110 lines
3.5 KiB
C
110 lines
3.5 KiB
C
/*
|
|
* Copyright (c) 2014 Mellanox Technologies. All rights reserved.
|
|
*
|
|
* This software is available to you under a choice of one of two
|
|
* licenses. You may choose to be licensed under the terms of the GNU
|
|
* General Public License (GPL) Version 2, available from the file
|
|
* COPYING in the main directory of this source tree, or the
|
|
* OpenIB.org BSD license below:
|
|
*
|
|
* Redistribution and use in source and binary forms, with or
|
|
* without modification, are permitted provided that the following
|
|
* conditions are met:
|
|
*
|
|
* - Redistributions of source code must retain the above
|
|
* copyright notice, this list of conditions and the following
|
|
* disclaimer.
|
|
*
|
|
* - Redistributions in binary form must reproduce the above
|
|
* copyright notice, this list of conditions and the following
|
|
* disclaimer in the documentation and/or other materials
|
|
* provided with the distribution.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
|
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
|
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
|
|
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
|
|
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
|
|
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
* SOFTWARE.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/interval_tree_generic.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/gfp.h>
|
|
#include <rdma/ib_umem_odp.h>
|
|
|
|
/*
|
|
* The ib_umem list keeps track of memory regions for which the HW
|
|
* device request to receive notification when the related memory
|
|
* mapping is changed.
|
|
*
|
|
* ib_umem_lock protects the list.
|
|
*/
|
|
|
|
static inline u64 node_start(struct umem_odp_node *n)
|
|
{
|
|
struct ib_umem_odp *umem_odp =
|
|
container_of(n, struct ib_umem_odp, interval_tree);
|
|
|
|
return ib_umem_start(umem_odp->umem);
|
|
}
|
|
|
|
/* Note that the representation of the intervals in the interval tree
|
|
* considers the ending point as contained in the interval, while the
|
|
* function ib_umem_end returns the first address which is not contained
|
|
* in the umem.
|
|
*/
|
|
static inline u64 node_last(struct umem_odp_node *n)
|
|
{
|
|
struct ib_umem_odp *umem_odp =
|
|
container_of(n, struct ib_umem_odp, interval_tree);
|
|
|
|
return ib_umem_end(umem_odp->umem) - 1;
|
|
}
|
|
|
|
INTERVAL_TREE_DEFINE(struct umem_odp_node, rb, u64, __subtree_last,
|
|
node_start, node_last, , rbt_ib_umem)
|
|
|
|
/* @last is not a part of the interval. See comment for function
|
|
* node_last.
|
|
*/
|
|
int rbt_ib_umem_for_each_in_range(struct rb_root_cached *root,
|
|
u64 start, u64 last,
|
|
umem_call_back cb,
|
|
void *cookie)
|
|
{
|
|
int ret_val = 0;
|
|
struct umem_odp_node *node, *next;
|
|
struct ib_umem_odp *umem;
|
|
|
|
if (unlikely(start == last))
|
|
return ret_val;
|
|
|
|
for (node = rbt_ib_umem_iter_first(root, start, last - 1);
|
|
node; node = next) {
|
|
next = rbt_ib_umem_iter_next(node, start, last - 1);
|
|
umem = container_of(node, struct ib_umem_odp, interval_tree);
|
|
ret_val = cb(umem->umem, start, last, cookie) || ret_val;
|
|
}
|
|
|
|
return ret_val;
|
|
}
|
|
EXPORT_SYMBOL(rbt_ib_umem_for_each_in_range);
|
|
|
|
struct ib_umem_odp *rbt_ib_umem_lookup(struct rb_root_cached *root,
|
|
u64 addr, u64 length)
|
|
{
|
|
struct umem_odp_node *node;
|
|
|
|
node = rbt_ib_umem_iter_first(root, addr, addr + length - 1);
|
|
if (node)
|
|
return container_of(node, struct ib_umem_odp, interval_tree);
|
|
return NULL;
|
|
|
|
}
|
|
EXPORT_SYMBOL(rbt_ib_umem_lookup);
|