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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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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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_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)
46 #define TTM_PAGE_FLAG_PRIV_POPULATED (1 << 31)
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.
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)
69 dma_addr_t *dma_address;
70 struct file *swap_storage;
71 enum ttm_caching caching;
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.
80 struct ttm_kmap_iter_tt {
81 struct ttm_kmap_iter base;
86 static inline bool ttm_tt_is_populated(struct ttm_tt *tt)
88 return tt->page_flags & TTM_PAGE_FLAG_PRIV_POPULATED;
94 * @bo: pointer to a struct ttm_buffer_object
95 * @zero_alloc: true if allocated pages needs to be zeroed
97 * Make sure we have a TTM structure allocated for the given BO.
98 * No pages are actually allocated.
100 int ttm_tt_create(struct ttm_buffer_object *bo, bool zero_alloc);
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
110 * Create a struct ttm_tt to back data with system memory pages.
111 * No pages are actually allocated.
113 * NULL: Out of memory.
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);
123 * @ttm: the ttm_tt structure.
125 * Free memory of ttm_tt structure
127 void ttm_tt_fini(struct ttm_tt *ttm);
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);
139 * ttm_tt_destroy_common:
141 * Called from driver to destroy common path.
143 void ttm_tt_destroy_common(struct ttm_device *bdev, struct ttm_tt *ttm);
148 * @ttm: The struct ttm_tt.
150 * Swap in a previously swap out ttm_tt.
152 int ttm_tt_swapin(struct ttm_tt *ttm);
153 int ttm_tt_swapout(struct ttm_device *bdev, struct ttm_tt *ttm,
157 * ttm_tt_populate - allocate pages for a ttm
159 * @ttm: Pointer to the ttm_tt structure
161 * Calls the driver method to allocate pages for a ttm
163 int ttm_tt_populate(struct ttm_device *bdev, struct ttm_tt *ttm, struct ttm_operation_ctx *ctx);
166 * ttm_tt_unpopulate - free pages from a ttm
168 * @ttm: Pointer to the ttm_tt structure
170 * Calls the driver method to free all pages from a ttm
172 void ttm_tt_unpopulate(struct ttm_device *bdev, struct ttm_tt *ttm);
175 * ttm_tt_mark_for_clear - Mark pages for clearing on populate.
177 * @ttm: Pointer to the ttm_tt structure
179 * Marks pages for clearing so that the next time the page vector is
180 * populated, the pages will be cleared.
182 static inline void ttm_tt_mark_for_clear(struct ttm_tt *ttm)
184 ttm->page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
187 void ttm_tt_mgr_init(unsigned long num_pages, unsigned long num_dma32_pages);
189 struct ttm_kmap_iter *ttm_kmap_iter_tt_init(struct ttm_kmap_iter_tt *iter_tt,
192 #if IS_ENABLED(CONFIG_AGP)
193 #include <linux/agp_backend.h>
198 * @bo: Buffer object we allocate the ttm for.
199 * @bridge: The agp bridge this device is sitting on.
200 * @page_flags: Page flags as identified by TTM_PAGE_FLAG_XX flags.
203 * Create a TTM backend that uses the indicated AGP bridge as an aperture
204 * for TT memory. This function uses the linux agpgart interface to
205 * bind and unbind memory backing a ttm_tt.
207 struct ttm_tt *ttm_agp_tt_create(struct ttm_buffer_object *bo,
208 struct agp_bridge_data *bridge,
209 uint32_t page_flags);
210 int ttm_agp_bind(struct ttm_tt *ttm, struct ttm_resource *bo_mem);
211 void ttm_agp_unbind(struct ttm_tt *ttm);
212 void ttm_agp_destroy(struct ttm_tt *ttm);
213 bool ttm_agp_is_bound(struct ttm_tt *ttm);