From nobody Thu Jan 1 10:41:41 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 5DA04C07545 for ; Tue, 24 Oct 2023 10:56:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231804AbjJXK4k (ORCPT ); Tue, 24 Oct 2023 06:56:40 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50964 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232057AbjJXK4c (ORCPT ); Tue, 24 Oct 2023 06:56:32 -0400 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 209EC109 for ; Tue, 24 Oct 2023 03:56:30 -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 D4BD715A1; Tue, 24 Oct 2023 03:57:10 -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 1357F3F64C; Tue, 24 Oct 2023 03:56:28 -0700 (PDT) From: Sudeep Holla Date: Tue, 24 Oct 2023 11:56:19 +0100 Subject: [PATCH 3/4] firmware: arm_ffa: Add checks for the notification enabled state MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20231024-ffa-notification-fixes-v1-3-d552c0ec260d@arm.com> References: <20231024-ffa-notification-fixes-v1-0-d552c0ec260d@arm.com> In-Reply-To: <20231024-ffa-notification-fixes-v1-0-d552c0ec260d@arm.com> To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Cc: Sudeep Holla , Jens Wiklander , Coboy Chen , Lorenzo Pieralisi X-Mailer: b4 0.12.4 X-Developer-Signature: v=1; a=openpgp-sha256; l=2821; i=sudeep.holla@arm.com; h=from:subject:message-id; bh=E6NSv6v1x1k9jYmSXi9wqAwct9jHzDEtdSLjqJZKdeA=; b=owEBbQKS/ZANAwAIAQBBurwxfuKYAcsmYgBlN6LZlekawWTp6pU0+zIL+ooCxPn686rd+ILSC Hhq+w8T2puJAjMEAAEIAB0WIQS6ceUSBvMeskPdk+EAQbq8MX7imAUCZTei2QAKCRAAQbq8MX7i mCbFD/9dxq64fStRXBbNV9s6lwBsfxZTteMfOZvLHCLYjvzHUn33Gf2sGL5fml/7Ren7MF8mPvA ZGnOLK9do+ElMIsJ569kWwjpP5edeBS5R+Qs2ckeDQrsMYHEny5Kmn54yEkJLygzho4l8CzdpeA 6jI3WO+oNy8U13h7T3IJfmshizFhogR/+Tcl2OTEKMfVeQJKi4gBmA6BJRYGDHCcB3dTfs4Fkup Dnkuk74tbWojm5lL+l6wcxBIWZwc2R3BfAii9yUC+RSUHl1dNG643KBsKpMAOiHk9Nws1OWZboI u6X7lOacF8sfC0kDOjlpO/MuK57WHfYm7je5/8l0aI1BNQ/gOaN0u834vq3u4t8BzjwUjKzst1u 1KznUD0V96WwUOA1uBn8e669hV+hMLDr2YbmEDxNKC1HfhplKzaG6M7K7RfX7/I5paZU40z7eaf LIoNAejPcbfDGJptk+bt2mf7eLm2n2gcZ/T3nrlCJsfodT9KuiceYAaj99Pd0ta9vIQYxfXsnjc EypyLPkGa7r3Qd3yico3Y5sz6fdKOU8Hze1GYzWWzSJTIvKa81z1kCvD+VDuNBvwRQysRTVGfI0 8UKIHK9s/sASvLpEvKDrGHnCUcf7CyFSaV/aC1aHPdOVwQulkcXCsfciV3WN0KAe9eIVut9fQlh 1p49MAylzEvosjg== X-Developer-Key: i=sudeep.holla@arm.com; a=openpgp; fpr=7360A21742ADF5A11767C1C139CFD4755FE2D5B4 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org We need to check if the FF-A notifications are enabled or not in all the notification operations that are accessible for the FF-A device from the FF-A driver. This helps to avoid making calls to the FF-A firmware even if the notification setup has failed. Signed-off-by: Sudeep Holla --- drivers/firmware/arm_ffa/driver.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/drivers/firmware/arm_ffa/driver.c b/drivers/firmware/arm_ffa/d= river.c index 0ab30b571a69..b097452597a2 100644 --- a/drivers/firmware/arm_ffa/driver.c +++ b/drivers/firmware/arm_ffa/driver.c @@ -99,6 +99,7 @@ struct ffa_drv_info { void *tx_buffer; bool mem_ops_native; bool bitmap_created; + bool notif_enabled; unsigned int sched_recv_irq; unsigned int cpuhp_state; struct ffa_pcpu_irq __percpu *irq_pcpu; @@ -889,6 +890,8 @@ static int ffa_memory_lend(struct ffa_mem_ops_args *arg= s) =20 #define FFA_SECURE_PARTITION_ID_FLAG BIT(15) =20 +#define ffa_notifications_disabled() (!drv_info->notif_enabled) + enum notify_type { NON_SECURE_VM, SECURE_PARTITION, @@ -908,6 +911,9 @@ static int ffa_sched_recv_cb_update(u16 part_id, ffa_sc= hed_recv_cb callback, struct ffa_dev_part_info *partition; bool cb_valid; =20 + if (ffa_notifications_disabled()) + return -EOPNOTSUPP; + partition =3D xa_load(&drv_info->partition_info, part_id); write_lock(&partition->rw_lock); =20 @@ -1001,6 +1007,9 @@ static int ffa_notify_relinquish(struct ffa_device *d= ev, int notify_id) int rc; enum notify_type type =3D ffa_notify_type_get(dev->vm_id); =20 + if (ffa_notifications_disabled()) + return -EOPNOTSUPP; + if (notify_id >=3D FFA_MAX_NOTIFICATIONS) return -EINVAL; =20 @@ -1027,6 +1036,9 @@ static int ffa_notify_request(struct ffa_device *dev,= bool is_per_vcpu, u32 flags =3D 0; enum notify_type type =3D ffa_notify_type_get(dev->vm_id); =20 + if (ffa_notifications_disabled()) + return -EOPNOTSUPP; + if (notify_id >=3D FFA_MAX_NOTIFICATIONS) return -EINVAL; =20 @@ -1057,6 +1069,9 @@ static int ffa_notify_send(struct ffa_device *dev, in= t notify_id, { u32 flags =3D 0; =20 + if (ffa_notifications_disabled()) + return -EOPNOTSUPP; + if (is_per_vcpu) flags |=3D (PER_VCPU_NOTIFICATION_FLAG | vcpu << 16); =20 @@ -1388,6 +1403,7 @@ static void ffa_notifications_cleanup(void) ffa_notification_bitmap_destroy(); drv_info->bitmap_created =3D false; } + drv_info->notif_enabled =3D false; } =20 static void ffa_notifications_setup(void) @@ -1422,6 +1438,7 @@ static void ffa_notifications_setup(void) hash_init(drv_info->notifier_hash); mutex_init(&drv_info->notify_lock); =20 + drv_info->notif_enabled =3D true; return; cleanup: pr_info("Notification setup failed %d, not enabled\n", ret); --=20 2.42.0