include/drm/ttm/ttm_tt.h

   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_mem_reg;
  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 enum ttm_caching_state {
  46         tt_uncached,
  47         tt_wc,
  48         tt_cached
  49 };
  50
  51 struct ttm_backend_func {
  52         /**
  53          * struct ttm_backend_func member bind
  54          *
  55          * @ttm: Pointer to a struct ttm_tt.
  56          * @bo_mem: Pointer to a struct ttm_mem_reg describing the
  57          * memory type and location for binding.
  58          *
  59          * Bind the backend pages into the aperture in the location
  60          * indicated by @bo_mem. This function should be able to handle
  61          * differences between aperture and system page sizes.
  62          */
  63         int (*bind) (struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem);
  64
  65         /**
  66          * struct ttm_backend_func member unbind
  67          *
  68          * @ttm: Pointer to a struct ttm_tt.
  69          *
  70          * Unbind previously bound backend pages. This function should be
  71          * able to handle differences between aperture and system page sizes.
  72          */
  73         int (*unbind) (struct ttm_tt *ttm);
  74
  75         /**
  76          * struct ttm_backend_func member destroy
  77          *
  78          * @ttm: Pointer to a struct ttm_tt.
  79          *
  80          * Destroy the backend. This will be call back from ttm_tt_destroy so
  81          * don't call ttm_tt_destroy from the callback or infinite loop.
  82          */
  83         void (*destroy) (struct ttm_tt *ttm);
  84 };
  85
  86 /**
  87  * struct ttm_tt
  88  *
  89  * @bdev: Pointer to a struct ttm_bo_device.
  90  * @func: Pointer to a struct ttm_backend_func that describes
  91  * the backend methods.
  92  * pointer.
  93  * @pages: Array of pages backing the data.
  94  * @num_pages: Number of pages in the page array.
  95  * @bdev: Pointer to the current struct ttm_bo_device.
  96  * @be: Pointer to the ttm backend.
  97  * @swap_storage: Pointer to shmem struct file for swap storage.
  98  * @caching_state: The current caching state of the pages.
  99  * @state: The current binding state of the pages.
 100  *
 101  * This is a structure holding the pages, caching- and aperture binding
 102  * status for a buffer object that isn't backed by fixed (VRAM / AGP)
 103  * memory.
 104  */
 105 struct ttm_tt {
 106         struct ttm_bo_device *bdev;
 107         struct ttm_backend_func *func;
 108         struct page **pages;
 109         uint32_t page_flags;
 110         unsigned long num_pages;
 111         struct sg_table *sg; /* for SG objects via dma-buf */
 112         struct file *swap_storage;
 113         enum ttm_caching_state caching_state;
 114         enum {
 115                 tt_bound,
 116                 tt_unbound,
 117                 tt_unpopulated,
 118         } state;
 119 };
 120
 121 /**
 122  * struct ttm_dma_tt
 123  *
 124  * @ttm: Base ttm_tt struct.
 125  * @dma_address: The DMA (bus) addresses of the pages
 126  * @pages_list: used by some page allocation backend
 127  *
 128  * This is a structure holding the pages, caching- and aperture binding
 129  * status for a buffer object that isn't backed by fixed (VRAM / AGP)
 130  * memory.
 131  */
 132 struct ttm_dma_tt {
 133         struct ttm_tt ttm;
 134         dma_addr_t *dma_address;
 135         struct list_head pages_list;
 136 };
 137
 138 /**
 139  * ttm_tt_create
 140  *
 141  * @bo: pointer to a struct ttm_buffer_object
 142  * @zero_alloc: true if allocated pages needs to be zeroed
 143  *
 144  * Make sure we have a TTM structure allocated for the given BO.
 145  * No pages are actually allocated.
 146  */
 147 int ttm_tt_create(struct ttm_buffer_object *bo, bool zero_alloc);
 148
 149 /**
 150  * ttm_tt_init
 151  *
 152  * @ttm: The struct ttm_tt.
 153  * @bo: The buffer object we create the ttm for.
 154  * @page_flags: Page flags as identified by TTM_PAGE_FLAG_XX flags.
 155  *
 156  * Create a struct ttm_tt to back data with system memory pages.
 157  * No pages are actually allocated.
 158  * Returns:
 159  * NULL: Out of memory.
 160  */
 161 int ttm_tt_init(struct ttm_tt *ttm, struct ttm_buffer_object *bo,
 162                 uint32_t page_flags);
 163 int ttm_dma_tt_init(struct ttm_dma_tt *ttm_dma, struct ttm_buffer_object *bo,
 164                     uint32_t page_flags);
 165 int ttm_sg_tt_init(struct ttm_dma_tt *ttm_dma, struct ttm_buffer_object *bo,
 166                    uint32_t page_flags);
 167
 168 /**
 169  * ttm_tt_fini
 170  *
 171  * @ttm: the ttm_tt structure.
 172  *
 173  * Free memory of ttm_tt structure
 174  */
 175 void ttm_tt_fini(struct ttm_tt *ttm);
 176 void ttm_dma_tt_fini(struct ttm_dma_tt *ttm_dma);
 177
 178 /**
 179  * ttm_ttm_bind:
 180  *
 181  * @ttm: The struct ttm_tt containing backing pages.
 182  * @bo_mem: The struct ttm_mem_reg identifying the binding location.
 183  *
 184  * Bind the pages of @ttm to an aperture location identified by @bo_mem
 185  */
 186 int ttm_tt_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem,
 187                 struct ttm_operation_ctx *ctx);
 188
 189 /**
 190  * ttm_ttm_destroy:
 191  *
 192  * @ttm: The struct ttm_tt.
 193  *
 194  * Unbind, unpopulate and destroy common struct ttm_tt.
 195  */
 196 void ttm_tt_destroy(struct ttm_tt *ttm);
 197
 198 /**
 199  * ttm_ttm_unbind:
 200  *
 201  * @ttm: The struct ttm_tt.
 202  *
 203  * Unbind a struct ttm_tt.
 204  */
 205 void ttm_tt_unbind(struct ttm_tt *ttm);
 206
 207 /**
 208  * ttm_tt_swapin:
 209  *
 210  * @ttm: The struct ttm_tt.
 211  *
 212  * Swap in a previously swap out ttm_tt.
 213  */
 214 int ttm_tt_swapin(struct ttm_tt *ttm);
 215
 216 /**
 217  * ttm_tt_set_placement_caching:
 218  *
 219  * @ttm A struct ttm_tt the backing pages of which will change caching policy.
 220  * @placement: Flag indicating the desired caching policy.
 221  *
 222  * This function will change caching policy of any default kernel mappings of
 223  * the pages backing @ttm. If changing from cached to uncached or
 224  * write-combined,
 225  * all CPU caches will first be flushed to make sure the data of the pages
 226  * hit RAM. This function may be very costly as it involves global TLB
 227  * and cache flushes and potential page splitting / combining.
 228  */
 229 int ttm_tt_set_placement_caching(struct ttm_tt *ttm, uint32_t placement);
 230 int ttm_tt_swapout(struct ttm_tt *ttm, struct file *persistent_swap_storage);
 231
 232 /**
 233  * ttm_tt_populate - allocate pages for a ttm
 234  *
 235  * @ttm: Pointer to the ttm_tt structure
 236  *
 237  * Calls the driver method to allocate pages for a ttm
 238  */
 239 int ttm_tt_populate(struct ttm_tt *ttm, struct ttm_operation_ctx *ctx);
 240
 241 /**
 242  * ttm_tt_unpopulate - free pages from a ttm
 243  *
 244  * @ttm: Pointer to the ttm_tt structure
 245  *
 246  * Calls the driver method to free all pages from a ttm
 247  */
 248 void ttm_tt_unpopulate(struct ttm_tt *ttm);
 249
 250 #if IS_ENABLED(CONFIG_AGP)
 251 #include <linux/agp_backend.h>
 252
 253 /**
 254  * ttm_agp_tt_create
 255  *
 256  * @bo: Buffer object we allocate the ttm for.
 257  * @bridge: The agp bridge this device is sitting on.
 258  * @page_flags: Page flags as identified by TTM_PAGE_FLAG_XX flags.
 259  *
 260  *
 261  * Create a TTM backend that uses the indicated AGP bridge as an aperture
 262  * for TT memory. This function uses the linux agpgart interface to
 263  * bind and unbind memory backing a ttm_tt.
 264  */
 265 struct ttm_tt *ttm_agp_tt_create(struct ttm_buffer_object *bo,
 266                                  struct agp_bridge_data *bridge,
 267                                  uint32_t page_flags);
 268 int ttm_agp_tt_populate(struct ttm_tt *ttm, struct ttm_operation_ctx *ctx);
 269 void ttm_agp_tt_unpopulate(struct ttm_tt *ttm);
 270 #endif
 271
 272 #endif