From nobody Fri Dec 19 09:45:05 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 8315EE92736 for ; Thu, 5 Oct 2023 16:05:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235961AbjJEQFE (ORCPT ); Thu, 5 Oct 2023 12:05:04 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34536 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234733AbjJEQDY (ORCPT ); Thu, 5 Oct 2023 12:03:24 -0400 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id D11C03869 for ; Thu, 5 Oct 2023 07:45:12 -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 23273150C; Thu, 5 Oct 2023 07:45:51 -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 6D3DD3F641; Thu, 5 Oct 2023 07:45:11 -0700 (PDT) From: Sudeep Holla Date: Thu, 05 Oct 2023 15:44:56 +0100 Subject: [PATCH v4 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: <20231005-ffa_v1-1_notif-v4-3-cddd3237809c@arm.com> References: <20231005-ffa_v1-1_notif-v4-0-cddd3237809c@arm.com> In-Reply-To: <20231005-ffa_v1-1_notif-v4-0-cddd3237809c@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=tCh7LbKeNAevFd5uQSx03qEkiVl/aQEeXvD/r/UF4UU=; b=owEBbQKS/ZANAwAIAQBBurwxfuKYAcsmYgBlHsvwFDa1dLaZiLdaBoo+tK3/uFpNRlVXwQfJU v79YnQB7lKJAjMEAAEIAB0WIQS6ceUSBvMeskPdk+EAQbq8MX7imAUCZR7L8AAKCRAAQbq8MX7i mLWQD/wLXEyJRAXmNV7481V9rRrEOHvJ36UfKSIWMkvKASOA5tN91M1Orlf6679gmfJJDBvv8SP X8CpzgeqIgLndGOcvlgUc6sKgXdT2QHLzGMqSlp1zh6NNBzuH0CCY9YjZ+CGIHBB+vWPPL47OQR VcuIKfuU9VXpea+xynjlRpwkoqgjz/YGTSL19m3GOfUW6GSzopPt0aAVibxZK7PQBGRnqYbKMcO NkgOexysE6f9G4lhGDOJfhErVsR4D3jNpMh5UZfLxCi1Jd7Ehjxo8qT2SmQQ9Kf79rwsRbGakpv j/sU7v5lEMsDfKRyJPc9QT+mGcVv4FpPNySXQDWLWk35gS7Vk1hZxkkocYP1z/6HYsJMkhCSsyJ 4mGhqnGr9KiRwMhuUNBBi4vJjI4tXqCP+QahymeH4WfnlAt4P70SMXy4TTadgIPeoloJYQQa298 TG0iIjeHhIsvuVombabM1TmrG5EGsfhwomwXxhzl6KAojYWradn5YXCbOWOfoTJXeueuxfvASH6 p/YqWegmTZ7RtKxys24QRT1RvxOnCj5phnY8nqFHrkicnZL8uiHewpV4UN6yNvPdSdEwEIP96mC jXGiYEKjH2d9OYaTf779pGMbGf6ha1eNRMyOeoa/Vq6iilHIcNcBSoqvxabFOqVMo9FFGz2/BYJ eN6H/Li3w/s+KLw== 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 c2ab6f4cf296..20f8f4ca8e89 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