1 /* $OpenBSD: ttm_agp_backend.c,v 1.3 2014/02/09 10:57:26 jsg Exp $ */ 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 <dev/pci/drm/ttm/ttm_module.h> 36 #include <dev/pci/drm/ttm/ttm_bo_driver.h> 37 #include <dev/pci/drm/ttm/ttm_page_alloc.h> 38 #ifdef TTM_HAS_AGP 39 #include <dev/pci/drm/ttm/ttm_placement.h> 40 41 struct ttm_agp_backend { 42 struct ttm_tt ttm; 43 int bound; 44 bus_addr_t addr; 45 struct drm_agp_head *agp; 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_softc *sc = agp_be->agp->agpdev; 53 bus_addr_t addr; 54 // int cached = (bo_mem->placement & TTM_PL_FLAG_CACHED); 55 unsigned i; 56 57 addr = sc->sc_apaddr + (node->start << PAGE_SHIFT); 58 for (i = 0; i < ttm->num_pages; i++) { 59 struct vm_page *page = ttm->pages[i]; 60 61 if (!page) 62 page = ttm->dummy_read_page; 63 64 sc->sc_methods->bind_page(sc->sc_chipc, addr, VM_PAGE_TO_PHYS(page), 0); 65 addr += PAGE_SIZE; 66 } 67 agp_flush_cache(); 68 sc->sc_methods->flush_tlb(sc->sc_chipc); 69 agp_be->addr = sc->sc_apaddr + (node->start << PAGE_SHIFT); 70 agp_be->bound = 1; 71 72 return 0; 73 } 74 75 static int ttm_agp_unbind(struct ttm_tt *ttm) 76 { 77 struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm); 78 struct agp_softc *sc = agp_be->agp->agpdev; 79 bus_addr_t addr; 80 unsigned i; 81 82 if (agp_be->bound) { 83 addr = agp_be->addr; 84 for (i = 0; i < ttm->num_pages; i++) { 85 sc->sc_methods->unbind_page(sc->sc_chipc, addr); 86 addr += PAGE_SIZE; 87 } 88 agp_flush_cache(); 89 sc->sc_methods->flush_tlb(sc->sc_chipc); 90 agp_be->bound = 0; 91 } 92 return 0; 93 } 94 95 static void ttm_agp_destroy(struct ttm_tt *ttm) 96 { 97 struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm); 98 99 if (agp_be->bound) 100 ttm_agp_unbind(ttm); 101 ttm_tt_fini(ttm); 102 kfree(agp_be); 103 } 104 105 static struct ttm_backend_func ttm_agp_func = { 106 .bind = ttm_agp_bind, 107 .unbind = ttm_agp_unbind, 108 .destroy = ttm_agp_destroy, 109 }; 110 111 struct ttm_tt *ttm_agp_tt_create(struct ttm_bo_device *bdev, 112 struct drm_agp_head *agp, 113 unsigned long size, uint32_t page_flags, 114 struct vm_page *dummy_read_page) 115 { 116 struct ttm_agp_backend *agp_be; 117 118 agp_be = kmalloc(sizeof(*agp_be), GFP_KERNEL); 119 if (!agp_be) 120 return NULL; 121 122 agp_be->bound = 0; 123 agp_be->agp = agp; 124 agp_be->ttm.func = &ttm_agp_func; 125 126 if (ttm_tt_init(&agp_be->ttm, bdev, size, page_flags, dummy_read_page)) { 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