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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  23  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  24  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  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 #ifdef TTM_HAS_AGP
  35 #include "ttm/ttm_placement.h"
  36 #include <linux/agp_backend.h>
  37 #include <linux/module.h>
  38 #include <linux/io.h>
  39 #include <asm/agp.h>
  40
  41 struct ttm_agp_backend {
  42         struct ttm_backend backend;
  43         struct agp_memory *mem;
  44         struct agp_bridge_data *bridge;
  45 };
  46
  47 static int ttm_agp_populate(struct ttm_backend *backend,
  48                             unsigned long num_pages, struct page **pages,
  49                             struct page *dummy_read_page)
  50 {
  51         struct ttm_agp_backend *agp_be =
  52             container_of(backend, struct ttm_agp_backend, backend);
  53         struct page **cur_page, **last_page = pages + num_pages;
  54         struct agp_memory *mem;
  55
  56         mem = agp_allocate_memory(agp_be->bridge, num_pages, AGP_USER_MEMORY);
  57         if (unlikely(mem == NULL))
  58                 return -ENOMEM;
  59
  60         mem->page_count = 0;
  61         for (cur_page = pages; cur_page < last_page; ++cur_page) {
  62                 struct page *page = *cur_page;
  63                 if (!page)
  64                         page = dummy_read_page;
  65
  66                 mem->pages[mem->page_count++] = page;
  67         }
  68         agp_be->mem = mem;
  69         return 0;
  70 }
  71
  72 static int ttm_agp_bind(struct ttm_backend *backend, struct ttm_mem_reg *bo_mem)
  73 {
  74         struct ttm_agp_backend *agp_be =
  75             container_of(backend, struct ttm_agp_backend, backend);
  76         struct agp_memory *mem = agp_be->mem;
  77         int cached = (bo_mem->placement & TTM_PL_FLAG_CACHED);
  78         int ret;
  79
  80         mem->is_flushed = 1;
  81         mem->type = (cached) ? AGP_USER_CACHED_MEMORY : AGP_USER_MEMORY;
  82
  83         ret = agp_bind_memory(mem, bo_mem->mm_node->start);
  84         if (ret)
  85                 printk(KERN_ERR TTM_PFX "AGP Bind memory failed.\n");
  86
  87         return ret;
  88 }
  89
  90 static int ttm_agp_unbind(struct ttm_backend *backend)
  91 {
  92         struct ttm_agp_backend *agp_be =
  93             container_of(backend, struct ttm_agp_backend, backend);
  94
  95         if (agp_be->mem->is_bound)
  96                 return agp_unbind_memory(agp_be->mem);
  97         else
  98                 return 0;
  99 }
 100
 101 static void ttm_agp_clear(struct ttm_backend *backend)
 102 {
 103         struct ttm_agp_backend *agp_be =
 104             container_of(backend, struct ttm_agp_backend, backend);
 105         struct agp_memory *mem = agp_be->mem;
 106
 107         if (mem) {
 108                 ttm_agp_unbind(backend);
 109                 agp_free_memory(mem);
 110         }
 111         agp_be->mem = NULL;
 112 }
 113
 114 static void ttm_agp_destroy(struct ttm_backend *backend)
 115 {
 116         struct ttm_agp_backend *agp_be =
 117             container_of(backend, struct ttm_agp_backend, backend);
 118
 119         if (agp_be->mem)
 120                 ttm_agp_clear(backend);
 121         kfree(agp_be);
 122 }
 123
 124 static struct ttm_backend_func ttm_agp_func = {
 125         .populate = ttm_agp_populate,
 126         .clear = ttm_agp_clear,
 127         .bind = ttm_agp_bind,
 128         .unbind = ttm_agp_unbind,
 129         .destroy = ttm_agp_destroy,
 130 };
 131
 132 struct ttm_backend *ttm_agp_backend_init(struct ttm_bo_device *bdev,
 133                                          struct agp_bridge_data *bridge)
 134 {
 135         struct ttm_agp_backend *agp_be;
 136
 137         agp_be = kmalloc(sizeof(*agp_be), GFP_KERNEL);
 138         if (!agp_be)
 139                 return NULL;
 140
 141         agp_be->mem = NULL;
 142         agp_be->bridge = bridge;
 143         agp_be->backend.func = &ttm_agp_func;
 144         agp_be->backend.bdev = bdev;
 145         return &agp_be->backend;
 146 }
 147 EXPORT_SYMBOL(ttm_agp_backend_init);
 148
 149 #endif