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
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
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,
22 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
24 * USE OR OTHER DEALINGS IN THE SOFTWARE.
25 *
26 *
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 Hellstr�m <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
53typedef 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} drm_sman_mm_t;
78
79typedef struct drm_memblock_item {
80	struct list_head owner_list;
81	drm_hash_item_t user_hash;
82	void *mm_info;
83	drm_sman_mm_t *mm;
84	struct drm_sman *sman;
85} drm_memblock_item_t;
86
87typedef struct drm_sman {
88	drm_sman_mm_t *mm;
89	int num_managers;
90	drm_open_hash_t owner_hash_tab;
91	drm_open_hash_t user_hash_tab;
92	struct list_head owner_items;
93} drm_sman_t;
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
100extern void drm_sman_takedown(drm_sman_t * 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
115extern int drm_sman_init(drm_sman_t * 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
123extern int drm_sman_set_range(drm_sman_t * 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
132extern int drm_sman_set_manager(drm_sman_t * sman, unsigned int mananger,
133				drm_sman_mm_t * allocator);
134
135/*
136 * Allocate a memory block. Aligment is not implemented yet.
137 */
138
139extern drm_memblock_item_t *drm_sman_alloc(drm_sman_t * 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
148extern int drm_sman_free_key(drm_sman_t * 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
157extern int drm_sman_owner_clean(drm_sman_t * 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
167extern void drm_sman_owner_cleanup(drm_sman_t * sman, unsigned long owner);
168
169/*
170 * Frees all stale memory blocks associated with the memory manager.
171 * See idling above.
172 */
173
174extern void drm_sman_cleanup(drm_sman_t * sman);
175
176#endif
177