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,
  22  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  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/slab.h>
  39 #include <linux/io.h>
  40 #include <asm/agp.h>
  41
  42 struct ttm_agp_backend {
  43         struct ttm_backend backend;
  44         struct agp_memory *mem;
  45         struct agp_bridge_data *bridge;
  46 };
  47
  48 static int ttm_agp_populate(struct ttm_backend *backend,
  49                             unsigned long num_pages, struct page **pages,
  50                             struct page *dummy_read_page,
  51                             dma_addr_t *dma_addrs)
  52 {
  53         struct ttm_agp_backend *agp_be =
  54             container_of(backend, struct ttm_agp_backend, backend);
  55         struct page **cur_page, **last_page = pages + num_pages;
  56         struct agp_memory *mem;
  57
  58         mem = agp_allocate_memory(agp_be->bridge, num_pages, AGP_USER_MEMORY);
  59         if (unlikely(mem == NULL))
  60                 return -ENOMEM;
  61
  62         mem->page_count = 0;
  63         for (cur_page = pages; cur_page < last_page; ++cur_page) {
  64                 struct page *page = *cur_page;
  65                 if (!page)
  66                         page = dummy_read_page;
  67
  68                 mem->pages[mem->page_count++] = page;
  69         }
  70         agp_be->mem = mem;
  71         return 0;
  72 }
  73
  74 static int ttm_agp_bind(struct ttm_backend *backend, struct ttm_mem_reg *bo_mem)
  75 {
  76         struct ttm_agp_backend *agp_be =
  77             container_of(backend, struct ttm_agp_backend, backend);
  78         struct drm_mm_node *node = bo_mem->mm_node;
  79         struct agp_memory *mem = agp_be->mem;
  80         int cached = (bo_mem->placement & TTM_PL_FLAG_CACHED);
  81         int ret;
  82
  83         mem->is_flushed = 1;
  84         mem->type = (cached) ? AGP_USER_CACHED_MEMORY : AGP_USER_MEMORY;
  85
  86         ret = agp_bind_memory(mem, node->start);
  87         if (ret)
  88                 printk(KERN_ERR TTM_PFX "AGP Bind memory failed.\n");
  89
  90         return ret;
  91 }
  92
  93 static int ttm_agp_unbind(struct ttm_backend *backend)
  94 {
  95         struct ttm_agp_backend *agp_be =
  96             container_of(backend, struct ttm_agp_backend, backend);
  97
  98         if (agp_be->mem->is_bound)
  99                 return agp_unbind_memory(agp_be->mem);
 100         else
 101                 return 0;
 102 }
 103
 104 static void ttm_agp_clear(struct ttm_backend *backend)
 105 {
 106         struct ttm_agp_backend *agp_be =
 107             container_of(backend, struct ttm_agp_backend, backend);
 108         struct agp_memory *mem = agp_be->mem;
 109
 110         if (mem) {
 111                 ttm_agp_unbind(backend);
 112                 agp_free_memory(mem);
 113         }
 114         agp_be->mem = NULL;
 115 }
 116
 117 static void ttm_agp_destroy(struct ttm_backend *backend)
 118 {
 119         struct ttm_agp_backend *agp_be =
 120             container_of(backend, struct ttm_agp_backend, backend);
 121
 122         if (agp_be->mem)
 123                 ttm_agp_clear(backend);
 124         kfree(agp_be);
 125 }
 126
 127 static struct ttm_backend_func ttm_agp_func = {
 128         .populate = ttm_agp_populate,
 129         .clear = ttm_agp_clear,
 130         .bind = ttm_agp_bind,
 131         .unbind = ttm_agp_unbind,
 132         .destroy = ttm_agp_destroy,
 133 };
 134
 135 struct ttm_backend *ttm_agp_backend_init(struct ttm_bo_device *bdev,
 136                                          struct agp_bridge_data *bridge)
 137 {
 138         struct ttm_agp_backend *agp_be;
 139
 140         agp_be = kmalloc(sizeof(*agp_be), GFP_KERNEL);
 141         if (!agp_be)
 142                 return NULL;
 143
 144         agp_be->mem = NULL;
 145         agp_be->bridge = bridge;
 146         agp_be->backend.func = &ttm_agp_func;
 147         agp_be->backend.bdev = bdev;
 148         return &agp_be->backend;
 149 }
 150 EXPORT_SYMBOL(ttm_agp_backend_init);
 151
 152 #endif