cmd: efidebug: add drivers command

"drivers" command prints all the uefi drivers on the system.

=> efi drivers
Driver           Name                 Image Path
================ ==================== ====================
000000007ef003d0 <NULL>               <built-in>

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 70f60a3..d39a836 100644 (file)
--- a/cmd/efidebug.c
+++ b/cmd/efidebug.c
@@ -91,6 +91,95 @@ static int do_efi_show_devices(cmd_tbl_t *cmdtp, int flag,
 }
 
 /**
+ * efi_get_driver_handle_info() - get information of UEFI driver
+ *
+ * @handle:            Handle of UEFI device
+ * @driver_name:       Driver name
+ * @image_path:                Pointer to text of device path
+ * Return:             0 on success, -1 on failure
+ *
+ * Currently return no useful information as all UEFI drivers are
+ * built-in..
+ */
+static int efi_get_driver_handle_info(efi_handle_t handle, u16 **driver_name,
+                                     u16 **image_path)
+{
+       struct efi_handler *handler;
+       struct efi_loaded_image *image;
+       efi_status_t ret;
+
+       /*
+        * driver name
+        * TODO: support EFI_COMPONENT_NAME2_PROTOCOL
+        */
+       *driver_name = NULL;
+
+       /* image name */
+       ret = efi_search_protocol(handle, &efi_guid_loaded_image, &handler);
+       if (ret != EFI_SUCCESS) {
+               *image_path = NULL;
+               return 0;
+       }
+
+       image = handler->protocol_interface;
+       *image_path = efi_dp_str(image->file_path);
+
+       return 0;
+}
+
+/**
+ * do_efi_show_drivers() - show UEFI drivers
+ *
+ * @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 "drivers" sub-command.
+ * Show all UEFI drivers and their information.
+ */
+static int do_efi_show_drivers(cmd_tbl_t *cmdtp, int flag,
+                              int argc, char * const argv[])
+{
+       efi_handle_t *handles;
+       efi_uintn_t num, i;
+       u16 *driver_name, *image_path_text;
+       efi_status_t ret;
+
+       ret = EFI_CALL(BS->locate_handle_buffer(
+                               BY_PROTOCOL, &efi_guid_driver_binding_protocol,
+                               NULL, &num, &handles));
+       if (ret != EFI_SUCCESS)
+               return CMD_RET_FAILURE;
+
+       if (!num)
+               return CMD_RET_SUCCESS;
+
+       printf("Driver%.*s Name                 Image Path\n",
+              EFI_HANDLE_WIDTH - 6, spc);
+       printf("%.*s ==================== ====================\n",
+              EFI_HANDLE_WIDTH, sep);
+       for (i = 0; i < num; i++) {
+               if (!efi_get_driver_handle_info(handles[i], &driver_name,
+                                               &image_path_text)) {
+                       if (image_path_text)
+                               printf("%p %-20ls %ls\n", handles[i],
+                                      driver_name, image_path_text);
+                       else
+                               printf("%p %-20ls <built-in>\n",
+                                      handles[i], driver_name);
+                       EFI_CALL(BS->free_pool(driver_name));
+                       EFI_CALL(BS->free_pool(image_path_text));
+               }
+       }
+
+       EFI_CALL(BS->free_pool(handles));
+
+       return CMD_RET_SUCCESS;
+}
+
+/**
  * do_efi_boot_add() - set UEFI load option
  *
  * @cmdtp:     Command table
@@ -594,6 +683,8 @@ 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,
                         "", ""),
+       U_BOOT_CMD_MKENT(drivers, CONFIG_SYS_MAXARGS, 1, do_efi_show_drivers,
+                        "", ""),
 };
 
 /**
@@ -654,7 +745,9 @@ static char efidebug_help_text[] =
        "  - set/show UEFI boot order\n"
        "\n"
        "efidebug devices\n"
-       "  - show uefi devices\n";
+       "  - show uefi devices\n"
+       "efidebug drivers\n"
+       "  - show uefi drivers\n";
 #endif
 
 U_BOOT_CMD(