drivers/net/mlx4/mr.c - maze/linux - Git at Google

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

 #include <linux/mlx4/cmd.h>

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

 /*
  * Must be packed because mtt_seg is 64 bits but only aligned to 32 bits.
  */
 struct mlx4_mpt_entry {
 	__be32 flags;
 	__be32 qpn;
 	__be32 key;
 	__be32 pd;
 	__be64 start;
 	__be64 length;
 	__be32 lkey;
 	__be32 win_cnt;
 	u8	reserved1[3];
 	u8	mtt_rep;
 	__be64 mtt_seg;
 	__be32 mtt_sz;
 	__be32 entity_size;
 	__be32 first_byte_offset;
 } __attribute__((packed));

 #define MLX4_MPT_FLAG_SW_OWNS	    (0xfUL << 28)
 #define MLX4_MPT_FLAG_MIO	    (1 << 17)
 #define MLX4_MPT_FLAG_BIND_ENABLE   (1 << 15)
 #define MLX4_MPT_FLAG_PHYSICAL	    (1 <<  9)
 #define MLX4_MPT_FLAG_REGION	    (1 <<  8)

 #define MLX4_MTT_FLAG_PRESENT		1

 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) {
 		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]);

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

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

 	spin_unlock(&buddy->lock);
 }

 static int __devinit 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 = kzalloc((buddy->max_order + 1) * sizeof (long *),
 			      GFP_KERNEL);
 	if (!buddy->bits)
 		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]);

 	return 0;

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

 	kfree(buddy->bits);

 err_out:
 	return -ENOMEM;
 }

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

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

 	kfree(buddy->bits);
 }

 static u32 mlx4_alloc_mtt_range(struct mlx4_dev *dev, int order)
 {
 	struct mlx4_mr_table *mr_table = &mlx4_priv(dev)->mr_table;
 	u32 seg;

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

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

 	return seg;
 }

 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 = MLX4_MTT_ENTRY_PER_SEG; i < npages; i <<= 1)
 		++mtt->order;

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

 	return 0;
 }
 EXPORT_SYMBOL_GPL(mlx4_mtt_init);

 void mlx4_mtt_cleanup(struct mlx4_dev *dev, struct mlx4_mtt *mtt)
 {
 	struct mlx4_mr_table *mr_table = &mlx4_priv(dev)->mr_table;

 	if (mtt->order < 0)
 		return;

 	mlx4_buddy_free(&mr_table->mtt_buddy, mtt->first_seg, mtt->order);
 	mlx4_table_put_range(dev, &mr_table->mtt_table, mtt->first_seg,
 			     mtt->first_seg + (1 << mtt->order) - 1);
 }
 EXPORT_SYMBOL_GPL(mlx4_mtt_cleanup);

 u64 mlx4_mtt_addr(struct mlx4_dev *dev, struct mlx4_mtt *mtt)
 {
 	return (u64) mtt->first_seg * 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);
 }

 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);
 }

 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)
 {
 	struct mlx4_priv *priv = mlx4_priv(dev);
 	u32 index;
 	int err;

 	index = mlx4_bitmap_alloc(&priv->mr_table.mpt_bitmap);
 	if (index == -1) {
 		err = -ENOMEM;
 		goto err;
 	}

 	mr->iova       = iova;
 	mr->size       = size;
 	mr->pd	       = pd;
 	mr->access     = access;
 	mr->enabled    = 0;
 	mr->key	       = hw_index_to_key(index);

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

 	return 0;

 err_index:
 	mlx4_bitmap_free(&priv->mr_table.mpt_bitmap, index);

 err:
 	kfree(mr);
 	return err;
 }
 EXPORT_SYMBOL_GPL(mlx4_mr_alloc);

 void mlx4_mr_free(struct mlx4_dev *dev, struct mlx4_mr *mr)
 {
 	struct mlx4_priv *priv = mlx4_priv(dev);
 	int err;

 	if (mr->enabled) {
 		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)\n", err);
 	}

 	mlx4_mtt_cleanup(dev, &mr->mtt);
 	mlx4_bitmap_free(&priv->mr_table.mpt_bitmap, key_to_hw_index(mr->key));
 }
 EXPORT_SYMBOL_GPL(mlx4_mr_free);

 int mlx4_mr_enable(struct mlx4_dev *dev, struct mlx4_mr *mr)
 {
 	struct mlx4_mr_table *mr_table = &mlx4_priv(dev)->mr_table;
 	struct mlx4_cmd_mailbox *mailbox;
 	struct mlx4_mpt_entry *mpt_entry;
 	int err;

 	err = mlx4_table_get(dev, &mr_table->dmpt_table, 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;

 	memset(mpt_entry, 0, sizeof *mpt_entry);

 	mpt_entry->flags = cpu_to_be32(MLX4_MPT_FLAG_SW_OWNS	 |
 				       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	       = cpu_to_be32(mr->pd);
 	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_seg = 0;
 	} else
 		mpt_entry->mtt_seg = cpu_to_be64(mlx4_mtt_addr(dev, &mr->mtt));

 	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 = 1;

 	mlx4_free_cmd_mailbox(dev, mailbox);

 	return 0;

 err_cmd:
 	mlx4_free_cmd_mailbox(dev, mailbox);

 err_table:
 	mlx4_table_put(dev, &mr_table->dmpt_table, key_to_hw_index(mr->key));
 	return err;
 }
 EXPORT_SYMBOL_GPL(mlx4_mr_enable);

 static int mlx4_WRITE_MTT(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox,
 			  int num_mtt)
 {
 	return mlx4_cmd(dev, mailbox->dma, num_mtt, 0, MLX4_CMD_WRITE_MTT,
 			MLX4_CMD_TIME_CLASS_B);
 }

 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;
 	__be64 *mtt_entry;
 	int i;
 	int err = 0;

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

 	mailbox = mlx4_alloc_cmd_mailbox(dev);
 	if (IS_ERR(mailbox))
 		return PTR_ERR(mailbox);

 	mtt_entry = mailbox->buf;

 	while (npages > 0) {
 		mtt_entry[0] = cpu_to_be64(mlx4_mtt_addr(dev, mtt) + start_index * 8);
 		mtt_entry[1] = 0;

 		for (i = 0; i < npages && i < MLX4_MAILBOX_SIZE / 8 - 2; ++i)
 			mtt_entry[i + 2] = cpu_to_be64(page_list[i] |
 						       MLX4_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 = mlx4_WRITE_MTT(dev, mailbox, (i + 1) & ~1);
 		if (err)
 			goto out;

 		npages      -= i;
 		start_index += i;
 		page_list   += i;
 	}

 out:
 	mlx4_free_cmd_mailbox(dev, mailbox);

 	return err;
 }
 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 = kmalloc(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->u.direct.map + (i << buf->page_shift);
 		else
 			page_list[i] = buf->u.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 __devinit mlx4_init_mr_table(struct mlx4_dev *dev)
 {
 	struct mlx4_mr_table *mr_table = &mlx4_priv(dev)->mr_table;
 	int err;

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

 	err = mlx4_buddy_init(&mr_table->mtt_buddy,
 			      ilog2(dev->caps.num_mtt_segs));
 	if (err)
 		goto err_buddy;

 	if (dev->caps.reserved_mtts) {
 		if (mlx4_alloc_mtt_range(dev, ilog2(dev->caps.reserved_mtts)) == -1) {
 			mlx4_warn(dev, "MTT table of order %d 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_mr_table *mr_table = &mlx4_priv(dev)->mr_table;

 	mlx4_buddy_cleanup(&mr_table->mtt_buddy);
 	mlx4_bitmap_cleanup(&mr_table->mpt_bitmap);
 }
	/*
	* Copyright (c) 2004 Topspin Communications. All rights reserved.
	* Copyright (c) 2005 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/init.h>
	#include <linux/errno.h>

	#include <linux/mlx4/cmd.h>

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

	/*
	* Must be packed because mtt_seg is 64 bits but only aligned to 32 bits.
	*/
	struct mlx4_mpt_entry {
	__be32 flags;
	__be32 qpn;
	__be32 key;
	__be32 pd;
	__be64 start;
	__be64 length;
	__be32 lkey;
	__be32 win_cnt;
	u8 reserved1[3];
	u8 mtt_rep;
	__be64 mtt_seg;
	__be32 mtt_sz;
	__be32 entity_size;
	__be32 first_byte_offset;
	} __attribute__((packed));

	#define MLX4_MPT_FLAG_SW_OWNS (0xfUL << 28)
	#define MLX4_MPT_FLAG_MIO (1 << 17)
	#define MLX4_MPT_FLAG_BIND_ENABLE (1 << 15)
	#define MLX4_MPT_FLAG_PHYSICAL (1 << 9)
	#define MLX4_MPT_FLAG_REGION (1 << 8)

	#define MLX4_MTT_FLAG_PRESENT 1

	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) {
	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]);

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

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

	spin_unlock(&buddy->lock);
	}

	static int __devinit 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 = kzalloc((buddy->max_order + 1) * sizeof (long *),
	GFP_KERNEL);
	if (!buddy->bits)
	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]);

	return 0;

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

	kfree(buddy->bits);

	err_out:
	return -ENOMEM;
	}

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

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

	kfree(buddy->bits);
	}

	static u32 mlx4_alloc_mtt_range(struct mlx4_dev *dev, int order)
	{
	struct mlx4_mr_table *mr_table = &mlx4_priv(dev)->mr_table;
	u32 seg;

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

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

	return seg;
	}

	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 = MLX4_MTT_ENTRY_PER_SEG; i < npages; i <<= 1)
	++mtt->order;

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

	return 0;
	}
	EXPORT_SYMBOL_GPL(mlx4_mtt_init);

	void mlx4_mtt_cleanup(struct mlx4_dev dev, struct mlx4_mtt mtt)
	{
	struct mlx4_mr_table *mr_table = &mlx4_priv(dev)->mr_table;

	if (mtt->order < 0)
	return;

	mlx4_buddy_free(&mr_table->mtt_buddy, mtt->first_seg, mtt->order);
	mlx4_table_put_range(dev, &mr_table->mtt_table, mtt->first_seg,
	mtt->first_seg + (1 << mtt->order) - 1);
	}
	EXPORT_SYMBOL_GPL(mlx4_mtt_cleanup);

	u64 mlx4_mtt_addr(struct mlx4_dev dev, struct mlx4_mtt mtt)
	{
	return (u64) mtt->first_seg * 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);
	}

	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);
	}

	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)
	{
	struct mlx4_priv *priv = mlx4_priv(dev);
	u32 index;
	int err;

	index = mlx4_bitmap_alloc(&priv->mr_table.mpt_bitmap);
	if (index == -1) {
	err = -ENOMEM;
	goto err;
	}

	mr->iova = iova;
	mr->size = size;
	mr->pd = pd;
	mr->access = access;
	mr->enabled = 0;
	mr->key = hw_index_to_key(index);

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

	return 0;

	err_index:
	mlx4_bitmap_free(&priv->mr_table.mpt_bitmap, index);

	err:
	kfree(mr);
	return err;
	}
	EXPORT_SYMBOL_GPL(mlx4_mr_alloc);

	void mlx4_mr_free(struct mlx4_dev dev, struct mlx4_mr mr)
	{
	struct mlx4_priv *priv = mlx4_priv(dev);
	int err;

	if (mr->enabled) {
	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)\n", err);
	}

	mlx4_mtt_cleanup(dev, &mr->mtt);
	mlx4_bitmap_free(&priv->mr_table.mpt_bitmap, key_to_hw_index(mr->key));
	}
	EXPORT_SYMBOL_GPL(mlx4_mr_free);

	int mlx4_mr_enable(struct mlx4_dev dev, struct mlx4_mr mr)
	{
	struct mlx4_mr_table *mr_table = &mlx4_priv(dev)->mr_table;
	struct mlx4_cmd_mailbox *mailbox;
	struct mlx4_mpt_entry *mpt_entry;
	int err;

	err = mlx4_table_get(dev, &mr_table->dmpt_table, 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;

	memset(mpt_entry, 0, sizeof *mpt_entry);

	mpt_entry->flags = cpu_to_be32(MLX4_MPT_FLAG_SW_OWNS \|
	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 = cpu_to_be32(mr->pd);
	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_seg = 0;
	} else
	mpt_entry->mtt_seg = cpu_to_be64(mlx4_mtt_addr(dev, &mr->mtt));

	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 = 1;

	mlx4_free_cmd_mailbox(dev, mailbox);

	return 0;

	err_cmd:
	mlx4_free_cmd_mailbox(dev, mailbox);

	err_table:
	mlx4_table_put(dev, &mr_table->dmpt_table, key_to_hw_index(mr->key));
	return err;
	}
	EXPORT_SYMBOL_GPL(mlx4_mr_enable);

	static int mlx4_WRITE_MTT(struct mlx4_dev dev, struct mlx4_cmd_mailbox mailbox,
	int num_mtt)
	{
	return mlx4_cmd(dev, mailbox->dma, num_mtt, 0, MLX4_CMD_WRITE_MTT,
	MLX4_CMD_TIME_CLASS_B);
	}

	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;
	__be64 *mtt_entry;
	int i;
	int err = 0;

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

	mailbox = mlx4_alloc_cmd_mailbox(dev);
	if (IS_ERR(mailbox))
	return PTR_ERR(mailbox);

	mtt_entry = mailbox->buf;

	while (npages > 0) {
	mtt_entry[0] = cpu_to_be64(mlx4_mtt_addr(dev, mtt) + start_index * 8);
	mtt_entry[1] = 0;

	for (i = 0; i < npages && i < MLX4_MAILBOX_SIZE / 8 - 2; ++i)
	mtt_entry[i + 2] = cpu_to_be64(page_list[i] \|
	MLX4_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 = mlx4_WRITE_MTT(dev, mailbox, (i + 1) & ~1);
	if (err)
	goto out;

	npages -= i;
	start_index += i;
	page_list += i;
	}

	out:
	mlx4_free_cmd_mailbox(dev, mailbox);

	return err;
	}
	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 = kmalloc(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->u.direct.map + (i << buf->page_shift);
	else
	page_list[i] = buf->u.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 __devinit mlx4_init_mr_table(struct mlx4_dev *dev)
	{
	struct mlx4_mr_table *mr_table = &mlx4_priv(dev)->mr_table;
	int err;

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

	err = mlx4_buddy_init(&mr_table->mtt_buddy,
	ilog2(dev->caps.num_mtt_segs));
	if (err)
	goto err_buddy;

	if (dev->caps.reserved_mtts) {
	if (mlx4_alloc_mtt_range(dev, ilog2(dev->caps.reserved_mtts)) == -1) {
	mlx4_warn(dev, "MTT table of order %d 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_mr_table *mr_table = &mlx4_priv(dev)->mr_table;

	mlx4_buddy_cleanup(&mr_table->mtt_buddy);
	mlx4_bitmap_cleanup(&mr_table->mpt_bitmap);
	}