linux-kernel - Re: [PATCH v3 1/2] tee: optee: Fix supplicant based device enumeration

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Date:   Tue, 31 Oct 2023 12:04:19 +0100
From:   Jerome Forissier <jerome.forissier@...aro.org>
To:     Sumit Garg <sumit.garg@...aro.org>, jens.wiklander@...aro.org,
        op-tee@...ts.trustedfirmware.org
Cc:     jan.kiszka@...mens.com, arnd@...aro.org, ardb@...nel.org,
        ilias.apalodimas@...aro.org, masahisa.kojima@...aro.org,
        maxim.uvarov@...aro.org, jarkko.sakkinen@...ux.intel.com,
        linux-kernel@...r.kernel.org, diogo.ivo@...mens.com
Subject: Re: [PATCH v3 1/2] tee: optee: Fix supplicant based device
 enumeration



On 10/30/23 16:59, Sumit Garg wrote:
> 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 separating supplicant dependent devices so that the
> user-space service can detach supplicant devices before closing the
> supplicant.
> 
> Reported-by: Jan Kiszka <jan.kiszka@...mens.com>
> Link: https://github.com/OP-TEE/optee_os/issues/6094
> Fixes: 5f178bb71e3a ("optee: enable support for multi-stage bus enumeration")
> Tested-by: Jan Kiszka <jan.kiszka@...mens.com>
> Tested-by: Masahisa Kojima <masahisa.kojima@...aro.org>
> Signed-off-by: Sumit Garg <sumit.garg@...aro.org>
> ---
>  drivers/tee/optee/device.c | 13 ++++++++++---
>  1 file changed, 10 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/tee/optee/device.c b/drivers/tee/optee/device.c
> index 64f0e047c23d..78fc0a15c463 100644
> --- a/drivers/tee/optee/device.c
> +++ b/drivers/tee/optee/device.c
> @@ -60,9 +60,10 @@ static void optee_release_device(struct device *dev)
>  	kfree(optee_device);
>  }
>  
> -static int optee_register_device(const uuid_t *device_uuid)
> +static int optee_register_device(const uuid_t *device_uuid, u32 func)
>  {
>  	struct tee_client_device *optee_device = NULL;
> +	const char *dev_name_fmt = NULL;
>  	int rc;
>  
>  	optee_device = kzalloc(sizeof(*optee_device), GFP_KERNEL);
> @@ -71,7 +72,13 @@ static int optee_register_device(const uuid_t *device_uuid)
>  
>  	optee_device->dev.bus = &tee_bus_type;
>  	optee_device->dev.release = optee_release_device;
> -	if (dev_set_name(&optee_device->dev, "optee-ta-%pUb", device_uuid)) {
> +
> +	if (func == PTA_CMD_GET_DEVICES_SUPP)
> +		dev_name_fmt = "optee-ta-supp-%pUb";
> +	else
> +		dev_name_fmt = "optee-ta-%pUb";

That's an ABI change, isn't it?

> +
> +	if (dev_set_name(&optee_device->dev, dev_name_fmt, device_uuid)) {
>  		kfree(optee_device);
>  		return -ENOMEM;
>  	}
> @@ -142,7 +149,7 @@ 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;
>  	}

-- 
Jerome