1 /* $NetBSD: drm_vma_manager.h,v 1.1 2014/07/16 20:56:25 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 struct drm_vma_offset_manager { 42 krwlock_t vom_lock; 43 struct rb_tree vom_nodes; 44 struct vmem *vom_vmem; 45 }; 46 47 struct drm_vma_offset_node { 48 krwlock_t von_lock; 49 vmem_addr_t von_startpage; 50 vmem_size_t von_npages; 51 struct rb_tree von_files; 52 struct rb_node von_rb_node; 53 }; 54 55 static inline unsigned long 56 drm_vma_node_start(struct drm_vma_offset_node *node) 57 { 58 return node->von_startpage; 59 } 60 61 static inline unsigned long 62 drm_vma_node_size(struct drm_vma_offset_node *node) 63 { 64 return node->von_npages; 65 } 66 67 static inline bool 68 drm_vma_node_has_offset(struct drm_vma_offset_node *node) 69 { 70 return (node->von_npages != 0); 71 } 72 73 static inline uint64_t 74 drm_vma_node_offset_addr(struct drm_vma_offset_node *node) 75 { 76 return (uint64_t)node->von_startpage << PAGE_SHIFT; 77 } 78 79 struct drm_vma_offset_file { 80 struct file *vof_file; 81 struct rb_node vof_rb_node; 82 }; 83 84 void drm_vma_offset_manager_init(struct drm_vma_offset_manager *, 85 unsigned long, unsigned long); 86 void drm_vma_offset_manager_destroy(struct drm_vma_offset_manager *); 87 88 /* 89 * This is called drm_vma_node_reset upstream. Name is changed so you 90 * have to find calls and match them with drm_vma_node_destroy. 91 */ 92 void drm_vma_node_init(struct drm_vma_offset_node *); 93 94 /* This does not exist upstream. */ 95 void drm_vma_node_destroy(struct drm_vma_offset_node *); 96 97 int drm_vma_offset_add(struct drm_vma_offset_manager *, 98 struct drm_vma_offset_node *, unsigned long); 99 void drm_vma_offset_remove(struct drm_vma_offset_manager *, 100 struct drm_vma_offset_node *); 101 102 void drm_vma_offset_lock_lookup(struct drm_vma_offset_manager *); 103 void drm_vma_offset_unlock_lookup(struct drm_vma_offset_manager *); 104 struct drm_vma_offset_node * 105 drm_vma_offset_lookup_locked(struct drm_vma_offset_manager *, 106 unsigned long, unsigned long); 107 struct drm_vma_offset_node * 108 drm_vma_offset_exact_lookup(struct drm_vma_offset_manager *, 109 unsigned long, unsigned long); 110 111 int drm_vma_node_allow(struct drm_vma_offset_node *, struct file *); 112 void drm_vma_node_revoke(struct drm_vma_offset_node *, struct file *); 113 bool drm_vma_node_is_allowed(struct drm_vma_offset_node *, struct file *); 114 int drm_vma_node_verify_access(struct drm_vma_offset_node *, 115 struct file *); 116 117 #endif /* _DRM_DRM_VMA_MANAGER_H_ */ 118