xref: /drivers/infiniband/hw/ehca/ehca_mrmw.c

/*
 *  IBM eServer eHCA Infiniband device driver for Linux on POWER
 *
 *  MR/MW functions
 *
 *  Authors: Dietmar Decker <ddecker@de.ibm.com>
 *           Christoph Raisch <raisch@de.ibm.com>
 *
 *  Copyright (c) 2005 IBM Corporation
 *
 *  All rights reserved.
 *
 *  This source code is distributed under a dual license of GPL v2.0 and OpenIB
 *  BSD.
 *
 * OpenIB BSD License
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <rdma/ib_umem.h>

#include <asm/current.h>

#include "ehca_iverbs.h"
#include "ehca_mrmw.h"
#include "hcp_if.h"
#include "hipz_hw.h"

static struct kmem_cache *mr_cache;
static struct kmem_cache *mw_cache;

static struct ehca_mr *ehca_mr_new(void)
{
	struct ehca_mr *me;

	me = kmem_cache_zalloc(mr_cache, GFP_KERNEL);
	if (me) {
		spin_lock_init(&me->mrlock);
	} else
		ehca_gen_err("alloc failed");

	return me;
}

static void ehca_mr_delete(struct ehca_mr *me)
{
	kmem_cache_free(mr_cache, me);
}

static struct ehca_mw *ehca_mw_new(void)
{
	struct ehca_mw *me;

	me = kmem_cache_zalloc(mw_cache, GFP_KERNEL);
	if (me) {
		spin_lock_init(&me->mwlock);
	} else
		ehca_gen_err("alloc failed");

	return me;
}

static void ehca_mw_delete(struct ehca_mw *me)
{
	kmem_cache_free(mw_cache, me);
}

/*----------------------------------------------------------------------*/

struct ib_mr *ehca_get_dma_mr(struct ib_pd *pd, int mr_access_flags)
{
	struct ib_mr *ib_mr;
	int ret;
	struct ehca_mr *e_maxmr;
	struct ehca_pd *e_pd = container_of(pd, struct ehca_pd, ib_pd);
	struct ehca_shca *shca =
		container_of(pd->device, struct ehca_shca, ib_device);

	if (shca->maxmr) {
		e_maxmr = ehca_mr_new();
		if (!e_maxmr) {
			ehca_err(&shca->ib_device, "out of memory");
			ib_mr = ERR_PTR(-ENOMEM);
			goto get_dma_mr_exit0;
		}

		ret = ehca_reg_maxmr(shca, e_maxmr, (u64*)KERNELBASE,
				     mr_access_flags, e_pd,
				     &e_maxmr->ib.ib_mr.lkey,
				     &e_maxmr->ib.ib_mr.rkey);
		if (ret) {
			ehca_mr_delete(e_maxmr);
			ib_mr = ERR_PTR(ret);
			goto get_dma_mr_exit0;
		}
		ib_mr = &e_maxmr->ib.ib_mr;
	} else {
		ehca_err(&shca->ib_device, "no internal max-MR exist!");
		ib_mr = ERR_PTR(-EINVAL);
		goto get_dma_mr_exit0;
	}

get_dma_mr_exit0:
	if (IS_ERR(ib_mr))
		ehca_err(&shca->ib_device, "rc=%lx pd=%p mr_access_flags=%x ",
			 PTR_ERR(ib_mr), pd, mr_access_flags);
	return ib_mr;
} /* end ehca_get_dma_mr() */

/*----------------------------------------------------------------------*/

struct ib_mr *ehca_reg_phys_mr(struct ib_pd *pd,
			       struct ib_phys_buf *phys_buf_array,
			       int num_phys_buf,
			       int mr_access_flags,
			       u64 *iova_start)
{
	struct ib_mr *ib_mr;
	int ret;
	struct ehca_mr *e_mr;
	struct ehca_shca *shca =
		container_of(pd->device, struct ehca_shca, ib_device);
	struct ehca_pd *e_pd = container_of(pd, struct ehca_pd, ib_pd);

	u64 size;
	struct ehca_mr_pginfo pginfo={0,0,0,0,0,0,0,NULL,0,NULL,NULL,0,NULL,0};
	u32 num_pages_mr;
	u32 num_pages_4k; /* 4k portion "pages" */

	if ((num_phys_buf <= 0) || !phys_buf_array) {
		ehca_err(pd->device, "bad input values: num_phys_buf=%x "
			 "phys_buf_array=%p", num_phys_buf, phys_buf_array);
		ib_mr = ERR_PTR(-EINVAL);
		goto reg_phys_mr_exit0;
	}
	if (((mr_access_flags & IB_ACCESS_REMOTE_WRITE) &&
	     !(mr_access_flags & IB_ACCESS_LOCAL_WRITE)) ||
	    ((mr_access_flags & IB_ACCESS_REMOTE_ATOMIC) &&
	     !(mr_access_flags & IB_ACCESS_LOCAL_WRITE))) {
		/*
		 * Remote Write Access requires Local Write Access
		 * Remote Atomic Access requires Local Write Access
		 */
		ehca_err(pd->device, "bad input values: mr_access_flags=%x",
			 mr_access_flags);
		ib_mr = ERR_PTR(-EINVAL);
		goto reg_phys_mr_exit0;
	}

	/* check physical buffer list and calculate size */
	ret = ehca_mr_chk_buf_and_calc_size(phys_buf_array, num_phys_buf,
					    iova_start, &size);
	if (ret) {
		ib_mr = ERR_PTR(ret);
		goto reg_phys_mr_exit0;
	}
	if ((size == 0) ||
	    (((u64)iova_start + size) < (u64)iova_start)) {
		ehca_err(pd->device, "bad input values: size=%lx iova_start=%p",
			 size, iova_start);
		ib_mr = ERR_PTR(-EINVAL);
		goto reg_phys_mr_exit0;
	}

	e_mr = ehca_mr_new();
	if (!e_mr) {
		ehca_err(pd->device, "out of memory");
		ib_mr = ERR_PTR(-ENOMEM);
		goto reg_phys_mr_exit0;
	}

	/* determine number of MR pages */
	num_pages_mr = ((((u64)iova_start % PAGE_SIZE) + size +
			 PAGE_SIZE - 1) / PAGE_SIZE);
	num_pages_4k = ((((u64)iova_start % EHCA_PAGESIZE) + size +
			 EHCA_PAGESIZE - 1) / EHCA_PAGESIZE);

	/* register MR on HCA */
	if (ehca_mr_is_maxmr(size, iova_start)) {
		e_mr->flags |= EHCA_MR_FLAG_MAXMR;
		ret = ehca_reg_maxmr(shca, e_mr, iova_start, mr_access_flags,
				     e_pd, &e_mr->ib.ib_mr.lkey,
				     &e_mr->ib.ib_mr.rkey);
		if (ret) {
			ib_mr = ERR_PTR(ret);
			goto reg_phys_mr_exit1;
		}
	} else {
		pginfo.type           = EHCA_MR_PGI_PHYS;
		pginfo.num_pages      = num_pages_mr;
		pginfo.num_4k         = num_pages_4k;
		pginfo.num_phys_buf   = num_phys_buf;
		pginfo.phys_buf_array = phys_buf_array;
		pginfo.next_4k        = (((u64)iova_start & ~PAGE_MASK) /
					 EHCA_PAGESIZE);

		ret = ehca_reg_mr(shca, e_mr, iova_start, size, mr_access_flags,
				  e_pd, &pginfo, &e_mr->ib.ib_mr.lkey,
				  &e_mr->ib.ib_mr.rkey);
		if (ret) {
			ib_mr = ERR_PTR(ret);
			goto reg_phys_mr_exit1;
		}
	}

	/* successful registration of all pages */
	return &e_mr->ib.ib_mr;

reg_phys_mr_exit1:
	ehca_mr_delete(e_mr);
reg_phys_mr_exit0:
	if (IS_ERR(ib_mr))
		ehca_err(pd->device, "rc=%lx pd=%p phys_buf_array=%p "
			 "num_phys_buf=%x mr_access_flags=%x iova_start=%p",
			 PTR_ERR(ib_mr), pd, phys_buf_array,
			 num_phys_buf, mr_access_flags, iova_start);
	return ib_mr;
} /* end ehca_reg_phys_mr() */

/*----------------------------------------------------------------------*/

struct ib_mr *ehca_reg_user_mr(struct ib_pd *pd, u64 start, u64 length, u64 virt,
			       int mr_access_flags, struct ib_udata *udata)
{
	struct ib_mr *ib_mr;
	struct ehca_mr *e_mr;
	struct ehca_shca *shca =
		container_of(pd->device, struct ehca_shca, ib_device);
	struct ehca_pd *e_pd = container_of(pd, struct ehca_pd, ib_pd);
	struct ehca_mr_pginfo pginfo={0,0,0,0,0,0,0,NULL,0,NULL,NULL,0,NULL,0};
	int ret;
	u32 num_pages_mr;
	u32 num_pages_4k; /* 4k portion "pages" */

	if (!pd) {
		ehca_gen_err("bad pd=%p", pd);
		return ERR_PTR(-EFAULT);
	}

	if (((mr_access_flags & IB_ACCESS_REMOTE_WRITE) &&
	     !(mr_access_flags & IB_ACCESS_LOCAL_WRITE)) ||
	    ((mr_access_flags & IB_ACCESS_REMOTE_ATOMIC) &&
	     !(mr_access_flags & IB_ACCESS_LOCAL_WRITE))) {
		/*
		 * Remote Write Access requires Local Write Access
		 * Remote Atomic Access requires Local Write Access
		 */
		ehca_err(pd->device, "bad input values: mr_access_flags=%x",
			 mr_access_flags);
		ib_mr = ERR_PTR(-EINVAL);
		goto reg_user_mr_exit0;
	}

	if (length == 0 || virt + length < virt) {
		ehca_err(pd->device, "bad input values: length=%lx "
			 "virt_base=%lx", length, virt);
		ib_mr = ERR_PTR(-EINVAL);
		goto reg_user_mr_exit0;
	}

	e_mr = ehca_mr_new();
	if (!e_mr) {
		ehca_err(pd->device, "out of memory");
		ib_mr = ERR_PTR(-ENOMEM);
		goto reg_user_mr_exit0;
	}

	e_mr->umem = ib_umem_get(pd->uobject->context, start, length,
				 mr_access_flags);
	if (IS_ERR(e_mr->umem)) {
		ib_mr = (void *) e_mr->umem;
		goto reg_user_mr_exit1;
	}

	if (e_mr->umem->page_size != PAGE_SIZE) {
		ehca_err(pd->device, "page size not supported, "
			 "e_mr->umem->page_size=%x", e_mr->umem->page_size);
		ib_mr = ERR_PTR(-EINVAL);
		goto reg_user_mr_exit2;
	}

	/* determine number of MR pages */
	num_pages_mr = (((virt % PAGE_SIZE) + length + PAGE_SIZE - 1) /
			PAGE_SIZE);
	num_pages_4k = (((virt % EHCA_PAGESIZE) + length + EHCA_PAGESIZE - 1) /
			EHCA_PAGESIZE);

	/* register MR on HCA */
	pginfo.type       = EHCA_MR_PGI_USER;
	pginfo.num_pages  = num_pages_mr;
	pginfo.num_4k     = num_pages_4k;
	pginfo.region     = e_mr->umem;
	pginfo.next_4k	  = e_mr->umem->offset / EHCA_PAGESIZE;
	pginfo.next_chunk = list_prepare_entry(pginfo.next_chunk,
					       (&e_mr->umem->chunk_list),
					       list);

	ret = ehca_reg_mr(shca, e_mr, (u64*) virt, length, mr_access_flags, e_pd,
			  &pginfo, &e_mr->ib.ib_mr.lkey, &e_mr->ib.ib_mr.rkey);
	if (ret) {
		ib_mr = ERR_PTR(ret);
		goto reg_user_mr_exit2;
	}

	/* successful registration of all pages */
	return &e_mr->ib.ib_mr;

reg_user_mr_exit2:
	ib_umem_release(e_mr->umem);
reg_user_mr_exit1:
	ehca_mr_delete(e_mr);
reg_user_mr_exit0:
	if (IS_ERR(ib_mr))
		ehca_err(pd->device, "rc=%lx pd=%p mr_access_flags=%x"
			 " udata=%p",
			 PTR_ERR(ib_mr), pd, mr_access_flags, udata);
	return ib_mr;
} /* end ehca_reg_user_mr() */

/*----------------------------------------------------------------------*/

int ehca_rereg_phys_mr(struct ib_mr *mr,
		       int mr_rereg_mask,
		       struct ib_pd *pd,
		       struct ib_phys_buf *phys_buf_array,
		       int num_phys_buf,
		       int mr_access_flags,
		       u64 *iova_start)
{
	int ret;

	struct ehca_shca *shca =
		container_of(mr->device, struct ehca_shca, ib_device);
	struct ehca_mr *e_mr = container_of(mr, struct ehca_mr, ib.ib_mr);
	struct ehca_pd *my_pd = container_of(mr->pd, struct ehca_pd, ib_pd);
	u64 new_size;
	u64 *new_start;
	u32 new_acl;
	struct ehca_pd *new_pd;
	u32 tmp_lkey, tmp_rkey;
	unsigned long sl_flags;
	u32 num_pages_mr = 0;
	u32 num_pages_4k = 0; /* 4k portion "pages" */
	struct ehca_mr_pginfo pginfo={0,0,0,0,0,0,0,NULL,0,NULL,NULL,0,NULL,0};
	u32 cur_pid = current->tgid;

	if (my_pd->ib_pd.uobject && my_pd->ib_pd.uobject->context &&
	    (my_pd->ownpid != cur_pid)) {
		ehca_err(mr->device, "Invalid caller pid=%x ownpid=%x",
			 cur_pid, my_pd->ownpid);
		ret = -EINVAL;
		goto rereg_phys_mr_exit0;
	}

	if (!(mr_rereg_mask & IB_MR_REREG_TRANS)) {
		/* TODO not supported, because PHYP rereg hCall needs pages */
		ehca_err(mr->device, "rereg without IB_MR_REREG_TRANS not "
			 "supported yet, mr_rereg_mask=%x", mr_rereg_mask);
		ret = -EINVAL;
		goto rereg_phys_mr_exit0;
	}

	if (mr_rereg_mask & IB_MR_REREG_PD) {
		if (!pd) {
			ehca_err(mr->device, "rereg with bad pd, pd=%p "
				 "mr_rereg_mask=%x", pd, mr_rereg_mask);
			ret = -EINVAL;
			goto rereg_phys_mr_exit0;
		}
	}

	if ((mr_rereg_mask &
	     ~(IB_MR_REREG_TRANS | IB_MR_REREG_PD | IB_MR_REREG_ACCESS)) ||
	    (mr_rereg_mask == 0)) {
		ret = -EINVAL;
		goto rereg_phys_mr_exit0;
	}

	/* check other parameters */
	if (e_mr == shca->maxmr) {
		/* should be impossible, however reject to be sure */
		ehca_err(mr->device, "rereg internal max-MR impossible, mr=%p "
			 "shca->maxmr=%p mr->lkey=%x",
			 mr, shca->maxmr, mr->lkey);
		ret = -EINVAL;
		goto rereg_phys_mr_exit0;
	}
	if (mr_rereg_mask & IB_MR_REREG_TRANS) { /* transl., i.e. addr/size */
		if (e_mr->flags & EHCA_MR_FLAG_FMR) {
			ehca_err(mr->device, "not supported for FMR, mr=%p "
				 "flags=%x", mr, e_mr->flags);
			ret = -EINVAL;
			goto rereg_phys_mr_exit0;
		}
		if (!phys_buf_array || num_phys_buf <= 0) {
			ehca_err(mr->device, "bad input values: mr_rereg_mask=%x"
				 " phys_buf_array=%p num_phys_buf=%x",
				 mr_rereg_mask, phys_buf_array, num_phys_buf);
			ret = -EINVAL;
			goto rereg_phys_mr_exit0;
		}
	}
	if ((mr_rereg_mask & IB_MR_REREG_ACCESS) &&	/* change ACL */
	    (((mr_access_flags & IB_ACCESS_REMOTE_WRITE) &&
	      !(mr_access_flags & IB_ACCESS_LOCAL_WRITE)) ||
	     ((mr_access_flags & IB_ACCESS_REMOTE_ATOMIC) &&
	      !(mr_access_flags & IB_ACCESS_LOCAL_WRITE)))) {
		/*
		 * Remote Write Access requires Local Write Access
		 * Remote Atomic Access requires Local Write Access
		 */
		ehca_err(mr->device, "bad input values: mr_rereg_mask=%x "
			 "mr_access_flags=%x", mr_rereg_mask, mr_access_flags);
		ret = -EINVAL;
		goto rereg_phys_mr_exit0;
	}

	/* set requested values dependent on rereg request */
	spin_lock_irqsave(&e_mr->mrlock, sl_flags);
	new_start = e_mr->start;  /* new == old address */
	new_size  = e_mr->size;	  /* new == old length */
	new_acl   = e_mr->acl;	  /* new == old access control */
	new_pd    = container_of(mr->pd,struct ehca_pd,ib_pd); /*new == old PD*/

	if (mr_rereg_mask & IB_MR_REREG_TRANS) {
		new_start = iova_start;	/* change address */
		/* check physical buffer list and calculate size */
		ret = ehca_mr_chk_buf_and_calc_size(phys_buf_array,
						    num_phys_buf, iova_start,
						    &new_size);
		if (ret)
			goto rereg_phys_mr_exit1;
		if ((new_size == 0) ||
		    (((u64)iova_start + new_size) < (u64)iova_start)) {
			ehca_err(mr->device, "bad input values: new_size=%lx "
				 "iova_start=%p", new_size, iova_start);
			ret = -EINVAL;
			goto rereg_phys_mr_exit1;
		}
		num_pages_mr = ((((u64)new_start % PAGE_SIZE) + new_size +
				 PAGE_SIZE - 1) / PAGE_SIZE);
		num_pages_4k = ((((u64)new_start % EHCA_PAGESIZE) + new_size +
				 EHCA_PAGESIZE - 1) / EHCA_PAGESIZE);
		pginfo.type           = EHCA_MR_PGI_PHYS;
		pginfo.num_pages      = num_pages_mr;
		pginfo.num_4k         = num_pages_4k;
		pginfo.num_phys_buf   = num_phys_buf;
		pginfo.phys_buf_array = phys_buf_array;
		pginfo.next_4k        = (((u64)iova_start & ~PAGE_MASK) /
					 EHCA_PAGESIZE);
	}
	if (mr_rereg_mask & IB_MR_REREG_ACCESS)
		new_acl = mr_access_flags;
	if (mr_rereg_mask & IB_MR_REREG_PD)
		new_pd = container_of(pd, struct ehca_pd, ib_pd);

	ret = ehca_rereg_mr(shca, e_mr, new_start, new_size, new_acl,
			    new_pd, &pginfo, &tmp_lkey, &tmp_rkey);
	if (ret)
		goto rereg_phys_mr_exit1;

	/* successful reregistration */
	if (mr_rereg_mask & IB_MR_REREG_PD)
		mr->pd = pd;
	mr->lkey = tmp_lkey;
	mr->rkey = tmp_rkey;

rereg_phys_mr_exit1:
	spin_unlock_irqrestore(&e_mr->mrlock, sl_flags);
rereg_phys_mr_exit0:
	if (ret)
		ehca_err(mr->device, "ret=%x mr=%p mr_rereg_mask=%x pd=%p "
			 "phys_buf_array=%p num_phys_buf=%x mr_access_flags=%x "
			 "iova_start=%p",
			 ret, mr, mr_rereg_mask, pd, phys_buf_array,
			 num_phys_buf, mr_access_flags, iova_start);
	return ret;
} /* end ehca_rereg_phys_mr() */

/*----------------------------------------------------------------------*/

int ehca_query_mr(struct ib_mr *mr, struct ib_mr_attr *mr_attr)
{
	int ret = 0;
	u64 h_ret;
	struct ehca_shca *shca =
		container_of(mr->device, struct ehca_shca, ib_device);
	struct ehca_mr *e_mr = container_of(mr, struct ehca_mr, ib.ib_mr);
	struct ehca_pd *my_pd = container_of(mr->pd, struct ehca_pd, ib_pd);
	u32 cur_pid = current->tgid;
	unsigned long sl_flags;
	struct ehca_mr_hipzout_parms hipzout = {{0},0,0,0,0,0};

	if (my_pd->ib_pd.uobject && my_pd->ib_pd.uobject->context &&
	    (my_pd->ownpid != cur_pid)) {
		ehca_err(mr->device, "Invalid caller pid=%x ownpid=%x",
			 cur_pid, my_pd->ownpid);
		ret = -EINVAL;
		goto query_mr_exit0;
	}

	if ((e_mr->flags & EHCA_MR_FLAG_FMR)) {
		ehca_err(mr->device, "not supported for FMR, mr=%p e_mr=%p "
			 "e_mr->flags=%x", mr, e_mr, e_mr->flags);
		ret = -EINVAL;
		goto query_mr_exit0;
	}

	memset(mr_attr, 0, sizeof(struct ib_mr_attr));
	spin_lock_irqsave(&e_mr->mrlock, sl_flags);

	h_ret = hipz_h_query_mr(shca->ipz_hca_handle, e_mr, &hipzout);
	if (h_ret != H_SUCCESS) {
		ehca_err(mr->device, "hipz_mr_query failed, h_ret=%lx mr=%p "
			 "hca_hndl=%lx mr_hndl=%lx lkey=%x",
			 h_ret, mr, shca->ipz_hca_handle.handle,
			 e_mr->ipz_mr_handle.handle, mr->lkey);
		ret = ehca2ib_return_code(h_ret);
		goto query_mr_exit1;
	}
	mr_attr->pd               = mr->pd;
	mr_attr->device_virt_addr = hipzout.vaddr;
	mr_attr->size             = hipzout.len;
	mr_attr->lkey             = hipzout.lkey;
	mr_attr->rkey             = hipzout.rkey;
	ehca_mrmw_reverse_map_acl(&hipzout.acl, &mr_attr->mr_access_flags);

query_mr_exit1:
	spin_unlock_irqrestore(&e_mr->mrlock, sl_flags);
query_mr_exit0:
	if (ret)
		ehca_err(mr->device, "ret=%x mr=%p mr_attr=%p",
			 ret, mr, mr_attr);
	return ret;
} /* end ehca_query_mr() */

/*----------------------------------------------------------------------*/

int ehca_dereg_mr(struct ib_mr *mr)
{
	int ret = 0;
	u64 h_ret;
	struct ehca_shca *shca =
		container_of(mr->device, struct ehca_shca, ib_device);
	struct ehca_mr *e_mr = container_of(mr, struct ehca_mr, ib.ib_mr);
	struct ehca_pd *my_pd = container_of(mr->pd, struct ehca_pd, ib_pd);
	u32 cur_pid = current->tgid;

	if (my_pd->ib_pd.uobject && my_pd->ib_pd.uobject->context &&
	    (my_pd->ownpid != cur_pid)) {
		ehca_err(mr->device, "Invalid caller pid=%x ownpid=%x",
			 cur_pid, my_pd->ownpid);
		ret = -EINVAL;
		goto dereg_mr_exit0;
	}

	if ((e_mr->flags & EHCA_MR_FLAG_FMR)) {
		ehca_err(mr->device, "not supported for FMR, mr=%p e_mr=%p "
			 "e_mr->flags=%x", mr, e_mr, e_mr->flags);
		ret = -EINVAL;
		goto dereg_mr_exit0;
	} else if (e_mr == shca->maxmr) {
		/* should be impossible, however reject to be sure */
		ehca_err(mr->device, "dereg internal max-MR impossible, mr=%p "
			 "shca->maxmr=%p mr->lkey=%x",
			 mr, shca->maxmr, mr->lkey);
		ret = -EINVAL;
		goto dereg_mr_exit0;
	}

	/* TODO: BUSY: MR still has bound window(s) */
	h_ret = hipz_h_free_resource_mr(shca->ipz_hca_handle, e_mr);
	if (h_ret != H_SUCCESS) {
		ehca_err(mr->device, "hipz_free_mr failed, h_ret=%lx shca=%p "
			 "e_mr=%p hca_hndl=%lx mr_hndl=%lx mr->lkey=%x",
			 h_ret, shca, e_mr, shca->ipz_hca_handle.handle,
			 e_mr->ipz_mr_handle.handle, mr->lkey);
		ret = ehca2ib_return_code(h_ret);
		goto dereg_mr_exit0;
	}

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

	/* successful deregistration */
	ehca_mr_delete(e_mr);

dereg_mr_exit0:
	if (ret)
		ehca_err(mr->device, "ret=%x mr=%p", ret, mr);
	return ret;
} /* end ehca_dereg_mr() */

/*----------------------------------------------------------------------*/

struct ib_mw *ehca_alloc_mw(struct ib_pd *pd)
{
	struct ib_mw *ib_mw;
	u64 h_ret;
	struct ehca_mw *e_mw;
	struct ehca_pd *e_pd = container_of(pd, struct ehca_pd, ib_pd);
	struct ehca_shca *shca =
		container_of(pd->device, struct ehca_shca, ib_device);
	struct ehca_mw_hipzout_parms hipzout = {{0},0};

	e_mw = ehca_mw_new();
	if (!e_mw) {
		ib_mw = ERR_PTR(-ENOMEM);
		goto alloc_mw_exit0;
	}

	h_ret = hipz_h_alloc_resource_mw(shca->ipz_hca_handle, e_mw,
					 e_pd->fw_pd, &hipzout);
	if (h_ret != H_SUCCESS) {
		ehca_err(pd->device, "hipz_mw_allocate failed, h_ret=%lx "
			 "shca=%p hca_hndl=%lx mw=%p",
			 h_ret, shca, shca->ipz_hca_handle.handle, e_mw);
		ib_mw = ERR_PTR(ehca2ib_return_code(h_ret));
		goto alloc_mw_exit1;
	}
	/* successful MW allocation */
	e_mw->ipz_mw_handle = hipzout.handle;
	e_mw->ib_mw.rkey    = hipzout.rkey;
	return &e_mw->ib_mw;

alloc_mw_exit1:
	ehca_mw_delete(e_mw);
alloc_mw_exit0:
	if (IS_ERR(ib_mw))
		ehca_err(pd->device, "rc=%lx pd=%p", PTR_ERR(ib_mw), pd);
	return ib_mw;
} /* end ehca_alloc_mw() */

/*----------------------------------------------------------------------*/

int ehca_bind_mw(struct ib_qp *qp,
		 struct ib_mw *mw,
		 struct ib_mw_bind *mw_bind)
{
	/* TODO: not supported up to now */
	ehca_gen_err("bind MW currently not supported by HCAD");

	return -EPERM;
} /* end ehca_bind_mw() */

/*----------------------------------------------------------------------*/

int ehca_dealloc_mw(struct ib_mw *mw)
{
	u64 h_ret;
	struct ehca_shca *shca =
		container_of(mw->device, struct ehca_shca, ib_device);
	struct ehca_mw *e_mw = container_of(mw, struct ehca_mw, ib_mw);

	h_ret = hipz_h_free_resource_mw(shca->ipz_hca_handle, e_mw);
	if (h_ret != H_SUCCESS) {
		ehca_err(mw->device, "hipz_free_mw failed, h_ret=%lx shca=%p "
			 "mw=%p rkey=%x hca_hndl=%lx mw_hndl=%lx",
			 h_ret, shca, mw, mw->rkey, shca->ipz_hca_handle.handle,
			 e_mw->ipz_mw_handle.handle);
		return ehca2ib_return_code(h_ret);
	}
	/* successful deallocation */
	ehca_mw_delete(e_mw);
	return 0;
} /* end ehca_dealloc_mw() */

/*----------------------------------------------------------------------*/

struct ib_fmr *ehca_alloc_fmr(struct ib_pd *pd,
			      int mr_access_flags,
			      struct ib_fmr_attr *fmr_attr)
{
	struct ib_fmr *ib_fmr;
	struct ehca_shca *shca =
		container_of(pd->device, struct ehca_shca, ib_device);
	struct ehca_pd *e_pd = container_of(pd, struct ehca_pd, ib_pd);
	struct ehca_mr *e_fmr;
	int ret;
	u32 tmp_lkey, tmp_rkey;
	struct ehca_mr_pginfo pginfo={0,0,0,0,0,0,0,NULL,0,NULL,NULL,0,NULL,0};

	/* check other parameters */
	if (((mr_access_flags & IB_ACCESS_REMOTE_WRITE) &&
	     !(mr_access_flags & IB_ACCESS_LOCAL_WRITE)) ||
	    ((mr_access_flags & IB_ACCESS_REMOTE_ATOMIC) &&
	     !(mr_access_flags & IB_ACCESS_LOCAL_WRITE))) {
		/*
		 * Remote Write Access requires Local Write Access
		 * Remote Atomic Access requires Local Write Access
		 */
		ehca_err(pd->device, "bad input values: mr_access_flags=%x",
			 mr_access_flags);
		ib_fmr = ERR_PTR(-EINVAL);
		goto alloc_fmr_exit0;
	}
	if (mr_access_flags & IB_ACCESS_MW_BIND) {
		ehca_err(pd->device, "bad input values: mr_access_flags=%x",
			 mr_access_flags);
		ib_fmr = ERR_PTR(-EINVAL);
		goto alloc_fmr_exit0;
	}
	if ((fmr_attr->max_pages == 0) || (fmr_attr->max_maps == 0)) {
		ehca_err(pd->device, "bad input values: fmr_attr->max_pages=%x "
			 "fmr_attr->max_maps=%x fmr_attr->page_shift=%x",
			 fmr_attr->max_pages, fmr_attr->max_maps,
			 fmr_attr->page_shift);
		ib_fmr = ERR_PTR(-EINVAL);
		goto alloc_fmr_exit0;
	}
	if (((1 << fmr_attr->page_shift) != EHCA_PAGESIZE) &&
	    ((1 << fmr_attr->page_shift) != PAGE_SIZE)) {
		ehca_err(pd->device, "unsupported fmr_attr->page_shift=%x",
			 fmr_attr->page_shift);
		ib_fmr = ERR_PTR(-EINVAL);
		goto alloc_fmr_exit0;
	}

	e_fmr = ehca_mr_new();
	if (!e_fmr) {
		ib_fmr = ERR_PTR(-ENOMEM);
		goto alloc_fmr_exit0;
	}
	e_fmr->flags |= EHCA_MR_FLAG_FMR;

	/* register MR on HCA */
	ret = ehca_reg_mr(shca, e_fmr, NULL,
			  fmr_attr->max_pages * (1 << fmr_attr->page_shift),
			  mr_access_flags, e_pd, &pginfo,
			  &tmp_lkey, &tmp_rkey);
	if (ret) {
		ib_fmr = ERR_PTR(ret);
		goto alloc_fmr_exit1;
	}

	/* successful */
	e_fmr->fmr_page_size = 1 << fmr_attr->page_shift;
	e_fmr->fmr_max_pages = fmr_attr->max_pages;
	e_fmr->fmr_max_maps = fmr_attr->max_maps;
	e_fmr->fmr_map_cnt = 0;
	return &e_fmr->ib.ib_fmr;

alloc_fmr_exit1:
	ehca_mr_delete(e_fmr);
alloc_fmr_exit0:
	if (IS_ERR(ib_fmr))
		ehca_err(pd->device, "rc=%lx pd=%p mr_access_flags=%x "
			 "fmr_attr=%p", PTR_ERR(ib_fmr), pd,
			 mr_access_flags, fmr_attr);
	return ib_fmr;
} /* end ehca_alloc_fmr() */

/*----------------------------------------------------------------------*/

int ehca_map_phys_fmr(struct ib_fmr *fmr,
		      u64 *page_list,
		      int list_len,
		      u64 iova)
{
	int ret;
	struct ehca_shca *shca =
		container_of(fmr->device, struct ehca_shca, ib_device);
	struct ehca_mr *e_fmr = container_of(fmr, struct ehca_mr, ib.ib_fmr);
	struct ehca_pd *e_pd = container_of(fmr->pd, struct ehca_pd, ib_pd);
	struct ehca_mr_pginfo pginfo={0,0,0,0,0,0,0,NULL,0,NULL,NULL,0,NULL,0};
	u32 tmp_lkey, tmp_rkey;

	if (!(e_fmr->flags & EHCA_MR_FLAG_FMR)) {
		ehca_err(fmr->device, "not a FMR, e_fmr=%p e_fmr->flags=%x",
			 e_fmr, e_fmr->flags);
		ret = -EINVAL;
		goto map_phys_fmr_exit0;
	}
	ret = ehca_fmr_check_page_list(e_fmr, page_list, list_len);
	if (ret)
		goto map_phys_fmr_exit0;
	if (iova % e_fmr->fmr_page_size) {
		/* only whole-numbered pages */
		ehca_err(fmr->device, "bad iova, iova=%lx fmr_page_size=%x",
			 iova, e_fmr->fmr_page_size);
		ret = -EINVAL;
		goto map_phys_fmr_exit0;
	}
	if (e_fmr->fmr_map_cnt >= e_fmr->fmr_max_maps) {
		/* HCAD does not limit the maps, however trace this anyway */
		ehca_info(fmr->device, "map limit exceeded, fmr=%p "
			  "e_fmr->fmr_map_cnt=%x e_fmr->fmr_max_maps=%x",
			  fmr, e_fmr->fmr_map_cnt, e_fmr->fmr_max_maps);
	}

	pginfo.type      = EHCA_MR_PGI_FMR;
	pginfo.num_pages = list_len;
	pginfo.num_4k    = list_len * (e_fmr->fmr_page_size / EHCA_PAGESIZE);
	pginfo.page_list = page_list;
	pginfo.next_4k   = ((iova & (e_fmr->fmr_page_size-1)) /
			    EHCA_PAGESIZE);

	ret = ehca_rereg_mr(shca, e_fmr, (u64*)iova,
			    list_len * e_fmr->fmr_page_size,
			    e_fmr->acl, e_pd, &pginfo, &tmp_lkey, &tmp_rkey);
	if (ret)
		goto map_phys_fmr_exit0;

	/* successful reregistration */
	e_fmr->fmr_map_cnt++;
	e_fmr->ib.ib_fmr.lkey = tmp_lkey;
	e_fmr->ib.ib_fmr.rkey = tmp_rkey;
	return 0;

map_phys_fmr_exit0:
	if (ret)
		ehca_err(fmr->device, "ret=%x fmr=%p page_list=%p list_len=%x "
			 "iova=%lx",
			 ret, fmr, page_list, list_len, iova);
	return ret;
} /* end ehca_map_phys_fmr() */

/*----------------------------------------------------------------------*/

int ehca_unmap_fmr(struct list_head *fmr_list)
{
	int ret = 0;
	struct ib_fmr *ib_fmr;
	struct ehca_shca *shca = NULL;
	struct ehca_shca *prev_shca;
	struct ehca_mr *e_fmr;
	u32 num_fmr = 0;
	u32 unmap_fmr_cnt = 0;

	/* check all FMR belong to same SHCA, and check internal flag */
	list_for_each_entry(ib_fmr, fmr_list, list) {
		prev_shca = shca;
		if (!ib_fmr) {
			ehca_gen_err("bad fmr=%p in list", ib_fmr);
			ret = -EINVAL;
			goto unmap_fmr_exit0;
		}
		shca = container_of(ib_fmr->device, struct ehca_shca,
				    ib_device);
		e_fmr = container_of(ib_fmr, struct ehca_mr, ib.ib_fmr);
		if ((shca != prev_shca) && prev_shca) {
			ehca_err(&shca->ib_device, "SHCA mismatch, shca=%p "
				 "prev_shca=%p e_fmr=%p",
				 shca, prev_shca, e_fmr);
			ret = -EINVAL;
			goto unmap_fmr_exit0;
		}
		if (!(e_fmr->flags & EHCA_MR_FLAG_FMR)) {
			ehca_err(&shca->ib_device, "not a FMR, e_fmr=%p "
				 "e_fmr->flags=%x", e_fmr, e_fmr->flags);
			ret = -EINVAL;
			goto unmap_fmr_exit0;
		}
		num_fmr++;
	}

	/* loop over all FMRs to unmap */
	list_for_each_entry(ib_fmr, fmr_list, list) {
		unmap_fmr_cnt++;
		e_fmr = container_of(ib_fmr, struct ehca_mr, ib.ib_fmr);
		shca = container_of(ib_fmr->device, struct ehca_shca,
				    ib_device);
		ret = ehca_unmap_one_fmr(shca, e_fmr);
		if (ret) {
			/* unmap failed, stop unmapping of rest of FMRs */
			ehca_err(&shca->ib_device, "unmap of one FMR failed, "
				 "stop rest, e_fmr=%p num_fmr=%x "
				 "unmap_fmr_cnt=%x lkey=%x", e_fmr, num_fmr,
				 unmap_fmr_cnt, e_fmr->ib.ib_fmr.lkey);
			goto unmap_fmr_exit0;
		}
	}

unmap_fmr_exit0:
	if (ret)
		ehca_gen_err("ret=%x fmr_list=%p num_fmr=%x unmap_fmr_cnt=%x",
			     ret, fmr_list, num_fmr, unmap_fmr_cnt);
	return ret;
} /* end ehca_unmap_fmr() */

/*----------------------------------------------------------------------*/

int ehca_dealloc_fmr(struct ib_fmr *fmr)
{
	int ret;
	u64 h_ret;
	struct ehca_shca *shca =
		container_of(fmr->device, struct ehca_shca, ib_device);
	struct ehca_mr *e_fmr = container_of(fmr, struct ehca_mr, ib.ib_fmr);

	if (!(e_fmr->flags & EHCA_MR_FLAG_FMR)) {
		ehca_err(fmr->device, "not a FMR, e_fmr=%p e_fmr->flags=%x",
			 e_fmr, e_fmr->flags);
		ret = -EINVAL;
		goto free_fmr_exit0;
	}

	h_ret = hipz_h_free_resource_mr(shca->ipz_hca_handle, e_fmr);
	if (h_ret != H_SUCCESS) {
		ehca_err(fmr->device, "hipz_free_mr failed, h_ret=%lx e_fmr=%p "
			 "hca_hndl=%lx fmr_hndl=%lx fmr->lkey=%x",
			 h_ret, e_fmr, shca->ipz_hca_handle.handle,
			 e_fmr->ipz_mr_handle.handle, fmr->lkey);
		ret = ehca2ib_return_code(h_ret);
		goto free_fmr_exit0;
	}
	/* successful deregistration */
	ehca_mr_delete(e_fmr);
	return 0;

free_fmr_exit0:
	if (ret)
		ehca_err(&shca->ib_device, "ret=%x fmr=%p", ret, fmr);
	return ret;
} /* end ehca_dealloc_fmr() */

/*----------------------------------------------------------------------*/

int ehca_reg_mr(struct ehca_shca *shca,
		struct ehca_mr *e_mr,
		u64 *iova_start,
		u64 size,
		int acl,
		struct ehca_pd *e_pd,
		struct ehca_mr_pginfo *pginfo,
		u32 *lkey, /*OUT*/
		u32 *rkey) /*OUT*/
{
	int ret;
	u64 h_ret;
	u32 hipz_acl;
	struct ehca_mr_hipzout_parms hipzout = {{0},0,0,0,0,0};

	ehca_mrmw_map_acl(acl, &hipz_acl);
	ehca_mrmw_set_pgsize_hipz_acl(&hipz_acl);
	if (ehca_use_hp_mr == 1)
	        hipz_acl |= 0x00000001;

	h_ret = hipz_h_alloc_resource_mr(shca->ipz_hca_handle, e_mr,
					 (u64)iova_start, size, hipz_acl,
					 e_pd->fw_pd, &hipzout);
	if (h_ret != H_SUCCESS) {
		ehca_err(&shca->ib_device, "hipz_alloc_mr failed, h_ret=%lx "
			 "hca_hndl=%lx", h_ret, shca->ipz_hca_handle.handle);
		ret = ehca2ib_return_code(h_ret);
		goto ehca_reg_mr_exit0;
	}

	e_mr->ipz_mr_handle = hipzout.handle;

	ret = ehca_reg_mr_rpages(shca, e_mr, pginfo);
	if (ret)
		goto ehca_reg_mr_exit1;

	/* successful registration */
	e_mr->num_pages = pginfo->num_pages;
	e_mr->num_4k    = pginfo->num_4k;
	e_mr->start     = iova_start;
	e_mr->size      = size;
	e_mr->acl       = acl;
	*lkey = hipzout.lkey;
	*rkey = hipzout.rkey;
	return 0;

ehca_reg_mr_exit1:
	h_ret = hipz_h_free_resource_mr(shca->ipz_hca_handle, e_mr);
	if (h_ret != H_SUCCESS) {
		ehca_err(&shca->ib_device, "h_ret=%lx shca=%p e_mr=%p "
			 "iova_start=%p size=%lx acl=%x e_pd=%p lkey=%x "
			 "pginfo=%p num_pages=%lx num_4k=%lx ret=%x",
			 h_ret, shca, e_mr, iova_start, size, acl, e_pd,
			 hipzout.lkey, pginfo, pginfo->num_pages,
			 pginfo->num_4k, ret);
		ehca_err(&shca->ib_device, "internal error in ehca_reg_mr, "
			 "not recoverable");
	}
ehca_reg_mr_exit0:
	if (ret)
		ehca_err(&shca->ib_device, "ret=%x shca=%p e_mr=%p "
			 "iova_start=%p size=%lx acl=%x e_pd=%p pginfo=%p "
			 "num_pages=%lx num_4k=%lx",
			 ret, shca, e_mr, iova_start, size, acl, e_pd, pginfo,
			 pginfo->num_pages, pginfo->num_4k);
	return ret;
} /* end ehca_reg_mr() */

/*----------------------------------------------------------------------*/

int ehca_reg_mr_rpages(struct ehca_shca *shca,
		       struct ehca_mr *e_mr,
		       struct ehca_mr_pginfo *pginfo)
{
	int ret = 0;
	u64 h_ret;
	u32 rnum;
	u64 rpage;
	u32 i;
	u64 *kpage;

	kpage = ehca_alloc_fw_ctrlblock(GFP_KERNEL);
	if (!kpage) {
		ehca_err(&shca->ib_device, "kpage alloc failed");
		ret = -ENOMEM;
		goto ehca_reg_mr_rpages_exit0;
	}

	/* max 512 pages per shot */
	for (i = 0; i < ((pginfo->num_4k + 512 - 1) / 512); i++) {

		if (i == ((pginfo->num_4k + 512 - 1) / 512) - 1) {
			rnum = pginfo->num_4k % 512; /* last shot */
			if (rnum == 0)
				rnum = 512;      /* last shot is full */
		} else
			rnum = 512;

		if (rnum > 1) {
			ret = ehca_set_pagebuf(e_mr, pginfo, rnum, kpage);
			if (ret) {
				ehca_err(&shca->ib_device, "ehca_set_pagebuf "
					 "bad rc, ret=%x rnum=%x kpage=%p",
					 ret, rnum, kpage);
				ret = -EFAULT;
				goto ehca_reg_mr_rpages_exit1;
			}
			rpage = virt_to_abs(kpage);
			if (!rpage) {
				ehca_err(&shca->ib_device, "kpage=%p i=%x",
					 kpage, i);
				ret = -EFAULT;
				goto ehca_reg_mr_rpages_exit1;
			}
		} else {  /* rnum==1 */
			ret = ehca_set_pagebuf_1(e_mr, pginfo, &rpage);
			if (ret) {
				ehca_err(&shca->ib_device, "ehca_set_pagebuf_1 "
					 "bad rc, ret=%x i=%x", ret, i);
				ret = -EFAULT;
				goto ehca_reg_mr_rpages_exit1;
			}
		}

		h_ret = hipz_h_register_rpage_mr(shca->ipz_hca_handle, e_mr,
						 0, /* pagesize 4k */
						 0, rpage, rnum);

		if (i == ((pginfo->num_4k + 512 - 1) / 512) - 1) {
			/*
			 * check for 'registration complete'==H_SUCCESS
			 * and for 'page registered'==H_PAGE_REGISTERED
			 */
			if (h_ret != H_SUCCESS) {
				ehca_err(&shca->ib_device, "last "
					 "hipz_reg_rpage_mr failed, h_ret=%lx "
					 "e_mr=%p i=%x hca_hndl=%lx mr_hndl=%lx"
					 " lkey=%x", h_ret, e_mr, i,
					 shca->ipz_hca_handle.handle,
					 e_mr->ipz_mr_handle.handle,
					 e_mr->ib.ib_mr.lkey);
				ret = ehca2ib_return_code(h_ret);
				break;
			} else
				ret = 0;
		} else if (h_ret != H_PAGE_REGISTERED) {
			ehca_err(&shca->ib_device, "hipz_reg_rpage_mr failed, "
				 "h_ret=%lx e_mr=%p i=%x lkey=%x hca_hndl=%lx "
				 "mr_hndl=%lx", h_ret, e_mr, i,
				 e_mr->ib.ib_mr.lkey,
				 shca->ipz_hca_handle.handle,
				 e_mr->ipz_mr_handle.handle);
			ret = ehca2ib_return_code(h_ret);
			break;
		} else
			ret = 0;
	} /* end for(i) */


ehca_reg_mr_rpages_exit1:
	ehca_free_fw_ctrlblock(kpage);
ehca_reg_mr_rpages_exit0:
	if (ret)
		ehca_err(&shca->ib_device, "ret=%x shca=%p e_mr=%p pginfo=%p "
			 "num_pages=%lx num_4k=%lx", ret, shca, e_mr, pginfo,
			 pginfo->num_pages, pginfo->num_4k);
	return ret;
} /* end ehca_reg_mr_rpages() */

/*----------------------------------------------------------------------*/

inline int ehca_rereg_mr_rereg1(struct ehca_shca *shca,
				struct ehca_mr *e_mr,
				u64 *iova_start,
				u64 size,
				u32 acl,
				struct ehca_pd *e_pd,
				struct ehca_mr_pginfo *pginfo,
				u32 *lkey, /*OUT*/
				u32 *rkey) /*OUT*/
{
	int ret;
	u64 h_ret;
	u32 hipz_acl;
	u64 *kpage;
	u64 rpage;
	struct ehca_mr_pginfo pginfo_save;
	struct ehca_mr_hipzout_parms hipzout = {{0},0,0,0,0,0};

	ehca_mrmw_map_acl(acl, &hipz_acl);
	ehca_mrmw_set_pgsize_hipz_acl(&hipz_acl);

	kpage = ehca_alloc_fw_ctrlblock(GFP_KERNEL);
	if (!kpage) {
		ehca_err(&shca->ib_device, "kpage alloc failed");
		ret = -ENOMEM;
		goto ehca_rereg_mr_rereg1_exit0;
	}

	pginfo_save = *pginfo;
	ret = ehca_set_pagebuf(e_mr, pginfo, pginfo->num_4k, kpage);
	if (ret) {
		ehca_err(&shca->ib_device, "set pagebuf failed, e_mr=%p "
			 "pginfo=%p type=%x num_pages=%lx num_4k=%lx kpage=%p",
			 e_mr, pginfo, pginfo->type, pginfo->num_pages,
			 pginfo->num_4k,kpage);
		goto ehca_rereg_mr_rereg1_exit1;
	}
	rpage = virt_to_abs(kpage);
	if (!rpage) {
		ehca_err(&shca->ib_device, "kpage=%p", kpage);
		ret = -EFAULT;
		goto ehca_rereg_mr_rereg1_exit1;
	}
	h_ret = hipz_h_reregister_pmr(shca->ipz_hca_handle, e_mr,
				      (u64)iova_start, size, hipz_acl,
				      e_pd->fw_pd, rpage, &hipzout);
	if (h_ret != H_SUCCESS) {
		/*
		 * reregistration unsuccessful, try it again with the 3 hCalls,
		 * e.g. this is required in case H_MR_CONDITION
		 * (MW bound or MR is shared)
		 */
		ehca_warn(&shca->ib_device, "hipz_h_reregister_pmr failed "
			  "(Rereg1), h_ret=%lx e_mr=%p", h_ret, e_mr);
		*pginfo = pginfo_save;
		ret = -EAGAIN;
	} else if ((u64*)hipzout.vaddr != iova_start) {
		ehca_err(&shca->ib_device, "PHYP changed iova_start in "
			 "rereg_pmr, iova_start=%p iova_start_out=%lx e_mr=%p "
			 "mr_handle=%lx lkey=%x lkey_out=%x", iova_start,
			 hipzout.vaddr, e_mr, e_mr->ipz_mr_handle.handle,
			 e_mr->ib.ib_mr.lkey, hipzout.lkey);
		ret = -EFAULT;
	} else {
		/*
		 * successful reregistration
		 * note: start and start_out are identical for eServer HCAs
		 */
		e_mr->num_pages = pginfo->num_pages;
		e_mr->num_4k    = pginfo->num_4k;
		e_mr->start     = iova_start;
		e_mr->size      = size;
		e_mr->acl       = acl;
		*lkey = hipzout.lkey;
		*rkey = hipzout.rkey;
	}

ehca_rereg_mr_rereg1_exit1:
	ehca_free_fw_ctrlblock(kpage);
ehca_rereg_mr_rereg1_exit0:
	if ( ret && (ret != -EAGAIN) )
		ehca_err(&shca->ib_device, "ret=%x lkey=%x rkey=%x "
			 "pginfo=%p num_pages=%lx num_4k=%lx",
			 ret, *lkey, *rkey, pginfo, pginfo->num_pages,
			 pginfo->num_4k);
	return ret;
} /* end ehca_rereg_mr_rereg1() */

/*----------------------------------------------------------------------*/

int ehca_rereg_mr(struct ehca_shca *shca,
		  struct ehca_mr *e_mr,
		  u64 *iova_start,
		  u64 size,
		  int acl,
		  struct ehca_pd *e_pd,
		  struct ehca_mr_pginfo *pginfo,
		  u32 *lkey,
		  u32 *rkey)
{
	int ret = 0;
	u64 h_ret;
	int rereg_1_hcall = 1; /* 1: use hipz_h_reregister_pmr directly */
	int rereg_3_hcall = 0; /* 1: use 3 hipz calls for reregistration */

	/* first determine reregistration hCall(s) */
	if ((pginfo->num_4k > 512) || (e_mr->num_4k > 512) ||
	    (pginfo->num_4k > e_mr->num_4k)) {
		ehca_dbg(&shca->ib_device, "Rereg3 case, pginfo->num_4k=%lx "
			 "e_mr->num_4k=%x", pginfo->num_4k, e_mr->num_4k);
		rereg_1_hcall = 0;
		rereg_3_hcall = 1;
	}

	if (e_mr->flags & EHCA_MR_FLAG_MAXMR) {	/* check for max-MR */
		rereg_1_hcall = 0;
		rereg_3_hcall = 1;
		e_mr->flags &= ~EHCA_MR_FLAG_MAXMR;
		ehca_err(&shca->ib_device, "Rereg MR for max-MR! e_mr=%p",
			 e_mr);
	}

	if (rereg_1_hcall) {
		ret = ehca_rereg_mr_rereg1(shca, e_mr, iova_start, size,
					   acl, e_pd, pginfo, lkey, rkey);
		if (ret) {
			if (ret == -EAGAIN)
				rereg_3_hcall = 1;
			else
				goto ehca_rereg_mr_exit0;
		}
	}

	if (rereg_3_hcall) {
		struct ehca_mr save_mr;

		/* first deregister old MR */
		h_ret = hipz_h_free_resource_mr(shca->ipz_hca_handle, e_mr);
		if (h_ret != H_SUCCESS) {
			ehca_err(&shca->ib_device, "hipz_free_mr failed, "
				 "h_ret=%lx e_mr=%p hca_hndl=%lx mr_hndl=%lx "
				 "mr->lkey=%x",
				 h_ret, e_mr, shca->ipz_hca_handle.handle,
				 e_mr->ipz_mr_handle.handle,
				 e_mr->ib.ib_mr.lkey);
			ret = ehca2ib_return_code(h_ret);
			goto ehca_rereg_mr_exit0;
		}
		/* clean ehca_mr_t, without changing struct ib_mr and lock */
		save_mr = *e_mr;
		ehca_mr_deletenew(e_mr);

		/* set some MR values */
		e_mr->flags = save_mr.flags;
		e_mr->fmr_page_size = save_mr.fmr_page_size;
		e_mr->fmr_max_pages = save_mr.fmr_max_pages;
		e_mr->fmr_max_maps = save_mr.fmr_max_maps;
		e_mr->fmr_map_cnt = save_mr.fmr_map_cnt;

		ret = ehca_reg_mr(shca, e_mr, iova_start, size, acl,
				      e_pd, pginfo, lkey, rkey);
		if (ret) {
			u32 offset = (u64)(&e_mr->flags) - (u64)e_mr;
			memcpy(&e_mr->flags, &(save_mr.flags),
			       sizeof(struct ehca_mr) - offset);
			goto ehca_rereg_mr_exit0;
		}
	}

ehca_rereg_mr_exit0:
	if (ret)
		ehca_err(&shca->ib_device, "ret=%x shca=%p e_mr=%p "
			 "iova_start=%p size=%lx acl=%x e_pd=%p pginfo=%p "
			 "num_pages=%lx lkey=%x rkey=%x rereg_1_hcall=%x "
			 "rereg_3_hcall=%x", ret, shca, e_mr, iova_start, size,
			 acl, e_pd, pginfo, pginfo->num_pages, *lkey, *rkey,
			 rereg_1_hcall, rereg_3_hcall);
	return ret;
} /* end ehca_rereg_mr() */

/*----------------------------------------------------------------------*/

int ehca_unmap_one_fmr(struct ehca_shca *shca,
		       struct ehca_mr *e_fmr)
{
	int ret = 0;
	u64 h_ret;
	int rereg_1_hcall = 1; /* 1: use hipz_mr_reregister directly */
	int rereg_3_hcall = 0; /* 1: use 3 hipz calls for unmapping */
	struct ehca_pd *e_pd =
		container_of(e_fmr->ib.ib_fmr.pd, struct ehca_pd, ib_pd);
	struct ehca_mr save_fmr;
	u32 tmp_lkey, tmp_rkey;
	struct ehca_mr_pginfo pginfo={0,0,0,0,0,0,0,NULL,0,NULL,NULL,0,NULL,0};
	struct ehca_mr_hipzout_parms hipzout = {{0},0,0,0,0,0};

	/* first check if reregistration hCall can be used for unmap */
	if (e_fmr->fmr_max_pages > 512) {
		rereg_1_hcall = 0;
		rereg_3_hcall = 1;
	}

	if (rereg_1_hcall) {
		/*
		 * note: after using rereg hcall with len=0,
		 * rereg hcall must be used again for registering pages
		 */
		h_ret = hipz_h_reregister_pmr(shca->ipz_hca_handle, e_fmr, 0,
					      0, 0, e_pd->fw_pd, 0, &hipzout);
		if (h_ret != H_SUCCESS) {
			/*
			 * should not happen, because length checked above,
			 * FMRs are not shared and no MW bound to FMRs
			 */
			ehca_err(&shca->ib_device, "hipz_reregister_pmr failed "
				 "(Rereg1), h_ret=%lx e_fmr=%p hca_hndl=%lx "
				 "mr_hndl=%lx lkey=%x lkey_out=%x",
				 h_ret, e_fmr, shca->ipz_hca_handle.handle,
				 e_fmr->ipz_mr_handle.handle,
				 e_fmr->ib.ib_fmr.lkey, hipzout.lkey);
			rereg_3_hcall = 1;
		} else {
			/* successful reregistration */
			e_fmr->start = NULL;
			e_fmr->size = 0;
			tmp_lkey = hipzout.lkey;
			tmp_rkey = hipzout.rkey;
		}
	}

	if (rereg_3_hcall) {
		struct ehca_mr save_mr;

		/* first free old FMR */
		h_ret = hipz_h_free_resource_mr(shca->ipz_hca_handle, e_fmr);
		if (h_ret != H_SUCCESS) {
			ehca_err(&shca->ib_device, "hipz_free_mr failed, "
				 "h_ret=%lx e_fmr=%p hca_hndl=%lx mr_hndl=%lx "
				 "lkey=%x",
				 h_ret, e_fmr, shca->ipz_hca_handle.handle,
				 e_fmr->ipz_mr_handle.handle,
				 e_fmr->ib.ib_fmr.lkey);
			ret = ehca2ib_return_code(h_ret);
			goto ehca_unmap_one_fmr_exit0;
		}
		/* clean ehca_mr_t, without changing lock */
		save_fmr = *e_fmr;
		ehca_mr_deletenew(e_fmr);

		/* set some MR values */
		e_fmr->flags = save_fmr.flags;
		e_fmr->fmr_page_size = save_fmr.fmr_page_size;
		e_fmr->fmr_max_pages = save_fmr.fmr_max_pages;
		e_fmr->fmr_max_maps = save_fmr.fmr_max_maps;
		e_fmr->fmr_map_cnt = save_fmr.fmr_map_cnt;
		e_fmr->acl = save_fmr.acl;

		pginfo.type      = EHCA_MR_PGI_FMR;
		pginfo.num_pages = 0;
		pginfo.num_4k    = 0;
		ret = ehca_reg_mr(shca, e_fmr, NULL,
				  (e_fmr->fmr_max_pages * e_fmr->fmr_page_size),
				  e_fmr->acl, e_pd, &pginfo, &tmp_lkey,
				  &tmp_rkey);
		if (ret) {
			u32 offset = (u64)(&e_fmr->flags) - (u64)e_fmr;
			memcpy(&e_fmr->flags, &(save_mr.flags),
			       sizeof(struct ehca_mr) - offset);
			goto ehca_unmap_one_fmr_exit0;
		}
	}

ehca_unmap_one_fmr_exit0:
	if (ret)
		ehca_err(&shca->ib_device, "ret=%x tmp_lkey=%x tmp_rkey=%x "
			 "fmr_max_pages=%x rereg_1_hcall=%x rereg_3_hcall=%x",
			 ret, tmp_lkey, tmp_rkey, e_fmr->fmr_max_pages,
			 rereg_1_hcall, rereg_3_hcall);
	return ret;
} /* end ehca_unmap_one_fmr() */

/*----------------------------------------------------------------------*/

int ehca_reg_smr(struct ehca_shca *shca,
		 struct ehca_mr *e_origmr,
		 struct ehca_mr *e_newmr,
		 u64 *iova_start,
		 int acl,
		 struct ehca_pd *e_pd,
		 u32 *lkey, /*OUT*/
		 u32 *rkey) /*OUT*/
{
	int ret = 0;
	u64 h_ret;
	u32 hipz_acl;
	struct ehca_mr_hipzout_parms hipzout = {{0},0,0,0,0,0};

	ehca_mrmw_map_acl(acl, &hipz_acl);
	ehca_mrmw_set_pgsize_hipz_acl(&hipz_acl);

	h_ret = hipz_h_register_smr(shca->ipz_hca_handle, e_newmr, e_origmr,
				    (u64)iova_start, hipz_acl, e_pd->fw_pd,
				    &hipzout);
	if (h_ret != H_SUCCESS) {
		ehca_err(&shca->ib_device, "hipz_reg_smr failed, h_ret=%lx "
			 "shca=%p e_origmr=%p e_newmr=%p iova_start=%p acl=%x "
			 "e_pd=%p hca_hndl=%lx mr_hndl=%lx lkey=%x",
			 h_ret, shca, e_origmr, e_newmr, iova_start, acl, e_pd,
			 shca->ipz_hca_handle.handle,
			 e_origmr->ipz_mr_handle.handle,
			 e_origmr->ib.ib_mr.lkey);
		ret = ehca2ib_return_code(h_ret);
		goto ehca_reg_smr_exit0;
	}
	/* successful registration */
	e_newmr->num_pages     = e_origmr->num_pages;
	e_newmr->num_4k        = e_origmr->num_4k;
	e_newmr->start         = iova_start;
	e_newmr->size          = e_origmr->size;
	e_newmr->acl           = acl;
	e_newmr->ipz_mr_handle = hipzout.handle;
	*lkey = hipzout.lkey;
	*rkey = hipzout.rkey;
	return 0;

ehca_reg_smr_exit0:
	if (ret)
		ehca_err(&shca->ib_device, "ret=%x shca=%p e_origmr=%p "
			 "e_newmr=%p iova_start=%p acl=%x e_pd=%p",
			 ret, shca, e_origmr, e_newmr, iova_start, acl, e_pd);
	return ret;
} /* end ehca_reg_smr() */

/*----------------------------------------------------------------------*/

/* register internal max-MR to internal SHCA */
int ehca_reg_internal_maxmr(
	struct ehca_shca *shca,
	struct ehca_pd *e_pd,
	struct ehca_mr **e_maxmr)  /*OUT*/
{
	int ret;
	struct ehca_mr *e_mr;
	u64 *iova_start;
	u64 size_maxmr;
	struct ehca_mr_pginfo pginfo={0,0,0,0,0,0,0,NULL,0,NULL,NULL,0,NULL,0};
	struct ib_phys_buf ib_pbuf;
	u32 num_pages_mr;
	u32 num_pages_4k; /* 4k portion "pages" */

	e_mr = ehca_mr_new();
	if (!e_mr) {
		ehca_err(&shca->ib_device, "out of memory");
		ret = -ENOMEM;
		goto ehca_reg_internal_maxmr_exit0;
	}
	e_mr->flags |= EHCA_MR_FLAG_MAXMR;

	/* register internal max-MR on HCA */
	size_maxmr = (u64)high_memory - PAGE_OFFSET;
	iova_start = (u64*)KERNELBASE;
	ib_pbuf.addr = 0;
	ib_pbuf.size = size_maxmr;
	num_pages_mr = ((((u64)iova_start % PAGE_SIZE) + size_maxmr +
			 PAGE_SIZE - 1) / PAGE_SIZE);
	num_pages_4k = ((((u64)iova_start % EHCA_PAGESIZE) + size_maxmr +
			 EHCA_PAGESIZE - 1) / EHCA_PAGESIZE);

	pginfo.type           = EHCA_MR_PGI_PHYS;
	pginfo.num_pages      = num_pages_mr;
	pginfo.num_4k         = num_pages_4k;
	pginfo.num_phys_buf   = 1;
	pginfo.phys_buf_array = &ib_pbuf;

	ret = ehca_reg_mr(shca, e_mr, iova_start, size_maxmr, 0, e_pd,
			  &pginfo, &e_mr->ib.ib_mr.lkey,
			  &e_mr->ib.ib_mr.rkey);
	if (ret) {
		ehca_err(&shca->ib_device, "reg of internal max MR failed, "
			 "e_mr=%p iova_start=%p size_maxmr=%lx num_pages_mr=%x "
			 "num_pages_4k=%x", e_mr, iova_start, size_maxmr,
			 num_pages_mr, num_pages_4k);
		goto ehca_reg_internal_maxmr_exit1;
	}

	/* successful registration of all pages */
	e_mr->ib.ib_mr.device = e_pd->ib_pd.device;
	e_mr->ib.ib_mr.pd = &e_pd->ib_pd;
	e_mr->ib.ib_mr.uobject = NULL;
	atomic_inc(&(e_pd->ib_pd.usecnt));
	atomic_set(&(e_mr->ib.ib_mr.usecnt), 0);
	*e_maxmr = e_mr;
	return 0;

ehca_reg_internal_maxmr_exit1:
	ehca_mr_delete(e_mr);
ehca_reg_internal_maxmr_exit0:
	if (ret)
		ehca_err(&shca->ib_device, "ret=%x shca=%p e_pd=%p e_maxmr=%p",
			 ret, shca, e_pd, e_maxmr);
	return ret;
} /* end ehca_reg_internal_maxmr() */

/*----------------------------------------------------------------------*/

int ehca_reg_maxmr(struct ehca_shca *shca,
		   struct ehca_mr *e_newmr,
		   u64 *iova_start,
		   int acl,
		   struct ehca_pd *e_pd,
		   u32 *lkey,
		   u32 *rkey)
{
	u64 h_ret;
	struct ehca_mr *e_origmr = shca->maxmr;
	u32 hipz_acl;
	struct ehca_mr_hipzout_parms hipzout = {{0},0,0,0,0,0};

	ehca_mrmw_map_acl(acl, &hipz_acl);
	ehca_mrmw_set_pgsize_hipz_acl(&hipz_acl);

	h_ret = hipz_h_register_smr(shca->ipz_hca_handle, e_newmr, e_origmr,
				    (u64)iova_start, hipz_acl, e_pd->fw_pd,
				    &hipzout);
	if (h_ret != H_SUCCESS) {
		ehca_err(&shca->ib_device, "hipz_reg_smr failed, h_ret=%lx "
			 "e_origmr=%p hca_hndl=%lx mr_hndl=%lx lkey=%x",
			 h_ret, e_origmr, shca->ipz_hca_handle.handle,
			 e_origmr->ipz_mr_handle.handle,
			 e_origmr->ib.ib_mr.lkey);
		return ehca2ib_return_code(h_ret);
	}
	/* successful registration */
	e_newmr->num_pages     = e_origmr->num_pages;
	e_newmr->num_4k        = e_origmr->num_4k;
	e_newmr->start         = iova_start;
	e_newmr->size          = e_origmr->size;
	e_newmr->acl           = acl;
	e_newmr->ipz_mr_handle = hipzout.handle;
	*lkey = hipzout.lkey;
	*rkey = hipzout.rkey;
	return 0;
} /* end ehca_reg_maxmr() */

/*----------------------------------------------------------------------*/

int ehca_dereg_internal_maxmr(struct ehca_shca *shca)
{
	int ret;
	struct ehca_mr *e_maxmr;
	struct ib_pd *ib_pd;

	if (!shca->maxmr) {
		ehca_err(&shca->ib_device, "bad call, shca=%p", shca);
		ret = -EINVAL;
		goto ehca_dereg_internal_maxmr_exit0;
	}

	e_maxmr = shca->maxmr;
	ib_pd = e_maxmr->ib.ib_mr.pd;
	shca->maxmr = NULL; /* remove internal max-MR indication from SHCA */

	ret = ehca_dereg_mr(&e_maxmr->ib.ib_mr);
	if (ret) {
		ehca_err(&shca->ib_device, "dereg internal max-MR failed, "
			 "ret=%x e_maxmr=%p shca=%p lkey=%x",
			 ret, e_maxmr, shca, e_maxmr->ib.ib_mr.lkey);
		shca->maxmr = e_maxmr;
		goto ehca_dereg_internal_maxmr_exit0;
	}

	atomic_dec(&ib_pd->usecnt);

ehca_dereg_internal_maxmr_exit0:
	if (ret)
		ehca_err(&shca->ib_device, "ret=%x shca=%p shca->maxmr=%p",
			 ret, shca, shca->maxmr);
	return ret;
} /* end ehca_dereg_internal_maxmr() */

/*----------------------------------------------------------------------*/

/*
 * check physical buffer array of MR verbs for validness and
 * calculates MR size
 */
int ehca_mr_chk_buf_and_calc_size(struct ib_phys_buf *phys_buf_array,
				  int num_phys_buf,
				  u64 *iova_start,
				  u64 *size)
{
	struct ib_phys_buf *pbuf = phys_buf_array;
	u64 size_count = 0;
	u32 i;

	if (num_phys_buf == 0) {
		ehca_gen_err("bad phys buf array len, num_phys_buf=0");
		return -EINVAL;
	}
	/* check first buffer */
	if (((u64)iova_start & ~PAGE_MASK) != (pbuf->addr & ~PAGE_MASK)) {
		ehca_gen_err("iova_start/addr mismatch, iova_start=%p "
			     "pbuf->addr=%lx pbuf->size=%lx",
			     iova_start, pbuf->addr, pbuf->size);
		return -EINVAL;
	}
	if (((pbuf->addr + pbuf->size) % PAGE_SIZE) &&
	    (num_phys_buf > 1)) {
		ehca_gen_err("addr/size mismatch in 1st buf, pbuf->addr=%lx "
			     "pbuf->size=%lx", pbuf->addr, pbuf->size);
		return -EINVAL;
	}

	for (i = 0; i < num_phys_buf; i++) {
		if ((i > 0) && (pbuf->addr % PAGE_SIZE)) {
			ehca_gen_err("bad address, i=%x pbuf->addr=%lx "
				     "pbuf->size=%lx",
				     i, pbuf->addr, pbuf->size);
			return -EINVAL;
		}
		if (((i > 0) &&	/* not 1st */
		     (i < (num_phys_buf - 1)) &&	/* not last */
		     (pbuf->size % PAGE_SIZE)) || (pbuf->size == 0)) {
			ehca_gen_err("bad size, i=%x pbuf->size=%lx",
				     i, pbuf->size);
			return -EINVAL;
		}
		size_count += pbuf->size;
		pbuf++;
	}

	*size = size_count;
	return 0;
} /* end ehca_mr_chk_buf_and_calc_size() */

/*----------------------------------------------------------------------*/

/* check page list of map FMR verb for validness */
int ehca_fmr_check_page_list(struct ehca_mr *e_fmr,
			     u64 *page_list,
			     int list_len)
{
	u32 i;
	u64 *page;

	if ((list_len == 0) || (list_len > e_fmr->fmr_max_pages)) {
		ehca_gen_err("bad list_len, list_len=%x "
			     "e_fmr->fmr_max_pages=%x fmr=%p",
			     list_len, e_fmr->fmr_max_pages, e_fmr);
		return -EINVAL;
	}

	/* each page must be aligned */
	page = page_list;
	for (i = 0; i < list_len; i++) {
		if (*page % e_fmr->fmr_page_size) {
			ehca_gen_err("bad page, i=%x *page=%lx page=%p fmr=%p "
				     "fmr_page_size=%x", i, *page, page, e_fmr,
				     e_fmr->fmr_page_size);
			return -EINVAL;
		}
		page++;
	}

	return 0;
} /* end ehca_fmr_check_page_list() */

/*----------------------------------------------------------------------*/

/* setup page buffer from page info */
int ehca_set_pagebuf(struct ehca_mr *e_mr,
		     struct ehca_mr_pginfo *pginfo,
		     u32 number,
		     u64 *kpage)
{
	int ret = 0;
	struct ib_umem_chunk *prev_chunk;
	struct ib_umem_chunk *chunk;
	struct ib_phys_buf *pbuf;
	u64 *fmrlist;
	u64 num4k, pgaddr, offs4k;
	u32 i = 0;
	u32 j = 0;

	if (pginfo->type == EHCA_MR_PGI_PHYS) {
		/* loop over desired phys_buf_array entries */
		while (i < number) {
			pbuf   = pginfo->phys_buf_array + pginfo->next_buf;
			num4k  = ((pbuf->addr % EHCA_PAGESIZE) + pbuf->size +
				  EHCA_PAGESIZE - 1) / EHCA_PAGESIZE;
			offs4k = (pbuf->addr & ~PAGE_MASK) / EHCA_PAGESIZE;
			while (pginfo->next_4k < offs4k + num4k) {
				/* sanity check */
				if ((pginfo->page_cnt >= pginfo->num_pages) ||
				    (pginfo->page_4k_cnt >= pginfo->num_4k)) {
					ehca_gen_err("page_cnt >= num_pages, "
						     "page_cnt=%lx "
						     "num_pages=%lx "
						     "page_4k_cnt=%lx "
						     "num_4k=%lx i=%x",
						     pginfo->page_cnt,
						     pginfo->num_pages,
						     pginfo->page_4k_cnt,
						     pginfo->num_4k, i);
					ret = -EFAULT;
					goto ehca_set_pagebuf_exit0;
				}
				*kpage = phys_to_abs(
					(pbuf->addr & EHCA_PAGEMASK)
					+ (pginfo->next_4k * EHCA_PAGESIZE));
				if ( !(*kpage) && pbuf->addr ) {
					ehca_gen_err("pbuf->addr=%lx "
						     "pbuf->size=%lx "
						     "next_4k=%lx", pbuf->addr,
						     pbuf->size,
						     pginfo->next_4k);
					ret = -EFAULT;
					goto ehca_set_pagebuf_exit0;
				}
				(pginfo->page_4k_cnt)++;
				(pginfo->next_4k)++;
				if (pginfo->next_4k %
				    (PAGE_SIZE / EHCA_PAGESIZE) == 0)
					(pginfo->page_cnt)++;
				kpage++;
				i++;
				if (i >= number) break;
			}
			if (pginfo->next_4k >= offs4k + num4k) {
				(pginfo->next_buf)++;
				pginfo->next_4k = 0;
			}
		}
	} else if (pginfo->type == EHCA_MR_PGI_USER) {
		/* loop over desired chunk entries */
		chunk      = pginfo->next_chunk;
		prev_chunk = pginfo->next_chunk;
		list_for_each_entry_continue(chunk,
					     (&(pginfo->region->chunk_list)),
					     list) {
			for (i = pginfo->next_nmap; i < chunk->nmap; ) {
				pgaddr = ( page_to_pfn(chunk->page_list[i].page)
					   << PAGE_SHIFT );
				*kpage = phys_to_abs(pgaddr +
						     (pginfo->next_4k *
						      EHCA_PAGESIZE));
				if ( !(*kpage) ) {
					ehca_gen_err("pgaddr=%lx "
						     "chunk->page_list[i]=%lx "
						     "i=%x next_4k=%lx mr=%p",
						     pgaddr,
						     (u64)sg_dma_address(
							     &chunk->
							     page_list[i]),
						     i, pginfo->next_4k, e_mr);
					ret = -EFAULT;
					goto ehca_set_pagebuf_exit0;
				}
				(pginfo->page_4k_cnt)++;
				(pginfo->next_4k)++;
				kpage++;
				if (pginfo->next_4k %
				    (PAGE_SIZE / EHCA_PAGESIZE) == 0) {
					(pginfo->page_cnt)++;
					(pginfo->next_nmap)++;
					pginfo->next_4k = 0;
					i++;
				}
				j++;
				if (j >= number) break;
			}
			if ((pginfo->next_nmap >= chunk->nmap) &&
			    (j >= number)) {
				pginfo->next_nmap = 0;
				prev_chunk = chunk;
				break;
			} else if (pginfo->next_nmap >= chunk->nmap) {
				pginfo->next_nmap = 0;
				prev_chunk = chunk;
			} else if (j >= number)
				break;
			else
				prev_chunk = chunk;
		}
		pginfo->next_chunk =
			list_prepare_entry(prev_chunk,
					   (&(pginfo->region->chunk_list)),
					   list);
	} else if (pginfo->type == EHCA_MR_PGI_FMR) {
		/* loop over desired page_list entries */
		fmrlist = pginfo->page_list + pginfo->next_listelem;
		for (i = 0; i < number; i++) {
			*kpage = phys_to_abs((*fmrlist & EHCA_PAGEMASK) +
					     pginfo->next_4k * EHCA_PAGESIZE);
			if ( !(*kpage) ) {
				ehca_gen_err("*fmrlist=%lx fmrlist=%p "
					     "next_listelem=%lx next_4k=%lx",
					     *fmrlist, fmrlist,
					     pginfo->next_listelem,
					     pginfo->next_4k);
				ret = -EFAULT;
				goto ehca_set_pagebuf_exit0;
			}
			(pginfo->page_4k_cnt)++;
			(pginfo->next_4k)++;
			kpage++;
			if (pginfo->next_4k %
			    (e_mr->fmr_page_size / EHCA_PAGESIZE) == 0) {
				(pginfo->page_cnt)++;
				(pginfo->next_listelem)++;
				fmrlist++;
				pginfo->next_4k = 0;
			}
		}
	} else {
		ehca_gen_err("bad pginfo->type=%x", pginfo->type);
		ret = -EFAULT;
		goto ehca_set_pagebuf_exit0;
	}

ehca_set_pagebuf_exit0:
	if (ret)
		ehca_gen_err("ret=%x e_mr=%p pginfo=%p type=%x num_pages=%lx "
			     "num_4k=%lx next_buf=%lx next_4k=%lx number=%x "
			     "kpage=%p page_cnt=%lx page_4k_cnt=%lx i=%x "
			     "next_listelem=%lx region=%p next_chunk=%p "
			     "next_nmap=%lx", ret, e_mr, pginfo, pginfo->type,
			     pginfo->num_pages, pginfo->num_4k,
			     pginfo->next_buf, pginfo->next_4k, number, kpage,
			     pginfo->page_cnt, pginfo->page_4k_cnt, i,
			     pginfo->next_listelem, pginfo->region,
			     pginfo->next_chunk, pginfo->next_nmap);
	return ret;
} /* end ehca_set_pagebuf() */

/*----------------------------------------------------------------------*/

/* setup 1 page from page info page buffer */
int ehca_set_pagebuf_1(struct ehca_mr *e_mr,
		       struct ehca_mr_pginfo *pginfo,
		       u64 *rpage)
{
	int ret = 0;
	struct ib_phys_buf *tmp_pbuf;
	u64 *fmrlist;
	struct ib_umem_chunk *chunk;
	struct ib_umem_chunk *prev_chunk;
	u64 pgaddr, num4k, offs4k;

	if (pginfo->type == EHCA_MR_PGI_PHYS) {
		/* sanity check */
		if ((pginfo->page_cnt >= pginfo->num_pages) ||
		    (pginfo->page_4k_cnt >= pginfo->num_4k)) {
			ehca_gen_err("page_cnt >= num_pages, page_cnt=%lx "
				     "num_pages=%lx page_4k_cnt=%lx num_4k=%lx",
				     pginfo->page_cnt, pginfo->num_pages,
				     pginfo->page_4k_cnt, pginfo->num_4k);
			ret = -EFAULT;
			goto ehca_set_pagebuf_1_exit0;
		}
		tmp_pbuf = pginfo->phys_buf_array + pginfo->next_buf;
		num4k  = ((tmp_pbuf->addr % EHCA_PAGESIZE) + tmp_pbuf->size +
			  EHCA_PAGESIZE - 1) / EHCA_PAGESIZE;
		offs4k = (tmp_pbuf->addr & ~PAGE_MASK) / EHCA_PAGESIZE;
		*rpage = phys_to_abs((tmp_pbuf->addr & EHCA_PAGEMASK) +
				     (pginfo->next_4k * EHCA_PAGESIZE));
		if ( !(*rpage) && tmp_pbuf->addr ) {
			ehca_gen_err("tmp_pbuf->addr=%lx"
				     " tmp_pbuf->size=%lx next_4k=%lx",
				     tmp_pbuf->addr, tmp_pbuf->size,
				     pginfo->next_4k);
			ret = -EFAULT;
			goto ehca_set_pagebuf_1_exit0;
		}
		(pginfo->page_4k_cnt)++;
		(pginfo->next_4k)++;
		if (pginfo->next_4k % (PAGE_SIZE / EHCA_PAGESIZE) == 0)
			(pginfo->page_cnt)++;
		if (pginfo->next_4k >= offs4k + num4k) {
			(pginfo->next_buf)++;
			pginfo->next_4k = 0;
		}
	} else if (pginfo->type == EHCA_MR_PGI_USER) {
		chunk      = pginfo->next_chunk;
		prev_chunk = pginfo->next_chunk;
		list_for_each_entry_continue(chunk,
					     (&(pginfo->region->chunk_list)),
					     list) {
			pgaddr = ( page_to_pfn(chunk->page_list[
						       pginfo->next_nmap].page)
				   << PAGE_SHIFT);
			*rpage = phys_to_abs(pgaddr +
					     (pginfo->next_4k * EHCA_PAGESIZE));
			if ( !(*rpage) ) {
				ehca_gen_err("pgaddr=%lx chunk->page_list[]=%lx"
					     " next_nmap=%lx next_4k=%lx mr=%p",
					     pgaddr, (u64)sg_dma_address(
						     &chunk->page_list[
							     pginfo->
							     next_nmap]),
					     pginfo->next_nmap, pginfo->next_4k,
					     e_mr);
				ret = -EFAULT;
				goto ehca_set_pagebuf_1_exit0;
			}
			(pginfo->page_4k_cnt)++;
			(pginfo->next_4k)++;
			if (pginfo->next_4k %
			    (PAGE_SIZE / EHCA_PAGESIZE) == 0) {
				(pginfo->page_cnt)++;
				(pginfo->next_nmap)++;
				pginfo->next_4k = 0;
			}
			if (pginfo->next_nmap >= chunk->nmap) {
				pginfo->next_nmap = 0;
				prev_chunk = chunk;
			}
			break;
		}
		pginfo->next_chunk =
			list_prepare_entry(prev_chunk,
					   (&(pginfo->region->chunk_list)),
					   list);
	} else if (pginfo->type == EHCA_MR_PGI_FMR) {
		fmrlist = pginfo->page_list + pginfo->next_listelem;
		*rpage = phys_to_abs((*fmrlist & EHCA_PAGEMASK) +
				     pginfo->next_4k * EHCA_PAGESIZE);
		if ( !(*rpage) ) {
			ehca_gen_err("*fmrlist=%lx fmrlist=%p "
				     "next_listelem=%lx next_4k=%lx",
				     *fmrlist, fmrlist, pginfo->next_listelem,
				     pginfo->next_4k);
			ret = -EFAULT;
			goto ehca_set_pagebuf_1_exit0;
		}
		(pginfo->page_4k_cnt)++;
		(pginfo->next_4k)++;
		if (pginfo->next_4k %
		    (e_mr->fmr_page_size / EHCA_PAGESIZE) == 0) {
			(pginfo->page_cnt)++;
			(pginfo->next_listelem)++;
			pginfo->next_4k = 0;
		}
	} else {
		ehca_gen_err("bad pginfo->type=%x", pginfo->type);
		ret = -EFAULT;
		goto ehca_set_pagebuf_1_exit0;
	}

ehca_set_pagebuf_1_exit0:
	if (ret)
		ehca_gen_err("ret=%x e_mr=%p pginfo=%p type=%x num_pages=%lx "
			     "num_4k=%lx next_buf=%lx next_4k=%lx rpage=%p "
			     "page_cnt=%lx page_4k_cnt=%lx next_listelem=%lx "
			     "region=%p next_chunk=%p next_nmap=%lx", ret, e_mr,
			     pginfo, pginfo->type, pginfo->num_pages,
			     pginfo->num_4k, pginfo->next_buf, pginfo->next_4k,
			     rpage, pginfo->page_cnt, pginfo->page_4k_cnt,
			     pginfo->next_listelem, pginfo->region,
			     pginfo->next_chunk, pginfo->next_nmap);
	return ret;
} /* end ehca_set_pagebuf_1() */

/*----------------------------------------------------------------------*/

/*
 * check MR if it is a max-MR, i.e. uses whole memory
 * in case it's a max-MR 1 is returned, else 0
 */
int ehca_mr_is_maxmr(u64 size,
		     u64 *iova_start)
{
	/* a MR is treated as max-MR only if it fits following: */
	if ((size == ((u64)high_memory - PAGE_OFFSET)) &&
	    (iova_start == (void*)KERNELBASE)) {
		ehca_gen_dbg("this is a max-MR");
		return 1;
	} else
		return 0;
} /* end ehca_mr_is_maxmr() */

/*----------------------------------------------------------------------*/

/* map access control for MR/MW. This routine is used for MR and MW. */
void ehca_mrmw_map_acl(int ib_acl,
		       u32 *hipz_acl)
{
	*hipz_acl = 0;
	if (ib_acl & IB_ACCESS_REMOTE_READ)
		*hipz_acl |= HIPZ_ACCESSCTRL_R_READ;
	if (ib_acl & IB_ACCESS_REMOTE_WRITE)
		*hipz_acl |= HIPZ_ACCESSCTRL_R_WRITE;
	if (ib_acl & IB_ACCESS_REMOTE_ATOMIC)
		*hipz_acl |= HIPZ_ACCESSCTRL_R_ATOMIC;
	if (ib_acl & IB_ACCESS_LOCAL_WRITE)
		*hipz_acl |= HIPZ_ACCESSCTRL_L_WRITE;
	if (ib_acl & IB_ACCESS_MW_BIND)
		*hipz_acl |= HIPZ_ACCESSCTRL_MW_BIND;
} /* end ehca_mrmw_map_acl() */

/*----------------------------------------------------------------------*/

/* sets page size in hipz access control for MR/MW. */
void ehca_mrmw_set_pgsize_hipz_acl(u32 *hipz_acl) /*INOUT*/
{
	return; /* HCA supports only 4k */
} /* end ehca_mrmw_set_pgsize_hipz_acl() */

/*----------------------------------------------------------------------*/

/*
 * reverse map access control for MR/MW.
 * This routine is used for MR and MW.
 */
void ehca_mrmw_reverse_map_acl(const u32 *hipz_acl,
			       int *ib_acl) /*OUT*/
{
	*ib_acl = 0;
	if (*hipz_acl & HIPZ_ACCESSCTRL_R_READ)
		*ib_acl |= IB_ACCESS_REMOTE_READ;
	if (*hipz_acl & HIPZ_ACCESSCTRL_R_WRITE)
		*ib_acl |= IB_ACCESS_REMOTE_WRITE;
	if (*hipz_acl & HIPZ_ACCESSCTRL_R_ATOMIC)
		*ib_acl |= IB_ACCESS_REMOTE_ATOMIC;
	if (*hipz_acl & HIPZ_ACCESSCTRL_L_WRITE)
		*ib_acl |= IB_ACCESS_LOCAL_WRITE;
	if (*hipz_acl & HIPZ_ACCESSCTRL_MW_BIND)
		*ib_acl |= IB_ACCESS_MW_BIND;
} /* end ehca_mrmw_reverse_map_acl() */


/*----------------------------------------------------------------------*/

/*
 * MR destructor and constructor
 * used in Reregister MR verb, sets all fields in ehca_mr_t to 0,
 * except struct ib_mr and spinlock
 */
void ehca_mr_deletenew(struct ehca_mr *mr)
{
	mr->flags         = 0;
	mr->num_pages     = 0;
	mr->num_4k        = 0;
	mr->acl           = 0;
	mr->start         = NULL;
	mr->fmr_page_size = 0;
	mr->fmr_max_pages = 0;
	mr->fmr_max_maps  = 0;
	mr->fmr_map_cnt   = 0;
	memset(&mr->ipz_mr_handle, 0, sizeof(mr->ipz_mr_handle));
	memset(&mr->galpas, 0, sizeof(mr->galpas));
	mr->nr_of_pages   = 0;
	mr->pagearray     = NULL;
} /* end ehca_mr_deletenew() */

int ehca_init_mrmw_cache(void)
{
	mr_cache = kmem_cache_create("ehca_cache_mr",
				     sizeof(struct ehca_mr), 0,
				     SLAB_HWCACHE_ALIGN,
				     NULL, NULL);
	if (!mr_cache)
		return -ENOMEM;
	mw_cache = kmem_cache_create("ehca_cache_mw",
				     sizeof(struct ehca_mw), 0,
				     SLAB_HWCACHE_ALIGN,
				     NULL, NULL);
	if (!mw_cache) {
		kmem_cache_destroy(mr_cache);
		mr_cache = NULL;
		return -ENOMEM;
	}
	return 0;
}

void ehca_cleanup_mrmw_cache(void)
{
	if (mr_cache)
		kmem_cache_destroy(mr_cache);
	if (mw_cache)
		kmem_cache_destroy(mw_cache);
}