[PATCH v4 0/2] tee: optee: Fixes for supplicant dependent enumeration

[PATCH v4 0/2] tee: optee: Fixes for supplicant dependent enumeration

[Sumit Garg]

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

While at it use the global system workqueue for OP-TEE bus scanning work
rather than our own custom one.

Changes in v4:
- Changing the device name would be an ABI break, rather switch to
  additional device attribute: "need_supplicant" to distinguish for ABI
  compatibility.
- Dropped tested-by for patch #1, I would encourage folks to retest
  this.

Changes in v3:

- Split patch into 2 separate ones, one for supplicant fix and other for
  the workqueue.

Changes in v2:

- Use device names to separate out tee-supplicant dependent devices via
  this patch.
- Since user-space service is aware about tee-supplicant lifespan, so
  allow the user-space service to unbind tee-supplicant dependent
  devices before killing the supplicant. Following command has to be
  added to the tee-supplicant service file.

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

Sumit Garg (2):
  tee: optee: Fix supplicant based device enumeration
  tee: optee: Remove redundant custom workqueue

 .../ABI/testing/sysfs-bus-optee-devices         |  9 +++++++++
 drivers/tee/optee/core.c                        | 13 ++-----------
 drivers/tee/optee/device.c                      | 17 +++++++++++++++--
 drivers/tee/optee/optee_private.h               |  2 --
 4 files changed, 26 insertions(+), 15 deletions(-)

-- 
2.34.1

[PATCH v4 1/2] tee: optee: Fix supplicant based device enumeration

[Sumit Garg]

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>
Link: 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@linaro.org>
---
 .../ABI/testing/sysfs-bus-optee-devices         |  9 +++++++++
 drivers/tee/optee/device.c                      | 17 +++++++++++++++--
 2 files changed, 24 insertions(+), 2 deletions(-)

diff --git a/Documentation/ABI/testing/sysfs-bus-optee-devices b/Documentation/ABI/testing/sysfs-bus-optee-devices
index 0f58701367b6..d914f6629662 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:		July 2008
+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.
diff --git a/drivers/tee/optee/device.c b/drivers/tee/optee/device.c
index 64f0e047c23d..4b1092127694 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;
 	}
-- 
2.34.1

[PATCH v4 2/2] tee: optee: Remove redundant custom workqueue

[Sumit Garg]

Global system workqueue is sufficient to suffice OP-TEE bus scanning work
needs. So drop redundant usage of the custom workqueue.

Tested-by: Jan Kiszka <jan.kiszka@siemens.com>
Tested-by: Masahisa Kojima <masahisa.kojima@linaro.org>
Signed-off-by: Sumit Garg <sumit.garg@linaro.org>
---
 drivers/tee/optee/core.c          | 13 ++-----------
 drivers/tee/optee/optee_private.h |  2 --
 2 files changed, 2 insertions(+), 13 deletions(-)

diff --git a/drivers/tee/optee/core.c b/drivers/tee/optee/core.c
index 2a258bd3b6b5..1eaa191b6ff6 100644
--- a/drivers/tee/optee/core.c
+++ b/drivers/tee/optee/core.c
@@ -15,7 +15,6 @@
 #include <linux/string.h>
 #include <linux/tee_drv.h>
 #include <linux/types.h>
-#include <linux/workqueue.h>
 #include "optee_private.h"
 
 int optee_pool_op_alloc_helper(struct tee_shm_pool *pool, struct tee_shm *shm,
@@ -110,12 +109,7 @@ int optee_open(struct tee_context *ctx, bool cap_memref_null)
 
 		if (!optee->scan_bus_done) {
 			INIT_WORK(&optee->scan_bus_work, optee_bus_scan);
-			optee->scan_bus_wq = create_workqueue("optee_bus_scan");
-			if (!optee->scan_bus_wq) {
-				kfree(ctxdata);
-				return -ECHILD;
-			}
-			queue_work(optee->scan_bus_wq, &optee->scan_bus_work);
+			schedule_work(&optee->scan_bus_work);
 			optee->scan_bus_done = true;
 		}
 	}
@@ -158,10 +152,7 @@ void optee_release_supp(struct tee_context *ctx)
 	struct optee *optee = tee_get_drvdata(ctx->teedev);
 
 	optee_release_helper(ctx, optee_close_session_helper);
-	if (optee->scan_bus_wq) {
-		destroy_workqueue(optee->scan_bus_wq);
-		optee->scan_bus_wq = NULL;
-	}
+
 	optee_supp_release(&optee->supp);
 }
 
diff --git a/drivers/tee/optee/optee_private.h b/drivers/tee/optee/optee_private.h
index 6bb5cae09688..94c0ee381894 100644
--- a/drivers/tee/optee/optee_private.h
+++ b/drivers/tee/optee/optee_private.h
@@ -178,7 +178,6 @@ struct optee_ops {
  * @pool:		shared memory pool
  * @rpc_param_count:	If > 0 number of RPC parameters to make room for
  * @scan_bus_done	flag if device registation was already done.
- * @scan_bus_wq		workqueue to scan optee bus and register optee drivers
  * @scan_bus_work	workq to scan optee bus and register optee drivers
  */
 struct optee {
@@ -197,7 +196,6 @@ struct optee {
 	struct tee_shm_pool *pool;
 	unsigned int rpc_param_count;
 	bool   scan_bus_done;
-	struct workqueue_struct *scan_bus_wq;
 	struct work_struct scan_bus_work;
 };
 
-- 
2.34.1

Re: [PATCH v4 1/2] tee: optee: Fix supplicant based device enumeration

[Jerome Forissier]

On 11/2/23 08:30, 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 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>
> Link: 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@linaro.org>
> ---
>  .../ABI/testing/sysfs-bus-optee-devices         |  9 +++++++++
>  drivers/tee/optee/device.c                      | 17 +++++++++++++++--
>  2 files changed, 24 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/ABI/testing/sysfs-bus-optee-devices b/Documentation/ABI/testing/sysfs-bus-optee-devices
> index 0f58701367b6..d914f6629662 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:		July 2008
> +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.
> diff --git a/drivers/tee/optee/device.c b/drivers/tee/optee/device.c
> index 64f0e047c23d..4b1092127694 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;
>  	}

Acked-by: Jerome Forissier <jerome.forissier@linaro.org>

Thanks!

-- 
Jerome

Re: [PATCH v4 1/2] tee: optee: Fix supplicant based device enumeration

[Ilias Apalodimas]

Hi Sumit,

On Thu, 2 Nov 2023 at 09:31, Sumit Garg <sumit.garg@linaro.org> 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 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>
> Link: 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@linaro.org>
> ---
>  .../ABI/testing/sysfs-bus-optee-devices         |  9 +++++++++
>  drivers/tee/optee/device.c                      | 17 +++++++++++++++--
>  2 files changed, 24 insertions(+), 2 deletions(-)
>
> diff --git a/Documentation/ABI/testing/sysfs-bus-optee-devices b/Documentation/ABI/testing/sysfs-bus-optee-devices
> index 0f58701367b6..d914f6629662 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:          July 2008

nit, date needs changing

> +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.
> diff --git a/drivers/tee/optee/device.c b/drivers/tee/optee/device.c
> index 64f0e047c23d..4b1092127694 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

(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;
>         }
> --
> 2.34.1
>

Other than that
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>

Re: [PATCH v4 1/2] tee: optee: Fix supplicant based device enumeration

[Sumit Garg]

Hi Ilias,

On Thu, 2 Nov 2023 at 19:58, Ilias Apalodimas
<ilias.apalodimas@linaro.org> wrote:
>
> Hi Sumit,
>
> On Thu, 2 Nov 2023 at 09:31, Sumit Garg <sumit.garg@linaro.org> 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 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>
> > Link: 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@linaro.org>
> > ---
> >  .../ABI/testing/sysfs-bus-optee-devices         |  9 +++++++++
> >  drivers/tee/optee/device.c                      | 17 +++++++++++++++--
> >  2 files changed, 24 insertions(+), 2 deletions(-)
> >
> > diff --git a/Documentation/ABI/testing/sysfs-bus-optee-devices b/Documentation/ABI/testing/sysfs-bus-optee-devices
> > index 0f58701367b6..d914f6629662 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:          July 2008
>
> nit, date needs changing
>

Thanks for catching that. If nothing major comes up then I hope Jens
can correct it while applying.

> > +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.
> > diff --git a/drivers/tee/optee/device.c b/drivers/tee/optee/device.c
> > index 64f0e047c23d..4b1092127694 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
>
> (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;
> >         }
> > --
> > 2.34.1
> >
>
> Other than that
> Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>

Thanks.

-Sumit

Re: [PATCH v4 1/2] tee: optee: Fix supplicant based device enumeration

[Jens Wiklander]

Hi,

On Fri, Nov 3, 2023 at 6:52 AM Sumit Garg <sumit.garg@linaro.org> wrote:
>
> Hi Ilias,
>
> On Thu, 2 Nov 2023 at 19:58, Ilias Apalodimas
> <ilias.apalodimas@linaro.org> wrote:
> >
> > Hi Sumit,
> >
> > On Thu, 2 Nov 2023 at 09:31, Sumit Garg <sumit.garg@linaro.org> 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 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>
> > > Link: https://github.com/OP-TEE/optee_os/issues/6094

Checkpatch complains here, we should use "Closes:" instead of "Link:".

> > > Fixes: 5f178bb71e3a ("optee: enable support for multi-stage bus enumeration")
> > > Signed-off-by: Sumit Garg <sumit.garg@linaro.org>
> > > ---
> > >  .../ABI/testing/sysfs-bus-optee-devices         |  9 +++++++++
> > >  drivers/tee/optee/device.c                      | 17 +++++++++++++++--
> > >  2 files changed, 24 insertions(+), 2 deletions(-)
> > >
> > > diff --git a/Documentation/ABI/testing/sysfs-bus-optee-devices b/Documentation/ABI/testing/sysfs-bus-optee-devices
> > > index 0f58701367b6..d914f6629662 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:          July 2008
> >
> > nit, date needs changing
> >
>
> Thanks for catching that. If nothing major comes up then I hope Jens
> can correct it while applying.

Sure, I can update it to November 2023.

I'll fix the date and the "Closes:" tag if there's no v5.

Cheers,
Jens

>
> > > +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.
> > > diff --git a/drivers/tee/optee/device.c b/drivers/tee/optee/device.c
> > > index 64f0e047c23d..4b1092127694 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
> >
> > (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;
> > >         }
> > > --
> > > 2.34.1
> > >
> >
> > Other than that
> > Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
>
> Thanks.
>
> -Sumit

Re: [PATCH v4 0/2] tee: optee: Fixes for supplicant dependent enumeration

[Jens Wiklander]

On Thu, Nov 2, 2023 at 8:31 AM Sumit Garg <sumit.garg@linaro.org> 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 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
>
> While at it use the global system workqueue for OP-TEE bus scanning work
> rather than our own custom one.
>
> Changes in v4:
> - Changing the device name would be an ABI break, rather switch to
>   additional device attribute: "need_supplicant" to distinguish for ABI
>   compatibility.
> - Dropped tested-by for patch #1, I would encourage folks to retest
>   this.
>
> Changes in v3:
>
> - Split patch into 2 separate ones, one for supplicant fix and other for
>   the workqueue.
>
> Changes in v2:
>
> - Use device names to separate out tee-supplicant dependent devices via
>   this patch.
> - Since user-space service is aware about tee-supplicant lifespan, so
>   allow the user-space service to unbind tee-supplicant dependent
>   devices before killing the supplicant. Following command has to be
>   added to the tee-supplicant service file.
>
>   $ for dev in /sys/bus/tee/devices/*; do if [[ "$dev" == *"optee-ta-supp-"* ]]; \
>         then echo $(basename "$dev") > $dev/driver/unbind; fi done
>
> Sumit Garg (2):
>   tee: optee: Fix supplicant based device enumeration
>   tee: optee: Remove redundant custom workqueue
>
>  .../ABI/testing/sysfs-bus-optee-devices         |  9 +++++++++
>  drivers/tee/optee/core.c                        | 13 ++-----------
>  drivers/tee/optee/device.c                      | 17 +++++++++++++++--
>  drivers/tee/optee/optee_private.h               |  2 --
>  4 files changed, 26 insertions(+), 15 deletions(-)
>
> --
> 2.34.1
>

I'm picking up this.

Thanks,
Jens