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tee: amdtee: check TEE status during driver initialization

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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>
This commit is contained in:
Rijo Thomas
2019-12-27 10:54:02 +05:30
committed by Herbert Xu
parent 757cc3e9ff
commit bade7e1fbd
3 changed files with 35 additions and 0 deletions
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6
drivers/tee/amdtee/core.c
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@@ -16,6 +16,7 @@
#include <linux/firmware.h>
#include "amdtee_private.h"
#include "../tee_private.h"
#include <linux/psp-tee.h>
static struct amdtee_driver_data *drv_data;
static DEFINE_MUTEX(session_list_mutex);
@@ -438,6 +439,10 @@ static int __init amdtee_driver_init(void)
struct tee_shm_pool *pool = ERR_PTR(-EINVAL);
int rc;
rc = psp_check_tee_status();
if (rc)
goto err_fail;
drv_data = kzalloc(sizeof(*drv_data), GFP_KERNEL);
if (IS_ERR(drv_data))
return -ENOMEM;
@@ -485,6 +490,7 @@ err_kfree_drv_data:
kfree(drv_data);
drv_data = NULL;
err_fail:
pr_err("amd-tee driver initialization failed\n");
return rc;
}