stats: Add a stats shell command

Adds the stats shell command to list all stats and enable the command in
the shell sample app.

Signed-off-by: Tom Burdick <thomas.burdick@intel.com>

samples/subsys/shell/shell_module/prj.conf

@@ -12,3 +12,5 @@ CONFIG_POSIX_CLOCK=y
 CONFIG_DATE_SHELL=y
 CONFIG_THREAD_RUNTIME_STATS=y
 CONFIG_THREAD_RUNTIME_STATS_USE_TIMING_FUNCTIONS=y
+CONFIG_STATS=y
+CONFIG_STATS_SHELL=y

subsys/stats/CMakeLists.txt

@@ -1,3 +1,4 @@
 # SPDX-License-Identifier: Apache-2.0
 
 zephyr_sources_ifdef(CONFIG_STATS stats.c)
+zephyr_sources_ifdef(CONFIG_STATS_SHELL stats_shell.c)

subsys/stats/Kconfig

@@ -17,3 +17,12 @@ config STATS_NAMES
 	  setting is disabled, statistics are assigned generic names of the
 	  form "s0", "s1", etc.  Enabling this setting simplifies debugging,
 	  but results in a larger code size.
+
+config STATS_SHELL
+	bool "Statistics Shell Command"
+	depends on STATS && SHELL
+	help
+	  Include a full name string for each statistic in the build.  If this
+	  setting is disabled, statistics are assigned generic names of the
+	  form "s0", "s1", etc.  Enabling this setting simplifies debugging,
+	  but results in a larger code size.

subsys/stats/stats_shell.c

@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 2021 Intel Corporation
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <shell/shell.h>
+#include <stats/stats.h>
+
+static int stats_cb(struct stats_hdr *hdr, void *arg, const char *name, uint16_t off)
+{
+	struct shell *sh = arg;
+	void *addr = (uint8_t *)hdr + off;
+	uint64_t val = 0;
+
+	switch (hdr->s_size) {
+	case sizeof(uint16_t):
+		val = *(uint16_t *)(addr);
+		break;
+
+	case sizeof(uint32_t):
+		val = *(uint32_t *)(addr);
+		break;
+	case sizeof(uint64_t):
+		val = *(uint64_t *)(addr);
+		break;
+	}
+	shell_print(sh, "\t%s (offset: %u, addr: %p): %llu", name, off, addr, val);
+	return 0;
+}
+
+static int stats_group_cb(struct stats_hdr *hdr, void *arg)
+{
+	struct shell *sh = arg;
+
+	shell_print(sh, "Stats Group %s (hdr addr: %x)", hdr->s_name, (void *)hdr);
+	return stats_walk(hdr, stats_cb, arg);
+}
+
+static int cmd_stats_list(const struct shell *sh, size_t argc,
+			  char **argv)
+{
+	return stats_group_walk(stats_group_cb, (struct shell *)sh);
+}
+
+SHELL_STATIC_SUBCMD_SET_CREATE(sub_stats,
+			       SHELL_CMD(list, NULL, "List stats", cmd_stats_list),
+			       SHELL_SUBCMD_SET_END /* Array terminated. */
+			       );
+
+SHELL_CMD_REGISTER(stats, &sub_stats, "Stats commands", NULL);