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 X-Spam-Level: X-Spam-Status: No, score=-5.3 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 68F18C433E0 for ; Mon, 8 Feb 2021 15:52:22 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 02A7864DC4 for ; Mon, 8 Feb 2021 15:52:21 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 02A7864DC4 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=marcan.st Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Type: Content-Transfer-Encoding:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:Date:Message-ID:From: References:To:Subject:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=e6IbVkZJCltSLiEgvFsWcA4or+dUPB7ayFjEScs0iN8=; b=r0o2Sh73XyxiAe9s5lyKaooNp ck0vMcKoxsew+d9AXY3Vse+fjaZOUpJ7X/Wn7iaCR4amKxwMmFOSHQ8ywlSrCacJjqKiR+6I2Lq4Z 1yKeQUxiUrUgsxTqTzKjzwiN+1/rc84PdvT2O7F1AED9wis9+9lT1r3aE163cEFm28d528/M3Jg82 xBI4iQLnmlM4QlbAVA37gKf8Xbd95GC2O+rjeCvgaZL8T2H0ePU5Iy+e1c+lTPVxOWBvafxjiIUg5 g14au41tkSXWLYNTdcW9lMkXBbxBE75U+gv+TPRC+QbeoZqMd5ZNkeOPmeFW31pR6x5qJNBSLFmaJ r6a4tg6CQ==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1l98oo-0004kv-OQ; Mon, 08 Feb 2021 15:51:18 +0000 Received: from marcansoft.com ([212.63.210.85] helo=mail.marcansoft.com) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1l98ol-0004kO-CS for linux-arm-kernel@lists.infradead.org; Mon, 08 Feb 2021 15:51:16 +0000 Received: from [127.0.0.1] (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: marcan@marcan.st) by mail.marcansoft.com (Postfix) with ESMTPSA id DE5D94207F; Mon, 8 Feb 2021 15:51:11 +0000 (UTC) Subject: Re: [PATCH 08/18] arm64: cpufeature: Add a feature for FIQ support To: Marc Zyngier References: <20210204203951.52105-1-marcan@marcan.st> <20210204203951.52105-9-marcan@marcan.st> <87im75l2lp.wl-maz@kernel.org> <87czxalrwc.wl-maz@kernel.org> From: Hector Martin Message-ID: <271fc761-d782-31b8-d97b-907041f15289@marcan.st> Date: Tue, 9 Feb 2021 00:51:09 +0900 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.6.0 MIME-Version: 1.0 In-Reply-To: <87czxalrwc.wl-maz@kernel.org> Content-Language: es-ES X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210208_105115_585910_558AA50F X-CRM114-Status: GOOD ( 13.99 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , List-Id: Cc: Arnd Bergmann , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, soc@kernel.org, robh+dt@kernel.org, Olof Johansson , linux-arm-kernel@lists.infradead.org Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 08/02/2021 20.29, Marc Zyngier wrote: > I'm not sure we want to trust the FW on that particular front (no > offence intended...;-). Hey, I don't even *use* the timers IRQs; if they are unmasked it's iBoot's fault! :-) > That is my current take on this patch. Nothing in the arm64 kernel > expects a FIQ today, so *when* a FIQ fires is pretty much irrelevant, > as long as we handle it properly (panic). Keeping the two bits in sync > is trivial, and shouldn't carry material overhead. Sounds good then, and again that simplifies a ton of stuff. Will go for that in v2. > Aside from the lack of programmable priority, the lack of convenient > masking for per-CPU interrupts is a bit of an issue... Yeah... we'll see how that goes. -- Hector Martin (marcan@marcan.st) Public Key: https://mrcn.st/pub _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel