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