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_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
  45struct ttm_agp_backend {
  46        struct ttm_tt ttm;
  47        struct agp_memory *mem;
  48        struct agp_bridge_data *bridge;
  49};
  50
  51static int ttm_agp_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem)
  52{
  53        struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
  54        struct page *dummy_read_page = ttm->bdev->glob->dummy_read_page;
  55        struct drm_mm_node *node = bo_mem->mm_node;
  56        struct agp_memory *mem;
  57        int ret, cached = (bo_mem->placement & TTM_PL_FLAG_CACHED);
  58        unsigned i;
  59
  60        mem = agp_allocate_memory(agp_be->bridge, ttm->num_pages, AGP_USER_MEMORY);
  61        if (unlikely(mem == NULL))
  62                return -ENOMEM;
  63
  64        mem->page_count = 0;
  65        for (i = 0; i < ttm->num_pages; i++) {
  66                struct page *page = ttm->pages[i];
  67
  68                if (!page)
  69                        page = dummy_read_page;
  70
  71                mem->pages[mem->page_count++] = page;
  72        }
  73        agp_be->mem = mem;
  74
  75        mem->is_flushed = 1;
  76        mem->type = (cached) ? AGP_USER_CACHED_MEMORY : AGP_USER_MEMORY;
  77
  78        ret = agp_bind_memory(mem, node->start);
  79        if (ret)
  80                pr_err("AGP Bind memory failed\n");
  81
  82        return ret;
  83}
  84
  85static int ttm_agp_unbind(struct ttm_tt *ttm)
  86{
  87        struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
  88
  89        if (agp_be->mem) {
  90                if (agp_be->mem->is_bound)
  91                        return agp_unbind_memory(agp_be->mem);
  92                agp_free_memory(agp_be->mem);
  93                agp_be->mem = NULL;
  94        }
  95        return 0;
  96}
  97
  98static void ttm_agp_destroy(struct ttm_tt *ttm)
  99{
 100        struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
 101
 102        if (agp_be->mem)
 103                ttm_agp_unbind(ttm);
 104        ttm_tt_fini(ttm);
 105        kfree(agp_be);
 106}
 107
 108static struct ttm_backend_func ttm_agp_func = {
 109        .bind = ttm_agp_bind,
 110        .unbind = ttm_agp_unbind,
 111        .destroy = ttm_agp_destroy,
 112};
 113
 114struct ttm_tt *ttm_agp_tt_create(struct ttm_buffer_object *bo,
 115                                 struct agp_bridge_data *bridge,
 116                                 uint32_t page_flags)
 117{
 118        struct ttm_agp_backend *agp_be;
 119
 120        agp_be = kmalloc(sizeof(*agp_be), GFP_KERNEL);
 121        if (!agp_be)
 122                return NULL;
 123
 124        agp_be->mem = NULL;
 125        agp_be->bridge = bridge;
 126        agp_be->ttm.func = &ttm_agp_func;
 127
 128        if (ttm_tt_init(&agp_be->ttm, bo, page_flags)) {
 129                kfree(agp_be);
 130                return NULL;
 131        }
 132
 133        return &agp_be->ttm;
 134}
 135EXPORT_SYMBOL(ttm_agp_tt_create);
 136
 137int ttm_agp_tt_populate(struct ttm_tt *ttm, struct ttm_operation_ctx *ctx)
 138{
 139        if (ttm->state != tt_unpopulated)
 140                return 0;
 141
 142        return ttm_pool_populate(ttm, ctx);
 143}
 144EXPORT_SYMBOL(ttm_agp_tt_populate);
 145
 146void ttm_agp_tt_unpopulate(struct ttm_tt *ttm)
 147{
 148        ttm_pool_unpopulate(ttm);
 149}
 150EXPORT_SYMBOL(ttm_agp_tt_unpopulate);
 151