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 #define pr_fmt(fmt) "[TTM] " fmt 33 34 #include <drm/ttm/ttm_module.h> 35 #include <drm/ttm/ttm_bo_driver.h> 36 #include <drm/ttm/ttm_page_alloc.h> 37 #include <drm/ttm/ttm_placement.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 device_t bridge; 48 }; 49 50 static int ttm_agp_bind(struct ttm_tt *ttm, struct ttm_mem_reg *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->bdev->glob->dummy_read_page; 54 struct drm_mm_node *node = bo_mem->mm_node; 55 struct agp_memory *mem; 56 int ret, cached = (bo_mem->placement & TTM_PL_FLAG_CACHED); 57 unsigned i; 58 59 mem = agp_alloc_memory(agp_be->bridge, AGP_USER_MEMORY, ttm->num_pages); 60 if (unlikely(mem == NULL)) 61 return -ENOMEM; 62 63 mem->page_count = 0; 64 for (i = 0; i < ttm->num_pages; i++) { 65 struct page *page = ttm->pages[i]; 66 67 if (!page) 68 page = dummy_read_page; 69 70 mem->pages[mem->page_count++] = page; 71 } 72 agp_be->mem = mem; 73 74 mem->is_flushed = 1; 75 mem->type = (cached) ? AGP_USER_CACHED_MEMORY : AGP_USER_MEMORY; 76 77 ret = agp_bind_memory(mem, node->start); 78 if (ret) 79 pr_err("AGP Bind memory failed\n"); 80 81 return ret; 82 } 83 84 static int ttm_agp_unbind(struct ttm_tt *ttm) 85 { 86 struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm); 87 88 if (agp_be->mem) { 89 if (agp_be->mem->is_bound) 90 return agp_unbind_memory(agp_be->mem); 91 agp_free_memory(agp_be->mem); 92 agp_be->mem = NULL; 93 } 94 return 0; 95 } 96 97 static void ttm_agp_destroy(struct ttm_tt *ttm) 98 { 99 struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm); 100 101 if (agp_be->mem) 102 ttm_agp_unbind(ttm); 103 ttm_tt_fini(ttm); 104 kfree(agp_be); 105 } 106 107 static struct ttm_backend_func ttm_agp_func = { 108 .bind = ttm_agp_bind, 109 .unbind = ttm_agp_unbind, 110 .destroy = ttm_agp_destroy, 111 }; 112 113 struct ttm_tt *ttm_agp_tt_create(struct ttm_buffer_object *bo, 114 device_t bridge, 115 uint32_t page_flags) 116 { 117 struct ttm_agp_backend *agp_be; 118 119 agp_be = kmalloc(sizeof(*agp_be), M_DRM, M_WAITOK); 120 if (!agp_be) 121 return NULL; 122 123 agp_be->mem = NULL; 124 agp_be->bridge = bridge; 125 agp_be->ttm.func = &ttm_agp_func; 126 127 if (ttm_tt_init(&agp_be->ttm, bo, page_flags)) { 128 kfree(agp_be); 129 return NULL; 130 } 131 132 return &agp_be->ttm; 133 } 134 EXPORT_SYMBOL(ttm_agp_tt_create); 135 136 int ttm_agp_tt_populate(struct ttm_tt *ttm, struct ttm_operation_ctx *ctx) 137 { 138 if (ttm->state != tt_unpopulated) 139 return 0; 140 141 return ttm_pool_populate(ttm, ctx); 142 } 143 EXPORT_SYMBOL(ttm_agp_tt_populate); 144 145 void ttm_agp_tt_unpopulate(struct ttm_tt *ttm) 146 { 147 ttm_pool_unpopulate(ttm); 148 } 149 EXPORT_SYMBOL(ttm_agp_tt_unpopulate); 150