319 lines
12 KiB
C
319 lines
12 KiB
C
/*
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* SPDX-FileCopyrightText: Copyright (c) 2016-2023 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
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* SPDX-License-Identifier: MIT
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#ifndef __NV_MM_H__
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#define __NV_MM_H__
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#include "conftest.h"
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#if !defined(NV_VM_FAULT_T_IS_PRESENT)
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typedef int vm_fault_t;
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#endif
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/*
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* pin_user_pages()
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*
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* Presence of pin_user_pages() also implies the presence of unpin-user_page().
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* Both were added in the v5.6.
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*
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* pin_user_pages() was added by commit eddb1c228f79
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* ("mm/gup: introduce pin_user_pages*() and FOLL_PIN") in v5.6.
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*
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* Removed vmas parameter from pin_user_pages() by commit 4c630f307455
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* ("mm/gup: remove vmas parameter from pin_user_pages()") in v6.5.
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*/
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#include <linux/mm.h>
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#include <linux/sched.h>
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/*
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* FreeBSD's pin_user_pages's conftest breaks since pin_user_pages is an inline
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* function. Because it simply maps to get_user_pages, we can just replace
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* NV_PIN_USER_PAGES with NV_GET_USER_PAGES on FreeBSD
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*/
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#if defined(NV_PIN_USER_PAGES_PRESENT) && !defined(NV_BSD)
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#if defined(NV_PIN_USER_PAGES_HAS_ARGS_VMAS)
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#define NV_PIN_USER_PAGES(start, nr_pages, gup_flags, pages) \
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pin_user_pages(start, nr_pages, gup_flags, pages, NULL)
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#else
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#define NV_PIN_USER_PAGES pin_user_pages
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#endif // NV_PIN_USER_PAGES_HAS_ARGS_VMAS
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#define NV_UNPIN_USER_PAGE unpin_user_page
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#else
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#define NV_PIN_USER_PAGES NV_GET_USER_PAGES
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#define NV_UNPIN_USER_PAGE put_page
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#endif // NV_PIN_USER_PAGES_PRESENT
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/*
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* get_user_pages()
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*
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* The 8-argument version of get_user_pages() was deprecated by commit
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* cde70140fed8 ("mm/gup: Overload get_user_pages() functions") in v4.6-rc1.
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* (calling get_user_pages with current and current->mm).
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*
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* Completely moved to the 6 argument version of get_user_pages() by
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* commit c12d2da56d0e ("mm/gup: Remove the macro overload API migration
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* helpers from the get_user*() APIs") in v4.6-rc4.
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*
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* write and force parameters were replaced with gup_flags by
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* commit 768ae309a961 ("mm: replace get_user_pages() write/force parameters
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* with gup_flags") in v4.9.
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*
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* A 7-argument version of get_user_pages was introduced into linux-4.4.y by
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* commit 8e50b8b07f462 ("mm: replace get_user_pages() write/force parameters
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* with gup_flags") which cherry-picked the replacement of the write and
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* force parameters with gup_flags.
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*
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* Removed vmas parameter from get_user_pages() by commit 54d020692b34
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* ("mm/gup: remove unused vmas parameter from get_user_pages()") in v6.5.
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*
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*/
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#if defined(NV_GET_USER_PAGES_HAS_ARGS_FLAGS)
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#define NV_GET_USER_PAGES get_user_pages
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#elif defined(NV_GET_USER_PAGES_HAS_ARGS_FLAGS_VMAS)
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#define NV_GET_USER_PAGES(start, nr_pages, flags, pages) \
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get_user_pages(start, nr_pages, flags, pages, NULL)
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#elif defined(NV_GET_USER_PAGES_HAS_ARGS_TSK_FLAGS_VMAS)
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#define NV_GET_USER_PAGES(start, nr_pages, flags, pages) \
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get_user_pages(current, current->mm, start, nr_pages, flags, pages, NULL)
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#else
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static inline long NV_GET_USER_PAGES(unsigned long start,
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unsigned long nr_pages,
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unsigned int flags,
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struct page **pages)
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{
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int write = flags & FOLL_WRITE;
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int force = flags & FOLL_FORCE;
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#if defined(NV_GET_USER_PAGES_HAS_ARGS_WRITE_FORCE_VMAS)
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return get_user_pages(start, nr_pages, write, force, pages, NULL);
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#else
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// NV_GET_USER_PAGES_HAS_ARGS_TSK_WRITE_FORCE_VMAS
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return get_user_pages(current, current->mm, start, nr_pages, write,
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force, pages, NULL);
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#endif // NV_GET_USER_PAGES_HAS_ARGS_WRITE_FORCE_VMAS
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}
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#endif // NV_GET_USER_PAGES_HAS_ARGS_FLAGS
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/*
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* pin_user_pages_remote()
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*
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* pin_user_pages_remote() was added by commit eddb1c228f79
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* ("mm/gup: introduce pin_user_pages*() and FOLL_PIN") in v5.6.
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*
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* pin_user_pages_remote() removed 'tsk' parameter by commit
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* 64019a2e467a ("mm/gup: remove task_struct pointer for all gup code")
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* in v5.9.
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*
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* Removed unused vmas parameter from pin_user_pages_remote() by commit
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* 0b295316b3a9 ("mm/gup: remove unused vmas parameter from
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* pin_user_pages_remote()") in v6.5.
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*
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*/
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#if defined(NV_PIN_USER_PAGES_REMOTE_PRESENT)
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#if defined(NV_PIN_USER_PAGES_REMOTE_HAS_ARGS_TSK_VMAS)
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#define NV_PIN_USER_PAGES_REMOTE(mm, start, nr_pages, flags, pages, locked) \
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pin_user_pages_remote(NULL, mm, start, nr_pages, flags, pages, NULL, locked)
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#elif defined(NV_PIN_USER_PAGES_REMOTE_HAS_ARGS_VMAS)
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#define NV_PIN_USER_PAGES_REMOTE(mm, start, nr_pages, flags, pages, locked) \
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pin_user_pages_remote(mm, start, nr_pages, flags, pages, NULL, locked)
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#else
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#define NV_PIN_USER_PAGES_REMOTE pin_user_pages_remote
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#endif // NV_PIN_USER_PAGES_REMOTE_HAS_ARGS_TSK_VMAS
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#else
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#define NV_PIN_USER_PAGES_REMOTE NV_GET_USER_PAGES_REMOTE
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#endif // NV_PIN_USER_PAGES_REMOTE_PRESENT
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/*
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* get_user_pages_remote() was added by commit 1e9877902dc7
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* ("mm/gup: Introduce get_user_pages_remote()") in v4.6.
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*
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* Note that get_user_pages_remote() requires the caller to hold a reference on
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* the task_struct (if non-NULL and if this API has tsk argument) and the mm_struct.
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* This will always be true when using current and current->mm. If the kernel passes
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* the driver a vma via driver callback, the kernel holds a reference on vma->vm_mm
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* over that callback.
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*
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* get_user_pages_remote() write/force parameters were replaced
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* with gup_flags by commit 9beae1ea8930 ("mm: replace get_user_pages_remote()
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* write/force parameters with gup_flags") in v4.9.
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*
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* get_user_pages_remote() added 'locked' parameter by commit 5b56d49fc31d
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* ("mm: add locked parameter to get_user_pages_remote()") in v4.10.
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*
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* get_user_pages_remote() removed 'tsk' parameter by
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* commit 64019a2e467a ("mm/gup: remove task_struct pointer for
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* all gup code") in v5.9.
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*
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* Removed vmas parameter from get_user_pages_remote() by commit ca5e863233e8
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* ("mm/gup: remove vmas parameter from get_user_pages_remote()") in v6.5.
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*
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*/
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#if defined(NV_GET_USER_PAGES_REMOTE_PRESENT)
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#if defined(NV_GET_USER_PAGES_REMOTE_HAS_ARGS_FLAGS_LOCKED)
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#define NV_GET_USER_PAGES_REMOTE get_user_pages_remote
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#elif defined(NV_GET_USER_PAGES_REMOTE_HAS_ARGS_FLAGS_LOCKED_VMAS)
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#define NV_GET_USER_PAGES_REMOTE(mm, start, nr_pages, flags, pages, locked) \
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get_user_pages_remote(mm, start, nr_pages, flags, pages, NULL, locked)
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#elif defined(NV_GET_USER_PAGES_REMOTE_HAS_ARGS_TSK_FLAGS_LOCKED_VMAS)
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#define NV_GET_USER_PAGES_REMOTE(mm, start, nr_pages, flags, pages, locked) \
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get_user_pages_remote(NULL, mm, start, nr_pages, flags, pages, NULL, locked)
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#elif defined(NV_GET_USER_PAGES_REMOTE_HAS_ARGS_TSK_FLAGS_VMAS)
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#define NV_GET_USER_PAGES_REMOTE(mm, start, nr_pages, flags, pages, locked) \
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get_user_pages_remote(NULL, mm, start, nr_pages, flags, pages, NULL)
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#else
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// NV_GET_USER_PAGES_REMOTE_HAS_ARGS_TSK_WRITE_FORCE_VMAS
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static inline long NV_GET_USER_PAGES_REMOTE(struct mm_struct *mm,
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unsigned long start,
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unsigned long nr_pages,
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unsigned int flags,
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struct page **pages,
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int *locked)
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{
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int write = flags & FOLL_WRITE;
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int force = flags & FOLL_FORCE;
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return get_user_pages_remote(NULL, mm, start, nr_pages, write, force,
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pages, NULL);
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}
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#endif // NV_GET_USER_PAGES_REMOTE_HAS_ARGS_FLAGS_LOCKED
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#else
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#if defined(NV_GET_USER_PAGES_HAS_ARGS_TSK_WRITE_FORCE_VMAS)
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static inline long NV_GET_USER_PAGES_REMOTE(struct mm_struct *mm,
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unsigned long start,
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unsigned long nr_pages,
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unsigned int flags,
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struct page **pages,
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int *locked)
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{
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int write = flags & FOLL_WRITE;
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int force = flags & FOLL_FORCE;
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return get_user_pages(NULL, mm, start, nr_pages, write, force, pages, NULL);
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}
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#else
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#define NV_GET_USER_PAGES_REMOTE(mm, start, nr_pages, flags, pages, locked) \
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get_user_pages(NULL, mm, start, nr_pages, flags, pages, NULL)
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#endif // NV_GET_USER_PAGES_HAS_ARGS_TSK_WRITE_FORCE_VMAS
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#endif // NV_GET_USER_PAGES_REMOTE_PRESENT
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/*
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* The .virtual_address field was effectively renamed to .address, by these
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* two commits:
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*
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* struct vm_fault: .address was added by:
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* 2016-12-14 82b0f8c39a3869b6fd2a10e180a862248736ec6f
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*
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* struct vm_fault: .virtual_address was removed by:
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* 2016-12-14 1a29d85eb0f19b7d8271923d8917d7b4f5540b3e
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*/
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static inline unsigned long nv_page_fault_va(struct vm_fault *vmf)
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{
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#if defined(NV_VM_FAULT_HAS_ADDRESS)
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return vmf->address;
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#else
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return (unsigned long)(vmf->virtual_address);
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#endif
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}
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static inline void nv_mmap_read_lock(struct mm_struct *mm)
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{
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#if defined(NV_MM_HAS_MMAP_LOCK)
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mmap_read_lock(mm);
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#else
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down_read(&mm->mmap_sem);
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#endif
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}
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static inline void nv_mmap_read_unlock(struct mm_struct *mm)
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{
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#if defined(NV_MM_HAS_MMAP_LOCK)
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mmap_read_unlock(mm);
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#else
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up_read(&mm->mmap_sem);
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#endif
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}
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static inline void nv_mmap_write_lock(struct mm_struct *mm)
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{
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#if defined(NV_MM_HAS_MMAP_LOCK)
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mmap_write_lock(mm);
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#else
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down_write(&mm->mmap_sem);
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#endif
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}
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static inline void nv_mmap_write_unlock(struct mm_struct *mm)
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{
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#if defined(NV_MM_HAS_MMAP_LOCK)
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mmap_write_unlock(mm);
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#else
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up_write(&mm->mmap_sem);
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#endif
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}
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static inline int nv_mm_rwsem_is_locked(struct mm_struct *mm)
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{
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#if defined(NV_MM_HAS_MMAP_LOCK)
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return rwsem_is_locked(&mm->mmap_lock);
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#else
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return rwsem_is_locked(&mm->mmap_sem);
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#endif
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}
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static inline struct rw_semaphore *nv_mmap_get_lock(struct mm_struct *mm)
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{
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#if defined(NV_MM_HAS_MMAP_LOCK)
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return &mm->mmap_lock;
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#else
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return &mm->mmap_sem;
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#endif
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}
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static inline void nv_vm_flags_set(struct vm_area_struct *vma, vm_flags_t flags)
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{
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#if defined(NV_VM_AREA_STRUCT_HAS_CONST_VM_FLAGS)
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vm_flags_set(vma, flags);
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#else
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vma->vm_flags |= flags;
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#endif
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}
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static inline void nv_vm_flags_clear(struct vm_area_struct *vma, vm_flags_t flags)
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{
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#if defined(NV_VM_AREA_STRUCT_HAS_CONST_VM_FLAGS)
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vm_flags_clear(vma, flags);
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#else
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vma->vm_flags &= ~flags;
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#endif
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}
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#endif // __NV_MM_H__
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