dm: core: Add a command to show driver model statistics

This command shows the memory used by driver model along with various
hints as to what it might be if some 'core' tags were moved to use the
tag list instead of a core (i.e. always-there) pointer.

This may help with future work to reduce memory usage.

Signed-off-by: Simon Glass <sjg@chromium.org>

1 files changed, 24 insertions, 0 deletions

diff --git a/cmd/dm.c b/cmd/dm.c
index 0c7554a..eb40f08 100644
--- a/cmd/dm.c
+++ b/cmd/dm.c
@@ -8,6 +8,7 @@
 
 #include <common.h>
 #include <command.h>
+#include <dm/root.h>
 #include <dm/util.h>
 
 static int do_dm_dump_driver_compat(struct cmd_tbl *cmdtp, int flag, int argc,
@@ -34,6 +35,19 @@ static int do_dm_dump_drivers(struct cmd_tbl *cmdtp, int flag, int argc,
 	return 0;
 }
 
+#if CONFIG_IS_ENABLED(DM_STATS)
+static int do_dm_dump_mem(struct cmd_tbl *cmdtp, int flag, int argc,
+			  char *const argv[])
+{
+	struct dm_stats mem;
+
+	dm_get_mem(&mem);
+	dm_dump_mem(&mem);
+
+	return 0;
+}
+#endif /* DM_STATS */
+
 static int do_dm_dump_static_driver_info(struct cmd_tbl *cmdtp, int flag,
 					 int argc, char * const argv[])
 {
@@ -58,11 +72,20 @@ static int do_dm_dump_uclass(struct cmd_tbl *cmdtp, int flag, int argc,
 	return 0;
 }
 
+#if CONFIG_IS_ENABLED(DM_STATS)
+#define DM_MEM_HELP	"dm mem           Provide a summary of memory usage\n"
+#define DM_MEM		U_BOOT_SUBCMD_MKENT(mem, 1, 1, do_dm_dump_mem),
+#else
+#define DM_MEM_HELP
+#define DM_MEM
+#endif
+
 #if CONFIG_IS_ENABLED(SYS_LONGHELP)
 static char dm_help_text[] =
 	"compat        Dump list of drivers with compatibility strings\n"
 	"dm devres        Dump list of device resources for each device\n"
 	"dm drivers       Dump list of drivers with uclass and instances\n"
+	DM_MEM_HELP
 	"dm static        Dump list of drivers with static platform data\n"
 	"dn tree          Dump tree of driver model devices ('*' = activated)\n"
 	"dm uclass        Dump list of instances for each uclass"
@@ -73,6 +96,7 @@ U_BOOT_CMD_WITH_SUBCMDS(dm, "Driver model low level access", dm_help_text,
 	U_BOOT_SUBCMD_MKENT(compat, 1, 1, do_dm_dump_driver_compat),
 	U_BOOT_SUBCMD_MKENT(devres, 1, 1, do_dm_dump_devres),
 	U_BOOT_SUBCMD_MKENT(drivers, 1, 1, do_dm_dump_drivers),
+	DM_MEM
 	U_BOOT_SUBCMD_MKENT(static, 1, 1, do_dm_dump_static_driver_info),
 	U_BOOT_SUBCMD_MKENT(tree, 1, 1, do_dm_dump_tree),
 	U_BOOT_SUBCMD_MKENT(uclass, 1, 1, do_dm_dump_uclass));