[U-Boot] [PATCH v4 2/9] cmd: efitool: add devices command

[AKASHI Takahiro]

"devices" command prints all the uefi variables on the system.

=> efi devices
Scanning disk ahci_scsi.id0lun0...
Scanning disk ahci_scsi.id1lun0...
Found 4 disks
D
e
v                Device Path
================ ====================
        7ef3bfa0 /VenHw(e61d73b9-a384-4acc-aeab-82e828f3628b)
        7ef3cca0 /VenHw(e61d73b9-a384-4acc-aeab-82e828f3628b)/Scsi(0,0)
        7ef3d070 /VenHw(e61d73b9-a384-4acc-aeab-82e828f3628b)/Scsi(1,0)
        7ef3d1b0 /VenHw(e61d73b9-a384-4acc-aeab-82e828f3628b)/Scsi(1,0)/HD(1,MBR,0x086246ba,0x800,0x40000)
        7ef3d3e0 /VenHw(e61d73b9-a384-4acc-aeab-82e828f3628b)/Scsi(1,0)/HD(2,MBR,0x086246ba,0x40800,0x3f800)

Signed-off-by: AKASHI Takahiro <takahiro.akashi at linaro.org>
---
 cmd/efitool.c | 98 ++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 97 insertions(+), 1 deletion(-)

diff --git a/cmd/efitool.c b/cmd/efitool.c
index c7dc2c11f2e7..6b2df1beedb5 100644
--- a/cmd/efitool.c
+++ b/cmd/efitool.c
@@ -18,6 +18,8 @@
 #include <linux/ctype.h>
 #include <asm/global_data.h>
 
+#define BS systab.boottime
+
 static void dump_var_data(char *data, unsigned long len)
 {
 	char *start, *end, *p;
@@ -266,6 +268,96 @@ out:
 	return ret;
 }
 
+static int efi_get_handles_by_proto(efi_guid_t *guid, efi_handle_t **handlesp,
+				    int *num)
+{
+	efi_handle_t *handles = NULL;
+	efi_uintn_t size = 0;
+	efi_status_t ret;
+
+	if (guid) {
+		ret = BS->locate_handle(BY_PROTOCOL, guid, NULL, &size,
+					handles);
+		if (ret == EFI_BUFFER_TOO_SMALL) {
+			handles = calloc(1, size);
+			if (!handles)
+				return -1;
+
+			ret = BS->locate_handle(BY_PROTOCOL, guid, NULL, &size,
+						handles);
+		}
+		if (ret != EFI_SUCCESS) {
+			free(handles);
+			return -1;
+		}
+	} else {
+		ret = BS->locate_handle(ALL_HANDLES, NULL, NULL, &size, NULL);
+		if (ret == EFI_BUFFER_TOO_SMALL) {
+			handles = calloc(1, size);
+			if (!handles)
+				return -1;
+
+			ret = BS->locate_handle(ALL_HANDLES, NULL, NULL, &size,
+						handles);
+		}
+		if (ret != EFI_SUCCESS) {
+			free(handles);
+			return -1;
+		}
+	}
+
+	*handlesp = handles;
+	*num = size / sizeof(efi_handle_t);
+
+	return 0;
+}
+
+static int efi_get_device_handle_info(efi_handle_t handle, u16 **name)
+{
+	struct efi_device_path *dp;
+	efi_status_t ret;
+
+	ret = BS->open_protocol(handle, &efi_guid_device_path,
+				(void **)&dp, NULL /* FIXME */, NULL,
+				EFI_OPEN_PROTOCOL_GET_PROTOCOL);
+	if (ret == EFI_SUCCESS) {
+		*name = efi_dp_str(dp);
+		return 0;
+	} else {
+		return -1;
+	}
+}
+
+static int do_efi_show_devices(int argc, char * const argv[])
+{
+	efi_handle_t *handles;
+	u16 *devname;
+	int num, i;
+
+	handles = NULL;
+	num = 0;
+	if (efi_get_handles_by_proto(NULL, &handles, &num))
+		return CMD_RET_FAILURE;
+
+	if (!num)
+		return CMD_RET_SUCCESS;
+
+	printf("D\n");
+	printf("e\n");
+	printf("v                Device Path\n");
+	printf("================ ====================\n");
+	for (i = 0; i < num; i++) {
+		if (!efi_get_device_handle_info(handles[i], &devname)) {
+			printf("%16p %ls\n", handles[i], devname);
+			efi_free_pool(devname);
+		}
+	}
+
+	free(handles);
+
+	return CMD_RET_SUCCESS;
+}
+
 static int do_efi_boot_add(int argc, char * const argv[])
 {
 	int id;
@@ -673,6 +765,8 @@ static int do_efitool(cmd_tbl_t *cmdtp, int flag,
 		return do_efi_dump_var(argc, argv);
 	else if (!strcmp(command, "setvar"))
 		return do_efi_set_var(argc, argv);
+	else if (!strcmp(command, "devices"))
+		return do_efi_show_devices(argc, argv);
 	else
 		return CMD_RET_USAGE;
 }
@@ -697,7 +791,9 @@ static char efitool_help_text[] =
 	"  - show UEFI variable's value\n"
 	"efitool setvar <name> [<value>]\n"
 	"  - set/delete uefi variable's value\n"
-	"    <value> may be \"=\"...\"\", \"=0x...\", \"=H...\", (set) or \"=\" (delete)\n";
+	"    <value> may be \"=\"...\"\", \"=0x...\", \"=H...\", (set) or \"=\" (delete)\n"
+	"efitool devices\n"
+	"  - show uefi devices\n";
 #endif
 
 U_BOOT_CMD(
-- 
2.19.1