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Such always-available services can be readily accessed by TEE client drivers via QTEE's object-IPC protocol if the service is registered as a device on the TEE bus. One such service is the EFI-variables service, implemented by the uefisecapp TA which enables kernel clients to access EFI variables at runtime. Maintain a static list of such always-available secure services and add support for the QCOMTEE driver to register these services as devices on the TEE bus during probe. Signed-off-by: Harshal Dev --- drivers/tee/qcomtee/call.c | 160 ++++++++++++++++++++++++++++++++++- drivers/tee/qcomtee/core.c | 9 +- drivers/tee/qcomtee/qcomtee.h | 10 +++ drivers/tee/qcomtee/qcomtee_msg.h | 1 + drivers/tee/qcomtee/qcomtee_object.h | 3 +- 5 files changed, 176 insertions(+), 7 deletions(-) diff --git a/drivers/tee/qcomtee/call.c b/drivers/tee/qcomtee/call.c index c97afaa1b4aa..47d8a4f9a159 100644 --- a/drivers/tee/qcomtee/call.c +++ b/drivers/tee/qcomtee/call.c @@ -676,9 +676,13 @@ static void qcomtee_get_qtee_feature_list(struct tee_context *ctx, u32 id, /* Get ''FeatureVersions Service'' object. */ service = qcomtee_object_get_service(oic, client_env, - QCOMTEE_FEATURE_VER_UID); - if (service == NULL_QCOMTEE_OBJECT) + QCOMTEE_FEATURE_VER_UID, + &result); + if (service == NULL_QCOMTEE_OBJECT) { + if (result) + pr_err("FeatureVersions Service unavailable (%d)\n", result); goto out_failed; + } /* IB: Feature to query. */ u[0].b.addr = &id; @@ -698,6 +702,155 @@ static void qcomtee_get_qtee_feature_list(struct tee_context *ctx, u32 id, qcomtee_object_put(client_env); } +/** + * is_qcomtee_service_available() - Check if the QTEE service identified by the UID + * is available. + * @oic: context to use for the current invocation. + * @client_env: Client environment object. + * @service_name: Name of the QTEE service. + * @uid: 32-bit UID of the service. + * + * Returns true if the service exists and is available. + * Returns false if a service is not exposed by QTEE. + */ +static bool is_qcomtee_service_available(struct qcomtee_object_invoke_ctx *oic, + struct qcomtee_object *client_env, + const char *service_name, u32 uid) +{ + struct qcomtee_object *service; + int error = 0; + bool ret = false; + + /* Get service object corresponding to the uid. */ + service = qcomtee_object_get_service(oic, client_env, uid, &error); + if (service != NULL_QCOMTEE_OBJECT) { + qcomtee_object_put(service); + ret = true; + } + + /* When we fail to get the service, QTEE provides the reason. */ + if (error) + pr_debug("%s is unavailable (%d)\n", service_name, error); + + return ret; +} + +/* + * QTEE Service UUID name space identifier + * + * A random UUID that is allocated as a name space identifier for forming UUID's + * representing secure services exposed by QTEE. + */ +static const uuid_t qtee_service_uuid_ns = UUID_INIT(0xe1b48857, 0x6154, 0x49f9, + 0x93, 0x4e, 0xa2, 0xf2, + 0x0a, 0xba, 0x98, 0x42); + +static const struct qtee_service qtee_services[] = { + { "qcom.tz.uefisecapp", + QCOMTEE_UEFI_SEC_UID } +}; + +static void qtee_release_service(struct device *dev) +{ + struct tee_client_device *qtee_service = to_tee_client_device(dev); + + kfree(qtee_service); +} + +/** + * qtee_register_service() - Register a given QTEE service on the TEE bus as a + * TEE client device. + * @oic: context to use for the current invocation. + * @client_env: Client environment object. + * @service_name: Name of the QTEE service to be enumerated. + * @uid: 32-bit UID used by QTEE to identify the service. + * + * Returns 0 on success and < 0 on failure. + */ +static int qtee_register_service(struct qcomtee_object_invoke_ctx *oic, + struct qcomtee_object *client_env, + const char *service_name, + const u32 uid) +{ + struct tee_client_device *qtee_service; + uuid_t service_uuid; + int rc; + + if (!is_qcomtee_service_available(oic, client_env, service_name, uid)) + return -EOPNOTSUPP; + + tee_generate_uuid_v5(&service_uuid, &qtee_service_uuid_ns, service_name, + strlen(service_name)); + + qtee_service = kzalloc_obj(*qtee_service); + if (!qtee_service) + return -ENOMEM; + + qtee_service->dev.bus = &tee_bus_type; + qtee_service->dev.release = qtee_release_service; + if (dev_set_name(&qtee_service->dev, "qtee-svc-%pUb", &service_uuid)) { + kfree(qtee_service); + return -ENOMEM; + } + uuid_copy(&qtee_service->id.uuid, &service_uuid); + + rc = device_register(&qtee_service->dev); + if (rc) { + pr_err("QTEE service registration failed, err: %d\n", rc); + put_device(&qtee_service->dev); + return rc; + } + + return 0; +} + +/** + * qtee_register_services() - Register the secure services exposed by QTEE + * as mentioned in 'qtee_services' list. + * @ctx: TEE context. + * + * Not all versions of QTEE support a given service. Hence, we try to + * enumerate as many services from the 'qtee_services' list as possible. + * Not being able to enumerate a service shouldn't cause the driver probe + * to fail since none of the services in the list are mandatory for + * establishing communication with QTEE. + */ +static void qtee_register_services(struct tee_context *ctx) +{ + u32 idx; + struct qcomtee_object *client_env; + + struct qcomtee_object_invoke_ctx *oic __free(kfree) = + qcomtee_object_invoke_ctx_alloc(ctx, true); + if (!oic) + return; + + client_env = qcomtee_object_get_client_env(oic); + if (client_env == NULL_QCOMTEE_OBJECT) + return; + + for (idx = 0; idx < ARRAY_SIZE(qtee_services); idx++) + qtee_register_service(oic, client_env, + qtee_services[idx].name, + qtee_services[idx].uid); + + qcomtee_object_put(client_env); +} + +static int qtee_unregister_service(struct device *dev, void *data) +{ + if (!strncmp(dev_name(dev), "qtee-svc", strlen("qtee-svc"))) + device_unregister(dev); + + return 0; +} + +static void qtee_unregister_services(void) +{ + bus_for_each_dev(&tee_bus_type, NULL, NULL, + qtee_unregister_service); +} + static const struct tee_driver_ops qcomtee_ops = { .get_version = qcomtee_get_version, .open = qcomtee_open, @@ -779,6 +932,8 @@ static int qcomtee_probe(struct platform_device *pdev) QTEE_VERSION_GET_MINOR(qcomtee->qtee_version), QTEE_VERSION_GET_PATCH(qcomtee->qtee_version)); + qtee_register_services(qcomtee->ctx); + return 0; err_dest_wq: @@ -808,6 +963,7 @@ static void qcomtee_remove(struct platform_device *pdev) { struct qcomtee *qcomtee = platform_get_drvdata(pdev); + qtee_unregister_services(); teedev_close_context(qcomtee->ctx); /* Wait for RELEASE operations to be processed for QTEE objects. */ tee_device_unregister(qcomtee->teedev); diff --git a/drivers/tee/qcomtee/core.c b/drivers/tee/qcomtee/core.c index 60fe3b5776e3..4a523a95bf0e 100644 --- a/drivers/tee/qcomtee/core.c +++ b/drivers/tee/qcomtee/core.c @@ -898,19 +898,20 @@ qcomtee_object_get_client_env(struct qcomtee_object_invoke_ctx *oic) struct qcomtee_object * qcomtee_object_get_service(struct qcomtee_object_invoke_ctx *oic, - struct qcomtee_object *client_env, u32 uid) + struct qcomtee_object *client_env, u32 uid, + int *result) { struct qcomtee_arg u[3] = { 0 }; - int ret, result; + int ret; u[0].b.addr = &uid; u[0].b.size = sizeof(uid); u[0].type = QCOMTEE_ARG_TYPE_IB; u[1].type = QCOMTEE_ARG_TYPE_OO; ret = qcomtee_object_do_invoke(oic, client_env, QCOMTEE_CLIENT_ENV_OPEN, - u, &result); + u, result); - if (ret || result) + if (ret || *result) return NULL_QCOMTEE_OBJECT; return u[1].o; diff --git a/drivers/tee/qcomtee/qcomtee.h b/drivers/tee/qcomtee/qcomtee.h index f39bf63fd1c2..b1fe1d317150 100644 --- a/drivers/tee/qcomtee/qcomtee.h +++ b/drivers/tee/qcomtee/qcomtee.h @@ -39,6 +39,16 @@ struct qcomtee { u32 qtee_version; }; +/** + * struct qtee_service - A secure service exposed by QTEE identified by a 32-bit UID. + * @name: Name of the QTEE service. + * @uid: 32-bit UID used by QTEE to identify the service. + */ +struct qtee_service { + const char *name; + const u32 uid; +}; + void qcomtee_fetch_async_reqs(struct qcomtee_object_invoke_ctx *oic); struct qcomtee_object *qcomtee_idx_erase(struct qcomtee_object_invoke_ctx *oic, u32 idx); diff --git a/drivers/tee/qcomtee/qcomtee_msg.h b/drivers/tee/qcomtee/qcomtee_msg.h index 5d7b21fdd368..9278a361dc70 100644 --- a/drivers/tee/qcomtee/qcomtee_msg.h +++ b/drivers/tee/qcomtee/qcomtee_msg.h @@ -105,6 +105,7 @@ union qcomtee_msg_arg { #define QTEE_VERSION_GET_MINOR(x) (((x) >> 12) & 0xffU) #define QTEE_VERSION_GET_PATCH(x) ((x) >> 0 & 0xfffU) +#define QCOMTEE_UEFI_SEC_UID 413 /* Response types as returned from qcomtee_object_invoke_ctx_invoke(). */ /* The message contains a callback request. */ diff --git a/drivers/tee/qcomtee/qcomtee_object.h b/drivers/tee/qcomtee/qcomtee_object.h index a241ab657318..e2f2508aad8f 100644 --- a/drivers/tee/qcomtee/qcomtee_object.h +++ b/drivers/tee/qcomtee/qcomtee_object.h @@ -317,6 +317,7 @@ qcomtee_object_get_client_env(struct qcomtee_object_invoke_ctx *oic); struct qcomtee_object * qcomtee_object_get_service(struct qcomtee_object_invoke_ctx *oic, - struct qcomtee_object *client_env, u32 uid); + struct qcomtee_object *client_env, u32 uid, + int *result); #endif /* QCOMTEE_OBJECT_H */ -- 2.34.1