1 /************************************************************************** 2 * 3 * Copyright (c) 2006-2009 Vmware, Inc., Palo Alto, CA., 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 #ifndef _TTM_TT_H_ 28 #define _TTM_TT_H_ 29 30 #include <linux/types.h> 31 32 struct ttm_tt; 33 struct ttm_resource; 34 struct ttm_buffer_object; 35 struct ttm_operation_ctx; 36 37 #define TTM_PAGE_FLAG_WRITE (1 << 3) 38 #define TTM_PAGE_FLAG_SWAPPED (1 << 4) 39 #define TTM_PAGE_FLAG_PERSISTENT_SWAP (1 << 5) 40 #define TTM_PAGE_FLAG_ZERO_ALLOC (1 << 6) 41 #define TTM_PAGE_FLAG_DMA32 (1 << 7) 42 #define TTM_PAGE_FLAG_SG (1 << 8) 43 #define TTM_PAGE_FLAG_NO_RETRY (1 << 9) 44 45 #define TTM_PAGE_FLAG_PRIV_POPULATED (1 << 31) 46 47 enum ttm_caching_state { 48 tt_uncached, 49 tt_wc, 50 tt_cached 51 }; 52 53 /** 54 * struct ttm_tt 55 * 56 * @pages: Array of pages backing the data. 57 * @num_pages: Number of pages in the page array. 58 * @bdev: Pointer to the current struct ttm_bo_device. 59 * @be: Pointer to the ttm backend. 60 * @swap_storage: Pointer to shmem struct file for swap storage. 61 * @caching_state: The current caching state of the pages. 62 * @state: The current binding state of the pages. 63 * 64 * This is a structure holding the pages, caching- and aperture binding 65 * status for a buffer object that isn't backed by fixed (VRAM / AGP) 66 * memory. 67 */ 68 struct ttm_tt { 69 struct page **pages; 70 uint32_t page_flags; 71 unsigned long num_pages; 72 struct sg_table *sg; /* for SG objects via dma-buf */ 73 struct file *swap_storage; 74 enum ttm_caching_state caching_state; 75 }; 76 77 static inline bool ttm_tt_is_populated(struct ttm_tt *tt) 78 { 79 return tt->page_flags & TTM_PAGE_FLAG_PRIV_POPULATED; 80 } 81 82 static inline void ttm_tt_set_unpopulated(struct ttm_tt *tt) 83 { 84 tt->page_flags &= ~TTM_PAGE_FLAG_PRIV_POPULATED; 85 } 86 87 static inline void ttm_tt_set_populated(struct ttm_tt *tt) 88 { 89 tt->page_flags |= TTM_PAGE_FLAG_PRIV_POPULATED; 90 } 91 92 /** 93 * struct ttm_dma_tt 94 * 95 * @ttm: Base ttm_tt struct. 96 * @dma_address: The DMA (bus) addresses of the pages 97 * @pages_list: used by some page allocation backend 98 * 99 * This is a structure holding the pages, caching- and aperture binding 100 * status for a buffer object that isn't backed by fixed (VRAM / AGP) 101 * memory. 102 */ 103 struct ttm_dma_tt { 104 struct ttm_tt ttm; 105 dma_addr_t *dma_address; 106 struct list_head pages_list; 107 }; 108 109 /** 110 * ttm_tt_create 111 * 112 * @bo: pointer to a struct ttm_buffer_object 113 * @zero_alloc: true if allocated pages needs to be zeroed 114 * 115 * Make sure we have a TTM structure allocated for the given BO. 116 * No pages are actually allocated. 117 */ 118 int ttm_tt_create(struct ttm_buffer_object *bo, bool zero_alloc); 119 120 /** 121 * ttm_tt_init 122 * 123 * @ttm: The struct ttm_tt. 124 * @bo: The buffer object we create the ttm for. 125 * @page_flags: Page flags as identified by TTM_PAGE_FLAG_XX flags. 126 * 127 * Create a struct ttm_tt to back data with system memory pages. 128 * No pages are actually allocated. 129 * Returns: 130 * NULL: Out of memory. 131 */ 132 int ttm_tt_init(struct ttm_tt *ttm, struct ttm_buffer_object *bo, 133 uint32_t page_flags); 134 int ttm_dma_tt_init(struct ttm_dma_tt *ttm_dma, struct ttm_buffer_object *bo, 135 uint32_t page_flags); 136 int ttm_sg_tt_init(struct ttm_dma_tt *ttm_dma, struct ttm_buffer_object *bo, 137 uint32_t page_flags); 138 139 /** 140 * ttm_tt_fini 141 * 142 * @ttm: the ttm_tt structure. 143 * 144 * Free memory of ttm_tt structure 145 */ 146 void ttm_tt_fini(struct ttm_tt *ttm); 147 void ttm_dma_tt_fini(struct ttm_dma_tt *ttm_dma); 148 149 /** 150 * ttm_ttm_destroy: 151 * 152 * @ttm: The struct ttm_tt. 153 * 154 * Unbind, unpopulate and destroy common struct ttm_tt. 155 */ 156 void ttm_tt_destroy(struct ttm_bo_device *bdev, struct ttm_tt *ttm); 157 158 /** 159 * ttm_tt_destroy_common: 160 * 161 * Called from driver to destroy common path. 162 */ 163 void ttm_tt_destroy_common(struct ttm_bo_device *bdev, struct ttm_tt *ttm); 164 165 /** 166 * ttm_tt_swapin: 167 * 168 * @ttm: The struct ttm_tt. 169 * 170 * Swap in a previously swap out ttm_tt. 171 */ 172 int ttm_tt_swapin(struct ttm_tt *ttm); 173 174 /** 175 * ttm_tt_set_placement_caching: 176 * 177 * @ttm A struct ttm_tt the backing pages of which will change caching policy. 178 * @placement: Flag indicating the desired caching policy. 179 * 180 * This function will change caching policy of any default kernel mappings of 181 * the pages backing @ttm. If changing from cached to uncached or 182 * write-combined, 183 * all CPU caches will first be flushed to make sure the data of the pages 184 * hit RAM. This function may be very costly as it involves global TLB 185 * and cache flushes and potential page splitting / combining. 186 */ 187 int ttm_tt_set_placement_caching(struct ttm_tt *ttm, uint32_t placement); 188 int ttm_tt_swapout(struct ttm_bo_device *bdev, struct ttm_tt *ttm, struct file *persistent_swap_storage); 189 190 /** 191 * ttm_tt_populate - allocate pages for a ttm 192 * 193 * @ttm: Pointer to the ttm_tt structure 194 * 195 * Calls the driver method to allocate pages for a ttm 196 */ 197 int ttm_tt_populate(struct ttm_bo_device *bdev, struct ttm_tt *ttm, struct ttm_operation_ctx *ctx); 198 199 /** 200 * ttm_tt_unpopulate - free pages from a ttm 201 * 202 * @ttm: Pointer to the ttm_tt structure 203 * 204 * Calls the driver method to free all pages from a ttm 205 */ 206 void ttm_tt_unpopulate(struct ttm_bo_device *bdev, struct ttm_tt *ttm); 207 208 #if IS_ENABLED(CONFIG_AGP) 209 #include <linux/agp_backend.h> 210 211 /** 212 * ttm_agp_tt_create 213 * 214 * @bo: Buffer object we allocate the ttm for. 215 * @bridge: The agp bridge this device is sitting on. 216 * @page_flags: Page flags as identified by TTM_PAGE_FLAG_XX flags. 217 * 218 * 219 * Create a TTM backend that uses the indicated AGP bridge as an aperture 220 * for TT memory. This function uses the linux agpgart interface to 221 * bind and unbind memory backing a ttm_tt. 222 */ 223 struct ttm_tt *ttm_agp_tt_create(struct ttm_buffer_object *bo, 224 struct agp_bridge_data *bridge, 225 uint32_t page_flags); 226 int ttm_agp_bind(struct ttm_tt *ttm, struct ttm_resource *bo_mem); 227 void ttm_agp_unbind(struct ttm_tt *ttm); 228 void ttm_agp_destroy(struct ttm_tt *ttm); 229 bool ttm_agp_is_bound(struct ttm_tt *ttm); 230 #endif 231 232 #endif 233