drivers/char/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
   7  * copy of this software and associated documentation files (the
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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
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  25  *
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  27  **************************************************************************/
  28 /*
  29  * Simple memory MANager interface that keeps track on allocate regions on a
  30  * per "owner" basis. All regions associated with an "owner" can be released
  31  * with a simple call. Typically if the "owner" exists. The owner is any
  32  * "unsigned long" identifier. Can typically be a pointer to a file private
  33  * struct or a context identifier.
  34  *
  35  * Authors:
  36  * Thomas Hellström <thomas-at-tungstengraphics-dot-com>
  37  */
  38
  39 #ifndef DRM_SMAN_H
  40 #define DRM_SMAN_H
  41
  42 #include "drmP.h"
  43 #include "drm_hashtab.h"
  44
  45 /*
  46  * A class that is an abstration of a simple memory allocator.
  47  * The sman implementation provides a default such allocator
  48  * using the drm_mm.c implementation. But the user can replace it.
  49  * See the SiS implementation, which may use the SiS FB kernel module
  50  * for memory management.
  51  */
  52
  53 struct drm_sman_mm {
  54         /* private info. If allocated, needs to be destroyed by the destroy
  55            function */
  56         void *private;
  57
  58         /* Allocate a memory block with given size and alignment.
  59            Return an opaque reference to the memory block */
  60
  61         void *(*allocate) (void *private, unsigned long size,
  62                            unsigned alignment);
  63
  64         /* Free a memory block. "ref" is the opaque reference that we got from
  65            the "alloc" function */
  66
  67         void (*free) (void *private, void *ref);
  68
  69         /* Free all resources associated with this allocator */
  70
  71         void (*destroy) (void *private);
  72
  73         /* Return a memory offset from the opaque reference returned from the
  74            "alloc" function */
  75
  76         unsigned long (*offset) (void *private, void *ref);
  77 };
  78
  79 struct drm_memblock_item {
  80         struct list_head owner_list;
  81         struct drm_hash_item user_hash;
  82         void *mm_info;
  83         struct drm_sman_mm *mm;
  84         struct drm_sman *sman;
  85 };
  86
  87 struct drm_sman {
  88         struct drm_sman_mm *mm;
  89         int num_managers;
  90         struct drm_open_hash owner_hash_tab;
  91         struct drm_open_hash user_hash_tab;
  92         struct list_head owner_items;
  93 };
  94
  95 /*
  96  * Take down a memory manager. This function should only be called after a
  97  * successful init and after a call to drm_sman_cleanup.
  98  */
  99
 100 extern void drm_sman_takedown(struct drm_sman * sman);
 101
 102 /*
 103  * Allocate structures for a manager.
 104  * num_managers are the number of memory pools to manage. (VRAM, AGP, ....)
 105  * user_order is the log2 of the number of buckets in the user hash table.
 106  *          set this to approximately log2 of the max number of memory regions
 107  *          that will be allocated for _all_ pools together.
 108  * owner_order is the log2 of the number of buckets in the owner hash table.
 109  *          set this to approximately log2 of
 110  *          the number of client file connections that will
 111  *          be using the manager.
 112  *
 113  */
 114
 115 extern int drm_sman_init(struct drm_sman * sman, unsigned int num_managers,
 116                          unsigned int user_order, unsigned int owner_order);
 117
 118 /*
 119  * Initialize a drm_mm.c allocator. Should be called only once for each
 120  * manager unless a customized allogator is used.
 121  */
 122
 123 extern int drm_sman_set_range(struct drm_sman * sman, unsigned int manager,
 124                               unsigned long start, unsigned long size);
 125
 126 /*
 127  * Initialize a customized allocator for one of the managers.
 128  * (See the SiS module). The object pointed to by "allocator" is copied,
 129  * so it can be destroyed after this call.
 130  */
 131
 132 extern int drm_sman_set_manager(struct drm_sman * sman, unsigned int mananger,
 133                                 struct drm_sman_mm * allocator);
 134
 135 /*
 136  * Allocate a memory block. Aligment is not implemented yet.
 137  */
 138
 139 extern struct drm_memblock_item *drm_sman_alloc(struct drm_sman * sman,
 140                                                 unsigned int manager,
 141                                                 unsigned long size,
 142                                                 unsigned alignment,
 143                                                 unsigned long owner);
 144 /*
 145  * Free a memory block identified by its user hash key.
 146  */
 147
 148 extern int drm_sman_free_key(struct drm_sman * sman, unsigned int key);
 149
 150 /*
 151  * returns 1 iff there are no stale memory blocks associated with this owner.
 152  * Typically called to determine if we need to idle the hardware and call
 153  * drm_sman_owner_cleanup. If there are no stale memory blocks, it removes all
 154  * resources associated with owner.
 155  */
 156
 157 extern int drm_sman_owner_clean(struct drm_sman * sman, unsigned long owner);
 158
 159 /*
 160  * Frees all stale memory blocks associated with this owner. Note that this
 161  * requires that the hardware is finished with all blocks, so the graphics engine
 162  * should be idled before this call is made. This function also frees
 163  * any resources associated with "owner" and should be called when owner
 164  * is not going to be referenced anymore.
 165  */
 166
 167 extern void drm_sman_owner_cleanup(struct drm_sman * sman, unsigned long owner);
 168
 169 /*
 170  * Frees all stale memory blocks associated with the memory manager.
 171  * See idling above.
 172  */
 173
 174 extern void drm_sman_cleanup(struct drm_sman * sman);
 175
 176 #endif