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-rw-r--r--block.c148
1 files changed, 148 insertions, 0 deletions
diff --git a/block.c b/block.c
index 4f5ff2cc12..e795a7c5de 100644
--- a/block.c
+++ b/block.c
@@ -4119,6 +4119,154 @@ BlockDeviceInfoList *bdrv_named_nodes_list(Error **errp)
return list;
}
+#define QAPI_LIST_ADD(list, element) do { \
+ typeof(list) _tmp = g_new(typeof(*(list)), 1); \
+ _tmp->value = (element); \
+ _tmp->next = (list); \
+ (list) = _tmp; \
+} while (0)
+
+typedef struct XDbgBlockGraphConstructor {
+ XDbgBlockGraph *graph;
+ GHashTable *graph_nodes;
+} XDbgBlockGraphConstructor;
+
+static XDbgBlockGraphConstructor *xdbg_graph_new(void)
+{
+ XDbgBlockGraphConstructor *gr = g_new(XDbgBlockGraphConstructor, 1);
+
+ gr->graph = g_new0(XDbgBlockGraph, 1);
+ gr->graph_nodes = g_hash_table_new(NULL, NULL);
+
+ return gr;
+}
+
+static XDbgBlockGraph *xdbg_graph_finalize(XDbgBlockGraphConstructor *gr)
+{
+ XDbgBlockGraph *graph = gr->graph;
+
+ g_hash_table_destroy(gr->graph_nodes);
+ g_free(gr);
+
+ return graph;
+}
+
+static uintptr_t xdbg_graph_node_num(XDbgBlockGraphConstructor *gr, void *node)
+{
+ uintptr_t ret = (uintptr_t)g_hash_table_lookup(gr->graph_nodes, node);
+
+ if (ret != 0) {
+ return ret;
+ }
+
+ /*
+ * Start counting from 1, not 0, because 0 interferes with not-found (NULL)
+ * answer of g_hash_table_lookup.
+ */
+ ret = g_hash_table_size(gr->graph_nodes) + 1;
+ g_hash_table_insert(gr->graph_nodes, node, (void *)ret);
+
+ return ret;
+}
+
+static void xdbg_graph_add_node(XDbgBlockGraphConstructor *gr, void *node,
+ XDbgBlockGraphNodeType type, const char *name)
+{
+ XDbgBlockGraphNode *n;
+
+ n = g_new0(XDbgBlockGraphNode, 1);
+
+ n->id = xdbg_graph_node_num(gr, node);
+ n->type = type;
+ n->name = g_strdup(name);
+
+ QAPI_LIST_ADD(gr->graph->nodes, n);
+}
+
+static void xdbg_graph_add_edge(XDbgBlockGraphConstructor *gr, void *parent,
+ const BdrvChild *child)
+{
+ typedef struct {
+ unsigned int flag;
+ BlockPermission num;
+ } PermissionMap;
+
+ static const PermissionMap permissions[] = {
+ { BLK_PERM_CONSISTENT_READ, BLOCK_PERMISSION_CONSISTENT_READ },
+ { BLK_PERM_WRITE, BLOCK_PERMISSION_WRITE },
+ { BLK_PERM_WRITE_UNCHANGED, BLOCK_PERMISSION_WRITE_UNCHANGED },
+ { BLK_PERM_RESIZE, BLOCK_PERMISSION_RESIZE },
+ { BLK_PERM_GRAPH_MOD, BLOCK_PERMISSION_GRAPH_MOD },
+ { 0, 0 }
+ };
+ const PermissionMap *p;
+ XDbgBlockGraphEdge *edge;
+
+ QEMU_BUILD_BUG_ON(1UL << (ARRAY_SIZE(permissions) - 1) != BLK_PERM_ALL + 1);
+
+ edge = g_new0(XDbgBlockGraphEdge, 1);
+
+ edge->parent = xdbg_graph_node_num(gr, parent);
+ edge->child = xdbg_graph_node_num(gr, child->bs);
+ edge->name = g_strdup(child->name);
+
+ for (p = permissions; p->flag; p++) {
+ if (p->flag & child->perm) {
+ QAPI_LIST_ADD(edge->perm, p->num);
+ }
+ if (p->flag & child->shared_perm) {
+ QAPI_LIST_ADD(edge->shared_perm, p->num);
+ }
+ }
+
+ QAPI_LIST_ADD(gr->graph->edges, edge);
+}
+
+
+XDbgBlockGraph *bdrv_get_xdbg_block_graph(Error **errp)
+{
+ BlockBackend *blk;
+ BlockJob *job;
+ BlockDriverState *bs;
+ BdrvChild *child;
+ XDbgBlockGraphConstructor *gr = xdbg_graph_new();
+
+ for (blk = blk_all_next(NULL); blk; blk = blk_all_next(blk)) {
+ char *allocated_name = NULL;
+ const char *name = blk_name(blk);
+
+ if (!*name) {
+ name = allocated_name = blk_get_attached_dev_id(blk);
+ }
+ xdbg_graph_add_node(gr, blk, X_DBG_BLOCK_GRAPH_NODE_TYPE_BLOCK_BACKEND,
+ name);
+ g_free(allocated_name);
+ if (blk_root(blk)) {
+ xdbg_graph_add_edge(gr, blk, blk_root(blk));
+ }
+ }
+
+ for (job = block_job_next(NULL); job; job = block_job_next(job)) {
+ GSList *el;
+
+ xdbg_graph_add_node(gr, job, X_DBG_BLOCK_GRAPH_NODE_TYPE_BLOCK_JOB,
+ job->job.id);
+ for (el = job->nodes; el; el = el->next) {
+ xdbg_graph_add_edge(gr, job, (BdrvChild *)el->data);
+ }
+ }
+
+ QTAILQ_FOREACH(bs, &graph_bdrv_states, node_list) {
+ xdbg_graph_add_node(gr, bs, X_DBG_BLOCK_GRAPH_NODE_TYPE_BLOCK_DRIVER,
+ bs->node_name);
+ QLIST_FOREACH(child, &bs->children, next) {
+ xdbg_graph_add_edge(gr, bs, child);
+ }
+ }
+
+ return xdbg_graph_finalize(gr);
+}
+
BlockDriverState *bdrv_lookup_bs(const char *device,
const char *node_name,
Error **errp)