Initial commit

Signed-off-by: Robert Baldyga <robert.baldyga@intel.com>

modules/cas_cache/utils/utils_gc.c

@@ -0,0 +1,78 @@
+/*
+* Copyright(c) 2012-2019 Intel Corporation
+* SPDX-License-Identifier: BSD-3-Clause-Clear
+*/
+
+#include "utils_gc.h"
+#include <linux/vmalloc.h>
+
+#if defined (CAS_GARBAGE_COLLECTOR)
+struct cas_vfree_item {
+	struct llist_head list;
+	struct work_struct ws;
+};
+
+static DEFINE_PER_CPU(struct cas_vfree_item, cas_vfree_item);
+
+static atomic_t freed = ATOMIC_INIT(0);
+
+static void cas_garbage_collector(struct work_struct *w)
+{
+        struct cas_vfree_item *item = container_of(w, struct cas_vfree_item,
+			ws);
+	struct llist_node *llnode = llist_del_all(&item->list);
+
+	while (llnode) {
+		void *item = llnode;
+
+		llnode = llnode->next;
+		atomic_dec(&freed);
+		vfree(item);
+	}
+}
+
+void cas_vfree(const void *addr)
+{
+	struct cas_vfree_item *item = this_cpu_ptr(&cas_vfree_item);
+
+	atomic_inc(&freed);
+
+	if (llist_add((struct llist_node *)addr, &item->list))
+		schedule_work(&item->ws);
+}
+
+void cas_garbage_collector_init(void)
+{
+	int i;
+
+	for_each_possible_cpu(i) {
+		struct cas_vfree_item *item;
+
+		item = &per_cpu(cas_vfree_item, i);
+		init_llist_head(&item->list);
+		INIT_WORK(&item->ws, cas_garbage_collector);
+	}
+}
+
+void cas_garbage_collector_deinit(void)
+{
+	int i;
+
+	for_each_possible_cpu(i) {
+		struct cas_vfree_item *item;
+
+		item = &per_cpu(cas_vfree_item, i);
+		while (work_pending(&item->ws))
+			schedule();
+	}
+
+	WARN(atomic_read(&freed) != 0,
+			OCF_PREFIX_SHORT" Not all memory deallocated\n");
+}
+#else
+void cas_garbage_collector_init(void) {};
+
+void cas_garbage_collector_deinit(void) {};
+
+void cas_vfree(const void *addr) { vfree(addr); };
+#endif