1 /* SPDX-License-Identifier: GPL-2.0 OR MIT */ 2 /************************************************************************** 3 * 4 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA 5 * All Rights Reserved. 6 * 7 * Permission is hereby granted, free of charge, to any person obtaining a 8 * copy of this software and associated documentation files (the 9 * "Software"), to deal in the Software without restriction, including 10 * without limitation the rights to use, copy, modify, merge, publish, 11 * distribute, sub license, and/or sell copies of the Software, and to 12 * permit persons to whom the Software is furnished to do so, subject to 13 * the following conditions: 14 * 15 * The above copyright notice and this permission notice (including the 16 * next paragraph) shall be included in all copies or substantial portions 17 * of the Software. 18 * 19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 21 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL 22 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, 23 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR 24 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE 25 * USE OR OTHER DEALINGS IN THE SOFTWARE. 26 * 27 **************************************************************************/ 28 /* 29 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com> 30 * Keith Packard. 31 */ 32 33 #define pr_fmt(fmt) "[TTM] " fmt 34 35 #include <drm/ttm/ttm_device.h> 36 #include <drm/ttm/ttm_tt.h> 37 #include <drm/ttm/ttm_resource.h> 38 #include <linux/agp_backend.h> 39 #include <linux/module.h> 40 #include <linux/slab.h> 41 #include <linux/io.h> 42 #include <asm/agp.h> 43 44 struct ttm_agp_backend { 45 struct ttm_tt ttm; 46 struct agp_memory *mem; 47 struct agp_bridge_data *bridge; 48 }; 49 50 int ttm_agp_bind(struct ttm_tt *ttm, struct ttm_resource *bo_mem) 51 { 52 STUB(); 53 return -ENOSYS; 54 #ifdef notyet 55 struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm); 56 struct vm_page *dummy_read_page = ttm_glob.dummy_read_page; 57 struct agp_memory *mem; 58 int ret, cached = ttm->caching == ttm_cached; 59 unsigned i; 60 61 if (agp_be->mem) 62 return 0; 63 64 mem = agp_allocate_memory(agp_be->bridge, ttm->num_pages, AGP_USER_MEMORY); 65 if (unlikely(mem == NULL)) 66 return -ENOMEM; 67 68 mem->page_count = 0; 69 for (i = 0; i < ttm->num_pages; i++) { 70 struct vm_page *page = ttm->pages[i]; 71 72 if (!page) 73 page = dummy_read_page; 74 75 mem->pages[mem->page_count++] = page; 76 } 77 agp_be->mem = mem; 78 79 mem->is_flushed = 1; 80 mem->type = (cached) ? AGP_USER_CACHED_MEMORY : AGP_USER_MEMORY; 81 82 ret = agp_bind_memory(mem, bo_mem->start); 83 if (ret) 84 pr_err("AGP Bind memory failed\n"); 85 86 return ret; 87 #endif 88 } 89 EXPORT_SYMBOL(ttm_agp_bind); 90 91 void ttm_agp_unbind(struct ttm_tt *ttm) 92 { 93 STUB(); 94 #ifdef notyet 95 struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm); 96 97 if (agp_be->mem) { 98 if (agp_be->mem->is_bound) { 99 agp_unbind_memory(agp_be->mem); 100 return; 101 } 102 agp_free_memory(agp_be->mem); 103 agp_be->mem = NULL; 104 } 105 #endif 106 } 107 EXPORT_SYMBOL(ttm_agp_unbind); 108 109 bool ttm_agp_is_bound(struct ttm_tt *ttm) 110 { 111 STUB(); 112 return false; 113 #ifdef notyet 114 struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm); 115 116 if (!ttm) 117 return false; 118 119 return (agp_be->bound == 1); 120 #endif 121 } 122 EXPORT_SYMBOL(ttm_agp_is_bound); 123 124 void ttm_agp_destroy(struct ttm_tt *ttm) 125 { 126 STUB(); 127 #ifdef notyet 128 struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm); 129 130 if (agp_be->bound) 131 ttm_agp_unbind(ttm); 132 ttm_tt_fini(ttm); 133 kfree(agp_be); 134 #endif 135 } 136 EXPORT_SYMBOL(ttm_agp_destroy); 137 138 struct ttm_tt *ttm_agp_tt_create(struct ttm_buffer_object *bo, 139 struct agp_bridge_data *bridge, 140 uint32_t page_flags) 141 { 142 struct ttm_agp_backend *agp_be; 143 144 agp_be = kmalloc(sizeof(*agp_be), GFP_KERNEL); 145 if (!agp_be) 146 return NULL; 147 148 agp_be->mem = NULL; 149 agp_be->bridge = bridge; 150 151 if (ttm_tt_init(&agp_be->ttm, bo, page_flags, ttm_write_combined, 0)) { 152 kfree(agp_be); 153 return NULL; 154 } 155 156 return &agp_be->ttm; 157 } 158 EXPORT_SYMBOL(ttm_agp_tt_create); 159