linux-kernel - [PATCH 1/2] efi: add a function for transferring status to string

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Date:   Fri, 22 Mar 2019 18:33:49 +0800
From:   "Lee, Chun-Yi" <joeyli.kernel@...il.com>
To:     Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        James Morris <jmorris@...ei.org>,
        "Serge E . Hallyn" <serge@...lyn.com>,
        David Howells <dhowells@...hat.com>,
        Josh Boyer <jwboyer@...oraproject.org>,
        Nayna Jain <nayna@...ux.ibm.com>,
        Mimi Zohar <zohar@...ux.ibm.com>
Cc:     linux-efi@...r.kernel.org, linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org, "Lee, Chun-Yi" <jlee@...e.com>,
        Kees Cook <keescook@...omium.org>,
        Anton Vorontsov <anton@...msg.org>,
        Colin Cross <ccross@...roid.com>,
        Tony Luck <tony.luck@...el.com>
Subject: [PATCH 1/2] efi: add a function for transferring status to string

This function can be used to transfer EFI status code to string
for printing out debug message. Using this function can improve
the readability of log.

Cc: Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc: Kees Cook <keescook@...omium.org>
Cc: Anton Vorontsov <anton@...msg.org>
Cc: Colin Cross <ccross@...roid.com>
Cc: Tony Luck <tony.luck@...el.com>
Signed-off-by: "Lee, Chun-Yi" <jlee@...e.com>
---
 include/linux/efi.h | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/include/linux/efi.h b/include/linux/efi.h
index 54357a258b35..a43cb0dc37af 100644
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -1768,4 +1768,32 @@ struct linux_efi_memreserve {
 #define EFI_MEMRESERVE_COUNT(size) (((size) - sizeof(struct linux_efi_memreserve)) \
 	/ sizeof(((struct linux_efi_memreserve *)0)->entry[0]))
 
+#define EFI_STATUS_STR(_status) \
+case EFI_##_status: \
+	return "EFI_" __stringify(_status);
+
+static inline char *
+efi_status_to_str(efi_status_t status)
+{
+	switch (status) {
+	EFI_STATUS_STR(SUCCESS)
+	EFI_STATUS_STR(LOAD_ERROR)
+	EFI_STATUS_STR(INVALID_PARAMETER)
+	EFI_STATUS_STR(UNSUPPORTED)
+	EFI_STATUS_STR(BAD_BUFFER_SIZE)
+	EFI_STATUS_STR(BUFFER_TOO_SMALL)
+	EFI_STATUS_STR(NOT_READY)
+	EFI_STATUS_STR(DEVICE_ERROR)
+	EFI_STATUS_STR(WRITE_PROTECTED)
+	EFI_STATUS_STR(OUT_OF_RESOURCES)
+	EFI_STATUS_STR(NOT_FOUND)
+	EFI_STATUS_STR(ABORTED)
+	EFI_STATUS_STR(SECURITY_VIOLATION)
+	default:
+		pr_warn("Unknown efi status: 0x%lx", status);
+	}
+
+	return "Unknown efi status";
+}
+
 #endif /* _LINUX_EFI_H */
-- 
2.16.4