/*
|
* Copyright(c) 2015-2017 Intel Corporation.
|
*
|
* This file is provided under a dual BSD/GPLv2 license. When using or
|
* redistributing this file, you may do so under either license.
|
*
|
* GPL LICENSE SUMMARY
|
*
|
* This program is free software; you can redistribute it and/or modify
|
* it under the terms of version 2 of the GNU General Public License as
|
* published by the Free Software Foundation.
|
*
|
* This program is distributed in the hope that it will be useful, but
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
* General Public License for more details.
|
*
|
* 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.
|
* - Neither the name of Intel Corporation nor the names of its
|
* contributors may be used to endorse or promote products derived
|
* from this software without specific prior written permission.
|
*
|
* 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 <linux/mm.h>
|
#include <linux/sched/signal.h>
|
#include <linux/device.h>
|
#include <linux/module.h>
|
|
#include "hfi.h"
|
|
static unsigned long cache_size = 256;
|
module_param(cache_size, ulong, S_IRUGO | S_IWUSR);
|
MODULE_PARM_DESC(cache_size, "Send and receive side cache size limit (in MB)");
|
|
/*
|
* Determine whether the caller can pin pages.
|
*
|
* This function should be used in the implementation of buffer caches.
|
* The cache implementation should call this function prior to attempting
|
* to pin buffer pages in order to determine whether they should do so.
|
* The function computes cache limits based on the configured ulimit and
|
* cache size. Use of this function is especially important for caches
|
* which are not limited in any other way (e.g. by HW resources) and, thus,
|
* could keeping caching buffers.
|
*
|
*/
|
bool hfi1_can_pin_pages(struct hfi1_devdata *dd, struct mm_struct *mm,
|
u32 nlocked, u32 npages)
|
{
|
unsigned long ulimit = rlimit(RLIMIT_MEMLOCK), pinned, cache_limit,
|
size = (cache_size * (1UL << 20)); /* convert to bytes */
|
unsigned int usr_ctxts =
|
dd->num_rcv_contexts - dd->first_dyn_alloc_ctxt;
|
bool can_lock = capable(CAP_IPC_LOCK);
|
|
/*
|
* Calculate per-cache size. The calculation below uses only a quarter
|
* of the available per-context limit. This leaves space for other
|
* pinning. Should we worry about shared ctxts?
|
*/
|
cache_limit = (ulimit / usr_ctxts) / 4;
|
|
/* If ulimit isn't set to "unlimited" and is smaller than cache_size. */
|
if (ulimit != (-1UL) && size > cache_limit)
|
size = cache_limit;
|
|
/* Convert to number of pages */
|
size = DIV_ROUND_UP(size, PAGE_SIZE);
|
|
pinned = atomic64_read(&mm->pinned_vm);
|
|
/* First, check the absolute limit against all pinned pages. */
|
if (pinned + npages >= ulimit && !can_lock)
|
return false;
|
|
return ((nlocked + npages) <= size) || can_lock;
|
}
|
|
int hfi1_acquire_user_pages(struct mm_struct *mm, unsigned long vaddr, size_t npages,
|
bool writable, struct page **pages)
|
{
|
int ret;
|
unsigned int gup_flags = FOLL_LONGTERM | (writable ? FOLL_WRITE : 0);
|
|
ret = pin_user_pages_fast(vaddr, npages, gup_flags, pages);
|
if (ret < 0)
|
return ret;
|
|
atomic64_add(ret, &mm->pinned_vm);
|
|
return ret;
|
}
|
|
void hfi1_release_user_pages(struct mm_struct *mm, struct page **p,
|
size_t npages, bool dirty)
|
{
|
unpin_user_pages_dirty_lock(p, npages, dirty);
|
|
if (mm) { /* during close after signal, mm can be NULL */
|
atomic64_sub(npages, &mm->pinned_vm);
|
}
|
}
|
