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optee: use uuid for sysfs driver entry

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With the evolving use-cases for TEE bus, now it's required to support
multi-stage enumeration process. But using a simple index doesn't
suffice this requirement and instead leads to duplicate sysfs entries.
So instead switch to use more informative device UUID for sysfs entry
like:
/sys/bus/tee/devices/optee-ta-<uuid>

Signed-off-by: Maxim Uvarov <maxim.uvarov@linaro.org>
Reviewed-by: Sumit Garg <sumit.garg@linaro.org>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Tested-by: Sumit Garg <sumit.garg@linaro.org>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
This commit is contained in:
Maxim Uvarov 2020-06-18 16:52:49 +03:00 committed by Jens Wiklander
parent 3d77e6a880
commit 58df195cd4
3 changed files with 15 additions and 3 deletions
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8
Documentation/ABI/testing/sysfs-bus-optee-devices Normal file
View file

@ -0,0 +1,8 @@
What: /sys/bus/tee/devices/optee-ta-<uuid>/
Date: May 2020
KernelVersion 5.8
Contact: op-tee@lists.trustedfirmware.org
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.

1
MAINTAINERS
View file

@ -12528,6 +12528,7 @@ OP-TEE DRIVER
M: Jens Wiklander <jens.wiklander@linaro.org>
L: tee-dev@lists.linaro.org
S: Maintained
F: Documentation/ABI/testing/sysfs-bus-optee-devices
F: drivers/tee/optee/
OP-TEE RANDOM NUMBER GENERATOR (RNG) DRIVER

9
drivers/tee/optee/device.c
View file

@ -65,7 +65,7 @@ static int get_devices(struct tee_context *ctx, u32 session,
return 0;
}
static int optee_register_device(const uuid_t *device_uuid, u32 device_id)
static int optee_register_device(const uuid_t *device_uuid)
{
struct tee_client_device *optee_device = NULL;
int rc;
@ -75,7 +75,10 @@ static int optee_register_device(const uuid_t *device_uuid, u32 device_id)
return -ENOMEM;
optee_device->dev.bus = &tee_bus_type;
dev_set_name(&optee_device->dev, "optee-clnt%u", device_id);
if (dev_set_name(&optee_device->dev, "optee-ta-%pUb", device_uuid)) {
kfree(optee_device);
return -ENOMEM;
}
uuid_copy(&optee_device->id.uuid, device_uuid);
rc = device_register(&optee_device->dev);
@ -144,7 +147,7 @@ int optee_enumerate_devices(void)
num_devices = shm_size / sizeof(uuid_t);
for (idx = 0; idx < num_devices; idx++) {
rc = optee_register_device(&device_uuid[idx], idx);
rc = optee_register_device(&device_uuid[idx]);
if (rc)
goto out_shm;
}