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 #define TTM_PAGE_FLAG_SWAPPED (1 << 4) 42 #define TTM_PAGE_FLAG_ZERO_ALLOC (1 << 6) 43 #define TTM_PAGE_FLAG_SG (1 << 8) 44 #define TTM_PAGE_FLAG_NO_RETRY (1 << 9) 45 46 #define TTM_PAGE_FLAG_PRIV_POPULATED (1 << 31) 47 48 /** 49 * struct ttm_tt 50 * 51 * @pages: Array of pages backing the data. 52 * @page_flags: see TTM_PAGE_FLAG_* 53 * @num_pages: Number of pages in the page array. 54 * @sg: for SG objects via dma-buf 55 * @dma_address: The DMA (bus) addresses of the pages 56 * @swap_storage: Pointer to shmem struct file for swap storage. 57 * @pages_list: used by some page allocation backend 58 * @caching: The current caching state of the pages, see enum ttm_caching. 59 * 60 * This is a structure holding the pages, caching- and aperture binding 61 * status for a buffer object that isn't backed by fixed (VRAM / AGP) 62 * memory. 63 */ 64 struct ttm_tt { 65 struct page **pages; 66 uint32_t page_flags; 67 uint32_t num_pages; 68 struct sg_table *sg; 69 dma_addr_t *dma_address; 70 struct file *swap_storage; 71 enum ttm_caching caching; 72 }; 73 74 /** 75 * struct ttm_kmap_iter_tt - Specialization of a mappig iterator for a tt. 76 * @base: Embedded struct ttm_kmap_iter providing the usage interface 77 * @tt: Cached struct ttm_tt. 78 * @prot: Cached page protection for mapping. 79 */ 80 struct ttm_kmap_iter_tt { 81 struct ttm_kmap_iter base; 82 struct ttm_tt *tt; 83 pgprot_t prot; 84 }; 85 86 static inline bool ttm_tt_is_populated(struct ttm_tt *tt) 87 { 88 return tt->page_flags & TTM_PAGE_FLAG_PRIV_POPULATED; 89 } 90 91 /** 92 * ttm_tt_create 93 * 94 * @bo: pointer to a struct ttm_buffer_object 95 * @zero_alloc: true if allocated pages needs to be zeroed 96 * 97 * Make sure we have a TTM structure allocated for the given BO. 98 * No pages are actually allocated. 99 */ 100 int ttm_tt_create(struct ttm_buffer_object *bo, bool zero_alloc); 101 102 /** 103 * ttm_tt_init 104 * 105 * @ttm: The struct ttm_tt. 106 * @bo: The buffer object we create the ttm for. 107 * @page_flags: Page flags as identified by TTM_PAGE_FLAG_XX flags. 108 * @caching: the desired caching state of the pages 109 * 110 * Create a struct ttm_tt to back data with system memory pages. 111 * No pages are actually allocated. 112 * Returns: 113 * NULL: Out of memory. 114 */ 115 int ttm_tt_init(struct ttm_tt *ttm, struct ttm_buffer_object *bo, 116 uint32_t page_flags, enum ttm_caching caching); 117 int ttm_sg_tt_init(struct ttm_tt *ttm_dma, struct ttm_buffer_object *bo, 118 uint32_t page_flags, enum ttm_caching caching); 119 120 /** 121 * ttm_tt_fini 122 * 123 * @ttm: the ttm_tt structure. 124 * 125 * Free memory of ttm_tt structure 126 */ 127 void ttm_tt_fini(struct ttm_tt *ttm); 128 129 /** 130 * ttm_tt_destroy: 131 * 132 * @bdev: the ttm_device this object belongs to 133 * @ttm: The struct ttm_tt. 134 * 135 * Unbind, unpopulate and destroy common struct ttm_tt. 136 */ 137 void ttm_tt_destroy(struct ttm_device *bdev, struct ttm_tt *ttm); 138 139 /** 140 * ttm_tt_swapin: 141 * 142 * @ttm: The struct ttm_tt. 143 * 144 * Swap in a previously swap out ttm_tt. 145 */ 146 int ttm_tt_swapin(struct ttm_tt *ttm); 147 int ttm_tt_swapout(struct ttm_device *bdev, struct ttm_tt *ttm, 148 gfp_t gfp_flags); 149 150 /** 151 * ttm_tt_populate - allocate pages for a ttm 152 * 153 * @bdev: the ttm_device this object belongs to 154 * @ttm: Pointer to the ttm_tt structure 155 * @ctx: operation context for populating the tt object. 156 * 157 * Calls the driver method to allocate pages for a ttm 158 */ 159 int ttm_tt_populate(struct ttm_device *bdev, struct ttm_tt *ttm, 160 struct ttm_operation_ctx *ctx); 161 162 /** 163 * ttm_tt_unpopulate - free pages from a ttm 164 * 165 * @bdev: the ttm_device this object belongs to 166 * @ttm: Pointer to the ttm_tt structure 167 * 168 * Calls the driver method to free all pages from a ttm 169 */ 170 void ttm_tt_unpopulate(struct ttm_device *bdev, struct ttm_tt *ttm); 171 172 /** 173 * ttm_tt_mark_for_clear - Mark pages for clearing on populate. 174 * 175 * @ttm: Pointer to the ttm_tt structure 176 * 177 * Marks pages for clearing so that the next time the page vector is 178 * populated, the pages will be cleared. 179 */ 180 static inline void ttm_tt_mark_for_clear(struct ttm_tt *ttm) 181 { 182 ttm->page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC; 183 } 184 185 void ttm_tt_mgr_init(unsigned long num_pages, unsigned long num_dma32_pages); 186 187 struct ttm_kmap_iter *ttm_kmap_iter_tt_init(struct ttm_kmap_iter_tt *iter_tt, 188 struct ttm_tt *tt); 189 190 #if IS_ENABLED(CONFIG_AGP) 191 #include <linux/agp_backend.h> 192 193 /** 194 * ttm_agp_tt_create 195 * 196 * @bo: Buffer object we allocate the ttm for. 197 * @bridge: The agp bridge this device is sitting on. 198 * @page_flags: Page flags as identified by TTM_PAGE_FLAG_XX flags. 199 * 200 * 201 * Create a TTM backend that uses the indicated AGP bridge as an aperture 202 * for TT memory. This function uses the linux agpgart interface to 203 * bind and unbind memory backing a ttm_tt. 204 */ 205 struct ttm_tt *ttm_agp_tt_create(struct ttm_buffer_object *bo, 206 struct agp_bridge_data *bridge, 207 uint32_t page_flags); 208 int ttm_agp_bind(struct ttm_tt *ttm, struct ttm_resource *bo_mem); 209 void ttm_agp_unbind(struct ttm_tt *ttm); 210 void ttm_agp_destroy(struct ttm_tt *ttm); 211 bool ttm_agp_is_bound(struct ttm_tt *ttm); 212 #endif 213 214 #endif 215