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tee: optee: Fix supplicant based device enumeration 

Currently supplicant dependent optee device enumeration only registers
devices whenever tee-supplicant is invoked for the first time. But it
forgets to remove devices when tee-supplicant daemon stops running and
closes its context gracefully. This leads to following error for fTPM
driver during reboot/shutdown:

[   73.466791] tpm tpm0: ftpm_tee_tpm_op_send: SUBMIT_COMMAND invoke error: 0xffff3024

Fix this by adding an attribute for supplicant dependent devices so that
the user-space service can detect and detach supplicant devices before
closing the supplicant:

$ for dev in /sys/bus/tee/devices/*; do if [[ -f "$dev/need_supplicant" && -f "$dev/driver/unbind" ]]; \
      then echo $(basename "$dev") > $dev/driver/unbind; fi done

Reported-by: Jan Kiszka <jan.kiszka@siemens.com>
Closes: https://github.com/OP-TEE/optee_os/issues/6094
Fixes: 5f178bb71e ("optee: enable support for multi-stage bus enumeration")
Signed-off-by: Sumit Garg <sumit.garg@linaro.org>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Acked-by: Jerome Forissier <jerome.forissier@linaro.org>
[jw: fixed up Date documentation]
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
This commit is contained in:
Sumit Garg 2023-11-02 13:00:55 +05:30 committed by Jens Wiklander
parent ffc253263a
commit 7269cba53d
2 changed files with 24 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
Documentation/ABI/testing/sysfs-bus-optee-devices
View File

@ -6,3 +6,12 @@ Description:
OP-TEE bus provides reference to registered drivers under this directory. The <uuid>
matches Trusted Application (TA) driver and corresponding TA in secure OS. Drivers
are free to create needed API under optee-ta-<uuid> directory.
What: /sys/bus/tee/devices/optee-ta-<uuid>/need_supplicant
Date: November 2023
KernelVersion: 6.7
Contact: op-tee@lists.trustedfirmware.org
Description:
Allows to distinguish whether an OP-TEE based TA/device requires user-space
tee-supplicant to function properly or not. This attribute will be present for
devices which depend on tee-supplicant to be running.

17
drivers/tee/optee/device.c
View File

@ -60,7 +60,16 @@ static void optee_release_device(struct device *dev)
kfree(optee_device);
}
static int optee_register_device(const uuid_t *device_uuid)
static ssize_t need_supplicant_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
return 0;
}
static DEVICE_ATTR_RO(need_supplicant);
static int optee_register_device(const uuid_t *device_uuid, u32 func)
{
struct tee_client_device *optee_device = NULL;
int rc;
@ -83,6 +92,10 @@ static int optee_register_device(const uuid_t *device_uuid)
put_device(&optee_device->dev);
}
if (func == PTA_CMD_GET_DEVICES_SUPP)
device_create_file(&optee_device->dev,
&dev_attr_need_supplicant);
return rc;
}
@ -142,7 +155,7 @@ static int __optee_enumerate_devices(u32 func)
num_devices = shm_size / sizeof(uuid_t);
for (idx = 0; idx < num_devices; idx++) {
rc = optee_register_device(&device_uuid[idx]);
rc = optee_register_device(&device_uuid[idx], func);
if (rc)
goto out_shm;
}