From nobody Sat Feb 14 03:30:50 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 1BF8BCE79A9 for ; Tue, 19 Sep 2023 17:41:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232281AbjISRls (ORCPT ); Tue, 19 Sep 2023 13:41:48 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55100 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232231AbjISRlc (ORCPT ); Tue, 19 Sep 2023 13:41:32 -0400 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 08406A6 for ; Tue, 19 Sep 2023 10:41:26 -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 1CAC41FB; Tue, 19 Sep 2023 10:42:03 -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 C5A583F5A1; Tue, 19 Sep 2023 10:41:24 -0700 (PDT) From: Sudeep Holla Date: Tue, 19 Sep 2023 18:40:54 +0100 Subject: [PATCH RFT v2 06/18] firmware: arm_ffa: Implement the FFA_NOTIFICATION_GET interface MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20230919-ffa_v1-1_notif-v2-6-6f3a3ca3923c@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=2442; i=sudeep.holla@arm.com; h=from:subject:message-id; bh=K2YvsILaFgpr4lZX+pTYFCZTBnlVK2W1JnRsJZazgIA=; b=owEBbAKT/ZANAwAIAQBBurwxfuKYAcsmYgBlCd06QXKkqx4Wz2xxAT7OvoEFG10hO4sIVYO1m jdo2RZiX+SJAjIEAAEIAB0WIQS6ceUSBvMeskPdk+EAQbq8MX7imAUCZQndOgAKCRAAQbq8MX7i mIv9D/ibxw1xn1QD9eCMGeI6hx5YcyE9Rq6Jrrcn/9J+GfmOt1/ZLNNIzpcf4cICA7hwBGZCkdW td9eOsMYwiYiBR7lnJEKsPpPRMu38uTXQmOOBp5wUR7ap6NYOrV2L1Haik2ip2rjrDEZ1wiYKOf FS7P0661KKQJLrJyFnTqisEjL661m7cNVynYDxZBkjQychPMhfjrDu2dhbrSpgFN0BeiGQCepjL vYzRqwVeJacXpCeCLxe589xpQdV2+CNtJj/lLIkFHl9/XfqmPve7BBl+nNBonwcXaqaKU4FGt2q ETRf1UtD2lcsCfsGmixptpg55Jrkwysxl6zpFVBJwPfOd2vkmeHNwk6yvjeAExKYPQU1SBDFWK/ 1dv49RA/ryCZe7tNDF9ctSNTAWyO4tZ6N41TqUwsiyHsZVG8B+1YxV0FkO5V5Ic5ctrQ49dFWFL lpLTcjQtdT2F89djZsac2yU6fUrfZ1s+sUIUIJCdfGLzmhywVByVLkb31bUGuitj7YLFkQeNWTL Q25HUnvee5R28bkWi/miPN92q69Q8LR+YMW1z+8OT71Zdc9OAcbaKyAAN4YsdwpeW/P++opehLN nUJ42SioPPwCrxPQ7zYQYI4t4hTBsvSMSZzzuhOL3tCFFUhw/JE5mvD7FTg9TsuVw6Bv5PndhXw tkaTJzarr4Gd5 X-Developer-Key: i=sudeep.holla@arm.com; a=openpgp; fpr=7360A21742ADF5A11767C1C139CFD4755FE2D5B4 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The framework provides an interface to the receiver to determine the identity of the notification. A receiver endpoint must use the FFA_NOTIFICATION_GET interface to retrieve its pending notifications and handle them. Add the support for FFA_NOTIFICATION_GET to allow the caller(receiver) to fetch its pending notifications from other partitions in the system. Signed-off-by: Sudeep Holla --- drivers/firmware/arm_ffa/driver.c | 37 +++++++++++++++++++++++++++++++++++= ++ 1 file changed, 37 insertions(+) diff --git a/drivers/firmware/arm_ffa/driver.c b/drivers/firmware/arm_ffa/d= river.c index 2aae838ba46a..acb58715687c 100644 --- a/drivers/firmware/arm_ffa/driver.c +++ b/drivers/firmware/arm_ffa/driver.c @@ -581,6 +581,14 @@ static int ffa_notification_bitmap_destroy(void) ((u32)(FIELD_GET(NOTIFICATION_HIGH_MASK, (x)))) #define NOTIFICATION_BITMAP_LOW(x) \ ((u32)(FIELD_GET(NOTIFICATION_LOW_MASK, (x)))) +#define PACK_NOTIFICATION_BITMAP(low, high) \ + (FIELD_PREP(NOTIFICATION_LOW_MASK, (low)) | \ + FIELD_PREP(NOTIFICATION_HIGH_MASK, (high))) + +#define RECEIVER_VCPU_MASK GENMASK(31, 16) +#define PACK_NOTIFICATION_GET_RECEIVER_INFO(vcpu_r, r) \ + (FIELD_PREP(RECEIVER_VCPU_MASK, (vcpu_r)) | \ + FIELD_PREP(RECEIVER_ID_MASK, (r))) =20 static int ffa_notification_bind_common(u16 dst_id, u64 bitmap, u32 flags, bool is_bind) @@ -624,6 +632,35 @@ int ffa_notification_set(u16 src_id, u16 dst_id, u32 f= lags, u64 bitmap) return 0; } =20 +struct ffa_notify_bitmaps { + u64 sp_map; + u64 vm_map; + u64 arch_map; +}; + +static int ffa_notification_get(u32 flags, struct ffa_notify_bitmaps *noti= fy) +{ + ffa_value_t ret; + u16 src_id =3D drv_info->vm_id; + u16 cpu_id =3D smp_processor_id(); + u32 rec_vcpu_ids =3D PACK_NOTIFICATION_GET_RECEIVER_INFO(cpu_id, src_id); + + invoke_ffa_fn((ffa_value_t){ + .a0 =3D FFA_NOTIFICATION_GET, .a1 =3D rec_vcpu_ids, .a2 =3D flags, + }, &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; /* Something else went wrong. */ + + notify->sp_map =3D PACK_NOTIFICATION_BITMAP(ret.a2, ret.a3); + notify->vm_map =3D PACK_NOTIFICATION_BITMAP(ret.a4, ret.a5); + notify->arch_map =3D PACK_NOTIFICATION_BITMAP(ret.a6, ret.a7); + + return 0; +} + static int ffa_run(struct ffa_device *dev, u16 vcpu) { ffa_value_t ret; --=20 2.42.0