linux-kernel - [RFC PATCH 1/2] efi: expose efivar generic ops register function

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Message-Id: <20230126132120.1661-2-masahisa.kojima@linaro.org>
Date:   Thu, 26 Jan 2023 22:21:18 +0900
From:   Masahisa Kojima <masahisa.kojima@...aro.org>
To:     Ard Biesheuvel <ardb@...nel.org>,
        Jens Wiklander <jens.wiklander@...aro.org>,
        linux-kernel@...r.kernel.org, op-tee@...ts.trustedfirmware.org
Cc:     Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        Johan Hovold <johan+linaro@...nel.org>,
        Masahisa Kojima <masahisa.kojima@...aro.org>,
        linux-efi@...r.kernel.org
Subject: [RFC PATCH 1/2] efi: expose efivar generic ops register function

This is a preparation for supporting efivar operations
provided by other than efi subsystem.
Both register and unregister functions are exposed
so that non-efi subsystem can revert the efi generic
operation.

Co-developed-by: Ilias Apalodimas <ilias.apalodimas@...aro.org>
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@...aro.org>
Signed-off-by: Masahisa Kojima <masahisa.kojima@...aro.org>
---
 drivers/firmware/efi/efi.c | 12 ++++++++++++
 include/linux/efi.h        |  3 +++
 2 files changed, 15 insertions(+)

diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
index 52146f95d58e..4e576b62c170 100644
--- a/drivers/firmware/efi/efi.c
+++ b/drivers/firmware/efi/efi.c
@@ -227,6 +227,18 @@ static void generic_ops_unregister(void)
 	efivars_unregister(&generic_efivars);
 }
 
+void efivars_generic_ops_register(void)
+{
+	generic_ops_register();
+}
+EXPORT_SYMBOL_GPL(efivars_generic_ops_register);
+
+void efivars_generic_ops_unregister(void)
+{
+	generic_ops_unregister();
+}
+EXPORT_SYMBOL_GPL(efivars_generic_ops_unregister);
+
 #ifdef CONFIG_EFI_CUSTOM_SSDT_OVERLAYS
 #define EFIVAR_SSDT_NAME_MAX	16UL
 static char efivar_ssdt[EFIVAR_SSDT_NAME_MAX] __initdata;
diff --git a/include/linux/efi.h b/include/linux/efi.h
index 1a1adc8d3ba3..5e301c00e9b0 100644
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -1332,4 +1332,7 @@ bool efi_config_table_is_usable(const efi_guid_t *guid, unsigned long table)
 	return xen_efi_config_table_is_usable(guid, table);
 }
 
+void efivars_generic_ops_register(void);
+void efivars_generic_ops_unregister(void);
+
 #endif /* _LINUX_EFI_H */
-- 
2.30.2