cmd: efidebug: add devices command

"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
Device           Device Path
================ ====================
000000007ef07ea0 /VenHw(e61d73b9-a384-4acc-aeab-82e828f3628b)
000000007ef00c10 /VenHw(e61d73b9-a384-4acc-aeab-82e828f3628b)/Scsi(0,0)
000000007ef00dd0 /VenHw(e61d73b9-a384-4acc-aeab-82e828f3628b)/Scsi(1,0)
000000007ef07be0 /VenHw(e61d73b9-a384-4acc-aeab-82e828f3628b)/Scsi(1,0)/HD(1,MBR,0x086246ba,0x800,0x40000)
000000007ef07510 /VenHw(e61d73b9-a384-4acc-aeab-82e828f3628b)/Scsi(1,0)/HD(2,MBR,0x086246ba,0x40800,0x3f800)

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>

diff --git a/cmd/efidebug.c b/cmd/efidebug.c
index a1e0832..70f60a3 100644 (file)
--- a/cmd/efidebug.c
+++ b/cmd/efidebug.c
@@ -15,8 +15,81 @@
 #include <search.h>
 #include <linux/ctype.h>
 
+#define BS systab.boottime
 #define RT systab.runtime
 
+/**
+ * efi_get_device_handle_info() - get information of UEFI device
+ *
+ * @handle:            Handle of UEFI device
+ * @dev_path_text:     Pointer to text of device path
+ * Return:             0 on success, -1 on failure
+ *
+ * Currently return a formatted text of device path.
+ */
+static int efi_get_device_handle_info(efi_handle_t handle, u16 **dev_path_text)
+{
+       struct efi_device_path *dp;
+       efi_status_t ret;
+
+       ret = EFI_CALL(BS->open_protocol(handle, &efi_guid_device_path,
+                                        (void **)&dp, NULL /* FIXME */, NULL,
+                                        EFI_OPEN_PROTOCOL_GET_PROTOCOL));
+       if (ret == EFI_SUCCESS) {
+               *dev_path_text = efi_dp_str(dp);
+               return 0;
+       } else {
+               return -1;
+       }
+}
+
+#define EFI_HANDLE_WIDTH ((int)sizeof(efi_handle_t) * 2)
+
+static const char spc[] = "                ";
+static const char sep[] = "================";
+
+/**
+ * do_efi_show_devices() - show UEFI devices
+ *
+ * @cmdtp:     Command table
+ * @flag:      Command flag
+ * @argc:      Number of arguments
+ * @argv:      Argument array
+ * Return:     CMD_RET_SUCCESS on success, CMD_RET_RET_FAILURE on failure
+ *
+ * Implement efidebug "devices" sub-command.
+ * Show all UEFI devices and their information.
+ */
+static int do_efi_show_devices(cmd_tbl_t *cmdtp, int flag,
+                              int argc, char * const argv[])
+{
+       efi_handle_t *handles;
+       efi_uintn_t num, i;
+       u16 *dev_path_text;
+       efi_status_t ret;
+
+       ret = EFI_CALL(BS->locate_handle_buffer(ALL_HANDLES, NULL, NULL,
+                                               &num, &handles));
+       if (ret != EFI_SUCCESS)
+               return CMD_RET_FAILURE;
+
+       if (!num)
+               return CMD_RET_SUCCESS;
+
+       printf("Device%.*s Device Path\n", EFI_HANDLE_WIDTH - 6, spc);
+       printf("%.*s ====================\n", EFI_HANDLE_WIDTH, sep);
+       for (i = 0; i < num; i++) {
+               if (!efi_get_device_handle_info(handles[i], &dev_path_text)) {
+                       printf("%p %ls\n", handles[i], dev_path_text);
+                       efi_free_pool(dev_path_text);
+               }
+       }
+
+       EFI_CALL(BS->free_pool(handles));
+
+       return CMD_RET_SUCCESS;
+}
+
 /**
  * do_efi_boot_add() - set UEFI load option
  *
@@ -519,6 +592,8 @@ static int do_efi_boot_opt(cmd_tbl_t *cmdtp, int flag,
 
 static cmd_tbl_t cmd_efidebug_sub[] = {
        U_BOOT_CMD_MKENT(boot, CONFIG_SYS_MAXARGS, 1, do_efi_boot_opt, "", ""),
+       U_BOOT_CMD_MKENT(devices, CONFIG_SYS_MAXARGS, 1, do_efi_show_devices,
+                        "", ""),
 };
 
 /**
@@ -577,7 +652,9 @@ static char efidebug_help_text[] =
        "  - set UEFI BootNext variable\n"
        "efidebug boot order [<bootid#1> [<bootid#2> [<bootid#3> [...]]]]\n"
        "  - set/show UEFI boot order\n"
-       "\n";
+       "\n"
+       "efidebug devices\n"
+       "  - show uefi devices\n";
 #endif
 
 U_BOOT_CMD(