sys/dev/drm/ttm/ttm_bo_manager.c

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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  *
  30  * $FreeBSD: head/sys/dev/drm2/ttm/ttm_bo_manager.c 247835 2013-03-05 09:49:34Z kib $
  31  */
  32
  33 #include <drm/drmP.h>
  34 #include <dev/drm/ttm/ttm_module.h>
  35 #include <dev/drm/ttm/ttm_bo_driver.h>
  36 #include <dev/drm/ttm/ttm_placement.h>
  37 #include <drm/drm_mm.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 MALLOC_DEFINE(M_TTM_RMAN, "ttm_rman", "TTM Range Manager");
  51
  52 static int ttm_bo_man_get_node(struct ttm_mem_type_manager *man,
  53                                struct ttm_buffer_object *bo,
  54                                struct ttm_placement *placement,
  55                                struct ttm_mem_reg *mem)
  56 {
  57         struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
  58         struct drm_mm *mm = &rman->mm;
  59         struct drm_mm_node *node = NULL;
  60         unsigned long lpfn;
  61         int ret;
  62
  63         lpfn = placement->lpfn;
  64         if (!lpfn)
  65                 lpfn = man->size;
  66         do {
  67                 ret = drm_mm_pre_get(mm);
  68                 if (unlikely(ret))
  69                         return ret;
  70
  71                 lockmgr(&rman->lock, LK_EXCLUSIVE);
  72                 node = drm_mm_search_free_in_range(mm,
  73                                         mem->num_pages, mem->page_alignment,
  74                                         placement->fpfn, lpfn, 1);
  75                 if (unlikely(node == NULL)) {
  76                         lockmgr(&rman->lock, LK_RELEASE);
  77                         return 0;
  78                 }
  79                 node = drm_mm_get_block_atomic_range(node, mem->num_pages,
  80                                                      mem->page_alignment,
  81                                                      placement->fpfn,
  82                                                      lpfn);
  83                 lockmgr(&rman->lock, LK_RELEASE);
  84         } while (node == NULL);
  85
  86         mem->mm_node = node;
  87         mem->start = node->start;
  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_put_block(mem->mm_node);
  99                 lockmgr(&rman->lock, LK_RELEASE);
 100                 mem->mm_node = NULL;
 101         }
 102 }
 103
 104 static int ttm_bo_man_init(struct ttm_mem_type_manager *man,
 105                            unsigned long p_size)
 106 {
 107         struct ttm_range_manager *rman;
 108         int ret;
 109
 110         rman = kmalloc(sizeof(*rman), M_TTM_RMAN, M_ZERO | M_WAITOK);
 111         ret = drm_mm_init(&rman->mm, 0, p_size);
 112         if (ret) {
 113                 drm_free(rman, M_TTM_RMAN);
 114                 return ret;
 115         }
 116
 117         lockinit(&rman->lock, "ttmrman", 0, LK_CANRECURSE);
 118         man->priv = rman;
 119         return 0;
 120 }
 121
 122 static int ttm_bo_man_takedown(struct ttm_mem_type_manager *man)
 123 {
 124         struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
 125         struct drm_mm *mm = &rman->mm;
 126
 127         lockmgr(&rman->lock, LK_EXCLUSIVE);
 128         if (drm_mm_clean(mm)) {
 129                 drm_mm_takedown(mm);
 130                 lockmgr(&rman->lock, LK_RELEASE);
 131                 lockuninit(&rman->lock);
 132                 drm_free(rman, M_TTM_RMAN);
 133                 man->priv = NULL;
 134                 return 0;
 135         }
 136         lockmgr(&rman->lock, LK_RELEASE);
 137         return -EBUSY;
 138 }
 139
 140 static void ttm_bo_man_debug(struct ttm_mem_type_manager *man,
 141                              const char *prefix)
 142 {
 143         struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
 144
 145         lockmgr(&rman->lock, LK_EXCLUSIVE);
 146         drm_mm_debug_table(&rman->mm, prefix);
 147         lockmgr(&rman->lock, LK_RELEASE);
 148 }
 149
 150 const struct ttm_mem_type_manager_func ttm_bo_manager_func = {
 151         ttm_bo_man_init,
 152         ttm_bo_man_takedown,
 153         ttm_bo_man_get_node,
 154         ttm_bo_man_put_node,
 155         ttm_bo_man_debug
 156 };