v7: - check return value of dev_set_name() (Jarkko Sakkinen)
v6: - description, comments, patches reorder and destroy workqueue (Sumit Garg)
v5: - removed pr_err and fix typos in description (Jarkko Sakkinen)
- added missed kfree in optee_open()
v4: - sysfs entry is optee-ta-uuid (Jerome Forissier, Sumit Garg)
- added Documentation/ABI/testing/sysfs-bus-optee-devices (Greg Kroah-Hartman)
v3: - support tee-suppicant restart (Jens Wiklander)
- description and comments (Jarkko Sakkinen)
- do not name optee drivers by index in sysfs (Sumit Garg)
v2: - write TEE with capital letters.
- declare __optee_enumerate_device() as static.
Maxim Uvarov (3):
optee: use uuid for sysfs driver entry
optee: enable support for multi-stage bus enumeration
tpm_ftpm_tee: register driver on TEE bus
.../ABI/testing/sysfs-bus-optee-devices | 8 +++
MAINTAINERS | 1 +
drivers/char/tpm/tpm_ftpm_tee.c | 70 ++++++++++++++++---
drivers/tee/optee/core.c | 27 ++++++-
drivers/tee/optee/device.c | 38 +++++-----
drivers/tee/optee/optee_private.h | 10 ++-
6 files changed, 119 insertions(+), 35 deletions(-)
create mode 100644 Documentation/ABI/testing/sysfs-bus-optee-devices
--
2.17.1
Some drivers (like ftpm) can operate only after tee-supplicant
runs because of tee-supplicant provides things like storage
services (rpmb, shm). This patch splits probe of non tee-supplicant
dependable drivers to the early stage, and after tee-supplicant run
probe other drivers.
Signed-off-by: Maxim Uvarov <[email protected]>
Suggested-by: Sumit Garg <[email protected]>
Suggested-by: Arnd Bergmann <[email protected]>
Reviewed-by: Sumit Garg <[email protected]>
---
drivers/tee/optee/core.c | 27 ++++++++++++++++++++++++---
drivers/tee/optee/device.c | 29 +++++++++++------------------
drivers/tee/optee/optee_private.h | 10 +++++++++-
3 files changed, 44 insertions(+), 22 deletions(-)
diff --git a/drivers/tee/optee/core.c b/drivers/tee/optee/core.c
index 99698b8a3a74..b373b1b08b6d 100644
--- a/drivers/tee/optee/core.c
+++ b/drivers/tee/optee/core.c
@@ -17,6 +17,7 @@
#include <linux/tee_drv.h>
#include <linux/types.h>
#include <linux/uaccess.h>
+#include <linux/workqueue.h>
#include "optee_private.h"
#include "optee_smc.h"
#include "shm_pool.h"
@@ -218,6 +219,11 @@ static void optee_get_version(struct tee_device *teedev,
*vers = v;
}
+static void optee_bus_scan(struct work_struct *work)
+{
+ WARN_ON(optee_enumerate_devices(PTA_CMD_GET_DEVICES_SUPP));
+}
+
static int optee_open(struct tee_context *ctx)
{
struct optee_context_data *ctxdata;
@@ -241,8 +247,18 @@ static int optee_open(struct tee_context *ctx)
kfree(ctxdata);
return -EBUSY;
}
- }
+ 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);
+ optee->scan_bus_done = true;
+ }
+ }
mutex_init(&ctxdata->mutex);
INIT_LIST_HEAD(&ctxdata->sess_list);
@@ -296,8 +312,13 @@ static void optee_release(struct tee_context *ctx)
ctx->data = NULL;
- if (teedev == optee->supp_teedev)
+ if (teedev == optee->supp_teedev) {
+ if (optee->scan_bus_wq) {
+ destroy_workqueue(optee->scan_bus_wq);
+ optee->scan_bus_wq = NULL;
+ }
optee_supp_release(&optee->supp);
+ }
}
static const struct tee_driver_ops optee_ops = {
@@ -675,7 +696,7 @@ static int optee_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, optee);
- rc = optee_enumerate_devices();
+ rc = optee_enumerate_devices(PTA_CMD_GET_DEVICES);
if (rc) {
optee_remove(pdev);
return rc;
diff --git a/drivers/tee/optee/device.c b/drivers/tee/optee/device.c
index 14d335cf8d34..663c4c90a063 100644
--- a/drivers/tee/optee/device.c
+++ b/drivers/tee/optee/device.c
@@ -11,18 +11,6 @@
#include <linux/uuid.h>
#include "optee_private.h"
-/*
- * Get device UUIDs
- *
- * [out] memref[0] Array of device UUIDs
- *
- * Return codes:
- * TEE_SUCCESS - Invoke command success
- * TEE_ERROR_BAD_PARAMETERS - Incorrect input param
- * TEE_ERROR_SHORT_BUFFER - Output buffer size less than required
- */
-#define PTA_CMD_GET_DEVICES 0x0
-
static int optee_ctx_match(struct tee_ioctl_version_data *ver, const void *data)
{
if (ver->impl_id == TEE_IMPL_ID_OPTEE)
@@ -32,7 +20,8 @@ static int optee_ctx_match(struct tee_ioctl_version_data *ver, const void *data)
}
static int get_devices(struct tee_context *ctx, u32 session,
- struct tee_shm *device_shm, u32 *shm_size)
+ struct tee_shm *device_shm, u32 *shm_size,
+ u32 func)
{
int ret = 0;
struct tee_ioctl_invoke_arg inv_arg;
@@ -41,8 +30,7 @@ static int get_devices(struct tee_context *ctx, u32 session,
memset(&inv_arg, 0, sizeof(inv_arg));
memset(¶m, 0, sizeof(param));
- /* Invoke PTA_CMD_GET_DEVICES function */
- inv_arg.func = PTA_CMD_GET_DEVICES;
+ inv_arg.func = func;
inv_arg.session = session;
inv_arg.num_params = 4;
@@ -90,7 +78,7 @@ static int optee_register_device(const uuid_t *device_uuid)
return rc;
}
-int optee_enumerate_devices(void)
+static int __optee_enumerate_devices(u32 func)
{
const uuid_t pta_uuid =
UUID_INIT(0x7011a688, 0xddde, 0x4053,
@@ -121,7 +109,7 @@ int optee_enumerate_devices(void)
goto out_ctx;
}
- rc = get_devices(ctx, sess_arg.session, NULL, &shm_size);
+ rc = get_devices(ctx, sess_arg.session, NULL, &shm_size, func);
if (rc < 0 || !shm_size)
goto out_sess;
@@ -133,7 +121,7 @@ int optee_enumerate_devices(void)
goto out_sess;
}
- rc = get_devices(ctx, sess_arg.session, device_shm, &shm_size);
+ rc = get_devices(ctx, sess_arg.session, device_shm, &shm_size, func);
if (rc < 0)
goto out_shm;
@@ -161,3 +149,8 @@ int optee_enumerate_devices(void)
return rc;
}
+
+int optee_enumerate_devices(u32 func)
+{
+ return __optee_enumerate_devices(func);
+}
diff --git a/drivers/tee/optee/optee_private.h b/drivers/tee/optee/optee_private.h
index d9c5037b4e03..8b71839a357e 100644
--- a/drivers/tee/optee/optee_private.h
+++ b/drivers/tee/optee/optee_private.h
@@ -78,6 +78,9 @@ struct optee_supp {
* @memremaped_shm virtual address of memory in shared memory pool
* @sec_caps: secure world capabilities defined by
* OPTEE_SMC_SEC_CAP_* in optee_smc.h
+ * @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 {
struct tee_device *supp_teedev;
@@ -89,6 +92,9 @@ struct optee {
struct tee_shm_pool *pool;
void *memremaped_shm;
u32 sec_caps;
+ bool scan_bus_done;
+ struct workqueue_struct *scan_bus_wq;
+ struct work_struct scan_bus_work;
};
struct optee_session {
@@ -173,7 +179,9 @@ void optee_free_pages_list(void *array, size_t num_entries);
void optee_fill_pages_list(u64 *dst, struct page **pages, int num_pages,
size_t page_offset);
-int optee_enumerate_devices(void);
+#define PTA_CMD_GET_DEVICES 0x0
+#define PTA_CMD_GET_DEVICES_SUPP 0x1
+int optee_enumerate_devices(u32 func);
/*
* Small helpers
--
2.17.1
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 <[email protected]>
Reviewed-by: Sumit Garg <[email protected]>
---
Documentation/ABI/testing/sysfs-bus-optee-devices | 8 ++++++++
MAINTAINERS | 1 +
drivers/tee/optee/device.c | 9 ++++++---
3 files changed, 15 insertions(+), 3 deletions(-)
create mode 100644 Documentation/ABI/testing/sysfs-bus-optee-devices
diff --git a/Documentation/ABI/testing/sysfs-bus-optee-devices b/Documentation/ABI/testing/sysfs-bus-optee-devices
new file mode 100644
index 000000000000..0ae04ae5374a
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-bus-optee-devices
@@ -0,0 +1,8 @@
+What: /sys/bus/tee/devices/optee-ta-<uuid>/
+Date: May 2020
+KernelVersion 5.7
+Contact: [email protected]
+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.
diff --git a/MAINTAINERS b/MAINTAINERS
index ecc0749810b0..6717afef2de3 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -12516,6 +12516,7 @@ OP-TEE DRIVER
M: Jens Wiklander <[email protected]>
L: [email protected]
S: Maintained
+F: Documentation/ABI/testing/sysfs-bus-optee-devices
F: drivers/tee/optee/
OP-TEE RANDOM NUMBER GENERATOR (RNG) DRIVER
diff --git a/drivers/tee/optee/device.c b/drivers/tee/optee/device.c
index e3a148521ec1..14d335cf8d34 100644
--- a/drivers/tee/optee/device.c
+++ b/drivers/tee/optee/device.c
@@ -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-%pUl", 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;
}
--
2.17.1
On Thu, 4 Jun 2020 at 18:03, Maxim Uvarov <[email protected]> wrote:
>
> 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 <[email protected]>
> Reviewed-by: Sumit Garg <[email protected]>
> ---
> Documentation/ABI/testing/sysfs-bus-optee-devices | 8 ++++++++
> MAINTAINERS | 1 +
> drivers/tee/optee/device.c | 9 ++++++---
> 3 files changed, 15 insertions(+), 3 deletions(-)
> create mode 100644 Documentation/ABI/testing/sysfs-bus-optee-devices
>
> diff --git a/Documentation/ABI/testing/sysfs-bus-optee-devices b/Documentation/ABI/testing/sysfs-bus-optee-devices
> new file mode 100644
> index 000000000000..0ae04ae5374a
> --- /dev/null
> +++ b/Documentation/ABI/testing/sysfs-bus-optee-devices
> @@ -0,0 +1,8 @@
> +What: /sys/bus/tee/devices/optee-ta-<uuid>/
> +Date: May 2020
> +KernelVersion 5.7
> +Contact: [email protected]
> +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.
> diff --git a/MAINTAINERS b/MAINTAINERS
> index ecc0749810b0..6717afef2de3 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -12516,6 +12516,7 @@ OP-TEE DRIVER
> M: Jens Wiklander <[email protected]>
> L: [email protected]
> S: Maintained
> +F: Documentation/ABI/testing/sysfs-bus-optee-devices
> F: drivers/tee/optee/
>
> OP-TEE RANDOM NUMBER GENERATOR (RNG) DRIVER
> diff --git a/drivers/tee/optee/device.c b/drivers/tee/optee/device.c
> index e3a148521ec1..14d335cf8d34 100644
> --- a/drivers/tee/optee/device.c
> +++ b/drivers/tee/optee/device.c
> @@ -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-%pUl", device_uuid)) {
Please do not merge. Will send v8.
> + 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;
> }
> --
> 2.17.1
>
OP-TEE based fTPM Trusted Application depends on tee-supplicant to
provide NV RAM implementation based on RPMB secure storage. So this
dependency can be resolved via TEE bus where we only invoke fTPM
driver probe once fTPM device is registered on the bus which is only
true after the tee-supplicant is up and running. Additionally, TEE bus
provides auto device enumeration.
Signed-off-by: Maxim Uvarov <[email protected]>
Suggested-by: Sumit Garg <[email protected]>
Suggested-by: Arnd Bergmann <[email protected]>
Reviewed-by: Sumit Garg <[email protected]>
---
drivers/char/tpm/tpm_ftpm_tee.c | 70 ++++++++++++++++++++++++++++-----
1 file changed, 60 insertions(+), 10 deletions(-)
diff --git a/drivers/char/tpm/tpm_ftpm_tee.c b/drivers/char/tpm/tpm_ftpm_tee.c
index 22bf553ccf9d..28da638360d8 100644
--- a/drivers/char/tpm/tpm_ftpm_tee.c
+++ b/drivers/char/tpm/tpm_ftpm_tee.c
@@ -214,11 +214,10 @@ static int ftpm_tee_match(struct tee_ioctl_version_data *ver, const void *data)
* Return:
* On success, 0. On failure, -errno.
*/
-static int ftpm_tee_probe(struct platform_device *pdev)
+static int ftpm_tee_probe(struct device *dev)
{
int rc;
struct tpm_chip *chip;
- struct device *dev = &pdev->dev;
struct ftpm_tee_private *pvt_data = NULL;
struct tee_ioctl_open_session_arg sess_arg;
@@ -297,6 +296,13 @@ static int ftpm_tee_probe(struct platform_device *pdev)
return rc;
}
+static int ftpm_plat_tee_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+
+ return ftpm_tee_probe(dev);
+}
+
/**
* ftpm_tee_remove() - remove the TPM device
* @pdev: the platform_device description.
@@ -304,9 +310,9 @@ static int ftpm_tee_probe(struct platform_device *pdev)
* Return:
* 0 always.
*/
-static int ftpm_tee_remove(struct platform_device *pdev)
+static int ftpm_tee_remove(struct device *dev)
{
- struct ftpm_tee_private *pvt_data = dev_get_drvdata(&pdev->dev);
+ struct ftpm_tee_private *pvt_data = dev_get_drvdata(dev);
/* Release the chip */
tpm_chip_unregister(pvt_data->chip);
@@ -328,11 +334,18 @@ static int ftpm_tee_remove(struct platform_device *pdev)
return 0;
}
+static int ftpm_plat_tee_remove(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+
+ return ftpm_tee_remove(dev);
+}
+
/**
* ftpm_tee_shutdown() - shutdown the TPM device
* @pdev: the platform_device description.
*/
-static void ftpm_tee_shutdown(struct platform_device *pdev)
+static void ftpm_plat_tee_shutdown(struct platform_device *pdev)
{
struct ftpm_tee_private *pvt_data = dev_get_drvdata(&pdev->dev);
@@ -347,17 +360,54 @@ static const struct of_device_id of_ftpm_tee_ids[] = {
};
MODULE_DEVICE_TABLE(of, of_ftpm_tee_ids);
-static struct platform_driver ftpm_tee_driver = {
+static struct platform_driver ftpm_tee_plat_driver = {
.driver = {
.name = "ftpm-tee",
.of_match_table = of_match_ptr(of_ftpm_tee_ids),
},
- .probe = ftpm_tee_probe,
- .remove = ftpm_tee_remove,
- .shutdown = ftpm_tee_shutdown,
+ .shutdown = ftpm_plat_tee_shutdown,
+ .probe = ftpm_plat_tee_probe,
+ .remove = ftpm_plat_tee_remove,
+};
+
+/* UUID of the fTPM TA */
+static const struct tee_client_device_id optee_ftpm_id_table[] = {
+ {UUID_INIT(0xbc50d971, 0xd4c9, 0x42c4,
+ 0x82, 0xcb, 0x34, 0x3f, 0xb7, 0xf3, 0x78, 0x96)},
+ {}
};
-module_platform_driver(ftpm_tee_driver);
+MODULE_DEVICE_TABLE(tee, optee_ftpm_id_table);
+
+static struct tee_client_driver ftpm_tee_driver = {
+ .id_table = optee_ftpm_id_table,
+ .driver = {
+ .name = "optee-ftpm",
+ .bus = &tee_bus_type,
+ .probe = ftpm_tee_probe,
+ .remove = ftpm_tee_remove,
+ },
+};
+
+static int __init ftpm_mod_init(void)
+{
+ int rc;
+
+ rc = platform_driver_register(&ftpm_tee_plat_driver);
+ if (rc)
+ return rc;
+
+ return driver_register(&ftpm_tee_driver.driver);
+}
+
+static void __exit ftpm_mod_exit(void)
+{
+ platform_driver_unregister(&ftpm_tee_plat_driver);
+ driver_unregister(&ftpm_tee_driver.driver);
+}
+
+module_init(ftpm_mod_init);
+module_exit(ftpm_mod_exit);
MODULE_AUTHOR("Thirupathaiah Annapureddy <[email protected]>");
MODULE_DESCRIPTION("TPM Driver for fTPM TA in TEE");
--
2.17.1