From mboxrd@z Thu Jan 1 00:00:00 1970 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 92EAFCC6B38 for ; Fri, 16 Oct 2026 16:24:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=9qidRa2FBgCR2y0sBJPJyGy5f82k6s8UrQ9M/kGZ7II=; b=o6lWGSh+PohWEDRmf6jO0dLaof URfVxyAhfCZDPKJaxhYeSRLyzCl72AS+9iuFBeA9N+uvAfz3Wft6bQO/rYEzxYNr2NliNM5S5HoNU j7VpqoR2DllqaUsMQR/+14KY9Qs4XJFFeKLBnPp1A5Pqgyt4SyrLIeHtcKu13tjy6Jnd66orc4VmL Rnt/Zo0/BB0Ow5qTmvkpZIploqL+JGW3DpkBTR+XEFkTjlNEuhQG1BFAoqmHMUzt63Kn/eCwwtnOm H1BZ4S93NdkZWBygwdx54rRmfyGjjgKNPasGM9LKOPcDUmZcp7EKlxVLATPKSSpyJ9SRDBzocgi5T P+4dTFAQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1xHkj2-00000003Q6J-14G0; Fri, 16 Oct 2026 16:24:08 +0000 Received: from desiato.infradead.org ([2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1xHkj1-00000003Q6D-0Bfr for linux-arm-kernel@bombadil.infradead.org; Fri, 16 Oct 2026 16:24:07 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=9qidRa2FBgCR2y0sBJPJyGy5f82k6s8UrQ9M/kGZ7II=; b=kG5O99WWx57bXaQoe8GXAjlUHc 72OqcLqM0sb1J7jxYTUDhvOp/q5rhKXd/TDxxD/K9LKhsVGK7sghSfDchwMTcUbaEzalE77OWZpBn 4RiIZ0Hf6yM284cuCbQA5DcjIdyzuwgu4P+azlhZ7H815Hld8UZtOlR4oG+Cwk3lZy2PCz4qlSkiZ TZnHITeuQzg++SKwnyVCBt74U35WBzAl6qqYPgj8TJkT863Q/4Ri0KIM/zWhP4uee0LfQ5Z77SYh6 lMsBqP+h1OCuv4eqm26oPFd8wsIVqNy/ghkoXfVMwXChaGry34lt6iZBJ29Al6NDy9X50BtJ40F5J Z2rg7wvw==; Received: from galois.linutronix.de ([2a0a:51c0:0:12e:550::1]) by desiato.infradead.org with esmtps (Exim 4.99.5 #2 (Red Hat Linux)) id 1xHkix-00000001jEL-3Prr for linux-arm-kernel@lists.infradead.org; Fri, 16 Oct 2026 16:24:05 +0000 Date: Fri, 16 Oct 2026 18:23:56 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1792167838; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=9qidRa2FBgCR2y0sBJPJyGy5f82k6s8UrQ9M/kGZ7II=; b=DKozTNJEW2AwvZQuAgQg2+mTJJGqe+kkw/MO1d4Yqtn+W9a/xKdX3KFkLlnxMvjL2+pQg8 dbyE11B6RrL1FCd2fRh4+97Ce5LXbqRmzoasHYW1ZD11taY+6lc56+dnqdpvZCHvu58aMK LcdH6V8qt8R9XEBaTR7+jhsH4xa26S/l2heU/8P1OiKbMUsMFmJVj3TBbjBpMU0i45hY+J i62t/yY5DOV9iYt265DWMnjMwGlPVrY0xgLrB6lVpB2w8STHezLO8cFe4y7qQrxvI63BvL 0+G3pQaRkxI2+I5D2BubbY8CohV3UtJbdWjwKtnR6ZsE4h6V4Pa9mGZI02mPOw== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1792167838; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=9qidRa2FBgCR2y0sBJPJyGy5f82k6s8UrQ9M/kGZ7II=; b=qYj/q64n/vggtFXpYq0P7zeGT3FC4Vf5ih14OTPFnqEExbJEnVjqq8Ol4VxNbQt+7y26aT 89OYe8ZEwBZ4vgCw== From: Sebastian Andrzej Siewior To: tanmay.shah@amd.com Cc: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Jassi Brar , Michal Simek , Harini T , Saeed Nowshadi Subject: Re: [Q] zynqmp-ipi-mailbox and SGI interrupts Message-ID: <20261016162356.m2X9jbCa@linutronix.de> References: <20261015083937.8SDbdK8P@linutronix.de> <1ee3f542-e0b2-41d4-bf6a-b103dabf50cd@amd.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <1ee3f542-e0b2-41d4-bf6a-b103dabf50cd@amd.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20261016_172403_959871_8CA09ECA X-CRM114-Status: GOOD ( 15.46 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 2026-10-16 11:10:29 [-0500], Shah, Tanmay wrote: > Hello, Hello, > Thank you for your email, please find my response below: Thank you for your email, too. > > So is this SGI-IPI a thing or not? > > > > Yes it is. Ideally, TF-A and Linux can share the IPI. If the IPI > interrupt is used by the TF-A and the expectation is that Linux mailbox > work on the same IPI (because all other IPIs are busy) then the work > around is, TF-A will generate SGI for the linux mbox driver, and the > mbox driver will use that SGI via device-tree. > > It is a vendor specific use case. So the dt-node for this use case, may > not be available in the usptream kernel, but can be enabled if correct > SGI is configured via the device-tree. And it has to be a per-CPU interrupt? It can't become a regular interrupt which is not per-CPU? Does the driver at some point access per-CPU registers? > Thank you, > Tanmay > Sebastian