[linux-2.6-block.git] / drivers / staging / rdma / ipath / ipath_mr.c

/*
 * Copyright (c) 2006, 2007 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 <linux/slab.h>

#include <rdma/ib_umem.h>
#include <rdma/ib_pack.h>
#include <rdma/ib_smi.h>

#include "ipath_verbs.h"

/* Fast memory region */
struct ipath_fmr {
	struct ib_fmr ibfmr;
	u8 page_shift;
	struct ipath_mregion mr;        /* must be last */
};

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

/**
 * 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.
 * Note that all DMA addresses should be created via the
 * struct ib_dma_mapping_ops functions (see ipath_dma.c).
 */
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;

	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_user_mr - register a userspace memory region
 * @pd: protection domain for this memory region
 * @start: starting userspace address
 * @length: length of region to register
 * @virt_addr: virtual address to use (from HCA's point of view)
 * @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, u64 start, u64 length,
				u64 virt_addr, int mr_access_flags,
				struct ib_udata *udata)
{
	struct ipath_mr *mr;
	struct ib_umem *umem;
	int n, m, entry;
	struct scatterlist *sg;
	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, &to_idev(pd->device)->lk_table);
	if (!mr) {
		ret = ERR_PTR(-ENOMEM);
		ib_umem_release(umem);
		goto bail;
	}

	mr->mr.pd = pd;
	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->mr.max_segs = n;
	mr->umem = umem;

	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 == 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]);
	}

	if (mr->umem)
		ib_umem_release(mr->umem);

	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.pd = pd;
	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 = (void *) 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;
}
Commit	Line	Data
cef1cce5	1	/*
87427da5	2	* Copyright (c) 2006, 2007 QLogic Corporation. All rights reserved.
cef1cce5 BS	3	* Copyright (c) 2005, 2006 PathScale, Inc. All rights reserved.
	4	*
	5	* This software is available to you under a choice of one of two
	6	* licenses. You may choose to be licensed under the terms of the GNU
	7	* General Public License (GPL) Version 2, available from the file
	8	* COPYING in the main directory of this source tree, or the
	9	* OpenIB.org BSD license below:
	10	*
	11	* Redistribution and use in source and binary forms, with or
	12	* without modification, are permitted provided that the following
	13	* conditions are met:
	14	*
	15	* - Redistributions of source code must retain the above
	16	* copyright notice, this list of conditions and the following
	17	* disclaimer.
	18	*
	19	* - Redistributions in binary form must reproduce the above
	20	* copyright notice, this list of conditions and the following
	21	* disclaimer in the documentation and/or other materials
	22	* provided with the distribution.
	23	*
	24	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	25	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	26	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
	27	* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
	28	* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
	29	* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
	30	* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	31	* SOFTWARE.
	32	*/
	33
5a0e3ad6 TH	34	#include <linux/slab.h>
5a0e3ad6 TH	35
f7c6a7b5	36	#include <rdma/ib_umem.h>
cef1cce5 BS	37	#include <rdma/ib_pack.h>
	38	#include <rdma/ib_smi.h>
	39
	40	#include "ipath_verbs.h"
	41
34b2aafe BS	42	/* Fast memory region */
	43	struct ipath_fmr {
	44	struct ib_fmr ibfmr;
	45	u8 page_shift;
	46	struct ipath_mregion mr; /* must be last */
	47	};
	48
	49	static inline struct ipath_fmr to_ifmr(struct ib_fmr ibfmr)
	50	{
	51	return container_of(ibfmr, struct ipath_fmr, ibfmr);
	52	}
	53
cef1cce5 BS	54	/**
	55	* ipath_get_dma_mr - get a DMA memory region
	56	* @pd: protection domain for this memory region
	57	* @acc: access flags
	58	*
	59	* Returns the memory region on success, otherwise returns an errno.
f2cbb660 RC	60	* Note that all DMA addresses should be created via the
f2cbb660 RC	61	* struct ib_dma_mapping_ops functions (see ipath_dma.c).
cef1cce5 BS	62	*/
	63	struct ib_mr ipath_get_dma_mr(struct ib_pd pd, int acc)
	64	{
	65	struct ipath_mr *mr;
	66	struct ib_mr *ret;
	67
	68	mr = kzalloc(sizeof *mr, GFP_KERNEL);
	69	if (!mr) {
	70	ret = ERR_PTR(-ENOMEM);
	71	goto bail;
	72	}
	73
	74	mr->mr.access_flags = acc;
	75	ret = &mr->ibmr;
	76
	77	bail:
	78	return ret;
	79	}
	80
	81	static struct ipath_mr *alloc_mr(int count,
	82	struct ipath_lkey_table *lk_table)
	83	{
	84	struct ipath_mr *mr;
	85	int m, i = 0;
	86
	87	/* Allocate struct plus pointers to first level page tables. */
	88	m = (count + IPATH_SEGSZ - 1) / IPATH_SEGSZ;
	89	mr = kmalloc(sizeof mr + m sizeof mr->mr.map[0], GFP_KERNEL);
	90	if (!mr)
	91	goto done;
	92
	93	/* Allocate first level page tables. */
	94	for (; i < m; i++) {
	95	mr->mr.map[i] = kmalloc(sizeof *mr->mr.map[0], GFP_KERNEL);
	96	if (!mr->mr.map[i])
	97	goto bail;
	98	}
	99	mr->mr.mapsz = m;
	100
cef1cce5 BS	101	if (!ipath_alloc_lkey(lk_table, &mr->mr))
	102	goto bail;
	103	mr->ibmr.rkey = mr->ibmr.lkey = mr->mr.lkey;
	104
	105	goto done;
	106
	107	bail:
	108	while (i) {
	109	i--;
	110	kfree(mr->mr.map[i]);
	111	}
	112	kfree(mr);
	113	mr = NULL;
	114
	115	done:
	116	return mr;
	117	}
	118
cef1cce5 BS	119	/**
	120	* ipath_reg_user_mr - register a userspace memory region
	121	* @pd: protection domain for this memory region
f7c6a7b5 RD	122	* @start: starting userspace address
	123	* @length: length of region to register
	124	* @virt_addr: virtual address to use (from HCA's point of view)
cef1cce5 BS	125	* @mr_access_flags: access flags for this memory region
	126	* @udata: unused by the InfiniPath driver
	127	*
	128	* Returns the memory region on success, otherwise returns an errno.
	129	*/
f7c6a7b5 RD	130	struct ib_mr ipath_reg_user_mr(struct ib_pd pd, u64 start, u64 length,
	131	u64 virt_addr, int mr_access_flags,
	132	struct ib_udata *udata)
cef1cce5 BS	133	{
cef1cce5 BS	134	struct ipath_mr *mr;
f7c6a7b5	135	struct ib_umem *umem;
eeb8461e YH	136	int n, m, entry;
eeb8461e YH	137	struct scatterlist *sg;
cef1cce5 BS	138	struct ib_mr *ret;
cef1cce5 BS	139
f7c6a7b5	140	if (length == 0) {
4a45b7d4 BS	141	ret = ERR_PTR(-EINVAL);
	142	goto bail;
	143	}
	144
cb9fbc5c AK	145	umem = ib_umem_get(pd->uobject->context, start, length,
cb9fbc5c AK	146	mr_access_flags, 0);
f7c6a7b5 RD	147	if (IS_ERR(umem))
	148	return (void *) umem;
	149
eeb8461e	150	n = umem->nmap;
cef1cce5 BS	151	mr = alloc_mr(n, &to_idev(pd->device)->lk_table);
	152	if (!mr) {
	153	ret = ERR_PTR(-ENOMEM);
f7c6a7b5	154	ib_umem_release(umem);
cef1cce5 BS	155	goto bail;
	156	}
	157
6a553af2	158	mr->mr.pd = pd;
f7c6a7b5 RD	159	mr->mr.user_base = start;
	160	mr->mr.iova = virt_addr;
	161	mr->mr.length = length;
406f9e5f	162	mr->mr.offset = ib_umem_offset(umem);
cef1cce5 BS	163	mr->mr.access_flags = mr_access_flags;
cef1cce5 BS	164	mr->mr.max_segs = n;
f7c6a7b5	165	mr->umem = umem;
cef1cce5 BS	166
	167	m = 0;
	168	n = 0;
eeb8461e YH	169	for_each_sg(umem->sg_head.sgl, sg, umem->nmap, entry) {
	170	void *vaddr;
	171
	172	vaddr = page_address(sg_page(sg));
	173	if (!vaddr) {
	174	ret = ERR_PTR(-EINVAL);
	175	goto bail;
	176	}
	177	mr->mr.map[m]->segs[n].vaddr = vaddr;
	178	mr->mr.map[m]->segs[n].length = umem->page_size;
	179	n++;
	180	if (n == IPATH_SEGSZ) {
	181	m++;
	182	n = 0;
cef1cce5 BS	183	}
	184	}
	185	ret = &mr->ibmr;
	186
	187	bail:
	188	return ret;
	189	}
	190
	191	/**
	192	* ipath_dereg_mr - unregister and free a memory region
	193	* @ibmr: the memory region to free
	194	*
	195	* Returns 0 on success.
	196	*
	197	* Note that this is called to free MRs created by ipath_get_dma_mr()
	198	* or ipath_reg_user_mr().
	199	*/
	200	int ipath_dereg_mr(struct ib_mr *ibmr)
	201	{
	202	struct ipath_mr *mr = to_imr(ibmr);
	203	int i;
	204
	205	ipath_free_lkey(&to_idev(ibmr->device)->lk_table, ibmr->lkey);
	206	i = mr->mr.mapsz;
	207	while (i) {
	208	i--;
	209	kfree(mr->mr.map[i]);
	210	}
f7c6a7b5 RD	211
	212	if (mr->umem)
	213	ib_umem_release(mr->umem);
	214
cef1cce5 BS	215	kfree(mr);
	216	return 0;
	217	}
	218
	219	/**
	220	* ipath_alloc_fmr - allocate a fast memory region
	221	* @pd: the protection domain for this memory region
	222	* @mr_access_flags: access flags for this memory region
	223	* @fmr_attr: fast memory region attributes
	224	*
	225	* Returns the memory region on success, otherwise returns an errno.
	226	*/
	227	struct ib_fmr ipath_alloc_fmr(struct ib_pd pd, int mr_access_flags,
	228	struct ib_fmr_attr *fmr_attr)
	229	{
	230	struct ipath_fmr *fmr;
	231	int m, i = 0;
	232	struct ib_fmr *ret;
	233
	234	/* Allocate struct plus pointers to first level page tables. */
	235	m = (fmr_attr->max_pages + IPATH_SEGSZ - 1) / IPATH_SEGSZ;
	236	fmr = kmalloc(sizeof fmr + m sizeof fmr->mr.map[0], GFP_KERNEL);
	237	if (!fmr)
	238	goto bail;
	239
	240	/* Allocate first level page tables. */
	241	for (; i < m; i++) {
	242	fmr->mr.map[i] = kmalloc(sizeof *fmr->mr.map[0],
	243	GFP_KERNEL);
	244	if (!fmr->mr.map[i])
	245	goto bail;
	246	}
	247	fmr->mr.mapsz = m;
	248
	249	/*
	250	* ib_alloc_fmr() will initialize fmr->ibfmr except for lkey &
	251	* rkey.
	252	*/
	253	if (!ipath_alloc_lkey(&to_idev(pd->device)->lk_table, &fmr->mr))
	254	goto bail;
	255	fmr->ibfmr.rkey = fmr->ibfmr.lkey = fmr->mr.lkey;
	256	/*
	257	* Resources are allocated but no valid mapping (RKEY can't be
	258	* used).
	259	*/
6a553af2	260	fmr->mr.pd = pd;
cef1cce5 BS	261	fmr->mr.user_base = 0;
	262	fmr->mr.iova = 0;
	263	fmr->mr.length = 0;
	264	fmr->mr.offset = 0;
	265	fmr->mr.access_flags = mr_access_flags;
	266	fmr->mr.max_segs = fmr_attr->max_pages;
	267	fmr->page_shift = fmr_attr->page_shift;
	268
	269	ret = &fmr->ibfmr;
	270	goto done;
	271
	272	bail:
	273	while (i)
	274	kfree(fmr->mr.map[--i]);
	275	kfree(fmr);
	276	ret = ERR_PTR(-ENOMEM);
	277
	278	done:
	279	return ret;
	280	}
	281
	282	/**
	283	* ipath_map_phys_fmr - set up a fast memory region
	284	* @ibmfr: the fast memory region to set up
	285	* @page_list: the list of pages to associate with the fast memory region
	286	* @list_len: the number of pages to associate with the fast memory region
	287	* @iova: the virtual address of the start of the fast memory region
	288	*
	289	* This may be called from interrupt context.
	290	*/
	291
	292	int ipath_map_phys_fmr(struct ib_fmr ibfmr, u64 page_list,
	293	int list_len, u64 iova)
	294	{
	295	struct ipath_fmr *fmr = to_ifmr(ibfmr);
	296	struct ipath_lkey_table *rkt;
	297	unsigned long flags;
	298	int m, n, i;
	299	u32 ps;
	300	int ret;
	301
	302	if (list_len > fmr->mr.max_segs) {
	303	ret = -EINVAL;
	304	goto bail;
	305	}
	306	rkt = &to_idev(ibfmr->device)->lk_table;
	307	spin_lock_irqsave(&rkt->lock, flags);
	308	fmr->mr.user_base = iova;
	309	fmr->mr.iova = iova;
	310	ps = 1 << fmr->page_shift;
	311	fmr->mr.length = list_len * ps;
	312	m = 0;
	313	n = 0;
	314	ps = 1 << fmr->page_shift;
	315	for (i = 0; i < list_len; i++) {
f2cbb660	316	fmr->mr.map[m]->segs[n].vaddr = (void *) page_list[i];
cef1cce5 BS	317	fmr->mr.map[m]->segs[n].length = ps;
	318	if (++n == IPATH_SEGSZ) {
	319	m++;
	320	n = 0;
	321	}
	322	}
	323	spin_unlock_irqrestore(&rkt->lock, flags);
	324	ret = 0;
	325
	326	bail:
	327	return ret;
	328	}
	329
	330	/**
	331	* ipath_unmap_fmr - unmap fast memory regions
	332	* @fmr_list: the list of fast memory regions to unmap
	333	*
	334	* Returns 0 on success.
	335	*/
	336	int ipath_unmap_fmr(struct list_head *fmr_list)
	337	{
	338	struct ipath_fmr *fmr;
	339	struct ipath_lkey_table *rkt;
	340	unsigned long flags;
	341
	342	list_for_each_entry(fmr, fmr_list, ibfmr.list) {
	343	rkt = &to_idev(fmr->ibfmr.device)->lk_table;
	344	spin_lock_irqsave(&rkt->lock, flags);
	345	fmr->mr.user_base = 0;
	346	fmr->mr.iova = 0;
	347	fmr->mr.length = 0;
	348	spin_unlock_irqrestore(&rkt->lock, flags);
	349	}
	350	return 0;
	351	}
	352
	353	/**
	354	* ipath_dealloc_fmr - deallocate a fast memory region
	355	* @ibfmr: the fast memory region to deallocate
	356	*
	357	* Returns 0 on success.
	358	*/
	359	int ipath_dealloc_fmr(struct ib_fmr *ibfmr)
	360	{
	361	struct ipath_fmr *fmr = to_ifmr(ibfmr);
	362	int i;
	363
	364	ipath_free_lkey(&to_idev(ibfmr->device)->lk_table, ibfmr->lkey);
	365	i = fmr->mr.mapsz;
	366	while (i)
	367	kfree(fmr->mr.map[--i]);
	368	kfree(fmr);
	369	return 0;
	370	}