From patchwork Thu Nov 7 10:11:40 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexandre Courbot X-Patchwork-Id: 3152051 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 30F6DBEEB2 for ; Thu, 7 Nov 2013 10:13:32 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id CAF1D2043C for ; Thu, 7 Nov 2013 10:13:30 +0000 (UTC) Received: from casper.infradead.org (casper.infradead.org [85.118.1.10]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 511DC2042B for ; Thu, 7 Nov 2013 10:13:29 +0000 (UTC) Received: from merlin.infradead.org ([2001:4978:20e::2]) by casper.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1VeMa3-0000nB-Lu; Thu, 07 Nov 2013 10:12:51 +0000 Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1VeMZz-0002xb-4j; Thu, 07 Nov 2013 10:12:47 +0000 Received: from hqemgate16.nvidia.com ([216.228.121.65]) by merlin.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1VeMZr-0002uA-Kv for linux-arm-kernel@lists.infradead.org; Thu, 07 Nov 2013 10:12:42 +0000 Received: from hqnvupgp08.nvidia.com (Not Verified[216.228.121.13]) by hqemgate16.nvidia.com id ; Thu, 07 Nov 2013 02:12:35 -0800 Received: from hqemhub02.nvidia.com ([172.20.12.94]) by hqnvupgp08.nvidia.com (PGP Universal service); Thu, 07 Nov 2013 02:06:55 -0800 X-PGP-Universal: processed; by hqnvupgp08.nvidia.com on Thu, 07 Nov 2013 02:06:55 -0800 Received: from percival.nvidia.com (172.20.144.16) by hqemhub02.nvidia.com (172.20.150.31) with Microsoft SMTP Server (TLS) id 8.3.327.1; Thu, 7 Nov 2013 02:12:15 -0800 From: Alexandre Courbot To: Stephen Warren , Russell King , Tomasz Figa Subject: [PATCH v10 1/7] ARM: add basic support for Trusted Foundations Date: Thu, 7 Nov 2013 19:11:40 +0900 Message-ID: <1383819106-1400-2-git-send-email-acourbot@nvidia.com> X-Mailer: git-send-email 1.8.4.2 In-Reply-To: <1383819106-1400-1-git-send-email-acourbot@nvidia.com> References: <1383819106-1400-1-git-send-email-acourbot@nvidia.com> X-NVConfidentiality: public MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20131107_051239_981430_F6647F80 X-CRM114-Status: GOOD ( 24.77 ) X-Spam-Score: -1.9 (-) Cc: Mark Rutland , devicetree@vger.kernel.org, Kevin Hilman , Arnd Bergmann , Pawel Moll , Ian Campbell , linux-kernel@vger.kernel.org, Rob Herring , linux-tegra@vger.kernel.org, Alexandre Courbot , Olof Johansson , Dave Martin , linux-arm-kernel@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Trusted Foundations is a TrustZone-based secure monitor for ARM that can be invoked using the same SMC-based API on all supported platforms. This patch adds initial basic support for Trusted Foundations using the ARM firmware API. Current features are limited to the ability to boot secondary processors. Note: The API followed by Trusted Foundations does *not* follow the SMC calling conventions. It has nothing to do with PSCI neither and is only relevant to devices that use Trusted Foundations (like most Tegra-based retail devices). Signed-off-by: Alexandre Courbot Reviewed-by: Tomasz Figa Reviewed-by: Stephen Warren --- arch/arm/Kconfig | 2 + arch/arm/Makefile | 1 + arch/arm/firmware/Kconfig | 28 +++++++++++ arch/arm/firmware/Makefile | 1 + arch/arm/firmware/trusted_foundations.c | 81 ++++++++++++++++++++++++++++++ arch/arm/include/asm/trusted_foundations.h | 67 ++++++++++++++++++++++++ 6 files changed, 180 insertions(+) create mode 100644 arch/arm/firmware/Kconfig create mode 100644 arch/arm/firmware/Makefile create mode 100644 arch/arm/firmware/trusted_foundations.c create mode 100644 arch/arm/include/asm/trusted_foundations.h diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 1ad6fb6c094d..bf14cec7777c 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -1076,6 +1076,8 @@ config ARM_TIMER_SP804 select CLKSRC_MMIO select CLKSRC_OF if OF +source "arch/arm/firmware/Kconfig" + source arch/arm/mm/Kconfig config ARM_NR_BANKS diff --git a/arch/arm/Makefile b/arch/arm/Makefile index db50b626be98..f9a8e93a9ee2 100644 --- a/arch/arm/Makefile +++ b/arch/arm/Makefile @@ -268,6 +268,7 @@ core-$(CONFIG_KVM_ARM_HOST) += arch/arm/kvm/ core-y += arch/arm/kernel/ arch/arm/mm/ arch/arm/common/ core-y += arch/arm/net/ core-y += arch/arm/crypto/ +core-y += arch/arm/firmware/ core-y += $(machdirs) $(platdirs) drivers-$(CONFIG_OPROFILE) += arch/arm/oprofile/ diff --git a/arch/arm/firmware/Kconfig b/arch/arm/firmware/Kconfig new file mode 100644 index 000000000000..bb00ccf00d66 --- /dev/null +++ b/arch/arm/firmware/Kconfig @@ -0,0 +1,28 @@ +config ARCH_SUPPORTS_FIRMWARE + bool + +config ARCH_SUPPORTS_TRUSTED_FOUNDATIONS + bool + select ARCH_SUPPORTS_FIRMWARE + +menu "Firmware options" + depends on ARCH_SUPPORTS_FIRMWARE + +config TRUSTED_FOUNDATIONS + bool "Trusted Foundations secure monitor support" + depends on ARCH_SUPPORTS_TRUSTED_FOUNDATIONS + help + Some devices (including most Tegra-based consumer devices on the + market) are booted with the Trusted Foundations secure monitor + active, requiring some core operations to be performed by the secure + monitor instead of the kernel. + + This option allows the kernel to invoke the secure monitor whenever + required on devices using Trusted Foundations. See + arch/arm/include/asm/trusted_foundations.h or the + tl,trusted-foundations device tree binding documentation for details + on how to use it. + + Say n if you don't know what this is about. + +endmenu diff --git a/arch/arm/firmware/Makefile b/arch/arm/firmware/Makefile new file mode 100644 index 000000000000..a71f16536b6c --- /dev/null +++ b/arch/arm/firmware/Makefile @@ -0,0 +1 @@ +obj-$(CONFIG_TRUSTED_FOUNDATIONS) += trusted_foundations.o diff --git a/arch/arm/firmware/trusted_foundations.c b/arch/arm/firmware/trusted_foundations.c new file mode 100644 index 000000000000..ef1e3d8f4af0 --- /dev/null +++ b/arch/arm/firmware/trusted_foundations.c @@ -0,0 +1,81 @@ +/* + * Trusted Foundations support for ARM CPUs + * + * Copyright (c) 2013, NVIDIA Corporation. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + */ + +#include +#include +#include +#include +#include + +#define TF_SET_CPU_BOOT_ADDR_SMC 0xfffff200 + +static void __naked tf_generic_smc(u32 type, u32 arg1, u32 arg2) +{ + asm volatile( + ".arch_extension sec\n\t" + "stmfd sp!, {r4 - r11, lr}\n\t" + __asmeq("%0", "r0") + __asmeq("%1", "r1") + __asmeq("%2", "r2") + "mov r3, #0\n\t" + "mov r4, #0\n\t" + "smc #0\n\t" + "ldmfd sp!, {r4 - r11, pc}" + : + : "r" (type), "r" (arg1), "r" (arg2) + : "memory"); +} + +static int tf_set_cpu_boot_addr(int cpu, unsigned long boot_addr) +{ + tf_generic_smc(TF_SET_CPU_BOOT_ADDR_SMC, boot_addr, 0); + + return 0; +} + +static const struct firmware_ops trusted_foundations_ops = { + .set_cpu_boot_addr = tf_set_cpu_boot_addr, +}; + +void register_trusted_foundations(struct trusted_foundations_platform_data *pd) +{ + /* + * we are not using version information for now since currently + * supported SMCs are compatible with all TF releases + */ + register_firmware_ops(&trusted_foundations_ops); +} + +void of_register_trusted_foundations(void) +{ + struct device_node *node; + struct trusted_foundations_platform_data pdata; + int err; + + node = of_find_compatible_node(NULL, NULL, "tlm,trusted-foundations"); + if (!node) + return; + + err = of_property_read_u32(node, "tlm,version-major", + &pdata.version_major); + if (err != 0) + panic("Trusted Foundation: missing version-major property\n"); + err = of_property_read_u32(node, "tlm,version-minor", + &pdata.version_minor); + if (err != 0) + panic("Trusted Foundation: missing version-minor property\n"); + register_trusted_foundations(&pdata); +} diff --git a/arch/arm/include/asm/trusted_foundations.h b/arch/arm/include/asm/trusted_foundations.h new file mode 100644 index 000000000000..3bd36e2c5f2e --- /dev/null +++ b/arch/arm/include/asm/trusted_foundations.h @@ -0,0 +1,67 @@ +/* + * Copyright (c) 2013, NVIDIA Corporation. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + */ + +/* + * Support for the Trusted Foundations secure monitor. + * + * Trusted Foundation comes active on some ARM consumer devices (most + * Tegra-based devices sold on the market are concerned). Such devices can only + * perform some basic operations, like setting the CPU reset vector, through + * SMC calls to the secure monitor. The calls are completely specific to + * Trusted Foundations, and do *not* follow the SMC calling convention or the + * PSCI standard. + */ + +#ifndef __ASM_ARM_TRUSTED_FOUNDATIONS_H +#define __ASM_ARM_TRUSTED_FOUNDATIONS_H + +#include +#include +#include +#include + +struct trusted_foundations_platform_data { + unsigned int version_major; + unsigned int version_minor; +}; + +#if IS_ENABLED(CONFIG_TRUSTED_FOUNDATIONS) + +void register_trusted_foundations(struct trusted_foundations_platform_data *pd); +void of_register_trusted_foundations(void); + +#else /* CONFIG_TRUSTED_FOUNDATIONS */ + +static inline void register_trusted_foundations( + struct trusted_foundations_platform_data *pd) +{ + /* + * If we try to register TF, this means the system needs it to continue. + * Its absence if thus a fatal error. + */ + panic("No support for Trusted Foundations, stopping...\n"); +} + +static inline void of_register_trusted_foundations(void) +{ + /* + * If we find the target should enable TF but does not support it, + * fail as the system won't be able to do much anyway + */ + if (of_find_compatible_node(NULL, NULL, "tl,trusted-foundations")) + register_trusted_foundations(NULL); +} +#endif /* CONFIG_TRUSTED_FOUNDATIONS */ + +#endif