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Enable multi-stage OP-TEE bus enumeration

Browse Source 
Probes drivers on the OP-TEE bus in two steps. First for drivers which
 do not depend on tee-supplicant. After tee-supplicant has been started
 probe the devices which do depend on tee-supplicant.
 
 Also introduces driver which uses an OP-TEE based fTPM Trusted
 Application depends on tee-supplicant NV RAM implementation based on
 RPMB secure storage.
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Merge tag 'optee-bus-for-v5.9' of git://git.linaro.org/people/jens.wiklander/linux-tee into arm/drivers

Enable multi-stage OP-TEE bus enumeration

Probes drivers on the OP-TEE bus in two steps. First for drivers which
do not depend on tee-supplicant. After tee-supplicant has been started
probe the devices which do depend on tee-supplicant.

Also introduces driver which uses an OP-TEE based fTPM Trusted
Application depends on tee-supplicant NV RAM implementation based on
RPMB secure storage.

* tag 'optee-bus-for-v5.9' of git://git.linaro.org/people/jens.wiklander/linux-tee:
  tpm_ftpm_tee: register driver on TEE bus
  optee: enable support for multi-stage bus enumeration
  optee: use uuid for sysfs driver entry

Link: https://lore.kernel.org/r/20200710085230.GA1312913@jade
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Arnd Bergmann 2020-07-13 15:11:42 +02:00
commit 38d9dff186
6 changed files with 119 additions and 35 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
Documentation/ABI/testing/sysfs-bus-optee-devices Normal file
View File

@ -0,0 +1,8 @@
What: /sys/bus/tee/devices/optee-ta-<uuid>/
Date: May 2020
KernelVersion 5.8
Contact: op-tee@lists.trustedfirmware.org
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.

1
MAINTAINERS
View File

@ -12697,6 +12697,7 @@ OP-TEE DRIVER
M: Jens Wiklander <jens.wiklander@linaro.org>
L: tee-dev@lists.linaro.org
S: Maintained
F: Documentation/ABI/testing/sysfs-bus-optee-devices
F: drivers/tee/optee/
OP-TEE RANDOM NUMBER GENERATOR (RNG) DRIVER

70
drivers/char/tpm/tpm_ftpm_tee.c
View File

@ -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 @@ out_tee_session:
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 @@ out_tee_session:
* 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,
};
module_platform_driver(ftpm_tee_driver);
/* 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_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");

27
drivers/tee/optee/core.c
View File

@ -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);
@ -296,9 +312,14 @@ 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 = {
.get_version = optee_get_version,
@ -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;

38
drivers/tee/optee/device.c
View File

@ -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(&param, 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;
@ -65,7 +53,7 @@ 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 +63,10 @@ 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-%pUb", device_uuid)) {
kfree(optee_device);
return -ENOMEM;
}
uuid_copy(&optee_device->id.uuid, device_uuid);
rc = device_register(&optee_device->dev);
@ -87,7 +78,7 @@ static int optee_register_device(const uuid_t *device_uuid, u32 device_id)
return rc;
}
int optee_enumerate_devices(void)
static int __optee_enumerate_devices(u32 func)
{
const uuid_t pta_uuid =
UUID_INIT(0x7011a688, 0xddde, 0x4053,
@ -118,7 +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;
@ -130,7 +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;
@ -144,7 +135,7 @@ 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;
}
@ -158,3 +149,8 @@ out_ctx:
return rc;
}
int optee_enumerate_devices(u32 func)
{
return __optee_enumerate_devices(func);
}

10
drivers/tee/optee/optee_private.h
View File

@ -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