/*
 * Copyright (c) 2004 Topspin Communications.  All rights reserved.
 * Copyright (c) 2005, 2006, 2007, 2008 Mellanox Technologies. All rights reserved.
 * Copyright (c) 2006, 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 <linux/errno.h>
#include <linux/export.h>
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/vmalloc.h>

#include <linux/mlx4/cmd.h>

#include "mlx4.h"
#include "icm.h"

static u32 mlx4_buddy_alloc(struct mlx4_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 mlx4_buddy_free(struct mlx4_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 mlx4_buddy_init(struct mlx4_buddy *buddy, int max_order)
{
        int i, s;

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

        buddy->bits = kcalloc(buddy->max_order + 1, sizeof(*buddy->bits),
                              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(1UL << (buddy->max_order - i));
                buddy->bits[i] = kvmalloc_array(s, sizeof(long), GFP_KERNEL | __GFP_ZERO);
                if (!buddy->bits[i])
                        goto err_out_free;
        }

        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)
                kvfree(buddy->bits[i]);

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

        return -ENOMEM;
}

static void mlx4_buddy_cleanup(struct mlx4_buddy *buddy)
{
        int i;

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

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

u32 __mlx4_alloc_mtt_range(struct mlx4_dev *dev, int order)
{
        struct mlx4_mr_table *mr_table = &mlx4_priv(dev)->mr_table;
        u32 seg;
        int seg_order;
        u32 offset;

        seg_order = max_t(int, order - log_mtts_per_seg, 0);

        seg = mlx4_buddy_alloc(&mr_table->mtt_buddy, seg_order);
        if (seg == -1)
                return -1;

        offset = seg * (1 << log_mtts_per_seg);

        if (mlx4_table_get_range(dev, &mr_table->mtt_table, offset,
                                 offset + (1 << order) - 1)) {
                mlx4_buddy_free(&mr_table->mtt_buddy, seg, seg_order);
                return -1;
        }

        return offset;
}

static u32 mlx4_alloc_mtt_range(struct mlx4_dev *dev, int order)
{
        u64 in_param = 0;
        u64 out_param;
        int err;

        if (mlx4_is_mfunc(dev)) {
                set_param_l(&in_param, order);
                err = mlx4_cmd_imm(dev, in_param, &out_param, RES_MTT,
                                                       RES_OP_RESERVE_AND_MAP,
                                                       MLX4_CMD_ALLOC_RES,
                                                       MLX4_CMD_TIME_CLASS_A,
                                                       MLX4_CMD_WRAPPED);
                if (err)
                        return -1;
                return get_param_l(&out_param);
        }
        return __mlx4_alloc_mtt_range(dev, order);
}

int mlx4_mtt_init(struct mlx4_dev *dev, int npages, int page_shift,
                  struct mlx4_mtt *mtt)
{
        int i;

        if (!npages) {
                mtt->order      = -1;
                mtt->page_shift = MLX4_ICM_PAGE_SHIFT;
                return 0;
        } else
                mtt->page_shift = page_shift;

        for (mtt->order = 0, i = 1; i < npages; i <<= 1)
                ++mtt->order;

        mtt->offset = mlx4_alloc_mtt_range(dev, mtt->order);
        if (mtt->offset == -1)
                return -ENOMEM;

        return 0;
}
EXPORT_SYMBOL_GPL(mlx4_mtt_init);

void __mlx4_free_mtt_range(struct mlx4_dev *dev, u32 offset, int order)
{
        u32 first_seg;
        int seg_order;
        struct mlx4_mr_table *mr_table = &mlx4_priv(dev)->mr_table;

        seg_order = max_t(int, order - log_mtts_per_seg, 0);
        first_seg = offset / (1 << log_mtts_per_seg);

        mlx4_buddy_free(&mr_table->mtt_buddy, first_seg, seg_order);
        mlx4_table_put_range(dev, &mr_table->mtt_table, offset,
                             offset + (1 << order) - 1);
}

static void mlx4_free_mtt_range(struct mlx4_dev *dev, u32 offset, int order)
{
        u64 in_param = 0;
        int err;

        if (mlx4_is_mfunc(dev)) {
                set_param_l(&in_param, offset);
                set_param_h(&in_param, order);
                err = mlx4_cmd(dev, in_param, RES_MTT, RES_OP_RESERVE_AND_MAP,
                                                       MLX4_CMD_FREE_RES,
                                                       MLX4_CMD_TIME_CLASS_A,
                                                       MLX4_CMD_WRAPPED);
                if (err)
                        mlx4_warn(dev, "Failed to free mtt range at:%d order:%d\n",
                                  offset, order);
                return;
        }
        __mlx4_free_mtt_range(dev, offset, order);
}

void mlx4_mtt_cleanup(struct mlx4_dev *dev, struct mlx4_mtt *mtt)
{
        if (mtt->order < 0)
                return;

        mlx4_free_mtt_range(dev, mtt->offset, mtt->order);
}
EXPORT_SYMBOL_GPL(mlx4_mtt_cleanup);

u64 mlx4_mtt_addr(struct mlx4_dev *dev, struct mlx4_mtt *mtt)
{
        return (u64) mtt->offset * dev->caps.mtt_entry_sz;
}
EXPORT_SYMBOL_GPL(mlx4_mtt_addr);

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

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

static int mlx4_SW2HW_MPT(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox,
                          int mpt_index)
{
        return mlx4_cmd(dev, mailbox->dma, mpt_index,
                        0, MLX4_CMD_SW2HW_MPT, MLX4_CMD_TIME_CLASS_B,
                        MLX4_CMD_WRAPPED);
}

static int mlx4_HW2SW_MPT(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox,
                          int mpt_index)
{
        return mlx4_cmd_box(dev, 0, mailbox ? mailbox->dma : 0, mpt_index,
                            !mailbox, MLX4_CMD_HW2SW_MPT,
                            MLX4_CMD_TIME_CLASS_B, MLX4_CMD_WRAPPED);
}

/* Must protect against concurrent access */
int mlx4_mr_hw_get_mpt(struct mlx4_dev *dev, struct mlx4_mr *mmr,
                       struct mlx4_mpt_entry ***mpt_entry)
{
        int err;
        int key = key_to_hw_index(mmr->key) & (dev->caps.num_mpts - 1);
        struct mlx4_cmd_mailbox *mailbox = NULL;

        if (mmr->enabled != MLX4_MPT_EN_HW)
                return -EINVAL;

        err = mlx4_HW2SW_MPT(dev, NULL, key);
        if (err) {
                mlx4_warn(dev, "HW2SW_MPT failed (%d).", err);
                mlx4_warn(dev, "Most likely the MR has MWs bound to it.\n");
                return err;
        }

        mmr->enabled = MLX4_MPT_EN_SW;

        if (!mlx4_is_mfunc(dev)) {
                **mpt_entry = mlx4_table_find(
                                &mlx4_priv(dev)->mr_table.dmpt_table,
                                key, NULL);
        } else {
                mailbox = mlx4_alloc_cmd_mailbox(dev);
                if (IS_ERR(mailbox))
                        return PTR_ERR(mailbox);

                err = mlx4_cmd_box(dev, 0, mailbox->dma, key,
                                   0, MLX4_CMD_QUERY_MPT,
                                   MLX4_CMD_TIME_CLASS_B,
                                   MLX4_CMD_WRAPPED);
                if (err)
                        goto free_mailbox;

                *mpt_entry = (struct mlx4_mpt_entry **)&mailbox->buf;
        }

        if (!(*mpt_entry) || !(**mpt_entry)) {
                err = -ENOMEM;
                goto free_mailbox;
        }

        return 0;

free_mailbox:
        mlx4_free_cmd_mailbox(dev, mailbox);
        return err;
}
EXPORT_SYMBOL_GPL(mlx4_mr_hw_get_mpt);

int mlx4_mr_hw_write_mpt(struct mlx4_dev *dev, struct mlx4_mr *mmr,
                         struct mlx4_mpt_entry **mpt_entry)
{
        int err;

        if (!mlx4_is_mfunc(dev)) {
                /* Make sure any changes to this entry are flushed */
                wmb();

                *(u8 *)(*mpt_entry) = MLX4_MPT_STATUS_HW;

                /* Make sure the new status is written */
                wmb();

                err = mlx4_SYNC_TPT(dev);
        } else {
                int key = key_to_hw_index(mmr->key) & (dev->caps.num_mpts - 1);

                struct mlx4_cmd_mailbox *mailbox =
                        container_of((void *)mpt_entry, struct mlx4_cmd_mailbox,
                                     buf);

                (*mpt_entry)->lkey = 0;
                err = mlx4_SW2HW_MPT(dev, mailbox, key);
        }

        if (!err) {
                mmr->pd = be32_to_cpu((*mpt_entry)->pd_flags) & MLX4_MPT_PD_MASK;
                mmr->enabled = MLX4_MPT_EN_HW;
        }
        return err;
}
EXPORT_SYMBOL_GPL(mlx4_mr_hw_write_mpt);

void mlx4_mr_hw_put_mpt(struct mlx4_dev *dev,
                        struct mlx4_mpt_entry **mpt_entry)
{
        if (mlx4_is_mfunc(dev)) {
                struct mlx4_cmd_mailbox *mailbox =
                        container_of((void *)mpt_entry, struct mlx4_cmd_mailbox,
                                     buf);
                mlx4_free_cmd_mailbox(dev, mailbox);
        }
}
EXPORT_SYMBOL_GPL(mlx4_mr_hw_put_mpt);

int mlx4_mr_hw_change_pd(struct mlx4_dev *dev, struct mlx4_mpt_entry *mpt_entry,
                         u32 pdn)
{
        u32 pd_flags = be32_to_cpu(mpt_entry->pd_flags) & ~MLX4_MPT_PD_MASK;
        /* The wrapper function will put the slave's id here */
        if (mlx4_is_mfunc(dev))
                pd_flags &= ~MLX4_MPT_PD_VF_MASK;

        mpt_entry->pd_flags = cpu_to_be32(pd_flags |
                                          (pdn & MLX4_MPT_PD_MASK)
                                          | MLX4_MPT_PD_FLAG_EN_INV);
        return 0;
}
EXPORT_SYMBOL_GPL(mlx4_mr_hw_change_pd);

int mlx4_mr_hw_change_access(struct mlx4_dev *dev,
                             struct mlx4_mpt_entry *mpt_entry,
                             u32 access)
{
        u32 flags = (be32_to_cpu(mpt_entry->flags) & ~MLX4_PERM_MASK) |
                    (access & MLX4_PERM_MASK);

        mpt_entry->flags = cpu_to_be32(flags);
        return 0;
}
EXPORT_SYMBOL_GPL(mlx4_mr_hw_change_access);

static int mlx4_mr_alloc_reserved(struct mlx4_dev *dev, u32 mridx, u32 pd,
                           u64 iova, u64 size, u32 access, int npages,
                           int page_shift, struct mlx4_mr *mr)
{
        mr->iova       = iova;
        mr->size       = size;
        mr->pd         = pd;
        mr->access     = access;
        mr->enabled    = MLX4_MPT_DISABLED;
        mr->key        = hw_index_to_key(mridx);

        return mlx4_mtt_init(dev, npages, page_shift, &mr->mtt);
}

static int mlx4_WRITE_MTT(struct mlx4_dev *dev,
                          struct mlx4_cmd_mailbox *mailbox,
                          int num_entries)
{
        return mlx4_cmd(dev, mailbox->dma, num_entries, 0, MLX4_CMD_WRITE_MTT,
                        MLX4_CMD_TIME_CLASS_A,  MLX4_CMD_WRAPPED);
}

int __mlx4_mpt_reserve(struct mlx4_dev *dev)
{
        struct mlx4_priv *priv = mlx4_priv(dev);

        return mlx4_bitmap_alloc(&priv->mr_table.mpt_bitmap);
}

static int mlx4_mpt_reserve(struct mlx4_dev *dev)
{
        u64 out_param;

        if (mlx4_is_mfunc(dev)) {
                if (mlx4_cmd_imm(dev, 0, &out_param, RES_MPT, RES_OP_RESERVE,
                                   MLX4_CMD_ALLOC_RES,
                                   MLX4_CMD_TIME_CLASS_A, MLX4_CMD_WRAPPED))
                        return -1;
                return get_param_l(&out_param);
        }
        return  __mlx4_mpt_reserve(dev);
}

void __mlx4_mpt_release(struct mlx4_dev *dev, u32 index)
{
        struct mlx4_priv *priv = mlx4_priv(dev);

        mlx4_bitmap_free(&priv->mr_table.mpt_bitmap, index, MLX4_NO_RR);
}

static void mlx4_mpt_release(struct mlx4_dev *dev, u32 index)
{
        u64 in_param = 0;

        if (mlx4_is_mfunc(dev)) {
                set_param_l(&in_param, index);
                if (mlx4_cmd(dev, in_param, RES_MPT, RES_OP_RESERVE,
                               MLX4_CMD_FREE_RES,
                               MLX4_CMD_TIME_CLASS_A, MLX4_CMD_WRAPPED))
                        mlx4_warn(dev, "Failed to release mr index:%d\n",
                                  index);
                return;
        }
        __mlx4_mpt_release(dev, index);
}

int __mlx4_mpt_alloc_icm(struct mlx4_dev *dev, u32 index)
{
        struct mlx4_mr_table *mr_table = &mlx4_priv(dev)->mr_table;

        return mlx4_table_get(dev, &mr_table->dmpt_table, index);
}

static int mlx4_mpt_alloc_icm(struct mlx4_dev *dev, u32 index)
{
        u64 param = 0;

        if (mlx4_is_mfunc(dev)) {
                set_param_l(&param, index);
                return mlx4_cmd_imm(dev, param, &param, RES_MPT, RES_OP_MAP_ICM,
                                                        MLX4_CMD_ALLOC_RES,
                                                        MLX4_CMD_TIME_CLASS_A,
                                                        MLX4_CMD_WRAPPED);
        }
        return __mlx4_mpt_alloc_icm(dev, index);
}

void __mlx4_mpt_free_icm(struct mlx4_dev *dev, u32 index)
{
        struct mlx4_mr_table *mr_table = &mlx4_priv(dev)->mr_table;

        mlx4_table_put(dev, &mr_table->dmpt_table, index);
}

static void mlx4_mpt_free_icm(struct mlx4_dev *dev, u32 index)
{
        u64 in_param = 0;

        if (mlx4_is_mfunc(dev)) {
                set_param_l(&in_param, index);
                if (mlx4_cmd(dev, in_param, RES_MPT, RES_OP_MAP_ICM,
                             MLX4_CMD_FREE_RES, MLX4_CMD_TIME_CLASS_A,
                             MLX4_CMD_WRAPPED))
                        mlx4_warn(dev, "Failed to free icm of mr index:%d\n",
                                  index);
                return;
        }
        return __mlx4_mpt_free_icm(dev, index);
}

int mlx4_mr_alloc(struct mlx4_dev *dev, u32 pd, u64 iova, u64 size, u32 access,
                  int npages, int page_shift, struct mlx4_mr *mr)
{
        u32 index;
        int err;

        index = mlx4_mpt_reserve(dev);
        if (index == -1)
                return -ENOMEM;

        err = mlx4_mr_alloc_reserved(dev, index, pd, iova, size,
                                     access, npages, page_shift, mr);
        if (err)
                mlx4_mpt_release(dev, index);

        return err;
}
EXPORT_SYMBOL_GPL(mlx4_mr_alloc);

static int mlx4_mr_free_reserved(struct mlx4_dev *dev, struct mlx4_mr *mr)
{
        int err;

        if (mr->enabled == MLX4_MPT_EN_HW) {
                err = mlx4_HW2SW_MPT(dev, NULL,
                                     key_to_hw_index(mr->key) &
                                     (dev->caps.num_mpts - 1));
                if (err) {
                        mlx4_warn(dev, "HW2SW_MPT failed (%d), MR has MWs bound to it\n",
                                  err);
                        return err;
                }

                mr->enabled = MLX4_MPT_EN_SW;
        }
        mlx4_mtt_cleanup(dev, &mr->mtt);

        return 0;
}

int mlx4_mr_free(struct mlx4_dev *dev, struct mlx4_mr *mr)
{
        int ret;

        ret = mlx4_mr_free_reserved(dev, mr);
        if (ret)
                return ret;
        if (mr->enabled)
                mlx4_mpt_free_icm(dev, key_to_hw_index(mr->key));
        mlx4_mpt_release(dev, key_to_hw_index(mr->key));

        return 0;
}
EXPORT_SYMBOL_GPL(mlx4_mr_free);

void mlx4_mr_rereg_mem_cleanup(struct mlx4_dev *dev, struct mlx4_mr *mr)
{
        mlx4_mtt_cleanup(dev, &mr->mtt);
        mr->mtt.order = -1;
}
EXPORT_SYMBOL_GPL(mlx4_mr_rereg_mem_cleanup);

int mlx4_mr_rereg_mem_write(struct mlx4_dev *dev, struct mlx4_mr *mr,
                            u64 iova, u64 size, int npages,
                            int page_shift, struct mlx4_mpt_entry *mpt_entry)
{
        int err;

        err = mlx4_mtt_init(dev, npages, page_shift, &mr->mtt);
        if (err)
                return err;

        mpt_entry->start       = cpu_to_be64(iova);
        mpt_entry->length      = cpu_to_be64(size);
        mpt_entry->entity_size = cpu_to_be32(page_shift);
        mpt_entry->flags    &= ~(cpu_to_be32(MLX4_MPT_FLAG_FREE |
                                           MLX4_MPT_FLAG_SW_OWNS));
        if (mr->mtt.order < 0) {
                mpt_entry->flags |= cpu_to_be32(MLX4_MPT_FLAG_PHYSICAL);
                mpt_entry->mtt_addr = 0;
        } else {
                mpt_entry->mtt_addr = cpu_to_be64(mlx4_mtt_addr(dev,
                                                  &mr->mtt));
                if (mr->mtt.page_shift == 0)
                        mpt_entry->mtt_sz    = cpu_to_be32(1 << mr->mtt.order);
        }
        if (mr->mtt.order >= 0 && mr->mtt.page_shift == 0) {
                /* fast register MR in free state */
                mpt_entry->flags    |= cpu_to_be32(MLX4_MPT_FLAG_FREE);
                mpt_entry->pd_flags |= cpu_to_be32(MLX4_MPT_PD_FLAG_FAST_REG |
                                                   MLX4_MPT_PD_FLAG_RAE);
        } else {
                mpt_entry->flags    |= cpu_to_be32(MLX4_MPT_FLAG_SW_OWNS);
        }
        mr->enabled = MLX4_MPT_EN_SW;

        return 0;
}
EXPORT_SYMBOL_GPL(mlx4_mr_rereg_mem_write);

int mlx4_mr_enable(struct mlx4_dev *dev, struct mlx4_mr *mr)
{
        struct mlx4_cmd_mailbox *mailbox;
        struct mlx4_mpt_entry *mpt_entry;
        int err;

        err = mlx4_mpt_alloc_icm(dev, key_to_hw_index(mr->key));
        if (err)
                return err;

        mailbox = mlx4_alloc_cmd_mailbox(dev);
        if (IS_ERR(mailbox)) {
                err = PTR_ERR(mailbox);
                goto err_table;
        }
        mpt_entry = mailbox->buf;
        mpt_entry->flags = cpu_to_be32(MLX4_MPT_FLAG_MIO         |
                                       MLX4_MPT_FLAG_REGION      |
                                       mr->access);

        mpt_entry->key         = cpu_to_be32(key_to_hw_index(mr->key));
        mpt_entry->pd_flags    = cpu_to_be32(mr->pd | MLX4_MPT_PD_FLAG_EN_INV);
        mpt_entry->start       = cpu_to_be64(mr->iova);
        mpt_entry->length      = cpu_to_be64(mr->size);
        mpt_entry->entity_size = cpu_to_be32(mr->mtt.page_shift);

        if (mr->mtt.order < 0) {
                mpt_entry->flags |= cpu_to_be32(MLX4_MPT_FLAG_PHYSICAL);
                mpt_entry->mtt_addr = 0;
        } else {
                mpt_entry->mtt_addr = cpu_to_be64(mlx4_mtt_addr(dev,
                                                  &mr->mtt));
        }

        if (mr->mtt.order >= 0 && mr->mtt.page_shift == 0) {
                /* fast register MR in free state */
                mpt_entry->flags    |= cpu_to_be32(MLX4_MPT_FLAG_FREE);
                mpt_entry->pd_flags |= cpu_to_be32(MLX4_MPT_PD_FLAG_FAST_REG |
                                                   MLX4_MPT_PD_FLAG_RAE);
                mpt_entry->mtt_sz    = cpu_to_be32(1 << mr->mtt.order);
        } else {
                mpt_entry->flags    |= cpu_to_be32(MLX4_MPT_FLAG_SW_OWNS);
        }

        err = mlx4_SW2HW_MPT(dev, mailbox,
                             key_to_hw_index(mr->key) & (dev->caps.num_mpts - 1));
        if (err) {
                mlx4_warn(dev, "SW2HW_MPT failed (%d)\n", err);
                goto err_cmd;
        }
        mr->enabled = MLX4_MPT_EN_HW;

        mlx4_free_cmd_mailbox(dev, mailbox);

        return 0;

err_cmd:
        mlx4_free_cmd_mailbox(dev, mailbox);

err_table:
        mlx4_mpt_free_icm(dev, key_to_hw_index(mr->key));
        return err;
}
EXPORT_SYMBOL_GPL(mlx4_mr_enable);

static int mlx4_write_mtt_chunk(struct mlx4_dev *dev, struct mlx4_mtt *mtt,
                                int start_index, int npages, u64 *page_list)
{
        struct mlx4_priv *priv = mlx4_priv(dev);
        __be64 *mtts;
        dma_addr_t dma_handle;
        int i;

        mtts = mlx4_table_find(&priv->mr_table.mtt_table, mtt->offset +
                               start_index, &dma_handle);

        if (!mtts)
                return -ENOMEM;

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

        for (i = 0; i < npages; ++i)
                mtts[i] = cpu_to_be64(page_list[i] | MLX4_MTT_FLAG_PRESENT);

        dma_sync_single_for_device(&dev->persist->pdev->dev, dma_handle,
                                   npages * sizeof(u64), DMA_TO_DEVICE);

        return 0;
}

int __mlx4_write_mtt(struct mlx4_dev *dev, struct mlx4_mtt *mtt,
                     int start_index, int npages, u64 *page_list)
{
        int err = 0;
        int chunk;
        int mtts_per_page;
        int max_mtts_first_page;

        /* compute how may mtts fit in the first page */
        mtts_per_page = PAGE_SIZE / sizeof(u64);
        max_mtts_first_page = mtts_per_page - (mtt->offset + start_index)
                              % mtts_per_page;

        chunk = min_t(int, max_mtts_first_page, npages);

        while (npages > 0) {
                err = mlx4_write_mtt_chunk(dev, mtt, start_index, chunk, page_list);
                if (err)
                        return err;
                npages      -= chunk;
                start_index += chunk;
                page_list   += chunk;

                chunk = min_t(int, mtts_per_page, npages);
        }
        return err;
}

int mlx4_write_mtt(struct mlx4_dev *dev, struct mlx4_mtt *mtt,
                   int start_index, int npages, u64 *page_list)
{
        struct mlx4_cmd_mailbox *mailbox = NULL;
        __be64 *inbox = NULL;
        int chunk;
        int err = 0;
        int i;

        if (mtt->order < 0)
                return -EINVAL;

        if (mlx4_is_mfunc(dev)) {
                mailbox = mlx4_alloc_cmd_mailbox(dev);
                if (IS_ERR(mailbox))
                        return PTR_ERR(mailbox);
                inbox = mailbox->buf;

                while (npages > 0) {
                        chunk = min_t(int, MLX4_MAILBOX_SIZE / sizeof(u64) - 2,
                                      npages);
                        inbox[0] = cpu_to_be64(mtt->offset + start_index);
                        inbox[1] = 0;
                        for (i = 0; i < chunk; ++i)
                                inbox[i + 2] = cpu_to_be64(page_list[i] |
                                               MLX4_MTT_FLAG_PRESENT);
                        err = mlx4_WRITE_MTT(dev, mailbox, chunk);
                        if (err) {
                                mlx4_free_cmd_mailbox(dev, mailbox);
                                return err;
                        }

                        npages      -= chunk;
                        start_index += chunk;
                        page_list   += chunk;
                }
                mlx4_free_cmd_mailbox(dev, mailbox);
                return err;
        }

        return __mlx4_write_mtt(dev, mtt, start_index, npages, page_list);
}
EXPORT_SYMBOL_GPL(mlx4_write_mtt);

int mlx4_buf_write_mtt(struct mlx4_dev *dev, struct mlx4_mtt *mtt,
                       struct mlx4_buf *buf)
{
        u64 *page_list;
        int err;
        int i;

        page_list = kcalloc(buf->npages, sizeof(*page_list), GFP_KERNEL);
        if (!page_list)
                return -ENOMEM;

        for (i = 0; i < buf->npages; ++i)
                if (buf->nbufs == 1)
                        page_list[i] = buf->direct.map + (i << buf->page_shift);
                else
                        page_list[i] = buf->page_list[i].map;

        err = mlx4_write_mtt(dev, mtt, 0, buf->npages, page_list);

        kfree(page_list);
        return err;
}
EXPORT_SYMBOL_GPL(mlx4_buf_write_mtt);

int mlx4_mw_alloc(struct mlx4_dev *dev, u32 pd, enum mlx4_mw_type type,
                  struct mlx4_mw *mw)
{
        u32 index;

        if ((type == MLX4_MW_TYPE_1 &&
             !(dev->caps.flags & MLX4_DEV_CAP_FLAG_MEM_WINDOW)) ||
             (type == MLX4_MW_TYPE_2 &&
             !(dev->caps.bmme_flags & MLX4_BMME_FLAG_TYPE_2_WIN)))
                return -EOPNOTSUPP;

        index = mlx4_mpt_reserve(dev);
        if (index == -1)
                return -ENOMEM;

        mw->key     = hw_index_to_key(index);
        mw->pd      = pd;
        mw->type    = type;
        mw->enabled = MLX4_MPT_DISABLED;

        return 0;
}
EXPORT_SYMBOL_GPL(mlx4_mw_alloc);

int mlx4_mw_enable(struct mlx4_dev *dev, struct mlx4_mw *mw)
{
        struct mlx4_cmd_mailbox *mailbox;
        struct mlx4_mpt_entry *mpt_entry;
        int err;

        err = mlx4_mpt_alloc_icm(dev, key_to_hw_index(mw->key));
        if (err)
                return err;

        mailbox = mlx4_alloc_cmd_mailbox(dev);
        if (IS_ERR(mailbox)) {
                err = PTR_ERR(mailbox);
                goto err_table;
        }
        mpt_entry = mailbox->buf;

        /* Note that the MLX4_MPT_FLAG_REGION bit in mpt_entry->flags is turned
         * off, thus creating a memory window and not a memory region.
         */
        mpt_entry->key         = cpu_to_be32(key_to_hw_index(mw->key));
        mpt_entry->pd_flags    = cpu_to_be32(mw->pd);
        if (mw->type == MLX4_MW_TYPE_2) {
                mpt_entry->flags    |= cpu_to_be32(MLX4_MPT_FLAG_FREE);
                mpt_entry->qpn       = cpu_to_be32(MLX4_MPT_QP_FLAG_BOUND_QP);
                mpt_entry->pd_flags |= cpu_to_be32(MLX4_MPT_PD_FLAG_EN_INV);
        }

        err = mlx4_SW2HW_MPT(dev, mailbox,
                             key_to_hw_index(mw->key) &
                             (dev->caps.num_mpts - 1));
        if (err) {
                mlx4_warn(dev, "SW2HW_MPT failed (%d)\n", err);
                goto err_cmd;
        }
        mw->enabled = MLX4_MPT_EN_HW;

        mlx4_free_cmd_mailbox(dev, mailbox);

        return 0;

err_cmd:
        mlx4_free_cmd_mailbox(dev, mailbox);

err_table:
        mlx4_mpt_free_icm(dev, key_to_hw_index(mw->key));
        return err;
}
EXPORT_SYMBOL_GPL(mlx4_mw_enable);

void mlx4_mw_free(struct mlx4_dev *dev, struct mlx4_mw *mw)
{
        int err;

        if (mw->enabled == MLX4_MPT_EN_HW) {
                err = mlx4_HW2SW_MPT(dev, NULL,
                                     key_to_hw_index(mw->key) &
                                     (dev->caps.num_mpts - 1));
                if (err)
                        mlx4_warn(dev, "xxx HW2SW_MPT failed (%d)\n", err);

                mw->enabled = MLX4_MPT_EN_SW;
        }
        if (mw->enabled)
                mlx4_mpt_free_icm(dev, key_to_hw_index(mw->key));
        mlx4_mpt_release(dev, key_to_hw_index(mw->key));
}
EXPORT_SYMBOL_GPL(mlx4_mw_free);

int mlx4_init_mr_table(struct mlx4_dev *dev)
{
        struct mlx4_priv *priv = mlx4_priv(dev);
        struct mlx4_mr_table *mr_table = &priv->mr_table;
        int err;

        /* Nothing to do for slaves - all MR handling is forwarded
        * to the master */
        if (mlx4_is_slave(dev))
                return 0;

        if (!is_power_of_2(dev->caps.num_mpts))
                return -EINVAL;

        err = mlx4_bitmap_init(&mr_table->mpt_bitmap, dev->caps.num_mpts,
                               ~0, dev->caps.reserved_mrws, 0);
        if (err)
                return err;

        err = mlx4_buddy_init(&mr_table->mtt_buddy,
                              ilog2((u32)dev->caps.num_mtts /
                              (1 << log_mtts_per_seg)));
        if (err)
                goto err_buddy;

        if (dev->caps.reserved_mtts) {
                priv->reserved_mtts =
                        mlx4_alloc_mtt_range(dev,
                                             fls(dev->caps.reserved_mtts - 1));
                if (priv->reserved_mtts < 0) {
                        mlx4_warn(dev, "MTT table of order %u is too small\n",
                                  mr_table->mtt_buddy.max_order);
                        err = -ENOMEM;
                        goto err_reserve_mtts;
                }
        }

        return 0;

err_reserve_mtts:
        mlx4_buddy_cleanup(&mr_table->mtt_buddy);

err_buddy:
        mlx4_bitmap_cleanup(&mr_table->mpt_bitmap);

        return err;
}

void mlx4_cleanup_mr_table(struct mlx4_dev *dev)
{
        struct mlx4_priv *priv = mlx4_priv(dev);
        struct mlx4_mr_table *mr_table = &priv->mr_table;

        if (mlx4_is_slave(dev))
                return;
        if (priv->reserved_mtts >= 0)
                mlx4_free_mtt_range(dev, priv->reserved_mtts,
                                    fls(dev->caps.reserved_mtts - 1));
        mlx4_buddy_cleanup(&mr_table->mtt_buddy);
        mlx4_bitmap_cleanup(&mr_table->mpt_bitmap);
}

int mlx4_SYNC_TPT(struct mlx4_dev *dev)
{
        return mlx4_cmd(dev, 0, 0, 0, MLX4_CMD_SYNC_TPT,
                        MLX4_CMD_TIME_CLASS_A, MLX4_CMD_NATIVE);
}
EXPORT_SYMBOL_GPL(mlx4_SYNC_TPT);