linux/drivers/infiniband/hw/hfi1/user_pages.c

// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
/*
 * Copyright(c) 2015-2017 Intel Corporation.
 */

#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 = …;
module_param(cache_size, ulong, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(…) …;

/*
 * 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)
{ … }

int hfi1_acquire_user_pages(struct mm_struct *mm, unsigned long vaddr, size_t npages,
			    bool writable, struct page **pages)
{ … }

void hfi1_release_user_pages(struct mm_struct *mm, struct page **p,
			     size_t npages, bool dirty)
{ … }