From nobody Fri Dec 19 08:06:31 2025 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 D929FE71D45 for ; Fri, 29 Sep 2023 15:03:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233420AbjI2PD1 (ORCPT ); Fri, 29 Sep 2023 11:03:27 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44816 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233314AbjI2PDU (ORCPT ); Fri, 29 Sep 2023 11:03:20 -0400 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 8AB141AE for ; Fri, 29 Sep 2023 08:03:18 -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 A80311063; Fri, 29 Sep 2023 08:03:56 -0700 (PDT) Received: from e103737-lin.cambridge.arm.com (e103737-lin.cambridge.arm.com [10.1.197.49]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 4F9973F5A1; Fri, 29 Sep 2023 08:03:17 -0700 (PDT) From: Sudeep Holla Date: Fri, 29 Sep 2023 16:02:52 +0100 Subject: [PATCH v3 03/17] firmware: arm_ffa: Implement the notification bind and unbind interface MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20230929-ffa_v1-1_notif-v3-3-c8e4f15190c8@arm.com> References: <20230929-ffa_v1-1_notif-v3-0-c8e4f15190c8@arm.com> In-Reply-To: <20230929-ffa_v1-1_notif-v3-0-c8e4f15190c8@arm.com> To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Sudeep Holla , Marc Bonnici , Jens Wiklander , Coboy Chen , Lorenzo Pieralisi , Olivier Deprez X-Mailer: b4 0.12.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=2207; i=sudeep.holla@arm.com; h=from:subject:message-id; bh=6dM7t7UcezChOGHUwYllL2LxWCmWJi8qtz0lRrVzNQ8=; b=owEBbQKS/ZANAwAIAQBBurwxfuKYAcsmYgBlFucuri2NvMBd2IjxYNO/D03XgYBmvOLA9YjLc idNzqIiTE+JAjMEAAEIAB0WIQS6ceUSBvMeskPdk+EAQbq8MX7imAUCZRbnLgAKCRAAQbq8MX7i mNOuD/4+jcPMdjdx5iTpJDFKJIU+T08pss3uCcdy0GEF9cddo335kSH2rAbXlNk4XHH150kw9K6 NInTCOWpnCVvD+Wk6I7pKYDd/tzKh1KVjCDpRtRLx7g1B8ihjnxthRTCrPfW59G3VnS/QSV9KJG GlGLfx9VBDIazIYaHrHEkvvKEla+rLU/MkLR8tsFSFssXmpA/GflTEHkhO0oqLgst4InUYFW7Rw aTBrbwjOWCFmuqr7xV8IaoLNaNAzZV6bh1pFziLwX+yLxZCUBQV/zo/ptQGaVLTj110JE6GCv/h +QUPZrnjOClVOffWhXtHa1mwQ7a0Pt+sMymCaSszK4xddfnOuHwm0/DavXf2qMHMiovdQYf5yro K7NqxivFAX+2WLsp4vLXyqXhIlq71OuQrVlxv5NVzrw3tgAGJQPxmKV4i1pqrq3QII8mDYYHLj3 a/nDOfABp7AhYVGZBAUQq5njecxdmJl+k3V2W1jAS5+TahyPrgEQG+U/aJVQf2h6YXnFaEig7Ar zFLcB4iIldYmZT6ZY4bLawjD5CKPEsbKa7ya9kYh8EM/4oU9WsCMawjgAgO9EL4i6j7pRRj5aAR NXnyPYf3dTdYpQTGzZxstOj6dAf/08kehdTyFTkQM80QG4peBrh9Azl8ldq6hTjmO4joZS7G0Ig qiCKLrfOcFW9VFQ== X-Developer-Key: i=sudeep.holla@arm.com; a=openpgp; fpr=7360A21742ADF5A11767C1C139CFD4755FE2D5B4 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org A receiver endpoint must bind a notification to any sender endpoint before the latter can signal the notification to the former. The receiver assigns one or more doorbells to a specific sender. Only the sender can ring these doorbells. A receiver uses the FFA_NOTIFICATION_BIND interface to bind one or more notifications to the sender. A receiver un-binds a notification from a sender endpoint to stop the notification from being signaled. It uses the FFA_NOTIFICATION_UNBIND interface to do this. Allow the FF-A driver to be able to bind and unbind a given notification ID to a specific partition ID. This will be used to register and unregister notification callbacks from the FF-A client drivers. Signed-off-by: Sudeep Holla --- drivers/firmware/arm_ffa/driver.c | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) diff --git a/drivers/firmware/arm_ffa/driver.c b/drivers/firmware/arm_ffa/d= river.c index efa4e7fb15e3..26bf9c4e3b5f 100644 --- a/drivers/firmware/arm_ffa/driver.c +++ b/drivers/firmware/arm_ffa/driver.c @@ -587,6 +587,35 @@ static int ffa_notification_bitmap_destroy(void) return 0; } =20 +#define NOTIFICATION_LOW_MASK GENMASK(31, 0) +#define NOTIFICATION_HIGH_MASK GENMASK(63, 32) +#define NOTIFICATION_BITMAP_HIGH(x) \ + ((u32)(FIELD_GET(NOTIFICATION_HIGH_MASK, (x)))) +#define NOTIFICATION_BITMAP_LOW(x) \ + ((u32)(FIELD_GET(NOTIFICATION_LOW_MASK, (x)))) + +static int ffa_notification_bind_common(u16 dst_id, u64 bitmap, + u32 flags, bool is_bind) +{ + ffa_value_t ret; + u32 func, src_dst_ids =3D PACK_TARGET_INFO(dst_id, drv_info->vm_id); + + func =3D is_bind ? FFA_NOTIFICATION_BIND : FFA_NOTIFICATION_UNBIND; + + invoke_ffa_fn((ffa_value_t){ + .a0 =3D func, .a1 =3D src_dst_ids, .a2 =3D flags, + .a3 =3D NOTIFICATION_BITMAP_LOW(bitmap), + .a4 =3D NOTIFICATION_BITMAP_HIGH(bitmap), + }, &ret); + + if (ret.a0 =3D=3D FFA_ERROR) + return ffa_to_linux_errno((int)ret.a2); + else if (ret.a0 !=3D FFA_SUCCESS) + return -EINVAL; + + return 0; +} + static void ffa_set_up_mem_ops_native_flag(void) { if (!ffa_features(FFA_FN_NATIVE(MEM_LEND), 0, NULL, NULL) || --=20 2.42.0