[PATCH v2 2/2] efi_loader: Reset system after CapsuleUpdate on disk

[Masami Hiramatsu]

Add a config option to reset system soon after processing capsule update
on disk. This is required in UEFI specification 2.9 Section 8.5.5
 "Delivery of Capsules via file on Mass Storage device" as;

    In all cases that a capsule is identified for processing the system is
    restarted after capsule processing is completed.

This also reports the result of each capsule update so that the user can
notice that the capsule update has been succeeded or not from console log.

Signed-off-by: Masami Hiramatsu <masami.hiramatsu at linaro.org>
---
 Changes in v3:
  - Log succeeded capsule update in info level.
  - Use sysreset if possible.
  - Use do_reset() and hang() instead of panic().
 Changes in v2:
  - Remove kconfig option to disable this feature.
  - Use panic() instead of do_reset() so that if the reset fails,
    the machine halt.
  - Log the result of each capsule update always.
---
 lib/efi_loader/efi_capsule.c |   22 ++++++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

diff --git a/lib/efi_loader/efi_capsule.c b/lib/efi_loader/efi_capsule.c
index 1ec7ea29ff..ade9155042 100644
--- a/lib/efi_loader/efi_capsule.c
+++ b/lib/efi_loader/efi_capsule.c
@@ -14,9 +14,11 @@
 #include <env.h>
 #include <fdtdec.h>
 #include <fs.h>
+#include <hang.h>
 #include <malloc.h>
 #include <mapmem.h>
 #include <sort.h>
+#include <sysreset.h>
 #include <asm/global_data.h>
 
 #include <crypto/pkcs7.h>
@@ -1120,8 +1122,11 @@ efi_status_t efi_launch_capsules(void)
 		if (ret == EFI_SUCCESS) {
 			ret = efi_capsule_update_firmware(capsule);
 			if (ret != EFI_SUCCESS)
-				log_err("Applying capsule %ls failed\n",
+				log_err("Applying capsule %ls failed.\n",
 					files[i]);
+			else
+				log_info("Applying capsule %ls succeeded.\n",
+					 files[i]);
 
 			/* create CapsuleXXXX */
 			set_capsule_result(index, capsule, ret);
@@ -1142,6 +1147,19 @@ efi_status_t efi_launch_capsules(void)
 		free(files[i]);
 	free(files);
 
-	return ret;
+	/*
+	 * UEFI spec requires to reset system after complete processing capsule
+	 * update on the storage.
+	 */
+	puts("Reboot after firmware update");
+	if (CONFIG_IS_ENABLED(SYSRESET)) {
+		reset_cpu();
+	} else {
+		do_reset(NULL, 0, 0, NULL);
+		hang();
+	}
+	/* not reach here */
+
+	return 0;
 }
 #endif /* CONFIG_EFI_CAPSULE_ON_DISK */