From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 552EF445AF6; Fri, 4 Sep 2026 09:50:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788515453; cv=none; b=IaF60mZd5MWdhZ0pRi5/2SJksgTWlvyVIiX4rHKTWLAHQo4Eu6fWnudDnOX303V9ZZJLEN5KhrM1FpQoT4klBrl+o+9iiXRr45dCyL+Ycda870TmGkiyyYSItLqNpLy1hhbpRC4TAbzg89zEVopvm/GKHWAWWLTH/7aIWQ17PZ0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788515453; c=relaxed/simple; bh=UV9FtKrMH34UAuPaYnCx8rL0URAlIwAGundqKzuizaQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=t2ZX1a7lSoWF/4gvi6+IbgilDWnM/1Eqo/kAeP9PTT7kC85E2O3+0aRP6eVtM14+FQjiKyQbtHVJ5zjiEeU1Kbek2+4jsP5tUdtkrthUvWV56XPgpJEnfhiPwytjNBtbnn8tMbkUrQq1xyly7whlFnHDWNU/eE0XoeTWDquhA38= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=nMw6/jHX; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="nMw6/jHX" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 230AD1F00AC4; Fri, 4 Sep 2026 09:50:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1788515452; bh=j91SZM4aDJbM7C+/1XdkYfA2OhaMRcOpXiX/V1LncyI=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=nMw6/jHXRLZ300Uy05j+VFnsZEPFTUbUIymI3B/rcbFteIidW8+wDeKMilXWp71Fl 9PfpMC2422mnjU9O0eG1DUmfwlWAw/05X8XZAKRlp9kCfrAn+GSEHSVUJxJaphuXZ+ CcPyiziVmHtNj0As95pf6tZRjQVwSHMh/4Is+NXinP+bKq2/dLqfmrWBXi2GNTUIrr 68OhYvYSjZKzuwzGnq0yKZm4x2Ze9pItM1v8U2wJWaWi84DRF66lLWq+oCQceS7lHy 3CP7DbaYkbjoFGZv7KBNVogxO1+8T28avD0bmhy4Aus/OgmlUca8HrI9V5O+SpLYDe pWT3lwglXQIuA== From: "Aneesh Kumar K.V (Arm)" To: linux-coco@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Cc: "Aneesh Kumar K.V (Arm)" , Catalin Marinas , Greg KH , Jeremy Linton , Jonathan Cameron , Lorenzo Pieralisi , Mark Rutland , Sudeep Holla , Will Deacon , Steven Price , Suzuki K Poulose , Andre Przywara Subject: [PATCH v10 6/7] firmware: smccc: arm-cca-guest: Bind the TSM provider to an SMCCC device Date: Fri, 4 Sep 2026 15:19:59 +0530 Message-ID: <20260904095000.1184861-7-aneesh.kumar@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260904095000.1184861-1-aneesh.kumar@kernel.org> References: <20260904095000.1184861-1-aneesh.kumar@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The Arm CCA guest TSM provider currently binds through the arm-cca-dev platform device. Like arm-smccc-trng, this device is not an independent platform resource; it is a software representation of the RSI firmware service discovered through SMCCC. Move RSI discovery into the SMCCC firmware driver. When the SMCCC conduit is SMC and if RSI ABI version call is supported, create an arm-rsi-dev SMCCC device. Convert the Arm CCA guest TSM provider to an SMCCC driver so it binds to that discovered RSI service and keeps module autoloading through the SMCCC device id table. Keep the old arm-cca-dev platform-device registration for now. Userspace has used that device as a Realm-guest indicator, so removing it is left to a follow-up patch that adds a replacement sysfs ABI. Signed-off-by: Aneesh Kumar K.V (Arm) --- drivers/firmware/arm_rmm/rsi.c | 2 +- drivers/firmware/smccc/smccc.c | 6 ++++ drivers/virt/coco/arm-cca-guest/Kconfig | 1 + drivers/virt/coco/arm-cca-guest/main.c | 44 +++++++++++-------------- include/linux/arm-rsi-cmds.h | 1 - 5 files changed, 27 insertions(+), 27 deletions(-) diff --git a/drivers/firmware/arm_rmm/rsi.c b/drivers/firmware/arm_rmm/rsi.c index ada139d0e344..2dd69febedbd 100644 --- a/drivers/firmware/arm_rmm/rsi.c +++ b/drivers/firmware/arm_rmm/rsi.c @@ -183,7 +183,7 @@ void __init arm64_rsi_init(void) } static struct platform_device rsi_dev = { - .name = RSI_PDEV_NAME, + .name = "arm-cca-dev", .id = PLATFORM_DEVID_NONE }; diff --git a/drivers/firmware/smccc/smccc.c b/drivers/firmware/smccc/smccc.c index 5ea3478be9d3..854276a3cd57 100644 --- a/drivers/firmware/smccc/smccc.c +++ b/drivers/firmware/smccc/smccc.c @@ -10,6 +10,7 @@ #include #include #include +#include #include @@ -94,6 +95,11 @@ static const struct smccc_device_info smccc_devices[] __initconst = { .requires_smc = false, .device_name = "arm-smccc-trng", }, + { + .func_id = SMC_RSI_ABI_VERSION, + .requires_smc = true, + .device_name = "arm-rsi", + }, }; static bool __init smccc_probe_smccc_device(const struct smccc_device_info *smccc_dev) diff --git a/drivers/virt/coco/arm-cca-guest/Kconfig b/drivers/virt/coco/arm-cca-guest/Kconfig index 2582ebb36922..0d4ce72e2d86 100644 --- a/drivers/virt/coco/arm-cca-guest/Kconfig +++ b/drivers/virt/coco/arm-cca-guest/Kconfig @@ -1,6 +1,7 @@ config ARM_CCA_GUEST tristate "Arm CCA Guest driver" depends on ARM_RMM_RSI + depends on HAVE_ARM_SMCCC_DISCOVERY select TSM_REPORTS help The driver provides userspace interface to request and diff --git a/drivers/virt/coco/arm-cca-guest/main.c b/drivers/virt/coco/arm-cca-guest/main.c index 80659f0885e9..7b1fa008a8f4 100644 --- a/drivers/virt/coco/arm-cca-guest/main.c +++ b/drivers/virt/coco/arm-cca-guest/main.c @@ -4,6 +4,7 @@ */ #include +#include #include #include #include @@ -161,16 +162,7 @@ static const struct tsm_report_ops arm_cca_tsm_report_ops = { .report_new = arm_cca_report_new, }; -/** - * arm_cca_guest_init - Register with the Trusted Security Module (TSM) - * interface. - * - * Return: - * * %0 - Registered successfully with the TSM interface. - * * %-ENODEV - The execution context is not an Arm Realm. - * * %-EBUSY - Already registered. - */ -static int __init arm_cca_guest_init(void) +static int cca_tsm_probe(struct arm_smccc_device *sdev) { int ret; @@ -178,30 +170,32 @@ static int __init arm_cca_guest_init(void) return -ENODEV; ret = tsm_report_register(&arm_cca_tsm_report_ops, NULL); - if (ret < 0) - pr_err("Error %d registering with TSM\n", ret); + if (ret < 0) { + dev_err_probe(&sdev->dev, ret, "Error registering with TSM\n"); + return ret; + } - return ret; + return 0; } -module_init(arm_cca_guest_init); -/** - * arm_cca_guest_exit - unregister with the Trusted Security Module (TSM) - * interface. - */ -static void __exit arm_cca_guest_exit(void) +static void cca_tsm_remove(struct arm_smccc_device *sdev) { tsm_report_unregister(&arm_cca_tsm_report_ops); } -module_exit(arm_cca_guest_exit); -/* modalias, so userspace can autoload this module when RSI is available */ -static const struct platform_device_id arm_cca_match[] __maybe_unused = { - { .name = RSI_PDEV_NAME }, - { } +static const struct arm_smccc_device_id cca_tsm_id_table[] = { + { .func_id = SMC_RSI_ABI_VERSION }, + {} }; +MODULE_DEVICE_TABLE(arm_smccc, cca_tsm_id_table); -MODULE_DEVICE_TABLE(platform, arm_cca_match); +static struct arm_smccc_driver cca_tsm_driver = { + .name = KBUILD_MODNAME, + .probe = cca_tsm_probe, + .remove = cca_tsm_remove, + .id_table = cca_tsm_id_table, +}; +module_arm_smccc_driver(cca_tsm_driver); MODULE_AUTHOR("Sami Mujawar "); MODULE_DESCRIPTION("Arm CCA Guest TSM Driver"); MODULE_LICENSE("GPL"); diff --git a/include/linux/arm-rsi-cmds.h b/include/linux/arm-rsi-cmds.h index 9e8a8c189ca1..3f7a6a833993 100644 --- a/include/linux/arm-rsi-cmds.h +++ b/include/linux/arm-rsi-cmds.h @@ -11,7 +11,6 @@ #include #include -#define RSI_PDEV_NAME "arm-cca-dev" #ifdef CONFIG_ARM_RMM_RSI DECLARE_STATIC_KEY_FALSE(rsi_present); -- 2.43.0