Re: [Tee-dev] [PATCHv2 2/2] tpm_ftpm_tee: register driver on TEE bus

On Thu, May 21, 2020 at 09:47:43AM +0300, Maxim Uvarov wrote:

Register driver on TEE bus. module tee registers bus,

"on the TEE bus"

"The module tee"

and module optee calls optee_enumerate_devices() to scan all devices on the bus. Trusted Application for this driver

Looking at drivers/tee, it shows that tee and optee are in fact the same module as opposed to what your commit message says.

can be Early TA's (can be compiled into optee-os). In that case it will be on OPTEE bus before linux booting. Also optee-suplicant application is needed to be loaded between OPTEE module and ftpm module to maintain functionality for fTPM driver.

Why is this needed and why things worked before having this?

Signed-off-by: Maxim Uvarov maxim.uvarov@linaro.org Suggested-by: Sumit Garg sumit.garg@linaro.org Suggested-by: Arnd Bergmann arnd@linaro.org

---

drivers/char/tpm/tpm_ftpm_tee.c | 69 ++++++++++++++++++++++++++++----- 1 file changed, 59 insertions(+), 10 deletions(-)

diff --git a/drivers/char/tpm/tpm_ftpm_tee.c b/drivers/char/tpm/tpm_ftpm_tee.c index 22bf553ccf9d..7bb4ce281050 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 +360,53 @@ 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,

+};

+static const struct tee_client_device_id optee_ftpm_id_table[] = {

• {UUID_INIT(0xbc50d971, 0xd4c9, 0x42c4,

•    0x82, 0xcb, 0x34, 0x3f, 0xb7, 0xf3, 0x78, 0x96)},
  

• {}

Please put a comment describing what this is.

}; -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 thiruan@microsoft.com"); MODULE_DESCRIPTION("TPM Driver for fTPM TA in TEE"); -- 2.17.1

Wondering if MODULE_AUTHOR() is still equired given that the GIT log has objectively better log of authorship.

/Jarkko