sys/dev/drm/ttm/ttm_bo_manager.c

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  27 /*
  28  * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
  29  *
  30  * $FreeBSD: head/sys/dev/drm2/ttm/ttm_bo_manager.c 247835 2013-03-05 09:49:34Z kib $
  31  */
  32
  33 #include <drm/ttm/ttm_module.h>
  34 #include <drm/ttm/ttm_bo_driver.h>
  35 #include <drm/ttm/ttm_placement.h>
  36 #include <drm/drm_mm.h>
  37 #include <linux/export.h>
  38
  39 /**
  40  * Currently we use a spinlock for the lock, but a mutex *may* be
  41  * more appropriate to reduce scheduling latency if the range manager
  42  * ends up with very fragmented allocation patterns.
  43  */
  44
  45 struct ttm_range_manager {
  46         struct drm_mm mm;
  47         struct lock lock;
  48 };
  49
  50 static int ttm_bo_man_get_node(struct ttm_mem_type_manager *man,
  51                                struct ttm_buffer_object *bo,
  52                                const struct ttm_place *place,
  53                                struct ttm_mem_reg *mem)
  54 {
  55         struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
  56         struct drm_mm *mm = &rman->mm;
  57         struct drm_mm_node *node = NULL;
  58         enum drm_mm_allocator_flags aflags = DRM_MM_CREATE_DEFAULT;
  59         unsigned long lpfn;
  60         int ret;
  61
  62         lpfn = place->lpfn;
  63         if (!lpfn)
  64                 lpfn = man->size;
  65
  66         node = kzalloc(sizeof(*node), GFP_KERNEL);
  67         if (!node)
  68                 return -ENOMEM;
  69
  70         if (place->flags & TTM_PL_FLAG_TOPDOWN)
  71                 aflags = DRM_MM_CREATE_TOP;
  72
  73         lockmgr(&rman->lock, LK_EXCLUSIVE);
  74         ret = drm_mm_insert_node_in_range_generic(mm, node, mem->num_pages,
  75                                           mem->page_alignment, 0,
  76                                           place->fpfn, lpfn,
  77                                           DRM_MM_SEARCH_BEST,
  78                                           aflags);
  79         lockmgr(&rman->lock, LK_RELEASE);
  80
  81         if (unlikely(ret)) {
  82                 kfree(node);
  83         } else {
  84                 mem->mm_node = node;
  85                 mem->start = node->start;
  86         }
  87
  88         return 0;
  89 }
  90
  91 static void ttm_bo_man_put_node(struct ttm_mem_type_manager *man,
  92                                 struct ttm_mem_reg *mem)
  93 {
  94         struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
  95
  96         if (mem->mm_node) {
  97                 lockmgr(&rman->lock, LK_EXCLUSIVE);
  98                 drm_mm_remove_node(mem->mm_node);
  99                 lockmgr(&rman->lock, LK_RELEASE);
 100
 101                 kfree(mem->mm_node);
 102                 mem->mm_node = NULL;
 103         }
 104 }
 105
 106 static int ttm_bo_man_init(struct ttm_mem_type_manager *man,
 107                            unsigned long p_size)
 108 {
 109         struct ttm_range_manager *rman;
 110
 111         rman = kzalloc(sizeof(*rman), GFP_KERNEL);
 112         if (!rman)
 113                 return -ENOMEM;
 114
 115         drm_mm_init(&rman->mm, 0, p_size);
 116         lockinit(&rman->lock, "ttmrman", 0, LK_CANRECURSE);
 117         man->priv = rman;
 118         return 0;
 119 }
 120
 121 static int ttm_bo_man_takedown(struct ttm_mem_type_manager *man)
 122 {
 123         struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
 124         struct drm_mm *mm = &rman->mm;
 125
 126         lockmgr(&rman->lock, LK_EXCLUSIVE);
 127         if (drm_mm_clean(mm)) {
 128                 drm_mm_takedown(mm);
 129                 lockmgr(&rman->lock, LK_RELEASE);
 130                 kfree(rman);
 131                 man->priv = NULL;
 132                 return 0;
 133         }
 134         lockmgr(&rman->lock, LK_RELEASE);
 135         return -EBUSY;
 136 }
 137
 138 static void ttm_bo_man_debug(struct ttm_mem_type_manager *man,
 139                              const char *prefix)
 140 {
 141         struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
 142
 143         lockmgr(&rman->lock, LK_EXCLUSIVE);
 144         drm_mm_debug_table(&rman->mm, prefix);
 145         lockmgr(&rman->lock, LK_RELEASE);
 146 }
 147
 148 const struct ttm_mem_type_manager_func ttm_bo_manager_func = {
 149         ttm_bo_man_init,
 150         ttm_bo_man_takedown,
 151         ttm_bo_man_get_node,
 152         ttm_bo_man_put_node,
 153         ttm_bo_man_debug
 154 };
 155 EXPORT_SYMBOL(ttm_bo_manager_func);