drivers/gpu/drm/ttm/ttm_agp_backend.c

   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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  25  *
  26  **************************************************************************/
  27 /*
  28  * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
  29  *          Keith Packard.
  30  */
  31
  32 #include "ttm/ttm_module.h"
  33 #include "ttm/ttm_bo_driver.h"
  34 #include "ttm/ttm_page_alloc.h"
  35 #ifdef TTM_HAS_AGP
  36 #include "ttm/ttm_placement.h"
  37 #include <linux/agp_backend.h>
  38 #include <linux/module.h>
  39 #include <linux/slab.h>
  40 #include <linux/io.h>
  41 #include <asm/agp.h>
  42
  43 struct ttm_agp_backend {
  44         struct ttm_tt ttm;
  45         struct agp_memory *mem;
  46         struct agp_bridge_data *bridge;
  47 };
  48
  49 static int ttm_agp_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem)
  50 {
  51         struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
  52         struct drm_mm_node *node = bo_mem->mm_node;
  53         struct agp_memory *mem;
  54         int ret, cached = (bo_mem->placement & TTM_PL_FLAG_CACHED);
  55         unsigned i;
  56
  57         mem = agp_allocate_memory(agp_be->bridge, ttm->num_pages, AGP_USER_MEMORY);
  58         if (unlikely(mem == NULL))
  59                 return -ENOMEM;
  60
  61         mem->page_count = 0;
  62         for (i = 0; i < ttm->num_pages; i++) {
  63                 struct page *page = ttm->pages[i];
  64
  65                 if (!page)
  66                         page = ttm->dummy_read_page;
  67
  68                 mem->pages[mem->page_count++] = page;
  69         }
  70         agp_be->mem = mem;
  71
  72         mem->is_flushed = 1;
  73         mem->type = (cached) ? AGP_USER_CACHED_MEMORY : AGP_USER_MEMORY;
  74
  75         ret = agp_bind_memory(mem, node->start);
  76         if (ret)
  77                 printk(KERN_ERR TTM_PFX "AGP Bind memory failed.\n");
  78
  79         return ret;
  80 }
  81
  82 static int ttm_agp_unbind(struct ttm_tt *ttm)
  83 {
  84         struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
  85
  86         if (agp_be->mem) {
  87                 if (agp_be->mem->is_bound)
  88                         return agp_unbind_memory(agp_be->mem);
  89                 agp_free_memory(agp_be->mem);
  90                 agp_be->mem = NULL;
  91         }
  92         return 0;
  93 }
  94
  95 static void ttm_agp_destroy(struct ttm_tt *ttm)
  96 {
  97         struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
  98
  99         if (agp_be->mem)
 100                 ttm_agp_unbind(ttm);
 101         ttm_tt_fini(ttm);
 102         kfree(agp_be);
 103 }
 104
 105 static struct ttm_backend_func ttm_agp_func = {
 106         .bind = ttm_agp_bind,
 107         .unbind = ttm_agp_unbind,
 108         .destroy = ttm_agp_destroy,
 109 };
 110
 111 struct ttm_tt *ttm_agp_tt_create(struct ttm_bo_device *bdev,
 112                                  struct agp_bridge_data *bridge,
 113                                  unsigned long size, uint32_t page_flags,
 114                                  struct page *dummy_read_page)
 115 {
 116         struct ttm_agp_backend *agp_be;
 117
 118         agp_be = kmalloc(sizeof(*agp_be), GFP_KERNEL);
 119         if (!agp_be)
 120                 return NULL;
 121
 122         agp_be->mem = NULL;
 123         agp_be->bridge = bridge;
 124         agp_be->ttm.func = &ttm_agp_func;
 125
 126         if (ttm_tt_init(&agp_be->ttm, bdev, size, page_flags, dummy_read_page)) {
 127                 return NULL;
 128         }
 129
 130         return &agp_be->ttm;
 131 }
 132 EXPORT_SYMBOL(ttm_agp_tt_create);
 133
 134 int ttm_agp_tt_populate(struct ttm_tt *ttm)
 135 {
 136         if (ttm->state != tt_unpopulated)
 137                 return 0;
 138
 139         return ttm_pool_populate(ttm);
 140 }
 141 EXPORT_SYMBOL(ttm_agp_tt_populate);
 142
 143 void ttm_agp_tt_unpopulate(struct ttm_tt *ttm)
 144 {
 145         ttm_pool_unpopulate(ttm);
 146 }
 147 EXPORT_SYMBOL(ttm_agp_tt_unpopulate);
 148
 149 #endif