sys/dev/drm/ttm/ttm_agp_backend.c

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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 static int ttm_agp_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem)
  49 {
  50         struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
  51         struct drm_mm_node *node = bo_mem->mm_node;
  52         struct agp_memory *mem;
  53         int ret, cached = (bo_mem->placement & TTM_PL_FLAG_CACHED);
  54         unsigned i;
  55
  56         mem = agp_alloc_memory(agp_be->bridge, AGP_USER_MEMORY, ttm->num_pages);
  57         if (unlikely(mem == NULL))
  58                 return -ENOMEM;
  59
  60         mem->page_count = 0;
  61         for (i = 0; i < ttm->num_pages; i++) {
  62                 vm_page_t page = ttm->pages[i];
  63
  64                 if (!page)
  65                         page = ttm->dummy_read_page;
  66
  67                 mem->pages[mem->page_count++] = page;
  68         }
  69         agp_be->mem = mem;
  70
  71         mem->is_flushed = 1;
  72         mem->type = (cached) ? AGP_USER_CACHED_MEMORY : AGP_USER_MEMORY;
  73
  74         ret = agp_bind_memory(mem, node->start);
  75         if (ret)
  76                 pr_err("AGP Bind memory failed\n");
  77
  78         return ret;
  79 }
  80
  81 static int ttm_agp_unbind(struct ttm_tt *ttm)
  82 {
  83         struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
  84
  85         if (agp_be->mem) {
  86                 if (agp_be->mem->is_bound)
  87                         return agp_unbind_memory(agp_be->mem);
  88                 agp_free_memory(agp_be->mem);
  89                 agp_be->mem = NULL;
  90         }
  91         return 0;
  92 }
  93
  94 static void ttm_agp_destroy(struct ttm_tt *ttm)
  95 {
  96         struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
  97
  98         if (agp_be->mem)
  99                 ttm_agp_unbind(ttm);
 100         ttm_tt_fini(ttm);
 101         kfree(agp_be);
 102 }
 103
 104 static struct ttm_backend_func ttm_agp_func = {
 105         .bind = ttm_agp_bind,
 106         .unbind = ttm_agp_unbind,
 107         .destroy = ttm_agp_destroy,
 108 };
 109
 110 struct ttm_tt *ttm_agp_tt_create(struct ttm_bo_device *bdev,
 111                                  device_t bridge,
 112                                  unsigned long size, uint32_t page_flags,
 113                                  vm_page_t dummy_read_page)
 114 {
 115         struct ttm_agp_backend *agp_be;
 116
 117         agp_be = kmalloc(sizeof(*agp_be), M_DRM, M_WAITOK | M_ZERO);
 118         if (!agp_be)
 119                 return NULL;
 120
 121         agp_be->mem = NULL;
 122         agp_be->bridge = bridge;
 123         agp_be->ttm.func = &ttm_agp_func;
 124
 125         if (ttm_tt_init(&agp_be->ttm, bdev, size, page_flags, dummy_read_page)) {
 126                 kfree(agp_be);
 127                 return NULL;
 128         }
 129
 130         return &agp_be->ttm;
 131 }
 132 EXPORT_SYMBOL(ttm_agp_tt_create);
 133
 134 int ttm_agp_tt_populate(struct ttm_tt *ttm)
 135 {
 136         if (ttm->state != tt_unpopulated)
 137                 return 0;
 138
 139         return ttm_pool_populate(ttm);
 140 }
 141 EXPORT_SYMBOL(ttm_agp_tt_populate);
 142
 143 void ttm_agp_tt_unpopulate(struct ttm_tt *ttm)
 144 {
 145         ttm_pool_unpopulate(ttm);
 146 }
 147 EXPORT_SYMBOL(ttm_agp_tt_unpopulate);
 148
 149 #endif