mirror of https://gitee.com/openkylin/qemu.git
115 lines
2.4 KiB
C
115 lines
2.4 KiB
C
/*
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* IOVA tree implementation based on GTree.
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*
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* Copyright 2018 Red Hat, Inc.
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*
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* Authors:
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* Peter Xu <peterx@redhat.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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*/
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#include "qemu/osdep.h"
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#include "qemu/iova-tree.h"
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struct IOVATree {
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GTree *tree;
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};
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static int iova_tree_compare(gconstpointer a, gconstpointer b, gpointer data)
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{
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const DMAMap *m1 = a, *m2 = b;
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if (m1->iova > m2->iova + m2->size) {
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return 1;
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}
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if (m1->iova + m1->size < m2->iova) {
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return -1;
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}
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/* Overlapped */
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return 0;
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}
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IOVATree *iova_tree_new(void)
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{
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IOVATree *iova_tree = g_new0(IOVATree, 1);
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/* We don't have values actually, no need to free */
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iova_tree->tree = g_tree_new_full(iova_tree_compare, NULL, g_free, NULL);
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return iova_tree;
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}
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const DMAMap *iova_tree_find(const IOVATree *tree, const DMAMap *map)
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{
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return g_tree_lookup(tree->tree, map);
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}
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const DMAMap *iova_tree_find_address(const IOVATree *tree, hwaddr iova)
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{
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const DMAMap map = { .iova = iova, .size = 0 };
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return iova_tree_find(tree, &map);
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}
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static inline void iova_tree_insert_internal(GTree *gtree, DMAMap *range)
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{
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/* Key and value are sharing the same range data */
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g_tree_insert(gtree, range, range);
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}
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int iova_tree_insert(IOVATree *tree, const DMAMap *map)
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{
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DMAMap *new;
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if (map->iova + map->size < map->iova || map->perm == IOMMU_NONE) {
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return IOVA_ERR_INVALID;
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}
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/* We don't allow to insert range that overlaps with existings */
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if (iova_tree_find(tree, map)) {
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return IOVA_ERR_OVERLAP;
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}
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new = g_new0(DMAMap, 1);
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memcpy(new, map, sizeof(*new));
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iova_tree_insert_internal(tree->tree, new);
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return IOVA_OK;
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}
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static gboolean iova_tree_traverse(gpointer key, gpointer value,
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gpointer data)
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{
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iova_tree_iterator iterator = data;
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DMAMap *map = key;
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g_assert(key == value);
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return iterator(map);
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}
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void iova_tree_foreach(IOVATree *tree, iova_tree_iterator iterator)
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{
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g_tree_foreach(tree->tree, iova_tree_traverse, iterator);
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}
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int iova_tree_remove(IOVATree *tree, const DMAMap *map)
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{
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const DMAMap *overlap;
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while ((overlap = iova_tree_find(tree, map))) {
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g_tree_remove(tree->tree, overlap);
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}
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return IOVA_OK;
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}
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void iova_tree_destroy(IOVATree *tree)
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{
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g_tree_destroy(tree->tree);
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g_free(tree);
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}
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