/*******************************************************************************
    Copyright (c) 2018 NVIDIA Corporation

    Permission is hereby granted, free of charge, to any person obtaining a copy
    of this software and associated documentation files (the "Software"), to
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    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
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*******************************************************************************/

#ifndef __UVM_POPULATE_PAGEABLE_H__
#define __UVM_POPULATE_PAGEABLE_H__

// Types of permissions to influence the address range population.
// PERMISSIONS_INHERIT will use the permissions of the vma.
// PERMISSIONS_ANY will populate the pages with any permissions allowed by the
// vma. This behaves the same as PERMISSIONS_INHERIT except that write mappings
// are not guaranteed if the vma has VM_WRITE.
// PERMISSIONS_WRITE will populate the pages only if the vma has write access.
// This guarantees write mappings are populated.
typedef enum
{
    UVM_POPULATE_PERMISSIONS_INHERIT,
    UVM_POPULATE_PERMISSIONS_ANY,
    UVM_POPULATE_PERMISSIONS_WRITE,
} uvm_populate_permissions_t;

// Populate the pages of the given vma that overlap with the
// [start:start+length) range. If any of the pages was not populated, we return
// NV_ERR_NO_MEMORY. See the comment below for details on the touch argument.
//
// Locking: vma->vm_mm->mmap_lock must be held in read or write mode
NV_STATUS uvm_populate_pageable_vma(struct vm_area_struct *vma,
                                    unsigned long start,
                                    unsigned long length,
                                    int min_prot,
                                    bool touch,
                                    uvm_populate_permissions_t populate_permissions);

// Populate all the pages in the given range by calling get_user_pages. The
// range must be fully backed by vmas. If any of the pages was not populated, we
// return NV_ERR_NO_MEMORY. The caller can request a touch of the populated
// pages. This can be useful in virtualization environment. See
// uvm_ats_service_fault() for example usage.
//
// Locking: mm->mmap_lock must be held in read or write mode
NV_STATUS uvm_populate_pageable(struct mm_struct *mm,
                                unsigned long start,
                                unsigned long length,
                                int min_prot,
                                bool touch,
                                uvm_populate_permissions_t populate_permissions);
#endif
