sys/dev/drm/ttm/ttm_agp_backend.c

   1 /**************************************************************************
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   3  * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
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  12  * the following conditions:
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  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
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  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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  27 /*
  28  * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
  29  *          Keith Packard.
  30  *
  31  * $FreeBSD: head/sys/dev/drm2/ttm/ttm_agp_backend.c 247835 2013-03-05 09:49:34Z kib $
  32  */
  33
  34 #include <drm/drmP.h>
  35 #include <dev/drm/ttm/ttm_module.h>
  36 #include <dev/drm/ttm/ttm_bo_driver.h>
  37 #include <dev/drm/ttm/ttm_page_alloc.h>
  38 #ifdef TTM_HAS_AGP
  39 #include <dev/drm/ttm/ttm_placement.h>
  40
  41 struct ttm_agp_backend {
  42         struct ttm_tt ttm;
  43         struct agp_memory *mem;
  44         device_t bridge;
  45 };
  46
  47 MALLOC_DEFINE(M_TTM_AGP, "ttm_agp", "TTM AGP Backend");
  48
  49 static int ttm_agp_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem)
  50 {
  51         struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
  52         struct drm_mm_node *node = bo_mem->mm_node;
  53         struct agp_memory *mem;
  54         int ret, cached = (bo_mem->placement & TTM_PL_FLAG_CACHED);
  55         unsigned i;
  56
  57         mem = agp_alloc_memory(agp_be->bridge, AGP_USER_MEMORY, ttm->num_pages);
  58         if (unlikely(mem == NULL))
  59                 return -ENOMEM;
  60
  61         mem->page_count = 0;
  62         for (i = 0; i < ttm->num_pages; i++) {
  63                 vm_page_t page = ttm->pages[i];
  64
  65                 if (!page)
  66                         page = ttm->dummy_read_page;
  67
  68                 mem->pages[mem->page_count++] = page;
  69         }
  70         agp_be->mem = mem;
  71
  72         mem->is_flushed = 1;
  73         mem->type = (cached) ? AGP_USER_CACHED_MEMORY : AGP_USER_MEMORY;
  74
  75         ret = agp_bind_memory(mem, node->start);
  76         if (ret)
  77                 pr_err("AGP Bind memory failed\n");
  78
  79         return ret;
  80 }
  81
  82 static int ttm_agp_unbind(struct ttm_tt *ttm)
  83 {
  84         struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
  85
  86         if (agp_be->mem) {
  87                 if (agp_be->mem->is_bound)
  88                         return agp_unbind_memory(agp_be->mem);
  89                 agp_free_memory(agp_be->mem);
  90                 agp_be->mem = NULL;
  91         }
  92         return 0;
  93 }
  94
  95 static void ttm_agp_destroy(struct ttm_tt *ttm)
  96 {
  97         struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
  98
  99         if (agp_be->mem)
 100                 ttm_agp_unbind(ttm);
 101         ttm_tt_fini(ttm);
 102         drm_free(agp_be, M_TTM_AGP);
 103 }
 104
 105 static struct ttm_backend_func ttm_agp_func = {
 106         .bind = ttm_agp_bind,
 107         .unbind = ttm_agp_unbind,
 108         .destroy = ttm_agp_destroy,
 109 };
 110
 111 struct ttm_tt *ttm_agp_tt_create(struct ttm_bo_device *bdev,
 112                                  device_t bridge,
 113                                  unsigned long size, uint32_t page_flags,
 114                                  vm_page_t dummy_read_page)
 115 {
 116         struct ttm_agp_backend *agp_be;
 117
 118         agp_be = kmalloc(sizeof(*agp_be), M_TTM_AGP, M_WAITOK | M_ZERO);
 119
 120         agp_be->mem = NULL;
 121         agp_be->bridge = bridge;
 122         agp_be->ttm.func = &ttm_agp_func;
 123
 124         if (ttm_tt_init(&agp_be->ttm, bdev, size, page_flags, dummy_read_page)) {
 125                 return NULL;
 126         }
 127
 128         return &agp_be->ttm;
 129 }
 130
 131 int ttm_agp_tt_populate(struct ttm_tt *ttm)
 132 {
 133         if (ttm->state != tt_unpopulated)
 134                 return 0;
 135
 136         return ttm_pool_populate(ttm);
 137 }
 138
 139 void ttm_agp_tt_unpopulate(struct ttm_tt *ttm)
 140 {
 141         ttm_pool_unpopulate(ttm);
 142 }
 143
 144 #endif