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/* $NetBSD: drm_vma_manager.h,v 1.7 2021/12/19 11:57:27 riastradh Exp $ */
/*-
* Copyright (c) 2014 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Taylor R. Campbell.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _DRM_DRM_VMA_MANAGER_H_
#define _DRM_DRM_VMA_MANAGER_H_
#include <sys/types.h>
#include <sys/param.h>
#include <sys/rbtree.h>
#include <sys/rwlock.h>
#include <sys/vmem.h>
#include <linux/mm.h>
#if BITS_PER_LONG == 64
#define DRM_FILE_PAGE_OFFSET_START ((0xFFFFFFFFUL >> PAGE_SHIFT) + 1)
#define DRM_FILE_PAGE_OFFSET_SIZE ((0xFFFFFFFFUL >> PAGE_SHIFT) * 256)
#else
#define DRM_FILE_PAGE_OFFSET_START ((0xFFFFFFFUL >> PAGE_SHIFT) + 1)
#define DRM_FILE_PAGE_OFFSET_SIZE ((0xFFFFFFFUL >> PAGE_SHIFT) * 16)
#endif
struct drm_file;
struct drm_vma_offset_manager {
krwlock_t vom_lock;
struct rb_tree vom_nodes;
struct vmem *vom_vmem;
};
struct drm_vma_offset_node {
krwlock_t von_lock;
vmem_addr_t von_startpage;
vmem_size_t von_npages;
struct rb_tree von_files;
struct rb_node von_rb_node;
/* Linux API names */
bool readonly;
};
static inline unsigned long
drm_vma_node_start(const struct drm_vma_offset_node *node)
{
return node->von_startpage;
}
static inline unsigned long
drm_vma_node_size(const struct drm_vma_offset_node *node)
{
return node->von_npages;
}
static inline bool
drm_vma_node_has_offset(const struct drm_vma_offset_node *node)
{
return (node->von_npages != 0);
}
static inline uint64_t
drm_vma_node_offset_addr(const struct drm_vma_offset_node *node)
{
return (uint64_t)node->von_startpage << PAGE_SHIFT;
}
struct drm_vma_offset_file {
struct drm_file *vof_file;
struct rb_node vof_rb_node;
};
void drm_vma_offset_manager_init(struct drm_vma_offset_manager *,
unsigned long, unsigned long);
void drm_vma_offset_manager_destroy(struct drm_vma_offset_manager *);
/*
* This is called drm_vma_node_reset upstream. Name is changed so you
* have to find calls and match them with drm_vma_node_destroy.
*/
void drm_vma_node_init(struct drm_vma_offset_node *);
/* This does not exist upstream. */
void drm_vma_node_destroy(struct drm_vma_offset_node *);
int drm_vma_offset_add(struct drm_vma_offset_manager *,
struct drm_vma_offset_node *, unsigned long);
void drm_vma_offset_remove(struct drm_vma_offset_manager *,
struct drm_vma_offset_node *);
void drm_vma_offset_lock_lookup(struct drm_vma_offset_manager *);
void drm_vma_offset_unlock_lookup(struct drm_vma_offset_manager *);
struct drm_vma_offset_node *
drm_vma_offset_lookup_locked(struct drm_vma_offset_manager *,
unsigned long, unsigned long);
struct drm_vma_offset_node *
drm_vma_offset_exact_lookup(struct drm_vma_offset_manager *,
unsigned long, unsigned long);
struct drm_vma_offset_node *
drm_vma_offset_exact_lookup_locked(struct drm_vma_offset_manager *,
unsigned long, unsigned long);
int drm_vma_node_allow(struct drm_vma_offset_node *, struct drm_file *);
void drm_vma_node_revoke(struct drm_vma_offset_node *, struct drm_file *);
bool drm_vma_node_is_allowed(struct drm_vma_offset_node *,
struct drm_file *);
int drm_vma_node_verify_access(struct drm_vma_offset_node *,
struct drm_file *);
#endif /* _DRM_DRM_VMA_MANAGER_H_ */
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