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2d15eb31b5
[11~From: John Hubbard <jhubbard@nvidia.com>
Subject: mm/gup: add make_dirty arg to put_user_pages_dirty_lock()
Patch series "mm/gup: add make_dirty arg to put_user_pages_dirty_lock()",
v3.
There are about 50+ patches in my tree [2], and I'll be sending out the
remaining ones in a few more groups:
* The block/bio related changes (Jerome mostly wrote those, but I've had
to move stuff around extensively, and add a little code)
* mm/ changes
* other subsystem patches
* an RFC that shows the current state of the tracking patch set. That
can only be applied after all call sites are converted, but it's good to
get an early look at it.
This is part a tree-wide conversion, as described in fc1d8e7cca ("mm:
introduce put_user_page*(), placeholder versions").
This patch (of 3):
Provide more capable variation of put_user_pages_dirty_lock(), and delete
put_user_pages_dirty(). This is based on the following:
1. Lots of call sites become simpler if a bool is passed into
put_user_page*(), instead of making the call site choose which
put_user_page*() variant to call.
2. Christoph Hellwig's observation that set_page_dirty_lock() is
usually correct, and set_page_dirty() is usually a bug, or at least
questionable, within a put_user_page*() calling chain.
This leads to the following API choices:
* put_user_pages_dirty_lock(page, npages, make_dirty)
* There is no put_user_pages_dirty(). You have to
hand code that, in the rare case that it's
required.
[jhubbard@nvidia.com: remove unused variable in siw_free_plist()]
Link: http://lkml.kernel.org/r/20190729074306.10368-1-jhubbard@nvidia.com
Link: http://lkml.kernel.org/r/20190724044537.10458-2-jhubbard@nvidia.com
Signed-off-by: John Hubbard <jhubbard@nvidia.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Jan Kara <jack@suse.cz>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Ira Weiny <ira.weiny@intel.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
127 lines
4.6 KiB
C
127 lines
4.6 KiB
C
/*
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* Copyright(c) 2015-2017 Intel Corporation.
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*
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* This file is provided under a dual BSD/GPLv2 license. When using or
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* redistributing this file, you may do so under either license.
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*
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* GPL LICENSE SUMMARY
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* BSD LICENSE
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* - Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include <linux/mm.h>
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#include <linux/sched/signal.h>
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#include <linux/device.h>
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#include <linux/module.h>
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#include "hfi.h"
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static unsigned long cache_size = 256;
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module_param(cache_size, ulong, S_IRUGO | S_IWUSR);
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MODULE_PARM_DESC(cache_size, "Send and receive side cache size limit (in MB)");
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/*
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* Determine whether the caller can pin pages.
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*
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* This function should be used in the implementation of buffer caches.
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* The cache implementation should call this function prior to attempting
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* to pin buffer pages in order to determine whether they should do so.
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* The function computes cache limits based on the configured ulimit and
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* cache size. Use of this function is especially important for caches
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* which are not limited in any other way (e.g. by HW resources) and, thus,
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* could keeping caching buffers.
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*
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*/
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bool hfi1_can_pin_pages(struct hfi1_devdata *dd, struct mm_struct *mm,
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u32 nlocked, u32 npages)
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{
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unsigned long ulimit = rlimit(RLIMIT_MEMLOCK), pinned, cache_limit,
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size = (cache_size * (1UL << 20)); /* convert to bytes */
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unsigned int usr_ctxts =
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dd->num_rcv_contexts - dd->first_dyn_alloc_ctxt;
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bool can_lock = capable(CAP_IPC_LOCK);
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/*
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* Calculate per-cache size. The calculation below uses only a quarter
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* of the available per-context limit. This leaves space for other
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* pinning. Should we worry about shared ctxts?
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*/
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cache_limit = (ulimit / usr_ctxts) / 4;
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/* If ulimit isn't set to "unlimited" and is smaller than cache_size. */
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if (ulimit != (-1UL) && size > cache_limit)
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size = cache_limit;
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/* Convert to number of pages */
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size = DIV_ROUND_UP(size, PAGE_SIZE);
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pinned = atomic64_read(&mm->pinned_vm);
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/* First, check the absolute limit against all pinned pages. */
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if (pinned + npages >= ulimit && !can_lock)
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return false;
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return ((nlocked + npages) <= size) || can_lock;
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}
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int hfi1_acquire_user_pages(struct mm_struct *mm, unsigned long vaddr, size_t npages,
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bool writable, struct page **pages)
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{
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int ret;
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unsigned int gup_flags = FOLL_LONGTERM | (writable ? FOLL_WRITE : 0);
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ret = get_user_pages_fast(vaddr, npages, gup_flags, pages);
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if (ret < 0)
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return ret;
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atomic64_add(ret, &mm->pinned_vm);
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return ret;
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}
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void hfi1_release_user_pages(struct mm_struct *mm, struct page **p,
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size_t npages, bool dirty)
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{
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put_user_pages_dirty_lock(p, npages, dirty);
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if (mm) { /* during close after signal, mm can be NULL */
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atomic64_sub(npages, &mm->pinned_vm);
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}
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}
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