diff --git a/src/util/u_idalloc.c b/src/util/u_idalloc.c
index 9255faa8de2..23550f5ac0a 100644
--- a/src/util/u_idalloc.c
+++ b/src/util/u_idalloc.c
@@ -108,3 +108,70 @@ util_idalloc_reserve(struct util_idalloc *buf, unsigned id)
    assert((buf->data[id / 32] & (1u << (id % 32))) == 0);
    buf->data[id / 32] |= 1u << (id % 32);
 }
+
+void
+util_idalloc_mt_init(struct util_idalloc_mt *buf,
+                     unsigned initial_num_elements, bool skip_zero)
+{
+   simple_mtx_init(&buf->mutex, mtx_plain);
+   util_idalloc_init(&buf->buf);
+   buf->skip_zero = skip_zero;
+
+   if (initial_num_elements)
+      util_idalloc_resize(&buf->buf, initial_num_elements);
+
+   if (skip_zero) {
+      ASSERTED unsigned zero = util_idalloc_alloc(&buf->buf);
+      assert(zero == 0);
+   }
+}
+
+/* Callback for drivers using u_threaded_context (abbreviated as tc). */
+void
+util_idalloc_mt_init_tc(struct util_idalloc_mt *buf)
+{
+   util_idalloc_mt_init(buf, 1 << 16, true);
+}
+
+void
+util_idalloc_mt_fini(struct util_idalloc_mt *buf)
+{
+   util_idalloc_fini(&buf->buf);
+   simple_mtx_destroy(&buf->mutex);
+}
+
+void
+util_idalloc_mt_resize(struct util_idalloc_mt *buf, unsigned new_num_elements)
+{
+   simple_mtx_lock(&buf->mutex);
+   util_idalloc_resize(&buf->buf, new_num_elements);
+   simple_mtx_unlock(&buf->mutex);
+}
+
+unsigned
+util_idalloc_mt_alloc(struct util_idalloc_mt *buf)
+{
+   simple_mtx_lock(&buf->mutex);
+   unsigned id = util_idalloc_alloc(&buf->buf);
+   simple_mtx_unlock(&buf->mutex);
+   return id;
+}
+
+void
+util_idalloc_mt_free(struct util_idalloc_mt *buf, unsigned id)
+{
+   if (id == 0 && buf->skip_zero)
+      return;
+
+   simple_mtx_lock(&buf->mutex);
+   util_idalloc_free(&buf->buf, id);
+   simple_mtx_unlock(&buf->mutex);
+}
+
+void
+util_idalloc_mt_reserve(struct util_idalloc_mt *buf, unsigned id)
+{
+   simple_mtx_lock(&buf->mutex);
+   util_idalloc_reserve(&buf->buf, id);
+   simple_mtx_unlock(&buf->mutex);
+}
diff --git a/src/util/u_idalloc.h b/src/util/u_idalloc.h
index bd86e26195f..615a4071c62 100644
--- a/src/util/u_idalloc.h
+++ b/src/util/u_idalloc.h
@@ -29,6 +29,8 @@
 #define U_IDALLOC_H
 
 #include <inttypes.h>
+#include <stdbool.h>
+#include "simple_mtx.h"
 
 #ifdef __cplusplus
 extern "C" {
@@ -59,6 +61,37 @@ util_idalloc_free(struct util_idalloc *buf, unsigned id);
 void
 util_idalloc_reserve(struct util_idalloc *buf, unsigned id);
 
+
+/* Thread-safe variant. */
+struct util_idalloc_mt {
+   struct util_idalloc buf;
+   simple_mtx_t mutex;
+   bool skip_zero;
+};
+
+void
+util_idalloc_mt_init(struct util_idalloc_mt *buf,
+                     unsigned initial_num_elements, bool skip_zero);
+
+void
+util_idalloc_mt_init_tc(struct util_idalloc_mt *buf);
+
+void
+util_idalloc_mt_fini(struct util_idalloc_mt *buf);
+
+void
+util_idalloc_mt_resize(struct util_idalloc_mt *buf, unsigned new_num_elements);
+
+unsigned
+util_idalloc_mt_alloc(struct util_idalloc_mt *buf);
+
+void
+util_idalloc_mt_free(struct util_idalloc_mt *buf, unsigned id);
+
+void
+util_idalloc_mt_reserve(struct util_idalloc_mt *buf, unsigned id);
+
+
 #ifdef __cplusplus
 }
 #endif