1/* $NetBSD: drm_vma_manager.h,v 1.7 2021/12/19 11:57:27 riastradh Exp $ */ 2 3/*- 4 * Copyright (c) 2014 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Taylor R. Campbell. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32#ifndef _DRM_DRM_VMA_MANAGER_H_ 33#define _DRM_DRM_VMA_MANAGER_H_ 34 35#include <sys/types.h> 36#include <sys/param.h> 37#include <sys/rbtree.h> 38#include <sys/rwlock.h> 39#include <sys/vmem.h> 40 41#include <linux/mm.h> 42 43#if BITS_PER_LONG == 64 44#define DRM_FILE_PAGE_OFFSET_START ((0xFFFFFFFFUL >> PAGE_SHIFT) + 1) 45#define DRM_FILE_PAGE_OFFSET_SIZE ((0xFFFFFFFFUL >> PAGE_SHIFT) * 256) 46#else 47#define DRM_FILE_PAGE_OFFSET_START ((0xFFFFFFFUL >> PAGE_SHIFT) + 1) 48#define DRM_FILE_PAGE_OFFSET_SIZE ((0xFFFFFFFUL >> PAGE_SHIFT) * 16) 49#endif 50 51struct drm_file; 52 53struct drm_vma_offset_manager { 54 krwlock_t vom_lock; 55 struct rb_tree vom_nodes; 56 struct vmem *vom_vmem; 57}; 58 59struct drm_vma_offset_node { 60 krwlock_t von_lock; 61 vmem_addr_t von_startpage; 62 vmem_size_t von_npages; 63 struct rb_tree von_files; 64 struct rb_node von_rb_node; 65 66 /* Linux API names */ 67 bool readonly; 68}; 69 70static inline unsigned long 71drm_vma_node_start(const struct drm_vma_offset_node *node) 72{ 73 return node->von_startpage; 74} 75 76static inline unsigned long 77drm_vma_node_size(const struct drm_vma_offset_node *node) 78{ 79 return node->von_npages; 80} 81 82static inline bool 83drm_vma_node_has_offset(const struct drm_vma_offset_node *node) 84{ 85 return (node->von_npages != 0); 86} 87 88static inline uint64_t 89drm_vma_node_offset_addr(const struct drm_vma_offset_node *node) 90{ 91 return (uint64_t)node->von_startpage << PAGE_SHIFT; 92} 93 94struct drm_vma_offset_file { 95 struct drm_file *vof_file; 96 struct rb_node vof_rb_node; 97}; 98 99void drm_vma_offset_manager_init(struct drm_vma_offset_manager *, 100 unsigned long, unsigned long); 101void drm_vma_offset_manager_destroy(struct drm_vma_offset_manager *); 102 103/* 104 * This is called drm_vma_node_reset upstream. Name is changed so you 105 * have to find calls and match them with drm_vma_node_destroy. 106 */ 107void drm_vma_node_init(struct drm_vma_offset_node *); 108 109/* This does not exist upstream. */ 110void drm_vma_node_destroy(struct drm_vma_offset_node *); 111 112int drm_vma_offset_add(struct drm_vma_offset_manager *, 113 struct drm_vma_offset_node *, unsigned long); 114void drm_vma_offset_remove(struct drm_vma_offset_manager *, 115 struct drm_vma_offset_node *); 116 117void drm_vma_offset_lock_lookup(struct drm_vma_offset_manager *); 118void drm_vma_offset_unlock_lookup(struct drm_vma_offset_manager *); 119struct drm_vma_offset_node * 120 drm_vma_offset_lookup_locked(struct drm_vma_offset_manager *, 121 unsigned long, unsigned long); 122struct drm_vma_offset_node * 123 drm_vma_offset_exact_lookup(struct drm_vma_offset_manager *, 124 unsigned long, unsigned long); 125struct drm_vma_offset_node * 126 drm_vma_offset_exact_lookup_locked(struct drm_vma_offset_manager *, 127 unsigned long, unsigned long); 128 129int drm_vma_node_allow(struct drm_vma_offset_node *, struct drm_file *); 130void drm_vma_node_revoke(struct drm_vma_offset_node *, struct drm_file *); 131bool drm_vma_node_is_allowed(struct drm_vma_offset_node *, 132 struct drm_file *); 133int drm_vma_node_verify_access(struct drm_vma_offset_node *, 134 struct drm_file *); 135 136#endif /* _DRM_DRM_VMA_MANAGER_H_ */ 137