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[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*/