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 struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm); 53 struct page *dummy_read_page = ttm_glob.dummy_read_page; 54 struct agp_memory *mem; 55 int ret, cached = ttm->caching == ttm_cached; 56 unsigned i; 57 58 if (agp_be->mem) 59 return 0; 60 61 mem = agp_allocate_memory(agp_be->bridge, ttm->num_pages, AGP_USER_MEMORY); 62 if (unlikely(mem == NULL)) 63 return -ENOMEM; 64 65 mem->page_count = 0; 66 for (i = 0; i < ttm->num_pages; i++) { 67 struct page *page = ttm->pages[i]; 68 69 if (!page) 70 page = dummy_read_page; 71 72 mem->pages[mem->page_count++] = page; 73 } 74 agp_be->mem = mem; 75 76 mem->is_flushed = 1; 77 mem->type = (cached) ? AGP_USER_CACHED_MEMORY : AGP_USER_MEMORY; 78 79 ret = agp_bind_memory(mem, bo_mem->start); 80 if (ret) 81 pr_err("AGP Bind memory failed\n"); 82 83 return ret; 84 } 85 EXPORT_SYMBOL(ttm_agp_bind); 86 87 void ttm_agp_unbind(struct ttm_tt *ttm) 88 { 89 struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm); 90 91 if (agp_be->mem) { 92 if (agp_be->mem->is_bound) { 93 agp_unbind_memory(agp_be->mem); 94 return; 95 } 96 agp_free_memory(agp_be->mem); 97 agp_be->mem = NULL; 98 } 99 } 100 EXPORT_SYMBOL(ttm_agp_unbind); 101 102 bool ttm_agp_is_bound(struct ttm_tt *ttm) 103 { 104 struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm); 105 106 if (!ttm) 107 return false; 108 109 return (agp_be->mem != NULL); 110 } 111 EXPORT_SYMBOL(ttm_agp_is_bound); 112 113 void ttm_agp_destroy(struct ttm_tt *ttm) 114 { 115 struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm); 116 117 if (agp_be->mem) 118 ttm_agp_unbind(ttm); 119 ttm_tt_fini(ttm); 120 kfree(agp_be); 121 } 122 EXPORT_SYMBOL(ttm_agp_destroy); 123 124 struct ttm_tt *ttm_agp_tt_create(struct ttm_buffer_object *bo, 125 struct agp_bridge_data *bridge, 126 uint32_t page_flags) 127 { 128 struct ttm_agp_backend *agp_be; 129 130 agp_be = kmalloc(sizeof(*agp_be), GFP_KERNEL); 131 if (!agp_be) 132 return NULL; 133 134 agp_be->mem = NULL; 135 agp_be->bridge = bridge; 136 137 if (ttm_tt_init(&agp_be->ttm, bo, page_flags, ttm_write_combined)) { 138 kfree(agp_be); 139 return NULL; 140 } 141 142 return &agp_be->ttm; 143 } 144 EXPORT_SYMBOL(ttm_agp_tt_create); 145