linux-kernel - [PATCH v2 1/2] efi: add /proc/efi directory

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Date:   Tue,  3 Dec 2019 15:14:09 -0500
From:   Masayoshi Mizuma <msys.mizuma@...il.com>
To:     Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        linux-arm-kernel@...ts.infradead.org, linux-efi@...r.kernel.org
Cc:     Masayoshi Mizuma <msys.mizuma@...il.com>,
        Masayoshi Mizuma <m.mizuma@...fujitsu.com>,
        linux-kernel@...r.kernel.org, kexec@...ts.infradead.org,
        d.hatayama@...itsu.com, Eric Biederman <ebiederm@...ssion.com>,
        Matthias Brugger <matthias.bgg@...il.com>
Subject: [PATCH v2 1/2] efi: add /proc/efi directory

From: Masayoshi Mizuma <m.mizuma@...fujitsu.com>

Add /proc/efi directory to show some efi internal information.

Signed-off-by: Masayoshi Mizuma <m.mizuma@...fujitsu.com>
---
 drivers/firmware/efi/efi.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
index d101f072c..d8157cb34 100644
--- a/drivers/firmware/efi/efi.c
+++ b/drivers/firmware/efi/efi.c
@@ -325,6 +325,22 @@ static __init int efivar_ssdt_load(void)
 static inline int efivar_ssdt_load(void) { return 0; }
 #endif
 
+#ifdef CONFIG_PROC_FS
+static struct proc_dir_entry *proc_efi;
+static int __init efi_proc_init(void)
+{
+	proc_efi = proc_mkdir("efi", NULL);
+	if (!proc_efi) {
+		pr_err("/proc/efi: Cannot create /proc/efi directory.\n");
+		return 1;
+	}
+
+	return 0;
+}
+#else
+static inline int efi_proc_init(void) { return 0; }
+#endif /* CONFIG_PROC_FS */
+
 /*
  * We register the efi subsystem with the firmware subsystem and the
  * efivars subsystem with the efi subsystem, if the system was booted with
@@ -381,6 +397,12 @@ static int __init efisubsys_init(void)
 		goto err_remove_group;
 	}
 
+	error = efi_proc_init();
+	if (error) {
+		sysfs_remove_mount_point(efi_kobj, "efivars");
+		goto err_remove_group;
+	}
+
 	return 0;
 
 err_remove_group:
-- 
2.18.1