drivers/infiniband/hw/qib/qib_mr.c - kernel/msm-4.9 - Gitiles

 /*
  * Copyright (c) 2006, 2007, 2008, 2009 QLogic Corporation. All rights reserved.
  * 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_umem.h>
 #include <rdma/ib_smi.h>

 #include "qib.h"

 /* Fast memory region */
 struct qib_fmr {
 	struct ib_fmr ibfmr;
 	struct qib_mregion mr;        /* must be last */
 };

 static inline struct qib_fmr *to_ifmr(struct ib_fmr *ibfmr)
 {
 	return container_of(ibfmr, struct qib_fmr, ibfmr);
 }

 static int init_qib_mregion(struct qib_mregion *mr, struct ib_pd *pd,
 	int count)
 {
 	int m, i = 0;
 	int rval = 0;

 	m = (count + QIB_SEGSZ - 1) / QIB_SEGSZ;
 	for (; i < m; i++) {
 		mr->map[i] = kzalloc(sizeof(*mr->map[0]), GFP_KERNEL);
 		if (!mr->map[i])
 			goto bail;
 	}
 	mr->mapsz = m;
 	init_completion(&mr->comp);
 	/* count returning the ptr to user */
 	atomic_set(&mr->refcount, 1);
 	mr->pd = pd;
 	mr->max_segs = count;
 out:
 	return rval;
 bail:
 	while (i)
 		kfree(mr->map[--i]);
 	rval = -ENOMEM;
 	goto out;
 }

 static void deinit_qib_mregion(struct qib_mregion *mr)
 {
 	int i = mr->mapsz;

 	mr->mapsz = 0;
 	while (i)
 		kfree(mr->map[--i]);
 }


 /**
  * qib_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.
  * Note that all DMA addresses should be created via the
  * struct ib_dma_mapping_ops functions (see qib_dma.c).
  */
 struct ib_mr *qib_get_dma_mr(struct ib_pd *pd, int acc)
 {
 	struct qib_mr *mr = NULL;
 	struct ib_mr *ret;
 	int rval;

 	if (to_ipd(pd)->user) {
 		ret = ERR_PTR(-EPERM);
 		goto bail;
 	}

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

 	rval = init_qib_mregion(&mr->mr, pd, 0);
 	if (rval) {
 		ret = ERR_PTR(rval);
 		goto bail;
 	}


 	rval = qib_alloc_lkey(&mr->mr, 1);
 	if (rval) {
 		ret = ERR_PTR(rval);
 		goto bail_mregion;
 	}

 	mr->mr.access_flags = acc;
 	ret = &mr->ibmr;
 done:
 	return ret;

 bail_mregion:
 	deinit_qib_mregion(&mr->mr);
 bail:
 	kfree(mr);
 	goto done;
 }

 static struct qib_mr *alloc_mr(int count, struct ib_pd *pd)
 {
 	struct qib_mr *mr;
 	int rval = -ENOMEM;
 	int m;

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

 	rval = init_qib_mregion(&mr->mr, pd, count);
 	if (rval)
 		goto bail;

 	rval = qib_alloc_lkey(&mr->mr, 0);
 	if (rval)
 		goto bail_mregion;
 	mr->ibmr.lkey = mr->mr.lkey;
 	mr->ibmr.rkey = mr->mr.lkey;
 done:
 	return mr;

 bail_mregion:
 	deinit_qib_mregion(&mr->mr);
 bail:
 	kfree(mr);
 	mr = ERR_PTR(rval);
 	goto done;
 }

 /**
  * qib_reg_user_mr - register a userspace memory region
  * @pd: protection domain for this memory region
  * @start: starting userspace address
  * @length: length of region to register
  * @mr_access_flags: access flags for this memory region
  * @udata: unused by the QLogic_IB driver
  *
  * Returns the memory region on success, otherwise returns an errno.
  */
 struct ib_mr *qib_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
 			      u64 virt_addr, int mr_access_flags,
 			      struct ib_udata *udata)
 {
 	struct qib_mr *mr;
 	struct ib_umem *umem;
 	struct scatterlist *sg;
 	int n, m, entry;
 	struct ib_mr *ret;

 	if (length == 0) {
 		ret = ERR_PTR(-EINVAL);
 		goto bail;
 	}

 	umem = ib_umem_get(pd->uobject->context, start, length,
 			   mr_access_flags, 0);
 	if (IS_ERR(umem))
 		return (void *) umem;

 	n = umem->nmap;

 	mr = alloc_mr(n, pd);
 	if (IS_ERR(mr)) {
 		ret = (struct ib_mr *)mr;
 		ib_umem_release(umem);
 		goto bail;
 	}

 	mr->mr.user_base = start;
 	mr->mr.iova = virt_addr;
 	mr->mr.length = length;
 	mr->mr.offset = ib_umem_offset(umem);
 	mr->mr.access_flags = mr_access_flags;
 	mr->umem = umem;

 	if (is_power_of_2(umem->page_size))
 		mr->mr.page_shift = ilog2(umem->page_size);
 	m = 0;
 	n = 0;
 	for_each_sg(umem->sg_head.sgl, sg, umem->nmap, entry) {
 			void *vaddr;

 			vaddr = page_address(sg_page(sg));
 			if (!vaddr) {
 				ret = ERR_PTR(-EINVAL);
 				goto bail;
 			}
 			mr->mr.map[m]->segs[n].vaddr = vaddr;
 			mr->mr.map[m]->segs[n].length = umem->page_size;
 			n++;
 			if (n == QIB_SEGSZ) {
 				m++;
 				n = 0;
 			}
 	}
 	ret = &mr->ibmr;

 bail:
 	return ret;
 }

 /**
  * qib_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 qib_get_dma_mr()
  * or qib_reg_user_mr().
  */
 int qib_dereg_mr(struct ib_mr *ibmr)
 {
 	struct qib_mr *mr = to_imr(ibmr);
 	int ret = 0;
 	unsigned long timeout;

 	kfree(mr->pages);
 	qib_free_lkey(&mr->mr);

 	qib_put_mr(&mr->mr); /* will set completion if last */
 	timeout = wait_for_completion_timeout(&mr->mr.comp,
 		5 * HZ);
 	if (!timeout) {
 		qib_get_mr(&mr->mr);
 		ret = -EBUSY;
 		goto out;
 	}
 	deinit_qib_mregion(&mr->mr);
 	if (mr->umem)
 		ib_umem_release(mr->umem);
 	kfree(mr);
 out:
 	return ret;
 }

 /*
  * Allocate a memory region usable with the
  * IB_WR_REG_MR send work request.
  *
  * Return the memory region on success, otherwise return an errno.
  */
 struct ib_mr *qib_alloc_mr(struct ib_pd *pd,
 			   enum ib_mr_type mr_type,
 			   u32 max_num_sg)
 {
 	struct qib_mr *mr;

 	if (mr_type != IB_MR_TYPE_MEM_REG)
 		return ERR_PTR(-EINVAL);

 	mr = alloc_mr(max_num_sg, pd);
 	if (IS_ERR(mr))
 		return (struct ib_mr *)mr;

 	mr->pages = kcalloc(max_num_sg, sizeof(u64), GFP_KERNEL);
 	if (!mr->pages)
 		goto err;

 	return &mr->ibmr;

 err:
 	qib_dereg_mr(&mr->ibmr);
 	return ERR_PTR(-ENOMEM);
 }

 static int qib_set_page(struct ib_mr *ibmr, u64 addr)
 {
 	struct qib_mr *mr = to_imr(ibmr);

 	if (unlikely(mr->npages == mr->mr.max_segs))
 		return -ENOMEM;

 	mr->pages[mr->npages++] = addr;

 	return 0;
 }

 int qib_map_mr_sg(struct ib_mr *ibmr,
 		  struct scatterlist *sg,
 		  int sg_nents)
 {
 	struct qib_mr *mr = to_imr(ibmr);

 	mr->npages = 0;

 	return ib_sg_to_pages(ibmr, sg, sg_nents, qib_set_page);
 }

 /**
  * qib_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 *qib_alloc_fmr(struct ib_pd *pd, int mr_access_flags,
 			     struct ib_fmr_attr *fmr_attr)
 {
 	struct qib_fmr *fmr;
 	int m;
 	struct ib_fmr *ret;
 	int rval = -ENOMEM;

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

 	rval = init_qib_mregion(&fmr->mr, pd, fmr_attr->max_pages);
 	if (rval)
 		goto bail;

 	/*
 	 * ib_alloc_fmr() will initialize fmr->ibfmr except for lkey &
 	 * rkey.
 	 */
 	rval = qib_alloc_lkey(&fmr->mr, 0);
 	if (rval)
 		goto bail_mregion;
 	fmr->ibfmr.rkey = fmr->mr.lkey;
 	fmr->ibfmr.lkey = fmr->mr.lkey;
 	/*
 	 * Resources are allocated but no valid mapping (RKEY can't be
 	 * used).
 	 */
 	fmr->mr.access_flags = mr_access_flags;
 	fmr->mr.max_segs = fmr_attr->max_pages;
 	fmr->mr.page_shift = fmr_attr->page_shift;

 	ret = &fmr->ibfmr;
 done:
 	return ret;

 bail_mregion:
 	deinit_qib_mregion(&fmr->mr);
 bail:
 	kfree(fmr);
 	ret = ERR_PTR(rval);
 	goto done;
 }

 /**
  * qib_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 qib_map_phys_fmr(struct ib_fmr *ibfmr, u64 *page_list,
 		     int list_len, u64 iova)
 {
 	struct qib_fmr *fmr = to_ifmr(ibfmr);
 	struct qib_lkey_table *rkt;
 	unsigned long flags;
 	int m, n, i;
 	u32 ps;
 	int ret;

 	i = atomic_read(&fmr->mr.refcount);
 	if (i > 2)
 		return -EBUSY;

 	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->mr.page_shift;
 	fmr->mr.length = list_len * ps;
 	m = 0;
 	n = 0;
 	for (i = 0; i < list_len; i++) {
 		fmr->mr.map[m]->segs[n].vaddr = (void *) page_list[i];
 		fmr->mr.map[m]->segs[n].length = ps;
 		if (++n == QIB_SEGSZ) {
 			m++;
 			n = 0;
 		}
 	}
 	spin_unlock_irqrestore(&rkt->lock, flags);
 	ret = 0;

 bail:
 	return ret;
 }

 /**
  * qib_unmap_fmr - unmap fast memory regions
  * @fmr_list: the list of fast memory regions to unmap
  *
  * Returns 0 on success.
  */
 int qib_unmap_fmr(struct list_head *fmr_list)
 {
 	struct qib_fmr *fmr;
 	struct qib_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;
 }

 /**
  * qib_dealloc_fmr - deallocate a fast memory region
  * @ibfmr: the fast memory region to deallocate
  *
  * Returns 0 on success.
  */
 int qib_dealloc_fmr(struct ib_fmr *ibfmr)
 {
 	struct qib_fmr *fmr = to_ifmr(ibfmr);
 	int ret = 0;
 	unsigned long timeout;

 	qib_free_lkey(&fmr->mr);
 	qib_put_mr(&fmr->mr); /* will set completion if last */
 	timeout = wait_for_completion_timeout(&fmr->mr.comp,
 		5 * HZ);
 	if (!timeout) {
 		qib_get_mr(&fmr->mr);
 		ret = -EBUSY;
 		goto out;
 	}
 	deinit_qib_mregion(&fmr->mr);
 	kfree(fmr);
 out:
 	return ret;
 }

 void mr_rcu_callback(struct rcu_head *list)
 {
 	struct qib_mregion *mr = container_of(list, struct qib_mregion, list);

 	complete(&mr->comp);
 }
	/*
	* Copyright (c) 2006, 2007, 2008, 2009 QLogic Corporation. All rights reserved.
	* 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_umem.h>
	#include <rdma/ib_smi.h>

	#include "qib.h"

	/* Fast memory region */
	struct qib_fmr {
	struct ib_fmr ibfmr;
	struct qib_mregion mr; /* must be last */
	};

	static inline struct qib_fmr to_ifmr(struct ib_fmr ibfmr)
	{
	return container_of(ibfmr, struct qib_fmr, ibfmr);
	}

	static int init_qib_mregion(struct qib_mregion mr, struct ib_pd pd,
	int count)
	{
	int m, i = 0;
	int rval = 0;

	m = (count + QIB_SEGSZ - 1) / QIB_SEGSZ;
	for (; i < m; i++) {
	mr->map[i] = kzalloc(sizeof(*mr->map[0]), GFP_KERNEL);
	if (!mr->map[i])
	goto bail;
	}
	mr->mapsz = m;
	init_completion(&mr->comp);
	/* count returning the ptr to user */
	atomic_set(&mr->refcount, 1);
	mr->pd = pd;
	mr->max_segs = count;
	out:
	return rval;
	bail:
	while (i)
	kfree(mr->map[--i]);
	rval = -ENOMEM;
	goto out;
	}

	static void deinit_qib_mregion(struct qib_mregion *mr)
	{
	int i = mr->mapsz;

	mr->mapsz = 0;
	while (i)
	kfree(mr->map[--i]);
	}


	/**
	* qib_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.
	* Note that all DMA addresses should be created via the
	* struct ib_dma_mapping_ops functions (see qib_dma.c).
	*/
	struct ib_mr qib_get_dma_mr(struct ib_pd pd, int acc)
	{
	struct qib_mr *mr = NULL;
	struct ib_mr *ret;
	int rval;

	if (to_ipd(pd)->user) {
	ret = ERR_PTR(-EPERM);
	goto bail;
	}

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

	rval = init_qib_mregion(&mr->mr, pd, 0);
	if (rval) {
	ret = ERR_PTR(rval);
	goto bail;
	}


	rval = qib_alloc_lkey(&mr->mr, 1);
	if (rval) {
	ret = ERR_PTR(rval);
	goto bail_mregion;
	}

	mr->mr.access_flags = acc;
	ret = &mr->ibmr;
	done:
	return ret;

	bail_mregion:
	deinit_qib_mregion(&mr->mr);
	bail:
	kfree(mr);
	goto done;
	}

	static struct qib_mr alloc_mr(int count, struct ib_pd pd)
	{
	struct qib_mr *mr;
	int rval = -ENOMEM;
	int m;

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

	rval = init_qib_mregion(&mr->mr, pd, count);
	if (rval)
	goto bail;

	rval = qib_alloc_lkey(&mr->mr, 0);
	if (rval)
	goto bail_mregion;
	mr->ibmr.lkey = mr->mr.lkey;
	mr->ibmr.rkey = mr->mr.lkey;
	done:
	return mr;

	bail_mregion:
	deinit_qib_mregion(&mr->mr);
	bail:
	kfree(mr);
	mr = ERR_PTR(rval);
	goto done;
	}

	/**
	* qib_reg_user_mr - register a userspace memory region
	* @pd: protection domain for this memory region
	* @start: starting userspace address
	* @length: length of region to register
	* @mr_access_flags: access flags for this memory region
	* @udata: unused by the QLogic_IB driver
	*
	* Returns the memory region on success, otherwise returns an errno.
	*/
	struct ib_mr qib_reg_user_mr(struct ib_pd pd, u64 start, u64 length,
	u64 virt_addr, int mr_access_flags,
	struct ib_udata *udata)
	{
	struct qib_mr *mr;
	struct ib_umem *umem;
	struct scatterlist *sg;
	int n, m, entry;
	struct ib_mr *ret;

	if (length == 0) {
	ret = ERR_PTR(-EINVAL);
	goto bail;
	}

	umem = ib_umem_get(pd->uobject->context, start, length,
	mr_access_flags, 0);
	if (IS_ERR(umem))
	return (void *) umem;

	n = umem->nmap;

	mr = alloc_mr(n, pd);
	if (IS_ERR(mr)) {
	ret = (struct ib_mr *)mr;
	ib_umem_release(umem);
	goto bail;
	}

	mr->mr.user_base = start;
	mr->mr.iova = virt_addr;
	mr->mr.length = length;
	mr->mr.offset = ib_umem_offset(umem);
	mr->mr.access_flags = mr_access_flags;
	mr->umem = umem;

	if (is_power_of_2(umem->page_size))
	mr->mr.page_shift = ilog2(umem->page_size);
	m = 0;
	n = 0;
	for_each_sg(umem->sg_head.sgl, sg, umem->nmap, entry) {
	void *vaddr;

	vaddr = page_address(sg_page(sg));
	if (!vaddr) {
	ret = ERR_PTR(-EINVAL);
	goto bail;
	}
	mr->mr.map[m]->segs[n].vaddr = vaddr;
	mr->mr.map[m]->segs[n].length = umem->page_size;
	n++;
	if (n == QIB_SEGSZ) {
	m++;
	n = 0;
	}
	}
	ret = &mr->ibmr;

	bail:
	return ret;
	}

	/**
	* qib_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 qib_get_dma_mr()
	* or qib_reg_user_mr().
	*/
	int qib_dereg_mr(struct ib_mr *ibmr)
	{
	struct qib_mr *mr = to_imr(ibmr);
	int ret = 0;
	unsigned long timeout;

	kfree(mr->pages);
	qib_free_lkey(&mr->mr);

	qib_put_mr(&mr->mr); /* will set completion if last */
	timeout = wait_for_completion_timeout(&mr->mr.comp,
	5 * HZ);
	if (!timeout) {
	qib_get_mr(&mr->mr);
	ret = -EBUSY;
	goto out;
	}
	deinit_qib_mregion(&mr->mr);
	if (mr->umem)
	ib_umem_release(mr->umem);
	kfree(mr);
	out:
	return ret;
	}

	/*
	* Allocate a memory region usable with the
	* IB_WR_REG_MR send work request.
	*
	* Return the memory region on success, otherwise return an errno.
	*/
	struct ib_mr qib_alloc_mr(struct ib_pd pd,
	enum ib_mr_type mr_type,
	u32 max_num_sg)
	{
	struct qib_mr *mr;

	if (mr_type != IB_MR_TYPE_MEM_REG)
	return ERR_PTR(-EINVAL);

	mr = alloc_mr(max_num_sg, pd);
	if (IS_ERR(mr))
	return (struct ib_mr *)mr;

	mr->pages = kcalloc(max_num_sg, sizeof(u64), GFP_KERNEL);
	if (!mr->pages)
	goto err;

	return &mr->ibmr;

	err:
	qib_dereg_mr(&mr->ibmr);
	return ERR_PTR(-ENOMEM);
	}

	static int qib_set_page(struct ib_mr *ibmr, u64 addr)
	{
	struct qib_mr *mr = to_imr(ibmr);

	if (unlikely(mr->npages == mr->mr.max_segs))
	return -ENOMEM;

	mr->pages[mr->npages++] = addr;

	return 0;
	}

	int qib_map_mr_sg(struct ib_mr *ibmr,
	struct scatterlist *sg,
	int sg_nents)
	{
	struct qib_mr *mr = to_imr(ibmr);

	mr->npages = 0;

	return ib_sg_to_pages(ibmr, sg, sg_nents, qib_set_page);
	}

	/**
	* qib_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 qib_alloc_fmr(struct ib_pd pd, int mr_access_flags,
	struct ib_fmr_attr *fmr_attr)
	{
	struct qib_fmr *fmr;
	int m;
	struct ib_fmr *ret;
	int rval = -ENOMEM;

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

	rval = init_qib_mregion(&fmr->mr, pd, fmr_attr->max_pages);
	if (rval)
	goto bail;

	/*
	* ib_alloc_fmr() will initialize fmr->ibfmr except for lkey &
	* rkey.
	*/
	rval = qib_alloc_lkey(&fmr->mr, 0);
	if (rval)
	goto bail_mregion;
	fmr->ibfmr.rkey = fmr->mr.lkey;
	fmr->ibfmr.lkey = fmr->mr.lkey;
	/*
	* Resources are allocated but no valid mapping (RKEY can't be
	* used).
	*/
	fmr->mr.access_flags = mr_access_flags;
	fmr->mr.max_segs = fmr_attr->max_pages;
	fmr->mr.page_shift = fmr_attr->page_shift;

	ret = &fmr->ibfmr;
	done:
	return ret;

	bail_mregion:
	deinit_qib_mregion(&fmr->mr);
	bail:
	kfree(fmr);
	ret = ERR_PTR(rval);
	goto done;
	}

	/**
	* qib_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 qib_map_phys_fmr(struct ib_fmr ibfmr, u64 page_list,
	int list_len, u64 iova)
	{
	struct qib_fmr *fmr = to_ifmr(ibfmr);
	struct qib_lkey_table *rkt;
	unsigned long flags;
	int m, n, i;
	u32 ps;
	int ret;

	i = atomic_read(&fmr->mr.refcount);
	if (i > 2)
	return -EBUSY;

	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->mr.page_shift;
	fmr->mr.length = list_len * ps;
	m = 0;
	n = 0;
	for (i = 0; i < list_len; i++) {
	fmr->mr.map[m]->segs[n].vaddr = (void *) page_list[i];
	fmr->mr.map[m]->segs[n].length = ps;
	if (++n == QIB_SEGSZ) {
	m++;
	n = 0;
	}
	}
	spin_unlock_irqrestore(&rkt->lock, flags);
	ret = 0;

	bail:
	return ret;
	}

	/**
	* qib_unmap_fmr - unmap fast memory regions
	* @fmr_list: the list of fast memory regions to unmap
	*
	* Returns 0 on success.
	*/
	int qib_unmap_fmr(struct list_head *fmr_list)
	{
	struct qib_fmr *fmr;
	struct qib_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;
	}

	/**
	* qib_dealloc_fmr - deallocate a fast memory region
	* @ibfmr: the fast memory region to deallocate
	*
	* Returns 0 on success.
	*/
	int qib_dealloc_fmr(struct ib_fmr *ibfmr)
	{
	struct qib_fmr *fmr = to_ifmr(ibfmr);
	int ret = 0;
	unsigned long timeout;

	qib_free_lkey(&fmr->mr);
	qib_put_mr(&fmr->mr); /* will set completion if last */
	timeout = wait_for_completion_timeout(&fmr->mr.comp,
	5 * HZ);
	if (!timeout) {
	qib_get_mr(&fmr->mr);
	ret = -EBUSY;
	goto out;
	}
	deinit_qib_mregion(&fmr->mr);
	kfree(fmr);
	out:
	return ret;
	}

	void mr_rcu_callback(struct rcu_head *list)
	{
	struct qib_mregion *mr = container_of(list, struct qib_mregion, list);

	complete(&mr->comp);
	}