diff options
author | Rijo Thomas <Rijo-john.Thomas@amd.com> | 2019-12-27 10:54:02 +0530 |
---|---|---|
committer | Herbert Xu <herbert@gondor.apana.org.au> | 2020-01-04 13:49:51 +0800 |
commit | bade7e1fbd34f46462e6eb1db5474832a4144ac2 (patch) | |
tree | c3c35b39cf2bdc10b841bc0ca21df3844ca74f09 /include | |
parent | 757cc3e9ff1d72d014096399d6e2bf03974d9da1 (diff) |
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 <ard.biesheuvel@linaro.org>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>
Co-developed-by: Devaraj Rangasamy <Devaraj.Rangasamy@amd.com>
Signed-off-by: Devaraj Rangasamy <Devaraj.Rangasamy@amd.com>
Signed-off-by: Rijo Thomas <Rijo-john.Thomas@amd.com>
Reviewed-by: Gary R Hook <gary.hook@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'include')
-rw-r--r-- | include/linux/psp-tee.h | 18 |
1 files changed, 18 insertions, 0 deletions
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_ */ |