From nobody Thu Sep 11 15:04:37 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 AAEC7C04A6A for ; Thu, 3 Aug 2023 19:02:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231926AbjHCTCf (ORCPT ); Thu, 3 Aug 2023 15:02:35 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46582 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230361AbjHCTC1 (ORCPT ); Thu, 3 Aug 2023 15:02:27 -0400 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 184B61713 for ; Thu, 3 Aug 2023 12:02:26 -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 CD5111477; Thu, 3 Aug 2023 12:03:08 -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 B17223F6C4; Thu, 3 Aug 2023 12:02:24 -0700 (PDT) From: Sudeep Holla To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Cc: Sudeep Holla , Jens Wiklander , Lucian Paul-Trifu , Marc Bonnici , Coboy Chen Subject: [PATCH RFT 03/12] firmware: arm_ffa: Implement the notification bind and unbind interface Date: Thu, 3 Aug 2023 20:02:07 +0100 Message-ID: <20230803-ffa_v1-1_notif-v1-3-6613ff2b1f81@arm.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230803-ffa_v1-1_notif-v1-0-6613ff2b1f81@arm.com> References: <20230803-ffa_v1-1_notif-v1-0-6613ff2b1f81@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" 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=3OYEZ9E7vpg3yPFg1J667JzF5mZtHS9nU/hUd6LN5Ks=; b=owEBbQKS/ZANAwAIAQBBurwxfuKYAcsmYgBky/iMR7qOL9Zi5z8RhAxhVfjJVsHMbQnTx3Ufe 4oIltWTY5yJAjMEAAEIAB0WIQS6ceUSBvMeskPdk+EAQbq8MX7imAUCZMv4jAAKCRAAQbq8MX7i mM0jD/9XM2IgcxuAMRlGOA0NjXZYJLOQhVTzf5TLKjbmRV5nA06MK3WxFLrNfdT1gjWqNVSRnni Nc5eASG2Wd4vb8GG9tKcrr3R5/KIuIRXe4VTlX8y8vUpteSeGKdJc9uRq0ZTrZ+xY2iG4tQDNg4 cW8ORBHJ59Aw9K6GYa4nUm6rqo2oMUOqLtY2C037F+fdB4bVUve5abIP0Ztadp/PiRDmzE+RiDY 4hChusP2o+dYakJz9uQPBhnd0MqLw48I/hypdQhEz62FYc/bnhI/TRE0RlwVPFynsRgGFv98m9Q HMOxgJEqE9tW+nXAIn8+Ak75ueajWk2lVTLeTdRIZy/TWhmXMONqxY0OPEIRKK5932viifLPumB uIx6VvwugAnD5m2s5fRObNOxXb7H3b1eMhLBUX/FK9qwltkSON0B39dI7n9mCwvtNPq5KmMZiH+ 3iUp4H0RQfL5PL1Y0kYhv10bYoYZhogcjVoMuXNyzZ9rfqxjeJnO5qKSmNw5P+/Ybl0drjYx1lU kGYpHoP2Gu8Cc9evLhfeZlbthzIxRZ3Mm7cW1i9D084bh2vIAX5O9pJN6thnWwuLTQam5sjr4I9 88PgMAjGkpyfu9tXxApQQV8Oct3Xp3OvisM9Gb52J8zk/CNCOzf7k8x67yYS+48qyViu0OQ0v+N Ko1L7Vlc vChz1UA== X-Developer-Key: i=sudeep.holla@arm.com; a=openpgp; fpr=7360A21742ADF5A11767C1C139CFD4755FE2D5B4 Content-Transfer-Encoding: quoted-printable 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 022c893c9e06..a76e5d3a2422 100644 --- a/drivers/firmware/arm_ffa/driver.c +++ b/drivers/firmware/arm_ffa/driver.c @@ -575,6 +575,35 @@ 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 2.41.0