Hi Masahisa,
On Mon, 20 Feb 2023 at 10:47, Masahisa Kojima masahisa.kojima@linaro.org wrote:
This commit adds the functions to register/unregister the tee-based EFI variable driver.
I am unsure if this commit adds any value now since the TEE StMM EFI driver should be able to directly use efivars_{register/unregister}() APIs. Do you expect any other TEE kernel driver to use these?
-Sumit
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*/
2.30.2