drivers/infiniband/hw/ipath/ipath_mr.c - linux/kernel/git/davem/net-next - Git at Google

 /*
  * Copyright (c) 2005, 2006 PathScale, 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 <rdma/ib_pack.h>
 #include <rdma/ib_smi.h>

 #include "ipath_verbs.h"

 /**
  * ipath_get_dma_mr - get a DMA memory region
  * @pd: protection domain for this memory region
  * @acc: access flags
  *
  * Returns the memory region on success, otherwise returns an errno.
  */
 struct ib_mr *ipath_get_dma_mr(struct ib_pd *pd, int acc)
 {
 	struct ipath_mr *mr;
 	struct ib_mr *ret;

 	mr = kzalloc(sizeof *mr, GFP_KERNEL);
 	if (!mr) {
 		ret = ERR_PTR(-ENOMEM);
 		goto bail;
 	}

 	mr->mr.access_flags = acc;
 	ret = &mr->ibmr;

 bail:
 	return ret;
 }

 static struct ipath_mr *alloc_mr(int count,
 				 struct ipath_lkey_table *lk_table)
 {
 	struct ipath_mr *mr;
 	int m, i = 0;

 	/* Allocate struct plus pointers to first level page tables. */
 	m = (count + IPATH_SEGSZ - 1) / IPATH_SEGSZ;
 	mr = kmalloc(sizeof *mr + m * sizeof mr->mr.map[0], GFP_KERNEL);
 	if (!mr)
 		goto done;

 	/* Allocate first level page tables. */
 	for (; i < m; i++) {
 		mr->mr.map[i] = kmalloc(sizeof *mr->mr.map[0], GFP_KERNEL);
 		if (!mr->mr.map[i])
 			goto bail;
 	}
 	mr->mr.mapsz = m;

 	/*
 	 * ib_reg_phys_mr() will initialize mr->ibmr except for
 	 * lkey and rkey.
 	 */
 	if (!ipath_alloc_lkey(lk_table, &mr->mr))
 		goto bail;
 	mr->ibmr.rkey = mr->ibmr.lkey = mr->mr.lkey;

 	goto done;

 bail:
 	while (i) {
 		i--;
 		kfree(mr->mr.map[i]);
 	}
 	kfree(mr);
 	mr = NULL;

 done:
 	return mr;
 }

 /**
  * ipath_reg_phys_mr - register a physical memory region
  * @pd: protection domain for this memory region
  * @buffer_list: pointer to the list of physical buffers to register
  * @num_phys_buf: the number of physical buffers to register
  * @iova_start: the starting address passed over IB which maps to this MR
  *
  * Returns the memory region on success, otherwise returns an errno.
  */
 struct ib_mr *ipath_reg_phys_mr(struct ib_pd *pd,
 				struct ib_phys_buf *buffer_list,
 				int num_phys_buf, int acc, u64 *iova_start)
 {
 	struct ipath_mr *mr;
 	int n, m, i;
 	struct ib_mr *ret;

 	mr = alloc_mr(num_phys_buf, &to_idev(pd->device)->lk_table);
 	if (mr == NULL) {
 		ret = ERR_PTR(-ENOMEM);
 		goto bail;
 	}

 	mr->mr.user_base = *iova_start;
 	mr->mr.iova = *iova_start;
 	mr->mr.length = 0;
 	mr->mr.offset = 0;
 	mr->mr.access_flags = acc;
 	mr->mr.max_segs = num_phys_buf;

 	m = 0;
 	n = 0;
 	for (i = 0; i < num_phys_buf; i++) {
 		mr->mr.map[m]->segs[n].vaddr =
 			phys_to_virt(buffer_list[i].addr);
 		mr->mr.map[m]->segs[n].length = buffer_list[i].size;
 		mr->mr.length += buffer_list[i].size;
 		n++;
 		if (n == IPATH_SEGSZ) {
 			m++;
 			n = 0;
 		}
 	}

 	ret = &mr->ibmr;

 bail:
 	return ret;
 }

 /**
  * ipath_reg_user_mr - register a userspace memory region
  * @pd: protection domain for this memory region
  * @region: the user memory region
  * @mr_access_flags: access flags for this memory region
  * @udata: unused by the InfiniPath driver
  *
  * Returns the memory region on success, otherwise returns an errno.
  */
 struct ib_mr *ipath_reg_user_mr(struct ib_pd *pd, struct ib_umem *region,
 				int mr_access_flags, struct ib_udata *udata)
 {
 	struct ipath_mr *mr;
 	struct ib_umem_chunk *chunk;
 	int n, m, i;
 	struct ib_mr *ret;

 	n = 0;
 	list_for_each_entry(chunk, &region->chunk_list, list)
 		n += chunk->nents;

 	mr = alloc_mr(n, &to_idev(pd->device)->lk_table);
 	if (!mr) {
 		ret = ERR_PTR(-ENOMEM);
 		goto bail;
 	}

 	mr->mr.user_base = region->user_base;
 	mr->mr.iova = region->virt_base;
 	mr->mr.length = region->length;
 	mr->mr.offset = region->offset;
 	mr->mr.access_flags = mr_access_flags;
 	mr->mr.max_segs = n;

 	m = 0;
 	n = 0;
 	list_for_each_entry(chunk, &region->chunk_list, list) {
 		for (i = 0; i < chunk->nmap; i++) {
 			mr->mr.map[m]->segs[n].vaddr =
 				page_address(chunk->page_list[i].page);
 			mr->mr.map[m]->segs[n].length = region->page_size;
 			n++;
 			if (n == IPATH_SEGSZ) {
 				m++;
 				n = 0;
 			}
 		}
 	}
 	ret = &mr->ibmr;

 bail:
 	return ret;
 }

 /**
  * ipath_dereg_mr - unregister and free a memory region
  * @ibmr: the memory region to free
  *
  * Returns 0 on success.
  *
  * Note that this is called to free MRs created by ipath_get_dma_mr()
  * or ipath_reg_user_mr().
  */
 int ipath_dereg_mr(struct ib_mr *ibmr)
 {
 	struct ipath_mr *mr = to_imr(ibmr);
 	int i;

 	ipath_free_lkey(&to_idev(ibmr->device)->lk_table, ibmr->lkey);
 	i = mr->mr.mapsz;
 	while (i) {
 		i--;
 		kfree(mr->mr.map[i]);
 	}
 	kfree(mr);
 	return 0;
 }

 /**
  * ipath_alloc_fmr - allocate a fast memory region
  * @pd: the protection domain for this memory region
  * @mr_access_flags: access flags for this memory region
  * @fmr_attr: fast memory region attributes
  *
  * Returns the memory region on success, otherwise returns an errno.
  */
 struct ib_fmr *ipath_alloc_fmr(struct ib_pd *pd, int mr_access_flags,
 			       struct ib_fmr_attr *fmr_attr)
 {
 	struct ipath_fmr *fmr;
 	int m, i = 0;
 	struct ib_fmr *ret;

 	/* Allocate struct plus pointers to first level page tables. */
 	m = (fmr_attr->max_pages + IPATH_SEGSZ - 1) / IPATH_SEGSZ;
 	fmr = kmalloc(sizeof *fmr + m * sizeof fmr->mr.map[0], GFP_KERNEL);
 	if (!fmr)
 		goto bail;

 	/* Allocate first level page tables. */
 	for (; i < m; i++) {
 		fmr->mr.map[i] = kmalloc(sizeof *fmr->mr.map[0],
 					 GFP_KERNEL);
 		if (!fmr->mr.map[i])
 			goto bail;
 	}
 	fmr->mr.mapsz = m;

 	/*
 	 * ib_alloc_fmr() will initialize fmr->ibfmr except for lkey &
 	 * rkey.
 	 */
 	if (!ipath_alloc_lkey(&to_idev(pd->device)->lk_table, &fmr->mr))
 		goto bail;
 	fmr->ibfmr.rkey = fmr->ibfmr.lkey = fmr->mr.lkey;
 	/*
 	 * Resources are allocated but no valid mapping (RKEY can't be
 	 * used).
 	 */
 	fmr->mr.user_base = 0;
 	fmr->mr.iova = 0;
 	fmr->mr.length = 0;
 	fmr->mr.offset = 0;
 	fmr->mr.access_flags = mr_access_flags;
 	fmr->mr.max_segs = fmr_attr->max_pages;
 	fmr->page_shift = fmr_attr->page_shift;

 	ret = &fmr->ibfmr;
 	goto done;

 bail:
 	while (i)
 		kfree(fmr->mr.map[--i]);
 	kfree(fmr);
 	ret = ERR_PTR(-ENOMEM);

 done:
 	return ret;
 }

 /**
  * ipath_map_phys_fmr - set up a fast memory region
  * @ibmfr: the fast memory region to set up
  * @page_list: the list of pages to associate with the fast memory region
  * @list_len: the number of pages to associate with the fast memory region
  * @iova: the virtual address of the start of the fast memory region
  *
  * This may be called from interrupt context.
  */

 int ipath_map_phys_fmr(struct ib_fmr *ibfmr, u64 * page_list,
 		       int list_len, u64 iova)
 {
 	struct ipath_fmr *fmr = to_ifmr(ibfmr);
 	struct ipath_lkey_table *rkt;
 	unsigned long flags;
 	int m, n, i;
 	u32 ps;
 	int ret;

 	if (list_len > fmr->mr.max_segs) {
 		ret = -EINVAL;
 		goto bail;
 	}
 	rkt = &to_idev(ibfmr->device)->lk_table;
 	spin_lock_irqsave(&rkt->lock, flags);
 	fmr->mr.user_base = iova;
 	fmr->mr.iova = iova;
 	ps = 1 << fmr->page_shift;
 	fmr->mr.length = list_len * ps;
 	m = 0;
 	n = 0;
 	ps = 1 << fmr->page_shift;
 	for (i = 0; i < list_len; i++) {
 		fmr->mr.map[m]->segs[n].vaddr = phys_to_virt(page_list[i]);
 		fmr->mr.map[m]->segs[n].length = ps;
 		if (++n == IPATH_SEGSZ) {
 			m++;
 			n = 0;
 		}
 	}
 	spin_unlock_irqrestore(&rkt->lock, flags);
 	ret = 0;

 bail:
 	return ret;
 }

 /**
  * ipath_unmap_fmr - unmap fast memory regions
  * @fmr_list: the list of fast memory regions to unmap
  *
  * Returns 0 on success.
  */
 int ipath_unmap_fmr(struct list_head *fmr_list)
 {
 	struct ipath_fmr *fmr;
 	struct ipath_lkey_table *rkt;
 	unsigned long flags;

 	list_for_each_entry(fmr, fmr_list, ibfmr.list) {
 		rkt = &to_idev(fmr->ibfmr.device)->lk_table;
 		spin_lock_irqsave(&rkt->lock, flags);
 		fmr->mr.user_base = 0;
 		fmr->mr.iova = 0;
 		fmr->mr.length = 0;
 		spin_unlock_irqrestore(&rkt->lock, flags);
 	}
 	return 0;
 }

 /**
  * ipath_dealloc_fmr - deallocate a fast memory region
  * @ibfmr: the fast memory region to deallocate
  *
  * Returns 0 on success.
  */
 int ipath_dealloc_fmr(struct ib_fmr *ibfmr)
 {
 	struct ipath_fmr *fmr = to_ifmr(ibfmr);
 	int i;

 	ipath_free_lkey(&to_idev(ibfmr->device)->lk_table, ibfmr->lkey);
 	i = fmr->mr.mapsz;
 	while (i)
 		kfree(fmr->mr.map[--i]);
 	kfree(fmr);
 	return 0;
 }
	/*
	* Copyright (c) 2005, 2006 PathScale, 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 <rdma/ib_pack.h>
	#include <rdma/ib_smi.h>

	#include "ipath_verbs.h"

	/**
	* ipath_get_dma_mr - get a DMA memory region
	* @pd: protection domain for this memory region
	* @acc: access flags
	*
	* Returns the memory region on success, otherwise returns an errno.
	*/
	struct ib_mr ipath_get_dma_mr(struct ib_pd pd, int acc)
	{
	struct ipath_mr *mr;
	struct ib_mr *ret;

	mr = kzalloc(sizeof *mr, GFP_KERNEL);
	if (!mr) {
	ret = ERR_PTR(-ENOMEM);
	goto bail;
	}

	mr->mr.access_flags = acc;
	ret = &mr->ibmr;

	bail:
	return ret;
	}

	static struct ipath_mr *alloc_mr(int count,
	struct ipath_lkey_table *lk_table)
	{
	struct ipath_mr *mr;
	int m, i = 0;

	/* Allocate struct plus pointers to first level page tables. */
	m = (count + IPATH_SEGSZ - 1) / IPATH_SEGSZ;
	mr = kmalloc(sizeof mr + m sizeof mr->mr.map[0], GFP_KERNEL);
	if (!mr)
	goto done;

	/* Allocate first level page tables. */
	for (; i < m; i++) {
	mr->mr.map[i] = kmalloc(sizeof *mr->mr.map[0], GFP_KERNEL);
	if (!mr->mr.map[i])
	goto bail;
	}
	mr->mr.mapsz = m;

	/*
	* ib_reg_phys_mr() will initialize mr->ibmr except for
	* lkey and rkey.
	*/
	if (!ipath_alloc_lkey(lk_table, &mr->mr))
	goto bail;
	mr->ibmr.rkey = mr->ibmr.lkey = mr->mr.lkey;

	goto done;

	bail:
	while (i) {
	i--;
	kfree(mr->mr.map[i]);
	}
	kfree(mr);
	mr = NULL;

	done:
	return mr;
	}

	/**
	* ipath_reg_phys_mr - register a physical memory region
	* @pd: protection domain for this memory region
	* @buffer_list: pointer to the list of physical buffers to register
	* @num_phys_buf: the number of physical buffers to register
	* @iova_start: the starting address passed over IB which maps to this MR
	*
	* Returns the memory region on success, otherwise returns an errno.
	*/
	struct ib_mr ipath_reg_phys_mr(struct ib_pd pd,
	struct ib_phys_buf *buffer_list,
	int num_phys_buf, int acc, u64 *iova_start)
	{
	struct ipath_mr *mr;
	int n, m, i;
	struct ib_mr *ret;

	mr = alloc_mr(num_phys_buf, &to_idev(pd->device)->lk_table);
	if (mr == NULL) {
	ret = ERR_PTR(-ENOMEM);
	goto bail;
	}

	mr->mr.user_base = *iova_start;
	mr->mr.iova = *iova_start;
	mr->mr.length = 0;
	mr->mr.offset = 0;
	mr->mr.access_flags = acc;
	mr->mr.max_segs = num_phys_buf;

	m = 0;
	n = 0;
	for (i = 0; i < num_phys_buf; i++) {
	mr->mr.map[m]->segs[n].vaddr =
	phys_to_virt(buffer_list[i].addr);
	mr->mr.map[m]->segs[n].length = buffer_list[i].size;
	mr->mr.length += buffer_list[i].size;
	n++;
	if (n == IPATH_SEGSZ) {
	m++;
	n = 0;
	}
	}

	ret = &mr->ibmr;

	bail:
	return ret;
	}

	/**
	* ipath_reg_user_mr - register a userspace memory region
	* @pd: protection domain for this memory region
	* @region: the user memory region
	* @mr_access_flags: access flags for this memory region
	* @udata: unused by the InfiniPath driver
	*
	* Returns the memory region on success, otherwise returns an errno.
	*/
	struct ib_mr ipath_reg_user_mr(struct ib_pd pd, struct ib_umem *region,
	int mr_access_flags, struct ib_udata *udata)
	{
	struct ipath_mr *mr;
	struct ib_umem_chunk *chunk;
	int n, m, i;
	struct ib_mr *ret;

	n = 0;
	list_for_each_entry(chunk, &region->chunk_list, list)
	n += chunk->nents;

	mr = alloc_mr(n, &to_idev(pd->device)->lk_table);
	if (!mr) {
	ret = ERR_PTR(-ENOMEM);
	goto bail;
	}

	mr->mr.user_base = region->user_base;
	mr->mr.iova = region->virt_base;
	mr->mr.length = region->length;
	mr->mr.offset = region->offset;
	mr->mr.access_flags = mr_access_flags;
	mr->mr.max_segs = n;

	m = 0;
	n = 0;
	list_for_each_entry(chunk, &region->chunk_list, list) {
	for (i = 0; i < chunk->nmap; i++) {
	mr->mr.map[m]->segs[n].vaddr =
	page_address(chunk->page_list[i].page);
	mr->mr.map[m]->segs[n].length = region->page_size;
	n++;
	if (n == IPATH_SEGSZ) {
	m++;
	n = 0;
	}
	}
	}
	ret = &mr->ibmr;

	bail:
	return ret;
	}

	/**
	* ipath_dereg_mr - unregister and free a memory region
	* @ibmr: the memory region to free
	*
	* Returns 0 on success.
	*
	* Note that this is called to free MRs created by ipath_get_dma_mr()
	* or ipath_reg_user_mr().
	*/
	int ipath_dereg_mr(struct ib_mr *ibmr)
	{
	struct ipath_mr *mr = to_imr(ibmr);
	int i;

	ipath_free_lkey(&to_idev(ibmr->device)->lk_table, ibmr->lkey);
	i = mr->mr.mapsz;
	while (i) {
	i--;
	kfree(mr->mr.map[i]);
	}
	kfree(mr);
	return 0;
	}

	/**
	* ipath_alloc_fmr - allocate a fast memory region
	* @pd: the protection domain for this memory region
	* @mr_access_flags: access flags for this memory region
	* @fmr_attr: fast memory region attributes
	*
	* Returns the memory region on success, otherwise returns an errno.
	*/
	struct ib_fmr ipath_alloc_fmr(struct ib_pd pd, int mr_access_flags,
	struct ib_fmr_attr *fmr_attr)
	{
	struct ipath_fmr *fmr;
	int m, i = 0;
	struct ib_fmr *ret;

	/* Allocate struct plus pointers to first level page tables. */
	m = (fmr_attr->max_pages + IPATH_SEGSZ - 1) / IPATH_SEGSZ;
	fmr = kmalloc(sizeof fmr + m sizeof fmr->mr.map[0], GFP_KERNEL);
	if (!fmr)
	goto bail;

	/* Allocate first level page tables. */
	for (; i < m; i++) {
	fmr->mr.map[i] = kmalloc(sizeof *fmr->mr.map[0],
	GFP_KERNEL);
	if (!fmr->mr.map[i])
	goto bail;
	}
	fmr->mr.mapsz = m;

	/*
	* ib_alloc_fmr() will initialize fmr->ibfmr except for lkey &
	* rkey.
	*/
	if (!ipath_alloc_lkey(&to_idev(pd->device)->lk_table, &fmr->mr))
	goto bail;
	fmr->ibfmr.rkey = fmr->ibfmr.lkey = fmr->mr.lkey;
	/*
	* Resources are allocated but no valid mapping (RKEY can't be
	* used).
	*/
	fmr->mr.user_base = 0;
	fmr->mr.iova = 0;
	fmr->mr.length = 0;
	fmr->mr.offset = 0;
	fmr->mr.access_flags = mr_access_flags;
	fmr->mr.max_segs = fmr_attr->max_pages;
	fmr->page_shift = fmr_attr->page_shift;

	ret = &fmr->ibfmr;
	goto done;

	bail:
	while (i)
	kfree(fmr->mr.map[--i]);
	kfree(fmr);
	ret = ERR_PTR(-ENOMEM);

	done:
	return ret;
	}

	/**
	* ipath_map_phys_fmr - set up a fast memory region
	* @ibmfr: the fast memory region to set up
	* @page_list: the list of pages to associate with the fast memory region
	* @list_len: the number of pages to associate with the fast memory region
	* @iova: the virtual address of the start of the fast memory region
	*
	* This may be called from interrupt context.
	*/

	int ipath_map_phys_fmr(struct ib_fmr ibfmr, u64 page_list,
	int list_len, u64 iova)
	{
	struct ipath_fmr *fmr = to_ifmr(ibfmr);
	struct ipath_lkey_table *rkt;
	unsigned long flags;
	int m, n, i;
	u32 ps;
	int ret;

	if (list_len > fmr->mr.max_segs) {
	ret = -EINVAL;
	goto bail;
	}
	rkt = &to_idev(ibfmr->device)->lk_table;
	spin_lock_irqsave(&rkt->lock, flags);
	fmr->mr.user_base = iova;
	fmr->mr.iova = iova;
	ps = 1 << fmr->page_shift;
	fmr->mr.length = list_len * ps;
	m = 0;
	n = 0;
	ps = 1 << fmr->page_shift;
	for (i = 0; i < list_len; i++) {
	fmr->mr.map[m]->segs[n].vaddr = phys_to_virt(page_list[i]);
	fmr->mr.map[m]->segs[n].length = ps;
	if (++n == IPATH_SEGSZ) {
	m++;
	n = 0;
	}
	}
	spin_unlock_irqrestore(&rkt->lock, flags);
	ret = 0;

	bail:
	return ret;
	}

	/**
	* ipath_unmap_fmr - unmap fast memory regions
	* @fmr_list: the list of fast memory regions to unmap
	*
	* Returns 0 on success.
	*/
	int ipath_unmap_fmr(struct list_head *fmr_list)
	{
	struct ipath_fmr *fmr;
	struct ipath_lkey_table *rkt;
	unsigned long flags;

	list_for_each_entry(fmr, fmr_list, ibfmr.list) {
	rkt = &to_idev(fmr->ibfmr.device)->lk_table;
	spin_lock_irqsave(&rkt->lock, flags);
	fmr->mr.user_base = 0;
	fmr->mr.iova = 0;
	fmr->mr.length = 0;
	spin_unlock_irqrestore(&rkt->lock, flags);
	}
	return 0;
	}

	/**
	* ipath_dealloc_fmr - deallocate a fast memory region
	* @ibfmr: the fast memory region to deallocate
	*
	* Returns 0 on success.
	*/
	int ipath_dealloc_fmr(struct ib_fmr *ibfmr)
	{
	struct ipath_fmr *fmr = to_ifmr(ibfmr);
	int i;

	ipath_free_lkey(&to_idev(ibfmr->device)->lk_table, ibfmr->lkey);
	i = fmr->mr.mapsz;
	while (i)
	kfree(fmr->mr.map[--i]);
	kfree(fmr);
	return 0;
	}