From patchwork Fri May 21 15:10:31 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sudeep Holla X-Patchwork-Id: 12273279 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-17.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 78709C47076 for ; Fri, 21 May 2021 15:31:01 +0000 (UTC) Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 04E176135B for ; Fri, 21 May 2021 15:31:00 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 04E176135B Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=desiato.20200630; h=Sender:Content-Transfer-Encoding :Content-Type:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To:Message-Id:Date: Subject:Cc:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=q3tIgMGldJRxRvfnrmwpcPVuNGQHanb/kvfKD/bnBAg=; b=MV0j5bjuhDITyQsyBFMJsZcFcH sd0ZTBMjMI5yUf1Z8xdH/+eAx0dF7rfIMW3/lLe9lgqRES7W44ffMfXIUrf3QrxeUh/p7PQXm88xe 8ItaKGh45br4FcOTTH++pouotY2M/82SB2EnxrKR31gk2rAsBtUEXIuSiezXbOD7sbL4oAVVPTD5O YgL9f1e/ITRDK0CCvqnST/nX4nB+KRmYPuHMDBniV4g2ldsE6KdKOP8CAWcOn3ZK8VR+IqQ8QqDIM AyezzOUvNUzJnbXZd8V+CK+9bPt9phntsMdI0ikjaU4IjVDN285tBTLVpLymAhGDYX3F/whs8NN7C pn5o3u1A==; Received: from localhost ([::1] helo=desiato.infradead.org) by desiato.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1lk75R-0002Iq-Sd; Fri, 21 May 2021 15:29:18 +0000 Received: from bombadil.infradead.org ([2607:7c80:54:e::133]) by desiato.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1lk72r-0001OK-5Y for linux-arm-kernel@desiato.infradead.org; Fri, 21 May 2021 15:26:37 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description; bh=V38TsNxL0IxrCfeSkSPbu3/V8MnLdyj0kbXpMlTNVps=; b=atqGQhV5/WXN/35UTd/Y7e4hlB N3NjeuL2BWgKoVt4qkXTt5xe9+ona/O1ngKq0JyonXr1vzYQbM15SrFRky8TEHWLMeVjfNxh9oCUv XG7n6buPGhHLFKWdM1HDXo5abRjrhXNWs6dGMaxst2gbHj30aqQxg/FfTpNORbVttvI/CC9iMN5AU pBszQhcCzRAu4E99EoV8ln5r3SSkAvygyczANxmX9DyGFo0ft2gCEyzuuPWlySMBNkwDTQvfvx9Rv Yjji9aSmjlUoBJriAuP1PY3rYx6XarLPtGso0+RcLt6yRCJ+qWzP34BFUp8CSuUPoqBToHd1LoUl7 mSjktQkA==; Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.94 #2 (Red Hat Linux)) id 1lk6ne-00HDkJ-HT for linux-arm-kernel@lists.infradead.org; Fri, 21 May 2021 15:10:56 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id C65691515; Fri, 21 May 2021 08:10:49 -0700 (PDT) Received: from usa.arm.com (e103737-lin.cambridge.arm.com [10.1.197.49]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 9042C3F73B; Fri, 21 May 2021 08:10:48 -0700 (PDT) From: Sudeep Holla To: linux-arm-kernel@lists.infradead.org Cc: Sudeep Holla , arve@google.com, Andrew Walbran , David Hartley , Achin Gupta , Jens Wiklander , Arunachalam Ganapathy , Marc Bonnici Subject: [PATCH v7 3/5] firmware: arm_ffa: Add support for SMCCC as transport to FFA driver Date: Fri, 21 May 2021 16:10:31 +0100 Message-Id: <20210521151033.181846-4-sudeep.holla@arm.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210521151033.181846-1-sudeep.holla@arm.com> References: <20210521151033.181846-1-sudeep.holla@arm.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210521_081054_691730_03799629 X-CRM114-Status: GOOD ( 16.21 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org There are requests to keep the transport separate in order to allow other possible transports like virtio. So let us keep the SMCCC transport specific routines abstracted. It is kept simple for now. Once we add another transport, we can develop better abstraction. Reviewed-by: Jens Wiklander Tested-by: Jens Wiklander Signed-off-by: Sudeep Holla --- drivers/firmware/arm_ffa/Kconfig | 5 ++++ drivers/firmware/arm_ffa/Makefile | 3 ++- drivers/firmware/arm_ffa/common.h | 4 ++++ drivers/firmware/arm_ffa/smccc.c | 39 +++++++++++++++++++++++++++++++ 4 files changed, 50 insertions(+), 1 deletion(-) create mode 100644 drivers/firmware/arm_ffa/smccc.c diff --git a/drivers/firmware/arm_ffa/Kconfig b/drivers/firmware/arm_ffa/Kconfig index 261a3660650a..5e3ae5cf82e8 100644 --- a/drivers/firmware/arm_ffa/Kconfig +++ b/drivers/firmware/arm_ffa/Kconfig @@ -14,3 +14,8 @@ config ARM_FFA_TRANSPORT This driver provides interface for all the client drivers making use of the features offered by ARM FF-A. + +config ARM_FFA_SMCCC + bool + default ARM_FFA_TRANSPORT + depends on ARM64 && HAVE_ARM_SMCCC_DISCOVERY diff --git a/drivers/firmware/arm_ffa/Makefile b/drivers/firmware/arm_ffa/Makefile index 82d0d35c5324..9d9f37523200 100644 --- a/drivers/firmware/arm_ffa/Makefile +++ b/drivers/firmware/arm_ffa/Makefile @@ -1,5 +1,6 @@ # SPDX-License-Identifier: GPL-2.0-only ffa-bus-y = bus.o ffa-driver-y = driver.o -ffa-module-objs := $(ffa-bus-y) $(ffa-driver-y) +ffa-transport-$(CONFIG_ARM_FFA_SMCCC) += smccc.o +ffa-module-objs := $(ffa-bus-y) $(ffa-driver-y) $(ffa-transport-y) obj-$(CONFIG_ARM_FFA_TRANSPORT) = ffa-module.o diff --git a/drivers/firmware/arm_ffa/common.h b/drivers/firmware/arm_ffa/common.h index 2d3a32f67d5d..f24754a59f47 100644 --- a/drivers/firmware/arm_ffa/common.h +++ b/drivers/firmware/arm_ffa/common.h @@ -16,9 +16,13 @@ typedef void (ffa_fn)(ffa_value_t, ffa_value_t *); int arm_ffa_bus_init(void); void arm_ffa_bus_exit(void); +#ifdef CONFIG_ARM_FFA_SMCCC +int __init ffa_transport_init(ffa_fn **invoke_ffa_fn); +#else static inline int __init ffa_transport_init(ffa_fn **invoke_ffa_fn) { return -EOPNOTSUPP; } +#endif #endif /* _FFA_COMMON_H */ diff --git a/drivers/firmware/arm_ffa/smccc.c b/drivers/firmware/arm_ffa/smccc.c new file mode 100644 index 000000000000..4d85bfff0a4e --- /dev/null +++ b/drivers/firmware/arm_ffa/smccc.c @@ -0,0 +1,39 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2021 ARM Ltd. + */ + +#include + +#include "common.h" + +static void __arm_ffa_fn_smc(ffa_value_t args, ffa_value_t *res) +{ + arm_smccc_1_2_smc(&args, res); +} + +static void __arm_ffa_fn_hvc(ffa_value_t args, ffa_value_t *res) +{ + arm_smccc_1_2_hvc(&args, res); +} + +int __init ffa_transport_init(ffa_fn **invoke_ffa_fn) +{ + enum arm_smccc_conduit conduit; + + if (arm_smccc_get_version() < ARM_SMCCC_VERSION_1_2) + return -EOPNOTSUPP; + + conduit = arm_smccc_1_1_get_conduit(); + if (conduit == SMCCC_CONDUIT_NONE) { + pr_err("%s: invalid SMCCC conduit\n", __func__); + return -EOPNOTSUPP; + } + + if (conduit == SMCCC_CONDUIT_SMC) + *invoke_ffa_fn = __arm_ffa_fn_smc; + else + *invoke_ffa_fn = __arm_ffa_fn_hvc; + + return 0; +}