drivers/infiniband/hw/mthca/mthca_mr.c - kernel/msm-4.9 - Gitiles

 /*
  * 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.
  *
  * $Id: mthca_mr.c 1349 2004-12-16 21:09:43Z roland $
  */

 #include <linux/slab.h>
 #include <linux/init.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

 /*
  * 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) {
 		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 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]);
 		seg >>= 1;
 		++order;
 	}

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

 	spin_unlock(&buddy->lock);
 }

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

 	memset(buddy->bits, 0, (buddy->max_order + 1) * sizeof (long *));

 	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 __devexit mthca_buddy_cleanup(struct mthca_buddy *buddy)
 {
 	int i;

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

 	kfree(buddy->bits);
 }

 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 = MTHCA_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);
 }

 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;
 	u8 status;
 	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 * MTHCA_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, &status);
 		if (err) {
 			mthca_warn(dev, "WRITE_MTT failed (%d)\n", err);
 			goto out;
 		}
 		if (status) {
 			mthca_warn(dev, "WRITE_MTT returned status 0x%02x\n",
 				   status);
 			err = -EINVAL;
 			goto out;
 		}

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

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

 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);
 }

 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;
 	u8 status;

 	might_sleep();

 	WARN_ON(buffer_size_shift >= 32);

 	key = mthca_alloc(&dev->mr_table.mpt_alloc);
 	if (key == -1)
 		return -ENOMEM;
 	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 * MTHCA_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),
 			      &status);
 	if (err) {
 		mthca_warn(dev, "SW2HW_MPT failed (%d)\n", err);
 		goto err_out_mailbox;
 	} else if (status) {
 		mthca_warn(dev, "SW2HW_MPT returned status 0x%02x\n",
 			   status);
 		err = -EINVAL;
 		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;
 	u8 status;

 	might_sleep();

 	err = mthca_HW2SW_MPT(dev, NULL,
 			      key_to_hw_index(dev, mr->ibmr.lkey) &
 			      (dev->limits.num_mpts - 1),
 			      &status);
 	if (err)
 		mthca_warn(dev, "HW2SW_MPT failed (%d)\n", err);
 	else if (status)
 		mthca_warn(dev, "HW2SW_MPT returned status 0x%02x\n",
 			   status);

 	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;
 	u8 status;
 	int list_len = mr->attr.max_pages;
 	int err = -ENOMEM;
 	int i;

 	might_sleep();

 	if (mr->attr.page_size < 12 || mr->attr.page_size >= 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;

 	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);
 		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))
 		goto err_out_table;

 	mtt_seg = mr->mtt->first_seg * MTHCA_MTT_SEG_SIZE;

 	if (mthca_is_memfree(dev)) {
 		mr->mem.arbel.mtts = mthca_table_find(dev->mr_table.mtt_table,
 						      mr->mtt->first_seg);
 		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))
 		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_size - 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),
 			      &status);
 	if (err) {
 		mthca_warn(dev, "SW2HW_MPT failed (%d)\n", err);
 		goto err_out_mailbox_free;
 	}
 	if (status) {
 		mthca_warn(dev, "SW2HW_MPT returned status 0x%02x\n",
 			   status);
 		err = -EINVAL;
 		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, mr->ibmr.lkey);
 	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_size) - 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_size));
 	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);
 	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();

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

 	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_size));
 	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)
 {
 	u32 key;

 	if (!fmr->maps)
 		return;

 	key = tavor_key_to_hw_index(fmr->ibmr.lkey);
 	key &= dev->limits.num_mpts - 1;
 	fmr->ibmr.lkey = fmr->ibmr.rkey = tavor_hw_index_to_key(key);

 	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)
 {
 	u32 key;

 	if (!fmr->maps)
 		return;

 	key = arbel_key_to_hw_index(fmr->ibmr.lkey);
 	key &= dev->limits.num_mpts - 1;
 	fmr->ibmr.lkey = fmr->ibmr.rkey = arbel_hw_index_to_key(key);

 	fmr->maps = 0;

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

 int __devinit mthca_init_mr_table(struct mthca_dev *dev)
 {
 	int 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;

 	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;
 		}

 		dev->mr_table.tavor_fmr.mpt_base =
 		       	ioremap(dev->mr_table.mpt_base,
 				(1 << i) * 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;
 		}

 		dev->mr_table.tavor_fmr.mtt_base =
 			ioremap(dev->mr_table.mtt_base,
 				(1 << i) * MTHCA_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;
 		}

 		err = mthca_buddy_init(&dev->mr_table.tavor_fmr.mtt_buddy, i);
 		if (err)
 			goto err_fmr_mtt_buddy;

 		/* Prevent regular MRs from using FMR keys */
 		err = mthca_buddy_alloc(&dev->mr_table.mtt_buddy, i);
 		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 __devexit 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);
 }
	/*
	* 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.
	*
	* $Id: mthca_mr.c 1349 2004-12-16 21:09:43Z roland $
	*/

	#include <linux/slab.h>
	#include <linux/init.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

	/*
	* 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) {
	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 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]);
	seg >>= 1;
	++order;
	}

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

	spin_unlock(&buddy->lock);
	}

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

	memset(buddy->bits, 0, (buddy->max_order + 1) * sizeof (long *));

	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 __devexit mthca_buddy_cleanup(struct mthca_buddy *buddy)
	{
	int i;

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

	kfree(buddy->bits);
	}

	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 = MTHCA_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);
	}

	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;
	u8 status;
	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 * MTHCA_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, &status);
	if (err) {
	mthca_warn(dev, "WRITE_MTT failed (%d)\n", err);
	goto out;
	}
	if (status) {
	mthca_warn(dev, "WRITE_MTT returned status 0x%02x\n",
	status);
	err = -EINVAL;
	goto out;
	}

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

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

	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);
	}

	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;
	u8 status;

	might_sleep();

	WARN_ON(buffer_size_shift >= 32);

	key = mthca_alloc(&dev->mr_table.mpt_alloc);
	if (key == -1)
	return -ENOMEM;
	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 * MTHCA_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),
	&status);
	if (err) {
	mthca_warn(dev, "SW2HW_MPT failed (%d)\n", err);
	goto err_out_mailbox;
	} else if (status) {
	mthca_warn(dev, "SW2HW_MPT returned status 0x%02x\n",
	status);
	err = -EINVAL;
	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;
	u8 status;

	might_sleep();

	err = mthca_HW2SW_MPT(dev, NULL,
	key_to_hw_index(dev, mr->ibmr.lkey) &
	(dev->limits.num_mpts - 1),
	&status);
	if (err)
	mthca_warn(dev, "HW2SW_MPT failed (%d)\n", err);
	else if (status)
	mthca_warn(dev, "HW2SW_MPT returned status 0x%02x\n",
	status);

	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;
	u8 status;
	int list_len = mr->attr.max_pages;
	int err = -ENOMEM;
	int i;

	might_sleep();

	if (mr->attr.page_size < 12 \|\| mr->attr.page_size >= 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;

	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);
	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))
	goto err_out_table;

	mtt_seg = mr->mtt->first_seg * MTHCA_MTT_SEG_SIZE;

	if (mthca_is_memfree(dev)) {
	mr->mem.arbel.mtts = mthca_table_find(dev->mr_table.mtt_table,
	mr->mtt->first_seg);
	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))
	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_size - 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),
	&status);
	if (err) {
	mthca_warn(dev, "SW2HW_MPT failed (%d)\n", err);
	goto err_out_mailbox_free;
	}
	if (status) {
	mthca_warn(dev, "SW2HW_MPT returned status 0x%02x\n",
	status);
	err = -EINVAL;
	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, mr->ibmr.lkey);
	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_size) - 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_size));
	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);
	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();

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

	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_size));
	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)
	{
	u32 key;

	if (!fmr->maps)
	return;

	key = tavor_key_to_hw_index(fmr->ibmr.lkey);
	key &= dev->limits.num_mpts - 1;
	fmr->ibmr.lkey = fmr->ibmr.rkey = tavor_hw_index_to_key(key);

	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)
	{
	u32 key;

	if (!fmr->maps)
	return;

	key = arbel_key_to_hw_index(fmr->ibmr.lkey);
	key &= dev->limits.num_mpts - 1;
	fmr->ibmr.lkey = fmr->ibmr.rkey = arbel_hw_index_to_key(key);

	fmr->maps = 0;

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

	int __devinit mthca_init_mr_table(struct mthca_dev *dev)
	{
	int 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;

	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;
	}

	dev->mr_table.tavor_fmr.mpt_base =
	ioremap(dev->mr_table.mpt_base,
	(1 << i) * 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;
	}

	dev->mr_table.tavor_fmr.mtt_base =
	ioremap(dev->mr_table.mtt_base,
	(1 << i) * MTHCA_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;
	}

	err = mthca_buddy_init(&dev->mr_table.tavor_fmr.mtt_buddy, i);
	if (err)
	goto err_fmr_mtt_buddy;

	/* Prevent regular MRs from using FMR keys */
	err = mthca_buddy_alloc(&dev->mr_table.mtt_buddy, i);
	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 __devexit 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);
	}