This commit adds the functions to register/unregister the tee-based EFI variable driver.
Co-developed-by: Ilias Apalodimas ilias.apalodimas@linaro.org Signed-off-by: Ilias Apalodimas ilias.apalodimas@linaro.org Signed-off-by: Masahisa Kojima masahisa.kojima@linaro.org --- drivers/tee/tee_core.c | 23 +++++++++++++++++++++++ include/linux/tee_drv.h | 23 +++++++++++++++++++++++ 2 files changed, 46 insertions(+)
diff --git a/drivers/tee/tee_core.c b/drivers/tee/tee_core.c index 98da206cd761..0dce5b135d2c 100644 --- a/drivers/tee/tee_core.c +++ b/drivers/tee/tee_core.c @@ -7,6 +7,7 @@
#include <linux/cdev.h> #include <linux/cred.h> +#include <linux/efi.h> #include <linux/fs.h> #include <linux/idr.h> #include <linux/module.h> @@ -1263,6 +1264,28 @@ static void __exit tee_exit(void) tee_class = NULL; }
+void tee_register_efivar_ops(struct efivars *tee_efivars, + struct efivar_operations *ops) +{ + /* + * If the firmware EFI runtime services support SetVariable(), + * tee-based EFI variable services are not used. + */ + if (!efivar_supports_writes()) { + efivars_generic_ops_unregister(); + pr_info("Use tee-based EFI runtime variable services\n"); + efivars_register(tee_efivars, ops); + } +} +EXPORT_SYMBOL_GPL(tee_register_efivar_ops); + +void tee_unregister_efivar_ops(struct efivars *tee_efivars) +{ + efivars_unregister(tee_efivars); + efivars_generic_ops_register(); +} +EXPORT_SYMBOL_GPL(tee_unregister_efivar_ops); + subsys_initcall(tee_init); module_exit(tee_exit);
diff --git a/include/linux/tee_drv.h b/include/linux/tee_drv.h index 17eb1c5205d3..def4ea6212ee 100644 --- a/include/linux/tee_drv.h +++ b/include/linux/tee_drv.h @@ -7,6 +7,7 @@ #define __TEE_DRV_H
#include <linux/device.h> +#include <linux/efi.h> #include <linux/idr.h> #include <linux/kref.h> #include <linux/list.h> @@ -507,4 +508,26 @@ struct tee_context *teedev_open(struct tee_device *teedev); */ void teedev_close_context(struct tee_context *ctx);
+/** + * tee_register_efivar_ops() - register the efivar ops + * @tee_efivars: pointer to efivars structure + * @ops: pointer to contain the efivar operation + * + * This function registers the tee-based efivar operation as an + * EFI Runtime Service. + * + */ +void tee_register_efivar_ops(struct efivars *tee_efivars, + struct efivar_operations *ops); + +/** + * tee_unregister_efivar_ops() - unregister the efivar ops + * @tee_efivars: pointer to efivars structure + * + * This function unregisters the tee-based efivar operation + * and reverts to the generic operation. + * + */ +void tee_unregister_efivar_ops(struct efivars *tee_efivars); + #endif /*__TEE_DRV_H*/