pb_bufmgr.h revision 00ee308ab3e7da2a2939845e0f0a24b8a0925025
1/************************************************************************** 2 * 3 * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas. 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 19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. 21 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR 22 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, 23 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE 24 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 25 * 26 **************************************************************************/ 27 28/** 29 * \file 30 * Buffer management. 31 * 32 * A buffer manager does only one basic thing: it creates buffers. Actually, 33 * "buffer factory" would probably a more accurate description. 34 * 35 * You can chain buffer managers so that you can have a finer grained memory 36 * management and pooling. 37 * 38 * For example, for a simple batch buffer manager you would chain: 39 * - the native buffer manager, which provides DMA memory from the graphics 40 * memory space; 41 * - the pool buffer manager, which keep around a pool of equally sized buffers 42 * to avoid latency associated with the native buffer manager; 43 * - the fenced buffer manager, which will delay buffer destruction until the 44 * the moment the card finishing processing it. 45 * 46 * \author Jose Fonseca <jrfonseca@tungstengraphics.com> 47 */ 48 49#ifndef PB_BUFMGR_H_ 50#define PB_BUFMGR_H_ 51 52 53#include "pipe/p_compiler.h" 54#include "pipe/p_error.h" 55 56 57#ifdef __cplusplus 58extern "C" { 59#endif 60 61 62struct pb_desc; 63struct pipe_buffer; 64 65 66/** 67 * Abstract base class for all buffer managers. 68 */ 69struct pb_manager 70{ 71 void 72 (*destroy)( struct pb_manager *mgr ); 73 74 struct pb_buffer * 75 (*create_buffer)( struct pb_manager *mgr, 76 size_t size, 77 const struct pb_desc *desc); 78 79 /** 80 * Flush all temporary-held buffers. 81 * 82 * Used mostly to aid debugging memory issues or to clean up resources when 83 * the drivers are long lived. 84 */ 85 void 86 (*flush)( struct pb_manager *mgr ); 87}; 88 89 90/** 91 * Malloc buffer provider. 92 * 93 * Simple wrapper around pb_malloc_buffer_create for convenience. 94 */ 95struct pb_manager * 96pb_malloc_bufmgr_create(void); 97 98 99/** 100 * Static buffer pool sub-allocator. 101 * 102 * Manages the allocation of equally sized buffers. It does so by allocating 103 * a single big buffer and divide it equally sized buffers. 104 * 105 * It is meant to manage the allocation of batch buffer pools. 106 */ 107struct pb_manager * 108pool_bufmgr_create(struct pb_manager *provider, 109 size_t n, size_t size, 110 const struct pb_desc *desc); 111 112 113/** 114 * Static sub-allocator based the old memory manager. 115 * 116 * It managers buffers of different sizes. It does so by allocating a buffer 117 * with the size of the heap, and then using the old mm memory manager to manage 118 * that heap. 119 */ 120struct pb_manager * 121mm_bufmgr_create(struct pb_manager *provider, 122 size_t size, size_t align2); 123 124/** 125 * Same as mm_bufmgr_create. 126 * 127 * Buffer will be release when the manager is destroyed. 128 */ 129struct pb_manager * 130mm_bufmgr_create_from_buffer(struct pb_buffer *buffer, 131 size_t size, size_t align2); 132 133 134/** 135 * Slab sub-allocator. 136 */ 137struct pb_manager * 138pb_slab_manager_create(struct pb_manager *provider, 139 size_t bufSize, 140 size_t slabSize, 141 const struct pb_desc *desc); 142 143/** 144 * Allow a range of buffer size, by aggregating multiple slabs sub-allocators 145 * with different bucket sizes. 146 */ 147struct pb_manager * 148pb_slab_range_manager_create(struct pb_manager *provider, 149 size_t minBufSize, 150 size_t maxBufSize, 151 size_t slabSize, 152 const struct pb_desc *desc); 153 154 155/** 156 * Time-based buffer cache. 157 * 158 * This manager keeps a cache of destroyed buffers during a time interval. 159 */ 160struct pb_manager * 161pb_cache_manager_create(struct pb_manager *provider, 162 unsigned usecs); 163 164 165struct pb_fence_ops; 166 167/** 168 * Fenced buffer manager. 169 * 170 * This manager is just meant for convenience. It wraps the buffers returned 171 * by another manager in fenced buffers, so that 172 * 173 * NOTE: the buffer manager that provides the buffers will be destroyed 174 * at the same time. 175 */ 176struct pb_manager * 177fenced_bufmgr_create(struct pb_manager *provider, 178 struct pb_fence_ops *ops); 179 180 181struct pb_manager * 182pb_alt_manager_create(struct pb_manager *provider1, 183 struct pb_manager *provider2); 184 185 186/** 187 * Ondemand buffer manager. 188 * 189 * Buffers are created in malloc'ed memory (fast and cached), and the constents 190 * is transfered to a buffer from the provider (typically in slow uncached 191 * memory) when there is an attempt to validate the buffer. 192 * 193 * Ideal for situations where one does not know before hand whether a given 194 * buffer will effectively be used by the hardware or not. 195 */ 196struct pb_manager * 197pb_ondemand_manager_create(struct pb_manager *provider); 198 199 200/** 201 * Debug buffer manager to detect buffer under- and overflows. 202 * 203 * Band size should be a multiple of the largest alignment 204 */ 205struct pb_manager * 206pb_debug_manager_create(struct pb_manager *provider, size_t band_size); 207 208 209#ifdef __cplusplus 210} 211#endif 212 213#endif /*PB_BUFMGR_H_*/ 214