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 /* 28 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com> 29 * Keith Packard. 30 */ 31 32 #include "ttm/ttm_module.h" 33 #include "ttm/ttm_bo_driver.h" 34 #include "ttm/ttm_page_alloc.h" 35 #ifdef TTM_HAS_AGP 36 #include "ttm/ttm_placement.h" 37 #include <linux/agp_backend.h> 38 #include <linux/module.h> 39 #include <linux/slab.h> 40 #include <linux/io.h> 41 #include <asm/agp.h> 42 43 struct ttm_agp_backend { 44 struct ttm_tt ttm; 45 struct agp_memory *mem; 46 struct agp_bridge_data *bridge; 47 }; 48 49 static int ttm_agp_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem) 50 { 51 struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm); 52 struct drm_mm_node *node = bo_mem->mm_node; 53 struct agp_memory *mem; 54 int ret, cached = (bo_mem->placement & TTM_PL_FLAG_CACHED); 55 unsigned i; 56 57 mem = agp_allocate_memory(agp_be->bridge, ttm->num_pages, AGP_USER_MEMORY); 58 if (unlikely(mem == NULL)) 59 return -ENOMEM; 60 61 mem->page_count = 0; 62 for (i = 0; i < ttm->num_pages; i++) { 63 struct page *page = ttm->pages[i]; 64 65 if (!page) 66 page = ttm->dummy_read_page; 67 68 mem->pages[mem->page_count++] = page; 69 } 70 agp_be->mem = mem; 71 72 mem->is_flushed = 1; 73 mem->type = (cached) ? AGP_USER_CACHED_MEMORY : AGP_USER_MEMORY; 74 75 ret = agp_bind_memory(mem, node->start); 76 if (ret) 77 printk(KERN_ERR TTM_PFX "AGP Bind memory failed.\n"); 78 79 return ret; 80 } 81 82 static int ttm_agp_unbind(struct ttm_tt *ttm) 83 { 84 struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm); 85 86 if (agp_be->mem) { 87 if (agp_be->mem->is_bound) 88 return agp_unbind_memory(agp_be->mem); 89 agp_free_memory(agp_be->mem); 90 agp_be->mem = NULL; 91 } 92 return 0; 93 } 94 95 static void ttm_agp_destroy(struct ttm_tt *ttm) 96 { 97 struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm); 98 99 if (agp_be->mem) 100 ttm_agp_unbind(ttm); 101 ttm_tt_fini(ttm); 102 kfree(agp_be); 103 } 104 105 static struct ttm_backend_func ttm_agp_func = { 106 .bind = ttm_agp_bind, 107 .unbind = ttm_agp_unbind, 108 .destroy = ttm_agp_destroy, 109 }; 110 111 struct ttm_tt *ttm_agp_tt_create(struct ttm_bo_device *bdev, 112 struct agp_bridge_data *bridge, 113 unsigned long size, uint32_t page_flags, 114 struct page *dummy_read_page) 115 { 116 struct ttm_agp_backend *agp_be; 117 118 agp_be = kmalloc(sizeof(*agp_be), GFP_KERNEL); 119 if (!agp_be) 120 return NULL; 121 122 agp_be->mem = NULL; 123 agp_be->bridge = bridge; 124 agp_be->ttm.func = &ttm_agp_func; 125 126 if (ttm_tt_init(&agp_be->ttm, bdev, size, page_flags, dummy_read_page)) { 127 return NULL; 128 } 129 130 return &agp_be->ttm; 131 } 132 EXPORT_SYMBOL(ttm_agp_tt_create); 133 134 int ttm_agp_tt_populate(struct ttm_tt *ttm) 135 { 136 if (ttm->state != tt_unpopulated) 137 return 0; 138 139 return ttm_pool_populate(ttm); 140 } 141 EXPORT_SYMBOL(ttm_agp_tt_populate); 142 143 void ttm_agp_tt_unpopulate(struct ttm_tt *ttm) 144 { 145 ttm_pool_unpopulate(ttm); 146 } 147 EXPORT_SYMBOL(ttm_agp_tt_unpopulate); 148 149 #endif 150