sys/dev/drm/ttm/ttm_agp_backend.c

   1 /**************************************************************************
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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 #define pr_fmt(fmt) "[TTM] " fmt
  35
  36 #include <drm/ttm/ttm_module.h>
  37 #include <drm/ttm/ttm_bo_driver.h>
  38 #include <drm/ttm/ttm_page_alloc.h>
  39 #ifdef TTM_HAS_AGP
  40 #include <drm/ttm/ttm_placement.h>
  41
  42 struct ttm_agp_backend {
  43         struct ttm_tt ttm;
  44         struct agp_memory *mem;
  45         device_t bridge;
  46 };
  47
  48 MALLOC_DEFINE(M_TTM_AGP, "ttm_agp", "TTM AGP Backend");
  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_alloc_memory(agp_be->bridge, AGP_USER_MEMORY, ttm->num_pages);
  59         if (unlikely(mem == NULL))
  60                 return -ENOMEM;
  61
  62         mem->page_count = 0;
  63         for (i = 0; i < ttm->num_pages; i++) {
  64                 vm_page_t 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         drm_free(agp_be, M_TTM_AGP);
 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                                  device_t bridge,
 114                                  unsigned long size, uint32_t page_flags,
 115                                  vm_page_t dummy_read_page)
 116 {
 117         struct ttm_agp_backend *agp_be;
 118
 119         agp_be = kmalloc(sizeof(*agp_be), M_TTM_AGP, M_WAITOK | M_ZERO);
 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                 return NULL;
 129         }
 130
 131         return &agp_be->ttm;
 132 }
 133 EXPORT_SYMBOL(ttm_agp_tt_create);
 134
 135 int ttm_agp_tt_populate(struct ttm_tt *ttm)
 136 {
 137         if (ttm->state != tt_unpopulated)
 138                 return 0;
 139
 140         return ttm_pool_populate(ttm);
 141 }
 142 EXPORT_SYMBOL(ttm_agp_tt_populate);
 143
 144 void ttm_agp_tt_unpopulate(struct ttm_tt *ttm)
 145 {
 146         ttm_pool_unpopulate(ttm);
 147 }
 148 EXPORT_SYMBOL(ttm_agp_tt_unpopulate);
 149
 150 #endif