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33#define pr_fmt(fmt) "[TTM] " fmt
34
35#include <drm/ttm/ttm_module.h>
36#include <drm/ttm/ttm_bo_driver.h>
37#include <drm/ttm/ttm_page_alloc.h>
38#include <drm/ttm/ttm_placement.h>
39#include <linux/agp_backend.h>
40#include <linux/module.h>
41#include <linux/slab.h>
42#include <linux/io.h>
43#include <asm/agp.h>
44
45struct ttm_agp_backend {
46 struct ttm_tt ttm;
47 struct agp_memory *mem;
48 struct agp_bridge_data *bridge;
49};
50
51static int ttm_agp_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem)
52{
53 struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
54 struct page *dummy_read_page = ttm_bo_glob.dummy_read_page;
55 struct drm_mm_node *node = bo_mem->mm_node;
56 struct agp_memory *mem;
57 int ret, cached = (bo_mem->placement & TTM_PL_FLAG_CACHED);
58 unsigned i;
59
60 mem = agp_allocate_memory(agp_be->bridge, ttm->num_pages, AGP_USER_MEMORY);
61 if (unlikely(mem == NULL))
62 return -ENOMEM;
63
64 mem->page_count = 0;
65 for (i = 0; i < ttm->num_pages; i++) {
66 struct page *page = ttm->pages[i];
67
68 if (!page)
69 page = dummy_read_page;
70
71 mem->pages[mem->page_count++] = page;
72 }
73 agp_be->mem = mem;
74
75 mem->is_flushed = 1;
76 mem->type = (cached) ? AGP_USER_CACHED_MEMORY : AGP_USER_MEMORY;
77
78 ret = agp_bind_memory(mem, node->start);
79 if (ret)
80 pr_err("AGP Bind memory failed\n");
81
82 return ret;
83}
84
85static void ttm_agp_unbind(struct ttm_tt *ttm)
86{
87 struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
88
89 if (agp_be->mem) {
90 if (agp_be->mem->is_bound) {
91 agp_unbind_memory(agp_be->mem);
92 return;
93 }
94 agp_free_memory(agp_be->mem);
95 agp_be->mem = NULL;
96 }
97}
98
99static void ttm_agp_destroy(struct ttm_tt *ttm)
100{
101 struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
102
103 if (agp_be->mem)
104 ttm_agp_unbind(ttm);
105 ttm_tt_fini(ttm);
106 kfree(agp_be);
107}
108
109static struct ttm_backend_func ttm_agp_func = {
110 .bind = ttm_agp_bind,
111 .unbind = ttm_agp_unbind,
112 .destroy = ttm_agp_destroy,
113};
114
115struct ttm_tt *ttm_agp_tt_create(struct ttm_buffer_object *bo,
116 struct agp_bridge_data *bridge,
117 uint32_t page_flags)
118{
119 struct ttm_agp_backend *agp_be;
120
121 agp_be = kmalloc(sizeof(*agp_be), GFP_KERNEL);
122 if (!agp_be)
123 return NULL;
124
125 agp_be->mem = NULL;
126 agp_be->bridge = bridge;
127 agp_be->ttm.func = &ttm_agp_func;
128
129 if (ttm_tt_init(&agp_be->ttm, bo, page_flags)) {
130 kfree(agp_be);
131 return NULL;
132 }
133
134 return &agp_be->ttm;
135}
136EXPORT_SYMBOL(ttm_agp_tt_create);
137
138int ttm_agp_tt_populate(struct ttm_tt *ttm, struct ttm_operation_ctx *ctx)
139{
140 if (ttm->state != tt_unpopulated)
141 return 0;
142
143 return ttm_pool_populate(ttm, ctx);
144}
145EXPORT_SYMBOL(ttm_agp_tt_populate);
146
147void ttm_agp_tt_unpopulate(struct ttm_tt *ttm)
148{
149 ttm_pool_unpopulate(ttm);
150}
151EXPORT_SYMBOL(ttm_agp_tt_unpopulate);
152