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/pagemap.h> 31 #include <linux/types.h> 32 #include <drm/ttm/ttm_caching.h> 33 #include <drm/ttm/ttm_kmap_iter.h> 34 35 struct ttm_device; 36 struct ttm_tt; 37 struct ttm_resource; 38 struct ttm_buffer_object; 39 struct ttm_operation_ctx; 40 41 /** 42 * struct ttm_tt - This is a structure holding the pages, caching- and aperture 43 * binding status for a buffer object that isn't backed by fixed (VRAM / AGP) 44 * memory. 45 */ 46 struct ttm_tt { 47 /** @pages: Array of pages backing the data. */ 48 struct page **pages; 49 /** 50 * @page_flags: The page flags. 51 * 52 * Supported values: 53 * 54 * TTM_TT_FLAG_SWAPPED: Set by TTM when the pages have been unpopulated 55 * and swapped out by TTM. Calling ttm_tt_populate() will then swap the 56 * pages back in, and unset the flag. Drivers should in general never 57 * need to touch this. 58 * 59 * TTM_TT_FLAG_ZERO_ALLOC: Set if the pages will be zeroed on 60 * allocation. 61 * 62 * TTM_TT_FLAG_EXTERNAL: Set if the underlying pages were allocated 63 * externally, like with dma-buf or userptr. This effectively disables 64 * TTM swapping out such pages. Also important is to prevent TTM from 65 * ever directly mapping these pages. 66 * 67 * Note that enum ttm_bo_type.ttm_bo_type_sg objects will always enable 68 * this flag. 69 * 70 * TTM_TT_FLAG_EXTERNAL_MAPPABLE: Same behaviour as 71 * TTM_TT_FLAG_EXTERNAL, but with the reduced restriction that it is 72 * still valid to use TTM to map the pages directly. This is useful when 73 * implementing a ttm_tt backend which still allocates driver owned 74 * pages underneath(say with shmem). 75 * 76 * Note that since this also implies TTM_TT_FLAG_EXTERNAL, the usage 77 * here should always be: 78 * 79 * page_flags = TTM_TT_FLAG_EXTERNAL | 80 * TTM_TT_FLAG_EXTERNAL_MAPPABLE; 81 * 82 * TTM_TT_FLAG_PRIV_POPULATED: TTM internal only. DO NOT USE. This is 83 * set by TTM after ttm_tt_populate() has successfully returned, and is 84 * then unset when TTM calls ttm_tt_unpopulate(). 85 */ 86 #define TTM_TT_FLAG_SWAPPED BIT(0) 87 #define TTM_TT_FLAG_ZERO_ALLOC BIT(1) 88 #define TTM_TT_FLAG_EXTERNAL BIT(2) 89 #define TTM_TT_FLAG_EXTERNAL_MAPPABLE BIT(3) 90 91 #define TTM_TT_FLAG_PRIV_POPULATED BIT(4) 92 uint32_t page_flags; 93 /** @num_pages: Number of pages in the page array. */ 94 uint32_t num_pages; 95 /** @sg: for SG objects via dma-buf. */ 96 struct sg_table *sg; 97 /** @dma_address: The DMA (bus) addresses of the pages. */ 98 dma_addr_t *dma_address; 99 /** @swap_storage: Pointer to shmem struct file for swap storage. */ 100 struct file *swap_storage; 101 /** 102 * @caching: The current caching state of the pages, see enum 103 * ttm_caching. 104 */ 105 enum ttm_caching caching; 106 }; 107 108 /** 109 * struct ttm_kmap_iter_tt - Specialization of a mappig iterator for a tt. 110 * @base: Embedded struct ttm_kmap_iter providing the usage interface 111 * @tt: Cached struct ttm_tt. 112 * @prot: Cached page protection for mapping. 113 */ 114 struct ttm_kmap_iter_tt { 115 struct ttm_kmap_iter base; 116 struct ttm_tt *tt; 117 pgprot_t prot; 118 }; 119 120 static inline bool ttm_tt_is_populated(struct ttm_tt *tt) 121 { 122 return tt->page_flags & TTM_TT_FLAG_PRIV_POPULATED; 123 } 124 125 /** 126 * ttm_tt_create 127 * 128 * @bo: pointer to a struct ttm_buffer_object 129 * @zero_alloc: true if allocated pages needs to be zeroed 130 * 131 * Make sure we have a TTM structure allocated for the given BO. 132 * No pages are actually allocated. 133 */ 134 int ttm_tt_create(struct ttm_buffer_object *bo, bool zero_alloc); 135 136 /** 137 * ttm_tt_init 138 * 139 * @ttm: The struct ttm_tt. 140 * @bo: The buffer object we create the ttm for. 141 * @page_flags: Page flags as identified by TTM_TT_FLAG_XX flags. 142 * @caching: the desired caching state of the pages 143 * @extra_pages: Extra pages needed for the driver. 144 * 145 * Create a struct ttm_tt to back data with system memory pages. 146 * No pages are actually allocated. 147 * Returns: 148 * NULL: Out of memory. 149 */ 150 int ttm_tt_init(struct ttm_tt *ttm, struct ttm_buffer_object *bo, 151 uint32_t page_flags, enum ttm_caching caching, 152 unsigned long extra_pages); 153 int ttm_sg_tt_init(struct ttm_tt *ttm_dma, struct ttm_buffer_object *bo, 154 uint32_t page_flags, enum ttm_caching caching); 155 156 /** 157 * ttm_tt_fini 158 * 159 * @ttm: the ttm_tt structure. 160 * 161 * Free memory of ttm_tt structure 162 */ 163 void ttm_tt_fini(struct ttm_tt *ttm); 164 165 /** 166 * ttm_tt_destroy: 167 * 168 * @bdev: the ttm_device this object belongs to 169 * @ttm: The struct ttm_tt. 170 * 171 * Unbind, unpopulate and destroy common struct ttm_tt. 172 */ 173 void ttm_tt_destroy(struct ttm_device *bdev, struct ttm_tt *ttm); 174 175 /** 176 * ttm_tt_swapin: 177 * 178 * @ttm: The struct ttm_tt. 179 * 180 * Swap in a previously swap out ttm_tt. 181 */ 182 int ttm_tt_swapin(struct ttm_tt *ttm); 183 int ttm_tt_swapout(struct ttm_device *bdev, struct ttm_tt *ttm, 184 gfp_t gfp_flags); 185 186 /** 187 * ttm_tt_populate - allocate pages for a ttm 188 * 189 * @bdev: the ttm_device this object belongs to 190 * @ttm: Pointer to the ttm_tt structure 191 * @ctx: operation context for populating the tt object. 192 * 193 * Calls the driver method to allocate pages for a ttm 194 */ 195 int ttm_tt_populate(struct ttm_device *bdev, struct ttm_tt *ttm, 196 struct ttm_operation_ctx *ctx); 197 198 /** 199 * ttm_tt_unpopulate - free pages from a ttm 200 * 201 * @bdev: the ttm_device this object belongs to 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_device *bdev, struct ttm_tt *ttm); 207 208 /** 209 * ttm_tt_mark_for_clear - Mark pages for clearing on populate. 210 * 211 * @ttm: Pointer to the ttm_tt structure 212 * 213 * Marks pages for clearing so that the next time the page vector is 214 * populated, the pages will be cleared. 215 */ 216 static inline void ttm_tt_mark_for_clear(struct ttm_tt *ttm) 217 { 218 ttm->page_flags |= TTM_TT_FLAG_ZERO_ALLOC; 219 } 220 221 void ttm_tt_mgr_init(unsigned long num_pages, unsigned long num_dma32_pages); 222 223 struct ttm_kmap_iter *ttm_kmap_iter_tt_init(struct ttm_kmap_iter_tt *iter_tt, 224 struct ttm_tt *tt); 225 unsigned long ttm_tt_pages_limit(void); 226 #if IS_ENABLED(CONFIG_AGP) 227 #include <linux/agp_backend.h> 228 229 /** 230 * ttm_agp_tt_create 231 * 232 * @bo: Buffer object we allocate the ttm for. 233 * @bridge: The agp bridge this device is sitting on. 234 * @page_flags: Page flags as identified by TTM_TT_FLAG_XX flags. 235 * 236 * 237 * Create a TTM backend that uses the indicated AGP bridge as an aperture 238 * for TT memory. This function uses the linux agpgart interface to 239 * bind and unbind memory backing a ttm_tt. 240 */ 241 struct ttm_tt *ttm_agp_tt_create(struct ttm_buffer_object *bo, 242 struct agp_bridge_data *bridge, 243 uint32_t page_flags); 244 int ttm_agp_bind(struct ttm_tt *ttm, struct ttm_resource *bo_mem); 245 void ttm_agp_unbind(struct ttm_tt *ttm); 246 void ttm_agp_destroy(struct ttm_tt *ttm); 247 bool ttm_agp_is_bound(struct ttm_tt *ttm); 248 #endif 249 250 #endif 251