[PATCH v9 5/7] memarea: support dump API

[Chengwen Feng <fengchengwen@huawei.com>]

This patch supports rte_memarea_dump() API which could be used for
debug.

Signed-off-by: Chengwen Feng <fengchengwen@huawei.com>
---
 doc/guides/prog_guide/memarea_lib.rst |  3 +
 lib/memarea/rte_memarea.c             | 98 +++++++++++++++++++++++++++
 lib/memarea/rte_memarea.h             | 21 ++++++
 lib/memarea/version.map               |  1 +
 4 files changed, 123 insertions(+)

diff --git a/doc/guides/prog_guide/memarea_lib.rst b/doc/guides/prog_guide/memarea_lib.rst
index 8fbfd06a5d..c33a548417 100644
--- a/doc/guides/prog_guide/memarea_lib.rst
+++ b/doc/guides/prog_guide/memarea_lib.rst
@@ -43,6 +43,9 @@ The ``rte_memarea_refcnt_update()`` function is used to update the memory
 object's reference count, if the count reaches zero, the memory object will
 be freed to memarea.
 
++The ``rte_memarea_dump()`` function is used to dump the internal information
++of a memarea.
+
 Reference
 ---------
 
diff --git a/lib/memarea/rte_memarea.c b/lib/memarea/rte_memarea.c
index 178430900e..629e7a5ffc 100644
--- a/lib/memarea/rte_memarea.c
+++ b/lib/memarea/rte_memarea.c
@@ -2,6 +2,7 @@
  * Copyright(c) 2022 HiSilicon Limited
  */
 
+#include <inttypes.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <sys/queue.h>
@@ -298,3 +299,100 @@ rte_memarea_refcnt_update(struct rte_memarea *ma, void *ptr, int32_t value)
 		memarea_free_elem(ma, elem);
 	memarea_unlock(ma);
 }
+
+static const char *
+memarea_source_name(enum rte_memarea_source source)
+{
+	if (source == RTE_MEMAREA_SOURCE_HEAP)
+		return "heap";
+	else if (source == RTE_MEMAREA_SOURCE_LIBC)
+		return "libc";
+	else if (source == RTE_MEMAREA_SOURCE_MEMAREA)
+		return "memarea";
+	else
+		return "unknown";
+}
+
+static const char *
+memarea_alg_name(enum rte_memarea_alg alg)
+{
+	if (alg == RTE_MEMAREA_ALG_NEXTFIT)
+		return "nextfit";
+	else
+		return "unknown";
+}
+
+static uint32_t
+memarea_elem_list_num(struct rte_memarea *ma)
+{
+	struct memarea_elem *elem;
+	uint32_t num = 0;
+
+	TAILQ_FOREACH(elem, &ma->elem_list, elem_node) {
+		if (elem->magic != MEMAREA_AVAILABLE_ELEM_MAGIC &&
+		    elem->magic != MEMAREA_ALLOCATED_ELEM_MAGIC)
+			break;
+		num++;
+	}
+
+	return num;
+}
+
+static uint32_t
+memarea_free_list_num(struct rte_memarea *ma)
+{
+	struct memarea_elem *elem;
+	uint32_t num = 0;
+
+	TAILQ_FOREACH(elem, &ma->free_list, free_node) {
+		if (elem->magic != MEMAREA_AVAILABLE_ELEM_MAGIC)
+			break;
+		num++;
+	}
+
+	return num;
+}
+
+static void
+memarea_dump_all(struct rte_memarea *ma, FILE *f)
+{
+	struct memarea_elem *elem;
+
+	fprintf(f, "  regions:\n");
+	TAILQ_FOREACH(elem, &ma->elem_list, elem_node) {
+		if (elem->magic != MEMAREA_AVAILABLE_ELEM_MAGIC &&
+		    elem->magic != MEMAREA_ALLOCATED_ELEM_MAGIC) {
+			fprintf(f, "    magic: 0x%x check fail!\n", elem->magic);
+			break;
+		}
+		fprintf(f, "    size: 0x%zx cookie: 0x%x refcnt: %d\n",
+			elem->size, elem->cookie, elem->refcnt);
+	}
+}
+
+int
+rte_memarea_dump(struct rte_memarea *ma, FILE *f, bool dump_all)
+{
+	if (ma == NULL || f == NULL)
+		return -EINVAL;
+
+	memarea_lock(ma);
+	fprintf(f, "memarea name: %s\n", ma->init.name);
+	fprintf(f, "  source: %s\n", memarea_source_name(ma->init.source));
+	if (ma->init.source == RTE_MEMAREA_SOURCE_HEAP)
+		fprintf(f, "  heap-numa-socket: %d\n", ma->init.numa_socket);
+	else if (ma->init.source == RTE_MEMAREA_SOURCE_MEMAREA)
+		fprintf(f, "  source-memarea: %s\n", ma->init.src_memarea->init.name);
+	fprintf(f, "  algorithm: %s\n", memarea_alg_name(ma->init.alg));
+	fprintf(f, "  total-size: 0x%zx\n", ma->init.total_sz);
+	fprintf(f, "  mt-safe: %s\n", ma->init.mt_safe ? "yes" : "no");
+	fprintf(f, "  total-regions: %u\n", memarea_elem_list_num(ma));
+	fprintf(f, "  total-free-regions: %u\n", memarea_free_list_num(ma));
+	fprintf(f, "  alloc_fails: %" PRIu64 "\n", ma->alloc_fails);
+	fprintf(f, "  refcnt_check_fails: %" PRIu64 "\n", ma->refcnt_check_fails);
+	if (dump_all)
+		memarea_dump_all(ma, f);
+	memarea_unlock(ma);
+
+	return 0;
+}
diff --git a/lib/memarea/rte_memarea.h b/lib/memarea/rte_memarea.h
index 31c499ec07..61042a8d0d 100644
--- a/lib/memarea/rte_memarea.h
+++ b/lib/memarea/rte_memarea.h
@@ -191,6 +191,27 @@ void rte_memarea_free(struct rte_memarea *ma, void *ptr);
 __rte_experimental
 void rte_memarea_refcnt_update(struct rte_memarea *ma, void *ptr, int32_t value);
 
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice.
+ *
+ * Dump memarea.
+ *
+ * Dump one memarea.
+ *
+ * @param ma
+ *   The pointer of memarea.
+ * @param f
+ *   The file to write the output to.
+ * @param dump_all
+ *   Indicate whether to dump the allocated and free memory objects information.
+ *
+ * @return
+ *   0 on success. Otherwise negative value is returned.
+ */
+__rte_experimental
+int rte_memarea_dump(struct rte_memarea *ma, FILE *f, bool dump_all);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/lib/memarea/version.map b/lib/memarea/version.map
index a087d40d5f..6d75f9f7c4 100644
--- a/lib/memarea/version.map
+++ b/lib/memarea/version.map
@@ -4,6 +4,7 @@ EXPERIMENTAL {
 	rte_memarea_alloc;
 	rte_memarea_create;
 	rte_memarea_destroy;
+	rte_memarea_dump;
 	rte_memarea_free;
 	rte_memarea_refcnt_update;
 
-- 
2.17.1