From patchwork Fri Jan 11 11:47:28 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sumit Garg X-Patchwork-Id: 155328 Delivered-To: patch@linaro.org Received: by 2002:a02:48:0:0:0:0:0 with SMTP id 69csp480350jaa; Fri, 11 Jan 2019 03:50:08 -0800 (PST) X-Google-Smtp-Source: ALg8bN7OUtAL7fat6X1f58nmgIoVE5LjRjrSoWXECZlRjnDZ7Ldpiib/XPeg7OaHT094p+cImvT6 X-Received: by 2002:a17:902:8a91:: with SMTP id p17mr14382634plo.316.1547207408339; Fri, 11 Jan 2019 03:50:08 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1547207408; cv=none; d=google.com; s=arc-20160816; b=t+LlpLFRNkPOoEjd4Hc8k5Iqb96v7yJw7vWRtLyk28IaFb+h4G+5n0FNEiauSaAt+l zk0coyIm9Da8jIC+vQDsMiE0rgbVMFwRuvW+aLjx8qqkCYD+r2fvU64zOKP+dIpo5B3J NoZZixluNWXte+AkahRcw/T2jveav5pKqniCShInH0rxUHrrIE2NMqwUp6aalXYe+wed A7swuuFf7WYJY0oyaUQFztNKMdqFflSAo5fQQWd6Lb+cTUQcQvudiMye0by6arrIcOxa FNt80o/KfJqeCPUK1Kdp6dr7dNHRed81CXhvn+dyvBJvvG7lKIHYcTmEOunu+NnI3i5Y Vtaw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:references:in-reply-to:message-id:date :subject:cc:to:from:dkim-signature; bh=6abORcUabUlyQ/4AP1uyvPR1q2RgpmyN10/gdUhWenU=; b=JLA0/U38rkACfPVWueH/WvqeKmOvc2n85PEAoSovlcqQLvxFy4UW2ybzzqhFnwtXG1 +BbzgbURI/n0DX1wbT5o03gaUhFeUK6Q2sz5f7KKixNkl64yVMPt1CeaqMt75bM3i0ty zmtlgvqu63QZYBvfs/hjePFE95AFfwK37Gnvs2PkKZsF71D2O1ZVjkhsK8mrgE/9isW1 etZwYNrwQRRfrpueLv8tqnDK+mhzSrV5tuLEW1a49ld1HrA2fqhwYbmWhX/wCPYbhuRJ RM3ar7KhdN2ou/mPjhpvGI2/XktWiD3ShqyOOwDWr8md0l06wCcOmsgMiCUQvBTcx9Mu Zevw== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b="g7gHW/jW"; spf=pass (google.com: best guess record for domain of linux-crypto-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-crypto-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id a185si8734180pge.404.2019.01.11.03.50.08; Fri, 11 Jan 2019 03:50:08 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-crypto-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b="g7gHW/jW"; spf=pass (google.com: best guess record for domain of linux-crypto-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-crypto-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731703AbfAKLuG (ORCPT + 3 others); Fri, 11 Jan 2019 06:50:06 -0500 Received: from mail-pg1-f196.google.com ([209.85.215.196]:35021 "EHLO mail-pg1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731702AbfAKLuG (ORCPT ); Fri, 11 Jan 2019 06:50:06 -0500 Received: by mail-pg1-f196.google.com with SMTP id s198so6243714pgs.2 for ; Fri, 11 Jan 2019 03:50:05 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=6abORcUabUlyQ/4AP1uyvPR1q2RgpmyN10/gdUhWenU=; b=g7gHW/jWIMatBO2ENQA5SeXRuUX/6+SBSitd2LC02rG48Qav0QUTKMPvKqhqp+PIPo B17vysB8REO2mwgTVcJS2rLsQUkjzmafkzovfO4ZR04o7Xu8yIs58dZIcLV1fQ9oIFHf KRaGg5tEbFErZjiuevko6B4g1rStpuLJoimOM= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=6abORcUabUlyQ/4AP1uyvPR1q2RgpmyN10/gdUhWenU=; b=jkOjcS8hs2zbFSsiQIDIFCQ1jbZOPU6cxcHYS6dfMZsouu8TYl/LCOFllv4PTK4dTO Wo+2rBYPHIes75CA6PTVC2fGijkOeWO4i53fwt5ZeMac1u1nuzw3qlBCkaOwO89YCFsu Xtls6ADrmm6/4+BBQRb5SXyDBEOatWXib1trapb8hzUbr/bsi/xpKS4yYn8uc101C2PO 3oxdReP1V6/K+bkZwI85fRUOeAWsY380/+PKsr2jxE0EH218HW8U1YTklk2resTzXaoB Xpv2wVav6QJrAVL7WwWb1YmViYXw1KEfdW/UXs96X2ObzE3CLgCxWh0LwQ5vjPXD39q1 diFw== X-Gm-Message-State: AJcUuke0r5XjoM/Y4/+/1B5XIGoBWAFzuxqqUwOdWxuWkwC4buyNHBpz LmWHD4zYHf43v08CIT9a0f33Eg== X-Received: by 2002:a62:8e19:: with SMTP id k25mr14208417pfe.185.1547207405038; Fri, 11 Jan 2019 03:50:05 -0800 (PST) Received: from localhost.localdomain ([117.196.233.251]) by smtp.gmail.com with ESMTPSA id b2sm143199988pfm.3.2019.01.11.03.49.59 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Fri, 11 Jan 2019 03:50:04 -0800 (PST) From: Sumit Garg To: linux-arm-kernel@lists.infradead.org, linux-crypto@vger.kernel.org Cc: linux-kernel@vger.kernel.org, jens.wiklander@linaro.org, mpm@selenic.com, herbert@gondor.apana.org.au, robh+dt@kernel.org, mark.rutland@arm.com, arnd@arndb.de, gregkh@linuxfoundation.org, daniel.thompson@linaro.org, ard.biesheuvel@linaro.org, bhsharma@redhat.com, tee-dev@lists.linaro.org, Sumit Garg Subject: [PATCH v3 1/4] tee: add bus driver framework for TEE based devices Date: Fri, 11 Jan 2019 17:17:28 +0530 Message-Id: <1547207251-9372-2-git-send-email-sumit.garg@linaro.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1547207251-9372-1-git-send-email-sumit.garg@linaro.org> References: <1547207251-9372-1-git-send-email-sumit.garg@linaro.org> Sender: linux-crypto-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org Introduce a generic TEE bus driver concept for TEE based kernel drivers which would like to communicate with TEE based devices/services. In this TEE bus concept, devices/services are identified via Universally Unique Identifier (UUID) and drivers register a table of device UUIDs which they can support. So this TEE bus framework registers a match() callback function which iterates over the driver UUID table to find a corresponding match for device UUID. If a match is found, then this particular device is probed via corresponding probe api registered by the driver. This process happens whenever a device or a driver is registered with TEE bus. Also this framework allows for device enumeration to be specific to corresponding TEE implementation like OP-TEE etc. Signed-off-by: Sumit Garg --- drivers/tee/tee_core.c | 43 ++++++++++++++++++++++++++++++++++++++++--- include/linux/tee_drv.h | 36 ++++++++++++++++++++++++++++++++++++ 2 files changed, 76 insertions(+), 3 deletions(-) -- 2.7.4 diff --git a/drivers/tee/tee_core.c b/drivers/tee/tee_core.c index 7b2bb4c..a685940 100644 --- a/drivers/tee/tee_core.c +++ b/drivers/tee/tee_core.c @@ -15,7 +15,6 @@ #define pr_fmt(fmt) "%s: " fmt, __func__ #include -#include #include #include #include @@ -1027,6 +1026,30 @@ int tee_client_invoke_func(struct tee_context *ctx, } EXPORT_SYMBOL_GPL(tee_client_invoke_func); +static int tee_client_device_match(struct device *dev, + struct device_driver *drv) +{ + struct tee_client_device *tee_device; + const struct tee_client_device_id *id_table; + + tee_device = to_tee_client_device(dev); + id_table = to_tee_client_driver(drv)->id_table; + + while (!uuid_is_null(&id_table->uuid)) { + if (uuid_equal(&tee_device->id.uuid, &id_table->uuid)) + return 1; + id_table++; + } + + return 0; +} + +struct bus_type tee_bus_type = { + .name = "tee", + .match = tee_client_device_match, +}; +EXPORT_SYMBOL_GPL(tee_bus_type); + static int __init tee_init(void) { int rc; @@ -1040,10 +1063,23 @@ static int __init tee_init(void) rc = alloc_chrdev_region(&tee_devt, 0, TEE_NUM_DEVICES, "tee"); if (rc) { pr_err("failed to allocate char dev region\n"); - class_destroy(tee_class); - tee_class = NULL; + goto chrdev_err; } + rc = bus_register(&tee_bus_type); + if (rc) { + pr_err("failed to register tee bus\n"); + goto bus_err; + } + + return 0; + +bus_err: + unregister_chrdev_region(tee_devt, TEE_NUM_DEVICES); +chrdev_err: + class_destroy(tee_class); + tee_class = NULL; + return rc; } @@ -1052,6 +1088,7 @@ static void __exit tee_exit(void) class_destroy(tee_class); tee_class = NULL; unregister_chrdev_region(tee_devt, TEE_NUM_DEVICES); + bus_unregister(&tee_bus_type); } subsys_initcall(tee_init); diff --git a/include/linux/tee_drv.h b/include/linux/tee_drv.h index 6cfe058..ed16bf1 100644 --- a/include/linux/tee_drv.h +++ b/include/linux/tee_drv.h @@ -20,6 +20,8 @@ #include #include #include +#include +#include /* * The file describes the API provided by the generic TEE driver to the @@ -538,4 +540,38 @@ static inline bool tee_param_is_memref(struct tee_param *param) } } +extern struct bus_type tee_bus_type; + +/** + * struct tee_client_device_id - tee based device identifier + * @uuid: For TEE based client devices we use the device uuid + * as the identifier. + */ +struct tee_client_device_id { + uuid_t uuid; +}; + +/** + * struct tee_client_device - tee based device + * @id: device identifier + * @dev: device structure + */ +struct tee_client_device { + struct tee_client_device_id id; + struct device dev; +}; +#define to_tee_client_device(d) container_of(d, struct tee_client_device, dev) + +/** + * struct tee_client_driver - tee client driver + * @id_table: device id table supported by this driver + * @driver: driver structure + */ +struct tee_client_driver { + const struct tee_client_device_id *id_table; + struct device_driver driver; +}; +#define to_tee_client_driver(d) \ + container_of(d, struct tee_client_driver, driver) + #endif /*__TEE_DRV_H*/ From patchwork Fri Jan 11 11:47:30 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sumit Garg X-Patchwork-Id: 155330 Delivered-To: patch@linaro.org Received: by 2002:a02:48:0:0:0:0:0 with SMTP id 69csp480629jaa; 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So implement device enumeration using invoke function: PTA_CMD_GET_DEVICES provided by pseudo TA to fetch array of device UUIDs. Also register these enumerated devices with TEE bus as "optee-clntX" device. Signed-off-by: Sumit Garg --- drivers/tee/optee/Makefile | 1 + drivers/tee/optee/core.c | 4 + drivers/tee/optee/device.c | 153 ++++++++++++++++++++++++++++++++++++++ drivers/tee/optee/optee_private.h | 3 + 4 files changed, 161 insertions(+) create mode 100644 drivers/tee/optee/device.c -- 2.7.4 diff --git a/drivers/tee/optee/Makefile b/drivers/tee/optee/Makefile index 48d262a..56263ae 100644 --- a/drivers/tee/optee/Makefile +++ b/drivers/tee/optee/Makefile @@ -5,3 +5,4 @@ optee-objs += call.o optee-objs += rpc.o optee-objs += supp.o optee-objs += shm_pool.o +optee-objs += device.o diff --git a/drivers/tee/optee/core.c b/drivers/tee/optee/core.c index e5efce3..ac59c77 100644 --- a/drivers/tee/optee/core.c +++ b/drivers/tee/optee/core.c @@ -634,6 +634,10 @@ static struct optee *optee_probe(struct device_node *np) if (optee->sec_caps & OPTEE_SMC_SEC_CAP_DYNAMIC_SHM) pr_info("dynamic shared memory is enabled\n"); + rc = optee_enumerate_devices(); + if (rc) + goto err; + pr_info("initialized driver\n"); return optee; err: diff --git a/drivers/tee/optee/device.c b/drivers/tee/optee/device.c new file mode 100644 index 0000000..987e552 --- /dev/null +++ b/drivers/tee/optee/device.c @@ -0,0 +1,153 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2019 Linaro Ltd. + */ + +#include +#include +#include +#include +#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) + return 1; + else + return 0; +} + +static int get_devices(struct tee_context *ctx, u32 session, + struct tee_shm *device_shm, u32 *shm_size) +{ + u32 ret = 0; + struct tee_ioctl_invoke_arg inv_arg = {0}; + struct tee_param param[4] = {0}; + + /* Invoke PTA_CMD_GET_DEVICES function */ + inv_arg.func = PTA_CMD_GET_DEVICES; + inv_arg.session = session; + inv_arg.num_params = 4; + + /* Fill invoke cmd params */ + param[0].attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT; + param[0].u.memref.shm = device_shm; + param[0].u.memref.size = *shm_size; + param[0].u.memref.shm_offs = 0; + + ret = tee_client_invoke_func(ctx, &inv_arg, param); + if ((ret < 0) || ((inv_arg.ret != TEEC_SUCCESS) && + (inv_arg.ret != TEEC_ERROR_SHORT_BUFFER))) { + pr_err("PTA_CMD_GET_DEVICES invoke function err: %x\n", + inv_arg.ret); + return -EINVAL; + } + + *shm_size = param[0].u.memref.size; + + return 0; +} + +static int optee_register_device(const uuid_t *device_uuid, u32 device_id) +{ + struct tee_client_device *optee_device = NULL; + int rc; + + optee_device = kzalloc(sizeof(*optee_device), GFP_KERNEL); + if (!optee_device) + return -ENOMEM; + + optee_device->dev.bus = &tee_bus_type; + dev_set_name(&optee_device->dev, "optee-clnt%u", device_id); + uuid_copy(&optee_device->id.uuid, device_uuid); + + rc = device_register(&optee_device->dev); + if (rc) { + pr_err("device registration failed, err: %d\n", rc); + kfree(optee_device); + } + + return rc; +} + +int optee_enumerate_devices(void) +{ + const uuid_t pta_uuid = + UUID_INIT(0x7011a688, 0xddde, 0x4053, + 0xa5, 0xa9, 0x7b, 0x3c, 0x4d, 0xdf, 0x13, 0xb8); + struct tee_ioctl_open_session_arg sess_arg = {0}; + struct tee_shm *device_shm = NULL; + const uuid_t *device_uuid = NULL; + struct tee_context *ctx = NULL; + u32 shm_size = 0, idx, num_devices = 0; + int rc; + + /* Open context with OP-TEE driver */ + ctx = tee_client_open_context(NULL, optee_ctx_match, NULL, NULL); + if (IS_ERR(ctx)) + return -ENODEV; + + /* Open session with device enumeration pseudo TA */ + memcpy(sess_arg.uuid, pta_uuid.b, TEE_IOCTL_UUID_LEN); + sess_arg.clnt_login = TEE_IOCTL_LOGIN_PUBLIC; + sess_arg.num_params = 0; + + rc = tee_client_open_session(ctx, &sess_arg, NULL); + if ((rc < 0) || (sess_arg.ret != TEEC_SUCCESS)) { + /* Device enumeration pseudo TA not found */ + rc = 0; + goto out_ctx; + } + + rc = get_devices(ctx, sess_arg.session, NULL, &shm_size); + if (rc < 0) + goto out_sess; + + device_shm = tee_shm_alloc(ctx, shm_size, + TEE_SHM_MAPPED | TEE_SHM_DMA_BUF); + if (IS_ERR(device_shm)) { + pr_err("tee_shm_alloc failed\n"); + rc = PTR_ERR(device_shm); + goto out_sess; + } + + rc = get_devices(ctx, sess_arg.session, device_shm, &shm_size); + if (rc < 0) + goto out_shm; + + device_uuid = tee_shm_get_va(device_shm, 0); + if (IS_ERR(device_uuid)) { + pr_err("tee_shm_get_va failed\n"); + rc = PTR_ERR(device_uuid); + goto out_shm; + } + + num_devices = shm_size / sizeof(uuid_t); + + for (idx = 0; idx < num_devices; idx++) { + rc = optee_register_device(&device_uuid[idx], idx); + if (rc) + goto out_shm; + } + +out_shm: + tee_shm_free(device_shm); +out_sess: + tee_client_close_session(ctx, sess_arg.session); +out_ctx: + tee_client_close_context(ctx); + + return rc; +} diff --git a/drivers/tee/optee/optee_private.h b/drivers/tee/optee/optee_private.h index 35e7938..a5e84af 100644 --- a/drivers/tee/optee/optee_private.h +++ b/drivers/tee/optee/optee_private.h @@ -28,6 +28,7 @@ #define TEEC_ERROR_BAD_PARAMETERS 0xFFFF0006 #define TEEC_ERROR_COMMUNICATION 0xFFFF000E #define TEEC_ERROR_OUT_OF_MEMORY 0xFFFF000C +#define TEEC_ERROR_SHORT_BUFFER 0xFFFF0010 #define TEEC_ORIGIN_COMMS 0x00000002 @@ -181,6 +182,8 @@ 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); + /* * Small helpers */