Patch "tee: optee: Fix supplicant based device enumeration" has been added to the 6.6-stable tree

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This is a note to let you know that I've just added the patch titled

    tee: optee: Fix supplicant based device enumeration

to the 6.6-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     tee-optee-fix-supplicant-based-device-enumeration.patch
and it can be found in the queue-6.6 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit ba060423ff7ba12aaaa6a0ce353a85d0d2266489
Author: Sumit Garg <sumit.garg@xxxxxxxxxx>
Date:   Thu Nov 2 13:00:55 2023 +0530

    tee: optee: Fix supplicant based device enumeration
    
    [ Upstream commit 7269cba53d906cf257c139d3b3a53ad272176bca ]
    
    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@xxxxxxxxxxx>
    Closes: https://github.com/OP-TEE/optee_os/issues/6094
    Fixes: 5f178bb71e3a ("optee: enable support for multi-stage bus enumeration")
    Signed-off-by: Sumit Garg <sumit.garg@xxxxxxxxxx>
    Reviewed-by: Ilias Apalodimas <ilias.apalodimas@xxxxxxxxxx>
    Acked-by: Jerome Forissier <jerome.forissier@xxxxxxxxxx>
    [jw: fixed up Date documentation]
    Signed-off-by: Jens Wiklander <jens.wiklander@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/Documentation/ABI/testing/sysfs-bus-optee-devices b/Documentation/ABI/testing/sysfs-bus-optee-devices
index 0f58701367b66..af31e5a22d89f 100644
--- a/Documentation/ABI/testing/sysfs-bus-optee-devices
+++ b/Documentation/ABI/testing/sysfs-bus-optee-devices
@@ -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@xxxxxxxxxxxxxxxxxxxxxxxxx
+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.
diff --git a/drivers/tee/optee/device.c b/drivers/tee/optee/device.c
index 64f0e047c23d2..4b10921276942 100644
--- a/drivers/tee/optee/device.c
+++ b/drivers/tee/optee/device.c
@@ -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;
 	}




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