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_module.h> 36 #include <drm/ttm/ttm_bo_driver.h> 37 #include <drm/ttm/ttm_page_alloc.h> 38 #include <drm/ttm/ttm_placement.h> 39 #include <linux/agp_backend.h> 40 #include <linux/module.h> 41 #include <linux/slab.h> 42 #include <linux/io.h> 43 #include <asm/agp.h> 44 45 #include <drm/drm_agpsupport.h> 46 47 struct ttm_agp_backend { 48 struct ttm_tt ttm; 49 int bound; 50 bus_addr_t addr; 51 struct drm_agp_head *agp; 52 }; 53 54 int ttm_agp_bind(struct ttm_tt *ttm, struct ttm_resource *bo_mem) 55 { 56 struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm); 57 struct vm_page *dummy_read_page = ttm_bo_glob.dummy_read_page; 58 struct drm_mm_node *node = bo_mem->mm_node; 59 struct agp_softc *sc = agp_be->agp->agpdev; 60 bus_addr_t addr; 61 // int cached = (bo_mem->placement & TTM_PL_FLAG_CACHED); 62 unsigned i; 63 64 #ifdef notyet 65 if (agp_be->mem) 66 return 0; 67 #endif 68 69 addr = sc->sc_apaddr + (node->start << PAGE_SHIFT); 70 for (i = 0; i < ttm->num_pages; i++) { 71 struct vm_page *page = ttm->pages[i]; 72 73 if (!page) 74 page = dummy_read_page; 75 76 sc->sc_methods->bind_page(sc->sc_chipc, addr, VM_PAGE_TO_PHYS(page), 0); 77 addr += PAGE_SIZE; 78 } 79 agp_flush_cache(); 80 sc->sc_methods->flush_tlb(sc->sc_chipc); 81 agp_be->addr = sc->sc_apaddr + (node->start << PAGE_SHIFT); 82 agp_be->bound = 1; 83 84 return 0; 85 } 86 EXPORT_SYMBOL(ttm_agp_bind); 87 88 void ttm_agp_unbind(struct ttm_tt *ttm) 89 { 90 struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm); 91 struct agp_softc *sc = agp_be->agp->agpdev; 92 bus_addr_t addr; 93 unsigned i; 94 95 if (agp_be->bound) { 96 addr = agp_be->addr; 97 for (i = 0; i < ttm->num_pages; i++) { 98 sc->sc_methods->unbind_page(sc->sc_chipc, addr); 99 addr += PAGE_SIZE; 100 } 101 agp_flush_cache(); 102 sc->sc_methods->flush_tlb(sc->sc_chipc); 103 agp_be->bound = 0; 104 } 105 } 106 EXPORT_SYMBOL(ttm_agp_unbind); 107 108 bool ttm_agp_is_bound(struct ttm_tt *ttm) 109 { 110 struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm); 111 112 if (!ttm) 113 return false; 114 115 return (agp_be->bound == 1); 116 } 117 EXPORT_SYMBOL(ttm_agp_is_bound); 118 119 void ttm_agp_destroy(struct ttm_tt *ttm) 120 { 121 struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm); 122 123 if (agp_be->bound) 124 ttm_agp_unbind(ttm); 125 ttm_tt_fini(ttm); 126 kfree(agp_be); 127 } 128 EXPORT_SYMBOL(ttm_agp_destroy); 129 130 struct ttm_tt *ttm_agp_tt_create(struct ttm_buffer_object *bo, 131 struct drm_agp_head *agp, 132 uint32_t page_flags) 133 { 134 struct ttm_agp_backend *agp_be; 135 136 agp_be = kmalloc(sizeof(*agp_be), GFP_KERNEL); 137 if (!agp_be) 138 return NULL; 139 140 agp_be->bound = 0; 141 agp_be->agp = agp; 142 143 if (ttm_tt_init(&agp_be->ttm, bo, page_flags)) { 144 return NULL; 145 } 146 147 return &agp_be->ttm; 148 } 149 EXPORT_SYMBOL(ttm_agp_tt_create); 150