drivers/gpu/drm/ttm/ttm_agp_backend.c

   1 /* SPDX-License-Identifier: GPL-2.0 OR MIT */
   2 /**************************************************************************
   3  *
   4  * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
   5  * All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the
   9  * "Software"), to deal in the Software without restriction, including
  10  * without limitation the rights to use, copy, modify, merge, publish,
  11  * distribute, sub license, and/or sell copies of the Software, and to
  12  * permit persons to whom the Software is furnished to do so, subject to
  13  * the following conditions:
  14  *
  15  * The above copyright notice and this permission notice (including the
  16  * next paragraph) shall be included in all copies or substantial portions
  17  * of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  20  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  22  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  23  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  24  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  25  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  26  *
  27  **************************************************************************/
  28 /*
  29  * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
  30  *          Keith Packard.
  31  */
  32
  33 #define pr_fmt(fmt) "[TTM] " fmt
  34
  35 #include <drm/ttm/ttm_device.h>
  36 #include <drm/ttm/ttm_tt.h>
  37 #include <drm/ttm/ttm_resource.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 int ttm_agp_bind(struct ttm_tt *ttm, struct ttm_resource *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_glob.dummy_read_page;
  54         struct agp_memory *mem;
  55         int ret, cached = ttm->caching == ttm_cached;
  56         unsigned i;
  57
  58         if (agp_be->mem)
  59                 return 0;
  60
  61         mem = agp_allocate_memory(agp_be->bridge, ttm->num_pages, AGP_USER_MEMORY);
  62         if (unlikely(mem == NULL))
  63                 return -ENOMEM;
  64
  65         mem->page_count = 0;
  66         for (i = 0; i < ttm->num_pages; i++) {
  67                 struct page *page = ttm->pages[i];
  68
  69                 if (!page)
  70                         page = dummy_read_page;
  71
  72                 mem->pages[mem->page_count++] = page;
  73         }
  74         agp_be->mem = mem;
  75
  76         mem->is_flushed = 1;
  77         mem->type = (cached) ? AGP_USER_CACHED_MEMORY : AGP_USER_MEMORY;
  78
  79         ret = agp_bind_memory(mem, bo_mem->start);
  80         if (ret)
  81                 pr_err("AGP Bind memory failed\n");
  82
  83         return ret;
  84 }
  85 EXPORT_SYMBOL(ttm_agp_bind);
  86
  87 void ttm_agp_unbind(struct ttm_tt *ttm)
  88 {
  89         struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
  90
  91         if (agp_be->mem) {
  92                 if (agp_be->mem->is_bound) {
  93                         agp_unbind_memory(agp_be->mem);
  94                         return;
  95                 }
  96                 agp_free_memory(agp_be->mem);
  97                 agp_be->mem = NULL;
  98         }
  99 }
 100 EXPORT_SYMBOL(ttm_agp_unbind);
 101
 102 bool ttm_agp_is_bound(struct ttm_tt *ttm)
 103 {
 104         struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
 105
 106         if (!ttm)
 107                 return false;
 108
 109         return (agp_be->mem != NULL);
 110 }
 111 EXPORT_SYMBOL(ttm_agp_is_bound);
 112
 113 void ttm_agp_destroy(struct ttm_tt *ttm)
 114 {
 115         struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
 116
 117         if (agp_be->mem)
 118                 ttm_agp_unbind(ttm);
 119         ttm_tt_fini(ttm);
 120         kfree(agp_be);
 121 }
 122 EXPORT_SYMBOL(ttm_agp_destroy);
 123
 124 struct ttm_tt *ttm_agp_tt_create(struct ttm_buffer_object *bo,
 125                                  struct agp_bridge_data *bridge,
 126                                  uint32_t page_flags)
 127 {
 128         struct ttm_agp_backend *agp_be;
 129
 130         agp_be = kmalloc(sizeof(*agp_be), GFP_KERNEL);
 131         if (!agp_be)
 132                 return NULL;
 133
 134         agp_be->mem = NULL;
 135         agp_be->bridge = bridge;
 136
 137         if (ttm_tt_init(&agp_be->ttm, bo, page_flags, ttm_write_combined)) {
 138                 kfree(agp_be);
 139                 return NULL;
 140         }
 141
 142         return &agp_be->ttm;
 143 }
 144 EXPORT_SYMBOL(ttm_agp_tt_create);