mr->ibmr.lkey = hw_index_to_key(dev, key);

    if (mthca_is_memfree(dev)) {
        err = mthca_table_get(dev, dev->mr_table.mpt_table, key);
        if (err)
            goto err_out_mpt_free;
    }

    mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
    if (IS_ERR(mailbox)) {
        err = PTR_ERR(mailbox);
        goto err_out_table;
    }
    mpt_entry = mailbox->buf;

    mpt_entry->flags = cpu_to_be32(MTHCA_MPT_FLAG_SW_OWNS     |
                       MTHCA_MPT_FLAG_MIO         |
                       MTHCA_MPT_FLAG_REGION      |
                       access);
    if (!mr->mtt)
        mpt_entry->flags |= cpu_to_be32(MTHCA_MPT_FLAG_PHYSICAL);

    mpt_entry->page_size = cpu_to_be32(buffer_size_shift - 12);
    mpt_entry->key       = cpu_to_be32(key);
    mpt_entry->pd        = cpu_to_be32(pd);
    mpt_entry->start     = cpu_to_be64(iova);
    mpt_entry->length    = cpu_to_be64(total_size);

    memset(&mpt_entry->lkey, 0,
           sizeof *mpt_entry - offsetof(struct mthca_mpt_entry, lkey));

    if (mr->mtt)
        mpt_entry->mtt_seg =
            cpu_to_be64(dev->mr_table.mtt_base +
                    mr->mtt->first_seg * dev->limits.mtt_seg_size);

    if (0) {
        mthca_dbg(dev, "Dumping MPT entry %08x:\n", mr->ibmr.lkey);
        for (i = 0; i < sizeof (struct mthca_mpt_entry) / 4; ++i) {
            if (i % 4 == 0)
                printk("[%02x] ", i * 4);
            printk(" %08x", be32_to_cpu(((__be32 *) mpt_entry)[i]));
            if ((i + 1) % 4 == 0)
                printk("\n");
        }
    }

    err = mthca_SW2HW_MPT(dev, mailbox,
                  key & (dev->limits.num_mpts - 1));
    if (err) {
        mthca_warn(dev, "SW2HW_MPT failed (%d)\n", err);
        goto err_out_mailbox;
    }

    mthca_free_mailbox(dev, mailbox);
    return err;

err_out_mailbox:
    mthca_free_mailbox(dev, mailbox);

err_out_table:
    mthca_table_put(dev, dev->mr_table.mpt_table, key);

err_out_mpt_free:
    mthca_free(&dev->mr_table.mpt_alloc, key);
    return err;
}

int mthca_mr_alloc_notrans(struct mthca_dev *dev, u32 pd,
               u32 access, struct mthca_mr *mr)
{
    mr->mtt = NULL;
    return mthca_mr_alloc(dev, pd, 12, 0, ~0ULL, access, mr);
}

int mthca_mr_alloc_phys(struct mthca_dev *dev, u32 pd,
            u64 *buffer_list, int buffer_size_shift,
            int list_len, u64 iova, u64 total_size,
            u32 access, struct mthca_mr *mr)
{
    int err;

    mr->mtt = mthca_alloc_mtt(dev, list_len);
    if (IS_ERR(mr->mtt))
        return PTR_ERR(mr->mtt);

    err = mthca_write_mtt(dev, mr->mtt, 0, buffer_list, list_len);
    if (err) {
        mthca_free_mtt(dev, mr->mtt);
        return err;
    }

    err = mthca_mr_alloc(dev, pd, buffer_size_shift, iova,
                 total_size, access, mr);
    if (err)
        mthca_free_mtt(dev, mr->mtt);

    return err;
}

/* Free mr or fmr */
static void mthca_free_region(struct mthca_dev *dev, u32 lkey)
{
    mthca_table_put(dev, dev->mr_table.mpt_table,
            key_to_hw_index(dev, lkey));

    mthca_free(&dev->mr_table.mpt_alloc, key_to_hw_index(dev, lkey));
}

void mthca_free_mr(struct mthca_dev *dev, struct mthca_mr *mr)
{
    int err;

    err = mthca_HW2SW_MPT(dev, NULL,
                  key_to_hw_index(dev, mr->ibmr.lkey) &
                  (dev->limits.num_mpts - 1));
    if (err)
        mthca_warn(dev, "HW2SW_MPT failed (%d)\n", err);

    mthca_free_region(dev, mr->ibmr.lkey);
    mthca_free_mtt(dev, mr->mtt);
}

int mthca_fmr_alloc(struct mthca_dev *dev, u32 pd,
            u32 access, struct mthca_fmr *mr)
{
    struct mthca_mpt_entry *mpt_entry;
    struct mthca_mailbox *mailbox;
    u64 mtt_seg;
    u32 key, idx;
    int list_len = mr->attr.max_pages;
    int err = -ENOMEM;
    int i;

    if (mr->attr.page_shift < 12 || mr->attr.page_shift >= 32)
        return -EINVAL;

    /* For Arbel, all MTTs must fit in the same page. */
    if (mthca_is_memfree(dev) &&
        mr->attr.max_pages * sizeof *mr->mem.arbel.mtts > PAGE_SIZE)
        return -EINVAL;

    mr->maps = 0;

    key = mthca_alloc(&dev->mr_table.mpt_alloc);
    if (key == -1)
        return -ENOMEM;
    key = adjust_key(dev, key);

    idx = key & (dev->limits.num_mpts - 1);
    mr->ibmr.rkey = mr->ibmr.lkey = hw_index_to_key(dev, key);

    if (mthca_is_memfree(dev)) {
        err = mthca_table_get(dev, dev->mr_table.mpt_table, key);
        if (err)
            goto err_out_mpt_free;

        mr->mem.arbel.mpt = mthca_table_find(dev->mr_table.mpt_table, key, NULL);
        BUG_ON(!mr->mem.arbel.mpt);
    } else
        mr->mem.tavor.mpt = dev->mr_table.tavor_fmr.mpt_base +
            sizeof *(mr->mem.tavor.mpt) * idx;

    mr->mtt = __mthca_alloc_mtt(dev, list_len, dev->mr_table.fmr_mtt_buddy);
    if (IS_ERR(mr->mtt)) {
        err = PTR_ERR(mr->mtt);
        goto err_out_table;
    }

    mtt_seg = mr->mtt->first_seg * dev->limits.mtt_seg_size;

    if (mthca_is_memfree(dev)) {
        mr->mem.arbel.mtts = mthca_table_find(dev->mr_table.mtt_table,
                              mr->mtt->first_seg,
                              &mr->mem.arbel.dma_handle);
        BUG_ON(!mr->mem.arbel.mtts);
    } else
        mr->mem.tavor.mtts = dev->mr_table.tavor_fmr.mtt_base + mtt_seg;

    mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
    if (IS_ERR(mailbox)) {
        err = PTR_ERR(mailbox);
        goto err_out_free_mtt;
    }

    mpt_entry = mailbox->buf;

    mpt_entry->flags = cpu_to_be32(MTHCA_MPT_FLAG_SW_OWNS     |
                       MTHCA_MPT_FLAG_MIO         |
                       MTHCA_MPT_FLAG_REGION      |
                       access);

    mpt_entry->page_size = cpu_to_be32(mr->attr.page_shift - 12);
    mpt_entry->key       = cpu_to_be32(key);
    mpt_entry->pd        = cpu_to_be32(pd);
    memset(&mpt_entry->start, 0,
           sizeof *mpt_entry - offsetof(struct mthca_mpt_entry, start));
    mpt_entry->mtt_seg   = cpu_to_be64(dev->mr_table.mtt_base + mtt_seg);

    if (0) {
        mthca_dbg(dev, "Dumping MPT entry %08x:\n", mr->ibmr.lkey);
        for (i = 0; i < sizeof (struct mthca_mpt_entry) / 4; ++i) {
            if (i % 4 == 0)
                printk("[%02x] ", i * 4);
            printk(" %08x", be32_to_cpu(((__be32 *) mpt_entry)[i]));
            if ((i + 1) % 4 == 0)
                printk("\n");
        }
    }

    err = mthca_SW2HW_MPT(dev, mailbox,
                  key & (dev->limits.num_mpts - 1));
    if (err) {
        mthca_warn(dev, "SW2HW_MPT failed (%d)\n", err);
        goto err_out_mailbox_free;
    }

    mthca_free_mailbox(dev, mailbox);
    return 0;

err_out_mailbox_free:
    mthca_free_mailbox(dev, mailbox);

err_out_free_mtt:
    mthca_free_mtt(dev, mr->mtt);

err_out_table:
    mthca_table_put(dev, dev->mr_table.mpt_table, key);

err_out_mpt_free:
    mthca_free(&dev->mr_table.mpt_alloc, key);
    return err;
}

int mthca_free_fmr(struct mthca_dev *dev, struct mthca_fmr *fmr)
{
    if (fmr->maps)
        return -EBUSY;

    mthca_free_region(dev, fmr->ibmr.lkey);
    mthca_free_mtt(dev, fmr->mtt);

    return 0;
}

static inline int mthca_check_fmr(struct mthca_fmr *fmr, u64 *page_list,
                  int list_len, u64 iova)
{
    int i, page_mask;

    if (list_len > fmr->attr.max_pages)
        return -EINVAL;

    page_mask = (1 << fmr->attr.page_shift) - 1;

    /* We are getting page lists, so va must be page aligned. */
    if (iova & page_mask)
        return -EINVAL;

    /* Trust the user not to pass misaligned data in page_list */
    if (0)
        for (i = 0; i < list_len; ++i) {
            if (page_list[i] & ~page_mask)
                return -EINVAL;
        }

    if (fmr->maps >= fmr->attr.max_maps)
        return -EINVAL;

    return 0;
}


int mthca_tavor_map_phys_fmr(struct ib_fmr *ibfmr, u64 *page_list,
                 int list_len, u64 iova)
{
    struct mthca_fmr *fmr = to_mfmr(ibfmr);
    struct mthca_dev *dev = to_mdev(ibfmr->device);
    struct mthca_mpt_entry mpt_entry;
    u32 key;
    int i, err;

    err = mthca_check_fmr(fmr, page_list, list_len, iova);
    if (err)
        return err;

    ++fmr->maps;

    key = tavor_key_to_hw_index(fmr->ibmr.lkey);
    key += dev->limits.num_mpts;
    fmr->ibmr.lkey = fmr->ibmr.rkey = tavor_hw_index_to_key(key);

    writeb(MTHCA_MPT_STATUS_SW, fmr->mem.tavor.mpt);

    for (i = 0; i < list_len; ++i) {
        __be64 mtt_entry = cpu_to_be64(page_list[i] |
                           MTHCA_MTT_FLAG_PRESENT);
        mthca_write64_raw(mtt_entry, fmr->mem.tavor.mtts + i);
    }

    mpt_entry.lkey   = cpu_to_be32(key);
    mpt_entry.length = cpu_to_be64(list_len * (1ull << fmr->attr.page_shift));
    mpt_entry.start  = cpu_to_be64(iova);

    __raw_writel((__force u32) mpt_entry.lkey, &fmr->mem.tavor.mpt->key);
    memcpy_toio(&fmr->mem.tavor.mpt->start, &mpt_entry.start,
            offsetof(struct mthca_mpt_entry, window_count) -
            offsetof(struct mthca_mpt_entry, start));

    writeb(MTHCA_MPT_STATUS_HW, fmr->mem.tavor.mpt);

    return 0;
}

int mthca_arbel_map_phys_fmr(struct ib_fmr *ibfmr, u64 *page_list,
                 int list_len, u64 iova)
{
    struct mthca_fmr *fmr = to_mfmr(ibfmr);
    struct mthca_dev *dev = to_mdev(ibfmr->device);
    u32 key;
    int i, err;

    err = mthca_check_fmr(fmr, page_list, list_len, iova);
    if (err)
        return err;

    ++fmr->maps;

    key = arbel_key_to_hw_index(fmr->ibmr.lkey);
    if (dev->mthca_flags & MTHCA_FLAG_SINAI_OPT)
        key += SINAI_FMR_KEY_INC;
    else
        key += dev->limits.num_mpts;
    fmr->ibmr.lkey = fmr->ibmr.rkey = arbel_hw_index_to_key(key);

    *(u8 *) fmr->mem.arbel.mpt = MTHCA_MPT_STATUS_SW;

    wmb();

    dma_sync_single_for_cpu(&dev->pdev->dev, fmr->mem.arbel.dma_handle,
                list_len * sizeof(u64), DMA_TO_DEVICE);

    for (i = 0; i < list_len; ++i)
        fmr->mem.arbel.mtts[i] = cpu_to_be64(page_list[i] |
                             MTHCA_MTT_FLAG_PRESENT);

    dma_sync_single_for_device(&dev->pdev->dev, fmr->mem.arbel.dma_handle,
                   list_len * sizeof(u64), DMA_TO_DEVICE);

    fmr->mem.arbel.mpt->key    = cpu_to_be32(key);
    fmr->mem.arbel.mpt->lkey   = cpu_to_be32(key);
    fmr->mem.arbel.mpt->length = cpu_to_be64(list_len * (1ull << fmr->attr.page_shift));
    fmr->mem.arbel.mpt->start  = cpu_to_be64(iova);

    wmb();

    *(u8 *) fmr->mem.arbel.mpt = MTHCA_MPT_STATUS_HW;

    wmb();

    return 0;
}

void mthca_tavor_fmr_unmap(struct mthca_dev *dev, struct mthca_fmr *fmr)
{
    if (!fmr->maps)
        return;

    fmr->maps = 0;

    writeb(MTHCA_MPT_STATUS_SW, fmr->mem.tavor.mpt);
}

void mthca_arbel_fmr_unmap(struct mthca_dev *dev, struct mthca_fmr *fmr)
{
    if (!fmr->maps)
        return;

    fmr->maps = 0;

    *(u8 *) fmr->mem.arbel.mpt = MTHCA_MPT_STATUS_SW;
}

int mthca_init_mr_table(struct mthca_dev *dev)
{
    phys_addr_t addr;
    int mpts, mtts, err, i;

    err = mthca_alloc_init(&dev->mr_table.mpt_alloc,
                   dev->limits.num_mpts,
                   ~0, dev->limits.reserved_mrws);
    if (err)
        return err;

    if (!mthca_is_memfree(dev) &&
        (dev->mthca_flags & MTHCA_FLAG_DDR_HIDDEN))
        dev->limits.fmr_reserved_mtts = 0;
    else
        dev->mthca_flags |= MTHCA_FLAG_FMR;

    if (dev->mthca_flags & MTHCA_FLAG_SINAI_OPT)
        mthca_dbg(dev, "Memory key throughput optimization activated.\n");

    err = mthca_buddy_init(&dev->mr_table.mtt_buddy,
                   fls(dev->limits.num_mtt_segs - 1));

    if (err)
        goto err_mtt_buddy;

    dev->mr_table.tavor_fmr.mpt_base = NULL;
    dev->mr_table.tavor_fmr.mtt_base = NULL;

    if (dev->limits.fmr_reserved_mtts) {
        i = fls(dev->limits.fmr_reserved_mtts - 1);

        if (i >= 31) {
            mthca_warn(dev, "Unable to reserve 2^31 FMR MTTs.\n");
            err = -EINVAL;
            goto err_fmr_mpt;
        }
        mpts = mtts = 1 << i;
    } else {
        mtts = dev->limits.num_mtt_segs;
        mpts = dev->limits.num_mpts;
    }

    if (!mthca_is_memfree(dev) &&
        (dev->mthca_flags & MTHCA_FLAG_FMR)) {

        addr = pci_resource_start(dev->pdev, 4) +
            ((pci_resource_len(dev->pdev, 4) - 1) &
             dev->mr_table.mpt_base);

        dev->mr_table.tavor_fmr.mpt_base =
            ioremap(addr, mpts * sizeof(struct mthca_mpt_entry));

        if (!dev->mr_table.tavor_fmr.mpt_base) {
            mthca_warn(dev, "MPT ioremap for FMR failed.\n");
            err = -ENOMEM;
            goto err_fmr_mpt;
        }

        addr = pci_resource_start(dev->pdev, 4) +
            ((pci_resource_len(dev->pdev, 4) - 1) &
             dev->mr_table.mtt_base);

        dev->mr_table.tavor_fmr.mtt_base =
            ioremap(addr, mtts * dev->limits.mtt_seg_size);
        if (!dev->mr_table.tavor_fmr.mtt_base) {
            mthca_warn(dev, "MTT ioremap for FMR failed.\n");
            err = -ENOMEM;
            goto err_fmr_mtt;
        }
    }

    if (dev->limits.fmr_reserved_mtts) {
        err = mthca_buddy_init(&dev->mr_table.tavor_fmr.mtt_buddy, fls(mtts - 1));
        if (err)
            goto err_fmr_mtt_buddy;

        /* Prevent regular MRs from using FMR keys */
        err = mthca_buddy_alloc(&dev->mr_table.mtt_buddy, fls(mtts - 1));
        if (err)
            goto err_reserve_fmr;

        dev->mr_table.fmr_mtt_buddy =
            &dev->mr_table.tavor_fmr.mtt_buddy;
    } else
        dev->mr_table.fmr_mtt_buddy = &dev->mr_table.mtt_buddy;

    /* FMR table is always the first, take reserved MTTs out of there */
    if (dev->limits.reserved_mtts) {
        i = fls(dev->limits.reserved_mtts - 1);

        if (mthca_alloc_mtt_range(dev, i,
                      dev->mr_table.fmr_mtt_buddy) == -1) {
            mthca_warn(dev, "MTT table of order %d is too small.\n",
                  dev->mr_table.fmr_mtt_buddy->max_order);
            err = -ENOMEM;
            goto err_reserve_mtts;
        }
    }

    return 0;

err_reserve_mtts:
err_reserve_fmr:
    if (dev->limits.fmr_reserved_mtts)
        mthca_buddy_cleanup(&dev->mr_table.tavor_fmr.mtt_buddy);

err_fmr_mtt_buddy:
    if (dev->mr_table.tavor_fmr.mtt_base)
        iounmap(dev->mr_table.tavor_fmr.mtt_base);

err_fmr_mtt:
    if (dev->mr_table.tavor_fmr.mpt_base)
        iounmap(dev->mr_table.tavor_fmr.mpt_base);

err_fmr_mpt:
    mthca_buddy_cleanup(&dev->mr_table.mtt_buddy);

err_mtt_buddy:
    mthca_alloc_cleanup(&dev->mr_table.mpt_alloc);

    return err;
}

void mthca_cleanup_mr_table(struct mthca_dev *dev)
{
    /* XXX check if any MRs are still allocated? */
    if (dev->limits.fmr_reserved_mtts)
        mthca_buddy_cleanup(&dev->mr_table.tavor_fmr.mtt_buddy);

    mthca_buddy_cleanup(&dev->mr_table.mtt_buddy);

    if (dev->mr_table.tavor_fmr.mtt_base)
        iounmap(dev->mr_table.tavor_fmr.mtt_base);
    if (dev->mr_table.tavor_fmr.mpt_base)
        iounmap(dev->mr_table.tavor_fmr.mpt_base);

    mthca_alloc_cleanup(&dev->mr_table.mpt_alloc);
}