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drm/nouveau/core/mm: fill in holes with "allocated" nodes
The allocation algorithm doesn't expect there to be holes in the mm, which causes its alignment/cutoff calculations to choke (and go negative) when encountering the last chunk of a block before a hole. The least expensive solution is to simply fill in any holes with nodes that are pre-marked as being allocated. Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
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@ -116,7 +116,7 @@ nouveau_mm_head(struct nouveau_mm *mm, u8 type, u32 size_max, u32 size_min,
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u32 splitoff;
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u32 s, e;
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BUG_ON(type == NVKM_MM_TYPE_NONE);
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BUG_ON(type == NVKM_MM_TYPE_NONE || type == NVKM_MM_TYPE_HOLE);
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list_for_each_entry(this, &mm->free, fl_entry) {
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e = this->offset + this->length;
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@ -182,7 +182,7 @@ nouveau_mm_tail(struct nouveau_mm *mm, u8 type, u32 size_max, u32 size_min,
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struct nouveau_mm_node *prev, *this, *next;
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u32 mask = align - 1;
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BUG_ON(type == NVKM_MM_TYPE_NONE);
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BUG_ON(type == NVKM_MM_TYPE_NONE || type == NVKM_MM_TYPE_HOLE);
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list_for_each_entry_reverse(this, &mm->free, fl_entry) {
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u32 e = this->offset + this->length;
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@ -227,9 +227,21 @@ nouveau_mm_tail(struct nouveau_mm *mm, u8 type, u32 size_max, u32 size_min,
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int
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nouveau_mm_init(struct nouveau_mm *mm, u32 offset, u32 length, u32 block)
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{
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struct nouveau_mm_node *node;
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struct nouveau_mm_node *node, *prev;
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u32 next;
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if (nouveau_mm_initialised(mm)) {
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prev = list_last_entry(&mm->nodes, typeof(*node), nl_entry);
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next = prev->offset + prev->length;
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if (next != offset) {
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BUG_ON(next > offset);
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if (!(node = kzalloc(sizeof(*node), GFP_KERNEL)))
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return -ENOMEM;
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node->type = NVKM_MM_TYPE_HOLE;
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node->offset = next;
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node->length = offset - next;
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list_add_tail(&node->nl_entry, &mm->nodes);
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}
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BUG_ON(block != mm->block_size);
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} else {
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INIT_LIST_HEAD(&mm->nodes);
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@ -264,9 +276,11 @@ nouveau_mm_fini(struct nouveau_mm *mm)
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return 0;
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list_for_each_entry(node, &mm->nodes, nl_entry) {
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if (++nodes > mm->heap_nodes) {
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nouveau_mm_dump(mm, "mm not clean!");
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return -EBUSY;
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if (node->type != NVKM_MM_TYPE_HOLE) {
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if (++nodes > mm->heap_nodes) {
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nouveau_mm_dump(mm, "mm not clean!");
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return -EBUSY;
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}
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}
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}
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@ -7,6 +7,7 @@ struct nouveau_mm_node {
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struct list_head rl_entry;
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#define NVKM_MM_TYPE_NONE 0x00
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#define NVKM_MM_TYPE_HOLE 0xff
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u8 type;
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u32 offset;
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u32 length;
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