110 lines
3.4 KiB
C
110 lines
3.4 KiB
C
/*
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* Copyright (c) 2014 Mellanox Technologies. 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 <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/interval_tree_generic.h>
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#include <linux/sched.h>
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#include <linux/gfp.h>
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#include <rdma/ib_umem_odp.h>
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/*
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* The ib_umem list keeps track of memory regions for which the HW
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* device request to receive notification when the related memory
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* mapping is changed.
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*
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* ib_umem_lock protects the list.
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*/
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static inline u64 node_start(struct umem_odp_node *n)
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{
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struct ib_umem_odp *umem_odp =
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container_of(n, struct ib_umem_odp, interval_tree);
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return ib_umem_start(umem_odp->umem);
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}
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/* Note that the representation of the intervals in the interval tree
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* considers the ending point as contained in the interval, while the
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* function ib_umem_end returns the first address which is not contained
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* in the umem.
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*/
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static inline u64 node_last(struct umem_odp_node *n)
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{
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struct ib_umem_odp *umem_odp =
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container_of(n, struct ib_umem_odp, interval_tree);
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return ib_umem_end(umem_odp->umem) - 1;
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}
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INTERVAL_TREE_DEFINE(struct umem_odp_node, rb, u64, __subtree_last,
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node_start, node_last, , rbt_ib_umem)
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/* @last is not a part of the interval. See comment for function
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* node_last.
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*/
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int rbt_ib_umem_for_each_in_range(struct rb_root *root,
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u64 start, u64 last,
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umem_call_back cb,
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void *cookie)
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{
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int ret_val = 0;
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struct umem_odp_node *node, *next;
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struct ib_umem_odp *umem;
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if (unlikely(start == last))
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return ret_val;
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for (node = rbt_ib_umem_iter_first(root, start, last - 1);
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node; node = next) {
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next = rbt_ib_umem_iter_next(node, start, last - 1);
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umem = container_of(node, struct ib_umem_odp, interval_tree);
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ret_val = cb(umem->umem, start, last, cookie) || ret_val;
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}
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return ret_val;
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}
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EXPORT_SYMBOL(rbt_ib_umem_for_each_in_range);
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struct ib_umem_odp *rbt_ib_umem_lookup(struct rb_root *root,
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u64 addr, u64 length)
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{
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struct umem_odp_node *node;
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node = rbt_ib_umem_iter_first(root, addr, addr + length - 1);
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if (node)
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return container_of(node, struct ib_umem_odp, interval_tree);
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return NULL;
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}
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EXPORT_SYMBOL(rbt_ib_umem_lookup);
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