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