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
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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
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18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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26 **************************************************************************/
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>
38 struct ttm_buffer_object;
39 struct ttm_operation_ctx;
41 #define TTM_TT_FLAG_SWAPPED (1 << 0)
42 #define TTM_TT_FLAG_ZERO_ALLOC (1 << 1)
43 #define TTM_TT_FLAG_EXTERNAL (1 << 2)
45 #define TTM_TT_FLAG_PRIV_POPULATED (1 << 31)
50 * @pages: Array of pages backing the data.
51 * @page_flags: see TTM_TT_FLAG_*
52 * @num_pages: Number of pages in the page array.
53 * @sg: for SG objects via dma-buf
54 * @dma_address: The DMA (bus) addresses of the pages
55 * @swap_storage: Pointer to shmem struct file for swap storage.
56 * @pages_list: used by some page allocation backend
57 * @caching: The current caching state of the pages, see enum ttm_caching.
59 * This is a structure holding the pages, caching- and aperture binding
60 * status for a buffer object that isn't backed by fixed (VRAM / AGP)
68 dma_addr_t *dma_address;
69 struct file *swap_storage;
70 enum ttm_caching caching;
74 * struct ttm_kmap_iter_tt - Specialization of a mappig iterator for a tt.
75 * @base: Embedded struct ttm_kmap_iter providing the usage interface
76 * @tt: Cached struct ttm_tt.
77 * @prot: Cached page protection for mapping.
79 struct ttm_kmap_iter_tt {
80 struct ttm_kmap_iter base;
85 static inline bool ttm_tt_is_populated(struct ttm_tt *tt)
87 return tt->page_flags & TTM_TT_FLAG_PRIV_POPULATED;
93 * @bo: pointer to a struct ttm_buffer_object
94 * @zero_alloc: true if allocated pages needs to be zeroed
96 * Make sure we have a TTM structure allocated for the given BO.
97 * No pages are actually allocated.
99 int ttm_tt_create(struct ttm_buffer_object *bo, bool zero_alloc);
104 * @ttm: The struct ttm_tt.
105 * @bo: The buffer object we create the ttm for.
106 * @page_flags: Page flags as identified by TTM_TT_FLAG_XX flags.
107 * @caching: the desired caching state of the pages
109 * Create a struct ttm_tt to back data with system memory pages.
110 * No pages are actually allocated.
112 * NULL: Out of memory.
114 int ttm_tt_init(struct ttm_tt *ttm, struct ttm_buffer_object *bo,
115 uint32_t page_flags, enum ttm_caching caching);
116 int ttm_sg_tt_init(struct ttm_tt *ttm_dma, struct ttm_buffer_object *bo,
117 uint32_t page_flags, enum ttm_caching caching);
122 * @ttm: the ttm_tt structure.
124 * Free memory of ttm_tt structure
126 void ttm_tt_fini(struct ttm_tt *ttm);
131 * @bdev: the ttm_device this object belongs to
132 * @ttm: The struct ttm_tt.
134 * Unbind, unpopulate and destroy common struct ttm_tt.
136 void ttm_tt_destroy(struct ttm_device *bdev, struct ttm_tt *ttm);
141 * @ttm: The struct ttm_tt.
143 * Swap in a previously swap out ttm_tt.
145 int ttm_tt_swapin(struct ttm_tt *ttm);
146 int ttm_tt_swapout(struct ttm_device *bdev, struct ttm_tt *ttm,
150 * ttm_tt_populate - allocate pages for a ttm
152 * @bdev: the ttm_device this object belongs to
153 * @ttm: Pointer to the ttm_tt structure
154 * @ctx: operation context for populating the tt object.
156 * Calls the driver method to allocate pages for a ttm
158 int ttm_tt_populate(struct ttm_device *bdev, struct ttm_tt *ttm,
159 struct ttm_operation_ctx *ctx);
162 * ttm_tt_unpopulate - free pages from a ttm
164 * @bdev: the ttm_device this object belongs to
165 * @ttm: Pointer to the ttm_tt structure
167 * Calls the driver method to free all pages from a ttm
169 void ttm_tt_unpopulate(struct ttm_device *bdev, struct ttm_tt *ttm);
172 * ttm_tt_mark_for_clear - Mark pages for clearing on populate.
174 * @ttm: Pointer to the ttm_tt structure
176 * Marks pages for clearing so that the next time the page vector is
177 * populated, the pages will be cleared.
179 static inline void ttm_tt_mark_for_clear(struct ttm_tt *ttm)
181 ttm->page_flags |= TTM_TT_FLAG_ZERO_ALLOC;
184 void ttm_tt_mgr_init(unsigned long num_pages, unsigned long num_dma32_pages);
186 struct ttm_kmap_iter *ttm_kmap_iter_tt_init(struct ttm_kmap_iter_tt *iter_tt,
189 #if IS_ENABLED(CONFIG_AGP)
190 #include <linux/agp_backend.h>
195 * @bo: Buffer object we allocate the ttm for.
196 * @bridge: The agp bridge this device is sitting on.
197 * @page_flags: Page flags as identified by TTM_TT_FLAG_XX flags.
200 * Create a TTM backend that uses the indicated AGP bridge as an aperture
201 * for TT memory. This function uses the linux agpgart interface to
202 * bind and unbind memory backing a ttm_tt.
204 struct ttm_tt *ttm_agp_tt_create(struct ttm_buffer_object *bo,
205 struct agp_bridge_data *bridge,
206 uint32_t page_flags);
207 int ttm_agp_bind(struct ttm_tt *ttm, struct ttm_resource *bo_mem);
208 void ttm_agp_unbind(struct ttm_tt *ttm);
209 void ttm_agp_destroy(struct ttm_tt *ttm);
210 bool ttm_agp_is_bound(struct ttm_tt *ttm);