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1/* SPDX-License-Identifier: GPL-2.0 OR MIT */2/**************************************************************************3 *4 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA5 * All Rights Reserved.6 *7 * Permission is hereby granted, free of charge, to any person obtaining a8 * copy of this software and associated documentation files (the9 * "Software"), to deal in the Software without restriction, including10 * without limitation the rights to use, copy, modify, merge, publish,11 * distribute, sub license, and/or sell copies of the Software, and to12 * permit persons to whom the Software is furnished to do so, subject to13 * the following conditions:14 *15 * The above copyright notice and this permission notice (including the16 * next paragraph) shall be included in all copies or substantial portions17 * of the Software.18 *19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,21 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL22 * 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 OR24 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE25 * 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] " fmt34 35#include <drm/ttm/ttm_device.h>36#include <drm/ttm/ttm_tt.h>37#include <drm/ttm/ttm_resource.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 44struct ttm_agp_backend {45 struct ttm_tt ttm;46 struct agp_memory *mem;47 struct agp_bridge_data *bridge;48};49 50int ttm_agp_bind(struct ttm_tt *ttm, struct ttm_resource *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_glob.dummy_read_page;54 struct agp_memory *mem;55 int ret, cached = ttm->caching == ttm_cached;56 unsigned i;57 58 if (agp_be->mem)59 return 0;60 61 mem = agp_allocate_memory(agp_be->bridge, ttm->num_pages, AGP_USER_MEMORY);62 if (unlikely(mem == NULL))63 return -ENOMEM;64 65 mem->page_count = 0;66 for (i = 0; i < ttm->num_pages; i++) {67 struct page *page = ttm->pages[i];68 69 if (!page)70 page = dummy_read_page;71 72 mem->pages[mem->page_count++] = page;73 }74 agp_be->mem = mem;75 76 mem->is_flushed = 1;77 mem->type = (cached) ? AGP_USER_CACHED_MEMORY : AGP_USER_MEMORY;78 79 ret = agp_bind_memory(mem, bo_mem->start);80 if (ret)81 pr_err("AGP Bind memory failed\n");82 83 return ret;84}85EXPORT_SYMBOL(ttm_agp_bind);86 87void ttm_agp_unbind(struct ttm_tt *ttm)88{89 struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);90 91 if (agp_be->mem) {92 if (agp_be->mem->is_bound) {93 agp_unbind_memory(agp_be->mem);94 return;95 }96 agp_free_memory(agp_be->mem);97 agp_be->mem = NULL;98 }99}100EXPORT_SYMBOL(ttm_agp_unbind);101 102bool ttm_agp_is_bound(struct ttm_tt *ttm)103{104 struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);105 106 if (!ttm)107 return false;108 109 return (agp_be->mem != NULL);110}111EXPORT_SYMBOL(ttm_agp_is_bound);112 113void ttm_agp_destroy(struct ttm_tt *ttm)114{115 struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);116 117 if (agp_be->mem)118 ttm_agp_unbind(ttm);119 ttm_tt_fini(ttm);120 kfree(agp_be);121}122EXPORT_SYMBOL(ttm_agp_destroy);123 124struct ttm_tt *ttm_agp_tt_create(struct ttm_buffer_object *bo,125 struct agp_bridge_data *bridge,126 uint32_t page_flags)127{128 struct ttm_agp_backend *agp_be;129 130 agp_be = kmalloc(sizeof(*agp_be), GFP_KERNEL);131 if (!agp_be)132 return NULL;133 134 agp_be->mem = NULL;135 agp_be->bridge = bridge;136 137 if (ttm_tt_init(&agp_be->ttm, bo, page_flags, ttm_write_combined, 0)) {138 kfree(agp_be);139 return NULL;140 }141 142 return &agp_be->ttm;143}144EXPORT_SYMBOL(ttm_agp_tt_create);145