2a600f14d2
The current code loops during rkey/lkey validiation to isolate the MR for the RDMA, which is expensive when the current operation is inside a very large memory region. This fix optimizes rkey/lkey validation routines for user memory regions and fast memory regions. The MR entry can be isolated by shifts/mods instead of looping. The existing loop is preserved for phys memory regions for now. Signed-off-by: Mike Marciniszyn <mike.marciniszyn@qlogic.com> Signed-off-by: Roland Dreier <rolandd@cisco.com>
505 lines
12 KiB
C
505 lines
12 KiB
C
/*
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* Copyright (c) 2006, 2007, 2008, 2009 QLogic Corporation. All rights reserved.
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* Copyright (c) 2005, 2006 PathScale, Inc. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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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 "qib.h"
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/* Fast memory region */
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struct qib_fmr {
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struct ib_fmr ibfmr;
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struct qib_mregion mr; /* must be last */
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};
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static inline struct qib_fmr *to_ifmr(struct ib_fmr *ibfmr)
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{
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return container_of(ibfmr, struct qib_fmr, ibfmr);
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}
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/**
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* qib_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 qib_dma.c).
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*/
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struct ib_mr *qib_get_dma_mr(struct ib_pd *pd, int acc)
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{
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struct qib_ibdev *dev = to_idev(pd->device);
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struct qib_mr *mr;
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struct ib_mr *ret;
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unsigned long flags;
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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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mr->mr.access_flags = acc;
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atomic_set(&mr->mr.refcount, 0);
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spin_lock_irqsave(&dev->lk_table.lock, flags);
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if (!dev->dma_mr)
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dev->dma_mr = &mr->mr;
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spin_unlock_irqrestore(&dev->lk_table.lock, flags);
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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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static struct qib_mr *alloc_mr(int count, struct qib_lkey_table *lk_table)
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{
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struct qib_mr *mr;
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int m, i = 0;
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/* Allocate struct plus pointers to first level page tables. */
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m = (count + QIB_SEGSZ - 1) / QIB_SEGSZ;
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mr = kmalloc(sizeof *mr + m * sizeof mr->mr.map[0], GFP_KERNEL);
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if (!mr)
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goto done;
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/* Allocate first level page tables. */
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for (; i < m; i++) {
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mr->mr.map[i] = kmalloc(sizeof *mr->mr.map[0], GFP_KERNEL);
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if (!mr->mr.map[i])
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goto bail;
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}
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mr->mr.mapsz = m;
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mr->mr.page_shift = 0;
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mr->mr.max_segs = count;
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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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if (!qib_alloc_lkey(lk_table, &mr->mr))
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goto bail;
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mr->ibmr.lkey = mr->mr.lkey;
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mr->ibmr.rkey = mr->mr.lkey;
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atomic_set(&mr->mr.refcount, 0);
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goto done;
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bail:
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while (i)
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kfree(mr->mr.map[--i]);
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kfree(mr);
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mr = NULL;
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done:
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return mr;
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}
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/**
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* qib_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 *qib_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 qib_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, &to_idev(pd->device)->lk_table);
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if (mr == NULL) {
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ret = ERR_PTR(-ENOMEM);
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goto bail;
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}
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mr->mr.pd = pd;
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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.length = 0;
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mr->mr.offset = 0;
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mr->mr.access_flags = acc;
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mr->umem = NULL;
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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 == QIB_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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* qib_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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* @virt_addr: virtual address to use (from HCA's point of view)
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* @mr_access_flags: access flags for this memory region
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* @udata: unused by the QLogic_IB 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 *qib_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 qib_mr *mr;
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struct ib_umem *umem;
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struct ib_umem_chunk *chunk;
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int n, m, i;
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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 = 0;
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list_for_each_entry(chunk, &umem->chunk_list, list)
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n += chunk->nents;
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mr = alloc_mr(n, &to_idev(pd->device)->lk_table);
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if (!mr) {
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ret = ERR_PTR(-ENOMEM);
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ib_umem_release(umem);
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goto bail;
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}
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mr->mr.pd = pd;
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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 = umem->offset;
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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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list_for_each_entry(chunk, &umem->chunk_list, list) {
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for (i = 0; i < chunk->nents; i++) {
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void *vaddr;
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vaddr = page_address(sg_page(&chunk->page_list[i]));
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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 == QIB_SEGSZ) {
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m++;
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n = 0;
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}
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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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* qib_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 qib_get_dma_mr()
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* or qib_reg_user_mr().
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*/
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int qib_dereg_mr(struct ib_mr *ibmr)
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{
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struct qib_mr *mr = to_imr(ibmr);
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struct qib_ibdev *dev = to_idev(ibmr->device);
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int ret;
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int i;
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ret = qib_free_lkey(dev, &mr->mr);
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if (ret)
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return ret;
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i = mr->mr.mapsz;
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while (i)
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kfree(mr->mr.map[--i]);
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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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return 0;
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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 *qib_alloc_fast_reg_mr(struct ib_pd *pd, int max_page_list_len)
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{
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struct qib_mr *mr;
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mr = alloc_mr(max_page_list_len, &to_idev(pd->device)->lk_table);
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if (mr == NULL)
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return ERR_PTR(-ENOMEM);
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mr->mr.pd = pd;
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mr->mr.user_base = 0;
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mr->mr.iova = 0;
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mr->mr.length = 0;
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mr->mr.offset = 0;
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mr->mr.access_flags = 0;
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mr->umem = NULL;
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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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qib_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 = kmalloc(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 = kmalloc(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 qib_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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* qib_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 *qib_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 qib_fmr *fmr;
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int m, i = 0;
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struct ib_fmr *ret;
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/* Allocate struct plus pointers to first level page tables. */
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m = (fmr_attr->max_pages + QIB_SEGSZ - 1) / QIB_SEGSZ;
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fmr = kmalloc(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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/* Allocate first level page tables. */
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for (; i < m; i++) {
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fmr->mr.map[i] = kmalloc(sizeof *fmr->mr.map[0],
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GFP_KERNEL);
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if (!fmr->mr.map[i])
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goto bail;
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}
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fmr->mr.mapsz = m;
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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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if (!qib_alloc_lkey(&to_idev(pd->device)->lk_table, &fmr->mr))
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goto bail;
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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.pd = pd;
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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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fmr->mr.offset = 0;
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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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atomic_set(&fmr->mr.refcount, 0);
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ret = &fmr->ibfmr;
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goto done;
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bail:
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while (i)
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kfree(fmr->mr.map[--i]);
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kfree(fmr);
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ret = ERR_PTR(-ENOMEM);
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done:
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return ret;
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}
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/**
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* qib_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 qib_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 qib_fmr *fmr = to_ifmr(ibfmr);
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struct qib_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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if (atomic_read(&fmr->mr.refcount))
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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 == QIB_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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* qib_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 qib_unmap_fmr(struct list_head *fmr_list)
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{
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struct qib_fmr *fmr;
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struct qib_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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* qib_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 qib_dealloc_fmr(struct ib_fmr *ibfmr)
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{
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struct qib_fmr *fmr = to_ifmr(ibfmr);
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int ret;
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int i;
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ret = qib_free_lkey(to_idev(ibfmr->device), &fmr->mr);
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if (ret)
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return ret;
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i = fmr->mr.mapsz;
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while (i)
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kfree(fmr->mr.map[--i]);
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kfree(fmr);
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return 0;
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}
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