/*
* SPDX-FileCopyrightText: Copyright (c) 2016-2017 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
* SPDX-License-Identifier: MIT
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#ifndef __NV_MM_H__
#define __NV_MM_H__
#include "conftest.h"
#if !defined(NV_VM_FAULT_T_IS_PRESENT)
typedef int vm_fault_t;
#endif
/* get_user_pages
*
* The 8-argument version of get_user_pages was deprecated by commit
* (2016 Feb 12: cde70140fed8429acf7a14e2e2cbd3e329036653)for the non-remote case
* (calling get_user_pages with current and current->mm).
*
* Completely moved to the 6 argument version of get_user_pages -
* 2016 Apr 4: c12d2da56d0e07d230968ee2305aaa86b93a6832
*
* write and force parameters were replaced with gup_flags by -
* 2016 Oct 12: 768ae309a96103ed02eb1e111e838c87854d8b51
*
* A 7-argument version of get_user_pages was introduced into linux-4.4.y by
* commit 8e50b8b07f462ab4b91bc1491b1c91bd75e4ad40 which cherry-picked the
* replacement of the write and force parameters with gup_flags
*
*/
#if defined(NV_GET_USER_PAGES_HAS_TASK_STRUCT)
#if defined(NV_GET_USER_PAGES_HAS_WRITE_AND_FORCE_ARGS)
#define NV_GET_USER_PAGES(start, nr_pages, write, force, pages, vmas) \
get_user_pages(current, current->mm, start, nr_pages, write, force, pages, vmas)
#else
#include <linux/mm.h>
#include <linux/sched.h>
static inline long NV_GET_USER_PAGES(unsigned long start,
unsigned long nr_pages,
int write,
int force,
struct page **pages,
struct vm_area_struct **vmas)
{
unsigned int flags = 0;
if (write)
flags |= FOLL_WRITE;
if (force)
flags |= FOLL_FORCE;
return get_user_pages(current, current->mm, start, nr_pages, flags,
pages, vmas);
}
#endif
#else
#if defined(NV_GET_USER_PAGES_HAS_WRITE_AND_FORCE_ARGS)
#define NV_GET_USER_PAGES get_user_pages
#else
#include <linux/mm.h>
static inline long NV_GET_USER_PAGES(unsigned long start,
unsigned long nr_pages,
int write,
int force,
struct page **pages,
struct vm_area_struct **vmas)
{
unsigned int flags = 0;
if (write)
flags |= FOLL_WRITE;
if (force)
flags |= FOLL_FORCE;
return get_user_pages(start, nr_pages, flags, pages, vmas);
}
#endif
#endif
/*
* get_user_pages_remote() was added by commit 1e9877902dc7
* ("mm/gup: Introduce get_user_pages_remote()") in v4.6 (2016-02-12).
*
* The very next commit cde70140fed8 ("mm/gup: Overload get_user_pages()
* functions") deprecated the 8-argument version of get_user_pages for the
* non-remote case (calling get_user_pages with current and current->mm).
*
* The guidelines are: call NV_GET_USER_PAGES_REMOTE if you need the 8-argument
* version that uses something other than current and current->mm. Use
* NV_GET_USER_PAGES if you are refering to current and current->mm.
*
* Note that get_user_pages_remote() requires the caller to hold a reference on
* the task_struct (if non-NULL and if this API has tsk argument) and the mm_struct.
* This will always be true when using current and current->mm. If the kernel passes
* the driver a vma via driver callback, the kernel holds a reference on vma->vm_mm
* over that callback.
*
* get_user_pages_remote() write/force parameters were replaced
* with gup_flags by commit 9beae1ea8930 ("mm: replace get_user_pages_remote()
* write/force parameters with gup_flags") in v4.9 (2016-10-13).
*
* get_user_pages_remote() added 'locked' parameter by commit 5b56d49fc31d
* ("mm: add locked parameter to get_user_pages_remote()") in
* v4.10 (2016-12-14).
*
* get_user_pages_remote() removed 'tsk' parameter by
* commit 64019a2e467a ("mm/gup: remove task_struct pointer for
* all gup code") in v5.9-rc1 (2020-08-11).
*
*/
#if defined(NV_GET_USER_PAGES_REMOTE_PRESENT)
#if defined(NV_GET_USER_PAGES_REMOTE_HAS_WRITE_AND_FORCE_ARGS)
#define NV_GET_USER_PAGES_REMOTE get_user_pages_remote
#else
static inline long NV_GET_USER_PAGES_REMOTE(struct task_struct *tsk,
struct mm_struct *mm,
unsigned long start,
unsigned long nr_pages,
int write,
int force,
struct page **pages,
struct vm_area_struct **vmas)
{
unsigned int flags = 0;
if (write)
flags |= FOLL_WRITE;
if (force)
flags |= FOLL_FORCE;
#if defined(NV_GET_USER_PAGES_REMOTE_HAS_LOCKED_ARG)
#if defined (NV_GET_USER_PAGES_REMOTE_HAS_TSK_ARG)
return get_user_pages_remote(tsk, mm, start, nr_pages, flags,
pages, vmas, NULL);
#else
return get_user_pages_remote(mm, start, nr_pages, flags,
pages, vmas, NULL);
#endif
#else
return get_user_pages_remote(tsk, mm, start, nr_pages, flags,
pages, vmas);
#endif
}
#endif
#else
#if defined(NV_GET_USER_PAGES_HAS_WRITE_AND_FORCE_ARGS)
#define NV_GET_USER_PAGES_REMOTE get_user_pages
#else
#include <linux/mm.h>
#include <linux/sched.h>
static inline long NV_GET_USER_PAGES_REMOTE(struct task_struct *tsk,
struct mm_struct *mm,
unsigned long start,
unsigned long nr_pages,
int write,
int force,
struct page **pages,
struct vm_area_struct **vmas)
{
unsigned int flags = 0;
if (write)
flags |= FOLL_WRITE;
if (force)
flags |= FOLL_FORCE;
return get_user_pages(tsk, mm, start, nr_pages, flags, pages, vmas);
}
#endif
#endif
/*
* The .virtual_address field was effectively renamed to .address, by these
* two commits:
*
* struct vm_fault: .address was added by:
* 2016-12-14 82b0f8c39a3869b6fd2a10e180a862248736ec6f
*
* struct vm_fault: .virtual_address was removed by:
* 2016-12-14 1a29d85eb0f19b7d8271923d8917d7b4f5540b3e
*/
static inline unsigned long nv_page_fault_va(struct vm_fault *vmf)
{
#if defined(NV_VM_FAULT_HAS_ADDRESS)
return vmf->address;
#else
return (unsigned long)(vmf->virtual_address);
#endif
}
static inline void nv_mmap_read_lock(struct mm_struct *mm)
{
#if defined(NV_MM_HAS_MMAP_LOCK)
mmap_read_lock(mm);
#else
down_read(&mm->mmap_sem);
#endif
}
static inline void nv_mmap_read_unlock(struct mm_struct *mm)
{
#if defined(NV_MM_HAS_MMAP_LOCK)
mmap_read_unlock(mm);
#else
up_read(&mm->mmap_sem);
#endif
}
static inline void nv_mmap_write_lock(struct mm_struct *mm)
{
#if defined(NV_MM_HAS_MMAP_LOCK)
mmap_write_lock(mm);
#else
down_write(&mm->mmap_sem);
#endif
}
static inline void nv_mmap_write_unlock(struct mm_struct *mm)
{
#if defined(NV_MM_HAS_MMAP_LOCK)
mmap_write_unlock(mm);
#else
up_write(&mm->mmap_sem);
#endif
}
static inline int nv_mm_rwsem_is_locked(struct mm_struct *mm)
{
#if defined(NV_MM_HAS_MMAP_LOCK)
return rwsem_is_locked(&mm->mmap_lock);
#else
return rwsem_is_locked(&mm->mmap_sem);
#endif
}
static inline struct rw_semaphore *nv_mmap_get_lock(struct mm_struct *mm)
{
#if defined(NV_MM_HAS_MMAP_LOCK)
return &mm->mmap_lock;
#else
return &mm->mmap_sem;
#endif
}
#endif // __NV_MM_H__