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 * $FreeBSD: head/sys/dev/drm2/ttm/ttm_agp_backend.c 247835 2013-03-05 09:49:34Z kib $ 32 */ 33 34 #define pr_fmt(fmt) "[TTM] " fmt 35 36 #include <drm/ttm/ttm_module.h> 37 #include <drm/ttm/ttm_bo_driver.h> 38 #include <drm/ttm/ttm_page_alloc.h> 39 #ifdef TTM_HAS_AGP 40 #include <drm/ttm/ttm_placement.h> 41 42 struct ttm_agp_backend { 43 struct ttm_tt ttm; 44 struct agp_memory *mem; 45 device_t bridge; 46 }; 47 48 static int ttm_agp_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem) 49 { 50 struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm); 51 struct drm_mm_node *node = bo_mem->mm_node; 52 struct agp_memory *mem; 53 int ret, cached = (bo_mem->placement & TTM_PL_FLAG_CACHED); 54 unsigned i; 55 56 mem = agp_alloc_memory(agp_be->bridge, AGP_USER_MEMORY, ttm->num_pages); 57 if (unlikely(mem == NULL)) 58 return -ENOMEM; 59 60 mem->page_count = 0; 61 for (i = 0; i < ttm->num_pages; i++) { 62 vm_page_t page = ttm->pages[i]; 63 64 if (!page) 65 page = ttm->dummy_read_page; 66 67 mem->pages[mem->page_count++] = page; 68 } 69 agp_be->mem = mem; 70 71 mem->is_flushed = 1; 72 mem->type = (cached) ? AGP_USER_CACHED_MEMORY : AGP_USER_MEMORY; 73 74 ret = agp_bind_memory(mem, node->start); 75 if (ret) 76 pr_err("AGP Bind memory failed\n"); 77 78 return ret; 79 } 80 81 static int ttm_agp_unbind(struct ttm_tt *ttm) 82 { 83 struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm); 84 85 if (agp_be->mem) { 86 if (agp_be->mem->is_bound) 87 return agp_unbind_memory(agp_be->mem); 88 agp_free_memory(agp_be->mem); 89 agp_be->mem = NULL; 90 } 91 return 0; 92 } 93 94 static void ttm_agp_destroy(struct ttm_tt *ttm) 95 { 96 struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm); 97 98 if (agp_be->mem) 99 ttm_agp_unbind(ttm); 100 ttm_tt_fini(ttm); 101 kfree(agp_be); 102 } 103 104 static struct ttm_backend_func ttm_agp_func = { 105 .bind = ttm_agp_bind, 106 .unbind = ttm_agp_unbind, 107 .destroy = ttm_agp_destroy, 108 }; 109 110 struct ttm_tt *ttm_agp_tt_create(struct ttm_bo_device *bdev, 111 device_t bridge, 112 unsigned long size, uint32_t page_flags, 113 vm_page_t dummy_read_page) 114 { 115 struct ttm_agp_backend *agp_be; 116 117 agp_be = kmalloc(sizeof(*agp_be), M_DRM, M_WAITOK | M_ZERO); 118 if (!agp_be) 119 return NULL; 120 121 agp_be->mem = NULL; 122 agp_be->bridge = bridge; 123 agp_be->ttm.func = &ttm_agp_func; 124 125 if (ttm_tt_init(&agp_be->ttm, bdev, size, page_flags, dummy_read_page)) { 126 kfree(agp_be); 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