/*******************************************************************************
    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
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    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.

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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.
//
// flags is the set of UVM_POPULATE_PAGEABLE_FLAG_* values. Only
// UVM_POPULATE_PAGEABLE_FLAG_ALLOW_MANAGED is currently supported.
//
// 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,
                                NvU32 flags);
#endif
