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_module.h>
  36 #include <drm/ttm/ttm_bo_driver.h>
  37 #include <drm/ttm/ttm_page_alloc.h>
  38 #include <drm/ttm/ttm_placement.h>
  39 #include <linux/agp_backend.h>
  40 #include <linux/module.h>
  41 #include <linux/slab.h>
  42 #include <linux/io.h>
  43 #include <asm/agp.h>
  44
  45 struct ttm_agp_backend {
  46         struct ttm_tt ttm;
  47         struct agp_memory *mem;
  48         struct agp_bridge_data *bridge;
  49 };
  50
  51 static int ttm_agp_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem)
  52 {
  53         struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
  54         struct page *dummy_read_page = ttm_bo_glob.dummy_read_page;
  55         struct drm_mm_node *node = bo_mem->mm_node;
  56         struct agp_memory *mem;
  57         int ret, cached = (bo_mem->placement & TTM_PL_FLAG_CACHED);
  58         unsigned i;
  59
  60         mem = agp_allocate_memory(agp_be->bridge, ttm->num_pages, AGP_USER_MEMORY);
  61         if (unlikely(mem == NULL))
  62                 return -ENOMEM;
  63
  64         mem->page_count = 0;
  65         for (i = 0; i < ttm->num_pages; i++) {
  66                 struct page *page = ttm->pages[i];
  67
  68                 if (!page)
  69                         page = dummy_read_page;
  70
  71                 mem->pages[mem->page_count++] = page;
  72         }
  73         agp_be->mem = mem;
  74
  75         mem->is_flushed = 1;
  76         mem->type = (cached) ? AGP_USER_CACHED_MEMORY : AGP_USER_MEMORY;
  77
  78         ret = agp_bind_memory(mem, node->start);
  79         if (ret)
  80                 pr_err("AGP Bind memory failed\n");
  81
  82         return ret;
  83 }
  84
  85 static void ttm_agp_unbind(struct ttm_tt *ttm)
  86 {
  87         struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
  88
  89         if (agp_be->mem) {
  90                 if (agp_be->mem->is_bound) {
  91                         agp_unbind_memory(agp_be->mem);
  92                         return;
  93                 }
  94                 agp_free_memory(agp_be->mem);
  95                 agp_be->mem = NULL;
  96         }
  97 }
  98
  99 static void ttm_agp_destroy(struct ttm_tt *ttm)
 100 {
 101         struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
 102
 103         if (agp_be->mem)
 104                 ttm_agp_unbind(ttm);
 105         ttm_tt_fini(ttm);
 106         kfree(agp_be);
 107 }
 108
 109 static struct ttm_backend_func ttm_agp_func = {
 110         .bind = ttm_agp_bind,
 111         .unbind = ttm_agp_unbind,
 112         .destroy = ttm_agp_destroy,
 113 };
 114
 115 struct ttm_tt *ttm_agp_tt_create(struct ttm_buffer_object *bo,
 116                                  struct agp_bridge_data *bridge,
 117                                  uint32_t page_flags)
 118 {
 119         struct ttm_agp_backend *agp_be;
 120
 121         agp_be = kmalloc(sizeof(*agp_be), GFP_KERNEL);
 122         if (!agp_be)
 123                 return NULL;
 124
 125         agp_be->mem = NULL;
 126         agp_be->bridge = bridge;
 127         agp_be->ttm.func = &ttm_agp_func;
 128
 129         if (ttm_tt_init(&agp_be->ttm, bo, page_flags)) {
 130                 kfree(agp_be);
 131                 return NULL;
 132         }
 133
 134         return &agp_be->ttm;
 135 }
 136 EXPORT_SYMBOL(ttm_agp_tt_create);
 137
 138 int ttm_agp_tt_populate(struct ttm_tt *ttm, struct ttm_operation_ctx *ctx)
 139 {
 140         if (ttm->state != tt_unpopulated)
 141                 return 0;
 142
 143         return ttm_pool_populate(ttm, ctx);
 144 }
 145 EXPORT_SYMBOL(ttm_agp_tt_populate);
 146
 147 void ttm_agp_tt_unpopulate(struct ttm_tt *ttm)
 148 {
 149         ttm_pool_unpopulate(ttm);
 150 }
 151 EXPORT_SYMBOL(ttm_agp_tt_unpopulate);