LXR linux/drivers/gpu/drm/ttm/ttm_agp

   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_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)) {
 138                kfree(agp_be);
 139                return NULL;
 140        }
 141
 142        return &agp_be->ttm;
 143}
 144EXPORT_SYMBOL(ttm_agp_tt_create);
 145