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

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