1 /**************************************************************************
3 * Copyright (c) 2006-2009 Vmware, Inc., Palo Alto, CA., USA
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:
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
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
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23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
24 * USE OR OTHER DEALINGS IN THE SOFTWARE.
26 **************************************************************************/
30 #include <linux/types.h>
34 struct ttm_buffer_object;
35 struct ttm_operation_ctx;
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)
45 enum ttm_caching_state {
51 struct ttm_backend_func {
53 * struct ttm_backend_func member bind
55 * @ttm: Pointer to a struct ttm_tt.
56 * @bo_mem: Pointer to a struct ttm_resource describing the
57 * memory type and location for binding.
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.
63 int (*bind) (struct ttm_bo_device *bdev, struct ttm_tt *ttm, struct ttm_resource *bo_mem);
66 * struct ttm_backend_func member unbind
68 * @ttm: Pointer to a struct ttm_tt.
70 * Unbind previously bound backend pages. This function should be
71 * able to handle differences between aperture and system page sizes.
73 void (*unbind) (struct ttm_bo_device *bdev, struct ttm_tt *ttm);
76 * struct ttm_backend_func member destroy
78 * @ttm: Pointer to a struct ttm_tt.
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.
83 void (*destroy) (struct ttm_bo_device *bdev, struct ttm_tt *ttm);
89 * @func: Pointer to a struct ttm_backend_func that describes
90 * the backend methods.
92 * @pages: Array of pages backing the data.
93 * @num_pages: Number of pages in the page array.
94 * @bdev: Pointer to the current struct ttm_bo_device.
95 * @be: Pointer to the ttm backend.
96 * @swap_storage: Pointer to shmem struct file for swap storage.
97 * @caching_state: The current caching state of the pages.
98 * @state: The current binding state of the pages.
100 * This is a structure holding the pages, caching- and aperture binding
101 * status for a buffer object that isn't backed by fixed (VRAM / AGP)
105 struct ttm_backend_func *func;
108 unsigned long num_pages;
109 struct sg_table *sg; /* for SG objects via dma-buf */
110 struct file *swap_storage;
111 enum ttm_caching_state caching_state;
122 * @ttm: Base ttm_tt struct.
123 * @dma_address: The DMA (bus) addresses of the pages
124 * @pages_list: used by some page allocation backend
126 * This is a structure holding the pages, caching- and aperture binding
127 * status for a buffer object that isn't backed by fixed (VRAM / AGP)
132 dma_addr_t *dma_address;
133 struct list_head pages_list;
139 * @bo: pointer to a struct ttm_buffer_object
140 * @zero_alloc: true if allocated pages needs to be zeroed
142 * Make sure we have a TTM structure allocated for the given BO.
143 * No pages are actually allocated.
145 int ttm_tt_create(struct ttm_buffer_object *bo, bool zero_alloc);
150 * @ttm: The struct ttm_tt.
151 * @bo: The buffer object we create the ttm for.
152 * @page_flags: Page flags as identified by TTM_PAGE_FLAG_XX flags.
154 * Create a struct ttm_tt to back data with system memory pages.
155 * No pages are actually allocated.
157 * NULL: Out of memory.
159 int ttm_tt_init(struct ttm_tt *ttm, struct ttm_buffer_object *bo,
160 uint32_t page_flags);
161 int ttm_dma_tt_init(struct ttm_dma_tt *ttm_dma, struct ttm_buffer_object *bo,
162 uint32_t page_flags);
163 int ttm_sg_tt_init(struct ttm_dma_tt *ttm_dma, struct ttm_buffer_object *bo,
164 uint32_t page_flags);
169 * @ttm: the ttm_tt structure.
171 * Free memory of ttm_tt structure
173 void ttm_tt_fini(struct ttm_tt *ttm);
174 void ttm_dma_tt_fini(struct ttm_dma_tt *ttm_dma);
179 * @ttm: The struct ttm_tt containing backing pages.
180 * @bo_mem: The struct ttm_resource identifying the binding location.
182 * Bind the pages of @ttm to an aperture location identified by @bo_mem
184 int ttm_tt_bind(struct ttm_bo_device *bdev,
185 struct ttm_tt *ttm, struct ttm_resource *bo_mem,
186 struct ttm_operation_ctx *ctx);
191 * @ttm: The struct ttm_tt.
193 * Unbind, unpopulate and destroy common struct ttm_tt.
195 void ttm_tt_destroy(struct ttm_bo_device *bdev, struct ttm_tt *ttm);
200 * @ttm: The struct ttm_tt.
202 * Unbind a struct ttm_tt.
204 void ttm_tt_unbind(struct ttm_bo_device *bdev, struct ttm_tt *ttm);
209 * @ttm: The struct ttm_tt.
211 * Swap in a previously swap out ttm_tt.
213 int ttm_tt_swapin(struct ttm_tt *ttm);
216 * ttm_tt_set_placement_caching:
218 * @ttm A struct ttm_tt the backing pages of which will change caching policy.
219 * @placement: Flag indicating the desired caching policy.
221 * This function will change caching policy of any default kernel mappings of
222 * the pages backing @ttm. If changing from cached to uncached or
224 * all CPU caches will first be flushed to make sure the data of the pages
225 * hit RAM. This function may be very costly as it involves global TLB
226 * and cache flushes and potential page splitting / combining.
228 int ttm_tt_set_placement_caching(struct ttm_tt *ttm, uint32_t placement);
229 int ttm_tt_swapout(struct ttm_bo_device *bdev, struct ttm_tt *ttm, struct file *persistent_swap_storage);
232 * ttm_tt_populate - allocate pages for a ttm
234 * @ttm: Pointer to the ttm_tt structure
236 * Calls the driver method to allocate pages for a ttm
238 int ttm_tt_populate(struct ttm_bo_device *bdev, struct ttm_tt *ttm, struct ttm_operation_ctx *ctx);
241 * ttm_tt_unpopulate - free pages from a ttm
243 * @ttm: Pointer to the ttm_tt structure
245 * Calls the driver method to free all pages from a ttm
247 void ttm_tt_unpopulate(struct ttm_bo_device *bdev, struct ttm_tt *ttm);
249 #if IS_ENABLED(CONFIG_AGP)
250 #include <linux/agp_backend.h>
255 * @bo: Buffer object we allocate the ttm for.
256 * @bridge: The agp bridge this device is sitting on.
257 * @page_flags: Page flags as identified by TTM_PAGE_FLAG_XX flags.
260 * Create a TTM backend that uses the indicated AGP bridge as an aperture
261 * for TT memory. This function uses the linux agpgart interface to
262 * bind and unbind memory backing a ttm_tt.
264 struct ttm_tt *ttm_agp_tt_create(struct ttm_buffer_object *bo,
265 struct agp_bridge_data *bridge,
266 uint32_t page_flags);
267 int ttm_agp_bind(struct ttm_tt *ttm, struct ttm_resource *bo_mem);
268 void ttm_agp_unbind(struct ttm_tt *ttm);
269 void ttm_agp_destroy(struct ttm_tt *ttm);