From bade7e1fbd34f46462e6eb1db5474832a4144ac2 Mon Sep 17 00:00:00 2001 From: Rijo Thomas Date: Fri, 27 Dec 2019 10:54:02 +0530 Subject: tee: amdtee: check TEE status during driver initialization The AMD-TEE driver should check if TEE is available before registering itself with TEE subsystem. This ensures that there is a TEE which the driver can talk to before proceeding with tee device node allocation. Cc: Ard Biesheuvel Cc: Tom Lendacky Acked-by: Jens Wiklander Co-developed-by: Devaraj Rangasamy Signed-off-by: Devaraj Rangasamy Signed-off-by: Rijo Thomas Reviewed-by: Gary R Hook Signed-off-by: Herbert Xu --- include/linux/psp-tee.h | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) (limited to 'include/linux') diff --git a/include/linux/psp-tee.h b/include/linux/psp-tee.h index 63bb2212fce0..cb0c95d6d76b 100644 --- a/include/linux/psp-tee.h +++ b/include/linux/psp-tee.h @@ -62,6 +62,19 @@ enum tee_cmd_id { int psp_tee_process_cmd(enum tee_cmd_id cmd_id, void *buf, size_t len, u32 *status); +/** + * psp_check_tee_status() - Checks whether there is a TEE which a driver can + * talk to. + * + * This function can be used by AMD-TEE driver to query if there is TEE with + * which it can communicate. + * + * Returns: + * 0 if the device has TEE + * -%ENODEV if there is no TEE available + */ +int psp_check_tee_status(void); + #else /* !CONFIG_CRYPTO_DEV_SP_PSP */ static inline int psp_tee_process_cmd(enum tee_cmd_id cmd_id, void *buf, @@ -69,5 +82,10 @@ static inline int psp_tee_process_cmd(enum tee_cmd_id cmd_id, void *buf, { return -ENODEV; } + +static inline int psp_check_tee_status(void) +{ + return -ENODEV; +} #endif /* CONFIG_CRYPTO_DEV_SP_PSP */ #endif /* __PSP_TEE_H_ */ -- cgit v1.2.3