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drm_vma_manager.h revision 1.1.6.2 
      1 /*	$NetBSD: drm_vma_manager.h,v 1.1.6.2 2014/08/20 00:04:21 tls 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