diff options
Diffstat (limited to 'drivers/staging/rdma/hfi1/user_pages.c')
| -rw-r--r-- | drivers/staging/rdma/hfi1/user_pages.c | 135 |
1 files changed, 0 insertions, 135 deletions
diff --git a/drivers/staging/rdma/hfi1/user_pages.c b/drivers/staging/rdma/hfi1/user_pages.c deleted file mode 100644 index 88e10b5f55f1..000000000000 --- a/drivers/staging/rdma/hfi1/user_pages.c +++ /dev/null @@ -1,135 +0,0 @@ -/* - * Copyright(c) 2015, 2016 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.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, u32 nlocked, u32 npages) -{ - unsigned long ulimit = rlimit(RLIMIT_MEMLOCK), pinned, cache_limit, - size = (cache_size * (1UL << 20)); /* convert to bytes */ - unsigned usr_ctxts = dd->num_rcv_contexts - dd->first_user_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); - - down_read(¤t->mm->mmap_sem); - pinned = current->mm->pinned_vm; - up_read(¤t->mm->mmap_sem); - - /* 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(unsigned long vaddr, size_t npages, bool writable, - struct page **pages) -{ - int ret; - - ret = get_user_pages_fast(vaddr, npages, writable, pages); - if (ret < 0) - return ret; - - down_write(¤t->mm->mmap_sem); - current->mm->pinned_vm += ret; - up_write(¤t->mm->mmap_sem); - - return ret; -} - -void hfi1_release_user_pages(struct mm_struct *mm, struct page **p, - size_t npages, bool dirty) -{ - size_t i; - - for (i = 0; i < npages; i++) { - if (dirty) - set_page_dirty_lock(p[i]); - put_page(p[i]); - } - - if (mm) { /* during close after signal, mm can be NULL */ - down_write(&mm->mmap_sem); - mm->pinned_vm -= npages; - up_write(&mm->mmap_sem); - } -} |