From nobody Mon Apr 6 21:53:56 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A80E4C38145 for ; Fri, 2 Sep 2022 13:14:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238560AbiIBNOH (ORCPT ); Fri, 2 Sep 2022 09:14:07 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54674 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236278AbiIBNNV (ORCPT ); Fri, 2 Sep 2022 09:13:21 -0400 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 7AE71A8CE8 for ; Fri, 2 Sep 2022 05:50:37 -0700 (PDT) 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 9EF5A152B; Fri, 2 Sep 2022 05:40:54 -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 233353F766; Fri, 2 Sep 2022 05:40:47 -0700 (PDT) From: Sudeep Holla To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, op-tee@lists.trustedfirmware.org Cc: Sudeep Holla , Marc Bonnici , Achin Gupta , Jens Wiklander , Valentin Laurent , Lukas Hanel , Coboy Chen Subject: [PATCH v2 04/10] firmware: arm_ffa: Add support for querying FF-A features Date: Fri, 2 Sep 2022 13:40:26 +0100 Message-Id: <20220902124032.788488-5-sudeep.holla@arm.com> X-Mailer: git-send-email 2.37.3 In-Reply-To: <20220902124032.788488-1-sudeep.holla@arm.com> References: <20220902124032.788488-1-sudeep.holla@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Add support for FFA_FEATURES to discover properties supported at the FF-A interface. This interface can be used to query: - If an FF-A interface is implemented by the component at the higher EL, - If an implemented FF-A interface also implements any optional features described in its interface definition, and - Any implementation details exported by an implemented FF-A interface as described in its interface definition. Signed-off-by: Sudeep Holla Reviewed-by: Jens Wiklander --- drivers/firmware/arm_ffa/driver.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/drivers/firmware/arm_ffa/driver.c b/drivers/firmware/arm_ffa/d= river.c index 04e7cbb1b9aa..81b8d578b6ea 100644 --- a/drivers/firmware/arm_ffa/driver.c +++ b/drivers/firmware/arm_ffa/driver.c @@ -571,6 +571,32 @@ static int ffa_memory_reclaim(u64 g_handle, u32 flags) return 0; } =20 +static int ffa_features(u32 func_feat_id, u32 input_props, + u32 *if_props_1, u32 *if_props_2) +{ + ffa_value_t id; + + if (!ARM_SMCCC_IS_FAST_CALL(func_feat_id) && input_props) { + pr_err("%s: Invalid Parameters: %x, %x", __func__, + func_feat_id, input_props); + return ffa_to_linux_errno(FFA_RET_INVALID_PARAMETERS); + } + + invoke_ffa_fn((ffa_value_t){ + .a0 =3D FFA_FEATURES, .a1 =3D func_feat_id, .a2 =3D input_props, + }, &id); + + if (id.a0 =3D=3D FFA_ERROR) + return ffa_to_linux_errno((int)id.a2); + + if (if_props_1) + *if_props_1 =3D id.a2; + if (if_props_2) + *if_props_2 =3D id.a3; + + return 0; +} + static u32 ffa_api_version_get(void) { return drv_info->version; --=20 2.37.3