547 lines
13 KiB
C
547 lines
13 KiB
C
/*
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*
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* This file is provided under a dual BSD/GPLv2 license. When using or
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* redistributing this file, you may do so under either license.
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*
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* GPL LICENSE SUMMARY
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*
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* Copyright(c) 2015 Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* BSD LICENSE
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*
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* Copyright(c) 2015 Intel Corporation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* - Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include <rdma/ib_umem.h>
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#include <rdma/ib_smi.h>
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#include "hfi.h"
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/* Fast memory region */
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struct hfi1_fmr {
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struct ib_fmr ibfmr;
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struct hfi1_mregion mr; /* must be last */
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};
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static inline struct hfi1_fmr *to_ifmr(struct ib_fmr *ibfmr)
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{
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return container_of(ibfmr, struct hfi1_fmr, ibfmr);
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}
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static int init_mregion(struct hfi1_mregion *mr, struct ib_pd *pd,
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int count)
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{
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int m, i = 0;
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int rval = 0;
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m = (count + HFI1_SEGSZ - 1) / HFI1_SEGSZ;
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for (; i < m; i++) {
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mr->map[i] = kzalloc(sizeof(*mr->map[0]), GFP_KERNEL);
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if (!mr->map[i])
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goto bail;
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}
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mr->mapsz = m;
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init_completion(&mr->comp);
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/* count returning the ptr to user */
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atomic_set(&mr->refcount, 1);
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mr->pd = pd;
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mr->max_segs = count;
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out:
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return rval;
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bail:
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while (i)
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kfree(mr->map[--i]);
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rval = -ENOMEM;
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goto out;
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}
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static void deinit_mregion(struct hfi1_mregion *mr)
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{
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int i = mr->mapsz;
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mr->mapsz = 0;
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while (i)
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kfree(mr->map[--i]);
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}
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/**
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* hfi1_get_dma_mr - get a DMA memory region
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* @pd: protection domain for this memory region
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* @acc: access flags
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*
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* Returns the memory region on success, otherwise returns an errno.
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* Note that all DMA addresses should be created via the
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* struct ib_dma_mapping_ops functions (see dma.c).
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*/
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struct ib_mr *hfi1_get_dma_mr(struct ib_pd *pd, int acc)
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{
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struct hfi1_mr *mr = NULL;
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struct ib_mr *ret;
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int rval;
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if (to_ipd(pd)->user) {
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ret = ERR_PTR(-EPERM);
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goto bail;
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}
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mr = kzalloc(sizeof(*mr), GFP_KERNEL);
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if (!mr) {
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ret = ERR_PTR(-ENOMEM);
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goto bail;
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}
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rval = init_mregion(&mr->mr, pd, 0);
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if (rval) {
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ret = ERR_PTR(rval);
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goto bail;
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}
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rval = hfi1_alloc_lkey(&mr->mr, 1);
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if (rval) {
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ret = ERR_PTR(rval);
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goto bail_mregion;
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}
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mr->mr.access_flags = acc;
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ret = &mr->ibmr;
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done:
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return ret;
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bail_mregion:
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deinit_mregion(&mr->mr);
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bail:
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kfree(mr);
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goto done;
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}
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static struct hfi1_mr *alloc_mr(int count, struct ib_pd *pd)
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{
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struct hfi1_mr *mr;
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int rval = -ENOMEM;
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int m;
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/* Allocate struct plus pointers to first level page tables. */
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m = (count + HFI1_SEGSZ - 1) / HFI1_SEGSZ;
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mr = kzalloc(sizeof(*mr) + m * sizeof(mr->mr.map[0]), GFP_KERNEL);
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if (!mr)
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goto bail;
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rval = init_mregion(&mr->mr, pd, count);
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if (rval)
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goto bail;
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/*
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* ib_reg_phys_mr() will initialize mr->ibmr except for
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* lkey and rkey.
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*/
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rval = hfi1_alloc_lkey(&mr->mr, 0);
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if (rval)
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goto bail_mregion;
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mr->ibmr.lkey = mr->mr.lkey;
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mr->ibmr.rkey = mr->mr.lkey;
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done:
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return mr;
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bail_mregion:
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deinit_mregion(&mr->mr);
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bail:
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kfree(mr);
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mr = ERR_PTR(rval);
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goto done;
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}
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/**
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* hfi1_reg_phys_mr - register a physical memory region
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* @pd: protection domain for this memory region
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* @buffer_list: pointer to the list of physical buffers to register
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* @num_phys_buf: the number of physical buffers to register
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* @iova_start: the starting address passed over IB which maps to this MR
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*
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* Returns the memory region on success, otherwise returns an errno.
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*/
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struct ib_mr *hfi1_reg_phys_mr(struct ib_pd *pd,
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struct ib_phys_buf *buffer_list,
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int num_phys_buf, int acc, u64 *iova_start)
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{
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struct hfi1_mr *mr;
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int n, m, i;
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struct ib_mr *ret;
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mr = alloc_mr(num_phys_buf, pd);
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if (IS_ERR(mr)) {
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ret = (struct ib_mr *)mr;
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goto bail;
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}
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mr->mr.user_base = *iova_start;
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mr->mr.iova = *iova_start;
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mr->mr.access_flags = acc;
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m = 0;
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n = 0;
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for (i = 0; i < num_phys_buf; i++) {
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mr->mr.map[m]->segs[n].vaddr = (void *) buffer_list[i].addr;
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mr->mr.map[m]->segs[n].length = buffer_list[i].size;
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mr->mr.length += buffer_list[i].size;
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n++;
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if (n == HFI1_SEGSZ) {
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m++;
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n = 0;
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}
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}
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ret = &mr->ibmr;
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bail:
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return ret;
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}
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/**
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* hfi1_reg_user_mr - register a userspace memory region
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* @pd: protection domain for this memory region
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* @start: starting userspace address
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* @length: length of region to register
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* @mr_access_flags: access flags for this memory region
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* @udata: unused by the driver
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*
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* Returns the memory region on success, otherwise returns an errno.
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*/
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struct ib_mr *hfi1_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
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u64 virt_addr, int mr_access_flags,
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struct ib_udata *udata)
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{
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struct hfi1_mr *mr;
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struct ib_umem *umem;
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struct scatterlist *sg;
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int n, m, entry;
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struct ib_mr *ret;
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if (length == 0) {
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ret = ERR_PTR(-EINVAL);
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goto bail;
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}
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umem = ib_umem_get(pd->uobject->context, start, length,
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mr_access_flags, 0);
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if (IS_ERR(umem))
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return (void *) umem;
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n = umem->nmap;
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mr = alloc_mr(n, pd);
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if (IS_ERR(mr)) {
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ret = (struct ib_mr *)mr;
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ib_umem_release(umem);
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goto bail;
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}
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mr->mr.user_base = start;
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mr->mr.iova = virt_addr;
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mr->mr.length = length;
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mr->mr.offset = ib_umem_offset(umem);
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mr->mr.access_flags = mr_access_flags;
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mr->umem = umem;
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if (is_power_of_2(umem->page_size))
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mr->mr.page_shift = ilog2(umem->page_size);
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m = 0;
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n = 0;
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for_each_sg(umem->sg_head.sgl, sg, umem->nmap, entry) {
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void *vaddr;
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vaddr = page_address(sg_page(sg));
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if (!vaddr) {
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ret = ERR_PTR(-EINVAL);
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goto bail;
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}
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mr->mr.map[m]->segs[n].vaddr = vaddr;
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mr->mr.map[m]->segs[n].length = umem->page_size;
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n++;
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if (n == HFI1_SEGSZ) {
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m++;
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n = 0;
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}
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}
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ret = &mr->ibmr;
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bail:
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return ret;
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}
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/**
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* hfi1_dereg_mr - unregister and free a memory region
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* @ibmr: the memory region to free
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*
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* Returns 0 on success.
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*
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* Note that this is called to free MRs created by hfi1_get_dma_mr()
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* or hfi1_reg_user_mr().
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*/
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int hfi1_dereg_mr(struct ib_mr *ibmr)
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{
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struct hfi1_mr *mr = to_imr(ibmr);
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int ret = 0;
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unsigned long timeout;
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hfi1_free_lkey(&mr->mr);
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hfi1_put_mr(&mr->mr); /* will set completion if last */
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timeout = wait_for_completion_timeout(&mr->mr.comp,
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5 * HZ);
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if (!timeout) {
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dd_dev_err(
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dd_from_ibdev(mr->mr.pd->device),
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"hfi1_dereg_mr timeout mr %p pd %p refcount %u\n",
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mr, mr->mr.pd, atomic_read(&mr->mr.refcount));
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hfi1_get_mr(&mr->mr);
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ret = -EBUSY;
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goto out;
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}
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deinit_mregion(&mr->mr);
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if (mr->umem)
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ib_umem_release(mr->umem);
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kfree(mr);
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out:
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return ret;
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}
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/*
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* Allocate a memory region usable with the
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* IB_WR_FAST_REG_MR send work request.
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*
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* Return the memory region on success, otherwise return an errno.
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*/
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struct ib_mr *hfi1_alloc_fast_reg_mr(struct ib_pd *pd, int max_page_list_len)
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{
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struct hfi1_mr *mr;
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mr = alloc_mr(max_page_list_len, pd);
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if (IS_ERR(mr))
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return (struct ib_mr *)mr;
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return &mr->ibmr;
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}
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struct ib_fast_reg_page_list *
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hfi1_alloc_fast_reg_page_list(struct ib_device *ibdev, int page_list_len)
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{
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unsigned size = page_list_len * sizeof(u64);
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struct ib_fast_reg_page_list *pl;
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if (size > PAGE_SIZE)
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return ERR_PTR(-EINVAL);
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pl = kzalloc(sizeof(*pl), GFP_KERNEL);
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if (!pl)
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return ERR_PTR(-ENOMEM);
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pl->page_list = kzalloc(size, GFP_KERNEL);
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if (!pl->page_list)
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goto err_free;
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return pl;
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err_free:
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kfree(pl);
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return ERR_PTR(-ENOMEM);
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}
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void hfi1_free_fast_reg_page_list(struct ib_fast_reg_page_list *pl)
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{
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kfree(pl->page_list);
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kfree(pl);
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}
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/**
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* hfi1_alloc_fmr - allocate a fast memory region
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* @pd: the protection domain for this memory region
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* @mr_access_flags: access flags for this memory region
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* @fmr_attr: fast memory region attributes
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*
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* Returns the memory region on success, otherwise returns an errno.
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*/
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struct ib_fmr *hfi1_alloc_fmr(struct ib_pd *pd, int mr_access_flags,
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struct ib_fmr_attr *fmr_attr)
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{
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struct hfi1_fmr *fmr;
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int m;
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struct ib_fmr *ret;
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int rval = -ENOMEM;
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/* Allocate struct plus pointers to first level page tables. */
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m = (fmr_attr->max_pages + HFI1_SEGSZ - 1) / HFI1_SEGSZ;
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fmr = kzalloc(sizeof(*fmr) + m * sizeof(fmr->mr.map[0]), GFP_KERNEL);
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if (!fmr)
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goto bail;
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rval = init_mregion(&fmr->mr, pd, fmr_attr->max_pages);
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if (rval)
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goto bail;
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/*
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* ib_alloc_fmr() will initialize fmr->ibfmr except for lkey &
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* rkey.
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*/
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rval = hfi1_alloc_lkey(&fmr->mr, 0);
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if (rval)
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goto bail_mregion;
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fmr->ibfmr.rkey = fmr->mr.lkey;
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fmr->ibfmr.lkey = fmr->mr.lkey;
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/*
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* Resources are allocated but no valid mapping (RKEY can't be
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* used).
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*/
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fmr->mr.access_flags = mr_access_flags;
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fmr->mr.max_segs = fmr_attr->max_pages;
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fmr->mr.page_shift = fmr_attr->page_shift;
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ret = &fmr->ibfmr;
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done:
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return ret;
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bail_mregion:
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deinit_mregion(&fmr->mr);
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bail:
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kfree(fmr);
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ret = ERR_PTR(rval);
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goto done;
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}
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/**
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* hfi1_map_phys_fmr - set up a fast memory region
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* @ibmfr: the fast memory region to set up
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* @page_list: the list of pages to associate with the fast memory region
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* @list_len: the number of pages to associate with the fast memory region
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* @iova: the virtual address of the start of the fast memory region
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*
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* This may be called from interrupt context.
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*/
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int hfi1_map_phys_fmr(struct ib_fmr *ibfmr, u64 *page_list,
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int list_len, u64 iova)
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{
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struct hfi1_fmr *fmr = to_ifmr(ibfmr);
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struct hfi1_lkey_table *rkt;
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unsigned long flags;
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int m, n, i;
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u32 ps;
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int ret;
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i = atomic_read(&fmr->mr.refcount);
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if (i > 2)
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return -EBUSY;
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if (list_len > fmr->mr.max_segs) {
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ret = -EINVAL;
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goto bail;
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}
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rkt = &to_idev(ibfmr->device)->lk_table;
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spin_lock_irqsave(&rkt->lock, flags);
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fmr->mr.user_base = iova;
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fmr->mr.iova = iova;
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ps = 1 << fmr->mr.page_shift;
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fmr->mr.length = list_len * ps;
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m = 0;
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n = 0;
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for (i = 0; i < list_len; i++) {
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fmr->mr.map[m]->segs[n].vaddr = (void *) page_list[i];
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fmr->mr.map[m]->segs[n].length = ps;
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if (++n == HFI1_SEGSZ) {
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m++;
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n = 0;
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}
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}
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spin_unlock_irqrestore(&rkt->lock, flags);
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ret = 0;
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bail:
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return ret;
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}
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/**
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* hfi1_unmap_fmr - unmap fast memory regions
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* @fmr_list: the list of fast memory regions to unmap
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*
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* Returns 0 on success.
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*/
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int hfi1_unmap_fmr(struct list_head *fmr_list)
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{
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struct hfi1_fmr *fmr;
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struct hfi1_lkey_table *rkt;
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unsigned long flags;
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list_for_each_entry(fmr, fmr_list, ibfmr.list) {
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rkt = &to_idev(fmr->ibfmr.device)->lk_table;
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spin_lock_irqsave(&rkt->lock, flags);
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fmr->mr.user_base = 0;
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fmr->mr.iova = 0;
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fmr->mr.length = 0;
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spin_unlock_irqrestore(&rkt->lock, flags);
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}
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return 0;
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}
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/**
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* hfi1_dealloc_fmr - deallocate a fast memory region
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* @ibfmr: the fast memory region to deallocate
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*
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* Returns 0 on success.
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*/
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int hfi1_dealloc_fmr(struct ib_fmr *ibfmr)
|
|
{
|
|
struct hfi1_fmr *fmr = to_ifmr(ibfmr);
|
|
int ret = 0;
|
|
unsigned long timeout;
|
|
|
|
hfi1_free_lkey(&fmr->mr);
|
|
hfi1_put_mr(&fmr->mr); /* will set completion if last */
|
|
timeout = wait_for_completion_timeout(&fmr->mr.comp,
|
|
5 * HZ);
|
|
if (!timeout) {
|
|
hfi1_get_mr(&fmr->mr);
|
|
ret = -EBUSY;
|
|
goto out;
|
|
}
|
|
deinit_mregion(&fmr->mr);
|
|
kfree(fmr);
|
|
out:
|
|
return ret;
|
|
}
|