sys/dev/drm/drm_sman.h

   1 /**************************************************************************
   2  *
   3  * Copyright 2006 Tungsten Graphics, Inc., Bismarck, ND., USA.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
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  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  21  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
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  25  *
  26  *
  27  * __FBSDID("$FreeBSD: src/sys/dev/drm/drm_sman.h,v 1.1 2010/01/31 14:25:29 rnoland Exp $");
  28  **************************************************************************/
  29
  30 /*
  31  * Simple memory MANager interface that keeps track on allocate regions on a
  32  * per "owner" basis. All regions associated with an "owner" can be released
  33  * with a simple call. Typically if the "owner" exists. The owner is any
  34  * "unsigned long" identifier. Can typically be a pointer to a file private
  35  * struct or a context identifier.
  36  *
  37  * Authors:
  38  * Thomas Hellström <thomas-at-tungstengraphics-dot-com>
  39  */
  40
  41 #ifndef DRM_SMAN_H
  42 #define DRM_SMAN_H
  43
  44 #include "dev/drm/drm_hashtab.h"
  45 #include "dev/drm/drm_linux_list.h"
  46 #include "dev/drm/drm_mm.h"
  47
  48 /*
  49  * A class that is an abstration of a simple memory allocator.
  50  * The sman implementation provides a default such allocator
  51  * using the drm_mm.c implementation. But the user can replace it.
  52  * See the SiS implementation, which may use the SiS FB kernel module
  53  * for memory management.
  54  */
  55
  56 struct drm_sman_mm {
  57         /* private info. If allocated, needs to be destroyed by the destroy
  58            function */
  59         void *private;
  60
  61         /* Allocate a memory block with given size and alignment.
  62            Return an opaque reference to the memory block */
  63
  64         void *(*allocate) (void *private, unsigned long size,
  65                            unsigned alignment);
  66
  67         /* Free a memory block. "ref" is the opaque reference that we got from
  68            the "alloc" function */
  69
  70         void (*free) (void *private, void *ref);
  71
  72         /* Free all resources associated with this allocator */
  73
  74         void (*destroy) (void *private);
  75
  76         /* Return a memory offset from the opaque reference returned from the
  77            "alloc" function */
  78
  79         unsigned long (*offset) (void *private, void *ref);
  80 };
  81
  82 struct drm_memblock_item {
  83         struct list_head owner_list;
  84         struct drm_hash_item user_hash;
  85         void *mm_info;
  86         struct drm_sman_mm *mm;
  87         struct drm_sman *sman;
  88 };
  89
  90 struct drm_sman {
  91         struct drm_sman_mm *mm;
  92         int num_managers;
  93         struct drm_open_hash owner_hash_tab;
  94         struct drm_open_hash user_hash_tab;
  95         struct list_head owner_items;
  96 };
  97
  98 /*
  99  * Take down a memory manager. This function should only be called after a
 100  * successful init and after a call to drm_sman_cleanup.
 101  */
 102
 103 extern void drm_sman_takedown(struct drm_sman * sman);
 104
 105 /*
 106  * Allocate structures for a manager.
 107  * num_managers are the number of memory pools to manage. (VRAM, AGP, ....)
 108  * user_order is the log2 of the number of buckets in the user hash table.
 109  *          set this to approximately log2 of the max number of memory regions
 110  *          that will be allocated for _all_ pools together.
 111  * owner_order is the log2 of the number of buckets in the owner hash table.
 112  *          set this to approximately log2 of
 113  *          the number of client file connections that will
 114  *          be using the manager.
 115  *
 116  */
 117
 118 extern int drm_sman_init(struct drm_sman * sman, unsigned int num_managers,
 119                          unsigned int user_order, unsigned int owner_order);
 120
 121 /*
 122  * Initialize a drm_mm.c allocator. Should be called only once for each
 123  * manager unless a customized allogator is used.
 124  */
 125
 126 extern int drm_sman_set_range(struct drm_sman * sman, unsigned int manager,
 127                               unsigned long start, unsigned long size);
 128
 129 /*
 130  * Initialize a customized allocator for one of the managers.
 131  * (See the SiS module). The object pointed to by "allocator" is copied,
 132  * so it can be destroyed after this call.
 133  */
 134
 135 extern int drm_sman_set_manager(struct drm_sman * sman, unsigned int mananger,
 136                                 struct drm_sman_mm * allocator);
 137
 138 /*
 139  * Allocate a memory block. Aligment is not implemented yet.
 140  */
 141
 142 extern struct drm_memblock_item *drm_sman_alloc(struct drm_sman * sman,
 143                                                 unsigned int manager,
 144                                                 unsigned long size,
 145                                                 unsigned alignment,
 146                                                 unsigned long owner);
 147 /*
 148  * Free a memory block identified by its user hash key.
 149  */
 150
 151 extern int drm_sman_free_key(struct drm_sman * sman, unsigned int key);
 152
 153 /*
 154  * returns 1 iff there are no stale memory blocks associated with this owner.
 155  * Typically called to determine if we need to idle the hardware and call
 156  * drm_sman_owner_cleanup. If there are no stale memory blocks, it removes all
 157  * resources associated with owner.
 158  */
 159
 160 extern int drm_sman_owner_clean(struct drm_sman * sman, unsigned long owner);
 161
 162 /*
 163  * Frees all stale memory blocks associated with this owner. Note that this
 164  * requires that the hardware is finished with all blocks, so the graphics engine
 165  * should be idled before this call is made. This function also frees
 166  * any resources associated with "owner" and should be called when owner
 167  * is not going to be referenced anymore.
 168  */
 169
 170 extern void drm_sman_owner_cleanup(struct drm_sman * sman, unsigned long owner);
 171
 172 /*
 173  * Frees all stale memory blocks associated with the memory manager.
 174  * See idling above.
 175  */
 176
 177 extern void drm_sman_cleanup(struct drm_sman * sman);
 178
 179 #endif