1/* $NetBSD: ttm_agp_backend.c,v 1.3 2021/12/18 23:45:44 riastradh Exp $ */ 2 3/* SPDX-License-Identifier: GPL-2.0 OR MIT */ 4/************************************************************************** 5 * 6 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA 7 * All Rights Reserved. 8 * 9 * Permission is hereby granted, free of charge, to any person obtaining a 10 * copy of this software and associated documentation files (the 11 * "Software"), to deal in the Software without restriction, including 12 * without limitation the rights to use, copy, modify, merge, publish, 13 * distribute, sub license, and/or sell copies of the Software, and to 14 * permit persons to whom the Software is furnished to do so, subject to 15 * the following conditions: 16 * 17 * The above copyright notice and this permission notice (including the 18 * next paragraph) shall be included in all copies or substantial portions 19 * of the Software. 20 * 21 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 22 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 23 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL 24 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, 25 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR 26 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE 27 * USE OR OTHER DEALINGS IN THE SOFTWARE. 28 * 29 **************************************************************************/ 30/* 31 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com> 32 * Keith Packard. 33 */ 34 35#include <sys/cdefs.h> 36__KERNEL_RCSID(0, "$NetBSD: ttm_agp_backend.c,v 1.3 2021/12/18 23:45:44 riastradh Exp $"); 37 38#define pr_fmt(fmt) "[TTM] " fmt 39 40#include <drm/ttm/ttm_module.h> 41#include <drm/ttm/ttm_bo_driver.h> 42#include <drm/ttm/ttm_page_alloc.h> 43#include <drm/ttm/ttm_placement.h> 44#include <linux/agp_backend.h> 45#include <linux/module.h> 46#include <linux/slab.h> 47#include <linux/io.h> 48#include <asm/agp.h> 49 50struct ttm_agp_backend { 51 struct ttm_tt ttm; 52 struct agp_memory *mem; 53 struct agp_bridge_data *bridge; 54}; 55 56static int ttm_agp_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem) 57{ 58 struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm); 59 struct page *dummy_read_page = ttm_bo_glob.dummy_read_page; 60 struct drm_mm_node *node = bo_mem->mm_node; 61 struct agp_memory *mem; 62 int ret, cached = (bo_mem->placement & TTM_PL_FLAG_CACHED); 63 unsigned i; 64 65 mem = agp_allocate_memory(agp_be->bridge, ttm->num_pages, AGP_USER_MEMORY); 66 if (unlikely(mem == NULL)) 67 return -ENOMEM; 68 69 mem->page_count = 0; 70 for (i = 0; i < ttm->num_pages; i++) { 71 struct page *page = ttm->pages[i]; 72 73 if (!page) 74 page = dummy_read_page; 75 76 mem->pages[mem->page_count++] = page; 77 } 78 agp_be->mem = mem; 79 80 mem->is_flushed = 1; 81 mem->type = (cached) ? AGP_USER_CACHED_MEMORY : AGP_USER_MEMORY; 82 83 ret = agp_bind_memory(mem, node->start); 84 if (ret) 85 pr_err("AGP Bind memory failed\n"); 86 87 return ret; 88} 89 90static int ttm_agp_unbind(struct ttm_tt *ttm) 91{ 92 struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm); 93 94 if (agp_be->mem) { 95 if (agp_be->mem->is_bound) 96 return agp_unbind_memory(agp_be->mem); 97 agp_free_memory(agp_be->mem); 98 agp_be->mem = NULL; 99 } 100 return 0; 101} 102 103static void ttm_agp_destroy(struct ttm_tt *ttm) 104{ 105 struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm); 106 107 if (agp_be->mem) 108 ttm_agp_unbind(ttm); 109 ttm_tt_fini(ttm); 110 kfree(agp_be); 111} 112 113static struct ttm_backend_func ttm_agp_func = { 114 .bind = ttm_agp_bind, 115 .unbind = ttm_agp_unbind, 116 .destroy = ttm_agp_destroy, 117}; 118 119struct ttm_tt *ttm_agp_tt_create(struct ttm_buffer_object *bo, 120 struct agp_bridge_data *bridge, 121 uint32_t page_flags) 122{ 123 struct ttm_agp_backend *agp_be; 124 125 agp_be = kmalloc(sizeof(*agp_be), GFP_KERNEL); 126 if (!agp_be) 127 return NULL; 128 129 agp_be->mem = NULL; 130 agp_be->bridge = bridge; 131 agp_be->ttm.func = &ttm_agp_func; 132 133 if (ttm_tt_init(&agp_be->ttm, bo, page_flags)) { 134 kfree(agp_be); 135 return NULL; 136 } 137 138 return &agp_be->ttm; 139} 140EXPORT_SYMBOL(ttm_agp_tt_create); 141 142int ttm_agp_tt_populate(struct ttm_tt *ttm, struct ttm_operation_ctx *ctx) 143{ 144 if (ttm->state != tt_unpopulated) 145 return 0; 146 147 return ttm_pool_populate(ttm, ctx); 148} 149EXPORT_SYMBOL(ttm_agp_tt_populate); 150 151void ttm_agp_tt_unpopulate(struct ttm_tt *ttm) 152{ 153 ttm_pool_unpopulate(ttm); 154} 155EXPORT_SYMBOL(ttm_agp_tt_unpopulate); 156