From nobody Sat Feb 14 03:27:13 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 9BC30CE79A9 for ; Tue, 19 Sep 2023 17:41:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232251AbjISRli (ORCPT ); Tue, 19 Sep 2023 13:41:38 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55036 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232185AbjISRl2 (ORCPT ); Tue, 19 Sep 2023 13:41:28 -0400 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 7DA12C6 for ; Tue, 19 Sep 2023 10:41:22 -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 8DA5E1042; Tue, 19 Sep 2023 10:41:59 -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 422033F5A1; Tue, 19 Sep 2023 10:41:21 -0700 (PDT) From: Sudeep Holla Date: Tue, 19 Sep 2023 18:40:51 +0100 Subject: [PATCH RFT v2 03/18] 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: <20230919-ffa_v1-1_notif-v2-3-6f3a3ca3923c@arm.com> References: <20230919-ffa_v1-1_notif-v2-0-6f3a3ca3923c@arm.com> In-Reply-To: <20230919-ffa_v1-1_notif-v2-0-6f3a3ca3923c@arm.com> To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Sudeep Holla , Jens Wiklander , Marc Bonnici , 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=ET5oJlM5G7gOdj/dFHjwPTU08+J7ULwiBffB/kiZbxY=; b=owEBbQKS/ZANAwAIAQBBurwxfuKYAcsmYgBlCd06hqwaMTYfPjR5qE4M4Yy7h0Ft1HHqLok5k 23GPg9+dH2JAjMEAAEIAB0WIQS6ceUSBvMeskPdk+EAQbq8MX7imAUCZQndOgAKCRAAQbq8MX7i mJ0qD/4tbaCgUPxoghPMR9Kw2eY8cOAR4cve4ySgZIvcsthhY8X+avKefW8wZg+UwbhviQeZ9zM DjuYLnO0t0lgr63EVwa+LENFZQYZDLXyJsZViehXTw2mKTbuN21pWx1FC0u0N2c7WuTziabTzvs To5DEmMTRwWf3HaV9JxL25jHTn11eS7F9kjxT0Fxx7Dv1kt1xdITlTqyHvDh8h3ydauuJSf4jRe EcAV7Ss0uQs1ppFOTCQNq1RN/OUg22duopQQ0cBi+x3Fq5Wj0vm7SAo7XyiIqS51W69JwJ9CnEC AfYX64FXl4SvPFZP8CEL7jJUFMxi+0KjOYn+4SNXgSmUAsSj1wxVPNa2swVpYuLzNJXbZVonVdt aknp6w3RqTCcK4MHQw/RrI5P7LeW4V43MUsAEuaMhxrwfVjwmI2dlXwuTfCMmltQWLzb8bP7N5h pQv5AJyxyEaThIawRKbCoK7N8NYkQiduVNK6BjT2GVWRKiM9JWjdTY7upzDArGfirGm10rJvDhh YecHn6F1XoC+CUzQBvTCDVcPkL6cKIdckCl/VTlUiD+lVds08VG1uZJ8+Bbd94RnqKDwxa9qDdA xUQ/9Vnka8EPOZdUPfEeCROP6zqvEUsNr3LPXn9UnC1dqW2yqkYr8jVID/tO7r+2UnHYD/gD40e UuECNfBYDi9XNbA== 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 5522523afefe..ab67cb22a206 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(drv_info->vm_id, dst_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